World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_11/_homebre.txt

Text File | 1997-02-01 | 1MB | 34,052 lines

The World of Ham Radio CD-ROM



From [e-mail] Fri Nov 08 21:57:55 1996
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From: [e-mail] (Tj Johnston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help! 10 meter linear amplifier...
Date: Fri, 01 Nov 1996 05:19:21 GMT
Organization: Erol's Internet Services
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Am interested in homebrewing a 10 meter Linear Amplifier...

I have investigated converting a 'CB foot warmer' for 10 meters... but
I do not care for the construction style nor the harmonics that these
things create....

Does anyone have a GOOD schematic for a 10 meter linear amp in the
200-300 watt PEP range? Mostly plan to use on SSB but AM/CW capability
would be nice also. 12 volt operation would also be nice since I
travel a lot and would like to run mobile...

I plan to use a old car audo amplifer chasis.... it has an extremely
effecient heat sink on it...

Tj (N4UYQ)



From [e-mail] Fri Nov 08 21:57:55 1996
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From: UN93B <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: test
Date: Thu, 31 Oct 1996 21:28:22 -0800
Organization: Ford Motor Company
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this is a test


From [e-mail] Fri Nov 08 21:57:56 1996
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From: [e-mail] (gudmundur)
Newsgroups: rec.radio.amateur.homebrew
Subject: 8930 needed
Date: 1 Nov 1996 05:34:48 GMT
Organization: silverlake stable
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  Hello,
Looking for 8930 tetrode in good used condition.
Commercial pull prefered. Will be used on 20 mtr band, so ok
if it's vhf capacity is a little down. Would pay $50 for unit
that still has 1 amp of peak current availible at 2kv with 300
vdc on screen. Will use for ssb so peak amps are important to me.
       73 KD3SH

P.S.   have lots of good (like new 4X150A) tetrodes for sale.
glass only, no later version ceramic base.



From [e-mail] Fri Nov 08 21:57:57 1996
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From: Charles Wenzel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Aerial tuner circuit for FM requested
Date: Thu, 31 Oct 1996 22:23:06 -0800
Organization: Real/Time Communications Internet customer posting
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There is a hobbyist FM preamplifier in our technical library at
www.wenzel.com. I don't think you need an antenna tuner as much as you need a
directional antenna. Consider a roof-mounted Yagi FM antenna with a rotator!

[e-mail] wrote:
>
> I am looking perhaps in the wrong place for suggestions on how to build an
> external aerial tuner circuit that would help pull in distant broadcast FM
> stations.
>
> If this is not the best group to send this request to then my apologies, I
> look forward to your suggestions.
>
> Bruce


From [e-mail] Fri Nov 08 21:57:58 1996
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From: Mike <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Removing an Antenna
Date: Thu, 31 Oct 1996 23:41:37 -0800
Organization: Fishnet Internet Services
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Hello Jon, I once removed a cell phone antenna which was attached the
same way. I used acetone being very careful with the run off. Use a very
thin piece of sheet metal to help get "under" the adhesive pad
Good luck
73 Mike K6YPB


From [e-mail] Fri Nov 08 21:57:59 1996
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From: Listserv@ucsd (Mailing List Processor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: your LISTSERV request "help -> motorola mt700"
Date: 1 Nov 96 07:45:06 GMT
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The mailing list "->" could not be found.
You may use the INDEX command to get a listing
of available mailing lists.


From [e-mail] Fri Nov 08 21:58:01 1996
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From: [e-mail] (Lars Moell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Problems making PCBs
Date: Fri, 01 Nov 1996 09:28:16 GMT
Organization: National Defence Research Establishment, Sweden
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I guess I have to try ink-jet printers. Wounder if red is ink is
better than the black?

I use a special UV-light box with 6 tubes and get good results both
with both negative Kodak KPR and positive P20 stuff *IF* the film is
good. Lith-film is of course great but too expensive especially if you
do it on hobby basis

/73 de Lasse SM5GLC
[e-mail] (The2X4) wrote:


>I tried 'em all.
>
>Here is how I do it.
>
>Layout the PCBoard with Harvard Graphics 3.
>Using an HP DeskJet 500C print the layout on a transparency.
>AN HP550C is better because it prints true black.
>Only HP sheets work for me. The Premium kind.
>You now have a very fine detail negative or positive ( I use negative).
>The output menus in HG3 gives you many ways to print
>      once you get the hang of it.
>Coat (I laminate) the board with the resist.
>Shoot the PCBoard thru the negative for 5 minutes with a PE-2 bulb at 12
>inches..
>Use the proper type (POS - NEG) and develope the board
>Etch as hot as you dare! And agitate.
>
>Note: Laminating the resist to the PCBoard eliminates all that messy
>stuff.
>          You get perfect coating at 1.5 mil with the laminate process.
>
>          You don't need a $1000 laminater to do it either.
>          The Ibico units (at Office Depot) work great. (<$250.00)
>
>I get my chemicals and laminate from Kepro. 1-800-325-3878
>
>Carl



From [e-mail] Fri Nov 08 21:58:03 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 1 Nov 1996 04:38:09 -0500
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Hi Dan,

In article <[e-mail]>, DAN <[e-mail]>
writes:

>If my ARRL membership depended on the "cheap shot response" that appeared
as
>a result of
>his (Mr. Measures') provacative article in QST, I would no longer be an
ARRL
>member.
>
>Dan - AD4HW

First: If everyone is patient, I'll go over every bit of this point by
point in detail, and Rich can speak for himself. No one will learn
anything if this becomes a political discussion or an emotional discussion
of personalities.

Second: This should be about how circuits really work, and how accurate,
reasonable, and logical our views are, not about people or groups. If
there are 15 or 20 comments and questions at once in various areas,
nothing will be addressed properly.

Finally:

While I appreciate any support (as I'm sure Rich does), I don't need or
want a cheering squad turning this into a personality debate. There never
has been anything personal at all in this so far as I'm concerned. It's
simply a matter of technical accuracy and logical analysis.

The technical facts will ALL become absolutely clear if we are given
enough time to work through this, and we all confine ourselves to one area
at a time. The proper place for talking about personal opinions is
rec.radio.policy.

This system is slow at times, so give me time to respond.

73 Tom


From [e-mail] Fri Nov 08 21:58:04 1996
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From: David Kirkpatrick <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: T368 Carbon Mike to D104 question
Date: Fri, 01 Nov 1996 07:23:51 -0500
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Hi,
        I want to change over a D104 Mike but I have not got a
complete manual with schematics yet.  I am looking for a confirmation
to the pinout I think is right.

H goes to ground on the mike
F gets swithed at the mike to H on engaging the ptt on the D104.
C gets audio out.

The opposite side of the microphone which is connected to C goes
to ground at the mike.

Does this seem right?
[e-mail]


From [e-mail] Fri Nov 08 21:58:05 1996
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From: [e-mail] (Winfield Hill)
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 1 Nov 1996 12:27:43 GMT
Organization: The Rowland Institute for Science
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Ed Mullins  <[e-mail]> said...
>
>In article <557p58$[e-mail]>
>[e-mail] (Winfield Hill) wrote:
>>
>> If this thread had serious attendance by semiconductor device engineers
>> (which I am not) we'd see that "Early voltage" would be at the heart of the

>> discussion. Early voltage, VA, or VAF, is very important to the bipolar
>> transistor designer, right along with f_T, beta and base resistance.
>
> I couldn't agree with Mr Hill more completely.  I have been waiting for
> someone to mention Va/Vt. I generally do not respond to questions of
> this nature, but felt compelled upon reading Mr. Hill's posting.
>
> As a practical example consider the following which
> will be somewhat specific to a typical Bipolar IC process,
> but can be applied to transistors in general, BJT, MOS JFET.
>
> Bias a Lateral PNP transistor with a vertical NPN current source.  Let
> the early voltage for the two devices be 20v and 200v respectively. ...
> ... This leads to the simple yet useful conclusion
> that the maximum voltage gain from a single transistor stage will
> not exceed Va/Vt. For the aforementioned devices that would imply
> 770 for the PNP and 7700 for the NPN. In practice achieving Va/2Vt is
> more typical for an actively loaded, non cascoded common emitter
> stage, as described above.  Often times this is aggressive,
> and loading must always be considered.

Yeah!  An integrated-circuit designer steps into the fray!  Ed, thanks very
much, you hit the nail on the head.  As you showed, the maximum voltage gain
which can be acheived with only one transistor must be just Va/Vt or 39.5 Va
(at 20 deg C), no matter what the circuit configuration (short of using a
transformer)!!!

It's too bad most of the transistors in popular use by the rest of us come
without a Va spec.  I notice that the SPICE models of typical transistors have

lower Early voltages, say 74V for a 2N2222, see the model at
http://howard.engr.siu.edu/elec/faculty/etienne/spice.overview.html#Bipolar

That would imply a maximum gain of only 2900.

Of course, as you mentioned, there's always the cascode circuit to rescue
things!  And other circuit configurations, such as the classic 741-style opamp
.
With most of the voltage gain achieved in a single stage (to help insure a
single-pole response), the Va/Vt limit problem was solved by feeding the CE
transistor with a current-sourced signal.

--
Winfield Hill    [e-mail]        _/_/_/            _/_/_/_/
The Rowland Institute for Science      _/    _/   _/_/    _/
Cambridge, MA USA 02142-1297          _/_/_/_/  _/   _/  _/_/_/
                                     _/    _/  _/   _/  _/
http://www.artofelectronics.com/    _/    _/    _/_/   _/_/_/_/



From [e-mail] Fri Nov 08 21:58:06 1996
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From: "J. Manuel Rivas" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Avantek Module Info
Date: Fri, 01 Nov 1996 14:49:40 +0100
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I want to use Avantek amplifier modules for built an 10GHz transverter.
But I have not the module specifications and I an not shure if are OK.

The module type are:

Avantek  SWL 87-6023

I supose that work betwen 8 and 12 GHz. The input and output connectors
ares SMA.
I would like to know.

- Working frecuency
- Gain
- Noise figure in 10368 MHz.
- Maximun power output.

I am thinking about put one betwen the antenna and the RX mixer and
other one betwen the TX mixer and the TX antenna.

73 de EA1BLA


From [e-mail] Fri Nov 08 21:58:07 1996
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From: [e-mail] (paul girling)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ham-Homebrew Digest
Date: 1 Nov 96 15:10:26 GMT
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unsubscribe [e-mail]



From [e-mail] Fri Nov 08 21:58:08 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 01 Nov 1996 08:33:12 -0700
Organization: Internet Access of Ventura County
Lines: 74
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References: <[e-mail]> <555qnt$[e-mail]> <559413$[e-mail]>
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In article <559413$[e-mail]>, [e-mail](Jeff
Anderson) wrote:

snip...

> Part of the reason why I ask is because of the damped transients that
> Mr. Measures claims he saw when testing with pulsed drive, which seem
> to be a sign that something is perhaps on the edge of stability. ... ... ...

Even a stable amplifier produces internal, weak, damped wave VHF ringing,
Jeff.  Here's why:
 An  L/C resonant circuit is like a bell.  Strike a bell with a hammer and
it rings, producing a damped wave oscillation.  Shock excite an L/C
resonant circuit. with a current pulse and it rings, very much like a
bell, producing a damped wave oscillation.  The magnitude of the
ringing-voltage is proportional to the Q of the L/C circuit.  Therefore, Q
is probably an important consideration when designing an oscillation
suppressor/dampening  device.

It is not possible to construct an HF amplifier without creating a VHF
resonance in the anode circuit.  The anode has C.  The conductors from the
anode to the HF tank circuit have L.  The tune capacitor completes the
circuit.  (The VHF resonant frequency in the anode-circuits of 1500W
amplifiers varies from roughly 80MHz. to 150MHz.)  Therefore, even a
stable amplifier would exhibit damped-wave VHF transients in its
VHF-resonant anode circui whenever the DC anode-current suddenly increased
or decreased.  //  To view a diagram showing the VHF resonant circuits in
an HF amplifier, see Figure 13 at:
http://www.vcnet.com/measures/

The interesting thing about VHF damped-wave oscillations in the anode
circuit is that they can be observed with no drive signal present, merely
by switching between receive and transmit modes.  When an amplifier is
switched from receive to transmit, or from transmit to receive, the DC
anode current changes abruptly.  A change in DC current is enough to cause
ringing, albeit at a lower amplitude than when greater changes in anode
current are used.  There is no RFI problem because the weak, VHF ringing
signal can not pass through the HF tank and reach the antenna.    A
problem only occurs when the weak ringing signal happens to get amplified,
fed back, re-amplified, on and on.  Bang!   I don't have a clue as to what
phase, current, and voltage relationships between the input and output
signals are required to cause a full blown parasitic oscillation to take
place.  Full blown parasitic oscillations typically take place only
rarely.


The magnitude of the damped-wave VHF signal is weak.  The best way to
observe it is to solder a half-watt 51 ohm resistor across the end of some
sub-minature coax.   Connect the other end of the coax to a spectrum
analyzer and have a look.  Keep in mind that VHF damped-wave ringing is
NOT a VHF parasitic oscillation.

> The claim that the parasitic surpressors (which are designed to stop
> these oscillations) have cured flakey amps (if true), is to me pretty
> compelling evidence that item 1 is true.  If there were no parasitic
> oscillations, then  how could these surpressors fix the problem?
> False claims?  Or perhaps there is a different failure mechanism that
> the surpressors somehow affect in a completely unexpected way?
>
I have never said that lowering the Q of a parasitic suppressor will Stop
parasitic oscillations forever.   It has been my experience, and the
experience of others, that parasitic oscillations are less likely to occur
with lower Q suppressors.  When lower Q suppressors are combined with
suitable glitch-protection diodes and resistors, if perchance a parasite
appears, damage is usually limited to cheap diodes and resistors instead
of uncheap tubes and meters.

Maybe some of the people who have installed lower Q suppressors should be
polled to see what their experiences are?
------------------------------
e-mail copy to Mr. Anderson

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:58:09 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 1 Nov 1996 11:33:16 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <55b1hb$[e-mail]>, [e-mail] (W8JI  Tom)
writes:

>
>The grid meter does read the true effective current, but the voltage is
>not indictated except by direct measurement of the average cathode to
>anode voltage over the portion of the cycle when the cathode is negative
>compared to the grid.

Woops, grid to CATHODE voltage, not anode. Excuse me.


From [e-mail] Fri Nov 08 21:58:10 1996
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From: SM4WDQ
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Problems making PCBs
Date: Fri, 01 Nov 1996 16:34:01 GMT
Organization: Uniplus Internet Access
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[e-mail] (G4YNM) wrote:

>In article <[e-mail]>, [e-mail] (Lars
>Moell) writes:

>>I am etching some PCB's with various results, and the major problem
>>seems to be the plastic film that I use in my copier. To get the
>>"least bad" result here is how I do it:
>>
>>1 Print a papercopy on my laser
>>2 copy to plastic film on a copier, this tends to give better contrast
>>rather than use the plastic film in the laser directly

Call me and ill help you

SM4WDQ  June or July in QTC you will find my phone number




From [e-mail] Fri Nov 08 21:58:11 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 1 Nov 1996 12:21:46 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <[e-mail]>,
[e-mail] (R.L. Measures) writes:

>Question:  Am I talking about arcing the fixed-capacitors or arcing the
>contacts?

Yes, you said the contacts. My mistake.

In any event, the most simple calculation would be the voltage across the
shunt C of the plate tuning cap. We could easily calculate the amount of
VHF current required to produce that voltage.

Correct me if I'm wrong, but you say a VHF or UHF signal can cause all
sorts of current (and hence voltage) to appear across the low reactance of
the capacitor, and yet claim the HF signal current, appearing across a
much higher reactance, can NOT cause this voltage to appear.

That is a direct conflict with circuit theory. The HF circuit, optimized
for gain at HF and with minimal impedance between the source and the
capacitor under question, is expected to produce less voltage across a
higher reactance than a VHF or UHF signal would across a much lower
reactance.

Another conflict with fact is the claim gold can't be damaged by HF
signals, but can be damaged by VHF or UHF signals, and this is somehow due
to skin effect. Yet the grid is not heated by current flow through the
element, it's heated by the kinetic energy of electrons smacking the outer
layer of metal, the gold.

To support that claim, the high boiling point of gold is mentioned and an
implication made the gold is hard to damage. Yet gold is a soft metal with
a low melting point, especially when compared to the tungsten grid base
material with three times gold's melting point.

Even if parasitics of the violent nature described by you could occur
(which I highly doubt) this theory has two insurmountable flaws:

1.) RF is not even required to damage the outer layer first. Even dc heats
the skin only since the heating effect is almost entirely from kinetic
energy of electrons smashing into the grid, not I^2 R losses in the grid.

2.) Gold melts at a much lower temperature than tungsten. Even if the grid
was heated evenly the gold would be damaged long before the tungsten grid
showed damage.

This brings me to the point out the first harmful suggestion in your
articles. You suggest the user remove electronic grid protection circuits
and replace them with resistors or fuses, and claim mistuning or excessive
drive can not hurt the grid. Another claim is adding nichrome will cure
grid damage.

Yet the facts indicate both excessive drive and improper tuning can cause
damaging grid dissipation. Any excess grid dissipation **always** damages
the gold first.

Removing an electronic grid protection circuit, as you suggested, and
replacing it with someting as unreliable and slow as a fuse..or worse yet
your suggestion of using a resistor, will almost guarantee eventual grid
damage from over dissipation in tubes like the 8877, 3CX800A7, and so on.
This is the first of several modifications that actually increase the
likelyhood of tube or related component damage.

All focused beam metal oxide cathode grounded grid tubes require fast
**electronic** grid overload protection. Any suggestion such circuits be
removed, or manufacturer NOT including electronic grid protection, is
doing so contrary to good engineering, simple facts, and common sense.

Unless the goal is to ruin expensive tubes.

73 Tom


From [e-mail] Fri Nov 08 21:58:12 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!news.mel.connect.com.au!news.syd.connect.com.au!news.bri.connect.com.au!fjholden.OntheNet.com.au!news
From: Jon Jenkins <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space
Subject: Announce: RF version 1.1 available (includes limited license facility for evaluation)
Date: 1 Nov 1996 19:50:09 GMT
Organization: Academic Technologies
Lines: 44
Message-ID: <55dk9h$[e-mail]>
NNTP-Posting-Host: ts-gc-1-p1.onthenet.com.au
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If you are not a registered RF user or are not interested in
radio or micorwave circuit design then hit delete now.

This news item announces that a new version of RF (1.1) is available.

The upgrade is available either via ftp:

ftp.onthenet.com.au /pub/academic/

or via WWW ftp:
ftp://ftp.onthenet.com.au/pub/academic

or simply via the WWW
http://www.onthenet.com.au/~academic

The update is free to all existing RF users although you will
have to contact Academic for a new serial number. The encrypt
key to decode the ftp'able zip file pdisk1.zip is the same as
for V1.0.

Also available now to interested parties are time limited
licenses which allow you to use RF's full facilities for a
limited time. Please contact us if you would like to try
RF.

The update is an interim update to add some requested features
and fix some bugs. A major upgrade (1.2) containing many new
features will be available in about four months.

If you have any questions please contact [e-mail]



---------------------------------------------------------
Name:      Academic Technologies       Bongaree Rd,
Voice/Fax: [phone]             Terranora,
Inet:      [e-mail]    NSW, AUSTRALIA 2486
Web:       http://www.onthenet.com.au/~academic
My 3 year old son: "Daddy, why did God put the dinosaurs here first ?"
My 6 year old daughter: "To make it interesting for us!"...think about it
!!
----------------------------------------------------------




From [e-mail] Fri Nov 08 21:58:13 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!news.uwa.edu.au!disco.iinet.net.au!opera.iinet.net.au!news
From: [e-mail] (Richard Hosking)
Newsgroups: rec.radio.amateur.homebrew
Subject: PWM AM and SSB Linear amp questions
Date: Fri, 01 Nov 1996 20:06:27 GMT
Organization: iiNet Technologies Pty Ltd
Lines: 21
Message-ID: <55dki5$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: grunge218.nv.iinet.net.au
X-Newsreader: Forte Free Agent 1.0.82

Greetings from Oz

Has anyone any experience of AM transmitters using PWM of a solid
state power amp? I understand that most broadcast AM transmitters use
this technique nowadays. I intend to do this using a power FET
switching the collector/drain volts of the RF amplifier. Are there any
special problems with this approach? The PWM would work at about 100
KHz so obviously a LPF would be necessary in the supply line following
the switching FET. Ultimately the idea is to apply this to a linear
SSB amp. The low level signal is limited and applied to the final amp
in class C while the amplitude info is "stripped off" and modulates
the final as above. No doubt this has been done before - does anyone
have info re best circuits and the sort of performance
(efficiency/IMD) that could be expected?
Thanks in advance

Richard Hosking
VK6BRO
[e-mail]
http://www.iinet.net.au/~richardh



From [e-mail] Fri Nov 08 21:58:14 1996
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!news.he.net!cnn.nas.nasa.gov!ames!eos!kronos.arc.nasa.gov!meric.arc.nasa.gov!user
From: [e-mail]
Subject: Re: What is the maximum gain that you can get out of a transist
Message-ID: <[e-mail]>
Sender: [e-mail] ([e-mail])
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References: <54rrtb$[e-mail]> <[e-mail]> <5526q8$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:20741 rec.radio.swap:93728 sci.electronics.design:24634 sci.electronics.misc:16770

In article <[e-mail]>, [e-mail] (Bill
Turner) wrote:

> -----------------------------------------------
> Yes, it does.  If you want to make a truly awesome-gain single stage

No, it does not. See below.

> If you think about what's happening when you vary the input to the base, for
 a
> given input (either voltage or current), you get an equivalent change in the
> collector current.  For whatever that change in collector current is, the
> larger the collector load resistor, the larger the voltage impressed across
> it, and therefore the larger the voltage output.  The reason this works like
> it does is that for a bipolar transistor, the collector current is esentiall
y
> independent of the collector voltage, within reason of course.  There has to
> be SOME collector voltage present.  What this means is that for example if t
he
> collector current varies by 1 milliamp and the load resistor is 1000 ohms, t
he
> voltage across the 1000 ohm resistor will vary by 1 volt.  Likewise, if the
> resistor is 10,000 ohms, the voltage will vary by 10 volts, and so on.  All
.......
> 73, Bill W7LZP
> [e-mail]

What you are missing is this: Suppose your supply
voltage is Vcc, and you biased the collector at Vcc/2.
So DC collector current is then Ic=Vcc/2Rc  where Rc is the
collector resistor.

Now small signal transconductance, gm of the transistor is:
gm=q Ic/kT,  so if the voltage applied to base is v1, the change
in the collector current is :

ic= gm v1

and

collector voltage vc :

vc= - Rc ic  or  if you combine all the eqs. above

vc= -Rc q Ic/kT v1

now if you replace Ic with Vcc/2Rc, the output voltage becomes
independent of Rc!

vc=-q Vcc/2kT v1, or the gain is: -q Vcc/2kT! no collector
resistor dependence...

Meric
[e-mail]


From [e-mail] Fri Nov 08 21:58:16 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!cam-news-feed2.bbnplanet.com!shore!news
From: [e-mail] (Winfield Hill)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: 1 Nov 1996 22:47:00 GMT
Organization: Rowland Institute for Science
Lines: 26
Message-ID: <55dul4$[e-mail]>
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Jeff Andle at [e-mail] says...
>
>Winfield Hill <[e-mail]> wrote

>> J M Woodgate,  <[e-mail]> said...
>>>
>>>he maximum gain you can get depends on what circuit configurations
>>> you allow. If you allow positive feedback, the answer is 'infinite'.

>> ... controlled positive feedback: Hmmmm.  Is there a one-transistor
>> (no transformer) circuit configuration for this?
>>
> does a superregenerative receiver count?  ...
> ... provides tremendous output signal - to input signal ratio.

Yes I'd say it counts.  That's good.  Sort of a very-high gain tuned
amplifier!  But now we see, thanks to Ed Mullin's postings, that the
ultimate limit is surely going to be set by the transistor's output
resistance, r_o which is characterised by IC designers with the Early
voltage paramter, Va.

--
Winfield Hill      [e-mail]
Rowland Institute for Science
Cambridge, MA 02142



From [e-mail] Fri Nov 08 21:58:16 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!dispatch.news.demon.net!demon!netcom.net.uk!news.u-net.com!news
From: [e-mail] (Ask for Ron Lindon)
Newsgroups: rec.radio.amateur.homebrew
Subject: ICOM IC706 Any modifications known?
Date: Fri, 01 Nov 1996 23:09:19 GMT
Organization: Success Systems
Lines: 8
Message-ID: <55dvsp$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: success.u-net.com
X-Newsreader: Forte Free Agent 1.0.82

please reply via email as I can only get to view these newsgroups once
every two weeks or so and I might miss a follow up.

Thanks

Ron Lindon, c/o
[e-mail]



From [e-mail] Fri Nov 08 21:58:17 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!in1.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Conrad Micallef)
Newsgroups: rec.radio.amateur.homebrew
Subject: Phase modulation / demodulation
Date: 1 Nov 96 23:46:17 GMT
Organization: ucsd usenet gateway
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I would like to build a phase modulator / demodulator... and relevant links
on the net or books which I can refer to ???

Thanks



From [e-mail] Fri Nov 08 21:58:18 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: MC145170 designs
Date: 1 Nov 1996 15:59:55 -0800
Organization: BEST Internet Communications
Lines: 20
Message-ID: <55e2tr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <[e-mail]>,
David Covert <[e-mail]> wrote:
>
>I am looking for a 2m xmitter implementation of the MC145170.
>
>The MC145170 is a PLL frequency synth that also has a serial
>interface for interfacing with a MCU. The MC145170-1 version
>will go up to 185MHz.
>
>Anyone have anything using the MC145170?
>
>Dave Covert, KB5GOG

The Motorola web page has both data sheets and app notes with
enough info to roll your own.  Mini-Circuits makes a VCO that
would probably perform well as the companion oscillator.

Steve M.
WF6R



From [e-mail] Fri Nov 08 21:58:19 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!netnews.worldnet.att.net!news.u.washington.edu!saul5.u.washington.edu!robi
From: Robijanto Soetedjo <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: 7586, 7587 and 7895 nuvistors
Date: Fri, 1 Nov 1996 16:08:30 -0800
Organization: University of Washington
Lines: 27
Message-ID: <[e-mail]>
Reply-To: Robijanto Soetedjo <[e-mail]>
NNTP-Posting-Host: saul5.u.washington.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: robi

Hi,

I have a couple of new nuvistors:

QTY.  Description

5     7586 RCA Made in USA, New in RCA individual boxes and they are in a
      box-of-five package.

2     7587 RCA Made in USA, New in boxes.

2     7895 RCA Made in USA, New in boxes.

I inherited them and don't know what they are for. I'm not an EE.
I hope I post them in a right group. I did search for nuvistor and 7586
and found a couple newsgroups, inc. this one.
I know their new and used price (Newark and newsgroups info).
I'm selling them as is.

Please make a reasonable offer for all of them.

thanks,

[e-mail]





From [e-mail] Fri Nov 08 21:58:20 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!news.structured.net!crusty.teleport.com!nntp0.teleport.com!ip-pdx09-11
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Importance of coax length on HF   A myth?
Date: Sat, 02 Nov 96 00:44:53 GMT
Organization: EZNEC Antenna Software
Lines: 28
Message-ID: <55e5id$[e-mail]>
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In article <[e-mail]>,
   Dave Hand <[e-mail]> wrote:

>An electrical 1/2 of coax is a tried and true method of mesuring
>the SWR at the antenna feed point remotely for exactly that reason.
>Its totally invisible to the remote test gear. If you doubt it try it!

You probably mean "measuring the impedance at the antenna feed point". If
used for that purpose, even a small amount of coax loss can make a
suprising amount of difference in the measurement. It's particularly bad if
the impedance to be measured is very different from the Z0 of the half
wavelength cable. Loss will cause the value looking into the line to be
skewed toward the Z0 of the cable.

As for SWR measurement, consider an antenna which has exactly a 50 ohm
feedpoint resistance and no reactance. Connect it to your rig with a half
wavelength of 75 ohm cable, and put an SWR meter at the rig end. A 50 ohm
SWR meter will read 1:1. The SWR on the cable is 1.5:1. A 75 ohm SWR meter,
if you can find one, will read 1.5:1. (Actually, the meter will read a
little less due to inevitable cable loss.)

How about an antenna which has a 75 ohm feedpoint resistance and no
reactance, connected to the rig with a 50 ohm cable? A 50 ohm SWR meter at
the rig will measure 1.5:1, regardless of the length of the coax. (Again,
the actual reading will be a little less due to loss, and will decrease
as the coax gets longer because then the loss gets greater.)

Roy Lewallen, W7EL


From [e-mail] Fri Nov 08 21:58:21 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!newsfeed.concentric.net!news-master!news
From: "Mitch, WA4OSR" <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
Subject: Vibroplex web page up...
Date: Fri, 01 Nov 1996 18:56:25 -0600
Organization: The Vibroplex Co., Inc.
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: cnc002059.concentric.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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The Vibroplex web page is now up at-
http://www.vibroplex.com

check it out, and give me your feedback...

thanks,
mitch
--
-------- * * * VIBROPLEX - The oldest name in ham radio! * * ---------
Felton "Mitch" Mitchell, WA4OSR                The Vibroplex Co., Inc.
[e-mail]                               11 Midtown Park, E.
334-478-8873, FAX [phone]                   Mobile, AL 36606-4141


From [e-mail] Fri Nov 08 21:58:23 1996
Path: news1.epix.net!info.cs.uofs.edu!news.ultranet.com!news.sprintlink.net!news-pen-4.sprintlink.net!news.voicenet.com!netnews.upenn.edu!news.misty.com!www.nntp.primenet.com!nntp.primenet.com!dispatch.news.demon.net!demon!the-symposium.demon.co.uk!Mandy
From: Mandy Wright <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Aerial tuner circuit for FM requested
Date: Sat, 2 Nov 1996 01:11:16 +0000
Organization: Radio Services
Lines: 29
Distribution: world
Message-ID: <[e-mail]>
References: <55bqjf$[e-mail]> <[e-mail]>
NNTP-Posting-Host: the-symposium.demon.co.uk
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MIME-Version: 1.0
X-Newsreader: Turnpike Version 3.00 <oJPoSssIZV2StO2Ral+KdVy6du>

In article <[e-mail]>, Charles Wenzel
<[e-mail]> writes
>There is a hobbyist FM preamplifier in our technical library at
>www.wenzel.com. I don't think you need an antenna tuner as much as you need a

>directional antenna. Consider a roof-mounted Yagi FM antenna with a rotator!
>
>[e-mail] wrote:
>>
>> I am looking perhaps in the wrong place for suggestions on how to build an
>> external aerial tuner circuit that would help pull in distant broadcast FM
>> stations.
>>
>> If this is not the best group to send this request to then my apologies, I
>> look forward to your suggestions.
>>
>> Bruce
A roof mounted high gain antenna, with a rotator, low loss feeder to the
receiver. A band tuned (not a broad band) amplifier can be fitted at the
mast head with just enough gain to overcome feeder loss.  The noise
figure should be as low as possible, at least as good as the receiver.
This must also have good dynamic range or it will be crossmodulated by
strong local signals.

Hope this helps
Mandy
(Replying on behalf of my husband who hates computers
despite being a practising RF Engineer!)
Sussex
UK


From [e-mail] Fri Nov 08 21:58:24 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.indy.net!news-out.internetmci.com!newsfeed.internetmci.com!news.bctel.net!news.smartt.com!usenet
From: [e-mail] (duhh)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.swap,rec.radio.broadcast
Subject: Re: $$ FAST CASH $$
Date: Sat, 02 Nov 1996 02:19:34 GMT
Organization: not organized
Lines: 16
Message-ID: <[e-mail]>
References: <01bbc80b$ac7a1ce0$[e-mail]>
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On 1 Nov 1996 03:44:49 GMT, "Obelisk965" <[e-mail]> wrote:



>5.     D.Watson, 2430 W.Territorial Rd., Battle Creek, MI 49015

Is a moron!  Posts a fake email address, yet places his own name &
address! Go figure!! ..more net-link scum!



In the immortal words of Dogbert:

" Perhaps, when committing your first federal crime,
it would be unwise to slap your name and address on it
and mail it to 10,000 people "


From [e-mail] Fri Nov 08 21:58:25 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Importance of coax length on HF   A myth?
Date: Sat, 02 Nov 1996 04:42:40 GMT
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[e-mail] (Roy Lewallen) wrote:
>How about an antenna which has a 75 ohm feedpoint resistance and no
>reactance, connected to the rig with a 50 ohm cable? A 50 ohm SWR meter at
>the rig will measure 1.5:1, regardless of the length of the coax.

I think you meant to say, "...connected to the rig with 75 ohm  coax."


Fred

[e-mail]
[e-mail]
[e-mail]



From [e-mail] Fri Nov 08 21:58:26 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Good source for amplifier tips
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <55dbja$[e-mail]>
Date: Sat, 2 Nov 1996 05:13:32 GMT
Lines: 61

In article <55dbja$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>Even if parasitics of the violent nature described by you could occur
>(which I highly doubt) this theory has two insurmountable flaws:
>
>1.) RF is not even required to damage the outer layer first. Even dc heats
>the skin only since the heating effect is almost entirely from kinetic
>energy of electrons smashing into the grid, not I^2 R losses in the grid.

Ah. What's the electron velocity in the neighborhood of the grid?
As I recall, the grid is located very close to the cathode. The relatively
small grid potential is able to modulate a large electron flow because
that little potential is able to overcome the kinetic energy of the
electrons heading for the anode.

In fact, a potential of about -100 volts seems to completely cancel
the velocity built up due to the anode potential, and cut the tube off.
Thus we're looking at electron kinetic energies in the vicinity of
the grid of less than 100 electron volts are we not? An eV is an
exceedingly tiny amount of kinetic energy.

Now down at the other end of the tube, the electron is really hauling,
and the kinetic impact *is* the major source of heating of the anode.
But down very near the cathode where the grid is located the electrons
are barely getting started accelerating. They're just loafing along.
Kinetic energy is proportional to the square of velocity, and the
electrons just aren't moving that fast right off the cathode. I'm
going to have to see some numbers before I'll buy that kinetic
energy is the primary source for heating the grid.

>2.) Gold melts at a much lower temperature than tungsten. Even if the grid
>was heated evenly the gold would be damaged long before the tungsten grid
>showed damage.

Yeah, but the plating will spall off due to core thermal expansion
long before it can melt. It won't melt and form spherical melt balls
splattered around the innards of the tube if the heating is uniform.
There'll be flakes and ribbons of gold strewn around the tube if the
heating is uniform.

>This brings me to the point out the first harmful suggestion in your
>articles. You suggest the user remove electronic grid protection circuits
>and replace them with resistors or fuses, and claim mistuning or excessive
>drive can not hurt the grid. Another claim is adding nichrome will cure
>grid damage.

Oh, oh, that does sound like bad advice.

>Yet the facts indicate both excessive drive and improper tuning can cause
>damaging grid dissipation. Any excess grid dissipation **always** damages
>the gold first.

I still don't think you've made a case for this. Excess RF dissipation
yes, excess DC dissipation, you'll have to do better if you want to
explain the melt balls.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Nov 08 21:58:27 1996
From: [e-mail] (David Covert)
Subject: Wanted: MC145170 designs
Date: 1 Nov 96 21:21:41 -0800
Message-ID: <[e-mail]>
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I am looking for a 2m xmitter implementation of the MC145170.

The MC145170 is a PLL frequency synth that also has a serial
interface for interfacing with a MCU. The MC145170-1 version
will go up to 185MHz.

Anyone have anything using the MC145170?

Dave Covert, KB5GOG


From [e-mail] Fri Nov 08 21:58:27 1996
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From: Vince Curtis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood TH-28a mod
Date: Fri, 01 Nov 1996 21:53:04 -0800
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Does anyone have info about modifying this unit ? Please help. Thanks-
Vince


From [e-mail] Fri Nov 08 21:58:29 1996
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From: Charles Wenzel <[e-mail]>
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: Fri, 01 Nov 1996 22:04:57 -0800
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Bill Turner wrote:
>
> Charles Wenzel <[e-mail]> wrote:<clip>
>The gain really doesn't go
>up with the collector resistance as you suggest.

> -----------------------------------------------
> Yes, it does.  If you want to make a truly awesome-gain single stage
> amplifier, instead of a resistor in the collector, use another transistor as
 a
> current source, which acts essentially as an infinitely high value resistor.
<much clipped>

No it doesn't! The current source transistor provides a high impedance AND alo
t of DC
current. The Thevenin equivalent of this source is a high value resistor drive
n by a
VERY high voltage. The voltage is what gives you the voltage gain. Really!

The current in the emitter diode is about Vin x Ic /.025. The voltage out is t
his qty.
times Rout. The gain is Vout/Vin which is Ic x Rout/ .025. And note that Ic x
Rout is
the voltage across the load resistor. When you fiddle with Rout you change the
 voltage
across it or the collector current. You are cheating when you add another tran
sistor
which gives lots of DC current AND a high Z as explained above. The gain is "a
bout" 39
times the voltage or "equivalent" voltage across the collector resistor up to
gains of
many thousands.


From [e-mail] Fri Nov 08 21:58:31 1996
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From: Charles Wenzel <[e-mail]>
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: Fri, 01 Nov 1996 22:08:35 -0800
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Winfield Hill wrote:
<<clip>>
> Of course, as you mentioned, there's always the cascode circuit to rescue
> things!  And other circuit configurations, such as the classic 741-style opa
mp.
> With most of the voltage gain achieved in a single stage (to help insure a
> single-pole response), the Va/Vt limit problem was solved by feeding the CE
> transistor with a current-sourced signal.
>

Here is where I step in it! Does the current source get around the Va/Vt limit
 or
simply give a Thevenin equivilant with a high voltage and large resistance (an
d thus
more gain)? I hope the latter since I just posted that theory elsewhere!


From [e-mail] Fri Nov 08 21:58:31 1996
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From: Charles Wenzel <[e-mail]>
Newsgroups: sci.electronics.design,sci.electronics.misc,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: Fri, 01 Nov 1996 22:14:02 -0800
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Winfield Hill wrote:
>
> Jeff Andle at [e-mail] says...
> >
> >Winfield Hill <[e-mail]> wrote
>
> >> J M Woodgate,  <[e-mail]> said...
> >>>
> >>>he maximum gain you can get depends on what circuit configurations
> >>> you allow. If you allow positive feedback, the answer is 'infinite'.
>
> >> ... controlled positive feedback: Hmmmm.  Is there a one-transistor
> >> (no transformer) circuit configuration for this?
> >>
> > does a superregenerative receiver count?  ...
> > ... provides tremendous output signal - to input signal ratio.
>
> Yes I'd say it counts.  That's good.  Sort of a very-high gain tuned
> amplifier!  But now we see, thanks to Ed Mullin's postings, that the
> ultimate limit is surely going to be set by the transistor's output
> resistance, r_o which is characterised by IC designers with the Early
> voltage paramter, Va.
>
> --
> Winfield Hill      [e-mail]
> Rowland Institute for Science
> Cambridge, MA 02142

Superregens do oscillate. The break into brief oscillations at a "quench" freq
uency,
usually above audio. The input signal modifies the rate of this oscillation (o
r its
duration in external quench types) and hence the amount of power consumed by t
he circuit.
Perhaps regen receivers?


From [e-mail] Fri Nov 08 21:58:33 1996
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From: John Rabson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Insides of HF tuner MJF-941 or similar
Date: Sat, 2 Nov 1996 07:54:39 GMT
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In message <01bbc751$f89037a0$b16a60cf@wizzard>
        "Kenneth Carrigan" <[e-mail]> writes:

> Doing some plasma experiments with 28 MHz ISM band
                                     ----------------

Isn't 28 MHz an amateur-only allocation?

73 de G3PAI





From [e-mail] Fri Nov 08 21:58:33 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Importance of coax length on HF   A myth?
Date: Sat, 02 Nov 96 08:55:34 GMT
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In article <55ejg1$[e-mail]>,
   [e-mail] (J. Fred Riley) wrote:
>[e-mail] (Roy Lewallen) wrote:
>>How about an antenna which has a 75 ohm feedpoint resistance and no
>>reactance, connected to the rig with a 50 ohm cable? A 50 ohm SWR meter
at
>>the rig will measure 1.5:1, regardless of the length of the coax.
>
>I think you meant to say, "...connected to the rig with 75 ohm  coax."

Nope. Often as I screw up, I managed to say what I meant this time. But the
50 ohm SWR meter would also read 1.5:1 for any length of cable if the cable
were 75 ohms. (Of course the SWR on the cable is 1:1 in this case, not
1.5:1 as it would be if the cable were 50 ohms.)

Roy Lewallen, W7EL


From [e-mail] Fri Nov 08 21:58:35 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 2 Nov 1996 04:34:06 -0500
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:
>
>I do not agree that anode voltage has anything significant to do with
grid
>dissipation.

I corrected that, it should hve been grid to cathode voltage

Could you comment on my dissipation figures and the causes of gold damage?

>> In a grounded grid amplifier, with the anode mistuned, negative
feedback
>> is removed and both the duty cycle of the grid and grid to cathode
voltage
>> (and hence current) increases.
>
>HELLO, TOM.   Oscillations occur in amplifiers that have previously been
>tuned correctly.

Hello Rich,

You said:
>When the anode (tank) is mistuned, negative-feedback is reduced, but not
>removed like throwing a switch.  However, the negative-feedback is only
at
>the operating frequency.

Not at all. It affects the input and anode impedance at every frequency,
at the parasitic frequency and even dc.

I'm not sure if I wasn't clear enough. I sopke of feedback in to separate
contexts, one was when I was discussing grid damage. In that case, if
loading is reduced negative feedback is reduced. Since the input and
output are in series in a grounded grid amplifier, feedback is dependent
on the ratioo of driving impedance to output impedance. In this case,
lighter loading (higher anode impedance) causes grid current and grid
dissipation to increase. This is the primary cause of grid damage in
grounded grid focused beam power grid tube PA's, and the reason for damage
to the gold plating (low temp) of the tungsten grid (high temp). It is a
virtual certainty that improper loading (for higher drive levels) will
cause damage to the grid. Contrary to your claims the effect is kinetic
energy (the collision) from electrons hitting the outer surface of the
grid that causes heating, distributed resistance (and hence skin effect)
has no effect, since the heating is not from I^2 R losses. And contrary to
your claims the gold melts at much lower temperature (three times) than
the tungsten core grid. As I said, Eimac gives a rated grid dissipation
based on the effect of electron bombardment, not I^2 R heating of the
element.

Let's not mix that issue with this one:

The other case delt with any possible oscillation. If the tube started to
oscillate, the anode impedance would decrease. If the oscillation caused
grid current to flow, the grid impedance would drop. Feedback
(regenerative in this case) would decrease. The path is this:

gnd----Anode Z-----][----grid Z---gnd

A decrease of anode Z (because it controls the source voltage) or grid Z (
the load) causes a reduction in feedback, and a limitation of amplitude.
So it is impossible for a stage operating below the the limits of
self-oscillation, to suddenly break into uncontrolled catastrophic
oscillation as you theorize.

>Are amplifiers oscillating at the operating
>frequency?

No, most likely they are not oscillating at all in the real world. They
either are unstable at any hour of the day, or they are not. They don't
conveniently oscillate just for one quick instant of time just to support
theories. Oscillator theory isn't esoteric.

>The problem is that at the VHF ringing frequency of the
>anode resonant circuit---it's POSITIVE-FEEDBACK, an essential ingredient
>for oscillation.

Why do you say ringing is positive feedback? Feedback, by definition, has
to include the path from output to input. Ringing isn't any kind of
feedback, it's just an effect of resonance.

73 Tom


From [e-mail] Fri Nov 08 21:58:36 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sat, 02 Nov 1996 02:55:27 -0700
Organization: Internet Access of Ventura County
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References: <[e-mail]> <55dbja$[e-mail]>
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In article <55dbja$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In article <[e-mail]>,
> [e-mail] (R.L. Measures) writes:
>
> >Question:  Am I talking about arcing the fixed-capacitors or arcing the
> >contacts?
>
> Yes, you said the contacts. My mistake.
>
> In any event, the most simple calculation would be the voltage across the
> shunt C of the plate tuning cap. We could easily calculate the amount of
> VHF current required to produce that voltage.
>
> Correct me if I'm wrong, but you say a VHF or UHF signal can cause all
> sorts of current (and hence voltage) to appear across the low reactance of
> the capacitor, and yet claim the HF signal current, appearing across a
> much higher reactance, can NOT cause this voltage to appear.
>
> That is a direct conflict with circuit theory.

Initially, I was also puzzled by the seeming ease with which a VHF
oscillation can arc over a tune capacitor with a much higher HF peak
voltage rating than is required for the amplifier. However, capacitor
plates are arcing/melting too often to ignore.  One possible explanation
is that VHF and especially UHF voltage is not like 60Hz voltage.  I built
a high power amplifier for 432MHz, and I experienced some UHF arcing.
UHF's ability to arc large gaps was awesome.   The sound, smell, and the
purplish-red color of the UHF arc is like something out of this world.

According to aerodynamic theory, a bumblebee can not fly.  However,
bumblebees in this neighborhood seem to manage a fairly good imitation.

Here's an AC theory question, Tom.  Do think it is possible to take
120V/60Hz and make 10,000V/60Hz with one capacitor and one inductor?
---------------------
e-mail copy to Mr. Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:58:37 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sat, 02 Nov 1996 03:34:18 -0700
Organization: Internet Access of Ventura County
Lines: 28
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References: <[e-mail]> <55f4ie$[e-mail]>
NNTP-Posting-Host: port13.vcnet.com

In article <55f4ie$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
> >
snip...

> >The problem is that at the VHF ringing frequency of the
> >anode resonant circuit---it's POSITIVE-FEEDBACK, an essential ingredient
> >for oscillation.
>
> Why do you say ringing is positive feedback? Feedback, by definition, has
> to include the path from output to input. Ringing isn't any kind of
> feedback, it's just an effect of resonance.
>
Did I say  that ringing was a kind of feedback?  Did I say that ringing is
positive feedback?

The VHF ringing signal in the anode resonant circuit is fed back to the
cathode input by the anode-to-cathode feedback capacitance of the tube.
The VHF feedback is positive because the HF tuned output and HF tuned
input are not even in the picture at VHF.
--------------------------------
e-mail copy to Mr. Rauch.

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:58:38 1996
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From: "Kenneth Carrigan" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Insides of HF tuner MJF-941 or similar
Date: 2 Nov 1996 15:02:37 GMT
Organization: CARRIGAN ELECTRONICS
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John Rabson <[e-mail]> wrote in article
<[e-mail]>...
> In message <01bbc751$f89037a0$b16a60cf@wizzard>
>         "Kenneth Carrigan" <[e-mail]> writes:
>
> > Doing some plasma experiments with 28 MHz ISM band
>                                      ----------------
>
> Isn't 28 MHz an amateur-only allocation?
>
> 73 de G3PAI
>
I'm using the CB band specifically which I believe is ISM band.
27.15 MHz, the medical community uses this for diathermy.

Anyway, the question is How about a matching circuit?  I'll
only be using a 250 Watt amplifier but desire about 1000volts
into an Argon gas to ignite it.  A faraday cage will also be used
as to NOT radiate this energy.


From [e-mail] Fri Nov 08 21:58:39 1996
Path: news1.epix.net!info.cs.uofs.edu!news.ultranet.com!homer.alpha.net!uwm.edu!cs.utexas.edu!swrinde!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (KA4IKH)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB ARRL Handbooks and ARRL Publications
Date: 2 Nov 1996 11:26:14 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <55fsn6$[e-mail]>
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NNTP-Posting-Host: newsbf02.mail.aol.com

I am interested in purchasing for my personal collection, any ARRL
Handbooks or other ARRL publications (prior to 1970).  I am also
interested in pre-1960's QSL cards and logbooks.  Anything of historical
interest to amateur radio.

This is for my personal collection, and will not be resold.

Thanks, and 73's

David
KA4IKH


From [e-mail] Fri Nov 08 21:58:40 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!europa.winmail.com!Jeanne Angle
From: [e-mail] (Ron Angle)
Newsgroups: rec.radio.amateur.homebrew
Subject: Antenna relays
Date: Sat, 02 Nov 96 16:36:29 GMT
Organization: World Information Network Systems
Lines: 11
Message-ID: <55gpdt$[e-mail]>
NNTP-Posting-Host: sodium.shocking.com
X-Newsreader: News Xpress 2.0 Beta #0

I would appreciate input from anyone who has used separate relays for the
input and output on grounded grid linear amplfiers (as opposed to using a
single DPDT relay). Is there a problem if two separate relays do not close
simultaneously?


=*=* ==*=    =** =**=    =** *    *= =*** =**** ==** =**=
                Ron Angle, Chico CA
* Amateur radio operator since 1955, current call AB6ZX *
       (former calls K6KYJ, BV1US, KL7FAR, N6DOJ)



From [e-mail] Fri Nov 08 21:58:41 1996
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From: [e-mail] (Dan Finn)
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
Subject: Re: Vibroplex web page up...
Date: Sat, 02 Nov 1996 16:57:47 GMT
Lines: 20
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"Mitch, WA4OSR" <[e-mail]> wrote:

>check it out, and give me your feedback...

My only negative comments are:

1) No pricing information. Why not? When customers go to the trouble
    of finding a website, the pricing should already be there. Why not
    put it there???

2) Why not allow customers to purchase from the website? Many people
are not as hung up on security as others. Besides, netscape 3.0 is
secure enough for most people.

Lot's of postives. Nice products (the 'best' of course!)

73

KR4AJ



From [e-mail] Fri Nov 08 21:58:42 1996
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From: [e-mail] (R.L. Measures)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sat, 02 Nov 1996 10:56:11 -0700
Organization: WestNet
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In article <[e-mail]>, "Ian White, G3SEK"
<[e-mail]> wrote:

> W8JI  Tom wrote:
>
> >when the gain of an oscillator exceeds
> >the feedback loss (including less than perfect phase) it oscillates, when
> >gain is less than feedback loss, it stops oscillating. Since the gain of a
> >tube decreases as anode or grid current is increased, the natural effect
> >is the oscillator finds a point of equilibrium where output stabilizes. If
> >a class AB  tube oscillates at full drive, it will continue to oscillate
> >when drive is removed.
>
> That's what has always puzzled me - why do these "parasitic
> oscillations" happen so intermittently?
>
> When the amplifier goes bang after sitting quietly under essentially the
> same operating conditions for several hours, the real question is: why
> didn't it happen hours ago? Are the conditions for oscillation soooo
> very special?
>
Ian
------
 There is a somewhat logical explanation for this puzzlement, Ian, although
it may sound a bit bizarre at first.  A power grid tube presumably should
not be able to conduct current during receive mode when the cathode bias
relay contacts are open, which applies cut-off bias to the tube.
Certainly, conduction is not possible by a means *inside* the amplifier.

 After the first article I wrote about vhf parasitics was published in *Ham
Radio*, I began to get scattered reports of parasitic oscillations
allegedly having taken place when the amplifier was sitting quietly with
the tube cut off.   I asked many  people about this phenomenon.  There was
only one scientificly-based explanation we could come up with.  (Someone
suggested that any amplifier that exhibits occasional arcing on standby,
can only be cured by an exorcism.)

A Geiger counter is a useful instrument for measuring background radiation.
I own a Mada Devices, Inc. Geiger counter.   I just switched it on.   The
background radiation level is currently varying between  0.001 and roughly
0.005 mR/hr..   Eventually a high-energy photon of radiation just might
cruise through here, at the speed of light of course, and something
interesting might happen. ................ Update:  During the last minute
there was one 0.070 hit and one 0.052 hit.  From past experience, I know
there are occasionally much larger readings.  During solar flares, I have
seen readings roughly 10 times higher.  However,  this might be a
coincidence. .
 When high energy photons of radiation pass through a Geiger tube, the
photons collide with atoms, and temporaritly knock electrons free.  The
freed electrons become current carriers.   This causes current to flow
through the tube and the meter basicly indictes the resulting current. If
high energy photons can create current carriers by striking atoms within a
Geiger tube, does it seem possible that high energy photons could create
current carriers by strinking atoms within an amplifier tube?  If this is
possible, then the amplifier tube could conduct briefly without the cathode
bias relay being closed.  Naturally a current pulse would cause the anode
circuit to ring at its vhf self resonance, and a vhf parasitic oscillation
just might be possible.  If a full blown parasitic perchance gets started
during such an event, the puny open contact gap on the cathode bias relay
would immediately break down, form a metal-vapour arc, and happily conduct
much current, with a maximum V drop of only 15v.

QST would not allow the mention of background radiation in "Parasitics
Revisited" (QST, Sep./Oct. 1990)
----------------------
e-mail copy to Ian White, G3SEK  Editor, *The VHF/UHF DX Book*, "In
Practice" columnist for *RadCom* (RSGB)

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:58:43 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!coopnews.coop.net!zdc!super.zippo.com!zdc-e!feed1.news.erols.com!howland.erols.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!netcom.net.uk!ix.netcom.com!news
From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 2 Nov 1996 18:06:17 GMT
Organization: Netcom
Lines: 11
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References: <[e-mail]> <55dbja$[e-mail]> <[e-mail]> <[e-mail]>
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X-NETCOM-Date: Sat Nov 02 12:06:17 PM CST 1996


    I don't understand why no-one hasn't contacted Eimac (Varian)
regarding the gold-sputtering issue.  Rather than argue the physics
back and forth, couldn't this issue be settled, quickly and simply,
with a phone-call or two to the experts?  Somebody there must have a
handle on this problem.

    The 8877 is manufactured in Salt Lake City.  Their number is
801-972-5000.  The San Carlos (California) number is 415-592-9988.

- Jeff, WA6AHL


From [e-mail] Fri Nov 08 21:58:44 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: For Sale - Milling Machine/Drill press.
Date: 2 Nov 1996 18:45:17 GMT
Organization: OS/2 Kicks WIN95 anyday
Lines: 11
Distribution: world
Message-ID: <55g4rt$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: vhf.reno.nv.us
X-Newsreader: IBM NewsReader/2 v1.2.5

ATTENTION - Antenna and amplifier builers...
For Sale:
Grizzly 12 speed bench model drilling and milling mechine
Includes X - Y table with removable vice, Drill chuck, drill motor with 8 spee
ds.
Powered by 100V AC. Used to construct many VHF/UHF yagis and amplifier parts.
$850.00

Contact my father - Claude Marek at [phone] between 5 and 9 PM PST

Thank, Tim - NC7K... sk



From [e-mail] Fri Nov 08 21:58:45 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sat, 02 Nov 1996 12:16:04 -0700
Organization: Internet Access of Ventura County
Lines: 44
Message-ID: <[e-mail]>
References: <[e-mail]> <55dbja$[e-mail]> <[e-mail]> <[e-mail]> <55g2ip$[e-mail]>
NNTP-Posting-Host: port35.vcnet.com

In article <55g2ip$[e-mail]>,
[e-mail](Jeff Anderson) wrote:

>     I don't understand why no-one hasn't contacted Eimac (Varian)
> regarding the gold-sputtering issue.  Rather than argue the physics
> back and forth, couldn't this issue be settled, quickly and simply,
> with a phone-call or two to the experts?  Somebody there must have a
> handle on this problem.
>
>     The 8877 is manufactured in Salt Lake City.  Their number is
> 801-972-5000.  The San Carlos (California) number is 415-592-9988.
>
> - Jeff, WA6AHL
--------------------------
Someone has contacted Eimac, Jeff.  The fly in the ointment is that the
8877 design team no longer works at Varian-Eimac.  //  BTW, rumor has it
that Eimac sold their glass tube division to General Electric.

In February of 1986, I had a discussion with the  specs engineer who
worked with the 8877's engineers..  He told me that the tube engineers
discovered the gold sputtering problem during the testing phase of the
8877's development.  They concluded that gold sputtering from the grid
plating was due to parasitic oscillations.  One look through a microscope
convinced me they were right.

 When I spoke with an Eimac engineer in early 1991 about their warranty
policy on gold-sputter damaged tubes, he told me that if even if a tube is
leaky because of sputtered gold, the tube is replaced without question.
He said that the people in the warranty division are not even set up to
test for gold-sputtering.

The bottom-line is that at least one engineer was aware of the
gold-sputtering problem in 1991.

I find it curious that the folks in the warranty division were/are
clueless, and nobody seems to care.  Or, maybe it's just a hold-over from
the days when Eitel and McCullough owned the company, and ANY kaput tube
made by Eimac was replaced without question.  Truly, the customer was
always right.
------------------------------
e-mail copy to Mr. Anderson

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:58:46 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED: plans or schematics for a digital repeater. i need to build a newer controller!. all extras too.
Date: Sat, 02 Nov 1996 21:48:23 GMT
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From [e-mail] Fri Nov 08 21:58:47 1996
Path: news1.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!shore!news
From: [e-mail] (Winfield Hill)
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 2 Nov 1996 22:31:09 GMT
Organization: Rowland Institute for Science
Lines: 48
Message-ID: <55gi3d$[e-mail]>
References: <54rrtb$[e-mail]> <[e-mail]> <[e-mail]> <557p58$[e-mail]> <559h3v$[e-mail]> <55cqbv$[e-mail]> <[e-mail]>
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Charles Wenzel at [e-mail] says...
>
>Winfield Hill wrote:
><<clip>>
>> Of course, as you mentioned, there's always the cascode circuit to rescue
>> things!  And other circuit configurations, such as the classic 741-style
>> opamp.  With most of the voltage gain achieved in a single stage (to help
>> insure a single-pole response), the Va/Vt limit problem was solved by
>> feeding the CE transistor with a current-sourced signal.
>>
>
> Here is where I step in it! Does the current source get around the Va/Vt
> limit or simply give a Thevenin equivilant with a high voltage and large
> resistance (and thus more gain)?  I hope the latter since I just posted
> that theory elsewhere!

Is this semantic territory?  I saw your "gain-comes-from-voltage" idea in
this thread, and surely using thevenin equivalent circuit elements is fine,
although I don't usually think of it that way when using current sources.

Wrt to the Va/Vt limit problem, I was thinking about the "Early effect,"
which causes most of the apparent collector output resistance in the first
place.  The Early effect says that Vbe for a given Ic will change a little
bit if you change the collector voltage.  This also means that for a constant
Vbe, the collector current will change a little bit as you change collector
voltage. This change can be seen as an little current flowing in a resistor
loading the collector - hence r_o.

Incidentally, if r_o is defined just from the "Early voltage," Va, then
r_o = Va / Ic (r_o changes with collector current) and the size of the Early
effect is dVbe/dVc = Vt/Va where as usual Vt = kT/q.  For the 2N2222 spice
model, with Va = 74V (i.e. r_o = 74k at 1mA), this is 0.00034.  I digress.

Think of a common-emitter cascode amplifier.  Because the collector of the CE
transistor drives the cascode emitter and doesn't experience significant
voltage variation, it doesn't have an Early-effect Vbe problem.  The cascode
transistor doesn't have an Early-effect Vbe problem either, because its
emitter input is driven by a current source.  Although there will be changes
in Vbe as the output swings up and down, the bulk of the current in the
emitter still has to appear in the collector.

That's the "solution" to the Va/Vt limit.

--
Winfield Hill      [e-mail]
Rowland Institute for Science
Cambridge, MA 02142



From [e-mail] Fri Nov 08 21:58:48 1996
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From: [e-mail] (Lewis Cobb External)
Newsgroups: rec.radio.amateur.homebrew
Subject: Anyone got Ham Radio Mag Jan/79?
Date: 2 Nov 1996 22:41:06 GMT
Organization: University of New Brunswick, Fredericton, NB, Canada
Lines: 12
Message-ID: <55gim2$[e-mail]>
NNTP-Posting-Host: jupiter-alt3.unb.ca
X-Newsreader: TIN [version 1.2 PL2]

Hi - I am looking for Ham Radio magazine Jan/79 if anyone has it.  There
is an article on anodizing aluminum that I'd like to get a copy of - pages
62-69 I think...

Please e-mail if anyone has access to it.

Thanks very much

Lewis
[e-mail]




From [e-mail] Fri Nov 08 21:58:49 1996
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From: Mandy Wright <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Phase modulation / demodulation
Date: Sun, 3 Nov 1996 01:18:07 +0000
Organization: Radio Services
Lines: 17
Distribution: world
Message-ID: <Y2OhsMAPL$[e-mail]>
References: <[e-mail]>
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X-Newsreader: Turnpike (evaluation) Version 3.01 <vPIC5CuyknR3CUk2Urj2HsHwi2>

In article <[e-mail]>, Conrad Micallef
<[e-mail]> writes
>I would like to build a phase modulator / demodulator... and relevant links
>on the net or books which I can refer to ???
>
>Thanks
>
Try the VHF MAnual George Jessop RSGB
Receiver- 4,29 onwards   Transmitter 5,31 onwards  for starters.
Hope this helps
Mandy
(Typing on behalf of my husband who hates computers
despite being a practising RF Engineer!  I know _nothing_ about RF!!)
Sussex
UK                Please note the NEW ADDRESS!

Turnpike evaluation. For information, see http://www.turnpike.com/


From [e-mail] Fri Nov 08 21:58:52 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!news.primenet.com!news.primenet.com!not-for-mail
From: Bob Doyle <[e-mail]-FOR-EMAIL>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 2 Nov 1996 20:30:05 -0700
Organization: Primenet Services for the Internet
Lines: 28
Message-ID: <[e-mail]-FOR-EMAIL>
References: <[e-mail]> <55dbja$[e-mail]> <[e-mail]>
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Guys,

[Interrestion discussion about stability snipped]

"OK, I'll bite...", said Bob, leading with the chin...

First thought.  With transistor amplifiers one can verify by modelling
and Linville stability curves (spelled wrong I'm sure) whether an
amplifier is unconditionally or only conditionally stable.  Do models of
these tubes exist?  Can the stability be analyzed/proved?  I think I've
seen spice models for receiving tubes.

Second thought.  I've never designed a tube power amplifier but I have
some experience designing with CRT tubes.  CRT tubes arc over on
occasion.  In an effort to improve the robustness of an problematic
airborne CRT display we decided to make measurements of a CRT arc in
process.  We used a pulsed welding laser aimed at the electrodes inside
the neck of the tube to facilitate an arc.  When we fired the laser, we
would create a conductive plasma from the vaporized electrode metal and
an arc would ensue.  One thing that became evident is that the di/dt
from an arc in a vacuum is much higher than the di/dt from an arc in
air.  Indeed sub nanosecond current risetimes were observed.  VHF
ringing was also observed in the anode wiring.  Just wondering if this
could explain VHF excitation
of the output network.

Bob Doyle
WA3TGF


From [e-mail] Fri Nov 08 21:58:53 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PWM AM and SSB Linear amp questions
Date: Sun, 03 Nov 1996 04:53:39 GMT
Organization: INTERNET AMERICA
Lines: 24
Message-ID: <55h8gl$[e-mail]>
References: <55dki5$[e-mail]>
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[e-mail] (Richard Hosking) wrote:
> the idea is to apply this to a linear
>SSB amp. The low level signal is limited and applied to the final amp
>in class C while the amplitude info is "stripped off" and modulates
>the final as above. No doubt this has been done before - does anyone
>have info re best circuits and the sort of performance
>(efficiency/IMD) that could be expected?

We do this all the time in our shortwave transmitters.  Anode
conversion efficiency exceeds 85%, modulator efficiency is 97%, and
the IMD is easily -40 at 2,000 KW PEP.  The critical aspect is to
match the amplitude response and phase delay of the RF signal to the
transmitter's modulator--along with having a low-distortion modulator,
of course. You will find may suitable phase/amplitude correction
circuits to copy in any AM stereo exciter that can be scaled to your
SSB generation frequency.


Fred

[e-mail]
[e-mail]
[e-mail]



From [e-mail] Fri Nov 08 21:58:54 1996
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From: Charles Wenzel <[e-mail]>
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: Sat, 02 Nov 1996 21:38:21 -0800
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Winfield Hill wrote:
>
> Charles Wenzel at [e-mail] says...
> >
> >Winfield Hill wrote:
> ><<clip>>
> >> Of course, as you mentioned, there's always the cascode circuit to rescue
> >> things!  And other circuit configurations, such as the classic 741-style
> >> opamp.  With most of the voltage gain achieved in a single stage (to help
> >> insure a single-pole response), the Va/Vt limit problem was solved by
> >> feeding the CE transistor with a current-sourced signal.
> >>
> >
> > Here is where I step in it! Does the current source get around the Va/Vt
> > limit or simply give a Thevenin equivilant with a high voltage and large
> > resistance (and thus more gain)?  I hope the latter since I just posted
> > that theory elsewhere!
>
> Is this semantic territory?  I saw your "gain-comes-from-voltage" idea in
> this thread, and surely using thevenin equivalent circuit elements is fine,
> although I don't usually think of it that way when using current sources.
>
> Wrt to the Va/Vt limit problem, I was thinking about the "Early effect,"
> which causes most of the apparent collector output resistance in the first
> place.  The Early effect says that Vbe for a given Ic will change a little
> bit if you change the collector voltage.  This also means that for a constan
t
> Vbe, the collector current will change a little bit as you change collector
> voltage. This change can be seen as an little current flowing in a resistor
> loading the collector - hence r_o.
>
> Incidentally, if r_o is defined just from the "Early voltage," Va, then
> r_o = Va / Ic (r_o changes with collector current) and the size of the Early
> effect is dVbe/dVc = Vt/Va where as usual Vt = kT/q.  For the 2N2222 spice
> model, with Va = 74V (i.e. r_o = 74k at 1mA), this is 0.00034.  I digress.
>
> Think of a common-emitter cascode amplifier.  Because the collector of the C
E
> transistor drives the cascode emitter and doesn't experience significant
> voltage variation, it doesn't have an Early-effect Vbe problem.  The cascode
> transistor doesn't have an Early-effect Vbe problem either, because its
> emitter input is driven by a current source.  Although there will be changes
> in Vbe as the output swings up and down, the bulk of the current in the
> emitter still has to appear in the collector.
>
> That's the "solution" to the Va/Vt limit.
>
> --
> Winfield Hill      [e-mail]
> Rowland Institute for Science
> Cambridge, MA 02142

I suppose it is semantics but I have seen others suggest that the gain comes f
rom
the high impedance of the current source alone. But a current source would run
 into
the same gain limit as an equal value resistor if it weren't for the higher DC

current. The Thevenin equivalent description just seems irresistably simple. I
'm
not sure that the current source gets around r_o but rather lets you approach
it
(gain of 39 x Va) with a reasonable collector current.

The cascode circuit is a different matter!


From [e-mail] Fri Nov 08 21:58:55 1996
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From: [e-mail] (James Lee)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.space
Subject: ELECTRONICS TIMES publisher is sick?
Date: 3 Nov 1996 09:00:20 GMT
Organization: Metropolitan Amateur Repeaters' System
Lines: 14
Message-ID: <55hmv4$[e-mail]>
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I got my ham license through a classroom training hosted by an open
446.650 repeater's founder KJ6TQ late 1993 at Burbank Fire Dept.
training center in Calif.  Almost a year ago KM6NP close repeater
system pop up in the same pair who claimed to be coordinated but
has been trying to conquer the pair to shutdown the KJ6TQ repeater.

Mike Mercado or KM6NP, who publishes the Electronics Times, even
installed transmitter just for the purpose of jamming KJ6TQ
operations and periodically broadcast warning to KJ6TQ repeater's
users.

Ham radio operators pride themselves in being polite.  Yeah right!
I can't believe this person whom I presumed smart is SICK.



From [e-mail] Fri Nov 08 21:58:56 1996
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From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 3 Nov 1996 09:03:15 LOCAL
Organization: Starnet
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In article <[e-mail]> [e-mail]
 (R. L. Measures ) writes:
>From: [e-mail] (R. L. Measures )
>Subject: Re: Good source for amplifier tips
>Date: Sun, 03 Nov 1996 07:10:43 -0700

>In article <55b1hb$[e-mail]>, [e-mail] (W8JI  Tom)
>wrote:

>> Hi Rich,

>> It's fun to do lot's of things, but better to look at facts.
>snip...

>> It's very easy to exceed the thermal limitations of the grid in the
>> 3CX800, since the dissipation rating is only a few watts.

>Tom:  What is the rated grid-dissipation for the 3CX800A7?

>> If you like, we
>> can calculate the temperature rise of the grid and prove this, although
>> Eimac has already done this as part of the specs and gives it to us as
>> allowable grid dissipation.
>>
>> At 150 mA of grid current in a typical HF PA, a single 3CX800 has a
>> measured grid dissipation of almost 20 watts. That's almost 5 times the
>> maximum rated dissipation of the grid.
>>
>As close as I can remember, the cathode to grid driving voltage for a
>3CX800A7 is around 40V RMS.  150mA times 40V is 6W.  Does it seem likely
>that a steady 6W is going to raise the temperature of the grid structure
>to over 2000 degrees F?





Fools rush in...

Gentlemen:  Regarding the temperature rise in the grid structure, have you
considered that the grid is very near the cathode and is running at an
elevated temperature even without additional dissipation.

Mind you, I don't have a clue as to the actual spacing or the cathode
temperature in this tube.  Just asking.

73, Wes -- N7WS


From [e-mail] Fri Nov 08 21:58:57 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 03 Nov 1996 06:32:33 -0700
Organization: Internet Access of Ventura County
Lines: 45
Message-ID: <[e-mail]>
References: <[e-mail]> <55dbja$[e-mail]> <[e-mail]> <[e-mail]-FOR-EMAIL>
NNTP-Posting-Host: port5.vcnet.com

In article <[e-mail]-FOR-EMAIL>, Bob Doyle
<[e-mail]-FOR-EMAIL> wrote:

> Guys,
>
> [Interrestion discussion about stability snipped]
snip
> Second thought.  I've never designed a tube power amplifier but I have
> some experience designing with CRT tubes.  CRT tubes arc over on
> occasion.  In an effort to improve the robustness of an problematic
> airborne CRT display we decided to make measurements of a CRT arc in
> process.  We used a pulsed welding laser aimed at the electrodes inside
> the neck of the tube to facilitate an arc.  When we fired the laser, we
> would create a conductive plasma from the vaporized electrode metal and
> an arc would ensue.  One thing that became evident is that the di/dt
> from an arc in a vacuum is much higher than the di/dt from an arc in
> air.  Indeed sub nanosecond current risetimes were observed.  VHF
> ringing was also observed in the anode wiring.  Just wondering if this
> could explain VHF excitation
> of the output network.
>
> Bob Doyle
> WA3TGF
---------------------
Interesting account, Bob.  I think it could explain one mode of VHF
excitation in HF amplifiers.  The faster the risetime of the conduction
cycle, the better the VHF resonances ring.  If the VHF resonant circuit is
connected to a high VHF-gain amplifier tube, oscillation seems like a
possibility.

VHF and UHF parasitics are more common that most engineers seem to realize.
A company that manufacturers argon-arc movie theatre projector-bulbs, was
experiencing occasional, premature projector-bulb failure.  The cause was
traced to an internittent UHF parasitic oscillation.  The bulbs were
redesigned, and the problem went away.  The mechanism that started the UHF
oscillation was somewhat mysterious because the bulbs operate on DC.

Bob, is it true that aircraft encounter higher levels of background
radiation at high altitude?  Did your news server carry my recent post on
the subject of background radiation?
---------------------
e-mail copy to Mr. Doyle

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:58:58 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 03 Nov 1996 07:10:43 -0700
Organization: Internet Access of Ventura County
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Message-ID: <[e-mail]>
References: <[e-mail]> <55b1hb$[e-mail]>
NNTP-Posting-Host: port5.vcnet.com

In article <55b1hb$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> Hi Rich,
>
> It's fun to do lot's of things, but better to look at facts.
snip...
> It's very easy to exceed the thermal limitations of the grid in the
> 3CX800, since the dissipation rating is only a few watts.

Tom:  What is the rated grid-dissipation for the 3CX800A7?

> If you like, we
> can calculate the temperature rise of the grid and prove this, although
> Eimac has already done this as part of the specs and gives it to us as
> allowable grid dissipation.
>
> At 150 mA of grid current in a typical HF PA, a single 3CX800 has a
> measured grid dissipation of almost 20 watts. That's almost 5 times the
> maximum rated dissipation of the grid.
>
As close as I can remember, the cathode to grid driving voltage for a
3CX800A7 is around 40V RMS.  150mA times 40V is 6W.  Does it seem likely
that a steady 6W is going to raise the temperature of the grid structure
to over 2000 degrees F?
---------------------------
e-mail copy to Mr. Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:58:59 1996
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From: [e-mail] (Dave)
Newsgroups: rec.radio.amateur.homebrew
Subject: help!?! WIRING DIAGRAM MOTOROLA SYSTEM 90A
Date: Sun, 03 Nov 1996 15:25:11 GMT
Organization: Texas Networking, Inc.
Lines: 6
Message-ID: <55jfgl$[e-mail]>
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does anyone have a wiring diagram or pinout for motorola system 90a
control head accessories group / syntor vintage?
I have a module to select private line tones and a touch tone module
and no idea of how they connect up
 thanks Dave



From [e-mail] Fri Nov 08 21:59:00 1996
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From: [e-mail] (Maroof H. Choudhury)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: AM detector using PLL
Date: Sun, 03 Nov 96 15:33:43 GMT
Organization: Cyber
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Most common PLL(like the NE564/565) application-notes/data-sheets say that
the PLL can be used for AM detection/demodulation. But I haven't seen any AM
demodulator using a PLL. Can anyone show a few examples of such ckts?
Thanks

Maroof



From [e-mail] Fri Nov 08 21:59:01 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!shore!news
From: [e-mail] (Winfield Hill)
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 3 Nov 1996 15:48:10 GMT
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Charles Wenzel,  <[e-mail]> said...
>
>Winfield Hill wrote:
>>
>> Charles Wenzel at [e-mail] says...
>> >
>> > Here is where I step in it! Does the current source get around the Va/Vt
>> > limit or simply give a Thevenin equivilant with a high voltage and large
>> > resistance (and thus more gain)?  I hope the latter since I just posted
>> > that theory elsewhere!
>>
>> Is this semantic territory? ...
>>
>> Wrt to the Va/Vt limit problem, I was thinking about the "Early effect,"
>> which causes most of the apparent collector output resistance in the first
>> place.  The Early effect says that Vbe for a given Ic will change a little
>> bit if you change the collector voltage. This also means that for a constan
t
>> Vbe, the collector current will change a little bit as you change collector
>> voltage.  This change can be seen as an little current flowing in a resisto
r
>> loading the collector - hence r_o.
>
> I suppose it is semantics but I have seen others suggest that the gain comes
> from the high impedance of the current source alone. But a current source
> would run into the same gain limit as an equal value resistor if it weren't
> for the higher DC current. The Thevenin equivalent description just seems
> irresistably simple. I'm not sure that the current source gets around r_o bu
t
> rather lets you approach it (gain of 39 x Va) with a reasonable collector
> current.
>
> The cascode circuit is a different matter!

Of course, current sources also have an Early-effect-induced r_o problem which

limits the gain.  In the case of a simple pnp transistor current mirror, as
often seen in ICs, the effect can be severe.  Remember Ed Mullins mentioned a
typical bipolar IC process with Va of 20V for pnp compared to 200V for npn
devices.  Using a cascode pnp current source would be a solution, and I've see
n
it in some circuits, but the Wilson current mirror (AoE fig 2.48) also reduces

the effect of Vbe variation with collector voltage, providing a greatly
increased output resistance.

--
Winfield Hill    [e-mail]        _/_/_/            _/_/_/_/
The Rowland Institute for Science      _/    _/   _/_/    _/
Cambridge, MA USA 02142-1297          _/_/_/_/  _/   _/  _/_/_/
                                     _/    _/  _/   _/  _/
http://www.artofelectronics.com/    _/    _/    _/_/   _/_/_/_/



From [e-mail] Fri Nov 08 21:59:02 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.sprintlink.net!news-peer.sprintlink.net!uunet!in2.uu.net!news.vcnet.com!port29.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 03 Nov 1996 09:06:30 -0700
Organization: Internet Access of Ventura County
Lines: 84
Message-ID: <[e-mail]>
References: <[e-mail]> <55b1hb$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port29.vcnet.com

In article <[e-mail]>, [e-mail] (Wes
Stewart) wrote:

> In article <[e-mail]>
[e-mail] (R. L. Measures ) writes:
> >From: [e-mail] (R. L. Measures )
> >Subject: Re: Good source for amplifier tips
> >Date: Sun, 03 Nov 1996 07:10:43 -0700
>
> >In article <55b1hb$[e-mail]>, [e-mail] (W8JI  Tom)
> >wrote:
>
> >> Hi Rich,
>
> >> It's fun to do lot's of things, but better to look at facts.
> >snip...
>
> >> It's very easy to exceed the thermal limitations of the grid in the
> >> 3CX800, since the dissipation rating is only a few watts.
>
> >Tom:  What is the rated grid-dissipation for the 3CX800A7?
>
> >> If you like, we
> >> can calculate the temperature rise of the grid and prove this, although
> >> Eimac has already done this as part of the specs and gives it to us as
> >> allowable grid dissipation.
> >>
> >> At 150 mA of grid current in a typical HF PA, a single 3CX800 has a
> >> measured grid dissipation of almost 20 watts. That's almost 5 times the
> >> maximum rated dissipation of the grid.
> >>
> >As close as I can remember, the cathode to grid driving voltage for a
> >3CX800A7 is around 40V RMS.  150mA times 40V is 6W.  Does it seem likely
> >that a steady 6W is going to raise the temperature of the grid structure
> >to over 2000 degrees F?
>
>> Fools rush in...
>
> Gentlemen:  Regarding the temperature rise in the grid structure, have you
> considered that the grid is very near the cathode and is running at an
> elevated temperature even without additional dissipation.
>
> Mind you, I don't have a clue as to the actual spacing or the cathode
> temperature in this tube.  Just asking.
>
> 73, Wes -- N7WS
---------------------
Hello, Wes--
 The grid to cathode spacing is close.  However, not much surface area of
the grid is exposed to the cathode.  As I recall, the grid is made from
rectangular wire, like the 8877 grid..  The narrow edge of the
rectanglular grid wires face the cathode, so heat transfer is minimal.
Another factor is that gold is excellent for not absorbing infrared
radiation.
---------
e-mail copy to Wes
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--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:59:03 1996
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From: [e-mail] (Stiles D Daniel)
Newsgroups: rec.radio.amateur.homebrew
Subject: tube info
Date: 3 Nov 96 16:55:42 GMT
Organization: ucsd usenet gateway
Lines: 23
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


Hello to all:

Looking for some information--

Am trying to bring back to life an old Heath SB-303 for station at
children's school.

Several have helped with info.

Does anyone have tube substitution information  for the following two
tubes?

6AU6
and a 6EA6

I have a small box of tubes scrounged from other radios that were too far
gone to repair for club.

I used to have the GE substitution book but it has gone elsewhere

Thanks for info
tnx and 73, DAn


From [e-mail] Fri Nov 08 21:59:05 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 3 Nov 1996 17:40:30 +0000
Organization: IFW Technical Services
Lines: 148
Distribution: world
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References: <[e-mail]>
 <555qnt$[e-mail]> <[e-mail]>
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Rich Measures wrote:
>
><[e-mail]> wrote:
>> When the amplifier goes bang after sitting quietly under essentially the
>> same operating conditions for several hours, the real question is: why
>> didn't it happen hours ago? Are the conditions for oscillation soooo
>> very special?
>>
>Ian
>------
> There is a somewhat logical explanation for this puzzlement, Ian, although
>it may sound a bit bizarre at first.  A power grid tube presumably should
>not be able to conduct current during receive mode when the cathode bias
>relay contacts are open, which applies cut-off bias to the tube.
>Certainly, conduction is not possible by a means *inside* the amplifier.
>
> After the first article I wrote about vhf parasitics was published in *Ham
>Radio*, I began to get scattered reports of parasitic oscillations
>allegedly having taken place when the amplifier was sitting quietly with
>the tube cut off.   I asked many  people about this phenomenon.  There was
>only one scientificly-based explanation we could come up with.

>  (Someone
>suggested that any amplifier that exhibits occasional arcing on standby,
>can only be cured by an exorcism.)

Fortunately all the participants do agree that we're looking for
something more substantial than that: we're looking for a scientific
explanation that fits all the facts.

Standing on the sidelines and sorting through the evidence, here's what
it seems to say to me, so far, FWIW.

>
>A Geiger counter is a useful instrument for measuring background radiation.
>I own a Mada Devices, Inc. Geiger counter.
[snip]
> When high energy photons of radiation pass through a Geiger tube, the
>photons collide with atoms, and temporaritly knock electrons free.  The
>freed electrons become current carriers.   This causes current to flow
>through the tube and the meter
>basicly indictes the resulting current. If
>high energy photons can create current carriers by striking atoms within a
>Geiger tube, does it seem possible that high energy photons could create
>current carriers by strinking atoms within an amplifier tube?

I don't think so; and ionizing radiation is something I do know about.
Cosmic rays are passing through you, me and your PA tube at quite a
frequent rate, leaving small trails of separated electrons and positive
ions. Some of the electrons are energetic enough to create additional
electrons (secondary ionization) but most do not, so the overall effect
is usually that the trails of ionization recombine with very little
long-term effect. A Geiger tube is specially built to maximize the
effects of secondary electron multiplication, so that each ionized trail
creates a much larger shower of secondary electrons that is big enough
to register as a pulse. The conditions to achieve electron
multiplication are quite specific: the tube is filled with an ionizable
gas at a critically optimized pressure.

Such conditions do not exist in a normal vacuum tube. If there is a
transient effect that sends the tube into violent conduction, it's much
more likely to be due to a release of a micro-pocket of trapped gas, or
a flake of material falling off one of the electrodes. It doesn't seem
to be necessary to invoke cosmic rays to explain this.

>If this is
>possible, then the amplifier tube could conduct briefly without the cathode
>bias relay being closed.  Naturally a current pulse would cause the anode
>circuit to ring at its vhf self resonance, and a vhf parasitic oscillation
>just might be possible.

I'm open-minded on this, but we seem to be talking about a sudden arc-
over rather than a specifically vhf parasitic oscillation.

Jumping across to the other branch of this discussion that deals with
gold sputtering, I don't see how anybody - not even Eimac - can say that
sputtering effects "must have been" caused by vhf parasitic oscillation.
That kind of hindsight does not exist. All we know for sure is that the
sputtering was caused by heating, probably directly at the gold surface
of the grid wires rather than from the inside out. Large vhf currents
concentrated on the surface by the skin effect could be one cause of
surface heating; but not the only possible cause - see later.

Another piece of evidence, that doesn't fit in with intermittent vhf
parasitics being the cause of the sputtering problem in HF amps, is that
the 8877 and 3CX800 can be used all the way up to 432MHz, at and above
their rated maximum power. Yes, there have been a few tubes
catastrophically destroyed, but what'ya gonna blame for that - shf
parasitics?

The other main cause of surface heating in vacuum tubes is of course
particle bombardment. We can accept the evidence that incorrect
operating conditions will damage the grid due to over-dissipation
(excessive grid current), and obviously the worse this abuse, the sooner
the tube will fail. Maybe different mechanisms will be at work over
different timescales (seconds - hours - months) but this is all quite
different from the catastrophic mode of destruction where it's all over
in a small fraction of a second.  Those are two totally  different modes
of failure that really shouldn't be discussed together.

It seems reasonable to use electronic protection against damage caused
by incorrect operating conditions (grid currents up to maybe 10x the
rated value). But it's not reasonable to complain that the same circuit
doesn't protect against catastrophic damage (grid currents which Rich
estimates at say 15A).

So where does the catastrophic damage come from? If it's capable of
doing so much damage to the grid, even when the cathode is back-biased
in standby mode, it seems that the current must be sourced from the
anode.

Gary points out that electrons striking the grid from the cathode have
neither the mass nor the volts of accelerating potential to do much
damage. On the other hand, positive ions sourced from the anode would
have several thousand times the mass and an accelerating potential of
several kV - and all their impact energy is initially deposited on the
surface of the grid.

The original source of the ions could be de-gassing as I mentioned
earlier, but once the arc is running it would be self-sustaining. When
the neutral atoms at the anode dissociate, positive ions flow from anode
to grid (or screen in the case of a tetrode) and electrons flow the
opposite way.

Unless my notion of the physics of an arc is all wrong, the arc theory
seems to explain the available evidence without any need for rf
oscillations as well.

A final clue from Rich:
>I received a telephone call this morning from a fellow in Reno whose
>had a blown grid fuse resistor, but whose new tubes were undamaged.

New tubes? Isn't that suggestive of a little too much gas, resulting in
a liability to arc until the tubes are fully de-gassed by a few hours of
normal operation?


I'm not taking sides here - this has been a very high-quality discussion
among people whose expertise I greatly respect, even though they
disagree with one another! I'm just thinking aloud (or whatever the
Internet equivalent is), feeling my way forward and trying to piece
together a story that fits all the facts...


73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - world-wide.


From [e-mail] Fri Nov 08 21:59:07 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: PWM AM and SSB Linear amp questions
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <55dki5$[e-mail]> <55h8gl$[e-mail]>
Date: Sun, 3 Nov 1996 17:59:49 GMT
Lines: 23
Sender: [e-mail]

in <55h8gl$[e-mail]>, J. Fred Riley wrote:
: [e-mail] (Richard Hosking) wrote:
: > the idea is to apply this to a linear
: >SSB amp. The low level signal is limited and applied to the final amp
: >in class C while the amplitude info is "stripped off" and modulates
: >the final as above. ...

: We do this all the time in our shortwave transmitters.  Anode
: conversion efficiency exceeds 85%, modulator efficiency is 97%, and
: the IMD is easily -40 at 2,000 KW PEP.  The critical aspect is to
: match the amplitude response and phase delay of the RF signal to the
: transmitter's modulator--along with having a low-distortion modulator,
: of course. You will find may suitable phase/amplitude correction
: circuits to copy in any AM stereo exciter that can be scaled to your
: SSB generation frequency.

I can see how that would work with SSB with a full or reduced carrier
(H3E, R3E) but how can that work with supressed carrier (J3E).  Since
it's just the voice baseband translated up in frequency, there's no
domiant carrier and for things like the s sound, there's just noise.

Mark Zenier  [e-mail]  [e-mail]



From [e-mail] Fri Nov 08 21:59:09 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!super.zippo.com!zdc!szdc!szdc-e!news
From: [e-mail] (Robert Fowle)
Newsgroups: rec.radio.amateur.homebrew
Subject: JUST A NOTE FS/TRADE LIST (357 LINES)
Date: Sun, 03 Nov 1996 18:04:12 GMT
Organization: The HAMMARLUND Historian
Lines: 35
Message-ID: <[e-mail]>
X-Newsreader: Forte Free Agent 1.1/16.230

Hi gang;
        well it's been hecktic the last few days, the father-in-law in
hospital
agin this year, last had his left lung removed, this year his right
kidney...
touch & go...wife in a turmoil...
        ANYWAY,  the list i posted here, is doing good,
but,  Remember.....this is stuff i don't want/need....make offers..
there is a small list of items i'd trade for included, although it's
not the only stuff i'd trade for......this suff takes up a lot of
room/space....it wouldn't hurt my feelings if someone took it
all...(that would be a pick-up for sure)
        IF you think a price is out of line...think " I'll make an
OFFER"
as long as it's a reasonable....you can't insult me....
        thanks for the space, if you want the list again, or would
like it for the first time, email me.....remember it's parts &
some equipment..etc.

thank you

=================================================]-[->
Robert Fowle      KC8DBC
The HAMMARLUND Historian
Ph. 517-789-6721
1215 Winifred
Jackson, Mich. 49202-1946
E-mail:  [e-mail]
Web Page:  http://www.jacksonmi.com/hammarlund
                 HAMMARLUND LITERATURE WANTED
WANTED: MANUALS FOR ANY MAKE RADIO EQUIPMENT
=================================================]-[->
Boatanchors: the list: [e-mail]......subscribe boatanchors <your
name>
       the news group: rec.radio.amateur.boatanchors
             news group: ham-am@[e-mail]....Body: add ham-am


From [e-mail] Fri Nov 08 21:59:10 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood TH-28a mod - th28.doc (0/1)
Date: Sun, 03 Nov 1996 18:39:04 GMT
Organization: Customer of PING - Personal InterNet Gate
Lines: 10
Message-ID: <55iord$[e-mail]>
References: <[e-mail]>
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Vince Curtis <[e-mail]> wrote:

>Does anyone have info about modifying this unit ? Please help. Thanks-
>Vince

hi, hope thi help.

vy 73 - Karl from AUSTRIA




From [e-mail] Fri Nov 08 21:59:11 1996
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From: K.S.
Newsgroups: rec.radio.amateur.homebrew
Subject: FT-1000D- Jumper Mod ?
Date: Sun, 03 Nov 1996 19:11:10 GMT
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Lines: 11
Message-ID: <55iqnj$[e-mail]>
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Hi

Any comment for the jumper on the CNTL-Unit ???

What do this Jumper ( Jumper 3 is for general TX)

Thank you






From [e-mail] Fri Nov 08 21:59:12 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 03 Nov 1996 12:15:09 -0700
Organization: Internet Access of Ventura County
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]> <55isek$[e-mail]>
NNTP-Posting-Host: port3.vcnet.com

In article <55isek$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
snip...
> There seems to be another basic problem with the gold theory you offer.
> You seem to thing the gold has to boil for material to be lost, but that
> is totally untrue.
>
 It does not seem to be just a theory, Tom.  I took a look at a
gold-sputtered grid through a microscope.  It could see that gold had
bubbled and evaporated.  The plethora of gold melt balls I saw on the
cathode could only have been formed from condensed gold vapour.

 I do not deserve credit for the vhf-uhf-parasitic/gold-sputtering
theory.  It originated at Eimac.   I am only the messenger.
-----------------------
e-mail copy to Mr. Tom Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:59:13 1996
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From: [e-mail] (jgoedh)
Newsgroups: rec.radio.amateur.homebrew
Subject: add
Date: 3 Nov 96 19:34:58 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

add ham-homebrew


From [e-mail] Fri Nov 08 21:59:14 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 14:40:04 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>rectanglular grid wires face the cathode, so heat transfer is minimal.
>Another factor is that gold is excellent for not absorbing infrared
>radiation.

Hi Rich,

There seems to be another basic problem with the gold theory you offer.
You seem to thing the gold has to boil for material to be lost, but that
is totally untrue.

Materials have a bonding action that keeps them from falling apart, but if
any individual atom has an energy level that exceeds the bonding potential
an atom can leave the lattice or its' neighbors. This occurs in a solid,
as well as a liquid. Water doesn't simply sit there and not evaporate
until it boils, and neither does gold.

The energy of the electrons striking the grid is expressed in volts, and
the number of them striking the grid is expressed in amperes. When the
electron stikes the gold, it has to impart its energy on the gold, aand
that raises the energy level of the particular atom it strikes. If the
increase in energy level is sufficent the atom will "evaporate" from the
surface, even if the rest of the surface is very cold.

Why is it so surprising the material on the grid eventually deteriorates
over time and migrates to other areas of the tube, or that short term
heating accelerates this process and damages the tube? Why is it OK for
this to happen in the cathode (without the materials in it "boiling" or
even becoming a liquid) and not in the grid?

As a matter of fact, the cathode life of a MOX cathode power grid is
primarily a function of filament hours at a given temperature UNLESS a
safe emission reserve margin is exceeded. A thoriated tungsten tube is
strictly a function of filament hours and temperature and are not damaged
by emission saturation. Material from the filaments and cathodes slowly
vanish, yet by the "rules and explainations" you offered for the grid this
shouldn't happen...  unless we boil the cathode.

I'm puzzled at the large difference between known published physics and
science and your theories. For example, the quantum energy of a photon
must be billions of times larger than they tell us for the effect you
describe in a tube from photon bombardment to occur. Are hundreds or
thousands of reference textbook (dealing with physics and electronics
theory) authors involved in a sinister plot to mislead us all?

73 Tom


From [e-mail] Fri Nov 08 21:59:15 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!ott.istar!istar.net!news.nstn.ca!news.dal.ca!chebucto.ns.ca!ag722
From: [e-mail] (Chris Findley)
Newsgroups: rec.radio.amateur.homebrew
Subject: mods 4 ext RX/TX IC2GXAT????
Date: 3 Nov 1996 20:00:35 GMT
Organization: Chebucto Community Net
Lines: 11
Message-ID: <55itl3$[e-mail]>
NNTP-Posting-Host: chebucto.ns.ca
X-Newsreader: TIN [version 1.2 PL2]

Anyone know where to find the info/docs for an extended RX and TX mod
for the Icom 2GXAT handheld tranceiver???? I've already completed the
"keyboard fix" for extended RX capability but I have need of the extended
TX ability out of band. As far as I know there is no 'keyboard fix' for
the TX mod.


Thanks a mill.
VE1UNI
[e-mail]
--


From [e-mail] Fri Nov 08 21:59:16 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 15:14:17 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 75
Sender: [e-mail]
Message-ID: <55iuep$[e-mail]>
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>Initially, I was also puzzled by the seeming ease with which a VHF
>oscillation can arc over a tune capacitor with a much higher HF peak
>voltage rating than is required for the amplifier.

That's another mistake. You seem to think the peak anode voltage can only
be 2Ep, but that is totally untrue. The peak HF anode voltage can be much
greater than 2Ep.

>However, capacitor
>plates are arcing/melting too often to ignore.  One possible explanation
>is that VHF and especially UHF voltage is not like 60Hz voltage.

How did we get to 60 Hz?

Rich, you never answered or commented about the fact we just have a simple
pi network between the tube and the tank input. We can look at that
circuit with simple test equipment and end all the guessing. Let's take a
typical case of a production AL-80B.

I just coupled a constant voltage signal to the AL-80B 3-500Z anode, and
here's what I measured (the band switch was set to 20, but it made no
almost difference in readings above 35 MHz what band the tank was set
for). The voltage at the anode was 800 mV. The readings are described as
mn=min obtained , r= 20 mtr resonant point, mx= maximum obtained as the
tuning cap is rotated through it's range. Voltages are measured across the
tank cap. Values are in mV.

500 MHz 12 for all settings
400 MHz 14 for all settings
300 MHz 22 for all settings
200 MHz 45 for all settings
175 MHz ~60 for all settings
150 MHz 85 mx, 6 mn, 32 r
140 MHz 15 mx, 5 mn, 5 r
130 MHz 80 mx, 3 mn, 3 r  (resonant point of grid)
120 MHz 33 mx, 14 mn, 18 r
110 MHz 34 mx, 2 mn,  17 r
100 MHz 130 mx, .2 mn, 30 r (resonant point of anode)
90 MHz   140 mx, 1.5 mn, 35 r
80 MHz   210 mx, 10 mn, 70 r
70 MHz   280 mx, 15 mn, 70 r
60 MHz  400 mx, 18 mn, 73 r
50 MHz   500 mx, 19 mn, 74 r

The voltage increases at a linear rate until at 20 MHz it reaches 800 mV
max.

I wonder if you could explain how a VHF or UHF signal at the anode could
cause the capacitor to arc, since the voltage step down is about 25 to one
at the resonant frequency? Can the anode and plate choke withstand 87.5
kilovolts?

By the way, the bandswitch voltage was lower yet, about 30% lower.

>Here's an AC theory question, Tom.  Do think it is possible to take
>120V/60Hz and make 10,000V/60Hz with one capacitor and one inductor?

Absolutely, if the Q is high enough, the components are in the right
positions, and they have the correct value. Now here's a question for you.
Do you suppose they would make 10,000 volts if the circuit was like this:

source-- - shunt 100 ohms  ---L series 100 ohms in shunt with 218 ohms
r---- -shunt 32 ohms--output

Do you think we would get 5 KV at the output if we applied 5 kV at the
source? 10 kV?

The "parasitics cause the tuning cap to arc" is just another wild claim
that holds no technical merit at all when the facts are examined, just
like the gold on the grid.

73 Tom


From [e-mail] Fri Nov 08 21:59:17 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 15:14:31 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
Message-ID: <55iuf7$[e-mail]>
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>
>The VHF ringing signal in the anode resonant circuit is fed back to the
>cathode input by the anode-to-cathode feedback capacitance of the tube.
>The VHF feedback is positive because the HF tuned output and HF tuned
>input are not even in the picture at VHF.

The output and input shunt reactances are very much in the picture at VHF.
Use your calculator, or borrow an RF impedance meter.

If you pick a frequency, I'll measure the phase shift and loss in the
feedback path. We can calculate the tubes gain under the best condition.
Or better yet, do the experiment along with me.

73 Tom


From [e-mail] Fri Nov 08 21:59:18 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 15:14:31 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 74
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For Gary, KE4ZV

Don't overcomplicate grid dissipation Gary. It's given simply as the
voltage times current at any given instant of time, and the resulting
average value of dissipation over time. I explained the calculation. It is
approximated by taking the average voltage grid to cathode voltage over
the portion of the cycle when the grid is positive compared to the cathode
(you can use a polarity sensitive and dc biased RMS RF voltmeter to
measure this), and the average current (which is measured for you on the
meter).

In a grounded grid amplifier, with the anode mistuned, negative feedback
is removed and both the duty cycle of the grid and grid to cathode voltage
(and hence current) increases.

At 150 mA of grid current in a typical HF PA, a single 3CX800 has a
measured grid dissipation of almost 20 watts. That's almost 5 times the
maximum rated dissipation of the grid.

And yes, it will cause the gold to ball up, evaporate and even flake off.
And yes, Eimac will confirm this.

In article <[e-mail]>,
[e-mail] (R.L. Measures) writes:

> After the first article I wrote about vhf parasitics was published in
*Ham
>Radio*, I began to get scattered reports of parasitic oscillations
>allegedly having taken place when the amplifier was sitting quietly with
>the tube cut off.   I asked many  people about this phenomenon.  There
was
>only one scientificly-based explanation we could come up with.  (Someone
>suggested that any amplifier that exhibits occasional arcing on standby,
>can only be cured by an exorcism.)

Now the amplifier will oscillate with the tube cut off. Here come the
things from outer space that turn the PA on by themselves.

Never mind the poor guy had a gassy tube, it still has to be explained as
a parasitic! This time the evidence is a Geiger-Muller tube clicks.
Unfortunately Rich:

1.) The Geiger-Muller tube must be filled with gas (argon and ethyl
alcohol) or it won't "tic"

2.) When it does "tic" the current is 5x10-14th amp for ten particals per
second with each particle loosing 1 MeV.

3.) The "tic" is ion movement, not electrons. The tic is from a current of
less than a pico-ampere.

Rich, how many 1000v relay contacts do you think would arc from a current
of .00000000000005 amperes? How long does it take .00000000000005 amperes
to charge up all the .01 caps (two to the input circuit, two to ground for
a total of .04 uF) enough to allow the relay to arc over? How many photons
are required to cause that current in a near perfect vacuum? Is a 3-500Z
tube filled with argon and ethyl alcohol?
Do people have atomic reactors in the PA? Perhaps a dose of  >10000 rems
for a few seconds would make the relay arc if the tube was gassy, but the
operator wouldn't care. He'd die anyway.

Why don't photons from the normal electromagnetic energy in the tube cause
it to arc?

If you can overcome these problems, you may have finally hit on a true
theory.
Rich wrote:

>QST would not allow the mention of background radiation in "Parasitics
>Revisited" (QST, Sep./Oct. 1990)

Thank goodness. No small wonder.

73, Tom


From [e-mail] Fri Nov 08 21:59:19 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 15:14:32 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 63
Sender: [e-mail]
Message-ID: <55iuf8$[e-mail]>
References: <55g2ip$[e-mail]>
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In article <55g2ip$[e-mail]>,
[e-mail](Jeff Anderson) writes:

>
>    I don't understand why no-one hasn't contacted Eimac (Varian)
>regarding the gold-sputtering issue.  Rather than argue the physics
>back and forth, couldn't this issue be settled, quickly and simply,
>with a phone-call or two to the experts?  Somebody there must have a
>handle on this problem.
>
>    The 8877 is manufactured in Salt Lake City.  Their number is
>801-972-5000.  The San Carlos (California) number is 415-592-9988.
>
>- Jeff, WA6AHL
>
>
Please don't pile them up with calls, they are sick of this stuff. Here is
Eimac's reply to me on that very question Jeff.

>>
Subj:   3CX800A7
Date:   96-10-31 13:21:43 EST
From:   [e-mail]
To:     [e-mail]

Hi, Tom. I hear you are in conversation with Rich Measures.
To answer your question regarding the 3CX800A7, this tube uses a grid made
from material which has a high melting point (Molybdenum or Tungsten)
plated with gold.  If one over drives this tube or operates it at high
grid current due to improper loading or failure in the matching network or
load, then it is likely that the temperature of the grid will quickly,
within seconds, become high enough to vaporize the gold.  This may be what
happened to the 8874 tubes that Measures returned to Eimac a long time
back and Bill Foote, then responsible for writing letters related to
returned products, wrote something about a microwave oscillation that we
saw IN ANOTHER PRODUCT, maybe he did not make that distinction, but to
this day Measures believes that the incidence of failures with gold
evaporated from grids are entirely due to parasitic oscillations, and
tries to hold this letter from Mr. Foote as evidence.  This is bunk. I
trust that is what you are discussing with Measures?  May I suggest that
you make your life more enjoyable, do something else than arguing with
Measures.


----------------------- Headers --------------------------------
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So they appear to think the theory is bunk, and agree with my analysis.

73 Tom


From [e-mail] Fri Nov 08 21:59:20 1996
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From: "Bill Frovik" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: info on 1.2 gig pre amp 20 db or more
Date: 3 Nov 1996 22:02:10 GMT
Organization: Preferred Company
Lines: 6
Message-ID: <01bbc9a8$67c6ef80$[e-mail]>
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X-Newsreader: Microsoft Internet News 4.70.1155

need info on a good pre amp for 1.2 gig atv.. other than that dam radio
shack
one..
thanks
 n0mnb
bill


From [e-mail] Fri Nov 08 21:59:21 1996
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From: [e-mail] (Tom Swisher)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: Yaesu FT-73 mods
Date: 3 Nov 1996 17:04:29 -0500
Organization: The Greater Columbus FreeNet
Lines: 24
Message-ID: <55j4td$[e-mail]>
NNTP-Posting-Host: login.freenet.columbus.oh.us
Keywords: Yaesu, modification, radio
X-Newsreader: TIN [version 1.2 PL2]

Hello all;

I've got a Yaesu FT-73 that, like it's newer siblings, uses "add/remove
Jumper" type modifications to alter various aspects of the operation of
the radio. This particular unit has been modified so that the display
shows "CH 1" "CH2" "CH 3" and so on for memory channels, as would be
found on the commercial "Vertex" version of the FT-73, rather than the
frequency in the main window and the channel number in the upper left
corner of the display, as is normally found on the amateur version FT-73.

Does anyone out there have a list of the various jumper assignments for
the FT-73? I'd like to restore the display to it's proper state for
amateur use.

Thanks,

Tom Swisher, N8GQK


--
**********************************************************************
Tom Swisher, N8GQK                  | E-mail:
The Ohio Railway Museum             |  [e-mail]
"Save Our Roads.. Ship It By Rail"  |  [e-mail]


From [e-mail] Fri Nov 08 21:59:23 1996
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From: Bob Doyle <[e-mail]-FOR-EMAIL>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 15:11:01 -0700
Organization: Primenet Services for the Internet
Lines: 52
Message-ID: <[e-mail]-FOR-EMAIL>
References: <[e-mail]> <55dbja$[e-mail]> <[e-mail]> <[e-mail]-FOR-EMAIL> <[e-mail]>
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R. L. Measures wrote:
>
> In article <[e-mail]-FOR-EMAIL>, Bob Doyle
> <[e-mail]-FOR-EMAIL> wrote:
>
> > Guys,
> >
> > [Interrestion discussion about stability snipped]
> snip
> > Second thought.  I've never designed a tube power amplifier but I have
> > some experience designing with CRT tubes.  CRT tubes arc over on
> > occasion.  In an effort to improve the robustness of an problematic
> > airborne CRT display we decided to make measurements of a CRT arc in
> > process.  We used a pulsed welding laser aimed at the electrodes inside
> > the neck of the tube to facilitate an arc.  When we fired the laser, we
> > would create a conductive plasma from the vaporized electrode metal and
> > an arc would ensue.  One thing that became evident is that the di/dt
> > from an arc in a vacuum is much higher than the di/dt from an arc in
> > air.  Indeed sub nanosecond current risetimes were observed.  VHF
> > ringing was also observed in the anode wiring.  Just wondering if this
> > could explain VHF excitation
> > of the output network.
> >
> > Bob Doyle
> > WA3TGF
> ---------------------
> Interesting account, Bob.  I think it could explain one mode of VHF
> excitation in HF amplifiers.  The faster the risetime of the conduction
> cycle, the better the VHF resonances ring.  If the VHF resonant circuit is
> connected to a high VHF-gain amplifier tube, oscillation seems like a
> possibility.
>
> VHF and UHF parasitics are more common that most engineers seem to realize.
> A company that manufacturers argon-arc movie theatre projector-bulbs, was
> experiencing occasional, premature projector-bulb failure.  The cause was
> traced to an internittent UHF parasitic oscillation.  The bulbs were
> redesigned, and the problem went away.  The mechanism that started the UHF
> oscillation was somewhat mysterious because the bulbs operate on DC.
>
> Bob, is it true that aircraft encounter higher levels of background
> radiation at high altitude?  Did your news server carry my recent post on
> the subject of background radiation?

I've never received a satisfactory explanation of why such events happen
but I don't get the feeling that it is related to background radiation.
If it matters, this particular display was surrounded by a pretty
substantial mu-metal shield.  The only consensus I got from our experts
was that these events "just happen".  "You might as well design the
electronics to withstand them."  Oh well...

Bob Doyle
WA3TGF


From [e-mail] Fri Nov 08 21:59:24 1996
From: Jay123a <[e-mail]>
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Subject: Re: Just try this, it will work
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This has to be bogas, the e-mail address doesn't work.

Get a jaob slick.

Jay



From [e-mail] Fri Nov 08 21:59:25 1996
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From: [e-mail] (CraigIvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: 6-meter CW
Date: 3 Nov 1996 17:34:20 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
Message-ID: <55j6lc$[e-mail]>
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Is there a kit around that I can build for 6-meter CW?  If so, where can I
get it and how much?

Please reply via e-mail.

Thanks,

Craig
KC5UMA


From [e-mail] Fri Nov 08 21:59:26 1996
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From: [e-mail] (PAULINO Jean-Philippe)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tone decoder
Date: 3 Nov 96 23:56:43 GMT
Organization: ucsd usenet gateway
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I'm looking (for a repeater project) for an IC which can decode ZVEI, CCIR,EEA
,
EIA selcall Tones.
Many thanks. 73 from F1TMY

[e-mail]



From [e-mail] Fri Nov 08 21:59:27 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tube info
Date: 4 Nov 1996 00:37:23 GMT
Organization: Curmudgeon at Large
Lines: 21
Message-ID: <55jds3$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ocean.connix.com
X-Newsreader: IBM NewsReader/2 v1.2.5

In <[e-mail]>, [e-mail] (Stiles D Danie
l) writes:
>
>Does anyone have tube substitution information  for the following two
>tubes?
>
>6AU6
>and a 6EA6
>

From Sams Tube Substitution Handbook #17 (1974 or so)

6AU6 -- Try 6AU6A, 6BA6, 7543, 6AW6, 6AG5, 6BC5
            6BC5,  6CB6, 6CB6A, 6CE5, 6CF6,
            6DE6,  6DK6

6EA6 -- No substitutes listed



P.J. "Josh" Rovero       email:  [e-mail]



From [e-mail] Fri Nov 08 21:59:28 1996
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From: Bill C <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: MC145170 designs
Date: Sun, 03 Nov 1996 19:56:41 -0500
Organization: The Internet Ramp
Lines: 5
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Motorola's page:

http://www.mot.com/

    Bill  KU8H


From [e-mail] Fri Nov 08 21:59:29 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP homebrew list
Date: Mon, 04 Nov 1996 01:02:08 GMT
Organization: MindSpring Enterprises, Inc.
Lines: 23
Message-ID: <55jeu0$[e-mail]>
References: <[e-mail]> <[e-mail]>
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Stephen Wandling <[e-mail]> wrote:

>I am interested in Homebrew.  Homebrew anything.  It's something that I
>can provide some helpful information on at times.  Kits are not
>homebrew. My own take on QRP is that it's small, cheap, portable and
>doable.  I've had this fantasy of camping on some mountain ridge, with
>my antenna strung in the alpine firs, snug in my sleeping bag, tapping
>away to someone sitting in their shack in town.

>Is there more than that?
------------------------------------------------------------------------------
-------------------------------------
You have found nirvana.  Radio nirvana at least. How many find
that in ANYTHING these days..or have the focus to bother?
They could have used you on that flight that crashed in the Andes
(survival) where they tried to get that radio going.

I have plans to use the VCO output of a 2010 sony to make a
"buddy 2010 Xmitter". QRP naturally.
 - Tony WW2W
p.s. - I have to post "looking for 2010 service manual 1st" - any
ideas/comments on this?




From [e-mail] Fri Nov 08 21:59:30 1996
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From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: info on 1.2 gig pre amp 20 db or more
Date: 3 Nov 1996 17:55:48 -0800
Organization: BEST Internet Communications
Lines: 15
Message-ID: <55jif4$[e-mail]>
References: <01bbc9a8$67c6ef80$[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <01bbc9a8$67c6ef80$[e-mail]>,
Bill Frovik <[e-mail]> wrote:
>need info on a good pre amp for 1.2 gig atv.. other than that dam radio
>shack
>one..
>thanks
> n0mnb
>bill

You might try Down East Microwave or one of the many roll your
own designs in the ARRL handbook and microwave handbook.
There are no special "made for ATV" designs.

Steve M.   WF6R



From [e-mail] Fri Nov 08 21:59:31 1996
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From: [e-mail](Richard K. Adkins)
Newsgroups: rec.radio.amateur.homebrew
Subject: Feedback wanted.....
Date: 4 Nov 1996 02:21:16 GMT
Organization: Netcom
Lines: 8
Message-ID: <55jjus$[e-mail]>
NNTP-Posting-Host: stp-fl3-07.ix.netcom.com
X-NETCOM-Date: Sun Nov 03  6:21:16 PM PST 1996

Anyone out there have any feedback on the Ramsey kits? I just put
together one of their QRP 80 meter receivers; it works OK (for what it
is), but when I get that General class license in a few months I'll be
wanting some better equipment. Any suggestions on which way to go (kit
vs. ready-made, etc)? And where can I find info on kits? Ramsey is the
only company I've found so far......
Thanks....



From [e-mail] Fri Nov 08 21:59:31 1996
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From: Robert Newland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ham page
Date: Sun, 03 Nov 1996 19:41:23 -0800
Organization: The Why? Network
Lines: 2
Message-ID: <[e-mail]>
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visit the tired old mans page at http://www.why.net/home/robtnew for ham
links and sports and more!


From [e-mail] Fri Nov 08 21:59:32 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED mod for adi 2 meter radio !!
Date: Mon, 04 Nov 1996 04:20:25 GMT
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From [e-mail] Fri Nov 08 21:59:34 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 23:46:41 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 90
Sender: [e-mail]
Message-ID: <55jsfh$[e-mail]>
References: <[e-mail]>
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X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>Even a stable amplifier produces internal, weak, damped wave VHF ringing,
>Jeff.  Here's why:
> An  L/C resonant circuit is like a bell.  Strike a bell with a hammer
and
>it rings, producing a damped wave oscillation.  Shock excite an L/C
>resonant circuit. with a current pulse and it rings, very much like a
>bell, producing a damped wave oscillation.  The magnitude of the
>ringing-voltage is proportional to the Q of the L/C circuit.  Therefore,
Q
>is probably an important consideration when designing an oscillation
>suppressor/dampening  device.

That's not entirely true. In a tank, as in a Bell, the peak voltage
developed during the ringing can not exceed the level of the single pulse
that drove the Bell.

The effect is very much like a pendulum, one perfect tug and at the very
most the voltage equals the voltage delta of the tug.

If the tube "pulls" the voltage low in step with the resonant frequency
over and over again, and losses do not exceed the energy supplied by this
"pull", voltage can build up. It builds (and as it does losses also
increase) until equilibrium is reached between energy applied and energy
lost.

In no case is the bell or tank an amplifier or multiplier of energy,
although it is a simple energy storage system.

>A change in DC current is enough to cause
>ringing, albeit at a lower amplitude than when greater changes in anode
>current are used.  There is no RFI problem because the weak, VHF ringing
>signal can not pass through the HF tank and reach the antenna.    A
>problem only occurs when the weak ringing signal happens to get
amplified,
>fed back, re-amplified, on and on.  Bang!   I don't have a clue as to
what
>phase, current, and voltage relationships between the input and output
>signals are required to cause a full blown parasitic oscillation to take
>place.  Full blown parasitic oscillations typically take place only
>rarely.

This is where the theory falls apart (just as the gold migration
explaination did), here's why.

If the stage has enough feedback to sustain oscillation, it will start on
it's own. Gain of any tube is highest when the anode impedance (E/I) is
highest, and the grid impedance is highest (E/I). As soon as any tube has
the plate current or grid current increase, gain drops. (You can confirm
this on your PA at home by driving the PA with low power, tuning for
maximum power, and measuring the gain. If you apply more power, tune for
maximum power, and measure the gain, it will be less.)

When a stage oscillates and causes grid current or increased anode
current, gain decreases. When the stage is driven with fundamental RF,
gain decreases.

>I have never said that lowering the Q of a parasitic suppressor will Stop
>parasitic oscillations forever.   It has been my experience, and the
>experience of others, that parasitic oscillations are less likely to
occur
>with lower Q suppressors.  When lower Q suppressors are combined with
>suitable glitch-protection diodes and resistors, if perchance a parasite
>appears, damage is usually limited to cheap diodes and resistors instead
>of uncheap tubes and meters.

The giant leap from dampened ringing (which really is a simple frequency
response peak) to damaged meters and diodes is hard to understand. So far,
nothing has indicated the suspected violent oscillations occur or even
could occur, and every bit of damage described can have multiple cuses not
related to parasitics.

It sounds like we are grasping at straws to blame every single problem
from meters to tubes on something we can't see or measure, rarely occurs,
and makes little technical sense when analyzed.

I'd like an explaination of HOW a VHF signal can produce many kilovolts
across the low reactance of the tuning cap, while lower frequency signals
(where the reactance is higher) can't. How the system can operate happily
for days or years without a failure, and suddenly go unstable. How the
gold can be damaged only by a very brief VHF signal, when the heating is
not even related to skin effect.

We haven't even done that, and now we've added the meters and diodes to
the components damaged by parasitics. Hopefully if the plug falls out of
the wall it won't be from a parasitic.

73 Tom


From [e-mail] Fri Nov 08 21:59:36 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 3 Nov 1996 23:50:38 -0500
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>
>Maybe some of the people who have installed lower Q suppressors should be
>polled to see what their experiences are?

If we poll people who wear copper bracelets, we'll find the majority will
claim their health has improved. If they didn't believe, they wouldn't
wear the bracelet. :-)

73 Tom


From [e-mail] Fri Nov 08 21:59:37 1996
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From: [e-mail]
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 4 Nov 1996 06:00:06 GMT
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In article <[e-mail]>
[e-mail] wrote:
>
> What you are missing is this: Suppose your supply
> voltage is Vcc, and you biased the collector at Vcc/2.
> So DC collector current is then Ic=Vcc/2Rc  where Rc is the
> collector resistor.
>
> Now small signal transconductance, gm of the transistor is:
> gm=q Ic/kT,  so if the voltage applied to base is v1, the change
> in the collector current is :
>
> ic= gm v1
>
> and
>
> collector voltage vc :
>
> vc= - Rc ic  or  if you combine all the eqs. above
>
> vc= -Rc q Ic/kT v1
>
> now if you replace Ic with Vcc/2Rc, the output voltage becomes
> independent of Rc!
>
> vc=-q Vcc/2kT v1, or the gain is: -q Vcc/2kT! no collector
> resistor dependence...
>
> Meric
> [e-mail]

Meric,

I agree with you, however some points NEED clarification.
If in your case you specified that the collector voltage was
held FIXED at Vcc/2, INDEPENDANT of Rc, then your
statements of gain being independant of Rc would be true.
But if this were the case you would have effectively
turned your collector resistor into a CURRENT SOURCE.
By that I mean changing the resistor value incrementally
has the effect of changing the collector current incrementally,
ie changing the operating point.  Your original statement
did not include any of the important biasing details.

If the transistor is biased by forcing a particular BASE/EMITTER
VOLTAGE, ie the collector current is relatively independant
of Rc, then you have simply identified a case where your
equations are correct.  But the claim that gain is independant
of Rc is NOT correct, and is misleading.  As proof of concept
I suggest that you now incrementally change the Rc value
to Rc+r.  No longer is the collector voltage equal to Vcc/2,
and guess what, the magnitude of the gain is now gm*(Rc+r)!
(yes I am ignoring Va effects here for simplification).  By this
I mean that the operating point is determined by a forced
base/emitter voltage, perhaps by a simple voltage divider.

So as I would summarize, If the transistor is biased from a
current source and the collector voltage is set by some sort
of feedback mechanism, the gain  (which is ALWAYS gm*R),
of that stage is pretty constant ONLY if the Ic (gm) is inversely
related to a change in R.  gain=gmR gain=gmR gain=gmR.

I apologize in advance if I have overstated the obvious,
however when I read your analysis of gain independant of Rc,
I felt that some additional details should have been more
explicitly stated to support your claims.

EM



From [e-mail] Fri Nov 08 21:59:38 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Thomas G. McWilliams)
Subject: Re: QRP homebrew list
Message-ID: <[e-mail]>
Organization: Jot-Em-Down Store and Library
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[e-mail] wrote:
: I have plans to use the VCO output of a 2010 sony to make a
: "buddy 2010 Xmitter". QRP naturally.
:  - Tony WW2W


Keep us posted. That sounds like a neat little project--automatic
TX muting and antenna switching would be nice too . . .



From [e-mail] Fri Nov 08 21:59:39 1996
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From: "David Byington" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: mods for kenwood tm241 2 meter ???
Date: 4 Nov 1996 07:16:44 GMT
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Are there any mods for the kenwood TM241 2 meter riadio.  if so post or
email [e-mail]



From [e-mail] Fri Nov 08 21:59:40 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 4 Nov 1996 02:59:53 -0500
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In article <[e-mail]>, [e-mail] (Wes
Stewart) writes:

>
>Fools rush in...
>
>Gentlemen:  Regarding the temperature rise in the grid structure, have
you
>considered that the grid is very near the cathode and is running at an
>elevated temperature even without additional dissipation.
>
>Mind you, I don't have a clue as to the actual spacing or the cathode
>temperature in this tube.  Just asking.
>
>73, Wes -- N7WS

Hi Wes,

If you read back through this mess you'll see I pointed that out early on.
I just made the comment in passing, but it is an important effect.

Eimac does factor that into the grid dissipation rating they give, so
there is no need for the designer to consider it. The assume in the real
world of PA's that the operator has the heater on.

Of course, I wouldn't be amazed if someone said THAT wasn't true. ;-)'

73 Tom


From [e-mail] Fri Nov 08 21:59:41 1996
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From: [e-mail] (CommQuart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 4 Nov 1996 03:32:28 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <55iuf7$[e-mail]>, [e-mail] (W8JI  Tom)
writes:

>And yes, it will cause the gold to ball up, evaporate and even flake off.
>And yes, Eimac will confirm this.

Pardon my ignorance in this matter, but I am curious....
So what if the gold boils/sputters/leaves-for-Florida??  I assume
the remaining grid structure is still metallic, and should still
function?

Pete K1ZJH


From [e-mail] Fri Nov 08 21:59:42 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 4 Nov 1996 03:38:34 -0500
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>
> I do not deserve credit for the vhf-uhf-parasitic/gold-sputtering
>theory.  It originated at Eimac.   I am only the messenger.

Hi Rich,

Eimac claims you are mistaken, and have distorted a letter written by
someone assigned to answer customer service letters. Anyone with a first
year physics book can see how unplausable that theory is, and Eimac even
states the damage is excessive grid current caused, and the only case of
that they had was in very large transmitting tubes for UHF, and the
oscillation was microwave heating of the grid.

If we can move beyond that, I'd like to hear why you think a resistor
makes a good fuse for a control grid. No big stories are necessary, just
the facts about failure time (until the resistor opens) vs amount of
overload.

I need help understanding that postulation. I've always understood
electronic overloads are much faster than fuses (which are notoriously
unreliable), and I've never seen anyone suggest using conventional
resistors as fuses for delicate devices.

Unless you'd rather clarify the arcing tuning capacitor. That's another
area that makes no sense.

73 Tom


From [e-mail] Fri Nov 08 21:59:43 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 4 Nov 1996 03:43:03 -0500
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>As close as I can remember, the cathode to grid driving voltage for a
>3CX800A7 is around 40V RMS.  150mA times 40V is 6W.  Does it seem likely
>that a steady 6W is going to raise the temperature of the grid structure
>to over 2000 degrees F?

My posts take a while to appear, the system I use is slow.

You don't seem to understand how to calculate grid dissipation Rich,
please read this carefully.

Grid dissipation is given simply (as is the anode dissipation at any given
instant of time using Epk*Ipk) by the grid to cathode voltage while the
grid is conducting.

When the output circuit is proper loaded in a gg amp, negative feedback
occurs. This feedback lowers the g/k voltage. In this condition, the
effective RMS grid voltage is lower.

If the PA is anode is underloaded (too high a load impedance presented),
negative feedback is removed and the g/k voltage and current soars. This
happens rapidly with small changes in load impedance with tubes like the
3CX800, and slower in low mu triodes. That's one reason why low mu triodes
are prefered in PA's with unstable loads.

So your voltage assumption, like so many others, does not hold true in
practice. It not only isn't the correct g/k voltage in the untuned
condition, it is wrong in a properly loaded PA.

The effective g/k RMS voltage of a single 3CX800 in a PA I actually
measured (as part of a routine design proceedure) was over 100 volts when
the stage was mistuned enough to allow 150 mA of grid current to flow at
full exciter power.

You seem to be ignoring several circuit parameters, like conduction angle
of the g/k path. It is less than 180 degrees, so the voltage is higher
that it seems at first glance because the peak current is also much higher
than the meter indicates.

Please read the copy of correspondence from Eimac that I posted, they also
claim (as I do) that the damage is commonly and most likely from improper
load or loading of the PA.

73 Tom,


From [e-mail] Fri Nov 08 21:59:44 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: 4 Nov 1996 03:43:37 -0500
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In article <55gpdt$[e-mail]>, [e-mail] (Ron Angle)
writes:

>
>I would appreciate input from anyone who has used separate relays for the

>input and output on grounded grid linear amplfiers (as opposed to using a

>single DPDT relay). Is there a problem if two separate relays do not
close
>simultaneously?

Yes, the output relay MUST close first and release last, or you can ruin
the bandswitch or other components (including the output relay).

73 Tom


From [e-mail] Fri Nov 08 21:59:44 1996
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From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tubes date needed
Date: 4 Nov 96 10:30:55 GMT
Organization: Siemens AG, Public Communication Networks, Munich Germany
Lines: 16
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NNTP-Posting-Host: mail.ucsd.edu
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Hello,

please help me to find the datas of the following tubes:

    6KG6 / EL509
and PL509

These tubes are cheap and used for a small short wave amplifier.

Please respond to the mailing list as well as to my private address.

vy 73, Guenter, DL4MEA=40DB0KCP.=23BAY.DEU.EU   (AX.25)
                dl4mea=40amsat.org            (Internet)
                http://www.scn.de/=7Ekoellner (WWW)



From [e-mail] Fri Nov 08 21:59:46 1996
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From: [e-mail] (Tom Wagner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Mon, 04 Nov 1996 11:19:43 GMT
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I tried Measure's lower Q suppressors.  It didn't help my
SB-220's intermittant "arcing".  I changed the
grid circuit to 6 wide ground straps, and that
*seemed* to help.

A couple of weeks ago the amp started arcing
at power on, every time.  I finally traced it this
weekend to an undersized .001 bypass cap
in the hv supply circuit.  Little pieces of the
1/4 in diameter cap were blown off the back.
(This cap looked too small to be original equip.)

Was that my problem all along?  Only time
will tell.

Tom - N1MM
________________________________________
[e-mail] (W8JI  Tom) wrote:

>In article <[e-mail]>,
>[e-mail] (R. L. Measures ) writes:

>>
>>Maybe some of the people who have installed lower Q suppressors should be
>>polled to see what their experiences are?

>If we poll people who wear copper bracelets, we'll find the majority will
>claim their health has improved. If they didn't believe, they wouldn't
>wear the bracelet. :-)

>73 Tom

Tom Wagner - N1MM



From [e-mail] Fri Nov 08 21:59:47 1996
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From: [e-mail] (Mike Foley)
Newsgroups: rec.radio.amateur.homebrew
Subject: HB Amp output circuit ???
Date: 4 Nov 1996 12:15:10 GMT
Organization: Your Organization
Lines: 4
Message-ID: <55kmoe$[e-mail]>
NNTP-Posting-Host: ppp0.hit.net
X-Newsreader: WinVN 0.91.6

I built an amp with a 3-500Z.  Bare-bones, no tuned input, pi out.  Works good
 on all
bands except 80m.  Loads into a dummy load, but not into my inv vee.  Ant is r
esonate
and presents an swr of less than 2:1.  Do I need to change coil/cap values??
Suggestions please.--Mike


From [e-mail] Fri Nov 08 21:59:48 1996
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From: Iwan Latev <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Is there anybody who played with a MC1 3175
Date: 4 Nov 1996 12:35:26 GMT
Organization: XS4ALL, networking for the masses
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NNTP-Posting-Host: asd13-27.dial.xs4all.nl
X-XS4ALL-Date: Mon, 04 Nov 1996 13:35:26 MET

is there somebody who has build a xmitter with this ic please let me know
how you did this and what your experiences are.

many thanks in advance

iwan.



From [e-mail] Fri Nov 08 21:59:48 1996
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From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
Subject: some questions about PIN diode switches
Date: 4 Nov 96 12:45:59 GMT
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Who are the most important manufacturers of PIN diodes ?

Can you give me examples for a TR switch in the 100 W range at 150 MHz ?

Can a slow rectifier be a low cost replacement for a PIN diode ?

Many thanks.
--
Claude
([e-mail])
The opinions expressed above represent those of the writer
and not necessarily those of her employer.


From [e-mail] Fri Nov 08 21:59:49 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Real Dogs
Date: 4 Nov 1996 13:10:20 GMT
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Can anyone help me identify a source for ultrasonic transducers? I have
neighbors with dogs that preclude my needs for an alarm clock, and trying
to get the neighbors attention has been fruitless. I'd like to get the
dogs attention with approx 20 KHz energy. I can generate the power, need
transducer to couple it to the rest of the world. The radio shack unit
(Rated on the outside of the box at 50 watts, on the inside at 25 watts,
burns up with 15 watts continuous.
T'would be lovely to have a bark detector send them back into their
respective homes.

W4ZCB


From [e-mail] Fri Nov 08 21:59:50 1996
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From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: Mon, 04 Nov 1996 13:14:39 GMT
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On 4 Nov 1996 03:43:37 -0500, [e-mail] (W8JI  Tom) wrote:

>In article <55gpdt$[e-mail]>, [e-mail] (Ron Angle)
>writes:
>
>>
>>I would appreciate input from anyone who has used separate relays for the
>
>>input and output on grounded grid linear amplfiers (as opposed to using a
>
>>single DPDT relay). Is there a problem if two separate relays do not
>close
>>simultaneously?
>
>Yes, the output relay MUST close first and release last, or you can ruin
>the bandswitch or other components (including the output relay).
>
>73 Tom

Hi Tom, what timeing would you recommend for the close / open and how
would the average ham go about achieving it?
73, Jesse, W6KKT


From [e-mail] Fri Nov 08 21:59:51 1996
Path: news1.epix.net!info.cs.uofs.edu!news.ultranet.com!iag.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!battery.awod.com!usenet
From: T Fultz <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need hard to find parts!
Date: Mon, 04 Nov 1996 09:29:25 -0500
Organization: IMS
Lines: 17
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: chs0082.awod.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (Win95; I)

I'd like to learn to build some of my own gear.  I've found some pretty
nice projects in a copy of 'Solid State Design' but I don't know where
to find some of the components.  Since this copy is a 1978 copy, I'm
sure some of the parts listed are going to be next to impossible to
find.
  Some of these components are:
    Amidon T-50-6 cores
    Millen 22050 4-54pF variable caps
    Various Miller inductors
    and Especially coil stock of all 'shapes and sizes'
                         (who has this stuff anymore)

Basically, I'd like to experiment and I can't find anybody with parts
anymore.  I've been to a number of ham fests and they're just not around
anymore.
     Please help...
      KE4RVB  (Tim   [e-mail])


From [e-mail] Fri Nov 08 21:59:52 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in2.uu.net!news.vcnet.com!port26.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Mon, 04 Nov 1996 07:42:18 -0700
Organization: Internet Access of Ventura County
Lines: 39
Message-ID: <[e-mail]>
References: <[e-mail]> <55ka2a$[e-mail]>
NNTP-Posting-Host: port26.vcnet.com

In article <55ka2a$[e-mail]>, [e-mail] (W8JI  Tom) wrot
e:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
>
> >
> > I do not deserve credit for the vhf-uhf-parasitic/gold-sputtering
> >theory.  It originated at Eimac.   I am only the messenger.
>
> Eimac claims you are mistaken, and have distorted a letter written by
> someone assigned to answer customer service letters.

Who at Eimac currently claims that I was mistaken and that I have engaged
in distorting a letter?  Is this person perhaps one of the 6 participants
in the 5500-word critique of yours truly in the Sept., 1994 *QST*---the
critique for which I was not allowed the courtesy of a rebuttal?

 The person at Eimac who wrote the letter I allegedly distorted was Willis
B. Foote,  Eimac's Chief Specifications Engineer in the Power Grid
Division.   The letter in question can be read at:
http://www.vcnet.com/measures/EimacF.html
Photocopies of the letter are available via snailmail.  E-mail me if you
want one.

BTW, Tom, I am still waiting for an answer to the question I asked on 3 Nov.:
> >Tom:  What is the rated grid-dissipation for the 3CX800A7?

I noticed that you said you were having problems with your news server.  I
participate in another newsgroup, and this appears to be SOP for AOL, as
well as Compuswerve.  Perhaps it's time to start looking for a local, ISP?

-------------------------------------------------------------------
---When this debate started , Tom, you insisted that no personal attacks
be used.---
-------------------------------------------------------------------
e-mail copy to Mr. Tom Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 21:59:53 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.cdsnet.net!news.magicnet.net!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!nic.mtl.hookup.net!noc.van.hookup.net!news.bctel.net!news.axionet.com!news
From: [e-mail] (Geoff L. Kennedy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Quadrifilar antenna article help
Date: Mon, 04 Nov 1996 15:34:24 GMT
Organization: "Kennedy's Space Centre" (pun definitely intended !!)
Lines: 17
Message-ID: <55l297$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mb145.axionet.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:

>Hi everyone.  I saw a construction article for a quadrifilar antenna
>in some magazine in the recent past.  I think it was QST.

   Yup.  QST, August 1996.  Doesn't look like it would be too hard to
build.



***************************************************************************
*    Geoff L. Kennedy                **     Located on the WEsT Coast of  *
*    "Kennedy's Space Centre"  8-)   **     Beautiful British Columbia !  *
*    E-mail: [e-mail]    **     Coquitlam, BC, Canada         *
***************************************************************************




From [e-mail] Fri Nov 08 21:59:54 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!hammer.uoregon.edu!csulb.edu!drivel.ics.uci.edu!news.service.uci.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Filters
Date: 4 Nov 96 16:25:52 GMT
Organization: ucsd usenet gateway
Lines: 23
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hi Gang,
    Wonder if you could clarify a point or two about filters.  I'm
modelling a filter for a DDS which should let frequencies up to 16Mhz
through and stop those above 24Mhz.
Using FDS.EXE, I've synthesized innumerable filters, which I've then
modelled in PSpice.  The specs don't seem to coincide exactly with the
modelling.  Anyway, I'm going to need a 7-pole elliptical filter with
about 60dB of attenuation.  The passband voltage with my present model
changes from about 1.1 to 1.7 volts.  In the stopband it goes down to
about 1.2mV or lower, according to PSpice.  Figuring power delivered to a
50 ohm load, that's 50-some dB of attenuation, I assume.

    My first question is whether this theoretical performance sounds
reasonable?
The second is what zeroes are in filter modelling and, particularly, what
order the elements corresponding to the zeroes should be placed in a
filter.  FDS lists the zeroes in the order 1,3,2.  I assume they are the
series-parallel capacitor/inductor elements across the top of the filter
and that they are numbered 1,3,2 from left to right.
Am I right?

    Thanks!
                        Dave KE9ED


From [e-mail] Fri Nov 08 21:59:55 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!usc!news.service.uci.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (David Covert)
Newsgroups: rec.radio.amateur.homebrew
Subject: Block diagram for data radio
Date: 4 Nov 96 17:17:46 GMT
Organization: ucsd usenet gateway
Lines: 13
Message-ID: <c=US%a=_%p=msft%l=[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


Can someone educate me a bit by showing me the block diagram for a
9600bd  FM data xmitter (2m) and rcvr (70cm). They should be able to
take and provide FSK right to/from a TNC.

Am I making any sense? <g>


Dave Covert, KB5GOG

'Very funny Scottie... now beam down my clothes...'




From [e-mail] Fri Nov 08 21:59:56 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!panix!feed1.news.erols.com!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!news.cais.net!in1.nntp.cais.net!news.good.net!news.good.net!news.izzy.net!news
From: Tim Hynde <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.space
Subject: Re: ELECTRONICS TIMES publisher is sick?
Date: Mon, 04 Nov 1996 13:31:25 -0500
Organization: Isthmus Corporation
Lines: 12
Message-ID: <[e-mail]>
References: <55hmv4$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mlc.izzy.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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To: James Lee <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.misc:117552 rec.radio.amateur.policy:42708 rec.radio.amateur.antenna:31071 rec.radio.amateur.digital.misc:19940 rec.radio.amateur.dx:1206 rec.radio.amateur.equipment:41757 rec.radio.amateur.homebrew:20769 rec.radio.amateur.space:8723

>James Lee wrote:

> Mike Mercado or KM6NP, who publishes the Electronics Times, even
> installed transmitter just for the purpose of jamming KJ6TQ
> operations and periodically broadcast warning to KJ6TQ repeater's
> users.
>
> Ham radio operators pride themselves in being polite.  Yeah right!

Well, there are still plenty of gentlemen operators left.

... and all that wide open space on 6m and 220 MHz ??...


From [e-mail] Fri Nov 08 21:59:56 1996
Path: news1.epix.net!info.cs.uofs.edu!news.ultranet.com!news.sprintlink.net!news-pen-4.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!news.sgi.com!csulb.edu!drivel.ics.uci.edu!news.service.uci.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Fabrizio MODINA)
Newsgroups: rec.radio.amateur.homebrew
Subject: SWR meter
Date: 4 Nov 96 19:18:12 GMT
Organization: ucsd usenet gateway
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I am looking for best schematics of SWR meter for HF bands (1,8 to 30 Mhz)
Thanks

IK1VCF  Fabrizio



From [e-mail] Fri Nov 08 21:59:57 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in2.uu.net!news.abs.net!news.scn.org!scn.org!bb840
From: [e-mail] (James Aeschliman)
Subject: Re: Feedback wanted.....
Message-ID: <[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail] (James Aeschliman)
Organization: Seattle Community Network
References: <55jjus$[e-mail]>
Date: Mon, 4 Nov 1996 19:36:02 GMT
Lines: 17


In a previous article, [e-mail] (Richard K. Adkins) says:

>
>Anyone out there have any feedback on the Ramsey kits? I just put
>together one of their QRP 80 meter receivers; it works OK (for what it
>is), but when I get that General class license in a few months I'll be
>wanting some better equipment. Any suggestions on which way to go (kit
>vs. ready-made, etc)? And where can I find info on kits? Ramsey is the
>only company I've found so far......
>Thanks....
>
Ten-Tec came out with a kit line about 1 year ago.  Write them for their
T-KIT catalog.  There address is in the latest QST.
--
Jim Aeschliman                      [e-mail]
Black Diamond, Washington           KD7MK


From [e-mail] Fri Nov 08 21:59:58 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: 4 Nov 1996 14:47:47 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 15
Sender: [e-mail]
Message-ID: <55lh93$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.news-fddi.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail] (W6KKT
Jesse) writes:

>
>Hi Tom, what timeing would you recommend for the close / open and how
>would the average ham go about achieving it?
>73, Jesse, W6KKT

As long as the antenna closes first, and opens last, you will be ok.

The amount of delay is unimportant, I'd make it enough to always guarantee
a correct sequence,  perhaps a minimum stagger of 10-20% of the slowest
relay's response time.

73 Tom


From [e-mail] Fri Nov 08 21:59:59 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news
From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.homebrew
Subject: I need some 2.5 mH pie-wound RF chokes
Date: 4 Nov 1996 20:19:11 GMT
Lines: 21
Message-ID: <55lj3v$[e-mail]>
NNTP-Posting-Host: cna0952843.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Hello, fellow home-brewers...

I need four (or more) pie-wound RF chokes for an 807 transmitter I'm
getting ready to build.  They need to be 2.5 mH, with at least 100 mA
continuous current rating.

Got any of these you can sell me?

73 de KC5NG
--
Dean W. Hemphill                      Email: [e-mail]
PO Box 328                            Home:  [phone]
Lake Dallas, Texas 75065-0328         Work:  [phone]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amateur radio operator KC5NG, Extra Class, VE (ARRL/W5YI), QRPer, CW op
Ford Mustang enthusiast ('66 coupe, '69 GT-350, '72 conv, '95 GT conv)
Die-cast model car collector (Ford products only, in all scales)
Plastic model car builder (Ford products only, 1:24 and 1:25 scale)
Glass insulator collector (specializing in "oddball" pieces)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



From [e-mail] Fri Nov 08 22:00:00 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!surfnet.nl!news.tue.nl!jeroens
From: [e-mail] (Jeroen Steenblik)
Newsgroups: rec.radio.amateur.homebrew
Subject: Question for Dutch radio amateurs
Date: 4 Nov 1996 20:32:03 GMT
Organization: Eindhoven University of Technology, The Netherlands
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: sascha.esrac.ele.tue.nl
X-Newsreader: slrn (0.8.7.1 UNIX)

(This message is in both English and Dutch)

In short: I'm looking for the PLL PCB of a Bosch KF-161 transceiver. If
you've got one, or know were I can get one, please contact me by email.

Thanks!

In het kort: ik ben op zoek naar de PLL print van een Bosch KF-161
zender/ontvanger (mobilofoon). Mocht je er een hebben of weten waar ik
er een kan krijgen, stuur dan een email naar onderstaand adres.

Bedankt!

73's, PE1RIL.

--
  Jeroen Steenblik - Computer Science Student - [e-mail]

Q: What's the difference between Microsoft Windows and a virus?
A: Apart from the fact that viruses are supported by their authors,
   use optimized, small code and usually perform well, none.



From [e-mail] Fri Nov 08 22:00:01 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!news
From: [e-mail] (Bob Dengler)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.space
Subject: Re: ELECTRONICS TIMES publisher is sick?
Date: 4 Nov 1996 21:21:08 GMT
Organization: JPL
Lines: 29
Message-ID: <55lmo4$[e-mail]>
References: <55hmv4$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 128.149.10.55
X-Newsreader: IBM NewsReader/2 v1.02
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In <[e-mail]>, Tim Hynde <[e-mail]> writes:
>>James Lee wrote:
>
>> Mike Mercado or KM6NP, who publishes the Electronics Times, even
>> installed transmitter just for the purpose of jamming KJ6TQ
>> operations and periodically broadcast warning to KJ6TQ repeater's
>> users.
>>
>> Ham radio operators pride themselves in being polite.  Yeah right!
>
>Well, there are still plenty of gentlemen operators left.
>
>.... and all that wide open space on 6m and 220 MHz ??...

Excuse me, 'wide open space' on 222 MHz?  Then why did the last 220 SMA meetin
g
feature a hearing due to a denial of freq. coordination to a repeater on Blue
Ridge, and why were there 2 freq. coordinators on 222 MHz in So. Cal. for a
while?  The 222 MHz band may not be used as much as 2 meters, but it's stuffed

full of repeaters.  There is some room on 6m, but it's awfully noisy.

I'm not sure we can blame Mike for the mess on 446.65.  He is only a pawn of
SCRRBA, which apparently decided that the frequency shall not have an 'open'
repeater on it.  The 'warning' transmitter cites references to SCRRBA
coordination, but makes no mention of possible coordination of KJ6TQ by other
freq. coordination entities, so it is not accurate to say that any other
repeater on the freq. is uncoordinated.

Bob NO6B (KE6TZF)



From [e-mail] Fri Nov 08 22:00:02 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!cs.utexas.edu!wotan.compaq.com!twisto.eng.hou.compaq.com!news
From: Monty Wilson <[e-mail]>
Subject: Converting a rig to positive CW keying
Message-ID: <[e-mail]>
Sender: [e-mail] (System Administrator)
Mime-Version: 1.0
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Content-Type: text/plain; charset=us-ascii
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Date: Mon, 4 Nov 1996 21:47:23 GMT
X-Nntp-Posting-Host: monty.pc.hou.compaq.com
Content-Transfer-Encoding: 7bit
Lines: 26

I bought a CMOS memory keyer that has only a "direct"
output; ie., can only key a positive voltage to ground.
I was unable to use it to key my TS830S, a negative-
voltage keyed transceiver.  I built a two-transistor
interface circuit similar to the grid-block output of
the MFJ Econo Keyer, and this weekend installed it into
the rig.  It uses only parts available from Radio Shack
and performs very well.  If you can find a point in your
rig where you can steal +12v or +9v it's a very easy
mod.  In the '830S it sits neatly on the pins of the key
jack, and the +9V is right next door on the anti-vox
control.

If anyone is interested, I can send a BMP file with the
circuit and all the information.

My Drake TR-4C is out on loan.  When it comes back home,
it definitely gets one of these little boards.  Now if
I could just find that QST mod that gets rid of the
AM/SSB grid block problem....

--
.........Monty.
mwilson @ flex.net (with spaces deleted)




From [e-mail] Fri Nov 08 22:00:03 1996
Path: news1.epix.net!info.cs.uofs.edu!news.ultranet.com!iag.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!bellman.NSD.3Com.COM!news.nad.3com.com!news
From: [e-mail] (Rex Allers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10GHZ 10 watt amp help needed!!
Date: 4 Nov 1996 23:32:32 GMT
Organization: 3Com
Lines: 20
Message-ID: <55lueg$[e-mail]>
References: <01bbc276$cdd46980$[e-mail]>
NNTP-Posting-Host: rexa-mac.dev.3com.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <01bbc276$cdd46980$[e-mail]>, [e-mail]

says...
>
>Hi all,
>
>        I have a TWT 10Ghz Amp made by Hughs that I need to
>        find a schematic for. I can't seem to find any info for
>        Hughs on the web, so does anyone have any suggestions?
>
>                                        Thanks, Rod (KD0XX)


What's the model? I may have some info.  Also, let me know what you are after
specifically (are you fixing a problem?, etc.).  I got an amp at a flea market

in the last year and was able to find a manual that I copied.  The whole thing

would be more than I want to copy again, but if it matches your unit I could
copy the most important stuff for you.

- Rex, KK6MK



From [e-mail] Fri Nov 08 22:00:04 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Good source for amplifier tips
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <55jsmu$[e-mail]>
Date: Mon, 4 Nov 1996 23:39:50 GMT
Lines: 38

In article <55jsmu$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>In article <[e-mail]>,
>[e-mail] (R. L. Measures ) writes:
>>Maybe some of the people who have installed lower Q suppressors should be
>>polled to see what their experiences are?
>
>If we poll people who wear copper bracelets, we'll find the majority will
>claim their health has improved. If they didn't believe, they wouldn't
>wear the bracelet. :-)

That attitude presupposes the conclusion. A survey could be useful if
it documents problems experienced before and after the suppressors
were added. If failures are significantly less after installation
of the suppressors, we have to conclude they are working, whatever
the mechanism. If failures are still happening at a statistically
similar rate after the suppressors are installed, then and only
then can we assume that the suppressors are faith healing quackery.

We can't determine if there is a statistically significant universe
for this problem unless a survey is done. I expect we'd need a
cumulative number of operating hours approaching 100,000 from a
survey before we'd begin to have any confidence in the correlation.
Science often has to depend on correlations when mechanisms are
poorly understood, or confounded by many other variables.

Correlation cannot prove causation, but no correlation at all
can flatly disprove a causitive linkage (and that's how the copper
bracelet theory was disproven). Thus this sort of survey is useful
for disproving a theory. If the correlation is strong, however, then
there is good reason to proceed down that path and try to determine
the exact causitive mechanisms involved (which may prove to be subtle).

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Nov 08 22:00:05 1996
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From: Mandy Wright <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tubes date needed
Date: Tue, 5 Nov 1996 00:11:29 +0000
Organization: Radio Services
Lines: 28
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
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In article <[e-mail]>,
"Koellner, Guenter" <[e-mail]> writes
>
>Hello,
>
>please help me to find the datas of the following tubes:
>
>    6KG6 / EL509
>and PL509
>
>These tubes are cheap and used for a small short wave amplifier.
>
>Please respond to the mailing list as well as to my private address.
>
>vy 73, Guenter, DL4MEA=40DB0KCP.=23BAY.DEU.EU   (AX.25)
>                dl4mea=40amsat.org            (Internet)
>                http://www.scn.de/=7Ekoellner (W

PL509 tv line output     heater V=40  I=0.3
                         anode  V=160 I=1.2 peak  (40  w )
                         screen V=160 I=0.045     (9 w )
                         dis W  40
Tim Wright      |    RF Engineer
West Sussex     |
UK              |


Turnpike evaluation. For information, see http://www.turnpike.com/


From [e-mail] Fri Nov 08 22:00:06 1996
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From: Moreno Poli <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: searching down converter UHF > 28
Date: Tue, 05 Nov 1996 01:14:11 +0100
Organization: Guttadauro Sistemi s.r.l
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i'm searching a down converter or transverer kit o schema
from UHF-shf  to 28 mhz

73 de IW1DRD Moreno


From [e-mail] Fri Nov 08 22:00:07 1996
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From: Chris Dunn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Terminals for Packet
Date: Mon, 04 Nov 1996 16:17:08 -0800
Organization: CCnet Communications (510-988-7140 guest)
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Hello...

        I have designed a small terminal that talks  to your TNC through a
RS-232 port.  It uses a LCD display, standard keyboard and uses a
microcontroller.  The unit is very small in size.  With the keyboard and
LCD display detached, it can be mounted inside your car, so you send
messages or talk to others when you away.

        If anyone is interested, please E-Mail me at [e-mail]

                                                -Chris Dunn
                                                  KE6MTO



From [e-mail] Fri Nov 08 22:00:08 1996
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From: John Siegel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: Tue, 05 Nov 1996 00:23:52 +0000
Organization: AT&T WorldNet Services
Lines: 32
Message-ID: <[e-mail]>
References: <[e-mail]> <55lh93$[e-mail]> <[e-mail]>
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Woody White wrote:
>
> I have used some 555 timers and a bit of TTL logic to sequence the
> relays.  Like Tom said, depends on the relay speed. I used about 100
> msec.  Long, but safe... Is just fine for PTT SSB and FM, break-in cw is
> another matter.  Woody
>
> ...snip...
> >
> > As long as the antenna closes first, and opens last, you will be ok.
> >
> > The amount of delay is unimportant, I'd make it enough to always guarantee
> > a correct sequence,  perhaps a minimum stagger of 10-20% of the slowest
> > relay's response time.
> >
> > 73 Tom
>
> --
> de  Woody (WB4QXE) -  [e-mail]
> Electron Microscopist/Microanalysist,
> Ham radio "homebrewer", shade tree mechanic,
> '90 Nissan 240SX, wish still had my Mcycle too!
> http://www.geocities.com/capecanaveral/3722
> .Since the idea is to not hot switch the relays there is another solution as
 well. I
use a pair of DowKey relays on my 2M amplifier (~300 watts)with no controlled
sequencing within the pair (i.e. their colis are in parallel). However, the pa
ir is
sequenced relative to the receive preamp and driver PTT so that RF drive is no
t
applied until both relays have had time to close.As long as the time is longer
 than
the slower relay it doesn't really matter whether the input or output relay cl
oses
first. BTW I am using the ARR commercial sequencer board, modified with an int
erlock
that prevents transmitting unless the preamp is out of the line.
73 John K4BNC


From [e-mail] Fri Nov 08 22:00:09 1996
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From: [e-mail] (Steven Kerns)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
Subject: Re: some questions about PIN diode switches
Date: 5 Nov 1996 00:50:46 GMT
Organization: Penn Biomedical Support, Inc.
Lines: 39
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Xref: news1.epix.net rec.radio.amateur.misc:117559 rec.radio.amateur.homebrew:20776 sci.electronics.design:24690 sci.electronics.components:13938

There are many, Hewlett Packard 5082-3201, 5082-3202
5082-3203, 5082-3204 are all rated for 120watts when
used as a series 50ohm switch.  They are useable from
T10Mhz to 8 Ghz and can be purchased from Penstock at
408-745-8100.  The ARRL UHF/Microwave Project Manual
has a lot of info on PIN diode switches.

PIN diodes are special in the fact that they are
a diode with a intrinsic layer at the junction (PIN =
P Material + Intrinsic Layer + N Material). They
are very close to being equal to a pure resistor at
RF frequencies (low L & C) and exhibit very low
resistances (<1 ohm) when forward biased but very
high resistance when reverse biased (> 10K ohm).

To learn more about PIN Diodes contact HP and
request (or you might have to buy) their GaAs &
Silicon Products Designer' Catalog.

Hope this helped!

73 Steven Kerns N3FTI
[e-mail]

In article <habi.847111559@bauv111>, [e-mail] says...
>
>Who are the most important manufacturers of PIN diodes ?
>
>Can you give me examples for a TR switch in the 100 W range at 150 MHz ?
>
>Can a slow rectifier be a low cost replacement for a PIN diode ?
>
>Many thanks.
>--
>Claude
>([e-mail])
>The opinions expressed above represent those of the writer
>and not necessarily those of her employer.



From [e-mail] Fri Nov 08 22:00:10 1996
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From: Raymond Ciaccio <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HTX-212 MODS?
Date: Mon, 04 Nov 1996 19:51:30 -0500
Organization: MHVNet, the Mid Hudson Valley's Internet connection
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NE1 know of any modifications to Radio Shack's HTX-212 mobile 2 meter
Rig? Any comment would be appreciated.

Thanx,
 Ray Ciaccio N2TAN


From [e-mail] Fri Nov 08 22:00:11 1996
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From: Christopher Trask <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Date: 4 Nov 1996 18:06:01 -0700
Organization: Primenet [phone]
Lines: 24
Message-ID: <55m3tp$[e-mail]>
References: <55h7bp$[e-mail]> <55kvgc$[e-mail]>
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Xref: news1.epix.net sci.electronics.design:24691 rec.radio.amateur.homebrew:20777

Michael Covington <[e-mail]> wrote:
: Maroof H. Choudhury ([e-mail]) wrote:
: : Most common PLL(like the NE564/565) application-notes/data-sheets say that

: : the PLL can be used for AM detection/demodulation. But I haven't seen any
AM
: : demodulator using a PLL. Can anyone show a few examples of such ckts?
: : Thanks
: : Maroof

: See QST Magazine, July 1993.

        Other good reference would be the EXAR and Philips databooks.


--
                                          Regards,

                                          Chris

------------------------------------------------------------------------------
Chris Trask / N7ZWY                       Circuit Design for the RF Impaired
ATG Design Services                       __  __     ____  ___       ___ ____
[e-mail]       _~_            /__)/__) / / / / /_  /\  / /_    /
                         (@ @)          /   / \  / / / / /__ /  \/ /___  /
----------------------ooO~(_)~Ooo---------------------------------------------


From [e-mail] Fri Nov 08 22:00:12 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Tue, 05 Nov 1996 01:24:05 GMT
Organization: INTERNET AMERICA
Lines: 26
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[e-mail] (Gary Coffman) wrote:

>Now that's true, if Ctune has a reactance of lets say 1 ohm at
>VHF
...
> the chassis connections are not really common at...VHF, it is a finite
>portion of a wavelength back to the tube cathode, so we should
>expect to see some reactance there. That changes the network
>topology significantly.

I think we have to assume, given what we know about real components,
that the tuning capacitor has long since gone series resonant and
probably appears, at VHF as a rather high value of inductive
reactance.  I don't believe we can assume that the anode circuit
provides much loading for VHF.  And if the VHF frequencies are, by and
large, unloaded, it doesn't take much gain to make the circuit
unstable.  We're dependent, I think, on keeping VHF out of the grid to
cathode circuit to keep circuit stability.


Fred

[e-mail]
[e-mail]
[e-mail]



From [e-mail] Fri Nov 08 22:00:13 1996
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From: [e-mail] (Alex Szopko)
Newsgroups: rec.radio.amateur.homebrew
Subject: Bi-polar Proms
Date: 5 Nov 96 02:20:46 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hi everybody!

I have a problem again.What is the difference between an E-PROM and a

BI-POLAR PROM ? Can you program a BI-POLAR PROM on an E-PROM programer,

as far as I know E-PROM is erasable and the BI-POLAR PROM is not.

Is that the only difference?

Please help

                        73's Alex VK7CS



From [e-mail] Fri Nov 08 22:00:13 1996
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From: [e-mail] (Bruce W. Forsberg)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: info on 1.2 gig pre amp 20 db or more
Date: Tue, 05 Nov 1996 03:46:05 GMT
Organization: CTS Network Services
Lines: 12
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"Bill Frovik" <[e-mail]> wrote:

>need info on a good pre amp for 1.2 gig atv.. other than that dam radio
>shack
>one..
>thanks
> n0mnb
>bill
PC Electronics sells the one from Downeast Electronics and it sells for $100.
I
use it and it seems to do a good job.

Bruce  WB6IZG


From [e-mail] Fri Nov 08 22:00:14 1996
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From: [e-mail] (Harry Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10GHZ 10 watt amp help needed!!
Date: Tue, 05 Nov 1996 04:37:03 GMT
Organization: Voicenet - Internet Access - [phone]
Lines: 8
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[e-mail] (Rex Allers) wrote:

You will find Hughes on the web, but it's unlikely that you will find
anything on their TWTS's. Tell us what the full model number is and
it's likely that someone will be able to help.

73, Harry, W3IIT



From [e-mail] Fri Nov 08 22:00:15 1996
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From: "Erik Skovgaard" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6-meter CW
Date: 5 Nov 1996 04:41:31 GMT
Organization: BCTEL Advanced Communications
Lines: 21
Message-ID: <01bbcad3$a538e4a0$14c56cce@default>
References: <55j6lc$[e-mail]>
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Craig,

The best deal is the Ten-Tec 20m/6m transverter.  I tried building a few of
the other kits, but this one has by far the best receive section.

73 and 66 de VE7MDL                ....Erik.


CraigIvey <[e-mail]> wrote in article
<55j6lc$[e-mail]>...
> Is there a kit around that I can build for 6-meter CW?  If so, where can
I
> get it and how much?
>
> Please reply via e-mail.
>
> Thanks,
>
> Craig
> KC5UMA
>


From [e-mail] Fri Nov 08 22:00:16 1996
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From: Michael Black <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need hard to find parts!
Date: Mon, 4 Nov 1996 23:48:49 -0500
Organization: Libertel de Montreal/Montreal Libertel
Lines: 46
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In-Reply-To: <[e-mail]>

On Mon, 4 Nov 1996, T Fultz wrote:

> I'd like to learn to build some of my own gear.  I've found some pretty
> nice projects in a copy of 'Solid State Design' but I don't know where
> to find some of the components.  Since this copy is a 1978 copy, I'm
> sure some of the parts listed are going to be next to impossible to
> find.
>   Some of these components are:
>     Amidon T-50-6 cores
>     Millen 22050 4-54pF variable caps
>     Various Miller inductors
>     and Especially coil stock of all 'shapes and sizes'
>                          (who has this stuff anymore)
>
> Basically, I'd like to experiment and I can't find anybody with parts
> anymore.  I've been to a number of ham fests and they're just not around
> anymore.
>      Please help...
>       KE4RVB  (Tim   [e-mail])
>

The Amidon core can be had from Amidon directly.  You should be able
to find their address in one of the ham magazines.

You can probably also get it from Dan's Small Parts.  I don't have the
address handy, but he is on the WWW now, and you can find the site
by one of the search engines.  He also has a selection of variable
capacitors.  Probably you could find something suitable.  Remember,
component substitution is the backbone of amateur radio.  If you
can't find the exact capacitor, you can usually get away with something
else, if you understand things.

I don't know where to get prewound coils.  The problem with a lot of
old articles is that they specify a manufacturer's part number, rather
than hard data like inductance etc.  This means you'll have to find
out what the parts numbers mean before you can substitute.  A tv
set will turn up plenty of small diameter coil forms, though the tuning
slugs are intended for a certain frequency range.  Winding coils is
easy, once you have the basic data.  The ARRL handbook should help
with the background.

Hope this helps for a start.

    Michael  VE2BVW




From [e-mail] Fri Nov 08 22:00:17 1996
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From: W3BV <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: GRT-12 Antenna Coupler
Date: Tue, 05 Nov 1996 01:36:51 -0500
Organization: Voicenet - Internet Access - [phone]
Lines: 8
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Does anyone know where I can get a schematic/manual on a surplus
automatic antenna coupler unit with the following markings:

"Chassis Electrical Group CH-498/GRT-12, Part #3610433, Republic
Electronics Ind., Inc.- Antenna Coupler Group OA-4514/GRT-12 [Part
3600039] AF30 (635) 24927" ?

Thanks in advance for the help.  Alan, W3BV [e-mail]


From [e-mail] Fri Nov 08 22:00:18 1996
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From: [e-mail] (Daniel S Nixon)
Newsgroups: rec.radio.amateur.homebrew
Subject: homebrew radar
Date: Tue, 05 Nov 96 07:43:11 GMT
Organization: University of Wollongong, NSW, Australia.
Lines: 6
Message-ID: <55mnmq$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ppp27.cc.uow.edu.au
X-Newsreader: News Xpress 2.0 Beta #2

I would like to build a weather radar for a thesis project using my computer
for signal processing and display, does anyone have any suggestions about
where to start, or what specific type of radar I should build!!

Thanks in advance.
Dan.


From [e-mail] Fri Nov 08 22:00:19 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: Mon, 04 Nov 1996 23:54:58 -0800
Organization: http://geocities.com/capecanaveral/3722
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]> <55lh93$[e-mail]>
NNTP-Posting-Host: 207.146.221.115
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.01E (Win16; I)

I have used some 555 timers and a bit of TTL logic to sequence the
relays.  Like Tom said, depends on the relay speed. I used about 100
msec.  Long, but safe... Is just fine for PTT SSB and FM, break-in cw is
another matter.  Woody


...snip...
>
> As long as the antenna closes first, and opens last, you will be ok.
>
> The amount of delay is unimportant, I'd make it enough to always guarantee
> a correct sequence,  perhaps a minimum stagger of 10-20% of the slowest
> relay's response time.
>
> 73 Tom

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Fri Nov 08 22:00:20 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: mods 4 ext RX/TX IC2GXAT????
Date: Mon, 04 Nov 1996 23:57:16 -0800
Organization: http://geocities.com/capecanaveral/3722
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Chris,
Don't know if there, but try mods link from:
http://www.geocities.com/capecanaveral/3722
Woody


Chris Findley wrote:
>  Anyone know where to find the info/docs for an extended RX and TX mod
> for the Icom 2GXAT handheld tranceiver???? I've already completed the
> "keyboard fix" for extended RX capability but I have need of the extended
> TX ability out of band. As far as I know there is no 'keyboard fix' for
> the TX mod.
>
> Thanks a mill.
> VE1UNI
> [e-mail]
> --

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Fri Nov 08 22:00:21 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Robert Watson)
Subject: CB to 10 Meter Conversions
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Date: Tue, 5 Nov 1996 09:35:47 GMT
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I recently picked up an older solid-state 23 channel SSB citizens-band
radio, and wish to locate some information on converting it to 10 meter
activity. Is there possibly any of this information on the Net, or do I
look elsewhere?

Thanks es 3

Bob/KJ7BO
[e-mail]

P.S. The model is 985-6060, it is called a Pinto-23B, and was manufactured
for JC Penneys in the late 1960's or early 1970's.



From [e-mail] Fri Nov 08 22:00:22 1996
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From: [e-mail] (R.L. Measures)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Tue, 05 Nov 1996 04:23:00 -0700
Organization: WestNet
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... ... ...
> Subj:   3CX800A7
> Date:   96-10-31 13:21:43 EST
> From:   [e-mail]
> To:     [e-mail]
>
> Hi, Tom. I hear you are in conversation with Rich Measures.
> To answer your question regarding the 3CX800A7, this tube uses a grid made
> from material which has a high melting point (Molybdenum or Tungsten)
> plated with gold.  If one over drives this tube or operates it at high
> grid current due to improper loading or failure in the matching network or
> load, then it is likely that the temperature of the grid will quickly,
> within seconds, become high enough to vaporize the gold.  This may be what
> happened to the 8874 tubes that Measures returned to Eimac a long time
> back

That's not what the tube engineer who disassembled and inspected the two,
8875, s/n G8AD-241 and s/n F8VD-4283, tubes told Mr. Foote, according to
Mr. Foote.

> and Bill Foote, then responsible for writing letters related to
> returned products, wrote something about a microwave oscillation that we
> saw IN ANOTHER PRODUCT, maybe he did not make that distinction, but to
> this day Measures believes that the incidence of failures with gold
> evaporated from grids are entirely due to parasitic oscillations, and
> tries to hold this letter from Mr. Foote as evidence.  This is bunk. I
> trust that is what you are discussing with Measures?  May I suggest that
> you make your life more enjoyable, do something else than arguing with
> Measures.
>
Hmmmmmm.  An UNSIGNED letter, offered as evidence.  Very curious, me
thinks.  Who wrote the unsigned letter, Tom?

My conversation with Willis B. Foote in Feb. 1986  had nothing to do with
microwave oscillation in a high power UHF-TV amplifier klystron.  Foote did
not work in the klystron div.  He was the chief specifications engineer in
power grid.  The 8877 is a power grid amplifier tube.  The 8877 is not a
klystron tube.

I have not stated that parasitic oscillation is the only means of removing
gold from the grid.  However, when gold sputtering takes place at the same
time that tune capacitor arcing takes place, in an amplifier that was tuned
up correctly, an atypical event probably took place.

Tom---Have you answered the question I asked you about the inductance of
the Matsushita film resistors we use in our parasitic suppressor retrofit
kits?  Have you answered my question about the rated grid-dissipation for
the 3CX800A7?
-------------------------
e-mail copy to Mr. Tom Rauch

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:00:23 1996
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From: "Richard Gunn;G7UDG" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Noise-Cancelling mic.
Date: Tue, 5 Nov 1996 12:40:27 +0000
Organization: University of Hertfordshire
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Can anyone pls help??  I am looking for a **small** noise-cancelling mic.
to be used inside a (motorbike) crash-helmet.  Where may I obtain one of
these from and for how much (UK!!!)

Also, some form of PTT that is cheap - not the one I would like to get
(the one the Police use on their bikes!) - but a cheap alternative!!!

Many thanks,

==============================================================================
=
 _    G7UDG     Internet: [e-mail]          <-- University
|_)
| \ichard       Internet: [e-mail]    <-- Home
------------------------------------------------------------------------------
-
  Please reply to university as main address (mail read daily where possible)
         Home addresses get read on most weekends, and during holidays
==============================================================================
=







From [e-mail] Fri Nov 08 22:00:24 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 5 Nov 1996 07:55:21 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Hi Rich,

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>Who at Eimac currently claims that I was mistaken and that I have engaged
>in distorting a letter?

Actually it isn't just one person, it's the entire staff. A better
question might be can you give the name of one person in Varian
engineering supporting your claims?

>Is this person perhaps one of the 6 participants
>in the 5500-word critique of yours truly in the Sept., 1994 *QST*---the
>critique for which I was not allowed the courtesy of a rebuttal?

Since your very first article, Varian (Eimac) and perhaps a dozen other
individual people have asked and communicated to QST that the claims made
were incorrect.
If QST is guilty of anything, they are guilty of not sending your material
out for technical review, or allowing others to challenge your claims. You
had page after page of featured article space to spread technical nonsense
around, until now whenever a simple problem comes up it's blamed on a
parasitic.

You lay blame on "6 participants", yet those six were selected from a
large stack of letters. Even at that, your articles were sent out to a
large number of brand new non-participants and they supported the letters
of disagreement.

Please don't think for one minute six people "just don't like you". You're
a talanted writer, and a likeable guy with good word command. It's just
that many of the theories you developed are not accurate. It's technical
disagreement, nothing more...nothing less. Anyone makes these kinds of
mistakes when they work alone, that's always a problem without outside
collaboration or review.

I think magazines should check articles out and help authors and readers
before things get published, not after the fact. But what's done is done.
I'd rather have seen a moderated discussion of the issue, but it wasn't in
the cards. Finger pointing does nothing constructive, QST made a mistake
(by not checking out stuff before publication), and that's that.

> The person at Eimac who wrote the letter I allegedly distorted was
Willis
>B. Foote,  Eimac's Chief Specifications Engineer in the Power Grid
>Division.   The letter in question can be read at:
>http://www.vcnet.com/measures/EimacF.html

Rich, I miss something when I read the letter. Here's what I understand:

1.) It says YOUR letter about your theory on parasitics was interesting.

2.) It said the tubes were badly overheated inside. "Apparently the result
of an oscillation".

3.) It says if the grid is overheated, gold vaporizes off and ruins the
tube.

The only time it mentions parasitics is when it thanks YOU for the
interesting letter about parasitics.

I don't understand how it says "Parasitics damage grids of tubes, but
fundamental RF excitation does not." Can tell me what I missed?

>BTW, Tom, I am still waiting for an answer to the question I asked on 3
Nov.:
>> >Tom:  What is the rated grid-dissipation for the 3CX800A7?

4 watts.

73 Tom


From [e-mail] Fri Nov 08 22:00:25 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Tue, 05 Nov 1996 06:31:29 -0700
Organization: Internet Access of Ventura County
Lines: 51
Message-ID: <[e-mail]>
References: <[e-mail]> <55dbja$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port27.vcnet.com

In article <[e-mail]>, [e-mail]
(Gary Coffman) wrote:

> In article <[e-mail]>
[e-mail] (R. L. Measures ) writes:
snip...
> >
> >Initially, I was also puzzled by the seeming ease with which a VHF
> >oscillation can arc over a tune capacitor with a much higher HF peak
> >voltage rating than is required for the amplifier. However, capacitor
> >plates are arcing/melting too often to ignore.
snip..
snip....
> But now lets go back and think about the fact that the chassis
> connections are not really common at RF. For VHF, it is a finite
> portion of a wavelength back to the tube cathode, so we should
> expect to see some reactance there. That changes the network
> topology significantly.
>
> Gary
------
Interesting analysis, Gary.  There are so many variables at VHF, it's mind
boggling.
 I remain convinced that the energy involved is probably well above HF.
The simultaneous occurance of an extreme grid current pulse indicates that
the amplifier tube is virtually unloaded during the event.  Therefore, the
amplifier tube is most likely producing substantive amounts of energy that
can not pass through the (low pass) HF tank circuit.  Another factor is
the colour of the arc.  I have seen HF arcs before.  This is different.
However, analysis is compounded by the intermittency factor.

 Part of the answer may be that we are assuming that the tune C has no
series-L and only an 1 ohm or so of reactance at VHF.  However, in a 922,
the tune capacitor has roughly 20 ohms of reactance at the frequency of
the apparent VHF oscillation. In a SB-220, the tune C has roughly 25 ohms
of reactance at the frequency of the apparent VHF oscillation.  RE:
series-L in the tune-C:  Many people assume that wide, flat conductors
have zero inductance.  However, this is not true.  Even superconductors
have inductance.

 In a previous post, I broached the subject of the possiblity of
developing high potentials from a 120v 60Hz source, using only one
capacitor in series with one inductor.

  Does anybody remember the WW2 radar transmission-lines that used copper
'insulators'?
--------------------------------------
e-mail copy to Mr. Coffman

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:00:26 1996
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From: [e-mail] (Jim Potter)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.component
Subject: Looking for 600 MHz 100-200 watt amplifier (pulsed)
Date: Tue, 05 Nov 1996 14:14:33 GMT
Organization: The Santa Fe Institute
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Xref: news1.epix.net sci.electronics.components:13991 rec.radio.amateur.homebrew:20819 sci.electronics.design:24798

I'm looking for a manufacturer of a 600 MHz amplifier with about 150 W
output. Operation will be drive pulsed at 0.5% duty factor up to 100
usec pulse width. I'd like to start with 50 mW in, but the low power
end up to a few hundred mW is not a problem.

Jim Potter


James M. Potter, President              TEL: [phone]
JP Accelerator Works, Inc.              FAX: [phone]
2245 47th Street                        EMAIL: [e-mail]
Los Alamos, NM 87544-1604               URL: http://www.jpaw.com



From [e-mail] Fri Nov 08 22:00:28 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Tue, 05 Nov 1996 07:33:37 -0700
Organization: Internet Access of Ventura County
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]> <55dbja$[e-mail]> <[e-mail]> <[e-mail]> <55m4vm$[e-mail]>
NNTP-Posting-Host: port20.vcnet.com

In article <55m4vm$[e-mail]>, [e-mail] (J. Fred
Riley) wrote:

> [e-mail] (Gary Coffman) wrote:
snip...

> I think we have to assume, given what we know about real components,
> that the tuning capacitor has long since gone series resonant and
> probably appears, at VHF as a rather high value of inductive
> reactance.  I don't believe we can assume that the anode circuit
> provides much loading for VHF.  And if the VHF frequencies are, by and
> large, unloaded, it doesn't take much gain to make the circuit
> unstable.  We're dependent, I think, on keeping VHF out of the grid to
> cathode circuit to keep circuit stability.
>
>
> Fred
-----
I agree, Fred. The VHF loading is probably light.
 VHF-loading in the anode circuit should be a function of the R in the
series of anode circuit conductors between the anode and the tune-C.  In
order to visualize this, it is helpful to measure the L of each conductor
and then to convert the series-L-R-circuit to an equivalent parallel
circuit between the anode and chassis-ground. .  This way it's  easier to
see that as series-R increases, parallel-R decreases.  Since the voltage
gain of a triode is basically mu multiplied by the parallel-R, the
bottom-line is that increasing series-R in the path of the VHF-resonant
anode circuit, lowers the VHF gain of the amplifier tube.  Does increasing
series-R  sound like it would decrease or increase the ability of the
amplifier tube to oscillate at VHF?
---------------------------------
e-mail copy to Mr. J. Fred Riley

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:00:29 1996
Newsgroups: rec.radio.amateur.homebrew
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From: Monty Wilson <[e-mail]>
Subject: Re: CB to 10 Meter Conversions
Message-ID: <[e-mail]>
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[e-mail] (Robert Watson) wrote:
>
>I recently picked up an older solid-state 23 channel SSB citizens-band
>radio, and wish to locate some information on converting it to 10 meter
>activity. Is there possibly any of this information on the Net, or do I
>look elsewhere?...
>P.S. The model is 985-6060, it is called a Pinto-23B, and was manufactured
>for JC Penneys in the late 1960's or early 1970's.
>

Sounds like an old crystal-plexed rig.  I've never converted that particular
model, but in general the crystal-plex conversions are simpler and have
better odds of success, but are more expensive because you must replace
four or six crystals versus the one or two for the PLL rigs.  One good
resource is the CB-series Sams Photofact, available at your library.
Look up the model in the Photofact index, also at the library, and you'll
find the Photofact CB-series issue number that contains all the drawings
and schematics for your radio.  There are old "73" and QST articles from
the 1977-1980 time frame that help with these conversions, but I don't
have the issue dates handy.  Anyone have these?

For a top-notch SSB rig, there are just a few things to be done.  The
first (at least I do it first) is the frequency conversion itself.
The other various conversion things to be done to a radio vary depending
on the particular type of rig, the original operating mode (AM or AM/SSB),
the desired 10m or 12m operating mode (AM, FM, SSB, CW, combinations),
and other desired features, but first we must see if the rig will go to
the new frequency.

Once the new crystals are in place, with a voltmeter, oscope (need not be
a calibrated scope; a Heath cheapie will do), a scanner (to verify
frequencies by listening to harmonics of the desired oscillator frequencies)
and a package of those plastic tuning tools, go through the transmitter
strip and the receiver strip, as described in the magazine articles, bring
the radio up or down in frequency.

Now for an SSB rig you want to do two things that I know of.  The
clarifier must be "opened" so it slides +/- 6 kHz instead of the stock
+/- 1 kHz, and it also must be made to vary the transmit frequency as
well as the receive frequency.  This may still leave "holes" in the
frequency coverage, depending on the crystal plan you've selected, but
it will bring you very close to 100% coverage of the desired band.

The "opening" of the clarifier is accomplished by changing values of
capacitance, and possibly adding a small amount of inductance, in the
clarifier circuit.  The change from RIT to RIT/XIT is accomplished by
disabling whatever method the rig used to prevent the clarifier from
swinging the oscillator when in transmit mode.  The most difficult are
the ones where the clarifier swings an oscillator that doesn't even run
in transmit mode, but I think those are the exception rather than the rule.

Good luck, and have fun on the upcoming cycle.
--
.........Monty.
mwilson @ flex.net (with spaces deleted)




From [e-mail] Fri Nov 08 22:00:31 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: Tue, 5 Nov 1996 15:45:55 +0000
Organization: IFW Technical Services
Lines: 28
Distribution: world
Message-ID: <h$$[e-mail]>
References: <[e-mail]>
 <55lh93$[e-mail]> <[e-mail]>
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Woody White wrote:
>I have used some 555 timers and a bit of TTL logic to sequence the
>relays.  Like Tom said, depends on the relay speed. I used about 100
>msec.  Long, but safe... Is just fine for PTT SSB and FM, break-in cw is
>another matter.

I use two multi-pole relays, one of normal 'fast' speed and another one
RC-slugged to give slow make, slow break. Various make/break contacts on
the two relays are interlinked to give the switching delays. 100ms
sounds about right - long enough so that the two relays go noticeably
"ker-lick".

The most important thing is that the coax relay contacts have plenty of
time to switch over AND FINISH BOUNCING before you hit them with high-
power RF. Allow extra time in case a relay might stick occasionally
before starting to move. On returning from TX to RX, allow time for the
RF power to disappear before moving the coax relays.

This system works by leaving enough time for the necessary things to
happen, so isn't as reliable as a system that's fully interlocked.
OTOH (FWIW, YMMV etc) after 10 years I'm still running a full kW at
432MHz through the same "500W" coax relay, and it has never blown a
GasFET in the preamp.

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - world-wide.


From [e-mail] Fri Nov 08 22:00:32 1996
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From: Walter Rawle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew radar
Date: Tue, 05 Nov 1996 08:57:29 -0800
Organization: Ericsson Data Services Americas
Lines: 24
Message-ID: <[e-mail]>
References: <55mnmq$[e-mail]>
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Daniel S Nixon wrote:
>
> I would like to build a weather radar for a thesis project using my computer
> for signal processing and display, does anyone have any suggestions about
> where to start, or what specific type of radar I should build!!
>
> Thanks in advance.
> Dan.Dan:
   The majority of wx radars work at 5 Ghz, so your first task will be to
assemble the necessary RF parts:
1. Antenna - prime focus parabolic reflector antenna with dual
polarization feed and an orthomode transduce
2. Tx - a simple magnetron with suffice for your activities. This will
provide you with a rough pulse transmitter - the spectrum wont be pretty
but it will work
3. Rx - you will probably get by with a single mixer diode front end with
a Gunn LO, the IF output frequency will depend in large measure on how
fast your DSP board runs

A word of advice: this is a big project. If there is a C band weather
radar at your local airport or met station, you may want to make a visit
and start asking lots of questions

walter rawle VE1AWS/W4


From [e-mail] Fri Nov 08 22:00:33 1996
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From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Tue, 05 Nov 1996 17:13:40 GMT
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On 3 Nov 1996 23:50:38 -0500, [e-mail] (W8JI  Tom) wrote:

>In article <[e-mail]>,
>[e-mail] (R. L. Measures ) writes:
>
>>
>>Maybe some of the people who have installed lower Q suppressors should be
>>polled to see what their experiences are?
>
>If we poll people who wear copper bracelets, we'll find the majority will
>claim their health has improved. If they didn't believe, they wouldn't
>wear the bracelet. :-)
>
>73 Tom
Hi Tom,  at the moment I'm not wearing copper bracelets (perhaps in
the future?).  After reading the articles in QST (by Richard Measures)
I installed the low Q suppressors as precautionary measure, in two
Henry, one Heathkit SB220, and a 4-1000 amp.  The change that I
noticed was the amplifiers seemed to tune "smoother", elimination of
the random rf "popping", and had about a 0.5db loss of power on 10
meters.  I have talked with many, many hams on the air who have also
installed the low Q suppressors  (i'm surprised I'm the only one on
this group who will admit using them), As of this date,  I have not
heard or talked with anyone who has used, or is using these suppresors
that has had a negative experience due to their installation, myself
included.  So, have they helped?  I don't know!  I havn't had any
related problems with the various amplifiers that use these
suppressors.  Will I take them out because of the recent negative
threads as to their use posted in this group and written in QST? No.
Will I throw away my wonderful book Reflections (by Walter Maxwell)
because QST and a FEW of its board members disagree  with some ot it's
content?  NO!  Will you pay for the repair of my linear should it
develope a BANG, BANG if I eliminate those low Q suppressors that
don't work (I'm drinking your "snake oil")?
Respectfully, Jesse, W6KKT




From [e-mail] Fri Nov 08 22:00:34 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 5 Nov 96 17:37:43 GMT
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My Sony ICF-SW 7600 radio (Italian version) covers the following frequency
range 150-285 KHz step 3 KHz, 531-1602 KHz step 9-10 KHz selectable,
3850-26100 KHz step 5 KHz, 88-108 MHz FM step 50 KHz.

The American version of the same radio covers the LF,MF and HF frequencies
with the range 150-29995 KHz. I would liKE to obtain the same HF frequency
range as that available on the American version but the frequencies
1602 - 3850 KHz and 26100 - 29995 KHz are not receivable on the Italian versio
n!

The radio is controlled by CPU, it has a PLL utility, is equipped with a
keyboard and can store 10 items in memory. The receiever is 48055 and 455 KHz
double version and demodulates AM and SSB.

At power on the CPU checks the jumper configuration (LW, step 9-10 KHz in MW,
SW, FM). Setting the LW jumper to OFF extends the frequency range from 285 to
531 KHz, while setting the FM jumper to OFF extends the FM range from
76 to 88 MHz step 100 KHz. Setting the SW jumper to ON or
OFF has no effect, the frequency range remains 3850-26100 KHz in both cases.

* Does anybody have the ICF-SW 7600 schematics?

* Does anybody know how to extend the frequency range from 1602 to 3850 KHz
   and 26100 to 29995 KHz?

Please send your reply to my e-mail address, as detailed below.

Thanks.

Chalp Maurizio  Olivetti (Italy)

e-mail address: [e-mail]




From [e-mail] Fri Nov 08 22:00:35 1996
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From: Brooke <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
Subject: Re: some questions about PIN diode switches
Date: Tue, 05 Nov 1996 09:56:16 -0800
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Claude Frantz wrote:

Claude:

There are two types of diodes: those that store charge (such as PIN,
varactor, SRD,
some schottkies that are made inproperly under large forward bias)
and those that do not (such as schottky, tunnel).  For use at 150 MHz
you need a diode that has a long lifetime (stores a lot of charge).
>
> Who are the most important manufacturers of PIN diodes ?
Try MA-COM and UNITRODE


From [e-mail] Fri Nov 08 22:00:36 1996
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From: [e-mail] (Maroof H. Choudhury)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics
Subject: NBFM modulator: design wanted
Date: Tue, 05 Nov 96 18:40:58 GMT
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Can anybody suggest a simple design of a narow band frequency
modulator for Citizen's band?


From [e-mail] Fri Nov 08 22:00:38 1996
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From: "Designers Forum " <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Small Signal Amplifier Design
Date: 5 Nov 1996 19:00:19 GMT
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At one time in my schedule, amplifier design for the hearing impaired was
very interesting, some of the concerns included topics generally talked
about now in the news group. I would like to jump in and suggest a high
gain amplifier.  Vowels you know au dominate the lower frequency spectrum
<1000 Hz . The consonants that we most need are the upper frequencies 3000
Hz or >. For those persons hearing impaired be aware of those so called
tunable telephones which give you gain, etc. Some do not. One is the XL-30
telephone. deficient by anywhere from 5 to 10 dB gain as advertised. These
devices have the electret type, and some very clever earphone designs with
very flat coil diaphragms. If anyone has a characterization type document I
would like to know and help make it more public. I am currently building a
site to include diagrams and such info. The amplifier design I am working
on uses a biased internal line Operational amplifier BA3516. Has anyone
seen this? its a quad split voltage I think. I will have the schematic on
my site soon. If anyone is interested to pursue this jump right in. As I
was looking at the questions here, the one about how much will a transistor
amplify. If you have some documentation on the semiconductor, set up a
small circuit and characterize the input load and the output load DC, and
AC signal. Use a resistor and spread the values yes even for relating to an
inductive load.



From [e-mail] Fri Nov 08 22:00:39 1996
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From: [e-mail] (Stephen B Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Soldering small connections
Date: 5 Nov 1996 20:21:28 GMT
Organization: The Ohio State University
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References: <54shd8$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: balan.eng.ohio-state.edu

>In article <[e-mail]> Clif
ford Buttschardt <[e-mail]> writes:
>>Tom, almost all of us are insane to put up with soldering these very small
>>connectors.  Unless you can find a tip that is small enough to fit an
>>existing soldering iron, the next best solution is simply to wrap copper
>>wire of small diameter around your existing iron.  The last turn is
>>extended forward far enough to solder but not block your view.

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>That's a crude field expedient technique at best.
>
>Here's an expedient tip that'll work better. Take a piece of 1 inch
>diameter CRS and chuck it in the lathe. Turn the end down to 50 mils...
>
>Now you can heat the iron over a gas stove and use it to solder your
>connections. Return it to the stove between joints and keep it well
>tinned.

What do you use to tin CRS?

--
Steve Brown, N8HFI              [e-mail]
        http://er4www.eng.ohio-state.edu/~browns
Chief Engineer, The Ohio State University Radio Observatory ("Big Ear")


From [e-mail] Fri Nov 08 22:00:40 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 5 Nov 1996 15:51:03 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <55k9ms$[e-mail]>, [e-mail]
(CommQuart) writes:

>
>Pardon my ignorance in this matter, but I am curious....
>So what if the gold boils/sputters/leaves-for-Florida??  I assume
>the remaining grid structure is still metallic, and should still
>function?
>
>Pete K1ZJH

It poisons the cathode, and also can lower voltage breakdown if it gets in
the wrong area.
73 Tom


From [e-mail] Fri Nov 08 22:00:41 1996
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From: [e-mail] (Bruce N  Gavin)
Newsgroups: rec.radio.amateur.homebrew
Subject: microwave device ID ?
Date: 5 Nov 1996 21:28:29 GMT
Organization: Growing Business
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: pmfr1ip11

Greetings:   Can someone ID, provide general specs or interest in the
following? -Waveline type 30693 wave guide dummyload. Also -Waveline,
type30687, unit part of wave guide, has "N" connector.  Thanks in
advance.  Bruce KD1MW  [e-mail]


From [e-mail] Fri Nov 08 22:00:42 1996
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From: Mitch Muerle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Simple PL Decoder
Date: Tue, 05 Nov 1996 15:45:14 -0700
Organization: PowerNet
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Hi and thank you for reading.

I'd like the plans to make a simple PL Decoder to open an HT repeater
reciever, nothing fancy, but stable.

Thanks and 73 de KB7PDF Mitch

email [e-mail]


From [e-mail] Fri Nov 08 22:00:43 1996
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From: "Bob Smith" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.electronics.equipment
Subject: BIRD 43 Help/Tutorial
Date: 5 Nov 1996 23:39:22 GMT
Organization: InternetMCI
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Can someone kindly point me to a tutorial on the Bird 43 watt meter.  Just
got one used without a manual.  They look very simple to use.

I do have a RF Sampler fitted - what range out output does this have? -
would hate to blow my frequency meter or o-scope.!

Thanks a million for reading.

--
>>>>
Bob Smith    N3FTU
Atlanta, GA


From [e-mail] Fri Nov 08 22:00:43 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: I need some 2.5 mH pie-wound RF chokes
Date: 5 Nov 1996 18:50:16 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <55lj3v$[e-mail]>, [e-mail] (Mustang
Maniac) writes:

>I need four (or more) pie-wound RF chokes for an 807 transmitter I'm
>getting ready to build.  They need to be 2.5 mH, with at least 100 mA
>continuous current rating.
>
>Got any of these you can sell me?
>
>73 de KC5NG

Try Mouser Electronics. If you are going to put one in the anode, voltage
rating is important. You will be much better off with a little less
inductance for the anode choke, and higher breakdown voltage.

73 Tom


From [e-mail] Fri Nov 08 22:00:44 1996
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From: Daniel S Nixon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: homebrew radar
Date: Wed, 06 Nov 1996 09:55:25 +1000
Organization: University of Wollongong, NSW, Australia.
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I would like to build a weather radar for a thesis project in a couple
of years time using a PC for signal processing and display.  Does anyone
have any suggestions on where to start or where to find information that
would be useful for such a project?

Thanks in advance,

Dan.


From [e-mail] Fri Nov 08 22:00:45 1996
From: [e-mail] (David Covert)
Subject: RE: searching down converter UHF > 28
Date: 5 Nov 96 16:13:34 -0800
References: <[e-mail]>
Message-ID: <[e-mail]>
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Down East Microwave has such kits I think...

Phone: [phone]
Fax: [phone]

73,
Dave KB5GOG


From [e-mail] Fri Nov 08 22:00:46 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 5 Nov 1996 19:14:56 -0500
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In article <55m4vm$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>
>I think we have to assume, given what we know about real components,
>that the tuning capacitor has long since gone series resonant and
>probably appears, at VHF as a rather high value of inductive
>reactance.

Not at all Fred.

There are two self-resonant points of the Oren Elliot 250 pF capacitor
used in the AL80B withing the range of my 1-1000 MHz Impedance analyzer.

With the cap open, the series resonant point is 489.1 Mhz where it looks
like .23 ohms j0 and another where at 570.74 MHz where it measures  14.1
ohms j 0.

These points move to 170.4 and 289.9 MHz when the cap is meshed. I can
find no anti resonant impedance in the range of 1 to 1000 MHz.

You'd be in radio hell trying to drive that cap with RF at VHF or UHF and
make it arc.

>I don't believe we can assume that the anode circuit
>provides much loading for VHF.

We don't need to assume anything. We can measure it. And it is very low
(<300 ohms scalar) over the range of 50 to 1 GHz in the 80B.

>And if the VHF frequencies are, by and
>large, unloaded, it doesn't take much gain to make the circuit
>unstable.  We're dependent, I think, on keeping VHF out of the grid to
>cathode circuit to keep circuit stability.

The plate impednce is low, except in crummy tubes like 811A's, 572B's,
450TH's, 833A's, and so on. They have long thin anode leads. They also
have long thin crummy grid connections. If you look at amplifiers designed
with those tubes, you will see large parasitic inductances are required
along with higher values of resistance. That's because the loading
resistance has to across an appreciable portion of the inductive path from
anode to RF bypass (the tuning cap). Since the lead inside the tube is so
long, the inductance outside the tube the resistor is across needs to be
larger.

Since the grid lead is so long, the frequency of oscillation is lower.
That forces us to apply damping at a lower frequency. Looks at the size of
the inductor in an 811 amp compared to a 3-500Z (not the Heathkit 220,
they screw up the grids with the series caps). There is typically a 5:1
ratio between them in suppressor inductance.

73 Tom


From [e-mail] Fri Nov 08 22:00:47 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: 5 Nov 1996 19:22:28 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <[e-mail]>, Woody White
<[e-mail]> writes:

>I have used some 555 timers and a bit of TTL logic to sequence the
>relays.  Like Tom said, depends on the relay speed. I used about 100
>msec.  Long, but safe... Is just fine for PTT SSB and FM, break-in cw is
>another matter.  Woody

 A diode across the coil will slow the release time. A cap across the coil
with a series r will slow the attack time.

I use a parallel cap acoss the coil and a series diode/resistor on the
input relay, along with a diode across the output relay in one case.

73 Tom


From [e-mail] Fri Nov 08 22:00:48 1996
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From: Gary Tait <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB to 10 Meter Conversions
Date: Tue, 5 Nov 1996 20:01:42 -0500
Organization: Bruce Municipal Telephone System
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]>
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To: Robert Watson <[e-mail]>
In-Reply-To: <[e-mail]>

On Tue, 5 Nov 1996, Robert Watson wrote:

#
#I recently picked up an older solid-state 23 channel SSB citizens-band
#radio, and wish to locate some information on converting it to 10 meter
#activity. Is there possibly any of this information on the Net, or do I
#look elsewhere?
#
#Thanks es 3
#
#Bob/KJ7BO
#[e-mail]
#
#P.S. The model is 985-6060, it is called a Pinto-23B, and was manufactured
#for JC Penneys in the late 1960's or early 1970's.

It might be a bit expensive,being that it is a crystal synthesized rig.

You might be able to build a VFO for it.

Gary Tait , VE3VBF
- Please do not quote US prices, they are no good to me ,here in Canada -



From [e-mail] Fri Nov 08 22:00:51 1996
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From: [e-mail] (Brian Carling)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP homebrew list
Date: Wed, 06 Nov 1996 01:07:24 GMT
Organization: Monumental Network Systems
Lines: 34
Distribution: inet
Message-ID: <55p2qd$[e-mail]>
References: <[e-mail]> <[e-mail]> <55jeu0$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82

TOTALLY brilliant idea! I wish I had thought of it back when
I still had my ICF-2010!

[e-mail] whistled a happy tune like:

|>Stephen Wandling <[e-mail]> wrote:

|>>I am interested in Homebrew.  Homebrew anything.  It's something that I
|>>can provide some helpful information on at times.  Kits are not
|>>homebrew. My own take on QRP is that it's small, cheap, portable and
|>>doable.  I've had this fantasy of camping on some mountain ridge, with
|>>my antenna strung in the alpine firs, snug in my sleeping bag, tapping
|>>away to someone sitting in their shack in town.

|>>Is there more than that?
|>----------------------------------------------------------------------------
---------------------------------------
|>You have found nirvana.  Radio nirvana at least. How many find
|>that in ANYTHING these days..or have the focus to bother?
|>They could have used you on that flight that crashed in the Andes
|>(survival) where they tried to get that radio going.

|>I have plans to use the VCO output of a 2010 sony to make a
|>"buddy 2010 Xmitter". QRP naturally.
|> - Tony WW2W
|>p.s. - I have to post "looking for 2010 service manual 1st" - any
|>ideas/comments on this?



73 from Amateur Radio AF4K  /  G3XLQ
http://www.mnsinc.com/bry
E-mail:  [e-mail]
Home of MEGALIST ham radio files, pirate links etc. etc.



From [e-mail] Fri Nov 08 22:00:52 1996
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From: [e-mail] (Thom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Folded Dipole
Date: 6 Nov 1996 02:25:50 GMT
Organization: LI Net (Long Island Network)
Lines: 15
Message-ID: <55osve$[e-mail]>
NNTP-Posting-Host: linet01.li.net
X-Newsreader: TIN [version 1.2 PL2]

Hi and thanks in advance for your help,

  I was wondering if it is possible to use 400 ohm ladder line for a
folded dipole...not as the feedline but rather as the dipole itself.

It would seem that by shorting the ends and feeding it in the center that
it would be quite easy...what am I missing?

Thanks again
Tom
WB2QDG

[e-mail]




From [e-mail] Fri Nov 08 22:00:53 1996
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From: [e-mail](TIMOTHY P KERBER)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.swap
Subject: FS:  Kenwood TM733 Dual band mobile
Date: 6 Nov 1996 02:35:48 GMT
Organization: Netcom
Lines: 19
Message-ID: <55oti4$[e-mail]>
NNTP-Posting-Host: col-sc1-14.ix.netcom.com
X-NETCOM-Date: Tue Nov 05  8:35:48 PM CST 1996
Xref: news1.epix.net rec.radio.amateur.antenna:31164 rec.radio.amateur.equipment:41880 rec.radio.amateur.homebrew:20839 rec.radio.amateur.misc:117674 rec.radio.swap:94023

Hello and thanx for reading this message.

I have a mint condition Kenwood TM 733   2m/440 dual band
50/35 watts, with detachable face.

Included is the $100.00 separation kit, external duplexer, external
speaker, and mobile antena (dual band), new $15.00 packet data cable
(1200/9600 bps capable), original box, and manual.
  I still have the registration card in the box.

I am asking $550.00 obo.  I am a very motivated seller, and this would
make a great Christmas gift!

REPLY ONLY TO MY E-MAIL ADDRESS:  [e-mail]
             OR
Telephone  [phone]

Thank you
Tim   N7unh/4


From [e-mail] Fri Nov 08 22:00:54 1996
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From: Joe Leikhim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Real Dogs
Date: Tue, 05 Nov 1996 22:06:36 -0500
Organization: CMDS News machine
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]>
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[e-mail] wrote:
>
> Can anyone help me identify a source for ultrasonic transducers? I have
> neighbors with dogs that preclude my needs for an alarm clock, and trying
> to get the neighbors attention has been fruitless. I'd like to get the
> dogs attention with approx 20 KHz energy.

Check some audio speaker catalogs for a tweeter manufactured by
Motorola. These small black plastic horns contain a piezo element and
are good for a few watts. put a few in parallel to dissipate the power.

--
Joe Leikhim
[e-mail]
"tv dinner by the pool,
i'm so glad i finished school"-F.Zappa 1967




From [e-mail] Fri Nov 08 22:00:55 1996
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From: Joe Leikhim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 6 meter Tube amplifier 4 sale
Date: Tue, 05 Nov 1996 22:11:07 -0500
Organization: CMDS News machine
Lines: 11
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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X-Mailer: Mozilla 2.01 (Win95; U)

If you are looking for some push pull power for six meters I have got it
for you. This is a commercial amplifier with two 4X125 tubes in push
pull. These will run class AB1. I have the amplifier chassis only no
power supply. $150

--
Joe Leikhim
[e-mail]
"tv dinner by the pool,
i'm so glad i finished school"-F.Zappa 1967



From [e-mail] Fri Nov 08 22:00:56 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!panix!newsfeed.internetmci.com!in1.uu.net!news.iij.ad.jp!wnoc-tyo-news!sinfony-news!sonygw2!oskgw!news
From: Peter Shintani <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: need info on ICOM FL-223 filters(9 MHz)
Date: 6 Nov 1996 03:13:27 GMT
Organization: Sony Japan
Lines: 22
Message-ID: <55ovon$[e-mail]>
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Hi:
        I bought an FL-223 narrow ssb filter for my Icom IC -706.
I am disappointed with it's performance. Either it has poor
attenuation or there is too much blow by on the
PCB.
I took it out of my rig and measured it at work.
It is suppose to be 1.8 kHz wide at - 6 dB.
I measured it on an HP -4194A gain phase analyzer.
I had the termination impedance set at 2.2kohms for the filter
and I measured 2100 Hz for the -6 dB bandwidth. Furthermore the
absolute stop band attenuation was only 45 dB peak on the top side and
55 db peak on the lower side.

I am wondering if anyone knows of either a better 9.0115 MHz filter
that can be used in place of the FL-223 or if there is a simple way
of cascading the  stock filter with the optional narrow filter or
if anyone has been successful in making a homebrew ladder filter
replacement.

Peter




From [e-mail] Fri Nov 08 22:00:57 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bi-polar Proms
Date: 6 Nov 1996 03:21:55 GMT
Lines: 20
Message-ID: <55p08j$17ia$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: slip166-72-88-151.mn.us.ibm.net
X-Newsreader: IBM NewsReader/2 v1.09

Bi-polar proms are a one time shot. They are programed by blowing fuses within
the memory array. Eproms put a charge on a floating gate and can be erased
by UV light and reprogrammed. The bi-polar were faster in the old days by a fa
ctor
of 10 to 20 . More recent Eproms have narrowed that gap.

In <[e-mail]>, [e-mail] (Alex Szo
pko) writes:
>Hi everybody!
>
>I have a problem again.What is the difference between an E-PROM and a
>
>BI-POLAR PROM ? Can you program a BI-POLAR PROM on an E-PROM programer,
>
>as far as I know E-PROM is erasable and the BI-POLAR PROM is not.
>
>Is that the only difference?
>
>Please help
>
>                        73's Alex VK7CS



From [e-mail] Fri Nov 08 22:00:58 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 5 Nov 1996 22:27:33 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 57
Sender: [e-mail]
Message-ID: <55p0j5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.news-fddi.aol.com
X-Newsreader: AOL Offline Reader

Hi Jesse,

First of all, I never said the nichrome was harmful. It is a less than
desirable way to do the job, but anything that gets the job done is OK by
me.

The things I object to (concerning parasitics) is this:

Everything gets blamed on them. Tank caps arcing, tube failures,
bandswitch failures, relays arcing WHILE THE AMP IS ON STANDBY,  meter
failures, diode failures, and so on. That's pure bunk, and we are
threading our way through that.

Every failure has a cause, and they are generally easy to determine. It
would be nice to have one thing that causes all the problems in the world,
we all love simple one cause explainations.

In article <[e-mail]>, [e-mail] (W6KKT
Jesse) writes:
>I installed the low Q suppressors as precautionary measure, in two
>Henry, one Heathkit SB220, and a 4-1000 amp.  The change that I
>noticed was the amplifiers seemed to tune "smoother", elimination of
>the random rf "popping", and had about a 0.5db loss of power on 10
>meters.

Esoteric testimony always includes works like "seemed". Another person
posted he used nichrome in his 220, and still had problems. Perhaps we
should destroy all the textbooks, and go by public poll? Then we won't
learn anything.

The 220 has one major design defect. The grid chokes (I already posted
this) WERE an engineering mistake. Look back and you'll find it. That
mistake is an interesting topic all on its' own.

>Will I take them out because of the recent negative
>threads as to their use posted in this group and written in QST?

That's a disappointing comment. Everyone has a chance to look at the facts
here. Just because a few outlandish claims are being taken apart
technically this should be viewed as negative.

All the data I've given can be verified. This is science, and simple
theory. We are just getting into the real reason WHY an amplifier arcs.
Once that's all covered, IF we can stay on track, you can decide what to
do because you'll know exactly why failures happen. None of it is strange,
and all of it has very good easy to understand reasons.

Personally, I think we are covering things pretty well. If something
doesn't make sense pipe up. I can't argue feelings or personal opinion,
but with over $100k of RF test equipment and dozens of PA's here I sure
can measure things. If you have a $169 MFJ 259 you can measure the same
things with less accuracy.

Let's stay with theory, measurements, and documents. Otherwise we'll never
get to the real problems.

73 Tom


From [e-mail] Fri Nov 08 22:00:59 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: DTMF Decoding Software available
Date: 6 Nov 1996 03:46:09 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 15
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news-fddi.aol.com

Hi,

Please check out my window's DTMF decoding software at:

http://home.aol.com/pdrunen

If you can not connect to the site, please reply with e-mail address and I
will upload it to you!

[e-mail]

DTMF stands for Dual Tone Mult-Frequency and they are the tones you hear
when you dial on a telephone.  These analog signals are turned into binary
signals a computer can understand and displayed on the computer screen.



From [e-mail] Fri Nov 08 22:01:00 1996
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From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bi-polar Proms
Date: Tue, 05 Nov 1996 22:46:44 -0500
Organization: ORION Microsystems
Lines: 44
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dynamicppp-8.hip.cam.org
Mime-Version: 1.0
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Alex Szopko wrote:
>
> Hi everybody!
>
> I have a problem again.What is the difference between an E-PROM and a
>
> BI-POLAR PROM ? Can you program a BI-POLAR PROM on an E-PROM programer,
>
> as far as I know E-PROM is erasable and the BI-POLAR PROM is not.
>
> Is that the only difference?

Hi Alex,

Bipolar PROMs are generally TTL or ECL. They are programmed by
fusing Ni-Cr links organized generally in a matrix (or mask
programmable at factory if you buy by 10,000 :) They are very
fast in the 5 to 50 ns range generally.

EPROMs and EEPROMs are most of the time CMOS and programmed by
charging/discharging small "capacitors" inside. They are erased
by exposition to UV (EPROM) EEPROM are Electrically erasable...
If you make a mistake you erase and redo.

Programming is different in Voltage and timing. Small Bipolars
can be programmed by hand (switch bank for address, for data and
push button to ...program) if you know how much Voltage and current
is needed to fuse the link. If you make a mistake the PROM is finished!

I have seen some PC cards which could program common EPROMs but
it is expensive for a one shot operation. Some dealers do the
programming for a small fee (10$) if you can bring the binary
file to do it (generally Intel Hex format).

If you go to my page, there are some Electronic Links to most
manufacturers and other info on components etc. You may even
find the spec sheet for your PROM/EPROMs

Good luck with your project :)
-------------------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows




From [e-mail] Fri Nov 08 22:01:01 1996
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From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Diodes: Everything you wanted to know
Date: Tue, 05 Nov 1996 22:55:46 -0500
Organization: ORION Microsystems
Lines: 11
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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X-Mailer: Mozilla 3.0 (Win16; I)

All your questions about all type of diodes from the trival
to the sublime in one FAQ document:

http://www.avtechpulse.com/faq.html#lv.1-ge

Picture is 35Kv/50A "rectifier"
http://www.avtechpulse.com/images/diode.jpg
-------------------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows



From [e-mail] Fri Nov 08 22:01:01 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cam-news-hub1.bbnplanet.com!uunet!in3.uu.net!newsgate.compuserve.com!ix.netcom.com!news
From: [e-mail](Stanley D Gruver)
Newsgroups: rec.radio.amateur.homebrew,rec.video.marketplace,
Subject: Satellite Receiver  FOR SALE  ****CHEAP****
Date: 6 Nov 1996 04:20:10 GMT
Organization: Netcom
Lines: 16
Message-ID: <55p3lq$[e-mail]>
NNTP-Posting-Host: tul-ok7-13.ix.netcom.com
X-NETCOM-Date: Tue Nov 05  8:20:10 PM PST 1996
Xref: news1.epix.net rec.radio.amateur.homebrew:20830 rec.video.marketplace:1508

USED

Toshiba TRX 80 with VC2+       $275
Panasonic 4500 with VC2+       $275
Chaparral feedhorn             $ 20
Norsat 35-40 degree LNB        $ 20
Von Weise 24" actuator         $ 25
VC2+ descrambler               $150

Receiver/VC2+/feedhorn/LNB/actuator/new 7.5' Perfect 10 mesh dish

Complete system for only $500

E-mail reply please

Thanks,  Maura


From [e-mail] Fri Nov 08 22:01:03 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 06 Nov 1996 04:26:22 GMT
Organization: INTERNET AMERICA
Lines: 26
Message-ID: <55p410$[e-mail]>
References: <55m4vm$[e-mail]> <55ola0$[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (W8JI  Tom) wrote:

>There are two self-resonant points of the Oren Elliot 250 pF capacitor
>used in the AL80B

I guess my point, apparently not well made, was that the reactance
appearing at the anode was high at VHF not because of the physical
capacitor itself.  Rather, the topology of the amplifier usually
involves significant series reactance in the connections to and from
the capacitor.  The net effect would be to place a fairly high
impedance at the anode at VHF.

This is a triumph of supposition over science since I've not measured
any of my amplifiers to see just what the value is.  I'm just
extrapolating from what I've seen in large HF amplifiers.  When we
don't use vacuum variables (where it's easier to control the lead
inductance) the net series reactance of the tuning capacitor
connection can be quite high at VHF.


Fred

[e-mail]
[e-mail]
[e-mail]



From [e-mail] Fri Nov 08 22:01:03 1996
From: [e-mail] (rew5808)
Subject: wtb: knight kit walkie talkie and shortwave
Date: Wed, 06 Nov 1996 05:46:02 GMT
X-Newsreader: Forte Free Agent 1.0.82
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Lines: 7
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!news2.digex.net!news7.digex.net!news.reallink.com

can anyone help me find a pair of knight-kit c-100 walkie talkies from
the early 60's???  they were blue three transistor 100mw units.

also looking for a knight "span master" 4 band short wave receiver
from
the same time period.

thanks
bobby
wb5wur



From [e-mail] Fri Nov 08 22:01:04 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!news.sgi.com!sdd.hp.com!night.primate.wisc.edu!newsspool.doit.wisc.edu!news.doit.wisc.edu!f209-183.net.wisc.edu!user
From: [e-mail] (Jeff Bross)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Take a break, huh?
Date: Tue, 05 Nov 1996 22:20:04 -0800
Organization: University of Wisconsin, Madison
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: f209-183.net.wisc.edu

In article <[e-mail]>, Woody White
<[e-mail]> wrote:

> Could this possibly be posted to the WRONG homebrew group ;-)
> _Woody_
Possibly, but I don't really give a shit. Seems that you may be good at
WAISTING your time, so WASTE some time and fill out my damn survey.

--
please reply to [e-mail]


From [e-mail] Fri Nov 08 22:01:06 1996
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From: [e-mail] (Jimmy Navarro)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.space
Subject: Re: ELECTRONICS TIMES publisher is sick?
Date: 6 Nov 1996 07:28:02 GMT
Organization: L A Free Net
Lines: 64
Message-ID: <55pem2$[e-mail]>
References: <55hmv4$[e-mail]> <[e-mail]> <55lmo4$[e-mail]>
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I leave in Eagle Rock and always used the MARS repeater using high
power mobile rig.  Lately I can't even make a call.  You people are the
ones who are suppose to go to 222 MHz because those people got their
first. I too got intimimated with that QST, gave a call to one of MARS
people, it's phony.  I wouldn't even give a damn to SCARA or whoever in
that Santiago Peak group.  Oh well, Mr. Dengler, KE6TZF is Sunset Ridge
Repeater group.  You're one of those people jamming.  I was wondering
may be you people are getting a lot high power RF's being radiated
right in your head like those guys at 147.435?  If you've been using
MARS 446.650, would this mess will make you happy?  I should say 73 but
don't which is appropriate this time.  May be KJ6TQ would no better...
 (=:
:DE KE6FPK
In article <55lmo4$[e-mail]>, [e-mail]
says...
>
>In <[e-mail]>, Tim Hynde <[e-mail]> writes:
>>>James Lee wrote:
>>
>>> Mike Mercado or KM6NP, who publishes the Electronics Times, even
>>> installed transmitter just for the purpose of jamming KJ6TQ
>>> operations and periodically broadcast warning to KJ6TQ repeater's
>>> users.
>>>
>>> Ham radio operators pride themselves in being polite.  Yeah right!
>>
>>Well, there are still plenty of gentlemen operators left.
>>
>>.... and all that wide open space on 6m and 220 MHz ??...
>
>Excuse me, 'wide open space' on 222 MHz?  Then why did the last 220
SMA meeting
>feature a hearing due to a denial of freq. coordination to a repeater
on Blue
>Ridge, and why were there 2 freq. coordinators on 222 MHz in So. Cal.
for a
>while?  The 222 MHz band may not be used as much as 2 meters, but it's
stuffed
>full of repeaters.  There is some room on 6m, but it's awfully noisy.
>
>I'm not sure we can blame Mike for the mess on 446.65.  He is only a
pawn of
>SCRRBA, which apparently decided that the frequency shall not have an
'open'
>repeater on it.  The 'warning' transmitter cites references to SCRRBA
>coordination, but makes no mention of possible coordination of KJ6TQ
by other
>freq. coordination entities, so it is not accurate to say that any
other
>repeater on the freq. is uncoordinated.
>
>Bob NO6B (KE6TZF)
>
-------------------------------------------------------------------
KE6TZF      SUNSET RIDGE REPEATER GROUP             LIC ISU 15-MAY-1995
CLUB        P. O. BOX 412                           LIC EXP 15-MAY-2005
            WALNUT               CA  91788-0412     LST UPD 15-MAY-1995
NO6B        DENGLER, ROBERT J                        IS RESPONSIBLE

NO6B               DENGLER, ROBERT J                LIC ISU 27-OCT-1987
EXTRA              10946 KANE AVE                   LIC EXP 27-OCT-1997
DOB  4-JUL-1963    WHITTIER             CA  90604   LST UPD 27-OCT-1987
                   (PREVIOUSLY WA6ZGQ, ADVANCED)



From [e-mail] Fri Nov 08 22:01:08 1996
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From: [e-mail] (larry wolken)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.electronics.equipment
Subject: Re: BIRD 43 Help/Tutorial
Date: Wed, 06 Nov 1996 07:58:46 GMT
Organization: Netcom
Lines: 35
Message-ID: <55p372$[e-mail]>
References: <01bbcb72$93899c00$01a447cc@desktop> <[e-mail]>
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[e-mail] (Tom Dunn) wrote:


>> Can someone kindly point me to a tutorial on the Bird 43 watt meter.  Just
>> got one used without a manual.  They look very simple to use.
>>
>> I do have a RF Sampler fitted - what range out output does this have? -
>> would hate to blow my frequency meter or o-scope.!
>>
>> Thanks a million for reading.
>>

>> Bob Smith    N3FTU
>> Atlanta, GA

>Bob: If you have the Bird model 4430 with interal sample port coming out
>the side. The specs from Bird catalog are "RF coupling -53db from 512MHz
>to 10Mhz, decreasing to -70db between 10MHz and 2MHZ". If you have the
>sampler that bolts in series with the coupler model 4275 (20-1000MHz) or
>model 4273 (1.5-30MHz) the  coupling is adjustable from -35db to -70db,
>with quite a bit of roll off(less coupling) as you go lower in frequency.
>73  Tom WB6IQD   [e-mail]

Howdy Bob --

Bird takes their customer service seriously.  They're a great
corporation.  Just give them a call in Solon (Cleveland) Ohio and
request an operator's manual.  They will very likely send you one
cheaply or free -- just make sure to have the model number.

BTW you won't hurt your scope or counter just plug it in and go to
town.





From [e-mail] Fri Nov 08 22:01:10 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.vcnet.com!port27.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: to
Date: Wed, 06 Nov 1996 01:07:52 -0700
Organization: Internet Access of Ventura County
Lines: 90
Message-ID: <[e-mail]>
References: <[e-mail]> <55olgo$[e-mail]>
NNTP-Posting-Host: port27.vcnet.com

In article <55olgo$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> Hi Rich,
>
> This has nothing to do with theory, but I'll comment anyway.
>
snip...
> Let me see if I follow this. Someone else opened the tubes and told Foote
> the damage was caused something other than excessive current.

No.  The tube engineer reportedly told Foote that the damage was caused by
excess grid current.

>Next Foote
> told you what that person told him verbally, and now you are telling us.

Yes.  Judge Lance Ito would never allow it to be entered as evidence.

> I wonder who the source engineer was and what were his exact words were.
> Do you have a letter from him?
...no letter.  The tube engineer reportedly tested the tubes and found
them to be leaky.  Next he cut off the anodes in a lathe so he could see
the insides.  He reported his findings to Mr. Foote.  I confirmed the
theory by inspecting the insides of kaput tubes with a microscope.  Have
you looked at the insides of kaput tubes with a microscope, Tom?


> You have stated:
>
> 1.) That a tube grid can not be damaged from fundamental frequency
> excitation.

Not true.  In "Parasitics Revisited" I stated that grid to cathode shorts
can result from over excitation at the operating frequency.  A photo of a
thusly damaged tube is shown.  The grid to cathode shorts were caused by
flakes of emissive coating being stripped off the cathode by more than
twice the rated drive being applied.  No evidence of gold sputtering is
present.  For comparison, another tube is shown with evidence of gold
sputtering damage.

> 2.) That electronic protection should be removed

 If the existing grid-protect switch transistor is shorted and the tube is
kaput, would you conclude that the grid protection circuit worked
properly, Tom?

> 3.) That resistors make good fuses, and fuses are alos good for protecting
> grids.

Not all types of resistors make good fuses.  If a 0.5w-rated resistor was
in series with a 4w rated grid, which would you expect to fail first?

> 4.) That skin effect causes gold to leave before the base metal

Yes, but only if the gold is elevated above 2000 degrees F.

> 5.) That gold only leaves when it boils

Not necessarily.  Water can evaporate without boiling.  In a vacuum, gold
just begins to evaporate at 2000 degrees F.  At atmospheric pressure it
takes more than 3500 degrees F to evaporate gold.

> All of which are untrue.

I don't think so.
>
> >However, when gold sputtering takes place at the same
> >time that tune capacitor arcing takes place, in an amplifier that was
> tuned
> >up correctly, an atypical event probably took place.
>
> Now let's see if I follow this, if the capaciator arcs at the same time
> the tube fails, ....snip.

No.  The tube oscillates at VHF.  Since the VHF energy is blocked by the
HF tank, there is virtually no VHF load, which results in high grid
current.  If a VHF arc forms in the anode circuit,  the arc presents a low
Z load to the anode, and the grid current decreases.

> If the PA is underloaded and excitaion remains at a high level, several
> things go on.

Some amplifiers appear to sustain VHF parasitic oscillations when they are
correctly loaded.
--------------------------
e-mail copy to Mr. Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:01:10 1996
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From: [e-mail] (larry wolken)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Soldering small connections
Date: Wed, 06 Nov 1996 08:08:31 GMT
Organization: Netcom
Lines: 6
Message-ID: <55p3p9$[e-mail]>
References: <54shd8$[e-mail]> <[e-mail]>
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Gary --

Howdy. I'm just a bystander passing through your post but  I'm blown
away.  What an elegant explanation.  Thanks for the info and the
patience to impart it.... The web at its best.



From [e-mail] Fri Nov 08 22:01:11 1996
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From: [e-mail] (larry wolken)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Soldering small connections
Date: Wed, 06 Nov 1996 08:11:54 GMT
Organization: Netcom
Lines: 7
Message-ID: <55p3vm$[e-mail]>
References: <54shd8$[e-mail]> <[e-mail]>
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X-NETCOM-Date: Tue Nov 05 10:25:26 PM CST 1996
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Gary --

Howdy. I'm just a bystander passing through your soldering small
connections post but  I'm blown away.  What an elegant explanation.
Thanks for the info and the patience to impart it.... The web at its
best.



From [e-mail] Fri Nov 08 22:01:12 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Take a break, huh?
Date: Wed, 06 Nov 1996 00:41:48 -0800
Organization: http://geocities.com/capecanaveral/3722
Lines: 24
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References: <[e-mail]>
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Could this possibly be posted to the WRONG homebrew group ;-)
_Woody_

Jeff Bross wrote:

> 8. Do you drink alcoholic beverages? Yes___  No____ (If │No▓, go to number
20)
>
> 9. About how often do you drink?  1 to 2 days a month____
>                 1 to 2 days a week_____
>                 More than twice a week______
>                 Almost every day_______
>
> 10. About how much do you spend on alcohol per week?
>                        $0-$5______

> please reply to [e-mail]

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Fri Nov 08 22:01:14 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 06 Nov 1996 02:18:40 -0700
Organization: Internet Access of Ventura County
Lines: 46
Message-ID: <[e-mail]>
References: <55m4vm$[e-mail]> <55ola0$[e-mail]>
NNTP-Posting-Host: port21.vcnet.com

In article <55ola0$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In article <55m4vm$[e-mail]>, [e-mail] (J. Fred
> Riley) writes:
>
> >
> >I think we have to assume, given what we know about real components,
> >that the tuning capacitor has long since gone series resonant and
> >probably appears, at VHF as a rather high value of inductive
> >reactance.
>
> Not at all Fred.
>
> There are two self-resonant points of the Oren Elliot 250 pF capacitor
> used in the AL80B withing the range of my 1-1000 MHz Impedance analyzer.
>
> With the cap open, the series resonant point is 489.1 Mhz where it looks
> like .23 ohms j0 and another where at 570.74 MHz where it measures  14.1
> ohms j 0.
>
> These points move to 170.4 and 289.9 MHz when the cap is meshed. I can
> find no anti resonant impedance in the range of 1 to 1000 MHz.
>
> You'd be in radio hell trying to drive that cap with RF at VHF or UHF and
> make it arc.
>
We agree on this one, Tom.  I have never heard of a tune cap arcing in an
AL-80.  Congrats to Denny Haad.   However, I have heard about a number of
bandswitch arcs in AL80s.  According to QST's  Paul Pagel, N1FB, Tom Rauch
received some telephone calls from Ameritron owners regarding this problem
shortly after "Parasitics Revisited" showed a photograph of a similar,
parasitic-arced bandswitch (p.33 10/90 QST).  A ham in San Diego told me
he went through two bandswitches in his AL80.  There should be no reason
for bandswitch arcing.  The measured breakdown of the AL80's bandswitch is
Much higher than the anode supply voltage.
 During Operation Desert Storm, I received a letter from a ham/serviceman
who was running an AL80 at a MARS station somewhere in the Arabian
desert.  He said that he was seeing intermittent bandswitch arcing.  After
lower Q suppressors were installed, the bandswitch arcing reportedly
stopped, despite the dusty environment.
-----------------------
e-mail copy to Mr. Tom Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:01:14 1996
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From: [e-mail] (Ford A R)
Newsgroups: rec.radio.amateur.homebrew
Subject: PCB Designing at high Frequency
Date: 6 Nov 1996 09:41:01 GMT
Organization: The University of Newcastle
Lines: 21
Message-ID: <55pmfd$[e-mail]>
NNTP-Posting-Host: alinga.newcastle.edu.au
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]

hi!

I'm a naive newbie and i would really appreciate it if someone could
direct me to, say, a WWW page or a FAQ on designing electronic circuits
that involve high frequency RF applications (i.e greater than 200,300Mhz
up to the 2Ghz Range)

I've heard that a tequnique called "strip lining" is used. Can anyone
explain that to me (I'm probably making an idiot of myself asking these
questions)

I know that circuits dont abey "normal" laws when there are high frequency
RF signals involved, adn since i only know about the "normal" rules I'm
completely i the dark when it comes to designing for higher frequency RF.


Thanks very much in advance,

alan ford




From [e-mail] Fri Nov 08 22:01:15 1996
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From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need hard to find parts!
Date: 6 Nov 1996 05:07:28 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 9
Sender: [e-mail]
Message-ID: <55po10$[e-mail]>
References: <[e-mail]>
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X-Newsreader: AOL Offline Reader

I certainly enjoy the fact that you would like to build some HF gear.
It is the most rewarding aspect of this hobby.

The book"Solid State Design" is a great book for builders.

My copy is about to fall apart from use and age.

Carl
N9EFJ


From [e-mail] Fri Nov 08 22:01:16 1996
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From: Tim Dicus <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Date: Wed, 06 Nov 1996 02:35:59 -0800
Organization: Prolectron
Lines: 22
Message-ID: <[e-mail]>
References: <55h7bp$[e-mail]>
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Xref: news1.epix.net sci.electronics.design:24820 rec.radio.amateur.homebrew:20836

Maroof H. Choudhury wrote:
>
> Most common PLL(like the NE564/565) application-notes/data-sheets say that
> the PLL can be used for AM detection/demodulation. But I haven't seen any AM
> demodulator using a PLL. Can anyone show a few examples of such ckts?
> Thanks
>
> Maroof

I found a schematic using a NE568 as an AM detector. It is in National
Semiconductor's data book. I have an older version, but I would imagine
it is in the new version too.

It is too complex to be entering into my computer, so I'm not doing that.

If you can't locate it anywhere else, send me an e-letter and I'll fax it
to you.

--
Tim Dicus
Destin, Florida
e-mail [e-mail]


From [e-mail] Fri Nov 08 22:01:18 1996
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From: [e-mail] (Codys PC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NBFM modulator: design wanted
Date: 6 Nov 1996 06:32:28 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 35
Sender: [e-mail]
Message-ID: <55pt0c$[e-mail]>
References: <55mr2q$[e-mail]>
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In article <55mr2q$[e-mail]>, [e-mail]
(Maroof H. Choudhury) writes:

>Can anybody suggest a simple design of a narow band frequency
>modulator for Citizen's band?
>
>

Check out the Op-Amp cookbooks and Linear Series manuals for the
following...

AN612, and TA7320P...These are quite popular in CB radios.  NTE and ECG
don't have much, Motorola will have more info for you - and you can search
for their website for this info. NEC, National Semiconductor and TI also
have websites - I don't know if they would have much information for you.

TA7320P is often used as a low level modulator mixer/combiner for SSB and
AM/FM use.  It has also been used as a demodulator for IF derivatives in
some radios.

AN612 is used for filtering the voice into a unity gain voltage
regulator/buffer for mixing into a precise frequency for use in band pass
crystal lattice networks for AM/FM/SSB before being passed on to the
TA7320P for final processing and mixing to get the derived frequency
selection from a standard reference and the, now-modulated, IF frequency
of audio.

Linear series reference manuals are for the pinouts and Op-Amp cookbooks
may have a schematic or two to help develop your idea from. Or cannabalize
old radio manuals for engineering schematics to help you figure out the
idea.

Good luck! Happy hunting!

:+> Andy <+:


From [e-mail] Fri Nov 08 22:01:19 1996
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From: "James R. Chastain" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew radar
Date: 6 Nov 1996 12:30:43 GMT
Organization: Preferred Internet Inc.
Lines: 19
Message-ID: <01bbcbf3$df68cf20$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 207.159.71.222
X-Newsreader: Microsoft Internet News 4.70.1155

Hi,
        If you find out anything, I would apreciate hearing it too.
        I have several 10GHZ gunplexers and a 10 WATT
        TWT amp that would do great for this.

                        Thanks and God Bless,
                                        Rod

Daniel S Nixon <[e-mail]> wrote in article
<[e-mail]>...
> I would like to build a weather radar for a thesis project in a couple
> of years time using a PC for signal processing and display.  Does anyone
> have any suggestions on where to start or where to find information that
> would be useful for such a project?
>
> Thanks in advance,
>
> Dan.
>


From [e-mail] Fri Nov 08 22:01:20 1996
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From: [e-mail] (Mike Stansberry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Take a break, huh?
Date: 6 Nov 1996 13:51:50 GMT
Organization: HP Colorado Springs Division
Lines: 11
Message-ID: <55q55m$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
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X-Newsreader: TIN [version 1.2 PL2]

Jeff Bross ([e-mail]) wrote:
: In article <[e-mail]>, Woody White
: <[e-mail]> wrote:

: > Could this possibly be posted to the WRONG homebrew group ;-)
: > _Woody_
: Possibly, but I don't really give a shit. Seems that you may be good at
: WAISTING your time, so WASTE some time and fill out my damn survey.

Go Away.



From [e-mail] Fri Nov 08 22:01:21 1996
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From: [e-mail] (R.L. Measures)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 06 Nov 1996 07:45:57 -0700
Organization: WestNet
Lines: 27
Message-ID: <[e-mail]>
References: <[e-mail]> <55p0j5$[e-mail]>
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In article <55p0j5$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> Hi Jesse,
>
> First of all, I never said the nichrome was harmful. It is a less than
> desirable way to do the job, but anything that gets the job done is OK by
> me.
snip.......

 The main difference between VHF-parasitic oscillation suppressors made
with nichrome and those made with silver-plated copper is the resultant Q
in the anode's VHF-resonant circuit.   The differerence in Q can be seen
with a dipmeter.  Silver-plated copper suppressors produce a sharper dip
than nichrome suppressors.

 Tom:   Are you saying that higher VHF-Q provides better VHF dampening than
lower VHF-Q?

 The lossy parasitic suppressor inductor is nothing new, Tom.  F. E. Handy
told us about it in the 1926 and 1927 *Radio Amateurs Handbook*.
---------------------------------
e-mail copy to Mr. C. Tom Rauch

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:01:22 1996
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From: [e-mail] (R.L. Measures)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 06 Nov 1996 08:04:00 -0700
Organization: WestNet
Lines: 24
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In article <[e-mail]>, Zack Lau <[e-mail]> wrote:

snip....

> Being a "single frequency area problem", what do you think about using
> inductive resistors in a clever design?

snip...

 The resistance-wire VHF parasitic-suppressor inductor, recommended by Mr.
F. E. Handy in the 1926 Edition of the *Radio Amateur's Handbook* sounds
like the very design you are suggesting, Zack.  I believe it's clever.
Dipmeter tests of relative VHF-Q confirm that the idea of using resistive
VHF oscillation suppressor-coils is valid.  Mr. Handy said:
 "The combination of both resistance and inductance is very effective in
limiting parasitic oscillations to a negligible value.".

 Apparently, Mr. Rauch does not agree.
-----------------------------------
e-mail copy to Mr. Zack Lau

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:01:23 1996
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From: Walter Rawle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew radar
Date: Wed, 06 Nov 1996 07:28:33 -0800
Organization: Ericsson Data Services Americas
Lines: 12
Message-ID: <[e-mail]>
References: <55mnmq$[e-mail]> <[e-mail]> <327f7e3c.2988795@204.127.3.4>
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David Copperhead wrote:
>
> I once saw an article on converting your microwave oven to a radar
> system...think it was in RF Design Magazine...can't remember what
> issue though.

Microwave ovens operate at 2450 Mhz. At this longer wavelength,
hydrometeor radar cross section decreases, see for example, Balanis -
Advanced Engineering Electromagnetics. Further, the oven may be pressed
into service for a transmitter. You still need a receiver and antenna

walter rawle VE1AWS/w4


From [e-mail] Fri Nov 08 22:01:24 1996
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From: Walter Rawle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB Designing at high Frequency
Date: Wed, 06 Nov 1996 07:49:59 -0800
Organization: Ericsson Data Services Americas
Lines: 53
Message-ID: <[e-mail]>
References: <55pmfd$[e-mail]>
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Ford A R wrote:
>
> hi!
>
> I'm a naive newbie and i would really appreciate it if someone could
> direct me to, say, a WWW page or a FAQ on designing electronic circuits
> that involve high frequency RF applications (i.e greater than 200,300Mhz
> up to the 2Ghz Range)
>
> I've heard that a tequnique called "strip lining" is used. Can anyone
> explain that to me (I'm probably making an idiot of myself asking these
> questions)
>
> I know that circuits dont abey "normal" laws when there are high frequency
> RF signals involved, adn since i only know about the "normal" rules I'm
> completely i the dark when it comes to designing for higher frequency RF.
>
> Thanks very much in advance,
>
> alan ford

Alan:
At high frequencies, all PCB interconnects are modelled as transmission
lines, specifically - microstrip transmission lines - hence the reference
to strip lining. A microstrip transmission line is a flat ribbon
conductor on a ground plane backed dielectric material. At frequencies
below 1 Ghz microstrip line is relatively well behaved - there are well
known equations which you can use to calculate the transmission line
parameters - these parameters are derived from what is referred to as the
quasi static approximation. Above 1 Ghz microstrip lines radiate, so
precisely evaluating their behaviour is more difficult.
  For multi layer boards, where the interconnects are embedded between
layers, the transmission lines are striplines. A stripline is a ribbon
sandwiched in a dielectric material with ground plane both top and
bottom.
  There are a number of good textbooks available for microstrip and
stripline design. Pozar's "Microwave Engineeering" or Collin's
"Fundamentals of Microwave Engineering" both have good illustrationsand
design equations. Also, microwave CAD software can be used to evaluate
the effects of the interconnects.
A good data point: .110 inch ribbon on 0.016 inch FR4 = 50 ohm
transmission line
From a circuit perspective, the length of the interconnect will change
the observed terminal impedance of the connected components. In the
frequency domain, impedance mismatch will result in a reduction in
transferred power, the establishment of standing wave patterns on the
interconnects with resulting coupling and radiation. In the time domain,
multiple reflections will distort the transmitted waveforms, among other
things.
I hope this short primer is helpful. email me if you have further
questions

walter rawle VE1AWS/w4


From [e-mail] Fri Nov 08 22:01:25 1996
Newsgroups: rec.radio.amateur.homebrew
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From: Earl Morse <[e-mail]>
Subject: 2 meter/440 amp project
Message-ID: <[e-mail]>
Sender: [e-mail] (System Administrator)
Mime-Version: 1.0
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Looking to do a club project.  A 2 meter or 440 amplifier (or both?)
seems to be a popular choice.  Criteria are simplicity, frugality, and
ease of construction and operation.  Anybody point me in the right
direction for a cookbooked design for an FM amp in the 1-5 watt in/10-25
watt out category.

Earl N5TU
[e-mail]


From [e-mail] Fri Nov 08 22:01:26 1996
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From: Phil <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics
Subject: Re: NBFM modulator: design wanted
Date: 6 Nov 1996 17:48:26 GMT
Organization: Xyplex, Inc.
Lines: 13
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References: <55mr2q$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:20827 rec.radio.cb:37315 sci.electronics.design:24807

About the simplest NBFM modulator that you can build is a variable
capacitance modulator using a varactor diode as the active component.
When properly biased, this device will give you a frequency swing of up to
7.5khz deviation (on some) which you can easily control to the desired
5khz. The device is installed at the oscillator tuning circuit and causes
an increased/decreased capacitance in that tuning circuit which
effectively changes the frequency of the oscillator with respect to the
audio signal that is riding on top of the bias voltage.

Whew! Now! Demodulating is another problem!

Hope this shed some insight! -> Phil



From [e-mail] Fri Nov 08 22:01:27 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: [e-mail] (Steve Work)
Subject: Re: NBFM modulator: design wanted
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
Date: Wed, 6 Nov 1996 19:56:07 GMT
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Xref: news1.epix.net rec.radio.amateur.homebrew:20873 rec.radio.cb:37361 sci.electronics.design:24923 sci.electronics.misc:16948

Phil ([e-mail]) wrote:
: About the simplest NBFM modulator that you can build is a variable
: capacitance modulator using a varactor diode as the active component.
: When properly biased, this device will give you a frequency swing of up to
: 7.5khz deviation (on some) which you can easily control to the desired
: 5khz. The device is installed at the oscillator tuning circuit and causes
: an increased/decreased capacitance in that tuning circuit which
: effectively changes the frequency of the oscillator with respect to the
: audio signal that is riding on top of the bias voltage.

Can anyone here spell "nonlinear", or "distortion"??


From [e-mail] Fri Nov 08 22:01:27 1996
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From: [e-mail] (Russ Renaud)
Newsgroups: rec.radio.amateur.homebrew
Subject: 70cm PLL projects
Date: 6 Nov 1996 20:41:33 GMT
Organization: The National Capital FreeNet
Lines: 7
Message-ID: <55qt5t$[e-mail]>
Reply-To: [e-mail] (Russ Renaud)
NNTP-Posting-Host: freenet5.carleton.ca
X-Given-Sender: [e-mail] (Russ Renaud)


Could anyone provide some references to recent construction articles
pertaining to 70cm or UHF PLL oscillators?

Any tips would be appreciated.

tnx de va3rr/aa8lu


From [e-mail] Fri Nov 08 22:01:28 1996
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From: [e-mail] (Thomas Mahanna)
Newsgroups: rec.radio.amateur.homebrew
Subject: Q: Xenex XV2x Compiler for DSK?
Date: 6 Nov 1996 16:36:36 -0500
Organization: ZIPNET.NET
Lines: 9
Message-ID: <55r0d4$[e-mail]>
NNTP-Posting-Host: zip1.zipnet.net
X-Newsreader: TIN [version 1.2 PL2]


Hi:
        Has anyone tried Xenex's XV2x or XV5x compilers for the TI 2x, 5x
DSP's? Sounds like an interesting product. A DOS based Signal Processing
Package for TI's 2x, 5x DSPs. Midnight engineering had an article on it
(Nov. issue, I think). Cost $99. Anyone?

-Tom



From [e-mail] Fri Nov 08 22:01:30 1996
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From: Jim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Date: Wed, 06 Nov 1996 15:56:55 -0800
Organization: Jim
Lines: 31
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
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To: Steve Work <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.homebrew:20870 rec.radio.cb:37359 sci.electronics.design:24917 sci.electronics.misc:16946

Steve Work wrote:
 >
 > Phil ([e-mail]) wrote:
 > : About the simplest NBFM modulator that you can build is a variable
 > : capacitance modulator using a varactor diode as the active
component.
 > : When properly biased, this device will give you a frequency swing
of up to
 > : 7.5khz deviation (on some) which you can easily control to the
desired
 > : 5khz. The device is installed at the oscillator tuning circuit and
causes
 > : an increased/decreased capacitance in that tuning circuit which
 > : effectively changes the frequency of the oscillator with respect to
the
 > : audio signal that is riding on top of the bias voltage.
 >
 > Can anyone here spell "nonlinear", or "distortion"??


N O N L I N E A R

I'll skip the other ...

Seriously, Steve, whats' the problem ... many commercial radios have
been
built using this technique, and, believe me, the distortion will occur
much earlier in the simple deviation limiting circuits employed before
the NBFM modulator (been there, done that ...).

Jim


From [e-mail] Fri Nov 08 22:01:31 1996
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From: [e-mail] (Zack Widup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help Identify Components
Date: 7 Nov 1996 00:00:02 GMT
Organization: University of Illinois at Urbana
Lines: 28
Message-ID: <55r8q2$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Zack Widup)
NNTP-Posting-Host: firefly.prairienet.org


In a previous article, "100116,113"@compuserve.com (Richard Ibbotson) says:

>
>I also got a "small" sheet of Rogers Duroid. When I told someone I wanted
>to process using photo etch resist, they told me the developer (sodium
>hydroxide) would damage it. Is this true ?  Is there an alternative
>process ?
>
>Richard Ibbotson
>Reading U.K.
>

I haven't heard of that but could give it a try with some small scraps of
Duroid I have. If you're really concerned, you can maybe print your
circuit on an oversized piece of board and trim the edges (Duroid cuts
easily with a knife or scissors). That way the edges which are exposed to
the NaOH can be trimmed off if contaminated. (I assume you're using
double-clad board?)

I have been using the DATAK photoresist/developer commonly available in
the USA. It is a negative-acting photoresist very similar to Kodak KPR.
The developer for it definitely does not harm Duroid 5870 or 5880.

Zack W9SZ

--



From [e-mail] Fri Nov 08 22:01:32 1996
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From: [e-mail] (Melissa & Jim)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
Subject: Re: some questions about PIN diode switches
Date: Thu, 07 Nov 1996 00:03:36 GMT
Organization: University of Wisconsin, System Administration
Lines: 23
Message-ID: <55r90p$[e-mail]>
References: <habi.847111559@bauv111> <[e-mail]>
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Brooke <[e-mail]> wrote:

>Claude Frantz wrote:

>Claude:

>There are two types of diodes: those that store charge (such as PIN,
>varactor, SRD,
>some schottkies that are made inproperly under large forward bias)
>and those that do not (such as schottky, tunnel).  For use at 150 MHz
>you need a diode that has a long lifetime (stores a lot of charge).

Isn't it just the other way around?  I thought large storage led to
long recovery times which led to low frequency.

Jim
   ---------------------------------------------------------------------
       Melissa Kepner                                    Jim Adney
       [e-mail]              [e-mail]
                             Laura Kepner-Adney
                             Madison, Wisconsin
   ---------------------------------------------------------------------



From [e-mail] Fri Nov 08 22:01:33 1996
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From: Madjid VE2GMI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Take a break, huh?
Date: Wed, 06 Nov 1996 21:53:20 -0500
Organization: ORION Microsystems
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <55q55m$[e-mail]>
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Mike Stansberry wrote:
>
> Jeff Bross ([e-mail]) wrote:
> : In article <[e-mail]>, Woody White
> : <[e-mail]> wrote:
>
> : > Could this possibly be posted to the WRONG homebrew group ;-)
> : > _Woody_
> : Possibly, but I don't really give a shit. Seems that you may be good at
> : WAISTING your time, so WASTE some time and fill out my damn survey.
>
> Go Away.

Those Winsconsin students really need an education !!!
What a terrible way to ask for collaboration.

Madjid, VE2GMI


From [e-mail] Fri Nov 08 22:01:34 1996
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From: Richard Ibbotson <"100116,113"@compuserve.com>
Newsgroups: rec.radio.amateur.homebrew
Subject: Help Identify Components
Date: Wed, 06 Nov 1996 21:42:32 -0800
Organization: CompuServe Incorporated
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Can anyone help identify some components bought at UK Hamfest ?

GaAs FET  NEC 32184A-1.0  I can't find these at the NEC site or the CEL
site on the web. Does anyone have a spec ?

RF Power Amp Module MX20-1  Nice black lump on copper heatsink, six pins.

I also got a "small" sheet of Rogers Duroid. When I told someone I wanted
to process using photo etch resist, they told me the developer (sodium
hydroxide) would damage it. Is this true ?  Is there an alternative
process ?

Richard Ibbotson
Reading U.K.


From [e-mail] Fri Nov 08 22:01:35 1996
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From: <>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2 meter/440 amp project
Date: 7 Nov 1996 06:29:21 GMT
Organization: Video On Line
Lines: 24
Message-ID: <55rvk1$[e-mail]>
NNTP-Posting-Host: tina24.vol.it

Earl Morse <[e-mail]> scrive: > Looking to do a club project.
A 2 meter or 440 amplifier (or both?)
> seems to be a popular choice.  Criteria are simplicity, frugality, and
> ease of construction and operation.  Anybody point me in the right
> direction for a cookbooked design for an FM amp in the 1-5 watt in/10-25
> watt out category.
>
> Earl N5TU
> [e-mail]


Hi Earl,

i suppose you need an rf-amp. I've made (at home) lot of them simply
using a rf-amp module (available,in several power,for Vhf, Uhf or Shf
as service parts).
Just now i'm working with a PF0310 (it's a fet rf-amp module, used in
Kenwood rtx; with 100mW in input, it gives 5W  in out @ 9.6Vcc!!!).
Believe me Earl, the modules can do miracles!!!

Good luck.

73 de IW8DCQ  William

Naples,ITALY  november 07 1996


From [e-mail] Fri Nov 08 22:01:36 1996
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From: [e-mail] (Steve Childress)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Thu, 07 Nov 96 07:15:11 GMT
Organization: Self
Lines: 12
Message-ID: <55s29c$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <55remb$[e-mail]> <[e-mail]>
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Damned lawyers  - Typical attitude. I doubt that his  livelihood depends on a
few crummy dollars a year from the wireheads (ARRL/SBE).  He'd be much better
off just ignoring a few comments in a newletter with a tiny circulation.

[e-mail]

------------------------------------------------------------
[e-mail]          If Computers Are The Answer...
  WB6CSZ                         What Was The Question?



From [e-mail] Fri Nov 08 22:01:37 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 7 Nov 1996 04:10:08 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 74
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In a message dated 96-11-06 11:20:03 EST, you write:

>We agree on this one, Tom.  I have never heard of a tune cap arcing in an
>AL-80.  Congrats to Denny Haad.

Denny did the AL80 that was run for less than 100 units and phased out.
The revamped 80, 80A, 80B were under my engineering supervision.

> However, I have heard about a number of
>bandswitch arcs in AL80s.  According to QST's  Paul Pagel, N1FB, Tom
Rauch
>received some telephone calls from Ameritron owners regarding this
problem
>shortly after "Parasitics Revisited" showed a photograph of a similar,
>parasitic-arced bandswitch (p.33 10/90 QST).  A ham in San Diego told me
>he went through two bandswitches in his AL80.  There should be no reason
>for bandswitch arcing.  The measured breakdown of the AL80's bandswitch
is
>Much higher than the anode supply voltage

True so far as HV, but another false conclusion so far as RF. The voltage
breakdown can be exceeded by RF. The RF voltage in a tank can soar to
several times the HV supply when the tank is underloaded. Surely you know
that.

It is impratical to design a tank that would withstand improper loading.
The normal design process involves selecting components rated at the
highest anticipated voltage under maximum line voltage, humidity,
pressure, and operating errors expected.

Traditionally the variable capacitor is selected as the limiting device,
although I sometimes (almost exclusively now) design in a spark gap from
the tube end of the tank to chassis. The bandswitch should ALWAYS have a
much higher voltage breakdown rating than the cap or gap, because any arc
in the switch will ruin it.

Unfortunatly the voltage breakdown of the air capacitors (hence my
inclusion of a gap) varies quite a bit with the alignment and finish of
the plates. The bandswitch also varies somewhat due to burrs and sharp
edges that occasionally appear.

The failure rate of the bandswitch in the AL80 series has declined almost
to zero. In my latest design refinement, the AL80B, switch failures occur
in approximately 2/10  % of total units sold. The next level higher switch
would add $140 to the cost of every PA, to benefit 2/10% of the users.
Customers would pay $120,000 a year to reduce the total yearly failure
cost of the entire customer base by perhaps $100-200. Once the less than
perfect switch is replace, the problem disappears anyway. Nichrome is not
needed, although it can help by LOWERING the operating Q of the tank on
the higher bands.

Even a real estate lady couldn't sell a bigger bandswitch deal like that.

Incidentally, one design I did for Heath (the SB1000) underwent two
changes that cause increased switch failures. One was they left off an
ANTI-corona washer on the 160 meter padding cap contact (the absolute
highest voltage part of the switch). The other is they omitted specs on
the transformer that would have limited the no-load voltage (secondary ESR
specs and the buck-boost primary).

The bandswitch failure rate in the SB-1000 was almost 8%, compared to
3/10% in the AL80A and 2/10% in the AL80B. The combination of pointed
connections by kit builders, no corona ring, and the looser transformer
voltage caused that large change!

By the way, the AL-80B wafer fit the entire SB series of PA's, and offer
improved voltage ratings when properly installed. They fit most Dentrons,
and GREATLY improve the voltage of those switches while reducing the
number of wafers and wires needed.

Please let me know if you find any disagreement with anything I've said,
so I can clarify it.

73 Tom


From [e-mail] Fri Nov 08 22:01:39 1996
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
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From: [e-mail] (Jeroen BELLEMAN)
Subject: Re: some questions about PIN diode switches
X-Nntp-Posting-Host: psas01.cern.ch
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Sender: [e-mail] (USENET News System)
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Xref: news1.epix.net rec.radio.amateur.misc:117753 rec.radio.amateur.homebrew:20880 sci.electronics.design:24962 sci.electronics.components:14072

In article <55r90p$[e-mail]>,
Melissa & Jim <[e-mail]> wrote:
>Brooke <[e-mail]> wrote:
>
>>There are two types of diodes: those that store charge (such as PIN,
>>varactor, SRD,
>>some schottkies that are made inproperly under large forward bias)
>>and those that do not (such as schottky, tunnel).  For use at 150 MHz
>>you need a diode that has a long lifetime (stores a lot of charge).
>
>Isn't it just the other way around?  I thought large storage led to
>long recovery times which led to low frequency.
>

This PIN diode is used as an RF switch, not a rectifier.  It's
forward biased to close the switch.  Now, even though the level of
RF voltage may be such that the diode is reverse biased for part of
the RF period, you don't want the diode to block.  Hence, the
storage time must be (much) greater than half an RF period.

Another key spec of PIN diodes used as RF switches is the junction
capacitance in the off-state, which should be suitably low.

Jeroen Belleman
[e-mail]


From [e-mail] Fri Nov 08 22:01:40 1996
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From: "Keith Stevenson" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Would like to build Vacuum Tube Receiver - Help!!
Date: 7 Nov 1996 14:02:10 GMT
Organization: British Telecommunications
Lines: 22
Message-ID: <01bbccb4$200ca5e0$[e-mail]>
NNTP-Posting-Host: alfonzo.bfsec.bt.co.uk
X-Newsreader: Microsoft Internet News 4.70.1155

Hi and thanks for reading this.

I have built several ic and transistorised projects in the passed and I
have a small collection of Heathkit, Trio and some other obscure valved
RX/TX and test equipment.  I would like to learn some more about the
insides of these magical radios that glow in the dark.

Can anyone suggest a simple circuit using readily available/manufacturable
parts?

I have access to PCB manufacture facilities, test equipment, quite a lot of
old (working) assorted valves and a lot of entheusiasm.  Oh yes and a 1957
ARRL Handbook  that I came across might come in handy too!!

I`ll look forward to any replies,

Thanks,

Keith Stevenson.
GI0SSA




From [e-mail] Fri Nov 08 22:01:41 1996
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From: "Bruce C. Raisley A.R.S. N9ZLE" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: SSTV, FAX, RTTY, CW and more
Date: Thu, 07 Nov 1996 09:31:40 -0500
Organization: SkyMaster products
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Check out the HamComm adapter, under $20 and does it all.

    http://www.cris.com/~n9zle/hc.html

Also it works with EZSSTV

                                Bruce mailto:[e-mail]


From [e-mail] Fri Nov 08 22:01:42 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newspump.sol.net!posts.execpc.com!usenet
From: Kent Winrich <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Thu, 07 Nov 1996 08:53:45 -0600
Organization: Exec-PC BBS Internet - Milwaukee, WI
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L. M. Rappaport wrote:
>
> [e-mail] (.) wrote (with possible editing):
>
> >In article <01bb739f.8e9f00c0$[e-mail]>,
> >   "James S. Kaplan" <[e-mail]> wrote:
> >>ARRL lawyer to sue member
> >>
> >>The following is a copy of a message I received today from
> >>ARRL General Counsel Christopher D. Imlay N3AKD:
> >>
> >>
> >>To:       James S. Kaplan, KG7FU
> >>Copies:   Mary Lou Brown, NM7N
> >>          Terry Baun
> >>          John Poray
> >>Date:     July 16, 1996
> >>Re:       Your article, SBE Chapter 124 Newsletter, July, 1996
> >>**************************************************************
> >>
> >>     Jim, I have just finished reading your article in the July,
> >>1996 Water Cooled Newsletter, page 6. In it, you argue that two of
> >>my clients, the American Radio Relay League, Inc. and the Society
> >>of Broadcast Engineers, Inc. should cooperate in certain government
> >>relations projects, specifically spectrum protection. You note that
> >>I serve as the General Counsel for both organizations. You then
> >>jump from that argument to the following, which I quote:
> >>
> >>     If Mr. Imlay can't resolve HIS OWN conflicts of interest,
> >>     perhaps both ARRL and SBE should be seeking more
> >>     effective counsel. No offense Chris, but we have work to
> >>     do. We should not only be sending a message to the FCC
> >>     and Congress, but to other radio industries.
> >>
> >>                              (emphasis in original)
> >>
> >>It is not useful for me to educate you on the subject of your
> >>article to correct the errors in it, and I do not intend to do so.
> >>What I do intend, however, is for you to print a retraction, in
> >>unambiguous terms, in a form acceptable to me, and to furnish to
> >>me, in writing, an assurance that such will be printed in the next
> >>Chapter Newsletter for Chapter 124. Failing that, I am going to sue
> >>you in the District of Columbia for libel.
> >>
> >>     I have no intention of allowing you to falsely allege that I
> >>have a conflict of interest in representing two of my best clients,
> >>especially in an SBE publication. You are not entitled to damage my
> >>reputation as a lawyer, which you have done in your article, or to
> >>infer (without any basis at all) that I have violated the canons of
> >>ethics governing attorneys, by which I govern my actions.
> >>
> >>     I will await your response.
> >>
> >>Chris Imlay, N3AKD
> >>
> >Great response! People need to express their thoughts and opinions without
the threat
> >of legal action!
> >
> >Dave
> >[e-mail]


I noticed that Chris did not include his email so we could write to him
with a few opinions!

Kent, NI9U


From [e-mail] Fri Nov 08 22:01:43 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: 7 Nov 1996 14:55:29 GMT
Lines: 22
Message-ID: <55st91$31ie$[e-mail]>
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In <[e-mail]>, [e-mail] (L. M. Rappaport) writes:
>
>Imagine that - a lawyer concerned about his reputation!  As if they
>had any.  Give him a break, Imlay - get a life.
>
>L. M. Rappaport
>

Alas, it is arrogance of that sort that gives the profession a bad name among
the public.  Pretty unfortunate.

Roger J. Buffington
W6VZV
[e-mail]

USC Law School, Class of '97

--------------------------------------------------
"I want to die peacefully, in my sleep, like my Grandfather."
"Not screaming, and in terror, like his passengers."
--------------------------------------------------



From [e-mail] Fri Nov 08 22:01:44 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 07 Nov 1996 07:58:01 -0700
Organization: Internet Access of Ventura County
Lines: 54
Message-ID: <[e-mail]>
References: <[e-mail]> <55s91g$[e-mail]>
NNTP-Posting-Host: port18.vcnet.com

In article <55s91g$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In a message dated 96-11-06 11:20:03 EST, you write:
>
> >We agree on this one, Tom.  I have never heard of a tune cap arcing in an
> >AL-80.  Congrats to Denny Haad.
>
> Denny did the AL80 that was run for less than 100 units and phased out.
> The revamped 80, 80A, 80B were under my engineering supervision.

Was the tune capacitor changed substantively between the 80 and the 80A/B?

> > However, I have heard about a number of
> >bandswitch arcs in AL80s.  According to QST's  Paul Pagel, N1FB, Tom
> Rauch
> >received some telephone calls from Ameritron owners regarding this
> problem
> >shortly after "Parasitics Revisited" showed a photograph of a similar,
> >parasitic-arced bandswitch (p.33 10/90 QST).  A ham in San Diego told me
> >he went through two bandswitches in his AL80.  There should be no reason
> >for bandswitch arcing.  The measured breakdown of the AL80... bandswitch
> is
> >Much higher than the anode supply voltage
>
> True so far as HV, but another false conclusion so far as RF. The voltage
> breakdown can be exceeded by RF. The RF voltage in a tank can soar to
> several times the HV supply when the tank is underloaded. Surely you know
> that.  ...snip...

No.
 However, I do know that in a 3-500Z g-g amplifier that uses a 3000V anode
supply, the negative-going change in anode voltage during the  conduction
cycle of the 3-500Z is about 2700vp (volts peak), which coincides with the
peak in anode current.  At this peak, the anode to (grounded)grid voltage
is about 300v.  {3000v minus 300v = 2700v}  When the amplifier is
underloaded, the tube saturates, and the anode to grid voltage (at the
anode current peak) is about 150v.  In other words, the negative-going
change in anode voltage is about 2850vp.  It's a long way from 2850vp to
the 5500v or more needed to arc the bandswitch.

 Therein lies the heart of the problem.  Manufacturers of amplifiers tend
to assume they understand everything about amplifier theory, and that all
of their customers are drooling idiots.
 I get phone calls from people who experienced mysterious bandswitch
arcing problems in amplifiers that were tuned up correctly. Kenwood, whose
922 bandswtich arcing problems are Much more common than is the case in
the AL80..., used to tell customers that bandswitch arcing was caused by
rapidly switching the bandswitch while transmitting.   Yeah, right.
-----------------------------
e-mail copy to Mr. Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:01:45 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!feed1.news.erols.com!howland.erols.net!netcom.com!n1ist
From: [e-mail] (Michael L. Ardai)
Subject: Re: ARRL lawyer to sue member
Message-ID: <[e-mail]>
Organization: Utopia Planetia Shipyards - Mars
References: <55remb$[e-mail]> <[e-mail]> <[e-mail]>
Date: Thu, 7 Nov 1996 15:02:11 GMT
Lines: 19
Sender: [e-mail]
Xref: news1.epix.net rec.radio.amateur.antenna:31242 rec.radio.amateur.digital.misc:19995 rec.radio.amateur.dx:1244 rec.radio.amateur.equipment:41958 rec.radio.amateur.homebrew:20891 rec.radio.amateur.misc:117773 rec.radio.amateur.policy:42860 rec.radio.amateur.space:8757

In article <[e-mail]> Kent Winrich <[e-mail]> writes:
[Revival of this old blather...]

-I noticed that Chris did not include his email so we could write to him
-with a few opinions!

I don't know why someone just brought this thread back; it made the rounds
back in the summer (and I thought got bashed to death...)

Try calling the League; I'm sure they have Chris's address.  It might be
[e-mail], but I haven't tried that one.
/mike



--
\|/      Michael L. Ardai        N1IST       [e-mail]       \|/
-*- ===  Boston Amateur Radio Club:  http://www.barc.org/barc   === -*-
/|\    or send "info barc-list" to [e-mail]     /|\


From [e-mail] Fri Nov 08 22:01:46 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need 4cx250x amplifier schematics
Date: 7 Nov 1996 17:38:34 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 9
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com



     I need schematics for amplifiers using the 4cx250 tubes, any number
of tubes...    Any help would be greatly appreciated

Thanks in advance.

Rob



From [e-mail] Fri Nov 08 22:01:47 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet
From: Jim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 4cx250x amplifier schematics
Date: 7 Nov 1996 20:33:39 GMT
Organization: IdeaSource
Lines: 12
Message-ID: <55th33$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 222.229.249.54
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The older Bill Orr handbooks featured a number of these.
One design featured a 4CX250 driving a much larger final...
took a 0.7-watt input on the 4CX250.

Also, there was an intriguing article in Ham Radio magazine
on a non-forced-air cooled 4CX250 "QRP" amp, but I don't have the
reference for this article.  You could use that schematic
with forced-air cooling and a higher Ep for a bigger bang.

N6OTQ




From [e-mail] Fri Nov 08 22:01:48 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!ott.istar!istar.net!tor.istar!east.istar!virginia.bmts.com!primeline.net!tait
From: Gary Tait <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bi-polar Proms
Date: Thu, 7 Nov 1996 16:14:16 -0500
Organization: Bruce Municipal Telephone System
Lines: 24
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ns.primeline.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: Alex Szopko <[e-mail]>
In-Reply-To: <[e-mail]>

On 5 Nov 1996, Alex Szopko wrote:

#Hi everybody!
#
#I have a problem again.What is the difference between an E-PROM and a
#
#BI-POLAR PROM ? Can you program a BI-POLAR PROM on an E-PROM programer,
#
#as far as I know E-PROM is erasable and the BI-POLAR PROM is not.
#
#Is that the only difference?
#
#Please help
#
#                        73's Alex VK7CS

There are two types of prom, one is esentially an EPROM without the
window,and the other actually has fusible elements. The former
can be programmed as an EPROM, the latter needs more current to open
the fusible elements.

Gary Tait , VE3VBF
- Please do not quote US prices, they are no good to me ,here in Canada -



From [e-mail] Fri Nov 08 22:01:49 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!vixen.cso.uiuc.edu!news.stealth.net!solace!news.ifm.liu.se!news.lejonet.se!usenet
From: @hagagymnasiet.norrkoping.se
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Folded Dipole
Date: Thu, 07 Nov 1996 13:23:06 -0800
Organization: Foreningen Lejonet, Linkoping, Sweden
Lines: 9
Message-ID: <[e-mail]>
References: <55osve$[e-mail]>
NNTP-Posting-Host: 194.68.149.12
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; I)
To: Thom <[e-mail]>

>   I was wondering if it is possible to use 400 ohm ladder line for a
> folded dipole...not as the feedline but rather as the dipole itself.
> It would seem that by shorting the ends and feeding it in the center that it
 would be quite easy...what am I missing?

It will work fine, provided the ladder line will stand the stress when
you tighten it between the end points. I would try to relieve that stress
by using a center support, however.

73 de Lennart SM5DFF


From [e-mail] Fri Nov 08 22:01:50 1996
From: [e-mail] (David Covert)
Subject: Re: Wanted: MC145170 designs
Date: 7 Nov 96 15:34:03 -0800
References: <[e-mail]> <[e-mail]>
Message-ID: <[e-mail]>
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!news.magicnet.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.msn.com!msn.com
Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (msn.com)
Lines: 3

Who makes the YAPLL-x modules? Or are they a project from the mag?

dave kb5gog


From [e-mail] Fri Nov 08 22:01:51 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!in3.uu.net!server-b.cs.interbusiness.it!slip3.etrurianet.it!user
From: [e-mail] (Riccardo Gaggioli)
Newsgroups: rec.radio.amateur.homebrew
Subject: transverter
Date: Fri, 08 Nov 1996 01:02:21 +0100
Organization: Centro Servizi Interbusiness
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip3.etrurianet.it

Hello,I need transverters(RX & TX) from 28 MHz to 144,432,1296 and upper
frequencies;I am interested in KITs and ready devices:someone can help me?
Thank you,
IK5WQO Riccardo


From [e-mail] Fri Nov 08 22:01:52 1996
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From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics
Subject: Re: NBFM modulator: design wanted
Date: 8 Nov 1996 02:21:36 GMT
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In <55mr2q$[e-mail]>, [e-mail] (Maroof H. Choudh
ury) writes:
>Can anybody suggest a simple design of a narow band frequency
>modulator for Citizen's band?

I see that you have gotten numerous responses regarding varactors, etc.

However, I did not see anyone point out that FM is not legal on CB
(At least in the US, unless the rules have changed dramatically)

I'm curious ... Why do you want to build an FM modulator for CB???

Carl - wa6vse
[e-mail]




From [e-mail] Fri Nov 08 22:01:53 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 8 Nov 1996 03:37:35 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
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Hi Rich,

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:
>
>Tom:  You still do not seem to understand that the engineer said that the
>excessive grid current was apparently the result of an oscillation far
>above the operating frequency.

Rich, first of all the Foote letter plainly says no such thing. It states
your letter about parasitics was interesting, and the inside of the tube
was badly overheated. The fellow assigned to answer customer letters said
it was the result of an "apparent oscillation", but never said what kind,
or even that it WAS an oscillation.

If I sent in some overheated tubes, with a letter saying I thought my PA
oscillated, they would most likely write back, "your tubes are cooked,
apparently the result of oscillation". If I wrote a letter saying my tubes
were overdriven, they would very likely reply "your tubes were apparently
overdriven".

Fiind a tire with a broken belt, and take it to the tire store and tell
them you think it was damaged hitting a curb, and they'll say "yep, you
apparently hit a curb".

This letter should be a long dead issue. Eimac has told you directly, and
indirectly through QST, if anyone implied parasitics were the cause of
grid damage they were mistaken. Their view is on page 71 of the September
1994 QST, and again page 74. Eimac's official response directly disputes
your claims about the grid.

>> Are you still maintaining that it takes 500 watts to damage a grid
>> Eimac rates at only a few watts? ....snip........

>Tom:  I was talking about the 8877 grid.  The rated grid dissipation is
>25w.  Since there is no numerical definition of 'few', I suppose 25 will
>do.  The answer is yes.

Let's apply some common sense.

The grid has much less thermal mass than the cathode. The more massive
cathode is heated to 750+ C with 50 watts. But the smaller thermal mass
grid, rated at 25 watts by the manufacturer, with gold that becomes
completely liquid at 1063 C, isn't damaged until 500 watts dissipation is
reached.

I'd like to find some merit in something you say, but every aspect of your
postulations runs contrary to common sense and known facts (if you have a
copy of Reference Data for Radio Engineers or Electronic Designers
Handbook you can look the facts up). Can you explain your theory better?

73 Tom


From [e-mail] Fri Nov 08 22:01:54 1996
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From: altavoz <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.electronics.equipment
Subject: Re: BIRD 43 Help/Tutorial
Date: Thu, 07 Nov 1996 21:16:41 -0800
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Bob Smith wrote:
>
> Can someone kindly point me to a tutorial on the Bird 43 watt meter.  Just
> got one used without a manual.  They look very simple to use.
>
> I do have a RF Sampler fitted - what range out output does this have? -
> would hate to blow my frequency meter or o-scope.!
>
> Thanks a million for reading.
>
> --
> >>>>
> Bob Smith    N3FTU
> Atlanta, GA


altavoz: Many slugs and $$$thousands of dollars later ......
WHY NOT BUY AN MFJ249/209 ?

______End of text  from altavoz___________


From [e-mail] Fri Nov 08 22:01:55 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 8 Nov 1996 05:44:42 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
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In article <55p410$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>I guess my point, apparently not well made, was that the reactance
>appearing at the anode was high at VHF not because of the physical
>capacitor itself.  Rather, the topology of the amplifier usually
>involves significant series reactance in the connections to and from
>the capacitor.  The net effect would be to place a fairly high
>impedance at the anode at VHF.

Hi Fred,

I replied once, but had some more thoughts on this. First let me clarify
one thing. My point in measuring the tuning capacitor was to find out if
it is possible to drive it with VHF energy and make it arc, and the answer
seem to be a firm "no". The impedance is too low, at least between 60-80
MHz and 1 gHz.

You mentioned the anode. If the problem was high impedance in this area of
the circuit, removing a wide low resitivity conductor and replacing it
with a thin more resistive conductor would do no good at all. This is
simple to analyze.

At VHF and higher, longer leads become more of a transmission line problem
than simple "inductance" problems. To keep the anode impedance low, a low
surge impedance is required in the line leaving the anode. That is
achieved with a thick conductor, because the problem is one of maintaining
the lowest possible ratio of distributed capacitance to inductance in the
lead.

On the other hand, any increase in distributed resistance of the lead will
increase the load impedance at the anode, which increases swing voltage
available due to the time varying resistance of the anode. Adding thinner
nichrome wire in the VHF path would absolutely increase the resistance and
reactance (impedance) presented to the anode, and aggrivate feedback at
VHF.

It would however, de-Q the circuit at HF and reduce the peak anode voltage
available at the operating frequency if the tank was mistuned. That's
because at lower frequencies the lead length is short, and the major
effect problem is simply resistance in the path of the shunt anode
capaciatnce to the resonant tank.

Generally, the goal in a RF PA is to keep all path impedances as low as
possible, and place a load at the proper point. That point should load the
tube optimally at the frequency where the combination of internal
structure and external leads forms a resonant circuit, because that is the
frequency where the parasitic occurs.

Rich suggests using thin nichrome in the leads and in the inductance of
the suppressor, we looked at the leads above and see that is a bad idea,
let's look at the suppressor itself. The goal of the suppressor is to
place a resistance in the VHF path between the anode and chassis. The
anode lead, blocking capaciator, and plate tuning capacitor, and sheet
metal form that path. We certainly all know the BOTH capacitors (tune and
load) should be mounted to the same sheet metal, and that sheet metal
should have a short low impedance path to the grid and input circuit.

To put the resistance in that path, we need the shunt reactance to be as
high as possible across the resistance at VHF. To maintain tank Q, we want
the shunt reactance across the resistance to be as low as possible. Since
the primary VHF path is through the resistance (in a well designed
suppressor) the Q of the suppressor coil is almost meaningless. It is the
impedance of the coil, and the amount of resistance, that controls VHF and
higher Q.

With nichrome, we have designed a low Q HF suppressor, with less anode
loading at VHF. That would explain the improvement because it reduces HF
voltage, a voltage we know CAN cause the bandswitch or tuning capacitor to
arc. Lowering HF Q will make the tank soother to tune also!

The only question I have is if this change is the best way to solve
problems of underloaded tanks. Remember the Q goes all over the place with
the setting of the loading capacitor and the mean value of time varying
shunt resistance presented by the tube. The series nichrome reduces tank Q
more at low Q loading settings. We want to reduce it more at hi-Q loading
settings. It sure seems a better solution would be to wind the plate choke
with nichrome, placing the resistance in parallel with the anode. Q
reduction would be more at high anode tank operating impedances (where we
really want lower Q), rather than low ones (where we are supposed to be
operating the tank).

Placing nichrome in that path, if workable, would also reduce intensity of
gas arcs, a "free" additional benefit.




From [e-mail] Fri Nov 08 22:01:57 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 8 Nov 1996 05:45:01 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
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Hi Rich,
In a message dated 96-11-07 12:03:17 EST, you write:

>> Denny did the AL80 that was run for less than 100 units and phased out.
>> The revamped 80, 80A, 80B were under my engineering supervision.
>
>Was the tune capacitor changed substantively between the 80 and the
80A/B?

NO.

And then I wrote the RF tank voltage can exceed the dc supply voltage by
several times when the PA is unloaded. I said:
>> breakdown can be exceeded by RF. The RF voltage in a tank can soar to
>> several times the HV supply when the tank is underloaded. Surely you
know
>> that.  ...snip...
And Rich says:

>NO
> However, I do know that in a 3-500Z g-g amplifier that uses a 3000V
anode
>supply, the negative-going change in anode voltage during the  conduction
>cycle of the 3-500Z is about 2700vp (volts peak), which coincides with
the
>peak in anode current.  At this peak, the anode to (grounded)grid voltage
>is about 300v.  {3000v minus 300v = 2700v}  When the amplifier is
>underloaded, the tube saturates, and the anode to grid voltage (at the
>anode current peak) is about 150v.  In other words, the negative-going
>change in anode voltage is about 2850vp.  It's a long way from 2850vp to
>the 5500v or more needed to arc the bandswitch.

Your analysis is seriously flawed Rich, as it was with the skin effect and
gold, the photons, and the mechanisms surround oscillation. Let me explian
why. If you have spice you can model the PA, or with a small FET you can
breadboad it. S59A measured his SB-220 and got the same values I did
measuring one here, but let me use your example.

You overlooked a VERY simple fact. When the anode is pulled low (into
current saturation) nothing prevents the *anode* from moving lower than
the chassis or catode. If the tank, or any other external inluence would
ever try to drive the anode low, it is very easy to do (at that moment in
time). The tube is a time varying resistance, not a source. BUT IT IS A
RESISTANCE IN SERIES WITH AN INTERNAL DIODE. If the flywheel action of the
high Q tank tries to force the tank lower than zero (or even lower than
the Rp/RL divider determines), nothing stops it. Away it goes.

When the anode is negative, the tube stays cut off no matter how hard the
grid cathode path is turned on. It is impossible to "turn on" the anode
path when the tube has this momentary negative anode to cathode voltage.

The tank overshoot holds the anode negative, and the grid starts moving
the other way (towards the direction of cut-off). When the tank starts
allowing the anode to move positive, it is not loaded by the time varying
anode resistance. Tube resistance, at that moment of time, is higher than
the value required to match the tank (at any given moment of time the
dynamic resistance of the anode has to match the E/I of the tank for
maximum energy transfer. The tube loads or pulls on the tank with it's
resistance, it does NOT source voltage or current).

When the tank voltage reaches it's peak, the tube is cut-off by the grid
cathode bias. The tube anode will overshoot (now the grid holds the plate
resistance off) and the HV at the anode will greatly exceed the supply
voltage.

The tank circuit voltage can exceed the supply by a very large amount if
the tank Q is high and the tank is underloaded.

> Therein lies the heart of the problem.  Manufacturers of amplifiers tend
>to assume they understand everything about amplifier theory, and that all
>of their customers are drooling idiots.

Sooner or later, I knew this would turn into a manufacturers condemnation.

I suspect most manufacturers don't think customers are "drooling idiots",
but they probably thing people that pretend to be knowledgeable and give
customers bad advice are, hi.

If I can prove my statement, that the peak tank voltage can exceed the
supply voltage by significant amounts is correct, will you appologize for
your accusation of manufacturers thinking customers are idiots? Will you
admit your basic knowledge of PA operation is flawed?




From [e-mail] Fri Nov 08 22:01:57 1996
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From: [e-mail] (bill)
Newsgroups: rec.radio.amateur.homebrew
Subject: TEMCO 100A need parts
Date: 8 Nov 1996 06:28:15 GMT
Organization: Your Organization
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i've got a 1938 temco 100a transmitter that needs a plate transformer for the
final.
the original transformer was replaced with one that only gives me 650- 700
volts to the plate.i need 1250 to 1500 using a center tapped full wave supply.
anyone know were i can find original parts? or where to look for suitable new
parts?
also where can you get crystals for the ham bands? (160-10).
i also could use output coils for this unit. i've got a  coil but it was used
on 2.1mhz or 2.7mhz. but would like to get a full set. the coil i have is a
plug in with a variable link coil inside the two output coils.
i have the complete engineering data for this unit and would be happy to share

it with anyone who wants it.
the transmitter was used as a mobile unit for WSYR 570 AM Syracuse N.Y.from
1939 to ? w2bji was the guy who ran it.
well any info on parts or old stuff would be ice. THANKS !
ka9rle bill in madison wi.



From [e-mail] Fri Nov 08 22:01:58 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 08 Nov 1996 08:10:38 -0700
Organization: Internet Access of Ventura County
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References: <[e-mail]> <[e-mail]>
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In article <[e-mail]>,
[e-mail] wrote:

snip...
> Eimac has clearly told you it is a mistake to assume the problem is
> parasitics. This is repeated in an extract from a official letter that
> appeared in QST......snip........

The anonymous letter you posted on this newsgroup means zero without the
author's name.

To the best of my knowledge, there was no part of an 'official letter'
from Eimac that appeared in QST.

You have not identified who the 'entire staff' is at Eimac.

You have not explained why it is better for a vhf suppressor to use a high
vhf Q inductor.
-------------------------------
e-mail copy to Mr. C. Tom Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Fri Nov 08 22:01:59 1996
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From: [e-mail] (Jason)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Fri, 08 Nov 96 15:21:33 GMT
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In article <[e-mail]>, Kent Winrich <[e-mail]> wrote:
>Path:
> sol.caps.maine.edu!cam-news-feed2.bbnplanet.com!news.bbnplanet.com!cam-news-
hu
>b1.bbnplanet.com!howland.erols.net!newspump.sol.net!posts.execpc.com!usenet
>From: Kent Winrich <[e-mail]>
>Newsgroups:
> rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.d
x,
>rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
,r
>ec.radio.amateur.policy,rec.radio.amateur.space
>Subject: Re: ARRL lawyer to sue member


[ BIG snip]..


yep... we really need to see this here in rec.radio.space..... geezz.

Jason     N1RWY


From [e-mail] Fri Nov 08 22:02:00 1996
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From: [e-mail] (H. Caron)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help on transistor id
Date: Fri, 08 Nov 1996 15:43:54 GMT
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Hi

Can someone confirm the identification this transistor.
The side inscription reads as;  T. K59  GR  9D

Checking T.K59 or K59 or GR9D independently in my NTE cross-reference
hbk didn't yield anything ( I think K59 is the real identifier for
3SK59 which is equivalent of ECG/NTE222 MOSFET, which is actualy what
I need)

The unit I have as the exact same physical appearance as the 222,
metal casing with the tab and the 4 legs.

If you conclude that what I have in hand is actualy a 3SK59, can you
confirm it is leg for leg equivalent with the 222?

Finaly, is there a simple test I can make with a DVM (as for bipolar
transistors) to check it, that it is nor short or open.

Many thanks for your help,

H. Caron



From [e-mail] Fri Nov 08 22:02:01 1996
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From: [e-mail] (Jacobson)
Newsgroups: rec.radio.amateur.homebrew
Subject: WT GPS info
Date: Fri, 08 Nov 1996 10:07:05 -0600
Organization: University of Minnesota
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I'm interested in building a better antenna for GPS, and can't find info
on what frequency and polarization is used by this system. Any info or
pointers to it would be welcome.  Please send as email as well, my news
provider doesn't hold messages long, and I don't want to miss your answer.

TNX
de KA0ZIL
Steve Jacobson
[e-mail]


From [e-mail] Fri Nov 08 22:02:03 1996
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From: [e-mail] (Terry Simonds)
Newsgroups: rec.radio.amateur.homebrew
Subject: BC-375 TUNING-UNIT CAPACITORS: A GOLDMINE
Date: Fri, 08 Nov 1996 16:41:09 GMT
Organization: Icanect
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       BC-375 TRANSMITTER TUNING UNIT CAPACITORS

The following information, gleaned from some obsolete US Army Tech
Manual, lists the capacitor ranges of various variable capacitors
found in the Tuning Units of the BC-375-E Transmitter. The part no.
can be found stamped on the end plate of the "condenser." The
condensers are listed according to the number of the tuning unit in
which they are found. Capacitance is in uuF.

--------------------------------------------
 TU-         Part No.         Max       Min
--------------------------------------------
 5A       P-7761569P2          35       20
 5A       T-7660443P6         156       20
 6A       P-7761569P3          77       15
 6A       T-7660443P1         116       19
 7A       P-7761569P4         111       23
 7A       T-7660443P2         116       19
 8A       P-7761569P5          66       14
 8A       T-7660443P7          81       15
 9A       P-7761569P6          77       15
 9A       T-7660443P3         116       19
10A       P-7761569P7          62       14
10A       T-7660443P4         116       19
--------------------------------------------

In addition, each tuning unit contains two identical neutralizing
capacitors; the range of these is 26-19 uuF.

These capacitors are of the highest quality, being ceramic and
silver plated. Even though designed for use in WW2, the BC-375
tuning units contain a wealth of "good stuffe!" National Velvet
vernier drive, standoffs, caps, thick alum panel, drawn alum case,
etc., etc.

The moral: Never throw anything away!

73--Terry/WB4FXD


Terry Simonds in Ft. Lauderdale
Researching SIMONDS/CAREY/DINSMORE/MANN



From [e-mail] Fri Nov 08 22:02:04 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 08 Nov 1996 17:47:49 GMT
Organization: INTERNET AMERICA
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On 8 Nov 1996 05:44:42 GMT, [e-mail] wrote:
> It sure seems a better solution would be to wind the plate choke
>with nichrome
>Placing nichrome in that path, if workable, would also reduce intensity of
>gas arcs, a "free" additional benefit.

I alwys understood that nichrome wire was the "secret" of the B&W 800
plate choke.  Wasn't it wound with nichrome?


Fred
[e-mail]
[e-mail]


From [e-mail] Fri Nov 08 22:02:05 1996
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From: [e-mail] (Grady Russell)
Newsgroups: rec.radio.amateur.homebrew
Subject: How to reduce power?
Date: Fri, 08 Nov 1996 12:35:50 -0600
Organization: Canadians for Global Warming
Lines: 9
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Perhaps one of you homebrewers can assist me...how can I reduce the power
of my radio? Is there something I can place between my mobile and coax?
I'd like something that wouldn't modify the radio and could easily be
turned on and off to avoid overloading an amp. Can anyone assist with
this?

TIA,
Grady


From [e-mail] Fri Nov 08 22:02:06 1996
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Diplexers
Date: 8 Nov 1996 21:52:00 GMT
Organization: Hewlett-Packard
Lines: 14
Message-ID: <560a20$[e-mail]>
References: <01bbcd49$574d21c0$1318a6c2@mazzola>
NNTP-Posting-Host: mentor23.scd.hp.com

In article <01bbcd49$574d21c0$1318a6c2@mazzola>,
Giovanni Mazzola <[e-mail]> wrote:
>I'm trying to design a diplexer to be connected between the mixer (SBL-1)
>
>Any help about diplexers ? Please do not confuse it with a "duplexer", a
>Giovanni, IT9XXS
>[e-mail]


Look up Wenzel's 1968 paper in the IEEE Trans. on Microwave
Theory and Techniques.

Rick N6RK



From [e-mail] Sat Nov 16 17:20:57 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: "New" Old Computers Magazine
Date: 12 Nov 1996 05:15:11 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 55
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com

Doesn't anyone care about old computers?!
Find out in the new magazine of computer history nostalgia -
"Classic Computing" magazine

Historical Computer Society
3649 Herschel Street
Jacksonville, FL 32205
Contact: David Greelish, President and Founder
E-mail: [e-mail]
On the World Wide Web - http://www.cyberstreet.com/hcs/hcs.htm (under
construction)

JACKSONVILLE, FL, November 10, 1996   Some people collect stamps, baseball
cards, dolls and even cars. But did you know that there is a group for
people who collect computers! This group even has some members with over
fifty computers in their own private collections! The Historical Computer
Society is an international user group for old computer enthusiasts ( old
computers  and/or  old enthusiasts ). HCS has over thirty classic
computers in it s own collection; important older machines which most
people have never seen before, much less heard of, like the IMSAI,
Osborne, PET and more. The Society is dedicated to preserving older and
classic computer hardware, software and literature while educating and
helping it s members as well as the general public. Their new quarterly
magazine,  Classic Computing  is all about personal computer history as
well as computer history in general! In only twenty short years, there is
much history to be shared just about personal computers. The Society and
it s magazine were started in the pioneering spirit of the early computer
clubs (like the Homebrew Computer Club). Even with today s impressive
technological breakthroughs in computing, that fresh, exciting, pioneering
spirit doesn t seem to be a part of it all anymore. HCS hopes to rekindle
some of that excitement and to share it.

Many people have fond memories of their early computing days. Never has
another device evolved so rapidly as to produce nostalgic artifacts in
less than a quarter of a century!  Classic Computing  is a forum for these
people to meet and share their stories.

The Historical Computer Society intends to become the authority in the
community of retired personal computers. Hundreds of old computers are
thrown out everyday by Americans as junk, but HCS believes that these
outmoded machines have value. HCS can help owners find answers about
system operation, peripherals, software, books, magazines and service.

 Classic Computing  is the central forum for members and is ready to
become the premier circular for information, classifieds and trading of
outdated equipment, etc. New subscriptions in the U.S. are only $14 a year
or try an issue for only $3; subscriptions in Canada are $16 and $24
international.  Classic Computing  is sold at The Computer Museum in
Boston, the American Computer Museum in Bozeman, Montana and at
Smithsonian Book Stores, Washington, DC.

HCS is beginning a local meeting chapter in Jacksonville, Florida! Meet
once a month with others who share in the passion. If you live in
North/Central Florida or Southern Georgia and would like to attend, please
write David Greelish by e-mail for more information of the first meeting.


From [e-mail] Sat Nov 16 17:20:57 1996
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From: [e-mail] (Jeff Groberman)
Newsgroups: rec.radio.amateur.homebrew
Subject: 12v antenna rotator
Date: Mon, 11 Nov 1996 18:42:07 GMT
Organization: Canada Internet Direct, Inc.
Lines: 4
Message-ID: <567s46$[e-mail]>
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I want to use an antenna rotator at our cottage.  We only have 12V DC.
Does anyone have a plan for, know of, want to sell a 12 volt antenna
rotator?



From [e-mail] Sat Nov 16 17:20:58 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dispatch.news.demon.net!demon!btnet!knews.uk0.vbc.net!theplanet.net!news
From: Simon Robinson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2 Mtr SSB Kit(s)?
Date: Mon, 11 Nov 1996 10:09:51 -0800
Organization: Soft Tools UK
Lines: 17
Message-ID: <[e-mail]>
References: <5684pi$[e-mail]>
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Peter Hertler wrote:
>
> Does any one know of a 2 mtr SSB xcvr kit or plans to build?
>
> Thanks
>
> Peter Hertler VE3KAI
> [e-mail] was an article in the RSGB magazine RADCOM for a por
table 2m SSB
transceiver which uses the now obsolete Plessey SL1600 series chips.

If you cannot find anything more suitable, e-mail me and I will see if I
can help further.

Regards


Simon


From [e-mail] Sat Nov 16 17:20:59 1996
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From: Duncan Clark <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 3-500Z's - whats the difference?
Date: Fri, 15 Nov 1996 15:19:34 +0000
Organization: DNAmp Ltd.
Lines: 22
Distribution: world
Message-ID: <[e-mail]>
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Hi Folks,

There are a number of different 3-500's on the market from genuine Eimac
to 'pretenders'. These 'pretenders' are less expensive so what is the
catch? Worse perfomance, prone to failure, won't work on 6m or can they
used without problems. I am asking on the basis that in the UK we can
only run 400W PEP output so they don't get run to the hilt. A single 3-
500 run conservatively is more than enough for our licence regs. Given
that we tend to pay in pounds what the US pays in dollars ie 1:1
exchange rate (not 1.6:1!), can we safely use non-Eimac 3-500's.

Duncan
G4ELJ
------------------------------------------------------------------------------
--
The problem with being on the cutting edge is that you occasionally get
sliced from time to time....

Dr. Duncan Clark
DNAmp Ltd.
TEl/FAX [phone]
http://www.prestel.co.uk/dnamp
http://www.genesys.demon.co.uk


From [e-mail] Sat Nov 16 17:21:00 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3-500Z's - whats the difference?
Date: 16 Nov 1996 05:26:39 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 22
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Newsreader: AOL Offline Reader

Hi Duncan,
In article <[e-mail]>, Duncan Clark <[e-mail]>
writes:

>There are a number of different 3-500's on the market from genuine Eimac
>to 'pretenders'. These 'pretenders' are less expensive so what is the
>catch?

If you ran low HV and dissipation, I think you could get away with the
Chinese 3-500Z's. If not, be careful.

You can have problems with any brand, even Eimac went through periods of
internal gas and weld problems, but all in all the tubes made by Amprex
and Varian are many times better than Chinese 3-500Zs.

The Chinese tubes have poor fitting components (like anode connectors),
gas troubles, and weak envelopes. Emission drops rapidly, and the anodes
won't stand 500 watts of dissipation for long. Even if the anode does, the
glass fails. I still look at samples on occasion, and they are improving..
but they still have a distance to go.

73 Tom


From [e-mail] Sat Nov 16 17:21:01 1996
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From: Bob Miller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: re:4cx250 glows blue-ish. ...
Date: Fri, 15 Nov 1996 09:14:37 -0800
Organization: CalWeb Internet Services, Inc.
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Blue glow would appear to be a normal trait of this family of tubes.  A
buddy of mine, KD6QFZ, built a dynamic tube tester for this family of
tubes and noted that after testing dozens of 4CX250, 4X150, 4CX350s and
their 24 volt fil equivs. that all had a purple glow visable through the
ceramic material.  The glow varied in intensity with plate current flow
and was quite bright at full rated plate current.  No other abnormal
conditions were noted and the tubes performed to specification in RF
applications both HF and VHF.  I sure would not toss the tubes based on
a little inonized gas!

        Bob, KE6F


From [e-mail] Sat Nov 16 17:21:02 1996
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From: Peter Dingemans <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 4cx250 glows blue-ish: what's wrong?
Date: Mon, 11 Nov 1996 15:15:49 -0800
Organization: Erasmus Universiteit Rotterdam
Lines: 24
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G'day everyone,

A couple of weeks ago I built an amplifier, using a (surplus) 4cx250. The
problem is: it doesn't work (much). Guess the coils/cap's aren't in the
band yet.

That's not the main problem, though. When I turn on the amp, you can see
a blueish glow inside of the tube. It can only be noticed when it's dark,
and is hard to see because of the ceramic envelope, but is definitely
there. When I increase anode-current, the glow gets brighter.

I vaguely remember reading something about this a long time ago; in that
article, they said it was because of poor vacuum. Could this be right,
i.e. that the tube suffers from poor vacuum? Or am I guessing in the
completely wrong direction, and is there a blue glow in every VHF power tube?

Hope someone has an answer to this,

Thanks in advance,

P.Dingemans,
Rotterdam,
The Netherlands.


From [e-mail] Sat Nov 16 17:21:03 1996
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From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4cx250 glows blue-ish: what's wrong?
Date: Tue, 12 Nov 1996 08:50:30 +0000
Organization: Rutherford Appleton Laboratory, Oxon, UK
Lines: 17
Message-ID: <[e-mail]>
References: <habi.847111559@bauv111> <55r90p$[e-mail]> <[e-mail]> <560vpt$[e-mail]> <[e-mail]> <Pine.PCN.3.91.961111150959.7898B-100000@[130.115.53.199]>
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Peter Dingemans wrote:
>
> G'day everyone,
>
> A couple of weeks ago I built an amplifier, using a (surplus) 4cx250. The
> problem is: it doesn't work (much). Guess the coils/cap's aren't in the
> band yet.
>
> That's not the main problem, though. When I turn on the amp, you can see
> a blueish glow inside of the tube. It can only be noticed when it's dark,
> and is hard to see because of the ceramic envelope, but is definitely
> there. When I increase anode-current, the glow gets brighter.
>
It is Normal. It is what happend when electrons travelling at 50000
miles per second hit the anode and tube walls. The light flashes with
output power on SSB.  You get x-rays of TV tubes. Best not to look at
it.


From [e-mail] Sat Nov 16 17:21:04 1996
From: [e-mail] (David Covert)
Subject: RE: 4cx250 glows blue-ish: what's wrong?
Date: 12 Nov 96 14:29:45 -0800
References: <habi.847111559@bauv111> <55r90p$[e-mail]> <[e-mail]> <560vpt$[e-mail]> <[e-mail]> <Pine.PCN.3.91.961111150959.7898B-100000@[130.115.53.199]>
Message-ID: <[e-mail]>
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Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (msn.com)
Lines: 13

I am no expert on tubes, but I have messed about with high voltage
and vacuums.

Air will, like pretty much any gas (like neon or xenon or argon),
glow when 'pumped' by high voltage. Different gasses glow different
colors (like neon glows read). Air is rather interesting because it
will glow different colors based on it's pressure (or lack of
pressure). Air can glow both blue and lavender depending on how low
the pressure is.

No definite answer here... just a definite maybe... 8 }

73, dave kb5gog


From [e-mail] Sat Nov 16 17:21:05 1996
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From: William W Janssen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RE: 4cx250 glows blue-ish: what's wrong?
Date: 13 Nov 1996 18:32:19 GMT
Organization: CalWeb Internet Services, Inc.
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Try to see if the blue is on the glass surace or is inside the tube.

If on the suface then it is due to electrons striking the glass.

If inside then you have some gas in the tube and it will probably
give trouble due to incorrect grid current. I won't use a tube
that has internal gas (unless it's mercury in a rectifier).

Bill K7NOM



From [e-mail] Sat Nov 16 17:21:06 1996
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Newsgroups: rec.radio.amateur.homebrew
Subject: RE: 4cx250 glows blue-ish: what's wrong?
Message-ID: <[e-mail]>
From: COREY BICANICH <[e-mail]>
Date: Tue, 12 Nov 1996 17:24:14 EST
References: <habi.847111559@bauv111> <55r90p$[e-mail]><[e-mail].
 ch> <560vpt$[e-mail]><[e-mail]><Pine.PCN.3.91.961
 111150959.7898B-100000@[130.115.53.199]><[e-mail]>
Lines: 11

Blue glow is not unusual in power tubes.  I have never seen voltage gain
tubes have any blue glow, just power tubes.  The intensity alters with
power output.  Don't worry about the blue glow... there is no such thing
as a perfect vacuum.  A tube that has LOST its vacuum will not work at all
and is easily identified by a white haze or powder on the interior of the
glass bulb, near the base or the top.  I believe the blue is argon gas?
Gasses sometimes are "squeezed" from the anode and the other elements during
operation.  Sometimes the blue glow is very difficult to see, but I have never
seen a power tube in operation that did not have a blue glow somewhere inside.

-Corey


From [e-mail] Sat Nov 16 17:21:07 1996
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From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4cx250 glows blue-ish: what's wrong?
Date: Fri, 15 Nov 1996 08:37:04 +0000
Organization: Rutherford Appleton Laboratory, Oxon, UK
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[e-mail] wrote:
>
> In article <[e-mail]>, Mike Willis <[e-mail]>
> writes:
>
> >>
> >> That's not the main problem, though. When I turn on the amp, you can
> see
> >> a blueish glow inside of the tube. It can only be noticed when it's
> dark,
> >> and is hard to see because of the cera
>
SNIP
>
> Carl

Carl, I did not write this. Please be more careful in future.


From [e-mail] Sat Nov 16 17:21:08 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4cx250 glows blue-ish: what's wrong?
Date: Fri, 15 Nov 1996 08:26:19 -0700
Organization: Internet Access of Ventura County
Lines: 45
Message-ID: <[e-mail]>
References: <habi.847111559@bauv111> <55r90p$[e-mail]> <[e-mail]> <560vpt$[e-mail]> <[e-mail]> <Pine.PCN.3.91.961111150959.7898B-100000@[130.115.53.199]>
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In article <Pine.PCN.3.91.961111150959.7898B-100000@[130.115.53.199]>,
Peter Dingemans <[e-mail]> wrote:

> G'day everyone,
>
> A couple of weeks ago I built an amplifier, using a (surplus) 4cx250. The
> problem is: it doesn't work (much). Guess the coils/cap's aren't in the
> band yet.
>
> That's not the main problem, though. When I turn on the amp, you can see
> a blueish glow inside of the tube. It can only be noticed when it's dark,
> and is hard to see because of the ceramic envelope, but is definitely
> there. When I increase anode-current, the glow gets brighter.
>
> I vaguely remember reading something about this a long time ago; in that
> article, they said it was because of poor vacuum. Could this be right,
> i.e. that the tube suffers from poor vacuum? Or am I guessing in the
> completely wrong direction, and is there a blue glow in every VHF power tube
?
>
> Hope someone has an answer to this,
>
There are two reasons for a blue glow on a ceramic envelope.  The first
reason is ionizing air--i.e., a gassy tube.  The second reason is electrons
striking the inside of the envelope.  If a blue glow can be seen during
receive, the tube is gassy.  If the blue glow occurs only during transmit,
not to worry.  The vacuum is good.

When using low screen voltage tetrodes like te 4CX250..., it is important
to use the shunt-type screen V regulator because of the imminent danger of
reverse screen current.  A sample circuit can and discussion thereof can be
found at my Website:
the URL is
http://www.vcnet.com/measures/

 NOTE:  tubes made with manganese-bearing ceramic envelopes (Svetlana and
RCA) are much less likely to glow.  Manganese-bearing ceramic can be
identified by a purple colour---as opposed to the white color of pure
aluminum-oxide ceramic material used by other manufacturers.
Manganese-ceramic improves the flowability of the silver-solder that is
used to bond the ceramic envelope to the metal seals.
-------------------------
e-mail copy to Mr. Dingemans

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:21:09 1996
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
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From: [e-mail] (Paul Grohe)
Subject: Re: AM detector using PLL
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In the newsgroup sci.electronics.design.
Tim Dicus <[e-mail]> from
Prolectron thoughtfully posted:

> I found a schematic using a NE568 as an AM detector. It is in National
> Semiconductor's data book. I have an older version, but I would imagine
> it is in the new version too.

Could this possibly be an old Phillips or Signetics databook? "NE" is a Philli
ps
part.

We have an LMC568, which is akin to a 567, but is made specifically for
demodulating SAP/SCA/FSK *FM* subcarriers up to 500KHz.

 http://www.national.com/pf/LM/LMC568.html

The datasheet is only a few pages, and there are no "AM" detectors on it.

If it is our Databook, which one is it? I don't see that circuit in the
"Specific" or "Video" books or appnotes.

Cheers,
Paul Grohe

---------------------------------------------------------------
 Paul Grohe                     National Semiconductor Corp.
 Sr. Electronics Technician     2900 Semiconductor Drive
 AMPS New Products Eng Group    Mail Stop C2693
 Mailto:[e-mail]    Santa Clara, CA. 95052-8090 USA
 [phone] Tel             [phone] Fax

                 http://www.national.com

   For technical assistance, literature, or samples call:
       NORTH AMERICA                        EUROPE
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 mailto:[e-mail]    mailto:[e-mail]
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---------------------------------------------------------------


From [e-mail] Sat Nov 16 17:21:10 1996
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From: Michael Black <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Date: Fri, 8 Nov 1996 23:55:02 -0500
Organization: Libertel de Montreal/Montreal Libertel
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Xref: news1.epix.net sci.electronics.design:25147 rec.radio.amateur.homebrew:20939

But the 567, commonly used as a tone decoder, is a synchronous detector.
It has the PLL, and a separate product detector.  The only question, of
course, is whether or not the method added to give a high or low output
for the detected tone can be worked around to get a linear output.

It's been a while since I've looked in the old Signetics application
book for the section on PLL's.  SOmebody might have already worked on this.

The Signetics line of PLL's, which somewhere along the way got old
(I can remember when they were featured in the ham magazines as
the latest thing), did include devices with the additional product
detector (with a circuit that looks a lot like the circuit in the
now common NE602 mixer) needed for synchronous detection of AM.  The
NE560 or 561 (I forget which).  You could use any in the line, by
adding an external product detector.  Of course, this type of
synchronous detector is the basic kind.  You can get much fancier.

     Michael  VE2BVW

On Fri, 8 Nov 1996, Paul Grohe wrote:

> Tim Dicus <[e-mail]> from  Prolectron thoughtfully posted:
>
> > I found a schematic using a NE568 as an AM detector. It is in National
> > Semiconductor's data book. I have an older version, but I would imagine
> > it is in the new version too.
>
> Could this possibly be an old Phillips or Signetics databook? "NE" is a Phil
lips
> part.
> We have an LMC568, which is akin to a 567, but is made specifically for
> demodulating SAP/SCA/FSK *FM* subcarriers up to 500KHz.
>  http://www.national.com/pf/LM/LMC568.html
> The datasheet is only a few pages, and there are no "AM" detectors on it.
> If it is our Databook, which one is it? I don't see that circuit in the
> "Specific" or "Video" books or appnotes.
>
> Cheers,
> Paul Grohe
>


From [e-mail] Sat Nov 16 17:21:11 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!nntp.inet.fi!news.sci.fi!usenet
From: [e-mail] (Paul KeinΣnen)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Date: Sat, 09 Nov 1996 10:34:49 GMT
Organization: Scifi Communications International, http://www.sci.fi/, [e-mail], (931)3186277
Lines: 60
Message-ID: <561mo8$[e-mail]>
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Xref: news1.epix.net sci.electronics.design:25201 rec.radio.amateur.homebrew:20956

Michael Black <[e-mail]> wrote:

>But the 567, commonly used as a tone decoder, is a synchronous detector.
>It has the PLL, and a separate product detector.  The only question, of
>course, is whether or not the method added to give a high or low output
>for the detected tone can be worked around to get a linear output.
>

The Signetics application book states that the 567 has AM and FM
outputs, but that they are not optimized for linear demodulation. The
FM distortion is specified as 5 %. The maximum frequence for the 567
is 500 kHz.

Looking at the internal schematic diagram of the 567, the additional
product detector output is available at pin 1. An external capacitor
C3 is usually connected from pin 1 to ground, forming a low pass
filter with an internal 4k7 resistance. Pin 1 is also internally
connected to a comparator feeding the main (open collector) output at
pin 8.

Reducing the capasitance of the capacitor at pin 1 to a few nF, will
put the low pass filter cut-off frequency above the audio range and
the demodulated AM voltage is thus available at pin 1 (pin 8 is
unused).

>It's been a while since I've looked in the old Signetics application
>book for the section on PLL's.  SOmebody might have already worked on this.

>The Signetics line of PLL's, which somewhere along the way got old
>(I can remember when they were featured in the ham magazines as
>the latest thing), did include devices with the additional product
>detector (with a circuit that looks a lot like the circuit in the
>now common NE602 mixer) needed for synchronous detection of AM.  The
>NE560 or 561 (I forget which).

The NE561 has (had) an internal product detector for AM demodulation.
The maximum frequency is 30 MHz (with some extension tricks up to 60
MHz).

However, I have only seen the 567 in recent years (and some 565 a few
years ago) and I am afraid that the NE560-NE562 are no longer
available.

>You could use any in the line, by
>adding an external product detector.  Of course, this type of
>synchronous detector is the basic kind.  You can get much fancier.

It is important to note that the product detector used as the phase
comparator in the PLL operates at the quadrature of the AM carrier
signal. The product detector used for AM detection must be run in
phase with the AM carrier. Thus, there must be a 90 degree phase
difference between the VCO output for the phase comparator and the VCO
output for the AM demodulator.

>     Michael  VE2BVW

Paul OH3LWR





From [e-mail] Sat Nov 16 17:21:13 1996
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From: Rik Slingerland <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Date: 10 Nov 1996 19:22:30 GMT
Organization: Internet Access Eindhoven, the Netherlands
Lines: 48
Message-ID: <565a1m$[e-mail]>
References: <55h7bp$[e-mail]> <[e-mail]> <3283a802.4394752@139.187.128.43>
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Xref: news1.epix.net sci.electronics.design:25291 rec.radio.amateur.homebrew:20985

[e-mail] (Paul Grohe) wrote:
>
> In the newsgroup sci.electronics.design.
> Tim Dicus <[e-mail]> from
> Prolectron thoughtfully posted:
>
> > I found a schematic using a NE568 as an AM detector. It is in National
> > Semiconductor's data book. I have an older version, but I would imagine
> > it is in the new version too.
>
> Could this possibly be an old Phillips or Signetics databook? "NE" is a Phil
lips
> part.
>
> We have an LMC568, which is akin to a 567, but is made specifically for
> demodulating SAP/SCA/FSK *FM* subcarriers up to 500KHz.
>
>  http://www.national.com/pf/LM/LMC568.html
>
> The datasheet is only a few pages, and there are no "AM" detectors on it.
>
> If it is our Databook, which one is it? I don't see that circuit in the
> "Specific" or "Video" books or appnotes.
>
> Cheers,

Correct, it is a Philips IC used in a synchronous detector.
By the way: Philips is written with ONE 'L'!
A Philips employee
> Paul Grohe
>
> ---------------------------------------------------------------
>  Paul Grohe                     National Semiconductor Corp.
>  Sr. Electronics Technician     2900 Semiconductor Drive
>  AMPS New Products Eng Group  Mail Stop C2693
>  Mailto:[e-mail]    Santa Clara, CA. 95052-8090 USA
>  [phone] Tel             [phone] Fax
>
>                  http://www.national.com
>
>    For technical assistance, literature, or samples call:
>        NORTH AMERICA                      EUROPE
>        [phone]             [phone]
>  mailto:[e-mail]    mailto:[e-mail]
>  Usenet Disclaimer: Any opinions expressed are mine, not NSC's
>
>  PLEASE! NO Solicitors/Junkmail/Pyramid/Chain/MLM/Headhunters!
> ---------------------------------------------------------------



From [e-mail] Sat Nov 16 17:21:14 1996
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From: [e-mail] (Behzad Sadeghi)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Date: 13 Nov 1996 19:41:09 GMT
Organization: Princeton University
Lines: 50
Message-ID: <56d88l$[e-mail]>
References: <[e-mail]> <3283a802.4394752@139.187.128.43> <[e-mail]>
NNTP-Posting-Host: phoenix.princeton.edu
Xref: news1.epix.net sci.electronics.design:25609 rec.radio.amateur.homebrew:21086


i've never used plls for am demodulations, since it seems to
be an overkill. but i don't see anything wrong with using a
pll to demodulate an am signal. it works exactly the same way
as an fm demodulator (at least in theory). unless i'm missing
something.


In article <[e-mail]
l.montreal.qc.ca> Michael Black <[e-mail]> writes:
>But the 567, commonly used as a tone decoder, is a synchronous detector.
>It has the PLL, and a separate product detector.  The only question, of
>course, is whether or not the method added to give a high or low output
>for the detected tone can be worked around to get a linear output.
>
>It's been a while since I've looked in the old Signetics application
>book for the section on PLL's.  SOmebody might have already worked on this.
>
>The Signetics line of PLL's, which somewhere along the way got old
>(I can remember when they were featured in the ham magazines as
>the latest thing), did include devices with the additional product
>detector (with a circuit that looks a lot like the circuit in the
>now common NE602 mixer) needed for synchronous detection of AM.  The
>NE560 or 561 (I forget which).  You could use any in the line, by
>adding an external product detector.  Of course, this type of
>synchronous detector is the basic kind.  You can get much fancier.
>
>     Michael  VE2BVW
>
>On Fri, 8 Nov 1996, Paul Grohe wrote:
>
>> Tim Dicus <[e-mail]> from  Prolectron thoughtfully posted:
>>
>> > I found a schematic using a NE568 as an AM detector. It is in National
>> > Semiconductor's data book. I have an older version, but I would imagine
>> > it is in the new version too.
>>
>> Could this possibly be an old Phillips or Signetics databook? "NE" is a Phi
llips
>> part.
>> We have an LMC568, which is akin to a 567, but is made specifically for
>> demodulating SAP/SCA/FSK *FM* subcarriers up to 500KHz.
>>  http://www.national.com/pf/LM/LMC568.html
>> The datasheet is only a few pages, and there are no "AM" detectors on it.
>> If it is our Databook, which one is it? I don't see that circuit in the
>> "Specific" or "Video" books or appnotes.
>>
>> Cheers,
>> Paul Grohe
>>




From [e-mail] Sat Nov 16 17:21:15 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!mindspring!cssun.mathcs.emory.edu!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Antenna relays
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <55gpdt$[e-mail]>
Date: Mon, 4 Nov 1996 20:19:52 GMT
Lines: 19

In article <55gpdt$[e-mail]> [e-mail] (Ron Angle) writes
:
>I would appreciate input from anyone who has used separate relays for the
>input and output on grounded grid linear amplfiers (as opposed to using a
>single DPDT relay). Is there a problem if two separate relays do not close
>simultaneously?

There sure is. The output relay should close first. You don't want
to apply drive to the amplifier before there is a load on it. One
way to insure this is to use a relay sequencer. Another is to just
use a faster relay for the output than the input. Vacuum relays
are usually faster than ordinary open frame relays, and are often
used for amplifier output switching.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sat Nov 16 17:21:16 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in2.uu.net!news.vcnet.com!port6.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: Sun, 10 Nov 1996 05:57:47 -0700
Organization: Internet Access of Ventura County
Lines: 30
Message-ID: <[e-mail]>
References: <55gpdt$[e-mail]>
NNTP-Posting-Host: port6.vcnet.com

In article <55gpdt$[e-mail]>, [e-mail] (Ron Angle) wrote
:

> I would appreciate input from anyone who has used separate relays for the
> input and output on grounded grid linear amplfiers (as opposed to using a
> single DPDT relay). Is there a problem if two separate relays do not close
> simultaneously?

The primary consideration is that Both the RF input relay and the RF
output relay contacts in the amplifier be closed, and finished bouncing,
BEFORE the RF input signal arrives.  Some of the newer radios begin
delivering RF 5mS after switching from receive to transmit.  If the
amplifier relays are not fully closed in less than 5mS, relay contact
arcing is certain.

In Figure 7B on my Web site, an amplifier switching circuit is shown that
switches in about 2mS.  Also, see QST, January, 1994 "The Nearly Perfect
Amplifier".

We sell a parts kit for the circuit shown, including the Matsushita 1mS RF
reed relay used to switch the input, but minus the Jennings RJ1A vacuum
relay, which can be obtained for about $35 from Fair Radio Sales
419-227-6573.  The price of our QSK parts kit is $20, including a spare
51v, 1.5kw, voltage surge suppressor diode (D1).  If you don't want a
spare D1, subtract $1.50.  .

 If you are interested in seeing my Web site:  the URL is
http://www.vcnet.com/measures/

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:21:17 1996
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From: [e-mail] (Lawrence Wald)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: Tue, 12 Nov 1996 11:00:32 -0400
Organization: NASA Lewis Research Center
Lines: 27
Message-ID: <[e-mail]>
References: <[e-mail]> <55lh93$[e-mail]>
NNTP-Posting-Host: lwald.lerc.nasa.gov

I presume a DPDT is okay to use in this application.

Larry, KE8GW


In article <55lh93$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In article <[e-mail]>, [e-mail] (W6KKT
> Jesse) writes:
>
> >
> >Hi Tom, what timeing would you recommend for the close / open and how
> >would the average ham go about achieving it?
> >73, Jesse, W6KKT
>
> As long as the antenna closes first, and opens last, you will be ok.
>
> The amount of delay is unimportant, I'd make it enough to always guarantee
> a correct sequence,  perhaps a minimum stagger of 10-20% of the slowest
> relay's response time.
>
> 73 Tom

--
Larry Wald
NASA Lewis Research Center


From [e-mail] Sat Nov 16 17:21:18 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!news.structured.net!nntp.teleport.com!nntp0.teleport.com!usenet
From: [e-mail] (Kevin Smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Antenna software
Date: Mon, 11 Nov 1996 08:28:30 GMT
Organization: Teleport - Portland's Public Access [phone]
Lines: 8
Message-ID: <566o55$[e-mail]>
NNTP-Posting-Host: ip-longv1-14.teleport.com
X-Newsreader: Forte Free Agent 1.0.82

I am looking for a GOOD, and THOUROUGH program to create all means of
antennas:  HF, VHF, UHF,  etc...  1/2 Wave, 5/8 Wave, J-pole.  etc...
All means!!  If anybody knows of such a program, email me at
[e-mail].

'73
Kevin  KC7EPH



From [e-mail] Sat Nov 16 17:21:19 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!fu-berlin.de!informatik.tu-muenchen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!stefans
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: antenna tuner design
Date: 11 Nov 96 14:54:31 GMT
Organization: University of the Federal Armed Forces Munich
Lines: 12
Message-ID: <stefans.847724071@bauv111>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de
X-Newsreader: NN version 6.5.0 #3 (NOV)

Paul Butler <[e-mail]> writes:

>I am looking for some schematics on antenna tuners that can be built. If
>anyone knows of any please let me know.

Please consider my article "A more versatile Transmatch" in QST for
July 1982, pp. 31 ff.
--
Claude
([e-mail])
The opinions expressed above represent those of the writer
and not necessarily those of her employer.


From [e-mail] Sat Nov 16 17:21:20 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: 10 Nov 1996 21:45:07 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 15
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <5651g2$[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Newsreader: AOL Offline Reader

In article <5651g2$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>
>Because that's the right way to do it.  Unfortunately, right or nor,
>it is not the standard way to do it.

There is no right way to make a measurement, only a standard way.

If a volt is only a volt because of how they decided to measure it.

It doesn't matter how the term is defined, so long as everyone uses the
same definition.

73 Tom


From [e-mail] Sat Nov 16 17:21:21 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!not-for-mail
From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: ARRL IMD MEASUREMENTS??
Date: Sun, 10 Nov 1996 15:46:10 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 8
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: dyn9.frazmtn.com
X-Newsreader: Forte Agent .99e/16.227


Does anyone know why when the ARRL labs test, revue and publish IMD
findings on new transceivers, and linear amplifiers they compare the
IMD products to the sum of the two tones (PEP output of the two tones
combined)?  Doing the test this way makes the IMD measurements look
6db better than what they actually are (compared to commercial
standards).
73, Jesse, W6KKT


From [e-mail] Sat Nov 16 17:21:22 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: 10 Nov 1996 16:22:38 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 23
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail] (W6KKT
Jesse) writes:

>Does anyone know why when the ARRL labs test, revue and publish IMD
>findings on new transceivers, and linear amplifiers they compare the
>IMD products to the sum of the two tones (PEP output of the two tones
>combined)?  Doing the test this way makes the IMD measurements look
>6db better than what they actually are (compared to commercial
>standards).
>73, Jesse, W6KKT
>
>

They did in the past, but I haven't followed the
situation lately.  I asked about the practice back
in the 1970s -- but didn't receive an answer. The
preferred method is often called the "Collins method"
for taking IMD readings, the tones are set to the 0
graticule, and the IMD products read directly down
from that point.

Peter
Communications Quarterly Magazine


From [e-mail] Sat Nov 16 17:21:23 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: Sun, 10 Nov 1996 16:56:33 GMT
Organization: INTERNET AMERICA
Lines: 20
Message-ID: <5651g2$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dal36-20.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (W6KKT Jesse) wrote:
>Does anyone know why when the ARRL labs test, revue and publish IMD
>findings on new transceivers, and linear amplifiers they compare the
>IMD products to the sum of the two tones (PEP output of the two tones
>combined)?

Because that's the right way to do it.  Unfortunately, right or nor,
it is not the standard way to do it.  The international standard is to
use either of the two (equal amplitude) tones as the reference.  That
makes the IMD look 6 db worse than it actually is. Dave Russel, then
of RF Comm, was on the committee that made the recommendation.
According to him, the committee couldn't get a handle on PEP so they
compromised.


Fred

[e-mail]
[e-mail]



From [e-mail] Sat Nov 16 17:21:26 1996
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From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: Mon, 11 Nov 1996 14:23:01 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 27
Distribution: world
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References: <[e-mail]> <5651g2$[e-mail]>
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X-Newsreader: Forte Agent .99e/16.227

On Sun, 10 Nov 1996 16:56:33 GMT, [e-mail] (J. Fred Riley)
wrote:

>[e-mail] (W6KKT Jesse) wrote:
>>Does anyone know why when the ARRL labs test, revue and publish IMD
>>findings on new transceivers, and linear amplifiers they compare the
>>IMD products to the sum of the two tones (PEP output of the two tones
>>combined)?
>
>Because that's the right way to do it.  Unfortunately, right or nor,
>it is not the standard way to do it.  The international standard is to
>use either of the two (equal amplitude) tones as the reference.  That
>makes the IMD look 6 db worse than it actually is. Dave Russel, then
>of RF Comm, was on the committee that made the recommendation.
>According to him, the committee couldn't get a handle on PEP so they
>compromised.

"Because that's the right way to do it"?  Can you be a bit more
specific?  What is the theory behind ARRLs IMD measurement
interpolation?  In the sixties and seventies their measurement
technique coincided with every other manufacturer of commercial high
power sideband transmitters,amplifiers, tubes, analyzer equipment,
etc.(Collins Radio, TMC, Continental, Eimac).  Somewhere along the way
they adopted a more lenient (6db) measurement interpretation for their
revue of new equipment. Why?
73, Jesse, W6KKT



From [e-mail] Sat Nov 16 17:21:26 1996
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From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: 11 Nov 1996 19:57:12 GMT
Organization: American Information Systems, Inc.
Lines: 30
Message-ID: <5680eo$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Carl Stevenson)
NNTP-Posting-Host: ts02-13.dialup.ais.net
X-Newsreader: IBM NewsReader/2 v1.2.5

In <[e-mail]>, [e-mail] (W6KKT Jesse) writes
:
>
>Does anyone know why when the ARRL labs test, revue and publish IMD
>findings on new transceivers, and linear amplifiers they compare the
>IMD products to the sum of the two tones (PEP output of the two tones
>combined)?  Doing the test this way makes the IMD measurements look
>6db better than what they actually are (compared to commercial
>standards).
>73, Jesse, W6KKT

It certainly DOES make the result look 6 dB better compared to
commercial standard test methods ... I'm sure that those who place ads
in Q$T LIKE that ...

Actually, it's pretty insulting if you think about it ... they're taking
avantage of the fact that many, many of today's appliance operators are
not technically astute enought to even recognize the fact that that 6 dB
discrepancy exists ... and that's a sad statement on the state of ham
radio, too ...

It's bad enought that the advertisers are willing to try to pull this
one over on us ... it's even WORSE that the ARRL is actively
participating in the sham! (guess what, it doesn't surprise me in the
least!)


Carl - wa6vse
[e-mail]




From [e-mail] Sat Nov 16 17:21:30 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!uunet!in2.uu.net!news-in.iadfw.net!usenet
From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: Tue, 12 Nov 1996 02:47:57 GMT
Organization: INTERNET AMERICA
Lines: 35
Message-ID: <568ogv$[e-mail]>
References: <[e-mail]> <5651g2$[e-mail]> <[e-mail]>
NNTP-Posting-Host: dal51-15.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (W6KKT Jesse) wrote:

>"Because that's the right way to do it"?  Can you be a bit more
>specific?  What is the theory behind ARRLs IMD measurement
>interpolation?

I don't remember history that way, Jesse. (My mind may be going with
advancing age.)  The IMD products in all the early articles were
always referenced to PEP output.  When the international standard
measurement method was adopted--because the definition of PEP couldn't
be agreed on--ARRL apparently decided not to follow a procedure that
was logically flawed.  The flaw is simply that the amplifier, with two
equal strength tones, has a Peak Output Power four times the level of
either tone.  The distortion products produced by that amplifier, when
referred to the PEP of the amplifier, translate directly into
intermodulation distortion and reflect the power output of the
distortion products.

The contrary opinion holds that either way we have a test of amplifier
linearity and that lower numbers mean better performance.  But, in
fact, certains numbers--like 30, 35, and 40--have an almost magical
significance.  When a spec is writen for -40 db IMD relative to either
tone, the customer is really asking for an amplifier whose distortion
is -46 db down.  And that's a tough 6 db.

I would charactericterize my position on this as adamantine.  Tom is
technically correct--as he so often is.  But IEC can decide that white
is black and I would still see white.


Fred

[e-mail]
[e-mail]



From [e-mail] Sat Nov 16 17:21:31 1996
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From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: Tue, 12 Nov 1996 16:07:02 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 39
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <5651g2$[e-mail]> <[e-mail]> <568ogv$[e-mail]>
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X-Newsreader: Forte Agent .99e/16.227

On Tue, 12 Nov 1996 02:47:57 GMT, [e-mail] (J. Fred Riley)
wrote:
>I don't remember history that way, Jesse. (My mind may be going with
>advancing age.)  The IMD products in all the early articles were
>always referenced to PEP output.

1975 ARRL Handbook (page 400)  has several examples of the correct way
to measure IMD.  They reference the IMD to a single tone of two equal
tones.

 When the international standard measurement method was
adopted--because the definition of PEP couldn't
>be agreed on--ARRL apparently decided not to follow a procedure that
>was logically flawed.  The flaw is simply that the amplifier, with two
>equal strength tones, has a Peak Output Power four times the level of
>either tone.  The distortion products produced by that amplifier, when
>referred to the PEP of the amplifier, translate directly into
>intermodulation distortion and reflect the power output of the
>distortion products.
>
>The contrary opinion holds that either way we have a test of amplifier
>linearity and that lower numbers mean better performance.  But, in
>fact, certains numbers--like 30, 35, and 40--have an almost magical
>significance.  When a spec is writen for -40 db IMD relative to either
>tone, the customer is really asking for an amplifier whose distortion
>is -46 db down.  And that's a tough 6 db.

In the past, I have conducted many commercial side band, field
specification acceptance tests.  We always referenced IMD to a single
tone of two equal tones.  -37 to -40 (3rd order) was the norm.  Using
ARRLs method the IMD would be -42 and -46.

Eimac, Today, in their book "Care and Feeding of Power Grid Tubes"
make a point of stating (page 71);  "It is NOT correct to compare one
distortion product to the sum of the two tones; that is to say, the
PEP value of the signal". (ARRLs method).

ARRLs interpolation reminds me of the EPA gas mileage on new
cars.......It looks real good.....??


From [e-mail] Sat Nov 16 17:21:32 1996
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From: "Thomas W. Castle" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Mon, 11 Nov 1996 01:48:36 -0500
Lines: 15
Message-ID: <[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <55remb$[e-mail]> <[e-mail]>
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To: "L. M. Rappaport" <[e-mail]>
In-Reply-To: <[e-mail]>
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How do you damage the reputation of a Lawer?????????????????????

The only difference I know between a Lawyer, Politician & a Crook is:

1. A politician is Lawyer, who is usually a Crook, who must be elected
to screw the public...

2. A Lawyer is a Crook who knows how the system is used to screw anyone...

3. A crook is a person who hasn't figured out how to become a lawyer or
politician - YET.....!

De Tom....




From [e-mail] Sat Nov 16 17:21:33 1996
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From: "Thomas W. Castle" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Mon, 11 Nov 1996 02:07:04 -0500
Lines: 14
Message-ID: <[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <55remb$[e-mail]> <[e-mail]> <[e-mail]>
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To: Kent Winrich <[e-mail]>
In-Reply-To: <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.antenna:31412 rec.radio.amateur.digital.misc:20029 rec.radio.amateur.dx:1278 rec.radio.amateur.equipment:42157 rec.radio.amateur.homebrew:21001 rec.radio.amateur.misc:117978 rec.radio.amateur.policy:43017 rec.radio.amateur.space:8781


Fun to watch - guys....

Question:  DO YOU know how to "look" up his call in QRZ or Sams' an
write him a letter..?

What is the difference between a: lawyer, politician & a crook???

HINT: [NONE!]

De Tom...





From [e-mail] Sat Nov 16 17:21:33 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Tue, 12 Nov 1996 05:17:28 GMT
Organization:
Lines: 25
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"Thomas W. Castle" <[e-mail]> wrote:

>How do you damage the reputation of a Lawer?????????????????????
>
>The only difference I know between a Lawyer, Politician & a Crook is:
>
>1. A politician is Lawyer, who is usually a Crook, who must be elected
>to screw the public...
>
>2. A Lawyer is a Crook who knows how the system is used to screw anyone...
>
>3. A crook is a person who hasn't figured out how to become a lawyer or
>politician - YET.....!
>
>De Tom....
>
>
Do you know why a shark will never bite a lawyer?

Professional Courtesy.


--
73,
Butch N2YMJ


From [e-mail] Sat Nov 16 17:21:34 1996
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From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Tue, 12 Nov 1996 08:41:26 +0000
Organization: Rutherford Appleton Laboratory, Oxon, UK
Lines: 14
Message-ID: <[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <55remb$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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Thomas W. Castle wrote:
>
> Fun to watch - guys....
>
> Question:  DO YOU know how to "look" up his call in QRZ or Sams' an
> write him a letter..?
>
> What is the difference between a: lawyer, politician & a crook???
>
> HINT: [NONE!]
>
> De Tom...

Never heard of an, "Honest crook" then?


From [e-mail] Sat Nov 16 17:21:35 1996
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From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: 13 Nov 1996 14:21:44 GMT
Organization: Your Organization
Lines: 7
Distribution: world
Message-ID: <56clho$8cp$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <55remb$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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This is really getting off topic, but I couldn't resist:
What's the difference between a dead dog on the road and a dead lawer on the
road?

There are skid marks in front of the dog!
Tyler



From [e-mail] Sat Nov 16 17:21:38 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Tue, 12 Nov 1996 17:04:11 -0700
Organization: Internet Access of Ventura County
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In article <55remb$[e-mail]>, [e-mail] (.) wrote:

> In article <01bb739f.8e9f00c0$[e-mail]>,
>    "James S. Kaplan" <[e-mail]> wrote:
> >ARRL lawyer to sue member
> >
> >The following is a copy of a message I received today from
> >ARRL General Counsel Christopher D. Imlay N3AKD:
> >
> >
> >To:       James S. Kaplan, KG7FU
> >Copies:   Mary Lou Brown, NM7N
> >          Terry Baun
> >          John Poray
> >Date:     July 16, 1996
> >Re:       Your article, SBE Chapter 124 Newsletter, July, 1996
> >**************************************************************
> >
> >     Jim, I have just finished reading your article in the July,
> >1996 Water Cooled Newsletter, page 6. In it, you argue that two of
snip....

 Failing that, I am going to sue
> >you in the District of Columbia for libel.

In California, it is against the law to threaten to sue.

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:21:39 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV Equipment, I wish to construct.
Date: 15 Nov 1996 13:43:35 GMT
Organization: AOL http://www.aol.com
Lines: 11
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com

I would like to make a ATV transmitter and downconverter.  I am willing to
use surplus equipment.  I have an old military tv transmitter but I think
it will never be able to put out color as the voltage swing would have to
be to high.  I would like plans for scratch built as well as ideas for
used/surplus and modifications.  As this will be an interesting project if
it gets off the ground I would like the responses to this post to be in
this forum.  E mail is ok too.

Thanks.

Andrew


From [e-mail] Sat Nov 16 17:21:40 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.tacom.army.mil!wx8l
From: [e-mail] (Sean McCarthy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Beefing up a twin 3-500Z amp...
Date: Wed, 13 Nov 96 05:42:11 GMT
Organization: Vetronics Technology Center, US Army TACOM, Warren, Michigan USA
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Message-ID: <56bn3j$[e-mail]>
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Anyone have any experience beefing up a 2 X 3-500Z amp? (Drake L4-B)

I'm wondering what the best power supply configuration would be for
maximum capability.

Thoughts so far are 3500V @ 1A CCS using a Dahl Hypersil.
(multi tap or variac for adjustment???)

Any insight or preferably experience would be apprieciated.

Sean


From [e-mail] Sat Nov 16 17:21:41 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!interaccess!d107.nnb.interaccess.com!wiley
From: [e-mail] (Bill Gode)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Beefing up a twin 3-500Z amp...
Date: Wed, 13 Nov 1996 09:07:54 -0600
Organization: InterAccess, Chicago's best Internet Service Provider
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References: <56bn3j$[e-mail]>
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In article <56bn3j$[e-mail]> [e-mail] (Sean McCar
thy) writes:
>From: [e-mail] (Sean McCarthy)
>Subject: Beefing up a twin 3-500Z amp...
>Date: Wed, 13 Nov 96 05:42:11 GMT


>Anyone have any experience beefing up a 2 X 3-500Z amp? (Drake L4-B)


I made a big homebrew supply for both the L-4B and L-7 amplifiers,
but my intent was to get reliable RTTY performance rather than to
increase plate voltage and resultant output.  The difference in output
between running a pair of 3-500Zs at 3500 volts vs. 2500 volts just
isn't worth the cost of the parts and the additional heat generated.

The L-4B needs additional cooling air, if you run higher voltage.  The
easy way is to put a muffin fan on the cabinet top, pulling air out.
The L-7 has a more efficient 2-speed cooling fan and is acceptable as-is.

The weak link in the Drake amplifiers is the voltage rating on the plate
tuning capacitor.  If you boost the B+ to much more than 3000 volts and
try to tune-up into anything more than flat VSWR, you will probably
experience arcing in the tuning cap.  I went back to the original Drake
power supply as the design voltages and currents are properly matched
to the rest of the RF deck.  You might want to up-grade the HV rectifiers
in the Drake power supply and leave the rest original.

73,

Bill, WA9NHQ


From [e-mail] Sat Nov 16 17:21:42 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!uunet!in2.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Beefing up a twin 3-500Z amp...
Date: Fri, 15 Nov 1996 07:34:14 -0700
Organization: Internet Access of Ventura County
Lines: 46
Message-ID: <[e-mail]>
References: <56bn3j$[e-mail]>
NNTP-Posting-Host: port27.vcnet.com
Mime-Version: 1.0
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X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <56bn3j$[e-mail]>, [e-mail] (Sean
McCarthy) wrote:

> Anyone have any experience beefing up a 2 X 3-500Z amp? (Drake L4-B)
>
> I'm wondering what the best power supply configuration would be for
> maximum capability.
>
> Thoughts so far are 3500V @ 1A CCS using a Dahl Hypersil.
> (multi tap or variac for adjustment???)
>
> Any insight or preferably experience would be apprieciated.
>
I know some hams who were successful in using 4kV in the Drake L4-B.  The
factory-stock bandswitch, tuning capacitor, and blocking capacitor can
withstand the increased voltage.  With a triode, increasing the anode
supply voltage means increased gain.  This means that the 3-500Zs can be
driven to full output with around 100w instead of the typical 125w.  There
is, however,  a trade-off to more gain.

 Even though intermittent vhf parasitic oscillation is rare in the L4-B,
with a substantive increase in supply voltage--and gain--, more instances
of such oscillation have been reported.   This problem can be lessened by
using lower vhf-Q parasitic suppressors.  With lower vhf-Q suppressors, the
vhf load R on the anodes decreases.  Less vhf load R means less vhf gain,
and improved vhf stability.  (see "Parasitics Revistited" in the Sept. and
Oct. 1990 issues of QST.)

 Another problem is that the factory-stock relay in the L4-B is not quick
enough to keep up with modern radios.  Thus, high speed t-r switching is
needed to avoid hot switching.  See the Jan. 1994 issue of QST magazine,
"The Nearly Perfect Amplifier".   Additional info on high speed switching
can be found at my Website.  Info on the somewhat-surprising pep
capabilities of Peter Dahl's Hipersilü transformers is also available.  See
*Amplifiers*......    the URL is
http://www.vcnet.com/measures/

 A multitap secondary HV transformer is the most efficient and cost
effective means of reducing the anode supply voltage.  Peter Dahl charges
little for each additional secondary tap.  For CW, RTTY, and FM, a 60%
secondary tap is about right.
-------------------------------
e-mail copy to Mr. McCarthy

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:21:43 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!news.inc.net!not-for-mail
From: "Michael W. Moran" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.electronics.equipment
Subject: Re: BIRD 43 Help/Tutorial
Date: Sat, 09 Nov 1996 15:38:17 -0600
Organization: Internet Connect, Inc. The Wisconsin ISP 414-476-4266 http://www.inc.net
Lines: 16
Message-ID: <[e-mail]>
References: <01bbcb72$93899c00$01a447cc@desktop> <[e-mail]> <01bbcdbd$92d58380$89ecbdcc@rsmith>
Reply-To: [e-mail]
NNTP-Posting-Host: 206.230.215.76
Mime-Version: 1.0
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To: Bob Smith <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.antenna:31307 rec.radio.amateur.equipment:42066 rec.radio.amateur.homebrew:20959 sci.electronics.equipment:8842

BOB:

   I believe the sample port is -40dB down from the input power.  Slugs
for this beast tend to be rather expensive since they each cover a
limited frequency and power range, but it is indeed easy to use.  Just
insert the slug with the arrow pointing to the antenna to measure
forward power, toward the transmitter to measure reflected.

   I don't know how wide a freq/power range you need or what you paid
for the 43.  If you find yourself looking at a big $$$ outlay for slugs,
you might want to sell the 43 and look at a Telewave 44 which is
wideband (30-1000 MHz) and has switches for power range and
forward/reflected... no slugs needed.  I've used one for about 5 years
and never had a problem with it.

Mike M.


From [e-mail] Sat Nov 16 17:21:44 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in2.uu.net!netnews.worldnet.att.net!newsadm
From: altavoz <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.electronics.equipment
Subject: Re: BIRD 43 Help/Tutorial
Date: Sat, 09 Nov 1996 21:56:17 -0800
Organization: worldnet.att.net
Lines: 31
Message-ID: <[e-mail]>
References: <01bbcb72$93899c00$01a447cc@desktop> <[e-mail]> <01bbcdbd$92d58380$89ecbdcc@rsmith>
NNTP-Posting-Host: 207.147.208.228
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Xref: news1.epix.net rec.radio.amateur.antenna:31320 rec.radio.amateur.equipment:42087 rec.radio.amateur.homebrew:20966 sci.electronics.equipment:8850

Bob Smith wrote:
>
> >>>altavoz: Many slugs and $$$thousands of dollars later ......
> WHY NOT BUY AN MFJ249/209 ?
>
> No good above 150 Mhz!
>
> altavoz <[e-mail]> wrote in article
> <[e-mail]>...
> Bob Smith wrote:
> >
> > Can someone kindly point me to a tutorial on the Bird 43 watt meter.
> Just
> > got one used without a manual.  They look very simple to use.
> >
> > I do have a RF Sampler fitted - what range out output does this have? -
> > would hate to blow my frequency meter or o-scope.!
> >
> > Thanks a million for reading.
> >
> > --
> > >>>>
> > Bob Smith    N3FTU
> > Atlanta, GA
>
> altavoz: Many slugs and $$$thousands of dollars later ......
> WHY NOT BUY AN MFJ249/209 ?
>


Good thinking , Bob , its probably no good over 5 gig's either.


From [e-mail] Sat Nov 16 17:21:45 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.consultix.com!newshost.cyberramp.net!usenet
From: johnf <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Build Stuff
Date: Sat, 09 Nov 1996 08:29:04 -0800
Organization: CyberRamp.net, Dallas, TX [phone]/[phone] for info
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: dal-tsa2-p1-47.cyberramp.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.01 (Win16; U)

http://www.cyberramp.net/~johnf


From [e-mail] Sat Nov 16 17:21:46 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!newshub.tc.umn.edu!fu-berlin.de!news-ber1.dfn.de!news.b.shuttle.de!news.k.shuttle.de!news-koe1.dfn.de!news.kfa-juelich.de!djukfa11!iff161
Organization: Forschungszentrum Juelich
Date: Thu, 14 Nov 1996 21:27:42 +01
From: Bob Mueller <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Can I flash the getter again?
Lines: 7

If a tube develops gas problems can the getter be once more fired to pick up
the gas and rescue the tube (assuming it is a type expensive enough to justify
the effort.)?



               Bob


From [e-mail] Sat Nov 16 17:21:48 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!news-out.communique.net!gatech!csulb.edu!hammer.uoregon.edu!arclight.uoregon.edu!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!not-for-mail
From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: car-alarm type transmitters
Date: 14 Nov 1996 01:08:01 GMT
Organization: Your Organization
Lines: 22
Distribution: world
Message-ID: <56drdh$i4p$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sl98.cyberia.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

In article <[e-mail]>, [e-mail] says...
>
>Hi All,
>
>I am trying to find someone who sells car-alarm style remote control
>transmitters / receivers.
>
>My task is to transmit an alarm indication (or, perhaps some data) with
>a range of approx. 60 feet.
>
>I'm not an RF guru, so I don't know where to start...
>
>I realise that this is not a 'proper' amature radio topic, but I have
>been sent here because you Guys and Gals are the experts.
>
>Cheers,
>Grant
How about a set of those remote control extenders from Radio Shack?  You could

wire a remote of ANY sort to the transmitter.  You would have all sorts of
functions then.  Just a thought...
TYler



From [e-mail] Sat Nov 16 17:21:48 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!arclight.uoregon.edu!news.uoregon.edu!waikato!auckland.ac.nz!news
From: "G. Sargent" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: car-alarm type transmitters
Date: Thu, 14 Nov 1996 11:52:57 +1300
Organization: The University of Auckland, New Zealand
Lines: 15
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: g.sargent.mech.auckland.ac.nz
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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Hi All,

I am trying to find someone who sells car-alarm style remote control
transmitters / receivers.

My task is to transmit an alarm indication (or, perhaps some data) with
a range of approx. 60 feet.

I'm not an RF guru, so I don't know where to start...

I realise that this is not a 'proper' amature radio topic, but I have
been sent here because you Guys and Gals are the experts.

Cheers,
Grant


From [e-mail] Sat Nov 16 17:21:49 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: car-alarm type transmitters
Date: 13 Nov 1996 17:28:25 -0800
Organization: BEST Internet Communications
Lines: 24
Message-ID: <56dsjp$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <[e-mail]>,
G. Sargent <[e-mail]> wrote:
>Hi All,
>
>I am trying to find someone who sells car-alarm style remote control
>transmitters / receivers.
>
>My task is to transmit an alarm indication (or, perhaps some data) with
>a range of approx. 60 feet.
>
>I'm not an RF guru, so I don't know where to start...
>
>I realise that this is not a 'proper' amature radio topic, but I have
>been sent here because you Guys and Gals are the experts.
>
>Cheers,
>Grant

I was browsing through the Digi-Key catalog (http://www.digikey.com/)
and noticed they have some rc modules for alarm systems and garage
door openers made by Holtek.  You might check them out.

Steve M.



From [e-mail] Sat Nov 16 17:21:50 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.infi.net!usenet
From: "Eric" <[e-mail]>
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateu
Subject: Club WWW site
Date: 13 Nov 1996 09:06:56 GMT
Organization: InfiNet Technical Support
Lines: 6
Message-ID: <01bbd141$bc5224c0$[e-mail]>
NNTP-Posting-Host: ts86.tech.infi.net
X-Newsreader: Microsoft Internet News 4.70.1155
Xref: news1.epix.net rec.radio.amateur.antenna:31501 rec.radio.amateur.boatanchors:497 rec.radio.amateur.digital.misc:20061 rec.radio.amateur.dx:1297 rec.radio.amateur.equipment:42246 rec.radio.amateur.homebrew:21061 rec.radio.amateur.misc:118119

This is the Hamtpon Roads Radio Association web site you may be interested
in.  We are located in Norfolk Virginia.  Let me know what you think!

Eric KE4KIK 73!

http://www.infi.net/hrra


From [e-mail] Sat Nov 16 17:21:51 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newsstand.cit.cornell.edu!cornellcs!rochester!casaba.srv.cs.cmu.edu!das-news2.harvard.edu!oitnews.harvard.edu!canopus.hbs.edu!news-in.tiac.net!posterchild![e-mail]
From: [e-mail] (Ellis G.)
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateu
Subject: Re: Club WWW site
Date: Wed, 13 Nov 1996 22:01:58 GMT
Organization: The Internet Access Company, Inc.
Lines: 17
Message-ID: <56dg4i$[e-mail]>
References: <01bbd141$bc5224c0$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: p8.ts17.bedfo.ma.tiac.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news1.epix.net rec.radio.amateur.antenna:31538 rec.radio.amateur.boatanchors:505 rec.radio.amateur.digital.misc:20073 rec.radio.amateur.dx:1306 rec.radio.amateur.equipment:42278 rec.radio.amateur.homebrew:21078 rec.radio.amateur.misc:118153

"Eric" <[e-mail]> wrote:

>This is the Hamtpon Roads Radio Association web site you may be interested
>in.  We are located in Norfolk Virginia.  Let me know what you think!

Very cool!

(it took forevvvvvvvvvvvvver to load!)

Ellis


------------------------------------------------------------------------------
----------------------
PhotoImpressions: Art Rubber Stamps from your Photographs!
http://www.tiac.net/users/ellis
------------------------------------------------------------------------------
----------------------



From [e-mail] Sat Nov 16 17:21:52 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!feed1.news.erols.com!uunet!in2.uu.net!news1.isp.net!news.infinex.com!news3.crl.com!nexp.crl.com!usenet
From: Dave Booth <[e-mail]>
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateu
Subject: Re: Club WWW site
Date: Thu, 14 Nov 1996 15:25:18 -0800
Organization: KC6WFS
Lines: 13
Message-ID: <[e-mail]>
References: <01bbd141$bc5224c0$[e-mail]>
NNTP-Posting-Host: 165.113.223.131
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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To: Eric <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.antenna:31574 rec.radio.amateur.boatanchors:518 rec.radio.amateur.digital.misc:20086 rec.radio.amateur.dx:1312 rec.radio.amateur.equipment:42336 rec.radio.amateur.homebrew:21099 rec.radio.amateur.misc:118199

Eric wrote:
>
> This is the Hamtpon Roads Radio Association web site you may be interested
> in.  We are located in Norfolk Virginia.  Let me know what you think!
>
> Eric KE4KIK 73!
>
> http://www.infi.net/hrra

I'll go and check it out!
http://www.geocities.com/Hollywood/5860
--
Dave Booth kc6wfs


From [e-mail] Sat Nov 16 17:21:53 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in2.uu.net!news.genuity.net!news.lafn.org!usenet
From: [e-mail] (Jimmy Navarro)
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateu
Subject: Re: Club WWW site
Date: 15 Nov 1996 07:16:37 GMT
Organization: KE6FPK
Lines: 12
Message-ID: <56h5cl$[e-mail]>
References: <01bbd141$bc5224c0$[e-mail]>
NNTP-Posting-Host: 192.168.13.19
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
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In article <01bbd141$bc5224c0$[e-mail]>,
[e-mail] says...
>
>This is the Hamtpon Roads Radio Association web site you may be interested
>in.  We are located in Norfolk Virginia.  Let me know what you think!
>
>Eric KE4KIK 73!
>
>http://www.infi.net/hrra
How much do your ISP charge for home page?  I'd like to build a Web site for
an open repeater club.  73!



From [e-mail] Sat Nov 16 17:21:54 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!news.tds.net!news
From: DANNY STALLINGS <[e-mail]>
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateu
Subject: Re: Club WWW site
Date: Fri, 15 Nov 1996 12:56:12 -0500
Organization: TDS Telecom - Madison, WI
Lines: 17
Message-ID: <[e-mail]>
References: <01bbd141$bc5224c0$[e-mail]> <56h5cl$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ceal0-a09.peop.tds.net
Mime-Version: 1.0
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Jimmy Navarro wrote:
>
> In article <01bbd141$bc5224c0$[e-mail]>,
> [e-mail] says...
> >
> >This is the Hamtpon Roads Radio Association web site you may be interested
> >in.  We are located in Norfolk Virginia.  Let me know what you think!
> >
> >Eric KE4KIK 73!
> >
> >http://www.infi.net/hrra
> How much do your ISP charge for home page?  I'd like to build a Web site for
> an open repeater club.  73!
NICE PAGE BUT TAKES FOREVERE AT 28.8 TO LAOD.
PLEASE VISIT MY HOMEPAGE AT
HTTP://WWW.GEOCITIES.COM/HEARTLAND/3764
DAN-KC4OR


From [e-mail] Sat Nov 16 17:21:55 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!usenet.eel.ufl.edu!news.alt.net!newspost1.alt.net!usenet
From: "Peter Gottlieb" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Digital Audio/data streams
Date: 9 Nov 1996 02:24:49 GMT
Organization: Altopia Corp. - Affordable Usenet Access - http://www.alt.net
Lines: 15
Message-ID: <01bbcde5$3417cb00$d9102399@peter-s>
References: <EZ6q$[e-mail]>
X-Newsreader: Microsoft Internet News 4.70.1155
Xref: news1.epix.net rec.radio.amateur.homebrew:20918 uk.radio.amateur:22580

Steve Simpson <[e-mail]> wrote in article
<EZ6q$[e-mail]>...
> I would like to experiment with A/D and D/A audio over radio.

Try checking out the Motorola CVSD chip.  It was a while ago, but I thing
the numbers were
MC3417 for 3 bit version and MC3418 for 4 bit version.  Look up the app
circuit in the data
book, and build it EXACTLY as shown, and you will get decent results even
with the 3 bit
version.


...Peter



From [e-mail] Sat Nov 16 17:21:56 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!homer.alpha.net!uwm.edu!cs.utexas.edu!www.nntp.primenet.com!nntp.primenet.com!dispatch.news.demon.net!demon!g6iqm.demon.co.uk!g6iqm
From: Michael J Wooding <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Digital Audio/data streams
Date: Sat, 9 Nov 1996 08:59:02 +0000
Organization: VHF Communications Magazine
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References: <EZ6q$[e-mail]>
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In article <EZ6q$[e-mail]>, Steve Simpson
<[e-mail]> writes
>Maybe there is a chip that does the whole thing (audio to data stream
>and back).

Sounds like a cellular phone to me

Mike

--
Michael J Wooding G6IQM     email: [e-mail]
http://www.eolas.co.uk/ag/vhfcomm.htm & http://www.clearlight.com/~vhfcomm
KM Publications, 5 Ware Orchard, Barby, Nr.Rugby, CV23 8UF, UK
Tel: [phone]     Fax: [phone]
VHF Communications Magazine - Especially covering VHF, UHF and Microwaves


From [e-mail] Sat Nov 16 17:21:57 1996
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From: Steve Simpson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Digital Audio/data streams
Date: Mon, 11 Nov 1996 16:46:37 +0000
Organization: Chubby Programming
Lines: 18
Distribution: world
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References: <EZ6q$[e-mail]>
 <[e-mail]>
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In article <[e-mail]>, Michael J Wooding
<[e-mail]> writes
>In article <EZ6q$[e-mail]>, Steve Simpson
><[e-mail]> writes
>>Maybe there is a chip that does the whole thing (audio to data stream
>>and back).
>
>Sounds like a cellular phone to me

Thanks Mike, very constructive!

NEXT!
--
Steve "Chubby" Simpson
Web Author/Night Club D.J.
[e-mail]
G7NAY@GB7MSW.#33.GBR.EU
HTTP://www.chubs.demon.co.uk


From [e-mail] Sat Nov 16 17:21:58 1996
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From: [e-mail] (johan)
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Digital Audio/data streams
Date: Tue, 12 Nov 1996 01:07:41 GMT
Organization: XS4ALL, networking for the masses
Lines: 20
Message-ID: <567j0e$[e-mail]>
References: <EZ6q$[e-mail]>
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Steve Simpson <[e-mail]> wrote:

>I would like to experiment with A/D and D/A audio over radio. I have an
>excellent Babani book on the subject but all the circuits seem to have
>parallel outputs. I would like some sort of modem type chip that will
>take the parallel signal and turn it into a data stream for TX in a
>narrow bandwidth. Also visa versa. Is this cheaply possible using say
>cellular phone type circuits or am I asking the impossible.

>Maybe there is a chip that does the whole thing (audio to data stream
>and back).

>Can anyone point me in the right direction please?

well i have a tp3057 from national semiconductor
it will do the job for you
coding en decoding in 1 ic
check the home page of national semiconductor for datasheets
(btw tp3054 is whith u law coding )



From [e-mail] Sat Nov 16 17:21:58 1996
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From: Michael J Wooding <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Digital Audio/data streams
Date: Tue, 12 Nov 1996 19:24:30 +0000
Organization: VHF Communications Magazine
Lines: 17
Distribution: world
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References: <EZ6q$[e-mail]>
 <[e-mail]> <QQy$[e-mail]>
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In article <QQy$[e-mail]>, Steve Simpson
<[e-mail]> writes
>Thanks Mike, very constructive!
>
>NEXT!

I do try very hard - perhaps though if you had investigated devices as
used in that market you would find what you want?

Mike

--
Michael J Wooding G6IQM     email: [e-mail]
http://www.eolas.co.uk/ag/vhfcomm.htm & http://www.clearlight.com/~vhfcomm
KM Publications, 5 Ware Orchard, Barby, Nr.Rugby, CV23 8UF, UK
Tel: [phone]     Fax: [phone]
VHF Communications Magazine - Especially covering VHF, UHF and Microwaves


From [e-mail] Sat Nov 16 17:22:01 1996
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
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From: [e-mail] (Mark Zenier)
Subject: Re: Digital Audio/data streams
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.homebrew,uk.radio.amateur
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <EZ6q$[e-mail]> <[e-mail]>
Date: Wed, 13 Nov 1996 18:39:03 GMT
Lines: 31
Sender: [e-mail]
Xref: news1.epix.net rec.radio.amateur.homebrew:21109 uk.radio.amateur:22794

in <[e-mail]>, Steve Simpson wrote:
: Thanks Peter, I've downloaded the App notes from the Motorola WWW site
: and I'm well on my way.
: 'Can't help wondering if their is a very fast Hi Fi version though.

I gather that there's an experimental digital audio broadcast system
defined for the VHF audio band in the UK.

You could use the same parts from CD players, but the datastream there
is a minimum of 1.4 MBps.  And I think the stream coming out of a
digital socket on the back of a player so equipped is more than that, as
they output more bits for each sample that the CD actually has along
with some overhead.  Parts used in computer sound cards would also be
worth looking at.

Given that sort of bandwidth requirement, systems designed for over the
air use will use some sort of compression, and reduced sample rates and
sample sizes (compared to CD).

There may be some chips that do NICAM (the digital stereo audio system
used on TV in the UK and other places in Europe).  Try the Philips web
site.  There are decoder chips, but the system uses some sort of block
compression and an encoder would be nontrivial.

Check out some articles over the past 3 or 4 years in Elektor
Electronics.  They've had several on NICAM, and copybit "revisers" for CD
and DAT systems.

Mark Zenier  [e-mail]  [e-mail]




From [e-mail] Sat Nov 16 17:22:02 1996
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From: Steve Simpson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Digital Audio/data streams
Date: Mon, 11 Nov 1996 12:10:28 +0000
Organization: Chubby Programming
Lines: 20
Distribution: world
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References: <EZ6q$[e-mail]>
 <01bbcde5$3417cb00$d9102399@peter-s>
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In article <01bbcde5$3417cb00$d9102399@peter-s>, Peter Gottlieb
<[e-mail]> writes
>Try checking out the Motorola CVSD chip.  It was a while ago, but I thing
>the numbers were
>MC3417 for 3 bit version and MC3418 for 4 bit version.

Thanks Peter, I've downloaded the App notes from the Motorola WWW site
and I'm well on my way.
'Can't help wondering if their is a very fast Hi Fi version though.

Regards and once again thanks for your help.

Steve.

--
Steve "Chubby" Simpson
Web Author/Night Club D.J.
[e-mail]
G7NAY@GB7MSW.#33.GBR.EU
HTTP://www.chubs.demon.co.uk


From [e-mail] Sat Nov 16 17:22:03 1996
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From: woody white <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Diplexers
Date: Sat, 09 Nov 1996 03:41:48 -0800
Organization: http://www.geocities.com/capecanaveral/3722
Lines: 22
Message-ID: <[e-mail]>
References: <01bbcd49$574d21c0$1318a6c2@mazzola>
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If you can find a copy.... Try the book " Solid State Design for the
radio amateur", published by the American Radio Relay League.  It has
about a page devoted to diplexers.  Lots of other good data too.  If
needed, I have a link to the ARRL on my page-
http://www.geocities.com/capecanaveral/3722
Have fun!  Woody

Giovanni Mazzola wrote:
>
> I'm trying to design a diplexer to be connected between the mixer (SBL-1)
> and
> the IF output (29 MHz) of a 6m transverter I'm going to design.
>
> I was looking around for some literature (or software tool, better) about

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Sat Nov 16 17:22:04 1996
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From: "Giovanni Mazzola" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Diplexers
Date: 8 Nov 1996 07:49:16 GMT
Organization: Video On Line
Lines: 19
Message-ID: <01bbcd49$574d21c0$1318a6c2@mazzola>
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I'm trying to design a diplexer to be connected between the mixer (SBL-1)
and
the IF output (29 MHz) of a 6m transverter I'm going to design.

I was looking around for some literature (or software tool, better) about
this
subject, but it seems it isnot a popular matter.

Any help about diplexers ? Please do not confuse it with a "duplexer", a
diplexer being a particular filter that allows passing of a frequency and
closing of all the others to 50 ohms (sorry for a so bad explanation...
HI).

It is a very interesting subject, in my opinion.

Thanks in advance.

Giovanni, IT9XXS
[e-mail]


From [e-mail] Sat Nov 16 17:22:04 1996
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From: "ashlock" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Diplexers
Date: Sat, 9 Nov 1996 00:41:37 -0500
Organization: NetWay By MDC, Inc.
Lines: 33
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The '96 Radio Amateurs Handbook has the best coverage on diplexers that I
have seen. The math isn't too complex for determining component values.

The diplexer presents a fixed resistive load at all frequencies to the
mixer (like 50 ohms - and this is important to proper operation of the
mixer) while passing a limited range of frequencies to the following
stage.

> "Giovanni Mazzola" <[e-mail]> wrote in article
<01bbcd49$574d21c0$1318a6c2@mazzola>...
> I'm trying to design a diplexer to be connected between the mixer
(SBL-1)
> and
> the IF output (29 MHz) of a 6m transverter I'm going to design.
>
> I was looking around for some literature (or software tool, better)
about
> this
> subject, but it seems it isnot a popular matter.
>
> Any help about diplexers ? Please do not confuse it with a "duplexer", a
> diplexer being a particular filter that allows passing of a frequency
and
> closing of all the others to 50 ohms (sorry for a so bad explanation...
> HI).
>
> It is a very interesting subject, in my opinion.
>
> Thanks in advance.
>
> Giovanni, IT9XXS
> [e-mail]
>


From [e-mail] Sat Nov 16 17:22:06 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Diplexers
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <01bbcd49$574d21c0$1318a6c2@mazzola>
Date: Sat, 9 Nov 1996 10:14:30 GMT
Lines: 63

In article <01bbcd49$574d21c0$1318a6c2@mazzola> "Giovanni Mazzola" <it9xxs@exi
t.it> writes:
>I'm trying to design a diplexer to be connected between the mixer (SBL-1)
>and the IF output (29 MHz) of a 6m transverter I'm going to design.
>I was looking around for some literature (or software tool, better) about
>this subject, but it seems it isnot a popular matter.
>
>Any help about diplexers ? Please do not confuse it with a "duplexer", a
>diplexer being a particular filter that allows passing of a frequency and
>closing of all the others to 50 ohms (sorry for a so bad explanation...
>HI).

There are several circuits called diplexers, some of them are actually
duplexers (most of the ones for combining dual band radio signals for
example). What you want is very specific, however. The circuit you need
is a bandpass between the mixer and the post amplifier and a band reject
shunting the mixer to a 50 ohm termination. The desired signal passes
through the BP filter to the post amp while not being able to reach
the termination because of the band reject filter. All other mixer
products are barred from entering the post amp by the BP filter while
being able to reach the termination via the band reject filter.

In other words, unlike a duplexer, this diplexer has both filters tuned
to the same frequency, the IF, but one is a pass and the other is a
stop filter. Here's a drawing.


                     C1     L1
From Mixer----x------||---)))))--------> to post amp
              |
              x---x
              )   |
          L2  )   =  C2
              )   |
              x---x
              |
              /
              \ R1
              /
            __|__
            / / /


C1 and L1 are series resonant at 29 MHz, C2 and L2 are parallel
resonant at 29 MHz. R1 is 50 ohms. You can, of course, use more
complex filters (higher order) in the bandpass and bandstop
sections if you desire, but this simple circuit is usually
sufficient.

Note that you want the bandpass components to have a high reactance
compared to the mixer and post amp termination resistances at frequencies
you don't want passed, IE use a low C resonant circuit. And the bandstop
section should be high C to give a low impedance to signals off the IF
frequency that are heading for the termination.

You can use ARRL Radio Designer to model this network and optimize
the component values.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sat Nov 16 17:22:07 1996
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From: Mandy Wright <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Diplexers
Date: Mon, 11 Nov 1996 00:33:05 +0000
Organization: Radio Services
Lines: 34
Distribution: world
Message-ID: <[e-mail]>
References: <01bbcd49$574d21c0$1318a6c2@mazzola>
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A cheap way to give low VSWR to mixer output: use 6db pad.

Regards
Tim

In article <01bbcd49$574d21c0$1318a6c2@mazzola>, Giovanni Mazzola
<[e-mail]> writes
>I'm trying to design a diplexer to be connected between the mixer (SBL-1)
>and
>the IF output (29 MHz) of a 6m transverter I'm going to design.
>
>I was looking around for some literature (or software tool, better) about
>this
>subject, but it seems it isnot a popular matter.
>
>Any help about diplexers ? Please do not confuse it with a "duplexer", a
>diplexer being a particular filter that allows passing of a frequency and
>closing of all the others to 50 ohms (sorry for a so bad explanation...
>HI).
>
>It is a very interesting subject, in my opinion.
>
>Thanks in advance.
>
>Giovanni, IT9XXS
>[e-mail]

Mandy
(Typing on behalf of my husband Tim who hates computers
despite being a practising RF Engineer!  I know _nothing_ about RF!!)
Sussex
UK                Please note the NEW ADDRESS!

Turnpike evaluation. For Turnpike information, mailto:[e-mail]


From [e-mail] Sat Nov 16 17:22:08 1996
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From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Does RF Parts have web site?
Date: Sat, 16 Nov 1996 16:51:26 GMT
Organization: RST Engineering
Lines: 19
Message-ID: <56kreq$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

Allan Dobler <[e-mail]> shared these priceless pearls of
wisdom:

->Hi, does RF Parts in San Marcos, Ca. have a web site?

I don't know; I searched for an hour the other day and came up dry.  I saw
the owner's picture on the cover of a magazine last week, and it brought to
mind the last time he and I worked together was on the board of directors
of the San Diego VHF Club back in the early '60s.  If you find a site, tell
Merit to drop me a line.

Jim

Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1st phone---Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-A&P-FAA Counselor



From [e-mail] Sat Nov 16 17:22:08 1996
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From: [e-mail] (Steven Kerns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Down East Microwave on the WWW
Date: 7 Nov 1996 04:49:35 GMT
Organization: Penn Biomedical Support, Inc.
Lines: 8
Distribution: world
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If you are interested in VHF/UHF & SHF construction projects
check out Down East Microwave's homepage at:

             http://www.downeastmicrowave.com


73 Steven Kerns N3FTI



From [e-mail] Sat Nov 16 17:22:09 1996
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From: Eric Gagnon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: follow radio signal
Date: Tue, 12 Nov 1996 22:01:04 -0500
Organization: Quebec Telephone
Lines: 22
Message-ID: <[e-mail]>
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I want to make some device able to folow radio signal in 1/4 mile

distance

if the signal is backward the receiver lit LED backward

if the signal is forward the receiver lit LED foward

if the signal is from left lit left LED

and the same for right.

some people know how to make that device.

or where can i find a documentation on this?

Somebody say is a doppler RDF receivers.



Tanks for rapid respond.



From [e-mail] Sat Nov 16 17:22:10 1996
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From: "Charles H. Reichert" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FREE SOFTWARE, CIRCUITS
Date: Sat, 09 Nov 1996 13:21:11 -0600
Organization: American Intermaxx, Inc... IMAXX.NET
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http://www.imaxx.nwt/~kd9jq

Courtesy of KD9JQ


From [e-mail] Sat Nov 16 17:22:11 1996
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From: "Charles H. Reichert" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FREE SOFTWARE, CIRCUITS - Correction
Date: Sun, 10 Nov 1996 10:03:57 -0600
Organization: American Intermaxx, Inc... IMAXX.NET
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Oops...correct address is:

                http://www.imaxx.net/~kd9jq


From [e-mail] Sat Nov 16 17:22:12 1996
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From: "imagine" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Free Web site for Homebrew Project
Date: 9 Nov 1996 13:18:02 GMT
Lines: 8
Message-ID: <01bbce48$cb009200$[e-mail]>
NNTP-Posting-Host: slip166-72-221-142.tx.us.ibm.net
X-Newsreader: Microsoft Internet News 4.70.1155

If you have a interesting homebrew project and need a place to
put some info about it on the web, send it to me and I will
put it on the web for free. I have a homebrew projects on the
web page at
http://www.tecsolv.com/cq

Roger, KI5YN, Tecsolv Econo Page
http://www.tecsolv.com/econo


From [e-mail] Sat Nov 16 17:22:13 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: FS/trade:  Lab-grade test equipment for your next project
Date: 5 Nov 1996 06:33:41 -0800
Organization: Zippo
Lines: 37
Message-ID: <55nj85$[e-mail]>
NNTP-Posting-Host: 199.179.66.155

Please forgive the intrusion of this "FS/Trade" post, but hopefully
it might be of value to someone looking for test equipment for his
homebrewing.

I would consider any amateur gear trades.


The following lab-grade test equipment is manufactured by
LEADER Corporation:

*** Leader LS1020 20 mhz scope

For details, see page 12 of Tuckers latest Test
and Measurement Equipment Catalog.  They sell it new for
$525.  Buy mine used for $175.  20 mhz, 2 channels, very
light.

*** Leader 27A Audio Generator

Covers 10 HZ through 1 Mhz. Sine / Square wave outputs.  $45

*** Leader LSG-16 RF Signal Generator

100 khz - 300 mhz.  1 khz internal modulator.  Also accepts/tests
your crystal for crystal controlled output. $65

Also have Elenco-Precision 0-30 Volt, .5 Amp adjustable power
supply.  Separate voltage and current meters continuously monitor
output.  Current limiter with overload indicator.  $20

No books.  Good condition, but some corporate ID info painted on.
Prices include freight to lower 48 (slightly more west coast /
mountains).

Jeff, Near Detroit
WB5KZW
[phone]


From [e-mail] Sat Nov 16 17:22:14 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 9 Nov 1996 00:45:44 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 17
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Newsreader: AOL Offline Reader

Just curious....
Have seen several references (comments) in the
past concerning imported PA tubes, such as
the Chinese copies of Eimac's 3-500Z.  I have
heard claims that these tubes are more
"prone" to VHF parasitic problems due to
their having a higher gain than the original
Eimacs.
I wonder if this is true. After reading about
the effects of gas release being able to
cause severe internal flashovers in new tubes,
I am now wondering if there is indeed a higher
incident of problems with the imported tubes,  if
it may be caused by contamination and poor
quality control?

Peter


From [e-mail] Sat Nov 16 17:22:15 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.vcnet.com!port23.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 08 Nov 1996 03:59:04 -0700
Organization: Internet Access of Ventura County
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port23.vcnet.com

In article <[e-mail]>,
[e-mail] wrote:

> If I can prove my statement, that the peak tank voltage can exceed the
> supply voltage by significant amounts is correct, ... snip...

The idea that the tank can drive the anode to high voltages is not
logical.  The engine is the amplifier tube.  The tank is the flywheel.

In a previous post, did you claim that the peak anode voltage produced by
a mistuned tank could exceed several times the anode supply voltage?
------------------------------
e-mail copy to Mr. Rauch.

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:17 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sat, 09 Nov 1996 05:23:52 -0700
Organization: Internet Access of Ventura County
Lines: 38
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <01bbce07$2c3cdde0$[e-mail]>
NNTP-Posting-Host: port12.vcnet.com

In article <01bbce07$2c3cdde0$[e-mail]>, "Will, KN6DV"
<[e-mail]> wrote:

> Hello all, I have been following this tread for some time and kind of lost
> track of all the previous comments. ( I think it is a very interesting and
> educational discussion.)

 Loosing track is easy when there's so much smoke in a debate.  When this
debate started, I received an e-mail from a ham in NYC who warned me that
one of the debaters here tends to invent smoke, and use it as a
diversionary tactic.

> So I looked up all the posting on this subject and made 1 combined file.
> I have this file in my home page and this is a unedited file (long). I have
> tried to keep the right tread on it.
>
> Here is the URL  http://www.av.qnet.com/~kn6dv
> and you will see the "Good source for amplifier tips" link.

Good idea, Will.  Thanks.

> 73 Will,  KN6DV
>
> [e-mail]
> --
> http://www.av.qnet.com/~kn6dv
>
> REFORM
> Unless the reformer can invent something which substisutes attractive
> virtues vices, he will fail.
> (Walter Lippmann)

Ç  I think there may be a typo in the Lippmann quote.
--------------------------------
e-mail copy to Will,  KN6DV

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:18 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in1.uu.net!news.vcnet.com!port25.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 08 Nov 1996 17:03:34 -0700
Organization: Internet Access of Ventura County
Lines: 30
Message-ID: <[e-mail]>
References: <55p410$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port25.vcnet.com

In article <[e-mail]>, [e-mail] (J.
Fred Riley) wrote:

> On 8 Nov 1996 05:44:42 GMT, [e-mail] wrote:
> > It sure seems a better solution would be to wind the plate choke
> >with nichrome
> >Placing nichrome in that path, if workable, would also reduce intensity of
> >gas arcs, a "free" additional benefit.
>
> I alwys understood that nichrome wire was the "secret" of the B&W 800
> plate choke.  Wasn't it wound with nichrome?
>
>
> Fred
> [e-mail]
> [e-mail]

 The B & W 800 is wound with copper wire.  Nichrome is inappropriate for
use in a HV-RFC because it is too resistive.  Silicone-varnish (type
WL/200 degrees C), electric motor wire is excellent for use in a HV-RFC .
(for a detailed discussion see *Amplifiers* on my Web site) The URL is
http://www.vcnet.com/measures/
 VHF parasitic oscillations rarely involve the HV-RFC.  The exception is
Henry amplifiers.  However, if you experience a big-bang, and you discover
several crispy-crittered turns of wire near the top of the choke, chances
are that the choke was involved in a VHF oscillation.  Connecting a vhf
attenuator bead in series with the top of the choke usually helps.

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:19 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in2.uu.net!news.qnet.com!usenet
From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 9 Nov 1996 06:27:40 GMT
Organization: KN6DV
Lines: 22
Message-ID: <01bbce07$2c3cdde0$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: lanc01-29.ca.qnet.com
X-Newsreader: Microsoft Internet News 4.70.1155

Hello all, I have been following this tread for some time and kind of lost
track of all the previous comments. ( I think it is a very interesting and
educational discussion.)
So I looked up all the posting on this subject and made 1 combined file.
I have this file in my home page and this is a unedited file (long). I have
tried to keep the right tread on it.

Here is the URL  http://www.av.qnet.com/~kn6dv
and you will see the "Good source for amplifier tips" link.

73 Will,  KN6DV

[e-mail]
--
http://www.av.qnet.com/~kn6dv

REFORM
Unless the reformer can invent something which substisutes attractive
virtues vices, he will fail.
(Walter Lippmann)




From [e-mail] Sat Nov 16 17:22:20 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 9 Nov 1996 17:38:18 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 50
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Newsreader: AOL Offline Reader

Hi Peter,

In article <[e-mail]>,
[e-mail] writes:

>Just curious....
>Have seen several references (comments) in the
>past concerning imported PA tubes, such as
>the Chinese copies of Eimac's 3-500Z.  I have
>heard claims that these tubes are more
>"prone" to VHF parasitic problems due to
>their having a higher gain than the original
>Eimacs.
>I wonder if this is true.

No, not at all. They have less gain than Eimac's 3-500 as a general rule,
but all in all the gain is so close no one would notice.

This is part of the technical damages false claims of parasitics has done.
The Chinese tubes, like all tubes, arc over from gas, not parasitics.

The problem is the Chinese tubes are not pumped down properly, and the
glass to metal seals are not as reliable as they should be. QC is poorer,
and the tubes won't withstand rated operating temperatures.

Out of a batch of 100 Chinese 3-500Z's received to test, 74% arced at 6000
volts or less. 100% had bad anode connector fit, 12% had poor solder
connections in the base.

Of the 26% that marginally passed gas tests, almost 50% failed while
dissipating 500 watts in less than one hour due to seal or envelope
failure. A typical Eimac tube will run years with 500 watts of
dissipation.

>After reading about
>the effects of gas release being able to
>cause severe internal flashovers in new tubes,
>I am now wondering if there is indeed a higher
>incident of problems with the imported tubes,  if
>it may be caused by contamination and poor
>quality control?

It is without a doubt gas or seal failure, yet it is wrongly blamed on
parasitics.

A similar problem happened with 8877's, Eimac had a material problem in
the heat dam causing cathode internal shorts, and people blamed it on
parasitics.

73 Tom


From [e-mail] Sat Nov 16 17:22:21 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.vcnet.com!port12.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sat, 09 Nov 1996 04:41:35 -0700
Organization: Internet Access of Ventura County
Lines: 57
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port12.vcnet.com

In article <[e-mail]>,
[e-mail] wrote:

> Just curious....
> Have seen several references (comments) in the
> past concerning imported PA tubes, such as
> the Chinese copies of Eimac's 3-500Z.  I have
> heard claims that these tubes are more
> "prone" to VHF parasitic problems due to
> their having a higher gain than the original
> Eimacs.

Yes, they do have a higher mu than the Eimac 3-500Z, but the mu is similar
to Amperex 3-500Z .  However, most of the vhf parasitic oscillation
problems I hear about involve Chinese 572Bs, which appear to have much
higher vhf gain than do Cetron and RCA 572Bs.  More gain isn't necessarily
better, unless you are trying to build an oscillator.  Have you ever been
in an auditorium when someone turns up the gain too high on the PA?

> I wonder if this is true. After reading about
> the effects of gas release being able to
> cause severe internal flashovers in new tubes,
> I am now wondering if there is indeed a higher
> incident of problems with the imported tubes,  if
> it may be caused by contamination and poor
> quality control?
>
> Peter
--------------
 At first, the Chinese tubes did have a few problems---some of which were
materials-related.  In time, the problems were worked out
 If internal gas were the culprit, the gas would still be there after a
big bang.  I test tubes which have been removed from such amplifiers.  In
most cases, the vacuums appear to be normal.  For a graphite anode 3-500Z,
a normal vacuum is indicated by a leakage current of 10uA or less at at an
anode-to-grid potential of 9kV.  For a metal anode  3-500Z, the normal
leakage current is 3uA or less at 9kV.

 I also measure grid-to-cathode breakdown voltage (BV).  Due to the bursts
of high grid current that seem to accompany parasitic vhf oscillations,
grid damage is an indication that such oscillations have occured.
 For Instance, normal grid-to-cathode BV for a 3-500Z is about 8kV.  For
3-500Zs that have experienced a big bang, I see reduced voltage
withstanding ability.because the hot filament is bent sideways during the
parasitic. (see photo on p.15 in Sept. 1990 QST).  In some tubes, the BV
is zero volts--i.e.,  the grid is welded to the bent filament helices.  In
other tubes. the BV is reduced by a less severely bent filament.   From my
experiences, a 3-500Z whose grid-to-cathode voltage withstanding ability
is 5kV or less, will probably develop a grid to cathode short when the
tube is operated in an amplifier. Sure, 5kV sounds like plenty of BV, but
when the filament is at it's normal operating temperature of 1800+ degrees
K, it expands in size, reducing the grid clearance.
---------------------------
e-mail copy to Peter

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:23 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!feed1.news.erols.com!uunet!in2.uu.net!lou.teclink.net!usenet
From: "Tom C. Brown, Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Mon, 11 Nov 1996 10:20:56 -0600
Organization: Madison Materials Company
Lines: 39
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tc3_59.teclink.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; U)

Partial quote from Tom's message:

>>You keep referring to a letter that says nothing<<

Tom, what letter have you been reading?  The letter that Rich is
apparently referring to says [in part] "Both have been badly overheated
internally, the apparent result of an oscillation condition."
"Oscillation condition"....."oscillation condition".....hmmm....  Do PA
tubes normally oscillate?  Was he referring to the tubes oscillating at
HF?  The letter says nothing about any probably cause except an
"oscillation condition".  That letter does NOT say "nothing".

Also, the letter from Mr. Foote is *signed*, and we all know exactly who
wrote it.  Unfortunately, we cannot say the same for the unsigned email
that you posted.  Unless someone at Eimac has the username "XXX", then
the true identity of the sender must have been intentionally hidden at
some point.  Why won't you tell us who wrote it?  Is the author of the
email that you quoted afraid to take responsibility for what he said?
It looks like it at this point......  Which makes the accuracy of said
email highly suspect.  And, as I see it, the whole case against Mr.
Foote's credibility *is* that email.

Now, as I have said before via email.....you guys are the experts here.
I'm just watching and picking up lots of great info from the
discussion.

But....  I really think you are throwing rocks from the porch of a glass
house on this "unnamed source" issue.

I would recommend that you either name the *person* who wrote the
"damning email" from Eimac or stop questioning Mr. Foote's credibility.
One of the two would seem to be indicated at this point.

And thanks again for the continuing discussion......the info being
batted around here is indeed extremely interesting!

73

Tom KJ5IE


From [e-mail] Sat Nov 16 17:22:24 1996
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From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 11 Nov 1996 13:37:02 GMT
Organization: Netcom
Lines: 43
Message-ID: <567a5u$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pax-ca25-53.ix.netcom.com
X-NETCOM-Date: Mon Nov 11  7:37:02 AM CST 1996

In <[e-mail]> [e-mail]
writes:
>
>
>When exactly matched (in step) with the tube's time varying
>resistance, the time varying voltage and current at the anode forms
>the equivalent of a source resistance. This is a non-dissipative
>resistance that represents the source resistance of the dc to RF
>conversion process. This is the resistance value conjugately matched
>when maximum energy conversion efficiency is desired, or maximum
>output under a given set of operating parameters. It can be found by a
>modified Fourier analysis called a Chaffee analysis (Review Science
>Inst. 7, October 1936). This is also a resistance very few people
>understand, and one that got Walt Maxwell discredited for saying what
>was absolutely correct.

Hi Tom,

    My understanding of Chaffee analysis is that the resistance
calculated is the *load* resistance, not the source resistance.  In
fact, nothing is known of the source resistance (except that, in the
example of a Class C amp, it is non-linear and time-varying), so how
can we say there is a conjugate match?

    I think this is my main hangup with the idea of "conjugate
matching" to a non-linear amp such as a class C amp.  The final
(glowfet, fet, or bjt), is a non-linear time-varying resistance
(picture a fet alternately pinched-off then wide-open - essentially a
switch).  How does one conjugately match a linear resistance load to a
non-linear device?  Does such a concept make sense?

    Nothing I've read of Chaffee analysis says anything about the
source resistance.  The final is modeled as a non-linear current source
(with *no* resistance (or, more properly, infinite resistance)).  And
that's it.  Calculate the load resistance necessary to give the desired
voltage swing, and away you go...

Regards,

- Jeff, WA6AHL

P.S.  Would it be possible to get a copy of Chaffee's original article.
I've always wanted to read it, but I've never found it.


From [e-mail] Sat Nov 16 17:22:25 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in1.uu.net!news.qnet.com!usenet
From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Good source for amplifier tips
Date: 12 Nov 1996 06:31:37 GMT
Organization: KN6DV
Lines: 12
Message-ID: <01bbd063$16e3fb00$[e-mail]>
NNTP-Posting-Host: lanc00-28.ca.qnet.com
X-Newsreader: Microsoft Internet News 4.70.1155

For those who are wondering what the  "EIMAC" letter is all about, you will
find a copy of it on the page:
--
http://www.av.qnet.com/~kn6dv

Also you will find the archive of the "Good source for amplifier tips".

REFORM
Unless the reformer can invent something which substisutes attractive
virtues for atractive vices, he will fail.
(Walter Lippmann)



From [e-mail] Sat Nov 16 17:22:27 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in2.uu.net!news.vcnet.com!port21.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Mon, 11 Nov 1996 23:47:44 -0700
Organization: Internet Access of Ventura County
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]> <55iuf7$[e-mail]>
NNTP-Posting-Host: port21.vcnet.com

In article <55iuf7$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:
snip
> At 150 mA of grid current in a typical HF PA, a single 3CX800 has a
> measured grid dissipation of almost 20 watts. That's almost 5 times the
> maximum rated dissipation of the grid.

According to Eimac CURVE 005211, "Eimac 3CX800A7 Constant Current
Characteristics (Grounded Grid)":
 around 27vrms of cathode-to-grid driving voltage produces the maximum
anode/plate current of 600mA.

P=I times E.   27vrms times 150mA = 4.05w(rms).

Tom:  Is 4.05w "almost 20 watts" in your opinion?

Tom: If the rated grid dissipation is 4w, in your opinion is 4.05w of grid
dissipation going to  increase the temperature of the grid to over 2000
degrees F, and boil the gold plating off of the grid?

> And yes, it will cause the gold to ball up, evaporate and even flake off.
> And yes, Eimac will confirm this.
>
When are you going to publish this confirmation from Eimac that supports
your position, Mr. Rauch?
--
 Tom does not appear to understand what is taking place.  Gold melt balls
are formed from gold vapour.    I have never seen evidence of gold flaking
off the grid in a kaput tube I opened and inspected.
-------------------------
e-mail copy to Mr. C.  Tom Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:28 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!news.vcnet.com!port28.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Tue, 12 Nov 1996 08:29:09 -0700
Organization: Internet Access of Ventura County
Lines: 34
Message-ID: <[e-mail]>
References: <55g2ip$[e-mail]> <55iuf8$[e-mail]>
NNTP-Posting-Host: port28.vcnet.com

In article <55iuf8$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:
snip...

> Subj:   3CX800A7
> Date:   96-10-31 13:21:43 EST
> From:   [e-mail]
> To:     [e-mail]
>
> Hi, Tom. I hear you are in conversation with Rich Measures.
> To answer your question regarding the 3CX800A7, this tube uses a grid made
> from material which has a high melting point (Molybdenum or Tungsten)
> plated with gold.  If one over drives this tube or operates it at high
> grid current due to improper loading or failure in the matching network or
> load, then it is likely that the temperature of the grid will quickly,
> within seconds, become high enough to vaporize the gold.  This may be what
> happened to the 8874 tubes that Measures returned to Eimac a long time
> back and Bill Foote, then responsible for writing letters related to
> returned products, wrote something about a microwave oscillation that we
> saw IN ANOTHER PRODUCT, maybe he did not make that distinction, but to
> this day Measures believes that the incidence of failures with gold
> evaporated from grids are entirely due to parasitic oscillations, and
> tries to hold this letter from Mr. Foote as evidence.  This is bunk. I
> trust that is what you are discussing with Measures?  May I suggest that
> you make your life more enjoyable, do something else than arguing with
> Measures.
>
>
> ------...

Tom:  Who is Mr. XXX?

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:29 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.dgsys.com!news.dgsys.com!news.getnet.com!news.good.net!news.good.net!news.id.net!news.dra.com!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!audrey01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 7 Nov 1996 04:34:59 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 49
Sender: [e-mail]
Message-ID: <55sag3$[e-mail]>
References: <55p410$[e-mail]>
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X-Newsreader: AOL Offline Reader

In article <55p410$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>This is a triumph of supposition over science since I've not measured
>any of my amplifiers to see just what the value is.  I'm just
>extrapolating from what I've seen in large HF amplifiers.  When we
>don't use vacuum variables (where it's easier to control the lead
>inductance) the net series reactance of the tuning capacitor
>connection can be quite high at VHF.
>
>
>Fred

The bulk of the reactance has to be in the suppressor with its' shunt
resistance, unless the designer used some long leads.

Even so the contention was the capacitor arced from parasitics, but that
is impossible with it's low reactance and the values in the PA I measured.

The AL-80B is in the low hundreds of ohms and is slightly capacitive at
the anode at 175 MHz, and drops to zero J at 127MHz and again at 110 MHz
where the resistor in the suppressor dominates. Below 80 MHz the tank C
postion starts to have a major effect.

The transmission loss through the tube (measured on a Wiltron Network
analyzer) is minimum at 81.05 (-70 dB), and maximum at 156.21 MHz (-24.2
dB), it dips again at 243.83 MHz to -28.9 dB.

Removing all suppression I can't get this particular PA to oscillate,
probably because it has a new socket design that grounds each grid pin
directly to a foil shield with zero length. The older PA's with ceramic
sockets oscillated about 100 -120 MHz if the suppressor was removed.

In any event, if the impedance was as high as assumed the nichrome woul
have no effect either unless it was a large fraction of a wavelength long!
With high series reactance, the nichrome path would be an open circuit,
and the distributed resistance would have no effect. There would be little
current and almost no I^2 R loss.

So if the conventional suppression didn't work, neither would the
nichrome.

Things aren't as bleak as described, as anyone with a RF Network analyzer,
an RF Impedance Analyzer, or even a lowly MHF-259 can view. If they were,
the amplifier would have more problems than suppression, it would have
horrid VHF TVI. You can bet harmonic or parasitic radiation from the anode
would get out !!!

73 Tom


From [e-mail] Sat Nov 16 17:22:30 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 13 Nov 1996 13:22:26 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 19
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, "Tom C. Brown, Jr."
<[e-mail]> writes:


>At this point, you and Rich disagree, and
>Mr. Foote and Mr. Brandon disagree.  That's a stalemate.  No more, no
>less.

Mr. Brandon represented Varian's viewpoint, not his own. He is the
authorized interface between engineering and customers.  Mr. Measures,
despite his claims, is not their "messenger".

If you have a specific technical question about some technical point you
didn't follow, ask it. I'd be happy to answer and/or site references.

I have no time to argue emotional decisions or techno-religion. This is
science, not voo-doo.

73, Tom


From [e-mail] Sat Nov 16 17:22:31 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.silcom.com!news.west.net!measures
From: [e-mail] (R.L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 14 Nov 1996 04:45:33 -0700
Organization: WestNet
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: term1-30.vta.west.net
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X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <[e-mail]>, [e-mail] wrote:

> Partial quote from Tom's message:
>
> >>You keep referring to a letter that says nothing<<
>
> Tom, what letter have you been reading?  The letter that Rich is
> apparently referring to says [in part] "Both have been badly overheated
> internally, the apparent result of an oscillation condition."
> "Oscillation condition"....."oscillation condition".....hmmm....  Do PA
> tubes normally oscillate?  Was he referring to the tubes oscillating at
> HF?  The letter says nothing about any probably cause except an
> "oscillation condition".  That letter does NOT say "nothing".
>
> Also, the letter from Mr. Foote is *signed*, and we all know exactly who
> wrote it.  Unfortunately, we cannot say the same for the unsigned email
> that you posted.  Unless someone at Eimac has the username "XXX", then
> the true identity of the sender must have been intentionally hidden at
> some point.  Why won't you tell us who wrote it?  Is the author of the
> email that you quoted afraid to take responsibility for what he said?
> It looks like it at this point......  Which makes the accuracy of said
> email highly suspect.  And, as I see it, the whole case against Mr.
> Foote's credibility *is* that email.
>
Yes indeed.  It seems a bit curious that the official Eimac letter from the
anonymous mister XXX has a BOGUS e-mail address.

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:33 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 14 Nov 1996 02:27:18 -0700
Organization: Internet Access of Ventura County
Lines: 31
Message-ID: <[e-mail]>
References: <[e-mail]> <55ka2a$[e-mail]>
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X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <55ka2a$[e-mail]>, [e-mail] (W8JI  Tom) wrot
e:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
>
> >
> > I do not deserve credit for the vhf-uhf-parasitic/gold-sputtering
> >theory.  It originated at Eimac.   I am only the messenger.
>
> Hi Rich,
>
> Eimac claims you are mistaken, and have distorted a letter written by
> someone assigned to answer customer service letters. Anyone with a first
> year physics book can see how unplausable that theory is, and Eimac even
> states the damage is excessive grid current caused, and the only case of
> that they had was in very large transmitting tubes for UHF, and the
> oscillation was microwave heating of the grid.
>
> If we can move beyond that, snip......

I can not move beyond that until I see an official letter from Eimac that
makes this claim.

You said  "...only case of
> that they had was in very large transmitting tubes for UHF".
Tom:  Was this case in a triode power-grid amplifier tube?
---------------------------------
e-mail copy to Mr. Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:35 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in2.uu.net!lou.teclink.net!usenet
From: "Tom C. Brown, Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 13 Nov 1996 17:16:29 -0600
Organization: Madison Materials Company
Lines: 35
Message-ID: <[e-mail]>
References: <01bbd063$16e3fb00$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tc4_35.teclink.net
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X-Mailer: Mozilla 3.0 (Win95; U)

>>No. Since you obviously don't understand the dynamics of a PA, the
dissipation is not 4.05 watts either!<<

Tom, it was you who said that the grid dissipation was "about 4 watts".
Not Rich.

Read back through your own postings and you will see that I am right
about that.

Were you wrong then, or are you wrong now?  Or is the cat both alive
*and* dead?  :-)

>>They go on to say your grid
circuit suggestions are "ludicrous" (that description also seems to fit
your suggestions that photons destroy tubes in PA's that are on
standby),
and that they have yet to see evidence of the parasitic oscillation
damage
claims you make.<<

They, they, they.....   WHO are "they"?  So far, I have seen one, yes
*one* individual at Eimac named here (by you).  No more.  Your use of
the term "they" indicates more than one.  Please supply the names of the
rest of "they".  Or stop saying "they".

As I said before, you and Rich are "1 to 1" in named sources so far.
Why won't you tell us your sources' names?  (Other than Mr. Brandon)

I'm not saying that anything you have said is wrong, but you do seem to
be keeping a smoke screen between us and the identities of your
sources......   And where there is smoke.....   ;-)

73 and thanks again for the great discussion!

Tom KJ5IE


From [e-mail] Sat Nov 16 17:22:36 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 14 Nov 1996 04:23:31 -0700
Organization: Internet Access of Ventura County
Lines: 45
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <[e-mail]>, [e-mail]
wrote:

> In article <[e-mail]>, "Tom C. Brown, Jr."
> <[e-mail]> writes:
>
> >Tom, what letter have you been reading?  The letter that Rich is
> >apparently referring to says [in part] "Both have been badly overheated
> >internally, the apparent result of an oscillation condition."
> >"Oscillation condition"....."oscillation condition".....hmmm....  Do PA
> >tubes normally oscillate?  Was he referring to the tubes oscillating at
> >HF?  The letter says nothing about any probably cause except an
> >"oscillation condition".  That letter does NOT say "nothing".
>
> The letter is pretty clear Tom. It mentions Rich wrote an  interesting
> letter about parasitics. It says his tubes were overheated, the "apparent
> result" of an oscillation condtion.
>
ÇÇ  RE: the "Interesting Letter" Mr. Foote refers to:

Along with the two, kaput tubes he asked me to send him,  Mr. Foote
requested that I note any anomalies in the amplifier.  One of the more
curious things I found was in the MLA-2500's VHF parasitic suppressors.  I
would have missed this if it hadn't been for an old-timer named  'Digger',
W7MOI (RIP).  Digger told me that he had seen parasitic suppressor
resistors that looked perfect on the outside, but were damaged on the
inside.  Sure enough, the 100 ohm suppressor resistors were pristine on the
outside, but their measured resistance had increased to roughly 400 ohms.

 I had seen many  carbon-comp resistors that became out of tolerance.  The
outside of such resistors typically showed signs of overheating, such a
bubbling and/or cracks in the molded case, along with discolouration of the
marking bands.  In my opinion, something pretty strange must have happened
to the suppressor resistors.  Whatever it was, it must have been Potent and
it must have been Quick.  Since the suppressor resistors were paralleled
with an inductance of less than 0.1 microHenry, which was made out of
copper bus wire, it SHOULD have been pretty obvious that a DC arc or 3-30
MHz AC was not involved in damaging the resistors.  When Mr. Foote told me
about the oscillation condition that had been responsible for
gold-sputtering damage to 8877s, the lights finally came on.
-------------------------------
e-mail copy to Mr. Rauch.

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Sat Nov 16 17:22:37 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!data.ramona.vix.com!news1.digital.com!decwrl!pagesat.net!news.qnet.com!usenet
From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Good source for amplifier tips (part2)
Date: 11 Nov 1996 15:30:14 GMT
Organization: KN6DV
Lines: 16
Message-ID: <01bbcfe5$3af4c200$[e-mail]>
NNTP-Posting-Host: lanc00-18.ca.qnet.com
X-Newsreader: Microsoft Internet News 4.70.1155

Part 2 is now available on my page:
--
http://www.av.qnet.com/~kn6dv

It looks like there is a lot of interest in this archive.

73 de Will

[e-mail]


REFORM
Unless the reformer can invent something which substisutes attractive
virtues vices, he will fail.
(Walter Lippmann)



From [e-mail] Sat Nov 16 17:22:38 1996
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From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips (part2)
Date: 11 Nov 1996 15:41:10 GMT
Organization: KN6DV
Lines: 25
Message-ID: <01bbcfe6$c20425a0$[e-mail]>
References: <01bbcfe5$3af4c200$[e-mail]>
NNTP-Posting-Host: lanc00-18.ca.qnet.com
X-Newsreader: Microsoft Internet News 4.70.1155


Sorry about that,I have the right signature file now.

Will, KN6DV <[e-mail]> wrote in article
<01bbcfe5$3af4c200$[e-mail]>...
> Part 2 is now available on my page:
> --
> http://www.av.qnet.com/~kn6dv
>
> It looks like there is a lot of interest in this archive.
>
> 73 de Will
>
> [e-mail]
>
>

--
http://www.av.qnet.com/~kn6dv

REFORM
Unless the reformer can invent something which substisutes attractive
virtues for atractive vices, he will fail.
(Walter Lippmann)



From [e-mail] Sat Nov 16 17:22:39 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in3.uu.net!news.qnet.com!usenet
From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Good source for amplifier tips (part3)
Date: 13 Nov 1996 04:20:50 GMT
Organization: KN6DV
Lines: 13
Message-ID: <01bbd11a$01501140$[e-mail]>
NNTP-Posting-Host: lanc03-16.ca.qnet.com
X-Newsreader: Microsoft Internet News 4.70.1155

For those who are interested, I uploaded part 3 of the on going Good source
for amplifier tips.

You also find the " EIMAC letter " here:

http://www.av.qnet.com/~kn6dv
[e-mail]

REFORM
Unless the reformer can invent something which substisutes attractive
virtues for atractive vices, he will fail.
(Walter Lippmann)



From [e-mail] Sat Nov 16 17:22:40 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in1.uu.net!ott.istar!istar.net!tor.istar!east.istar!news.cancom.net!usenet
From: "Rob Prosper" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Great Big 833a
Date: 14 Nov 1996 00:04:39 GMT
Organization: Cancom's ION -- Internet Outpost Network.
Lines: 10
Message-ID: <01bbd1c0$3cc9ba40$[e-mail]>
NNTP-Posting-Host: ts-fortsim-p5.cancom.net
X-Newsreader: Microsoft Internet News 4.70.1155

I just found a few NOS 833a tubes hiding on a shelf.  Hard to believe
things this big could be hid.

I have checked all kinds of tube sale lists and have yet to find any to
give me an idea of their value.  Any assistance in determining an
appropriate selling value would be appreciated.

Thanks,

Rob


From [e-mail] Sat Nov 16 17:22:41 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!dispatch.news.demon.net!demon!xara.net!emerald.xara.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Help on transistor id
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <5605fj$[e-mail]>
Date: Sat, 9 Nov 1996 12:05:33 GMT
Lines: 26

In article <5605fj$[e-mail]> [e-mail] writes:
>
>Finaly, is there a simple test I can make with a DVM (as for bipolar
>transistors) to check it, that it is nor short or open.

You can check an enhancement mode FET by connecting the DVM leads
to source and drain (observe polarity), and then connect the gate to
the drain with a resistor. If the transistor is good it will start to
conduct. Note, with a DVM you may have to use the diode test position
to get enough voltage to activate the transistor. With an older VOM,
just use a low ohms scale. This is a simple go/no-go functional test
that'll work on NPN bipolar transistors too.

Note the bit about observing polarity. With many meters on ohms
scale, the red probe outputs a negative voltage, not positive as
you might assume. Check your meter (with another meter naturally)
to determine if this is true for your meter. Then *write it down*
on a tag and attach it to the meter. This will save lots of frustration
later on when you're checking transistors.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sat Nov 16 17:22:42 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!news.total.net!news
From: [e-mail] (H. Caron)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help on transistor id
Date: Mon, 11 Nov 1996 22:31:36 GMT
Organization: Infobahn Online Services, Montreal, CANADA [phone]
Lines: 25
Message-ID: <568qre$[e-mail]>
References: <5605fj$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ppp-0313.infobahnos.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Gary Coffman) wrote:

>>Finaly, is there a simple test I can make with a DVM (as for bipolar
>>transistors) to check it, that it is nor short or open.

>You can check an enhancement mode FET by connecting the DVM leads

>This is a simple go/no-go functional test
>that'll work on NPN bipolar transistors too.

Realy tought it was more involving :)

>Note the bit about observing polarity. With many meters on ohms
>scale, the red probe outputs a negative voltage, not positive as
>you might assume. Check your meter (with another meter naturally)
>to determine if this is true for your meter. Then *write it down*
>on a tag and attach it to the meter. This will save lots of frustration
>later on when you're checking transistors.

Altough I 'kinda' knew about this, I would have totaly forgotten about
it, this time around. Thanks for the warning.

H.C.




From [e-mail] Sat Nov 16 17:22:42 1996
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From: "John B. Lawrence" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HELP: Keenwood TH-21AT
Date: Sat, 09 Nov 1996 20:50:22 -0800
Organization: Pacific Bell Internet Services
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <550q0o$[e-mail]>
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X-Mailer: Mozilla 2.01E-PBXE  (Win16; I)

Is the repeater offset adjustable on this transceiver? I don't have a
service manual for it. I plan on using it with a Ten Tec 6m transverter,
but I need a 500khz offset rather than the 600khz the Kenwood provides.
Thanks for any help.

Email on this subject is greatly appreciated as I don't have a local
access number to my provider and must dial long distancer.

John B. Lawrence KE6TGN
[e-mail]


From [e-mail] Sat Nov 16 17:22:43 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!vixen.cso.uiuc.edu!uwm.edu!news.he.net!news.good.net!news.good.net!news.onramp.net!usenet
From: Clif <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP: Keenwood TH-21AT
Date: Tue, 12 Nov 1996 12:32:12 -0600
Organization: OnRamp Technologies; ISP;  Dallas/Ft Worth/Houston, TX USA
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <550q0o$[e-mail]> <[e-mail]>
NNTP-Posting-Host: lbj65.onramp.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.01 (Win95; I)
To: "John B. Lawrence" <[e-mail]>

John B. Lawrence wrote:
>
> Is the repeater offset adjustable on this transceiver? I don't have a
> service manual for it. I plan on using it with a Ten Tec 6m transverter,
> but I need a 500khz offset rather than the 600khz the Kenwood provides.
> Thanks for any help.
>
> Email on this subject is greatly appreciated as I don't have a local
> access number to my provider and must dial long distancer.
>
> John B. Lawrence KE6TGN
> [e-mail]

The offset is crystal controlled. it probably could be changed by
substituting the proper crystals.

Clif


From [e-mail] Sat Nov 16 17:22:44 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!news
From: Dave Maciorowski <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: HELP:TNC Radio interfacing
Date: Fri, 15 Nov 1996 08:38:01 -0700
Organization: Netcom
Lines: 26
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: den-co11-22.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Fri Nov 15  9:38:23 AM CST 1996
X-Mailer: Mozilla 2.01 (Win16; I)
Xref: news1.epix.net rec.radio.amateur.digital.misc:20093 rec.radio.amateur.homebrew:21108

Gabe Nemeth wrote:
>
> Hi, and thanks for reading;
> I'm interested in information (Books, Web Pages, etc) that detail
> to any degree the interfacing of 9k6bps TNCs to FM radios. Does
> anyone have or know of a source of this type of information?
> Perhaph there is a circuit cookbook showing how it is all done.
> Gabe Nemeth VE3SLJ. <[e-mail]>

Mike's Curtis's 9600 Baud Packet Handbook is a good place to start.
Get it from ftp://ftp.tapr.org/tapr/general/9600baud/96man2x0.txt

In general, crystaled radios and synthesized all-mode radios work the
best.  Most of the other synthesized FM radios work, but not very well.
They may say "data ready", but they're not.

Many of us are using either TEKK radios or surplus commercial radios,
eg. Motorola Micor or Mitrek.  Mod instructions for these are available.

-----
Dave Maciorowski, WA1JHK
Colorado Repeater Association, Inc.
  Serving Colorado with Voice and Data, 6-Meters to 1.2 Gig

Internet: [e-mail] or [e-mail]
CRA:      http://www.rmsd.com/hamradio/cra/


From [e-mail] Sat Nov 16 17:22:45 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!news.wwa.com!news.ucdavis.edu!indigo!mays
From: mays@indigo (Skip May)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: HELP:TNC Radio interfacing
Followup-To: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Date: 15 Nov 1996 00:28:12 GMT
Organization: University of California, Davis
Lines: 16
Message-ID: <56gdes$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: indigo.ucdavis.edu
X-Newsreader: TIN [version 1.2 PL2]
Xref: news1.epix.net rec.radio.amateur.digital.misc:20094 rec.radio.amateur.homebrew:21113

Contact TAPR (Tuson Amateur Packet Radio), they have a web page. Their
one of the ones who started all the packet mess and they have projects
and information avail for 9600 packet.

73's
Skip May   WV6F
[e-mail]


Gabe Nemeth ([e-mail]) wrote:
: Hi, and thanks for reading;
: I'm interested in information (Books, Web Pages, etc) that detail
: to any degree the interfacing of 9k6bps TNCs to FM radios. Does
: anyone have or know of a source of this type of information?
: Perhaph there is a circuit cookbook showing how it is all done.
: Gabe Nemeth VE3SLJ. <[e-mail]>


From [e-mail] Sat Nov 16 17:22:46 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.tamu.edu!news.utdallas.edu!nrchh45.rich.nt.com!bcarh189.bnr.ca!bmerhc5e.bnr.ca!bcrkh13.bnr.ca!news
From: Gabe Nemeth <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: HELP:TNC Radio interfacing
Date: Thu, 14 Nov 1996 08:22:14 -0500
Organization: Bell Northern Research
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: ntorh010.bnr.ca
Mime-Version: 1.0
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Xref: news1.epix.net rec.radio.amateur.digital.misc:20107 rec.radio.amateur.homebrew:21125

Hi, and thanks for reading;
I'm interested in information (Books, Web Pages, etc) that detail
to any degree the interfacing of 9k6bps TNCs to FM radios. Does
anyone have or know of a source of this type of information?
Perhaph there is a circuit cookbook showing how it is all done.
Gabe Nemeth VE3SLJ. <[e-mail]>


From [e-mail] Sat Nov 16 17:22:47 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!minyos.its.rmit.EDU.AU!not-for-mail
From: [e-mail] (David Peter Cureton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to reduce power?
Date: 10 Nov 1996 04:41:26 GMT
Organization: Royal Melbourne Institute of Technology, Melbourne, Australia.
Lines: 19
Message-ID: <563mdm$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: minyos.its.rmit.edu.au
NNTP-Posting-User: cureton
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]

Grady Russell ([e-mail]) wrote:
:
: Perhaps one of you homebrewers can assist me...how can I reduce the power
: of my radio? Is there something I can place between my mobile and coax?
: I'd like something that wouldn't modify the radio and could easily be
: turned on and off to avoid overloading an amp. Can anyone assist with
: this?
:
: TIA,
: Grady
How about an attenuator? Yeh - that might be the shot!

I assume the mobile is a phone that tx's uder 3 watts. An attenuator
(Variable) should be fairly easy to construct. Have a look at the ARRL
handbook!

 --
David Cureton
[e-mail]


From [e-mail] Sat Nov 16 17:22:48 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!netnews.worldnet.att.net!newsadm
From: woody white <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to reduce power?
Date: Sun, 10 Nov 1996 05:32:08 -0800
Organization: http://www.geocities.com/capecanaveral/3722
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]> <563mdm$[e-mail]>
NNTP-Posting-Host: 207.146.143.102
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01E (Win16; I)

David Peter Cureton wrote:
>
> Grady Russell ([e-mail]) wrote:
> :
> : Perhaps one of you homebrewers can assist me...how can I reduce the power
 An attenuator
> (Variable) should be fairly easy to construct. Have a look at the ARRL
> handbook!
>
>  --
> David Cureton
> [e-mail]

Remember to put it in the Tx line only or it will also attn. any Rx
signal...  (Pardon me for stating the obvious)
--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Sat Nov 16 17:22:50 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: How to reduce power?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sat, 9 Nov 1996 11:48:28 GMT
Lines: 37

In article <[e-mail]>
 [e-mail] (Grady Russell) writes:
>
>Perhaps one of you homebrewers can assist me...how can I reduce the power
>of my radio? Is there something I can place between my mobile and coax?
>I'd like something that wouldn't modify the radio and could easily be
>turned on and off to avoid overloading an amp. Can anyone assist with
>this?

What kind of radio, and what kind of amp?

You can use a power attenuator pad between the radio and the
amplifier, but you'll have to arrange switching to switch it
in and out of the circuit as you go from transmit to receive
so that it won't attenuate received signals too. This can be
a major pain. It's usually better to put the attenuator in
the amplifier, so the switching that is already in there can
take care of getting it in and out of circuit.

If your radio is a typical SSB radio, it will have an ALC
control line. If you feed a DC signal into that line, you
can reduce the radio's RF gain, and hence its output power.
A 9 volt battery and a pot will usually do it. Of course
you can also just turn the mic gain down since the output
of a SSB radio is a function of the amplitude of the modulating
audio. (If you have a speech compressor, turn it off.)

If you have a FM radio, that won't work. Many FM radios have
an internal output power adjustment, however. You can turn
the power down with this. This isn't really a modification of
the radio, just an adjustment.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sat Nov 16 17:22:51 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!news.total.net!annex3-quebec-ppp-16.accent.net!user
From: [e-mail] (Jacques Bellemare)
Newsgroups: rec.radio.amateur.homebrew
Subject: HR2510
Date: Tue, 12 Nov 1996 10:07:20 -0500
Organization: none
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: annex3-quebec-ppp-16.accent.net

looking for information on HR2510 finals and substitutes.

Thanks

JB


From [e-mail] Sat Nov 16 17:22:52 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!dimensional.com!news.wizard.com !news.ici.net!pmfr3ip20.ici.net!user
From: [e-mail] (Bruce KD1MW)
Newsgroups: rec.radio.amateur.homebrew
Subject: HV DIODES FS
Date: 9 Nov 1996 23:36:42 GMT
Organization: The Internet Connection
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: pmfr3ip20

UNITRODE (86-526) 60KV solid state diodes .1 amp
UNITRODE (86-525) 45KV solid state diodes .3 amp
$10 each shipped to lower 48.
Thanks, BRUCE/ KD1MW.


From [e-mail] Sat Nov 16 17:22:52 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Hybrids Information / Video Preenphasis
Date: 14 Nov 1996 09:42:06 -0800
Organization: BEST Internet Communications
Lines: 25
Message-ID: <56flle$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <[e-mail]>,
Marcus Ramos <[e-mail]> wrote:

snip....

>Other subject: I did a video amplifier to an 10.25GHz Gunnplexer,
>and added pre-emphasis to it. With some Jerrold TVRO satellite
>receiver, worked fine, "almost" flat from 15KHz to 4.5MHz.
>But I want to be shure about the correct values for a 525 line
>pre-emphasis (the CCIR values). I don't want to have as a stan
>dard the Jerrold de-emphasis circuit.
>
>Any help? Thanks in advance es Best Regards.
>
>Marcus Ramos, PY3CRX
>[e-mail]
>

The ARRL handbooks of the late 80's has the proper values for
the CCIR 525 line pre-emphasis network in the Fast Scan TV
(FMTV) section.

Steve Muther WF6R




From [e-mail] Sat Nov 16 17:22:54 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!howland.erols.net!nntp.crl.com!news.titan.com!usenet
From: [e-mail] (Bill Bennett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Hybrids Information / Video Preenphasis
Date: Fri, 15 Nov 1996 18:47:32 GMT
Organization: Titan Information Systems
Lines: 38
Message-ID: <56ids5$[e-mail]>
References: <[e-mail]> <56flle$[e-mail]>
NNTP-Posting-Host: moe.bc.tisc.titan.com
X-Newsreader: Forte Free Agent 1.0.82

>In article <[e-mail]>,
>Marcus Ramos <[e-mail]> wrote:

>snip....

>>Other subject: I did a video amplifier to an 10.25GHz Gunnplexer,
>>and added pre-emphasis to it. With some Jerrold TVRO satellite
>>receiver, worked fine, "almost" flat from 15KHz to 4.5MHz.
>>But I want to be shure about the correct values for a 525 line
>>pre-emphasis (the CCIR values). I don't want to have as a stan
>>dard the Jerrold de-emphasis circuit.
>>
>>Any help? Thanks in advance es Best Regards.
>>
>>Marcus Ramos, PY3CRX
>>[e-mail]
>>

525 line pre-emphasis

75 ohm source----|-------274 ohm-----|-------------|
                           |-------3085pf--------|     75 ohm
                           |                          |     termimaton
                           |                          |             |
                        75ohm              75ohm    Ground
                           |                          |
                           ---------------------------
                                         |
                                         |
                                     18.7ohm
                                         |
                                    17.35uh
                                         |
                                    Ground
I have the 625 line if you need it!
Bill
Kc6yox



From [e-mail] Sat Nov 16 17:22:55 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!vixen.cso.uiuc.edu!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Marcus Ramos)
Newsgroups: rec.radio.amateur.homebrew
Subject: Hybrids Information / Video Preenphasis
Date: 14 Nov 96 14:42:49 GMT
Organization: ucsd usenet gateway
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I got two hybrids, one of them from an "crashed" trunk radio.
This is the SHW5042. I tried at the design-net site(Motorola)
but there's not any reference to this parts. Some catalogs
I have don't mention it too. May be MHW5042? The only
"empiric" information I got was some package info, since
in one Motorola books there's some items with such pin
arrange.
The other one is the PF0031, ordered at RF Parts. Unfortuna-
tely I receive the printed data to the PF0310 (it's a VHF devi-
ce).
Other subject: I did a video amplifier to an 10.25GHz Gunnplexer,
and added pre-emphasis to it. With some Jerrold TVRO satellite
receiver, worked fine, "almost" flat from 15KHz to 4.5MHz.
But I want to be shure about the correct values for a 525 line
pre-emphasis (the CCIR values). I don't want to have as a stan
dard the Jerrold de-emphasis circuit.

Any help? Thanks in advance es Best Regards.

Marcus Ramos, PY3CRX
[e-mail]



From [e-mail] Sat Nov 16 17:22:56 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!news3.cac.psu.edu!news.math.psu.edu!ra.nrl.navy.mil!not-for-mail
From: Bill Harwood <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: info on 1.2 gig pre amp 20 db or more
Date: Thu, 07 Nov 1996 11:13:07 -0800
Organization: Naval Research Laboratory, Washington, DC
Lines: 21
Message-ID: <[e-mail]>
References: <01bbc9a8$67c6ef80$[e-mail]> <[e-mail]>
NNTP-Posting-Host: bill_harwood.chinalake.navy.mil
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (Macintosh; I; PPC)

Bruce W. Forsberg wrote:
>
> "Bill Frovik" <[e-mail]> wrote:
>
> >need info on a good pre amp for 1.2 gig atv.. other than that dam radio
> >shack
> >one..
> >thanks
> > n0mnb
> >bill
> PC Electronics sells the one from Downeast Electronics and it sells for $100
. I
> use it and it seems to do a good job.
>
> Bruce  WB6IZG


I am very pleased with the way the one on my 1.2 GHz repeater works.
They are a little cheaperif you buy them direct from Down East

Bill Harwood
AB6DY


From [e-mail] Sat Nov 16 17:22:57 1996
From: [e-mail] (Ottmar Lotz)
Subject: International Ham E-Mail list
Date: 7 Nov 96 13:46:43 -0800
Message-ID: <[e-mail]>
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!howland.erols.net!news.sprintlink.net!news-stk-200.sprintlink.net!news.msn.com!msn.com
Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (msn.com)
Lines: 14

Hi from Dl8FCS!!!

Need E-Mail addresses from HAM's world wide for my personal Ham Homepage.

You can find the list under

http://ourworld.compuserve.com/homepages/jodasoft/hammail.htm


My E-Mail address is: [e-mail]



TKS es vy 73 de DL8FCS, OP OLLI         :-)


From [e-mail] Sat Nov 16 17:22:58 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!news.magicnet.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.up.net!news
From: Roland Burgan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: LM568
Date: Tue, 12 Nov 1996 17:06:46 -0500
Organization: up.net
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: nb1-101.up.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; U)
CC: [e-mail]

I'm interested in using a LM568 to provide a carrier off alarm for
a CH. 5 TV transmitter, and at the same time provide a SAP output.
Any suggestions?


From [e-mail] Sat Nov 16 17:23:00 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!ais.net!usenet
From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for Motorola web page
Date: 9 Nov 1996 03:46:56 GMT
Organization: American Information Systems, Inc.
Lines: 20
Message-ID: <560urg$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Carl Stevenson)
NNTP-Posting-Host: ts03-29.dialup.ais.net
X-Newsreader: IBM NewsReader/2 v1.2.5

In <[e-mail]>, [e-mail] (Richard Arnold) writes:
>I wonder if anyone knows of a web site containing Motorola transistor
>data sheets? I'd like to get specs on the MRF475 and MRF476, for example.
>
>thanks and 73
>dick, W5VEC


Dick,

Check out Moto's site at: http://www.design-net.com

You will find a wealth of info ... and many data sheets and app notes in
Adobe .pdf format for downloading ...

73,
Carl - wa6vse
[e-mail]




From [e-mail] Sat Nov 16 17:23:01 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!dick
From: [e-mail] (Richard Arnold)
Subject: looking for Motorola web page
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Distribution: usa
Date: Sat, 9 Nov 1996 01:16:12 GMT
Lines: 5
Sender: [e-mail]

I wonder if anyone knows of a web site containing Motorola transistor
data sheets? I'd like to get specs on the MRF475 and MRF476, for example.

thanks and 73
dick, W5VEC


From [e-mail] Sat Nov 16 17:23:02 1996
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From: [e-mail] (Robert Fowle)
Newsgroups: rec.radio.amateur.homebrew
Subject: LOOKING FOR NORTHEREN RADIO VFO MODEL 115
Date: Mon, 11 Nov 1996 06:01:14 GMT
Organization: The HAMMARLUND Historian
Lines: 21
Message-ID: <[e-mail]>
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looking for NORTHEREN RADIO VFO MODEL 115,
this is a rack mount unit.
if you have one you'll sell/trade, please email me
with details.
thank you
Visit my Web Page.....
=================================================]-[->
Robert Fowle      KC8DBC
The HAMMARLUND Historian
Ph. 517-789-6721
1215 Winifred
Jackson, Mich. 49202-1946
E-mail:  [e-mail]
Web Page:  http://www.jacksonmi.com/hammarlund
                 HAMMARLUND LITERATURE WANTED
WANTED: MANUALS FOR ANY MAKE RADIO EQUIPMENT
=================================================]-[->
see it first on my list...to be put on the 'mail list'  (send me email)
or see it later in.....
Boatanchors  news group:   rec.radio.amateur.boatanchors



From [e-mail] Sat Nov 16 17:23:03 1996
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From: [e-mail] (Bruce KD1MW)
Newsgroups: rec.radio.amateur.homebrew
Subject: Microwave devices for sale.
Date: 9 Nov 1996 15:44:02 GMT
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Lines: 13
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Greetings, I have the following items up for best offer:

1-AYDEN MICROWAVE Ga As FET amp (4450B2S), SMA Connectors
1- CALIFORNIA MICROWVE OSC 52-100833-01 (-) MT5ON-213(-), 4500-5000MHZ.
4-MERIMAC coaxial variable attenuators (ASM2-15-11K), SMA Connectors.
3-MERIMAC coaxial variable attenuators (AUMP-25A),SMA Connectors.
5-Emco 20db directional coupplers,SMA Connectors.
2- KDI 10 db directional coupplers,SMA Connectors.
1-coaxial LP filter 6000MHZ,SMA Connectors.
1 NARDA power divider 4.8 GHZ (4314-2)
8-connectors N (F) to SMA (F) panel mount.
several short lengths of semi-ridgid coax with SMA (M) connectors.
Thanks for the interest.  Bruce/ ND1MW  [e-mail]


From [e-mail] Sat Nov 16 17:23:04 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: More Amplifier Stuff
Date: 13 Nov 96 21:24:25 GMT
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Only a few more digests to go!

I wish to echo Tom's assertion that the anode voltage can soar to very
high values above what is normal when it is lightly loaded.  I would
say what he said in a different way.

One of the things that we teach in introductory electronics is that
the current through an inductor cannot make an instantaneous change in
value.  Any tube operating in a mode other than class A works by
alternately conducting and not conducting.  When the tube stops
conducting the current through the plate choke continues at the same
level it was when the tube quit conducting.  In a properly loaded tank
the impedance of the tank is a close match to the impedance of the
tube and the voltage will not be affected much when the tube cuts off.
However, in a lightly loaded network, the impedance can be many times
higher (let's say 10 times higher).  In this case as soon as the tube
cuts off, the current that is flowing in the plate choke is now
driving a 10 times higher impedance.  This results in an immediate
increase to 10 times the anode voltage.

This is a simplified example and not entirely accurate in the details,
but the main point of the reason for an increased voltage remains.
It's not nearly as magical as it seems.

Ray Mack



From [e-mail] Sat Nov 16 17:23:06 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More Amplifier Stuff
Date: 14 Nov 1996 01:27:30 GMT
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In article <[e-mail]>, [e-mail]
writes:

>However, in a lightly loaded network, the impedance can be many times
>higher (let's say 10 times higher).  In this case as soon as the tube
>cuts off, the current that is flowing in the plate choke is now
>driving a 10 times higher impedance.  This results in an immediate
>increase to 10 times the anode voltage.
>
>This is a simplified example and not entirely accurate in the details,
>but the main point of the reason for an increased voltage remains.
>It's not nearly as magical as it seems.
>
>Ray Mack

Hi Ray,

Actually there are many things going on, and both of our examples were
abbreviated, hi/.  I posted a longer explaination, but it is floating out
in the never never land of AOL.
In any case, the huge flywheel of the tank dominates and sets the load for
the choke.

I have a *long* basic language (yuk) program I wrote that calculates the
voltage and other parameters, and come pretty close.

(I am really amazed that more people don't understand this stored energy
effect, but when I look it isn't in many Handbooks.)

I posted the thing about voltage on a contest group, someone right away
came back with "perpetum momentium" or something to that effect.
Fortunately, he was receptive to measuring a PA. When he made an actual
measurement, he found EXACTLY the voltage predicted for his tube type
under a certain load condition...and that anode voltage went negative over
a small portion of the cycle.

73 Tom


From [e-mail] Sat Nov 16 17:23:07 1996
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From: [e-mail] (Marijan Miletic)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More amplifier stuff
Date: 15 Nov 96 04:55:34 GMT
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Tom, W8JI gave my callsign wrongly as S59A and I am the person who thought tha
t
instantenous plate voltage can never exceed 2 x DC value as my internal model
was strictly linear which is NOT the case with overdriven but lightly loaded
tube (or transistor).  I Measure-d my SB-220 and found RF voltages exceeding D
C
with antenna shortened.  I almost melted output coax connector but it was wort
h
the effort as a new insight into the actual physics was gained.
Following the claims on some fancy phenomenons from California, I got a feelin
g
that a gentleman lives close to Hollywood.  Fuse resistors call for outright
disaster with their "speedy" action.  At least, don't use flamable ones...
73 de Mario, S56A, N1YU.
P.S.  I don't want to get involved in O.J. type proofs from certain letter!


From [e-mail] Sat Nov 16 17:23:08 1996
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From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More amplifier stuff
Date: Sat, 16 Nov 1996 15:50:53 GMT
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On 15 Nov 96 04:55:34 GMT, [e-mail] (Marijan Miletic)
wrote:

>Tom, W8JI gave my callsign wrongly as S59A and I am the person who thought th
at
>instantenous plate voltage can never exceed 2 x DC value as my internal model
>was strictly linear which is NOT the case with overdriven but lightly loaded
>tube (or transistor).  I Measure-d my SB-220 and found RF voltages exceeding
DC
>with antenna shortened.  I almost melted output coax connector but it was wor
th
>the effort as a new insight into the actual physics was gained.
>Following the claims on some fancy phenomenons from California, I got a feeli
ng
>that a gentleman lives close to Hollywood.  Fuse resistors call for outright
>disaster with their "speedy" action.  At least, don't use flamable ones...
>73 de Mario, S56A, N1YU.
>P.S.  I don't want to get involved in O.J. type proofs from certain letter!

Mario, without a doubt, your test method is without peer!  I would
never have thought to short an  antenna that was connected to a "over
driven", un-loaded  SB-220 to compare the DC with the un-loaded RF
voltage. By the way, what was the exact magnitude of the RF voltage
and the instrument used to measure it?  Or, was "almost" melting the
output connector the guage you used to determine the RF voltage was
twice the DC voltage?
Jesse, W6KKT (50 miles north of Hollywood)




From [e-mail] Sat Nov 16 17:23:09 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: More Grid stuff
Date: 13 Nov 96 20:24:49 GMT
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Well, I finally got through a 10 more digests.  I think I'm up to 11/5
now.  This topic has generated a bunch of bits!

Tom has quite correctly stated that the kinetic energy is the
*primary* heat producer.  This is the same effect that accounts for
the lion's share of heat produced in the anode.  Gary's analysis
sounds good in terms of there being very little energy due to the 100
EV for each electron, but when you consider that 150 mA is a *lot* of
electrons it quickly adds up!  Looked at another way 150 mA into a
grid at 100V is no different than 150mA into the plate of a receiving
tube at 100V anode potential.  Its still 15W either way.

I stand by my previous statements that it's those blasted secondary
effects that have been mentioned by Tom, Ian, and Gary that are not
well defined that will eat your lunch.  Until we have better models we
will never adequately solve these problems.  Our solutions will
continue to be black magic.


Ray Mack



From [e-mail] Sat Nov 16 17:23:11 1996
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From: [e-mail] (John Wilkerson)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Followup-To: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Date: 8 Nov 1996 17:28:59 -0500
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Steve Work ([e-mail]) wrote:
: Phil ([e-mail]) wrote:
: : About the simplest NBFM modulator that you can build is a variable
: : capacitance modulator using a varactor diode as the active component.
: : When properly biased, this device will give you a frequency swing of up to

: : 7.5khz deviation (on some) which you can easily control to the desired
: : 5khz. The device is installed at the oscillator tuning circuit and causes
: : an increased/decreased capacitance in that tuning circuit which
: : effectively changes the frequency of the oscillator with respect to the
: : audio signal that is riding on top of the bias voltage.

: Can anyone here spell "nonlinear", or "distortion"??

  just what I was thinking.  FM is most unforgiving when it comes to
overmodulation.  Even a loud voice on some FM transmitters can distort to
the point of unintelligibility.
--
 John L. Wilkerson Jr...    [e-mail]
                            [e-mail]
                            http://www.iwaynet.net/~johnw
Rec.radio.cb FAQ coordinator


From [e-mail] Sat Nov 16 17:23:12 1996
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Date: 7 Nov 1996 18:18:38 GMT
Organization: Hewlett-Packard
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> > Phil ([e-mail]) wrote:
> > : About the simplest NBFM modulator that you can build is a variable
> > : capacitance modulator using a varactor diode as the active
>component.
> > : When properly biased, this device will give you a frequency swing
>of up to
> > Can anyone here spell "nonlinear", or "distortion"??
>
>
>N O N L I N E A R
>
>I'll skip the other ...
>
>Seriously, Steve, whats' the problem ... many commercial radios have
>been
>built using this technique, and, believe me, the distortion will occur
>much earlier in the simple deviation limiting circuits employed before
>the NBFM modulator (been there, done that ...).
>
>Jim

We used this technique at Konel in some marine radios.  It is
actually fairly easy to build an essentially linear tuning VCXO
to make one of these modulators (as long as the crystal frequency
is at least 15 MHz.).  In any event, for communications radios,
the audio distortion in the clipper is far more than what is due
to the VCXO, so in practice, the VCXO might as well be
distortionless.  Now if you were building an FM broadcast
transmitter, that would be another story..., but of course you
would never be able to get 75 kHz. deviation in the first place,
so it's a moot point.

The one problem that we did have with these modulators was
temperature stability.  We finally designed them out mainly for
this reason, but also for simplicity, as a modulator that wiggles
the synthesizer's tuning voltage requires just a few parts.

Rick Karlquist N6RK
Now with Hewlett Packard
[e-mail]


From [e-mail] Sat Nov 16 17:23:13 1996
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From: [e-mail] (John Lundgren)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Followup-To: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Date: 9 Nov 1996 10:13:08 GMT
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Steve Work ([e-mail]) wrote:
: Phil ([e-mail]) wrote:
: : About the simplest NBFM modulator that you can build is a variable
: : capacitance modulator using a varactor diode as the active component.
: : When properly biased, this device will give you a frequency swing of up to

: : 7.5khz deviation (on some) which you can easily control to the desired
: : 5khz. The device is installed at the oscillator tuning circuit and causes
: : an increased/decreased capacitance in that tuning circuit which
: : effectively changes the frequency of the oscillator with respect to the
: : audio signal that is riding on top of the bias voltage.

: Can anyone here spell "nonlinear", or "distortion"??

Seems to me that if it's NBFM, the least of their problems would be
distortion - like who cares..  For most of the real world, the NBFM is
done by pulling the freq of a crystal before it is multiplied up to the
Xmit freq.  The multiplication also multiplies the deviation.


--
#===================================================================#
|    John Lundgren - Elec Tech - Info Tech Svcs. |    jlundgre@     |
|    Rancho Santiago Community College District  |   deltanet.com   |
|     17th St at Bristol \ Santa Ana, CA 92706   | http://www.rancho|
| My opinions are my own, and not my employer's. |    .cc.ca.us     |
|   Most FAQs are available through Thomas Fine's WWW FAQ archive:  |
|http://www.cis.ohio-state.edu:80/hypertext/faq/usenet/FAQ-List.html|
|     "Babe Ruth struck out 1,330 times...  keep on swinging."      |
|     says the lid on the jar of Laredo & Lefty's Picante Salsa     |
!  You MAY NOT use my email address for unsolicited Email or lists! !
#======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#



From [e-mail] Sat Nov 16 17:23:15 1996
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From: Ian Robert Walker <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics
Subject: Re: NBFM modulator: design wanted
Date: Sat, 9 Nov 1996 19:12:38 +0000
Organization: none
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References: <55mr2q$[e-mail]> <55u5fg$[e-mail]>
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In article <55u5fg$[e-mail]>, Carl Stevenson <[e-mail]>
writes
>In <55mr2q$[e-mail]>, [e-mail] (Maroof H.
>Choudhury) writes:
>>Can anybody suggest a simple design of a narow band frequency
>>modulator for Citizen's band?
>
>I see that you have gotten numerous responses regarding varactors, etc.
>
>However, I did not see anyone point out that FM is not legal on CB
>(At least in the US, unless the rules have changed dramatically)

Maybe he is not in the USA. FM is the only legal mode in Europe,
although home built is defiantly not legal.

>
>I'm curious ... Why do you want to build an FM modulator for CB???

At a guess, to talk to people who can only use FM.
--
Ian G8ILZ
I have an IQ of 6 million,  |  How will it end?  | Mostly
or was it 6?                |  In fire.          | harmless


From [e-mail] Sat Nov 16 17:23:16 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: [e-mail] (Steve Work)
Subject: Re: NBFM modulator: design wanted
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
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John Lundgren ([e-mail]) wrote:

: Seems to me that if it's NBFM, the least of their problems would be
: distortion - like who cares..  For most of the real world, the NBFM is
: done by pulling the freq of a crystal before it is multiplied up to the
: Xmit freq.  The multiplication also multiplies the deviation.


True, the distortion is going to increase as the modulation index
increases.  On narrow FM you'll have very little distortion, but it would
definitely be a problem if were trying to modulate a 400Khz subcarrier at
90Khz deviation.


From [e-mail] Sat Nov 16 17:23:17 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: [e-mail] (Gary Coffman)
Subject: Re: NBFM modulator: design wanted
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <560c7b$[e-mail]>
Date: Sat, 9 Nov 1996 11:34:52 GMT
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In article <560c7b$[e-mail]> [e-mail]
 writes:
>Steve Work ([e-mail]) wrote:
>: Phil ([e-mail]) wrote:
>: : About the simplest NBFM modulator that you can build is a variable
>: : capacitance modulator using a varactor diode as the active component.
>: : When properly biased, this device will give you a frequency swing of up t
o
>: : 7.5khz deviation (on some) which you can easily control to the desired
>: : 5khz. The device is installed at the oscillator tuning circuit and causes

>: : an increased/decreased capacitance in that tuning circuit which
>: : effectively changes the frequency of the oscillator with respect to the
>: : audio signal that is riding on top of the bias voltage.
>
>: Can anyone here spell "nonlinear", or "distortion"??

Can anyone spell "industry standard"? The use of a varactor to modulate
the oscillator is the standard way NBFM radios are modulated. Motorola
has used the technique for decades, as have most of the other manufacturers.
A properly selected and biased varactor is very linear in its response
across the center of its tuning range. Of course it is biased to operate
precisely in that most linear area.

The other major technique, used in the bad old days before varactors,
isn't really FM modulation at all. It is PM, phase modulation, in a
follower stage (called a reactance modulator) after the oscillator.
The output of a PM modulator is essentially the same as the output
of a FM modulator, but with an added 6 db per octave pre-emphasis.
The standard varactor FM modulator does not inherently add pre-emphasis,
so an external pre-emphasis network is used to allow PM and FM radios
to interoperate. Note that PM can't reproduce DC as a fixed shift in
frequency, but a true FM modulator can. This can be important in data
transmission but is of no concern with speech.

Now PM can't achieve the deviation that direct FM can, so there
are usually several stages of multiplication after the PM modulator
to bring the signal on frequency and achieve the required deviation.
Varactor modulation can use this too, with the varactor moving a
crystal oscillator only a small amount, say 277 Hz, and then
multiplying up to operating frequency. A 18x multiplication will
give 5 kHz deviation for example. But a varactor modulator can
also be used directly on frequency because it can offer much
greater deviation than a PM modulator. In fact, all PLL radios
use a varactor as the control element of the on-channel VCO,
which for a 2m radio has a tuning range of at least 4 MHz, just
from varying the varactor voltage. Modulation is inserted into
the error loop of the PLL.

Incidently, the error loop filter kills DC response for this style
of radio too, so use of PLL radios for data can be a problem. That's
why a varactor modulated crystal controlled radio is preferred for
9600 baud data transmission.

>  just what I was thinking.  FM is most unforgiving when it comes to
>overmodulation.  Even a loud voice on some FM transmitters can distort to
>the point of unintelligibility.

This is a receiver artifact and not a transmission problem. When
the signal goes outside the passband of the receiver IF, or exceeds
the linear range of the discriminator, severe distortion occurs.
But this distortion is *in the receiver* and not in the transmitter.
If the signal is very much over-deviated, the noise squelch amp
in the receiver sees it and can actually squelch the receiver on
voice peaks. Audio limiting is used in NBFM transmitters to avoid
causing these receiver problems (and to keep the transmitter's
modulation inside its assigned channel).

That's why you'll normally find a mic gain pot and a deviation pot
inside NBFM radios. The audio limiter is in between. By juggling
these two adjustments, you can control the onset of limiting so
that it occurs just at 5 kHz deviation for normal speech peaks.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sat Nov 16 17:23:18 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: [e-mail] (Steve Work)
Subject: Re: NBFM modulator: design wanted
Message-ID: <[e-mail]>
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Ian Robert Walker ([e-mail]) wrote:

: Maybe he is not in the USA. FM is the only legal mode in Europe,
: although home built is defiantly not legal.

: >
: >I'm curious ... Why do you want to build an FM modulator for CB???

: At a guess, to talk to people who can only use FM.

People with "regular" AM CB radios would probably still be able to hear
the conversation, though.


From [e-mail] Sat Nov 16 17:23:20 1996
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From: [e-mail] (Tony Langdon)
Date: 11 Nov 96 16:35:01
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: NBFM modulator: design wanted
Message-ID: <[e-mail]>
References: <[e-mail]> <560c7b$[e-mail]> <[e-mail]>
X-FTN-To: [e-mail]
Organization: Fidonet: Freeway Usenet <=> FTN gateway
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Xref: news1.epix.net rec.radio.amateur.homebrew:21006 rec.radio.cb:37524 sci.electronics.design:25353 sci.electronics.misc:17146

It's 09 Nov 96  21:34,
We'll return to [e-mail] and All's
discussion of NBFM modulator: design wanted

 ga> Can anyone spell "industry standard"? The use of a varactor to
 ga> modulate the oscillator is the standard way NBFM radios are modulated.
 ga> Motorola has used the technique for decades, as have most of the other
 ga> manufacturers. A properly selected and biased varactor is very linear
 ga> in its response across the center of its tuning range. Of course it is
 ga> biased to operate precisely in that most linear area.

You are indeed correct here.  there are few radios using a PLL that
don't use a varactor based modulator.  I do know of one or two
commercial two-ways that fit this category, but the vast majority simply
insert the audio into the main PLL loop (including Eurpean FM CB's).

 ga> use a varactor as the control element of the on-channel VCO,
 ga> which for a 2m radio has a tuning range of at least 4 MHz, just
 ga> from varying the varactor voltage. Modulation is inserted into
 ga> the error loop of the PLL.

This is the most common technique I've seen used.

 ga> This is a receiver artifact and not a transmission problem. When
 ga> the signal goes outside the passband of the receiver IF, or exceeds
 ga> the linear range of the discriminator, severe distortion occurs.
 ga> But this distortion is *in the receiver* and not in the transmitter.
 ga> If the signal is very much over-deviated, the noise squelch amp
 ga> in the receiver sees it and can actually squelch the receiver on
 ga> voice peaks. Audio limiting is used in NBFM transmitters to avoid
 ga> causing these receiver problems (and to keep the transmitter's
 ga> modulation inside its assigned channel).

Indeed, if you listen to an unlimited and overmodulated FM transmission
with a wideband FM scanner, you can get some really nice audio!  Doesn't
do wonders for the people on adjacent channels though. :-)

 ga> That's why you'll normally find a mic gain pot and a deviation pot
 ga> inside NBFM radios. The audio limiter is in between. By juggling
 ga> these two adjustments, you can control the onset of limiting so
 ga> that it occurs just at 5 kHz deviation for normal speech peaks.

Only problem with this arrangement is where you get two (or more) people
with widely differing voice levels.  One may be hardly heard, while the
other drives the clipper so hard that the audio is grossly distorted.  I
generally adjust my mike gain pot down a little to reduce distortion (I
have a tendancy to overdrive some transmitters' audio stages :) ).

... Things that make you go hmmmmmmm.
--
| Fidonet:  Tony Langdon 3:632/367.2
| Internet: [e-mail]
|
| Freeway Internet Gateway, Melbourne, Australia.  For information about
| our services and conditions of use, e-mail:
| [e-mail], to receive a copy of the FAQ.


From [e-mail] Sat Nov 16 17:23:20 1996
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From: [e-mail] (Alan Larson)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Date: 11 Nov 1996 17:48:02 GMT
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In article <561lfk$[e-mail]> [e-mail] (John
 Lundgren) writes:

>Seems to me that if it's NBFM, the least of their problems would be
>distortion - like who cares..  For most of the real world, the NBFM is
>done by pulling the freq of a crystal before it is multiplied up to the
>Xmit freq.  The multiplication also multiplies the deviation.


  Nowdays, most of the world generates NBFM with varactor modulators in
PLL circuits.  This allows radios with microprocessor controlled frequency
selection.

  Multiplication of the xtal frequency is a rather ancient method now.


        Alan


From [e-mail] Sat Nov 16 17:23:22 1996
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Date: 11 Nov 1996 04:41:01 GMT
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In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>
>Can anyone spell "industry standard"? The use of a varactor to modulate
>the oscillator is the standard way NBFM radios are modulated. Motorola
>
>The other major technique, used in the bad old days before varactors,
>isn't really FM modulation at all. It is PM, phase modulation, in a
>follower stage (called a reactance modulator) after the oscillator.
>The output of a PM modulator is essentially the same as the output
>of a FM modulator, but with an added 6 db per octave pre-emphasis.
>The standard varactor FM modulator does not inherently add pre-emphasis,
>so an external pre-emphasis network is used to allow PM and FM radios
>
>Now PM can't achieve the deviation that direct FM can, so there
>are usually several stages of multiplication after the PM modulator

Another way to get enough deviation is to cascade several phase
modulators.

>That's why you'll normally find a mic gain pot and a deviation pot
>inside NBFM radios. The audio limiter is in between. By juggling
>these two adjustments, you can control the onset of limiting so
>that it occurs just at 5 kHz deviation for normal speech peaks.
>
>Gary Coffman KE4ZV          |    You make it,     | Due to provider problems

It's more complicated than that.  There is the question of
whether you do the clipping before or after the pre-emphasis.
Motorola got a patent on the technique of clipping *after*
pre-emphasis.  In those days, phase modulators were used as
Gary says, and pre-emphasis was built in to the modulator.
The simplest thing was to put an audio clipper before the
phase modulator (hence before pre-emphasis).  To implement
the Motorola technique, you had to 1. pre-emphasize, 2. clip
3. de-emphasize and 4. phase modulate (equivalent to FM +
pre-emphasis).  Step 3 was to make step 4 look like a real
frequency modulator.  You got much better "talk power", as
CB'ers would say.  If I have any of this wrong, someone correct
me, but that's what we did at Konel.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Sat Nov 16 17:23:23 1996
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From: Phil <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Date: 12 Nov 1996 17:47:47 GMT
Organization: Xyplex, Inc.
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Interesting Conversation!

But you guys overlooked a key request from the initial poster.

S I M P L E   !

-> Phil



From [e-mail] Sat Nov 16 17:23:23 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NBFM modulator: design wanted
Date: 13 Nov 1996 08:40:19 GMT
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In article <56af1p$[e-mail]>, Phil <[e-mail]>
writes:

>Anyhow, thanks again for the support!
>
>That'll teach me to drop a hint and take a vacation!
>
>-> Phil KKC4849 (Calamity), KA1NHZ, AFA1MY, Patriot 655

I'll have to admit, I learned a few things too.  It was/is a good
thread...

:+> Andy <+:


From [e-mail] Sat Nov 16 17:23:25 1996
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From: Phil <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: design wanted
Date: 12 Nov 1996 18:18:33 GMT
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WOW! Thanks Gary:

I didn't realize that I was opening up such a can of worms and I have been
away a few days from the group.

Firstly, I think some of the responders were missing th a point when the
original poster asked for a 'SIMPLE' FM modulator.

Secondly, You are absolutely correct about the deviation levels provided
by a varactor. The others have also missed the point on proper biasing of
the diode to drive it to the desired result. A deviation level that falls
within the receiver specifications and complies with the passband limits
is perfectly do-able by any standards and is dependent on a stable and
well controlled bias. In designing  a varactor modulator to a specific
receiver you would have to monitor this condition, but once designed in,
you're done.

Thirdly, there are dozens of methods of frequency or phase modulating a
carrier but none as simple as the varactor method. Unless of course the
original poster wants to start playing with PLLs which can be a bear to
control. Especially since there job is to fight to keep the frequency
stable.

Anyhow, thanks again for the support!

That'll teach me to drop a hint and take a vacation!

-> Phil KKC4849 (Calamity), KA1NHZ, AFA1MY, Patriot 655



From [e-mail] Sat Nov 16 17:23:26 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: [e-mail] (Gary Coffman)
Subject: Re: NBFM modulator: design wanted
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
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Date: Tue, 12 Nov 1996 14:29:56 GMT
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In article <[e-mail]> [e-mail] (T
ony Langdon) writes:
> ga> This is a receiver artifact and not a transmission problem. When
> ga> the signal goes outside the passband of the receiver IF, or exceeds
> ga> the linear range of the discriminator, severe distortion occurs.
> ga> But this distortion is *in the receiver* and not in the transmitter.
> ga> If the signal is very much over-deviated, the noise squelch amp
> ga> in the receiver sees it and can actually squelch the receiver on
> ga> voice peaks. Audio limiting is used in NBFM transmitters to avoid
> ga> causing these receiver problems (and to keep the transmitter's
> ga> modulation inside its assigned channel).
>
>Indeed, if you listen to an unlimited and overmodulated FM transmission
>with a wideband FM scanner, you can get some really nice audio!  Doesn't
>do wonders for the people on adjacent channels though. :-)
>
> ga> That's why you'll normally find a mic gain pot and a deviation pot
> ga> inside NBFM radios. The audio limiter is in between. By juggling
> ga> these two adjustments, you can control the onset of limiting so
> ga> that it occurs just at 5 kHz deviation for normal speech peaks.
>
>Only problem with this arrangement is where you get two (or more) people
>with widely differing voice levels.  One may be hardly heard, while the
>other drives the clipper so hard that the audio is grossly distorted.  I
>generally adjust my mike gain pot down a little to reduce distortion (I
>have a tendancy to overdrive some transmitters' audio stages :) ).

Yeah. There are better ways to deal with this than using a simple
hard clipper, though that is commonly used. The first step above
a hard clipper is a soft limiter. GE used a custom hybrid to do
this in their older equipment (Exec II, Mastr II). Instead of
hard clipping of peaks, gain decreases as the peak is approached.
This is less "harsh" than a hard clipper, but of course still
introduces distortion. Today, there are several chips on the
market which do this. Basically this is audio AGC with a time
constant which allows gain control of individual cycles of
audio.

A step up from just a soft limiter is to add a syllabic rate audio
AGC system, gated to prevent background noise pumping. Commercial
FM broadcast uses units like the Volumax, Audimax, Optimod, etc to
process the audio prior to modulation to control deviation overshoot
while trying to make any necessary distortion unobjectionable (any
processing *at all* is a form of signal distortion of course). Gated
compression into a soft limiter (often in multiple bands) is at the
heart of most of these units. When it is set up right, it can sound
pleasing, and can handle a wide range of input levels. (When set up
wrong, as many rock stations do, it just sounds *loud*, without any
real dynamics at all.)

It doesn't really matter whether we use a varactor modulator or a
reactance modulator or even some exotic pulse repetition rate modulator
to generate the FM, we still have to control the baseband audio going
into the modulator to keep the deviation within the limits of the
receiver (and the law). This is the most challenging aspect of FM
system design.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sat Nov 16 17:23:27 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: John EVANS <[e-mail]>
Subject: Re: NBFM modulator: design wanted
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As an aside, could somebody please tell me the frequency deviation
for a commercial (European) FM station? Thank you, John.


From [e-mail] Sat Nov 16 17:23:28 1996
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Subject: Re: NBFM modulator: design wanted
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As an aside, could somebody please tell me the frequency deviation
for a commercial (European) FM transmitter.
Thanks, John.


From [e-mail] Sat Nov 16 17:23:29 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: [e-mail] (Steve Work)
Subject: Re: NBFM modulator: design wanted
Message-ID: <[e-mail]>
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John EVANS ([e-mail]) wrote:
: As an aside, could somebody please tell me the frequency deviation
: for a commercial (European) FM transmitter.
: Thanks, John.

Most commercial FM stations use a 75Khz deviation.


From [e-mail] Sat Nov 16 17:23:30 1996
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From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Date: 14 Nov 1996 11:55:30 GMT
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>>The standard varactor FM modulator does not inherently add pre-emphasis,
>>so an external pre-emphasis network is used to allow PM and FM radios

Being relatively new to this NG, what is pre-and de-emphasis exactly?  I know
it's used in FM communications, but how and why?  Why is it needed?  FM
commercial stations use it.  Why?  I'm reading this post on it and I'm kind of

lost.  Any help would be greatly appreciated.  Thanks.
Tyler
N3SPD





From [e-mail] Sat Nov 16 17:23:31 1996
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From: [e-mail] (Bayard Coolidge USG ZKO3-3/S20)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 4cx250x amplifier schematics
Date: 8 Nov 1996 16:50:08 GMT
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--
[e-mail] wrote in  <[e-mail]>:

>>>     I need schematics for amplifiers using the 4cx250 tubes, any number
>>>     of tubes...    Any help would be greatly appreciated


Well, you didn't specify what frequency range you were interested in, and
you didn't mention your amateur callsign, if you have one, so it's a bit
difficult to specifically answer your question.

However, the Radio Amateurs Handbook, published by the American Radio
Relay League, 225 Main St., Newington, CT 06111 http://www.arrl.org
has had a number of construction articles over the years. (The Handbook
is revised/updated annually). Giving you just a schematic is short-changing
you because with high-power amplifiers, particularly at VHF and above,
the construction techniques employed are a very significant part of
the amplifier design. Telling you in a schematic that a quarter-wave
line is hanging off the plate is one thing, _showing_ you that it's a
swaged piece of copper plumbing with Teflon(R) wrapped around the anode
is quite another! Cooling techniques can be rather interesting, too...

There are other texts available, such as the "Radio Handbook" by Bill
Orr, W6SAI, published by Sams Publications, that can provide a great
deal of information as well. I'm sure other readers in the group can
add their favourite texts to the bibliography!

------------------------------------------------------------------------------
Bayard R. Coolidge      N1HO    DISCLAIMER: The opinions expressed are
Digital Equipment Corp.         solely those of the author, and not
Nashua, New Hampshire, USA      those of Digital Equipment Corporation
[e-mail]            nor any other entity.
    "Brake for Moose - It can save your life" - N.H. Fish & Game Dept.
------------------------------------------------------------------------------


From [e-mail] Sat Nov 16 17:23:32 1996
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From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 4cx250x amplifier schematics
Date: Mon, 11 Nov 1996 13:45:53 +0000
Organization: Rutherford Appleton Laboratory, Oxon, UK
Lines: 13
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References: <[e-mail]> <55th33$[e-mail]>
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Jim wrote:
>
> Also, there was an intriguing article in Ham Radio magazine
> on a non-forced-air cooled 4CX250 "QRP" amp, but I don't have the
> reference for this article.  You could use that schematic
> with forced-air cooling and a higher Ep for a bigger bang.
>
> N6OTQ

you can not run easily a 4cx250B without forced air cooling. The heater
is the problem. Eventually the ceramic base will crack. Some form of
conduction cooling would be needed. Better to use one of the conduction
cooled members of the same valve family.


From [e-mail] Sat Nov 16 17:23:34 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 4cx250x amplifier schematics
Date: 11 Nov 1996 17:36:52 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 12
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Message-ID: <[e-mail]>
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In article <[e-mail]>, Mike Willis <[e-mail]>
writes:

>
>you can not run easily a 4cx250B without forced air cooling. The heater
>is the problem. Eventually the ceramic base will crack. Some form of
>conduction cooling would be needed.

Eimac warns against applying filament power without airflow, because even
heater power can damage base seals.

73 Tom


From [e-mail] Sat Nov 16 17:23:35 1996
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From: [e-mail] (Stephen Dunifer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Coil Winding Machine
Date: 13 Nov 1996 19:10:48 -0800
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 9
Message-ID: <56e2jo$[e-mail]>
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Anyone have any idea of where I might find a coil winding machine ?  I
need one for a small production shop.

Thanks,

Stephen Dunifer
[e-mail]


From [e-mail] Sat Nov 16 17:23:36 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need hard to find parts!
Date: 10 Nov 1996 01:23:15 GMT
Lines: 19
Message-ID: <563aq3$jd4$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
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X-Newsreader: IBM NewsReader/2 2.0

In <[e-mail]>, T Fultz <[e-mail]> writes:
>I'd like to learn to build some of my own gear.  I've found some pretty
>nice projects in a copy of 'Solid State Design' but I don't know where
>to find some of the components.  Since this copy is a 1978 copy, I'm
>sure some of the parts listed are going to be next to impossible to
>find.
>  Some of these components are:
>    Amidon T-50-6 cores
>    Millen 22050 4-54pF variable caps
>    Various Miller inductors
>    and Especially coil stock of all 'shapes and sizes'
>                         (who has this stuff anymore)
>
>Basically, I'd like to experiment and I can't find anybody with parts
>anymore.  I've been to a number of ham fests and they're just not around
>anymore.
>     Please help...
>      KE4RVB  (Tim   [e-mail])



From [e-mail] Sat Nov 16 17:23:37 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need hard to find parts!
Date: 10 Nov 1996 01:28:01 GMT
Lines: 30
Message-ID: <563b31$jd4$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
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X-Newsreader: IBM NewsReader/2 2.0

In <[e-mail]>, T Fultz <[e-mail]> writes:
>I'd like to learn to build some of my own gear.  I've found some pretty
>nice projects in a copy of 'Solid State Design' but I don't know where
>to find some of the components.  Since this copy is a 1978 copy, I'm
>sure some of the parts listed are going to be next to impossible to
>find.
>  Some of these components are:
>    Amidon T-50-6 cores
>    Millen 22050 4-54pF variable caps
>    Various Miller inductors
>    and Especially coil stock of all 'shapes and sizes'
>                         (who has this stuff anymore)
>
>Basically, I'd like to experiment and I can't find anybody with parts
>anymore.  I've been to a number of ham fests and they're just not around
>anymore.
>     Please help...
>      KE4RVB  (Tim   [e-mail])


   Hi Tim,
  First of all congratulations on trying. Now, two places to check. #1 try
 calling MAI electronics in Indianapolis, Indiana. they have a ton of Miller
 coils etc. all marked in the boxes. #2, email me at '[e-mail]' and
 there is a joint 'Pembleton Electronics' in Fort Wayne that I swing by once a
 week and will see if they have what your looking for. If they do, I'll have
 them set it aside, and you arrange for the purchase.

                                         73's - Jim WD9AHF



From [e-mail] Sat Nov 16 17:23:38 1996
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From: woody white <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need hard to find parts!
Date: Sun, 10 Nov 1996 05:56:12 -0800
Organization: http://www.geocities.com/capecanaveral/3722
Lines: 46
Message-ID: <[e-mail]>
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[e-mail] wrote:
>
> In <[e-mail]>, T Fultz <[e-mail]> writes:
> >I'd like to learn to build some of my own gear.  I've found some pretty
> >nice projects in a copy of 'Solid State Design' but I don't know where
> >to find some of the components.  Since this copy is a 1978 copy, I'm
> >sure some of the parts listed are going to be next to impossible to
> >find.
> >  Some of these components are:
> >    Amidon T-50-6 cores

I think Amidon Associates are still in business.  Santa Ana, California???
They are a small lot reseller.  _W_

> >    Millen 22050 4-54pF variable caps

Mouser Electronics (and others) sells mini and sub-mini caps that will (I
believe) substitute.  _W_

> >    Various Miller inductors
> >    and Especially coil stock of all 'shapes and sizes'
> >                         (who has this stuff anymore)
> >
> >Basically, I'd like to experiment and I can't find anybody with parts
> >anymore.  I've been to a number of ham fests and they're just not around
> >anymore.

Some 'fests are better than others for this sort of thing...

There are a number of vendors who don't have too large a minimum order (or typ
.
a $5 surcharge if under)....  I have used Mouser Electronics and DigiKey and
find them very good.  Another I have used is Hosfelt Electronics (been a
while).

Other possibilities (includes surplus vendors): DC Eclectronics, Marlin P.
Jones, All Electronics, Cumminications Concepts Inc., MCM Electronics, C & H
Sales.   _Woody_


--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Sat Nov 16 17:23:39 1996
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From: Don Wines <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need hard to find parts!
Date: Sun, 10 Nov 1996 14:06:57 -0600
Organization: East Texas Internet
Lines: 64
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References: <[e-mail]> <563b31$jd4$[e-mail]> <[e-mail]>
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woody white wrote:
>
> [e-mail] wrote:
> >
> > In <[e-mail]>, T Fultz <[e-mail]> writes:
> > >I'd like to learn to build some of my own gear.  I've found some pretty
> > >nice projects in a copy of 'Solid State Design' but I don't know where
> > >to find some of the components.  Since this copy is a 1978 copy, I'm
> > >sure some of the parts listed are going to be next to impossible to
> > >find.
> > >  Some of these components are:
> > >    Amidon T-50-6 cores
>
> I think Amidon Associates are still in business.  Santa Ana, California???
> They are a small lot reseller.  _W_
>
> > >    Millen 22050 4-54pF variable caps
>
> Mouser Electronics (and others) sells mini and sub-mini caps that will (I
> believe) substitute.  _W_
>
> > >    Various Miller inductors
> > >    and Especially coil stock of all 'shapes and sizes'
> > >                         (who has this stuff anymore)
> > >
> > >Basically, I'd like to experiment and I can't find anybody with parts
> > >anymore.  I've been to a number of ham fests and they're just not around
> > >anymore.
>
> Some 'fests are better than others for this sort of thing...
>
> There are a number of vendors who don't have too large a minimum order (or t
yp.
> a $5 surcharge if under)....  I have used Mouser Electronics and DigiKey and
> find them very good.  Another I have used is Hosfelt Electronics (been a
> while).
>
> Other possibilities (includes surplus vendors): DC Eclectronics, Marlin P.
> Jones, All Electronics, Cumminications Concepts Inc., MCM Electronics, C & H
> Sales.   _Woody_
>
>
> --
> de  Woody (WB4QXE) -  [e-mail]
> Electron Microscopist/Microanalysist,
> Ham radio "homebrewer", shade tree mechanic,
> '90 Nissan 240SX, wish still had my Mcycle too!
> http://www.geocities.com/capecanaveral/3722
> .

The ARRL Handbook (any recent issue) has address for parts suppliers who
will honor small orders. Chapter 30 of the 1996 edition. Also there is a
list at the following site:

http://oak.oakland.edu:8080/pub/hamradio/arrl/bbs/general/parts.txt

Although this is a fairly old list (1991) it will give a starting point
for address, etc. I have personally dealt with All Electronics, Jameco,
Mouser, JAN Crystal, Amidon, RADIOKIT and others and have had generally
good luck. The only problem with some suppliers such as Mouser is the
cost is generally quite high but you can find just about anything you
need.

GL es 73s,
Don, K5DW (ex AA5IE)


From [e-mail] Sat Nov 16 17:23:40 1996
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From: [e-mail] (ThE_BoY)
Newsgroups: rec.radio.amateur.homebrew
Subject: need help building a extremely low power 931.2125mhz transmitter
Date: Thu, 14 Nov 1996 06:57:35 GMT
Organization: ThE_BoY.NET
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Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Howdy all..  Kc7qzr from Washington again..

I have been toying with the idea of converting my pager to ham bands,
but at the moment dont want to spend the dough to get a new board for
it..

Instead  for experimenting with my pager, i would like to build a
931.2125mhz transmitter.  (The Freq of my pager) and i have
transmitter software for my pager...

I have a 2 meter transmitter built, it uses a external mic for my
htx-202 handheld, midified with a 9 pin serial cord pluged into com1..
the program asks for my pagers id, then asks for the numeric message,
then sends it via the com port, to the mic, it clicks the ptt,
transmits the packet, and releases the ptt..  works great from what i
can see..  BUT..  My pager is still in the 900mhz freq..

Any help would be MOST appreciated!!

btw my pager is a motorola renegade..

ALSO!!  I am looking for another pager!  any numeric or alphanumeric
pager..  Dont need any documentation for it if you dont have it.  Just
need the pager, looking for a few of them for modification on
different freq;s and bands..  May start a amateur paging service for
the local hams..

THANKS A MILLION!!!!


Brad
kc7qzr

[e-mail]



From [e-mail] Sat Nov 16 17:23:43 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED mod for adi 2 meter radio !!
Date: Sat, 09 Nov 1996 18:41:08 GMT
Organization: j%nki~wÇRJ3M-26XPLZ8L-BFGD44CT-1EA6BC82
Lines: 2
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From [e-mail] Sat Nov 16 17:23:43 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED mod for adi 2 meter radio !!
Date: Sat, 09 Nov 1996 18:41:51 GMT
Organization: j%nki~wÇRJ3M-26XPLZ8L-BFGD44CT-1EA6BC82
Lines: 2
Message-ID: <562j9a$[e-mail]>
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From [e-mail] Sat Nov 16 17:23:44 1996
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From: Madjid VE2GMI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED mod for adi 2 meter radio !!
Date: Wed, 06 Nov 1996 21:39:16 -0500
Organization: ORION Microsystems
Lines: 8
Message-ID: <[e-mail]>
References: <55jquj$[e-mail]>
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[e-mail] wrote:

Why would anyone answer you sir, you are asking a question
via an anonymous remailer.

Wakarimaska Fuji San? kokko arimasen!

Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri


From [e-mail] Sat Nov 16 17:23:45 1996
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From: [e-mail] (Dale Wentz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need plans for 6 meter CW for beacon
Date: 11 Nov 1996 13:57:41 GMT
Organization: me myself and I
Lines: 9
Message-ID: <567bcl$[e-mail]>
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Could point me to a 6 meter cw transmiter with a power output of about 5 watts
.
I am getting ready to put a beacon up, but dont want to use my allmode.


Thanks
de KB9JJA/Dale
[e-mail]
[e-mail]



From [e-mail] Sat Nov 16 17:23:46 1996
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From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need plans for 6 meter CW for beacon
Date: 12 Nov 1996 17:36:56 GMT
Organization: IT
Lines: 21
Message-ID: <56acjo$[e-mail]>
References: <567bcl$[e-mail]>
NNTP-Posting-Host: 128.163.120.82
X-Newsreader: WinVN 0.92.6

In article <567bcl$[e-mail]>, [e-mail] (Dale Wentz) sa
ys:
>
>Could point me to a 6 meter cw transmiter with a power output of about 5 watt
s.
>I am getting ready to put a beacon up, but dont want to use my allmode.
>
>
>Thanks
>de KB9JJA/Dale
>[e-mail]
>[e-mail]
>
Check out RC (remote control) equipment. There are simple (1 transistor
with crystal control) transmitters around.  I picked one up at a flea
market for next to nothing (like $1.00).  Some of them use the same
circuit board and you wind different coils/transformers on the same
forms.  After all, 72MHz is not that far from 50MHz.  The Tx's are
"digital AM" (in mine a 1[anything over 2v] turns the TX on and anything
below that turns it off).  I use a single chip ider and can either
use the output to key the TX with CW, or from the same cpu get a 1khz
sqaure wave to "AM" the Tx. (The 1KHZ is only there during a dit or dash)
Good hunting


From [e-mail] Sat Nov 16 17:23:47 1996
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From: [e-mail] (ThE_BoY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need schematics for 2 meter amp!!! Help new ham!!!
Date: Thu, 14 Nov 1996 06:49:07 GMT
Organization: ThE_BoY.NET
Lines: 32
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Howdy all,  Kc7qzr from Washington here....

I am still new to hamin, just got my ticket 5-17-96..!!

the only radio i have is a handheld ratshack, htx 202 2 meter ..

Its a good little radio, and i bought a external 1/4 wave antenna for
it so i can use it in my truck to talk on and make autopatch calls..
it works good.  but i need more than 5 watts...

Can someone help me out..  I need Very Plain Jane Schematics here..  I
want to go down to radio shack, buy the needed parts and build a 2
meter amp..  If someone out there can help me out with some schematics
in a very simple readable format, or can just send me what you got,
and i'll get some other ham's in the area to help me with the
schematics i would REALLY appreciate it!!

Please help!!

Brad

kc7qzr  Washington..

p.s.  I would just go buy radioshacks 35 watt amp, but its 100$ and i
dont have it!  and i want to learn how to do home brew stuff, so i may
as well experiment a little and get my hands dirty with the nice
sodering gun i bought 8-)

THANKS AGAIN!!!!!

email is [e-mail]



From [e-mail] Sat Nov 16 17:23:49 1996
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From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need schematics for 2 meter amp!!! Help new ham!!!
Date: 14 Nov 1996 19:24:45 GMT
Organization: Netcom
Lines: 42
Message-ID: <56frlt$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hou-tx19-09.ix.netcom.com
X-NETCOM-Date: Thu Nov 14  1:24:45 PM CST 1996

In <[e-mail]> [e-mail]
(ThE_BoY) writes:
>
>Howdy all,  Kc7qzr from Washington here....
>
>I am still new to hamin, just got my ticket 5-17-96..!!
>
>the only radio i have is a handheld ratshack, htx 202 2 meter ..
>
>Its a good little radio, and i bought a external 1/4 wave antenna for
>it so i can use it in my truck to talk on and make autopatch calls..
>it works good.  but i need more than 5 watts...
>
>Can someone help me out..  I need Very Plain Jane Schematics here..  I
>want to go down to radio shack, buy the needed parts and build a 2
>meter amp..  If someone out there can help me out with some schematics
>in a very simple readable format, or can just send me what you got,
>and i'll get some other ham's in the area to help me with the
>schematics i would REALLY appreciate it!!
>
>Please help!!
>
>Brad
>
>kc7qzr  Washington..
>
>p.s.  I would just go buy radioshacks 35 watt amp, but its 100$ and i
>dont have it!  and i want to learn how to do home brew stuff, so i may
>as well experiment a little and get my hands dirty with the nice
>sodering gun i bought 8-)
>
>THANKS AGAIN!!!!!
>
>email is [e-mail]
>
Ramsey has a 2 meter 35 watt amp kit, I don't recall the cost.  I built
one for a friend who brought it over, and it seemed to work OK, but I
didn't test it much.

I don't know if they have a web page or not, maybe someone else can
help.



From [e-mail] Sat Nov 16 17:23:49 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.mci.com!ss2.cs.mci.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED: plans or schematics for a digital repeater. i need to build a newer controller!. all extras too.
Date: Sat, 09 Nov 1996 18:41:28 GMT
Organization: j%nki~wÇRJ3M-26XPLZ8L-BFGD44CT-1EA6BC82
Lines: 2
Message-ID: <562j8k$[e-mail]>
NNTP-Posting-Host: 207.79.46.43
X-Newsreader: Forte Agent .99c/32.126





From [e-mail] Sat Nov 16 17:23:50 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!data.ramona.vix.com!news1.digital.com!news.bbnplanet.com!su-news-hub1.bbnplanet.com!news.sgi.com!news-out.microserve.net!news-in.microserve.net!not-for-mail
From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: newbee help: How to match a 50 ohm line to a whip on a cordless phone?
Date: 13 Nov 1996 14:30:51 GMT
Organization: Your Organization
Lines: 4
Distribution: world
Message-ID: <56cm2r$8cp$[e-mail]>
NNTP-Posting-Host: sl27.cyberia.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

How do you match impedances from a cordless phone whip antenna to a 50 ohm
line?  Any help would be greatly appreciated.  Thanks.
73 de N3SPD  Tyler



From [e-mail] Sat Nov 16 17:23:51 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.sgi.com!news-out.microserve.net!news-in.microserve.net!not-for-mail
From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: newbee help: What is RIT and VFO?
Date: 13 Nov 1996 14:29:03 GMT
Organization: Your Organization
Lines: 7
Distribution: world
Message-ID: <56clvf$8cp$[e-mail]>
NNTP-Posting-Host: sl27.cyberia.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Although I've been a ham for a while, I don't have any HF gear and am
wondering what an RIT control is on the front of some rigs?  Also, my Allied
communications receiver has an RCA plug on the back with the letters VFO above

it.  Is this Variable Frequency Oscillator?  If it is, what is it used for
exactly?  Any help would be greatly appreciated.  Thanks
73 de N3SPD  Tyler



From [e-mail] Sat Nov 16 17:23:52 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dispatch.news.demon.net!demon!the-symposium.demon.co.uk!Mandy
From: Mandy Wright <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Noise-Cancelling mic.
Date: Sat, 9 Nov 1996 00:25:37 +0000
Organization: Radio Services
Lines: 41
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: the-symposium.demon.co.uk
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MIME-Version: 1.0
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X-Newsreader: Turnpike (evaluation) Version 3.01 <vPIC5CuyknR3CUk2Urj2HsHwi2>

In article <Pine.SUN.3.91.961105123821.22155A-
[e-mail]>, "Richard Gunn;G7UDG" <[e-mail]>
writes
>Can anyone pls help??  I am looking for a **small** noise-cancelling mic.
>to be used inside a (motorbike) crash-helmet.  Where may I obtain one of
>these from and for how much (UK!!!)
>
>Also, some form of PTT that is cheap - not the one I would like to get
>(the one the Police use on their bikes!) - but a cheap alternative!!!
>
>Many thanks,
>
>=============================================================================
==
> _    G7UDG     Internet: [e-mail]         <-- University
>|_)
>| \ichard      Internet: [e-mail]    <-- Home
>-----------------------------------------------------------------------------
--
>  Please reply to university as main address (mail read daily where possible)
>         Home addresses get read on most weekends, and during holidays
>=============================================================================
==
The Electret capsule used for hands-free operation of a mobile phone (it
clips on the sun-visor) can be obtained as a replacement from any mobile
radio workshop (2-way).  Get the one with holes in the top _and_ a ring
of holes around the body, half way down. To power it make simple 4 volt
smoothed zennered supply for a couple of milliamps.  Feed live mic lead
(+) via 2k2-6k8 from supply, and take AF output via 0.047u blocking
capacitor.  Neg is ground.
They cost about ú5, we've used this method. Output is about 10mv/600ohm.
PTT switch: use waterproof microswitch moulded in epoxy fixed to
handlebars with a couple of cable ties.  Suggest you use very light
weight cable to connect headset and boom mic so it breaks easily if you
and the bike part company!     ;-)

Hope this helps
Mandy
(Typing on behalf of my husband Tim who hates computers
despite being a practising RF Engineer!  I know _nothing_ about RF!!)
Sussex
UK                Please note the NEW ADDRESS!

Turnpike evaluation. For Turnpike information, mailto:[e-mail]


From [e-mail] Sat Nov 16 17:23:53 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news1.mnsinc.com!usenet
From: [e-mail] (Brian Carling)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Old tube CW rigs: NETS!
Date: Tue, 12 Nov 1996 10:38:02 GMT
Organization: Monumental Network Systems
Lines: 56
Distribution: inet
Message-ID: <569ufl$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news1.epix.net rec.radio.amateur.homebrew:21062 rec.radio.shortwave:88489

Hi - I thought some of you fellers might enjoy listening in or joining in on
these nets:
Forwarded message:
===================
Send reply to:    [e-mail]
From:             Conard Murray <[e-mail]>
To:               Multiple recipients of list <[e-mail]>
Subject:          BA/GB net hoopla!

Hi radio fans!
It was a busy Monday night on 3579.5! The band is in excellent condition
with trans-contenental DX between
NA4G in North Carolina runnig a Heath HW16 and N7TM in Washington state
running a Drake 2C/2NT combo.
Also worked were several stations dropping by for the first time. Stations
on were:

KC5TJG/Geo in Wichita Falls, Texas
W5FRS/Dennis in Texas running a great sounding TCS (look ma, no chirp!)
W5TVW/Sandy in New Orleans running a SR150 into a Henry amp (WWL's second
cousin!)
N2CQR/Bill in Va running a Halli HT37/Drake 2B
VA3RP/Rod in Ontario running a Heath DX60B
NA4G/Bob in NC with a Heath HW16
N7TM/Tom in WA running a Drake 2C/2NT combo
K4MSG/Paul in Va running (classified)
AF4K/Bry in MD running (classified)
WS4S/Conard in TN running HB 6V6->6Y6/R-390A
Also heard calling but not worked was K7FJ.

How about some of you BA/GB ops in exotic DX-lands (KH6/KL7 etc.) make some
schedules with us
for a late-night session so we can work you with our flea-power rock
crushers?

If you want to get in some great CW time with an excellent group of
operators, here is your chance.
Come up on 3579.5 after dark with whatever you can find that radiates a
signal. Wait until someone
turns it over to another op and send your call. With the onset of decent
propagation on 80, even
5 or 10 watts will do fine.
73 all,
de Conard, WS4S

Conard Murray  WS4S  NNN0UTN   Glowbugs Listowner
217 Dyer Avenue                BA/GB net 1802.5/3579.5/7050 KHz
Cookeville, Tn  38501          [e-mail]
615-526-4093                   Wise men still seek Him
=========================================

73 from Amateur Radio AF4K  /  G3XLQ
http://www.mnsinc.com/bry
E-mail:  [e-mail]
Home of MEGALIST ham radio files, pirate links etc. etc.



From [e-mail] Sat Nov 16 17:23:54 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news.magicnet.net!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!Rezonet.net!altitude!usenet
From: Madjid VE2GMI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB Designing at high Frequency
Date: Sat, 09 Nov 1996 13:10:40 -0500
Organization: ORION Microsystems
Lines: 49
Message-ID: <[e-mail]>
References: <55pmfd$[e-mail]>
NNTP-Posting-Host: dynamicppp-178.hip.cam.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)

Ford A R wrote:
>
> hi!
>
> I'm a naive newbie and i would really appreciate it if someone could
> direct me to, say, a WWW page or a FAQ on designing electronic circuits
> that involve high frequency RF applications (i.e greater than 200,300Mhz
> up to the 2Ghz Range)
>
> I've heard that a tequnique called "strip lining" is used. Can anyone
> explain that to me (I'm probably making an idiot of myself asking these
> questions)
>
> I know that circuits dont abey "normal" laws when there are high frequency
> RF signals involved, adn since i only know about the "normal" rules I'm
> completely i the dark when it comes to designing for higher frequency RF.

In the 1/2 Ghz and above PCB lines of a certain width, length
etc (including dielectric Cte of PCB substrate) behave as
Xmission lines/Reactance and you can design all sorts of
funny looking circuits with tracks going nowhere which are
tuned circuits, stubs etc... even gaps in the PCB become
circuits at microwaves (Slots).

QST presented years ago a technique using isolated wires
placed on a PCB to simulate microstrips. The insulation
acted as dielectric but the wires were connected to the
circuit (at least on one end!). Never tested the technique
but seemed very simple to implement. Microstrips can be
done with PCB layout tape and etching and "tuned"
with Xacto :)

TXLINE from AWR is a freebee showing how these "lines"
are designed. ->  http://www.appwave.com/

There is also a good presentation of microstrip antennas
at: http://www.rfmicrowave.com

Check the following article
-> http://www.rfmicrowave.com/library/trends/aperture.htm

It will give you some insight on what can be done with
Microstrips :)

They had a freeware called PCCAD to design all sorts
of microstrip/striplines/patch&slots antennas but I can't
find it anymore on their site.

Madjid VE2GMI


From [e-mail] Sat Nov 16 17:23:55 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!uunet!in1.uu.net!nntp.inet.fi!news.sci.fi!usenet
From: [e-mail] (Paul KeinΣnen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB Designing at high Frequency
Date: Sun, 10 Nov 1996 11:26:56 GMT
Organization: Scifi Communications International, http://www.sci.fi/, [e-mail], (931)3186277
Lines: 15
Message-ID: <564e5r$[e-mail]>
References: <55pmfd$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ccxliv.adyn.sci.fi
X-Newsreader: Forte Free Agent 1.0.82

Madjid VE2GMI <[e-mail]> wrote:


>QST presented years ago a technique using isolated wires
>placed on a PCB to simulate microstrips. The insulation
>acted as dielectric but the wires were connected to the
>circuit (at least on one end!). Never tested the technique
>but seemed very simple to implement.

Does anybody remember which year this was presented or any other
information to help to limit the search for this article ?

Paul OH3LWR




From [e-mail] Sat Nov 16 17:23:56 1996
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From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB Designing at high Frequency
Date: Thu, 14 Nov 1996 18:43:04 -0500
Organization: ORION Microsystems
Lines: 28
Message-ID: <[e-mail]>
References: <55pmfd$[e-mail]> <[e-mail]> <564e5r$[e-mail]>
NNTP-Posting-Host: dynamicppp-109.hip.cam.org
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Paul Kein=E4nen wrote:
> =

> Madjid VE2GMI <[e-mail]> wrote:
> =

> >QST presented years ago a technique using isolated wires
> >placed on a PCB to simulate microstrips. The insulation
> >acted as dielectric but the wires were connected to the
> >circuit (at least on one end!). Never tested the technique
> >but seemed very simple to implement.
> =

> Does anybody remember which year this was presented or any other
> information to help to limit the search for this article ?

Hi Paul,

Forced me to go through my pile of old QSTs :)

The Article was published in QST July 1981
"Wire Line - a new and easy Method of Microwave
circuit construction" 2 pages only
by KL7ISA Robert Wilson and Hal Silvermann W3HWC

-------------------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows


From [e-mail] Sat Nov 16 17:23:57 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!math.ohio-state.edu!jussieu.fr!oleane!in2p3.fr!swidir.switch.ch!surfnet.nl!news.unisource.nl!halley.pi.net!news
From: Adriaan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: pcb designing programme's ?
Date: Sun, 10 Nov 1996 23:53:30 -0800
Organization: Planet Internet
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: 145.220.205.16
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01E-PI-16  (Win16; I)

Hello,

Where can i find a good pcb designing programme for the pc ?


Cuagn, Adriaan
                                              ////
                                             (o o)
----------------------------------------ooOO--(_)--OOoo--
VHF DX AmateurRadio Station                 PE1KHP JO22XE
Home site           http://home.pi.net/~adpe1khp/home.htm
Pakect Radio                                pe1khp@pi8apd
---------------------------------------------------------
        Use 70cm, don't give it to the CB-boys
---------------------------------------------------------
Member of the dutch radioclub Veron (IARU), member of VHF
commitee and chair-man of the local-club Apeldoorn
---------------------------------------------------------


From [e-mail] Sat Nov 16 17:23:58 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.ultranet.com!data.ramona.vix.com!news1.digital.com!pa.dec.com!crl.dec.com!news-ext.crl.dec.com!bloom-beacon.mit.edu!howland.erols.net!vixen.cso.uiuc.edu!qualcomm.com!usenet
From: Joe Carey <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: pcb designing programme's ?
Date: Mon, 11 Nov 1996 12:59:30 -0700
Organization: QUALCOMM, Inc
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: jcarey-nt.qualcomm.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (WinNT; I)
To: Adriaan <[e-mail]>

Adriaan wrote:
>
> Hello,
>
> Where can i find a good pcb designing programme for the pc ?
>
>

I've used Protel Easytrax at home quite successfully.
It is available for free from Alberta Printed Circuits at

http://www.apcircuits.com

It is old, and kind of clunky by today's standards, but
works fine for most home-type projects.

Joe


From [e-mail] Sat Nov 16 17:23:59 1996
From: [e-mail] (Christer Johansson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: pcb designing programme's ?
Date: Mon, 11 Nov 1996 21:25:02 GMT
Organization: HTH
Reply-To: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
X-Newsreader: Forte Free Agent 1.1/32.230
NNTP-Posting-Host: 193.12.111.72
Lines: 19
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in1.uu.net!nntp.inet.fi!news.funet.fi!newsfeed.sunet.se!news01.sunet.se!sunic!mn6.swip.net!seunet!news2.swip.net!news.buller.se!193.12.111.72

Hi Adriaan,

Adriaan <[e-mail]> wrote:

>Where can i find a good pcb designing programme for the pc ?

Take a look at Ivex products, you can download a shareware
version (max 100 pin) from their site at www.ivex.com...

Regards,

/Christer

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon  -  Christer Johansson  -  E-mail: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax PIC och BASIC STAMP produkter i Skandinavien *
     >>  World Wide Web On-Line Catalog - http://www.hth.com  <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


From [e-mail] Sat Nov 16 17:24:00 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!ais.net!noc.van.hookup.net!nic.mtl.hookup.net!rcogate.rco.qc.ca!altitude!usenet
From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: pcb designing programme's ?
Date: Mon, 11 Nov 1996 18:51:36 -0500
Organization: ORION Microsystems
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dynamicppp-48.hip.cam.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)
To: Adriaan <[e-mail]>

Adriaan wrote:
>
> Hello,
>
> Where can i find a good pcb designing programme for the pc ?

CIRCAD Demo:
http://oak.oakland.edu:8080/pub/hamradio/arrl/bbs/programs/ccdemo.zip


> ---------------------------------------------------------
> Member of the dutch radioclub Veron (IARU), member of VHF
> commitee and chair-man of the local-club Apeldoorn
> ---------------------------------------------------------

Apeldorn that is Philips headquarters No?

------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows




From [e-mail] Sat Nov 16 17:24:01 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in1.uu.net!netnews.nwnet.net!news-hub.interserv.net!news.sprynet.com!news
From: "Cajun 'Net Crusier" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.scanner
Subject: Plans for Homebuilt Scanner?
Date: 9 Nov 1996 06:21:25 GMT
Organization: Sprynet News Service
Lines: 7
Message-ID: <01bbce06$32725560$[e-mail]>
NNTP-Posting-Host: hd70-248.compuserve.com
X-Newsreader: Microsoft Internet News 4.70.1155
Xref: news1.epix.net rec.radio.amateur.homebrew:20935 rec.radio.scanner:70234

I would like to build a simple scanner that tunes the major modes (FM, AM,
SSB?) on any frequency. Any ideas or plans?

Thanks!

PLease EMAIL me your answers.



From [e-mail] Sat Nov 16 17:24:02 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!news.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.space,rec.radio.swap,sci.electronics.equipment
Subject: PTS 160 MHz Synthesizers 4 sale
Date: 9 Nov 1996 15:05:50 GMT
Organization: www.mindspring.com/~wave
Lines: 38
Message-ID: <5626ke$[e-mail]>
NNTP-Posting-Host: user-168-121-20-253.dialup.mindspring.com
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I have a copuple of PTS synthesizers for sale. These units are the 160 MHz
version. Here are some of the specs:

Frequency range         .100 000 MHz to 159.999 999 MHz
Resolution              1 Hz to 100KHz in decades
Accuracy                1 x 10^-8/day +/- 1 x 10^-6/0 - 50 C
Control                 Local by 10 position dial; remote by ttl level
parallel entry BCD or GPIB

Switching time          20 to 5 microseconds
Output level            +3 to 13 dBm (metered in dBm and volts)
Flatness                +/- 0.5
Impedance               50 ohms
Harmonics               -40dBc
Discrete spurs          -75dBc

Phase Noise             -63 dBc (0.5 Hz to 15 KHz) incl. effects of
internal STD
                        100Hz/105dBc, 1KHz/115dBc, 10KHz/123 dBc,
100KHz/127 dBc
Noise Floor             -135 dBc/Hz
External drive          10 MHz or 5 MHz (internal TCXO included)
Weight                  35 Lbs
Mounting                Rack chassis

I have scanned images of the price sheet and specs/picture sheet. These
are available upon request. These units sell new (with all the included
options) for over $8000. I am selling them for $500. They all have minor
cosmetic scratches but are in full working condition. If interested please
e-mail me at:

Pieter Ibelings
N4IP
[e-mail]

73's
Thanks



From [e-mail] Sat Nov 16 17:24:03 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in3.uu.net!news.u-net.com!news
From: [e-mail] (Mike Stirling)
Newsgroups: rec.radio.amateur.homebrew
Subject: Pye M290 low band PMR (UK)
Date: Sat, 09 Nov 1996 15:44:47 GMT
Organization: Mr Stirling
Lines: 8
Message-ID: <5628uc$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tandm.u-net.com
X-Newsreader: Forte Free Agent v0.55

Does anyone have a circuit diagram of any of the Pye M290 series PMR
radios that they could E-Mail me, or know where I could get one from?

Thanks.

/\/\ike




From [e-mail] Sat Nov 16 17:24:03 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!usenet.eel.ufl.edu!warwick!ral!usenet
From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pye M290 low band PMR (UK)
Date: Mon, 11 Nov 1996 13:47:07 +0000
Organization: Rutherford Appleton Laboratory, Oxon, UK
Lines: 11
Message-ID: <[e-mail]>
References: <5628uc$[e-mail]>
NNTP-Posting-Host: bradman.te.rl.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (Win95; I)

Mike Stirling wrote:
>
> Does anyone have a circuit diagram of any of the Pye M290 series PMR
> radios that they could E-Mail me, or know where I could get one from?
>
> Thanks.
>
> /\/\ike

Try HRT. Getting a circuit will be difficult except from Pye service
centres.


From [e-mail] Sat Nov 16 17:24:04 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!nntp.inet.fi!news.csc.fi!nokia.fi!ntc.nokia.com!news
From: Clive <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pye M290 low band PMR (UK)
Date: Thu, 14 Nov 1996 12:58:50 -0800
Organization: Nokia Group
Lines: 21
Message-ID: <[e-mail]>
References: <5628uc$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pc-ousbey.ntc.nokia.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; I)

Mike Willis wrote:
>
> Mike Stirling wrote:
> >
> > Does anyone have a circuit diagram of any of the Pye M290 series PMR
> > radios that they could E-Mail me, or know where I could get one from?
> >
> > Thanks.
> >
> > /\/\ike
>
> Try HRT. Getting a circuit will be difficult except from Pye service
> centres.


Hi,
I disagree with getting service data for Pye PMR sets, they are often
available at radio rallies, I got one for the M296 that way for 5 pounds.

Clive
G0CHO


From [e-mail] Sat Nov 16 17:24:05 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!fu-berlin.de!unlisys!news.maz.net!news.ppp.net!blackbush.xlink.net!freinet.de!news
From: [e-mail] (Joerg Krause)
Newsgroups: rec.radio.amateur.homebrew
Subject: Q: Had anybody test the manchester Modem ???
Date: 8 Nov 1996 11:31:41 GMT
Organization: ITT Intermetall Semiconductors
Lines: 13
Distribution: world
Message-ID: <55v5mt$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: freiburg.itt-sc.de


Salve,

I have found at http://lois.kud-fp.si/hamradio/packet.html a packet model call
ed
"Manchester Modem' from S53MV

had anybody build such a modem ??????


Joerg





From [e-mail] Sat Nov 16 17:24:06 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!wits.uni.net.za!ru.uni.net.za!uct.uni.net.za!iafrica.com!not-for-mail
From: Richard Weideman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Radar : Circuit Diagrams for building my own
Date: Sun, 10 Nov 1996 20:06:15 +0200
Organization: Realtime
Lines: 25
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 196.7.2.69
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.01Gold (Win95; I)

I would like to build my own pulsed radar for a personal tracking
project.

I am trying to find a source for circuit diagrams, or a kit I can
assemble/cannabilise, or any other assistance.

My design constraints are:

- to be used to track a corner reflector made of aluminized foil -
(mylar)
- corner reflector cube side size limit is between 1 to 2 inches / 2.5
to 5 cm
- radar range is to cover an area 150 x 150 yards / 140 x 140 metres

- the radar will be used to track the distance of the corner reflector
only
- the device will need to output elapsed time between "ping" and "echo"
- no display is required
- time output feed will be fed into a PC for processing
- 3 radar devices will be used to determine location by triangulation

If anyone can give me some pointers I'd be most appreciative.

Thanks
Richard


From [e-mail] Sat Nov 16 17:24:07 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!arclight.uoregon.edu!feed1.news.erols.com!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!metro!metro!wabbit.its.uow.edu.au!news
From: Daniel S Nixon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Radar Thesis Project
Date: Fri, 08 Nov 1996 10:35:23 +1000
Organization: University of Wollongong, NSW, Australia.
Lines: 7
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ppp13.cc.uow.edu.au
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; I)

I'm interested in building a doppler radar or radar speed gun as a
thesis project, using a PC for signal processing.  Does anyone have any
ideas on where I could find information for such a project on the Web.

Thanks in advance

Dan.


From [e-mail] Sat Nov 16 17:24:08 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!news.deltanet.com!news.deltanet.com!jlundgre
From: [e-mail] (John Lundgren)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,sci.electronics.misc,alt.electronics.analog.vlsi,rec.radio.amateur.homebrew
Subject: Re: reference for make a device folowing a radio signal
Followup-To: rec.radio.amateur.antenna,rec.radio.amateur.misc,sci.electronics.misc,alt.electronics.analog.vlsi,rec.radio.amateur.homebrew
Date: 15 Nov 1996 00:03:58 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 44
Message-ID: <56gc1e$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: delta1.deltanet.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news1.epix.net rec.radio.amateur.antenna:31572 rec.radio.amateur.misc:118197 sci.electronics.misc:17299 rec.radio.amateur.homebrew:21098

Eric Gagnon ([e-mail]) wrote:
: I want to make some device able to folow radio signal in 1/4 mile

: distance


: if the signal is backward the receiver lit LED backward

: if the signal is forward the receiver lit LED foward

: if the signal is from left lit left LED

: and the same for right.



: some people know how to make that device.

: or where can i find a documentation on this?



: Somebody say is a doppler RDF receivers.

I said that it's a doppler RDF receiver.  I also said that the newsgroup
to find more information is the rec.radio.amateur.homebrew or similar
ham newsgroup.


: Tanks for rapid respond.

--
#===================================================================#
|    John Lundgren - Elec Tech - Info Tech Svcs. |    jlundgre@     |
|    Rancho Santiago Community College District  |   deltanet.com   |
|     17th St at Bristol \ Santa Ana, CA 92706   | http://www.rancho|
| My opinions are my own, and not my employer's. |    .cc.ca.us     |
|   Most FAQs are available through Thomas Fine's WWW FAQ archive:  |
|http://www.cis.ohio-state.edu:80/hypertext/faq/usenet/FAQ-List.html|
|     "Babe Ruth struck out 1,330 times...  keep on swinging."      |
|     says the lid on the jar of Laredo & Lefty's Picante Salsa     |
!  You MAY NOT use my email address for unsolicited Email or lists! !
#======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#



From [e-mail] Sat Nov 16 17:24:09 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!super.zippo.com!zdc-e!feed1.news.erols.com!phase2.worldnet.att.net!netnews.worldnet.att.net!uunet!in2.uu.net!ott.istar!istar.net!n3ott.istar!news.quebectel.com!root
From: Eric Gagnon <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,sci.electronics.misc,alt.electronics.analog.vlsi,rec.radio.amateur.homebrew
Subject: reference for make a device folowing a radio signal
Date: Thu, 14 Nov 1996 20:05:30 -0500
Organization: Quebec Telephone
Lines: 29
Message-ID: <[e-mail]>
NNTP-Posting-Host: sie-182-16.sie.qc.ca
Mime-Version: 1.0
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Xref: news1.epix.net rec.radio.amateur.antenna:31595 rec.radio.amateur.misc:118214 sci.electronics.misc:17315 rec.radio.amateur.homebrew:21111

I want to make some device able to folow radio signal in 1/4 mile

distance





if the signal is backward the receiver lit LED backward

if the signal is forward the receiver lit LED foward

if the signal is from left lit left LED

and the same for right.



some people know how to make that device.

or where can i find a documentation on this?



Somebody say is a doppler RDF receivers.



Tanks for rapid respond.


From [e-mail] Sat Nov 16 17:24:10 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!southwind.net!usenet
From: [e-mail] (Mike Foley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: roller inductor where ?
Date: 11 Nov 1996 11:55:03 GMT
Organization: Your Organization
Lines: 14
Message-ID: <56746n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ppp0.hit.net
X-Newsreader: WinVN 0.91.6

In article <[e-mail]>,
[e-mail] (Fabrizio MODINA) says:
>
>Hi All!
>I`m looking for address of dealer or producer a roller inductor to
build a
>tuner for hf bands.
>Thanks
>
>73 de IK1VCF
>
>I have had a lot of luck getting stuff like that at Surplus Sales of
Nebraska.  Advertised in QST.  Omaha, Neb.  402-346-4750.  Gud Luck,
Mike NV0Y.


From [e-mail] Sat Nov 16 17:24:11 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!usenet.eel.ufl.edu!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!southwind.net!usenet
From: "Chuck V." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematic Cordless Phone Needed
Date: 13 Nov 1996 16:34:03 GMT
Organization: SouthWind Internet Access, Inc.
Lines: 9
Message-ID: <01bbd180$639133a0$9c7435ce@cvest>
NNTP-Posting-Host: port116156.terranet.net
X-Newsreader: Microsoft Internet News 4.70.1155

    I am looking for a schematic for a Northwestern Bell Excursion Sport
Phone..
Model Number: 38000     Man.Date C0787A  Serial 77004269
    I am also looking for a part for it or information on a replacement for
it.
    It is    TD62602

     Thanks ...Chuck...
     e-mail [e-mail]


From [e-mail] Sat Nov 16 17:24:12 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!tezcat!news.sprintlink.net!news-chi-8.sprintlink.net!news.onramp.net!usenet
From: Dave Hills <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematic entry, Board layout, and/or Autorouting Software
Date: Fri, 15 Nov 1996 08:48:12 -0600
Organization: DH Associates
Lines: 28
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: r29p15.onramp.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 3.0 (Win95; I)

Joseph M. Zawodny wrote:
>
> Hi,
>
>         Thanks for reading this.  I'm looking for Schematic entry, Board
> layout, and/or Autorouting Software for the PC.  I have access to the
> real tools (Cadence, OrCAD,...) here at work but I want something
> affordable for personal use at home. SPICE based simulations would be a
> plus but are not required.  Actually I would not mind several different
> packages if they all worked reasonably well individually and I could
> easily trasfer files between them.  Bottom line, I'd like to hear what
> folks out there are using that is reasonably priced (I'm not going to
> spend $14K for OrCAD at home no matter how much I like it or feel the
> price is reasonable).  So, keep the dicussion focussed to "low price"
> software please.



Try *WinDraft* and *WinBoard* from "Ivex". http://www.ivex.com  They are
*shareware*, downloadable, reasonably priced, and quite good.  $30 each
for 220 pin version.  Low cost upgrades for additional pins which you
can purchase by phone.

--
Dave Hills, P.E.
DH Associates
[e-mail]



From [e-mail] Sat Nov 16 17:24:13 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!news
From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Sola Transformer #71807 needed
Date: 14 Nov 1996 15:40:36 GMT
Organization: Netcom
Lines: 13
Message-ID: <56fehk$[e-mail]>
NNTP-Posting-Host: hou-tx11-06.ix.netcom.com
X-NETCOM-Date: Thu Nov 14  9:40:36 AM CST 1996

I have decided to put together some of my junk into a CW transmitter
for Straight Key Night, as well as the Morrow's I plan to use.

I found a fairly healthy transformer, a Sola model 71807, which has HV
windings.  I have never seen a Sola with HV before.  Does anyone have
the ratings of this transformer, I also still have the oil capacitor
that matches it.

Is this a good choice for a HV supply, It looks a lot better than the
old Zenith TV transformers I have.

Thanks in advance
Glenn Sparks   KI5GY


From [e-mail] Sat Nov 16 17:24:14 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!news.bconnex.net!news.abs.net!aplcen.apl.jhu.edu!night.primate.wisc.edu!newsspool.doit.wisc.edu!news.doit.wisc.edu!news
From: [e-mail] (Melissa & Jim)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
Subject: Re: some questions about PIN diode switches
Date: Sat, 09 Nov 1996 04:03:08 GMT
Organization: University of Wisconsin, System Administration
Lines: 28
Message-ID: <560vpt$[e-mail]>
References: <habi.847111559@bauv111> <[e-mail]> <55r90p$[e-mail]> <[e-mail]>
NNTP-Posting-Host: f181-164.net.wisc.edu
X-Newsreader: Forte Free Agent 1.0.82
Xref: news1.epix.net rec.radio.amateur.misc:117844 rec.radio.amateur.homebrew:20924 sci.electronics.design:25120 sci.electronics.components:14152

[e-mail] (Jeroen BELLEMAN) wrote:

>This PIN diode is used as an RF switch, not a rectifier.  It's
>forward biased to close the switch.  Now, even though the level of
>RF voltage may be such that the diode is reverse biased for part of
>the RF period, you don't want the diode to block.  Hence, the
>storage time must be (much) greater than half an RF period.

>Another key spec of PIN diodes used as RF switches is the junction
>capacitance in the off-state, which should be suitably low.

Okay, this makes some sense, even though I'm not completely convinced.
It seems like if we believe that we need enough stored charge to carry
us through some part of the reverse half cycle, then as the frequency
goes up (and the period goes down) and as long as we assume that the
currents drawn are "the same," then LESS stored charge should be
required at higher voltages.

I think we're still missing something here.

Jim
   ---------------------------------------------------------------------
       Melissa Kepner                                    Jim Adney
       [e-mail]              [e-mail]
                             Laura Kepner-Adney
                             Madison, Wisconsin
   ---------------------------------------------------------------------



From [e-mail] Sat Nov 16 17:24:15 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!guitar.sound.net!news
From: DENNIS AND CONNIE BAKER <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
Subject: Re: some questions about PIN diode switches
Date: Sat, 09 Nov 1996 21:21:03 -0800
Organization: Sound Advice Limited's over worked and underpaid news service.
Lines: 6
Message-ID: <[e-mail]>
References: <habi.847111559@bauv111> <[e-mail]> <55r90p$[e-mail]> <[e-mail]> <560vpt$[e-mail]>
NNTP-Posting-Host: max5-178.sound.net
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I beleive that you will find that they bias these diodes to be
conductive  thourgh out the RF cycle.

Dennis

KE0QM


From [e-mail] Sat Nov 16 17:24:15 1996
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.design,sci.electronics.components
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!EU.net!CERN.ch!psas01!jeroen
From: [e-mail] (Jeroen BELLEMAN)
Subject: Re: some questions about PIN diode switches
X-Nntp-Posting-Host: psas01.cern.ch
Message-ID: <[e-mail]>
Sender: [e-mail] (USENET News System)
Organization: CERN, European Laboratory for Particle Physics
References: <habi.847111559@bauv111> <55r90p$[e-mail]> <[e-mail]> <560vpt$[e-mail]>
Date: Mon, 11 Nov 1996 10:14:42 GMT
Lines: 12
Xref: news1.epix.net rec.radio.amateur.misc:117984 rec.radio.amateur.homebrew:21003 sci.electronics.design:25348 sci.electronics.components:14253

In article <560vpt$[e-mail]>,
Melissa & Jim <[e-mail]> wrote:

>I think we're still missing something here.

There's a FAQ about unusual diodes on the web. Take a look at:

http://www.avtechpulse.com/faq.html/

Best regards,
Jeroen Belleman
[e-mail]


From [e-mail] Sat Nov 16 17:24:16 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!netcom16.netcom.com!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: TDR unit from December "Electronics Now"
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.homebrew
Sender: [e-mail]
Organization: at home, in Oakland
Distribution: us
Date: Mon, 11 Nov 1996 02:43:34 GMT
Lines: 4

If anyone does a PC board for the little TDR signal generator in the
December "Electronics Now" page 58, I'd like one.  It's almost not
worth it, but....
73, doug


From [e-mail] Sat Nov 16 17:24:17 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: TDR unit from December "Electronics Now"
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]>
Date: Wed, 13 Nov 1996 01:11:34 GMT
Lines: 11
Sender: [e-mail]

in <[e-mail]>, Doug Faunt N6TQS [phone]
 wrote:
: If anyone does a PC board for the little TDR signal generator in the
: December "Electronics Now" page 58, I'd like one.  It's almost not
: worth it, but....

If you really want some resolution, try the pulse generator in
"Fast Pulser Scope Calibrator" in the October 1996 issue.  That
one does have a kit.

Mark Zenier  [e-mail]  [e-mail]



From [e-mail] Sat Nov 16 17:24:18 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!mackrel.fishnet.net!usenet
From: Mike <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: transverter
Date: Fri, 08 Nov 1996 16:50:32 -0800
Organization: Fishnet Internet Services
Lines: 4
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: port004.scv.fishnet.net
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Riccardo, try TEN TEc, Inc. They have a wide variety of transverter kits
for various frequencies. P# 1 423 428-7172. They also have a web page,
but I can not find where I wrote the URL down.
Good luck, 73, Mike K6YPB


From [e-mail] Sat Nov 16 17:24:19 1996
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From: [e-mail] (Bea and Marvin Jones)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TRIPLE OF BRUGES
Date: 13 Nov 1996 22:49:50 GMT
Organization: Rocky Mountain Internet - (800) 900-RMII
Lines: 16
Message-ID: <56djae$[e-mail]>
References: <01bbd153$4ac780e0$[e-mail]>
NNTP-Posting-Host: rainbow.rmii.com
X-Newsreader: TIN [version 1.2 PL2]

Wim Moerman ([e-mail]) wrote:
: The Triple of Bruges (De Brugse Tripel), a beer of the brewery De Gouden
: Boom (The Golden Tree) was awarded the Great Golden Medal 96 from the
: International Institute for Quality Selections.

Clueless in cyber-land.

: For reactions please contact me on
: [e-mail]

Don't tempt me.

Besides, I've got no time.  There's all that banality over in
rec.radio.amateur.misc yet to read....

Jonesy W3DHJ


From [e-mail] Sat Nov 16 17:24:20 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!feed1.news.erols.com!howland.erols.net!EU.net!Belgium.EU.net!news
From: "Wim Moerman" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: TRIPLE OF BRUGES
Date: 13 Nov 1996 16:11:45 GMT
Organization: International Consulting
Lines: 16
Message-ID: <01bbd153$4ac780e0$[e-mail]>
NNTP-Posting-Host: 193.74.111.2
X-Newsreader: Microsoft Internet News 4.70.1155

The Triple of Bruges (De Brugse Tripel), a beer of the brewery De Gouden
Boom (The Golden Tree) was awarded the Great Golden Medal 96 from the
International Institute for Quality Selections.

The brewery received the award during a session of the jury in Lisbon,
Portugal.

The jury praised the rich bouquet of the beer as well as its excellent
composition.

The jury based its decision not only on taste, but also on laboratory
anlysis, which gives the contest an objective character.

For reactions please contact me on
[e-mail]



From [e-mail] Sat Nov 16 17:24:21 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!feed1.news.erols.com!howland.erols.net!nntp.crl.com!news.titan.com!usenet
From: [e-mail] (Bill Bennett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TRIPLE OF BRUGES
Date: Fri, 15 Nov 1996 18:34:17 GMT
Organization: Titan Information Systems
Lines: 31
Message-ID: <56id3a$[e-mail]>
References: <01bbd153$4ac780e0$[e-mail]>
NNTP-Posting-Host: moe.bc.tisc.titan.com
X-Newsreader: Forte Free Agent 1.0.82

"Wim Moerman" <[e-mail]> wrote:
in the usegroup rec.radio.amateur.homebrew
                               ^^^^^
>The Triple of Bruges (De Brugse Tripel), a beer of the brewery De Gouden
>Boom (The Golden Tree) was awarded the Great Golden Medal 96 from the
>International Institute for Quality Selections.          ^^^^^^^^^^^
Does this make Amateur radio an olimpic sport??

>The brewery received the award during a session of the jury in Lisbon,
>Portugal.
Was the jury deciding somthing about the WARC 97 confrence:

>The jury praised the rich bouquet of the beer as well as its excellent
>composition.
Does this mean the jurry has decided its safe to drink and contest?


>The jury based its decision not only on taste, but also on laboratory
>anlysis, which gives the contest an objective character.
When i drink it usually comes out the same color to.

>For reactions please contact me on
>[e-mail]

Or maby he had to much brew before making this posting  8^>
Im sure it was a simple mistake, as was this reply
Bill
Kc6yox





From [e-mail] Sat Nov 16 17:24:22 1996
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From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: TS-870S general coverage transmit - how?
Date: 12 Nov 1996 19:28:27 GMT
Lines: 24
Message-ID: <56aj4r$[e-mail]>
NNTP-Posting-Host: cna0952843.dseg.ti.com
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Xref: news1.epix.net rec.radio.amateur.equipment:42234 rec.radio.amateur.homebrew:21051

Anyone have a mod to enable general coverage transmit on the TS-870S?

No, I don't plan to use it on CB!  I want to use it as an RF signal
generator.  I've done this with past Kenwoods (TS-430, 440, 850).

It's easy.  Connect a dummy load, crank the RF Output and Carrier pots
all the way down, select AM mode, and dial up your desired frequency.
Voila... a nice stable carrier on the desired frequency, with 10 Hz
readout!  Need modulation?  Add some (but keep the gain real low).

So... any help on this?

--
Dean W. Hemphill                      Email: [e-mail]
PO Box 328                            Home:  [phone]
Lake Dallas, Texas 75065-0328         Work:  [phone]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amateur radio operator KC5NG, Extra Class, VE (ARRL/W5YI), QRPer, CW op
Ford Mustang enthusiast ('66 coupe, '69 GT-350, '72 conv, '95 GT conv)
Die-cast model car collector (Ford products only, in all scales)
Plastic model car builder (Ford products only, 1:24 and 1:25 scale)
Glass insulator collector (specializing in "oddball" pieces)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



From [e-mail] Sat Nov 16 17:24:23 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!surfnet.nl!sun4nl!baan.nl!Utrecht.NL.net!knoware.nl!usenet
From: Jerome Grimminck <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted : Diagrams of 23 Cm ATV Receivers (Home Brew)
Date: Thu, 07 Nov 1996 20:13:42 +0100
Organization: Gate & Co !
Lines: 19
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: huisie-ppp1.knoware.nl
Mime-Version: 1.0
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Hi Om ...

I'am looking for some good schematics for an Home Brew 23 Cm ATV
receiver.
The most important is that it has an narrow bandwith (15 Mhz)
I dont want to use any sat receivers but want to build it on my own.

If you have / know something please let me know.

--
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
<               Kiting comes to you like an affliction,              >
*                  And leaves you like an Addiction.                 *
<                                                                    >
* J.Grimminck : [e-mail]                                    *
< Finaly its here : http://www.dru.nl/users/fright/kites/kites.html  >
* But still under heavy construction ......                          *
+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*



From [e-mail] Sat Nov 16 17:24:25 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!data.ramona.vix.com!news1.digital.com!decwrl!enews.sgi.com!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!surfnet.nl!news.unisource.nl!xs4all!xs4all!usenet
From: [e-mail] (johan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted : Diagrams of 23 Cm ATV Receivers (Home Brew)
Date: Tue, 12 Nov 1996 06:39:46 GMT
Organization: XS4ALL, networking for the masses
Lines: 34
Message-ID: <5686f2$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ztm03-00.dial.xs4all.nl
X-XS4ALL-Date: Mon, 11 Nov 1996 22:39:46 MET
X-Newsreader: Forte Free Agent 1.0.82

Jerome Grimminck <[e-mail]> wrote:
hi
there is a good design in cq-dl of 11/89
a bit old maybe but it works fine
the way it works ?
a vco hand controld
mixed down to 65 MHz
ne564 as pll fm detector
and a tda120 for the audio detection
if you want narrow banthwith you can control that whith the filter and
the detector (the pll )
so happy homebrew
[e-mail]
>Hi Om ...

>I'am looking for some good schematics for an Home Brew 23 Cm ATV
>receiver.
>The most important is that it has an narrow bandwith (15 Mhz)
>I dont want to use any sat receivers but want to build it on my own.

>If you have / know something please let me know.

>--
>*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
><               Kiting comes to you like an affliction,              >
>*                  And leaves you like an Addiction.                 *
><                                                                    >
>* J.Grimminck : [e-mail]                                    *
>< Finaly its here : http://www.dru.nl/users/fright/kites/kites.html  >
>* But still under heavy construction ......                          *
>+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*





From [e-mail] Sat Nov 16 17:24:26 1996
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From: "David \"Scott\" Coburn" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: article from february 1977 "Ham Radio" magazine
Date: Tue, 12 Nov 1996 14:31:06 -0500
Organization: Brookhaven National Laboratory, Upton, NY, USA
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: gorzarg5.phy.bnl.gov
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I would like to get a copy of the February 1977 issue of "Ham Radio"
magazine.  Does anyone have one they would like to get rid of?  Or,
could someone make a copy of the article "Fixed-Frequency Receiver for
WWV" from the issue and send it to me?

Thanks,

Scott

--
scott coburn                              brookhaven national laboratory
mailto:[e-mail]                                      upton, ny, usa
http://gorzarg5.phy.bnl.gov/~scott                      (on long island)


From [e-mail] Sat Nov 16 17:24:27 1996
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From: "David \"Scott\" Coburn" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: references to WWV receiver projects
Date: Tue, 12 Nov 1996 14:39:34 -0500
Organization: Brookhaven National Laboratory, Upton, NY, USA
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: gorzarg5.phy.bnl.gov
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (X11; U; SunOS 4.1.3_U1 sun4c)

I am looking for references to WWV receiver projects.  Articles,
circuits
in books, etc.  If anyone has actually built such a beast and would like
to chat about it that would be great also.  I know you can buy radio-
clocks that do this (WWVB...), but I'm in this for the learning
experience.

Thanks much,

Scott

--

scott coburn                              brookhaven national laboratory
mailto:[e-mail]                                      upton, ny, usa
http://gorzarg5.phy.bnl.gov/~scott                      (on long island)


From [e-mail] Sat Nov 16 17:24:28 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!realtime.net!news
From: Charles Wenzel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED: references to WWV receiver projects
Date: Wed, 13 Nov 1996 22:49:00 -0800
Organization: Real/Time Communications Internet customer posting
Lines: 4
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: jake-4g.ip.realtime.net
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You can make a great WWV receiver by combining a converter and an auto
radio. Auto radios are well shielded and make great IFs for homemade
shortwave receivers. There is a schematic in our technical library at
www.wenzel.com.


From [e-mail] Sat Nov 16 17:24:29 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!shore!news
From: [e-mail] (Winfield Hill)
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 9 Nov 1996 13:00:36 GMT
Organization: The Rowland Institute for Science
Lines: 12
Message-ID: <561v9k$[e-mail]>
References: <54rrtb$[e-mail]> <[e-mail]> <5526q8$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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[e-mail],  <[e-mail]> said...
>
> Suppose your supply voltage is Vcc, and you biased the collector
> at Vcc/2.   [snip math]   the gain is: -q Vcc/2kT!
> no collector resistor dependence...

And to summarize, for the case of biasing at V/2, the gain is 20 V.
This is a nice number to commit to memory.

--
Win



From [e-mail] Sat Nov 16 17:24:30 1996
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From: [e-mail] (Winfield Hill)
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 11 Nov 1996 17:02:25 GMT
Organization: Rowland Institute for Science
Lines: 28
Message-ID: <567m71$[e-mail]>
References: <54rrtb$[e-mail]> <[e-mail]> <5526q8$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <561v9k$[e-mail]> <567cca$[e-mail]>
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Jaafar Mejri at [e-mail] says...
>
>[e-mail] (Winfield Hill) wrote:
>>[e-mail],  <[e-mail]> said...
>>>
>>> Suppose your supply voltage is Vcc, and you biased the collector
>>> at Vcc/2.   [snip math]   the gain is: -q Vcc/2kT!
>>
>>And to summarize, for the case of biasing at V/2, the gain is 20 V.
>>This is a nice number to commit to memory.
>
> what about this: (Bipolar transistors only) the gain is
> A= g_m * R_c = I_c / U_t * R_c
> The maximum value of I_c * R_c is Vcc resulting in:
> A_max = Vcc / U_t, so for 12 v Vcc
> you can get a maximal amplification of nearly 500.
>
> comments?

Exactimundo.  For biasing the output at V/2 you have G= V*20 = 240,
and if you use the entire 12V for the load resistor (almost but not
quite saturating the BJT amplifier), you get G = 500.

--
Winfield Hill      [e-mail]
Rowland Institute for Science
Cambridge, MA 02142



From [e-mail] Sat Nov 16 17:24:31 1996
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From: Jaafar Mejri <[e-mail]>
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 11 Nov 1996 14:14:34 GMT
Organization: LRS Uni Erlangen
Lines: 24
Message-ID: <567cca$[e-mail]>
References: <54rrtb$[e-mail]> <[e-mail]> <5526q8$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <561v9k$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:21010 rec.radio.swap:94713 sci.electronics.design:25365 sci.electronics.misc:17150

[e-mail] (Winfield Hill) wrote:
>[e-mail],  <[e-mail]> said...
>>
>> Suppose your supply voltage is Vcc, and you biased the collector
>> at Vcc/2.   [snip math]   the gain is: -q Vcc/2kT!
>> no collector resistor dependence...
>
>And to summarize, for the case of biasing at V/2, the gain is 20 V.
>This is a nice number to commit to memory.
>
>--
>Win
>

what about this: (Bipolar transistors only)
the gain is A= g_m * R_c = I_c / U_t * R_c
The maximum value of I_c * R_c is Vcc resulting in:
A_max = Vcc / U_t, so for 12 v Vcc you can get a maximal amplification of
nearly 500.

comments?

Jaf.



From [e-mail] Sat Nov 16 17:24:33 1996
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From: Jaafar Mejri <[e-mail]>
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: 12 Nov 1996 09:41:56 GMT
Organization: LRS Uni Erlangen
Lines: 8
Message-ID: <569gp4$[e-mail]>
References: <54rrtb$[e-mail]> <[e-mail]> <5526q8$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <561v9k$[e-mail]> <567cca$[e-mail]> <567m71$[e-mail]> <[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:21022 rec.radio.swap:94763 sci.electronics.design:25397 sci.electronics.misc:17163

altavoz <[e-mail]> wrote:

>altavoz:  U_t  ?
U_t = kT/q ( in the range of: 25 mV at room temp!)


JaF.



From [e-mail] Sat Nov 16 17:24:34 1996
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From: altavoz <[e-mail]>
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Subject: Re: What is the maximum gain that you can get out of a transist
Date: Mon, 11 Nov 1996 21:21:46 -0800
Organization: worldnet.att.net
Lines: 39
Message-ID: <[e-mail]>
References: <54rrtb$[e-mail]> <[e-mail]> <5526q8$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <561v9k$[e-mail]> <567cca$[e-mail]> <567m71$[e-mail]>
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To: Winfield Hill <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.homebrew:21030 rec.radio.swap:94801 sci.electronics.design:25431 sci.electronics.misc:17176

Winfield Hill wrote:
>
> Jaafar Mejri at [e-mail] says...
> >
> >[e-mail] (Winfield Hill) wrote:
> >>[e-mail],  <[e-mail]> said...
> >>>
> >>> Suppose your supply voltage is Vcc, and you biased the collector
> >>> at Vcc/2.   [snip math]   the gain is: -q Vcc/2kT!
> >>
> >>And to summarize, for the case of biasing at V/2, the gain is 20 V.
> >>This is a nice number to commit to memory.
> >
> > what about this: (Bipolar transistors only) the gain is
> > A= g_m * R_c = I_c / U_t * R_c
> > The maximum value of I_c * R_c is Vcc resulting in:
> > A_max = Vcc / U_t, so for 12 v Vcc
> > you can get a maximal amplification of nearly 500.
> >
> > comments?
>
> Exactimundo.  For biasing the output at V/2 you have G= V*20 = 240,
> and if you use the entire 12V for the load resistor (almost but not
> quite saturating the BJT amplifier), you get G = 500.
>
> --
> Winfield Hill      [e-mail]
> Rowland Institute for Science
> Cambridge, MA 02142




altavoz:  U_t  ?




______End of text  from altavoz___________


From [e-mail] Mon Nov 25 19:04:50 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Marcus Ramos)
Newsgroups: rec.radio.amateur.homebrew
Subject: Hybrids and Gunnplexer Video ckt - HELP!
Date: 10 Nov 96 18:53:37 GMT
Organization: ucsd usenet gateway
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I got a SHW5042 hybrid from an "crashed" Motorola trunk radio. No data for
this
component even at the Design-net (Motorola homepage). In one catalog I only
found some case information, but no electrical caracteristics.
Any Idea? May be a MHW5042(not found too)?
I need information on PF0031 hybrid too!

Other subject: I'm looking for schemactics on video amplifier with
pre-emphasis
(CCIR 525 lines, i.e. NTSC video). I did one using a FET, some RC network
and
calibrated it using a domestic satellite receiver, 18MHz IF filter and a
modified
Ku band LNB. The transmitter is a 10mW Gunnplexer(MAcom). May be the CCIR
curve too). The idea is not to have a domestic TVRO de-emphasis as a
reference.
The circuit was calibrated with a multiburst TV signal and looks OK but...

Thanks in advance.
Marcus Ramos, PY3CRX
[e-mail]
Homebrewing ATV, 902, 1296, 2304, 10250, Digital Video codecs, HRPT,
GOES/METEOSAT/NOAA APT ....



From [e-mail] Mon Nov 25 19:04:51 1996
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From: [e-mail] (Ed Stagl)
Newsgroups: rec.radio.amateur.homebrew
Subject: test
Date: 10 Nov 96 21:46:44 GMT
Organization: ucsd usenet gateway
Lines: 2
Message-ID: <19961110214642.AAA2102@LOCALNAME>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Do not read.  This is a test.



From [e-mail] Mon Nov 25 19:04:53 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news1.best.com!newshub.sdsu.edu!news.sgi.com!su-news-hub1.bbnplanet.com!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!vixen.cso.uiuc.edu!uwm.edu!homer.alpha.net!news
From: John Phillips <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: I have a R&D project and need an Elmer!
Date: Wed, 13 Nov 1996 05:23:19 -0800
Organization: Alpha.net -- Milwaukee, WI
Lines: 23
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X-Mailer: Mozilla 2.01KIT (Win16; U)

My other hobby is model rocketry and I have been flying 25 summers now,
and in the winter I turn to ham radio. I would like to pull out the gear
in the summer too and need the help of a Elmer.  A little background
first:
The National Association of Rocketry has contests through out the USA.
Models that go the hightest, stay in the air the longest, scale models,
and the like are how we compete. The hightest points awarded are for the
R&D competion. I would like to marry ham radio and rocketry in my R&D
project this year.  Many have done so before, like ATV, real-time video,
RDF, altimeters, etc... No one has ever work a R&D project for ground
based equipment. I would like to have a wireless launch system.  Many,
many, many problems with a system like this. Safety would be number one.
(You wouldn't want any stray RF to activate the launch system when you
hooking up the rocket motor!) I need a "Elmer" to help me with this
project.  I don't have a EE degree, and I can use "off the shelf"
equipment.  So if you think you would be interested in a project like
this let me know.
73 and Clear skies!
John Phillips  N9JXU  NAR # 30039
4221 Village Lane #52
West Des Moines, IA 50266
[e-mail]
[e-mail]


From [e-mail] Mon Nov 25 19:04:54 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!newspump.sol.net!howland.erols.net!newsfeed.internetmci.com!news.wwa.com!news.ucdavis.edu!indigo!mays
From: mays@indigo (Skip May)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can I flash the getter again?
Date: 15 Nov 1996 00:25:35 GMT
Organization: University of California, Davis
Lines: 27
Message-ID: <56gd9v$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: indigo.ucdavis.edu
X-Newsreader: TIN [version 1.2 PL2]

Depends on the tube, depends on the use. It's common to rebuild higher
power tubes and there are companies that do it. Getters do the same basic
thing with various differences per design application. Most cases make it
a one time flash. Sometimes that "flash" is operation in/with a special gas
atmosphere.
A more conventional approach would be to learn more about the various
effects of raising and lowering the fillament voltage. There is an entire
science to the fillament voltage (way to much for this reply) and it's
effects on the operation/emission of the tube. I'm relating this to the
smaller tubes which are not normally rebuilt. I've purchased
rare/expensive tubes and varied the fillament based on the remaining
emission. The tube is still in continous service at it's normal operating
parameters. I just keep a closer eye and tighter controls on it.

Best Luck
Skip May
[e-mail]


Bob Mueller ([e-mail]) wrote:
: If a tube develops gas problems can the getter be once more fired to pick up
: the gas and rescue the tube (assuming it is a type expensive enough to justi
fy
: the effort.)?



:                Bob


From [e-mail] Mon Nov 25 19:04:55 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!news.dra.com!news.he.net!night.primate.wisc.edu!aplcen.apl.jhu.edu!cpk-news-feed3.bbnplanet.com!news.ipass.net![e-mail]
From: "David A. Cooley" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need schematics for 2 meter amp!!! Help new ham!!!
Date: Thu, 14 Nov 1996 23:43:13 -0500
Organization: IPass.net
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: customs13.ipass.net
Mime-Version: 1.0
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To: [e-mail]

ThE_BoY wrote:
>
> Can someone help me out..  I need Very Plain Jane Schematics here..  I
> want to go down to radio shack, buy the needed parts and build a 2
> meter amp..  If someone out there can help me out with some schematics
> in a very simple readable format, or can just send me what you got,
> and i'll get some other ham's in the area to help me with the
> schematics i would REALLY appreciate it!!
>
>
> p.s.  I would just go buy radioshacks 35 watt amp, but its 100$ and i
> dont have it!  and i want to learn how to do home brew stuff, so i may
> as well experiment a little and get my hands dirty with the nice
> sodering gun i bought 8-)

Brad,
I built a single transistor 2M amp a couple years ago... Unfortunately,
the parts alone cost over $100.00 without a case etc... The transistor
was $65.00... Radio shack doesn't even come close to carrying anything
needed for the amp except wire and solder.
You may find a used amp for less than $100.00, but don't count on it...
The ones I have seen were sold before the ink in the ad dried.

Later,
Dave



--
========================================================================
David Cooley N5XMT                  Packet: N5XMT@W4RAL.#RTP.NC.USA.NOAM
Internet: [e-mail]    And Web: http://www.ipass.net/~cooldave/
Sponges grow in the ocean... Wonder how deep it would be if they didn't!
========================================================================


From [e-mail] Mon Nov 25 19:04:56 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!news.mindspring.com!newspump.sol.net!howland.erols.net!nntp.crl.com!nexp.crl.com!usenet
From: Dave Booth <[e-mail]>
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateu
Subject: Re: Club WWW site
Date: Fri, 15 Nov 1996 12:44:22 -0800
Organization: KC6WFS
Lines: 20
Message-ID: <[e-mail]>
References: <01bbd141$bc5224c0$[e-mail]> <56h5cl$[e-mail]>
NNTP-Posting-Host: 165.113.223.131
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 3.0 (X11; U; IRIX 5.3 IP19)
To: Jimmy Navarro <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.antenna:31670 rec.radio.amateur.boatanchors:552 rec.radio.amateur.digital.misc:20134 rec.radio.amateur.dx:1331 rec.radio.amateur.equipment:42500 rec.radio.amateur.homebrew:21164 rec.radio.amateur.misc:118316

Jimmy Navarro wrote:
>
> In article <01bbd141$bc5224c0$[e-mail]>,
> [e-mail] says...
> >
> >This is the Hamtpon Roads Radio Association web site you may be interested
> >in.  We are located in Norfolk Virginia.  Let me know what you think!
> >
> >Eric KE4KIK 73!
> >
> >http://www.infi.net/hrra
> How much do your ISP charge for home page?  I'd like to build a Web site for
> an open repeater club.  73!

Check out http://geocities.com
You can get "free" homepages there!!!
73....
--
Dave Booth kc6wfs
http://www.geocities.com/Hollywood/5860/


From [e-mail] Mon Nov 25 19:04:57 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!nntp.crl.com!news.pbi.net!news.dp.beckman.com!inet.dp.beckman.com!newsmaster
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 70cm PLL projects
Message-ID: <[e-mail]>
From: Don Labriola <[e-mail]>
Date: Fri, 15 Nov 1996 13:24:46 -0800
Reply-To: [e-mail]
References: <55qt5t$[e-mail]>
 <55rpkp$il0$[e-mail]>
Distribution: world
Organization: DDC, Beckman Instruments, Inc.
NNTP-Posting-Host: 134.217.101.126
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (Win16; I)
To: Steven Kerns <[e-mail]>
Lines: 26

Steven Kerns wrote:
>
> Check out the Proceedings of Microwave Update '89, avaliable from
> the ARRL (check out their web page).  Pages 179 - 184 describe a
> 500Mhz to 1Ghz circuit that could be modified (or mixed) to get
> you to the 70cm band.
>
> 73 Steven Kerns N3FTI
>
> In article <55qt5t$[e-mail]>, [e-mail]
> says...
> >
> >
> >Could anyone provide some references to recent construction articles
> >pertaining to 70cm or UHF PLL oscillators?
> >
> >Any tips would be appreciated.
> >
> >tnx de va3rr/aa8lu
You might check out http:\www.natsemi.com and look for their PLLatium
line of PLL's. They go all the way to 2GHz. Application notes might give
a good lead. Most of their parts are available for 1 or 2 samples (right
through their bulletin board). Have fun!

73's de W6QS Don .... No affiliation with Nat Semi. Opinions are my own.
Usually!


From [e-mail] Mon Nov 25 19:04:59 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!fnnews.fnal.gov!news.eng.convex.com!camelot.dsccc.com!sun001.spd.dsccc.com!jmccarty
From: [e-mail] (Mike McCarty)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Date: 15 Nov 1996 22:25:42 GMT
Organization: DSC Communications Corporation
Lines: 29
Message-ID: <56iql6$[e-mail]>
References: <[e-mail]> <[e-mail]> <566aot$[e-mail]> <56f1bi$pp6$[e-mail]>
NNTP-Posting-Host: sun1307.spd.dsccc.com
Xref: news1.epix.net rec.radio.amateur.homebrew:21157 rec.radio.cb:37809 sci.electronics.design:25827 sci.electronics.misc:17403

In article <56f1bi$pp6$[e-mail]>,
tyler <[e-mail]> wrote:
)
)>>The standard varactor FM modulator does not inherently add pre-emphasis,
)>>so an external pre-emphasis network is used to allow PM and FM radios
)
)Being relatively new to this NG, what is pre-and de-emphasis exactly?  I know

)it's used in FM communications, but how and why?  Why is it needed?  FM
)commercial stations use it.  Why?  I'm reading this post on it and I'm kind o
f
)lost.  Any help would be greatly appreciated.  Thanks.
)Tyler
)N3SPD

It is a noise-reduction scheme. Most of the noise in FM systems is what
might be termed "high frequency" or "hiss" (similar to tape). So the
high frequencies are "pre-emphasized" (i.e. get more gain than the lower
frequencies). Then when played back, the high frequencies are
"de-emphasized" (get lower gain). This raises the overall signal/noise
ratio.

Similar schemes are used in tape decks, and on vinyl records (RIAA
equalization, also called 75us equalization). Dolby is a similar scheme.

Mike
--
----
char *p="char *p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}

I don't speak for DSC.         <- They make me say that.


From [e-mail] Mon Nov 25 19:04:59 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!cs.utexas.edu!wotan.compaq.com!twisto.eng.hou.compaq.com!news
From: Monty Wilson <[e-mail]>
Subject: Home made paddles?
Message-ID: <[e-mail]>
Sender: [e-mail] (System Administrator)
Mime-Version: 1.0
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Content-Type: text/plain; charset=us-ascii
Organization: very little
Date: Fri, 15 Nov 1996 22:45:16 GMT
X-Nntp-Posting-Host: monty.pc.hou.compaq.com
Content-Transfer-Encoding: 7bit
Lines: 19

I would like to put together small and inexpensive iambic
paddles for the car.  I use a Brass Racer at the house but
I wanted to see what I could put together myself for mobile
use.  I'm experimenting with double-sided copper PC board
from Radio Shack, but it is very thick and doesn't have
much "flex" to it, so I'm afraid if I proceed with that plan
my hand will become fatigued if I use it long.

I'd like to find some material I could use for switches
that wouldn't take too much force to actuate and could last
many thousands of closures and openings.

Has anyone invented this wheel already?

--
.........Monty.
mwilson @ flex.net (with spaces deleted)




From [e-mail] Mon Nov 25 19:05:00 1996
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From: "Richard F. Gillette" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need schematics for 2 meter amp!!! Help new ham!!!
Date: Fri, 15 Nov 1996 23:03:01 +0000
Organization: RF gillette inc.
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: max02-106.starnetinc.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 3.0 (Win16; I)

Call Communications Concepts, Dayton OH. They have nice kit/s
513-426-8600, ck if they have email, I did not.  W9PE

--
Richard F. Gillette P.E.,   Board Member, Harper C.C.     \\////
RF gillette inc. PO Box 1605, Palatine, IL 60078-1605     ( OO )
[e-mail], v)847-526-2626, f)847-526-2944 oo00=={}==00oo=


From [e-mail] Mon Nov 25 19:05:01 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!portc02.blue.aol.com!portc01.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: New Eimac 4CX250A and Socket
Date: 15 Nov 1996 23:06:29 GMT
Organization: AOL http://www.aol.com
Lines: 7
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com

I have a new in original box Eimac 4CX250a and SK620 socket.

Will sell both for $75 postpaid

Email to

[e-mail]


From [e-mail] Mon Nov 25 19:05:02 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!su-news-hub1.bbnplanet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!portc02.blue.aol.com!portc01.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 6 Meter 100 watt Amplifier Kit
Date: 15 Nov 1996 23:11:05 GMT
Organization: AOL http://www.aol.com
Lines: 12
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com

I still have a few PC boards and parts kits for the 6 Meter 100 watt
amplifier I published in QST in Oct. 1990. Ten watts in , 100 watts out.

Kit includes PC board and all board mounted components, Add a $10 die cast
box, two mini toggle switches, and a heat sink and you choice of RF and
Power Connectors for a 100 watt "Brick for Six"

Kit is $125 postpaid to US and Canada

Pat Bunn, N4LTA

Email [e-mail]


From [e-mail] Mon Nov 25 19:05:03 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!news-out.communique.net!gatech!csulb.edu!hammer.uoregon.edu!arclight.uoregon.edu!news.sprintlink.net!news-peer.sprintlink.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!ifwtech.demon.co.uk!G3SEK
From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3-500Z's - whats the difference?
Date: Sat, 16 Nov 1996 08:12:59 +0000
Organization: IFW Technical Services
Lines: 7
Distribution: world
Message-ID: <$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
X-NNTP-Posting-Host: ifwtech.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 3.01 <9qI82xurdT5+zee3Wovwfh3yMs>

Duncan Clark wrote:
>I am asking on the basis that in the UK we can
>only run 400W PEP output so they don't get run to the hilt.

And we never exceed the speed limit either...   :-)

73 from Ian G3SEK


From [e-mail] Mon Nov 25 19:05:04 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.wco.com!news
From: J&J Mac <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need schematics for 2 meter amp!!! Help new ham!!!
Date: Sat, 16 Nov 1996 08:58:39 -0800
Organization: West Coast Online's News Server - Not responsible for content
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mercury24.wco.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02Gold (Win95; I)
To: [e-mail]

Do you have a FAX number?  I'll fax you a schematic. No scanner on this end fo
r JPG or GIF.

But you can get the Ramsey kit for about $35. It's a 10X Amp with a max out of
 about 35 Watts.  so 1 in may get
you 10 out, 3 to 5 in gets you 30 to 35 out.

I have one and aside for the TX/RX switching the project took me about 25 minu
tes.


Jim..
kb6zop


From [e-mail] Mon Nov 25 19:05:04 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.wco.com!news
From: J&J Mac <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WANT..  Pages 57 thru 64 from Jan 85 , 73 Magazine.
Date: Sat, 16 Nov 1996 09:04:27 -0800
Organization: West Coast Online's News Server - Not responsible for content
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: mercury24.wco.com
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02Gold (Win95; I)

I have this issue but I am missing the plans for the 6 meter project... Please
 if you have this issue,
mail a fellow HB'er a copy of these pages...
Pgs 57 thru 64..   Or just pages 59 and 60.
Thanks in advance..

Jim..
KB6ZOP


From [e-mail] Mon Nov 25 19:05:05 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!oronet!usenet
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna relays
Date: Sat, 16 Nov 1996 18:49:09 GMT
Organization: RST Engineering
Lines: 22
Message-ID: <56l2bl$[e-mail]>
References: <55gpdt$[e-mail]> <55kabp$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (W6KKT Jesse) shared these priceless pearls of wisdom:
->Hi Tom, what timeing would you recommend for the close / open and how
->would the average ham go about achieving it?
->73, Jesse, W6KKT

You say you don't want to use a DPDT relay at the input/output.  Is this
for cost or ease of design?  If the cost of the relay isn't a big deal, use
a DPDT relay with one set of contacts passing DC to the relay you want to
close second.  Then even if the DPDT relay fails, you won't blow up the
whole amplifier because the second relay will never come on.  Of course,
one SET of the contacts on the DPDT could fail and cause catastrophe, but
I'd gamble this way instead of some sort of timing circuit.

Jim


Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1st phone---Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-A&P-FAA Counselor



From [e-mail] Mon Nov 25 19:05:06 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.vol.it!news
From: "Brian E. Cauchi" <[e-mail]>
Newsgroups: alt.ham-radio.digital-voice,es.rec.radio.amateur,fido7.hamradio,rec.radio.amateur,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,su.org.ham
Subject: FAX SSTV RTTY WEFAX with SoundBlaster: OK!
Date: 16 Nov 1996 19:26:21 GMT
Organization: Video On Line
Lines: 41
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Hello.
I've just updated my FTV program, which does FAX & SSTV using a SoundCard,
to decode Baudot using the same (FM) demodulation engine.

Here is a run down of the more interesting features:

(1) It keeps the demodulated signal in memory, so that the signal can be
analysed again at a different keying rate or polarity! Garbage can be
resampled on the fly, which means that minutes of received signals decoded
at the wrong baud rate or keying polarity are recovered, on the fly, while
still receiving.

(2) Keying rate and polarity are analysed automatically - standard baud
rates are automatically set following analysis.

(3) Tuning oscilloscope available at all times, without loss of copy.

(4) Program works in real time.

(5) I wrote it, and I love it - I myself can't believe it works so well!

Download your copy of FTV from my web site, at:
http://www.geocities.com/SiliconValley/2504

System requirements, and the standard features of FTV are described in the
following page:
http://www.geocities.com/SiliconValley/2504/ftv.htm

By the way, AM signals from low orbiting weather satellites are also
decoded - no extra interfaces needed. Demodulation mode is user selectable
in software.


Hope you all have a load of fun receiving 'words and pictures' - I hope to
get some feedback !

All the best from Brian, 9H1JS, on the Island of Malta.





From [e-mail] Mon Nov 25 19:05:08 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!lou.teclink.net!usenet
From: "Tom C. Brown, Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More amplifier stuff
Date: Sat, 16 Nov 1996 13:56:17 -0600
Organization: Madison Materials Company
Lines: 45
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tc3_39.teclink.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; U)

Marijan Miletic wrote:
>
> Tom, W8JI gave my callsign wrongly as S59A and I am the person who thought t
hat
> instantenous plate voltage can never exceed 2 x DC value as my internal mode
l
> was strictly linear which is NOT the case with overdriven but lightly loaded
> tube (or transistor).  I Measure-d my SB-220 and found RF voltages exceeding
 DC
> with antenna shortened.  I almost melted output coax connector but it was wo
rth
> the effort as a new insight into the actual physics was gained.
> Following the claims on some fancy phenomenons from California, I got a feel
ing
> that a gentleman lives close to Hollywood.  Fuse resistors call for outright
> disaster with their "speedy" action.  At least, don't use flamable ones...
> 73 de Mario, S56A, N1YU.
> P.S.  I don't want to get involved in O.J. type proofs from certain letter!




Hi Mario-

I understand what you measured, and I don't dispute your findings at
all.  However, while Tom has been talking about "shorted loads" and that
sort of thing, Rich has been discussing arcs and other misbehavior that
have happened in amps where the antenna was NOT shorted, damaged or
compromised in any way.  And, while the high anode voltage mentioned in
this thread was indeed there, it was with one or more of the tuning
capacitors WAY out of tune, and actually adjusted for max anode voltage.

Once again, this does not dispute Rich's claim.

Rich was talking about an amp arcing and otherwise having problems in a
properly configured system, and while in normal operation.

Measuring the anode voltage under abnormal conditions does not in any
way prove that the same anode voltage exists under normal conditions.

Am I missing something here?

73, Tom KJ5IE


PS:  I say, keep the electronic grid protection and add the carbon "fuse
resistors" if the amp is unstable.  You just can't have too much grid
protection, or tube protection in general.  But, Rich's claim that the
electronic protection may be insufficiently robust for a cataclysmic
failure sounds correct to me.


From [e-mail] Mon Nov 25 19:05:09 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!feed1.news.erols.com!howland.erols.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Jeffrey Maass)
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
Subject: Re: Vibroplex web page up...
Followup-To: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
Date: 16 Nov 1996 15:15:23 -0500
Organization: The Greater Columbus FreeNet
Lines: 24
Message-ID: <56l7cr$[e-mail]>
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References: <[e-mail]> <01bbd34c$838c3600$3900cace@mich
elle>
Distribution:

Mitch, W4OA ([e-mail]) wrote:


: Mitch, WA4OSR <[e-mail]> wrote in article
: <[e-mail]>...
: > The Vibroplex web page is now up at-
: > http://www.vibroplex.com
: >
: > check it out, and give me your feedback...
: >

: oops, gave my wrong email address... correct address is:
: [e-mail]    or
: [e-mail]

: mitch, w4oa

Suggest retail prices for wach of the keys would be nice...
--
Jeff Maass       ([e-mail])      Amateur Radio K8ND
      USPSA/IPSC # L-1192   NROI/CRO          NW of Columbus Ohio


From [e-mail] Mon Nov 25 19:05:10 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!usenet.eel.ufl.edu!arclight.uoregon.edu!feed1.news.erols.com!dciteleport.com!www.nntp.primenet.com!nntp.primenet.com!netcom.com!jimford
From: [e-mail] (JF)
Subject: Re: ARRL IMD MEASUREMENTS??
Message-ID: <328e440e.293683@10.0.2.1>
Sender: [e-mail]
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: Forte Agent .99e/16.227
References: <[e-mail]>
Date: Sat, 16 Nov 1996 22:51:15 GMT
Lines: 21

This is a good question.  I wrote a letter to ARRL with an answer from
the Lab Supervisor Ed Hare.  His answers were that we've always done
it that way and we don't want to get anybody to go ballistic with
changes.  I hope you write a letter to him as well.  My letter showed
where their own publications as well as the commercial world do it
different than they do.  Even an article about measuring Intermod in
QEX didn;t use their method.  You certainly have hit on a sore spot.
Thanks Jim Ford, N6JF  [e-mail]

On Sun, 10 Nov 1996 15:46:10 GMT, [e-mail] (W6KKT Jesse)
wrote:

>
>Does anyone know why when the ARRL labs test, revue and publish IMD
>findings on new transceivers, and linear amplifiers they compare the
>IMD products to the sum of the two tones (PEP output of the two tones
>combined)?  Doing the test this way makes the IMD measurements look
>6db better than what they actually are (compared to commercial
>standards).
>73, Jesse, W6KKT



From [e-mail] Mon Nov 25 19:05:12 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.wwa.com!news
From: [e-mail] (M Simon)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Sun, 17 Nov 1996 07:50:12 GMT
Organization: Space-Time Productions
Lines: 75
Message-ID: <56mg3n$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <55remb$[e-mail]>
NNTP-Posting-Host: 206.230.95.11
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I would say:

   I am sorry I stated your apparent conflict of interest as
fact.

Simon

-------------------------------------------------------------------


[e-mail] (.) wrote:

>In article <01bb739f.8e9f00c0$[e-mail]>,
>   "James S. Kaplan" <[e-mail]> wrote:
>>ARRL lawyer to sue member
>>
>>The following is a copy of a message I received today from
>>ARRL General Counsel Christopher D. Imlay N3AKD:
>>
>>
>>To:       James S. Kaplan, KG7FU
>>Copies:   Mary Lou Brown, NM7N
>>          Terry Baun
>>          John Poray
>>Date:     July 16, 1996
>>Re:       Your article, SBE Chapter 124 Newsletter, July, 1996
>>**************************************************************
>>
>>     Jim, I have just finished reading your article in the July,
>>1996 Water Cooled Newsletter, page 6. In it, you argue that two of
>>my clients, the American Radio Relay League, Inc. and the Society
>>of Broadcast Engineers, Inc. should cooperate in certain government
>>relations projects, specifically spectrum protection. You note that
>>I serve as the General Counsel for both organizations. You then
>>jump from that argument to the following, which I quote:
>>
>>     If Mr. Imlay can't resolve HIS OWN conflicts of interest,
>>     perhaps both ARRL and SBE should be seeking more
>>     effective counsel. No offense Chris, but we have work to
>>     do. We should not only be sending a message to the FCC
>>     and Congress, but to other radio industries.
>>
>>                              (emphasis in original)
>>
>>It is not useful for me to educate you on the subject of your
>>article to correct the errors in it, and I do not intend to do so.
>>What I do intend, however, is for you to print a retraction, in
>>unambiguous terms, in a form acceptable to me, and to furnish to
>>me, in writing, an assurance that such will be printed in the next
>>Chapter Newsletter for Chapter 124. Failing that, I am going to sue
>>you in the District of Columbia for libel.
>>
>>     I have no intention of allowing you to falsely allege that I
>>have a conflict of interest in representing two of my best clients,
>>especially in an SBE publication. You are not entitled to damage my
>>reputation as a lawyer, which you have done in your article, or to
>>infer (without any basis at all) that I have violated the canons of
>>ethics governing attorneys, by which I govern my actions.
>>
>>     I will await your response.
>>
>>Chris Imlay, N3AKD
>>
>Great response! People need to express their thoughts and opinions without th
e threat
>of legal action!

>Dave
>[e-mail]

In the end people get the government they deserve.

Read "The Weapon Shops of Isher" by A.E. vanVogt

Simon



From [e-mail] Mon Nov 25 19:05:13 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!feed1.news.erols.com!news.nl.innet.net!INnl.net!feed1.news.innet.be|INbe.net!news.be.innet.net!INbe.net!user
From: [e-mail] (Thierry Wautelet)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pye M290 low band PMR (UK)
Date: Sun, 17 Nov 1996 08:58:26 +0100
Organization: not that much, I'm afraid
Lines: 29
Distribution: world
Message-ID: <[e-mail]>
References: <5628uc$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pool02a-216.innet.be

In article <[e-mail]>,
Mike Willis <[e-mail]> wrote:

>Mike Stirling wrote:
>>
>> Does anyone have a circuit diagram of any of the Pye M290 series PMR
>> radios that they could E-Mail me, or know where I could get one from?
>>
>> Thanks.
>>
>> /\/\ike

Ypu can try Mauritron Technical Services
           8 Cherry Tree Road
           Chinnor, Oxon, OX9 4QY
Tel : [phone]  Fax:[phone]

They have plenty old manual or copies availble but not cheap.

Or Ham Radio Today.

(BTW, I'm using a MX290 on 2 meter and a M296 on 70cm).

Have a nice day,
Thierry.


Email : [e-mail]
Ham : ON7KL                                           PowerMac User


From [e-mail] Mon Nov 25 19:05:14 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!namesrv.mdc.net!usenet
From: "ashlock" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Low Frequency Reception Boston Area
Date: Sun, 17 Nov 1996 05:00:10 -0500
Organization: NetWay By MDC, Inc.
Lines: 6
Message-ID: <01bbd46e.1e9b35c0$0bf042ce@comp-1>
NNTP-Posting-Host: ppp0011.mdc.net
X-Newsreader: Microsoft Internet News 4.70.1085

Is anyone in the Boston area receiving by 1 watt beacon on 187.55 kHz? The
ID is "WA" and runs continuously.

My signal typically gets out about 50 miles from my home base in Andover,
MA, with good receiving equipment, and favorable conditions.



From [e-mail] Mon Nov 25 19:05:15 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!ifwtech.demon.co.uk!G3SEK
From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL IMD MEASUREMENTS??
Date: Sun, 17 Nov 1996 10:50:21 +0000
Organization: IFW Technical Services
Lines: 75
Distribution: world
Message-ID: <[e-mail]>
References: <5651g2$[e-mail]>
 <[e-mail]>
 <[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
X-NNTP-Posting-Host: ifwtech.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 3.01 <9qI82xurdT5+zee3Wovwfh3yMs>

Gary Coffman wrote:

>>>Because that's the right way to do it.  Unfortunately, right or nor,
>>>it is not the standard way to do it.
>>
>>There is no right way to make a measurement, only a standard way.
>
>I disagree. The right way to make a measurement is the way which
>gives the correct value. Any other way, whether you call it standard
>or not, is the wrong way.

And someone else in turn will disagree with that...

>For example, I could say that the standard
>way to read the static electric field is to hold the probes of a
>VOM in the air. But that would give an incorrect reading of the
>static field, so it is the wrong way to make the measurement.

Now that's true - but it has nothing to do with this discussion. Gary's
example is merely an inaccurate measurement.

This thread is about two measurement methods that are both defined, and
that definition re-stated along with the results: either "X dB below
PEP" or "X dB below either of two equal tones". Measurement accuracy is
a separate issue that applies equally to both methods.

We could continue to discuss which is the "better" or the "more useful"
or the "more appropriate" measurement to make, but neither measurement
is "wrong".


Let's change the subject: how good are two-tone methods anyway?

If we are concerned with the ability of one SSB (voice) user to
interfere with users on nearby frequencies, measurement of exclusively
low-order intermod proucts with static tones is a pretty poor method.

Most amateur reviews (and some professional specifications) concentrate
far too much on low-order products. We usually see reports of 3rds and
5ths with a tone separation of about 1kHz, and maybe a plot out to +/-
10kHz, but that's all.

Wideband splatter is caused by much higher-order IPs than the ones we
usually measure, and published test results don't usually show whether
those IPs drop quickly into the noise or tend to remain at audible
levels over a very wide bandwidth. Also, many transmitter / power-supply
combinations will give quite different IMD performance when allowed to
settle to steady two-tone conditions than when they're being kicked
around by a pulsed two-tone signal or real voice modulation.

You can see a much more realistic picture of spectrum occupancy by
setting a modern spectrum analyser to "peak hold" mode, and leaving it
to run for several minutes of normal voice modulation. What comes out is
an envelope plot of the highest signal levels seen at any time, as a
function of frequency.

Because the voice modulation is wideband rather than single-tone, you
can't see distinct peaks from the separate orders of IPs. The output
looks very much like a noise-sideband plot, a continuous line with a
general downward trend at each side of the main signal. There are
statistical fluctuations because the analyser may not be looking at a
particular frequency when a very short peak occurs, but those errors are
reduced if you run the test for a longer time.

The main virtue of this method is that it simulates on-air use under
much more realistic conditions than a static two-tone test. I don't
think it completely replaces the traditional test method, but it's
certainly a valuable addition to it.

Any comments, please - particularly from somebody who has tried it?

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - world-wide.


From [e-mail] Mon Nov 25 19:05:16 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!news.idt.net!mr.net!news-out.microserve.net!news-in.microserve.net!not-for-mail
From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More amplifier stuff
Date: Sun, 17 Nov 1996 11:05:39 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 11
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: dyn20.frazmtn.com
X-Newsreader: Forte Agent .99e/16.227

On 17 Nov 1996 03:06:56 GMT, [e-mail] wrote:


>An oscillator either oscillates or it doesn't. It doesn't suddenly "ring"
>or "gong" into oscillation. Photons won't suddenly cause a circuit to
>oscillate, neither will keying transcients.

Tom, are you absolutely sure it's impossible for a unstable amplifier
to start into  oscillation intermittently from switching transcients?
73, Jesse, W6KKT



From [e-mail] Mon Nov 25 19:05:18 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!cam-news-hub1.bbnplanet.com!su-news-hub1.bbnplanet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!news.paonline.com!news.paonline.com!wlio!fred.vobbe
From: [e-mail]
Subject: Wanted: Schematic for pjt
Message-ID: <[e-mail]>
Organization: WLIO Television [419.228.8835]
X-Mailer: TBBS/TIGER v1.0
Distribution: world
Date: Sun, 17 Nov 96 10:51:42 -0400
Lines: 32



        Does anyone have any schematics for the old Palomar tube
amplifiers that CBers were using in the 70's?  They were the gray
box, with about 100+ watts out for 5 watts in.

        I would love to get some schematics/diagrams on them, or any
amp in the 100-500 watt class that takes about 5-10 watts to drive.

        Another ham and I are looking to build from scratch an
amplifier for 6 meter use.  We were looking over the ARRL diagrams,
and got on the subject of those amplifers.  I recall a ham in the town
where I lived got one of those amplifiers from a CBer that was getting
out of the hobby in 1976, and was able to modify the input output
tuning for 6 meters, and it worked great.

        I would be glad to trade an official NBC 96 Atlanta Olympics
poster for a set of prints.  I only have 5 left.  These are the 3'x2'
posters they were selling for $19.95.


Fred Vobbe, W8HDU

 +---------------------------------------------------------------+
 |   Frederick R. Vobbe               Editor: DX Audio Service   |
 |   Chief Engineer WLIO TV           National Radio Club, Inc.  |
 |   NBC Channel 35                   Medium Wave DX Listener    |
 |   1424 Rice Ave                    Rptr: 443.625+, 145.370-,  |
 |   Lima, Ohio 45805-1949                  53.630-  pl 100hz    |
 |   Fax: [phone]                Email: [e-mail]      |
 +---------------------------------------------------------------+
___ Blue Wave/QWK v2.12


From [e-mail] Mon Nov 25 19:05:19 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!news
From: [e-mail](MICHAEL J DRUM)
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
Subject: Want Kenwood IF-10D Computer Interface.
Date: 17 Nov 1996 15:14:30 GMT
Organization: Netcom
Lines: 10
Message-ID: <56na4m$[e-mail]>
References: <56l7cr$[e-mail]>
NNTP-Posting-Host: wfd-nj1-07.ix.netcom.com
X-NETCOM-Date: Sun Nov 17  7:14:30 AM PST 1996
Xref: news1.epix.net rec.radio.swap:95578 rec.radio.amateur.antenna:31683 rec.radio.amateur.digital.misc:20140 rec.radio.amateur.equipment:42520 rec.radio.amateur.homebrew:21172 rec.radio.amateur.misc:118328 rec.radio.amateur.policy:43234 rec.radio.amateur.space:8832 rec.radio.amateur.dx:1334

Greetings,

I want to buy a Kenwood IF-10D Computer interface for my TS-60. If you
have one for sale please contact me at my Email address and let me know
the details. I will answer all reply's sent.

Thank You.

Mike>



From [e-mail] Mon Nov 25 19:05:20 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!news
From: [e-mail](MICHAEL J DRUM)
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
Subject: Any mod info for Kenwood TS-60 Transceiver?
Date: 17 Nov 1996 15:19:07 GMT
Organization: Netcom
Lines: 13
Message-ID: <56nadb$[e-mail]>
References: <56l7cr$[e-mail]>
NNTP-Posting-Host: wfd-nj1-07.ix.netcom.com
X-NETCOM-Date: Sun Nov 17  7:19:07 AM PST 1996
Xref: news1.epix.net rec.radio.swap:95579 rec.radio.amateur.antenna:31684 rec.radio.amateur.digital.misc:20141 rec.radio.amateur.equipment:42521 rec.radio.amateur.homebrew:21173 rec.radio.amateur.misc:118329 rec.radio.amateur.policy:43235 rec.radio.amateur.space:8833 rec.radio.amateur.dx:1335


Greetings,

I am looking for any mod info on the Kenwood TS-60 six meter all mode
transceiver. I was unable to get any applicable info from Kenwood's web
site on this transceiver, so I now turn to the internet for help.

Any info would be appreciated. All reply's will be answered.

Thanks.

Mike>



From [e-mail] Mon Nov 25 19:05:20 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in1.uu.net!news.ziplink.net!usenet
From: [e-mail] (PCG #1)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: newbee help: How to match a 50 ohm line to a whip on a cordless phone?
Date: 17 Nov 1996 15:59:19 GMT
Organization: PCG Inc.
Lines: 17
Distribution: world
Message-ID: <56ncon$[e-mail]>
References: <56cm2r$8cp$[e-mail]>
NNTP-Posting-Host: ip68-max4-bos.ziplink.net
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In article <56cm2r$8cp$[e-mail]>, [e-mail] says...
>
>How do you match impedances from a cordless phone whip antenna to a 50 ohm
>line?  Any help would be greatly appreciated.  Thanks.
>73 de N3SPD  Tyler


I usually have the most problem getting the stupid plastic cases open.

The articles that I have seen suggest that you remove the whip from the base,
and replace it with a chassis mounted bnc connector.  You don't have to
worry about impedance matching since power output is so low.  Let us
know how well the external antenna works (how much it improves reception).

Chris
N1AUP



From [e-mail] Mon Nov 25 19:05:22 1996
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From: Raymond Ciaccio <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: car-alarm type transmitters
Date: Sun, 17 Nov 1996 13:36:14 -0500
Organization: MHVNet, the Mid Hudson Valley's Internet connection
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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Douglas Dwyer wrote:
>
> In article <[e-mail]>, "G. Sargent"
> <[e-mail]> writes
> >Hi All,
> >
> >I am trying to find someone who sells car-alarm style remote control
> >transmitters / receivers.
> >
> >My task is to transmit an alarm indication (or, perhaps some data) with
> >a range of approx. 60 feet.
> Farnell and Maplin resell excellent SAW stabilised double superhet
> modules from Radiotek (UK) 250uW at 418/433MHz  range 200 metres.
> Douglas Dwyer Frequency Precision Ltd. Reply via demon or
> [e-mail] phone/fax [phone]
> http://ourworld.compuserve.com/homepages/Frequency_Precision/
>
Try Radio Shack.$200. Expensive but it works. I Have one myself, xmits
on 10 meters and puts out about 4 watts to a pager. The distance of  a
CB radio, (approx).
 Ray


From [e-mail] Mon Nov 25 19:05:23 1996
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From: woody white <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial VHF low radios.  Which ones have easily scavenged PAs for 6 FM ?
Date: Sun, 17 Nov 1996 21:30:54 -0800
Organization: http://www.geocities.com/capecanaveral/3722
Lines: 50
Message-ID: <[e-mail]>
References: <56nd5c$[e-mail]> <[e-mail]>
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Re: GE Amp modules...   Beware of overdirve damage from the TenTec ans
most of the PA strips require about 250 mw of drive.   You could use an
attenuator.... Also there are 50 stripline points between many stages.
Some have a jumper strap in-line.  Just cut (or remove jumper) strip and
feed where the TenTec drive is appropriate.  Woody

Andy Brinkley wrote:
>
> PCG #1 wrote:
> >
> > Greetings fellow home brew mavens.
> >
> > In an effort to populate a new VHF band in the New England area, members o
f our
> > local 2 M repeater society are going to assemble some Ten Tec 6M FM kits a
s a
> > group project.  We have about ten people who are interested.
> >
> > Since the kits possess finals that put out about 5 W, we need to find a 6M
 FM amp
> > kit to accompany these radios.  A fellow ham suggested that many solid sta
te
> > commercial boat anchors have PAs that can easily be removed and adapted fo
r use
> > with these Ten Tec units.  He seemed to think that Micors, and certain oth
er GE
> > units might provide the needed parts, already assembled into an easy to re
move
> > module.
> >
> > Can anyone provide concrete details on exactly what radios could be scaven
ged in
> > this fashion?  We would like to find something that will generate 100 watt
s of output power.
>
> Chris -
> I've never tried it but what you want to do should work.  If you are interes
ted
> I have a number of Motorola Mo-Com 70 42-50 mhz 100 watt mobiles and some GE
> MASTR PRO 42-50 MHZ mobiles FS.
>
> TNX
>
> Andy Brinkley
>
> ***************************************
> "[e-mail]"
> ***************************************
>
> NC Certified Firefighter III / Fire Service Instructor II / EMT-A
> FCC Licensed Technician
> Amateur Call N4ROX

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Mon Nov 25 19:05:24 1996
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From: Cliff Davies <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home made paddles?
Date: Mon, 18 Nov 1996 12:07:31 GMT
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: central.zetnet.co.uk
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In message <[e-mail]>
        Monty Wilson <[e-mail]> writes:

> I'd like to find some material I could use for switches
> that wouldn't take too much force to actuate and could last
> many thousands of closures and openings.

> Has anyone invented this wheel already?

Many times :-)
Try using two micro switches back to back and mounted on a very small
board complete with strap and some 'Velcro', remember seeing it in a
recent QST.

Regards
Cliff GI3HNM








From [e-mail] Mon Nov 25 19:05:25 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: roller inductor where ?
Date: Mon, 18 Nov 1996 06:51:46 -0700
Organization: Internet Access of Ventura County
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]> <56746n$[e-mail]>
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In article <56746n$[e-mail]>, [e-mail] (Mike
Foley) wrote:

> In article <[e-mail]>,
> [e-mail] (Fabrizio MODINA) says:
> >
> >Hi All!
> >I`m looking for address of dealer or producer a roller inductor to
> build a
> >tuner for hf bands.

Variable inductors (up to 40 Amperes), fixed inductors, variable
capacitors:  Multronics @ 516-957-7200, 80 East Montauk Highway,
Lindenhurst, Long Island, N.Y. 11757. Be sure to short the unused turns,
Fabrizio.

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Mon Nov 25 19:05:26 1996
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From: Clif <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
Subject: Re: Any mod info for Kenwood TS-60 Transceiver?
Date: Mon, 18 Nov 1996 08:36:29 -0600
Organization: OnRamp Technologies; ISP;  Dallas/Ft Worth/Houston, TX USA
Lines: 20
Message-ID: <[e-mail]>
References: <56l7cr$[e-mail]> <56nadb$[e-mail]>
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To: MICHAEL J DRUM <[e-mail]>
Xref: news1.epix.net rec.radio.swap:95655 rec.radio.amateur.antenna:31718 rec.radio.amateur.digital.misc:20149 rec.radio.amateur.equipment:42564 rec.radio.amateur.homebrew:21185 rec.radio.amateur.misc:118370 rec.radio.amateur.policy:43252 rec.radio.amateur.space:8839 rec.radio.amateur.dx:1340

MICHAEL J DRUM wrote:
>
> Greetings,
>
> I am looking for any mod info on the Kenwood TS-60 six meter all mode
> transceiver. I was unable to get any applicable info from Kenwood's web
> site on this transceiver, so I now turn to the internet for help.
>
> Any info would be appreciated. All reply's will be answered.
>
> Thanks.
>
> Mike>

There is one technical bulletin and one parts change bulletin out on the
TS-60. There are no mod sheets. What do you want it to do???

Clif
[e-mail]
AVVid is an authorized Kenwood and Icom Service Center


From [e-mail] Mon Nov 25 19:05:27 1996
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From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home made paddles?
Date: 18 Nov 1996 15:13:05 GMT
Organization: Netcom
Lines: 41
Message-ID: <56pue1$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hou-tx16-02.ix.netcom.com
X-NETCOM-Date: Mon Nov 18  9:13:05 AM CST 1996

In <[e-mail]> Monty Wilson
<[e-mail]> writes:
>
>I would like to put together small and inexpensive iambic
>paddles for the car.  I use a Brass Racer at the house but
>I wanted to see what I could put together myself for mobile
>use.  I'm experimenting with double-sided copper PC board
>from Radio Shack, but it is very thick and doesn't have
>much "flex" to it, so I'm afraid if I proceed with that plan
>my hand will become fatigued if I use it long.
>
>I'd like to find some material I could use for switches
>that wouldn't take too much force to actuate and could last
>many thousands of closures and openings.
>
>Has anyone invented this wheel already?
>
>--
>.........Monty.
>mwilson @ flex.net (with spaces deleted)
>
>
I built one a while back, but I haven't used it much. One day I was in
the garage, and noticed the laminage on the edge of the workbench (an
old desk with fake formica top) was peeling off.  I pulled it off and
tried to decide what to do with it, it seemed about the right
flexability for a key, so I picked up some microswitches out of the
junk box with both NO and NC contacts, I glued a piece of 3/8 or so
wood between the pieces of laminate, glued that to a piece of PC board
perfboard, and mounted the two microswitches so the laminate held them
open, and connected the wires to the NC contacts.  I put a piece of
velcro on the bottom, and stuck it to the console.  It seemed OK, but
I'm not spoiled by something like the brass racer, I have a Scotkey
which is interesting, but not that good of a key.  I don't know the
life of the microswitches either.

Good luck, if you come up with a design you might post it.  One group
built a straight key out of hacksaw blades, and published it in QST a
few years ago.

KI5GY  Sparky


From [e-mail] Mon Nov 25 19:05:28 1996
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From: [e-mail] (Richard Herring)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Followup-To: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Date: 18 Nov 1996 15:21:25 GMT
Organization: GEC-Marconi Research Centre
Lines: 23
Message-ID: <56putl$[e-mail]>
References: <[e-mail]> <[e-mail]> <566aot$[e-mail]> <56f1bi$pp6$[e-mail]> <56iql6$[e-mail]>
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Mike McCarty ([e-mail]) wrote:

[snip explanation pre-/de-emphasis used to increase signal/noise ratio]
>Similar schemes are used in tape decks, and on vinyl records (RIAA
>equalization, also called 75us equalization).

For vinyl, the maximum undistorted recording level depends on frequency,
so the RIAA equalization is tailored to reflect that, rather than simply
matching the signal and noise spectra. I thought it was more complex
than the  simple 75 (or 50? depending which ITU region you're in) microsecond
curve generally used for FM?

>Dolby is a similar scheme.

Not really, except that its effect is to increase the S/N ratio -
unlike passive filtering, it works by active compression/expansion of
the signal (either just the high frequencies, or in several bands, depending
on which kind of Dolby you use.)


--
Richard Herring      |  [e-mail] | Speaking for myself
GEC-Marconi Research Centre                      | Not the one on TV.


From [e-mail] Mon Nov 25 19:05:29 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: IMD measurements
Date: 18 Nov 96 15:22:36 GMT
Organization: ucsd usenet gateway
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Ian suggested using a spectrum analyser set to peak hold mode as a
means of getting an indication of what a signal does to its neighbors.

It's funny he should mention that.  I did it just 2 weeks ago.
Unfortunately, I didn't take any quantitative measurements,  I was
just playing around.  I need to put the directional coupler in the
line soon and re-run the tests during a QSO looking out over 100 KHz.
I can then correlate the results to a 2 tone test.

I'll post the results when I have them.

Ray
WD5IFS
[e-mail]



From [e-mail] Mon Nov 25 19:05:30 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!news.sprintlink.net!news-peer.sprintlink.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!uknet!bcc.ac.uk!news
From: James Mills <[e-mail]>
Subject: Microwave Antenna Design
Message-ID: <[e-mail]>
Date: Mon, 18 Nov 1996 16:03:59 GMT
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Lines: 10

Hello Everybody,

Does anybody know of some good software / shareware for microwave
antenna and circuit design for microstrip work.

Regards

Jon Mills

[e-mail]



From [e-mail] Mon Nov 25 19:05:31 1996
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From: Listserv@ucsd (Mailing List Processor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: your LISTSERV request "help lpt cw interface"
Date: 18 Nov 96 17:08:32 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

The mailing list "lpt" could not be found.
You may use the INDEX command to get a listing
of available mailing lists.


From [e-mail] Mon Nov 25 19:05:32 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Jens Goerke)
Subject: Re: Home made paddles?
X-Newsreader: TIN [version 1.2 PL2]
Organization: Private Multi-Site
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Mon, 18 Nov 1996 17:20:18 GMT
Lines: 17

Monty Wilson ([e-mail]) wrote:
> I would like to put together small and inexpensive iambic
> paddles for the car.  I use a Brass Racer at the house but
[...]

How about two microswitches back to back with a piece
of (whatever) in between. Or you could mount the micro-
switches on a T with the handle sticking out. Just
make sure you can operate safely while driving.

Just my $.02,
        Jens, DB9LL
--
at work: [e-mail], [e-mail] (http://barbara.combtx.com/~jg)
at home: [e-mail]
at play: jg@beach, griffin@rpg, db9ll@g-qrp/darc
"You beeped me for WHAT?"


From [e-mail] Mon Nov 25 19:05:33 1996
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From: [e-mail] (William C. Mutch )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home made paddles?
Date: Mon, 18 Nov 1996 14:01:40 -0400
Organization: Cornell University
Lines: 20
Sender: [e-mail] (Verified)
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: bill.ee.cornell.edu

In article <[e-mail]>, Monty Wilson
<[e-mail]> wrote:

> I would like to put together small and inexpensive iambic
> paddles for the car.  {snip, snip}
>
> I'd like to find some material I could use for switches
> that wouldn't take too much force to actuate and could last
> many thousands of closures and openings.
>
> Has anyone invented this wheel already?

      An approuch I saw a long time ago in QST which I tried and liked was
to bolt two regular practice straight keys (J-38's were $1.25 apiece then,
but any practice key would do.) back to back on a piece of 3" aluminium
Tee bar which is then strapped to the transmission hump of the car or
ballasted with a railroad sleeper plate and sat on the seat.  The two
sides of the key are independently adjustable for spacing and tension and
even cheapie keys will hold up for a long time once you get the
adjustments right.  KA1UL


From [e-mail] Mon Nov 25 19:05:34 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!snunews.snu.ac.kr!hammer.uoregon.edu!arclight.uoregon.edu!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!csn!nntp-xfer-1.csn.net!cam-news-feed1.bbnplanet.com!cronkite.xyplex.com!usenet
From: Phil <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low Frequency Reception Boston Area
Date: 18 Nov 1996 18:23:12 GMT
Organization: Xyplex, Inc.
Lines: 8
Message-ID: <56q9ig$[e-mail]>
References: <01bbd46e.1e9b35c0$0bf042ce@comp-1>
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I live in Worcester, MA.

I'll give it a try and get back to you.

How long has it been up?

Phil KA1NHZ



From [e-mail] Mon Nov 25 19:05:35 1996
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From: Bob Berg <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Want: VHF / UHF SWR Meter plans
Date: Mon, 18 Nov 1996 13:23:20 -0500
Organization: Robohand, Inc
Lines: 9
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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hello,
Looking for plans to build a VHF/ UHF  2m-70cm SWR Meter.
up to 50 Watts power handling capabilities.
Does anyone have any plans or know how to build one.  Any information
would be greatly appreciated.
Thanks
N1YCH
Bob Berg
[e-mail]


From [e-mail] Mon Nov 25 19:05:36 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!castle.nando.net!news-out.internetmci.com!peerfeed.internetmci.com!howland.erols.net!surfnet.nl!news.tue.nl!news.IAEhv.nl!news
From: "msimons" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: YIG oscillators home brew?
Date: 18 Nov 1996 18:37:31 GMT
Organization: Internet Access Eindhoven, the Netherlands
Lines: 8
Message-ID: <01bbd588$29793b20$2d4697c2@marc'scomputer>
NNTP-Posting-Host: pm2d12.iaehv.nl
X-Newsreader: Microsoft Internet News 4.70.1155

Hi there RF anthousiasts,

Is anyone aware of the existance of YIG - oscillators? Are there any
surplus components around to make your own? I want to try out something
with it. The surplus HP types still go for over $200 and up. Did someone
try out to make his own? Let me know!

[e-mail]


From [e-mail] Mon Nov 25 19:05:36 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: roller inductor where ?
Date: 18 Nov 1996 19:48:30 GMT
Organization: University of Colorado, Boulder
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In article <[e-mail]>,
R. L. Measures  <[e-mail]> wrote:

> Be sure to short the unused turns,
>

Many articles using air-wound coils direct one to short unused turns,
and you do too.  I see how the voltage would be high at the end, like a
Tesla coil, but it seems like it would also lower the Q, possibly a lot.
Shorting unused turns on an inductor-with-a-core amounts to having a
transformer with a shorted secondary - which is no good!  What
are the pros of shorting turns?  (And how much does it lower Q?)

Bruce
N6URH


From [e-mail] Mon Nov 25 19:05:38 1996
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From: [e-mail] (Rob Frohne)
Newsgroups: rec.radio.amateur.homebrew
Subject: Syncronous Noise Blanker Idea
Date: Mon, 18 Nov 1996 14:42:45 -0700
Organization: Walla Walla College
Lines: 31
Message-ID: <[e-mail]>
NNTP-Posting-Host: hrf.wwc.edu

Hi,

The other day I had an idea.  The idea was for a syncronous noise
blanker.  At home I am plagued by QRN coming from a substation about a
mile north of my QTH.  I've tried SEM's QRM Eliminator (which uses another
antenna to pick up the nearby noise, adds it in with the signal from the
main antenna, and amplitude and phase controls to sum the noise to zero),
but it didn't solve my problem.  I never could get another antenna to pick
up the QRN from a mile away anywhere near as well as my four element
quad.

So anyway, my idea is this:  Assuming the noise is coming from arcing of a
60 Hz source, actually the same 60 Hz source I'm powering my radio on, and
assuming it happens on peaks, then it will happen 120 times a second.  Why
not build a blanker that triggers on the 60 Hz line signal and that has an
adjustable blanking interval time and adjustable delay from the trigger?
Has anyone tried this?  What kind of results were had?

Thanks!

Rob KL7NA/W7

--
Rob Frohne
E.F. Cross School of Engineering
Walla Walla College
204 S. College Ave.
College Place, WA 99324

[e-mail]
http://www.wwc.edu/~frohro


From [e-mail] Mon Nov 25 19:05:39 1996
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From: [e-mail] (Derek Toeppen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need background about Mocom
Date: 18 Nov 1996 22:17:31 GMT
Organization: HP Colorado Springs Division
Lines: 6
Message-ID: <56qn9r$[e-mail]>
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        A friend has come across a hand full of UHF Mocom 70 radios. He asked
if they can be used as repeaters.
        I have worked with Mitreks and Micors but know nothing about Mocoms.
Was wondering if anyone here could fill me in? My first thought is that the
Mocom was the model before the Micor. Is this correct? Do the make a
reasonable repeater? How about a link radio?


From [e-mail] Mon Nov 25 19:05:40 1996
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From: Stephen Dobak <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Folded Dipole
Date: 19 Nov 1996 01:02:56 GMT
Organization: ProLog - PenTeleData, Inc.
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450 ohm line worked file for me, I used 16 gauge stranded conductors
used an electrical 1/2 wave for feed to reflect the antennas
impedance at the shack (450 ohm) and went to a 4-1 to the rig.
Had a 1-1 swr at 1850 and was well under 2-1 across the entire band.
Worked like a champ

--
/-------------\
|Steve Dobak  |
| WB3AMG :-)  |
^^^^^^^^^^^^^^^


From [e-mail] Mon Nov 25 19:05:41 1996
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From: [e-mail] (Jim Potter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wilkinson Combiner or 1/4 Wave Sections ? Opinions ???
Date: Tue, 19 Nov 1996 03:22:12 GMT
Organization: The Santa Fe Institute
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[e-mail] (Jim Potter) wrote:


>I'd recomend you consider a quadrature combiner. I t requires a 90
>degree hybrid in the input and the output, arranged so that the phases
>all add up correctly. The coupler is most easily made from Sage
>Wireline which you can get from Sage Laboratories [phone].
>



OOPS! That was their FAX number. Voice number is 508-653-0844. Sorry
for the confusion.


Jim


James M. Potter, President              TEL: [phone]
JP Accelerator Works, Inc.              FAX: [phone]
2245 47th Street                        EMAIL: [e-mail]
Los Alamos, NM 87544-1604               URL: http://www.jpaw.com



From [e-mail] Mon Nov 25 19:05:42 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: roller inductor where ?
Date: 19 Nov 1996 03:50:40 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
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In article <56qeie$[e-mail]>, [e-mail]
(TIEMANN BRUCE) writes:

>Many articles using air-wound coils direct one to short unused turns,
>and you do too.  I see how the voltage would be high at the end, like a
>Tesla coil, but it seems like it would also lower the Q, possibly a lot.
>Shorting unused turns on an inductor-with-a-core amounts to having a
>transformer with a shorted secondary - which is no good!  What
>are the pros of shorting turns?  (And how much does it lower Q?)
>
>Bruce

There is so much flux leakage in an air wound coil, Q reduction is not
drastic. Especially since without shorting turns both series resonance and
voltage breakdown problems get worse.

You may still have problems at the range above 15 MHz with unwanted series
resonance, even with the unused turns shorted.

73 Tom


From [e-mail] Mon Nov 25 19:05:43 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 19 Nov 1996 03:50:42 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 30
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Message-ID: <[e-mail]>
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In article <[e-mail]>,
[e-mail] writes:

>
>Let's look at a typical suppressor such as the SB-220, AL-80, or SB-1000
>suppressor, since a 3-500Z almost always needs a suppressor in the 100-
>130 MHz area. Will that be ok?
>
>73 Tom

I will be off-net for two or three days.

BTW, Tom Brown keeps asking who my sources at Eimac were. I can not give
that information out (as I have said) because they really don't want to be
involved in this.
They did say they will consider making one more final statement as soon as
they have time, if Mr. Measures agrees to accept their position as the
final word on this subject.

Anyone doubting Eimac's position can investigate things on their own. I
wouldn't wish the kind of technical nonsense being argued here on anyone.

My opinion is anyone believing fantasies about 25 watt grids handling 500
watts, VHF energy making tuning capacitors arc, VHF parasitics causing
glass to melt, Photons making tubes on standby arc over, not understanding
grid dissipation, and so on.....    is far beyond any help I can offer.

This thread has outlived any usefulness.

73 Tom


From [e-mail] Mon Nov 25 19:05:47 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More amplifier stuff
Date: 19 Nov 1996 03:50:43 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 3
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Message-ID: <[e-mail]>
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I will be off net two or three days.

73 Tom


From [e-mail] Mon Nov 25 19:05:49 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3-500Z's - whats the difference?
Date: 19 Nov 1996 03:50:44 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
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I will be off net two or three days.

73 Tom


From [e-mail] Mon Nov 25 19:05:49 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Syncronous Noise Blanker Idea
Date: 19 Nov 1996 04:31:59 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.10)
Lines: 23
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Interesting idea.  Ideally, the blanking should
be applied well ahead of the IF filter stages,
preferably using a pin-diode attenuator right
at the RFA stage.  You might consider using
multivibrator synced to the AC line, and having
some way to delay or advance the timing -- this
would allow you start the blanking at a precise
point on the AC crest just before the "breakdown"
that is causing the noise starts. Having a variable
blanking width might also be useful.  Chances are once
the breakdown occurs, the arc will substain over a considerable
portion of the downside of the AC cycle due to the
conductive nature of the ionization of the air.
That may be the bugaboo -- the arc
duration may last for a considerable portion of the AC cycle.

 Let us know how the project works!

BTW,  Collins used a TRF receiver in the 40 mhz
range in their blanker design.  Had the unit, but
never tried it.

Peter,  K1ZJH


From [e-mail] Mon Nov 25 19:05:50 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Bart Rowlett)
Subject: Re: Syncronous Noise Blanker Idea
Organization: wb6hqk
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Tue, 19 Nov 1996 06:22:42 GMT
Lines: 37

In article <[e-mail]>,
Rob Frohne <[e-mail]> wrote:
>Hi,
>
>The other day I had an idea.  The idea was for a syncronous noise
>blanker.  At home I am plagued by QRN coming from a substation about a
>mile north of my QTH.  I've tried SEM's QRM Eliminator (which uses another
>antenna to pick up the nearby noise, adds it in with the signal from the
>main antenna, and amplitude and phase controls to sum the noise to zero),
>but it didn't solve my problem.  I never could get another antenna to pick
>up the QRN from a mile away anywhere near as well as my four element
>quad.
>
>So anyway, my idea is this:  Assuming the noise is coming from arcing of a
>60 Hz source, actually the same 60 Hz source I'm powering my radio on, and
>assuming it happens on peaks, then it will happen 120 times a second.  Why
>not build a blanker that triggers on the 60 Hz line signal and that has an
>adjustable blanking interval time and adjustable delay from the trigger?
>Has anyone tried this?  What kind of results were had?

I tried it years ago with favorable results when I had a local single
phase arcing problem.  Depending on where the arcing is actually
occuring in the substation, the arcing may be at a 360 Hz rate
corresponding to the voltage peaks of each of the three phases.  Due to
voltage breakdown differences in the individual phases you can expect the
noise pulses not to be uniformily spaced in time. This means you might
need three (or six) individual phasing controls making for tricky adjustment.

I suspect a properly adjusted noise blanker followed by one of the modern
DSP noise cancellation filters might be a better way to go these
days but I don't have any experience with the DSP units as of yet.

bart  wb6hqk

[e-mail]




From [e-mail] Mon Nov 25 19:05:51 1996
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From: [e-mail] (Andy Jeutter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home made paddles?
Date: Tue, 19 Nov 1996 08:40:33 GMT
Organization: Eastman Kodak Company
Lines: 23
Message-ID: <56rrqf$[e-mail]>
References: <[e-mail]>
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Monty Wilson <[e-mail]> wrote:

>I would like to put together small and inexpensive iambic
>paddles for the car.

<snip>

>I'd like to find some material I could use for switches
>that wouldn't take too much force to actuate and could last
>many thousands of closures and openings.

>Has anyone invented this wheel already?

Monty,

I use two contacts out of an old rotary dial
telephone. They were used for the flash key.
The base maretial is a T-shaped aluminum piece.
The contacts are fixed between two small PCB
pieces.

73, Andy DL4SEI



From [e-mail] Mon Nov 25 19:05:52 1996
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From: [e-mail] (Ralf Haueisen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Semi-Rigid ?
Date: 19 Nov 1996 14:16:09 GMT
Organization: University of Karlsruhe, Germany
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Hello.

Were can I get Semi-Rigid cables made of stainless steel (not copper!).

73, Ralf, DF1IAZ


--
Ralf Haueisen  ***  eMail [e-mail]


From [e-mail] Mon Nov 25 19:05:55 1996
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From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Semi-Rigid ?
Date: 19 Nov 1996 15:05:54 GMT
Organization: Netcom
Lines: 21
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References: <56sff9$[e-mail]>
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In <56sff9$[e-mail]>
[e-mail] (Ralf Haueisen) writes:
>
>Hello.
>
>Were can I get Semi-Rigid cables made of stainless steel (not
copper!).
>
>73, Ralf, DF1IAZ
>
>
>--
>Ralf Haueisen  ***  eMail [e-mail]
Ralf,

I'm not sure what you mean exactly by semi rigid cable, if you want a
very stiff Stainless Steel cable made of multiple wires, go to a marine
shop specializing in Sail Boats, many of the cables are fairly rigid
and all are Stainless Steel.

Glenn Sparks  KI5GY


From [e-mail] Mon Nov 25 19:05:56 1996
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From: "Thomas J. Alessi" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: Plans for a tube/xtal transmitter.
Date: Tue, 19 Nov 1996 10:59:46 -0500
Organization: T.J. Alessi & Associates, Inc., Stamford, Conn. USA
Lines: 17
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Hi guys (and girls)
        I am looking for a winter project to keep me busy.  I am looking for
plans for a crystal control, tube transmitter (& PS) maybe 10 or 20
watts.  I used to have old handbooks and such, but I can't find
anything.

If you have a descent project please contact me by E-Mail and I will
make arrangement to get them from you.

Thanks in advance.

Tom - K1TJ
--
-----------------------------------------------------------------------
 Thomas J. Alessi, 147 Joffre Avenue, Stamford, Connecticut 06905-2933
 203.977.5200     *     [e-mail]     *     http://alessi.com/tom
-----------------------------------------------------------------------


From [e-mail] Mon Nov 25 19:05:56 1996
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From: "Lee C. Carpenter" <[e-mail]>
Newsgroups: alt.beer,alt.beer.like-molson-eh,fido.mo.beer,fido7.mo.beer,fido7.ru.beer,fsu.freenet.beer,mail.homebrew,rec.beer,rec.food.drink.beer,rec.radio.amateur.homebrew,sci.homebrew,sita.beer,uiuc.org.homebrewers
Subject: Executioner Graphic
Date: 19 Nov 1996 16:04:02 GMT
Organization: a Digital Internet AlphaServer Site
Lines: 3
Message-ID: <01bbd632$117045a0$[e-mail]>
NNTP-Posting-Host: l110.redrose.net
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I need an executioner graphic for my soon to be bottled "Jack Ketch Black
Hood Stout". No luck on the net so far. Help!



From [e-mail] Mon Nov 25 19:05:57 1996
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From: jarjwr <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.swap,rec.radio.swap
Subject: Re: FS Tubes
Date: Tue, 19 Nov 1996 11:31:57 -0700
Organization: NETConnect, Utah
Lines: 16
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References: <[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:21204 rec.radio.swap:95774

Joe Giraudo wrote:
>
> I have the following tubes available
>
> Number              QTY
> 6SH7                 46
> 5Y3GT                34
> 6SH7GT              116
> 6AT6                 26
> 12AT7                13
>
> All or part for sale.  Proceeds to local Amateur Radio Club.
>
> Any interest?  Make offer
Joe Our club has about 1000 tubes of the TV type for sale. If you find
an interested party, please pass this along. Thanks Jim


From [e-mail] Mon Nov 25 19:05:58 1996
From: [e-mail]
Subject: Rotator Controllers
Newsgroups: rec.radio.amateur.homebrew
X-User-Info: 196.28.25.74 196.28.25.74
NNTP-Posting-Host: 206.103.128.4
Message-ID: <32920145.0@206.103.128.3>
Date: 19 Nov 96 18:49:41 GMT
Lines: 5
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Does anyone have any designs for controllers that will work with
programs that support the KCT and SAS1(I think....)controllers?
Even the handshaking that goes on would be a place to start.
Regards
Craig Gibson


From [e-mail] Mon Nov 25 19:05:59 1996
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From: [e-mail] (patol)
Newsgroups: rec.radio.amateur.homebrew
Subject: b&w inductors
Date: 19 Nov 1996 19:36:14 GMT
Organization: Indigo Navigator User
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does any one know if its possible to buy the B&W inductors used in lots
of ARRL projects outside the USA, eg in england ?

pat ei8cz



From [e-mail] Mon Nov 25 19:06:00 1996
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From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Semi-Rigid ?
Date: Tue, 19 Nov 1996 22:13:47 LOCAL
Organization: Starnet
Lines: 21
Message-ID: <[e-mail]>
References: <56sff9$[e-mail]>
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In article <56sff9$[e-mail]> [e-mail]-karlsruhe
.de (Ralf Haueisen) writes:
>From: [e-mail] (Ralf Haueisen)
>Subject: Semi-Rigid ?
>Date: 19 Nov 1996 14:16:09 GMT

>Hello.

>Were can I get Semi-Rigid cables made of stainless steel (not copper!).

>73, Ralf, DF1IAZ


>--
>Ralf Haueisen  ***  eMail [e-mail]

Ralf,

Are you speaking of coax with an outer SS conductor?

Wes ,N7WS



From [e-mail] Mon Nov 25 19:06:01 1996
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From: [e-mail] (Rob Barris)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: * Digital T-Hunting page
Date: Tue, 19 Nov 1996 14:46:30 -0800
Organization: Quicksilver Software, Inc.
Lines: 21
Message-ID: <[e-mail]>
NNTP-Posting-Host: 205.162.90.249
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Xref: news1.epix.net rec.radio.amateur.homebrew:21237 rec.radio.amateur.misc:118504

   I have put up a new T-Hunt Web Page.  Rather than write yet another
introduction to T-Hunting, I start it off with some links to some known
good T-Hunt pages, and then follow up with some stuff about the T-Helper
and T-Helper Pro RDF projects.  Hopefully by this time next year I will
have a few new projects to write about as well.

   http://www.quicksilver.com/~rbarris/

   There is a link to the T-hunt section right there on the home page.

   Hope you all like it.  I previewed it on both Mac and Windows versions
of Netscape 2.02/3.0 and everything looks OK here, but do let me know if
you spot anything strange.  I did get a couple reports of one animated GIF
looking funny on Internet Explorer but OK on Netscape.

73 de KD6IFZ

Rob Barris
Quicksilver Software Inc.
[e-mail]
* Opinions expressed not necessarily those of my employer *


From [e-mail] Mon Nov 25 19:06:02 1996
From: Peter Treybal <[e-mail]>
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
MIME-Version: 1.0
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Syncronous Noise Blanker Idea
References: <[e-mail]> <[e-mail]>
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I once thought of doing exactly this sort of thing to get rid of noise
from those miserable phase-controoled light dimmers which are all over
the area here. I'll bet it would work well for synchronous non-arcing
noise sources. As a suggestion for the arcing situation, you could try
looking at your line voltage with a scope synced to the line and see if
you can spot glitches that are reasonably short that you could blank. I
did that, and observed that the phase-controlled noise has a lot of time
jitter, so I'd need to make some sort of "tracking" blanker. Duration of
the damped sinusoids was about 5 microsec. Also, there were usually three
or four sources! Sounds like good work for a DSP.



From [e-mail] Mon Nov 25 19:06:03 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!uunet!in2.uu.net!news.iij.ad.jp!nr1.scn.co.jp!sinfony-news!sonygw2!oskgw!news
From: Peter Shintani <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: CQ June'96 QRN Squasher, does it really work ?
Date: 20 Nov 1996 01:00:43 GMT
Organization: Sony Japan
Lines: 24
Message-ID: <56tl7r$[e-mail]>
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Hi:
        I had trouble finding the specified FET, so I used a similar 2SK125 fe
t.
The circuit worked but the frequency response was uneven and peaky.
It turned out that the RF choke I was using was  self resonant at 1 MHz or
so. I searched and searched but I could not find a suitable RF choke that had
the specified 2.7 mH of inductance with a suitably high self resonance.
( I have feeling that a smallL would be ok.)
I gave up on the design. I had afew NEC upc1651 rf amp ic's. I replaced
the two gain stages with the upc's and used a simple hybrid combiner to
add the two signals.I have still to check the operation. But the
frequency response is now flat for the main antenna path up to
atleast 100 MHz, that is the measurement limit of my gain phase
analyzer. The Noise antenna path is -8 dB at 100 MHz.
         I was wondering if anyone else had any luck with thie CQ QRN Squasher
as published and or knew of any mod's to fix or improve the performance.
I noticed that commercially available units have some sort of preselector
feature, it's lacking in the CQ ciruit, perhaps it is necessary ?
        RSVP via email is appreciated
[e-mail]
PEter






From [e-mail] Mon Nov 25 19:06:03 1996
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From: [e-mail] (Riccardo Gaggioli)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tube JAN 7782
Date: Wed, 20 Nov 1996 01:36:49 +0000
Organization: Centro Servizi Interbusiness
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip6.etrurianet.it

Hello,who can help me with the characteristics of a ceramic JAN 7782 tube?
Thank you,
IK5WQO Riccardo


From [e-mail] Mon Nov 25 19:06:04 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!server-b.cs.interbusiness.it!slip6.etrurianet.it!user
From: [e-mail] (Riccardo Gaggioli)
Newsgroups: rec.radio.amateur.homebrew
Subject: RTTY on a Mac
Date: Wed, 20 Nov 1996 01:38:25 +0000
Organization: Centro Servizi Interbusiness
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip6.etrurianet.it

Hello,I own an Apple MAcintosh,and I would like to use it for RTTY,without
buyng an(expensive) TNC;who can help me in any way?


From [e-mail] Mon Nov 25 19:06:05 1996
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From: [e-mail] (Wilbert Knol)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Date: Wed, 20 Nov 1996 01:43:05 GMT
Organization: Nat. Inst. of Water and Atmospheric Research Ltd.
Lines: 21
Message-ID: <56tk6v$[e-mail]>
References: <[e-mail]> <560c7b$[e-mail]> <[e-mail]> <566aot$[e-mail]> <56f1bi$pp6$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 131.203.58.155
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Xref: news1.epix.net rec.radio.amateur.homebrew:21207 rec.radio.cb:37905 sci.electronics.design:26021 sci.electronics.misc:17501

[e-mail] (tyler) wrote:


>>>The standard varactor FM modulator does not inherently add pre-emphasis,
>>>so an external pre-emphasis network is used to allow PM and FM radios

>Being relatively new to this NG, what is pre-and de-emphasis exactly?  I know

>it's used in FM communications, but how and why?

The de-emphasis at the receiver end cancels pre-emphasis at the
transmitter. Pre-emphasis accentuates the higher frequencies in the
transmitted audio passband. The overall effect is a neutral transfer.

I understand the reason for this trickery is to attenuate high
frequency noise from the FM demodulator.

Wilbert, ZL2BSJ.







From [e-mail] Mon Nov 25 19:06:07 1996
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From: Tim Connolly <[e-mail]>
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Tue, 19 Nov 1996 21:19:04 -0500
Organization: Vienna Computer Services
Lines: 47
Message-ID: <[e-mail]>
References: <56bbbe$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: kb8eht2.mountain.net
Mime-Version: 1.0
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To: KW5Q <[e-mail]>
Xref: news1.epix.net alt.radio.digital:1607 rec.radio.amateur.digital.misc:20176 rec.radio.amateur.dx:1344 rec.radio.amateur.equipment:42632 rec.radio.amateur.homebrew:21209 rec.radio.amateur.misc:118440 rec.radio.amateur.space:8852 rec.radio.shortwave:88786 alt.ham-radio.packet:196

KW5Q wrote:
>
> I have uploaded to Simtel.Net:
>
> http://www.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
> ftp://ftp.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip   1032518 byte
s
>
> sbfft11.zip     Sound Blaster spectral display and filtering
>
> Features:
>  * Sound Blaster 16 (or 100% compatible) input and output.
>  * Band widths of 2K, 4K, 8K or 16K Hz.
>  * Spectral resolutions of 1 Hz to 16 Hz per pixel.
>  * Display of power spectral density with any of 4 color maps in either
>     linear or logarithmic scale.
>  * Define and use as many as to six filters simultaneously -- band pass,
>     band stop, low pass, and high pass.
>  * Filters are defined graphically by mouse movement based upon
>     the displayed spectrum.  Once you see a signal, you can
>     quickly define a pass or stop filter around the signal by clicking
>     and dragging the mouse.
>  * Net filter passband is displayed at all times.
>  * Filters can be selectively enabled and disabled by a single
>     keystroke.
>
> Special requirements: DOS 3.0 or higher, SB16 or 100% compatible, SVGA,
>                       VESA modes 101, 105, mouse.
>
> Copyrighted Freeware.  Uploaded by the author.
>
> Kevin - KW5Q
>
> [e-mail]
>
> $$e^{-\frac12 K^2} \frac d{dK} e^{\frac12 K^2}e^{\sqrt{in}}$$
> Kevin McWilliams
> KW5Q
> Applied Mathematician


Could you explain what this software is used for, thanks!
Sounds like something I have been interested in.

-- Tim Connolly
-- Vienna Computer Services & World Wide Web Advertising
-- http://www.midohiovalley.com/vcs
-- mailto:[e-mail]


From [e-mail] Mon Nov 25 19:06:07 1996
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From: [e-mail] (the Johnsons)
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood TS930/940S MRF422 final replacements
Date: Wed, 20 Nov 1996 03:29:32 GMT
Organization: Chester County Internet Services, Inc.
Lines: 9
Message-ID: <56tues$[e-mail]>
NNTP-Posting-Host: pm2x24.chesco.com
X-Newsreader: Forte Free Agent 1.0.82

Howdy,   Has anyone successfully used the newer high-beta MRF422's  as
replacements in a TS930/940. RF Parts price is $89/pr vs $169.95/pr
for the low-beta versions. Kenwood gets about $190/pr for
replacements. I'm in the process of trying to make this work and
would appreciate any info on caveats to avoid re-inventing the wheel.
Any comments or reflections would be appreciated.

        Thanks much  Greg  K3EWZ  [e-mail]



From [e-mail] Mon Nov 25 19:06:09 1996
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From: "K.R.Burtchaell" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: gluing to teflon
Date: 20 Nov 1996 03:51:32 GMT
Organization: KENTRON
Lines: 4
Message-ID: <56tv84$[e-mail]>
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I am looking for an adhesive to stick to teflon dielectric or a way to
treat teflon dielectric to enable metal to be glued to it.Can anybody
help?  73  Ken W6GHV



From [e-mail] Mon Nov 25 19:06:10 1996
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From: [e-mail] (Michael Covington)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Followup-To: sci.electronics.design,rec.radio.amateur.homebrew
Date: 20 Nov 1996 03:58:11 GMT
Organization: University of Georgia, Athens
Lines: 23
Message-ID: <56tvkj$[e-mail]>
References: <[e-mail]> <3283a802.4394752@139.187.128.43> <[e-mail]> <56d88l$[e-mail]>
NNTP-Posting-Host: aisun3.ai.uga.edu
X-Newsreader: TIN [UNIX 1.3 PL.1(UGAI)]
Xref: news1.epix.net sci.electronics.design:26036 rec.radio.amateur.homebrew:21210

Behzad Sadeghi ([e-mail]) wrote:
:
: i've never used plls for am demodulations, since it seems to
: be an overkill. but i don't see anything wrong with using a
: pll to demodulate an am signal. it works exactly the same way
: as an fm demodulator (at least in theory). unless i'm missing
: something.

It's quite different, actually.  The FM output (VCO input) would stay
constant with an AM signal -- nothing there.  What you do is generate
an oscillation that is phase-locked to the AM signal, but won't go away
if the AM carrier momentarily fades, and you analog-multiply it with
the incoming signal.  Result: Demodulated AM.

Why do this?  (1) Better linearity than a diode.  (2) It largely
counteracts "selective fading."  Selective fading, as I understand it,
is what happens when the signal is momentarily added to a slightly
Doppler-shifted copy of itself (reflected off a moving layer of
the ionosphere).  (Or maybe phase-shifted is enough; this isn't fresh
in my mind.)  That's what makes the shortwave radio go mushy for a
few seconds every now and then.  But if the PLL is well designed,
it won't change phase very fast; it will stay in phase with the
original carrier and the sound will be much better.


From [e-mail] Mon Nov 25 19:06:11 1996
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From: [e-mail] (Charles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Linling radios together
Date: Tue, 19 Nov 1996 22:04:23 -0600
Organization: United States Internet, Inc.
Lines: 9
Message-ID: <[e-mail]>
NNTP-Posting-Host: col-max85.dynamic.usit.net

Does anyone have a diagram to connect two vhf radios together using the
mic connections only to make a temperary repeater for emergency use?????

Any sugestions would be appreciated.


Thanks

Charles    KD4HHX


From [e-mail] Mon Nov 25 19:06:12 1996
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From: msimms <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: rf grounding
Date: 20 Nov 1996 04:31:59 GMT
Organization: Medical College of Wisconsin
Lines: 16
Message-ID: <56u1jv$[e-mail]>
NNTP-Posting-Host: post.its.mcw.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

Can anyone explain what the "ideal" grounding situation is for a ham
station. My shack is in a basement area. The tvi on cable is quite severe.
The antenna is a GAP vertical only 10 feet from the house. On 40 meters,
when the amp is on (1 kw) it triggers a relay switch for the doorbell
(also located in the basement shack area).

Is it necessary to use copper flashing and connect to an outside ground
rod? Is one ground rod sufficient? Can I connect to a cold water pipe?
Both?

Any ideas or suggestions?

Thanks,

Mark, W9MS



From [e-mail] Mon Nov 25 19:06:13 1996
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From: [e-mail] (Wilbert Knol)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: IC-736 Computer Control
Date: Wed, 20 Nov 1996 04:46:03 GMT
Organization: Nat. Inst. of Water and Atmospheric Research Ltd.
Lines: 15
Message-ID: <56tuu0$[e-mail]>
References: <01bbd368$0cfa2440$fdefaec7@76714610>
Reply-To: [e-mail]
NNTP-Posting-Host: 131.203.58.155
X-Newsreader: Forte Free Agent 1.0.82

"John Luebs" <[e-mail]> wrote:

>I have an IC-736 HF/6 rig. I'm building a simple CI-V interface out of a
>7805, MAX232, and 5-1uf caps. I know that the connection on the radio is a
>1/8 inch stereo jack. How are the wires (RX,TX,GND) connected to the plug?

>Thanks
>John Luebs

RX=TX. The CI-V interface is bi-directional. If the 736 is anything
like my 725 it will be on a 3.5 mm mono jack. Hope this helps.

Wilbert, ZL2BSJ.





From [e-mail] Mon Nov 25 19:06:14 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!news.asu.edu!aztec.asu.edu!ballnt
From: [e-mail] (John Ballentine)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: gluing to teflon
Date: 20 Nov 1996 04:55:13 GMT
Organization: Arizona State University, Tempe, AZ (USA)
Lines: 26
Message-ID: <56u2vh$[e-mail]>
References: <56tv84$[e-mail]>
Reply-To: [e-mail] (John Ballentine)
NNTP-Posting-Host: aztec.asu.edu


In a previous article, [e-mail] ("K.R.Burtchaell") says:

>I am looking for an adhesive to stick to teflon dielectric or a way to
>treat teflon dielectric to enable metal to be glued to it.Can anybody
>help?  73  Ken W6GHV
>
Circuit board manufacturers use a super powerful base called "Tetra Etch"
to pepare PTFE boards for plated through holes and bonding of two boards.
It is Sodium Naphthenate. Before Tetra Etch was introduced a solution of
metallic Sodium in liquid ammonia was used (not the household cleaner, which
is ammonia gas dissolved in water, ammonia gas cooled to the temperature
where it liquifies. Not something you could do at home.)

PTFE is not easy to bond anything to. Most strip line circuits use a meltable
fluropolymer film to bond the layers. If you have a hydraulic press with
platens that can be heated to about 700 F, you can directly bond two layers
without the bond film.

Epoxy adhesives will give a reasonable bond, but it will depend on the
preparation of the surfaces to be bonded. Tetra Etch treatment before the
epoxy is highly recommended.

--
John Ballentine WB2SNB          Divina natura dedit agros,
Chandler, Arizona               ars humana aedificavit urbes.


From [e-mail] Mon Nov 25 19:06:15 1996
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From: [e-mail] (M Simon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: rf grounding
Date: Wed, 20 Nov 1996 06:25:47 GMT
Organization: Space-Time Productions
Lines: 12
Message-ID: <56u89e$[e-mail]>
References: <56u1jv$[e-mail]>
NNTP-Posting-Host: 206.230.95.11
X-Newsreader: Forte Free Agent 1.0.82


>Any ideas or suggestions?

QRP


In the end people get the government they deserve.

Read "The Weapon Shops of Isher" by A.E. vanVogt

Simon



From [e-mail] Mon Nov 25 19:06:18 1996
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From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: power combiner / mrf151g
Date: 20 Nov 96 07:06:40 GMT
Organization: Siemens AG, Public Communication Networks, Munich Germany
Lines: 36
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


hello,

i read your request in the homebrew according power combiners. despite the =
=
coupler using sage wireline, which is surely very good, i successfully use a=
 =
180 deg coupler made of simple 75ohms coax. You need three quarter wave =
pieces and one three times quarter wave. I use it to combine two 2N6084 on =
2m. There are also good experiences when combining high power even with tube=
 =
amps and even different power levels. I have an english language description=
 =
and would fax it to you if you tell me your fax number.

But, second, I kindly request you to tell me more about your experiences =
with the MRF151G. I thought very much about building one for myselfs as a =
driver for my tube, but hesitated since there was no one with experiences. =
Can you please tell me yours:
 - Must the 50V supply be stablized or can it be a simple =
transformer-reticifier-capacitor supply?
 - How accurate must the semi-rigid-transformers beeing made?
 - Did you cover the semi-rigid-transformers with ferrite or not?
 - What is the output when driving the amp with 5W, 10W?
 - What is the maximum output at which drive? What is the input current the=
n?
 - How did you solve the cooling problem. Motorola recommends a copper plat=
e =
between the transistor and the heat sink. Did you do that this way?

Thanks a lot for your help and cul=21

vy 73, Guenter, DL4MEA=40DB0KCP.=23BAY.DEU.EU   (AX.25)
                dl4mea=40amsat.org            (Internet)
                http://www.scn.de/=7Ekoellner (WWW)



From [e-mail] Mon Nov 25 19:06:19 1996
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From: Dave Booth <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Updated Homepage
Date: Wed, 20 Nov 1996 00:50:33 -0800
Organization: KC6WFS
Lines: 4
Message-ID: <[e-mail]>
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Just updated my Page.. Check out my 1967 ss/rs camaro!!!!!!!
-
http://www.geocities.com/Hollywood/5860/
Dave Booth kc6wfs dm04


From [e-mail] Mon Nov 25 19:06:20 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!homer.alpha.net!news
From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Toh.Tsu RF Relays...who has?
Date: Wed, 20 Nov 1996 01:51:20 -0800
Organization: Aero Head Aviation
Lines: 8
Message-ID: <[e-mail]>
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I saw someone advertising a web page selling Toh Tsu RF relays...who was
it?  Looking for a few for two amplifier projects.  Source for reasonably
price Dow Key relays ok also.  73, Scott.  N0EDV.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Mon Nov 25 19:06:21 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!ddwyer.demon.co.uk!ddwyer
From: Douglas Dwyer <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 16.384MHz freq standard
Date: Wed, 20 Nov 1996 10:55:36 +0000
Organization: FP
Lines: 8
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: ddwyer.demon.co.uk
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MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.12 <iq8rvUYxwmrVWYgB1Esp4Q5R$P>

16.384MHz latest technology SC cut crystal oscillators 0.001ppm
stability, pre calibrated to 0.1ppm . 76X31X50mm hermetic pcb mounting,
use directly to set up counter standard or devide to 1kHz for freq
synth.  $90 to almost anywhere email for more detailed spec.
Douglas Dwyer Frequency Precision Ltd. Reply via demon or
[e-mail] phone/fax [phone]
http://ourworld.compuserve.com/homepages/Frequency_Precision/



From [e-mail] Mon Nov 25 19:06:24 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!munnari.OZ.AU!news.unimelb.EDU.AU!sleipnir.iaccess.com.au!news
From: "Paul Giusti [VK3FPG]" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: am broadcast loop antennas
Date: Wed, 20 Nov 1996 22:14:21 +1100
Organization: Internet Access Australia
Lines: 26
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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I have been looking with no success for some plans or constructional
information for a broadcast band (500-1700khz) loop antenna and am
hoping someone out there may be in a position to e- mail me some plans
or direct me to a web resource that has this information available.

  I am just beginning this aspect of the hobby and would be appreciative
of any help anyone can offer.

              Thanks in advance

                     Paul Giusti  [VK3FPG]



--
 Paul Giusti       Rxvrs        Decoders
 VK3FPG           NRD-525       Hoka Code3
                  IC-706        Hoka Code3 Gold
 P.O.BOX 548      IC-737a       Universal M-6000v9
 Elsternwick      WINRADIO      UNIVERSAL M-1200
 Australia        PRO-2006      KAM+
 3185
                       member of WUN

 Facsimile [phone]
 e-mail [e-mail]


From [e-mail] Mon Nov 25 19:06:25 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!math.ohio-state.edu!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!ott.istar!istar.net!news.nstn.ca!coranto.ucs.mun.ca!upei.ca!usenet
From: [e-mail] (David Seeler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Audio Compander, Mic preamp and improved Audio
Date: Wed, 20 Nov 1996 11:49:20 GMT
Organization: University of Prince Edward Island, Charlottetown, PEI Canada
Lines: 17
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Hi _ I am in the process of building a mike preamp/equalizer that
was described in the Feb 1986 issue of CQ Magazine.  The circuit
uses a Signetics NE580 (or 570?) audio compander to maintain
constant audio input through the circuit.

Does anyone know of a source ( Canadian or US) that has This
(these) chip(s)  and is willing to ship in small numbers? I have
so far been unable to find a Canadian distributer.  Philips has
taken over Signetics, but I can get no information about their
availability  from the Canadian office.

Thanks for any pointers you might be able to give me!



Regards,
David Seeler, VY2DCS


From [e-mail] Mon Nov 25 19:06:25 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!swrinde!ihnp4.ucsd.edu!ames!purdue!mozo.cc.purdue.edu!news
From: Mark McGregor <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Mods for FT-8000R
Date: Wed, 20 Nov 1996 08:19:13 -0500
Organization: Purdue University
Lines: 6
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Does anyone have the mods for the new Yaesu FT-8000R?  I've looked at
the OAK and QRZ ftp sites and found nothing.

Thanks in advance!

    Mark  <KB9KHM>


From [e-mail] Mon Nov 25 19:06:26 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news
From: [e-mail] (Brad Bradfield)
Newsgroups: rec.radio.amateur.homebrew
Subject: PANEL METERS FOR SALE - METER.MSG [1/1]
Date: 20 Nov 1996 14:32:17 GMT
Organization: TI Javelin
Lines: 32
Message-ID: <56v4ph$[e-mail]>
NNTP-Posting-Host: cna0157453.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.7

PANEL METERS FOR SALE

I have for sale several 4-1/4"W X 4"H black-faced panel meters.  These are
perfect for a homebrewed linear amplifier or other suitable boatanchor.
Available are:

   0-5000 VDC (requires 5 MegOhm external multiplier resistor, not supplied)
   0-1 ADC
   0-1.5 ADC
   0-25 mADC
   0-50 mADC
   0-150 mADC
   0-500 mADC (2 each - one w/glass broken - easily replaceable)
   0-350 VAC
   Totalizer elapsed time meter (240 VAC, 60 Hz, shows 49,275.1 Hours)

These meters were manufactured by Westinghouse and were removed from the first
FM broadcast transmitter (KOZY) in the state of South Dakota which went into
service in the late 1940's or very early 50's and was only in service for two
or three years.

Price, $10.00 each ($5.00 for the one with broken glass) plus shipping.
$85.00 plus shipping for the lot.

Brad, WB0CGH

Brad Bradfield
(H) 817-321-2960
(W) 972-462-6230

[e-mail]  (E-mail)
 


From [e-mail] Mon Nov 25 19:06:27 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!homer.alpha.net!uwm.edu!cs.utexas.edu!news.sprintlink.net!news-peer.sprintlink.net!uunet!in2.uu.net!lou.teclink.net!usenet
From: "Tom C. Brown, Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 20 Nov 1996 09:40:24 -0600
Organization: TECLink Internet Services: [e-mail]
Lines: 11
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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To: [e-mail]

Partial quote from Tom's message:

>They did say they will consider making one more final statement as soon as
>they have time, if Mr. Measures agrees to accept their position as the
>final word on this subject.


"They" again......


Tom KJ5IE


From [e-mail] Mon Nov 25 19:06:29 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!portc02.blue.aol.com!portc01.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: rf grounding
Date: 20 Nov 1996 15:52:50 GMT
Organization: AOL http://www.aol.com
Lines: 34
Message-ID: <[e-mail]>
References: <56u1jv$[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

Queston:  Can anyone explain what the "ideal" grounding situation is for a
ham
station. My shack is in a basement area. The tvi on cable is quite severe.

The antenna is a GAP vertical only 10 feet from the house. On 40 meters,
when the amp is on (1 kw) it triggers a relay switch for the doorbell
(also located in the basement shack area).

Reply:   That's a pretty tall order!  Your house wiring is so far into the
antenna's near field that it is probably affecting antennna resonance--and
functioning as part of the radiating system!

1.  If there is ANY way you can move the antenna 1/4 -wave or so from the
surrounding structures, (a.) it should work better and (b.) the RF level
in your house will drop enormously (it's a cube-root relationship in the
near field).

2.  Put lots of ferrite sleeves on the coax before it enters the house.
If the feed isn't totally decoupled from the antenna (which I doubt it
is), it will (depending upon how  much decoupling there actually is)
radiate.

3.  Run less power.  If you can't move the antenna away, I don't really
see how you can eliminate extremely strong RF fields from the interior of
the house (unless you shield the whole building).  Your only option, then,
is to lower the field strength in the area by decreasing power.

A better ground system probably wont solve your problem--and it might even
make it worse.  Your house and its contents happen to be occupying the
same space where the electric field generated by the antenna needs to be
very strong in order to work.  If you make the RF go away, your signal
will probably go away with it.

Rick  K1BQT


From [e-mail] Mon Nov 25 19:06:30 1996
Message-ID: <[e-mail]>
Date: Wed, 20 Nov 1996 18:29:22 +0100
From: William Vynck <[e-mail]>
X-Mailer: Mozilla 3.0Gold (Win95; I)
MIME-Version: 1.0
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.dx
To: MICHAEL J DRUM <[e-mail]>
Subject: Re: Want Kenwood IF-10D Computer Interface.
References: <56l7cr$[e-mail]> <56na4m$[e-mail]>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
NNTP-Posting-Host: dialinhosto052.unicall.be
Lines: 20
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in1.uu.net!nntp.inet.fi!news.bru.tfi.be!dialinhosto052.unicall.be
Xref: news1.epix.net rec.radio.swap:95903 rec.radio.amateur.antenna:31800 rec.radio.amateur.digital.misc:20186 rec.radio.amateur.equipment:42683 rec.radio.amateur.homebrew:21234 rec.radio.amateur.misc:118491 rec.radio.amateur.policy:43314 rec.radio.amateur.space:8856 rec.radio.amateur.dx:1349

MICHAEL J DRUM wrote:
>
> Greetings,
>
> I want to buy a Kenwood IF-10D Computer interface for my TS-60. If you
> have one for sale please contact me at my Email address and let me know
> the details. I will answer all reply's sent.
>
> Thank You.
>
> Mike>


DONT BUY !!

To expencive, i could send you the chematics to build one.


73
William


From [e-mail] Mon Nov 25 19:06:31 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Need background about Mocom
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <56qn9r$[e-mail]>
Date: Wed, 20 Nov 1996 18:05:56 GMT
Lines: 20

In article <56qn9r$[e-mail]> [e-mail] (Derek Toeppen) wr
ites:
>       A friend has come across a hand full of UHF Mocom 70 radios. He asked
>if they can be used as repeaters.
>       I have worked with Mitreks and Micors but know nothing about Mocoms.
>Was wondering if anyone here could fill me in? My first thought is that the
>Mocom was the model before the Micor. Is this correct? Do the make a
>reasonable repeater? How about a link radio?

Yeah, the Mocom is older than the Micor. You can use them for repeater
duty, but they're pretty old, and their performance is markedly worse
than the Micor (which is getting pretty old itself). I wouldn't waste
my time on them (unless I had plenty of time to waste and no money to
get a more desirable radio).

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Nov 25 19:06:32 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news.ismi.net!usenet
From: TIM MENARD <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: wiring print
Date: Wed, 20 Nov 1996 10:35:49 -0800
Organization: LUCKY  7 SOFTWARE
Lines: 6
Message-ID: <[e-mail]>
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Hi

I'm looking for a wiring print for a Pro-25 scanner,can any one help?
Thanks

TMAN


From [e-mail] Mon Nov 25 19:06:33 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!gatech!csulb.edu!news.sgi.com!enews.sgi.com!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!news-e2a.gnn.com!portc01.blue.aol.com!newstf01.news.aol.com!newsjunkie.ans.net!newsfeeds.ans.net!butch!cstevens
From: [e-mail] (/E00680/cstevens/Carl Stevens)
Newsgroups: rec.photo.technique.nature,rec.photo.technique.people,rec.ponds,rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Save 80% On Your Grocery Bills!!!
Followup-To: rec.photo.technique.nature,rec.photo.technique.people,rec.ponds,rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Date: 20 Nov 1996 19:27:52 GMT
Organization: Lockheed Martin M & S, Sunnyvale, CA
Lines: 20
Message-ID: <56vm3o$[e-mail]>
References: <56tvo3$[e-mail]>
NNTP-Posting-Host: liquid.ladc.lockheed.com
X-Newsreader: TIN [version 1.2 PL1]
Xref: news1.epix.net rec.photo.technique.nature:6130 rec.photo.technique.people:4440 rec.ponds:18529 rec.puzzles:73783 rec.puzzles.crosswords:7385 rec.pyrotechnics:56571 rec.radio.amateur.antenna:31804 rec.radio.amateur.digital.misc:20190 rec.radio.amateur.equipment:42691 rec.radio.amateur.homebrew:21236

[e-mail] wrote:
: THIS is Your Problem!!!

Sorry for the massive crosspost. This is just to let everyone know that
I sent a complaint about this spam to [e-mail]. I am not
advocating that everyone do this and bring the system to it's knees -
that would be a personal choice.

I think I'll send a complaint to [e-mail] also; just to
make sure the bases are covered.


Carl Stevens                      _\_/^\_/_          Long EZ N223MM
[e-mail]  _____/_/_/|\_\_\_____    And one on the way!

"The right of self-defense is the first law of nature ... and when
 the right of the people to keep and bear arms is, under any color
 or pretext whatsoever, prohibited, liberty, if not already
 annihilated, is on the brink of destruction."
 -- St. George Tucker, in his edition of Blackstone's Commentaries


From [e-mail] Mon Nov 25 19:06:34 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: gluing to teflon
Date: 20 Nov 1996 11:31:43 -0800
Organization: BEST Internet Communications
Lines: 16
Message-ID: <56vmav$[e-mail]>
References: <56tv84$[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <56tv84$[e-mail]>,
K.R.Burtchaell <[e-mail]> wrote:
>I am looking for an adhesive to stick to teflon dielectric or a way to
>treat teflon dielectric to enable metal to be glued to it.Can anybody
>help?  73  Ken W6GHV
>

I found that the penny feed for my 10GHz dish worked much better
when it was loaded with a small piece of teflon over the slot
radiator.  I glued the teflon block to the brass waveguide by
lightly sanding the teflon to roughen it up and give epoxy something
to adhere to.  This seems to have worked since the feed is 5 years
old and has gotten banged around alot.  The teflon has never fallen
off.  The feed is also waterproof as a result.

Steve Muther WF6R


From [e-mail] Mon Nov 25 19:06:35 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!arclight.uoregon.edu!usenet.eel.ufl.edu!news.bright.net!protect
From: [e-mail] (Charles)
Newsgroups: rec.radio.amateur.homebrew
Subject: 624 Kits "Oner" HELP!
Date: Wed, 20 Nov 1996 15:39:03 -0500
Organization: BrightNet Ohio
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: circ2-cs-11.dial.bright.net
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X-Newsreader: Yet Another NewsWatcher 2.3.1

I have a 624 Kits Oner QRP transmitter kit and needed some help but they
seem to be out of business. The phone is disconnected and Information says
they don't exsist at the address in the July QST. My problem is the parts
overlay diagram in the instructions does not seem to match the little
circuit board no matter how I turn it. Can someone who has built one help?
Or maybe you know where the company is now?  Please reply Email as I don't
get on the newsgroups very often. Thanks
Charles, KB8WSG in Ohio


From [e-mail] Mon Nov 25 19:06:37 1996
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From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 20 Nov 1996 21:44:56 LOCAL
Organization: Starnet
Lines: 47
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
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In article <[e-mail]> measures@mail.
vcnet.com (R. L. Measures ) writes:
>From: [e-mail] (R. L. Measures )
>Subject: Re: Good source for amplifier tips
>Date: Wed, 20 Nov 1996 10:03:27 -0700

>In article <[e-mail]>, [e-mail]
>wrote:

>> In article <[e-mail]>,
>> [e-mail] writes:
>>

>> >Let's look at a typical suppressor such as the SB-220, AL-80, or SB-1000
>> >suppressor, since a 3-500Z almost always needs a suppressor in the 100-
>> >130 MHz area. Will that be ok?
>> >
>> >73 Tom

>OK, Tom, let's have a look:  A typical anode VHF parasitic suppressor for a
>3-500Z, operating at 3kV, uses a 70nH inductor.  The suppressor resistor is
>typically 50 ohms.  At 100MHz, the reactance of 70nH is 45 ohms.  To find
>out how the current divides between the paralleled inductor and resistor,
>we can apply 1VRMS and calculate what happens.  The current through the
>resistor is 1v/50 ohms = 20mA.  The current through the inductor is 1v/45
>ohms = 22mA.  The total current is 20mA plus 22mA = 42mA.  Thus, the
>resistor carries 20/42 = 0.476, or 47.6% of the total current.  The
>inductor carries 22/42 = 52.4% of the total current.  [snip]


Don't you think it wise to consider the phase angle of these currents.  This
ain't DC you know.  Furthermore, these aren't isolated components tested in a
measurement system, they're embedded in a system that includes other
reactances and frequency dependent source and load impedances.  So, their
functional behavior is quite a bit more complicated that this "Ohm's law"
analysis.

>> This thread has outlived any usefulness.
>>
>> 73 Tom

So it would seem.


>--Rich-- ag6k, 805.386.3734

Wes, N7WS



From [e-mail] Mon Nov 25 19:06:38 1996
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From: John Mcleod <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Using 30Mhz SWR meter at 50Mhz
Date: Wed, 20 Nov 1996 14:13:28 -0800
Organization: Best Internet Communications
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Does anyone know :

  Is it possible to use my 30Mhz SWR meter to measure the swr in the
6 meter band ? What is it that determines the bandwidth of the meter ?
Would I have to change the sensor head, or do I just have to bite the
bullet and spend out money for a new one ?

John Mcleod N6RCD


From [e-mail] Mon Nov 25 19:06:39 1996
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From: Sonja og Petter Brevik <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Specs 4-1000
Date: Wed, 20 Nov 1996 22:49:30 +0000
Organization: SN Internett
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: nittedal-3.ppp.sn.no
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I am planning to build a new PA, using the 4-1000 tube. Does anybody
have more complete specs than the summary found in the handbooks?

73,
Petter
--
---->   LA7YG
        Petter Brevik
        ╪stliveien 15           Tel [phone]
        1482 Nittedal           Fax [phone]


From [e-mail] Mon Nov 25 19:06:40 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!enews.sgi.com!super.zippo.com!zdc!szdc!szdc-e!news
From: [e-mail] (Robert Fowle)
Newsgroups: rec.radio.amateur.homebrew
Subject: 'AUCTION' LINK ADDED TO MY PAGE
Date: Wed, 20 Nov 1996 23:14:25 GMT
Organization: The HAMMARLUND Historian
Lines: 31
Message-ID: <[e-mail]>
X-Newsreader: Forte Free Agent 1.1/16.230

evening everbody;
        just a note. I have added an 'Auction' link to my main page.
there, you will find items up for bid. they will have min. bid, there
is a closing date, and i will post to it-the results. also there is a
spot where i will post the current bid....(i will update this between
11pm and midnite est each day)
it is up and the current list will end on the 30th of November...
please feel free to check it out....
thank you, for your time....
p.s. i did this 1. there seems to be a trend to this way elsewhere.
and 2. to try and move some of the items i have had and can't seem to
find the 'right' price to put on them....
The URL address is in my sig.  then scroll down to "Auction items"
bye for now.....

**** Please, Visit my Web Page.....****
=================================================]-[->
Robert Fowle      KC8DBC
The HAMMARLUND Historian
Ph. 517-789-6721
1215 Winifred
Jackson, Mich. 49202-1946
E-mail:  [e-mail]
Web Page:  http://www.jacksonmi.com/hammarlund
                 HAMMARLUND LITERATURE WANTED
WANTED: MANUALS FOR ANY MAKE RADIO EQUIPMENT
=================================================]-[->
see it first on my list...to be put on the 'mail list'  (send me email)
or see it later in.....
Boatanchors  news group:   rec.radio.amateur.boatanchors



From [e-mail] Mon Nov 25 19:06:41 1996
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From: mays@indigo (Skip May)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: 21 Nov 1996 00:48:08 GMT
Organization: University of California, Davis
Lines: 29
Message-ID: <5708s8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: indigo.ucdavis.edu
X-Newsreader: TIN [version 1.2 PL2]

Most of the less expensive SWR meters that are the "trough line" type
work up to 2 meters quite nice. These are the cheaper $19.95 CB Vanco and
other brands. They're usually the 2.5 in wide 6 in long 2.5 in high box's
that feed on each end straight through (the size is approx). Most of
these type also do field strenght with a small screw hole at one end
above the SO-239 (female chassis PL-259) jack for the externa whip.

The models with toroids are usually more frequency selective and the next
step up from the above described with power/watt scales are not really
accurate accross the usefull range.
But Hey! The SWR function is a keeper and the Power/watt readout can be
calibrated to the 6 meter band. A good percentage of these meters are
pretty close out of the box..
Good luck John, Look to the ARRL handbook on ways to calibrate it up on
50MHz.

73's
skip may   wv6f
[e-mail]

John Mcleod ([e-mail]) wrote:
: Does anyone know :

:   Is it possible to use my 30Mhz SWR meter to measure the swr in the
: 6 meter band ? What is it that determines the bandwidth of the meter ?
: Would I have to change the sensor head, or do I just have to bite the
: bullet and spend out money for a new one ?

: John Mcleod N6RCD


From [e-mail] Mon Nov 25 19:06:42 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!hunter.premier.net!phase2.worldnet.att.net!netnews.worldnet.att.net!newsadm
From: Arthur Garabedian <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: CHIMNEY FOR 4CX-10,000
Date: Wed, 20 Nov 1996 18:13:56 -0800
Organization: westernmobiletel
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: 207.147.160.16
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I am looking for a chimney or phenolic material to make one for a
4CX-10,000 tube transmitter. Tube needs to be about 6" dia. 2" long.
Thanks,  ARTHUR  KC6KUK  ANAHEIM,  CA. . . .


From [e-mail] Mon Nov 25 19:06:43 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!newsfeed.internetmci.com!feed1.news.erols.com!howland.erols.net!EU.net!uunet!in3.uu.net!nntp.teleport.com!nntp0.teleport.com!ip-pdx06-08
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wilkinson Combiner or 1/4 Wave Sections ? Opinions ???
Date: Thu, 21 Nov 96 02:16:31 GMT
Organization: EZNEC Antenna Software
Lines: 24
Message-ID: <570e25$[e-mail]>
References: <56j0up$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ip-pdx06-08.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <[e-mail]>,
   [e-mail] (Jim Potter) wrote:
>[e-mail] (Jim Potter) wrote:
>
>
>>I'd recomend you consider a quadrature combiner. I t requires a 90
>>degree hybrid in the input and the output, arranged so that the phases
>>all add up correctly. The coupler is most easily made from Sage
>>Wireline which you can get from Sage Laboratories [phone].
>>
>
>
>
>OOPS! That was their FAX number. Voice number is 508-653-0844. Sorry
>for the confusion.

A quadrature combiner (or any other passive circuit) does not insure 90
degree phase difference and equal magnitude of current in two loads of
arbitrary impedance. The impedances of the elements of a phased array are
equal only in a few special cases, and almost never if their currents are
in quadrature. There's more information about this topic in Chapter 8 of
the ARRL Antenna Book.

Roy Lewallen, W7EL


From [e-mail] Mon Nov 25 19:06:44 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: Thu, 21 Nov 96 02:20:32 GMT
Organization: EZNEC Antenna Software
Lines: 16
Message-ID: <570e9m$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-pdx06-08.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <[e-mail]>,
   John Mcleod <[e-mail]> wrote:
>Does anyone know :
>
>  Is it possible to use my 30Mhz SWR meter to measure the swr in the
>6 meter band ? What is it that determines the bandwidth of the meter ?
>Would I have to change the sensor head, or do I just have to bite the
>bullet and spend out money for a new one ?
>
>John Mcleod N6RCD

Probably the toughest value to measure is 1:1, and you can check this
quickly and easily with a dummy load. Chances are that if it reads well at
1:1 it won't be badly off at other values.

Roy Lewallen, W7EL


From [e-mail] Mon Nov 25 19:06:45 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: rf grounding
Date: 21 Nov 1996 03:06:12 GMT
Organization: AOL http://www.aol.com
Lines: 6
Message-ID: <[e-mail]>
References: <56u1jv$[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

    I'd be a bit reluctant to put a Kilowatt on the air without at least
some idea of what constitutes a proper grounding system. TVI could be one
of the more benign side effects  !!!

Ed K.
Ed KB2NSP @ AOL


From [e-mail] Mon Nov 25 19:06:46 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!news.netins.net!usenet
From: Todd Peterson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Free Electronics Directory
Date: Wed, 20 Nov 1996 21:13:56 -0600
Organization: netINS, Inc.
Lines: 24
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: desm-03-46.dialup.netins.net
Mime-Version: 1.0
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Content-Disposition: inline; filename="rd.txt"

Greetings!

E-LAB Digital Engineering, Inc. is pleased to make freely available our new
Electronics Internet Resource Directory!

This directory is a collection of many internet sites of use to
electronics builders, designers, and engineers.  It is divided into
40 categories, with each category containing many hot-links to companies
and/ or web pages containing information on topics from Compilers to
Code Examples to Components Distributors.

The directory is available at http://www.netins.net/showcase/elab
You WILL want to set a bookmark!

We also invite you to check out our products, such as our new line of
integrated circuits for embedded design.

Thanks,

Todd Peterson
E-LAB Digital Engineering, Inc.





From [e-mail] Mon Nov 25 19:06:47 1996
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From: "George J. Molnar" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: Wed, 20 Nov 1996 22:44:49 -0500
Organization: Molnar & Associates, Inc
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: leb1-async-5.cyberportal.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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To: John Mcleod <[e-mail]>

John Mcleod wrote:
>
> Does anyone know :
>
>   Is it possible to use my 30Mhz SWR meter to measure the swr in the
> 6 meter band ? What is it that determines the bandwidth of the meter ?
> Would I have to change the sensor head, or do I just have to bite the
> bullet and spend out money for a new one ?
>
It might work just fine, depending on the construction of the bridge.
The actual SWR values will probably be skewed somewhat, though. As a
relative indicator, you'll probably be able to get away with 6m on a
1-30 MHz designed unit, but not much higher.
As the frequency applied diverges from the design limits, the meter will
show progressively more error, up to the point where no useful
information is available. On some bridges, the sensor coil can actually
become an appreciable part of a wavelength. At that point, you're not
looking at the "same" point on the line anymore, and can't accurately
get a ratio of forward-reverse power.
Your best bet is to get a meter designed for the frequency you are
using, always making sure it is also designed for the characteristic
impedance of the line you are using, too.

73
--
George J. Molnar (KF2T)
Molnar & Associates, Inc.
Lebanon, New Hampshire
Respond to: [e-mail]
Web Site: http://www.cyberportal.net/gmolnar/index.html


From [e-mail] Mon Nov 25 19:06:49 1996
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From: [e-mail] (Zack Widup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: gluing to teflon
Date: 21 Nov 1996 05:00:22 GMT
Organization: University of Illinois at Urbana
Lines: 36
Message-ID: <570nl6$[e-mail]>
References: <56vmav$[e-mail]> <56tv84$[e-mail]>
Reply-To: [e-mail] (Zack Widup)
NNTP-Posting-Host: firefly.prairienet.org


In a previous article, [e-mail] (Stephen Muther) says:

>In article <56tv84$[e-mail]>,
>K.R.Burtchaell <[e-mail]> wrote:
>>I am looking for an adhesive to stick to teflon dielectric or a way to
>>treat teflon dielectric to enable metal to be glued to it.Can anybody
>>help?  73  Ken W6GHV
>>
>
>I found that the penny feed for my 10GHz dish worked much better
>when it was loaded with a small piece of teflon over the slot
>radiator.  I glued the teflon block to the brass waveguide by
>lightly sanding the teflon to roughen it up and give epoxy something
>to adhere to.  This seems to have worked since the feed is 5 years
>old and has gotten banged around alot.  The teflon has never fallen
>off.  The feed is also waterproof as a result.
>
>Steve Muther WF6R
>

You can "sort of" get Teflon to stick by the above method. But it isn't
very strong. I've used contact cement when I just wanted a piece of it to
hang on for a while.

I asked the local plastics man about glue for Teflon and nylon. He has
been looking for a decent product for years. He told me that every one
that has been on the market has not satisfied him.

Teflon is fairly easy to machine; depending on your needs if you have a
fairly thick piece you can drill and tap it for screws.

Zack W9SZ

--



From [e-mail] Mon Nov 25 19:06:50 1996
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From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: 21 Nov 1996 05:03:32 GMT
Organization: University of Colorado, Boulder
Lines: 22
Message-ID: <570nr4$[e-mail]>
NNTP-Posting-Host: spot.colorado.edu
NNTP-Posting-User: tiemann

In article <[e-mail]>,
John Mcleod  <[e-mail]> wrote:
>Does anyone know :
>
>  Is it possible to use my 30Mhz SWR meter to measure the swr in the
>6 meter band ? What is it that determines the bandwidth of the meter ?
>Would I have to change the sensor head, or do I just have to bite the
>bullet and spend out money for a new one ?

Before buying a new one, give the following a try:  Hook up a dummy
load to the tuner, one that will present a nice 50 + j0 ohm impedance,
and see what the meter thinks the SWR is.  Then give it a 100 + j0
load, and 25 + j0 load.  These should be 2:1.  Etc.  Probably they won't
be right on, but before you throw that one out the window, repeat
the experiment with 30 MHz!  I use an MFJ-949D tuner for 6m though
they're rated for only up to 30 MHz.  The readings are off at 6m, and
only slightly less off for 10m.  If what you want the meter for is
to see where the dip is, and not to know the precise value of the
SWR, then even is the meter is quite off, it will still work.

Bruce
N6URH


From [e-mail] Mon Nov 25 19:06:51 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!panix!news.columbia.edu!rutgers!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Date: 21 Nov 1996 06:08:05 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 30
Message-ID: <570rk5$[e-mail]>
References: <[e-mail]> <566aot$[e-mail]> <56f1bi$pp6$[e-mail]> <56tk6v$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com
Cc:
Xref: news1.epix.net rec.radio.amateur.homebrew:21242 rec.radio.cb:37955 sci.electronics.design:26126 sci.electronics.misc:17576

In article <56tk6v$[e-mail]>,
Wilbert Knol <[e-mail]> wrote:
>[e-mail] (tyler) wrote:
>
>
>>>>The standard varactor FM modulator does not inherently add pre-emphasis,
>>>>so an external pre-emphasis network is used to allow PM and FM radios
>
>>Being relatively new to this NG, what is pre-and de-emphasis exactly?  I kno
w
>>it's used in FM communications, but how and why?
>
>The de-emphasis at the receiver end cancels pre-emphasis at the
>transmitter. Pre-emphasis accentuates the higher frequencies in the
>transmitted audio passband. The overall effect is a neutral transfer.
>
>I understand the reason for this trickery is to attenuate high
>frequency noise from the FM demodulator.

Well, back in the old days, we had all these phase modulated radios,
and there's an inherent pre-emphasis in the phase modulation process.

So, to get a flat audio response (or something even close), you have
to have de-emphasis at the receiver end.  Of course, there's an inherent
advantage with respect to high frequency noise reduction...

--
 * Dana H. Myers K6JQ, DoD#: j  | Views expressed here are mine and should *
 * [phone]               | not be interpreted or represented as     *
 * [e-mail]      | those of Sun Microsystems, Inc.          *



From [e-mail] Mon Nov 25 19:06:52 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!mindspring!realtime.net!news
From: Charles Wenzel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: am broadcast loop antennas
Date: Wed, 20 Nov 1996 22:27:07 -0800
Organization: Real/Time Communications Internet customer posting
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: jake-5f.ip.realtime.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-RTcode: c0bcf59732f40028aa93d86f
X-Mailer: Mozilla 2.01 (Win16; I)

Paul Giusti [VK3FPG] wrote:
>
> I have been looking with no success for some plans or constructional
> information for a broadcast band (500-1700khz) loop antenna and am
> hoping someone out there may be in a position to e- mail me some plans
> or direct me to a web resource that has this information available...

I have a circuit for a ferrite loopstick antenna with an integral amplifier
in our technical library at www.wenzel.com. It covers the AM and most of
the shortwave band. Look in the "Antennas" article.


From [e-mail] Mon Nov 25 19:06:53 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!EU.net!Austria.EU.net!siemens.at!news
From: Kovacs Karoly <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap,rec.radio.amateur.equipment
Subject: Wanted: AD7008 DDS chip
Date: Thu, 21 Nov 1996 07:40:59 +0100
Organization: Siemens AG Austria
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: firix.siemens.at
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Xref: news1.epix.net rec.radio.amateur.homebrew:21250 rec.radio.swap:95994 rec.radio.amateur.equipment:42713

Hi OM ...

Can anyone tell me where to find the AD7008 chip from
Analog Devices? Who sells this IC? (In Europe?)

If you know something pse send me e-mail:

--
Karoly Kovacs (HA2EOF)

[e-mail]


From [e-mail] Mon Nov 25 19:06:54 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: Thu, 21 Nov 96 06:59:21 GMT
Organization: EZNEC Antenna Software
Lines: 17
Message-ID: <570uke$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-pdx14-20.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <[e-mail]>,
   John Mcleod <[e-mail]> wrote:
>Does anyone know :
>
>  Is it possible to use my 30Mhz SWR meter to measure the swr in the
>6 meter band ? What is it that determines the bandwidth of the meter ?
>Would I have to change the sensor head, or do I just have to bite the
>bullet and spend out money for a new one ?
>
>John Mcleod N6RCD

Probably the toughest value to measure is 1:1, and you can check this
quickly and easily with a dummy load. Chances are that if it reads well at
1:1 it won't be badly off at other values.

Roy Lewallen, W7EL



From [e-mail] Mon Nov 25 19:06:55 1996
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From: Ron Hanes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: need tank circuit for 160-10m
Date: Wed, 20 Nov 1996 23:20:24 -0800
Organization: AT&T WorldNet Services
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: 207.146.194.184
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A friend of mine is seeking a tank circuit for 160-10m
for a 4-1000
He said B&W used to make one.
He uses his station to aid missionarys and their families overseas.
His e-mail address is [e-mail]
thanks,
Ron Hanes


From [e-mail] Mon Nov 25 19:06:55 1996
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From: [e-mail] (morethanone kalar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RTTY on a Mac
Date: Thu, 21 Nov 1996 03:04:40 -0600
Organization: stark ravin'
Lines: 12
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ts4-12.brainerd.net
X-Newsreader: MacSOUP 2.2b5

Riccardo Gaggioli <[e-mail]> wrote:

> Hello,I own an Apple MAcintosh,and I would like to use it for RTTY,without
> buyng an(expensive) TNC;who can help me in any way?

Riccardo, if you can find a TU with an RS-232 output, you can use a
8-pin mini-DIN plug to make a cable to connect the TU to the Mac.

Mail me if you want to do this but need a pin-out for the Mac's serial
port.

-- Tony W0RHX <[e-mail]>


From [e-mail] Mon Nov 25 19:06:57 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 21 Nov 1996 05:21:57 -0700
Organization: Internet Access of Ventura County
Lines: 41
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port17.vcnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <[e-mail]>, [e-mail] wrote:

> Partial quote from Tom's message:
>
> >They did say they will consider making one more final statement as soon as
> >they have time, if Mr. Measures agrees to accept their position as the
> >final word on this subject.
>
>
> "They" again......
>
>
> Tom KJ5IE
..................................................
Who is "they"?
Mr. Rauch can't say .

Who is Mr. XXX with the phony e-mail address?
We can only guess.

On and on.

In an e-mail to me 4/5/96, Mr. Rauch said:

"If you are so sure of your theories, let's debate on Internet. We can go over
your theories point by point in a non-personal debate."

for instance:
I asked Mr. Rauch: what is the frequency of the anode-circuit's resonance
in the AL-80?
I asked Mr. Rauch: does the AL-1500 8877 amplifier (which Mr. Rauch
designed) use a vhf parasitic suppressor?

Mr. Rauch appears not to have answered these seemingly-simple questions.
How can we go over theories point by point if one party is pointedly less
than forthcoming?
---------------------------------------------
e-mail copies to Mr. Brown and Mr. Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Mon Nov 25 19:06:58 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!howland.erols.net!torn!news1.bellglobal.com!bellglobal.com!news
From: burt lang <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: gluing to teflon
Date: Thu, 21 Nov 1996 12:36:34 +0000
Organization: ve2bmq
Lines: 42
Message-ID: <[e-mail]>
References: <56vmav$[e-mail]> <56tv84$[e-mail]> <570nl6$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: p41.rocler.qc.ca
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X-Mailer: Mozilla 3.0 (Win16; U)

> >K.R.Burtchaell <[e-mail]> wrote:
> >>I am looking for an adhesive to stick to teflon dielectric or a way to
> >>treat teflon dielectric to enable metal to be glued to it.Can anybody
> >>help?  73  Ken W6GHV
> >>
>
> You can "sort of" get Teflon to stick by the above method. But it isn't
> very strong. I've used contact cement when I just wanted a piece of it to
> hang on for a while.
>
> I asked the local plastics man about glue for Teflon and nylon. He has
> been looking for a decent product for years. He told me that every one
> that has been on the market has not satisfied him.
>
> Teflon is fairly easy to machine; depending on your needs if you have a
> fairly thick piece you can drill and tap it for screws.
>
> Zack W9SZ
>
> --

The only proper way to glue PTFE (Teflon) is to chemically "burn" the
surface with one of the chemical mixtures sold for that purpose.  These
mixtures contain free sodium metal (or similar alkali metal) in solution
and are very unstable and toxic (meaning dangerous to handle).  Not
recommended for amateurs.

The best way is to purchase PTFE that is already surface treated (it
will have a dark brown appearance on the surface).  Most commercial PTFE
suppliers will be able to supply it at least in the thinner sheet
material.  Then you can glue it with any suitable "flexible" glue like
contact adhesive.  Some years ago I made a large number of electrical
coils potted in polyurethane with a PTFE disk glued to one face by this
method and they stood up very well.

This also explains why all PTFE self adhesive tape that is available has
a dark brown appearance.  Which brings up a point.  If all you need is a
thin layer of PTFE glued to a surface, self adhesive tapes are available
in thickness up to at least 5 mil.

Burt>>>



From [e-mail] Mon Nov 25 19:06:59 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.deltanet.com!news.deltanet.com!jlundgre
From: [e-mail] (John Lundgren)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Followup-To: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
Date: 21 Nov 1996 13:37:08 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 51
Message-ID: <571lu4$[e-mail]>
References: <[e-mail]> <566aot$[e-mail]> <56f1bi$pp6$[e-mail]> <56tk6v$[e-mail]> <570rk5$[e-mail]>
NNTP-Posting-Host: delta1.deltanet.com
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Xref: news1.epix.net rec.radio.amateur.homebrew:21277 rec.radio.cb:38009 sci.electronics.design:26216 sci.electronics.misc:17649

Dana Myers ([e-mail]) wrote:
: In article <56tk6v$[e-mail]>,
: Wilbert Knol <[e-mail]> wrote:
: >[e-mail] (tyler) wrote:
: >
: >
: >>>>The standard varactor FM modulator does not inherently add pre-emphasis,

: >>>>so an external pre-emphasis network is used to allow PM and FM radios
: >
: >>Being relatively new to this NG, what is pre-and de-emphasis exactly?  I k
now
: >>it's used in FM communications, but how and why?
: >
: >The de-emphasis at the receiver end cancels pre-emphasis at the
: >transmitter. Pre-emphasis accentuates the higher frequencies in the
: >transmitted audio passband. The overall effect is a neutral transfer.
: >
: >I understand the reason for this trickery is to attenuate high
: >frequency noise from the FM demodulator.

: Well, back in the old days, we had all these phase modulated radios,
: and there's an inherent pre-emphasis in the phase modulation process.

: So, to get a flat audio response (or something even close), you have
: to have de-emphasis at the receiver end.  Of course, there's an inherent
: advantage with respect to high frequency noise reduction...

THe "inherent advantage" was not something that came by accident.
Armstrong's FM _System_, that he developed and patented, based its
superior performance on preemphasis.  We're talking about the wideband
commercial BCB FM, of course.


: --
:  * Dana H. Myers K6JQ, DoD#: j  | Views expressed here are mine and should *
:  * [phone]               | not be interpreted or represented as     *
:  * [e-mail]      | those of Sun Microsystems, Inc.          *


--
#===================================================================#
|    John Lundgren - Elec Tech - Info Tech Svcs. |    jlundgre@     |
|    Rancho Santiago Community College District  |   deltanet.com   |
|     17th St at Bristol \ Santa Ana, CA 92706   | http://www.rancho|
| My opinions are my own, and not my employer's. |    .cc.ca.us     |
|   Most FAQs are available through Thomas Fine's WWW FAQ archive:  |
|http://www.cis.ohio-state.edu:80/hypertext/faq/usenet/FAQ-List.html|
|     "Babe Ruth struck out 1,330 times...  keep on swinging."      |
|     says the lid on the jar of Laredo & Lefty's Picante Salsa     |
!  You MAY NOT use my email address for unsolicited Email or lists! !
#======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#



From [e-mail] Mon Nov 25 19:07:00 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!math.ohio-state.edu!uwm.edu!fnnews.fnal.gov!cbgw1.lucent.com!nntphub.cb.lucent.com!news
From: [e-mail] (Rob Whitacre)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial VHF low radios.  Which ones have easily scavenged PAs for 6 FM ?
Date: 21 Nov 1996 13:59:28 GMT
Organization: Lucent Technologies, Columbus, Ohio
Lines: 36
Message-ID: <571n80$[e-mail]>
References: <56o32s$[e-mail]>
NNTP-Posting-Host: cbpcrtwh.cb.lucent.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <56o32s$[e-mail]>, <Unknown> says...

>The G.E. MASTR II and MASTR Executive II low band mobile radios are excellent

donors
>for high power P.A.'s.  Just make sure that the radio is a "high split" i.e.
42-50 mHz
> unit.
>
>Also, you'll have to pad down or otherwise reduce the power output of your
exciter to
>a few hundred milliwatts as that is the drive level that these P.A.s require.
>Mail me if you need any other information.
>
>Steve, WB6TNL
><[e-mail]>

I agree with Steve, the Mastr II and Exec II are good choices. The PA section
comes right off the back of the radio, and one of the two relays you will
need, as well as a low pass filter, is already there.

Another possibility is the PA section from an RCA TAC 300. The back of the
radio, like the GEs, is a heatsink with the power amp, antenna relay and low
pass filter. This amplifier uses an MRF 492, which can take the 5 watts from
your radio and put out 60 watts or so.  There are a couple of capacitor
changes to be made; if you find some of these radios and need the information,

let me know. I have converted several EXEC IIs and TAC 300s to 6, and they all

worked great.

Keep your eyes open for amplifiers made by TPL for 30-50 MHz, which will do
the same thing. I have used a couple of these for 6 meter amps. They put out
60 or 70 watts for 5 watts in. They are black "brick" type amps. I see alot of

high band ones at hamfests, so make sure you get a low band model (the high
band ones aren't bad for 2 meters).

73, Rob W8RW



From [e-mail] Mon Nov 25 19:07:01 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!news.sprintlink.net!news-peer.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news1.sunbelt.net!usenet
From: [e-mail] (Jerry Flanders)
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: AC Power 60 HZ Freq Meter FS
Date: Thu, 21 Nov 1996 15:26:32 GMT
Organization: Info Avenue INTERNET Access
Lines: 18
Message-ID: <571s90$[e-mail]>
NNTP-Posting-Host: ags-r2-p14.groupz.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news1.epix.net rec.radio.amateur.boatanchors:626 rec.radio.amateur.homebrew:21259

Set your Field Day generator:

>FOR SALE: Frequency meter that covers 40 to 70 Hz, 115 V.

>It is in a nice-looking case, about 7"x9"x9", with a carrying handle.
>The readout is on a 5" wide "analog" meter.

>It is a high-quality military-type unit, and even has a calibration
>sticker on it. Weighs 4-5 pounds.

>Sell it for $50 plus UPS.

>Jerry Flanders          W4UK       [e-mail]







From [e-mail] Mon Nov 25 19:07:02 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!news.sgi.com!sdd.hp.com!col.hp.com!news.dtc.hp.com!hplntx!news
From: Jim Johnson <[e-mail]>
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Thu, 21 Nov 1996 08:33:34 -0800
Organization: Hewlett-Packard Laboratories
Lines: 20
Message-ID: <[e-mail]>
References: <56bbbe$[e-mail]> <[e-mail]>
NNTP-Posting-Host: jjohnson.hpl.hp.com
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Xref: news1.epix.net alt.radio.digital:1612 rec.radio.amateur.digital.misc:20203 rec.radio.amateur.dx:1360 rec.radio.amateur.equipment:42728 rec.radio.amateur.homebrew:21261 rec.radio.amateur.misc:118550 rec.radio.amateur.space:8859 rec.radio.shortwave:88854 alt.ham-radio.packet:202

Tim Connolly wrote:
>
> KW5Q wrote:
> >
> > I have uploaded to Simtel.Net:
> >
> > http://www.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
> > ftp://ftp.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip   1032518 by
tes
> >
> > sbfft11.zip     Sound Blaster spectral display and filtering
> >


   This sounds very similar to the product that Brian Beasley (sp) sells
for about $100 ... is that the case or am I missing the boat?

   Tnx,

   Jim W6SC
   [e-mail]


From [e-mail] Mon Nov 25 19:07:03 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!enews.sgi.com!news.sgi.com!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!dickrb
From: [e-mail] (Dick Bingham)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: YIG oscillators home brew?
Date: 21 Nov 1996 16:35:32 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 25
Message-ID: <5720ck$[e-mail]>
References: <01bbd588$29793b20$2d4697c2@marc'scomputer>
NNTP-Posting-Host: hplssb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Hi - You will be hard-pressed to make your own YIG oscillator. There
     are many subtle things involved in building such a beast! For
     example:

      - Obtaining a YIG sphere

      - You will have to have some sort of physical structure to
        correctly position the sphere (X/Y/Z axis) in the magnetic
        field.

      - Correct drive level to prevent 'squegging'-type oscillations.

      - Designing a suitable magnetic structure.

      - The completed device drifts terribly freq-wise unless you
        provide a reasonably stable thermal environment for the YIG
        and have chosen the best X/Y/Z position w/r/t thermal drift,
        squegging, and localized freq drop-outs.

These are just a few points that come to mind after many years of
working with YIG structures. I've built 1000's of these devices years
ago (designer and pdn-engr) and they do have many good features.

73 de w7wkr



From [e-mail] Mon Nov 25 19:07:04 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!news.mathworks.com!news.kei.com!news.texas.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!news.omnes.net!news.sinet.slb.com!griffin-mac.ridgefield.sdr.slb.com!user
From: [e-mail] (Douglas Griffin)
Newsgroups: sci.geo.satellite-nav,rec.boats.electronics,rec.boats.cruising,rec.boats,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: home-brew DGPS receiver
Date: Thu, 21 Nov 1996 12:14:32 -0500
Organization: Schlumberger-Doll Research
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: griffin-mac.ridgefield.sdr.slb.com
Xref: news1.epix.net sci.geo.satellite-nav:29529 rec.boats.electronics:1164 rec.boats.cruising:27642 rec.boats:130073 rec.radio.amateur.misc:118578 rec.radio.amateur.homebrew:21274

I am looking for an alternative to the commercial ~$450 DGPS receivers.
Does anyone have information to build a home-brew DGPS receiver to make
use of the 250 - 350 KHz marine radio DGPS beacons in the US and Canada?
Please email to [e-mail].

Thanks,

Doug

---------------------------------------------------------------------
Douglas Griffin                    [e-mail]


From [e-mail] Mon Nov 25 19:07:05 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!tezcat!feed1.news.erols.com!dciteleport.com!phase2.worldnet.att.net!netnews.worldnet.att.net!uunet!in1.uu.net!holonet!colossus.holonet.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: My new Amateur Radio page
Date: Thu, 21 Nov 1996 11:29:53 -0600
Organization: Internet Tech Services
Lines: 16
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 45.205.151.157.in-addr.arpa
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (Win95; I)

This is my new Amateur Radio web page...

http://linc2.lincup.com/~tstatham

Please check it out and let me know what you think.
I know it is slow, but is it worth the load time? I
would appreciate any ideas for improvement. I am new to
web page design and this is a learning experience for
me. Thanks in advance.

Tommy
N5HTQ

--
To see what the Godfather of Marketing Technology is
doing today visit http://www.enlow.com


From [e-mail] Mon Nov 25 19:07:06 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!newsfeed.uk.ibm.net!arclight.uoregon.edu!feed1.news.erols.com!howland.erols.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <570nr4$[e-mail]>
Date: Thu, 21 Nov 1996 19:34:57 GMT
Lines: 34

In article <570nr4$[e-mail]> [e-mail] (TIEMANN B
RUCE) writes:
>In article <[e-mail]>,
>John Mcleod  <[e-mail]> wrote:
>>Does anyone know :
>>  Is it possible to use my 30Mhz SWR meter to measure the swr in the
>>6 meter band ? What is it that determines the bandwidth of the meter ?
>>Would I have to change the sensor head, or do I just have to bite the
>>bullet and spend out money for a new one ?
>
>Before buying a new one, give the following a try:  Hook up a dummy
>load to the tuner, one that will present a nice 50 + j0 ohm impedance,
>and see what the meter thinks the SWR is.  Then give it a 100 + j0
>load, and 25 + j0 load.  These should be 2:1.  Etc.  Probably they won't
>be right on, but before you throw that one out the window, repeat
>the experiment with 30 MHz!  I use an MFJ-949D tuner for 6m though
>they're rated for only up to 30 MHz.  The readings are off at 6m, and
>only slightly less off for 10m.  If what you want the meter for is
>to see where the dip is, and not to know the precise value of the
>SWR, then even is the meter is quite off, it will still work.

Well, maybe. One more test you should do. Put the meter in line
with a good dummy load, read forward and reverse. Now reverse the
connections to the meter and read forward and reverse again. If
the first forward reading doesn't match the second reverse reading,
and if the first reverse reading and the second forward reading
aren't very close to nil, the meter doesn't have enough directionality
to trust.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Nov 25 19:07:08 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb,sci.electronics.design,sci.electronics.misc
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From: [e-mail] (Gary Coffman)
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <566aot$[e-mail]> <56f1bi$pp6$[e-mail]> <56tk6v$[e-mail]> <570rk5$[e-mail]>
Date: Thu, 21 Nov 1996 19:57:40 GMT
Lines: 65
Xref: news1.epix.net rec.radio.amateur.homebrew:21265 rec.radio.cb:37992 sci.electronics.design:26187 sci.electronics.misc:17620

In article <570rk5$[e-mail]> [e-mail] (Dana Myers) wri
tes:
>In article <56tk6v$[e-mail]>,
>Wilbert Knol <[e-mail]> wrote:
>>[e-mail] (tyler) wrote:
>>>>>The standard varactor FM modulator does not inherently add pre-emphasis,
>>>>>so an external pre-emphasis network is used to allow PM and FM radios
>>>Being relatively new to this NG, what is pre-and de-emphasis exactly?  I kn
ow
>>>it's used in FM communications, but how and why?
>>
>>The de-emphasis at the receiver end cancels pre-emphasis at the
>>transmitter. Pre-emphasis accentuates the higher frequencies in the
>>transmitted audio passband. The overall effect is a neutral transfer.
>>
>>I understand the reason for this trickery is to attenuate high
>>frequency noise from the FM demodulator.
>
>Well, back in the old days, we had all these phase modulated radios,
>and there's an inherent pre-emphasis in the phase modulation process.
>
>So, to get a flat audio response (or something even close), you have
>to have de-emphasis at the receiver end.  Of course, there's an inherent
>advantage with respect to high frequency noise reduction...

For a graphic demonstration of why pre-emphasis is necessary,
look at a spectrum analyzer display of a PM transmitter modulated
with pink noise. The close-in spectrum will look roughly like
this:

               |
           ----|----   Fig 1
           |   |   |
           |   |   |
---------------------------

Now repeat the test with a FM transmitter *without* pre-emphasis.
It'll look like this:

               |
              /|\     Fig 2
            /  |  \
           |   |   |
---------------------------

Put the pre-emphasis in and it'll look like this (hopefully):

               |
           ----|----   Fig 3
           |   |   |
           |   |   |
---------------------------

Pre-emphasis equalizes the energy in the transmitted spectrum of
a FM system at all modulation frequencies. That maintains a constant
SNR at high and low modulation frequencies. A FM discriminator
has a response that's the inverse of figure 2, so if you don't
put de-emphasis in the receiver you'll get excessive high frequency
energy in the recovered modulation of a PM signal or a pre-emphasized
FM signal.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Nov 25 19:07:09 1996
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From: [e-mail](Stanley D Gruver)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.dx,rec.radio.amateur.homebrew,rec.radio.amateur.misc,
Subject: FOR SALE!!!!!!!!!!! Satellite Receiver
Date: 21 Nov 1996 20:16:18 GMT
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Xref: news1.epix.net rec.radio.amateur.antenna:31826 rec.radio.amateur.dx:1358 rec.radio.amateur.homebrew:21258 rec.radio.amateur.misc:118547


   Used

   Toshiba TRX 80 with VC2+      $275
   Panasonic 4500 with VC2+      $275
   VC2+ descrambler              $150

   Receiver/VC2+/new feedhorn/new 20 degree LNB/new 24" actuator/new
   7.5' Perfect Ten mesh dish      Complete System for ONLY $625

   E-mail reply please      Thanks,   Maura




From [e-mail] Mon Nov 25 19:07:10 1996
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From: [e-mail] (Spencer Petri)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: HV PS Diodes
Date: 21 Nov 1996 21:18:57 GMT
Organization: Your Organization
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These are 25KV diodes and I did a test run of 1.2Amps at 4 hours.
Perfect for that big amp.  $10 each or 4 for $35 + $3 postage.

73 de Pete  WA5JCI



From [e-mail] Mon Nov 25 19:07:11 1996
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From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: 21 Nov 1996 21:21:23 GMT
Lines: 46
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In article <[e-mail]>, [e-mail] says...
>
>Does anyone know :
>
>  Is it possible to use my 30Mhz SWR meter to measure the swr in the
>6 meter band ? What is it that determines the bandwidth of the meter ?
>Would I have to change the sensor head, or do I just have to bite the
>bullet and spend out money for a new one ?
>
>John Mcleod N6RCD


I've been using a cheap Vanco $10 CB-type VSWR meter since the mid
1970s on all bands from 80m through 2m, and it works just fine.  The
"purists" will argue that the VSWR measurement is not accurate, and
they're absolutely correct.  But who cares?  What does the meter
reading actually matter?  You adjust your antenna system for the
minimum reflected power (whatever that may be) and that's it.  You
get it as low as it will go, and that's as low as it will go.  The
actual numbers don't matter.  I've heard "newbies" on 2m complaining
that they spent hours and hours trying to get the VSWR on their 2m
antenna from 1.3:1 down to 1.2:1 and couldn't do it, and they were
genuinely in a panic about it.  Must've been former CBers.  I know
I felt that way when I made the transition from CB to ham back in
the 1970s.  Then I learned the truth about VSWR, and now I really
don't worry.  Anything below 2:1 is tolerable, and anything below
1.5:1 is down-right great!

Use the meter you have, and don't waste your money on another one,
unless you're one of those anal-retentive types who's hooked on
numbers.

73 from Texas!

--
Dean W. Hemphill                      Email: [e-mail]
PO Box 328                            Home:  [phone]
Lake Dallas, Texas 75065-0328         Work:  [phone]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amateur radio operator KC5NG, Extra Class, VE (ARRL/W5YI), QRPer, CW op
Ford Mustang enthusiast ('66 coupe, '69 GT-350, '72 conv, '95 GT conv)
Die-cast model car collector (Ford products only, in all scales)
Plastic model car builder (Ford products only, 1:24 and 1:25 scale)
Glass insulator collector (specializing in "oddball" pieces)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



From [e-mail] Mon Nov 25 19:07:12 1996
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From: TMAN <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: gaasfet prints
Date: Thu, 21 Nov 1996 13:37:08 -0800
Organization: LUCKY  7 SOFTWARE
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HI

Looking for some prints on how to build your own gaasfet preamp.

Thanks for any help.
TMAN
[e-mail]


From [e-mail] Mon Nov 25 19:07:13 1996
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From: Roland Burgan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8 Hz lightning receiver ????
Date: Thu, 21 Nov 1996 16:52:41 -0500
Organization: up.net
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CC: [e-mail]

One way to monitor lightning activity is to turn on an AM Broadcast
radio and set the dial to an unused frequency at the higher end of
the dial. Cheap and effective.

Bart Mudde wrote:
>
> Hello OM, who knows something about a receiver for lightning ?
> I was told, the activities can be monitored with a 8 Hz receiver, but is
> it possible to built something like that. It very very low ofcourse and
> is it true ?
> I am always very curious and interested in thunder etc. so when it is
> possible to built something please let me hear.
> 73 es cuagn de Bart PA3GGM.


From [e-mail] Mon Nov 25 19:07:15 1996
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From: Charlie Panek <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CQ June'96 QRN Squasher, does it really work ?
Date: Thu, 21 Nov 1996 15:42:01 -0800
Organization: Hewlett-Packard Co.
Lines: 66
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References: <56tl7r$[e-mail]>
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To: Peter Shintani <[e-mail]>

Peter Shintani wrote:
>
> Hi:
>         I had trouble finding the specified FET, so I used a similar 2SK125
fet.
> The circuit worked but the frequency response was uneven and peaky.
> It turned out that the RF choke I was using was  self resonant at 1 MHz or
> so. I searched and searched but I could not find a suitable RF choke that ha
d
> the specified 2.7 mH of inductance with a suitably high self resonance.
> ( I have feeling that a smallL would be ok.)
> I gave up on the design. I had afew NEC upc1651 rf amp ic's. I replaced
> the two gain stages with the upc's and used a simple hybrid combiner to
> add the two signals.I have still to check the operation. But the
> frequency response is now flat for the main antenna path up to
> atleast 100 MHz, that is the measurement limit of my gain phase
> analyzer. The Noise antenna path is -8 dB at 100 MHz.
>          I was wondering if anyone else had any luck with thie CQ QRN Squash
er
> as published and or knew of any mod's to fix or improve the performance.
> I noticed that commercially available units have some sort of preselector
> feature, it's lacking in the CQ ciruit, perhaps it is necessary ?
>         RSVP via email is appreciated
> [e-mail]
> PEter
Peter:

  I bread-boarded the circuit up and it seemed to work ok on the bench.
I also used FET's that I had on hand.  For Q3 and Q2 I used a National
J309 For Q1, I used a 2N5245.  (I would have used J309's for all 3, If
I'd had another.) My gain was a little peaky, maxing at 28dB at 1.2
MHz, then rolling off to about 15dB at 14 MHz, and rolling off more slowly
to about 6 db at 50 MHz.  This is for the "Main antenna" input.
  The gain on the sense antenna input varies as you fiddle with
the phase and balance controls, of course, but with both adjusted
for max gain, I got a peak of 25 dB at 0.5 MHz, rolling off rapidly
to only 5dB at 10 MHz, but then it was flat out to about
35 MHz or so.  I really wanted to use the circuit on 6m,
where I have a chronic intermittent line noise problem, but the
gain might be too low there.

  I just used a regular old 2.7mH molded choke for RFC1.  As long as the
self-resonance is a parallel resonance, (it should be!) the choke should
have sufficent impedance to function properly.  I just looked at mine
on the impedance analyzer.  It had an self resonance at around 2 MHz, but
the impedance was still 3k ohms at 40 Mhz, which should still be adequate.

  I'm not sure why you need a really flat response, although having a
peak down in the BC band worries me; you'd be asking for overload
problems with a local BC station.  A preselector might not be a bad idea,
especially if you were in such a situation.

  I suspect that maybe DeMaw was thinking mostly about 160m operation.
He mentions it a couple of times in the article.  If you wanted to
sacrifice gain at the low end, you could probably optimize the circuit
for a bit more gain at the high end.

  All that said, there's nothing wrong with using the MMIC's, though the
noise figure might not be quite as good as a good JFET.  ( I don't have a
data sheet for the 1651's but the 1653's have a NF of around 5dB.)
I also wonder about their dynamic range relative to the JFETs.

  Gee, you've inspired me to take my breadboard home this weekend and
hook it up to a real antenna and radio, and see if it works.

--
Charlie Panek KX7L              Hewlett Packard Company
[e-mail]            Lake Stevens Division
                                Everett, Washington


From [e-mail] Mon Nov 25 19:07:16 1996
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From: Lawrence Davis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want: VHF / UHF SWR Meter plans
Date: Thu, 21 Nov 1996 18:59:12 -0500
Organization: AT&T WorldNet Services
Lines: 21
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References: <[e-mail]>
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Bob Berg wrote:
>
> hello,
> Looking for plans to build a VHF/ UHF  2m-70cm SWR Meter.
> up to 50 Watts power handling capabilities.
> Does anyone have any plans or know how to build one.  Any information
> would be greatly appreciated.
> Thanks
> N1YCH
> Bob Berg
> [e-mail];
   You would be able to determine the VSWR using a DIRECTIONAL COUPLER and
some simple math.  If you would like the plans, I can scan them and send them
as an "image" file.  Let me know what type of file you would like the plans
in. (TGA,GIF etc...)
   The plans are from The ARRL Antenna Book.

   73's
   WB8VPC
   Larry
   Summit County, Oh.


From [e-mail] Mon Nov 25 19:07:17 1996
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From: Christopher Trask <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Syncronous Noise Blanker Idea
Date: 21 Nov 1996 18:20:04 -0700
Organization: Primenet [phone]
Lines: 48
Message-ID: <572v44$[e-mail]>
References: <[e-mail]>
X-Posted-By: ctrask@206.165.5.108 (ctrask)

Rob Frohne <[e-mail]> wrote:
: Hi,

: The other day I had an idea.  The idea was for a syncronous noise
: blanker.

: So anyway, my idea is this:  Assuming the noise is coming from arcing of a
: 60 Hz source, actually the same 60 Hz source I'm powering my radio on, and
: assuming it happens on peaks, then it will happen 120 times a second.  Why
: not build a blanker that triggers on the 60 Hz line signal and that has an
: adjustable blanking interval time and adjustable delay from the trigger?

Hmmm...
        This sounds like an interesting application for a circuit known as
a commutative filter.  Little has been written about this, although Moto-
rola once had an application note on the subject.  I have built a number
of these, usually using an NE565 PLL to lock onto a periodic signal.  The
signal and all of it's harmonics are reconstructed by synchronously sampl-
ing the waveform in time.  The phase relationship between the harmonics is
preserved, and a little post-filtering removes the switching transients
from the reconstructed waveform.

        Some references are:

        1.      Visel, Thomas A., "Narrowband Digital Filter Achieves High
                Qs," Electronics, Nov 22, 1973, pp. 118-119

        2.      Broeker, Bud, "Commutating Filter Techniques," Motorola
                Application Note AN-534

        3.      LePage, W.R. et al  "Analysis of a Comb Filter Using
                Synchronously Commutated Capacitors," AIEE Transactions,
                Part 1, March 1953, pp. 63-68. (This is a mechanical
                implementation, but gives a full math development)

        4.      Hickman, Ian, "Analog Electronics," CRC Press, 1990,
                pp. 179-182.

                                          Regards,

                                          Chris

------------------------------------------------------------------------------
Chris Trask / N7ZWY                       Circuit Design for the RF Impaired
ATG Design Services                       __  __     ____  ___       ___ ____
[e-mail]       _~_            /__)/__) / / / / /_  /\  / /_    /
                         (@ @)          /   / \  / / / / /__ /  \/ /___  /
----------------------ooO~(_)~Ooo---------------------------------------------


From [e-mail] Mon Nov 25 19:07:18 1996
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From: [e-mail] (tim)
Newsgroups: rec.radio.amateur.homebrew
Subject: Yaesu mic. pinout
Date: Fri, 22 Nov 96 01:32:36 GMT
Organization: fudpuckers
Lines: 8
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Reply-To: [e-mail]
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X-Newsreader: News Xpress 2.0 Beta #2

Hello,
 I need the pinout of an Yaesu mic. mod# MD-1 c8  to adapt it to an Icom radio
thanks in advance   Tim Phillips KF4FCO-EM-70

              Tim KF4FCO-EM70 Spamless Ham REPLY WITH CARE
             I'AM PC HANDICAPED AND I TYPE WITH TWO FINGERS
              AND I SUFFER FROM LAP TOP FEVER!!!!!!!!!!!!!!
             :*********************************************]


From [e-mail] Mon Nov 25 19:07:20 1996
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
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From: Bob Sull <[e-mail]>
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Message-ID: <[e-mail]>
Date: Thu, 21 Nov 1996 18:03:37 -0800
References: <56bbbe$[e-mail]> <[e-mail]>
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Tim Connolly wrote:
>
> KW5Q wrote:
> >
> > I have uploaded to Simtel.Net:
> >
> > http://www.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
> > ftp://ftp.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip   1032518 by
tes
> >
> > sbfft11.zip     Sound Blaster spectral display and filtering
> >
> > Features:
> >  * Sound Blaster 16 (or 100% compatible) input and output.
> >  * Band widths of 2K, 4K, 8K or 16K Hz.
> >  * Spectral resolutions of 1 Hz to 16 Hz per pixel.
> >  * Display of power spectral density with any of 4 color maps in either
> >     linear or logarithmic scale.
> >  * Define and use as many as to six filters simultaneously -- band pass,
> >     band stop, low pass, and high pass.
> >  * Filters are defined graphically by mouse movement based upon
> >     the displayed spectrum.  Once you see a signal, you can
> >     quickly define a pass or stop filter around the signal by clicking
> >     and dragging the mouse.
> >  * Net filter passband is displayed at all times.
> >  * Filters can be selectively enabled and disabled by a single
> >     keystroke.
> >
> > Special requirements: DOS 3.0 or higher, SB16 or 100% compatible, SVGA,
> >                       VESA modes 101, 105, mouse.
> >
> > Copyrighted Freeware.  Uploaded by the author.
> >
> > Kevin - KW5Q
> >
> > [e-mail]
> >
> > $$e^{-\frac12 K^2} \frac d{dK} e^{\frac12 K^2}e^{\sqrt{in}}$$
> > Kevin McWilliams
> > KW5Q
> > Applied Mathematician
>
> Could you explain what this software is used for, thanks!
> Sounds like something I have been interested in.
>
> -- Tim Connolly
> -- Vienna Computer Services & World Wide Web Advertising
> -- http://www.midohiovalley.com/vcs
> -- mailto:[e-mail]

Better yet, explain what this has to do with DX?

Later,
Bob
--
            <> Bob Sull  WA8IMO <>
   "73, CUL, es keep the FUN in Ham radio."
>Life Member-ARRL  QCWA< >Member-NODXA  NCDXF<
          >DXCC  WAS  RCC <  >8P9BC<
             >QSL Mgr for 8P6JG<
          >WA8IMO@NO8M.#NEOH.OH.USA<
             >[e-mail]<



From [e-mail] Mon Nov 25 19:07:20 1996
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From: Mike <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Yaesu mic. pinout
Date: Thu, 21 Nov 1996 19:00:30 -0800
Organization: Fishnet Internet Services
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Hello Tim,
The pin out on the MD-1 mic plug is as follows. Note that the notch is at
the 12 oclock position.
1. up
2. +5v
3. down
4.
5.
6. ptt
7. gnd
8. mic

I took this from the tech manual. The pin dia in my Yaesu ft736r shows
pin 4 and 5 as "fast", but the tech manual does not show and connections
good luck, Mike K6YPB


From [e-mail] Mon Nov 25 19:07:22 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: NBFM modulator: newbee help: what is de-emphasis exactly?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <566aot$[e-mail]> <56f1bi$pp6$[e-mail]> <56tk6v$[e-mail]> <570rk5$[e-mail]> <571lu4$[e-mail]>
Date: Fri, 22 Nov 1996 08:20:37 GMT
Lines: 46

In article <571lu4$[e-mail]> [e-mail] (John
 Lundgren) writes:
>Dana Myers ([e-mail]) wrote:
>: Well, back in the old days, we had all these phase modulated radios,
>: and there's an inherent pre-emphasis in the phase modulation process.
>
>: So, to get a flat audio response (or something even close), you have
>: to have de-emphasis at the receiver end.  Of course, there's an inherent
>: advantage with respect to high frequency noise reduction...
>
>THe "inherent advantage" was not something that came by accident.
>Armstrong's FM _System_, that he developed and patented, based its
>superior performance on preemphasis.  We're talking about the wideband
>commercial BCB FM, of course.


Pre-emphasis equalizes the energy in the transmitted spectrum
of a direct FM signal so that it matches that of a PM signal
(the most common way to do "FM" in the early days). That has
the effect of improving SNR for high modulation frequencies
(which otherwise would be worse than for low frequencies, see
spectrograms I posted in another message). It doesn't give WBFM
its superiority in gaussian noise over AM, however. One could
add pre-emphasis to an AM signal as well, but wouldn't get the
benefits of WBFM noise reduction. (What you'd get in that case
would be *worse* low frequency baseband noise.)

The major advantage of WBFM is due to use of a modulation index
in excess of 1. That yields the FM enhancement effect, which is
really a crude form of spread spectrum. The signal energy is
spread over a fairly wide bandwidth during transmission and
collapsed back down to baseband during reception. This yields
an improvement in baseband SNR in excess of the naive CNR.
This is the same mechanism responsible for "coding gain" in
a DS spread spectrum signal. The reason it works is that the
signal energy is coherent, and adds when collapsed back down
to baseband, but the noise is random and does not add when
collapsed to baseband. Thus baseband S/N is better than the
channel carrier to noise ratio. With AM, CNR and SNR are the
same.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Nov 25 19:07:22 1996
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From: [e-mail] (Andrew John Burge)
Newsgroups: rec.radio.amateur.homebrew
Subject: Valves for 50 MHz
Date: Fri, 22 Nov 1996 08:46:39 GMT
Organization: Dungeon Network Systems
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Has anyone any idea if my ancient 807's are likely to produce more
than heat from the anode on 6M ?  Also I have some 12BY7A's here too
which are often used as HF rig pre-final driver FT101Z etc.  Are these
likey to produce anything on 6M ?

Any info would be a help - its a junk box project and I'm trying to
make a simple xtal TX without having to buy anything.  I have some
4CX250B's but these are a bit over the top ...

Andrew
G6ALB




From [e-mail] Mon Nov 25 19:07:23 1996
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From: [e-mail] (morethanone kalar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: rf grounding
Date: Fri, 22 Nov 1996 03:24:19 -0600
Organization: stark ravin'
Lines: 27
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References: <56u1jv$[e-mail]> <[e-mail]>
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> Queston:  Can anyone explain what the "ideal" grounding situation is for a
> ham
> station. My shack is in a basement area. The tvi on cable is quite severe.
>
> The antenna is a GAP vertical only 10 feet from the house. On 40 meters,
> when the amp is on (1 kw) it triggers a relay switch for the doorbell
> (also located in the basement shack area).

I have a couple of good options for ya. Guess which one is serious?

1) TVI isn't a problem nowadays. The interference is better than the
programming.

2) Contact the Center for Disease Control and tell them you want to be a
human guinea-pig in a self-conducted radiation cancer test.

3) Connect a relay to the transmitter that disables the doorbell relay
while you're transmitting. Put a manual override in there and you can
use the doorbell relay for a CW monitor.

4) Put the vertical on the roof with a decent radial system.

5) Hot glue several fluorescent "halo" lightbulbs on the ceiling of the
shack. Visitors will be really impressed by your "light show". Only
charge your friends half price.

-- Tony W0RHX


From [e-mail] Mon Nov 25 19:07:24 1996
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From: [e-mail] (RAYMOND K WEBB)
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 22 Nov 96 09:58:49 GMT
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unsubscribe [e-mail]


From [e-mail] Mon Nov 25 19:07:26 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 22 Nov 1996 12:01:47 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 58
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:
>Mr. Rauch appears not to have answered these seemingly-simple questions.
>How can we go over theories point by point if one party is pointedly less
>than forthcoming?

You seem to feel it OK for you to not respond to questions, yet after I
plainly posted I had to go off-line for two or three days you fire away
with nonsense about me not replying. So far you've claimed:

1.) The grid dissipation of an 8877 is several hundred watts, never mind
Eimac says 25 watts.

2.) The heating is by grid conductor resistance and not electron
bombardment, never mind the grid's surface resistance would have to be
hundreds of ohms or the grid current hundreds of amperes for this effect
to occur.

3.) Photons make gas-LESS tubes on standby blow up. Never mind a special
gas filled geiger muller tube only has fraction of a pico-ampere.

4.) Glass in Chinese 3-500Z's melts from parasitic current flow in what
you call poor dissipation factor glass. Never mind the thermal lag of the
glass or the electric field required.

5.) A capacitor can arc over from a parasitic but NOT HF energy. Never
mind the reactance of the capacitor is very low at VHF but high at HF.

6.) A band switch can arc over from VHF parasitics. Never mind the low
shunt reactance plate capacitor.

7.) A single point on a constant current characteristic curves can be used
to calculate dissipation. Never mind the operating conditions indicated
are off the charts.

8.) A relative harmonic level graph for a class C 4-65A can be applied to
an 8875 as a direct percentage of harmonic even though it isn't even in
percent.

9.) Adding a slightly resistive nichrome wire (how much Rich? Less than an
few ohms?) in the primary path of HF current affects VHF Q greatly, when
the VHF Q was already about unity at 100 MHz in the out of circuit
"conventional suppressor" you describe.

Yet after all that very obvious technical rubbish you put out, you claim I
am the one putting out the snow job, distorting facts, avoiding questions,
and thinking customers are "drooling idiots".

I am supposed to answer you and spend hours correcting nonsensical claim
after nonsensical claim,  while you are free to avoid any question or spit
out any response you choose. You, and in particular the magazine that gave
you a platform to publish such obvious technical garbage, should be
ashamed of what was done to people trying to learn. I think undoing the
damage is impossible.

More time arguing with you is simply wasted time.

73, Tom


From [e-mail] Mon Nov 25 19:07:27 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CQ June'96 QRN Squasher, does it really work ?
Date: 22 Nov 1996 12:01:48 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 24
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In article <[e-mail]>, Charlie Panek
<[e-mail]> writes:

>
>  All that said, there's nothing wrong with using the MMIC's, though the
>noise figure might not be quite as good as a good JFET.  ( I don't have a
>data sheet for the 1651's but the 1653's have a NF of around 5dB.)
>I also wonder about their dynamic range relative to the JFETs.
>
>  Gee, you've inspired me to take my breadboard home this weekend and
>hook it up to a real antenna and radio, and see if it works.
>
>--
>Charlie Panek KX7L

I did a longhand analysis of this circuit and could find no source of
phase shift, other than a 180 degree flop as zero amplitude was crossed
with either pot.

Later on, I breadboarded the phase circuit section up through the JFET,
and measured it on a Harris Vector voltmeter. It had, as theory indicated,
almost NO phase shift other than a 180 degree flop when zero is crossed.

73 Tom


From [e-mail] Mon Nov 25 19:07:27 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: rf grounding
Date: 22 Nov 1996 12:01:50 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
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In article <[e-mail]>,
[e-mail] writes:

>TVI could be one
>of the more benign side effects  !!!

What would a less benign effect be?



From [e-mail] Mon Nov 25 19:07:29 1996
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From: miker <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: Fri, 22 Nov 1996 04:17:51 -0800
Organization: Hevanet Communications
Lines: 51
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Mustang Maniac wrote:
>
> In article <[e-mail]>, [e-mail] says...
> >
> >Does anyone know :
> >
> >  Is it possible to use my 30Mhz SWR meter to measure the swr in the
> >6 meter band ? What is it that determines the bandwidth of the meter ?
> >Would I have to change the sensor head, or do I just have to bite the
> >bullet and spend out money for a new one ?
> >
> >John Mcleod N6RCD
>
> I've been using a cheap Vanco $10 CB-type VSWR meter since the mid
> 1970s on all bands from 80m through 2m, and it works just fine.  The
> "purists" will argue that the VSWR measurement is not accurate, and
> they're absolutely correct.  But who cares?  What does the meter
> reading actually matter?  You adjust your antenna system for the
> minimum reflected power (whatever that may be) and that's it.  You
> get it as low as it will go, and that's as low as it will go.  The
> actual numbers don't matter.  I've heard "newbies" on 2m complaining
> that they spent hours and hours trying to get the VSWR on their 2m
> antenna from 1.3:1 down to 1.2:1 and couldn't do it, and they were
> genuinely in a panic about it.  Must've been former CBers.  I know
> I felt that way when I made the transition from CB to ham back in
> the 1970s.  Then I learned the truth about VSWR, and now I really
> don't worry.  Anything below 2:1 is tolerable, and anything below
> 1.5:1 is down-right great!
>
> Use the meter you have, and don't waste your money on another one,
> unless you're one of those anal-retentive types who's hooked on
> numbers.
>
> 73 from Texas!
>
> --
> Dean W. Hemphill                      Email: [e-mail]
> PO Box 328                            Home:  [phone]
> Lake Dallas, Texas 75065-0328         Work:  [phone]
> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> Amateur radio operator KC5NG, Extra Class, VE (ARRL/W5YI), QRPer, CW op
> Ford Mustang enthusiast ('66 coupe, '69 GT-350, '72 conv, '95 GT conv)
> Die-cast model car collector (Ford products only, in all scales)
> Plastic model car builder (Ford products only, 1:24 and 1:25 scale)
> Glass insulator collector (specializing in "oddball" pieces)
> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Yeah But:
I've had a number of cheapo SWR bridges.  Some of them work extremely
well on 2 meters.  Others don't even work well on CB.  The only
thing you can do is test it as suggested.


From [e-mail] Mon Nov 25 19:07:29 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
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Date: 22 Nov 96 12:19:36 GMT
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help


From [e-mail] Mon Nov 25 19:07:30 1996
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From: [e-mail] (Ray Williams)
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV
Date: Fri, 22 Nov 1996 14:50:21 GMT
Organization: Flash-Net Internet Service Provider, 888-FLASHNET
Lines: 6
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I am looking for information about homebrewing a ATV
transmitter/receiver if you have any infomation or know where I may
come about such.  Please email me at
[e-mail]
n5zso



From [e-mail] Mon Nov 25 19:07:31 1996
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From: [e-mail] (Glenn Elmore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: YIG oscillators home brew?
Date: 22 Nov 1996 15:25:55 GMT
Organization: Hewlett Packard Sonoma County
Lines: 30
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Dick Bingham ([e-mail]) wrote:
: Hi - You will be hard-pressed to make your own YIG oscillator. There
:      are many subtle things involved in building such a beast! For


Not to disagree with Dick (who has indeed interacted with YIG devices a
good deal and knows of the difficulties) but building a YIG oscillator
on a ham budget/resources *is* possible.

In fact, Horst Aichmann, DL5KR, has done just that. I believe he used a
packaged bi-polar as the active element  and pretty much built it on a
piece of copper clad with the coupling loop and YIG sphere pretty much
"air wired".

  I don't remember what magnet he used but I think if you are really set on
building one, he could probably help.


Glenn Elmore n6gn

amateur IP:     [e-mail]
Internet:       [e-mail]

|--------------- N6GN's Higher Speed Packet WWW Page -------------------|
|                                                                       |
|       http://www.tapr.org/~n6gn/index.html            |
|                                                                       |
|-----------------------------------------------------------------------|




From [e-mail] Mon Nov 25 19:07:32 1996
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From: [e-mail] (John Hudak)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8 Hz lightning receiver ????
Date: Fri, 22 Nov 1996 08:26:59
Organization: Institute for Materials Research
Lines: 18
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References: <[e-mail]>
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>I was told, the activities can be monitored with a 8 Hz receiver, but is
>it possible to built something like that. It very very low ofcourse and
>is it true ?

It depends on what aspect of lightning you're listening to.  Could you be
thinking of whistlers?  If so they're audible over a range of frequencies up
to around 10 kHz., and yes there are receivers for them.


____________________________________________________________________________
John Hudak                                               [e-mail]
Electron Optics
Brockhouse Institute for Materials Research
McMaster University
Hamilton, Ontario, Canada





From [e-mail] Mon Nov 25 19:07:33 1996
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From: Duncan Clark <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Valves for 50 MHz
Date: Fri, 22 Nov 1996 16:57:42 +0000
Organization: DNAmp Ltd.
Lines: 12
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Does anyone know if 572B's will also work on 6m?

Duncan
------------------------------------------------------------------------------
--
The problem with being on the cutting edge is that you occasionally get
sliced from time to time....

Dr. Duncan Clark
DNAmp Ltd.
TEl/FAX [phone]
http://www.prestel.co.uk/dnamp
http://www.genesys.demon.co.uk


From [e-mail] Mon Nov 25 19:07:34 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!oronet!usenet
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8 Hz lightning receiver ????
Date: Fri, 22 Nov 1996 17:40:14 GMT
Organization: RST Engineering
Lines: 22
Message-ID: <574oji$[e-mail]>
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Roland Burgan <[e-mail]> shared these priceless pearls of wisdom:
->One way to monitor lightning activity

->Bart Mudde wrote:
->> Hello OM, who knows something about a receiver for lightning ?

Way back when I was going to college, I had a job with an outfit called
Smythe Research in San Diego up by Montgomery Field.  As I _vaguely_
remember, the best receiver for lightning was tuned SOMEWHERE around 50
kHz.

Again, that was a HELL of a long time ago.  Anybody got any more recent
information?

Jim

Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1st phone---Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-A&P-FAA Counselor



From [e-mail] Mon Nov 25 19:07:35 1996
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From: Dave Morrow <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Transformer For Power Supply
Date: Fri, 22 Nov 1996 10:13:25 -0800
Organization: Cybergate Information Services
Lines: 11
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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I'm trying to build a 13.8v 20amp power supply and I'm having difficulty
locating a transformer. This project may be more difficult than I
thought. I'm looking for a 120v primary and 20v - 25v 10amp secondary or
something close. Of the places I've called they don't carry it or they
want $200.00 for it.

Any words of advise? Any ideas as to where to find a transformer at a
cut rate price?

Help!!
Thanks, Dave


From [e-mail] Mon Nov 25 19:07:36 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: 8 Hz lightning receiver ????
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Fri, 22 Nov 1996 19:42:16 GMT
Lines: 79

In article <[e-mail]> [e-mail] writes:
>Hello OM, who knows something about a receiver for lightning ?
>I was told, the activities can be monitored with a 8 Hz receiver, but is
>it possible to built something like that. It very very low ofcourse and
>is it true ?
>I am always very curious and interested in thunder etc. so when it is
>possible to built something please let me hear.
>73 es cuagn de Bart PA3GGM.

7.69 Hz is the self-resonant frequency of the Earth-Ionosphere channel.
Lightning discharges anywhere on Earth will excite standing waves in
this channel. Tesla discovered this in his Colorado experiments. As
thunderstorms move toward or away from your location, the standing
wave nodes will march across your location, peaking and fading according
to the distance between you and the storm, and you can detect them
with a suitable antenna and receiver.

Building a suitable receiver is not terribly hard. It is basically
a high gain selective audio amplifier. Putting up an effective
antenna may be much more challenging. Anything at all you can erect
is going to be a *very* short (in terms of wavelength) voltage probe
antenna. This will have an *extremely* high feedpoint impedance and
will almost certainly need an integrated MOSFET to transform it down
to something reasonable for the receiver. Protecting the gate of this
MOSFET from static charges is going to be a very hard job, even the
bias network is going to be difficult to build. You might be better
off with a tube.  Of course you could use a magnetic loop, but then
the impedance would be extremely low, so you still have problems.

It is a marvel that Tesla detected anything. His receivers had no
amplification, and even his huge antennas were still short in
comparison to a wavelength at this frequency. But manmade electrical
noise was a lot less in his day (excepting that he generated himself),
so simple receivers performed better than they can today.

7.69 Hz borders on being below the audible range, so you need a
chart recorder to monitor the output of your receiver. Or you could
use a data acquisition card with your PC to log the signals. There's
lots of interest to monitor throughout ELF, so a tunable receiver
and a speaker should be part of your plans.

Moving up out of ELF to merely VLF simplifies your problems considerably,
and there is still lightning energy to be detected there. In this region,
whistlers come to the front as the interesting thing to monitor. As you
move up in frequency above the audible range, you're going to have to add
a detector (a simple diode envelope detector) to your TRF receiver in order
to hear anything. What you'll hear is the slope of the magnitude curve of
the discharge energy. This can be interesting, but using a superhet with a
product detector may prove more interesting yet because now you'll hear
frequency shifts in the lightning discharge as well. At this point you
may want to consider an upconverter to your HF rig, if it doesn't already
cover VLF, instead of building a separate receiver.

Of course there is lightning energy to be detected all the way up into
VHF, but the discharge has to be *very* much closer to your location to
detect at VHF. This leads to a very useful monitor you can build. If
you couple a MW AM receiver and a VHF AM receiver (a aircraft band
scanner tuned to an unused channel will work) to a coincidence detector,
you can get warnings for when storms are within a few hundred miles
(crashes on the MW receiver), and when they are approaching your local
area (simultaneous crashes on *both* the MW and VHF receiver). By
monitoring both bands, you reduce the amount of false detections you
get of approaching storms. We used this scheme to automatically start
a backup generator when storms came into the local area.

Electrical noise is going to be the bane of your monitoring activities
in any event. You're going to become familiar with every malfunctioning
appliance within miles of your station, and grow to be on intimate terms
with your local power company's EMI suppression engineers. Monitoring
manmade EMI can be interesting in itself. You quickly learn the habits
of your neighbors. (Most battery powered vibrators give off a distinctive
ELF signal.)

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Nov 25 19:07:38 1996
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From: [e-mail] (Dave Rickmers)
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Fri, 22 Nov 1996 19:46:17 GMT
Organization: Earthlink Network, Inc.
Lines: 16
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Bob Sull <[e-mail]> wrote:


>> > $$e^{-\frac12 K^2} \frac d{dK} e^{\frac12 K^2}e^{\sqrt{in}}$$

>> Could you explain what this software is used for, thanks!
>> Sounds like something I have been interested in.
>>

>
>Better yet, explain what this has to do with DX?
>
You could use it to make difficult signals easier to copy, remove
heterodynes, etc.  Like the Watkins-Johnson dsp only cheaper.
dr



From [e-mail] Mon Nov 25 19:07:39 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transformer For Power Supply
Date: Fri, 22 Nov 1996 15:02:41 -0500
Organization: No Junk E-mail
Lines: 18
Message-ID: <[e-mail]>
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Dave Morrow wrote:
>
> I'm trying to build a 13.8v 20amp power supply and I'm having difficulty
> locating a transformer. This project may be more difficult than I
> thought. I'm looking for a 120v primary and 20v - 25v 10amp secondary or
> something close. Of the places I've called they don't carry it or they
> want $200.00 for it.
>
> Any words of advise? Any ideas as to where to find a transformer at a
> cut rate price?
>
> Help!!
> Thanks, Dave

Call C&H Sales (surplus) 1-800-325-9465 get a catalog. I see several
transformers that might fit your needs.

pht


From [e-mail] Mon Nov 25 19:07:40 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: ** RF Transmitter Design
Date: 22 Nov 1996 12:18:30 -0800
Organization: Zippo
Lines: 17
Sender: [e-mail]
Message-ID: <5751qm$[e-mail]>
NNTP-Posting-Host: interlock.randomhouse.com


I'd like to learn how to design RF tx/rx devices. I have built some "single
chip" trans/recv pairs and I have a Digital Eng. Degree. And have done some
analog work, but I know little of RF Design. And would like to know of books
(ISBN# if you have them) or WWW sites or whatever info that anyone could
pass on. Right now it'd like to build a phone mode FM crystal transmitter
and receiver since they seem to the most simple. And mabye later try doing
adding a VCO. I just want to start out simple so I can grasp the calculations
and design technique crystal based seem to be a good place to start. Also
I have seen the ARRL Radio Designer 1.5 does anyone know anything about it?
Can it teach me RF design or doest it assume you know RF and act more as
a tool? And any other notes/opinions good or bad about the ARRL Radio
Designer?

Thanks,
  Mike W - KC5B0D
  [e-mail]


From [e-mail] Mon Nov 25 19:07:40 1996
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From: "Joseph M. Zawodny" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Source for Siemens parts (BAT14-099)
Date: Fri, 22 Nov 1996 15:31:38 -0500
Organization: ARB NASA LaRC
Lines: 13
Message-ID: <[e-mail]>
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Hi,

        I need to find a place that sells Siemens components.
Specifically, I looking for the BAT14-099 dual Schottky diode.
Please reply to [e-mail].

        Thanks & 73
                KO4LW
--
Work: Dr. Joseph M. Zawodny                     Play: Joe Zawodny
      NASA Langley Research Center                    [e-mail]
      E-mail: [e-mail]               [e-mail]
      [phone]  [phone] FAX


From [e-mail] Mon Nov 25 19:07:41 1996
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From: "Roy C. Pollitt" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Hombrew Magazine
Date: Fri, 22 Nov 1996 15:49:22 -0500
Organization: DelMarVa OnLine!
Lines: 4
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Does anyone subscribe to Homebrew ???
Would appreciate your opinion of it ... I have never seen a copy.

Roy  KD4HC


From [e-mail] Mon Nov 25 19:07:42 1996
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From: [e-mail] (Bruce KD1MW )
Newsgroups: rec.radio.amateur.homebrew
Subject: High Voltage Diodes For Sale
Date: 22 Nov 1996 21:39:13 GMT
Organization: The Internet Connection
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: pmfr3ip25

Several solid state High Voltage Diode blocks. 2.625"x 2.625"x .625"
60KV @.1 amp, UNITRODE 86-526.  Also 45KV @.3 amp UNITRODE 86-525.
$10 ea. Shipped to lower 48.
Thanks for interest.  Bruce, KD1MW.


From [e-mail] Mon Nov 25 19:07:43 1996
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From: [e-mail] (Tom Hammond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: gluing to teflon
Date: Fri, 22 Nov 1996 21:52:37 GMT
Organization: SOCKET Internet Services INN Site
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Message-ID: <[e-mail]>
References: <56tv84$[e-mail]>
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X-Newsreader: Forte Free Agent 1.1/16.230

On 20 Nov 1996 03:51:32 GMT, "K.R.Burtchaell" <[e-mail]> wrote:

>I am looking for an adhesive to stick to teflon dielectric or a way to
>treat teflon dielectric to enable metal to be glued to it.Can anybody
>help?  73  Ken W6GHV

If you can rough up the surface of the teflon a bit, regular contact
cement can be made to work.  'Course, it all depends upon how tightly
you need the bond to be... it works in most cases, but might not hold
if a LOT of stress was placed on it.

73 - Tom Hammond   [e-mail]



From [e-mail] Mon Nov 25 19:07:44 1996
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From: [e-mail] (Tim Smith)
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Fri, 22 Nov 96 21:59:34 GMT
Organization: From the home front
Lines: 14
Message-ID: <575asp$[e-mail]>
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In article <[e-mail]>,
   [e-mail] (Dave Rickmers) wrote:

>You could use it to make difficult signals easier to copy, remove
>heterodynes, etc.  Like the Watkins-Johnson dsp only cheaper.
>dr
>


Can you tell me what the s/w is called and where I could d/l it?

Thanks,

Tim N1BTQ


From [e-mail] Mon Nov 25 19:07:45 1996
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From: Robert Nase Johnson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Loop antenna theory?
Date: Fri, 22 Nov 1996 14:10:48 -0800
Organization: AT&T WorldNet Services
Lines: 6
Message-ID: <[e-mail]>
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Hello -- I'm designing a VLF loop antenna and have read that the
sensitvity of such an antenna is affected both by number of turns and
area of the loop. My question is, if you can't have both, which is the
most important?
Thanks in advance
Rob Johnson


From [e-mail] Mon Nov 25 19:07:46 1996
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From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Followup-To: rec.radio.amateur.homebrew
Date: 22 Nov 1996 22:47:44 GMT
Organization: No media bias? They're calling 49 to 43 win a LANDSLIDE!
Lines: 34
Sender: [e-mail]
Message-ID: <575aig$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: primus.paranoia.com
Summary: excuse me

In Article <[e-mail]>, through puissant l
ocution, [e-mail] soliloquized:
>In article <[e-mail]>,
>[e-mail] (R. L. Measures ) writes:
>>Mr. Rauch appears not to have answered these seemingly-simple questions.
>>How can we go over theories point by point if one party is pointedly less
>>than forthcoming?
[zap]
>I am supposed to answer you and spend hours correcting nonsensical claim
>after nonsensical claim,  while you are free to avoid any question or spit
>out any response you choose. You, and in particular the magazine that gave
>you a platform to publish such obvious technical garbage, should be
>ashamed of what was done to people trying to learn. I think undoing the
>damage is impossible. More time arguing with you is simply wasted time.

Greetings. I would just like to interject here that as someone who
grew up after tubes "died" but is still MOST interested in these
discussions... I'm now totally confused and lost. On the bright
side, several explanations have been posted here that should have
been in the books I read... clear and simple enough to digest and
understand without a bottle of aspirin... While I REALLY want this
information to come out... I now have to ask myself, "Why pay
attention if it could be all wrong?"... Or, rather, who is right?

Heck, I'm so confused now that I don't even know which part you're
arguing about: the test results or the physics involved... or both.

Take care.

P.S. Feel free to ignore me... today is my "designated bad day" :-)
--
+-->Filip "I'll buy a vowel" Gieszczykiewicz | E-mail: [e-mail]
| http://www.paranoia.com/~filipg/ |SCI.ELECTRONICS.REPAIR FAQ + LOTS MORE!
| Enjoy your job, work within the law, make lots of money : Choose any two.
| I think for myself. I listen. I make decisions. I speak what I believe.


From [e-mail] Mon Nov 25 19:07:47 1996
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From: [e-mail] (Dave Rickmers)
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Fri, 22 Nov 1996 23:07:58 GMT
Organization: Earthlink Network, Inc.
Lines: 10
Message-ID: <[e-mail]>
References: <56bbbe$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <575asp$[e-mail]>
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[e-mail] (Tim Smith) wrote:


>Can you tell me what the s/w is called and where I could d/l it?
>
>> http://www.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
>> ftp://ftp.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip   1032518 byt
es
>>
>> sbfft11.zip     Sound Blaster spectral display and filtering
dr


From [e-mail] Mon Nov 25 19:07:49 1996
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From: "Tom C. Brown, Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 22 Nov 1996 17:11:45 -0600
Organization: Madison Materials Company
Lines: 25
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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To: Wes Stewart <[e-mail]>

Wes Stewart wrote:

[Partial]
>
> Don't you think it wise to consider the phase angle of these currents.  This

>ain't DC you know.  Furthermore, these aren't isolated components tested in a

>measurement system, they're embedded in a system that includes other
>reactances and frequency dependent source and load impedances.  So, their
>functional behavior is quite a bit more complicated that this "Ohm's law"
>analysis.

Hi Wes-

Are you saying that Tom was making a hasty (and incorrect) assumption
when he said that he majority of any VHF current would go through the
resistor rather than the suppressor coil?  If that's what you are
saying, then I agree.  If not, then please explain how the difference in
phase angle between the reactive path and the resistive path (the
parallel resistor and inductor in the suppressor) would force the VHF
current to flow through the higher impedance path rather than the lower.

I think I must be missing something.......  (of course, it wouldn't be
the first time THAT happened! <g>)

73, Tom KJ5IE


From [e-mail] Mon Nov 25 19:07:50 1996
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From: "Fabrice Segura" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ALAN CT145 ??
Date: 22 Nov 1996 23:57:25 GMT
Organization: France Telecom Interactive
Lines: 5
Message-ID: <01bbd737$d93dcde0$[e-mail]>
NNTP-Posting-Host: yellow-bes-102.wanadoo.fr
X-Newsreader: Microsoft Internet News 4.70.1155

I'm a French Station,
Do you have informations about Alan CT145 ???

  Thanks
  Fabrice


From [e-mail] Mon Nov 25 19:07:50 1996
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From: [e-mail] (Ken Madsen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need trc 485  mod info
Date: 23 Nov 1996 00:55:36 GMT
Organization: Island Internet Customer
Lines: 4
Message-ID: <575i28$[e-mail]>
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Does any body have any info on the new TRC 485 sideband radio ,channels and
clarifire unlocking , genral tune up.

Thanks


From [e-mail] Mon Nov 25 19:07:51 1996
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From: [e-mail] (Ken Madsen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for mods  Cobra 132 XLR
Date: 23 Nov 1996 00:58:29 GMT
Organization: Island Internet Customer
Lines: 2
Message-ID: <575i7l$[e-mail]>
NNTP-Posting-Host: slip17.qb.island.net
To: All
X-Newsreader: News Xpress Version 1.0 Beta #3

Does anyone have any mods for the Cobra 132 XLR Channels and genral tune up.
Thanks...


From [e-mail] Mon Nov 25 19:07:52 1996
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From: [e-mail] (jdflex)
Newsgroups: rec.radio.amateur.homebrew
Subject: MW DX Loop Antenna Construction
Date: 23 Nov 1996 01:04:10 GMT
Organization: TECLink Internet Services: [e-mail]
Lines: 4
Message-ID: <575iia$[e-mail]>
NNTP-Posting-Host: br1_3.teclink.net
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     I want to build and indoor loop antenna for DXing the broadcast
band. I need some plans and skematics to go by. Anybody got any ideas?
     Send e-mail to [e-mail]



From [e-mail] Mon Nov 25 19:07:53 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: LCD 4x20 char. displays for sale ....cheap
Date: 23 Nov 1996 01:40:23 GMT
Organization: AOL http://www.aol.com
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

I am selling new 4x20 character displays for $8.95 each.  They use the
hitachi standard, just like an Optrex display.  They have a 14 pin
interface.  Great for projects!  If you are interested please E-mail me
privately.

Thanks in advance,
Walt


From [e-mail] Mon Nov 25 19:07:54 1996
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From: [e-mail] (Brian Bennett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8 Hz lightning receiver ????
Date: Sat, 23 Nov 1996 03:05:12 GMT
Organization: Not very organized
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
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On Thu, 21 Nov 1996 18:03:14 GMT, [e-mail] (Bart Mudde)
wrote:

>Hello OM, who knows something about a receiver for lightning ?

We did a project in school for "sferics"(atmospheric disturbances?)
and we used homebuilt VLF receivers with really long wire antennas &
recorded lightning strikes halfway around the world.( I was told)
So you might want to look around for VLF receiver projects!!

Best of luck!!

Brian VE7IJQ


From [e-mail] Mon Nov 25 19:07:55 1996
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From: [e-mail]@smtp-news2.ibm.net
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is it possible to modify VCR "Rabbits" for ATV use?
Date: 23 Nov 1996 03:32:43 GMT
Lines: 42
Message-ID: <575r8r$1rh6$[e-mail]>
References: <01bbd4fe$ad9c3d60$bd72adce@default>
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X-Newsreader: IBM NewsReader/2 2.0

In <01bbd4fe$ad9c3d60$bd72adce@default>, "Jon Arndt (N0SGM)" <holmes@concentri
c.net> writes:
>This is a multi-part message in MIME format.
>
>------=_NextPart_000_01BBD4BB.9F78FD60
>Content-Type: text/plain; charset=ISO-8859-1
>Content-Transfer-Encoding: 7bit
>
>1. Is it possible to modify an ordinary "Rabbit" for ATV use?
>2. Can the receiver module be modified to tune across the entire 902 Mhz
>band?
>3. Can the transmit module be modified to xmit in the 1200Mhz band by
>multiplying the IF differently?
>4. If the above is possible can the receive module be modified to tune the
>1200 Mhz band?
>
>Any suggestions would be appreciated.
>
>Jon Arndt ( N0SGM )
>
>
>------=_NextPart_000_01BBD4BB.9F78FD60
>Content-Type: text/html; charset=ISO-8859-1
>Content-Transfer-Encoding: quoted-printable
>
><html><head></head><BODY bgcolor=3D"#FFFFFF"><p><font size=3D2 =
>color=3D"#000000" face=3D"Arial">1. Is it possible to modify an ordinary =
>"Rabbit" for ATV use?<br>2. Can the receiver module be =
>modified to tune across the entire 902 Mhz band?<br>3. Can the transmit =
>module be modified to xmit in the 1200Mhz band by multiplying the IF =
>differently?  <br>4. If the above is possible can the receive =
>module be modified to tune the 1200 Mhz band?<br><br>Any suggestions =
>would be appreciated.<br><br>Jon Arndt ( N0SGM )<br><br><br></p>
></font></body></html>
>------=_NextPart_000_01BBD4BB.9F78FD60--
>
 Jon,
 If anybody could answer or show you the way, probably one of the guys in the
 Fort Wayne Radio Club W9TE could. They had the first ATV repeater in the US
 on the air. Try Cliff N9MKB, I don't know if any of that crew gets on the Int
ernet,
 but there are quite a few packeteers in the Fort Wayne area.

                                                              Jim WD9AHF


From [e-mail] Mon Nov 25 19:07:56 1996
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From: [e-mail] (Dayglo)
Newsgroups: sci.geo.satellite-nav,rec.radio.amateur.homebrew
Subject: Re: home-brew DGPS receiver
Date: 23 Nov 1996 03:42:47 GMT
Organization: No Known Organization
Lines: 22
Message-ID: <575rrn$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dialin43.annex4.radix.net
X-Newsreader: WinVN 0.99.6
Xref: news1.epix.net sci.geo.satellite-nav:29584 rec.radio.amateur.homebrew:21314

>I am looking for an alternative to the commercial ~$450 DGPS receivers.
>Does anyone have information to build a home-brew DGPS receiver to make
>use of the 250 - 350 KHz marine radio DGPS beacons in the US and Canada?
>Please email to [e-mail].

I believe that what you are looking for is called SkipperChip.  It is an OEM
product manufactured by a company called pacific Crest Corporation.  I do not
really have much information on this other than they are taking orders now but

are not shipping till sometime in early 97.

Pacific Crest Corporation
990 Richard Ave. Suite 110
Santa Clars CA 95050
[phone]
[phone]
[phone] Fax
[e-mail]

If anyone receives any further information could they please post it in the
group or pass it along to me [e-mail].




From [e-mail] Mon Nov 25 19:07:57 1996
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From: David Bindle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Help to Find
Date: Fri, 22 Nov 1996 22:58:46 -0600
Organization: University of Saskatchewan
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: duke.usask.ca
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII




I need to help to locate suppliers for the following components:

11C90 prescaler that divides by 10 (Plessey?)
95H90 divide by 10 Fairchild decade counter
MAR6 mmic (used to be handled by Mini-Circuits)

any help would sure move my project along, even someone with a good junk
box.
 Contact Ken/ VE5KRB on this news group or    [e-mail]
73's and TNX




From [e-mail] Mon Nov 25 19:07:58 1996
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From: Brian Kline <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transformer For Power Supply
Date: Fri, 22 Nov 1996 23:26:49 -0800
Organization: Hybrid Networks, Inc.
Lines: 42
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: kline-pc.hybrid.com
Mime-Version: 1.0
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Dave Morrow wrote:
>
> I'm trying to build a 13.8v 20amp power supply and I'm having difficulty
> locating a transformer. This project may be more difficult than I
> thought. I'm looking for a 120v primary and 20v - 25v 10amp secondary or
> something close. Of the places I've called they don't carry it or they
> want $200.00 for it.
>
> Any words of advise? Any ideas as to where to find a transformer at a
> cut rate price?
>
> Help!!
> Thanks, Dave


One approach you might try is to convert a 40A 5V linear supply to
13.8V. The basic approach is to rewire the transformer connections from
full wave rectifier using a center tapped transformer, to a full wave
bridge rectifier. This provides approximately 16V DC for the input to
the pass transistors. You then change the feedback voltage divider so
13.8V is divided down to the reference voltage. Finally replace all of
the electrolytic capacitors with higher voltage ones and lower
capacitance.
This generally results in a power supply whose pass bank has adequate
power dissipation capabilities and can handle 2X the operating current.
There may be some more details that I have forgotten but this should
give you the basic idea. The ones that I have converted so far have
started out as 10A 5V supplies. I generally start out by drawing up the
original schematic for the original supply and then working out the
modifications.
In this area used 5V supplies can frequently be found dirt cheap.
The principal disadvantage of this approach is the wasted .6V drop in
the additional diodes required for a bridge rectifier (12W at 20A)

Transformers that were intended for 5V linear supplies are frequently
available from mail order surplus dealers such as Alltronics in San
Jose CA and others for much more reasonable prices than you have found.

I hope this helps.

Brian Kline WA6QDP
[e-mail]


From [e-mail] Mon Nov 25 19:07:59 1996
Message-ID: <[e-mail]>
Date: Fri, 22 Nov 1996 23:30:32 -0800
From: Randy Jones <[e-mail]>
X-Mailer: Mozilla 2.01 (Win16; I)
MIME-Version: 1.0
CC: [e-mail]
Subject: Re: Want Kenwood IF-10D Computer Interface.
References: <56l7cr$[e-mail]> <56na4m$[e-mail]> <[e-mail]>
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William Vynck wrote:
>
> MICHAEL J DRUM wrote:
> >
> > Greetings,
> >
> > I want to buy a Kenwood IF-10D Computer interface for my TS-60. If you
> > have one for sale please contact me at my Email address and let me know
> > the details. I will answer all reply's sent.
> >
> > Thank You.
> >
> > Mike>
>
> DONT BUY !!
>
> To expencive, i could send you the chematics to build one.
>
> 73
> William

Build, ha! Many of us "appliance operators" are either too busy to build
or don't know one end of a soldering iron from the other.

Besides, OEM equipment always looks so much nicer.

Radio Randy.


From [e-mail] Mon Nov 25 19:08:00 1996
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From: John Rabson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Valves for 50 MHz
Date: Sat, 23 Nov 1996 08:44:43 GMT
Lines: 5
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: central.zetnet.co.uk
X-Mailer: ZIMACS Version 1.09x 10000842

According to an ancient WW valve data book an 807 will deliver 40W at
up to 60 MHz.

73 de G3PAI



From [e-mail] Mon Nov 25 19:08:01 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: ** RF Transmitter Design
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <5751qm$[e-mail]>
Date: Sat, 23 Nov 1996 11:26:26 GMT
Lines: 36

In article <5751qm$[e-mail]> [e-mail] writes:
>
>I'd like to learn how to design RF tx/rx devices. I have built some "single
>chip" trans/recv pairs and I have a Digital Eng. Degree. And have done some
>analog work, but I know little of RF Design. And would like to know of books
>(ISBN# if you have them) or WWW sites or whatever info that anyone could
>pass on. Right now it'd like to build a phone mode FM crystal transmitter
>and receiver since they seem to the most simple. And mabye later try doing
>adding a VCO. I just want to start out simple so I can grasp the calculations
>and design technique crystal based seem to be a good place to start. Also
>I have seen the ARRL Radio Designer 1.5 does anyone know anything about it?
>Can it teach me RF design or doest it assume you know RF and act more as
>a tool? And any other notes/opinions good or bad about the ARRL Radio
>Designer?

Radio Designer won't teach you to design radios, but it is a useful
tool. It is limited, however, to linear small signal analysis, so
it won't directly simulate the behavior of oscillators or Class C
amplifiers. You can use it to model the passive LC networks used
in such circuits. PSpice is better if you need to model non-linear
behavior.

Two useful books are:

RF Circuit Design by Chris Bowick
(ISBN 0-672-21868-2)

Introduction to Radio Frequency Design by Wes Hayward
(ISBN 0-87259-492-0)

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Nov 25 19:08:02 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!cs.utexas.edu!howland.erols.net!dciteleport.com!phase2.worldnet.att.net!netnews.worldnet.att.net!newsadm
From: woody white <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CHIMNEY FOR 4CX-10,000
Date: Sat, 23 Nov 1996 03:59:43 -0800
Organization: http://www.geocities.com/capecanaveral/3722
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 207.146.142.187
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.01E (Win16; I)

Try checking with a scientific supply house (like Cole-Parmer) for a
short teflon beaker of the proper diameter. Cut the chimney frome it...
Woody

Arthur Garabedian wrote:
>
> I am looking for a chimney or phenolic material to make one for a
> 4CX-10,000 tube transmitter. Tube needs to be about 6" dia. 2" long.
> Thanks,  ARTHUR  KC6KUK  ANAHEIM,  CA. . . .

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Mon Nov 25 19:08:02 1996
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From: Dave Riley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: LOWFER ACTIVITY NEW ENGLAND ??
Date: Sat, 23 Nov 1996 08:07:33 -0500
Organization: Broadcast Technical Services
Lines: 8
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: hingham42.pcix.com
Mime-Version: 1.0
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Gudday Fellow Gadget Makers..

Am looking for ANY interest in New England area on LowFer Band
activity.. A dozen years ago there were several beacons and
QSO's on 160-190 khz daily.. Now NIL...  Have homebrew Pfet
with CCW - BPSK - Coherent etc..    Anyone around??
73
Dave Riley  -  AA1A  -  Marshfield, Ma.


From [e-mail] Mon Nov 25 19:08:03 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!news.idt.net!nntp.farm.idt.net!news
From: Dave Riley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: roller inductor where ?
Date: Sat, 23 Nov 1996 08:12:34 -0500
Organization: Broadcast Technical Services
Lines: 26
Message-ID: <[e-mail]>
References: <56qeie$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: hingham42.pcix.com
Mime-Version: 1.0
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X-Mailer: Mozilla 3.0Gold (Win16; U)

TIEMANN BRUCE wrote:
>
> In article <[e-mail]>,
> R. L. Measures  <[e-mail]> wrote:
>
> > Be sure to short the unused turns,
> >
>
> Many articles using air-wound coils direct one to short unused turns,
> and you do too.  I see how the voltage would be high at the end, like a
> Tesla coil, but it seems like it would also lower the Q, possibly a lot.
> Shorting unused turns on an inductor-with-a-core amounts to having a
> transformer with a shorted secondary - which is no good!  What
> are the pros of shorting turns?  (And how much does it lower Q?)
>
> Bruce
> N6URH

de Dave AA1A,
Shorted turns changes Q of network and wastes POWER..  If you are
running 50KW and think the autotransformer effect will cause
high enough voltages at the unshorted ends then by all means
short them out..  If not then don't waste power.. If you read
the difference with a bridge, you will probably come to above
conclusion.
[e-mail]--------


From [e-mail] Mon Nov 25 19:08:04 1996
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From: Dave Riley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Loop antenna theory?
Date: Sat, 23 Nov 1996 08:16:51 -0500
Organization: Broadcast Technical Services
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
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Robert Nase Johnson wrote:
>
> Hello -- I'm designing a VLF loop antenna and have read that the
> sensitvity of such an antenna is affected both by number of turns and
> area of the loop. My question is, if you can't have both, which is the
> most important?
> Thanks in advance
> Rob Johnson

Gudday Rob,
I found that the most real estate within the loop gets the most sigs
out.. Loops are nice especially near noise.. But E-Probes or
(active antenna) sure out performs them here and also broadband
enough to cover from Omega to 500 khz..
Try Long Wave Club of America  'LWCA' on your browser..  73 Dave - AA1A


From [e-mail] Mon Nov 25 19:08:05 1996
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From: "A Redshirt" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematic Drawing Software For Ham Use?
Date: 23 Nov 1996 13:52:15 GMT
Organization: "Credo Quia Absudum" -- E Clampus Vitus
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Hello.

Any suggestions on what is available/where to find a software
package that I can use to replace the endless drawings I have
"created"  on the back side of Safeway market bags et al over
the years?

I do not need the functionality of transferring the drawings to
four-sided PC board layouts, or anything as fancy as that;
I'm just looking for a way to clean up and file a lot of loose
sketches, and document some of junk I have "invented" (?!)
over the last thirty years or so.

I assume that the library of "gadgets" or "elements" would
be of some importance also.  And I can relate to the terms
such as Condenser and Kilocycle.

I'd appreciate your comments...

Thanks

de John
A Redshirt in Rocklin
"HILLARY SHOT VINCE!!"
--



From [e-mail] Mon Nov 25 19:08:06 1996
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From: [e-mail] (Jim Potter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: rf grounding
Date: Sat, 23 Nov 1996 14:22:26 GMT
Organization: The Santa Fe Institute
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[e-mail] wrote:

>In article <[e-mail]>,
>[e-mail] writes:
>
>>TVI could be one
>>of the more benign side effects  !!!
>
>What would a less benign effect be?
>

Burned lips.


James M. Potter, President              TEL: [phone]
JP Accelerator Works, Inc.              FAX: [phone]
2245 47th Street                        EMAIL: [e-mail]
Los Alamos, NM 87544-1604               URL: http://www.jpaw.com



From [e-mail] Mon Nov 25 19:08:07 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 23 Nov 1996 14:46:39 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 43
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In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>Perhaps not.  Mr Rauch indicated that he "will be off-net for two or
three
>days."---or this debate may be near its end.   However, in either case,
an
>epilogue might be appropriate---provided that anyone is interested in the

<SNIP>

>  I would think that one of our "recognized amplifier experts" would have
>taken the minute or so necessary to calculate the current distribution.
If
>Tom Rauch had spent spent such a minute six years ago, he would have
saved
>himself, QST, and yours truly much unpleasantness.

Hi Rich,

Doesn't that current distribution indicate the Q is unity?? If I have a Q
of unity, how much lower can I make it? What is the RF resistance of the
thing nichrome wires, and what is the goal IN THE CIRCUIT?

Dick Ehrhorn owes me one. Last year Dick was the technical idiot
conspiring against you. This year it is me.

From Warren Bruene of Collins radio fame to Buzz Miklos of Siemens,  from
Chazen and Brandon of Eimac to Orr, everyone disagrees with Rich Measures
just because they WANT to sell people bad ideas.

Harris, Rockwell, Siemens, GE, ETO, Ten Tec, Heathkit, Drake, Sanders,
RCA, Ameritron, and all the other manufacturers aren't as knowlegeable as
Rich. Who says this??? Rich.

Companies like those, and dozens of people who contacted QST to point out
the errors in your articles, must just avoid your suggestions because they
just don't understand theory or physics as well as Rich.

Discussing circuit theory or physics is a waste of time, because even
textbooks are part of the anti-Rich conspiracy.

73, Tom


From [e-mail] Mon Nov 25 19:08:08 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Loop antenna theory?
Date: 23 Nov 1996 14:46:40 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
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References: <[e-mail]>
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In article <[e-mail]>, Robert Nase Johnson
<[e-mail]> writes:

>
>Hello -- I'm designing a VLF loop antenna and have read that the
>sensitvity of such an antenna is affected both by number of turns and
>area of the loop. My question is, if you can't have both, which is the
>most important?
>Thanks in advance
>Rob Johnson

Area Rob. Always the area.

73 Tom


From [e-mail] Mon Nov 25 19:08:09 1996
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From: David Cooley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Specs 4-1000
Date: Sat, 23 Nov 1996 10:28:10 -0500
Organization: IPass.net
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]>
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To: Sonja og Petter Brevik <[e-mail]>

Sonja og Petter Brevik wrote:
>
> I am planning to build a new PA, using the 4-1000 tube. Does anybody
> have more complete specs than the summary found in the handbooks?

I have the specs for the pulse rated 4-1000A, numbered as 4PR1000A
What data exactly do you need?
You can call CPI (Eimac/Varians power tube division) at [phone]
and they will fax or send a complete data sheet with conductance curves
etc.

Take care,
Dave


--
=================================================================
David Cooley           A.K.A. N5XMT            [e-mail]
http://www.ipass.net/~cooldave/
=================================================================


From [e-mail] Mon Nov 25 19:08:10 1996
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From: "Dane Robinson" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Specs 4-1000
Date: 23 Nov 1996 15:29:14 GMT
Organization: Broadcast Services
Lines: 21
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Sonja og Petter Brevik <[e-mail]> wrote in article
<[e-mail]>...
> I am planning to build a new PA, using the 4-1000 tube. Does anybody
> have more complete specs than the summary found in the handbooks?
>
> 73,
> Petter
> --
> ---->   LA7YG
>       Petter Brevik
>       ╪stliveien 15           Tel [phone]
>       1482 Nittedal           Fax [phone]
>

        Eimac will send you a tube data sheet with complete specs and probably a
handful of
articles using 4-1000 tubes in amplifiers for free what could be better
than that? If you need
EIMAC's number or address let me know  KC5OPD @JUNO.COM


From [e-mail] Mon Nov 25 19:08:11 1996
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From: David Cooley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 900Mhz amp
Date: Sat, 23 Nov 1996 10:30:26 -0500
Organization: IPass.net
Lines: 12
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If anyone is interested, Motorola has released a new 870-950 Mhz amp
module, 300mW in, 18W out, runs off 12.5 volts.  P.N. MHW2821-002.
They retail for $43.00 each in qty's of 10.

Later,
Dave

--
=================================================================
David Cooley           A.K.A. N5XMT            [e-mail]
http://www.ipass.net/~cooldave/
=================================================================


From [e-mail] Mon Nov 25 19:08:11 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transformer For Power Supply
Date: 23 Nov 1996 15:38:23 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
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In article <[e-mail]>, [e-mail] writes:

>I'm looking for a 120v primary and 20v - 25v 10amp secondary or
>> something close.
Hi

A 20 amp 13.8 volts power supply only costs about $100.

You should use 20 volts for the supply if you can get one. The more
voltage
you drop increases the heatsink area needed. In your design you will need
more than a 20 amp transformer unless you never intend to draw 20 amps.
Rate the transformer at 20 amps while producing 20 volts. This is overkill
but
keeps you in a safe area.

Carl
The2x4


From [e-mail] Mon Nov 25 19:08:12 1996
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From: Steve C <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Band pass filter for 144MHz reqd?
Date: Sat, 23 Nov 1996 17:00:24 +0000
Organization: Moi
Lines: 27
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Hi,

I want a low (nil) loss on passband, and good loss out of band, filter
for 2m (144-145 will do)

I'd like it to be capable of passing full TX power (400W PEP), but at
least 50W PEP if not.

WHat design do I ned to use ?

Will a cavity have a wide enough passband, and a low insertion loss (AND
be flat in the passband)

Or am I looking at an interdigital rod type ?

I have the facililty to tune the passband response to make it flat etc,
ie any insertion loss tests, and can sometimes do return loss tests
(VSWR)

Lastly, I need to be able to make it fairly cheaply as its for an
experiment.

Any ideas ??

CUL
--
Steve C


From [e-mail] Mon Nov 25 19:08:13 1996
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From: Rod Fitz-Randolph <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: RELCOM M6D MIXERS??
Date: Sat, 23 Nov 1996 20:10:01 +0000
Lines: 4
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Does anyone have any information on the Watkins-Johnson/Relcom
M6D Balanced Mixers and the H5A units?  I need spec sheets or
something that shows the frequencies, connections of pins, etc.
Thank you for responding!  Rod, W5HVV


From [e-mail] Mon Nov 25 19:08:14 1996
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From: Rod Fitz-Randolph <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NE602AN Circuits
Date: Sat, 23 Nov 1996 20:13:37 +0000
Lines: 3
Message-ID: <[e-mail]>
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Does anyone have any circuit diagrams for the
NE602AN?  Could you please tell me a source for
good circuits using this device?  Thank you.  Rod, W5HVV


From [e-mail] Mon Nov 25 19:08:15 1996
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From: woody white <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transformer For Power Supply
Date: Sat, 23 Nov 1996 13:03:41 -0800
Organization: http://www.geocities.com/capecanaveral/3722
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A possible source...  Such a transformer may be located in an old (toasted oth
er
than xfmr) high power audio amp.  Get to know local service centers dumpsters!

Beware of one thing - Many *large* stores have ther POLICIES and won't let you

have or even buy unclaimed/defective gear.  For example, I was looking for a T
V
camera for ATV and went by MWard.  Service had a kilobuk camcorder with a
trashed tape basket/drive - I just wanted it for the "real time" video, but th
ey
acted a bit paranoid (wonder if they thought I was undercover "scrap police")
and would not give or sell it to me.  Had to destroy it, they said.  A friend
in
the business for himself fiannly came across one.  Good Luk!   Woody


> > I'm trying to build a 13.8v 20amp power supply and I'm having difficulty
> > locating a transformer. This project may be more difficult than I
> > thought. I'm looking for a 120v primary and 20v - 25v 10amp secondary or
> > something close. --
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722
.


From [e-mail] Mon Nov 25 19:08:16 1996
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From: pbunn624 (Pat  Bunn)
Newsgroups: rec.radio.amateur.homebrew
Subject: ONE'r Transmitter Kits
Date: 23 Nov 1996 21:32:33 GMT
Organization: STF Electronics
Lines: 11
Message-ID: <577qhh$[e-mail]>
NNTP-Posting-Host: dp25.teleplex.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
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I have several Dozen One'r QRP transmitter kits complete with step by
step instructions. Available on the following frequencies:

7.040, 7.110, 10.106, 14.060 Mhz   All kits include crystals

$10 each plus $2 postage    10 Kits $95 postpaid

Pat Bunn
624 Kits
171 Springlake Drive



From [e-mail] Mon Nov 25 19:08:18 1996
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From: [e-mail] (Terry Simonds)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: rf grounding
Date: Sat, 23 Nov 1996 21:58:02 GMT
Organization: Icanect
Lines: 35
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[e-mail] (morethanone kalar) wrote:

->> Queston:  Can anyone explain what the "ideal" grounding situation
is for a
->> ham
->> station. My shack is in a basement area. The tvi on cable is quite
severe.
->>
->> The antenna is a GAP vertical only 10 feet from the house. On 40
meters,
->> when the amp is on (1 kw) it triggers a relay switch for the
doorbell
->> (also located in the basement shack area).


I managed to get a good RF ground in a basement shack by drilling a
hole right through the concrete floor under the bench. Drill at an
angle so when you drive the rod it will clear the bench! I used two
8-ft power-company rods. Use one threaded connector as a sacrificial
"hammering surface" and drive the first rod until the mushroomed-out
connector is about floor level. Take it off, thread on the other and
tighten the two rods together (use a pipe wrench!). Put the mushroom
on the second rod and drive it in. Take off the mushroom (save
it...Uou never know when...).

This way you can hook a very short piece of braid between the TX and
mutha earth.

However, I suspect that your vertical so close to the house, and your
running a gallon, is the major source of the problem!


73--Terry/WB4FXD in Ft. Lauderdale, FL
[e-mail]



From [e-mail] Mon Nov 25 19:08:20 1996
From: [e-mail] (Don Phelps)
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsfeed.internetmci.com!miwok!infoway!don.phelps
Newsgroups: rec.radio.amateur.homebrew
Subject: TVI & RF Grounding
Message-ID: <[e-mail]>
Date: Sat, 23 Nov 1996 22:27:01 GMT
Distribution: world
Organization: The Infoway BBS [phone] 28,800 8-N-1
Lines: 40

 Rick,

 Seems to me that you could run a separate circuit of 230 and 115
 for your station, and use TVI bypass capacitors on that circuit
 in addition to the circuit for the TV and doorchime.

 Then you could put a high pass filter on the cable TV, they are cheap.
You could also wrap the cable coax for a few turns through a
ferrite core.

Hopefully you have some sort of antenna tuner with good Q
feeding your antenna, and/or have a low pass filter.

Now about your question about your RF ground, I donn't think you
want to use anything that runs back into the house.
Combination of ground rod and ground radial wires under the vertical..

Before you do much work on that vertical, why don't you build
a reference dipole for 40 meters.  Then compare the TVI between
the dipole and the vertical.

That should get you some improvement and better information,
without wasting any money, but only getting things every ham
would like to have.

I have operated a vertical on 40 meters about 10 feet away from
a TV with rabit ears, and curred all the TVI with the above steps
with 100 watts PEP.

Don,
N6MCE

 K1> Queston:  Can anyone explain what the "ideal" grounding situation is
 K1> for a ham
 K1> station. My shack is in a basement area. The tvi on cable is quite
 K1> severe.


... [e-mail]  1:125/104 POBox 9739 San Rafael,CA 94912
___ Blue Wave/386 v2.30 [NR]


From [e-mail] Mon Nov 25 19:08:22 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematic Drawing Software For Ham Use?
Date: 23 Nov 1996 22:56:30 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 45
Message-ID: <[e-mail]>
References: <01bbd944$0ba84040$[e-mail]>
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X-Newsreader: AOL Offline Reader

In article <01bbd944$0ba84040$[e-mail]>, "A Redshirt"
<[e-mail]> writes:

>Hello.
>
>Any suggestions on what is available/where to find a software
>package that I can use to replace the endless drawings I have
>"created"  on the back side of Safeway market bags et al over
>the years?
>
>I do not need the functionality of transferring the drawings to
>four-sided PC board layouts, or anything as fancy as that;
>I'm just looking for a way to clean up and file a lot of loose
>sketches, and document some of junk I have "invented" (?!)
>over the last thirty years or so.
>
>I assume that the library of "gadgets" or "elements" would
>be of some importance also.  And I can relate to the terms
>such as Condenser and Kilocycle.
>
>I'd appreciate your comments...
>
>Thanks
>
>de John
>A Redshirt in Rocklin
>"HILLARY SHOT VINCE!!"
>--
>
>Go to the nearest NTE distributor, and get a copy of IVEX
WinDraft.  It is a schematic export program, designed to be
used with WinBoard.  I have been using WinDraft for about 7
months to do my schematic drawings, including some for
publication in various magazines.  You can also download
the WinDraft program direct from the IVEX BBS (forgot the
address;  might be IVEX.com...)  The NTE packaged version
is registered, and will give you about 220 pins.  The shareware
version is limited to 100 pins.  Cost is 29.95.  Comes with
pretty decent libraries, and you can create your own parts as
needed.

Pete
 >




From [e-mail] Mon Nov 25 19:08:23 1996
Newsgroups: misc.industry.electronics.marketplace,alt.comp.hardware.homebuilt,comp.robotics.misc,sci.electronics.design,sci.electronics.equipment,sci.electronics.misc,sci.electronics.basics,rec.radio.amateur.homebrew
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From: [e-mail] (ITU Technologies)
Subject: Get PIC'n Holiday Special until 12/31/96!
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                      See our web page for more details
                            http://www.itutech.com


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microcontrollers then now is the time!  Our SPECIAL HOLIDAY packages
are the perfect way to GET PIC'n!  We've bundled our popular
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only $39!

Please see our web page for more product information,
http://www.itutech.com


                  *SPECIAL EXPIRES 12/31/96, SO ORDER TODAY!*


ORDERING INFO
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checks and money orders, or COD orders (add $5).  Please add $5
shipping
inside the US, $10 for airmail shipping outside the US.  All products
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You may order via phone, fax, mail or on-line using our new SSL SECURE
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ITU Technologies
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Phone: [phone]
FAX: [phone]
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From [e-mail] Mon Nov 25 19:08:24 1996
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From: [e-mail] (Paul Mooney)
Newsgroups: rec.radio.amateur.homebrew
Subject: QST auto ATU (Jan '96)
Date: Sat, 23 Nov 1996 23:37:54 GMT
Organization: ONYX Internet
Lines: 10
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In the January 1996 issue of QST an automatic ATU (the AT-11) is
described.

Has anybody built this, and if yes, how satisfied with it are you?

Thanks in advance,

Paul
G7SPV



From [e-mail] Mon Nov 25 19:08:25 1996
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From: Dan Bryden <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Homebrew amp
Date: Sat, 23 Nov 1996 17:21:28 -0800
Organization: Delta Internet Services, Anaheim, CA
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I'm looking for an amplifier using a 3-1000 or pair of 3-500 or
something equal for HF. Maybe a partially completed amp or one that
needs work. Let me know what you have. Dan WA6PXO


From [e-mail] Mon Nov 25 19:08:27 1996
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From: jreimer <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: AM detector using PLL
Date: 24 Nov 1996 02:18:55 GMT
Lines: 31
Message-ID: <578baf$[e-mail]>
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>Why do this?  (1) Better linearity than a diode.  (2) It largely
>counteracts "selective fading."  Selective fading, as I understand it,
>is what happens when the signal is momentarily added to a slightly
>Doppler-shifted copy of itself (reflected off a moving layer of
>the ionosphere).  (Or maybe phase-shifted is enough; this isn't fresh
>in my mind.)  That's what makes the shortwave radio go mushy for a
>few seconds every now and then.  But if the PLL is well designed,
>it won't change phase very fast; it will stay in phase with the
>original carrier and the sound will be much better.





There's another good reason to do it.  Analog multiplying is the same as
nonlinear mixing or heterodyning.  When the PLL is in phase with the
carrier and is heterodyned with it, the upper and lower sidebands combine
in phase.  Because any noise associated with the signal has random phase,
it tends to cancel a little, providing better signal to noise over an
envelope detector.

jreimer










From [e-mail] Mon Nov 25 19:08:27 1996
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From: [e-mail] (Ken Lopez)
Newsgroups: rec.radio.amateur.homebrew
Subject: <no subject>
Date: 24 Nov 96 04:22:52 GMT
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Reply-To: [e-mail]
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Originator: [e-mail]

unsubscribe [e-mail]


From [e-mail] Mon Nov 25 19:08:28 1996
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From: Ricky L. Ponder
Newsgroups: rec.radio.amateur.homebrew
Subject: Want Plans for 10m or 6m Duplexers
Date: 23 Nov 1996 20:48:46 -0800
Organization: Zippo
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Hello, name here is Ricky. Does anyone out there have plans to
build Duplexers for 10 or 6 meters. I would like to put a
repeater together for either band and if I could build the
duplexers also it would sure keep the cost down. I've talked
on several 10m repeaters when the band was open that people
said were running homemade duplexers, but have never been able
to get any information on them. Any info. will be greatly
appreciated.

Ricky L. Ponder
[e-mail]
http://www.geocities.com/heartland/7680


From [e-mail] Mon Nov 25 19:08:29 1996
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From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: good source for amplifier tips (part 5)
Date: 24 Nov 1996 05:09:15 GMT
Organization: KN6DV
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For those who are interested, I have up load PART 5 to my  page  at:
http://www.av.qnet.com/~kn6dv
(so far I had many positive reaction and only 1 negative)
Thanks 73 Will,  KN6DV

REFORM
Unless the reformer can invent something which substisutes attractive
virtues for atractive vices, he will fail.
(Walter Lippmann)

[e-mail]



From [e-mail] Mon Nov 25 19:08:30 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: synchronous noise blanker
Date: Sat, 23 Nov 1996 22:38:38 -0700
Organization: Europa Communications Inc. [Portland, OR]
Lines: 12
Message-ID: <[e-mail]>
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XPident: Unknown

I once built one of these.  It used an op amp as zero-crossing detector
for AC line using ckt from Nat Semi Linear data book.  Then two LM555's.
First generated adjustable delay for controlling the second which
connected to HDR blanker gate out of U. Rohde book on receivers.

It worked beautifully on light dimmer source.

However, if you have interference from multiple light dimmers, some on
different AC phase, and others set for different dimming levels, you soon
need 5-10 different noise blankers.

I scrapped the idea, as you can imagine.


From [e-mail] Mon Nov 25 19:08:31 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NASA & The Right Thing
Date: 24 Nov 96 05:44:28 GMT
Organization: ucsd usenet gateway
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Rich recently posted the following:

>Big organizations don't always do the right thing, Tom.  NASA launched
>Shuttle Mission 25  even though NASA had videotapes of 10 previous
>missions
>where fire could be seen coming through the o-rings on the booster
>rockets,
>adjacent to the main hydrogen tank, no less.

This isn't radio, but I also don't think it's true.  I'm looking at a
chart from Richard Feynman's account of the Challenger investigation and
it shows only seven missions in which there was any O-ring incident and
17 in which there were none.  The 7 incidents involved erosion of the
O-ring, but not, so far as I know, fire shooting out the side of the
rocket.  Perhaps, a specific reference to Rich's source would be in
order.

                                                       Dave  KE9ED


                                                     Dave  KE9ED


From [e-mail] Mon Nov 25 19:08:32 1996
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From: [e-mail] (Robert Fowle)
Newsgroups: rec.radio.amateur.homebrew
Subject: improvements to my web page
Date: Sun, 24 Nov 1996 07:25:39 GMT
Organization: The HAMMARLUND Historian
Lines: 31
Message-ID: <[e-mail]>
X-Newsreader: Forte Free Agent 1.1/16.230

Hi Gang;
        well with the Holiday season barreling down on us, I decided
too give my page some addtions and face lift.
Please, stop by and wonder around. I've made it easy to go from page
to page, without going back to my home page, you can now access any
page, from any page..
i have added 2 new pages....auction & for sale or trade, pages...still
working on both, but, there up for your viewing....
please, any comments o4r suggestions, are always welcome.
another thing i will be doing, is making thumbnail's out of most of
the pic's on my home page, to hurry the loading along for you..(om my
system it takes about 30-45 seconds to load)
        well, gotta run for now, getting late....

**** Please, Visit my Web Page.....****
=================================================]-[->
Robert Fowle      KC8DBC
The HAMMARLUND Historian
Ph. 517-789-6721
1215 Winifred
Jackson, Mich. 49202-1946
E-mail:  [e-mail]
Web Page:  http://www.jacksonmi.com/hammarlund
while your there, check out the 'AUCTION' link......
                 HAMMARLUND LITERATURE WANTED
WANTED: MANUALS FOR ANY MAKE RADIO EQUIPMENT
=================================================]-[->
see it first on my list...to be put on the 'mail list'  (send me email)
or see it later in.....
Boatanchors  news group:   rec.radio.amateur.boatanchors



From [e-mail] Mon Nov 25 19:08:33 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Schematics for 6146 power amp
Date: 24 Nov 1996 09:03:56 GMT
Organization: AOL http://www.aol.com
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]


   Does anyone happen to have any schematics for an RF amplifier wich uses
1 or more 6146 tubes?  Please email to the following account not this one.

Thanks

[e-mail]


From [e-mail] Mon Nov 25 19:08:34 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 24 Nov 1996 05:17:17 -0700
Organization: Internet Access of Ventura County
Lines: 28
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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In article <[e-mail]>, [e-mail]
wrote:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
>
> >True enough, 'it ain't DC', Wes, and the currents are not in phase, the
> >exercise in question was to calculate the ratio of the current through
> the
> >parallel R and L components.  In doing this, I obviously ignored the
> >intrinsic L in the resistor and I ignored the intrinsic R in the
> inductor.
>
> Rich, you seem to consider circuit design a collection of generic values.
> You arbitrarily assigned a value of 50 ohms to the resistor, and .070 uH
> to the inductor. The AL-80 series uses a 100 ohm resistor, not 50. The
> inductance of later units was indeed reduced to ~85 nH, mainly due to
> reduced grid lead and anode lengths,
 ...snip...

I could do the calculations for the AL-80's  100 ohm suppressor R and 85nH
suppressor L---if you provide the anode resonant frequency for the AL-80,
Tom..
-------------------------------
e-mail copy to Mr. Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Mon Nov 25 19:08:35 1996
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From: [e-mail] ([e-mail])
Newsgroups: rec.radio.amateur.homebrew
Subject: RF Test Engineering Reference Material
Date: Sun, 24 Nov 1996 12:26:27 GMT
Organization: BuffNET
Lines: 21
Message-ID: <579fbf$[e-mail]>
NNTP-Posting-Host: dppp11.buffnet.net
X-Newsreader: Forte Free Agent 1.0.82

Greetings,

Can anybody recomend a good reference book on testing of
receiver/transmitter performance. A lot of material seems scattered
about in old Ham Radio magazines and ARRL handbooks. RF Design and RF
& Microwaves sometimes talks about test but, I havent come across a
book targeted for the RF test engineer types.

BTW: Someone who can place back issues Ham Radio on CD ROM today could
make a  bundle. Some of the best technical articles I have seen are in
those moldy old pages.

The kind of testing I'm interested in would be noise
figure/sensitivity, IP ,dynamic range, SINAD etc...

I guess I want to be a RF test engineer some day.....

Thanks for any ideas

 -- db --   (AA2GF)



From [e-mail] Mon Nov 25 19:08:36 1996
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From: [e-mail] (Scott Sidener)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Help (manuals) HP8060C 1-2600MHz Sig. Gen.
Date: 24 Nov 1996 14:18:24 GMT
Organization: UMR Missouri's Technological University
Lines: 13
Message-ID: <579lfg$[e-mail]>
NNTP-Posting-Host: saucer.cc.umr.edu
X-Newsreader: TIN [version 1.2 PL2]

Hi,  I am having problems with a HP 8060C Synthisized Signal Generator
that has the 86633B Modulation System and 86603A RF Section 1-2600MHz.

If you have any manuals or possibly dead pieces for spare parts or any
suggestions could you please mail me.

Thanks,

Scott Sidener
N0WFL

[e-mail]



From [e-mail] Mon Nov 25 19:08:37 1996
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From: [e-mail] (rchappel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TVI & RF Grounding
Date: Sun, 24 Nov 1996 15:15:10 GMT
Organization: Netcom
Lines: 25
Message-ID: <579p28$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (rchappel)
NNTP-Posting-Host: min-mn3-06.ix.netcom.com
X-NETCOM-Date: Sun Nov 24  9:19:36 AM CST 1996

>
> TVI & RF Grounding
>
>
>  Rick,
>  Seems to me that you could run a separate circuit of 230 and 115
>  for your station, and use TVI bypass capacitors on that circuit
>  in addition to the circuit for the TV and doorchime.

 .  .  .  snipped  .  .  .

When I first got started in this hobby, I also had severe TVI problems.
 This was with cable television which I had expected to be basically
immune to such problems.  I tried everything I could think of and
everything suggested to me by other hams in the local area.  I was in
the process of surrounding an older VCR with a metal box that I had
created as a shield when I discovered that the cable connectors were
only hand tight.  When I tightened them - loo and behold the TVI on that
set went away.  I then checked the other two TVs and guess what - they
too had loose connectors.  True - I use a good quality low pass filter
at my end but when I tightened all the connectors at the TV end the TVI
disappeared.

Bob Chappelear
AB0CI


From [e-mail] Mon Nov 25 19:08:38 1996
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From: Dan Bryden <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Peter Dahl
Date: Sun, 24 Nov 1996 08:00:07 -0800
Organization: Delta Internet Services, Anaheim, CA
Lines: 3
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Reply-To: [e-mail]
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I've seen Peter Dahl's name listed several times in reference to
supplying transformers for power amplifiers. Does anyone know where I
can contact him for more info.  Dan


From [e-mail] Mon Nov 25 19:08:40 1996
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From: Chris Whiteside <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CQ June'96 QRN Squasher, does it really work ?
Date: Sun, 24 Nov 1996 08:19:14 -0800
Organization: Earthlink Network, Inc.
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
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Dave Hayes wrote:
>
> [e-mail] wrote:
>
> >
> >I did a longhand analysis of this circuit and could find no source of
> >phase shift, other than a 180 degree flop as zero amplitude was crossed
> >with either pot.
>
> I modeled the circuit using Pspice, and also could not see exactly how it
> would work under various conditions. It also displayed a fairly uneven and
> falling frequency response.
>
> There is a 'noise bridge' type noise reduction unit published in William R.
> Nelson's "Interference Handbook". It uses only passive components. It also
> requires moving coil taps to tune it, which is not a very satisfactory
> solution.
>
> Does anybody know of a published circuit other than these two? I would like
> to experiment. I don't want to cough up $175 for the ANC-4, since I don't
> need the transmit capability, and my needs are infrequent.
>
> Dave Hayes

I built up the board using FAR circuit board. Used the NTE replacement
FETs DeMaw suggested from Mouser.

Didn't do much for my line noise (which is radiating into the antenna).
Was able to cancel the computer trash somewhat. Circuit badly needs a
preselector in front. My best solution was to just raise the antenna
higher. (Now what am I going to put in that box?)

chris N4ARP


From [e-mail] Mon Nov 25 19:08:41 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!usenet.eel.ufl.edu!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!news-peer.gsl.net!news.gsl.net!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-stk-11.sprintlink.net!news.callamer.com![e-mail]
From: [e-mail] (Jerry Parker)
Newsgroups: rec.radio.amateur.homebrew
Subject: Holiday Special
Date: Sun, 24 Nov 1996 16:27:51 GMT
Organization: Call America Internet Services  [phone]
Lines: 5
Message-ID: <579sqf$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: cts1-027.snlo.dialup.fix.net
X-Newsreader: Forte Free Agent 1.0.82

Dan's Small Parts is running a GREAT Holiday Special on his Internet
Catalog,,,Check it out....

http://www.fix.net/dans.html



From [e-mail] Mon Nov 25 19:08:41 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!ais.net!newsfeed.concentric.net!news-master!voyager.cris.com!Insight
From: INSIGHT Services <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Transmatch schematics / info ?
Date: Sun, 24 Nov 1996 11:57:31 -0500
Organization: Concentric Internet Services
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: voyager.cris.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

I am looking for information on building a transmatch . Or buying one if
they are available at a low cost. Since I will be using a dipole and want
to work several bands this seems the logical answer. Please let me know
your comments, suggestions, etc.

Thanks !

Susan Driggers
Tech Plus in Training




From [e-mail] Mon Nov 25 19:08:42 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!zombie.ncsc.mil!paladin.american.edu!02-newsfeed.univie.ac.at!newsfeed.uk.ibm.net!news.stealth.net!news.idt.net!cam-news-hub1.bbnplanet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: F.S. - Tubes, radios, books and much misc.....
Date: 24 Nov 1996 17:01:34 GMT
Organization: AOL http://www.aol.com
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

FOR SALE:  Tubes, test equipment, radios including Hallicrafters,
Hammarlund, and Philco. Other older tube type radios and radio related
publications.  Schematics for many radios just $1.  Tube Manuals, Tube
Substitution books, Service Manuals, QST magazines, much more from the
30's, 40's, 50's, 60's.  Now over 1500 different tube types in stock -
E-mail [e-mail] and ask for my latest RADIO list  - #1123-T.


From [e-mail] Mon Nov 25 19:08:43 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!enews.sgi.com!news.sgi.com!news.bbnplanet.com!su-news-hub1.bbnplanet.com!arclight.uoregon.edu!news.uoregon.edu!news.acsu.buffalo.edu!acsu.buffalo.edu!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: TEFLON WIRE
Date: Sun, 24 Nov 1996 12:10:03 -0500
Organization: University at Buffalo
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ubppp-222-100.ppp-net.buffalo.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
NNTP-Posting-User: jskalski
X-Mailer: Mozilla 3.0 (X11; U; Linux 2.0.23 i586)

Mil Spec silver plated stranded 22 & 24 AWG high temperature hook up
  wire.
  50' rolls
  5 roll color assortment (250' total) shipped priority 2 day mail $23.
  No color choices at this price, just 5 different colors.

  great for building your own satellite, amplifier, rewiring the space
  shuttle, your own plane, or whatever.

  will not melt when you solder it.
  rated at 200 degrees C and 600v.

  Compare at triple the price. you won't find it cheaper.
  If you find it cheaper I would like to know about it.

  If interested contact [e-mail]

  Jim (N2GO)

  I am interested in trades for amateur equipment for larger quantities.
  I have 1000' rolls for $92 shipped CONUS.


From [e-mail] Mon Nov 25 19:08:45 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsfeed.internetmci.com!news.wco.com!news
From: J&J Mac <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Using 30Mhz SWR meter at 50Mhz
Date: Sun, 24 Nov 1996 09:40:21 -0800
Organization: West Coast Online's News Server - Not responsible for content
Lines: 32
Message-ID: <[e-mail]>
References: <[e-mail]> <572h4j$[e-mail]>
NNTP-Posting-Host: mercury24.wco.com
Mime-Version: 1.0
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X-Mailer: Mozilla 2.02Gold (Win95; I)

Mustang Maniac wrote:

>
> I've been using a cheap Vanco $10 CB-type VSWR meter since the mid
> 1970s on all bands from 80m through 2m, and it works just fine.  The
> "purists" will argue that the VSWR measurement is not accurate, and
> they're absolutely correct.  But who cares?  What does the meter
> reading actually matter?  You adjust your antenna system for the
> minimum reflected power (whatever that may be) and that's it.  You
> get it as low as it will go, and that's as low as it will go.  The
> actual numbers don't matter.  I've heard "newbies" on 2m complaining
> that they spent hours and hours trying to get the VSWR on their 2m
> antenna from 1.3:1 down to 1.2:1 and couldn't do it, and they were
> genuinely in a panic about it.  Must've been former CBers.  I know
> I felt that way when I made the transition from CB to ham back in
> the 1970s.  Then I learned the truth about VSWR, and now I really
> don't worry.  Anything below 2:1 is tolerable, and anything below
> 1.5:1 is down-right great!
>
> Use the meter you have, and don't waste your money on another one,
> unless you're one of those anal-retentive types who's hooked on
> numbers.
>
> 73 from Texas!
>

Well said Dean.. I've been using the same thing since 1976.. Good ol Vanco.

But I have seen other VSWR meters that have limits on the their diodes such th
at at QRP I cannot calibrate the
meter to a point that I would feel comfortable measuring with.

73' Jim..   KB6ZOP


From [e-mail] Mon Nov 25 19:08:46 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 24 Nov 1996 18:03:03 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>
>  I contend that since roughly half of the VHF current flows through the
L,
>a resistive conductor offers a VHF-dampening advantage.  Dipmeter-tests
>with such a VHF-suppressor installed in various amplifiers demonstrates
>that with a nichrome L, the VHF dip is broad and shallow.
>
>

Whatever happened to the technique where the
 parasitic suppressor is  placed in series with
the cathode of a GG amp?  I use one in my SB-220,
and it never spits, arcs, or misbehaves.

Pete


From [e-mail] Mon Nov 25 19:08:47 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in1.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sun, 24 Nov 1996 11:28:37 -0700
Organization: Internet Access of Ventura County
Lines: 41
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port55.vcnet.com
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In article <[e-mail]>,
[e-mail] wrote:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
>
> >
> >  I contend that since roughly half of the VHF current flows through the
> L,
> >a resistive conductor offers a VHF-dampening advantage.  Dipmeter-tests
> >with such a VHF-suppressor installed in various amplifiers demonstrates
> >that with a nichrome L, the VHF dip is broad and shallow.
> >
> >
>
> Whatever happened to the technique where the
>  parasitic suppressor is  placed in series with
> the cathode of a GG amp?  I use one in my SB-220,
> and it never spits, arcs, or misbehaves.
>
> Pete
--------------------------
  I include a cathode-resistor (Rc) in my low VHF-Q parasitic suppressor
retrofit-kit for the SB-220.  The reason that Rc works in the SB-220 is
that that there are two VHF-resonant circuits---one in the cathode (input)
circuit and one in the anode (output)  circuit.  The frequency of both
resonances is roughly 110MHz---obviously not a good situation unless one is
trying to build a 110MHz oscillator.
 With average-gain 3-500Zs, putting a VHF-dampening device in either the
input or output circuit may produce stability.  However with above-average
gain 3-500Zs, using a VHF-dampening device in both the input and in the
output is indicated.

 BTW, the SB-220's input-resonance at 110MHz is created by the length of
the RG-58u coaxial-cable that Heath specified between the tuned-input
bandswitch and the cathodes of the 3-500Zs.
-----------------------------------------------
e-mail copy to 'Pete' and to Mr. C. Tom Rauch

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Mon Nov 25 19:08:48 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!news.bbnplanet.com!su-news-hub1.bbnplanet.com!news.pbi.net!news1.rcsntx.swbell.net!usenet
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: DDS Ckt artwork available
Date: Sun, 24 Nov 1996 19:12:00 GMT
Organization: Southwestern Bell Internet Services
Lines: 10
Message-ID: <579vkb$[e-mail]>
NNTP-Posting-Host: ppp-151-164-41-176.rcsntx.swbell.net
X-Newsreader: Forte Free Agent v0.55

Homebrewers special....
Email your request for files...

20Mhz DDS signal generator, Interfaces to PC's LPT1 port.
Files include artwork, schematic, etc in HPG format.  artwork is
printable to laser printer for toener-transfer or transparancy PCB
making methods. includes breadboard area.

[e-mail]



From [e-mail] Mon Nov 25 19:08:50 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood 850SAT & Autoswitching antenna systems
Date: 24 Nov 1996 19:17:14 GMT
Organization: AOL http://www.aol.com
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

I would like to find out if anyone has figured out how to have a Kenwood
TS850SAT "drive" a remote antenna switch.  I have a beam for 20-15-10 and
a all-band wire.  I want the Kenwood to "tell" the switch when it's on
20-15-10 and then I'd like it to "tell" the switch when it's on any other
band (to select the wire).

It's my understanding that "data" appears SOMEWHERE coming out of the
850SAT.  This data supposedly has the band information selected from
either the VFO or the mem channel.  I'd like to use this "data" to drive
the switch.  I haven't purchased the switch yet but I feel most of the
popular (Unadilla, Ameritron, etc) commercial brands would do.

But, I suspect I'll be homebrewing an external interface to bring whatever
"data" the Kenwood's putting out over to the relays (in the switch).  But
first I have to determine "Is there data" and "where the heck is it coming
out and it'd be nice to know "what form is it being presented in".  Don't
tell me to call Kenwood - I burned up my life's savings last week on hold
and got nowhere with them.

So, if you know something about this (or if you know someone who might
know) please share your info with me.  If you know someone at Kenwood,
that'd be helpful too.  Wouldn't it be terrific IF someone out there HAS
ALREADY DONE THIS and could share that information with me!!!??

I thank you.

AOL - WB1DSW @ AOL.COM
AMATEUR RADIO - WB1DSW @ WB1DSW.NH.USA.NOAM


From [e-mail] Mon Nov 25 19:08:51 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!bigboote.WPI.EDU!cam-news-feed2.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!news.idt.net!cdc2.cdc.net!news.texas.net!news
From: [e-mail] (Dave)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Sun, 24 Nov 1996 19:18:32 GMT
Organization: Texas Networking, Inc.
Lines: 18
Message-ID: <57a3vj$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <55remb$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]>
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[e-mail] (tyler) wrote:

>This is really getting off topic, but I couldn't resist:
>What's the difference between a dead dog on the road and a dead lawer on the
>road?

>There are skid marks in front of the dog!
>Tyler

and to get further out of hand-

there are three differences between lawyers and lab rats:

1) lawyers reproduce faster than rats
2)lawyers will do things that rats refuse  to do
3)  unlike rats,  if you experiment on lawyers, the staff doesnt get
attached to them



From [e-mail] Mon Nov 25 19:08:52 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!paperboy.ids.net!anomaly.ideamation.com!anomaly.ideamation.com!not-for-mail
From: [e-mail] (Anthony S. Pelliccio)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: 24 Nov 1996 15:47:06 -0500
Organization: Ideamation, Inc.
Lines: 12
Message-ID: <57ac8a$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]>
NNTP-Posting-Host: anomaly.ideamation.com
Xref: news1.epix.net rec.radio.amateur.antenna:31986 rec.radio.amateur.digital.misc:20283 rec.radio.amateur.dx:1398 rec.radio.amateur.equipment:42950 rec.radio.amateur.homebrew:21384 rec.radio.amateur.misc:118795 rec.radio.amateur.policy:43441 rec.radio.amateur.space:8903

In article <57a3vj$[e-mail]>, Dave <[e-mail]> wrote:

>1) lawyers reproduce faster than rats
>2)lawyers will do things that rats refuse  to do
>3)  unlike rats,  if you experiment on lawyers, the staff doesnt get
>attached to them
>
For some absolutely hysterical lawyer jokes surf on over to
http://cartalk.com and look for the picture of a shark with a tie on. Click
on it and be launched into a sampling of NOLO Press' favorite lawyer jokes.

Tony


From [e-mail] Mon Nov 25 19:08:53 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!panix!netaxs.com!usenet
From: Keslar <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Want: Plans for a Chrystal controled 2 m FM radio
Date: Sun, 24 Nov 1996 16:26:24 -0500
Organization: Net Access - Philadelphia's Original ISP
Lines: 7
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Hi all,

I am looking for plans to a CRYSTAL controled 2 meter FM radio.
If you have plans or know where to get them could you e-mail me them.
Thanks in advance.
73,
DE KB2WKW - Kenny


From [e-mail] Mon Nov 25 19:08:54 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-stk-200.sprintlink.net!news.callamer.com!oso.slonet.org!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.ssb
Subject: balancing tubes: how?
Date: Sun, 24 Nov 1996 14:09:31 -0800
Organization: Call America Internet Services  [phone]
Lines: 7
Message-ID: <[e-mail]>
References: <56bbbe$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <575asp$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.dx:1394 rec.radio.amateur.equipment:42928 rec.radio.amateur.homebrew:21375 rec.radio.amateur.misc:118784 rec.radio.amateur.space:8901

What is the better way of balancing tubes such as 3-500Z units?  Is is
better to balance the standing current for a given bias (zero bias in the
3-500 units of course) or should the plate current be measured at a give
RF drive for each tube?  One measures the mu of the tube while the second
approach measures the transconductance.  Which is more practical for hams?
Cliff Buttschardt   K7RR ex W6HDO  Morro Bay, CA  [e-mail]



From [e-mail] Mon Nov 25 19:08:55 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!EU.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in3.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: [e-mail] (Jim Potter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Peter Dahl
Date: Sun, 24 Nov 1996 22:39:04 GMT
Organization: The Santa Fe Institute
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]>
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Dan Bryden <[e-mail]> wrote:

>I've seen Peter Dahl's name listed several times in reference to
>supplying transformers for power amplifiers. Does anyone know where I
>can contact him for more info.  Dan

The Internet address I have for Peter Dahl is:

http://www.1eagle1.com/commercial/pwdco/

You can get stock designs or custom designs. They make good stuff at a
fair price and with good delivery.

I recommend them highly.

Jim


James M. Potter, President              TEL: [phone]
JP Accelerator Works, Inc.              FAX: [phone]
2245 47th Street                        EMAIL: [e-mail]
Los Alamos, NM 87544-1604               URL: http://www.jpaw.com



From [e-mail] Mon Nov 25 19:08:55 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!howland.erols.net!ais.net!noc.van.hookup.net!nic.mtl.hookup.net!rcogate.rco.qc.ca!altitude!usenet
From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help to Find
Date: Sun, 24 Nov 1996 18:25:35 -0500
Organization: ORION Microsystems
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dynappp-47.hip.cam.org
Mime-Version: 1.0
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David Bindle wrote:
>
> I need to help to locate suppliers for the following components:
>
> 11C90 prescaler that divides by 10 (Plessey?)
> 95H90 divide by 10 Fairchild decade counter
> MAR6 mmic (used to be handled by Mini-Circuits)
>
> any help would sure move my project along, even someone with a good junk
> box.
>  Contact Ken/ VE5KRB on this news group or    [e-mail]
> 73's and TNX

Go to my page Electronic Links and you will certainly find
your info.

-------------------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows


From [e-mail] Mon Nov 25 19:08:57 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!feed1.news.erols.com!howland.erols.net!newsxfer2.itd.umich.edu!news.sprintlink.net!news-chi-8.sprintlink.net!TCNNTP.trader.com!not-for-mail
From: Malcolm Mallette <[e-mail]>
Subject: Sherlock system -- Alternate Chip
Message-ID: <[e-mail]>
Date: Sun, 24 Nov 1996 19:01:56 -0500
Reply-To: [e-mail]
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After my article on the Sherlock transmitter fingerprint system appeared
in September 1996 CQ/VHF, I received an e-mail to the effect that the
A/D chip used in the hardware, the MAX150 , had been backordered.

Another e-mail suggested I try the National Semiconducter ADC 0820 as a
replacement.

The national Semiconducter ADC0820 can be used in place of the MAX150
with no adverse affect.

However, a minor change in the circuit board must be made.

On the Far Circuits board, disconnect pin 12 on the A/D chip socket (
the one for the MAX150 ) from pin 19 on the same socket by breaking the
trace. Leave pin 12 connected to the two caps to ground.  Connect a 1.5
K resistor from pin 12 to ground and another 1.5 K resistor from pin 12
to regulated 5 volts + .

The MAX150 has a 1.5 V+ reference voltage out available on pin 19. The
ADC0820 has no reference voltage out. THe change supplies from 2 volts
to 2.5 volts as a reference voltage to pin 12 of the ADC 0820  That pin
is the reference voltage in on both chips.

FAQ about Sherlock:

How can a get a schematic?  If you are outside of the U.S., send me an
e-mail.. If you are in the US ( or Canada ) find a copy of Sept 1996
CQ/VHF.

Where is the Sherlock software available:  ftp.hcares.gen.in.us  also
should be in the
oak.oakland.edu website through the Boston Radio Club subpage.

Why use this hardware plus software instead of the program that uses a
sound card:

        1. You do not have a soundcard or the other program does not work with
your
           soundcard.

        2. You like to build.

Is the software free?   Yes.

Will you give me the source code?   No.

What does it take to run the software?  A 486 DX 33 minimum PC clone
with a parallel port of any type.  (LPT1) And with VGA

Will the system always be able to distinguish between transmitters of
the same make and model?  Read the article.

Are Circuit boards available?  Yes  FAR Circuits, 18N640 Field Court,
DUndee, IL 1900t   847-576-3540.

Should I start sending e-mail to you before I have read the article?
No.

Can I build it without the circuit board?  Yes.  Is it easier to use the
board? Yes.

How much does the hardware cost?   About $65 with case using the MAX 150
About $50 using the ADC0820.  This is more or less what you have on
hand.

73

Malcolm  WA9BVs



From [e-mail] Mon Nov 25 19:08:58 1996
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From: [e-mail] (Gerald Crenshaw)
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space,
Subject: Need an Article for a Newsletter?????
Date: Sun, 24 Nov 1996 19:34:31 -0600
Organization: INTERNET AMERICA
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: dal31-15.ppp.iadfw.net
Xref: news1.epix.net rec.radio.amateur.antenna:31983 rec.radio.amateur.equipment:42946 rec.radio.amateur.homebrew:21382 rec.radio.amateur.misc:118793 rec.radio.amateur.policy:43439 rec.radio.amateur.space:8902

Hi,
  Name here is Gerry (WD4BIS) and I have been writing a column for our
club newsletter called "New Ham Partner". With the influx of No Code
Technicians on the repeater, asking the same kinds of questions I asked 20
years ago, I have been trying to answer them.
   Some of the articles are technical, some of them are general
information, but they all address subjects that our new friends are
struggling with.

I have set up a web page for these articles. On this page, I will place
the columns I have already published in past issues of our newsletter.
Doing this on a web page has advantages, the big one being that the
articles wont expire in a newsgroup, I can edit old ones or add new
columns as write them, and I wont have to send re-posts.

The Cost... I will ask that you do not edit the articles, and use my
by-line. If you use them, send me an E-mail and let me know when and
where. If you have a spare stamp mail me a copy of your newsletter to the
address on the page.

Where...  http://web2.airmail.net/gerryc/newham.html

Please bear in mind this site is still under construction and not all of
them are there yet, but they soon will be. (I have Thanksgiving week off)

73's

Gerry Crenshaw


From [e-mail] Mon Nov 25 19:08:59 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More amplifier stuff
Date: 25 Nov 1996 01:58:36 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 31
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References: <[e-mail]>
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Rich recently posted the following:

>Big organizations don't always do the right thing, Tom.  NASA launched
>Shuttle Mission 25  even though NASA had videotapes of 10 previous
>missions
>where fire could be seen coming through the o-rings on the booster
>rockets,
>adjacent to the main hydrogen tank, no less.

This isn't radio, but I also don't think it's true.  I'm looking at a
chart from Richard Feynman's account of the Challenger investigation and
it shows only seven missions in which there was any O-ring incident and
17 in which there were none.  The 7 incidents involved erosion of the
O-ring, but not, so far as I know, fire shooting out the side of the
rocket.  Perhaps, a specific reference to Rich's source would be in
order.

                                                       Dave  KE9ED

>>

Hi Dave,

Perhaps Rich is preparing us for the revelation that the O ring failure
was due to a parasitic oscillation, or perhaps photons from a solar flare
caused the failure.

Other than that, I'm having a hard time understanding what this has to do
with all his wild theories and claims about parasitics.

73 Tom


From [e-mail] Mon Nov 25 19:09:00 1996
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From: "CJ Lagos" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: TH-79A(D) 800Mhz
Date: 25 Nov 1996 02:44:49 GMT
Organization: US Net - MD,DC,VA ISP - [e-mail]
Lines: 11
Message-ID: <01bbda7a$b8a7ca90$0a66f0c6@general>
NNTP-Posting-Host: midnight.us.net
X-Newsreader: Microsoft Internet News 4.70.1157
Xref: news1.epix.net rec.radio.amateur.equipment:42952 rec.radio.amateur.homebrew:21385 rec.radio.amateur.misc:118798

        Recently, A message was posted about the TH-79A(D) and 800Mhz.  One person
said that 9 UHF parts were missing from the radio and that they were worth
about $14.00.  I have not been able to contact him via e-mail due to a
problem with Worldnet's mail server.  Can anyone tell me which parts they
are, where to get them etc ...?

        I was always under the impression that the radio's logic prevented
reception not the actual parts on-board.

                                                                        Thanks again,
                                                                                CJ <[e-mail]>


From [e-mail] Mon Nov 25 19:09:01 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: assist
Date: 25 Nov 1996 02:51:12 GMT
Organization: World Net, Inc. - San Antonio, TX
Lines: 15
Message-ID: <57b1j0$[e-mail]>
NNTP-Posting-Host: 208.128.252.50



Hello. I know there must be a proper group someplace to ask for help,
but I haven't found it yet..
   I have a monitor with a leaking zener diode. Number on it is 27B2 .
I have been unable to find it in any of my reference books. Can someone
out there tell me the voltage ??
   Thanks es 73
   Keith..KO4SX

Keith Poindexter
[e-mail]

Net-Tamer V 1.07 - Registered



From [e-mail] Mon Nov 25 19:09:02 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!news.stealth.net!newsfeed.uk.ibm.net!news-m01.ny.us.ibm.net!news-s01.ca.us.ibm.net!default
From: [e-mail] (tim)
Newsgroups: rec.radio.amateur.homebrew
Subject: vhf-matching to ant balun
Date: Mon, 25 Nov 96 03:50:29 GMT
Organization: fudpuckers
Lines: 7
Message-ID: <57b52h$1km0$[e-mail]>
NNTP-Posting-Host: slip166-72-196-202.fl.us.ibm.net
X-Newsreader: News Xpress 2.0 Beta #2

Any info on toroid type baluns is very helpful.like to use 50ohm unbalanced to

300 ohms balanced. thanks,

              Tim KF4FCO-EM70 Spamless Ham REPLY WITH CARE
             I'AM PC HANDICAPED AND I TYPE WITH TWO FINGERS
              AND I SUFFER FROM LAP TOP FEVER!!!!!!!!!!!!!!
             :*********************************************]


From [e-mail] Mon Nov 25 19:09:03 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 25 Nov 1996 03:57:31 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 78
Message-ID: <[e-mail]>
References: <[e-mail]>
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X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

> With average-gain 3-500Zs, putting a VHF-dampening device in either the
>input or output circuit may produce stability.  However with
above-average
>gain 3-500Zs, using a VHF-dampening device in both the input and in the
>output is indicated.

This comment puzzles me Rich.

You attribute a wide gain variation to tube differences, indicting it is
an input to output feedback loop.

The worse engineering mistake in the  SB-220 was the inclusion of chokes
in paralle with capacitors from the grids to ground in the SB-220. It
makes that PA subject to VLF parasitics, and destroys gain flatness. It
makes the tubes less stable at VHF also. The single most important mod to
an SB-220 is to ground the grids right at the tube pins with very very
short leads.

You attribute problems to the gain of tubes. The gain of a grounded grid
PA, due to fact the input circuit is in series with the output RF path, is
determined by the ratio of cathode driving to anode output impedance.

In thousands of tubes of all types, I see very little gain difference.
There are even reject limits, for example  3CX1200A7's with as little as
.5 dB gain difference are rejected. That amounts to one tube in every few
hundred.

If there was a 3 dB gain difference, it would also show up as a radical
input (going from 1:1 to 2:1 VSWR) impedance difference, since the output
impedance is set by the amount of High Voltage and plate current.

I find your personal attacks an act of desperation. You seem to be unable
to support your claims technically, since most of your statements
contradict yourself. While you openly contradict yourself, you accuse me
of smoke and mirrors.'

Let me give an example of an obvious contradiction. You claim the Chinese
tube's glass is melted by parasitics, yet you also claim any parasitic
will arc the bandswitch, tuning cap or damage the grid of the tube. In
order to melt the glass, the parasitic would have to have many hundreds of
kilovolts sustained from the anode through the glass to an external
conductor.

You allude to Vectronics using your suppressor, yet you failed to mention
after they installed your suppression system field service history did not
improve. Your suppression kit was removed from the Vectronics PA's within
several months of the initial test.

You cling to the idea that photons cause parasitics, even though a
physicist that works in that area disputed your claims. You very clearly
said you tested tubes involved in "standby flashovers", and they had no
gas. Now you have claimed they DO have gas, like the geiger-muller tube.

The gas filled geiger-muller tube has less than a pico-ampere of current
induced by radiation, yet you claim the almost perfect vacuum in a power
grid tube tube (that had no gas in the start but now does) will support a
large sustance current from external photons.

You claim in most PA's a sudden burst of VHF energy damages grids,
bandswitches, and arcs capacitors over, yet we are to believe a Chinese
3-500 has glass failure from the same cause.

I measured the very same style capacitor used in the SB-220, AL-80 series,
Vectronics PA's and later Drake PA's, and found no high impedance points
up to several hundred MHz, yet you claim these PA's can arc that capacitor
over from VHF energy.

You insist a tiny grid rated at 25 watts, will dissipate 500-700 watts.
Yet we know the massive 3-500Z anode will become incandescent long before
dissipating 500 watts.

None of your claims make technical sense, so you have now reverted to
personal slander of me and even NASA. This act of desperation is pitiful.

73 Tom


From [e-mail] Mon Nov 25 19:09:04 1996
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From: [e-mail] (Tadashi Haraguchi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Valves for 50MHz
Date: 25 Nov 96 07:42:46 GMT
Organization: ucsd usenet gateway
Lines: 11
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


>Does anyone know if 572B's will also work on 6m?

It might work on 6m. I was able to get 400Watts output by modified YAESU
FL-2100B (572B pallarel GG amplifier). The driving power is required 80W.

---------------------------------------------------------------------------
Tadashi Haraguchi
JE3TXU/1, Tokyo Japan
E-Mail : [e-mail]



From [e-mail] Mon Nov 25 19:09:05 1996
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From: [e-mail] (Brian Carling)
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Valves/Tubes Data Website! !
Date: Mon, 25 Nov 1996 09:49:03 GMT
Organization: Monumental Network Systems
Lines: 39
Distribution: inet
Message-ID: <57c4dp$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news1.epix.net rec.radio.amateur.boatanchors:699 rec.radio.amateur.homebrew:21392

Hey guys - check out this web site.
He has some great stuff here - tube base diagrams, pin-outs etc. etc.
Let's hope it grows! How about e-mailing him with some MORE pin-out data to
add to this list? It can be a GREAT resource on the WWW. I wish more people
would put up data like this that tube homebrew folks can use!

Let me know what you think of his pages. All the best - Bry, AF4K

Begin forwarded messge:
=======================
From:             [e-mail] ()
Subject:          Valves/Tubes Web Page
Date sent:        14 Nov 1996 17:36:32 GMT
Organization:     XS4ALL, networking for the masses

Good-day fellow radio enthusiasts. This is just a quick note to let
you know that I have started to set up a Web page with some valve/tube
information which I hope will be of help to those interested in restoring,
repairing or using valve/tube - based equipment. I have had a few positive
reactions to my first effort, but of course I welcome any good suggestions
and constructive criticism in order to improve the page, which I started
following a reply I was able to post to someone elses posted query.

The page should be accessible at: <http://www.xs4all.nl/~tgale/valves.html>

I find that most discussion in respect of this subject can be found
on the newsgroup <news:rec.antiques.radio+phono> but I thought I would
post this note to a couple of other groups where people might be
interested as well.

Regards, and 73's, F.C. Trevor Gale, G8GFH (resident in The Netherlands).
==========================================
End forwarded message.

73 from Amateur Radio AF4K  /  G3XLQ
http://www.mnsinc.com/bry
E-mail:  [e-mail]
Home of MEGALIST ham radio files, pirate links etc. etc.



From [e-mail] Mon Nov 25 19:09:06 1996
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From: [e-mail] (Brian Carling)
Newsgroups: rec.radio.amateur.homebrew
Subject: Web Info - parts & suplies
Date: Mon, 25 Nov 1996 10:01:34 GMT
Organization: Monumental Network Systems
Lines: 11
Distribution: inet
Message-ID: <57c558$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82

Have a look at:
http://www.mnsinc.com/bry/
I have a lot of resources there of interest to AMATEUR and SW RADIO
enthusiasts!

All the best - Bry
73 from Amateur Radio AF4K  /  G3XLQ
http://www.mnsinc.com/bry
E-mail:  [e-mail]
Home of MEGALIST ham radio files, pirate links etc. etc.



From [e-mail] Mon Nov 25 19:09:07 1996
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From: [e-mail] (Lars Moell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help (manuals) HP8060C 1-2600MHz Sig. Gen.
Date: Mon, 25 Nov 1996 10:06:57 GMT
Organization: National Defence Research Establishment, Sweden
Lines: 24
Message-ID: <[e-mail]>
References: <579lfg$[e-mail]>
NNTP-Posting-Host: larsm.lin.foa.se
X-Newsreader: Forte Free Agent 1.1/16.230

Hi Scott
I have a 8660C, I guess thats what you got too! I might supply you
with copies from the manual, but they contains quite a few pages! My
8660 is dead but I plan to fix it someday...... I suspect the power
supply in my generator.

73 Lasse SM5GLC

[e-mail] (Scott Sidener) wrote:

>Hi,  I am having problems with a HP 8060C Synthisized Signal Generator
>that has the 86633B Modulation System and 86603A RF Section 1-2600MHz.
>
>If you have any manuals or possibly dead pieces for spare parts or any
>suggestions could you please mail me.
>
>Thanks,
>
>Scott Sidener
>N0WFL
>
>[e-mail]
>



From [e-mail] Mon Nov 25 19:09:08 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!not-for-mail
From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KISS
Date: Mon, 25 Nov 1996 13:41:39 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 12
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
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X-Newsreader: Forte Agent .99e/16.227

On 25 Nov 96 14:51:34 GMT, [e-mail] (Marijan Miletic)
wrote:

.
>AG6K math in calculating R/L current percentages on straight sum is WRONG!
>Supressor inductance on VHF would affect oscilations by changing the phase
>angle and not solely by reactance value.

Mario,  in between  self imposed catastrophic events in your life,
will you imbue this group with your interpretation of the CORRECT
mathematical formula for  the design of suppressors?
Jesse , W6KKT (50 miles from L.A.)


From [e-mail] Mon Nov 25 19:09:09 1996
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From: David Sipe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Peter Dahl
Date: Mon, 25 Nov 1996 10:24:18 -0800
Organization: CalWeb Internet Services, Inc.
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
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X-Mailer: Mozilla 3.0Gold (Win95; I)

Dan Bryden wrote:
>
> I've seen Peter Dahl's name listed several times in reference to
> supplying transformers for power amplifiers. Does anyone know where I
> can contact him for more info.  Dan

Peter W Dahl Co.
5869 Waycross Ave
El Paso Texas 79924
tel [phone]
email [e-mail]
http://www.1eagle1.com/commercial/pwdco/

I called them an they sent me a very nice catalog of their products.


--
73  David   KD6QFZ
[e-mail]


From [e-mail] Mon Nov 25 19:09:11 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KISS
Date: 25 Nov 1996 18:31:21 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]>
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X-Admin: [e-mail]
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In article <[e-mail]>, [e-mail] (W6KKT
Jesse) writes:

>.
>>AG6K math in calculating R/L current percentages on straight sum is
WRONG!
>>Supressor inductance on VHF would affect oscilations by changing the
phase
>>angle and not solely by reactance value.
>
>Mario,  in between  self imposed catastrophic events in your life,
>will you imbue this group with your interpretation of the CORRECT
>mathematical formula for  the design of suppressors?
>Jesse , W6KKT (50 miles from L.A.)

Rich's math is OK, as far as he went.  The values he selected were at the
extreme low end of reactance, but are realistic in a 3-500Z with short
grid and anode leads. The important parameter is the equivilent series
reactance of the anode system, and that can be calculated quite easily.

I already calculated and posted the equivilent parallel circuit values of
the suppressors Rich described, as well as some other more typical values.
The change in VHF Q, when a lossless coil was replaced with a 5 ohms ESR
coil, was almost nil. When those values are translated to the series
equivilent, that circuit is placed in the anode path, you can calculate
the system Q.

There are several ways to do this with either scientific approach or the
Edisonian (cut and try) approach. This would be a good topic for an
article, because too much of this stuff has become "do it this way" rules
of thumb or folklore. Just like the myth tank Q needs to be 12, or the PA
will not operate properly.

73 Tom


From [e-mail] Mon Nov 25 19:09:12 1996
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From: [e-mail] (J. Keith Ostertag)
Newsgroups: rec.radio.amateur.homebrew
Subject: Inexpensive but reliable frequency counter?
Date: 25 Nov 96 19:54:16 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I'm a new ham and a would-be electronics experimenter (no technical
background). One item I would like to own is a frequency counter, but I don't
feel I can justify $300-$400 for a bench model. So I have been looking around
for a kit or some plans to build one myself. There's one in the latest ARRL
Handbook (6-digit, 50MHz) which can be bought as a kit for $79 from Radio
Adventures. I also found two plans in Popular Electronics, a 25MHz 4-digit
model in the Feb 1995 issue and a 50MHz model in the Nov 1994 issue.

Does anyone have direct experience with any of the above? Or maybe someone can
offer an alternative? For instance, might it be better for me to buy one
of those $200 radio frequency counters made by Startek or MFJ?

I just want one to help me play around with RF circuits, for the fun and
education.

-Thanks,

Keith Ostertag, N3KXZ



From [e-mail] Mon Nov 25 19:09:13 1996
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From: "Keith E. Spainhour" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Amp help w/ 304tl
Date: 25 Nov 1996 21:39:03 GMT
Organization: Info Avenue INTERNET Access
Lines: 32
Message-ID: <01bbdb17$ffcbd5e0$LocalHost@ks>
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Hi, I am looking for some help building an amplifier using a 304tl
I already have a 3kv supply for the plate supply. I have the specs on
the tube from Eimac, they are
                DC Plate            3000v
                DC Grid              -400v
                Plate Current     500ma
                DC Grid Current   80ma

                and so on

I have numerous questions, like , what would be a good circuit for this
tube?
Grounded Grid? What about an input circuit? What class would this be ( A,
AB1, AB2)?
I saw somewhere the formula for figuring plate load, but can't remember
where.
I see alot of talk about parasitic suppressers, what would be the best
circuit for this?
I already have the basic hardware stuff started, I need some help on the
finer things!
Any schematics, component values, comments or what ever  would be of great
help.
I know very little about designing amplifiers and any help would be
appreciated.
I also have a 3-400z amperex with socket, would this be a better tube for
this project?
anyone have the specs on this tube?

73
KT4XW
Keith Spainhour
[e-mail]


From [e-mail] Mon Nov 25 19:09:14 1996
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From: Clif <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amplifier Plan Books
Date: Mon, 25 Nov 1996 15:49:58 -0600
Organization: OnRamp Technologies; ISP;  Dallas/Ft Worth/Houston, TX USA
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]>
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To: [e-mail]

[e-mail] wrote:
>
> I would like to learn more about building RF transistor amplifiers. I
> cannot find any good literature around here. Can anyone recommend an
> information source for transistor amplifier building? I am particularly
> interested in building an amplifier using the 2SC2879. Any feedback would
> be appreciated.

Contact RF Parts (1-800-RF-PARTS). They have plans and laid out boards
for the 2sc2879 and 2sc2290.

Clif
AVVid is an Authorized Kenwood and Icom Service Center
http://rampages.onramp.net/~avvid



From [e-mail] Tue Dec 03 19:55:46 1996
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From: Richard Valentine <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Who Answered my Panadaptor Post??
Date: Thu, 21 Nov 1996 22:40:48 -0500
Organization: NETPLEX Internet Access [phone]
Lines: 4
Distribution: inet
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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X-Mailer: Mozilla 3.0 (Win95; I)

My drive crashed, and I'm wondering who answered my Panadaptor
Conversion question????????? - I asked about a conversion to run the
Yeasu FT-1000 with a Kenwood scope.  Someone had answers..Please respond
if you see this!! - Richard Valentine, N1SQJ


From [e-mail] Tue Dec 03 19:55:47 1996
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From: "Chuck (Jack) Hawley" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Yaesu mic. pinout
Date: Thu, 21 Nov 1996 22:57:36 -0600
Organization: University of Illinois at Urbana-Champaign
Lines: 25
Message-ID: <[e-mail]>
References: <572vrs$1rlo$[e-mail]> <[e-mail]>
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Mike wrote:
>
> Hello Tim,
> The pin out on the MD-1 mic plug is as follows. Note that the notch is at
> the 12 oclock position.
> 1. up
> 2. +5v
> 3. down
> 4.
> 5.
> 6. ptt
> 7. gnd
> 8. mic
>
> I took this from the tech manual. The pin dia in my Yaesu ft736r shows
> pin 4 and 5 as "fast", but the tech manual does not show and connections
> good luck, Mike K6YPB

I don't have an MD-1 but my Yaesu 990 has pin 2 and 5 as gnd return for
control functions (ptt, up, dn, etc.) and pin 7 as gnd return for the
audio from the mike. Pin 4 is "fast". The pin numbers are usually
labeled on the front or back on plug and socket.

Chuck, KE9UW



From [e-mail] Tue Dec 03 19:55:48 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!dog.cen.com!gc
From: [e-mail] (Gary Chatters)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Valves for 50 MHz
Date: 22 Nov 1996 18:45:14 GMT
Organization: Century Computing, Inc.,  Laurel, MD
Lines: 9
Message-ID: <574sbq$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: fox.cen.com
Summary: Yes.
Keywords: 807 50MHz  50Mc

In article <[e-mail]>,
Andrew John Burge <[e-mail]> wrote:
>Has anyone any idea if my ancient 807's are likely to produce more
>than heat from the anode on 6M ?  Also I have some 12BY7A's here too

Motorola and GE used 807's in 30-50 MHz land mobile radios, many of which
were converted to 6M.  They'll work.  Don't know about the 12BY7A's.

gc


From [e-mail] Tue Dec 03 19:55:49 1996
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From: paul <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.dx,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.shortwave
Subject: WTB : Collins 75A-3, 75A-4
Date: 23 Nov 1996 07:56:27 GMT
Organization: me
Lines: 5
Message-ID: <576anb$ja6$[e-mail]>
Xref: news1.epix.net rec.antiques.radio+phono:32684 rec.radio.amateur.dx:1446 rec.radio.amateur.homebrew:21573 rec.radio.amateur.misc:119200 rec.radio.shortwave:89436

Anybody have a Collins 75A-3 or 75A-4 willing to sell? Please
respond.

--
me


From [e-mail] Tue Dec 03 19:55:51 1996
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From: [e-mail] (Lars Moell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RELCOM M6D MIXERS??
Date: Mon, 25 Nov 1996 10:01:21 GMT
Organization: National Defence Research Establishment, Sweden
Lines: 57
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: larsm.lin.foa.se
X-Newsreader: Forte Free Agent 1.1/16.230

WJ-M6D
DOUBLE BALANCED MIXER
LO, RF 0.05 TO 200 MHz
IF DC TO 200 MHz
LO +7 dBm (graph shows drive level between -4 and +12 dBm)

Notes:
W-J logo is over pins 1 2 and 5 6
Colored glass insulator at pin 1

Mixer seen with pins facing you:
_________
 | 1   2   3   4  |
 | 5  6    7    8 |
 | _________|

LO 1 and 5
RF 4 and 8
IF: formed by externally connectiong pins 2 and 6 together and pins 3
and 7 together. Best performance is obtained by grounding the 2 and 6

========================================================
WJ H5A
Reactive power divider
0.5-120 MHz
3 ports
0 degrees phase difference
50 ohm impedance
35 dB isolation at 1-60 MHz
Insertion loss 0.5 dB
max phase balance 1 deg
max amplitude unbalance 0.1 dB
max power 1 watt 1-60 MHz


         ------ -3dB--------pin1
pin 4                           -35 dB 1 to 60 MHz
       -------- -3dB--------pin 2
Pins 3 and 5 are groundpins, and both moust be used.

Package D   H5A

       2         1
       5   4    3
Pins facing you.

I may supply you with copies of data sheets if you e-mail me your
fax- no

73 Lasse SM5GLC
Rod Fitz-Randolph <[e-mail]> wrote:

>Does anyone have any information on the Watkins-Johnson/Relcom
>M6D Balanced Mixers and the H5A units?  I need spec sheets or
>something that shows the frequencies, connections of pins, etc.
>Thank you for responding!  Rod, W5HVV



From [e-mail] Tue Dec 03 19:55:52 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.sgi.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Marijan Miletic)
Newsgroups: rec.radio.amateur.homebrew
Subject: KISS
Date: 25 Nov 96 14:51:34 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Our PR-Internet link had some problems (hardware & software made in USA) so
I am bit late on interesting QRO tread.  While preparing for CQ WW CW contest,
I survived 3600V shock thru both hands and combined with a recent light fire
under the bonet of my Chrysler LeBaron at petrol station, I live 4-th life now
!
Gentleman 50 miles from Hollywood was asking while I did so brute test with my
SB-220 shorting the antenna.  Well, I was convinced RF voltage can't go beyond
2 x DC and I went to the worst case situstion (is it scenario in South CA?).
However,  I had many close situations in real life with intermittent antenna
problems, loading capacitor shorts, disconected coax cable shields etc...
AG6K math in calculating R/L current percentages on straight sum is WRONG!
Supressor inductance on VHF would affect oscilations by changing the phase
angle and not solely by reactance value.
I am sure KE4ZV supports KISS approach and if we can explain arcing with simpl
e
model of light load on working frequency, lets refrain from mumbo-jumbo of UFO
effects in a good tradition of an engineering practice.  Catastrophic failures
are beyond a reasonable price/performance design and are usually covered by
insurance or guarantee.
73 de Mario, S56A, N1YU.
P.S.  My favored quote from Internet:  Stupidity is a cosmic force!


From [e-mail] Tue Dec 03 19:55:53 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Amplifier Plan Books
Date: 25 Nov 1996 15:43:24 GMT
Organization: Internet (Bermuda) Limited
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: dial14-28.ibl.bm

I would like to learn more about building RF transistor amplifiers. I
cannot find any good literature around here. Can anyone recommend an
information source for transistor amplifier building? I am particularly
interested in building an amplifier using the 2SC2879. Any feedback would
be appreciated.


From [e-mail] Tue Dec 03 19:55:54 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-fw-22.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!hunter.premier.net!phase2.worldnet.att.net!netnews.worldnet.att.net!newsadm
From: "1" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: TH-79A(D) 800Mhz
Date: 25 Nov 1996 16:34:08 GMT
Organization: AT&T WorldNet Services
Lines: 19
Message-ID: <01bbdaed$d2e44460$fe7174cf@default>
References: <01bbda7a$b8a7ca90$0a66f0c6@general>
NNTP-Posting-Host: 207.116.113.254
X-Newsreader: Microsoft Internet News 4.70.1155
Xref: news1.epix.net rec.radio.amateur.equipment:43014 rec.radio.amateur.homebrew:21402 rec.radio.amateur.misc:118847

LOOK AT THE SCHEMATICS THAT CAME WITH THE RADIO.  A  LEGEND BOX LISTS WHAT
PARTS CAME WITH THE NON US VERSIONS.

CJ Lagos <[e-mail]> wrote in article
<01bbda7a$b8a7ca90$0a66f0c6@general>...
>       Recently, A message was posted about the TH-79A(D) and 800Mhz.  One
person
> said that 9 UHF parts were missing from the radio and that they were
worth
> about $14.00.  I have not been able to contact him via e-mail due to a
> problem with Worldnet's mail server.  Can anyone tell me which parts they
> are, where to get them etc ...?
>
>       I was always under the impression that the radio's logic prevented
> reception not the actual parts on-board.
>
>                                                                       Thanks again,
>                                                                               CJ <[e-mail]>
>


From [e-mail] Tue Dec 03 19:55:55 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!snunews.snu.ac.kr!newsfeed.dacom.co.kr!usenet.dacom.co.kr!news.postech.ac.kr!usenet.kornet.nm.kr!howland.erols.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!phase2.worldnet.att.net!uunet!in1.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Mon, 25 Nov 1996 10:01:36 -0700
Organization: Internet Access of Ventura County
Lines: 66
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port34.vcnet.com
Mime-Version: 1.0
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In article <[e-mail]>, [e-mail]
wrote:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
>
> > With average-gain 3-500Zs, putting a VHF-dampening device in either the
> >input or output circuit may produce stability.  However with
> above-average
> >gain 3-500Zs, using a VHF-dampening device in both the input and in the
> >output is indicated.
>
> This comment puzzles me Rich.
>
> You attribute a wide gain variation to tube differences, indicting it is
> an input to output feedback loop.

  Gain-variation has nothing to do with feedback capacitance.   Perhaps
this will decrease your level puzzlement, Tom:  The SB-220 has a VHF
resonance in the input and a VHF resoance in the output.  Both resonances
happen to be around 110MHz.  Approximately 0.2pF of capacitance exists
between the input and the output.  At 110MHz, 0.2pF has 8000 ohms of
reactance.  I believe that occasional oscillations at 110MHz can occur in
the SB-220.  The TL-922 has a similar problem at 140MHz, for the same
reason.  //  According to the notes from our telephone conversation in
1990, you stated that you had worked on over 400 SB-220s, and that many of
them had VHF parasitic-oscillation damage.   Are you now saying that VLF is
what you meant to say?


> The worse engineering mistake in the  SB-220 was the inclusion of chokes
> in paralle with capacitors from the grids to ground in the SB-220. It
> makes that PA subject to VLF parasitics, and destroys gain flatness. It
> makes the tubes less stable at VHF also. The single most important mod to
> an SB-220 is to ground the grids right at the tube pins with very very
> short leads.
>
Tom:  What is the grid-resonant frequency in a SB-220 with the
factory-stock grid circuitry?

Tom:  What is the grid-resonant frequency in a SB-220 with "very very short
leads" to ground the grids?

Tom:  What is the frequency of the anode circuit resonance in an AL-80...?

Tom:  Who is the anonymous Mr. XXX?  Why does he list a ficticious Eimac
e-mail address?.

Tom:   Who are/is "they"?.

Tom:   What are the names of the people at Eimac, to whom you refer to as
"it's the
entire staff",  who allegedly say that Mr. Foote and I are wrong about
gold-sputtering being caused by an oscillation condition?

Tom:   Does the AL-1500 8877 amplifier, which you designed, use a VHF parasiti
c
oscillation suppressor?

 Tom:  You proposed calculating the L/R VHF current-distribution for a typical
3-500Z suppressor.  I calculated the VHF current-distribution, and posted
the results here.  Would you prefer to drop this matter?
----------------------------------
e-mail copy to Mr. Rauch

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:55:56 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!world6.bellatlantic.net!IConNet!news.inc.net!newspump.sol.net!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: roller inductor where ?
Date: 25 Nov 1996 17:25:34 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>>
>While it is true that relatively high currents circulate in the shorted
>turns at settings of roughly 80% to 95% of Lmax, the alternative is far
>more consequential--i.e., arcing at the unshorted end when settings of 5%
>to 20% of Lmax are used.  My own preference is to short the unused turns
>with 1uH of L air-wound from #12 solid copper wire.  This prevents the
>tesla coil v buildup, and it limits the current that circulates in the
>shorted turns.

I go along with that completely. It is NOT a good idea to float the unused
turns. Unwanted series resonances cause much more problem than the shorted
turns. Flux leakage is so high in a conventional roller (the length is
often well over twice the diameter and turn to turn spacing can be wide)
that circulating currents are a minor problem. The idea of using a
reactive path seems to be a good one.

73 Tom


From [e-mail] Tue Dec 03 19:55:58 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.fibr.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CHIMNEY FOR 4CX-10,000
Date: Mon, 25 Nov 1996 14:43:50 -0700
Organization: Internet Access of Ventura County
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: port30.vcnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
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X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <[e-mail]>, Arthur Garabedian
<[e-mail]> wrote:

> I am looking for a chimney or phenolic material to make one for a
> 4CX-10,000 tube transmitter. Tube needs to be about 6" dia. 2" long.
> Thanks,  ARTHUR  KC6KUK  ANAHEIM,  CA. . .

the Eimac SK-1306 chimney is made from fiberglass.  It is about 7 inches in
diameter.  You can buy one from Richardson Electronics in Chicago.  They
are not all that expensive. //   I have a quantity of Eimac long-finger
stock for afixing an anode HF contactor to the top a fiberglas chimney.  If
you need some, say so.  Such an arrangement results in much less L in the
neutralization circuitry.  You can find an illustration of this techniqueon
the Web.  The URL is
http://www.vcnet.com/measures/
see Figure 11
-----------------------
e-mail copy to Arthur Garabedian

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:55:58 1996
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From: [e-mail] (Ed Burress)
Newsgroups: rec.radio.amateur.homebrew
Subject: Anyone built their own UHF duplexer?
Date: 25 Nov 1996 14:03:47 -0800
Organization: Tektronix, Inc., Wilsonville,  OR.
Lines: 14
Distribution: usa
Message-ID: <[e-mail]>
NNTP-Posting-Host: sepia.wv.tek.com

I ran across the plans recently in the ARRL Antenna book for
building your own duplexer for the 2 meter band.  I was
wondering if anyone has similar plans or pointers to design
formulas, plans, etc. for the 70 cm band?
I have access to a machine shop, and would like the chalenge
of "rolling my own".  Another question I had was to find out
if anyone has experience with using aluminum for the cavity
walls instead of copper?  Would this lead to temperature
instability, or greater insertion loss?  Any references would
be appreciated.

Thanks,
Ed Burress
KC7GFX


From [e-mail] Tue Dec 03 19:55:59 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Mon, 25 Nov 1996 16:03:37 -0700
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In article <[e-mail]>, [e-mail]
wrote:

> You allude to Vectronics using your suppressor, yet you failed to mention
> after they installed your suppression system field service history did not
> improve. Your suppression kit was removed from the Vectronics PA's within
> several months of the initial test.
>
Vectronics built LA30 amplifiers for AEA.  The field service was done by
AEA---and, in November of 1991, AEA began retrofitting low VHF-Q parasitic
suppressors into LA30 amplifiers that were returned because of
parasitic-related damage.  I have the sales records if you would like to
see them, Mr. Rauch.  Mr. Al Chandler was the person I delt with at AEA.
As i recall, Vectronics recommended that Chandler contact me about
retrofitting lower Q suppressors into LA30 amplifiers that were returned
for service.  .

Tom:  who said that low Q suppressors were removed from Vectronics'
amplifiers within several months of the initial test?  I provided the names
of the people I spoke with at Vectronics: engineer Jim Riach and owner Paul
Rivnak.  Who did you talk to at Vectronics?

It seems a bit curious that you would be skeptical about the glass envelope
melting problem at Vectronics.  I spoke to both the owner and the engineer
about this problem, as well as to Rus Healy at QST.  It also seems a bit
curious that Raich and Rivnak would conclude that higher VHF-Q suppressors
were better than lower VHF-Q suppressors if they recommended that AEA
contact me about retrofitting lower VHF-Q suppressors into LA30s that were
already in the field.

Tom:  Have you posted your mathematical solution to the following, yet?

 Tom: Are you suggesting that the primary path of VHF current is through
the paralleled 50 ohm resistor?  If you maintain that most of the VHF
current passes through the 50 ohm resistor, Tom, please show us the
mathematical solution that led you to your conclusion.
------------------------------------------------------------------
e-mail copies to Mr. Rauch, and the Good Source...... e-mailing list

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:56:00 1996
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From: miker <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone built their own UHF duplexer?
Date: Mon, 25 Nov 1996 17:26:46 -0800
Organization: Hevanet Communications
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To: Ed Burress <[e-mail]>

Ed Burress wrote:
>
> I ran across the plans recently in the ARRL Antenna book for
> building your own duplexer for the 2 meter band.  I was
> wondering if anyone has similar plans or pointers to design
> formulas, plans, etc. for the 70 cm band?
> I have access to a machine shop, and would like the chalenge
> of "rolling my own".  Another question I had was to find out
> if anyone has experience with using aluminum for the cavity
> walls instead of copper?  Would this lead to temperature
> instability, or greater insertion loss?  Any references would
> be appreciated.
>
> Thanks,
> Ed Burress
> KC7GFX
Hi ED.
I made my own aluminum 440 duplexers.  1.5" square aluminum tubing with
copper pipe center conductor.  Use 'em in the house, so no experience
with what happens outside.
miker


From [e-mail] Tue Dec 03 19:56:02 1996
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From: "Mark Bryant" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: 26 Nov 1996 02:05:51 GMT
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Have you ever gotten a nasty letter from an Irishman or black? And I and B
don't pretend that they know everything.

M


> Why is it that when you tell a 'joke' about an Irishman it is called
> tasteless; when you tell a joke about a black it is called racist, and
> when you tell a joke about a lawyer it is called funny?
>
> hmmmm
>
> cdn
>
>
>


From [e-mail] Tue Dec 03 19:56:03 1996
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From: "CJ Lagos" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: TH-79A(D) 800Mhz
Date: 26 Nov 1996 03:00:20 GMT
Organization: Erol's Internet Services
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So your saying TH-79E recieves 800Mhz?

1 <[e-mail]> wrote in article
<01bbdaed$d2e44460$fe7174cf@default>...
> LOOK AT THE SCHEMATICS THAT CAME WITH THE RADIO.  A  LEGEND BOX LISTS
WHAT
> PARTS CAME WITH THE NON US VERSIONS.
>
> CJ Lagos <[e-mail]> wrote in article
> <01bbda7a$b8a7ca90$0a66f0c6@general>...
> >     Recently, A message was posted about the TH-79A(D) and 800Mhz.  One
> person
> > said that 9 UHF parts were missing from the radio and that they were
> worth
> > about $14.00.  I have not been able to contact him via e-mail due to a
> > problem with Worldnet's mail server.  Can anyone tell me which parts
they
> > are, where to get them etc ...?
> >
> >     I was always under the impression that the radio's logic prevented
> > reception not the actual parts on-board.
> >
> >                                                                     Thanks again,
> >                                                                             CJ <[e-mail]>
> >
>


From [e-mail] Tue Dec 03 19:56:04 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amplifiers & NASA
Date: 26 Nov 96 04:45:46 GMT
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Rich is surely correct that Challenger shouldn't have been launched.  My
point, though, was that  NASA did not have pictures of 10 previous
launches in which fire could be seen -- and was seen -- shooting out the
booster rocket's side.  That suggests real recklessness.  The truth is
less melodramatic.

Anyway, Richard Feynman's account can be found in his book "What Do You
Care What Other People Think?"  A sociologist recently published a book
under the title "The Challenger Launch Decision."  It handles questions
such as Rich raised, but comes  to different conclusions.

In another collection of Feynman's writings, "Surely You're Joking, Mr.
Feynman," there's a great chapter called "He Fixes Radios By Thinking,"
which deals with, as I recall, amplifier tubes.  I think anyone on this
list would love it.  Anyway, fixing radios by thinking is what you guys
do, while I watch, so have at it.

                                                          Dave


From [e-mail] Tue Dec 03 19:56:05 1996
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From: "Dennis L. Edinger" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: W  Heath HP-20 Schematic
Date: Mon, 25 Nov 1996 21:36:58 -0800
Organization: Rocky Mountain Internet Inc.
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I need a schematic for a Heath HP-20 power supply.  Please e-mail me at
[e-mail] for arrangements, or I am good in the QRZ
database.

de Dennis/w0gd


From [e-mail] Tue Dec 03 19:56:06 1996
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From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KISS complex math
Date: Tue, 26 Nov 1996 06:40:59 LOCAL
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In article <[e-mail]> [e-mail] (Marijan Miletic) writ
es:
>From: [e-mail] (Marijan Miletic)
>Subject: KISS complex math
>Date: 26 Nov 96 17:26:17 GMT

>I don't remember seeing any exact mathematical calculation for QRO supressors
>but I do remember the following rules of complex algebra involved in R/L case
.
>Let's take R=50 Ohms and L with reactance of 67 Ohms and apply 200 Volts RF.
>R current will be 4A and L will carry 3A.  Total current will NOT be 7A but
>square root of the sum of Ir**2 + Il**2 which equals 5A because of 90 degrees
>phase angle.  Now we can calculate percentages in AG6K fashion...
>But I guess this kind of math in USA might be understand by Oriental students
>only while all the others are watching Dow Jones shooting over 7000 mark :-)
>I also noticed that Jesse, W6KKT is equal distance from L.A. & Hollywood...
>73 de Mario, S56A, N1YU.

Now Now, Mario

After reading about these "ratios" for days, I too brought this up when I
pointed out to Rich that "this ain't DC".

Of course, I was not as succinct as you.  I was preferring to, as is said in
the literature, leave the solution to the reader <g>.

73, Wes   N7WS




From [e-mail] Tue Dec 03 19:56:08 1996
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From: [e-mail] (Sam Fant Jr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Peter Dahl
Date: Tue, 26 Nov 1996 11:32:24 GMT
Organization: PSS InterNet Services, Interneting Florida and beyond 904 253 7100
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Dan Bryden <[e-mail]> wrote:

>I've seen Peter Dahl's name listed several times in reference to
>supplying transformers for power amplifiers. Does anyone know where I
>can contact him for more info.  Dan

 PETER W. DAHL CO. AMATEUR RADIO TRANSFORMER LISTING AS OF 02/19/96.
TELE: [phone] 5869 WAYCROSS AVENUE EL PASO, TX 79924 FAX: (915)
751-0768. MODEL.


From [e-mail] Tue Dec 03 19:56:08 1996
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From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #529
Date: 26 Nov 96 13:01:36 GMT
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Keith E. Spainhour Worte:
>Subject: Amp help w/ 304tl
>
>Hi, I am looking for some help building an amplifier using a 304tl
>I already have a 3kv supply for the plate supply..........
>Grounded Grid?
  You can operate the 304TL grounded grid but for about 900 watts out
you will have to provide 200 watts drive. If you are still interested
I can dig the info out for you. It was published in a old Bill Orr
Radio Handbook. Can't remember which one.
73
Bill wa4lav



From [e-mail] Tue Dec 03 19:56:10 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amplifiers & NASA
Date: 26 Nov 1996 14:40:37 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
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In article <[e-mail]>,
[e-mail] writes:
>
>Anyway, Richard Feynman's account can be found in his book "What Do You
>Care What Other People Think?"  A sociologist recently published a book
>under the title "The Challenger Launch Decision."  It handles questions
>such as Rich raised, but comes  to different conclusions.

I think Rich is tryng to say organizations lie and try to cover things up.

But organizations don't lie, only the people in them do. This applies to
individuals acting alone more than organizations, however. Organizations
have checks and balances that prevent this from going on forever.

An organization that doesn't understand their business goes out of
business, partially because they waste time and money correcting
non-problems. When they finally realize the truth, it is often too late.
So it is a self-eliminating problem. Companies that don't know what they
are doing, or lie to customers or themselves, die. Companies that are
technically strong and honest survive.

Some people lie to themselves, especially when they have a public offering
that brings them fame and notoriety. This is pretty common in electronics,
a wild theory with no technical merit gets published due to lack of
technical review, and it becomes accepted as fact. Eventually, the theory
goes so far astray that it falls apart.

Despite mounds of evidence to the contrary, a few people remain believers.
Almost like a techno-religion. Most of this occurs in antennas, where
circuit theory is difficult to apply and the effect of accelerating
charges rippling through the universe at light speed is almost "magical".
The only other area of our hobby where it obviously occurs is power
amplifiers.

The trend I notice is techno-folklore exists only when the general
population is interested in something that is poorly explained. They want
to learn, and look for simple answers. The fellow that can give one single
answer that applies to any situation is often followed, because even if he
is dead wrong....  he is easy to understand.

I see this in my other hobby, automobiles. These wild amplifier and
antenna theories are the equal of automotive folklore, such as putting a
wooden clothespin or a potatoe on a fuel line to prevent vapor lock.

Myself, I prefer facts when dealing with machines. I save my spiritual
side for personal thoughts, and not mystical techo-religious cures. I
think I've read enough of this self-contradicting parasite voodoo and the
supporting fabrications (passed off as fact) to last a lifetime.

73 Tom


From [e-mail] Tue Dec 03 19:56:11 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amplifiers & NASA
Date: Tue, 26 Nov 1996 08:07:26 -0700
Organization: Internet Access of Ventura County
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In article <[e-mail]>,
[e-mail] wrote:

> Rich is surely correct that Challenger shouldn't have been launched.  My
> point, though, was that  NASA did not have pictures of 10 previous
> launches in which fire could be seen -- and was seen -- shooting out the
> booster rocket's side.  That suggests real recklessness.  The truth is
> less melodramatic.

Yeah, well when the ground shakes a little in Southern California, by the
time the story hits the East Coast media, the 'quake is awesome.  NBC might
have included three incidents of insignificant incidents of o-ring lakage
along with the seven serious ones.  In any event, NASA lied about whether
or not the astronauts survived the Challenger explosion.  NASA prevaricated
about the reason why they fired the two safety engineers.  The lone-holdout
from Morton Thiokol, who refused to sign-off on the launch---who was
overruled by his supervisor---told this story:  About 5 minutes before
launch, he was walking down a hallway when he spotted his supervisor
sitting in a room watching the countdown on a TV.  The supervisor spotted
the lone-holdout and invited him to stay and watch the launch.  The
supervisor informed the lone-holdout that he had just prayed for 20 minutes
to almighty God that the launch would be successful, so not to worry.  The
lone-holdout sat down beside his supervisor and they watched the launch.

> Anyway, Richard Feynman's account can be found in his book "What Do You
> Care What Other People Think?"  A sociologist recently published a book
> under the title "The Challenger Launch Decision."  It handles questions
> such as Rich raised, but comes  to different conclusions.
>
Hmmm.  So Mr. Feynman concludes that NASA was justified in firing (and
threatening) the two safety engineers who were trying to get the
booster-rocket o-ring problem fixed prior to Mission 25.

> In another collection of Feynman's writings, "Surely You're Joking, Mr.
> Feynman," there's a great chapter called "He Fixes Radios By Thinking,"
> which deals with, as I recall, amplifier tubes.  I think anyone on this
> list would love it.  Anyway, fixing radios by thinking is what you guys
> do, while I watch, so have at it.
>
Thinking is about half of what I do, Dave.  Over the years my 100w, 60w and
25w soldering irons have consumed a modicum of Weller replacement parts.
------------------------------------------
e-mail copy to Mr. Nordquist and the Good Source...... mailing list

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:56:12 1996
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From: [e-mail] (Clay Timmons)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for 60KHz WWVB receiver circuits
Date: 26 Nov 1996 15:57:29 GMT
Organization: Texas Instruments, Inc.
Lines: 29
Message-ID: <57f419$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: spud.asic.sc.ti.com


Howdy from Dallas Texas,

I'm an electronic hobbist working on an ultimate alarm
clock project.  I'm looking for any designs for 60KHz
WWVB recievers.  My clock currently uses a battery
backed clock chip for timekeeping but I would like
to upgrate it to use the WWVB signal instead.
I have built a WWV receiver but I find that the
signal fades to much from day to night.

I have seen the article a few years ago in 73 magazine.
Has anyone built this circuit?


Any ideas would be appreciated.


Later-

Clay Timmons     KB5SXS

[e-mail]








From [e-mail] Tue Dec 03 19:56:13 1996
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From: Philip Peake <[e-mail]>
Newsgroups: rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.ssb
Subject: Re: balancing tubes: how?
Date: Tue, 26 Nov 1996 07:57:55 -0800
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Clifford Buttschardt wrote:
>
> What is the better way of balancing tubes such as 3-500Z units?  Is is
> better to balance the standing current for a given bias (zero bias in the
> 3-500 units of course) or should the plate current be measured at a give
> RF drive for each tube?  One measures the mu of the tube while the second
> approach measures the transconductance.  Which is more practical for hams?

Set the standing current (no drive) in each tube to be the
same (adjust bias). Apply drive, and adjust the drive level(s)
to each tube to get the same plate current.

If you are really pedantic, now try halving the drive. If there
is a large difference in plate current, replace the lower reading
tube.

Philip


From [e-mail] Tue Dec 03 19:56:14 1996
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From: [e-mail] (Jack Taylor)
Newsgroups: rec.radio.amateur.homebrew
Subject: tube data/mil gear web site
Date: 26 Nov 96 16:20:53 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <12403@NJ7P>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Bill, NJ7P has been extensively upgrading his web site with tube data
and military equipment info, including schematics for some of the mil
gear.  The site features search engines to quickly determine whether the
desired info for a specific tube or mil gear nomenclature exists.

Check it out at:  http://linux.hqisec.army.mil

73 de Jack




From [e-mail] Tue Dec 03 19:56:17 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: 26 Nov 1996 16:27:10 GMT
Organization: InternetU, Inc.
Lines: 21
Message-ID: <57f5ou$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]> <[e-mail]>
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In <[e-mail]>, [e-mail] (CDN) writes:
>when you tell a joke about a lawyer it is called funny?
>hmmmm
>cdn

because a number of high-profile members of the profession diligently slave
to become the ambulance-chaser stereotype that is the root of the gags.

all you gotta do is listen to the radio and tv ads.

one radio station personality locally commented once that for the money the
law firm was paying for the spot, and for the production cost of the spot, the

cost of a professional voice talent would have been peanuts and would
enhance their appearance and remove some of the "used car salesman" image
the founder projects...

Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
Melbourne, FL                       duty now for the future of amateur radio
Lombardi's 1st Law of Business:
   Companies succeed in spite of their best effort.  If they succeed at all.



From [e-mail] Tue Dec 03 19:56:18 1996
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From: Steve C <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Anyone built DJ9BV long yagis ??
Date: Tue, 26 Nov 1996 16:34:46 +0000
Organization: Moi
Lines: 15
Distribution: world
Message-ID: <[e-mail]>
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Hi,

I plan to build some DJ9BV long yagis for 144 and 432MHz.

Anyone built some, and have any useful dos and don'ts ?

I plan to use 50R coax rather than the open wire feed, and want to go
for a matching balun like the Eagle Antennas version.

Also, I did see somewhere an address for the insulating rivets in the
UK, anyone know this ??

Thanks
--
Steve C


From [e-mail] Tue Dec 03 19:56:19 1996
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From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Audio Compander, Mic preamp and improved Audio
Date: 26 Nov 1996 16:56:32 GMT
Organization: IT
Lines: 24
Message-ID: <57f7g1$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 128.163.120.82
X-Newsreader: WinVN 0.92.6

In article <[e-mail]>, [e-mail] (David Seeler) says
:
>
>Hi _ I am in the process of building a mike preamp/equalizer that
>was described in the Feb 1986 issue of CQ Magazine.  The circuit
>uses a Signetics NE580 (or 570?) audio compander to maintain
>constant audio input through the circuit.
>
>Does anyone know of a source ( Canadian or US) that has This
>(these) chip(s)  and is willing to ship in small numbers? I have
>so far been unable to find a Canadian distributer.  Philips has
>taken over Signetics, but I can get no information about their
>availability  from the Canadian office.
>
>Thanks for any pointers you might be able to give me!
>
>
>
>Regards,
>David Seeler, VY2DCS
Try to cross reference it in a ECG "transistor" substitution handbook.
I think the refference is ECG-101.  The diagram I am have has the top
"sliced" off and it could be 101, 107, 701, or even 707.  I will try
to get a better number for you.
Terry


From [e-mail] Tue Dec 03 19:56:20 1996
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From: [e-mail] (Marijan Miletic)
Newsgroups: rec.radio.amateur.homebrew
Subject: KISS complex math
Date: 26 Nov 96 17:26:17 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I don't remember seeing any exact mathematical calculation for QRO supressors
but I do remember the following rules of complex algebra involved in R/L case.
Let's take R=50 Ohms and L with reactance of 67 Ohms and apply 200 Volts RF.
R current will be 4A and L will carry 3A.  Total current will NOT be 7A but
square root of the sum of Ir**2 + Il**2 which equals 5A because of 90 degrees
phase angle.  Now we can calculate percentages in AG6K fashion...
But I guess this kind of math in USA might be understand by Oriental students
only while all the others are watching Dow Jones shooting over 7000 mark :-)
I also noticed that Jesse, W6KKT is equal distance from L.A. & Hollywood...
73 de Mario, S56A, N1YU.


From [e-mail] Tue Dec 03 19:56:21 1996
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From: [e-mail] (Terry Simonds)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for 60KHz WWVB receiver circuits
Date: Tue, 26 Nov 1996 17:45:46 GMT
Organization: Icanect
Lines: 38
Message-ID: <57faap$[e-mail]>
References: <57f419$[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Clay Timmons) wrote:


->Howdy from Dallas Texas,

->I'm an electronic hobbist working on an ultimate alarm
->clock project.  I'm looking for any designs for 60KHz
->WWVB recievers.  My clock currently uses a battery
->backed clock chip for timekeeping but I would like
->to upgrate it to use the WWVB signal instead.
->I have built a WWV receiver but I find that the
->signal fades to much from day to night.

->I have seen the article a few years ago in 73 magazine.
->Has anyone built this circuit?


->Any ideas would be appreciated.


->Later-

->Clay Timmons     KB5SXS

->[e-mail]

->


Didn't Heathkit make a clock controlled from WWV/WWVB? Maybe someone
has the schematic




73--Terry/WB4FXD in Ft. Lauderdale, FL
[e-mail]



From [e-mail] Tue Dec 03 19:56:25 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!uunet!in2.uu.net!hunter.premier.net!feed1.news.erols.com!howland.erols.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: KISS
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Tue, 26 Nov 1996 19:13:16 GMT
Lines: 53

In article <[e-mail]> [e-mail] writes:
>I am sure KE4ZV supports KISS approach and if we can explain arcing with simp
le
>model of light load on working frequency, lets refrain from mumbo-jumbo of UF
O
>effects in a good tradition of an engineering practice.  Catastrophic failure
s
>are beyond a reasonable price/performance design and are usually covered by
>insurance or guarantee.
>73 de Mario, S56A, N1YU.

I agree that Occam's Razor is usually the best course. Certainly a lot
of reported arcing problems are the result of inadvertent light loading.
But I'm not convinced we can blame all arcs on that. I think we can count
on a gassy tube arcing too, and I wouldn't be surprised if VHF oscillations
might not cause problems in some cases as well. (If there were no chance
of that, no amplifier would have VHF suppressors.) So I think that some
protection is warranted if it can save some expensive parts in the event
of a fault, whatever the cause.

I do think that many of Rich's proposed mechanisms are highly implausible.
OTOH, Tom's rather cavalier explanations don't wash either. Amplifiers *can*
break into oscillation. As Chris Bowick says, "The easiest way to make an
oscillator is to try to build an amplifier." Many oscillators *are* hard
to start, and may only oscillate sporadically. Unless you test under
*exactly* the right conditions, you may not realize you have an oscillator
until someone experiences the condition in the field. (Most FEBs are
issued when a customer finds a problem in the field and engineering has
to come up with a fix.)

I have come to the conclusion that Rich's nichrome inductors don't
do anything useful at VHF. The shunt R lowers the Q nicely at VHF
without adding any series resistance to the inductor. All that does
is introduce extra loss at HF. In some cases that might be useful
if the parasitic is *also* at HF (unlikely with a GG amp, but more
plausible with a common cathode circuit, though ordinary neutralization
or unilateralization are better ways to deal with that), but otherwise
it just lowers amplifier tank Q to no good result.

If tank Q is too high, that's a design or operational problem, and
needs to be addressed directly rather than being bandaided. I am a
very strong believer in addressing real problems and deplore the idea
of using bandaids to merely mask symptoms of an underlying defect.
OTOH, things fail, and operators make mistakes. Design features
which mitigate the impact of failures or operator errors make sense
if they potentially save more money than they cost. (You wouldn't
leave emergency brakes off a car under the assumption that insurance
will cover the damage when the driver crashes due to lack of backup
when the main brakes fail would you?)

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Dec 03 19:56:26 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Inexpensive but reliable frequency counter?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Tue, 26 Nov 1996 19:51:59 GMT
Lines: 52

In article <[e-mail]> [e-mail]
AND.EDU (J. Keith Ostertag) writes:
>I'm a new ham and a would-be electronics experimenter (no technical
>background). One item I would like to own is a frequency counter, but I don't
>feel I can justify $300-$400 for a bench model. So I have been looking around
>for a kit or some plans to build one myself. There's one in the latest ARRL
>Handbook (6-digit, 50MHz) which can be bought as a kit for $79 from Radio
>Adventures. I also found two plans in Popular Electronics, a 25MHz 4-digit
>model in the Feb 1995 issue and a 50MHz model in the Nov 1994 issue.
>
>Does anyone have direct experience with any of the above? Or maybe someone ca
n
>offer an alternative? For instance, might it be better for me to buy one
>of those $200 radio frequency counters made by Startek or MFJ?

Buy the Radio Shack counter if you must have a counter. It is surprisingly
good considering the source (better than MFJ). It's a lot handier than the
kits, has more resolution, and covers a wider frequency range too. One big
plus of the RS counter over the Startek is that the RS counter is relatively
deaf. That means you can use it without it trying to read every radio station
in the county. You really have to couple it to what you want to measure (and
that's good because it means you won't be measuring something else and not
know it).

IMHO, a counter is a lot less useful than it may at first appear.
Counters only give reliable readings when fed pure sinewaves.
They will often lock to a harmonic or subharmonic of a typical
complex signal. *AND YOU WON'T KNOW THAT.* I'd much rather have
a scope, even a relatively cheap import scope, than to have a
counter. Of course having both is better.

There are two instruments I consider priority purchases for the
electronics experimenter. Those are an *analog* VOM and a scope.
Later you can add a DVM, a capacitance checker, a dipmeter, a
signal generator, a spectrum analyzer, a communications monitor,
a counter, etc. Often the best piece of RF test equipment you can
have is a good quality transceiver. It can serve as signal generator
and communications monitor, and negates the need for a counter in
most cases.

DVMs can be almost as devious as a counter. A good old analog VOM
can be much more useful because you can spot trending in the readings.
That can often tell you a lot more than the dancing digits of a DVM.
It also makes checking electrolytic capacitor leakage and transistor
junction leakage easy. IMHO, transistor checkers are mostly frills, a
VOM will serve. OTOH, I really like capacitance checkers because they
can read small value capacitors and a VOM can't.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Dec 03 19:56:27 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!panix!feed1.news.erols.com!news.dra.com!news.starnet.net!news
From: mckinne <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: pat bunn oner kits..info
Date: Tue, 26 Nov 1996 14:17:47 -0600
Organization: Fontbonne College
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: gatekeeper.fontbonne.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.0 (Win16; I)

pat my e mail had incomplete mail adress for you....
interested in oner kit...where is story of one er to see what it is
[e-mail]


From [e-mail] Tue Dec 03 19:56:28 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!iag.net!news.magicnet.net!feed1.news.erols.com!news
From: Jake Brodsky <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for 60KHz WWVB receiver circuits
Date: Tue, 26 Nov 1996 15:53:11 -0500
Organization: Utter Chaos
Lines: 17
Message-ID: <[e-mail]>
References: <57f419$[e-mail]> <57faap$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: spg-as58s26.erols.com
Mime-Version: 1.0
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X-Mailer: Mozilla 3.0 (WinNT; I)

Terry Simonds wrote:
>
> Didn't Heathkit make a clock controlled from WWV/WWVB? Maybe someone
> has the schematic
>

yeah.  We use them here at work.  The receiver in them sucks so badly
that it can draw a substantial vacuum ;-)

It is mostly a bunch of tone detectors and a cheap uP.  I wouldn't
bother with it if I were you.


Jake Brodsky, mailto:[e-mail]
PP-ASEL IA, Cessna Cardinal N30946, Based @ MD24
Amateur Radio Station AB3A
"Beware of the massive impossible!"


From [e-mail] Tue Dec 03 19:56:29 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!swrinde!ihnp4.ucsd.edu!news.cerf.net!hacgate2.hac.com!news.delcoelect.com!usenet
From: REMAPC05@
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FS: HV PS Diodes
Date: 26 Nov 1996 21:53:56 GMT
Organization: Delco Electronics Corp.
Lines: 7
Distribution: usa
Message-ID: <57fotk$[e-mail]>
References: <572h01$[e-mail]>
Reply-To: REMAPC05@
NNTP-Posting-Host: remapc05.rey.delcoelect.com
X-Newsreader: IBM NewsReader/2 v1.2

In <572h01$[e-mail]>, [e-mail] (Spencer Petri) writes:
>These are 25KV diodes and I did a test run of 1.2Amps at 4 hours.
>Perfect for that big amp.  $10 each or 4 for $35 + $3 postage.
>
>73 de Pete  WA5JCI
>



From [e-mail] Tue Dec 03 19:56:31 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!swrinde!ihnp4.ucsd.edu!news.cerf.net!hacgate2.hac.com!news.delcoelect.com!usenet
From: REMAPC05@
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FS: HV PS Diodes
Date: 26 Nov 1996 22:04:54 GMT
Organization: Delco Electronics Corp.
Lines: 13
Distribution: usa
Message-ID: <57fpi6$[e-mail]>
References: <572h01$[e-mail]>
Reply-To: REMAPC05@
NNTP-Posting-Host: remapc05.rey.delcoelect.com
X-Newsreader: IBM NewsReader/2 v1.2

In <572h01$[e-mail]>, [e-mail] (Spencer Petri) writes:
>These are 25KV diodes and I did a test run of 1.2Amps at 4 hours.
>Perfect for that big amp.  $10 each or 4 for $35 + $3 postage.
>
>73 de Pete  WA5JCI
>
How do they mount?  How do they connect? What is the general form or shape?
What are approximate dimensions? Who is the manufacturer? Any way to find
out the maximum manufacturer's rated current? Enough questions? I thought so!

73,

Roy    K9ER


From [e-mail] Tue Dec 03 19:56:32 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Tue, 26 Nov 1996 15:35:11 -0700
Organization: Internet Access of Ventura County
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port23.vcnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
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In article <[e-mail]>, [e-mail]
wrote:

> Rich,  I think you overlooked this post.
>
> You arbitrarily assigned a value of 50 ohms to the resistor, and .070 uH
> to the inductor. The AL-80 series uses a 100 ohm resistor, not 50. The
> inductance of later units was indeed reduced to ~85 nH,
...snip...
What is the anode resonant frequency in the AL80?  You find this with a
dipmeter coupled to either side of the dc blocking capacitor.  I can not
calculate the current distribution without knowing the frequency of the
anode resonance.  If you do not have access to a dipmeter and an AL80,
please let me know and I will call around and see if I can find someone who
does.
>
> Your calculations are exact for the values "pulled from your hat", but the
> actual shift in current varies with the actual supperssor.

The values of L and R is the actual values we use in the SB-220, TL-922,
2K-4, and similar 2, 3-500Z amplifiers which use a 3000v anode supply.

> A second factor enters the equation, and this is the critical area. Adding
> nichrome to the primary HF path does almost NOTHING to system Q.
...snip...

First things first.   I need to calculate the current distribution for 85nH
and 100 ohms, but I can not do it until someone uses a dipmeter and
measures the anode resonant frequency in the amplifier that this suppressor
is used in.
--------------------------
e-mail copies to Mr. Rauch and the Good Source...... mailing list.

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:56:33 1996
Message-ID: <[e-mail]>
Date: Tue, 26 Nov 1996 15:10:51 -0800
From: Tim Johnston - KF4FTP <[e-mail]>
Reply-To: [e-mail]
Organization: Hapco, Division of Kearney Nat'l
X-Mailer: Mozilla 3.0 (Win16; I)
MIME-Version: 1.0
Subject: Gamma Match
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Newsgroups: rec.radio.amateur.homebrew
Lines: 11
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!mindspring!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!netaccess.naxs.com

I am a fairly new ham (ticket in Jan 96) and have a question about a
gamma match ... what is it?  I was listening in to a technical
roundtable the other nite about building an HF antenna and feeding it
with a gamma match, and was afraid to show my ignorance.

Tnx!
--
Tim Johnston, KF4FTP
E-mail:  mailto:[e-mail] -or- mailto:[e-mail]
Web: http://www.hapcopoles.com


From [e-mail] Tue Dec 03 19:56:36 1996
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From: "Cliff Soderback" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone built their own UHF duplexer?
Date: 26 Nov 1996 23:24:09 GMT
Organization: AT&T WorldNet Services
Lines: 42
Message-ID: <01bbdbf0$1edf3840$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 207.147.120.71
X-Newsreader: Microsoft Internet News 4.70.1155



Ed Burress <[e-mail]> wrote in article
<[e-mail]>...
> I ran across the plans recently in the ARRL Antenna book for
> building your own duplexer for the 2 meter band.  I was
> wondering if anyone has similar plans or pointers to design
> formulas, plans, etc. for the 70 cm band?
> I have access to a machine shop, and would like the chalenge
> of "rolling my own".  Another question I had was to find out
> if anyone has experience with using aluminum for the cavity
> walls instead of copper?  Would this lead to temperature
> instability, or greater insertion loss?  Any references would
> be appreciated.
>
> Thanks,
> Ed Burress
> KC7GFX
>
    Ed:
              Several commercial brands are made from Alum. tubing.
Sinclair makes
one from a square Alum. extrusion. The fabrication is not complicated. The
real trick
is to match the coeffcient of thermal expansion between the center tuning
rod
and the expansion of the outer tube cavity. This is done by using metals
of different expansion rates. The goal is to not have the cavity change
freq.
tuning with temp. The easy way would be to borrow one and copy it. The
metal
which is used in the tuning rod is usually Iconal which is a high nickel
content
stainless steel. Motorola made some out of copper sheet pressed into a
square can
and a couple of small copper straps to tune it. Real cintzy, but they sold
a lot
of them for many years. The bad part is they are almost impossible to tune
properly.
A very poor design.

                                                        Cliff, W7VVA


From [e-mail] Tue Dec 03 19:56:37 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!news
From: [e-mail](Dan Walker)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Baycom as TNC ?
Date: 26 Nov 1996 23:34:03 GMT
Organization: Netcom
Lines: 16
Message-ID: <57fupb$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sdx-ca12-10.ix.netcom.com
X-NETCOM-Date: Tue Nov 26  3:34:03 PM PST 1996

In <[e-mail]> Gary Tait
<[e-mail]> writes:
>
>Does anybody know of any software so that I can use an PC-XT and a
>Baycom modem as a stand alone TNC?
>
>I would prefer something that will work directly off of a floppy
>disk (360 or 720 K, with system)
>
>Gary Tait , VE3VBF
>- Please do not quote US prices, they are no good to me ,here in
Canada -
>

You should be able to download BAYCOM from the web somewhere. I know
it's small enough to run on a 720K diskette.


From [e-mail] Tue Dec 03 19:56:40 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!snunews.snu.ac.kr!newsfeed.dacom.co.kr!usenet.kornet.nm.kr!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 27 Nov 1996 00:22:36 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 65
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>Tom:  Who is the anonymous Mr. XXX?  Why does he list a ficticious Eimac
>e-mail address?.
>
>Tom:   Who are/is "they"?.
>
>Tom:   What are the names of the people at Eimac, to whom you refer to as
>"it's the
>entire staff",  who allegedly say that Mr. Foote and I are wrong about
>gold-sputtering being caused by an oscillation condition?

Rich,

I tried to avoid this, because it would leave you no way out. I really
don't enjoy this, but I see no alternative. You've pushed too hard on this
issue and impugned my credibility with "stories", so you can have what you
demanded.

The former *R+D engineering manager*, Buzz Miklos, of the Salt Lake City
Varian plant has agreed to speak to one or two people on the telephone
about your theories. He said he will also come on line, but since he just
took a position as engineering manager with another tube manufacturer in
PA, it will be sometime in January before he is able to connect directly
to this newsgroup.

But if you want a quick answer, let's find someone to talk to Mr. Miklos.
A second person still at Varian Salt Lake, John Button, will confirm Mr.
Miklos' employment status with Varian, and the fact that Mr. Miklos was
indeed R+D engineering manager for Varian and a long term employee in
power grid tube design and research. Mr. Brandon will also conform Mr.
Miklos' qualifications. Incidentally, both Mr. Button and Reid disagree
with you completely also.

Mr. Miklos feels, and says his Eimac engineering staff felt, your theories
have no merit and display a complete misunderstanding of how a power grid
tube operates and the mechanisms of tube failures.

He prefers you not receive his phone number, since he understands you have
more time to argue than he does. He will, however, call you if you always
promise to include his views whenever you mention the person assigned to
answer customer letters, Mr. Foote.

You wanted to know who at Varian disagrees with you. You now have what you
have asked for...and perhaps more than you wanted.

Mr. Miklos said my interpretation of grid damage was correct, that the
8877 can only dissipate perhaps two times the rated dissipation (50 watts)
before grid damage occurs. He further stated a major cause of gold
sputtering is poor alignment between the grid and cathode bands in the
tube, or grid dissipations above the 35-50 watt range.

He also says, as I did,  gold migrates slowly on its' own accord from
normal electron bombardment. Excessive grid current speeds this process.
Excessive dissipation makes the gold migration fatal to the cathode in a
very short time.

Let's pick someone to call Mr. Miklos. He will confirm all of this, and as
much more as needed. Or we can drop all this parasitic nonsense and do
better things.

Your move.

73 Tom


From [e-mail] Tue Dec 03 19:56:41 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!browns
From: [e-mail] (Stephen B Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8 Hz lightning receiver ????
Date: 27 Nov 1996 00:50:20 GMT
Organization: The Ohio State University
Lines: 18
Message-ID: <57g38c$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: nimue.eng.ohio-state.edu

In article <[e-mail]>,
Bart Mudde <[e-mail]> wrote:
>Hello OM, who knows something about a receiver for lightning ?
>I was told, the activities can be monitored with a 8 Hz receiver, but is
>it possible to built something like that. It very very low ofcourse and
>is it true ?
>I am always very curious and interested in thunder etc. so when it is
>possible to built something please let me hear.
>73 es cuagn de Bart PA3GGM.

For a schematic of a 300 kHz receiver, go to
    http://www.wenzel.com/pages/mystrylb.htm
and grab the `Lightning detector'  (it's down at the bottom of the page.)

--
Steve Brown, N8HFI              [e-mail]
        http://er4www.eng.ohio-state.edu/~browns
Chief Engineer, The Ohio State University Radio Observatory ("Big Ear")


From [e-mail] Tue Dec 03 19:56:42 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!swrinde!ihnp4.ucsd.edu!info.ucla.edu!news.ucdavis.edu!indigo!mays
From: mays@indigo (Skip May)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Gamma Match
Date: 27 Nov 1996 01:32:37 GMT
Organization: University of California, Davis
Lines: 29
Message-ID: <57g5nl$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: indigo.ucdavis.edu
X-Newsreader: TIN [version 1.2 PL2]

: I am a fairly new ham (ticket in Jan 96) and have a question about a
: gamma match ... what is it?  I was listening in to a technical
: roundtable the other nite about building an HF antenna and feeding it
: with a gamma match, and was afraid to show my ignorance.
: Tnx!
: Tim Johnston, KF4FTP
: E-mail:  mailto:[e-mail] -or- mailto:[e-mail]

Tim,
The gamma match is a name for the physical hardware on an antenna used
to couple the energy/power that comes from your radio through the
coax (typical) to the antenna. The common example is the Aluminum
tube trombone type for beam antennas, but there are others.

The gamma can be considered a few different things at the same time,
matching the typical 50 ohm coax to the driven element of the beam
which has a different complex impedance (ac resistance), you could call
it a tuner and/or matching network.

Single band antennas have the classic trombone type design which are
frequency dependent. Typical Multi band antennas use a varity of designs
which are less frequency restricted and a slightly diff physical design.

Pick up an antenna book or some of the amateur catalogs, better yet an
ARRL Handbook has it all and it can prob be found at the local library.

73's
skip may  wv6f
[e-mail]


From [e-mail] Tue Dec 03 19:56:42 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More Amplifier Stuff
Date: 27 Nov 1996 01:44:46 GMT
Organization: AOL http://www.aol.com
Lines: 8
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

Anyone have information on building a homebrew 6 Meter amp (350-1000
watts).

with a input of atleast 10 watts?

Have been looking every where.

73


From [e-mail] Tue Dec 03 19:56:45 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!news.rio.com!news
From: "FUman" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: 27 Nov 1996 02:28:05 GMT
Organization: kg7fu
Lines: 25
Message-ID: <01bbdc0a$ff402c40$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]> <[e-mail]> <57f5ou$[e-mail]>
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> In <[e-mail]>, [e-mail] (CDN) writes:
> >when you tell a joke about a lawyer it is called funny?
> >hmmmm

Maybe the jokes aren't funny. But neither is what lawyers are helping
to do to our hobby, our country and our world.

People oftn use humor to release frustration and tension. The cost of
doing business with and the results of lawyers causes both. No wonder
there are so many lawyer jokes.

Perhaps if lawyers had a canon of ethics which kept them from taking
frivolous cases, charging exorbanant rates, raping those who win large
judgement sums, and taking or making action that hurt groups like
amateur radio they would have a some respect from the general public.

Of course, some lawyer will try and justify or nullify the above. That's
what they do.


de kg7fu
=20





From [e-mail] Tue Dec 03 19:56:46 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!feed1.news.erols.com!news.dra.com!news.he.net!night.primate.wisc.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Inexpensive but reliable frequency counter?
Date: 27 Nov 1996 02:58:08 GMT
Organization: Hewlett-Packard
Lines: 37
Message-ID: <57gao0$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: mentor23.scd.hp.com

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>>
>
>IMHO, a counter is a lot less useful than it may at first appear.
>Counters only give reliable readings when fed pure sinewaves.
>They will often lock to a harmonic or subharmonic of a typical
>complex signal. *AND YOU WON'T KNOW THAT.* I'd much rather have
>a scope, even a relatively cheap import scope, than to have a
>counter. Of course having both is better.
>--
>Gary Coffman KE4ZV          |    You make it,     | Due to provider problems

This depends on the counter.  For cheap "ham" type counters,
this is probably fairly accurate.  However, many "universal"
type counters, such as the HP 5334B*, have front ends and triggering
circuits that are practically the same as scopes.  I.E., you
can set triggering for positive slope or negative slope, and
set the trigger level as well.  There is also adjustable
hysteresis, and the input impedance can be selected to work
with a scope probe (1 Megohm input).  BTW, the optimum signal
to feed a universal counter is a square wave, not a sine wave.
This reduces jitter.

Above 100 MHz, most counters go to a prescaler mode, with
50 ohm input only, and no adjustable triggering.  However,
there are vast difference in performance between well designed
prescalers and cheap ones.  For example, the rather expensive
HP 5386 has a GaAsFET preamplifier and static divider IC.
The less expensive 5334B used Si MMIC preamplifiers and a
dynamic divider IC.  The 5386 is more tolerant of "funny"
signals and more tolerant of noise.

*(the author was the R&D project manager for the 5334B counter)

Rick Karlquist, N6RK
[e-mail]


From [e-mail] Tue Dec 03 19:56:47 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!news.primenet.com!markhome
From: [e-mail] (M. Monninger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone built their own UHF duplexer?
Date: 26 Nov 1996 22:06:03 -0700
Organization: None
Lines: 24
Message-ID: <57gi7r$[e-mail]>
References: <[e-mail]> <01bbdbf0$1edf3840$[e-mail]>
X-Posted-By: @206.165.20.219 (markem)
X-Newsreader: News Xpress 2.0 Beta #2


Ed Burress <[e-mail]> wrote in article
<[e-mail]>...
>> I ran across the plans recently in the ARRL Antenna book for
>> building your own duplexer for the 2 meter band.  I was
>> wondering if anyone has similar plans or pointers to design
>> formulas, plans, etc. for the 70 cm band?
>> I have access to a machine shop, and would like the chalenge
>> of "rolling my own".  Another question I had was to find out
>> if anyone has experience with using aluminum for the cavity
>> walls instead of copper?  Would this lead to temperature
>> instability, or greater insertion loss?  Any references would
>> be appreciated.
>>

I believe there were plans in either Ham Radio or QST several years ago to
build 70cm duplexers. I seem to remember they used PC board material.

Maybe someone else will know more precisely when and where the article ran.

Then again, I could be all wrong. They say the memory is the second thing to
go...

73...    Mark   AA7TA


From [e-mail] Tue Dec 03 19:56:48 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news-stock.gsl.net!news.gsl.net!news-peer.gsl.net!news.gsl.net!hunter.premier.net!feed1.news.erols.com!howland.erols.net!nntp.crl.com!nexp.crl.com!usenet
From: Dave Booth <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Hampage
Date: Tue, 26 Nov 1996 21:41:33 -0800
Organization: KC6WFS
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: 165.113.223.131
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (X11; U; IRIX 5.3 IP19)

Just updated my hamradio page. Lots of new stuff and a few questions.
Also got my 1967 Camaro SS/RS pics up in jpg format so they will load
with Netscape.

Check it out and enjoy!!!!
73
kc6wfs dm04rk
http://www.geocities.com/Hollywood/5860/

--
Dave Booth


From [e-mail] Tue Dec 03 19:56:49 1996
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From: [e-mail] (gudmundur)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amp help w/ 304tl
Date: 27 Nov 1996 06:25:24 GMT
Organization: silverlake stable
Lines: 50
Distribution: world
Message-ID: <57gmsk$rh0$[e-mail]>
References: <01bbdb17$ffcbd5e0$LocalHost@ks>
NNTP-Posting-Host: sl5.cyberia.com
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In article <01bbdb17$ffcbd5e0$LocalHost@ks>, [e-mail]
says...
>
>Hi, I am looking for some help building an amplifier using a 304tl
>I already have a 3kv supply for the plate supply. I have the specs on
>the tube from Eimac, they are
>                DC Plate            3000v
>                DC Grid              -400v
>                Plate Current     500ma
>                DC Grid Current   80ma
>
>                and so on
>
>I have numerous questions, like , what would be a good circuit for
this
>tube?
>Grounded Grid? What about an input circuit? What class would this be (
A,
>AB1, AB2)?
>I saw somewhere the formula for figuring plate load, but can't
remember
>where.
>I see alot of talk about parasitic suppressers, what would be the best
>circuit for this?
>I already have the basic hardware stuff started, I need some help on
the
>finer things!
>Any schematics, component values, comments or what ever  would be of
great
>help.
>I know very little about designing amplifiers and any help would be
>appreciated.
>I also have a 3-400z amperex with socket, would this be a better tube
for
>this project?
>anyone have the specs on this tube?
>
>73
>KT4XW
>Keith Spainhour
>[e-mail]
Remember one thing about the 304 TL, It is like 4   75TL tubes
in parrallel. So it has a much lower plate impeadance than most
other power tubes. It was designed for higher than expected plate
currents. Also the TL designation means it is the low gain version.
The high gain triodes provided about 10-13 db of gain, and the low
gain versions about half of that, or 5-6 db in the original circuits.
304's make great AM modulator tubes but I don't know about their
rf merit. Certainly many hams used them for rf anyway.



From [e-mail] Tue Dec 03 19:56:51 1996
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From: Tom <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Tue, 26 Nov 1996 22:50:15 -0800
Organization: The Internet Access Company, Inc.
Lines: 27
Message-ID: <[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]> <[e-mail]> <57f5ou$[e-mail]> <01bbdc0a$ff402c40$[e-mail]>
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FUman wrote:
>
> > In <[e-mail]>, [e-mail] (CDN) writes:
> > >when you tell a joke about a lawyer it is called funny?
> > >hmmmm
>
> Maybe the jokes aren't funny. But neither is what lawyers are helping
> to do to our hobby, our country and our world.
>
> People oftn use humor to release frustration and tension. The cost of
> doing business with and the results of lawyers causes both. No wonder
> there are so many lawyer jokes.
>
> Perhaps if lawyers had a canon of ethics which kept them from taking
> frivolous cases, charging exorbanant rates, raping those who win large
> judgement sums, and taking or making action that hurt groups like
> amateur radio they would have a some respect from the general public.
>
> Of course, some lawyer will try and justify or nullify the above. That's
> what they do.
>
> de kg7fu
>


I won't try to nullify your argument...I'm ready for a return to the wild
west where things got settled with force instead of the law...


From [e-mail] Tue Dec 03 19:56:51 1996
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From: "jongman" <[e-mail]>
Newsgroups: alt.satellite,alt.satellite.tv,alt.satellite.tv.crypt,alt.satellite.tv.europe,alt.satellite.tv.forsale,francom.radio_amateur,rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew,sci.astro.amateur
Subject: WENTED SPECIAL LNB'S WENTED
Date: 27 Nov 1996 06:55:30 GMT
Organization: transonic
Lines: 6
Message-ID: <01bbdc37$54d0c260$LocalHost@jongman>
NNTP-Posting-Host: zwl1-p60.worldonline.nl
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Hello,

I like to buy lnb's special X-BAND ,L-BAND,S-BAND if you have some
information.

Please E-mail [e-mail]


From [e-mail] Tue Dec 03 19:56:52 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!EU.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!news.fyi.net!news
From: Bob Morris K2RK <[e-mail]>
Subject: Re: More Amplifier Stuff
X-Nntp-Posting-Host: cooper11.fyi.net
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To: [e-mail]
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[e-mail] wrote:
>
> Anyone have information on building a homebrew 6 Meter amp (350-1000
> watts).
>
> with a input of atleast 10 watts?
>
> Have been looking every where.
>
> 73
Two minute check of 'shelf.... ARRL Handbooks '78 has a single 3-500z.
'81 has a 4CX1000....'95 has 3cx800.. Bill Orr has 3-400z
Read up on design and do 6146's 5894 etc, etc, etc........

Everywhere ??????????????????????????


From [e-mail] Tue Dec 03 19:56:53 1996
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From: Michael Richardson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.misc
Subject: WANTED:  good VOX schematic
Date: Wed, 27 Nov 1996 02:00:40 -0800
Organization: University of Washington
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Xref: news1.epix.net rec.radio.amateur.homebrew:21450 rec.radio.amateur.equipment:43127 rec.radio.amateur.misc:118924

I'm looking for a good VOX schematic -- something simple, yet
effective.

TIA,

Mike Richardson N5MR/7
[e-mail]


From [e-mail] Tue Dec 03 19:56:54 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.sprintlink.net!news-peer.sprintlink.net!news.ultranet.com!homer.alpha.net!news
From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602AN Circuits
Date: Wed, 27 Nov 1996 02:28:30 -0800
Organization: Aero Head Aviation
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
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To: [e-mail]

Rod Fitz-Randolph wrote:
>
> Does anyone have any circuit diagrams for the
> NE602AN?  Could you please tell me a source for
> good circuits using this device?  Thank you.  Rod, W5HVV

Most, if no all, QRP books available from ARRL have circuits using the
NE602 Mixer.  These are good starting points...73, Scott (N0EDV)

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Tue Dec 03 19:56:55 1996
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From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Specs 4-1000
Date: Wed, 27 Nov 1996 02:33:06 -0800
Organization: Aero Head Aviation
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]>
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To: Sonja og Petter Brevik <[e-mail]>

Sonja og Petter Brevik wrote:
>
> I am planning to build a new PA, using the 4-1000 tube. Does anybody
> have more complete specs than the summary found in the handbooks?
>
> 73,
> Petter
> --
> ---->   LA7YG
>         Petter Brevik
>         ╪stliveien 15           Tel [phone]
>         1482 Nittedal           Fax [phone]You can visit Eimac's webpa
ge at http://www.eimac.com/ and request info
on any of their tubes.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Tue Dec 03 19:56:56 1996
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From: [e-mail] (Thomas Mahanna)
Newsgroups: rec.radio.amateur.homebrew
Subject: TRADE : 2 AD7008's for 'C26 DSK
Date: 27 Nov 1996 05:40:53 -0500
Organization: ZIPNET.NET
Lines: 7
Message-ID: <57h5rl$[e-mail]>
NNTP-Posting-Host: zip1.ziplink.net
X-Newsreader: TIN [version 1.2 PL2]


Anyone got a TMS320C26 DSK to trade for 2 new AD7008's?

-Tom

[phone]



From [e-mail] Tue Dec 03 19:56:56 1996
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From: [e-mail] (lrb)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED TUBES
Date: Wed, 27 Nov 1996 12:54:55 GMT
Organization: MindSpring Enterprises, Inc.
Lines: 4
Message-ID: <57hdom$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: user-168-121-69-205.dialup.mindspring.com
X-Server-Date: 27 Nov 1996 12:55:50 GMT
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Looking for tubes, especially 8908.  Does anyone know where to find
them ?




From [e-mail] Tue Dec 03 19:56:57 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 27 Nov 1996 06:39:11 -0700
Organization: Internet Access of Ventura County
Lines: 58
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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In article <[e-mail]>, [e-mail]
wrote:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
>
> >Tom:  Who is the anonymous Mr. XXX?  Why does he list a ficticious Eimac
> >e-mail address?.
> >
> >Tom:   Who are/is "they"?.
> >
> >Tom:   What are the names of the people at Eimac, to whom you refer to as
> >"it's the
> >entire staff",  who allegedly say that Mr. Foote and I are wrong about
> >gold-sputtering being caused by an oscillation condition?
>
> Rich,
>
> I tried to avoid this, because it would leave you no way out. I really
> don't enjoy this, but I see no alternative.
...snip...

OK.  I will deal with Mr. Miklos when he comes on the Internet in January.

What is Mr. 'Buzz' Miklos' given first name?   Who was Mr. Miklos'
immediate supervisor when Mr. Miklos was allegedly employed as"R+D
engineering manager" at Varian-Eimac's Salt Lake City division?

Tom:
> Mr. Miklos said my interpretation of grid damage was correct, ... ...

Congratulations, Tom.  However, if Mr. Miklos won't be on the Internet
until January, how would he be reading this debate?  ........ Oops.. ...

You said that Mr. Miklos  "further stated a major cause of gold sputtering
is poor alignment between the grid and cathode bands "  I was not aware
that Varian-Eimac was selling amplifier tubes with poor grid/cathode
alignment.  This  is a surprising revelation, Tom.  In earlier times,
Eimac-quality was excellent.  In fact, all of the gold-sputtered tubes I
cut open and inspected for the article "Parasitics Revisited" appeared to
have correct alignment  between the grid and the cathode.

Tom:   You said "I tried to avoid this,... ..."---like hang on to your
hats, folks, here it finally comes. (trumpets heard off-stage)  However,
after the smoke and fanfare drifted away, it was abundantly clear to us
that you did NOT reveal the name of the anonymous Mr.XXX.

Tom:  What is the anode-resonant frequency in the AL-80? Why do you appear
to be avoiding the answer to this question?

Tom  Does the AL-1500 8877 amplifier, which you designed, use a VHF
parasitic oscillation suppressor?  Why do you appear to be avoiding the
answer to this question?
------------------------------------
e-mail copies to Mr. Rauch and the Good Source... mailing list

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:56:58 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!feed1.news.erols.com!phase2.worldnet.att.net!uunet!in3.uu.net!rcogate.rco.qc.ca!neon.mlink.net!news
From: "P. Belisle" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Yaesu FT-107M Transceiver
Date: 27 Nov 1996 13:59:16 GMT
Organization: Mlink Internet, Montreal, Canada
Lines: 11
Message-ID: <01bbdc6b$6e3ca460$41b3cdcd@belisle>
NNTP-Posting-Host: ax15.contact.net
X-Newsreader: Microsoft Internet News 4.70.1155

I Have a YAESU FT-107 M to repair,on the LSI
counter unit PB-2086A the counter led driver
MSM9520 made for Yaesu is dead and is not
available fromYaesu . I tried to find in the
IC MASTER an equivalent andso far I have had
no luck would ther be a good soul that could help
me to find either a board or a MSM9520 or an
equivalent six digit driver counter.

Thank you in advance
Pierre Belisle VE2VO


From [e-mail] Tue Dec 03 19:56:59 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!mr.net!news.mr.net!dawn.mmm.com!news
From: [e-mail] (Gary Hosler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More Amplifier Stuff
Date: Wed, 27 Nov 1996 14:52:36 GMT
Organization: 3M - St. Paul, MN  55144-1000 US
Lines: 31
Message-ID: <57hkl0$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
X-Newsreader: Forte Free Agent 1.0.82

Bob Morris K2RK <[e-mail]> wrote:

>[e-mail] wrote:
>>
>> Anyone have information on building a homebrew 6 Meter amp (350-1000
>> watts).
>>
>> with a input of atleast 10 watts?
>>
>> Have been looking every where.
>>
>> 73
>Two minute check of 'shelf.... ARRL Handbooks '78 has a single 3-500z.
>'81 has a 4CX1000....'95 has 3cx800.. Bill Orr has 3-400z
>Read up on design and do 6146's 5894 etc, etc, etc........

>Everywhere ??????????????????????????

Check out the handbooks in the early 80's.  For instance the 1981 ARRL
Handbook has in addition to the above mentioned 4CX1000, a nice single
4CX250B based amp.  10 watts of drive will result in about 500 watts
PEP.  You might also check out the July 85 issue of 73.  Nice article
on a 6M 4-1000 brute.  The 23rd edition (and I'm sure others) of Bill
Orr's Radio Handbook has a design for a 3-400Z or 3-500Z.  This one
will produce a KW for 35 watts of drive.  I could go on listing other
sources but don't think that is necessary.  6M amp designs abound!
Not sure where you have been looking but I'd find a different source
or find a good Elmer.

de KN0Z  Gary



From [e-mail] Tue Dec 03 19:57:00 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 27 Nov 1996 15:45:05 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] writes:

>
>Your move.
>
>73 Tom

Great work Tom!

I follow this thread with anticipation as do many more.

I can't talk 'tubes' like you and Rich do but I do some repair on
amps you all have mentioned.

Rich's grid dissipation rules would sell alot of replacement tubes.
Although I'm sure the warranty would fade away fast.

Enough of that.


Can you tell me why 4 472B PENTA tubes in a Clipperton L lasted
only a few days. I replaced the original tubes and they are still working
but at reduced output which was the reason to buy the new tubes. The
new tubes fell to 100 watts out on 10. Nothing was changed in the
amp..nothing.
Same exciter - FT-767.
Just bad tubes?

Carl The2x4
N9EFJ




From [e-mail] Tue Dec 03 19:57:01 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!uunet!in3.uu.net!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 27 Nov 1996 08:46:44 -0700
Organization: Internet Access of Ventura County
Lines: 43
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <57gokd$[e-mail]>
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In article <57gokd$[e-mail]>, [e-mail] (Roger
Stevens) wrote:

> Let's see here.  Is this a 15-rounder, or an unsanctioned non-title fight?
>
> I would have to deduct a point from Mr. Measures for taunting, and award a
> point to Mr. Rauch for even-temperedness.

Mr. Rauch has repeatedly not answered simple questions like whether or not
he incorporated a VHF parasitic- oscillation suppressor in the design of
his AL-1500 amplifier.  The answer is either yes or no.


Mr. Rauch proposed that I calculate the VHF current distribution in the
AL-80's parasitic suppressor.  Three things are needed to do the
calculations.  L, R and the frequency (of the anode resonance).  Mr. Rauch
states that L is 85nH, that R is 100 ohms, but despite an abundance of
requests from me, he has so far not stated what the frequency is.

Ç  Roger:  how many points would you award to each pugilist for evasiveness?
>
> However, on these and one other issue on which I am in need of guidance
> (whether or not to short unused turns in a T-match rotary inductor), I must
> plead OJ-Jury-Syndrome: it's like the DNA evidence--too complicated.

If you enjoy seeing eyebrow-raising, eye-popping,  coil-to-frame arcing at
the open end of the inductor, DO NOT short the unused turns.  OTOH, if you
would rather loose a few watts, and forgo the arcing, short the unused
turns.

However, I absolutely, positively, 100% have no idea whatsoever how one can
gash one's finger on a cellphone.

Alas, this debate was not my idea, Roger.  Since 1990, Mr. Rauch has
indicated that he wanted a public debate with yours truly about the subject
of parasitics.  Debating with Mr. Rauch has so far been like trying to play
poker with a guy who proudly declares he has the winning hand, but  refuses
to lay his cards on the table.
-----------------------------------------
e-mail copies to Messrs. Clark, Rauch and the Good Source... mailing list.

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:57:02 1996
Message-ID: <[e-mail]>
Date: Wed, 27 Nov 1996 10:09:40 -0600
From: Bruce <[e-mail]>
Organization: R. S.  Inc.
X-Mailer: Mozilla 2.0 (Win95; I)
MIME-Version: 1.0
Newsgroups: rec.radio.amateur.homebrew
Subject: TK-370 info
Content-Type: text/plain; charset=us-ascii
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I need kenwood tk-370 programing info. If you have some info or links
for this please e-mail me
Bruce
[e-mail]


From [e-mail] Tue Dec 03 19:57:03 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 27 Nov 1996 09:17:12 -0700
Organization: Internet Access of Ventura County
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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In article <[e-mail]>, [e-mail]
wrote:

> In article <[e-mail]>,
> [e-mail] writes:
>
> >
> >Your move.
> >
> >73 Tom
>
> Great work Tom!

Ç  Carl:  the intro was great, but did you ever figure out what the name of
Mr. XXX is?

...snip...
>
> Can you tell me why 4 472B PENTA tubes in a Clipperton L lasted
> only a few days. I replaced the original tubes and they are still working
> but at reduced output which was the reason to buy the new tubes. The
> new tubes fell to 100 watts out on 10. Nothing was changed in the
> amp..nothing.
> Same exciter - FT-767.
> Just bad tubes?

Ç  Carl:  In the new, Penta 572B tubes that failed, did you see bits of
filament wires and springs at the bottom of the glass envelope?
-------------------------------------------------------
e-mail copies to Messrs. Mottsinger, Rauch and others

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:57:04 1996
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From: "Tom C. Brown, Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KISS
Date: Wed, 27 Nov 1996 10:18:39 -0600
Organization: Madison Materials Company
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tc3_5.teclink.net
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>>AG6K math in calculating R/L current percentages on straight sum is WRONG!
>>Supressor inductance on VHF would affect oscilations by changing the phase
>>angle and not solely by reactance value.<<

Hi Mario-

OK.  But.....what guarantees that the phase shift you refer to will
*dampen* a potential oscillation, rather than *add* to it?

As some others have said, it's a complex situation......

73, Tom KJ5IE
(2000 miles from Hollywood)


From [e-mail] Tue Dec 03 19:57:07 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KISS
Date: 27 Nov 1996 16:29:32 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 31
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail]
(Gary Coffman) writes:
>
>I do think that many of Rich's proposed mechanisms are highly
implausible.
>OTOH, Tom's rather cavalier explanations don't wash either. Amplifiers
*can*
>break into oscillation.

I never said amplifiers "can't" oscillate. I just indicated that by proper
design and testing the likelyhood of oscillation can be reduced to zero.
My point was a properly operating PA does not go happily along for weeks,
months or years and suddenly require a transfusion of nichrome.

My point is a linear PA with near critical feedback doesn't suddenly break
into oscillation and produce currents that destroy components like tubes.
The very mechanics of oscillation prevent that, let alone emission limits
in the tube.

By far the most destructive oscillations are those that occur near the
operating frequency. Dentron Clippertons do this, because the 4 572B tubes
are unstable in the upper HF regon.

In over 20 years of commercial PA design and 34 years of amateur PA design
and construction I have never found a PA that "oscillates" in the field
through a defect or fault rooted in the PA that can not be made to
oscillate in a test situation.

That's not a guess, it's a fact.

73 Tom


From [e-mail] Tue Dec 03 19:57:10 1996
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From: [e-mail] (Pat Barthelow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #532
Date: 27 Nov 96 16:44:32 GMT
Organization: ucsd usenet gateway
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Re Amplifier using 304tl tube.....
Many transmitting tubes become defective with age, even if stored
carefully, due to gas intrusion through the metal to glass seals over
time.  The 304 TL tube is a very old design....you might want to verify
it's usable condition before you design an amp around it.  Also, to
design an amp is a very satisfying project.  I wish you luck, and also, I
found that friendly talks with FM broadcast engineers, particularly with
those who mainain 1 or 2 kw FM stations to be valuable.  Many use 4-400A
based transmitters, and sometimes have spare tubes available to radio
amateur builders....I built my first KW amp around 4-400A tubes that I
got at no cost from the local broadcast engineers...
good luck....
de Pat, AA6EG, [e-mail]


From [e-mail] Tue Dec 03 19:57:10 1996
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From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for RF power module S-AV22A (FM 2m)
Date: Wed, 27 Nov 1996 17:02:17 GMT
Organization: RST Engineering
Lines: 18
Message-ID: <57hs9c$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] shared these priceless pearls of wisdom:


->I am looking for the RF VHF FM power module
->(Mitsubishi type S-AV22A)

I believe (although am not positive) that the actual mfg. is Toshiba; I've
gotten mine from an outfit called RF Parts, in San Marcos CA.  Regrets I
don't have their phone number or email address.

Jim

Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company -- and I'm damned proud to do so.
Grass Valley CA 95945   | Airport: O17 (Grass Valley Intentional Airpatch)
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1st phone---C-182A N73CQ
[e-mail]        | Comm'l/CFI-Airplane/Glider-A&P-FAA Counselor



From [e-mail] Tue Dec 03 19:57:11 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: ? Mitsubishi Semiconductor Homepage
Date: 27 Nov 96 17:02:45 GMT
Organization: Siemens AG, Public Communication Networks, Munich Germany
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


Hello all,

The page

http://design-net.com/cgi-bin/dlsrch

is a good page to request datasheets of Motorola's RF power devices.

But, does anyone know if and where to request the datasheets of Mitsubishi'=
s =
power devices? I think they should be considered if someone is looking for =
power amps on hf and vhf, but do not know where to get the datas.

vy 73, Guenter, DL4MEA=40DB0KCP.=23BAY.DEU.EU   (AX.25)
                dl4mea=40amsat.org            (Internet)
                http://www.scn.de/=7Ekoellner (WWW)



From [e-mail] Tue Dec 03 19:57:12 1996
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From: Dave Maley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for RF power module S-AV22A (FM 2m)
Date: Wed, 27 Nov 1996 11:07:09 -0600
Organization: Internet Navigator, Inc.
Lines: 19
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[e-mail] wrote:
>
> I am looking for the RF VHF FM power module
> (Mitsubishi type S-AV22A), used in the rtx Kenwood TH77E
> which is powered with 9-12 V and provides around 5 W.
>
> Could you please tell me how much this item costs
> and where I can buy it?
>
> Please send your reply to my e-mail address, as detailed below.
>
> 73 de IW1DZD
>
> e-mail address: [e-mail]
>
>

Check with Richardson Electronics.  They normally sell big transmitting
tubes, but are starting to sell these things.   Dave  WA0ZZG


From [e-mail] Tue Dec 03 19:57:13 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!feed1.news.erols.com!howland.erols.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!xetron.com!news
From: [e-mail] (Tim Huster)
Subject: Re: Looking for RF power module S-AV22A (FM 2m)
Content-Type: Text/Plain; charset=US-ASCII
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: timh.xetron.com
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Mime-Version: 1.0
Date: Wed, 27 Nov 1996 17:35:08 GMT
Lines: 31

RF Parts (800)RF-PARTS orders. ([phone] Technical questions.
[phone] FAX

SAV22A  144-148MHz (130-160MHz BW Max), Pin=15mW, Pout=7W. $46.95(qty. 1-4)


In article <[e-mail]>, [e-mail]
M
says...
>
>
>I am looking for the RF VHF FM power module
>(Mitsubishi type S-AV22A), used in the rtx Kenwood TH77E
>which is powered with 9-12 V and provides around 5 W.
>
>Could you please tell me how much this item costs
>and where I can buy it?
>
>Please send your reply to my e-mail address, as detailed below.
>
>73 de IW1DZD
>
>
>e-mail address: [e-mail]
>
>

--
 Timothy W. Huster
 http://www.xetron.com/~timh      [e-mail]
 "...and Dad! Just wait a Minute, for a Second!" Andrew H. age 4



From [e-mail] Tue Dec 03 19:57:14 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.dx,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: ARRL lawyer to sue member
Date: Wed, 27 Nov 96 10:46:29 PDT
Organization: TAC, The Atlanta Connection and Radio.Org
Lines: 47
Message-ID: <[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]> <[e-mail]> <57f5ou$[e-mail]>  <01bbdc0a$ff402c40$[e-mail]>
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In Article<01bbdc0a$ff402c40$[e-mail]>, <[e-mail]> writes:
> Path: news.radio.org!metro.atlanta.com!news.he.net!www.nntp.primenet.com!nnt
p.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.rio.com!news
> From: "FUman" <[e-mail]>
> Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.rad
io.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio
.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
> Subject: Re: ARRL lawyer to sue member
> Date: 27 Nov 1996 02:28:05 GMT
> Organization: kg7fu
> Lines: 25
> Message-ID: <01bbdc0a$ff402c40$[e-mail]>
> References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]
.ac.uk> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac
8a$[e-mail]> <[e-mail]> <57f5ou$22h@
cc.iu.net>
> NNTP-Posting-Host: p59.t0.rio.com
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al.misc:9027 rec.radio.amateur.dx:1192 rec.radio.amateur.equipment:24086 rec.r
adio.amateur.homebrew:11023 rec.radio.amateur.misc:29505 rec.radio.amateur.pol
icy:12573 rec.radio.amateur.space:3862
>
> > In <[e-mail]>, [e-mail] (CDN) writes:
> > >when you tell a joke about a lawyer it is called funny?
> > >hmmmm
>
> Maybe the jokes aren't funny. But neither is what lawyers are helping
> to do to our hobby, our country and our world.
>
> People oftn use humor to release frustration and tension. The cost of
> doing business with and the results of lawyers causes both. No wonder
> there are so many lawyer jokes.
>
> Perhaps if lawyers had a canon of ethics which kept them from taking
> frivolous cases, charging exorbanant rates, raping those who win large
> judgement sums, and taking or making action that hurt groups like
> amateur radio they would have a some respect from the general public.
>
> Of course, some lawyer will try and justify or nullify the above. That's
> what they do.
>
>
> de kg7fu
> =20
>
>
>
YEA! YOU TELL'EM JAMES!!!!!!!!!!!!!!!!!!!!!!!!!!!

de kd6clo   :)



From [e-mail] Tue Dec 03 19:57:16 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!feed1.news.erols.com!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 27 Nov 1996 18:33:06 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 32
Message-ID: <[e-mail]>
References: <[e-mail]>
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X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>What is the anode resonant frequency in the AL80?  You find this with a
>dipmeter coupled to either side of the dc blocking capacitor.  I can not
>calculate the current distribution without knowing the frequency of the
>anode resonance.  If you do not have access to a dipmeter and an AL80,
>please let me know and I will call around and see if I can find someone
who
>does.

>First things first.   I need to calculate the current distribution for
85nH
>and 100 ohms, but I can not do it until someone uses a dipmeter and
>measures the anode resonant frequency in the amplifier that this
suppressor
>is used in.

Resonance tells us nothing about impedance, except the reactance cancels
or crosses zero. Even though you do not understand VAR power, phase shift,
or Q I still expect you should understand a very simple concept like
resonance!

A circuit at resonance could look like zero ohms, infinite impedance, or
anything in between. So even if we know the frequency of resonance, we
know nothing about the impedance of the circuit and can do no
calculations.

Why ask for meaningless data? What is it you want to do, and I will tell
you what numbers you need to do that.

Tom


From [e-mail] Tue Dec 03 19:57:19 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!newsfeed.internetmci.com!feed1.news.erols.com!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 27 Nov 1996 18:33:07 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 36
Message-ID: <[e-mail]>
References: <[e-mail]>
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Hi Carl,

Would you (or any other person) like to talk to Mr. Miklos about tubes,
and report back to us about his opinions of Measures articles and
suggestions? He hasn't the time to get on now, but he would be willing to
answer questions on the land line.

If you had time, a few other Eimac and ITT design engineers might also be
located. You could tell us in your own words what their opinions of Rich's
theories are.

In article <[e-mail]>, [e-mail]
writes:

>Can you tell me why 4 472B PENTA tubes in a Clipperton L lasted
>only a few days. I replaced the original tubes and they are still working
>but at reduced output which was the reason to buy the new tubes. The
>new tubes fell to 100 watts out on 10. Nothing was changed in the
>amp..nothing.
>Same exciter - FT-767.
>Just bad tubes?

I don't know Carl. Anything I say would be a guess, unless I had much more
information. I am working with some 572B's now in a homebrew PA, but the
circuit I have used is quite different than the Dentron.

I don't think highly of the Dentron design. It has a very poor layout, and
the tubes are not neutralized.  I am also not sure of the reliabilty or
service history of Penta 572B's.

I'd like to have any information I could about them. Did the tubes work
correctly initially? Can you describe in detail how the failed? Do the old
tubes still work the same? Who was the vendor, what was the country of
origin?

73 Tom


From [e-mail] Tue Dec 03 19:57:21 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!newsfeed.internetmci.com!tezcat!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news
From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: W  Heath HP-20 Schematic
Date: 27 Nov 1996 18:50:30 GMT
Lines: 31
Message-ID: <57i2hm$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: cna0952843.dseg.ti.com
Mime-Version: 1.0
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Dennis,

You might write to Marty Drift, WB2FOU, and see if he has this manual.
He's a Heathkit collector, and I know he has an HP-20 (he got it from
me several years ago).  He's listed in the QRZ database (Blawenburg,
New Jersey).

73 de KC5NG



In article <[e-mail]>, [e-mail] says...
>
>I need a schematic for a Heath HP-20 power supply.  Please e-mail me at
>[e-mail] for arrangements, or I am good in the QRZ
>database.
>
>de Dennis/w0gd

--
Dean W. Hemphill                      Email: [e-mail]
PO Box 328                            Home:  [phone]
Lake Dallas, Texas 75065-0328         Work:  [phone]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amateur radio operator KC5NG, Extra Class, VE (ARRL/W5YI), QRPer, CW op
Ford Mustang enthusiast ('66 coupe, '69 GT-350, '72 conv, '95 GT conv)
Die-cast model car collector (Ford products only, in all scales)
Plastic model car builder (Ford products only, 1:24 and 1:25 scale)
Glass insulator collector (specializing in "oddball" pieces)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



From [e-mail] Tue Dec 03 19:57:22 1996
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From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for RF power module S-AV22A (FM 2m)
Date: 27 Nov 1996 18:52:02 GMT
Lines: 37
Message-ID: <57i2ki$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: cna0952843.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

SAV22A $44.95 plus s/h from RF Parts Company 1-800-RF-PARTS

73 de KC5NG


In article <[e-mail]>,
[e-mail] says...
>
>
>I am looking for the RF VHF FM power module
>(Mitsubishi type S-AV22A), used in the rtx Kenwood TH77E
>which is powered with 9-12 V and provides around 5 W.
>
>Could you please tell me how much this item costs
>and where I can buy it?
>
>Please send your reply to my e-mail address, as detailed below.
>
>73 de IW1DZD
>
>
>e-mail address: [e-mail]
>
>

--
Dean W. Hemphill                      Email: [e-mail]
PO Box 328                            Home:  [phone]
Lake Dallas, Texas 75065-0328         Work:  [phone]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amateur radio operator KC5NG, Extra Class, VE (ARRL/W5YI), QRPer, CW op
Ford Mustang enthusiast ('66 coupe, '69 GT-350, '72 conv, '95 GT conv)
Die-cast model car collector (Ford products only, in all scales)
Plastic model car builder (Ford products only, 1:24 and 1:25 scale)
Glass insulator collector (specializing in "oddball" pieces)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



From [e-mail] Tue Dec 03 19:57:23 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!newsfeed.internetmci.com!tezcat!feed1.news.erols.com!howland.erols.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for RF power module S-AV22A (FM 2m)
Date: 27 Nov 96 19:34:54 GMT
Organization: ucsd usenet gateway
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


I am looking for the RF VHF FM power module
(Mitsubishi type S-AV22A), used in the rtx Kenwood TH77E
which is powered with 9-12 V and provides around 5 W.

Could you please tell me how much this item costs
and where I can buy it?

Please send your reply to my e-mail address, as detailed below.

73 de IW1DZD


e-mail address: [e-mail]




From [e-mail] Tue Dec 03 19:57:23 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!feed1.news.erols.com!news.idt.net!nntp.farm.idt.net!news
From: Chris Mesibov <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: looking for low ppm trim pots
Date: Wed, 27 Nov 1996 13:40:49 -0600
Organization: Noise Com
Lines: 6
Message-ID: <[e-mail]>
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Looking for some good sources that have "RJR" style trimmer pots  with
low tempco.  Dale/Vishay is quoting me 6 weeks on a 17s102! Who has
stock?

Thanks,
Chris


From [e-mail] Tue Dec 03 19:57:25 1996
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From: Steve C <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Band pass filter for 144MHz reqd?
Date: Wed, 27 Nov 1996 20:18:29 +0000
Organization: Moi
Lines: 46
Distribution: world
Message-ID: <OYw$[e-mail]>
References: <[e-mail]>
 <[e-mail]>
NNTP-Posting-Host: mjrigby.demon.co.uk
X-NNTP-Posting-Host: mjrigby.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 3.01 <T2w2CrMWZo0IoIUzHnNu7d3DSI>

Hi Ian,

>Is this the right question?

Well, I think so..

The prob is thus:

I operate on a portable site near a commercial mast. We get some QRM
which shuts down the rig almost completely. I think this is caused by
the mast, maybe taxi band, or even police YK type repeaters.

My idea is to band stop all but 2m and see the results.

I dont always use the same rig, so I want a filter to put in line,
preferably after the amp, so that if it works, I can have it before the
amps' pre-amp.(Not got mast-head :-(

>Very cheap and effective harmonic notch filters cut from ordinary coax
>were described by G4SWX in RadCom about a year ago.

Now this is a good point, I had overlooked this.

(Has been to work and tried it...)

I tried a simple quarter wave stub, which  gave a great notch, and tried
shorting it.(Was sure read shorted stub opposite of open) but not really
any good.Just a notch at 2 lambda.
Is there a simple coax bandpass I can try ?? (I can sweep from 400hz to
2500Mhz, so can look all over...)
I did notice the notch was only about -40dB (though our power head
doesn't go much lower, it wasn't noisy at all so I trust it) and
sometimes was only -30dB.

>If this is a breakthrough problem, you can probably have your station
>officially inspected and your equipment checked by the Radio
>Investigation Service at no charge - e-mail me for details.
>(Limited offer, applies in Britain only :-)

I've used the open quarter wave (if remember right) as filters for
neighbours, worked very well.(Which is why I should have thought of a
coax filter :-)

Thanks for the reply..
--
Steve C


From [e-mail] Tue Dec 03 19:57:26 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!newsfeed.internetmci.com!feed1.news.erols.com!howland.erols.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!mjrigby.demon.co.uk!Steve
From: Steve C <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Gamma Match
Date: Wed, 27 Nov 1996 20:46:20 +0000
Organization: Moi
Lines: 24
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mjrigby.demon.co.uk
X-NNTP-Posting-Host: mjrigby.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 3.01 <T2w2CrMWZo0IoIUzHnNu7d3DSI>

In article <[e-mail]>, Tim Johnston - KF4FTP
<[e-mail]> writes
>I am a fairly new ham (ticket in Jan 96) and have a question about a
>gamma match ... what is it?  I was listening in to a technical
>roundtable the other nite about building an HF antenna and feeding it
>with a gamma match, and was afraid to show my ignorance.
>
>Tnx!
Hi Tim,

A gamma match is a good way to feed an unbalanced feeder (coax) to a
balanced antenna (the dipole on the yagi).
It is essentially a capacitor and an inductor (simply).
The shield of the coax is connected to the centre of the grounded (to
boom) driven element. The inner goes through a capacitor (which can be a
real capacitor, or a rod inside a tube insulated from it) into an
inductor which normally runs parallel with one side of the dipole, and
is shorted to it at some point.

Its actually an easy feed to homebrew...


--
Steve C


From [e-mail] Tue Dec 03 19:57:27 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!express.ior.com!cnn.isc-br.com!olivea!news.sgi.com!howland.erols.net!newsfeed.internetmci.com!news.clubnet.net!usenet
From: Henry <[e-mail]>
Newsgroups: alt.jobs,alt.job,misc.jobs.offered,us.jobs.misc,us.jobs.offered,alt.radio.scanner,rec.radio.scanner,rec.radio.swap,rec.radio.amateur.equipment,alt.ham.radio.disitalvoice,sci.electronic.misc,rec.radio.amateur.homebrew,rec.radio.amateur.difital,rec.radio.amateur.antenna,rec.radio.amateur.dx,rec.radio.amateur.misc
Subject: CA: SALES MANGER WANTED
Date: Wed, 27 Nov 1996 14:28:04 -0800
Organization: Premier Communication
Lines: 27
Message-ID: <[e-mail]>
NNTP-Posting-Host: db1-ppp20.dial.clubnet.net
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To: [e-mail]
Content-Disposition: inline; filename="Position for immediate consideration.txt"
Xref: news1.epix.net alt.jobs:167998 misc.jobs.offered:1714615 alt.radio.scanner:42321 rec.radio.scanner:71775 rec.radio.swap:97160 rec.radio.amateur.equipment:43255 rec.radio.amateur.homebrew:21508 rec.radio.amateur.antenna:32163 rec.radio.amateur.dx:1428 rec.radio.amateur.misc:119052

Position for immediate consideration

        Sales Manger

Location:

        Walnut, California (20 Miles from Los Angeles )

Requirements:

* Knowledge of Ham & Commercial Radio Marketing
* Positive attitude and Excellent Customer Skill
* Willing to Travel
* Experience Necessary
* Live in Los Angeles /Orange County Area

TO APPLY FOR THIS POSITION PLZ SEND RESUME TO


        e-mail:         [e-mail]

                or

        Fax     [phone]





From [e-mail] Tue Dec 03 19:57:27 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!feed1.news.erols.com!howland.erols.net!news2.digex.net!news
From: Mark Sandford <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TRADE : 2 AD7008's for 'C26 DSK
Date: Wed, 27 Nov 1996 17:44:28 -0500
Organization: DIGEX
Lines: 18
Message-ID: <[e-mail]>
References: <57h5rl$[e-mail]>
NNTP-Posting-Host: tridsys.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (X11; I; IRIX 5.3 IP22)

Thomas Mahanna wrote:
>
> Anyone got a TMS320C26 DSK to trade for 2 new AD7008's?
>
> -Tom
>
> [phone]
I don't have a C26 DSK but I do have a couple C50 DSK's, as far as I
know the only real difference between the C26 and C50 except minor
architectural improvements is that C25/C26 use 4 clocks per instruction
while the C50 uses only two so the C50 should always be twice as fast,
and should be 100% compatable will all code as long as C25/C26
complatability in specified in the compiler/assembler. E-mail if
interested.

Mark Sandford
Principal Engineer
Trident Systems


From [e-mail] Tue Dec 03 19:57:29 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KISS
Date: Wed, 27 Nov 1996 17:19:56 -0700
Organization: Internet Access of Ventura County
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
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In article <[e-mail]>, [e-mail] wrote:


> AG6K math in calculating R/L current percentages on straight sum is WRONG!

Please show us the CORRECT solution, Mario.

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:57:30 1996
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From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: good source for amplifier tips
Date: 28 Nov 1996 00:59:18 GMT
Organization: KN6DV
Lines: 9
Message-ID: <01bbdcc7$669ba6a0$[e-mail]>
NNTP-Posting-Host: palm01-28.ca.qnet.com
X-Newsreader: Microsoft Internet News 4.70.1155

I have upload part 6 (this is a long one):
http://www.av.qnet.com/~kn6dv
Thanks 73 Will,  KN6DV
REFORM
Unless the reformer can invent something which substisutes attractive
virtues for atractive vices, he will fail.
(Walter Lippmann)

[e-mail]


From [e-mail] Tue Dec 03 19:57:32 1996
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From: "Erik Skovgaard" <[e-mail]>
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: 28 Nov 1996 03:47:14 GMT
Organization: BCTEL Advanced Communications
Lines: 31
Message-ID: <01bbdcdf$8a603840$3fc56cce@default>
References: <56bbbe$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <575asp$[e-mail]> <[e-mail]> <[e-mail]>
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Jay,

It must be a local problem.  It works for me.  Try it a couple of times.
Sometimes the DNS cache needs to be refreshed and a second or third attempt
does the job.  Netscape is a little impatient with DNS.

73 de VE7MDL                 ....Erik.


Jay <[e-mail]> wrote in article
<[e-mail]>...
> [e-mail] (Dave Rickmers) wrote:
>
> >[e-mail] (Tim Smith) wrote:
> >
> >
> >>Can you tell me what the s/w is called and where I could d/l it?
> >>
> >>> http://www.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
> >>> ftp://ftp.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
1032518 bytes
> >>>
> >>> sbfft11.zip     Sound Blaster spectral display and filtering
> >dr
> Is the software anywhere else on the net?? I can't connect to
> simtel.net for some reason. Netscape keeps giving me "no DNS entry"
>
> Thanks
> Jay
> [e-mail]
>


From [e-mail] Tue Dec 03 19:57:33 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!vixen.cso.uiuc.edu!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Franklyn Brooker)
Newsgroups: rec.radio.amateur.homebrew
Subject: request for information
Date: 28 Nov 96 04:43:54 GMT
Organization: intech ltd
Lines: 9
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

(1) Looking for a CW memory keyer using a microprocessor maybe Z80. One
that can be truly homebrew.

(2) Information on Audio voice gating with circuit(s) if possible

(3) A link to an Audio site e.g. amplifiers, speaker design etc.

Frank Brooker
9Y4VU


From [e-mail] Tue Dec 03 19:57:34 1996
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From: "Chuck (Jack) Hawley" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: E.F.Johnson Ceramic Coils
Date: Wed, 27 Nov 1996 22:46:20 -0600
Organization: University of Illinois at Urbana-Champaign
Lines: 35
Message-ID: <[e-mail]>
NNTP-Posting-Host: ruger-43.slip.uiuc.edu
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>From - Mon Nov 25 10:36:27 1996
Message-ID: <[e-mail]>
Date: Mon, 25 Nov 1996 10:36:27 -0600
From: "Chuck (Jack) Hawley" <[e-mail]>
Organization: University of Illinois at Urbana-Champaign
X-Mailer: Mozilla 3.0Gold (Win95; I)
MIME-Version: 1.0
To: Multiple recipients of list <[e-mail]>
Subject: E. F. Johnson pre WW2 coils
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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Hi,

A friend of mine (Bill, N4VMY) would like to find a source of the
ceramic plug in coils manufactured by E. F. Johnson prior to WW2. The
ones he wants are wound on ceramic forms, rated at 500 watts and are
mounted on a 5 pin plug bar. He has a complete set of the 150 watt ones
(which he calls the grid coils) and wants the 500 watt ones (plate
coils) to complete an AM transmitter. There is a picture of these in the
10th Radio Handbook on page 650 (in the ad section) but there are no
part #'s listed. If anyone has part #'s for these coils, I would
appreciate those too.

After the war in about 1948, Johnson introduced the air wound coils with
the swinging link deal, so the only pictures in the handbooks of these
ceramic ones should be in the pre 1948 or pre war publications.

Thanks,

Chuck, KE9UW




From [e-mail] Tue Dec 03 19:57:35 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Gamma Match
Date: 28 Nov 1996 05:08:34 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 13
Message-ID: <[e-mail]>
References: <57g5nl$[e-mail]>
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X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <57g5nl$[e-mail]>, mays@indigo (Skip May) writes:

>
>The gamma can be considered a few different things at the same time,
>matching the typical 50 ohm coax to the driven element of the beam
>which has a different complex impedance (ac resistance), you could call
>it a tuner and/or matching network.
>
>
Nice answer....
It is indeed. The YAGI feedpoint is about 20 ohms.

Carl


From [e-mail] Tue Dec 03 19:57:37 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 28 Nov 1996 05:08:36 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 38
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

Yes, I have the time to talk to Mr. Miklos and others.

The 572B's were installed and all appeared OK. I was not
there when they failed. The exciter was a FT-767. I did however
put the old tubes back in and they worked at their previous
output before the Pentas were installed which is about 600 watts.
These old tubes are in fact still in use after two years. Upon initial
installation
the 4 Penta's output was a little low but not enough to be concerned with.
My customer still has the old tubes and if I get a chance I'll check them
out.
Rich asked if pieces of the tube innards were floating around. I don't
think so but I'll look again. If fact the tubes looked brand new just
dead.
I wish I could tell you more.

I had a similar case last week with a SB200. In fact it is still here
waiting to
be picked up. A previous owner other than my customer had installed a
standby switch and messed up the bias placing -130 some odd volts on the
bias line at all times

My customer bought it and couldn't get the amp to put out more than 100
watts, so he bought a pair of new Russian tubes from RF PARTS then brought
it to me.

The old tubes were Certron and ended up doing about 350 on 80. Exciter was
an
FT-757.  I installed the new, still in the taped up boxes, Svetlana tubes
and only got 100 watts or so output. Same exciter, same amp. What gives? I
made no attempt to delve further in to the situation. Just thought you
might provide an answer from a similar problem. I think these tubes are
terrible! I would hope they are direct replacements and I'm sure everyone
else assumes that. How can they sell them? Why do the offer them for sale?
So they are cheaper. That won't get you across
town with these tubes.

Carl N9EFJ


From [e-mail] Tue Dec 03 19:57:38 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 28 Nov 1996 05:08:38 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]>
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X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (R. L. Measures ) writes:

>
>Ç  Carl:  In the new, Penta 572B tubes that failed, did you see bits of
>filament wires and springs at the bottom of the glass envelope?

I don't think so Rich. It has been a while. But the owner still has the
Penta tubes
and next time around I will look. I do remmeber that the tubes looked
brand new.
Do these Penta tubes have rusty ol' innards?

Carl
N9EFJ


From [e-mail] Tue Dec 03 19:57:39 1996
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From: [e-mail] (Brian Carling)
Newsgroups: rec.radio.amateur.homebrew
Subject: PARTS TRADING
Date: Thu, 28 Nov 1996 10:13:16 GMT
Organization: Monumental Network Systems
Lines: 16
Distribution: inet
Message-ID: <57k2us$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82

I have parts for trading - specifically a bunch of ICs and transistors etc.
What I am looking for is a "Grid Dip" meter, a newer Tube Tester that works
on 7 and 9 pin bottles etc, and any tubes or tube-era type parts, chassis,
carcasses or whatever.

Please e-mail me or write to:
Brian Carling
18016 Fertile Meadow Court
Gaithersburg, MD 20877 USA

Thanks & 73 - AF4K / G3XLQ
73 from Amateur Radio AF4K  /  G3XLQ
http://www.mnsinc.com/bry
E-mail:  [e-mail]
Home of MEGALIST ham radio files, pirate links etc. etc.



From [e-mail] Tue Dec 03 19:57:40 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!feed1.news.erols.com!howland.erols.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: QST auto ATU (Jan '96)
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <57822u$[e-mail]>
Date: Thu, 28 Nov 1996 14:16:44 GMT
Lines: 17

In article <57822u$[e-mail]> [e-mail] (Pau
l Mooney) writes:
>In the January 1996 issue of QST an automatic ATU (the AT-11) is
>described.
>
>Has anybody built this, and if yes, how satisfied with it are you?

Mine is almost ready for the smoke test. I've stuffed the board, but
I haven't wired it into the cabinet yet. Board quality is Ok, parts
quality seems Ok, and the instructions are adequate. The acid test
will be if it actually tunes.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Dec 03 19:57:41 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 28 Nov 1996 08:29:55 -0700
Organization: Internet Access of Ventura County
Lines: 28
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port53.vcnet.com
Mime-Version: 1.0
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Content-Transfer-Encoding: 8bit
X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <[e-mail]>, [e-mail]
wrote:

> In article <[e-mail]>,
> [e-mail] (R. L. Measures ) writes:
>
> >
> >Ç  Carl:  In the new, Penta 572B tubes that failed, did you see bits of
> >filament wires and springs at the bottom of the glass envelope?
>
> I don't think so Rich. It has been a while. But the owner still has the
> Penta tubes
> and next time around I will look. I do remmeber that the tubes looked
> brand new.
> Do these Penta tubes have rusty ol' innards?
>
> Carl
> N9EFJ

Nope, Carl.  I haven't spotted any rust.  I have heard reports of virtually
new Penta 572Bs that wound up with broken filament wires.  Did notice that
the light from the filaments went out in the 572Bs that failed?  Were the
grids directly-grounded in the amplifier?
---------------------------------
e-mail copy to Carl, N9EFJ

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:57:42 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 28 Nov 1996 11:17:13 -0700
Organization: Internet Access of Ventura County
Lines: 67
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port5.vcnet.com
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In article <[e-mail]>, [e-mail]
wrote:

> Hi Rich,
>
> You must be having E-mail trouble. Could you look this over an comment. It
> seems to indicate you do not understand Q. Could you tell me if I did
> something wrong?
>
Hello, Tom---

 Nah, you haven't done anything wrong yet--if you are trying to play this
debate for stalemate instead of checkmate.  It is true that if you continue
to stonewall embarrassing questions, stall, and smokescreen, I will
eventually walk.

Either you are reluctant to admit that you don't own a dipmeter with which
to make the anode-resonance measurement that we need to proceed, or you
don't have access to an AL-80, or you are trying to misdirect attention
away from the problem that you proposed---i.e., to find the current ratio
in the 85nH (Ls) and100 ohm (Rs) parasitic suppressor which you use in one
version of the AL-80.  I am starting to lean toward the latter possibility.

  Tom:  In order to try and get a handle on what's happening, I will give
you the benefit of the doubt and guesstimate that the anode resonant
frequency in the AL-80 is 160MHz, although I seem to recall hearing a lower
number from AL-80 (and SB-1000) owners.  Using the formula XL=2*Pi*f*L, at
160MHz, 85nH has 6.28*1.6*10^5*85*10^-9=85.4513, or roughly 90 ohms of
reactance.  To find the current distribution, we can apply 1V to the
paralleled Rs and Ls.   The resulting current through Rs is 1v/100 ohms =
10mA.  The current through Ls is 1v/90 ohms = 11.1mA.  The total current is
10mA plus 11.1mA = 21.1mA.  The current through Rs is 10/21.1 = 0.474 of
the total current.  The current through Ls is 11.1/21.1 = 0.526 of the
total current. If 52% of the VHF current is flowing through Ls, and 48% of
the VHF current is flowing through Rs, there is obviously a large hole in
the opinion Tom Rauch has held since 1990--i.e., that no significant VHF
current flows through a VHF parasitic-suppressor's L.  The bottom-line is
that in the typical VHF parasitic-oscillation suppressor, significant
current flows in Rs and significant current flows in Ls.
 However, in actual practice, the anode-resonance in the typical single
3-500Z amplifier is closer to 130MHz,, so the reactance of Ls would be
lower and Ls would carry a slightly greater share of the current---and the
hole in Tom Rauch's opinion seems to grow larger.. OTOH, it can be argued
that the intrinsic VHF-R in nichrome would slightly decrease the current in
Ls.  ...........All things considered, significant current flows in Rs and
significant current flows in Ls.

On page 74 in the September, 1994 issue of QST, Tom Rauch states:

"The coil's reactance increases with frequency and at VHF most of the
signal path is through the resistor.  It is plainly evident that the
dominant component at VHF is the resistor, not the coil."
 (note: Mr. Rauch appears to use the word "coil" in place of the word inductor
)

 It is PLAINLY EVIDENT that neither Tom Rauch nor QST Editor Mark Wilson
took the humble minute necessary to perform the calculations to check the
validity of Tom's statement before it became a sorrowful chapter in QST
history.
 This easily-preventable blunder would NOT have happened in the days when
George Grammer, W1DF, stood watch over the technical reputation of QST
magazine.  According to those who knew him, George Grammer placed nothing
above technical accuracy.
--------------------------------------
e-mail copies to Mr. Rauch et al.

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:57:43 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
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From: [e-mail] (Tom R. Rice)
Subject: Re: ARRL lawyer to sue member
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]>
Date: Thu, 28 Nov 1996 18:23:38 GMT
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Sender: [e-mail]
Xref: news1.epix.net rec.radio.amateur.antenna:32144 rec.radio.amateur.digital.misc:20378 rec.radio.amateur.dx:1422 rec.radio.amateur.equipment:43211 rec.radio.amateur.homebrew:21490 rec.radio.amateur.misc:119002 rec.radio.amateur.policy:43564 rec.radio.amateur.space:8936

        Why is it that you never see lawyers at the beach?

        Because the cats keep covering them up with sand.

        73 de WB6BYH
--
"Start off every day with a smile and get it over with."  --W.C.Fields
Tom R. Rice
[e-mail]
CIS: 71160,1122


From [e-mail] Tue Dec 03 19:57:44 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: RF Parts FS
Date: Thu, 28 Nov 1996 20:54:48 GMT
Organization: Southwestern Bell Internet Services
Lines: 33
Message-ID: <57kmud$[e-mail]>
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"Junk Box Parts" for sale:

Email: [e-mail]
       After 12-5-96: [e-mail]

Amperex  OM350 RF Hybrid Amp  $5.00
CDL 30W 50Ohm   u-Wave Termination $10.00
Philips  BFQ34  RF Pwr Xsistor  $5.00
Plessey  SP4653 RF IC  $5.00
Plessey  SP6440 IC RF Mixer $5.00
Plessey  SL1362C RF Amp IC  $5.00
Mini Ckt LMX-148 Mixer  +10dBm LO $15.00
Mini Ckt RMS-2H  Mixer, +17dBm LO $5.00
Motorola SHW1045 Cell RF Pwr Amp $10.00
Motorola MHW807-1 CellRF Pwr Amp $12.00
Motorola MRF134   RF Pwr Mosfet  $15.00
Motorola MRF137   RF Pwr Mosfet  $19.00
Motorola MC12011P ECL PreScale    $5.00
Murata   MQC309-836  836Mhz VCO  $5.00
Murata   CFM455A IF Filter  $8.00
Toshiba  TD6105P 1Ghz Pre Scaler, $5.00
Toshiba  TD6107P 1Ghz Pre Scaler  $5.00
Toshiba  TD6110P 1Ghz Pre Scaler  $5.00
Toshiba  TD6112P 1Ghz Pre Scaler  $5.00
Toyocom  35P13   14.85Mhz Xtal Osc $5.00
Toyocom  69.9 Mhz 4Pole Xtal Filter $10.00
Sage  Wirelin Coupler, 6inch Flex   $15.00
Sage  Wireline Cplr, Semi-rigid 4"  $5.00
New Micros Forth U-contlr w/68HC11  $50.0





From [e-mail] Tue Dec 03 19:57:45 1996
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.audio.tubes,rec.antiques.radio+phono
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!demos!news.stealth.net!vixen.cso.uiuc.edu!howland.erols.net!netcom.com!wa2ise
From: [e-mail] (Robert Casey)
Subject: Vintage test equipment for sale, pick up in Bergen county NJ
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Distribution: usa
Date: Thu, 28 Nov 1996 20:56:21 GMT
Lines: 67
Sender: [e-mail]
Xref: news1.epix.net rec.radio.amateur.equipment:43223 rec.radio.amateur.homebrew:21496 rec.radio.amateur.misc:119020 rec.audio.tubes:18696 rec.antiques.radio+phono:32575


Vintage test equipment list:

Best offer, this stuff is heavy-probably not economical to ship
(unless you want something really bad! you pay shipping).
AS-IS condition, though I believe most everything was in operating
condition a few years ago, and since sat on shelves in a heated dry
room since then.
call me at 201-261-4066 or e-mail

Test Equipment for sale, pick-up in Bergen county NJ only

Manuf           model   description

General Radio:

                1215A   50-250mhz osc
                1216A   "IF amp"
                1214AS2 120c osc
                1214A   osc
                1209BL  180-600mhz
                1142A   freq meter descriminator
                650A    impedance bridge
                716B    capacitance bridge
                1210C   RC osc
                1604B   comparison bridge

Eico:
                368     TV-FM sweep gen
                232     vacuum tube voltmeter (vtvm)
                425     oscillscope

HP
                210A    square wave gen
                400AB   vtvm
                415B    standard wave indicator
                400     vtvm
RCA
                        senior voltohmest
                wv-97a  volt ohmest

Tektronix
                1A6     plug-in diff amp
                105     square wave gen
                180A    time mark gen
                RM122   low level preamp
                1A5     plug-in  diff amp

Triplet                 VOM
Premier         570A    signal gen
Freed transformer co 1110A inductance bridge
Gertch          pt-2    standard ratio transformer
Texscan         VS-80A  sweep gen
PRD             809A    klystron power supply
Kay             159B    multisweep gen
Signal Corps    R48/TRC-8  reciever 230-250MHz
Measurements    65P     signal gen
Jetronic        TS497C/URR   signal gen
MB electronics  N80     random noise gen
Digital         VT220   terminal
Collins         KWM-2A  HF transciever w/ powersupply $500

Heathkit        10-4101 TV vector scope
                2036    2m rig
                hm102   swr meter
                am2     swr meter



From [e-mail] Tue Dec 03 19:57:47 1996
From: Clifford Buttschardt <[e-mail]>
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Thu, 28 Nov 1996 15:15:50 -0800
Organization: Call America Internet Services  [phone]
Lines: 25
Message-ID: <[e-mail]>
References: <56bbbe$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <575asp$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: oso.slonet.org
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: Jay <[e-mail]>
In-Reply-To: <[e-mail]>
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-pen-16.sprintlink.net!cambridge.emi.net!andromeda.vec.net!cssun.mathcs.emory.edu!metro.atlanta.com!news.he.net!news.nacamar.de!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in2.uu.net!199.74.141.7!news.callamer.com!oso.slonet.org!cbuttsch
Xref: news1.epix.net alt.radio.digital:1639 rec.radio.amateur.digital.misc:20387 rec.radio.amateur.dx:1426 rec.radio.amateur.equipment:43240 rec.radio.amateur.homebrew:21501 rec.radio.amateur.misc:119035 rec.radio.amateur.space:8940 rec.radio.shortwave:89337 alt.ham-radio.packet:227

I've had the very same difficulty for weeks!  Cliff K7RR

On Wed, 27 Nov 1996, Jay wrote:

> [e-mail] (Dave Rickmers) wrote:
>
> >[e-mail] (Tim Smith) wrote:
> >
> >
> >>Can you tell me what the s/w is called and where I could d/l it?
> >>
> >>> http://www.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
> >>> ftp://ftp.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip   1032518
bytes
> >>>
> >>> sbfft11.zip     Sound Blaster spectral display and filtering
> >dr
> Is the software anywhere else on the net?? I can't connect to
> simtel.net for some reason. Netscape keeps giving me "no DNS entry"
>
> Thanks
> Jay
> [e-mail]
>
>



From [e-mail] Tue Dec 03 19:57:47 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in1.uu.net!165.87.194.248!news-m01.ny.us.ibm.net!news-s01.ny.us.ibm.net!not-for-mail
From: peter smit <[e-mail]>
Newsgroups: alt.radio.pirate,rec.radio.amateur.homebrew
Subject: wd: D2Mac coder!!
Date: Fri, 29 Nov 1996 08:11:18 +0800
Organization: hoogovens
Lines: 3
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: socksgate.uk.ibm.net
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Xref: news1.epix.net alt.radio.pirate:21420 rec.radio.amateur.homebrew:21517

I would like to buy a used D2Mac Coder (no decoder)

Peter Smit


From [e-mail] Tue Dec 03 19:57:48 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!feed1.news.erols.com!arclight.uoregon.edu!news.uoregon.edu!news.texoma.com!uunet!in1.uu.net!199.0.65.182!news-in.tiac.net!posterchild![e-mail]
From: "Dave" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: RCI2950:SOLD
Date: 29 Nov 1996 00:39:14 GMT
Organization: The Internet Access Company, Inc.
Lines: 2
Message-ID: <01bbdd8d$bbfd7da0$3bed77ce@ka1wgn>
NNTP-Posting-Host: p26.gw1.athol.ma.tiac.com
X-Newsreader: Microsoft Internet News 4.70.1155

THANKS
Dave,n1iqo


From [e-mail] Tue Dec 03 19:57:49 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!news.sgi.com!howland.erols.net!newsfeed.internetmci.com!newsrelay.courtave.net!news.localnet.com!usenet
From: [e-mail] (Nathan Roberts)
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood TS-690S
Date: 29 Nov 1996 01:33:12 GMT
Organization: LocalNet Corporation
Lines: 10
Message-ID: <57lego$[e-mail]>
NNTP-Posting-Host: ppp22.niag.localnet.com
X-Newsreader: WinVN 0.92.2

I would like any information on the Kenwood TS-690S that anyone may have.
In particular, the fix for transmitting between 30 and 49MHz and increasing
the TX power that has gone down due to another mod I did to gain extra transmi
t
coverage (removal of the D21 diode), I need this info mainly for a
transverter I plan on building.
 I would also appreciate any advise that anyone familiar with this model
could give me.

73's Nathan ([e-mail])



From [e-mail] Tue Dec 03 19:57:50 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.magicnet.net!feed1.news.erols.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.concentric.net!news-master!news
From: "Bruce C. Raisley A.R.S. N9ZLE" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: SSTV,FAX,RTTY,CW plus much more
Date: Thu, 28 Nov 1996 22:29:42 -0500
Organization: SkyMaster products
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: cnc035054.concentric.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.01Gold (Win95; I)

If you wanted to get in to SSTV and always thought it was just
too much cash, check out this page:

http://www.cris.com/~n9zle/hc.html

Christmas sale going on now!
                                Bruce


From [e-mail] Tue Dec 03 19:57:51 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!208.6.192.243!news.magicnet.net!news.cdsnet.net!usenet
From: Lee Eschen <[e-mail]>
Newsgroups: alt.radio.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.shortwave,alt.ham-radio.binaries,alt.ham-radio.am,alt.ham-radio.amtor,alt.ham-radio.digital-voice,alt.ham-radio.dxing,alt.ham-radio.eme,alt.ham-radio.spread,alt.ham-radio.exotic-modes,alt.ham-radio.fax,alt.ham-radio.fm,alt.ham-radio.hf,alt.ham-radio.nocode,alt.ham-radio.slowscan,alt.ham-radio.packet,alt.ham-radio.ssb,alt.ham-radio.uwave,alt.ham-radio.morse,alt.ham-radio.vhf-uhf,alt.ham-radio.rtty
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Thu, 28 Nov 1996 21:01:28 -0800
Organization: Ashgrove
Lines: 35
Message-ID: <[e-mail]>
References: <56bbbe$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <575asp$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: cj-0019.dip.cdsnet.net
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Content-Type: text/plain; charset=us-ascii
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Xref: news1.epix.net alt.radio.digital:1641 rec.radio.amateur.digital.misc:20392 rec.radio.amateur.dx:1430 rec.radio.amateur.equipment:43264 rec.radio.amateur.homebrew:21511 rec.radio.amateur.misc:119061 rec.radio.amateur.space:8943 rec.radio.shortwave:89361 alt.ham-radio.packet:228

Clifford Buttschardt wrote:
>
> I've had the very same difficulty for weeks!  Cliff K7RR
>
> On Wed, 27 Nov 1996, Jay wrote:
>
> > [e-mail] (Dave Rickmers) wrote:
> >
> > >[e-mail] (Tim Smith) wrote:
> > >
> > >
> > >>Can you tell me what the s/w is called and where I could d/l it?
> > >>
> > >>> http://www.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip
> > >>> ftp://ftp.simtel.net/pub/simtelnet/msdos/hamradio/sbfft11.zip   103251
8 bytes
> > >>>
> > >>> sbfft11.zip     Sound Blaster spectral display and filtering
> > >dr
> > Is the software anywhere else on the net?? I can't connect to
> > simtel.net for some reason. Netscape keeps giving me "no DNS entry"
> >
> > Thanks
> > Jay
> > [e-mail]
> >
> >

I just got it using Netware 3.01 with no problems whatever. Try again!

-- N6AXB in Cave Junction, Orygon.
--------------------------------------------------------------------
Lee, of the Independent Republic of Jefferson: ([e-mail])
  We laugh at honor and are shocked to find traitors in our midst.
                                          -C. S. Lewis
--------------------------------------------------------------------


From [e-mail] Tue Dec 03 19:57:52 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in3.uu.net!206.67.134.2!hst1us.satlink.com!satlink!un3.satlink.com!barrancas.com!juan
Subject: TX CW
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Fri, 29 Nov 96 01:23:01 EST
Message-ID: <[e-mail]>
Organization: BARRANCAS - [phone]
Lines: 12


DESEO ARMAR UN TRANSMISOR DE TELEGRAFIA PARA LA BANDA DE 80 METROS DE
BAJA POTENCIA A TRANSISTORES.
SI ALGUIEN POSEE UN CIRCUITO PRACTICO DE UN TRANSMISOR DE CW, LE
AGRADECERIA ME LO ENVIEN POR ESTE MEDIO O A MI DIRECCION PARTICULAR,
DESDE YA MUCHAS GRACIAS.

LU 3 EGX
JUAN F. MAZZARELLA
ARAOZ  847 (2942) BARADERO
BUENOS AIRES
ARGENTINA.


From [e-mail] Tue Dec 03 19:57:53 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in2.uu.net!192.220.251.22!netnews.nwnet.net!news-hub.interserv.net!news.sprynet.com!news
From: "'Net Crusier" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Antenna Idea!
Date: 29 Nov 1996 07:10:10 GMT
Organization: Sprynet News Service
Lines: 14
Message-ID: <01bbdc30$3b1b33c0$[e-mail]>
NNTP-Posting-Host: ad40-165.compuserve.com
X-Newsreader: Microsoft Internet News 4.70.1155

I have an idea. Why not connect a quarterwave antenna to the input of a 1w
(homebrew) amplifier and then connect the output of that to a regular 35w
amplifier and connect the output of that to a really good antenna.  That
way, I could be walking around with my Handie Talkie and have the benefit
of the really good antenna .


Would this work?

How about making a pipe to fit around the HT's antenna so I don't have to
disconnect it?

EMAIL your responses to me.
THANKS! 73!


From [e-mail] Tue Dec 03 19:57:54 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in2.uu.net!192.220.251.22!netnews.nwnet.net!news-hub.interserv.net!news.sprynet.com!news
From: "'Net Crusier" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Tuning and SWR meters
Date: 29 Nov 1996 07:10:13 GMT
Organization: Sprynet News Service
Lines: 3
Message-ID: <01bbdc35$01d786e0$[e-mail]>
NNTP-Posting-Host: ad40-165.compuserve.com
X-Newsreader: Microsoft Internet News 4.70.1155

Can I determine if a antenna is tuned and has the lowest SWR by listening
to the static on an unused frequency?



From [e-mail] Tue Dec 03 19:57:55 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in2.uu.net!192.220.251.22!netnews.nwnet.net!news-hub.interserv.net!news.sprynet.com!news
From: "'Net Crusier" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Linling radios together
Date: 29 Nov 1996 07:10:17 GMT
Organization: Sprynet News Service
Lines: 18
Message-ID: <01bbdc35$f034f340$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ad40-165.compuserve.com
X-Newsreader: Microsoft Internet News 4.70.1155



Charles <[e-mail]> wrote in article
<[e-mail]>...
> Does anyone have a diagram to connect two vhf radios together using the
> mic connections only to make a temperary repeater for emergency use?????
>
> Any sugestions would be appreciated.
>
>
> Thanks
>
> Charles    KD4HHX
>

Couldn't you attach a VOX device from one transceiver's earphone outlet to
the other's PTT & mic and vice versa?



From [e-mail] Tue Dec 03 19:57:56 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsfeed.internetmci.com!in2.uu.net!158.250.39.26!Gamma.RU!srcc!news.uni-stuttgart.de!rz.uni-karlsruhe.de!rzstud3.rz.uni-karlsruhe.de!ubas
From: [e-mail] (Ralf Haueisen)
Newsgroups: rec.radio.amateur.homebrew
Subject: How to get QST?
Date: 29 Nov 1996 07:57:47 GMT
Organization: University of Karlsruhe, Germany
Lines: 8
Message-ID: <57m51r$[e-mail]>
NNTP-Posting-Host: rzstud3.rz.uni-karlsruhe.de
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
NNTP-Posting-User: ubas
X-Newsreader: TIN [version 1.2 PL2]

Hello.

How can I get the QST magazine?

73, Ralf, DF1IAZ

--
Ralf Haueisen  ***  eMail [e-mail]


From [e-mail] Tue Dec 03 19:57:57 1996
Message-ID: <[e-mail]>
Date: Fri, 29 Nov 1996 03:34:17 -0800
From: "Richard F. Gillette" <[e-mail]>
Reply-To: [e-mail]
Organization: RF gillette inc.
X-Mailer: Mozilla 3.0 (Win16; I)
MIME-Version: 1.0
Newsgroups: rec.radio.amateur.homebrew
To: [e-mail]
Subject: Re: Yaesu mic. pinout
References: <572vrs$1rlo$[e-mail]>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
NNTP-Posting-Host: max02-132.starnetinc.com
Lines: 49
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!news.sprintlink.net!news-peer.sprintlink.net!uunet!in2.uu.net!204.178.185.19!news1.starnetinc.com!max02-132.starnetinc.com

tim wrote:
>
> Hello,
>  I need the pinout of an Yaesu mic. mod# MD-1 c8  to adapt it to an Icom rad
io
> thanks in advance   Tim Phillips KF4FCO-EM-70
>
>               Tim KF4FCO-EM70 Spamless Ham REPLY WITH CARE
>              I'AM PC HANDICAPED AND I TYPE WITH TWO FINGERS
>               AND I SUFFER FROM LAP TOP FEVER!!!!!!!!!!!!!!
>              :*********************************************]
See FT767GX op manual page 9.

a side

6 red to ppt sw    ppt spst
7 black gnd
8 white audio

radio side

1 orange up         up/down/fast spst
2 yellow green up & down return
3 blue down
4 brown fast
5 ?     fast return
6 red ppt lock & pin 6 a side   ppt lock spst
7 black  gnd & ppt return & pin 7 a side
8 ?      common of 600/50k sw

600 ohm side  of sw  to tone select sw common & transformer low z
output (return to ground) & via cap. (value not listed) to pin 8 a side

50k ohm side of sw to xformer high Z input (return to ground)

tone sw pos 1 shorts cap
tone sw pos 2 inductor to gnd & cap unshorted (inductor value not
listed)
tone sw pos 3 taps inductor ( same as 2 but less l)

I do not have one, but it looks like so, 3 connectors

            1                                 2 3

radio side  >8 of 8 pines used-----------------> >3 of 8 pins used
             Z/tone/up/down/fast sws/circuit       mic/ppt sw
--
Richard F. Gillette P.E.,   Board Member, Harper C.C.     \\////
RF gillette inc. PO Box 1605, Palatine, IL 60078-1605     ( OO )
[e-mail], v)847-526-2626, f)847-526-2944 oo00=={}==00oo=


From [e-mail] Tue Dec 03 19:57:58 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Linling radios together
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <01bbdc35$f034f340$[e-mail]>
Date: Fri, 29 Nov 1996 11:47:19 GMT
Lines: 64

In article <01bbdc35$f034f340$[e-mail]> "'Net Crusier" <cajuncr
[e-mail]> writes:
>Charles <[e-mail]> wrote in article
><[e-mail]>...
>> Does anyone have a diagram to connect two vhf radios together using the
>> mic connections only to make a temperary repeater for emergency use?????
>>
>> Any sugestions would be appreciated.
>
>Couldn't you attach a VOX device from one transceiver's earphone outlet to
>the other's PTT & mic and vice versa?

Yeah, you sure can, and you don't need the vice versa, one radio acts as
the repeater receiver, the other as the transmitter. You only need cross
coupling for a crossband repeater where each side has to alternately
transmit.  For ordinary in-band repeating, one VOX will do it. (It's
better to attach internally to pick up squelch break, IE a COR signal,
but the VOX will suffice for expedient use if you set VOX delay to a
long value, IE a long tail time for the repeater. Otherwise the repeater
may chatter in and out of transmit as the operators pause to draw a
breath.)

Just make sure the radios are well separated from each other, and their
antennas are even better separated from each other to avoid desense. A
few hundred feet horizontally, or 10-20 feet vertically, will suffice at
HT power levels. For mobile rig power levels, you'll need much more
separation, like a couple of miles horizontally or several hundred feet
vertically, or you can use some good cavity filters, IE like those in a
repeater duplexer. (You can just *use* a repeater duplexer, and that'll
let you use a single antenna too.) Remember, however, that the cavities
have to be precisely tuned to the pair of frequencies you're using.
You can't QSY without retuning the cavities.

Be sure to ID the repeater. Ideally, you'll have an IDer in the
interface, but you can also just make sure to transmit through the
repeater at least once every 10 minutes and ID yourself and the
repeater. Unless you want to include a remote control link (on
222 MHz or above), you'll want to operate the repeater under local
control. You may want to parallel in a local microphone so you
can use the repeater as your station too.

You can buy a commercial interface to do this (advertised in the
ham magazines), or you can easily build it yourself. It's a nice
little project to have in your emergency kit. Make up a bunch of
different cables to fit various brands of radios, and you'll be
able to quickly cobble up an expedient repeater from any pair of
radios which are at hand.

A final note here. While such an expedient repeater is pretty
simple to rig up, there are some caveats. Of course you have
to pick a pair of frequencies in the repeater subband to use
it, and you really need to be aware of other repeaters using
that pair (and adjacent pairs) in the area. Otherwise you may
set up an untenable interference situation. Using a rig which
offers crossband repeating is often a more viable approach
since separation issues become moot, as do interfacing issues.
But again, you have to be aware of other repeaters, this time
on *both* bands, to avoid causing (or receiving) harmful interference.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Dec 03 19:57:59 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: How to get QST?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <57m51r$[e-mail]>
Date: Fri, 29 Nov 1996 11:52:15 GMT
Lines: 18

In article <57m51r$[e-mail]> [e-mail]-karlsruhe
.de (Ralf Haueisen) writes:
>
>How can I get the QST magazine?
>
>73, Ralf, DF1IAZ

Join the ARRL. See their web page, www.arrl.org, for membership
details. If you want overseas first class delivery rather than
bulk mail, that costs extra. QST is now also available on newsstands,
so you might check with magazine distributors in your area to see if
you can get it that way (it costs more that way though).

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Dec 03 19:58:01 1996
Message-ID: <[e-mail]>
Date: Fri, 29 Nov 1996 04:03:34 -0800
From: "Richard F. Gillette" <[e-mail]>
Reply-To: [e-mail]
Organization: RF gillette inc.
X-Mailer: Mozilla 3.0 (Win16; I)
MIME-Version: 1.0
Newsgroups: rec.radio.amateur.homebrew
To: Brian Kline <[e-mail]>
Subject: Re: Transformer For Power Supply
References: <[e-mail]> <[e-mail]>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
NNTP-Posting-Host: max02-132.starnetinc.com
Lines: 38
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!phase2.worldnet.att.net!uunet!in2.uu.net!204.178.185.19!news1.starnetinc.com!max02-132.starnetinc.com

Brian Kline wrote:
>
> Dave Morrow wrote:
> >
> > I'm trying to build a 13.8v 20amp power supply and I'm having difficulty
> > locating a transformer. This project may be more difficult than I
> > thought. I'm looking for a 120v primary and 20v - 25v 10amp secondary or
> > something close. Of the places I've called they don't carry it or they
> > want $200.00 for it.
> >
> > Any words of advise? Any ideas as to where to find a transformer at a
> > cut rate price?
> >
> > Help!!
> > Thanks, Dave
>
If you can find 5v. 20a. power supplies cheep (most ham fests
have them) look at using 3 in seties with their outpur adjusted
to 4.5/6 v. (3 times 4.57 = 13.71v).  Keep all floating from
chassis except the return of the first one.


110  >>   4.57  + 13.7v  >
                -
                | jumper
110  >>   4.57  +
                -
                | jumper
110  >>   4.57  +
                - gnd    >

I have used same for club station and has worked without problems
for the last 3 years.  I used 3 @ 5v 35a and it feeds 2mtr/440 35w
100W hf and tnc.   73 W9PE
--
Richard F. Gillette P.E.,   Board Member, Harper C.C.     \\////
RF gillette inc. PO Box 1605, Palatine, IL 60078-1605     ( OO )
[e-mail], v)847-526-2626, f)847-526-2944 oo00=={}==00oo=


From [e-mail] Tue Dec 03 19:58:03 1996
Message-ID: <[e-mail]>
Date: Fri, 29 Nov 1996 04:18:49 -0800
From: "Richard F. Gillette" <[e-mail]>
Reply-To: [e-mail]
Organization: RF gillette inc.
X-Mailer: Mozilla 3.0 (Win16; I)
MIME-Version: 1.0
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematic Drawing Software For Ham Use?
References: <01bbd944$0ba84040$[e-mail]> <[e-mail]>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
NNTP-Posting-Host: max02-132.starnetinc.com
Lines: 44
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!204.178.185.19!news1.starnetinc.com!max02-132.starnetinc.com

[e-mail] wrote:
>
> In article <01bbd944$0ba84040$[e-mail]>, "A Redshirt"
> <[e-mail]> writes:
>
> >Hello.
> >
> >Any suggestions on what is available/where to find a software
> >package that I can use to replace the endless drawings I have
> >"created"  on the back side of Safeway market bags et al over
> >the years?
> >
> >I do not need the functionality of transferring the drawings to
> >four-sided PC board layouts, or anything as fancy as that;
> >I'm just looking for a way to clean up and file a lot of loose
> >sketches, and document some of junk I have "invented" (?!)
> >over the last thirty years or so.
> >
> >I assume that the library of "gadgets" or "elements" would
> >be of some importance also.  And I can relate to the terms
> >such as Condenser and Kilocycle.
> >
> >I'd appreciate your comments...
> >
> >Thanks
> >
> >de John
> >A Redshirt in Rocklin
> >"HILLARY SHOT VINCE!!"

KeyCAD Complete 29.95 from Softkey 407-367-1415 is a complete
cad program.  The CDROM version has a large number of libraries
electric/plumbing/etc.  You can also add to the library yourself
or buy same from them.  It will do layers if you need them, as it
is a full cad drafting program it can scale, replicate , etc.

Comes in both DOS and MAC flavors.

73 W9PE

--
Richard F. Gillette P.E.,   Board Member, Harper C.C.     \\////
RF gillette inc. PO Box 1605, Palatine, IL 60078-1605     ( OO )
[e-mail], v)847-526-2626, f)847-526-2944 oo00=={}==00oo=


From [e-mail] Tue Dec 03 19:58:04 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!feed1.news.erols.com!howland.erols.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Bob Ant)
Newsgroups: rec.radio.amateur.homebrew
Subject: BUSINESSEEK.COM
Date: 29 Nov 96 13:35:06 GMT
Organization: ucsd usenet gateway
Lines: 43
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


Hi.
Excuse me for this unsolicited e-mail. I felt this was the
best way to inform you of our new service.

Here at PERSONALSEEK, www.personalseek.com, we've decided to build ì
another free international search engine,but this one is only for ì
commercial organizations. It is called BUSINESSEEK and it's absolutely ì
free. Try it for yourself at http://www.businesseek.com/

The goal of Businesseek is to allow the user to find a company, brand or ì
product quickly and easily. We will provide your company with a password ì
so you can update your data instantly and at any time that is convenient ì
for you.

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same information in other languages depending on the markets that you ì
would like to serve. There are no limits regarding the number of ì
submissions. The information intake form will be available in english ì
spanish,italian, french and german.

We also have a COMPANY NEWS OF BUSINESSEEK section, where you will be ì
able to put up to 1000 text characters text giving news about your ì
company.You can describe new products or brands, new researches, etc., ì
using the password we'll give you after you add your data.

To add your data, go to add in
http://www.businesseek.com/
After you have your password, you can acces our news service at ì
http://www.businesseek.com/business/news


Yours sincerely.

Bob Ant
Webmaster of BusinesSeek
Webmaster of PersonalSeek

--
"Never has something so little gone so fast..."





From [e-mail] Tue Dec 03 19:58:05 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!204.71.1.48!newsfeed.internetmci.com!iol!usenet
From: Tony <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ShortWave transmitter wanted
Date: 29 Nov 1996 13:59:18 GMT
Organization: Ireland On-Line
Lines: 12
Message-ID: <57mq7m$[e-mail]>
NNTP-Posting-Host: dialup-011.limerick.iol.ie
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22KIT (Windows; I; 16bit)

If anybody knows where abouts I can obtain a Secondhand
broadcast transmitter?

100-200watt approx.


Mail Tony G.


[e-mail]




From [e-mail] Tue Dec 03 19:58:07 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.erols.net!feed1.news.erols.com!phase2.worldnet.att.net!uunet!in1.uu.net!205.228.248.26!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 29 Nov 1996 07:34:06 -0700
Organization: Internet Access of Ventura County
Lines: 53
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port0.vcnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <[e-mail]>, [e-mail]
wrote:

> Yes, I have the time to talk to Mr. Miklos and others.

 Mr. Miklos needs to speak for Mr. Miklos.   Mr. Rauch proffers the story
that Mr. Miklos can't get on the Internet until January.  I am on ISP
number three.  It takes me about an hour to get set up with a new ISP---and
I am no computer genius by any means.  Apparently, Mr. Rauch does not even
know Miklos' first name or the name of Miklos' ex-supervisor at
Varian-Eimac's Salt Lake City div.  Hmmm.  I suspect that the story about
Miklos is a Rauchian ruse to play for time---like the "Tom:  does the
AL-1500 amplifier use a VHF suppressor?" issue. Tom knows that if he
answers yes, then I am going to point out that he said a parasitic
suppressor was not needed in an 8877 amplifier.   Mr. Rauch knows full well
that eventually I will tire of stalling, bs, and hogwash---whereupon I will
bail out---whereupon Mr.Rauch will proudly proclaim a draw.   //  BTW,
Carl, would you like to take a wild guess whether or not Rauch's AL-1500
amplifier uses a VHF suppressor?

> The 572B's were installed and all appeared OK. I was not
> there when they failed.
snip
> the 4 Penta's output was a little low but not enough to be concerned with.
> My customer still has the old tubes and if I get a chance I'll check them
> out.
snip
> I wish I could tell you more.

Did the customer report hearing a noise at the time the tubes died?  If you
do not recall whether you noticed the filaments lit up in the dead tubes,
Carl, then we will have to wait for the second encounter.

I have heard that the newer 572Bs have a somewhat higher mu than the Cetron
and RCAs.  One indication of higher mu is if you see a change in input SWR
when the new tubes are in use.  The higher the mu, the less cathode to
filament RF voltage is needed to drive the tubes to the same cathode
current.  Thus, the driving Z decreases with higher mu tubes, and that
affects input SWR.  With a solid-state driver, higher input SWR means less
RF out, so output from the amplifier should decrease accordingly.
 Higher mu also means higher gain, which means more ability to oscillate.
RF Parts is reportedly aware that the failure of Penta 572Bs in SB-200s is
parasitic-related.  Cetron tubes are not a sure cure, either.  I have heard
of a number of SB-200 owners who had the bandswitch's Wafer A contacts for
the 100pF tune-cap. padder, burn up from parasitic arcing when brand new
Cetrons were installed.  The next time you work on a SB-200 with sudden
tube failure or a burned bandswitch, take a dipmeter and check the VHF dip
at the 1000pF, 5kV  DC blocking capacitor.  Is the dip sharp or broad?
-----------------------------
e-mail copy to Carl, N9EFJ

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:58:08 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!cam-news-hub1.bbnplanet.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!nic.win.hookup.net!vertex.tor.hookup.net!nic.mtl.hookup.net!rcogate.rco.qc.ca!altitude!usenet
From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.dx,rec.radio.amateur.homebrew
Subject: DDRR & antenna pictures - DX
Date: Fri, 29 Nov 1996 10:28:26 -0500
Organization: ORION Microsystems
Lines: 29
Message-ID: <[e-mail]>
NNTP-Posting-Host: dynamicppp-3.hip.cam.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)
Xref: news1.epix.net rec.radio.amateur.antenna:32173 rec.radio.amateur.dx:1433 rec.radio.amateur.homebrew:21532

They are here at last!

Now you can see what real DDRRs looks like.

You can also read about VE2DLJ tests and QSOs using
these DDRRs in the 75m DX Windows.

If you work DX on the low bands you certainly know the big guns
from VE2. Wonder what they use ? Check the pictures and you will
understand.

Report of the comparative tests between all sorts of Low Band
antennas (beam, rot. dipole, 4 square, wire beam, DDRRs, K5RP, etc)

Also in these pages:

Lots of selected links for hamradio, electronics, manufacturers,
components, propagation, searching for specs, etc...

Download NEC4WIN Antenna simulation for Windows (evaluation)

       URL : http://www.CAM.ORG/~mboukri

If you don't find something, or need more info, send me an
email and I will be glad to help you.

-------------------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows


From [e-mail] Tue Dec 03 19:58:09 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.idt.net!feed1.news.erols.com!phase2.worldnet.att.net!uunet!in3.uu.net!192.174.65.41!01-newsfeed.univie.ac.at!02-newsfeed.univie.ac.at!news.ecrc.de!news.mch.sni.de!horus.mch.sni.de!news
From: [e-mail] (Gerhard Wolters)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: TH-79A(D) 800Mhz
Date: 29 Nov 1996 15:35:04 GMT
Organization: SNI
Lines: 10
Message-ID: <57mvr8$[e-mail]>
References: <01bbda7a$b8a7ca90$0a66f0c6@general> <01bbdaed$d2e44460$fe7174cf@default> <01bbdb45$e43e86f0$2f3960cf@general>
NNTP-Posting-Host: driburg.pdb.sni.de
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11
Xref: news1.epix.net rec.radio.amateur.equipment:43286 rec.radio.amateur.homebrew:21534 rec.radio.amateur.misc:119105

In article <01bbdb45$e43e86f0$2f3960cf@general>, [e-mail] says...
>
>So your saying TH-79E recieves 800Mhz?
>
HI
Yes, it does!(from 800-999 MHz)
BTW with excellent sensitivity.
73 de Gerd DJ6YB
owner of TH79-E



From [e-mail] Tue Dec 03 19:58:11 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!EU.net!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!132.175.109.6!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: "David B. Holtkamp" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: TL-922 Arcing/Oscillating? Help w/Diagnosis?
Date: 29 Nov 1996 16:20:49 GMT
Organization: The Santa Fe Institute
Lines: 59
Message-ID: <01bbde0e$99e12c40$[e-mail]>
NNTP-Posting-Host: dial139.roadrunner.com
X-Newsreader: Microsoft Internet News 4.70.1155

I have a several year old TL922A (mod for 10 m) and I've been having some
trouble with it arcing (or oscillating - can't tell which). The details are
in the next paragraphs, and I'd appreciate any help/suggestions on what to
try next.

When I got the TL922 (from a silent key's estate), I noticed that the plate
capacitor exhibited arcing damage - the position corresponded to a lower
capacitance setting (little capacitor area active).  The arcing had pitted
and melted part of one of the plates (the fixed position one). I cleaned it
up as best as I could (filed off, smoothed and straightened the plates,
etc.)  I used it for several more months and then it began arcing more or
less steadily whenever I tried to tune up.  I usually operate SSB with the
HV setting on the lower (CW) setting in the amp. I don't push the amp
particularly hard - usually running about 500 w out.  Our altitude here is
about 7000 feet so HV may have a little more trouble with arcing than at
sea level, but I'm not sure that this is a contributing factor.

I replaced the tuning cap with a new one from Kenwood (~$120!!) and hoped
that my problem was solved . I figured that the arcing was due to surface
roughness and pitting that I really couldn't fix and I hoped that the new
one would solve my problem.

Well, as you may have gathered by now, it has started arcing again.  I'm
very careful to tune it into a nice low SWR load (G5RV + tuner or a 5 el
log periodic), but I have problems with arcing at full output (~600 w) on
160m and somethimes the higher bands (15 and 20 in particular).

I also found earlier that trying to use SSB on the SSB HV position would
almost invariably cause arcing so I don't even try to use the higher
voltage settings.  I can always tune it up successfully at low power 200 w
or so, but then why bother with an amp?

I've seen AG6K's material on his web pages (Thank you!), but I'm not sure
that VHF parasitics are the cause of my problems (although they may very
well be!).  I've looked elsewhere on the web with little luck (so any
pointers to other sources would be appreciated).

So the following questions come to mind:
1) am I "arcing" or suffering from VHF parasitics? How can I tell the
difference?
2) I haven't suffered (I think) any damage to tubes or resistors or other
components in the TL922 (yet) - should I be on the lookout for other
damage? What should I look for?
3) Can this problem be aggravated by RF in the shack? I have a modest
amount of it I'm sure...
4) Should I pass on the TL922 and buy a more modern design? If so, what is
the recommendation?

Thanks in advance for all your help!!!

  Best regards,

  David Holtkamp (K5KH)

PS Sorry to repost, but I was afraid that the Subject field was messed up.

  email: [e-mail]




From [e-mail] Tue Dec 03 19:58:11 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in3.uu.net!204.191.213.61!ott.istar!istar.net!tor.istar!east.istar!virginia.bmts.com!primeline.net!tait
From: Gary Tait <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Touch lamp noise
Date: Fri, 29 Nov 1996 11:36:13 -0500
Organization: Bruce Municipal Telephone System
Lines: 18
Message-ID: <[e-mail]>
References: <57mro4$[e-mail]>
NNTP-Posting-Host: ns.primeline.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: David Robbins <[e-mail]>
In-Reply-To: <57mro4$[e-mail]>

On Fri, 29 Nov 1996, David Robbins wrote:

#My XYL bought a pair of touch lamps last week, and they generate an S8
#noise level, even when they are turned off.  They turn off and on when
#I transmit.
#
#Has anyone had any luck eliminating these problems.
#
#Thanks for any help.
#
#David, KA4IKH
#

Get rid of the touch modules.

Gary Tait , VE3VBF
- Please do not quote US prices, they are no good to me ,here in Canada -



From [e-mail] Tue Dec 03 19:58:12 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!in1.nntp.cais.net!van-bc!news.mindlink.net!sol.ctr.columbia.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.wwa.com!news
From: Bigdad <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Icom IC-230 accessory connector
Date: 29 Nov 1996 18:17:55 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
Lines: 4
Message-ID: <57n9cj$[e-mail]>
NNTP-Posting-Host: 206.230.95.11
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Hi all....im in need of the pinout of the accessory connector on
the side of the ICOM IC-230 2m radio...hope someone can help me
out...thanks!



From [e-mail] Tue Dec 03 19:58:13 1996
From: [e-mail] (Don Phelps)
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.fibr.net!news-out.internetmci.com!newsfeed.internetmci.com!miwok!infoway!don.phelps
Newsgroups: rec.radio.amateur.homebrew
Subject: Touch lamp noise
Message-ID: <[e-mail]>
Date: Fri, 29 Nov 1996 18:41:16 GMT
Distribution: world
Organization: The Infoway BBS [phone] 28,800 8-N-1
Lines: 21


 Ek> My XYL bought a pair of touch lamps last week, and they generate an S8
 Ek> noise level, even when they are turned off.  They turn off and on when
 Ek> I transmit.

 Ek> Has anyone had any luck eliminating these problems.

 David,
 Divorce is the normal method.
 Other than that, you could give her a special present of
 a dozen roses, a night out on the town, much flattery
 and a pair of twist knob lamps with 3-way light bulbs.
 Dimmers, XR-10 controllers, florescent lights, and
 especially touch lamps, should be carefully eliminated
 from a ham's QTH.

Don, N6MCE


... [e-mail]  1:125/104 POBox 9739 San Rafael,CA 94912
___ Blue Wave/386 v2.30 [NR]


From [e-mail] Tue Dec 03 19:58:14 1996
Path: news1.epix.net!news3.epix.net!info.cs.uofs.edu!news.ultranet.com!zombie.ncsc.mil!newsgate.duke.edu!news.duq.edu!newsfeed.pitt.edu!portc02.blue.aol.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!news.mindspring.com!usenet
From: [e-mail] (David Robbins)
Newsgroups: rec.radio.amateur.homebrew
Subject: Touch lamp noise
Date: Fri, 29 Nov 1996 19:25:08 GMT
Organization: MindSpring Enterprises, Inc.
Lines: 10
Message-ID: <57mro4$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip158.raleigh2.nc.interramp.com
X-Server-Date: 29 Nov 1996 14:25:08 GMT
X-Newsreader: Forte Free Agent 1.0.82

My XYL bought a pair of touch lamps last week, and they generate an S8
noise level, even when they are turned off.  They turn off and on when
I transmit.

Has anyone had any luck eliminating these problems.

Thanks for any help.

David, KA4IKH



From [e-mail] Tue Dec 03 19:58:15 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!phase2.worldnet.att.net!uunet!in1.uu.net!199.0.65.182!news-in.tiac.net!posterchild![e-mail]
From: "Dave" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 2SC2312 ?
Date: 29 Nov 1996 19:33:28 GMT
Organization: The Internet Access Company, Inc.
Lines: 14
Message-ID: <01bbde2c$308d1420$2ded77ce@ka1wgn>
NNTP-Posting-Host: p12.gw1.athol.ma.tiac.com
X-Newsreader: Microsoft Internet News 4.70.1155

Hi all,

        I need some information on the 2SC2312.
        I have a project in the works and I need
        the data sheet on this transistor.
        If you can help please E-MAIL me.
        or post

Thank You

Dave,n1iqo

[e-mail]



From [e-mail] Tue Dec 03 19:58:16 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsxfer2.itd.umich.edu!phase2.worldnet.att.net!newsadm
From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Front Panel Graphics
Date: Fri, 29 Nov 1996 16:04:35 -0500
Organization: AT&T WorldNet Services
Lines: 20
Message-ID: <[e-mail]>
NNTP-Posting-Host: 207.116.145.150
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; I)

Here's a really easy way to produce exceptionally professional looking
front panel graphics for your next homebrew project.
Use your favorite computer presentation or paint program to design the
front panel on your computer (I like Microsoft's Powerpoint, but there
are many others that do a fine job). Use fonts, shading, and color to
get just the right look. Use your inkjet color printer to print the
newly designed graphic onto ordinary paper. Laminate the paper printout
using clear adhesive backed vinyl laminating material which is available
at any office supply store. Cut out the graphic to fit the panel. Apply
a light coat of aerosol adhesive (also available at your office supply
store) to the surface which will receive the graphic, then apply the
laminated graphic and gently rub the entire surface using a soft cloth
to ensure a good bond. Trim off any excess material using an exacto
knife.

This method produces very high quality, durable front panel overlays
without the mess and frustration of paints, decals, or rub-ons.

Joe
WA3CMQ


From [e-mail] Tue Dec 03 19:58:17 1996
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From: "A Redshirt" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member (another twist...)
Date: 29 Nov 1996 21:14:17 GMT
Organization: "Credo Quia Absudum" -- E Clampus Vitus
Lines: 20
Message-ID: <01bbde38$321b37c0$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]> <[e-mail]>
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Lifted from the local paper without permission, and forwarded
without comment...

"The parents of 4-year-old Sarah Engstrand filed a US $1.2
million
lawsuit in New York City against the girls' grandparents because
the elder couple's Akita dog, Becky Bear, bit and deeply scarred

Sarah's nose and cheek during the girl's birthday party in 1994.
The grandparents are heartsick at being sued by their own son,
who not surprisingly is a lawyer, as is his wife."

A Redshirt in Rocklin

"HILLARY SHOT VINCE!!" - A Local Bumper Sticker
--





From [e-mail] Tue Dec 03 19:58:18 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon
From: [e-mail] (Leon Heller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Touch lamp noise
Date: Fri, 29 Nov 96 22:04:30 GMT
Organization: Home
Lines: 19
Message-ID: <[e-mail]>
References: <57mro4$[e-mail]>
Reply-To: [e-mail]
X-Mail2News-User: [e-mail]
X-Mail2News-Path: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <57mro4$[e-mail]>
           [e-mail] "David Robbins" writes:

> My XYL bought a pair of touch lamps last week, and they generate an S8
> noise level, even when they are turned off.  They turn off and on when
> I transmit.
>
> Has anyone had any luck eliminating these problems.

I think there was something about this type of lamp in the EMC pages of
Radcom a few months ago. I don't think they came up with a solution; the
supplier accepted them as being faulty, and made a refund.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.



From [e-mail] Tue Dec 03 19:58:19 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!newsfeed.internetmci.com!in2.uu.net!205.228.248.26!news.vcnet.com!measures
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KISS
Date: Fri, 29 Nov 1996 15:41:17 -0700
Organization: Internet Access of Ventura County
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: port44.vcnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
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X-Newsreader: Yet Another NewsWatcher 2.3.1

In article <[e-mail]>,
[e-mail] (R. L. Measures ) wrote:

> In article <[e-mail]>, [e-mail] wrote:
>
>
> > AG6K math in calculating R/L current percentages on straight sum is WRONG!
>
> Please show us the CORRECT solution, Mario.
>
Mario's solution never made it my news server, but Mario IS mathematically
correct according to what I read in the Will's archive---provided that the
currents are 90 degrees out of phase..  I was wrong for not considering
that the currents are out of phase.  Comgrats, Mario.  I am surprised that
one of the "recognized amplifier experts" didn't catch my error.  (see 9/94
QST, page 71 column 3)

However,  in actual practice, the currents are somewhat less than 90
degrees apart due to the intrinsic L in the suppressor resistor, Rs, and
due to the intrinsic VHF R in the suppressor inductor, Ls.  For Rs, the
resistor we use in our retrofit kits has around 18nH and 30 ohms of R.  At
100 MHz 18nH has 12 ohms of reactance.  Thus, the I phase angle in Rs is
arctan 12/30= minus 21.8 degrees at 100MHz.  The I phase angle in the
inductor is anybody's guess, but minus 80 degrees is probably close.

Since we don't know the phase angle between the currents, perhaps the best
solution is to state the ratio of the currents.  Thus, the ratio of the
currents through Rs and Ls is fairly close to unity. ........ Any comments
Mr. Rauch?

Sorry for the error.  Thanks, Mario
Rich, ag6k

--
--Rich-- ag6k, 805-386-3734


From [e-mail] Tue Dec 03 19:58:20 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-stk-200.sprintlink.net!mhv.net!usenet
From: bobb <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: RF Pwr MOSFETS
Date: Fri, 29 Nov 1996 20:06:39 -0500
Organization: MHVNet, the Mid Hudson Valley's Internet connection
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: 205.161.119.119
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.02 (Win95; I)

Wanted a low cost source of RF Power MOSFETS. N-Chan, Drain to Source
voltage of 100v, and power rating of 40W. These will be used for Amateur
Radio experimenting.Some of the commerical houses have them, like "RF
Parts", but the price is too high.The Radio Shack IRF510, and IRF511 are
only good up to 10MHZ. I would like a device that would operate at
30MHZ. Bob Bartel  W2AWS


From [e-mail] Tue Dec 03 19:58:21 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!agate!cocoa.brown.edu!news
From: [e-mail] (John 015)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Inexpensive but reliable frequency counter
Date: Fri, 29 Nov 1996 20:07:36 EST
Organization: Brown University - Providence, Rhode Island  USA
Lines: 22
Message-ID: <57o1dv$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: brownvm.brown.edu
X-News-Software: BNN via BNN_POST v1.0 beta

In article <[e-mail]>, [e-mail] (Gar
y
Coffman) said:

>IMHO, a counter is a lot less useful than it may at first appear.
>Counters only give reliable readings when fed pure sinewaves.
>They will often lock to a harmonic or subharmonic of a typical
>complex signal. *AND YOU WON'T KNOW THAT.* I'd much rather have
>a scope, even a relatively cheap import scope, than to have a
>counter. Of course having both is better.

Having just added a Monsanto 1500A to my collection
(I'm looking for the schematic so I can learn how
it works) I've seen the count vary with trigger level
and be way off on complex waveforms with not that
much energy in the harmonics.

I don;'t understand why it's so easily fooled.
Care to elaborate a little of why clean sinusoidals
are required ?

Thanks,
John


From [e-mail] Tue Dec 03 19:58:22 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Electronic mags from 1974-1975
Date: 30 Nov 1996 01:22:21 GMT
Organization: AOL http://www.aol.com
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

Please e-mail with more information, thanks, David.


From [e-mail] Tue Dec 03 19:58:23 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!altitude!usenet
From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amplifier Plan Books
Date: Fri, 29 Nov 1996 20:39:18 -0500
Organization: ORION Microsystems
Lines: 25
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dynamicppp-59.hip.cam.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)

[e-mail] wrote:
>
> I would like to learn more about building RF transistor amplifiers. I
> cannot find any good literature around here. Can anyone recommend an
> information source for transistor amplifier building? I am particularly
> interested in building an amplifier using the 2SC2879. Any feedback would
> be appreciated.

One of the best book for Ham radio I know is

Solid State design for the Radio Amateur
by Wes Hayward W7ZOI and Doug DeMaw W1FB

It covers a lot of basics Transmitter design,
Power amps, VFOs, Mixers, Linears, CW, SSB...
Theory and "practice". Very good to learn,
not good if you want a step by step guide
to build a kit.

There is also Radio Frequency Design by Wes Hayward
which is also vy good (from what I hear) and more recent.

-------------------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows


From [e-mail] Tue Dec 03 19:58:24 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!fpmbh.com!iag.net!newspump.sol.net!ddsw1!news.mcs.net!hammer.uoregon.edu!arclight.uoregon.edu!phase2.worldnet.att.net!dciteleport.com!newsfeed.internetmci.com!southwind.net!usenet
From: [e-mail] (Mike Foley)
Newsgroups: rec.radio.amateur.homebrew
Subject: 3-500Z amp schematic needed
Date: 30 Nov 1996 01:59:45 GMT
Organization: Your Organization
Lines: 5
Message-ID: <57o4eh$[e-mail]>
NNTP-Posting-Host: ppp39.hit.net
X-Newsreader: WinVN 0.91.6

        I am in need of a diagram of an amp using a single 3-500Z, GG, no tuned
input.  I built one several years ago and have since lost the ARRL Handbook (1
960's
vintage, red soft cover).  I'm having some problems and need it for the specs
for the
output circuit.  Any schematic meeting these criteria would be helpful.  Thank
s,
Mike, NV0Y.


From [e-mail] Tue Dec 03 19:58:24 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!netcom.net.uk!news
From: [e-mail] (Andrew Burge)
Newsgroups: rec.radio.amateur.homebrew
Subject: OM322 module - possible a V/UHF amp ? any details please.
Date: Sat, 30 Nov 1996 02:07:16 GMT
Organization: Dungeon Network Systems
Lines: 15
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: news.flexnet.net
X-Newsreader: Forte Free Agent 1.0.82

I have in my possesion a number of 5 terminal modules labelled 'OM322'
- there is also some sort of date/revison number 'B649'.

I guess they were made by Mullard/Phillips or similar, two terminals
on one side, and 3 on the other. The devices are a small encapsulation
bonded to a mounting tab.

If anyone could point the way to some data (if they are of any use for
TXers etc.) I would be most pleased.

Thanks,

Andrew
G6ALB



From [e-mail] Tue Dec 03 19:58:25 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!gryphon.phoenix.net!insync!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!altitude!usenet
From: Madjid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Loop antenna theory?
Date: Fri, 29 Nov 1996 21:15:06 -0500
Organization: ORION Microsystems
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dynamicppp-59.hip.cam.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)

Robert Nase Johnson wrote:
>
> Hello -- I'm designing a VLF loop antenna and have read that the
> sensitvity of such an antenna is affected both by number of turns and
> area of the loop. My question is, if you can't have both, which is the
> most important?

For a receiving loop, the voltage
induced by an E field is:

   V  = 2.Pi.A.n.E.Cos(Angle)/lambda

  A Area
  n Number of turns
  E field in V/m
  Angle  angle between plane of loop and signal

If tuned (capacitor) multiply the above by Q
loaded Q of tuned circuit formed by antenna
and capacitor.

Depends of what you want to use it for, space
avalaible etc... as you can see from the formula
you can play on Area or Number but the more turns
the more difficult to tune at low frequencies and
find a suitable capacitor.

-------------------
Madjid, VE2GMI - Home Page: http://www.CAM.ORG/~mboukri
NEC4WIN Antenna simulation for Windows


From [e-mail] Tue Dec 03 19:58:26 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!torn!news.unb.ca!coranto.ucs.mun.ca!news.compusult.nf.ca!usenet
From: Martin Bowers <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: power supply
Date: 30 Nov 1996 02:39:42 GMT
Organization: Compusult Limited, St. John's, NF, Canada
Lines: 7
Message-ID: <57o6pe$[e-mail]>
NNTP-Posting-Host: ts02-p06.remote.nfld.com

need some help

i came accross some 12,28,48 lambda supplies. i know i can bring
these down to 12 with 3 terminal regulators. but i want mega current
the 12's are 3 amp can i gang these together to up the amps. what
alternitive do i have bringing the 48 to 12v 20amp. any help would
be appreciated.  tks


From [e-mail] Tue Dec 03 19:58:27 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!super.zippo.com!zdc-e!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!newspump.sol.net!ddsw1!news.mcs.net!news.abs.net!u1!wa8mcq
From: [e-mail] (Mike Czuhajewski)
Newsgroups: rec.radio.amateur.homebrew
Subject: Free Boonton 250 (broken)
Date: 30 Nov 1996 02:40:18 GMT
Organization: ABSnet Internet Services - [e-mail] - (410)-361-8160
Lines: 17
Message-ID: <57o6qi$[e-mail]>
NNTP-Posting-Host: u1.abs.net
X-Newsreader: TIN [version 1.2 PL2 [Pentium]]

I picked up a Boonton 250 RX meter at a bargain price, "as-is" at a
hamfest a few months ago.  It was a good learning experience for $10,
since it is fatally broken--one of the main tuning capacitors, the one
attached to the terminals on top, had the ceramic frame cracked by a heavy
object falling on it somewhere in the past.  It is entirely beyond repair.

If anone wants the unit, they can have it free.  The only catch is that
you have to pick it up--these things weigh a ton!  I don't know if it
works otherwise--I was too lazy to check it out--but it at least appears
to be physically complete and thus a good source of parts.  There was no
other apparent damage beyond the cracked capacitor body.

I'm located about halfway between the Washington DC and Baltimore
beltways.

--
[e-mail]


From [e-mail] Tue Dec 03 19:58:28 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.sgi.com!news-out.microserve.net!news-in.microserve.net!news.pa.net!news
From: [e-mail] (Bill Kilbourne)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Peter Dahl
Date: Sat, 30 Nov 1996 03:16:38 GMT
Organization: pa dot net(tm), A service of Cumberland Technologies Int'l
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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X-Newsreader: Forte Agent .99f/16.299

On Tue, 26 Nov 1996 11:32:24 GMT, [e-mail] (Sam Fant Jr.)
wrote:

>Dan Bryden <[e-mail]> wrote:
>
>>I've seen Peter Dahl's name listed several times in reference to
>>supplying transformers for power amplifiers. Does anyone know where I
>>can contact him for more info.  Dan
>
> PETER W. DAHL CO. AMATEUR RADIO TRANSFORMER LISTING AS OF 02/19/96.
>TELE: [phone] 5869 WAYCROSS AVENUE EL PASO, TX 79924 FAX: (915)
>751-0768. MODEL.
I've delt with these people on a few occasions and I must say that
they were real pro's and very patitent-Good People!


From [e-mail] Tue Dec 03 19:58:29 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: F.S. - Lots of tubes and related items
Date: 30 Nov 1996 03:19:34 GMT
Organization: AOL http://www.aol.com
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

FOR SALE:  Tubes, test equipment, radios including Hallicrafters,
Hammarlund, and Philco. Other older tube type radios and radio related
publications.  Schematics for many radios just $1.  Tube Manuals, Tube
Substitution books, Service Manuals, QST magazines, much more from the
30's, 40's, 50's, 60's.  Now over 1500 different tube types in stock -
E-mail [e-mail] and ask for my latest RADIO list  - #1123-T.


From [e-mail] Tue Dec 03 19:58:30 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!news-peer.gsl.net!news.gsl.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Marijan Miletic)
Newsgroups: rec.radio.amateur.homebrew
Subject: Suppressor calculations
Date: 30 Nov 96 03:25:10 GMT
Organization: ucsd usenet gateway
Lines: 44
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Rich, AG6K asked me to show the right mathematical formulas for calculating
VHF suppressor values and I did my homework!  To the best of my knowledge,
this was not done before in the ham literature.  I understand N7WS showed
proper current distribution in parallel R/L circuit ahead of my KISS example.

#1.
Decide the frequency of potential VHF oscillations from known history of the
particular tube or measurement data in real QRO circuit.  Avoid the multiples
of the highest operating frequency (in case of 30MHz NEVER tune suppressor at
90, 120 or 150 MHz).  Let us take F=130 MHz.

#2.
Calculate the inductance value needed to resonate tube output capacitance in
series with minimal variable tuning capacitor value at highest operating
frequency.  Let us suppose Cout=20pF and Cmin=20pF which gives C=10pF.

L=25330/C x F**2 (uH, pF, MHz) = 25330/10*(130*130) = 0.15 uH.

#3.
Calculate the reactance of L at the highest operating frequency.
Let us assume f=29 MHz and X=2*Pi*f*L = 27.3 Ohms.

#4.
Take a dumping resistor with a value at least three times higher than X.
Let us take 100 Ohms, but what is a power rating?

#5.
Assume we use two tubes for a legal 1.5kW RF output with HV >= 3kV.
Total RF current is Irf=P/U/sqrt2=1500/3000/1.41=0.7A.
This should be equally split to I = 350mA per tube.
We know that voltage R*Ir equals X*Ix and currents Ir**2+Ix**2=I**2.
Therefore Ir=I/sqrt(1+(R/X)**2)=350/sqrt(1+3.66**2)=350/3.79=92mA.
P=R*Ir**2=100x(0.092x0.092)=0.8 W

We should play it safe and take 2W resistor and IF it overheats, we are
either tuned to harmonic frequency or have a serious VHF oscillations!

73 de Mario, S56A, N1YU.

P.S.  Do NOT use high resistance wire for L as one is wasting ONLY RF energy
without any effect on VHF!  Dumping resistor does that job smoothly.

W8JITom, how is your cold?



From [e-mail] Tue Dec 03 19:58:30 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!phase2.worldnet.att.net!uunet!in1.uu.net!207.155.38.10!news.qnet.com!usenet
From: "Will, KN6DV" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: good source for amplifier tips
Date: 30 Nov 1996 04:14:44 GMT
Organization: KN6DV
Lines: 14
Message-ID: <01bbde75$03094660$[e-mail]>
NNTP-Posting-Host: lanc00-05.ca.qnet.com
X-Newsreader: Microsoft Internet News 4.70.1155

For those who are interested in the ongoing discussion of "good source for
amplifier tips" I have uploaded part 7.
I also added some interesting links(amplifier related) and you also will
find the letter from EIMAC ( to AG6K ) here:
http://www.av.qnet.com/~kn6dv
Thanks 73 Will,  KN6DV

REFORM
Unless the reformer can invent something which substisutes attractive
virtues for atractive vices, he will fail.
(Walter Lippmann)

[e-mail]



From [e-mail] Tue Dec 03 19:58:32 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.erols.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: NASA, Shuttles, and Amplifiers
Date: 30 Nov 96 04:14:50 GMT
Organization: ucsd usenet gateway
Lines: 47
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Gary's posting on Shuttle problems was excellent.

A couple of points, though.  The later quotes that he seemed to attribute
to me were actually Tom's.   Also, the discussions where the Thiokol
engineers were "browbeaten" were, perhaps, not quite so one-sided as Gary
implies.  The engineers did not do as good a job making the case against
a launch as they might have.  One example:  in presenting evidence meant
to show a correlation between low temperatures and o-ring erosion, they
presented only those cases in which there was erosion.  However, the
temperatures in those cases varied from about 53 degrees to 75 degrees.
There was one incident of erosion in each of those seven missions, except
for those missions launched at both the lowest and at the highest
temperatures! (There were 3 and 2 incidents, respectively, in those
cases.)

Had the engineers presented a chart including all missions, those with
and those without o-ring erosion, the correlation between temperature and
o-ring damage would have been much clearer.  None of the flights NOT
showing o-ring damage was launched below 65 degrees.  However, of flights
showing the erosion (i. e., the only ones used as evidence by the
engineers in the pre-launch meetings), four were launched below that
temperature and three above.  The correlation they presented between
temperature and erosion was hardly as convincing as it could have been,
then.

Feynman thinks that various pressures led NASA managers to bend standards
as they got away with anomalies.  However, I don't think they realized
the actual technical risks they were taking.  No doubt Mr. Mulloy made it
too hard for engineers to block the launch.  However, one might wonder if
part of his frustration was not due to the lack of a really convincing
case against launch by the engineers in question.

By the way, in the "He Fixes Radios By Thinking" chapter I mentioned
before, Feynman is a young kid who gets a reputation for being able to
fix stuff.  It's during the depression, as I recall, so a guy who has a
terrible oscillation in the audio comes and picks Feynman up and drives
him to his house. Feynman turns the radio on and hears the ungodly
noises.  So, he starts pacing back and forth until the owner says to him
something like this:  "What are you doing anyway?  I thought  I brought
you here to fix the radio."  Feynman responds: "I'm thinking!"  Then he
goes to the radio, switches two tubes and the oscillation is gone!  The
guy is suitably impressed and tells everybody "he fixes radios by
thinking!"  Feynman's explanation is in "Surely Your Joking, Mr.
Feynman!" (which was the Princeton Dean's wife's response when he later
asked for both lemon and cream in his tea.)

                                                         Dave


From [e-mail] Tue Dec 03 19:58:33 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!news.bbnplanet.com!su-news-hub1.bbnplanet.com!news.pbi.net!news1.rcsntx.swbell.net!usenet
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OM322 module - possible a V/UHF amp ? any details please.
Date: Sat, 30 Nov 1996 04:17:07 GMT
Organization: Southwestern Bell Internet Services
Lines: 23
Message-ID: <57o5rh$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ppp-151-164-37-44.rcsntx.swbell.net
X-Newsreader: Forte Free Agent v0.55

[e-mail] (Andrew Burge) wrote:

>I have in my possesion a number of 5 terminal modules labelled 'OM322'
>- there is also some sort of date/revison number 'B649'.

>I guess they were made by Mullard/Phillips or similar, two terminals
Philips/Amperex.


>If anyone could point the way to some data (if they are of any use for
>TXers etc.) I would be most pleased.
Some of these were suitable as CATV amps....

OM322: Bandwidth: 40-860Mhz, 24V supply.  Supply Current 60mA, 2
Stage, 15dB Gain, 7.0dB Noise Figure, 3tone output level for -60dB IM
= 103dBuV
Looks like it was inteded for CATV service by the inclusion of the
-60dB IM spec.
I only  have the short form data on this device.
Try Philips databook, IC-16 , wideband amplifier modules.

73, KA5TOY



From [e-mail] Tue Dec 03 19:58:33 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!cs.utexas.edu!uwm.edu!news.he.net!calweb!usenet
From: Bob Miller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Touch lamp noise
Date: Fri, 29 Nov 1996 20:52:23 -0800
Organization: CalWeb Internet Services, Inc.
Lines: 20
Message-ID: <[e-mail]>
References: <57mro4$[e-mail]>
Reply-To: [e-mail]
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Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
NNTP-Posting-User: account=bmiller
X-Mailer: Mozilla 3.0 (Win95; I)

David Robbins wrote:
>
> My XYL bought a pair of touch lamps last week, and they generate an S8
> noise level, even when they are turned off.  They turn off and on when
> I transmit.
>
> Has anyone had any luck eliminating these problems.
>
> Thanks for any help.
>
> David, KA4IKH
HI Dave,
        Had same experience.  Best to dig large hole and bury with quick lime.
Tell XYL that house was robbed and then buy her nice conventional lamps.
No hope with those nasty things without massive filters.  But then hope
springs eternal.

        Good luck.

        Bob, KE6F


From [e-mail] Tue Dec 03 19:58:34 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!metro.atlanta.com!news.he.net!uwm.edu!newsfeed.internetmci.com!news.sover.net!news
From: Les Blades <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NorCal Cascade - Where to Buy?
Date: Fri, 29 Nov 1996 20:52:56 -0800
Organization: SoVerNet, Inc.
Lines: 6
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Mime-Version: 1.0
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Can anyone tell me where one can buy the NorCal Cascade
QRP kit - and for how much?  I can't seem to find a listing
anywhere.

Tnx,
Les


From [e-mail] Tue Dec 03 19:58:36 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!news-peer.gsl.net!news.gsl.net!newspump.sol.net!ddsw1!news.mcs.net!news.abs.net!u1!wa8mcq
From: [e-mail] (Mike Czuhajewski)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re schematic drawing program
Date: 30 Nov 1996 05:00:55 GMT
Organization: ABSnet Internet Services - [e-mail] - (410)-361-8160
Lines: 48
Message-ID: <57of27$[e-mail]>
NNTP-Posting-Host: u1.abs.net
X-Newsreader: TIN [version 1.2 PL2 [Pentium]]

Someone recently endorsed the KeyCAD Complete program.  I've been using it
for a couple of years to draw the schematics in my column in the QRP
Quarterly and it's a good-enough program, especially at the price.
However, the electronic symbols library that came with it was, at least
back then, quite horrible and minimal and virtually useless.  I don't know
if they have an improved library now or not, but the one in 1994 was
nothing to write home about.

I made up my own library, which is quite easy to do once you get the hang
of it, and it's better drawn and much more complete.  For instance, as I
recall, the original library had ONE transistor, a PNP, I think.  My
library has PNP, NPN, JFET, two types of enhancement FETs.  It has a
number of symbols that were simply not provided in the original.

If anyone wants to take a look at my KeyCAD electronics symbols library,
do an anonymous to ftp.lehigh.edu, pub, listserv, qrp-l (that's a lower
case letter L at the end, not number 1), and then I think it's under
tools, where it should be fairly obvious which file it is.  Ignore the
very sort Keycad.txt file; it really should be erased and is meaningless.
The drawing file is around 60K.  Load it into KeyCAD, ignore the drawing
that will appear on the screen, and open up and browse thru the library.
Most, though not all, of my additions, are prefaced with MY, such as
MYCAP, MYPOT, MYFET, etc.

Important note:  all of my comments, and all of my files, apply ONLY to
the DOS version of KeyCAD.  They do NOT apply to Windows versions; I know
for a fact that the two are completely incompatible with each other, since
I tried swapping files with some folks who had the Windows version, and it
simply does NOT work--totally different structures.  (Neat programming
concept, huh?)

I paid around $20 for the DOS version 2 1/2 years ago; the Windows was
around $30.  I don't know if either is still marketed, but there is a CD
ROM floating around which contains the DOS version, at about $13, minus
manual.  You have to send them money if you want it; it did come with the
old DOS version I bought, and all I can say for it is that, yes, it IS a
manual :-)  It IS more informative than the on-screen help, but still
rather minimal and fairly unhelpful.  I don't know if it's been improved
since then.

In all, KeyCAD is a good, inexpensive program (though there are probably
others out there in the same price ranges which are better).  BTW, KeyCAD
has been sighted over the years in places like Office Depot, Best Buy,
Wal-Mart, Egghead, etc--widely available.  [Usual disclaimers--no interest
in the company, etc.]

--
73 DE WA8MCQ          [e-mail]


From [e-mail] Tue Dec 03 19:58:37 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!dciteleport.com!feed1.news.erols.com!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!su-news-hub1.bbnplanet.com!news.pbi.net!news1.rcsntx.swbell.net!usenet
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Electronic Kits, PLL&DDS
Date: Sat, 30 Nov 1996 07:49:59 GMT
Organization: Southwestern Bell Internet Services
Lines: 20
Message-ID: <57oian$[e-mail]>
NNTP-Posting-Host: ppp-151-164-38-17.rcsntx.swbell.net
X-Newsreader: Forte Free Agent v0.55

Greetings, electronics fans....

If you are interested in building some "kits" from artwork, schematics
and etc., then take a look at the (two) "kits" I have placed for
download on a web page.

At this time, the kits are:

A  Direct Digital Synthesizer, which operates up to 20Mhz, and is
controlled by LPT1 on your PC.

A   Phase Locked Loop circuit, using the MC145106
and MC1648 PLL IC's. It can operate to 225 Mhz.

A shareware program for printing HPG files to a laser printer.

The web page is:  www.cyberramp.net/~bspeed/

.....Bryan



From [e-mail] Tue Dec 03 19:58:38 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Jens Goerke)
Subject: Re: Front Panel Graphics
X-Newsreader: TIN [version 1.2 PL2]
Organization: Private Multi-Site
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Sat, 30 Nov 1996 08:17:34 GMT
Lines: 24

Rocci ([e-mail]) wrote:
> Here's a really easy way to produce exceptionally professional looking
> front panel graphics for your next homebrew project.
> Use your favorite computer presentation or paint program to design the
> front panel on your computer (I like Microsoft's Powerpoint, but there
> are many others that do a fine job). Use fonts, shading, and color to
> get just the right look. Use your inkjet color printer to print the
[...]

There are other methods. If you want a front panel with scratch-proof
lettering in black and transparent, print to a PostScript file and
take that to a local print shop. They will put in on imagesetter
film (up to 2400 or even 3600 dpi). You can then spray-glue this
film on the front panel.

These films are also extremely useful when producing PCBs.

Just my $.02,
73, Jens, DB9LL
--
at work: [e-mail], [e-mail] (http://barbara.combtx.com/~jg)
at home: [e-mail]
at play: jg@beach, griffin@rpg, db9ll@g-qrp/darc
Here in Germany, commercial use of personal data without permission


From [e-mail] Tue Dec 03 19:58:39 1996
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From: [e-mail] (Herbie)
Newsgroups: sci.chem.organomet,sci.engr.chem,sci.chem,comp.os.ms-windows.networking.misc,comp.infosystems.gopher,131,rec.sport.football.australian,alt.asian-movies,rec.skiing.snowboard,rec.music.makers.guitar.acoustic,rec.radio.shortwave,aus.invest,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc,[e-mail],rec.autos.vw,[e-mail],alt.2600,k12.lang.deutsch-eng,k12.lang.francais,aus.ads.forsale,aus.ads.forsale.computers
Subject: Re: BAN/INTERNET
Date: Sat, 30 Nov 1996 16:31:28 +0800
Organization: DIALix Services, Perth, Australia.
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]>
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In article <[e-mail]>, [e-mail] wrote:

>-
>--
>
>ILLEGAL INTERNET CENSORSHIP/BAN: AN AUSTRALIAN FIRST (SEE BELOW).
>SMUGGLING BOOK BACK ON MARKET - CALL FOR ROYAL COMMISSION.
>
Yawn!
>
>3
>MEDIA RELEASE

"The only thing worse than bad publicity is no publicity"- Oscar Wilde
"His Majesty is a stream of bat's piss"- Oscar Wilde meets Monty Python
"What I meant is that His Majesty is a golden shaft of light when darkness
is all around."- Oscar Wilde meets Monty Python recovering from his faux
pas.

Herbie

--
"They put a hotwire to my head 'cause of the things I did and said and made th
ese feelings go away, model citizen in every way." - J Lydon


From [e-mail] Tue Dec 03 19:58:40 1996
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From: [e-mail] (Steve Childress)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member (another twist...)
Date: Sat, 30 Nov 96 08:44:12 GMT
Organization: Self
Lines: 31
Message-ID: <57os2q$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]> <[e-mail]> <01bbde38$321b37c0$[e-mail]>
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In article <01bbde38$321b37c0$[e-mail]>, "A Redshirt" <occ
[e-mail]> wrote:
>
>Lifted from the local paper without permission, and forwarded
>without comment...
>
>"The parents of 4-year-old Sarah Engstrand filed a US $1.2
>million
>lawsuit in New York City against the girls' grandparents because
>the elder couple's Akita dog, Becky Bear, bit and deeply scarred
>
>Sarah's nose and cheek during the girl's birthday party in 1994.
>The grandparents are heartsick at being sued by their own son,
>who not surprisingly is a lawyer, as is his wife."

I wonder if the family isn't in cahoots on this - Grandparents file
bankruptcy, Homeowner's insurance pays,  Everyone profits.
Get a few crapola TV show appearances & a book.
Grandparents now live high on the hog in retirement.
Children inherit estate.

So they say, well, let's at least get something positive out of
the bad situation, eh?

Probably how a lawyer's mind works.

[e-mail]

------------------------------------------------------------
[e-mail]          If Computers Are The Answer...
  WB6CSZ                         What Was The Question?



From [e-mail] Tue Dec 03 19:58:41 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member (another twist...)
Date: 30 Nov 1996 09:05:32 GMT
Lines: 38
Message-ID: <57otcs$tm0$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <[e-mail]> <56clho$8cp$[e-mail]> <57a3vj$[e-mail]> <57ac8a$[e-mail]> <[e-mail]> <01bbde38$321b37c0$[e-mail]>
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In <01bbde38$321b37c0$[e-mail]>, "A Redshirt" <occupant@ps
yber.com> writes:
>
>Lifted from the local paper without permission, and forwarded
>without comment...
>
>"The parents of 4-year-old Sarah Engstrand filed a US $1.2
>million
>lawsuit in New York City against the girls' grandparents because
>the elder couple's Akita dog, Becky Bear, bit and deeply scarred
>
>Sarah's nose and cheek during the girl's birthday party in 1994.
>The grandparents are heartsick at being sued by their own son,
>who not surprisingly is a lawyer, as is his wife."
>
If I had to guess, based on no other information, I would guess that this is
a scheme to get around the inheritance tax, which will tax a bequest from
the grandparents to the kids or grandkids, at a confiscatory rate of 45% if th
ey
have a sizeable estate.

On the other hand, tort damages for physical injury are generally excluded fro
m
taxes.  Therefore, the unfortunate injury to the daughter may be a vehicle for
all concerned to avoid the inheritance tax.  (Or it may not be; I'm only
guessing).

Sounds like a clever scheme, by a clever lawyer.  The kind of lawyer people
pay good money for.

Roger J. Buffington
W6VZV
[e-mail]

USC Law School, Class of '97

--------------------------------------------------
"I want to die peacefully, in my sleep, like my Grandfather."
"Not screaming, and in terror, like his passengers."
--------------------------------------------------



From [e-mail] Tue Dec 03 19:58:42 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.idt.net!newsfeed.internetmci.com!in3.uu.net!192.89.123.24!nntp.inet.fi!news.funet.fi!news.utu.fi!newsmaster
From: [e-mail] (─yrΣs Pertti)
Newsgroups: rec.radio.amateur.homebrew
Subject: MAR-1,2,3,4,4,6, where to obtain?
Date: 30 Nov 1996 09:28:25 GMT
Organization: University of Turku, Finland
Lines: 14
Distribution: all
Message-ID: <57ounp$[e-mail]>
NNTP-Posting-Host: sara.cc.utu.fi
X-News-Reader: VMS NEWS 1.24


Hello there


I have plans to build a rf amplifier using those MAR-X (dont recall
the number) devices. But I cannot find them in Finland. Does
anybody know where I could purchase them? Please e-mail me if you
have information.

73

Pertti




From [e-mail] Tue Dec 03 19:58:43 1996
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From: [e-mail] (Brian Carling)
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: EASY: YOU CAN build a tube transmitter!!
Date: Sat, 30 Nov 1996 10:16:50 GMT
Organization: Monumental Network Systems
Lines: 24
Distribution: inet
Message-ID: <57pbtb$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news1.epix.net rec.radio.amateur.boatanchors:793 rec.radio.amateur.homebrew:21562 rec.radio.amateur.misc:119175

I have sent a couple more articles for posting at the web site.
6AQ5A_1.GIF and  SCROUNGR.GIF
The latter is an article sent to me by WB6TNL describing his homebrew
6L6 TX that he has been having fun with.
Some of you fellers might enjoy building these "oldies but goodies!"

They are simple one tube "junkbox transmitters" that you can put
together from scratch in one day once you have collected the parts.

The articles can be found at:

http://www.barepower.net/~carreiro/

or take the LINK there from -

http://www.mnsinc.com/bry/hamfiles.htm

Enjoy! 73 de AF4K, Bry

73 from Amateur Radio AF4K  /  G3XLQ
http://www.mnsinc.com/bry
E-mail:  [e-mail]
Home of MEGALIST ham radio files, pirate links etc. etc.



From [e-mail] Tue Dec 03 19:58:44 1996
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From: Gary Tait <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: power supply
Date: Sat, 30 Nov 1996 10:50:38 -0500
Organization: Bruce Municipal Telephone System
Lines: 19
Message-ID: <[e-mail]>
References: <57o6pe$[e-mail]>
NNTP-Posting-Host: ns.primeline.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: Martin Bowers <[e-mail]>
In-Reply-To: <57o6pe$[e-mail]>

On 30 Nov 1996, Martin Bowers wrote:

#need some help
#
#i came accross some 12,28,48 lambda supplies. i know i can bring
#these down to 12 with 3 terminal regulators. but i want mega current
#the 12's are 3 amp can i gang these together to up the amps. what
#alternitive do i have bringing the 48 to 12v 20amp. any help would
#be appreciated.  tks
#

I'd use a 723, going through a bank of well heatsinked pass transistors.

At that current level, I might even use a switch mode regulator
(convert that voltage to current instead of heat).

Gary Tait , VE3VBF
- Please do not quote US prices, they are no good to me ,here in Canada -



From [e-mail] Tue Dec 03 19:58:45 1996
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From: [e-mail] (Leon Heller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MAR-1,2,3,4,4,6, where to obtain?
Date: Sat, 30 Nov 96 17:49:57 GMT
Organization: Home
Lines: 20
Distribution: all
Message-ID: <[e-mail]>
References: <57ounp$[e-mail]>
Reply-To: [e-mail]
X-Mail2News-User: [e-mail]
X-Mail2News-Path: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <57ounp$[e-mail]>
           [e-mail] "─yrΣs Pertti" writes:

> I have plans to build a rf amplifier using those MAR-X (dont recall
> the number) devices. But I cannot find them in Finland. Does
> anybody know where I could purchase them? Please e-mail me if you
> have information.

The Mini-Circuits distributor for Finland is:

        Integrated Electronics OY AB,
        SF-00701 Helsinki.
        Tel: [phone]

73, Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.



From [e-mail] Tue Dec 03 19:58:46 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: TIPS: C.W. 2.4 GHz 10 KWh Dummy Load
Date: 30 Nov 1996 17:57:34 GMT
Organization: AOL, http://www.aol.co.uk
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

Dear Forum Members:

I am looking for some quick ideas to build a C.W. 10 KWh, 2.4 GHz
MW dummy load, perhaps you have some suggestions.

Any quick fix or hint would be much appreciated. I was considering
building an oil cooled dummy load, using a tradiitonal UHF design as
used in most amateur radio shacks, but I would like to hear your
comments first, before I take the house down.


Thank you for your help.


Alberto.


From [e-mail] Tue Dec 03 19:58:47 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transformer For Power Supply
Date: 30 Nov 1996 18:14:43 GMT
Organization: America Online, Inc. (1-800-827-6364) (1.13)
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]
X-Newsreader: AOL Offline Reader

>  Keep all floating from
>chassis except the return of the first one.
>
>

You end up with a very large system this way.
But it worked fine for me also. I
had 3  5 volt 45 amps supplies going.

Best of all it cost me nothing.

Carl


From [e-mail] Tue Dec 03 19:58:48 1996
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From: David Sipe <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.boatanchors,rec.ham-radio.swap
Subject: FS: Sunair HF PA
Date: Sat, 30 Nov 1996 10:39:24 -0800
Organization: CalWeb Internet Services, Inc.
Lines: 57
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Xref: news1.epix.net rec.radio.swap:97366 rec.radio.amateur.homebrew:21568 rec.radio.amateur.equipment:43333 rec.radio.amateur.boatanchors:797

For Sale:

Sunair GSL-1900A Kilowatt Linear Power Amplifier. Consists of the
LPA-1900A RF
PA and the PS-1900A power supply unit. This set easlily delivers full
rated
power on all bands. Asking price: $2000.00. I prefer pickup from my QTH
in
Sacramento, CA. If I have to ship it, you pay shipping from zip 95826.
The rf
deck will be about 90 lbs packed for shipping and the power supply will
be
about 150 lbs packed for shipping. (since UPS has a max weight of 150
lbs,
I may have to remove the choke from the power supply and ship
separately)

For those not already familiar with this unit, some specs from the
manual are
listed below.

    Covers 1.6 to 30Mhz (continuous) in 8 bands.
    Conservatively rated at 1Kw PEP for SSB,
        1 Kw for CW, and 1Kw average for AM.
        (the book says 300 to 400 for AM carrier only, then
        limit the total power with modulation to 1Kw).
    Requires 40 watts PEP input to drive to full output.
    Automatic tuning (plate and load). Tuning time 3 seconds, nominal.
    Uses 4CX1500B, Pi-L output network, and 50 ohm passive input
        (no tuning needed for input).
    Very low distortion.
        Intermodulation distortion: better than -30 db
        Harmonic distortion: better than -55db
    Power supply strappable for 120 or 240v operation 50-60 hz.
        and power consumption is approx 3Kw. (240v operation is
        highly recommended and is current strapped for it).

A copy of the Operation and Maintenance Manual will be included. The
interconnect cables between the rf deck and power supply were not
available at a reasonable cost (Sunair wanted $1200 for just the cable
with connectors) so I made an easily restorable modification. The units
are in good condition cosmetically and fully operational.
Also, I have contructed an interface unit that works with my Yaesu
FT-747 for
operating the amplifier. It provides the remote power control, band
selection,
and tune functions that would normally be provided a Sunair exciter.
This is
included with the purchase of the amplifier. The interface unit can be
easily
adapted to work with almost any tranceiver.

Please respond via E-mail to the below address.

--
73  David   KD6QFZ
[e-mail]


From [e-mail] Tue Dec 03 19:58:49 1996
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From: David Sipe <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.ham-radio.swap
Subject: FS: 4CX1500B and socket
Date: Sat, 30 Nov 1996 10:49:10 -0800
Organization: CalWeb Internet Services, Inc.
Lines: 21
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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For Sale:

4CX1500B/8660 and air system socket, $300 plus shipping
from zip 95826.

I have three of these sets.

They are pulls and have been tested in an operational
Sunair 1 Kw amplifier. Full power out, 160m thru 10m
into dummy load.

The sockets do not have any markings on them, but
after comparing them to the Eimac catalog, they appear
to be SK-800B sockets with 1500pf screen bypass capacitor.

Please respond via E-mail at the below address.

Thanks.
--
73  David   KD6QFZ
[e-mail]


From [e-mail] Tue Dec 03 19:58:50 1996
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From: David Sipe <[e-mail]>
Newsgroups: rec.ham-radio.swap,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.boatanchors
Subject: FS: Sunair HF PA
Date: Sat, 30 Nov 1996 10:55:18 -0800
Organization: CalWeb Internet Services, Inc.
Lines: 48
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sac1-2.calweb.com
Mime-Version: 1.0
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Xref: news1.epix.net rec.radio.amateur.homebrew:21570 rec.radio.amateur.equipment:43337 rec.radio.amateur.boatanchors:799

For Sale:

Sunair GSL-1900A Kilowatt Linear Power Amplifier Consists
of the LPA-1900A RF PA and the PS-1900A power supply unit.
This set easlily delivers full rated power on all bands.
Asking price: $2000.00. I prefer pickup from my QTH in
Sacramento, CA. If I have to ship it, you pay shipping
from zip 95826. The rf deck will be about 90 lbs packed
for shipping and the power supply will be about 150 lbs
packed for shipping. (since UPS has a max weight of 150 lbs,
I may have to remove the choke from the power supply and ship
separately)

For those not already familiar with this unit, some specs from
the manual are listed below.

    Covers 1.6 to 30Mhz (continuous) in 8 bands.
    Conservatively rated at 1Kw PEP for SSB,
        1 Kw for CW, and 1Kw average for AM.
        (the book says 300 to 400 for AM carrier only, then
        limit the total power with modulation to 1Kw).
    Requires 40 watts PEP input to drive to full output.
    Automatic tuning (plate and load). Tuning time 3 seconds, nominal.
    Uses 4CX1500B, Pi-L output network, and 50 ohm passive input
        (no tuning needed for input).
    Very low distortion.
        Intermodulation distortion: better than -30 db
        Harmonic distortion: better than -55db
    Power supply strappable for 120 or 240v operation 50-60 hz.
        and power consumption is approx 3Kw. (240v operation is
        highly recommended and is current strapped for it).

A copy of the Operation and Maintenance Manual will be included.
The interconnect cables between the rf deck and power supply were
not available at a reasonable cost (Sunair wanted $1200 for just
the cable with connectors) so I made an easily restorable modification.
The units are in good condition cosmetically and fully operational.
Also, I have contructed an interface unit that works with my Yaesu
FT-747 for operating the amplifier. It provides the remote power
control, band selection, and tune functions that would normally be
provided a Sunair exciter. This is included with the purchase of
the amplifier.

Please respond via E-mail to the below address.

--
73  David   KD6QFZ
[e-mail]


From [e-mail] Tue Dec 03 19:58:50 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!cs.utexas.edu!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!193.118.80.10!nntp.onyx.net!usenet
From: [e-mail] (Paul Mooney)
Newsgroups: rec.radio.amateur.homebrew
Subject: Transistor equivelents
Date: Sat, 30 Nov 1996 19:01:55 GMT
Organization: ONYX Internet
Lines: 10
Message-ID: <57q0hm$[e-mail]>
NNTP-Posting-Host: r03-50.octacon.co.uk
X-Newsreader: Forte Free Agent 1.0.82

Hi everyone,

I'm looking for a source of transistor equivelents on the Net.
I've tried all the search machines I know but got no joy.

Is there anyone out there who could point me in the right direction,
please?

73s de Paul G7SPV



From [e-mail] Tue Dec 03 19:58:51 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!199.0.65.182!news-in.tiac.net!posterchild![e-mail]
From: "Dave" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: GUILTY
Date: 30 Nov 1996 19:41:33 GMT
Organization: The Internet Access Company, Inc.
Lines: 15
Message-ID: <01bbdef6$7d9bbc60$25ed77ce@ka1wgn>
NNTP-Posting-Host: p4.gw1.athol.ma.tiac.com
X-Newsreader: Microsoft Internet News 4.70.1155

Sorry !!

        I posted a pic of an amplifier for a reply
        I know now that it's a no no.

Dave,n1iqo

[e-mail]

oh,
        The pic was of a 3-400Z from ARRL handbook
        1967 Red cover.
        If you need it
        E-mail me and i will send it to you via E-mail



From [e-mail] Tue Dec 03 19:58:52 1996
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From: Bigdad <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ICOM IC-230 Accessory plug
Date: 30 Nov 1996 19:59:00 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
Lines: 5
Message-ID: <57q3m4$[e-mail]>
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Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Not sure if this made it thru last time so please bear withe
me...Im in need of the pinout of the accessory plug on the Icom
IC-230 2m radio, sure hope someone can help me here...thanks!!




From [e-mail] Tue Dec 03 19:58:53 1996
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From: [e-mail] (Jim Potter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TIPS: C.W. 2.4 GHz 10 KWh Dummy Load
Date: Sat, 30 Nov 1996 20:55:00 GMT
Organization: The Santa Fe Institute
Lines: 58
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dial141.roadrunner.com
Mime-Version: 1.0
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X-Newsreader: Forte Agent .99f/32.299

[e-mail] wrote:

>Dear Forum Members:
>
>I am looking for some quick ideas to build a C.W. 10 KWh, 2.4 GHz
>MW dummy load, perhaps you have some suggestions.
>
>Any quick fix or hint would be much appreciated. I was considering
>building an oil cooled dummy load, using a tradiitonal UHF design as
>used in most amateur radio shacks, but I would like to hear your
>comments first, before I take the house down.
>
>
>Thank you for your help.
>
>
>Alberto.
I have made a dummy load for 425 MHz using a technique that you may be
able to apply at 2.4 GHz.  Basically you make a tapered water load.
Take a section of waveguide several guide wavelengths long (or make a
rectangular pipe the same size as whatever waveguide you are using
-WR-340?) and mount it at a shallow angle, wide side horizontal. Fill
it with odinary tap water to a level that fills the guide at the low
end and doesn't overflow at the high end. If you are feeding the load
with waveguide, you will need a bend to mate with the load section.
You will also need some sort of moisture barrier the keep water vapor
from condensing in the remainder of the waveguide.  And, in order to
remove 10 kW of power from the load you will need to circulate the
water to a heat exchanger or run tap water and flow it into the drain.
It wll take only a few gpm to keep the temperature rise reasonable. If
you make the load too short you may not have a good VSWR. Also, the
heating will be concentrated in the shallow end and you may not be
able to remove it fast enough to prevent boiling.

Oh,yes. Put a vent pipe on the top side to prevent pressure build up.
A 5 or 6" long piece of 1/4" ID pipe ought to do the job.

On the one I built, I was driving with coax at 425 MHz and coupled to
the load with a stub antenna - just the center conductor extending
into the wave guide a ways. I varied the length of the stub and its
distance from the near end wall to get the best VSWR at the operating
frequency.

Yuo can also use this load as a calorimeter to measure the power if
you know the flow rate and the temperature rise, assuming you have
enclosed the load in styrofoam or something to prevent excessive heat
loss to the air.

I also once made a load from a met garbage can filled with water, but
it was not so broadband and was a bit harder to tune.

Jim Potter

James M. Potter, President              TEL: [phone]
JP Accelerator Works, Inc.              FAX: [phone]
2245 47th Street                        EMAIL: [e-mail]
Los Alamos, NM 87544-1604               URL: http://www.jpaw.com



From [e-mail] Tue Dec 03 19:58:54 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Inexpensive but reliable frequency counter
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]> <57o1dv$[e-mail]>
Date: Sat, 30 Nov 1996 20:57:16 GMT
Lines: 40

In article <57o1dv$[e-mail]> [e-mail] (John 015)
writes:
>In article <[e-mail]>, [e-mail] (Ga
ry
>Coffman) said:
>
>>IMHO, a counter is a lot less useful than it may at first appear.
>>Counters only give reliable readings when fed pure sinewaves.
>>They will often lock to a harmonic or subharmonic of a typical
>>complex signal. *AND YOU WON'T KNOW THAT.* I'd much rather have
>>a scope, even a relatively cheap import scope, than to have a
>>counter. Of course having both is better.
>
>Having just added a Monsanto 1500A to my collection
>(I'm looking for the schematic so I can learn how
>it works) I've seen the count vary with trigger level
>and be way off on complex waveforms with not that
>much energy in the harmonics.
>
>I don;'t understand why it's so easily fooled.
>Care to elaborate a little of why clean sinusoidals
>are required ?

Sure, a clean sinewave is a single frequency, *any* other waveform
can be shown by Fourier analysis to be a combination of sinewaves at
a number of frequencies (which may be harmonic or non-harmonic). For
example, a squarewave is made up of a sinewave at the fundamental
frequency *and* all of the odd harmonics of that frequency. An AM
modulated signal is made up of carrier, fundamental modulation
frequencies, and their products, the sidebands, none of which are
harmonically related.

With any waveform other than a sinewave, the counter can lock to
any of the sinewave components making up the signal, depending on
a number of variables which aren't always under your control.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Dec 03 19:58:56 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!math.ohio-state.edu!news.physics.uiowa.edu!nntp.ksu.edu!news.mid.net!news.uark.edu!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: Sat, 30 Nov 1996 22:26:00 GMT
Organization: The University of Arkansas
Lines: 26
Message-ID: <[e-mail]>
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There are only 3 laywer jokes...

all the rest are true stories!

On Tue, 26 Nov 1996 00:09:28 GMT, [e-mail] (CDN) wrote:

>[e-mail] (Anthony S. Pelliccio) wrote:
>
>
>>For some absolutely hysterical lawyer jokes surf on over to
>>http://cartalk.com and look for the picture of a shark with a tie on. Click
>>on it and be launched into a sampling of NOLO Press' favorite lawyer jokes.
>>
>>Tony
>
>
>Why is it that when you tell a 'joke' about an Irishman it is called
>tasteless; when you tell a joke about a black it is called racist, and
>when you tell a joke about a lawyer it is called funny?
>
>hmmmm
>
>cdn
>
>



From [e-mail] Tue Dec 03 19:58:57 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news-peer.gsl.net!news.gsl.net!ix.netcom.com!news
From: [e-mail](Stanley D Gruver)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.homebrew,
Subject: Satellite Receiver ******FOR SALE******
Date: 30 Nov 1996 22:36:49 GMT
Organization: Netcom
Lines: 13
Message-ID: <57qcu1$[e-mail]>
NNTP-Posting-Host: tul-ok6-53.ix.netcom.com
X-NETCOM-Date: Sat Nov 30  4:36:49 PM CST 1996
Xref: news1.epix.net rec.radio.amateur.misc:119223 rec.radio.amateur.antenna:32220 rec.radio.amateur.homebrew:21578


    Used

    Toshiba TRX 80 with VC2+      $275
    Panasonic 4500 with VC2+      $275
    VC2+ decoder                  $150

   A complete system with receiver, VC2+, new 25 degree LNB, new
feedhorn, new 24" actuator, new 7.5' mesh dish for ONLY $625 plus
shipping.

   E-mail reply please
                           Thanks,  Maura


From [e-mail] Tue Dec 03 19:58:58 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in1.uu.net!132.175.109.6!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: "David B. Holtkamp (K5KH)" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TL922 Arcing/Oscillating? Help with diagnosis?
Date: 30 Nov 1996 22:48:48 GMT
Organization: The Santa Fe Institute
Lines: 25
Message-ID: <01bbdf0e$7b3dbb40$[e-mail]>
References: <01bbdd57$e8537f20$[e-mail]> <[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
X-Newsreader: Microsoft Internet News 4.70.1155

Rich,

  Sorry to be so late in replying, but I had a massive disk
crash/corruption and I'm still trying to recover.

  Thank you for your thoughts and suggestions on this matter and I will
happily try one of the parasitic reduction kits you are providing.

  As we discussed, I will be sure to post the results of the installation
of this kit and be sure to let all who are interested know about the
progress!

  Again, thank you very, very much for your help! And experience!

  Best regards,

  David (K5KH)

R. L. Measures  <[e-mail]> wrote in article
<[e-mail]>...
> In article <01bbdd57$e8537f20$[e-mail]>, "David
B.
> Holtkamp" <[e-mail]> wrote:
>



From [e-mail] Tue Dec 03 19:58:59 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!portc02.blue.aol.com!audrey01.news.aol.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TIPS: C.W. 2.4 GHz 10 KWh Dummy Load
Date: 30 Nov 1996 23:47:14 GMT
Organization: AOL, http://www.aol.co.uk
Lines: 6
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ladder01.news.aol.com
X-Admin: [e-mail]

Jim:

Thanks that was a very interesting suggestion, I will give it
further reflection once I get off line.

Alberto


From [e-mail] Tue Dec 03 19:59:00 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!uunet!in2.uu.net!207.155.38.10!news.qnet.com!usenet
From: Noel KF6CAD <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Drake MN 2700
Date: Sat, 30 Nov 1996 16:06:56 -0800
Organization: Quantum Networking Solutions; USA; [e-mail]
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: simi00-27.ca.qnet.com
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Content-Transfer-Encoding: 7bit
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Looking for a copy of the user manual for the Drake Antenna Tuner and
Schmatics. ALso any info on year it was built would be thankfull.
The model number is MN 2700 Matching Network.
73's de Noel
[e-mail]


From [e-mail] Tue Dec 03 19:59:01 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!206.63.63.70!nwnews.wa.com!news
From: [e-mail]
Newsgroups: rec.radio.shortwave,rec.radio.amateur.space,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.dx,rec.radio.amateur.digital.misc,alt.radio.digital,alt.ham-radio.vhf-uhf,alt.ham-radio.uwave,alt.ham-radio.ssb,alt.ham-radio.spread,alt.ham-radio.slowscan,alt.ham-radio.rtty,alt.ham-radio.packet,alt.ham-radio.nocode,alt.ham-radio.morse,alt.ham-radio.hf,alt.ham-radio.fm,alt.ham-radio.fax,alt.ham-radio.exotic-modes,alt.ham-radio.eme,alt.ham-radio.dxing,alt.ham-radio.digital-voice,alt.ham-radio.binaries,alt.ham-radio.amtor,alt.ham-radio.am
Subject: Re: Sound Blaster 16 Spectral display & Filtering FREEWARE
Date: Sat, 30 Nov 96 17:42:00 PDT
Organization: Northwest Nexus Inc.
Lines: 34
Message-ID: <[e-mail]>
References: <56bbbe$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <575asp$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>  <[e-mail]>
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> Clifford Buttschardt wrote:
> >
> > I've had the very same difficulty for weeks!  Cliff K7RR
> >
> > On Wed, 27 Nov 1996, Jay wrote:

                     snip

>
> I just got it using Netware 3.01 with no problems whatever. Try again!
>
> -- N6AXB in Cave Junction, Orygon.
> --------------------------------------------------------------------
> Lee, of the Independent Republic of Jefferson: ([e-mail])
>   We laugh at honor and are shocked to find traitors in our midst.
>                                           -C. S. Lewis
> --------------------------------------------------------------------


Hey Guys,

Why is this thread propigated to 29 different news groups?  That is a horrible

waste of spectrum.


Please Please dump all of the news groups from your replies except one.
alt.ham-radio.digital-voice seems like the right place to me.

Please let this message be the last one to all 29 news groups.

Bill



From [e-mail] Tue Dec 03 19:59:02 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!news.comm.net!ts01-port07.nod.comm.net!horizons
From: [e-mail] (Karen E.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Effects of hurricanes on communications
Date: Sun, 1 Dec 1996 01:37:00 UNDEFINED
Organization: CommNet Inc.
Lines: 44
Message-ID: <[e-mail]>
NNTP-Posting-Host: ts01-port07.nod.comm.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1]

Greetings all;

I am currently writing an article for a ARES Internet News Letter on the
effects of tidal surge, high winds, tornados and over usage of these systems
in the event of a catagory 4 or 5 hurricane striking the US.  As I live in New

Orleans, I have not experanced a major hurricane sense Camile in 69 and
Betsy in 63.  Neither of these storms had a direct impact on the city. Even if

they had, the types of communications that both civilians and goverment where
only a dream or thought in someones mind.

I am looking for any information from those that have been in HAM radio or
involved with local or state goverment communications in an area hit by a
major storm in the last 10 years or so.  I could really use thyeir input in
order to make sure what I write is as close to the truth as possible.  What I
need to know is:

1.      How badly where the systems jammed before the storm hit?

2.      What was communications like during the storm?

3.      How many different types of systems where down after thye storm
        pasted. ie; Commerical, Goverment and Amateur?

4.      How long did it that to get these systems back operational?

5.      What form of communications where use after the storm, and before normal
        communications where restored?

6.      What lessons where learned by both those that use VHF, UHF, 800 & 900
        trucking and Celluar?

The answers I reveive could help other areas prepare for the possibility of
such a storm.  As for New Orleans, we really need a wake up call as many of
those living here have never been in a severe hurricane ands think fror
whatever reason God will protect our city. So, if any of you could help
enlighten me as to what occured in your area, I would be most grateful.

Please send all answers to: [e-mail]

73's DE Karen E. Johansen - KC5FCU
EC East Jefferson Parish, LA.
Amateur Radio Emergency Service
http:www.accesscom.net/~gmccraw



From [e-mail] Tue Dec 03 19:59:03 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsfeed.internetmci.com!southwind.net!usenet
From: [e-mail] (Zack Clobes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602AN Circuits
Date: 1 Dec 1996 02:36:34 GMT
Organization: SouthWind Internet Access, Inc.
Lines: 13
Message-ID: <57qqvi$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hut10.southwind.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

In article <[e-mail]>, [e-mail] says...
>
>Does anyone have any circuit diagrams for the
>NE602AN?  Could you please tell me a source for
>good circuits using this device?  Thank you.  Rod, W5HVV

The 1995 ARRL Handbook has about a page of info on the chip.  It included
sample schems, circuit impedances, matching networks etc..

73s de Zack, W0ZC
[e-mail]
http://www2.southwind.net/~zclobes/zackc.html



From [e-mail] Tue Dec 03 19:59:04 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!EU.net!uunet!in1.uu.net!155.212.1.8!paperboy.ids.net!anomaly.ideamation.com!anomaly.ideamation.com!not-for-mail
From: [e-mail] (Anthony S. Pelliccio)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ARRL lawyer to sue member
Date: 30 Nov 1996 21:36:50 -0500
Organization: Ideamation, Inc.
Lines: 22
Message-ID: <57qr02$[e-mail]>
References: <01bb739f.8e9f00c0$[e-mail]> <57ac8a$[e-mail]> <[e-mail]> <[e-mail]>
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In article <[e-mail]>,  <[e-mail]> wrote:
>There are only 3 laywer jokes...
>
>all the rest are true stories!

I can pretty much believe that. After reading those it makes me wish
I had a daughter so I could forbid her to marry a lawyer. :)

>>Why is it that when you tell a 'joke' about an Irishman it is called
>>tasteless; when you tell a joke about a black it is called racist, and
>>when you tell a joke about a lawyer it is called funny?

Even though you didn't post this, I missed the original response so here
goes:

The reason it's funny is because by and large most lawyers are lower
than slime.

Tony





From [e-mail] Tue Dec 03 19:59:05 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Lawrence Stoskopf)
Newsgroups: rec.radio.amateur.homebrew
Subject: Good source for amplifier tips
Date: 1 Dec 96 02:46:29 GMT
Organization: ucsd usenet gateway
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Just discussed this supressor bit with an experienced Collins TX
engineer.  Found it amusing.  They had a 10 KW HF rig that had an inch
wide by three inch aluminum strap from the tube to the tuning capacitor.
Mounted on the strap were two noninductive resistors side by side
(parallel) mounted along the strap.  Everyone looking at the amp
wondered why they shorted the resistors.

Apparently you build the amplifier, then figure out  where the
parasitics are and do what it takes to get rid of them.  Seems a bit
empiric for todays models, but doubtlessly effective.  This is the limit
of my information on this.

N0UU


From [e-mail] Tue Dec 03 19:59:06 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!southwind.net!usenet
From: [e-mail] (Zack Clobes)
Newsgroups: rec.radio.amateur.homebrew
Subject: PLL's
Date: 1 Dec 1996 02:50:19 GMT
Organization: SouthWind Internet Access, Inc.
Lines: 11
Message-ID: <57qrpb$[e-mail]>
NNTP-Posting-Host: hut10.southwind.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

I was reading an article in the latest copy of QST covering the
theory/construction of a temp compensated VFO.  The schematic reminded me of a

PLL with a feedback loop tied to a crystal oscilator.  In his article, he made

the statment that his VFO wouldn't have the extra phase noise that a
traditional PLL has because of the loop.  Can anyone explain this?  I didn't
think that the VCO wouldn't be effected by the locking loop.
Thanks
73s de Zack, W0ZC
[e-mail]
http://www2.southwind.net/~zclobes/zackc.html



From [e-mail] Tue Dec 03 19:59:08 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!phase2.worldnet.att.net!uunet!in1.uu.net!199.242.23.5!nwlink.com!usenet
From: Bryan Nelson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Home brew back up power.
Date: Sat, 30 Nov 1996 19:02:41 -0800
Organization: The Emergency Preparedness Information Center (TheEpicenter.com)
Lines: 30
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip020.mu1.nwlink.com
Mime-Version: 1.0
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X-Mailer: Mozilla 3.0Gold (Win95; I)

This weeks Emergency Preparedness "Tip OÆda Week" is on building your
own generator (AC and DC) using a gas edger motor, car alternator, and a
power inverter (if AC is required).

Home Brew power (on the cheap)! A T.O.W. visitor submission, with
additions by the crew at TheEpicenter.com.

http://TheEpicenter.com/tipoweek.html

---------------------------
While there, check out the past episodes on generators called
"Everything you ever (or never) wanted to know about emergency power,
lights and generators!"

Part one can be found at http://TheEpicenter.com/tow01076.html
Part two is located at http://TheEpicenter.com/ tow1230.html
---------------------------


Bryan




--
Bryan Nelson, TheEpicenter.com
The Emergency Preparedness Information Center (Epicenter)
6523 California Ave. SW #161    Seattle, WA 98136
Web site....  http://TheEpicenter.com
Email.......  [e-mail]


From [e-mail] Tue Dec 03 19:59:09 1996
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From: [e-mail] (Scott Marchini)
Newsgroups: rec.radio.amateur.homebrew
Subject: Hammarlund HQ-100c info needed
Date: Sun, 01 Dec 1996 04:03:16 GMT
Organization: I-2000 Inc., Internet Services
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: selden22.access1.dh.i-2000.net
X-Newsreader: Forte Agent .99e/32.227

Looking for schmatic, parts sources and anything else I might need to
restore a Hammarlund HQ-100C rcvr.  Any help would be greatly
appreciated.

Thanks
Scott KE2MX


From [e-mail] Tue Dec 03 19:59:10 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-hub.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!feed1.news.erols.com!news.alt.net!newspost1.alt.net!usenet
From: [e-mail] (Fred Vobbe)
Newsgroups: rec.radio.amateur.homebrew
Subject: PL Detector
Date: Sun, 01 Dec 1996 04:30:49 GMT
Organization: Altopia Corp. - Affordable Usenet Access - http://www.alt.net
Lines: 26
Message-ID: <57qtfc$[e-mail]>
Reply-To: [Default: [e-mail]]
X-Newsreader: Forte Free Agent v0.55


Hello gang,

I tried to post this on my other server, and it apparently did not make
it out for some reason, so let me start again.

I'm looking for a PL dectector unit, (prefer commercial assembly) for
installation in a repeater system.  I have tried the Hamtronics, which I
was disappointed in the quality, and the Selectone ST-139 which I had
some problems with, so I would like to see what else is available.

Needs are... must fit into a 2" x 2" x 1.2" space, and powered by
+12vdc.  1). Needs to pick up quickly, and needs to drop when the tone
goes away.   2). Must give either a +5 volt logic level to the
controller or have a common collector output which I can use with a
12vdc reed relay to provide the signal back to the controller.  (Reed
relay takes about 34 mills at 12 volts).  3). The PL at the discrim
point is 2/10ths of a volt p/p

I would prefer something built as I don't have the time right now to
experiment with this and that, and especially trouble-shoot.  I need to
get the repeaters on the air.

If anyone knows any manufacturers that build a kit that will sence 100
hz PL, please E-mail me at  [e-mail]  or  [e-mail]