World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_10/_homebre.txt

Text File | 1997-02-01 | 932KB | 21,747 lines

The World of Ham Radio CD-ROM



From [e-mail] Mon Oct 07 20:27:41 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Bill Turner)
Subject: Re: Ideas for MILLI-OHMETER?
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[e-mail] (Gary Coffman) wrote:

>In article <51vdsc$[e-mail]> [e-mail] (William
 Kresl) writes:
>>HI! I have an application to track down a +5volt rail SHORT on
>>some computer equipment. I have a FLUKE model 77 DVM. Any ideas
>>on a good circuit to built up to to use as an add-on for this?
>>I'd like to hear your suggestions, rather then plunge head-first
>>into a pile of old ham mags.
>
>Let me offer an alternative way to track down this sort of pesky
>problem. Use a current probe. HP sells one that looks like a
>logic probe, but it is really a current probe sensing the current
>in the trace you are following.
>
>To use it to find a short in the +5 buss, just apply power through
>a current limiting resistor, chosen to limit current to 5 mA, to
>the 5 volt buss, and follow the buss along until the probe stops
>showing a current flow. You've just passed the short. It's a really
>easy, and really fast way to find these pesky shorts, especially on
>multi-layer boards.
>
>Note, the rest of the circuitry won't be drawing current because
>the short is hammering the buss, and limiting current to 5 mA will
>prevent damage. Works like a charm.
>
>Gary
---------------------------------------------
Gary's suggestion would work fine, but if you want to do it on the cheap, try
this:  Connect a 5 volt power supply through a 5-20 ohm resistor to the
shorted area.  This will allow a limited current to flow through the short.
Using the DMM on the lowest millivolt range, measure the voltage drop along
the bus wire.  For a current of one amp, expect about a 25 millivolt drop per
inch of wire.  The exact drop depends on the wire size, of course.  As you
proceed along the bus, the millivolts will continue to increase until all of a
sudden, they don't.  You have found your short.  I've used this technique to
find shorts inside multi-layer PCBs and it works great.  Now, FIXING these
shorts is something else....  :-)


73, Bill W7LZP
[e-mail]


From [e-mail] Mon Oct 07 20:27:42 1996
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From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wtd:  75MHZ XTAL filter
Date: Tue, 01 Oct 1996 05:19:22 GMT
Organization: RST Engineering
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[e-mail] (Wes Stewart) shared these priceless pearls of wisdom:

->Thanks to Bill for this info.  I live down the road in Tucson, but as far
as I
->know, there is no Beer Valley Road (and I'm an expert on the subject) in
->Phoenix.  Try Deer Valley Rd.

If you don't think there is a Beer Valley Road in either Phoenix or Tucson,
then you never went to either U of A or ASU.  I only played them in sports
from SDSU, but I guarandamntee you there is a Beer Valley something or
other after most games.  {;-)

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 Oct 07 20:27:43 1996
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From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC-DC Converter IC needed
Date: 30 Sep 1996 23:02:20 -0700
Organization: BEST Internet Communications
Lines: 19
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References: <[e-mail]>
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In article <[e-mail]>,
John Ackermann <[e-mail]> wrote:
>Howdy --
>
>I need to generate 15-18 volts DC at 50 milliamps from an input that
>fluctuates from 11.5 to about 13.0 VDC.  Can anyone suggest a DC-DC
>converter chip that would work for this application?
>
>Thanks!
>
>John Ackermann   AG9V
>[e-mail]

I would try looking at the switching regulators made by Maxim
and National Semiconductor.  The selector guides and data sheets
are available through their web pages.

Steve M. WF6R



From [e-mail] Mon Oct 07 20:27:44 1996
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From: Lars Arvidsson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrew Capacitance/inductance Meter/Bridge?
Date: Mon, 30 Sep 1996 23:26:45 -0700
Organization: Lassie Inc.
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Stephen John Farthing wrote:
>
> I would like to make a device for measuring the vales of inductors and
> capacitors. Essentially I like making radios and need to be able to
> measure (and match) components to within 1% or so. Can someone point me
> at a suitable homebrew design?
> --

Hello Stephen!
I guess that one of the most simpliest ways is, to build a basic
stable oscillator with low-straycapacitance plug-in possibilities
for the L and C. Then you can use a freq-counter, or a CW reciever
and calculate your values. To be able to make a fair compare
between two coils or caps the R-loss has to be the same in the
two units to be compared, but that's probably no problem, since
you wish to sort out components of the same type.

The other possibility is to make a wheatstone's bridge, but it's a
little tricky to measure low L:s and C:s. Look in the ARRL:s handbook
for details.

good luck /Lars  (SM4RZW)


From [e-mail] Mon Oct 07 20:27:45 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news4.epix.net!uunet!in3.uu.net!EU.net!sun4nl!baan.nl!news
From: Feico de Boer <[e-mail]>
Subject: Re: Any freeware UHF+ PCB layout stuff around?
Sender: [e-mail]
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Date: Tue, 1 Oct 1996 07:37:53 GMT
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Stephen Muther wrote:

> In article <1996Sep29.143120.647@main03>, Joe Landis <[e-mail]> wrote
:
> >Are there any inexpensive (or freeware) PC based PCB artwork CAD packages
> >suited for UHF/microwave microstrip layout? I don't need schematic capture
or
> >routing capability - just something to help visualize layout and placement,
> >with maybe some DRCing and automation in dimensioning lines WRT frequency,
PCB
> >material, and desired impedance. (Too much to ask?) :)
> >
>
> Unfortunatly, I think this is way too much to ask for freeware and
> "inexpensive" CAD software.  Also, DRC implies netlist traceablility
> which requires some kind of schematic capture capability.
>
> The best freeware I know of is Protel's Easytraks which you can
> get from their web site. http://www.protel.com.  I notice they
> are reorganizing their web stuff so you may have to wait a bit
> before you can download from there.  Easytracks is fine for digital
> stuff, but has very little flexibility for RF in the way of
> irregular polygons etc.
>
> If you are doing this for homebrew boards, you probably don't
> need gerber photoplot capability.  I have heard of people doing
> boards on some of the more inexpensive software like Correl Draw
> or Illustrator.  Even Paintbrush can be used.
>
> >I dont want to go head first into this and blow $$$ on a package that I may
> >rarely use.
>
> I company I work for just paid several thousand dollars for
> for a Windows based Schematic and PCB design system which includes
> some of the features you asked for.  I think thats about the
> going rate right now...unfortunatly.
>
> Steve Muther WF6R

Maybe the shareware stuff from Ivex may help. Recently I downloaded the
100 pin shareware versions for evaluation. Although I enables me to hang
up my computer easely, it appears to work reasonably if you try to avoid
the bugs. The shareware version does not include a autorouter but makes
PCB design a lot easier than creating the layout with paintbrush.

The Ivex homepage is at www.ivex.com and the unlimited pin licence
appears to be +/- $500.

Greetings,

--
Feico de Boer, Technical Consultant, Baan/HP Cooperative Technology
Center
Email: [e-mail], Phone: [phone], Fax: [phone]
Baan Europe B.V., P.O. Box 143, 3770 AC  BARNEVELD, The Netherlands
Baan Company on the web @ http://www.baan.com/


From [e-mail] Mon Oct 07 20:27:46 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news4.epix.net!uunet!in3.uu.net!EU.net!sun4nl!baan.nl!news
From: Feico de Boer <[e-mail]>
Subject: Re: Any freeware UHF+ PCB layout stuff around?
Sender: [e-mail]
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Feico de Boer wrote:

> Maybe the shareware stuff from Ivex may help. Recently I downloaded the
> 100 pin shareware versions for evaluation. Although I enables me to hang
> up my computer easely, it appears to work reasonably if you try to avoid
> the bugs. The shareware version does not include a autorouter but makes
> PCB design a lot easier than creating the layout with paintbrush.
>
> The Ivex homepage is at www.ivex.com and the unlimited pin licence
> appears to be +/- $500.

Hmm, something pops up from the dark edges of my mind. I believe
UltiBoard sell a 'lite' PCB design package limited to 500 pins for $295.
Check out Ultiboard on www.ultiboard.com.

More greetings,

--
Feico de Boer, Technical Consultant, Baan/HP Cooperative Technology
Center
Email: [e-mail], Phone: [phone], Fax: [phone]
Baan Europe B.V., P.O. Box 143, 3770 AC  BARNEVELD, The Netherlands
Baan Company on the web @ http://www.baan.com/


From [e-mail] Mon Oct 07 20:27:46 1996
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From: "Ordenador Cuatro" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: JAMBOREE
Date: 1 Oct 1996 07:53:27 GMT
Organization: Aula Informßtica
Lines: 4
Message-ID: <01bbaf6c$8d5c8440$160000be@uno>
NNTP-Posting-Host: infovia181.cin.es
X-Newsreader: Microsoft Internet News 4.70.1155

we are a group of hams from spain. we will be active in the International
scouts jamboree 19/20 october, our special call will bE ED2LSJ hope to see
you there



From [e-mail] Mon Oct 07 20:27:47 1996
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From: adriaan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF-UHF-SHF beacons
Date: Tue, 01 Oct 1996 00:54:48 -0700
Organization: Planet Internet
Lines: 38
Message-ID: <[e-mail]>
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This is a multi-part message in MIME format.

--------------49589FF7F7B
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

-------------------------------------------------------------
PE1KHP                                       Radiozendamateur

Homepage                http://home.pi.net/~adpe1khp/home.htm
Packet Radio                                    PE1KHP@PI8APD
-------------------------------------------------------------
QRV with VHF dx-ing SSB on 2 meter Tropo, MS, Sp-e and Aurora
-------------------------------------------------------------
There a lot of hamfun to do on 70cm, don't give it to the CB
-------------------------------------------------------------

--------------49589FF7F7B
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="!BAKEN.TXT"

Hi dx friends,

My name is Adriaan, my age is 32 years old. I live in
Apeldoorn. That is a city with 150.000 inhabitant. In the
Netherlands live 14 million people. Apeldoorn is a green place in
the hart of the Veluwe, what is in the centre-east of the
Netherlands.

See my beacon page on www.
http://home.pi.net/~adpe1khp/baken.html
Its a list of VHF UHF and SHF beacons in Europe.

Greetings from the Netherlands, Adriaan PE1KHP.

--------------49589FF7F7B--



From [e-mail] Mon Oct 07 20:27:48 1996
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From: [e-mail] (Lars Moell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Any freeware UHF+ PCB layout stuff around?
Date: Tue, 01 Oct 1996 14:55:08 GMT
Organization: National Defence Research Establishment, Sweden
Lines: 55
Message-ID: <52rb9l$[e-mail]>
References: <1996Sep29.143120.647@main03> <52oqhg$[e-mail]>
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Yes microwave CAD packages are too expensive! My company uses as an
low cost solution Superstar (to compliment  the much bigger HP/EESOF
which we also uses)  which cost "only" 1500-6000 US dollars.

I would as a very low-cost solution use the Visio drawing package.
They have someting called smartshapes and stenciles. One can have a
"toolbox" with corners and traces plus some foot-prints of
transistors. The layout is produced by drag-and-drop techniques. Once
you have the standard shapes defined you should be able to design a
circuit in no-time. It would even be great to trade foot-prints and
shapes amongst us here!!!

Using ordinary (i.e. digital) CAD programs are a real pain in the butt
for producing analogue circuits.
73 de Lasse SM5GLC

[e-mail] (Stephen Muther) wrote:

>In article <1996Sep29.143120.647@main03>, Joe Landis <[e-mail]> wrote:
>>Are there any inexpensive (or freeware) PC based PCB artwork CAD packages
>>suited for UHF/microwave microstrip layout? I don't need schematic capture o
r
>>routing capability - just something to help visualize layout and placement,
>>with maybe some DRCing and automation in dimensioning lines WRT frequency, P
CB
>>material, and desired impedance. (Too much to ask?) :)
>>

>Unfortunatly, I think this is way too much to ask for freeware and
>"inexpensive" CAD software.  Also, DRC implies netlist traceablility
>which requires some kind of schematic capture capability.

>The best freeware I know of is Protel's Easytraks which you can
>get from their web site. http://www.protel.com.  I notice they
>are reorganizing their web stuff so you may have to wait a bit
>before you can download from there.  Easytracks is fine for digital
>stuff, but has very little flexibility for RF in the way of
>irregular polygons etc.

>If you are doing this for homebrew boards, you probably don't
>need gerber photoplot capability.  I have heard of people doing
>boards on some of the more inexpensive software like Correl Draw
>or Illustrator.  Even Paintbrush can be used.

>>I dont want to go head first into this and blow $$$ on a package that I may
>>rarely use.

>I company I work for just paid several thousand dollars for
>for a Windows based Schematic and PCB design system which includes
>some of the features you asked for.  I think thats about the
>going rate right now...unfortunatly.

>Steve Muther WF6R






From [e-mail] Mon Oct 07 20:27:49 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ideas for MILLI-OHMETER?
Date: Tue, 01 Oct 96 16:45:01 GMT
Organization: EZNEC Antenna Software
Lines: 11
Message-ID: <52rhoe$[e-mail]>
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In article <[e-mail]>,
   [e-mail] (Bill Turner) wrote:

>. . .
>I've used this technique to
>find shorts inside multi-layer PCBs and it works great.  Now, FIXING these
>shorts is something else....  :-)

Drill through 'em.

Roy Lewallen, W7EL


From [e-mail] Mon Oct 07 20:27:50 1996
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From: [e-mail] (Kevin Muenzler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Want "Modulated CW" technique
Date: 1 Oct 96 19:30:30 GMT
Organization: ucsd usenet gateway
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


David Johnson <[e-mail]> writes:

-I want to be able to connect my mfj-557 code practice key+oscillator
-from its earphone jack to my dual-bander FM rig to send FM cw.  The idea
-is to hold practice sessions to help interested codeless techs to
-upgrade to tech+ etc...by holding practice sessions on 2M repeaters and
-simplex frequencies...

-Do you know of an article or circuit that could help me?

Well since you sending a single tone to your microphone input
you don't have to worry too much about fidelity, or lack
thereof caused by the impedance mismatch, but you don't want
to overdrive your microphone input.  Go to Radio Shack
and buy their attenuating patch-cord.  This will work pretty
well to prevent overdriving your microphone pre-amp.  Then
you just need to adjust the volume level on your oscillator
for a good deviation level.  Works great for me!  I'm
using a Yaesu FT-290 with an adapter for the microphone plug
doing the same thing.

Kevin, WB5RUE



From [e-mail] Mon Oct 07 20:27:51 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Longwave Amateur Band
Date: 2 Oct 1996 01:39:38 GMT
Organization: DCI HiNet
Lines: 16
Message-ID: <52sh4q$[e-mail]>
NNTP-Posting-Host: ms8.hinet.net
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X-Newsreader: TIN [version 1.2 PL2]

I heard that there's a longwave amateur band somewhere around 100 kHz or
200 kHz for experimenters.

Could someone tell me the exact frequency range of the band?  Also, I
heard that it's not really an amaeur band, but actually it's open for
anyone to use, as long as a few restrictions are kept.  Could someone tell
me what the restrictions are?  Also, is only CW allowed, or is AM and
LSB/USB also permissible?

In addition, could someone tell me where I can get schematics for a
homebrew transmitter for this band?

Thanks in advance.

Mark Nagel, N3FRP



From [e-mail] Mon Oct 07 20:27:52 1996
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From: norman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FOR SALE: KAY 100 DB ATTENUATOR
Date: 2 Oct 1996 03:32:27 GMT
Organization: your orginanization
Lines: 6
Message-ID: <52snob$[e-mail]>
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I HAVE FOR SALE A FEW KAY MODEL 439A ATTENUATORS.  4 EA 20 DB STEPS ANS 1
EA 10, 5, 3, 2 AND 1 DB STEPS.  50 OHM IN/OUT, DC TO 1.5 GHz, BNC IN/OUT.
GREAT FOR ATTENUATING RECEIVED SIGNAL FOR FOX HUNTS, OR LOWERING INPUT
SIGNAL TO TRANSVERTERS.  $35 EACH
DE NORM,  N8RGR



From [e-mail] Mon Oct 07 20:27:53 1996
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From: [e-mail] (who3)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What happened to Heathkit anyways?
Date: 2 Oct 1996 03:53:43 GMT
Organization: Concentric Internet Services
Lines: 26
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References: <523thr$[e-mail]>
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>In article <[e-mail]>, [e-mail] writes:

>>Well, they basically priced themselves out of the market. Why would you
>>spend a lot of time building equipment that wasn't as good as stuff you
>>could buy off the shelf for less?
>>
>>The reason kits were made in the first place was because hams liked
>>building them, and minus the labour of assembly, they could be sold
>>cheaper than ready built items. (And hams were always...errr frugal)
>>
>>By the 1970's there was no longer any financial advantage in kits.
>>
>>

>As a former Heath contract engineer I can give a little more insight on
>this.

I hate to trouble you but i am down to my last straw.

I need the manual, or the scams, or the acutal device (working or not)
that HeathKit produced called a Component TRACER. If you have any advice
please forward.

Excuse my intrusion.
Wes



From [e-mail] Mon Oct 07 20:27:55 1996
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From: Ramon Gandia <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with Hi power HF amp (4-1000a) pi tank
Date: Tue, 01 Oct 1996 20:01:42 -0800
Organization: Anvil Technology
Lines: 57
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References: <52rfht$[e-mail]>
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Glenn Taylor wrote:
>
> I am finishing up an amp construction that was started by someone else
> a while back.  I don't  have the orginal design notes,  plans etc.
>
> My question is about the pi tank circut values
>
> All values are for 40m
>
> The plate impendance using Bill Orr W6SAI's tables  for a Q of 10
> E\2I  = aprox 4500 ohms,   tune cap of 50pf inductance of 10.5 uh and
> a load cap of 170pf.
>
> Now for my problem (?)  to get max out the load cap needs to be about
> 400+pf.  To get any power out of this deck I needed to put 3  100pf
> fixed caps in parallel with the 350pf variable cap (estimated).
>

Glenn,

I don't have the tables here with me, but for 40 meters the capacity
values, both the plate and the load capacitor, seem a bit skinny.
Most pi-networks I dealt with had 1000 pf load for 80 meters,
whcih would be 400 - 500 for 40 meters.  The values you suggest sound
to me like for 20 meters or so.  Double check your values.  It is
possible there is a missprint in the book, these things do happen.

If you have acces to a grid dip meter, turn off the set and grid
dip the final tank, make sure it resonates on 40.  You might be
doubling in the final tube from 40 meter exciter to 20 meter output.

And using fixed capacitors across the output is a time honored way
of doing it.  The designs I've seen, have a switch assembly that
switches in fixed capacity steps of less than the variable, so you
can get any value from (nearly) 0 pf to say 1000 pf.  The Johnson
Viking was one of these.

A more modern solution, brought about mainly by the Japanese tube-type
transceivers, was to put in the fixed capacitor with the band switch.
This arrangement does not have much range in the way of impedance
matching, but is fine for 50 ohms with swr up to 2 or 3.  In the
old sets, with the separate switch, you could just about load any
piece of wire, as long as the variable capacitor did not arc over.

In one of my setups, I took a wire somewhere in the 100 ft range and
ran it out my 2d story window to a tree and plugged it into the
antenna jack in back.  Could match any band, 160 thru 10 and load up.
Other lengths sometimes needed pruning, which is easy if the far end
of the wire is on a pulley and you just reel in a couple of feet and
snip it!

Watch yourself with the 4-1000 amplifier.  Lethal voltages and big,
nasty r.f. arcs and burns can result.  I set a tree on fire one
time with the end of my antenna touched the branches and my 1 kw
pair of push-pull 810's.  40 meters.

Ramon, AL7X, Nome, Alaska


From [e-mail] Mon Oct 07 20:27:56 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with Hi power HF amp (4-1000a) pi tank
Date: 2 Oct 1996 09:38:10 -0400
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In article <52rfht$[e-mail]>, [e-mail] (Glenn
Taylor) writes:

>
>The plate impendance using Bill Orr W6SAI's tables  for a Q of 10
>E\2I  = aprox 4500 ohms,   tune cap of 50pf inductance of 10.5 uh and
>a load cap of 170pf.

That looks ok. It takes a capacitive reactance of just over 45 ohms to
make
a Q of 10. Most people simplify the formula to Rp/Q = Xc, which would then
be 45 ohms.

The Q should be a minimum of  *one plus the square root of Rp/Rload* for
the network to operate reliably as a pi, so you really need a Q of 10.5 or
more. I'd be safe and use a Q of 12 or 14, you are below the normal edge
of operation.

You need about 61 pF anode C, 9 uH and 355 pF load minimum, and I'd
probably use even more capacitance and less inductance to be safe.  At
lower drive levels or lower load impedances, or with a load is slightly
inductive, you will need even more loading C, even if you get the anode Q
right. Also remember the plate tuning capacitor is shunted by the anode
capacitance and choke reactance, so it may be several pF off from the
calculated value.

>Now for my problem (?)  to get max out the load cap needs to be about
>400+pf.  To get any power out of this deck I needed to put 3  100pf
>fixed caps in parallel with the 350pf variable cap (estimated).
>
>What would cause this?  I have seen another amp that needs alot more
>load cap than the design calls for also.
>What am I missing?

The Q is too low and remember the formula you used to determine the
operating impedance is a VERY rough approximation. The true anode
impedance is NOT E/ 2 Ip for any stage, unless you are a very lucky guy.
The correct value is generally quite a bit differnt, and can only be found
by doing a Chaffe analysis of the tube.

Since you are running the tube in a mode that is not documented in any of
Eimac's, I could only do a Chaffe analysis by plotting the constant
current curves of the tube. So Can't help you there.

My best guess is the anode impedance is a bit higher than 4500 ohms, since
the approximation Orr uses is really almost a guess. All of these little
errors add up, and to me it looks like you are too far on the "light" side
of capacitance.

By the way, the gain you are seeing is typical of a 4-1000A at that anode
voltage in grounded grid. They are not very high gain tubes because the
driving impedance is pretty high in grounded grid.

73 Tom


From [e-mail] Mon Oct 07 20:27:57 1996
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From: Ryan Snyder <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Modification Question
Date: Wed, 02 Oct 1996 10:17:55 -0700
Organization: New Mexico Insitute of Mining and Technology
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Hello,
  Does anyone know how to modify an IC-2GXAT to get other frequencies
not
on the HAM Bands?

Thanks,
RS
KC5WDT




From [e-mail] Mon Oct 07 20:27:57 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with Hi power HF amp (4-1000a) pi tank
Date: Wed, 02 Oct 1996 16:10:46 -0500 (CDT)
Organization: INTERNET AMERICA
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[e-mail] (Glenn Taylor) wrote:

>Now for my problem (?)  to get max out the load cap needs to be about
>400+pf.  To get any power out of this deck I needed to put 3  100pf

Assuming you output impedance is very close to 50 Ohms, you may have
the right components there now.  I played with your tube operating
conditions (instead of doing what I should be doing) and, for the
desired output network phase shift of -135 degrees in the
4.5K-5K-to-50 Ohm range, the output C should be about 500 Pf and the L
should be 7.5-7.8 uh.  The operating Q calculated out at 14, 70 pf to
tune.  I imagine you have 20 pf in strays.  Sounds like you're right
where your wanted to be--no matter how you got there.


FRED

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



From [e-mail] Mon Oct 07 20:27:58 1996
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From: john fleenor <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Electronic Projects
Date: Wed, 02 Oct 1996 21:17:22 -0700
Organization: Why? Network   [phone]
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visit john's ham page at http://www.why.net/home/jlfleenor for free web
page graphics, ham software, ham links, electronic projects and more!


From [e-mail] Mon Oct 07 20:27:59 1996
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From: Larry Martin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RE:  Filter k & q derivation?
Date: 3 Oct 1996 04:54:18 GMT
Organization: West Coast Online's News Server - Not responsible for content
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To: [e-mail]

[e-mail] (Lawrence Stoskopf) wrote:
>Have been playing with some various XTAL filter designs.  I have Zverev's
>excellent standard, but would like to do one with more poles than in his
>tables, especially the gaussian and gaussian to -12 dB.  Anyone know how to
>calculate the k & q values?  I suspect I'm looking at the method in his book
>and don't see it, but with a Pentium Pro 200 and Mathcad, suspect I have
>more firepower than he used for his derivations! (Not the equations)
>
>FWIW, have had a good time running thru some old data from published
>articles, in HR, Liao's amplifier book, some old vertical formulas and
>seeing the problems with rounding or smoothing in graphs.
>
>Lawrence E. Stoskopf, M.D.
>N0UU
>
You can probably simply repeat the inner sections of the filter with good
results.  I have used this technique with good success for Butterworth
and other filter types.

Good luck-
Larry

[e-mail]



From [e-mail] Mon Oct 07 20:28:00 1996
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From: [e-mail] (RRRath)
Newsgroups: rec.radio.amateur.homebrew
Subject: C 50DSK: qexresp. ported anyone from C26?
Date: 3 Oct 1996 08:23:26 -0400
Organization: America Online, Inc. (1-800-827-6364)
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Hi,
As I have only the TMS320 C50 DSK has anybody ported said
pgn described in QEX??

73s Robert
DJ0RA


From [e-mail] Mon Oct 07 20:28:01 1996
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From: [e-mail] (Dr.S.J.Roberts)
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 3 Oct 96 20:09:09 GMT
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unsubscribe [e-mail]


From [e-mail] Mon Oct 07 20:28:01 1996
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From: [e-mail] (PBUNN624)
Newsgroups: rec.radio.amateur.homebrew
Subject: For Sale   MF8CCN  Switch Capacitor Filter IC's
Date: 3 Oct 1996 20:59:48 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <531ni4$[e-mail]>
Reply-To: [e-mail] (PBUNN624)
NNTP-Posting-Host: newsbf02.mail.aol.com

I have 57 MF8CCN switch capacitor filter IC's. They are currently selling
in the $4 each in 25 quantity range. They are new in sleeves. I will sell
them for $125 plus $4 postage.

Email

[e-mail]


From [e-mail] Mon Oct 07 20:28:02 1996
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From: Yvon Roy <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Adjustable attenuator
Date: Thu, 03 Oct 1996 20:34:09 -0700
Organization: Sympatico
Lines: 17
Message-ID: <[e-mail]>
References: <52almb$[e-mail]> <[e-mail]>
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To: Mike Willis <[e-mail]>

Mike Willis wrote:
>
> [e-mail] wrote:
> >
> > Looking for a circuit to build an electrically adjustable attenuator at 45
0 MHz.
> >
> > Anyone??
> >
> > Thanks!
> >
> > Micke
>
> Mini-Circuits. PAS-1 electronically adjustable attenuator.

If you want a constant impedance variable attenuator, Hewlett Packard
has an application note using PIN diodes. Regards. Yvon.
<[e-mail]>


From [e-mail] Mon Oct 07 20:28:05 1996
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From: [e-mail] (Mark Aitken)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV on 10 GHZ
Date: 4 Oct 96 08:57:43 GMT
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NNTP-Posting-Host: mail.ucsd.edu
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At 04:30 AM 28/09/96 PDT, you wrote:

>Date: Sat, 28 Sep 96 01:24:28 GMT
>From: [e-mail] (Marwynne Kuhn)
>Subject: ATV on 10 GHZ
>
>  I am looking for information on how to set up 10 GHZ ATV.  I would like to
>use Gunplexers and build a interface for the video to transmit. I would like
>to know how to get a quality picture off the the gunplexer.  I would also lik
e
>to here from someone who has done this.
>
>Thanks in advance for the help ..........WB5PWG.......... Webster, Texas
>
>God made Earth and rested
>God made Man and rested.
>God made Woman and ever since neither God or Man has rested.  :)
>
>Marwynne Kuhn WB5PWG
>[e-mail]
>


Hello,

I found that if the capacitor was removed from across the GUNN_DIODE/GND
connection
the picture was improved 10 fold!  Must have acted as a filter and reduced
the bandwidth
presented to the gunn_diode for osscillation???

I used a simple video modulated powersupply and an alarm module gunn diode
unit for the TX
side and a modified Ku band LNC and NEC1022a Sat RX for the RX side.

Full Colour/Quieting pictures where received over a very small 15m distance
with NO antenna
on either the TX or RX side,  just open wave guide.

Best of luck

73

Mark


ax25net : vk3jma@vk3ksd.#mel.vic.aus.oc
internet: [e-mail]





From [e-mail] Mon Oct 07 20:28:06 1996
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From: [e-mail] (Lars Moell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Cush-Craft A3
Date: Fri, 04 Oct 1996 10:40:43 GMT
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Hi
a few months ago I got (almost for free) a Cush Craft A3 beam, but
with no manual. Is there any kind soul that coud fax or e-mail me some
dimensional data on the antenna so I can get it up in the air soon.
The antenna is now dismantled and needs all its clamps to be renewed
(rust). Things would be so much easier knowing the dimensions of the
elements and markings of the traps.
73 Lasse SM5GLC



From [e-mail] Mon Oct 07 20:28:07 1996
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From: [e-mail] (Mark K Flanagan)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: Schematic, P.C. Board or kit for Modulated CW
Date: 4 Oct 96 15:22:17 GMT
Organization: ucsd usenet gateway
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NNTP-Posting-Host: mail.ucsd.edu
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Hello,

I'm looking for a schematic, p.c. board or kit that would allow the use
of a straight
key or paddles and keyer to generate modulated CW and key an FM rig to
transmit.
I would prefer a semi-break-in design.

73 de [e-mail]


From [e-mail] Mon Oct 07 20:28:08 1996
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From: [e-mail] (Wayne Cronin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Amateur Band
Date: Sat, 05 Oct 1996 06:25:29 GMT
Organization: AT&T WorldNet Services
Lines: 26
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[e-mail] (Richard Karlquist) wrote:

>In article <5332nf$[e-mail]>,
>Mustang Maniac <[e-mail]> wrote:
>>
>>There are no licenses required, although the FCC encourages hams to use
>>their callsigns as identifiers when on that band.
>>
>>There have been some articles in the ham magazines in recent years about
>>the 1,750 Meter band.  Check back issues of QST, 73, etc.

>I thought I read in one of those articles that you are *not*
>supposed to use ham callsigns on 1750, rather use your initials
>or something.

That's what I've heard, too. DO NOT use your ham callsign on the 1750M
band!


>Rick N6RK
>(Still trying to figure out how to get down to 160 meters)

----
Wayne Cronin
[e-mail]



From [e-mail] Mon Oct 07 20:28:09 1996
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From: [e-mail] (Ht2watch)
Newsgroups: rec.radio.amateur.homebrew
Subject: im lookin to build a 0-12v regulated power supply ,,,need schematics
Date: 5 Oct 1996 03:37:33 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <53537t$[e-mail]>
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i need to build a fairly good 0-12vdc adjustable power supply....my
brother
has a radio shack one that has dual outputs, but the schematics are not
avail
and the parts have no numbers (i wonder why they did that....lol)
any way if anyone can help i would love to hear from them


thanks

bob


From [e-mail] Mon Oct 07 20:28:09 1996
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From: [e-mail] (JohnsonHE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Filter k & q derivation?
Date: 5 Oct 1996 10:36:41 -0400
Organization: America Online, Inc. (1-800-827-6364)
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Wes Haywards L and X software calculates these values out to 40 poles or
so.

W4ZCB


From [e-mail] Mon Oct 07 20:28:10 1996
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From: [e-mail]
Newsgroups: alt.radio.scanner.uk,rec.radio.shortwave,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.swap,rec.radio.amateur.equipment
Subject: NRD 535 crystal filters wanted /to exchange
Date: Sat, 05 Oct 1996 23:39:56 GMT
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I intend to replace some of the filters in my NRD535, so if anyone has
the replacement Crystal filters for the 535 at a good price, I may be
interested. I also have a 1.8khz filter for the NRD  that I would like
to exchange for for the 300hz, 500hz or possibly the 1000hz, so if you
have these, but are mainly interested in SSB, please contact by email

Also wanted, the Bandwidth Control Board for the NRD535.
I am in the UK.

Regards,

Joe Kirlew


From [e-mail] Mon Oct 07 20:28:11 1996
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From: [e-mail]@smtp-news2.ibm.net
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Plate voltages
Date: 6 Oct 1996 03:13:04 GMT
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In <536gk8$[e-mail]>, gbostick@luna (Wish I knew) writes:
>In many of the HF amps for amateur radio there is a cw/ssb switch that
>changes the plate voltage from low on cw to high on ssb. I have read that
>this is to maintain efficiency at the different power inputs used. The
>high plate voltage makes sense, in that for a given power level a lower
>current would be required. To run at a lower voltage, thus requiring a
>higher current at a given power does not make sense. So, if you can run
>1000W input with 2500V @ 400MA, what is the reason for lowering the
>voltage to 1700V and then having to push 588MA ?  What is the criteria for
>selecting the lower voltage value?
>
>This is an equal opportunity question open to all that would like to share
>their answers, as I am a bit weak in the hi pwr linear amp design
>department.
>
>-gary
>[e-mail]


 Hi,

 It changes the operating point of the tube, like class A, AB, B, C. In CW you
 typically run class C. It's a point on the characteristic curve of the tube t
hat
 dictates how much plate current flows with a certain level of bias. (grid vol
tage)
 Go with the higher voltage, and tune the plate to keep within the legal limit
.
 Most tubes drive easier with a higher plate voltage. Go to your local library
 or
 maybe some local old timer may have the Eimac 'Care and Feeding of Power
 Grid Tubes'. It does a great job of explaining the whole deal with load lines
,
 impedances, and all. They're not too tough to understand. Only the Gate 2
 Vanity Call operation is beyond comprehension. Cheers!

                             Jim -  WD9AHF



From [e-mail] Mon Oct 07 20:28:12 1996
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From: "miker in Tigard, OR." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Car battery (13.8) to
Date: Sun, 06 Oct 1996 02:18:47 -0700
Organization: Hevanet Communications
Lines: 33
Message-ID: <[e-mail]>
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Bill Turner wrote:
>
> [e-mail] (BOB ROACH) wrote:
>
> >  >-I need to find or build a circuit that regulates a car battery
> >  >-to always be 12.0 volts. Looking to get 2-3 amps out of it.
> >
> >Hi John,
> >
> >I have done this very effectively by using a three lead low current
> >regulator to control N-P-N transistor that will handle the load you
> >have.  This circut can be as few as three components(resistor,
> >transistor, and regulator).
> ---------------------------------------------
> You can get away with only three components if you locate the regulator fair
ly
> close to the battery, say within a foot or so.  Any farther away and you
> should place a .1 mfd capacitor from the input to ground to prevent
> oscillation.  It's also a good idea to put one on the output to ground, but
> you might sneak by without that one.  Personally, I figure they're cheap, pu
t
> 'em in.
>
> 73, Bill W7LZP
> [e-mail]

In general, you CAN'T get 12.0V out of a car battery using a linear
regulator unless you plan on leaving the motor running and use a
PNP pass transistor or very low drop-out regulator.
Also, in an automotive environment, you  need to worry about protection.
Sticking an IC on the +13.6V line is likely to eventually end up a shorted dev
ice.
Use some inductance and a big cap in addition to the protection diodes
required by the regulator itself.
Thre's a lot more to this than meets the eye.
miker


From [e-mail] Mon Oct 07 20:28:13 1996
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From: John Evans <[e-mail]>
Newsgroups: alt.radio.scanner.uk,alt.radio.scanner,rec.radio.scanner,rec.radio.shortwave,sci.electronics.repair,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: CFS & CFJ Murata ceramic filters
Date: Sun, 6 Oct 1996 10:55:27 +0100
Organization: Listener Information Service Team
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In article <[e-mail]>,
[e-mail] writes
>Finally, I am looking for a design of a loop antenna similar to the
>KIWA MW loop. Unfortunately, I can't possibly afford the 350 UKP price
>of the KIWA, much as I would like to buy it, so building a similar
>design(balanced loop with DG Mosfet amplifier and bandwidth control)
>is the only alternative. Has anyone built a design by GF Maynard
>called the "WQ medium wave loop". This appeared in the UK "Shortwave
>magazine" in November 1986, and looks very impressive. However, the
>construction is VERY complex, so I would like to gather any opinions
>before starting on the project myself.
>
Joe, Graham Maynard has several ready made loop antenna design's and
builds them to customer preferences.

For info on these and other loop items, contact....

[e-mail]

This is the reprint service of the Medium Wave Circle, a UK based club
specifically catering for the Medium / Longwave listener. Magazine
reprints are available which cover a vast number of topics pertaining to
the Medium and Longwaves.

Regards,
--
John Evans. G7CEC.   "....tis better to have listened and not heard,
                          than never to have listened at all."



From [e-mail] Mon Oct 07 20:28:15 1996
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From: [e-mail] (Chris Elmquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Expanding foam (urethane?) where to get?
Date: 6 Oct 1996 14:43:47 -0500
Organization: The Basement of N0JCF
Lines: 43
Message-ID: <53925j$[e-mail]>
References: <[e-mail]> <52a3hm$[e-mail]>
NNTP-Posting-Host: n0jcf.com

In <[e-mail]>, [e-mail] (David Feldman) writes:
>I'm working on mounting several VHF radios into a ZERO/Halliburton type
>"suitcase" cabinet. I'd like to use urethane (expanding) foam to position
>the radios, instead of building some complicated metal structure (the
>radios are various ICOM IC-?02 series VHF/SSB rigs). Anyway, where do
>you buy the stuff? As I recall, it's two chemicals, and when you mix them,
>they make a foam that then hardens. You can form the stuff by pumping it
>into a heavy duty plastic bag, forming it around the equipment you want
>to package, and then let it harden. Then after it's hardened, you can cut
>it with a knife to make openings (for cables), adjustments, and such.
>
>Anyway, is this stuff  bought at hardware stores, paint stores, or where?

'round here you can find it at most any home center under the name
of Great Stuff.  It comes in a red can with a yellow snap off lid
(like a can of spray paint).  It is already mixed and begins to
expand the instant you let it out of the can.  Although, I once found it
packaged in a cardboard box with two seperate canisters inside
and a tube to dispense it from.  It mixed in the tube as
you dispensed it. I have not seen it this way in the last couple years
however.

It's really aggressive stuff...  sticks to absolutely everything.
I would be really, really certain that whatever equipment
you are going to foam in is safely sealed in some kind of bag or wrapper.
It will most certainly ruin the finish (or front panel!!) of
any piece of gear it contacts.

Another idea is to visit one of these mailing/shipping/packing
stores.  The one's around here go by the name of Packaging
Store.  They have the two part, foam-in-place stuff on tap
and will package things for shipment using it.  They also
wrap the item in fairly heavy plastic or put it inside a plastic
bag before foaming.  We have packaged and shipped several
pieces of test equipment over seas this way.

Good luck... but be careful with that Good (and nasty) Stuff !

73, Chris
--
Chris Elmquist, N0JCF
[e-mail]
[e-mail]


From [e-mail] Mon Oct 07 20:28:15 1996
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From: [e-mail] (Joe Schwob)
Newsgroups: rec.radio.amateur.homebrew
Subject: Nichrome wire
Date: 7 Oct 1996 01:41:06 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
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Message-ID: <539n3i$[e-mail]>
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I am rebuilding a very small high heat oven.  Does anyone know where I
can get Nichrome wire to complete the job?

Joe Schwob
KB8TV



From [e-mail] Mon Oct 07 20:28:17 1996
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From: Richard Hager <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted:  Test Equip
Date: Sun, 06 Oct 1996 23:48:46 -0400
Organization: Ah-ha! Design Group, Inc.
Lines: 89
Message-ID: <[e-mail]>
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Hello,

We are a manufacturer of CNC controls for machine
tools.  We'll trade brand new controls or control
components with full warranty, for test equipment.

If you've been wanting to add CNC capability to your
shop, and have some unwanted test equip sitting
around, please let us know.  This might be a good
deal for schools, universities, or large corp's with
surplus test equip on hand.  Individuals welcome also.

Items WANTED:

-Tek current probes, A6202 w/AM503 amp.  2-6 pieces.

-7104 mainframe, especially w/7A19-7A29-7B10-7B15 plugins

-2467, A, B  Tek scope w/probes.

-Modern Digital Scope.  Open to suggestions

-In-circuit emulator for 486.  must be complete & working.

-Spectrum Analyzer, standalone or 7000 type plugin
Like 491, 492, 7L5, 7L12, 7L14, etc..

-Also interested in low-freq FFT type for vibration and
control system analysis.  Like HP, Stanford Research, etc.

-RF Generator, like HP8640, etc. 1 or 2 units covering
10khz to 1ghz.

-Function gen w/lin-log sweep, minimum top freq. of 11mhz.
-Pulse Gen, 50mhz min, 100mhz prefered.  w/variable risetime.
-Sweep Gen, 1-500mhz

-Tek curve tracer, 576.  Hi-pwr fixture a plus.
577/D1 is a possible alternative.

-Tek DCS01 capture camera.

-Good universal freq/period counters, like HP5315/16, 5345, etc.

-Tek TM500 plugins for scope cal setup:
Sweep gen plugin
Time mark gen plugin
Dual trace Scope plugin
500mhz counter plugin
Leveled sine wave gen.
FGxxx function gen for TM5xx, prefer FG504.

-Tek 7000 series equip:
7A12/7A26 2-ch plugins
7A42 4-ch plugins
7B53A timebases
7B92A timebases
7T11A and 7S11 sampling plugins
7B10/7B15 timebases
7000 series cal fixtures and equip
7000 series spectrum analysers, 7Lxx

-Regular Tek scope probes, 6105, 6106, etc..

-Other equip will be considered also, for example:
Fluke 8060A DMM's or equiv.  And/or good bench DMM.
Temp measurement stuff, especially IR thermometers.
Grid Dip Meter, LCR meter/bridge, Q-meter, ???

-Also looking for some older stuff for personal
restoration project: 564B, 3T77A or any 3Tx

Please send email to address below, attention Richard.
Info on CNC controls is at the web site address below.

Thanks!

Richard
--

        Richard Hager

+ Ah-ha! Design Group, Inc.           -
+ Precision CNC Technology, since 1991 -
+ 612-641-1797, Fax: [phone]       -
+ "I just like to build stuff" So...     -
+ for CNC info, don't email me, call      -
+ or email Ah-ha! directly.  Thanks!       -
+ www.gdic.com/ahha  email: [e-mail]   -


From [e-mail] Mon Oct 07 20:28:18 1996
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From: Robert Ganter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: *********Homebrew Tube Amp*********
Date: Mon, 07 Oct 1996 12:29:49 +0200
Organization: Ascom Business Systems AG
Lines: 28
Message-ID: <[e-mail]>
References: <52p5tl$[e-mail]>
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JSmith5435 wrote:
>
> Does anyone have schematics and assembly procedures for a tube linear
> amplifier for the 10 to 60 meter bands? If so Please email me. I'm looking
> for a project that's easy to understand and build for an 18 year old with
> minimal technical knowledge.

Puuh! I am working on two linears for 2m and 70cm at the moment. My
advice: keep Your hands off a tube PA as long as You don't have
enough experience with electronics. All tube amplifiers use very high
voltages (1000V to over 3500V), which is ABSOLUTELY LETHAL. Try to start
with a low power transistor PA to get an idea. The Motorola RF databooks
have very interesting application notes about that (most from Helge O.
Granberg, K7ES).

If You definitely want to build a tube PA: the ARRL handbook has some
designs. Older ones have a design using TV deflection tubes. Advantage:
'low' Plate voltage (800V), cheap (but nowadays hard to find tubes).

Try to get advice from tube specialists. I am in luck here and I can tell
You, that I would have made everything smoking, if I hadn't have my plans
revised by some very experienced radio amateurs.

Hope this helps

Regards

Robert HB9NBY


From [e-mail] Mon Oct 07 20:28:18 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: Re: *********Homebrew Tube Amp*********
Message-ID: <[e-mail]>
Organization: Organization? Me?
References: <52p5tl$[e-mail]> <[e-mail]>
Date: Mon, 7 Oct 1996 16:24:21 GMT
Lines: 18
Sender: [e-mail]

In article <[e-mail]> Robert Ganter <[e-mail]> wr
ites:
>JSmith5435 wrote:
>>
>> Does anyone have schematics and assembly procedures for a tube linear
>> amplifier for the 10 to 60 meter bands? If so Please email me. I'm looking
>> for a project that's easy to understand and build for an 18 year old with
>> minimal technical knowledge.
>
>If You definitely want to build a tube PA: the ARRL handbook has some
>designs. Older ones have a design using TV deflection tubes. Advantage:
>'low' Plate voltage (800V), cheap (but nowadays hard to find tubes).

If you want to take the TV deflection tube approach, just consider "weird"
filament voltages. Tube types 23LQ6, 31LQ6, etc., are still readily
available at a good price (typically USD 4-10 each) from commercial
sources (such as antique electronic supply)...

73 Dave WB0GAZ [e-mail]


From [e-mail] Mon Oct 07 20:28:19 1996
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From: "miker in Tigard, OR." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: im lookin to build a 0-12v regulated power supply ,,,need schematics
Date: Mon, 07 Oct 1996 11:35:50 -0700
Organization: Hevanet Communications
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Jim wrote:
>
> Use an LM317 or similar adjustable voltage regulator on any transformer
> with a rectified no-load output less than 35 volts.
>
> You can find the schematic for this everywhere.
>
> There are also some higher current versions of the LM317 available
> if 1.5 amps isn't enough.
>
> N6OTQOne of the problems is that a 317 won't go to 0 volts without a lot
of help.  Power dissipation is a big problem at any reasonable current.
miker


From [e-mail] Mon Oct 07 20:28:20 1996
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From: [e-mail] (G6DER)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted Coaxial relays
Date: 7 Oct 1996 19:53:04 -0400
Organization: America Online, Inc. (1-800-827-6364)
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I need a couple of relays with sma conectors that are good to 10Ghz.
Anyone know of a supply of surlpus units please?
  Email to [e-mail]                  Thanks          Keith.


From [e-mail] Sat Oct 12 12:00:27 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 201-A grid leak resistors, Crosley "Pup" & other impertinences
Date: 7 Oct 96 21:20:01 EST
Organization: Wright State University
Lines: 55
Message-ID: <[e-mail]>
NNTP-Posting-Host: desire.wright.edu

Ok, so now I understand how the grid leak leaks and how the
resistors resist, but I still don't understand this old radio.
Youze may remember that I'd picked up a home-brew one-tuber
at a local antique fleas market. It had an 201-A in it... and
the tube even still has a filament. But it had been rewired
a couple times (I figure) and someone had stuck a 1/4" phone
jack in the front panel.

So here's the deal(s): What is the composition of Ebonite?
I figure that the front panel is Ebonite, but it's kinda
like been bleached or something. It's now kinda brownish/tan
color, but under the knobs and on the inside of the box it's
black. So I figure that it's Ebonite. Seems fairly heat
resistant. (I'd replace it with tempered Masonite, but for
I wanna have evidence when I croak that I did not destroy a
family hairloom to fix it up.)

2. I had to desolder the grid leak C&R pair from one of the
capacitors and put it back on the board what the radio was
built on. Only one problem: the resistor measures about 2.5 k
instead of 2 M Ohms. It's one of them old-fashioned thangs with
a green body, a dot of brown in the middle and a dot of black
on one end. (And yes, I do have old books to see what it was
s'possed to be.) SO... if the tube is a 201-A (like it says
on the base), am I asking too much that the grid leak resistor
be 2 Megohms?  I can't figure that a garden variety triode
like the 01-A or a 45 (I think it is) had such a grid cut-off
point that it'd use a 2.5 kOhm as a grid leak. Any hints?

3. The panel has two variable caps and two sets of switch
points for taps on the coil. I hooked the beast up with antenna
straight to one set of taps (the ones closest together) and
rigged the two caps like in the MRL #2 crystal set. That meant
that the other set of taps (more widely spaced) let me tune the
500-1600 kHz range and hear pretty much like a crystal set (with
a 1N270 diode instead of the tube...I ain't that far along yet).
Seems to work. I'm now having to consider finding a vintage
RFC and plate RF by-pass capacitor, among other follies, in
order to at least get close to what this beast might have been.
SOmeone suggested the Crosley "Pup." Anyone wanna front me a
copy of a schemo for one of them puppies?

4. All suggestions to take this to rec.radio.antique.old.geezer.
brainless.pioneer.wacko have been followed. That's why I'm
back here: t' pester yew young pups lack yer parints shoulda
in da first place if they hadn't kept me from my tapioca. SO
there!

73
Nils
WB8IJN &c
(I just found out that the Hallicrafters S38E that I had as
a kid is now considered a "vintage" radio! Damn, I ain't that old!)




From [e-mail] Sat Oct 12 12:00:28 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!homer.alpha.net!usenet
From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 6M amp using 4-1000A ?
Date: Sun, 06 Oct 1996 14:59:37 -0700
Organization: Aero Head Aviation
Lines: 17
Message-ID: <[e-mail]>
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Anybody have a good design for using a 4-1000A tube on 6 Meters? I plan
to drive it with 50 Watts from my Kenwood TS-690S.  With the available
drive, I guess it would be better to run grounded grid?  If so, would it
be possible to get around 800-1000 Watts out with this amount of drive?
I've seen a design (common cathode) that drives the grid with 10 Watts
and 1000 out or so. I'm leery of the design as I might forget to lower my
output to 10 Watts and fry my 4-1000A.  Worst case, I'd like something
that could take the full 50 Watts of drive and give me anything above
about 700 Watts out.  Any good ideas?  Fax a schematic to me at
608-634-2594 or contact via email to arrange other methods of getting
info to me ([e-mail]).  Thanks...this will be my winter
project...N0EDV.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 12 12:00:29 1996
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From: Ramon Gandia <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6M amp using 4-1000A ?
Date: Sun, 06 Oct 1996 23:00:36 -0800
Organization: Anvil Technology
Lines: 57
Message-ID: <[e-mail]>
References: <[e-mail]>
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To: scott <[e-mail]>

scott wrote:
>
> Anybody have a good design for using a 4-1000A tube on 6 Meters? I plan
> to drive it with 50 Watts from my Kenwood TS-690S.  With the available
> drive, I guess it would be better to run grounded grid?  If so, would it
> be possible to get around 800-1000 Watts out with this amount of drive?
> I've seen a design (common cathode) that drives the grid with 10 Watts
> and 1000 out or so. I'm leery of the design as I might forget to lower my
> output to 10 Watts and fry my 4-1000A.  Worst case, I'd like something
> that could take the full 50 Watts of drive and give me anything above
> about 700 Watts out.  Any good ideas?
> Gotta FLY or gonna Die !
>     Ask me about my
>  Aeronca Super Chief !

I've flown one of those!

Okay, with just 50 watts you do not want grounded grid, but actually
drive your 4-1000 grid.  This could be a very simple circuit.

On grounded grid you would need an input tuned circuit; you will not
need this on grid driven with 50 watts to spare.  You could do
this:

Calculate if 50 watts across 50 ohms is enough voltage to drive the
4-1000.  If it is, then put a 50 ohm dummy in the amplifier and
hook your grid to it, via a capacitor so you don't short out the
bias voltage, which has to be fed via a choke.  Or, you could
do it the other way, feed the bias to the grid via the 50 ohm
resistor.  Put a bypass capacitor from the bias supply end of the
resistor to ground.  The hot end (grid end), connect to the
center conductor of your input coax connector with a capacitor to
block DC.  A good mica capacitor of 500 pf, or .001 mf will do.
Check to make sure it does not get hot in operation, and check your
input swr.

If your calculations indicate that you cannot develop the rf voltage
at the grid, you will need to find out what resistance with 50 watts
across it will work.  Say it needs 200 ohms.  Do all the above steps,
except between the amplifier and the exciter you need a ferrite
unun, or unbalanced to unbalanced rf transformer.  These can be bought,
or you can wind one up with a little toroid core.  Instructions in
the ARRL handbook and Antenna Book.  Don't use a Balun.  It must be
Unun.  Possibly the simplest is to wind several turns of wire on the
toroid core, hot end to the capacitor feeding the grid, other end
to ground.  Tap the coax connector on the windings until you find the
magic spot of 1:1 swr.  Test the swr at low power with the 4-1000
amp off.

The 4-1000A might be a bit marginal for efficiency at 50 mHz.  Have
you checked this?  The resistive input circuit I described will give
you very stable operation, but be sure your filaments are properly
bypassed to ground for VHF, and so is the screen, or it will break
into oscillation and commit Hara-Kiri before you can reach the
big switch!

Ramon.  AL7X, Nome, AK.  ---> e mail replies to:   rfg.at.nome.dot.net


From [e-mail] Sat Oct 12 12:00:30 1996
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From: [e-mail] (Thomas Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: ?CRYSTAL FILTER SUPPLIERS?
Date: Fri, 11 Oct 1996 20:13:31 GMT
Organization: Island Internet Inc. - [phone]
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Greetings All:

        I would like to obtain an off-the-shelf crystal filter for a
project I am working on. I have checked Digi-Key and Allied and
neither carry a line of good quality crystal filters.

        For my application I may be able to utilize a  10.7 MHz 12 KHz
BW NBFM 8 pole filter. A list of available filters to browse through
would be nice.

        Does anyone have any suggestions for known sources of crystal
filters???

        Thanks in advance for any help!


Very Best Regards: Thomas M. Alldread
E-mail:            [e-mail]
packet radio:      VE7TMA@VE7KGW.#NVI.BC.CAN.NA


From [e-mail] Sat Oct 12 12:00:31 1996
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From: Jeff King <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: Thu, 10 Oct 1996 16:07:35 -0500
Organization: C4 Systems, Inc. - Northern suburbs of Macon, MI
Lines: 41
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Jake Brodsky wrote:
>
> SteveBragg wrote:
> >
> > Does anybody do homebrew amateur radar?  I know there's got to be a FEW of
> > us out there...
> > Reply if you're a "radar hack" like me.  Here are some things I'm
> > interested in:
> >
> > 3.5, 5.7, 24 GHz amateur bands
> > Pulse radar
> > Rocket tracking
> > Monopulse and sequential lobing techniques
> > Using used radar equipment
> > New developments in DSP for IF processing.
> >
>
> Tony, N3JLI, and I were discussing topics such as this.  I own a pair
> of MA/COM Gunnplexers.  I was thinking of using them in some kind of
> chirp radar arrangement.  Tony lives near Baltimore, I live near
> Washington.  If you're anywhere near this area, we'd be interested
> in corresponding with you.  We are well equipped to try building
> something, should curiousity get the better of us.

In one of the Gunnplexer "CookBooks" there is a section about making a
Gunnplexer into a radar unit. I believe it chirps it as you suggest.
Supposedly you could get good reflections off nearby rain bearing
clouds. Or so the author claimed.

Not sure if the rules make this legal, but no reason you can't use
"radar" on the lower bands as well. What you lose in resolution you
make up for a bit easier time doing things, at least to start. In
fact, I think the British used a low VHF band in there first radars.

'DSP' techniques really can help us here.... might be a good front
end for a radar unit that talks to a PC based display terminal.

Another neat thing amateurs could do is put cube reflectors on there
balloon launches. Or mapping the ionosphere.

-Jeff wb8wka


From [e-mail] Sat Oct 12 12:00:35 1996
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From: Douglas Dwyer <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: Thu, 10 Oct 1996 10:04:13 +0100
Organization: fp
Lines: 27
Distribution: world
Message-ID: <[e-mail]>
References: <536pvq$[e-mail]> <[e-mail]>
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In article <[e-mail]>, Allen Wallace <allen_wallace@p
owertalk.dtint.com> writes
>In article <536pvq$[e-mail]> SteveBragg,
>[e-mail] writes:
>>Does anybody do homebrew amateur radar?  I know there's got to be a FEW of
>>us out there...
>>Reply if you're a "radar hack" like me.
>
>I'm intrested in this! I want to make a remote DF for 121.5 Mhz ELTs,
>using no moving parts, using monopulse DF. I also dabble in lots of
>microwave misc. I'd love to bounce several of my ideas off of a group of
>hams like you!
I am attracted to the possibility of passive radar.
There was an article in UK Electronics and Wireless World some years
back that involved picking up a direct radar pulse , synchronising your
own receiver from this and then processing the returns. Such a system
seems fairly uncomplicated.
An alternative requiring some processing power and two or more antennas
would employ one or more TV station signals. The system could be
operated like a parabplic mavigation system or TV modulation employed to
to determine distance (delay of shadow).

Douglas Dwyer FP Ltd Shorts Farm Northlew Okehampton Devon EX20 3NR UK
Tel[phone]
Stop by http://ourworld.compuserve.com/homepages/Frequency_Precision/  for
information on Precision Frequency, Crystals OCKOs TCXOs and
more.


From [e-mail] Sat Oct 12 12:00:36 1996
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From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna Coax Routing Ideas Needed
Date: Thu, 10 Oct 1996 23:41:55 -0700
Organization: Aero Head Aviation
Lines: 42
Message-ID: <[e-mail]>
References: <[e-mail]>
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I have wood siding on our new (to me too!)webbte wrote:
>
> The subject may be a misnomer. Since buying a new (to me) house,
> I have pondered the eternal question of how and where to route 4
> coax lines and 1 rotor control cable. I've considered (and
> rejected) the old "remove a pane of glass, substitute plexiglas
> and route connectors thru it" method because I'm working with
> both internal and storm window setup. The other method is either
> through the attic or under the floor in the crawl space (shack
> is on first floor) but the delimma is how to feed into shack.
> I've checked the only catalogs currently available to me for
> connector feedthru arrangements on both sides of an aluminum
> plate attached to either floor or ceiling but can't find what
> I'm looking for. Admittedly, my collection of catalogs is meager
> at the moment having cleaned house (at XYL's insistance prior to
> moving). I know a solution exists for a "clean" arrangement.
> Anyone have a solution or point me in the right direction? Any
> help would be appreciated. I've already missed almost a years
> worth of DX chasing and "Closet Contesting" work and my shack is
> still in storage for another 2 weeks or so. I'd like to get this
> setup complete before the furniture arrives.
>
> Thanks for any help.
>
> 73 / ted  w4NE (ex-AC4CS/WA4KWG)
I have wood siding on our newly acquired house and I will be drilling a 1
1/2" hole through the siding and attatching an electrical "LB Box" to the
outside of the siding and running the coax into the house.  Then I will
be mounting an electrical junction box in the wall (it will basically
look like a box that would hold two regular electrical outlets, but has a
solid metal cover on it that will be drilled and have 4 UHF or "N"
bulkheads {Barrel connector with threads all the way so it can but
fastened with nuts on both sides of the metal plate] on it with jumpers
of coax running to the rigs.  Sounds complex, but just take a visit to a
building supply store and look at all the electrical stuff and you will
get lotsa good ideas.  Good luck!  73, Scott, N0EDV...The voice of Vernon
County (Wisconsin)!

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 12 12:00:37 1996
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From: "Peter Gottlieb" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Car battery (13.8) to
Date: 11 Oct 1996 01:34:29 GMT
Organization: Altopia Corp. - Affordable Usenet Access - http://www.alt.net
Lines: 20
Message-ID: <01bbb714$745b73c0$02102399@peter-s>
References: <52r7si$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
X-Newsreader: Microsoft Internet News 4.70.1155

> In general, you CAN'T get 12.0V out of a car battery using a linear
> regulator unless you plan on leaving the motor running and use a
> PNP pass transistor or very low drop-out regulator.
> Also, in an automotive environment, you  need to worry about protection.
> Sticking an IC on the +13.6V line is likely to eventually end up a
shorted device.
> Use some inductance and a big cap in addition to the protection diodes
> required by the regulator itself.
> Thre's a lot more to this than meets the eye.
> miker
>


He's right.  If you really need to get precisely 12.0 Volts you will need a
switching power supply.  Then you can set it up to run from 8 to 16 V or
so.  Protect the input; you can protect from severe transients with a fuse
then a 18 or 20 V beefy Zener, or just LC it with a big C.

Do you really need 12.0 Volts?  or just well filtered 13.6?



From [e-mail] Sat Oct 12 12:00:38 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Rob Janssen)
Subject: Re: Car battery (13.8) to 12.0V DC regulaotor?
X-Newsreader: NN version 6.5.0 (NOV)
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Organization: PE1CHL
Message-ID: <[e-mail]>
References: <52r7si$[e-mail]> <5332e8$[e-mail]>
Date: Mon, 7 Oct 1996 09:19:27 GMT
Lines: 20

In <5332e8$[e-mail]> [e-mail] (Mustang Maniac) write
s:

>I'm curious... why do you need exactly 12.0 Volts?

>What you're asking for will be mighty difficult to do properly.  Regulators
>require an input of at least a couple of Volts higher than the desired out-
>put to maintain regulation.  A car battery will not provide this unless you
>are charging it at the same time with a higher voltage.  A fully-charged car
>battery will be around 14 Volts, and it discharges to less than that, so the
>regulator will not be able to maintain regulation.

Special "low drop" versions of the regulators exist that don't have
this problem.  For example the "48xx" series with similar type numbers
as the standard "78xx" series regulators.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Sat Oct 12 12:00:39 1996
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From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Car battery (13.8) to 12.0V DC regulaotor?
Date: 7 Oct 1996 15:42:37 GMT
Organization: Netcom
Lines: 33
Message-ID: <53b8dd$[e-mail]>
References: <52r7si$[e-mail]> <5332e8$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hou-tx5-13.ix.netcom.com
X-NETCOM-Date: Mon Oct 07 10:42:37 AM CDT 1996

In <[e-mail]> [e-mail] (Rob Janssen)
writes:
>
>In <5332e8$[e-mail]> [e-mail] (Mustang
Maniac) writes:
>
>>I'm curious... why do you need exactly 12.0 Volts?
>
>>What you're asking for will be mighty difficult to do properly.
Regulators
>>require an input of at least a couple of Volts higher than the
desired out-
>>put to maintain regulation.  A car battery will not provide this
unless you
>>are charging it at the same time with a higher voltage.  A
fully-charged car
>>battery will be around 14 Volts, and it discharges to less than that,
so the
>>regulator will not be able to maintain regulation.
>
>Special "low drop" versions of the regulators exist that don't have
>this problem.  For example the "48xx" series with similar type numbers
>as the standard "78xx" series regulators.
>
>Rob
>--

Are we making this a bit complex?  If the load is consistant .ie a
specific application wouldn't a simple crowbar regulator
with a 12 volt zener diode work?

Sparky  KI5GY



From [e-mail] Sat Oct 12 12:00:43 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!news3.agis.net!agis!NEWS!not-for-mail
From: Bob Lewis <[e-mail]>
Subject: Re: Car battery (13.8) to 12.0V DC regulaotor?
Message-ID: <[e-mail]>
Date: Mon, 07 Oct 1996 12:06:15 -0400
References: <52r7si$[e-mail]> <5332e8$[e-mail]> <[e-mail]>
Organization: AA4PB
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Rob Janssen wrote:
>
> In <5332e8$[e-mail]> [e-mail] (Mustang Maniac) wri
tes:
>
> >I'm curious... why do you need exactly 12.0 Volts?
>
> >What you're asking for will be mighty difficult to do properly.  Regulators
> >require an input of at least a couple of Volts higher than the desired out-
> >put to maintain regulation.  A car battery will not provide this unless you
> >are charging it at the same time with a higher voltage.  A fully-charged ca
r
> >battery will be around 14 Volts, and it discharges to less than that, so th
e
> >regulator will not be able to maintain regulation.
>
> Special "low drop" versions of the regulators exist that don't have
> this problem.  For example the "48xx" series with similar type numbers
> as the standard "78xx" series regulators.
>
> Rob
> --
> +------------------------------------+--------------------------------------
+
> | Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob
|
> | AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU
|
> +------------------------------------+--------------------------------------
+

13.8 to 12V yes. Battery will eventually drop to 12V (or less) after
charging stops - then you need a zero drop regulator.

The only possibility is and "inverter" type circuit that would increase
the 12 volts to something higher and then regulate it back down to 12
volts again.



From [e-mail] Sat Oct 12 12:00:45 1996
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From: Ramon Gandia <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB Radio to 10 meter
Date: Sun, 06 Oct 1996 22:47:16 -0800
Organization: Anvil Technology
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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Gary Tait wrote:
>
> On Wed, 2 Oct 1996, Susan Driggers wrote:
>
> > I have heard that it is possible to convert a cb to 10 meter . Is this
> > possible and if so where can I get more information on this. Thanks.
>
> Yes it is possible. check through back issues of QST and 73 , to find some
> info.
>
> Depending on the rig ,it might be harder because some PLLs are designed
> for CB use only.

For the most part they do not make good ham 10 meter rigs.  They
are channelized, so they do not have continuous coverage.  Also,
they are mostly a.m. sets, although there are ssb ones out there.
Most of the ssb sets are not very good.  The filters are broad as
there is no close by interference on CB...only the next channel
which is pretty far away.  They have no provisions for CW.  Their
power is low.  They are "built to a price" and usually are not very
reliable.

Ramon AL7X  ---> e-mail reply to:   rfg.at.nome.dot.net


From [e-mail] Sat Oct 12 12:00:46 1996
From: [e-mail] (Jonathan Clough)
Subject: Re: CFS & CFJ Murata ceramic filters
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Mon, 07 Oct 96 10:59:49 GMT
Organization: Javiation, Bradford, U.K.
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In article <[e-mail]> [e-mail]  writ
es:


Joe,

> Does anyone know of a supplier of the full range of CFS or CFJ Murata
> filters, preferably in the UK? I know Cirkit sell them, but their
> range is limited; the narrowest one they sell is 1 khz, while I am
> looking for 300hz or 500hz. I would also like to find a supplier of

Murata in the UK are in Fleet. Phone number is 01252 811666 but unless you
want to open an account with a turnover of several K you won't get
very far :-(

There are several distributors who you could try. Eurodis/HB Electronics
(01204 555000) being one in Bolton although Murata should be able to point to
more local
ones (if your not in the NW !)

If you know the specific filter you are after Murata should be able to
tell you which distributors have or have had that particular item. If Murata
or a distributor have no stock you will probably be stuck with minimum order
via a distributor for a few hundred pieces.

> Collins mechanical filters and Hy Q  or similar crystal filters.
> Again, I know these are sold by manufacturers such as AOR or Kiwa, but
> they seem to rather more expensive than they should be, as they are
> sold as spares or accessories for their products.

Even if you do find distributors with stock they may well be rather more
commercial that you wish and have minimun order value or qty in which case
getting the single units from AOR and the like can be your best bet.


Good luck with your projects.

--
Cheers,
 /-------------------------------------------------------------------------\
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 \-------------------------------------------------------------------------/


From [e-mail] Sat Oct 12 12:00:47 1996
Path: news2.epix.net!news3.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.callamer.com![e-mail]
From: [e-mail] (Jerry Parker)
Newsgroups: rec.radio.amateur.homebrew
Subject: DAN'S SMALL PARTS
Date: Fri, 11 Oct 1996 20:04:20 GMT
Organization: Call America Internet Services  [phone]
Lines: 24
Message-ID: <53m93j$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: lts2-053.snlo.dialup.fix.net
X-Newsreader: Forte Free Agent 1.0.82

Recently someone posted to this News Group that Dan's Small Parts is
out of business.


This could not be farther from the truth.

DAN'S SMALL PARTS AND KITS  IS IN BUSINESS

He even has an internet catalog:

                http://www.fix.net/dans.html


Phone:  [phone]

Dan carries many small hard to get items at very very

reasonable prices.


CHECK HIM OUT.....

73'es,,,,Jerry...WA6OWR...K



From [e-mail] Sat Oct 12 12:00:48 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!imci4!newsfeed.internetmci.com!feed1.news.erols.com!howland.erols.net!surfnet.nl!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Data over HAM radio?
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <01bbb326$8dfcba60$[e-mail]>
Date: Sun, 6 Oct 1996 11:00:06 GMT
Lines: 23

In <01bbb326$8dfcba60$[e-mail]> "JaiDeeZ" <[e-mail]
m> writes:

>Umm, I really know VERY little about Ham and stuff, but a friend and I are
>looking to get into it, and we would like to set up a computer network over
>the radios, probably using packet i suppose. So, does anyone know of any
>good web sites that have information on this? Or companies I could get
>catalogs from? What agencies do I need to contact to get certified for this
>stuph? Thank (_)!!!!!

Ham radio is not what you are looking for.
It is about experimenting with radio, making contacts with other people,
and maybe having a digital network as a side-effect.

When you just want to setup a computer network, don't go for ham radio.
Instead, buy wireless networking equipment that complies with your
local regulations for these things.
On thw web, look for things like "NCR wavelan".

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Sat Oct 12 12:00:49 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!munnari.OZ.AU!news.mel.connect.com.au!news.ade.connect.com.au!news.adelaide.on.net!highlander.senet.com.au!usenet
From: [e-mail] (chris)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Does anybody know what a D2824C is?
Date: Fri, 11 Oct 1996 10:59:57 GMT
Organization: SE Network Access Pty Ltd
Lines: 51
Message-ID: <53l9jp$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Mark Zenier) wrote:

>in <[e-mail]>, Dan Puckett wrote:
>: I've been playing at converting a Rat Shack CB to 10 meters.  The PLL in
>: the synthesizer is marked D2824C  with what looks like a manufacturer's
>: logo that is a stylized "NPC".  What is this little beast?

>My first guess would be that it's a poorly formed label for a NEC chip.

>Only way to find out is to get the manual.  Something that Radio Shack
>is really pretty good at

The radio is made my Uniden.  There are 2 versions of the chassis, one
a "compact", the other a larger "full size" board - but the circuits
are basically indentical electrically.

The 2824 is the PLL synth chip, ROM encoded with only the 40
FCC channels, corrosponding to a count of ≈91 up to ≈135.
A ≈2 output is also there, which is tripled and mixed with the
VCO to yield the 0.91 Mhz to 1.35Mhz signal used to lock
the PLL loop.

There are two ham-mod methods.  First one is to add an
external (from an added crystal osc) signal to the tripler's
output... but this has three problems.  One, you'll be limited
to 40 channels, gaps/skips/etc and all - and two, as the
clarifier works on the 10.24 ref xtal, the clarifier range will
be *severely* reduced.  Three - the USB/LSB offset works
the same way as the clarifier, so you'll need a slightly
different crystal for LSB if you intend to use it as well
as the usual USB.

Second method - add another PLL.  The Upd858 will
cover at least the bottom part of 10m before the
counters run out of steam, and a motorola MC145151
will allow full 5Khz step coverage from 26 to 32 Mhz.
The clarifier and lsb/usb offsets will function correctly.

Note that the original PLL chip is left in, as it's tripler
and downmizer functions are retained - the second PLL
is added and runs alongside the original one.

Email me ([e-mail]) if you need more info.

Good luck!

Regards,
Chris.





From [e-mail] Sat Oct 12 12:00:50 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!EU.net!uunet!news-in2.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: Ethernet Coax for ham use
Date: Fri, 11 Oct 1996 12:02:51 -0400
Organization: Bruce Municipal Telephone System
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ns.primeline.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

On Thu, 10 Oct 1996, David Sipe wrote:

> Tom Watson wrote:
> > fact that I have a spool of a few feet of nice 10-BASE-5 ethernet coax
> > (yellow double shielded stuff) a few questions:
>
> If this is what is commonly known as "thinnet" coax for ethernet, it is
> RG-58.  Very lossy at 2M.
>
> --
> 73  David   KD6QFZ
> [e-mail]

The thin cable is 10 BASE-T ,not 10-BASE-5 (Thicknet),although I don't
know of it's suitability for VHF radio work eiither.

Gary Tait , VE3VBF
Sorry for snipping. My newsserver won't let me post less new lines than
old.



From [e-mail] Sat Oct 12 12:00:51 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!EU.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Jack Taylor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: 11 Oct 96 15:56:11 GMT
Organization: ucsd usenet gateway
Lines: 7
Message-ID: <11197@NJ7P>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I recently evaluated a section of orange 1/2 inch ethernet coax.  It's
very good, loss characteristics quite close to foam RG-8 with a measured
attenuation of 4 dB per 100 ft at 450 MHz.  This section was triple shielded
with a measured VF of .77.
73 de Jack




From [e-mail] Sat Oct 12 12:00:52 1996
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!gatech!csulb.edu!news.sgi.com!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsjunkie.ans.net!newsfeeds.ans.net!nuhou.aloha.net!not-for-mail
From: [e-mail] (Lawrence M. Koga)
Newsgroups: rec.radio.amateur.homebrew
Subject: FLECTRON?
Date: 9 Oct 1996 18:36:42 GMT
Organization: Hawaii OnLine - Honolulu, HI
Lines: 11
Message-ID: <53grbq$[e-mail]>
NNTP-Posting-Host: haleakala.aloha.net
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]

Hi All,  Anyone out there us FLECTRON(sp)?  It is manufactured by 3M.

FLECTRON is a fabric imbedded with conductive material.  It is used as
RFI/EMI shield for the military.  It looks and feels like very thin
polyester cloth.  It is reported to have great db attenuation.

I have called 3M for a price.  I understand that it is very expensive.

Any info would be appreciated.

Thanks, Lawrence


From [e-mail] Sat Oct 12 12:00:53 1996
Path: news2.epix.net!news3.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!nntp.earthlink.net!usenet
From: James McKellips <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: Tubes 6360 & 6939
Date: Fri, 11 Oct 1996 20:56:15 -0400
Organization: McKellips Printing & Design
Lines: 8
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: cust49.max12.washington.dc.ms.uu.net
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I have approx. 15-20 each of the 6360 & 6939, that are pulls from
government equipment from the 1970s. Tested good in the 1980s. Make
offer to [e-mail]
Thanks,
Jim McKellips
WB6NFT




From [e-mail] Sat Oct 12 12:00:53 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!surfnet.nl!swidir.switch.ch!news.rccn.net!news.ist.utl.pt!alfa.ist.utl.pt!l38217
From: [e-mail] (Pedro Pedroso)
Newsgroups: rec.radio.amateur.homebrew
Subject: Heil Mic on Icom  ?
Date: 8 Oct 1996 11:55:10 GMT
Organization: Instituto Superior Tecnico
Lines: 20
Message-ID: <53dfeu$[e-mail]>
NNTP-Posting-Host: alfa.ist.utl.pt
X-Newsreader: TIN [version 1.2 PL2]


        Hello to all !
        I'm planning to buy an Heil HC-4 for contest operation, but I've
        been told that the HC-4 cannot be conected directly to an Icom
        transceiver because it needs a capacity to adapt.
        Since I own an IC-725, I would like to know the value of the
        capacitor and if it is connected in paralell or series.

                        73 + Good DX + Good Contest !

--


 | Pedro Pedroso                        |                            |
 | [e-mail]               |  CT1ELP                    |
 | Eng. Electrotecnica e Computadores   |  Founder member of GPDX    |
 | (Telecomunicacoes e electronica)     |                            |
 ---------------------------------------------------------------------
 | Address: P.O.Box 116 , 2806 Almada Codex , PORTUGAL               |
 ---------------------------------------------------------------------


From [e-mail] Sat Oct 12 12:00:54 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!howland.erols.net!EU.net!news-peer.gsl.net!news.gsl.net!swrinde!ihnp4.ucsd.edu!news.encore.com!psoper
From: [e-mail] (Pete Soper)
Subject: Re: Heil Mic on Icom ?
Organization: Encore Computer Corporation
Date: Tue, 8 Oct 1996 15:45:13 GMT
Message-ID: <[e-mail]>
X-Nntp-Posting-Host: sysgem1.encore.com
References: <53dfeu$[e-mail]>
Sender: [e-mail] (Usenet News)
Lines: 26

Hello Pedro,

[e-mail] (Pedro Pedroso) writes:

>       Hello to all !
>       I'm planning to buy an Heil HC-4 for contest operation, but I've
>       been told that the HC-4 cannot be conected directly to an Icom
>       transceiver because it needs a capacity to adapt.
>       Since I own an IC-725, I would like to know the value of the
>       capacitor and if it is connected in paralell or series.
>                       73 + Good DX + Good Contest !

Hello Pedro,
        I use an HC-4 element with an IC735. A .047 or .1uf capacitor
should go in series with the microphone element to isolate it from the
8 volt DC supply voltage that is fed through the mike line. This is
the purpose of the capacitor. As long as it is large enough to pass
audio frequencies, all is well. If it is too small a value it will
attenuate low frequencies (which the HC4 already does, so this would be
 too much).
        Will be searching for you 26th-28th, or if we get our amplifier
working maybe you'll find us first!

Regards,
Pete
KS4XG (W4ATC during CQWW)


From [e-mail] Sat Oct 12 12:00:55 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsxfer.itd.umich.edu!news2.acs.oakland.edu!newsgw.mica.net!news.c4systm.com!news
From: Jeff King <[e-mail]>
Newsgroups: comp.modems,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Help re simplex mode for high speed modem
Date: Thu, 10 Oct 1996 13:46:40 -0500
Organization: C4 Systems, Inc. - Northern suburbs of Macon, MI
Lines: 57
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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To: "T.A.Holden" <[e-mail]>, [e-mail]
Xref: news2.epix.net rec.radio.amateur.digital.misc:19612 rec.radio.amateur.equipment:40513 rec.radio.amateur.homebrew:20081

T.A.Holden wrote:
>
> I am still looking for help in forcing a simplex high speed connection with
Hayes
> AT compatible (or other) modems.

If the Hayes has "FAX" modes, try them. Like V.29 or something. I've
done
amateur radio links
using v.29 (which is the standard 9600bps mode) and it works fairly
well.
You'll need to use fairly long txd's.... something on the order of 400ms
due to the train sequence it sends, but other then that it works well.
You will need to make sure you audio is not clipping however as V.29
is 16 level QAM. The train sequence is (I think) about 250ms plus
another 150ms for the radio to stabilize. There is a fast train mode
you can use which is only 50ms long.

V.29 is a half duplex data modem standard. Center carrier is
1800hz. Some of the results I had got written up in QEX and
TAPR PSR a number of years back. Also, the Japanese have
done some work with this as well. They (I think) were using
the Rockwell chip set... I was using the Yamaha chip. I little
write-up is on the PRUG homepage (sorry, don't know the URL).
They (the Japanese) have also done some work with V.27 (7200bps)
which is a little more robust in a radio enviroment then V.29.

I've not tried the 14.4 fax modes.

>
> Rob Janssen wrote:
>
>
> " So, you can only use a highspeed modem on radio (I suppose that is what
>   you are after) when the radio path is fullduplex so the modems can hear
>   eachother all the time.  And even then it probably won't work too well,
>   because a radio path has distortions (due to multipath, changing propagati
on
>   etc) that a telephone modem is not designed to cope with."
>
> Agreed. However, I am thinking of using a stable, high quality but unidirect
ional voice
> (or wider) channel.
>

On slowly "fading" channels, you shouldn't have much problem assuming
you re-train
frequently. Actually, its been my experince that a radio channel is
better in most
cases then a telephone channel. Now, I am talking about a properly
engineered link
with clearences in the fresnel zones. This of course is a VHF/UHF link,
not HF or
some "HT" style rubberduck packet station.


Good luck

-Jeff wb8wka
mailto:[e-mail]


From [e-mail] Sat Oct 12 12:00:57 1996
Newsgroups: comp.modems,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!newspump.sol.net!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!server1.nw.ixe.net!server1.adam.ixe.net!wirehub!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Help re simplex mode for high speed modem
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
Date: Thu, 10 Oct 1996 21:45:57 GMT
Lines: 33
Xref: news2.epix.net rec.radio.amateur.digital.misc:19614 rec.radio.amateur.equipment:40516 rec.radio.amateur.homebrew:20084

In <[e-mail]> "T.A.Holden" <[e-mail]> writes
:

>  No.  Highspeed modems talk to eachother at connection setup, and measure
>  the line characteristics to compensate for frequency and phase characterist
ics.
>  This is the warbling noise that you hear before CONNECT appears."

>Good point. So a forced connect speed does not preclude this negotiation?

No, it doesn't.  Speed negotiation is only a very small part of this
process.  The remainder is referred to as "training" and needs to be done.

>Is there not some test mode with which the modulator can be used at high spee
d
>without detection of remote carrier and negotiation?

Training is always required in these multi-phase multi-level modulation
schemes.  Even FAX modes, which are largely unidirectional, use training.
A slow (300 bps) fullduplex negotiation phase is used to coordinate the
training, the remainder of the transfer is unidirectional.


>Agreed. However, I am thinking of using a stable, high quality but unidirecti
onal voice
>(or wider) channel.

To use standard telephone modems you will need a backward channel.
When you design everything from scratch (or: at least the operating firmware)
you might be able to come up with some protocol that does the training
with only a single direction.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Sat Oct 12 12:00:58 1996
Newsgroups: comp.modems,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Help re simplex mode for high speed modem
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Thu, 10 Oct 1996 08:57:24 GMT
Lines: 22
Xref: news2.epix.net rec.radio.amateur.digital.misc:19615 rec.radio.amateur.equipment:40522 rec.radio.amateur.homebrew:20090

In <[e-mail]> "T.A.Holden" <[e-mail]> writes
:

>Is it possible to setup a modem through the AT commands to transmit at
>high data rate in the absence of a receive carrier? I have succeeded at
>low data rate (300 bps) using analog loopback followed by digital
>loopback but cannot force a higher data rate.

No.  Highspeed modems talk to eachother at connection setup, and measure
the line characteristics to compensate for frequency and phase characteristics
.
This is the warbling noise that you hear before CONNECT appears.

So, you can only use a highspeed modem on radio (I suppose that is what
you are after) when the radio path is fullduplex so the modems can hear
eachother all the time.  And even then it probably won't work too well,
because a radio path has distortions (due to multipath, changing propagation
etc) that a telephone modem is not designed to cope with.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Sat Oct 12 12:00:59 1996
Newsgroups: comp.modems,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.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 re simplex mode for high speed modem
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Fri, 11 Oct 1996 14:10:56 GMT
Lines: 36
Xref: news2.epix.net rec.radio.amateur.digital.misc:19619 rec.radio.amateur.equipment:40538 rec.radio.amateur.homebrew:20103

In article <[e-mail]> "T.A.Holden" <[e-mail]
> writes:
>Is it possible to setup a modem through the AT commands to transmit at
>high data rate in the absence of a receive carrier? I have succeeded at
>low data rate (300 bps) using analog loopback followed by digital
>loopback but cannot force a higher data rate.
>
>Any ideas? Would appreciate e-mail and others may want posting. Thanks.

Telephone modems faster than 2400 baud go through a training and
negotiation phase at connection startup. This can't be bypassed by
an AT command. However you can use what is called a "short haul"
modem. These are designed to operate over leased lines and expect
a consistent EQ, hence they don't train and negotiate. Immac carries
several brands of these short haul modems. 9600 baud units are common,
and fairly cheap, faster units are available. They expect a 4-wire
interface, thus they should work on a good voice grade radio circuit.
(They can't deal with multipath, however.)

It *is* possible to force a Group 3 FAX modem to work on the radio
channel. There is a test mode for some of these which allows them to
go on-line without training. This can give you 9600 baud data. Some
amateurs in Japan experimented with this for a while. It's not an
AT command, however, you have to actually strap pins on the modem
chip to put it in test mode.

For robust operation on a radio circuit, you really need a radio
modem. And for speeds over 2400 baud, you really need a data radio
and not a voice radio kludge. Not only does this work better, it's
usually cheaper too.

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 Oct 12 12:01:00 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!ott.istar!istar.net!tor.istar!east.istar!ftn.net!news
From: "T.A.Holden" <[e-mail]>
Newsgroups: comp.modems,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Help re simplex mode for high speed modem
Date: Thu, 10 Oct 1996 10:14:43 -0400
Organization: Canadian Broadcasting Corportaion
Lines: 43
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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Xref: news2.epix.net rec.radio.amateur.digital.misc:19620 rec.radio.amateur.equipment:40539 rec.radio.amateur.homebrew:20104

I am still looking for help in forcing a simplex high speed connection with Ha
yes
AT compatible (or other) modems.

Rob Janssen wrote:

" In <[e-mail]> "T.A.Holden" <[e-mail]> writ
es:

  'Is it possible to setup a modem through the AT commands to transmit at
   high data rate in the absence of a receive carrier? I have succeeded at
   low data rate (300 bps) using analog loopback followed by digital
   loopback but cannot force a higher data rate.'

  No.  Highspeed modems talk to eachother at connection setup, and measure
  the line characteristics to compensate for frequency and phase characteristi
cs.
  This is the warbling noise that you hear before CONNECT appears."

Good point. So a forced connect speed does not preclude this negotiation?

Is there not some test mode with which the modulator can be used at high speed

without detection of remote carrier and negotiation?


" So, you can only use a highspeed modem on radio (I suppose that is what
  you are after) when the radio path is fullduplex so the modems can hear
  eachother all the time.  And even then it probably won't work too well,
  because a radio path has distortions (due to multipath, changing propagation
  etc) that a telephone modem is not designed to cope with."

Agreed. However, I am thinking of using a stable, high quality but unidirectio
nal voice
(or wider) channel.

>
> Rob
> --
> +------------------------------------+--------------------------------------
+
> | Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob
|
> | AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU
|
> +------------------------------------+--------------------------------------
+

Thanks for your help.

--
Tom Holden VE3MEO


From [e-mail] Sat Oct 12 12:01:01 1996
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!gatech!csulb.edu!news.sgi.com!howland.erols.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Tom Swisher)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with Icom IC-22S service
Date: 9 Oct 1996 15:38:37 -0400
Organization: The Greater Columbus FreeNet
Lines: 34
Message-ID: <53guvt$[e-mail]>
NNTP-Posting-Host: login.freenet.columbus.oh.us
Keywords: Icom, IC-22S, service
X-Newsreader: TIN [version 1.2 PL2]

Hello all.

I just picked up an Icom IC-22S free from a friend. It does not work
correctly but the price was right. If I can get it working it would be and
ideal rig in the shack for communicating on a few specific
frequencies.

He did not have a manual with the radio, and I don't have a service manual
(nor do I know if they can still be obtained; the Icom tech support line
is swamped). Can anyone give me a few pointers as to common problems with
this particular radio?

Problems noticed so far:

1. No RF output that I can see, although the transmit light does light up.
2. Very little audio on receive and no squelch action.
3. Unknown if the diode matrix and it's associated circuitry are functioning.

I don't have any idea what frequencies are in the radio right now. I've
not had the time to go through and decipher the diode positions to figure
it out.

Please reply via e-mail to [e-mail] or post on the
group.

Thanks in advance for any assistance.

73,

Tom Swisher, N8GQK
--
Tom Swisher, N8GQK
The Ohio Railway Museum
"Save Our Roads.... Ship It By Rail"


From [e-mail] Sat Oct 12 12:01:02 1996
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!newspump.sol.net!news.mindspring.com!uunet!in1.uu.net!delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with Icom IC-22S service
Date: Fri, 11 Oct 96 00:22:20 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 16
Message-ID: <[e-mail]>
References: <53guvt$[e-mail]>
NNTP-Posting-Host: bos1d.delphi.com
X-To: Tom Swisher <[e-mail]>

Tom Swisher <[e-mail]> writes:

>I just picked up an Icom IC-22S free from a friend. It does not work
>correctly but the price was right. If I can get it working it would be and
>ideal rig in the shack for communicating on a few specific
>frequencies.

The most common problem with IC22S is the stainless steel
feedthrus on the PLL board. The second most common problem
is failure of the divide-by-N chip. Replace all the steel
feedthrus with copper wires soldering both sides since
the PCB is not plated-thru holes. Unfortunately, the
divide-by-N chip is out of production. If you can't fix
it, I would be interested in acquiring it from you.

73, Cecil, W6RCA, OOTC


From [e-mail] Sat Oct 12 12:01:02 1996
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!EU.net!uunet!news-in2.uu.net!nntp.teleport.com!ip-pdx18-14
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: HF Linear amp kit company?
Date: Fri, 11 Oct 96 17:45:48 GMT
Organization: EZNEC Antenna Software
Lines: 8
Message-ID: <53m12b$[e-mail]>
NNTP-Posting-Host: ip-pdx18-14.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

There's a company which sells kits for some of the HF linear amps described
in Motorola application notes. I've lost their name and address. Would
someone please be so kind as to send it to me? (I'd also like phone and fax
numbers if possible; the info is for someone out of the country.)

Thanks!

Roy Lewallen, W7EL


From [e-mail] Sat Oct 12 12:01:03 1996
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsfeed.internetmci.com!newsgate.compuserve.com!ix.netcom.com!news
From: Larry Keith <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF Linear amp kit company?
Date: Fri, 11 Oct 1996 16:24:52 +0000
Organization: Netcom
Lines: 26
Message-ID: <[e-mail]>
References: <53m12b$[e-mail]>
NNTP-Posting-Host: mac-ga3-06.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Fri Oct 11  1:22:10 PM PDT 1996
X-Mailer: Mozilla 3.0Gold (Win95; I)

Roy Lewallen wrote:
>
> There's a company which sells kits for some of the HF linear amps described
> in Motorola application notes. I've lost their name and address. Would
> someone please be so kind as to send it to me? (I'd also like phone and fax
> numbers if possible; the info is for someone out of the country.)
>
> Thanks!
>
> Roy Lewallen, W7EL


Hi Roy...

I think you are looking for:

        Communications Concepts, Inc.
        508 Millstone Drive
        Beavercreek, OH 45434-5840

        513-426-8600


73,

Larry, KQ4BY


From [e-mail] Sat Oct 12 12:01:04 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!munnari.OZ.AU!news.mel.connect.com.au!news.ade.connect.com.au!news.adelaide.on.net!highlander.senet.com.au!usenet
From: [e-mail] (chris)
Newsgroups: rec.radio.amateur.homebrew
Subject: HF power amplifiers
Date: Fri, 11 Oct 1996 10:59:58 GMT
Organization: SE Network Access Pty Ltd
Lines: 27
Message-ID: <53l9jr$[e-mail]>
NNTP-Posting-Host: dialup66.senet.com.au
X-Newsreader: Forte Free Agent 1.0.82

Hello all...

Can anyone help with a circuit for a HF power amplifier (the so called
"linear") that has 4 output transistors of the same type?

I'm not after detailed plans, or even a whole circuit - the "icing
on the cake" bits like TX/RX sensing, the power supply system,
the lowpass filter on the output stage, etc, etc, are not needed.

What I am after is the methods used to connect 4 output devices
of the *same* type (i.e. 4 x mrf454,  or even 4 x 2SC1969's) together
to achieve approx twice the output power that a pair of the same
devices would achieve.  I presume the "secret" is in the transformers
used in the driver and output stages....

The amp is intended for use in the 40 and 20 metre ham bands only,
to simplify the LPF stage more than anything else - SSB/CW only.

Any info would be very appriciated.

Reply here, or preferably email to: [e-mail]

Regards,
Chris.





From [e-mail] Sat Oct 12 12:01:05 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!cam-news-hub1.bbnplanet.com!nntp-hub2.barrnet.net!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
Subject: Re: im lookin to build a 0-12v regulated power supply ,,,need schematics
Date: 7 Oct 1996 21:13:14 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 41
Message-ID: <53brpa$[e-mail]>
References: <53537t$[e-mail]> <53b9mn$[e-mail]> <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com
Cc:

In article <[e-mail]>,
miker in Tigard, OR. <[e-mail]> wrote:
>Jim wrote:
>>
>> Use an LM317 or similar adjustable voltage regulator on any transformer
>> with a rectified no-load output less than 35 volts.
>>
>> You can find the schematic for this everywhere.
>>
>> There are also some higher current versions of the LM317 available
>> if 1.5 amps isn't enough.
>>
>> N6OTQOne of the problems is that a 317 won't go to 0 volts without a lot
>of help.  Power dissipation is a big problem at any reasonable current.
>miker

One way to build a power supply that combines the good transient
response and low noise of a linear regulator with the high efficiency
of a switching supply is to use a switching supply to regulate the
raw power supply down to about one or two volts higher than the
desired output voltage, then use a linear regulator at the desired
output voltage.

Though I haven't tried it, it shouldn't be too hard to make the
switcher track the linear supply, so you'd only need one voltage
adjustment.

Using a PNP pass element would allow a very small differential
on the linear supply (under 1V).

This isn't that hard of a project, though it isn't a single-chip
one-evening job.

Have a look at the Texas Instruments Linear Databook for some
excellent material on designing power supplies.

--
 * Dana H. Myers KK6JQ, 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] Sat Oct 12 12:01:06 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!news.sgi.com!news-out.microserve.net!news-in.microserve.net!news
From: [e-mail] (Steven Kerns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info on 900mhz hybrid amp module??
Date: 6 Oct 1996 14:57:56 GMT
Organization: Penn Biomedical Support, Inc.
Lines: 27
Distribution: world
Message-ID: <538hdk$[e-mail]>
References: <1996Oct3.193153.650@main03>
NNTP-Posting-Host: ppp14.talon.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Try Down East Microwave, I have one of their old catalogs and
they list that hybrid as a linear 903 Mhz 10mW in 10W out module.
Sorry I don't have their number but I am sure you could find it
in QST.

73  Steven Kerns N3FTI
[e-mail]
Penn Biomedical Support, Inc.
300 Ben Franklin Hwy E.
Douglssville, PA 19518
610-404-0100

In article <1996Oct3.193153.650@main03>, [e-mail] says...
>
>I recently purchased a 900mhz "stick-amp" which utilizes a PF0011 (Hitachi?)
>hybrid power module - supposedly good for 10W. I'd like to use this as a
903mhz
>linear amp for SSB/CW. Question: does anyone have a data sheet for this
device,
>or at least know whether it's suitable for class AB operation and what the
>supply voltage requirements are?
>Thanks!
>Joe - AA3GN
>--
>[e-mail] - speaking only for myself, of course
>No, this is not a sig.



From [e-mail] Sat Oct 12 12:01:07 1996
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!news.uoregon.edu!waikato!wolfman.xtra.co.nz![e-mail]
From: Paul Smith <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info on 900mhz hybrid amp module??
Date: Sun, 06 Oct 1996 16:01:10 +1300
Organization: Customer of Telecom Internet Services
Lines: 22
Message-ID: <[e-mail]>
References: <1996Oct3.193153.650@main03>
NNTP-Posting-Host: 202.27.178.96
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02E-XTRA  (Win95; I)
To: Joe Landis <[e-mail]>

Joe Landis wrote:
>
> I recently purchased a 900mhz "stick-amp" which utilizes a PF0011 (Hitachi?)
> hybrid power module - supposedly good for 10W. I'd like to use this as a 903
mhz
> linear amp for SSB/CW. Question: does anyone have a data sheet for this devi
ce,
> or at least know whether it's suitable for class AB operation and what the
> supply voltage requirements are?
> Thanks!
> Joe - AA3GN
> --
> [e-mail] - speaking only for myself, of course
> No, this is not a sig.

PF0011(ceramic) and PF0031(plastic) modules 10mw in 6-10 Watt out.

Will run class AB ie OK for SSB.  The unit will require 13.6 as the
supply voltage and there is a pin next to the input pin that you can use
to vary the gain of the device.  It will take 0 to 8 volts to vary the
gain according to my data sheet.   I am currently awaiting a module
myself for my DownEastMicrowave Transverter on 922 - 928Mhz.

DE Paul ZL2UGR


From [e-mail] Sat Oct 12 12:01:08 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!vixen.cso.uiuc.edu!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!netnews.nwnet.net!news.u.washington.edu!news.alt.net!news1.alt.net!news.aa.net!ratty.wolfe.net!usenet
From: Ramon Gandia <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: JAN Crystals- don't blame me
Date: Sun, 06 Oct 1996 23:05:03 -0800
Organization: Anvil Technology
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: nome-ts1-p01.nome.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; I)
To: [e-mail]

[e-mail] wrote:

>
> As a service to JAN Crystals, I am willing to take a compilation of
> responses in the newsgroup and fax them to JAN.  Its only fair to them.
> We need as many domestic electronic manufacturers now-a-days as possible,
> and its not really in the spirit of ham radio (20m SSB excepted) to
> criticise them without a chance for a response, since they are not on the
> net.

Let me see if I have this straight.  You are taking responses, sending
them to JAN so they can sue the underwear off the people that
made critical posts....

I have no experience with JAN crystals, but what you are doing is
not exactly fair to the folks that tried to help you out.

Ramon, AL7X   [ To foil SpamBots, my address is not machine readable.
Nome, Alaska  [ Send your e-mail replies to:   rfg.at.nome.dot.net


From [e-mail] Sat Oct 12 12:01:11 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!cam-news-hub1.bbnplanet.com!tezcat!news.sprintlink.net!news-chi-8.sprintlink.net!ratty.wolfe.net!ppp-dialup10.3rdplanet.com!user
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: JAN Crystals- don't blame me
Date: Mon, 07 Oct 1996 05:56:41 -0700
Organization: Wolfe Internet Access, L.L.C.
Lines: 29
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ppp-dialup10.3rdplanet.com

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

>
>Let me see if I have this straight.  You are taking responses, sending
>them to JAN so they can sue the underwear off the people that
>made critical posts....
>

Actually, found that Drake still sells 160M, 10M, and WARC crystals for
R4/T4 series for $15/pc.  I also understand that they do not have any
crystals for ranges outside the ham bands.

Like I said a month ago, sorry to ever bring up the subject of JAN on this
group. I was hoping to be the "good guy" after seeing several posts very
critical of JAN, and thought I'd get lots of positive posts if I asked for
others' opinions who ordered from them.

Then I could send in my order and add my "positive" two cents on this
group in response to the nay-sayers....  ...and everyone would live
happily-ever-after...    ...and the new sunspot cycle would miraculously
start next week, peaking on the CQWW weekends at an averaged number of
160...   ... with geomagnetic fields quiet....  and the FCC announcing
that all HF bands will be expanded by 100khz... with the code requirement
being abolished and the 30byte/min  ASCII copying requirement being added
in response to need for ops copying the new digital modes in times of
emergency per new FEMA guidelines...

in la la land,  73


From [e-mail] Sat Oct 12 12:01:12 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!gatech!csulb.edu!news.sgi.com!howland.erols.net!feed1.news.erols.com!arclight.uoregon.edu!newsfeed.direct.ca!nntp.portal.ca!van-bc!unixg.ubc.ca!aurora.cs.athabascau.ca!news.mag-net.com!ve7tcp.ampr.org!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Mark K Flanagan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Longwave Amateur Band
Date: 6 Oct 96 21:28:47 GMT
Organization: ucsd usenet gateway
Lines: 4
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I have heard of a band called LOWFER; as in low frequency.  All I know is
it is limited
power and limited antenna size.  Not sure about much more.  It is sort of
an enigma.


From [e-mail] Sat Oct 12 12:01:13 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!eskimo!news
From: [e-mail] (Bill Turner)
Subject: Re: Longwave Amateur Band
X-Nntp-Posting-Host: wrt.ndip.eskimo.net
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Content-Transfer-Encoding: 7bit
Organization: Eskimo North (206) For-Ever
X-Newsreader: Forte Agent .99f/16.299
References: <[e-mail]> <[e-mail]> <53dbcb$[e-mail]>
Mime-Version: 1.0
Date: Thu, 10 Oct 1996 23:34:19 GMT
Lines: 16

[e-mail] (AF4K) wrote:
<snip>
>In the US it is on 190 kHz
>
>Signals generally travel a distance of about 50 feet then disappear!
>
>But if you have nothing else to do, why not!
---------------------------------------------
I have never operated myself, but many people have worked several hundred
miles under ideal conditions.  I recall one fellow claimed 750 miles.  There
are a number of beacons operating more or less continuously.  Listen around
and if you hear any CW identifiers, email me.  I have a list and will look
them up.  Typically, they use their initials or the suffix of their ham calls.

73, Bill W7LZP
[e-mail]


From [e-mail] Sat Oct 12 12:01:14 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!dispatch.news.demon.net!demon!zetnet.co.uk!usenet
From: John Rabson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Amateur Band
Date: Thu, 10 Oct 1996 21:31:04 +0100
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <53dbcb$[e-mail]> <[e-mail]>
NNTP-Posting-Host: central.zetnet.co.uk
X-Mailer: ZIMACS Version 1.09x 10000842

The UK LF band is 73 kHz +/- 1.4kHz, with erp 1 W max. All modes
except FSTV. No /M or /MM! See
http://www.users.dircon.co.uk/~stonix/73kHz/ and some pages in
http://www.Sat.dundee.ac.uk/~arb/creg/

73 de John Rabson
G3PAI




From [e-mail] Sat Oct 12 12:01:15 1996
From: [e-mail] (Gary Randall)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for IC
Date: Sun, 06 Oct 1996 20:11:38 GMT
Reply-To: [e-mail]
X-Newsreader: Forte Free Agent 1.0.82
NNTP-Posting-Host: us1-83.water.net
Message-ID: <[e-mail]>
Lines: 12
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!newsfeed.internetmci.com!news.intercenter.net!us1-83.water.net

Hello and thanks for reading this msg.

I am looking for a MC4016 cound donw decade counter, I know
they are old, but I only require one.

Anyone knows where I can purchase one or has one please
let me know here or via email : [e-mail]

Thanks
Gary
KD4VRZ



From [e-mail] Sat Oct 12 12:01:16 1996
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!news.idt.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: LowFer Band Beacon near Boston
Date: 9 Oct 1996 22:04:52 GMT
Organization: IDT Corporation
Lines: 17
Message-ID: <53h7i4$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: hingham174.pcix.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Gudday fellow HomeBrewers..

Just revived my Old Lowfer Transmitter and it is on 186.700  khz.   +/- .5 hz.
.

I am 20 miles south of Boston on Coast with the ID on CW being '1A'
Soon will have the CCW and DSP Hooked up..
Can anyone around New England hear me ??
My grid is FN42pb

73 and Happy Listening..

If you are interested in LowFer schtuff try  'LWCA' on your search engine to g
et
the LOWDOWN and other related files..

de Dave AA1A  Marshfield, Mass.




From [e-mail] Sat Oct 12 12:01:16 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!dimensional.com!news.wizard.com !news.ici.net!news
From: Bruce KD1MW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: MICROWAVE DEVICE
Date: Thu, 10 Oct 1996 07:23:50 +0000
Organization: The Internet Connection
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: pmfr1ip14
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Macintosh; I; 68K)

Any interest in NARDA - coaxial phase shifter, 3.5 -12.4 MHZ? I have
one.  Make offer or otherwise.  Thanks, Bruce KD1MW


From [e-mail] Sat Oct 12 12:01:17 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!netnews.worldnet.att.net!newsadm
From: Arthur Garabedian <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NATIONAL 1-10 SUPER REGEN. REC.
Date: Sun, 06 Oct 1996 13:32:20 -0400
Organization: westernmobiletel
Lines: 3
Message-ID: <[e-mail]>
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I have 2 ea. National 1-10 receivers, one the large tunning dial
is on the right side and the other radio has it on the left side!
Does anyone have any information on them?  Thanks  ARTHUR . . . KC6KUK


From [e-mail] Sat Oct 12 12:01:18 1996
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!news1.iamerica.net!news
From: [e-mail] (dwh)
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED INFO ON GE PORTAMOBILE 49MHZ RADIO
Date: Thu, 10 Oct 1996 14:41:58 GMT
Organization: LDS I-America
Lines: 13
Message-ID: <53j2fk$[e-mail]>
NNTP-Posting-Host: 205.173.249.36
X-Newsreader: Forte Free Agent 1.0.82

Hello,
  We have a GE Portamobile Radio on 49Mhz.  Is anyone familar with
this radio?  All we have is the radio on 49.180 Mhz and the AC
powersupply that clips on to the bottom.  The radio does transmit 10
watts but we do not have a receive xtal.  The model # is HN44LA833
TX data ET61A and RX data is ER43A.  Any info would be appreciated.
Will the radio tune up on 6M?  Does anyone have realigning
instructions?  Copies of the service manual?

Thanks
AB5LG




From [e-mail] Sat Oct 12 12:01:19 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Nichrome wire
Date: Mon, 07 Oct 96 08:12:08 GMT
Organization: EZNEC Antenna Software
Lines: 15
Message-ID: <53aduo$[e-mail]>
References: <539n3i$[e-mail]>
NNTP-Posting-Host: ip-pdx02-09.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <539n3i$[e-mail]>,
   [e-mail] (Joe Schwob) wrote:
>I am rebuilding a very small high heat oven.  Does anyone know where I
>can get Nichrome wire to complete the job?
>
>Joe Schwob
>KB8TV
>
Try your local appliance dealer. He'll have replacement elements for
electric dryers, and probably other appliances that get hot. They're
relatively inexpensive. Or you could buy old or broken appliances (hair
dryers, popcorn poppers, irons, whatever) at the Goodwill store or garage
sales.

Roy Lewallen, W7EL


From [e-mail] Sat Oct 12 12:01:20 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!news.enteract.com!ix.netcom.com!news
From: Koert Koelman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Oct 12 Radio Auction San Mateo CA
Date: Thu, 10 Oct 1996 22:57:30 -0700
Organization: N/A
Lines: 27
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: smx-ca8-42.ix.netcom.com
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X-NETCOM-Date: Fri Oct 11 12:57:23 AM CDT 1996
X-Mailer: Mozilla 3.0 (Win95; I)

On October 12, 1996, the Palo Alto Amateur Radio Association
(PAARA) will hold its 45st annual auction and flea market at the
San Mateo Shriners Center, 1925 Elkhorn Court, San Mateo, CA.
Doors open at 7:30 A.M. and the auction will start around 9:30
A.M.

Ham radio gear, electronic parts and test equipment is likley to
change hands at bargain prices.  Raffle prizes will be offered
and coffee & donuts will be served.  All in all it will be a lot
of fun for those of you who have the post Foothill Flea Market
blues.

Flea market table space is available at $10 per table.  Auction
charges are 10% of the sales price (buy-back subject to $5/max.
charge per lot).  Equipment donations are welcomed by the club.
Proceeds benefit PAARA.

Directions to the Shriners' Center.  From HWY 101 or 280, take
the HWY 92 to the El Camino Real South exit.  On the El Camino
Real travel to 20th Avenue, where you'll turn right.  One block
and you'll see Elkhorn Court.  Talk-in frequency is 147.45
simplex.

Please, note the location this year ... it is in San Mateo.  See
you there.

Koert KC6WCI


From [e-mail] Sat Oct 12 12:01:21 1996
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!demos!news1.relcom.ru!EU.net!enews.sgi.com!arclight.uoregon.edu!super.zippo.com!zdc!zippo!drn
From: LD Brewer
Newsgroups: rec.radio.amateur.homebrew
Subject: Parts, Kits, builders supplies available.
Date: 10 Oct 1996 20:59:16 -0700
Organization: Zippo
Lines: 13
Message-ID: <53kgmk$[e-mail]>
NNTP-Posting-Host: 207.115.230.55


Radio hobbyists:

We have a large selection of parts, equipment, kits, supplies, test gear, and
etc.

Check out:

http://www.ldbrewer.com

Enjoy !

Doug
KC4HAZ


From [e-mail] Sat Oct 12 12:01:21 1996
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From: [e-mail] (AF4K)
Newsgroups: rec.radio.amateur.homebrew
Subject: PARTS???
Date: Mon, 07 Oct 1996 23:12:14 GMT
Organization: GLOWBUGS
Lines: 12
Distribution: inet
Message-ID: <53cd7k$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82

Say guys - doesn't anyone ever buy and sell parts through this Usenet group?


It would seem like a natural!

I am looking for variable capacitors in the 50 pF or 150 pF range.
Maybe could use a 200 or a 350 pF also.

I need FT-243 crystals for the 80 meter and 40 meter CW bands too.

Bry, AF4K



From [e-mail] Sat Oct 12 12:01:22 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate voltages
Date: 7 Oct 1996 04:54:22 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 55
Sender: [e-mail]
Message-ID: <53agfu$[e-mail]>
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In article <536gk8$[e-mail]>, gbostick@luna (Wish I knew) writes:

>In many of the HF amps for amateur radio there is a cw/ssb switch that
>changes the plate voltage from low on cw to high on ssb. I have read that

>this is to maintain efficiency at the different power inputs used. The
>high plate voltage makes sense, in that for a given power level a lower
>current would be required. To run at a lower voltage, thus requiring a
>higher current at a given power does not make sense. So, if you can run
>1000W input with 2500V @ 400MA, what is the reason for lowering the
>voltage to 1700V and then having to push 588MA ?  What is the criteria
for
>selecting the lower voltage value?
>
>This is an equal opportunity question open to all that would like to
share
>their answers, as I am a bit weak in the hi pwr linear amp design
>department.
>
>-gary

Hi Gary,

The reason for the high/low voltage was in the early days a PA could only
run 1kW dc plate INPUT on key down carrier CW (about 500-700 watts out
with normal PA's) , and 1 kW maximum indicated dc plate power input at
modulation crests on SSB (at least 2 kW PEP plate INPUT power on SSB, and
about 1200 watts or so PEP output).

If the high voltage was increased the correct amount for SSB the following
would happen:

1.) The user could tune the PA on CW, and flip the switch to SSB without
breaking the law by tuning at much higher power on carrier.

2.) The highest crest the PA meters would reach on SSB would be 1 kW on
SSB and  CW, both legal.

3.) The tube output impedance (and hence the tank control settings) would
remain the same because the ratio of RF anode voltage to RMS anode current
would remain the same.

This feature was slowly phased out of most amplifiers when the FCC changed
the power rules.

By the way, this is why so many people "blow up" SB-220's. The SB-220 was
designed to operate at 500-600 watts CW output, while dissipating about
400-500 watts in the tubes. The same with the L4B Drake.

It is also why most of the tuners sold today have exaggerated power
ratings. They were rated to match the power amplifiers years ago, when a 2
kW PA would really only run 500 or 600 watts output. Most 2 kW antenna
tuners really only handle 500-600 watts of CW carrier.

73 Tom


From [e-mail] Sat Oct 12 12:01:23 1996
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From: Robert Ganter <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Plate voltages
Date: Thu, 10 Oct 1996 09:33:35 +0200
Organization: Ascom Business Systems AG
Lines: 13
Message-ID: <[e-mail]>
References: <536gk8$[e-mail]> <537840$[e-mail]>
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[e-mail]@smtp-news2.ibm.net wrote:
>
>  maybe some local old timer may have the Eimac 'Care and Feeding of Power
>  Grid Tubes'. It does a great job of explaining the whole deal with load lin
es,
>  impedances, and all. They're not too tough to understand. Only the Gate 2
>  Vanity Call operation is beyond comprehension. Cheers!

Do they still sell this book (or booklet) ? I would be very interested.
If it is not available anymore, could someone photocopy it?

Regards

Robert HB9NBY


From [e-mail] Sat Oct 12 12:01:24 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!swrinde!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,rec.radio.amateur.equipment,sci.electronics.misc,sci.electronics.components
Subject: Re: Q. Unusual RF component in 100 watt 2 to 30MHz wideband linear
Date: 10 Oct 1996 17:05:37 GMT
Organization: Hewlett-Packard
Lines: 9
Message-ID: <53jad1$[e-mail]>
References: <53g96m$[e-mail]> <[e-mail]>
NNTP-Posting-Host: mentor23.scd.hp.com
Xref: news2.epix.net rec.radio.amateur.homebrew:20122 rec.radio.amateur.equipment:40552 sci.electronics.misc:15880 sci.electronics.components:13115

In article <[e-mail]>, Brian Kline  <[e-mail]> wrote:
>Winfield Hill wrote:
>I believe the part that you are referring to was called a Byristor by CTC
>(Communications Transistor Corp.) I think the CTC Part number was BY-1.

And Communications Transistor Corp. was purchased by Acrian,
hence the "ACR" designation.

Rick N6RK


From [e-mail] Sat Oct 12 12:01:25 1996
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From: Mark Fossum <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: S&S TAC-1 QRP Kit
Date: Sun, 06 Oct 1996 15:43:01 -0500
Organization: Netcom
Lines: 11
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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X-NETCOM-Date: Sun Oct 06  3:43:15 PM CDT 1996
X-Mailer: Mozilla 3.0 (Win95; I)

Hi!

Has anyone out there built one of of the TAC-1 QRP Kits from S&S
Engineering? I'm thinking about purchasing the kit and I'd like to hear
some input on the kit.

Thanks!!!


Mark Fossum  [e-mail]



From [e-mail] Sat Oct 12 12:01:26 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.inc.net!uwm.edu!news-peer.gsl.net!news.gsl.net!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!news3.agis.net!agis!NEWS!not-for-mail
From: Bob Lewis <[e-mail]>
Subject: Re: S&S TAC-1 QRP Kit
Message-ID: <[e-mail]>
Date: Thu, 10 Oct 1996 07:04:08 -0400
References: <[e-mail]> <[e-mail]> <[e-mail]>
Organization: AA4PB
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Mark Fossum wrote:
>
> Okay! Thanks for the information. The 40m version is exactly the one
> that I'm thinking about.
>
> Mark
>
> > Anyway, I highly recommend the S&S Engineering kits.
> >
> >         - They use only top quality parts.
> >         - The designs are excellent.
> >         - ON the air performance is top notch.  In half my contacts I am a
sked
> > about the rig and get compliments on the keying.
> >         - Building the kits is not simple but not difficult.  Be careful.
 Read
> > the directions, look at what you are doing, double check, work slowly.
> > These are full-featured radios and the circuit boards are packed.
> >
> >         Go for it.  You will not regret it.

I've built both the TAC-1 and ARK-4 kits for 40 meters. Both are
excellent. The ARK-4 is a little smaller and draws less current on
receive but uses thumb-wheel switches for tuning. If you are truly
backpacking then you might want to consider the ARK-4, otherwise the
TAC-1's knob tuning is easier to use.



From [e-mail] Sat Oct 12 12:01:27 1996
Path: news2.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!news.uoregon.edu!arclight.uoregon.edu!netnews.worldnet.att.net!newsadm
From: Doug Little <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: SEARS MANUAL
Date: Thu, 10 Oct 1996 20:31:10 -0700
Organization: AT&T WorldNet Services
Lines: 4
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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Many years ago, Sears sold a 2 meter radio. Am looking for service
manuals. Any ideas where to look?
Thanks
Doug


From [e-mail] Sat Oct 12 12:01:27 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Steve Ellington)
Subject: Re: SEARS MANUAL
X-Nntp-Posting-Host: iglou1
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Organization: IgLou Internet Services (1-800-436-4456)
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References: <[e-mail]>
Date: Fri, 11 Oct 1996 22:19:42 GMT
Lines: 11


: Many years ago, Sears sold a 2 meter radio. Am looking for service
: manuals. Any ideas where to look?

J.C. Penny's? When I worked at Sears 25 years ago, they had part number
breakouts on microfilm of virtually everything they sold including TV's
and radios. Get the model number xxx.xxxxx and give them a call. Perhaps
something is available.

--
Steve Ellington [e-mail]  Louisville, Ky


From [e-mail] Sat Oct 12 12:01:28 1996
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From: [e-mail] (Bryan Weaver)
Newsgroups: rec.radio.amateur.homebrew
Subject: Smart battery charging circuit???
Date: 9 Oct 1996 17:33:28 GMT
Organization: InfoRamp
Lines: 27
Message-ID: <53gnl8$[e-mail]>
NNTP-Posting-Host: ts29-04.tor.istar.ca
X-Newsreader: News Xpress Version 1.0 Beta #4

Hope this isn't a dumb question!

I'm interested in a circuit to control the charging of a lead acid (ie car)
battery. I use the battery as the power source for my packet station. It runs
the radio & tnc continuously. The average drain is fairly low 1 or 2 amps,
with peak load around 9A for transmit.

I have used a cheap car battery for this for a couple of years, but leaving
a trickle charger connected almost all the time ended up wrecking the battery.


I am looking for a circuit that would:
a) turn off the charger when the voltage accross the battery terminals exceeds

14.4V,
b) turn the charger back on at a preset voltage - say 12V,
c) and disconnect the battery from the load if the voltage drops below a
"fully discharged" voltage - around 11.4V

Has anyone any ideas on this?  Thanks & look forward to your replies - here or

via email.

Bryan
 -----------------------------------------------------------------------
Homepage: http://www.projectx.com/weaver/
email:    [e-mail]
AMPRNET:  [e-mail]
AX.25:    VE3TRJ@VE3INF.#SCON.ON.CAN.NOAM
 -----------------------------------------------------------------------


From [e-mail] Sat Oct 12 12:01:29 1996
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From: "Robert Morton" <[e-mail]>
Newsgroups: pl.rec.radio,pt.rec.radio.amadorismo,rec.ham-radio,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.space,rec.radio.broa
Subject: Software for Radio / DJ's
Date: 8 Oct 1996 00:11:04 GMT
Organization: Morton Software
Lines: 16
Message-ID: <01bbb4ac$eef181c0$[e-mail]8t>
NNTP-Posting-Host: pdhost23.cyberg8t.com
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PRESS RELEASE

Visit http://www.gosupersonic.com to download a fully functional trial
version of SuperSonic.
SuperSonic v2.01 is a very poweful and very inexpensive alternative to
expensive radio
hardware. It can be used to create attended and fully unattended complex
audio feeds.
Beta tested on Eagle Radio Networks, SuperSonic is a powerful tool for
radio broadcasters, internet audio broadcasters, and amateur/pro disc
jockeys.

Morton Software
http://www.gosupersonic.com




From [e-mail] Sat Oct 12 12:01:30 1996
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From: [e-mail] (William J. Wojnar, Jr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: subscribe
Date: 11 Oct 96 03:36:11 GMT
Organization: Willy's Toy
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

subscribe [e-mail]


From [e-mail] Sat Oct 12 12:01:31 1996
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From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: surplu component source(s) ???
Date: Sun, 06 Oct 1996 14:36:31 -0700
Organization: Aero Head Aviation
Lines: 8
Message-ID: <[e-mail]>
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Now that Dan's Small Parts is gone, anybody know of a source of parts
like MFE131 (40673 MOSFET sub.), NP0 caps, small air variable caps, etc.?
 Sure is making homebrew QRP items tough these days.  73, N0EDV.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 12 12:01:32 1996
Path: news2.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!homer.alpha.net!usenet
From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: surplu component source(s) ??? I BLEW IT!
Date: Sat, 12 Oct 1996 02:03:05 -0700
Organization: Aero Head Aviation
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
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scott wrote:
>
> Now that Dan's Small Parts is gone, anybody know of a source of parts
> like MFE131 (40673 MOSFET sub.), NP0 caps, small air variable caps, etc.?
>  Sure is making homebrew QRP items tough these days.  73, N0EDV.
>
> --
> Gotta FLY or gonna Die !
>     Ask me about my
>  Aeronca Super Chief !

I MADE A BIG MISTAKE....DAN'S SMALL PARTS IS NOT OUT OF BUSINESS...I HAD
HEARD THEY WERE AND DID NOT CONFIRM THE FACT...I COULDN'T FIND AN ADDRESS
OR TELEPHONE NUMBER SO I ASSUMED THE INFO I HAD WAS CORRECT.  I APOLOGIZE
TO DAN FOR THIS!  I'M HIS NUMBER ONE FAN AND GLAD HE'S STILL AROUND!  HE
HAS AN INTERNET CATALOG AT http://www.fix.net/dans.html.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 12 12:01:33 1996
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From: "J.Manuel Rivas Rodriguez" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: TWT Bandwidth
Date: Sun, 06 Oct 1996 16:16:38 +0200
Organization: EA1BLA
Lines: 7
Message-ID: <[e-mail]>
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Has anybody tried to use an TWT amplifier for 12 to 18 GHz in 10368 MHz.
I supose that 12 to 18 Ghz is the bandwidth specified for the
manufacturer for full specifications. I want to use one for 10 GHz. EME
and I have the oportunity to buy one.
Any previus experience.

Thanks EA1BLA.


From [e-mail] Sat Oct 12 12:01:34 1996
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From: "K.R.Burtchaell" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TWT Bandwidth
Date: 7 Oct 1996 11:42:00 GMT
Organization: KENTRON
Lines: 4
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References: <[e-mail]>
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To: [e-mail]

There are TWTs specified for 12-18Ghz that will work quite well at 10Ghz.
If you can't get info for a specific about a tube,you would probably have
to try it to know. 73 Ken W6GHV



From [e-mail] Sat Oct 12 12:01:35 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: vacuum variable tester
Date: Sun, 06 Oct 1996 23:00:19 -0700
Organization: Wolfe Internet Access, L.L.C.
Lines: 45
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp-dialup1.3rdplanet.com

Saw article nervously asking about vacuum variables someone bought at
flea-market.

Here, I have been very lucky in finding ones (like 2000pf @ 3kv and 500pf
@15kv at that non-descript "junk store" in Sacramento, Ca. in 1987.  Both
for $75 and now in my 8877 amp.
----------------

Those kinds of deals still exist, but you really need to be careful to buy
units that do not have the seals broken.

First indication of a good vacuum variable is the sight of perfect
unoxidized copper surfaces inside the device.  Sometimes its hard to see
the insides, due to wear, etc on the outside of the unit.  I've bought
some that looked as if they had dark brown copper metal on the inside,
only to find that it was some film on the glass making it look that way.

On the other hand, I have bought units that looked like perfect unoxidized
copper on the inside, only to find that the unit glowed purple when
installed in an amp.
-------------

>>>>  The only way you can be sure is to buy either from some well known
company, like Peter Dahl, or make yourself a simple high voltage AC source
from an old TV flyback transformer, that you can operate off 6 D batteries
in series, and take to the hamfests.  It might look silly, but you'll have
the last laugh when you get that incredible vac variable deal.
------------

There have been alot of articles about HV sources from TV flyback
transformers, but the simplest is to wind extra 10T and 1T windings on the
bottom of one, and then hook the 10T one between collector of 2N3055 and
12VDC supply, while connecting the 1T winding between GND and 1.0uf
polyprop cap to base of the 2N3055. A 1.0mh choke goes between junction of
1.0uF cap with base, to ground, and the emitter of 2N3055 is grounded.

With 12v applied, you should get 10-30kv or so.  In fact, may need to put
resistor in series with 2N3055 base, to limit HV!!.

You figure out how to put it into simple box for carrying around at
hamfests, or suprising your friends when they grab that doorknob....
just kidding, will usually resonate arount 30-40khz, which is way above
human electrocution frequency potential.

Good luck to you with some Tesla technology at your disposal!!!  Rob.


From [e-mail] Sat Oct 12 12:01:36 1996
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From: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: TRIAD HSM-79 Output Transformer x (1)
Date: 10 Oct 1996 21:26:05 GMT
Organization: The Internet Access Company, Inc.
Lines: 6
Message-ID: <53jpld$[e-mail]>
NNTP-Posting-Host: 206.119.240.234


If you have (1) of these xmrs for sale, please post to [e-mail].

Thanks,

Leif


From [e-mail] Sat Oct 12 12:01:37 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Rob Janssen)
Subject: Re: Z80-SIO & Z8530 Datasheet
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Thu, 10 Oct 1996 19:51:45 GMT
Lines: 14

In <[e-mail]> [e-mail]
(Joao Pissarro) writes:

>I need the Data Sheet for the IC's Z80-SIO and the Z8530. Does anyone
>knows on the net where I can find these information?

Ask your local Zilog/AMD representative for the databooks.
Datasheets won't bring you much, you will need the books to do anything
useful with them.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Sat Oct 12 12:01:38 1996
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From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Z80-SIO & Z8530 Datasheet
Date: 11 Oct 1996 20:56:09 GMT
Organization: American Information Systems, Inc.
Lines: 19
Message-ID: <53mc9b$[e-mail]>
References: <[e-mail]>
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In <[e-mail]>, [e-mail]
 (Joao Pissarro) writes:
>Hi all,
>
>I need the Data Sheet for the IC's Z80-SIO and the Z8530. Does anyone
>knows on the net where I can find these information?
>
>Many Thanks
>Joao Pissarro
>ct1dbh

try http://www.zilog.com

you should be able to download the datasheets in Adobe Acrobat .PDF
format.

Carl - wa6vse
[e-mail]




From [e-mail] Sat Oct 19 10:09:08 1996
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From: [e-mail] (William J. Skellenger)
Newsgroups: rec.radio.amateur.homebrew
Subject: 120VAC scanner from 12VDC
Date: 16 Oct 1996 00:34:20 -0400
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Howdy all:

I'd like to be able to run my home scanner this weekend at the SCCA PRO
Rally so that I can listen to what's going on with the race while I'm
marshalling.

I took this unit apart (Realistic PRO-2024) and measured the DC voltage
off of the rectifier on the board.  It was 13.5VDC, for all practical
purposes automotive 12V.  I installed a small coaxial power plug and
soldered it directly to either side of the rectifier on the board.
After plugging it in, I found that everything worked properly except for
that it *DIDN'T RECEIVE*.  I had my buddy verify this with his 2M right
next to me, and it didn't pick up a thing.  It's sitting in the house
plugged into an AC source again with no problem.

I've reached the end of my knowedge on this subject -- any suggestions?
Perhaps something ahead of the rectifier in the circuit isn't getting
energized?  No idea.

Thanks.

--Bill
Mechanical Engineering Undergraduate
Michigan Tech
Houghton, MI




From [e-mail] Sat Oct 19 10:09:09 1996
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From: [e-mail] (Paul C)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 120VAC scanner from 12VDC
Date: 19 Oct 1996 00:20:06 GMT
Organization: @Home Network
Lines: 42
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References: <541okc$[e-mail]>
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William J. Skellenger ([e-mail]) wrote:

: I took this unit apart (Realistic PRO-2024) and measured the DC voltage
: off of the rectifier on the board.  It was 13.5VDC, for all practical
: purposes automotive 12V.  I installed a small coaxial power plug and
: soldered it directly to either side of the rectifier on the board.
: After plugging it in, I found that everything worked properly except for
: that it *DIDN'T RECEIVE*.

Good thing that you didn't cook your transformer.  You were feeding
12VDC through the transformer secondary, which was basically a short
circuit.

My bet is that you were trying to check the scanner by running off of a
12V "wall wart" or other similarly current-limited device.  If you
measured the voltage across the added jack, you probably would have read
3.5V or so, which is the voltage drop across the rectifier diodes.  It's
possible that the "brains" are CMOS, with a 3-15V (or so) supply range,
so that's why the scanner appeared to work.

The receiver, OTOH, probably needs the whole 12V or so; otherwise, the
designer would have used a lower voltage.  The 3V simply wasn't enough.

If you can, try breaking the circuit through the secondary of the power
transformer.  If the xformer is not PCB mounted, you can probably
unsolder one of the secondary wires; connecting on the equipment side of
the rectifier is probably better in that you would not have the ~3V drop
through the rectifier.  Most coaxial jacks are set up for an "either/or"
supply, so that the xformer is connected without a plug; disconnected
with a plug.  This will give you a decent 12V-in connection.

Also.. be sure to fuse that lighter cord!

de N3EOP/6

--
         +----------------------------------------------------+
         | Technical Support Engineer, Cyclades Corporation   |
         | 800/88-CYCLADES (882-9252) or [phone], x258  |
         | Maker of High Performance Multiport Serial Cards   |
         | Unsolicited mail ads subject to a $25 handling fee |
         +----------------------------------------------------+


From [e-mail] Sat Oct 19 10:09:10 1996
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From: Bigdad <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 137 Mhz Preamps
Date: 15 Oct 1996 22:47:19 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
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Message-ID: <54149n$[e-mail]>
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Does anyone have or know where to get plans to build a low noise
preamp for use in the 137 MHz band (2 Meters should work) I
already have the Satellite Handbook, im looking for other options
here. Perhaps even a place that sells kits. Thanks




From [e-mail] Sat Oct 19 10:09:11 1996
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From: [e-mail] (Jeff Johnson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: 12 Oct 1996 01:09:50 GMT
Organization: Internet Interstate - Metropolitian Washington, DC -*- 301.652.IINT
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Distribution: world
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Allen Wallace ([e-mail]) wrote:
: In article <536pvq$[e-mail]> SteveBragg,
: [e-mail] writes:
: >Does anybody do homebrew amateur radar?  I know there's got to be a FEW of
: >us out there...
: >Reply if you're a "radar hack" like me.

: I'm intrested in this! I want to make a remote DF for 121.5 Mhz ELTs,
: using no moving parts, using monopulse DF. I also dabble in lots of
: microwave misc. I'd love to bounce several of my ideas off of a group of
: hams like you!

: Allen Wallace

Years ago I built a 10GHz doppler speed measuring device. (Radar
means "direction and ranging", so I am hesitant to call it Radar.)
It used a 2K25 reflex klystron and a magic "T" to a small horn
antenna.  The output fed an audio amp and a home-brew audio frequency
meter calibrated in MPH.  Right now I have some similar home
brew equipment, with dual horns, but I don't have any plans to
put it back on the air.


--
Andy Mitz   WA3LTJ
[e-mail]
Bethesda, MD


From [e-mail] Sat Oct 19 10:09:12 1996
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From: [e-mail] (Brian Bennett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: Sun, 13 Oct 1996 09:48:24 GMT
Organization: Not very  organized
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On Sun, 13 Oct 1996 09:10:11 GMT, [e-mail] (Brian Bennett)
wrote:
>A 555 is used as a pulse source (200 kHz-1 MHz), going to the
>varactor/V in of the gunnplexer and to the Horiz. trig. of a 'scope.
..Oops!! My mistake,  upon re-reading the article again, the horiz.
trig OUTPUT of the 'scope is used to trigger the 555 ( to output the
pulse to the varactor). But the other way would work I suppose, if you
could get the 555 just screamin' !?

Brian   VE7IJQ


From [e-mail] Sat Oct 19 10:09:13 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: Mon, 14 Oct 1996 10:33:15 -0400
Organization: gteais-org
Lines: 7
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References: <536pvq$[e-mail]>
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To: SteveBragg <[e-mail]>

I have seen a doppler kit in Radio Electronics (last 20 pages or so..)
operating on 2.3 GHz.  It displays MPH, KMH, and doppler shift.  Kit is
about $100, and you make the feed system (easy).

Take a look,

Al, NW2M


From [e-mail] Sat Oct 19 10:09:14 1996
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From: Tim Raffety <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: Tue, 15 Oct 1996 16:39:32 -0500
Organization: OxyChem
Lines: 23
Message-ID: <[e-mail]>
References: <536pvq$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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Brian Bennett wrote:
>
> On Thu, 10 Oct 1996 16:07:35 -0500, Jeff King <[e-mail]> wrote:
>
> >> > Does anybody do homebrew amateur radar?  I know there's got to be a FEW
 of
> >> > us out there...
>
> >In one of the Gunnplexer "CookBooks" there is a section about making a
> >Gunnplexer into a radar unit. I believe it chirps it as you suggest.
>
> In the Radio Amateur's Microwave Communications Handbook
> there is a small section on using a gunnplexer as a radar unit.
> A 555 is used as a pulse source (200 kHz-1 MHz), going to the
> varactor/V in of the gunnplexer and to the Horiz. trig. of a 'scope.
> The detector output from the gunnplexer is amplified ( variable gain
> 741?) and fed to the vert.  input of the scope. It states that the
> signal travels 1 mile in 5.1 uSec., so the distance to/ from the
> "objects" returning "blip" can be calculated.
> ( I've started on this project myself, I 'oughta be
> done,...uh,...whenever I stop starting other projects!)
>
> Regards,
> Brian  VE7IJQI would be very interested in reading how it went.  Please keep
 in touch.


From [e-mail] Sat Oct 19 10:09:15 1996
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From: Troy or Michelle Nicolls <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ANYONE BUILT SUPERCIRCUITS ATV XMITR???
Date: Wed, 16 Oct 1996 16:59:47 -0700
Organization: SnowCrest Net
Lines: 6
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Reply-To: [e-mail]
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Anyone out there ever built a supercircuits mm-1 ,439mhx ATV
transmitter?  I just built one and am having trouble. Seems that Q3 is
getting very hot, power output is very low and current drain is only
around 150 ma.  Maybe Q4 (power amp) is installed wrong or fried???  Any
help would be greatly appreciated as my electronics knowledge is very
limited.   Thanks in advance, Troy Nicolls.  KE6QMX


From [e-mail] Sat Oct 19 10:09:15 1996
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From: Bill Jones <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Are these worth anything?
Date: 15 Oct 1996 03:11:31 GMT
Organization: Tree of Life Studios
Lines: 23
Message-ID: <53uvd3$[e-mail]>
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I just rescued some old tube receivers from the trash heap and I'm
wondering if they're worth anything to anyone.

First, there's a Heathkit GR-91 receiver. Looks like it's in good shape,
but missing the main tuning capacitor.

Next, an unknown Philco 3 band AM receiver, BC, 1.5-6 Mc, and 6-18 Mc. It
uses #41 output tubes.

Third, a totally anonymous piece whose only identification is the word
"Mark VI A" stamped on the chassis with one of those rubber stamps that
uses black ink.

Anyone know if these things should go right back on the trash heap where
I found them?

Thanks,


Bill Jones
[e-mail]




From [e-mail] Sat Oct 19 10:09:16 1996
Newsgroups: rec.radio.amateur.homebrew,rec.antiques.radio+phono
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From: [e-mail] (Robert Casey)
Subject: Re: Are these worth anything?
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
References: <53uvd3$[e-mail]>
Date: Tue, 15 Oct 1996 05:03:32 GMT
Lines: 27
Sender: [e-mail]
Xref: news1.epix.net rec.radio.amateur.homebrew:20206 rec.antiques.radio+phono:29993

In article <53uvd3$[e-mail]> Bill Jones <[e-mail]>
writes:
>I just rescued some old tube receivers from the trash heap and I'm
>wondering if they're worth anything to anyone.
>
>First, there's a Heathkit GR-91 receiver. Looks like it's in good shape,
>but missing the main tuning capacitor.
>
>Next, an unknown Philco 3 band AM receiver, BC, 1.5-6 Mc, and 6-18 Mc. It
>uses #41 output tubes.
>
>Third, a totally anonymous piece whose only identification is the word
>"Mark VI A" stamped on the chassis with one of those rubber stamps that
>uses black ink.
>
>Anyone know if these things should go right back on the trash heap where
>I found them?
>
>Thanks,
>
>
>Bill Jones
>[e-mail]
>
I took the liberty to crosspost this into the antique radio newsgroup.
The Philco should be of interest to someone there at least.




From [e-mail] Sat Oct 19 10:09:17 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV gunn modulator ?
Date: 13 Oct 96 14:25:04 GMT
Organization: ucsd usenet gateway
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

73 and tnx for reading this message ..
i am looking for a simple ATV gunn diode modulator for 10ghz ...
anyone can help me  ????   tnx
 73  from mauro  [e-mail]    italy


From [e-mail] Sat Oct 19 10:09:18 1996
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From: [e-mail] (Marco puccini)
Newsgroups: rec.radio.amateur.homebrew
Subject: Bearcat 210
Date: 17 Oct 96 07:24:23 GMT
Organization: ucsd usenet gateway
Lines: 6
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Good Day to everybody, please I am looking for the schematic of the
scanner radio Bearcat 210
if somebody have's it please if he can send to me,I will pay for post
and eventul charge...
tnx for all.... Marco  ik3csv



From [e-mail] Sat Oct 19 10:09:19 1996
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From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: BELCOM LS202
Date: Mon, 14 Oct 1996 09:03:17 +0100
Organization: Rutherford Appleton Laboratory, Oxon, UK
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Paolo Petrini wrote:
>
> Anybody knows how to modify LS202 in order to have a better SSB
> Thanks
> Paolo IW1CCZ

Run it at very low power output.


From [e-mail] Sat Oct 19 10:09:21 1996
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From: [e-mail] (Frank Wuest)
Newsgroups: rec.radio.amateur.homebrew
Subject: British and French military radio equipment
Date: 16 Oct 1996 08:44:22 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 16
Message-ID: <542796$[e-mail]>
NNTP-Posting-Host: rpool19.rus.uni-stuttgart.de

Hello,
I am looking for any information on two pieces of radio equipment
I have, such as instruction / service manuals, schematics etc.

I have: Wireless Set No 19 Mk. III
and:    French transmitter BC 1306, probably from 1953
        the tx tube is a 2E22, I haven't been able to find any information
        on this one in any table so far ( only 2E24 and 2E26 )

I would appreciate any information on these units or sources of
parts or components. Please e-mail me directly in English or French
( my French isn't as good, but I think I can figure it out ).

Hoping that someone can help me,

Frank Wuest ( [e-mail])


From [e-mail] Sat Oct 19 10:09:22 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Rob Janssen)
Subject: Re: Car battery (13.8) to 12.0V DC regulaotor?
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <52r7si$[e-mail]> <5332e8$[e-mail]> <[e-mail]> <53b8dd$[e-mail]>
Date: Sat, 12 Oct 1996 12:08:24 GMT
Lines: 16

In <53b8dd$[e-mail]> [e-mail](Glenn Sparks)
writes:

>Are we making this a bit complex?  If the load is consistant .ie a
>specific application wouldn't a simple crowbar regulator
>with a 12 volt zener diode work?

Not very well, because it is operated with a small voltage differential
the voltage across the series resistor varies a lot.  Thus the current
trough the resistor varies a lot, and you end up using high-power resistors
and zener diodes and wasting a lot of power.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Sat Oct 19 10:09:23 1996
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From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB to 10 meters?  anybody ever do it?
Date: Tue, 15 Oct 1996 14:02:51 -0600
Organization: Los Alamos National Laboratory
Lines: 51
Message-ID: <[e-mail]>
References: <5409e9$[e-mail]>
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To: tyler <[e-mail]>

tyler wrote:
>
> Sorry to post here, it seems like the only place to post this sort of hting.
> Did anybody ever convert a CB to 10 meters?  Is it easily done?  (nothing is
> ever easily done, but is it easier than making Hillary Clinton a nice lady?)
> It is going to need retuned to go to those freqs, but you've also got to get
> rid of that 40 channel knob as far as tuning goes.  How do you tune the band
?
>  Any help would be greatly appreciated... 73s  Tyler N3SPDArticles on conver
ting CB's to 10 meters were common in the 1970's and
are most available in back issues of 73 magazine. I think 73 still sells
a compendium of that series of articles.  What killed off the enthusiasm
for cb-to-10 meter conversions was the FCC's type acceptance procedure
that has made it much more difficult (they cannot make it impossible) to
easily accomplish such a conversion.
Basic  conversion procedure for the following generic CB units:
-Old "crystal/mixer" radios, usually having 2 banks of crystals near the
channel selector, 4 in one row and 6 in another:
These usually require swapping of the 6 crystals to get 23 or 24
channels into the desired new band... not recommended due to the
crystal cost, plus the fact that the channel spacing will not come out
the way you normally would like for a ham rig.

-Early synthesized CB radios:  Depending on the rig you can either
change the reference crystal to one that will produce output in the 10
meter band or, again depending on the PLL chip involved, sometimes the
PLL chip can be re-programmed by un-grounding certain pins to allow
operation up into the 10 meter band with the original reference crystal
.  On these radios you can install an IC/ counter circuit that can set
or even scan your new channels, use the original 40 channel switch for a
very limited set of channels you'll have to use a chart to tell what
freq you're on, or learn to "count binary" and use a row of dip or
other small switches to directly program the synthesizer.

-Latest CB rigs usually are potted inside epoxy etc. to frustrate
"re-programming" of the PLL.  Some of these have "undocumented  jumpers"
that can be cut or switched to allow out-of-band operation, some can be
shorn of their protective epoxy or other coating, and some have to be
used "as is" as a driver for an external transverter to operate on the
desired new band.

RF alignment, both TX and RX, is usually minor with any of the above
CB's, as the CB is already rather close to the 10 meter ham band, many
will put out usable power (close to a watt or so) with no realignment at
all, but retuning of course almost always produces much more
satisfactory results.
--
|-------------------------------------------------------|
|Jim Devenport  WB5AOX                                  |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|http://nis-www.lanl.gov/~jdport/                       |
|-------------------------------------------------------|


From [e-mail] Sat Oct 19 10:09:24 1996
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From: [e-mail] (Tim Hynde)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB to 10 meters?  anybody ever do it?
Date: 16 Oct 1996 00:08:10 GMT
Organization: None
Lines: 22
Distribution: world
Message-ID: <54191a$[e-mail]>
References: <5409e9$[e-mail]>
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In article <5409e9$[e-mail]>, [e-mail] says...
>
>Sorry to post here, it seems like the only place to post this sort of
hting.

It's absolutly the right place to post.


>Did anybody ever convert a CB to 10 meters?  Is it easily done?

Some rigs are easily converted others next to impossible. My personal
experence has been that the much older flea market CB's (usually $5 or so)
are the easiest.

You need to understand crystal mixing, if it has banks of crystals. And some
require only one crystal to be changed. Unless you have a fair amount of
homebrewing experience a CB conversion may prove difficult. You'll be better
off if you find a couple old CB's and then post a request for that specific
board. They are all quite different in the conversion process.

GL, Tim ka8ddz



From [e-mail] Sat Oct 19 10:09:25 1996
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From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: CB to 10 meters?  anybody ever do it?
Date: 15 Oct 1996 15:08:57 GMT
Organization: Your Organization
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Sorry to post here, it seems like the only place to post this sort of hting.
Did anybody ever convert a CB to 10 meters?  Is it easily done?  (nothing is
ever easily done, but is it easier than making Hillary Clinton a nice lady?)
It is going to need retuned to go to those freqs, but you've also got to get
rid of that 40 channel knob as far as tuning goes.  How do you tune the band?
 Any help would be greatly appreciated... 73s  Tyler N3SPD



From [e-mail] Sat Oct 19 10:09:26 1996
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From: [e-mail] (Gary Hosler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB to 10 meters?  anybody ever do it?
Date: Wed, 16 Oct 1996 13:56:02 GMT
Organization: 3M - St. Paul, MN  55144-1000 US
Lines: 31
Message-ID: <542ps1$[e-mail]>
References: <5409e9$[e-mail]>
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[e-mail] (tyler) wrote:

>Sorry to post here, it seems like the only place to post this sort of hting.

>Did anybody ever convert a CB to 10 meters?  Is it easily done?  (nothing is
>ever easily done, but is it easier than making Hillary Clinton a nice lady?)

>It is going to need retuned to go to those freqs, but you've also got to get
>rid of that 40 channel knob as far as tuning goes.  How do you tune the band?

> Any help would be greatly appreciated... 73s  Tyler N3SPD

The degree of difficulty depends on the rig.  If you want to convert
one of the old rigs to 10M AM or FM it is fairly easy.  I have
converted a number of them to 10M FM and added a repeator offset
switch.  They work pretty well.  I have also converted an old Sears
Road Talker 40 (SSB rig) to 10M.  A bit more involved but nothing very
difficult.  Not knowing what rig you want to convert, or if it will be
a FM or SSB conversion I am unable to provide much further info.  In
most cases you need to change one crystal and peak up the transmitter
and receiver coils.  In most cases you don't need to get rid of the 40
channel knob.  There is a wealth of conversion information available.
In particular there was a complete series in 73 Magazine back in the
80's that covered conversions to CW, SSB, FM, AM, for use with
transverters, bandswitch modifications, adding scanner capabilities,
etc..  The converstions can be a lot of fun after the band returns.
We should see usable 10M conditions in the next 18 to 24 months.
During the last cycle I worked 78 countries using a converted "Chicken
Bander" in one winter without a lot of effort.  I would suggest a trip
to the local library.  Bob Heil (K9EID) also had a publication that
delt with CB to 10M FM converstions.

GL & CUL  de KN0Z  Gary

Opinions expressed herein are my own and may not represent those of my employe
r.


From [e-mail] Sat Oct 19 10:09:27 1996
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From: [e-mail] (Marcus Ramos)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: CB to 10 meters? anybody ever do it?
Date: 18 Oct 96 00:32:03 GMT
Organization: ucsd usenet gateway
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

In article <5409e9$[e-mail]>, [e-mail] says...

>Did anybody ever convert a CB to 10 meters?  Is it easily done?

Well sir, I use a rig called Cobra 3900 that gave me USB/LSB/AM/NBFM and
CW, that uses
a Motorola IC in the PLL ckt (MC145106 I gess). So, was more or less easy
to set it's
range to 28...29.7MHz. Some re-tune at the receiver front-end, transmition
driver/PA and
noise blanker circuits was needed. Today this is my 28MHz IF to an Yaesu
FTV107 trans
verter on 6 and 2 meter and with a DEM 28 to 144MHz IF adaptor, 2 extra
ports on 2 me -
ter to drive/receive on 1296, 2304 and 10GHz. But sorry, the
scehmactics/procedures
are on my head(a weekend job). Other rig I play was a Midland (I missed the
model) but
this one I modified to 6 meter, from 50.0 to 51.0 MHz. It's not so hard.
Best regards.

Marcus Ramos, PY3CRX
([e-mail])
([e-mail])
Homebrewing from 170KHz to 10.5GHz, GOES, METEOSAT, APT, SSTV, ATV.......


From [e-mail] Sat Oct 19 10:09:28 1996
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From: Scott Smith <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateurm.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: Cellular Motorola /CarKit for old large Handhleld cellphone FOR SALE
Date: Wed, 09 Oct 1996 07:37:14 -0400
Organization: Smitty's Services, Inc.
Lines: 5
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For the original Motorola hand held cellphones. Probably could be converted to
 newer models.
New in the box never used. All packing/accesories/etc. Mounts handleld in car.
Was $500 when new. I'll accept any reasonable/best offer. How about $100???
N2CQQ Scott
[e-mail]


From [e-mail] Sat Oct 19 10:09:29 1996
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From: eddie jones <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Circuit  design and etching
Date: Wed, 16 Oct 1996 08:07:43 -0200
Organization: Exis Net Inc
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Looking for information on computer programs for circuit design and any
books or other literature on "How to etch circuit boards".

Eddie KE4NBP
[e-mail]


From [e-mail] Sat Oct 19 10:09:31 1996
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From: [e-mail] (Adrian Bartel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Circuit  design and etching
Date: Fri, 18 Oct 1996 07:15:34 GMT
Organization: The South African Internet Exchange.
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eddie jones <[e-mail]> wrote:

>Looking for information on computer programs for circuit design and any
>books or other literature on "How to etch circuit boards".

There are some useful pointers in the FAQ at:
http://www.qucis.queensu.ca/home/pham/homebuilt/achh.faq.html

Cheers
Adrian



--------------------------------------------------------------
  "It does not do to leave a live dragon
   out of your calculations."      -- Tolkien
--------------------------------------------------------------



From [e-mail] Sat Oct 19 10:09:32 1996
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From: [e-mail] (Larry Rice)
Newsgroups: rec.radio.amateur.homebrew
Subject: Component substitution
Date: Thu, 17 Oct 1996 00:05:30 GMT
Organization: Omen Computer Services, Perth, Western Australia
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I wish to tackle the tx interface for the Super Morse programme
and am in need of a substitute for the following which is unknown
in VK-land.

RadioShack  TIL-113

I appreciate your assistance. Thanks

Larry VK6CP



From [e-mail] Sat Oct 19 10:09:33 1996
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From: [e-mail] (Jari Jokiniemi)
Newsgroups: es.rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: CQ USUARIOS ICOM  706
Date: 15 Oct 1996 12:53:07 GMT
Lines: 33
Message-ID: <[e-mail]>
References: <53vs4e$[e-mail]>
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In-reply-to: [e-mail]'s message of Tue, 15 Oct 1996 11:20:36 GMT
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In article <53vs4e$[e-mail]> [e-mail] (Jorge) writes:
   Desearia ponerme en contacto con otras estaciones que tengan el equipo
   ICOM 706 para intercambiar impresiones.
   Me gustarφa que me resolvierais algunas dudas, como la potencia que
   realmente os sale en SSB HF, si el VOX funciona correctamente con
   otros micr≤fonos, quΘ micr≤fonos usais ademßs del original de mano,
   decidme si el altavoz interior os vibra o distorsiona un poco cuando
   se sube el volumen, etc. Cualquier comentario al respecto o cualquier
   impresion sobre el IC-706 es bienvenida. Tambien mejoras y
   modificaciones, asφ como experiencias en m≤vil, etc.
   Espero vuestras respuestas, yo estoy a la espera de un software para
   controlar el IC-706 desde un PC, ya os dirΘ algo al respecto. Espero
   noticias.
   Francisco Garcφa  Apartado Correos 123   46080 Valencia

Hola Francisco. Yo no tengo el ICOM 706 pero he hecho un poco de contactos
con uno que mi amigo OH2BYS tiene. El 706 tiene buenas cosas y tambien
malas cosas.

Potencia de salida es sin duda 100 watios si la antenna no tiene
problemas. El 706 es muy pequeno, eso me gusta mucho. Es muy agradable
tener todas las bandas de 1.6 a 30 Mhz y 50 y 144 Mhz en una
radio. Las problemas que tiene estan: 1) los filtros de BLU estan muy
malos, 2) el equipo es un poco dificil de usar, por que tienes que
hacer que quieres "using menus" (perdon, mi castellano no es tan
bueno), 3) si hay grandisimas signales la radio tiene unos problemas.
Creo que el 706 no es para trabajar DX y concursos, pero es ok para
movil y contactos normales. En mi opinion el ICOM 706 es mejor que el
Kenwood TS 50.
--
Jari Jokiniemi, [e-mail], OH2MPO, OH3BU
Tekla Oy, Koronakatu 1, 02210 Espoo, 90-8879 474


From [e-mail] Sat Oct 19 10:09:34 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!inet-prime.comshare.com!news.izzy.net!news
From: [e-mail] (Tim Hynde)
Newsgroups: es.rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: CQ USUARIOS ICOM  706
Date: 16 Oct 1996 12:47:47 GMT
Organization: None
Lines: 34
Message-ID: <542lhj$[e-mail]>
References: <53vs4e$[e-mail]>
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Mime-Version: 1.0
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In article <53vs4e$[e-mail]>, [e-mail] says...
>
>
>Hola estimados amigos y colegas:
>
>Desearia ponerme en contacto con otras estaciones que tengan el equipo
>ICOM 706 para intercambiar impresiones.

Yo tengo varios amigos quien es usan este ICOM-706 y todos estan felizes con
este radio. Por el precio del radio no hay otro con todo lo que tiene.
Cuando yo hable con mis amigos la proxima vez yo les voy a preguntar de la
optiones por otro microfono.

Si yo qiero comprar un radio comercial yo compraria este modela 706, pero
para mi, homebrew es la unica forma HI HI.

Buena suerte, Tim

--Courtesy translation--

>I am looking for other stations using the ICOM 706 to exchange impressions
of the radio.


I have varios friends who are using the ICOM-706 and all of them are happy
with the radio, For the price no other radio has what this one has. When I
talk to my friends the next time I will ask them about the options for
another microphone.

If I wanted to buy a commercial radio I would buy the model 706, but for me
homebrew is the only way. HI HI

Good Luck, Tim



From [e-mail] Sat Oct 19 10:09:35 1996
From: [e-mail] (KT4IJ)
Newsgroups: rec.radio.amateur.homebrew
Subject: Custom COLOR PHOTO QSL cards for $ .30 each!!!!!!!!
Date: Thu, 17 Oct 1996 11:35:06 GMT
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Message-ID: <[e-mail]>
Lines: 15
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Hello all Richard KT4IJ here. I am going to try the qsl industry a
bit. I can make and sale custom designed QSL cards for about
30 cents a piece.. They will be printed on photographic paper
<heavy stock> and can have graphics like your call and the
QSL info put on there along with a picture of you in your shack
or your tower or whatever photo you would like to see on the
front of your QSL!! Custom designs avaible. You can even recieve
your proof via e-mail and make sure it is what YOU want before
they are printed!!! Sound good? E-mail [e-mail]
for the info......coming soon a web page with examples to browse
thru'!! Thanks for your intrest....

                                73 frm...Richard KT4IJ




From [e-mail] Sat Oct 19 10:09:36 1996
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From: gbostick@luna (Wish I knew)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Drake manuals FS
Date: 19 Oct 1996 06:03:24 GMT
Organization: University of South Florida
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K9SQG ([e-mail]) wrote:
: Have excellent copies of service manual for TR-7 plus owner's manuals for
: TR-7, RV-75, CW-75, P-75, L-7, PS-7, SP-75.  All shipped priority mail for
: $20.

: [e-mail]


From [e-mail] Sat Oct 19 10:09:37 1996
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From: [e-mail] (Tim Hynde)
Newsgroups: rec.radio.amateur.homebrew
Subject: Dual band for DC Reciever
Date: 14 Oct 1996 00:47:21 GMT
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Im a bit new at this but after getting my W1FB Universal DC RX going
I began to wonder if I couldn't add a selector switch and switch in
different torroids and caps for two or more bands.

I realize this could cause a bit more instability but if leads are kept
short etc. is this a resonable idea or is it not worth the effort?

Tim ka8ddz



From [e-mail] Sat Oct 19 10:09:38 1996
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From: Bill VanRemmen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: Fri, 11 Oct 1996 21:20:52 -0400
Organization: Frontier Internet
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Gary Tait wrote:
>
>
> The thin cable is 10 BASE-T ,not 10-BASE-5 (Thicknet),although I don't
> know of it's suitability for VHF radio work eiither.
>

10base-T is unshielded twisted pair.
10base2 is thinnet (RG-58 or similar w/BNC)
10base5 is thick ethernet (kinda like RG-8 w/ N-type terminations and 'taps'
that are installed through the side of the cable)
--

                                        -Bill VanRemmen, KA2WFJ
                                         [e-mail]
                                         http://www.frontiernet.net/~billy/

      My opinions.  No one in their right mind would claim otherwise.
============================================================================
   "Experience should teach us to be most on our guard to protect liberty
    when the government's purposes are beneficient  . . .  the greatest
    dangers to liberty lurk in insidious encroachment by men of zeal, well
    meaning but without understanding."
                                        Justice Louis Brandeis
                                        Olmstead vs. United States,
                                        United States Supreme Court, 1928
============================================================================


From [e-mail] Sat Oct 19 10:09:39 1996
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From: [e-mail] (Occolowitz John)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: Sun, 13 Oct 1996 00:42:57 GMT
Organization: IndyNet - Indys Internet Gateway ([e-mail])
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[e-mail] (Tom Watson) wrote:

>We all know that the data rate on "standard" ethernet is 10Mhz, and with
>modulation of the data, the highest frequency used is 20Mhz.  Given the
>fact that I have a spool of a few feet of nice 10-BASE-5 ethernet coax
>(yellow double shielded stuff) a few questions:

>1)  How good is it for VHF services (2 Meters??)
>2)  Loss figures??
>3)  Has anyone used it for this??

>Any other comments...

>Thanks

>de WA6HCW

>--
>Tom Watson
>[e-mail]         (Home: [e-mail])

I recently obtained some Montrose 5713 50 ohm ethernet cable and am
trying to get mnfr's. specs. but I've found the following by
measurement.
1) An open 41 ft. length gives approx. SWR of 9 to 1 at 144 Mhz. This
calculates to a loss of about 2.3 dB/100 ft.
2) The velocity factor is close to 80% and the dielectric is foamed,
because the temperature rating is 125 C I believe that the dielectric
is foamed teflon.
3)The cable is well shielded with both foil and braid.
As best I can tell this cable should be quite useful at 144 MHz. I
intend to use it for baluns for some 2M yagis.
Would appreciate receiving manufacturer's specs.

John KB9MIE.





From [e-mail] Sat Oct 19 10:09:40 1996
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From: "Peter Gottlieb" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: 11 Oct 1996 04:05:02 GMT
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> > fact that I have a spool of a few feet of nice 10-BASE-5 ethernet coax
> > (yellow double shielded stuff) a few questions:
> >
>
> If this is what is commonly known as "thinnet" coax for ethernet, it is
> RG-58.  Very lossy at 2M.
>

No, that would be 10-BASE-2.  He has the heavy duty thick stuff that
they bolt the transeivers to.

I don't have my catalogs hadny, but I have heard of hams using this
stuff with some success.  I don't recall any numbers on loss but I think
the stuff was around 50 Ohms.



From [e-mail] Sat Oct 19 10:09:41 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Ethernet Coax for ham use
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]> <01bbb729$7b7dba40$d6122399@peter-s> <541pkr$[e-mail]>
Date: Wed, 16 Oct 1996 17:25:49 GMT
Lines: 20

In article <541pkr$[e-mail]> [e-mail] (Tony White
) writes:
>>I don't have my catalogs hadny, but I have heard of hams using this
>>stuff with some success.  I don't recall any numbers on loss but I think
>>the stuff was around 50 Ohms.
>
>It is exactly 50 ohms.  I use it for VHF/UHF receivers, but I wouldn't dare
>transmit on it -- at least with over 25w power.  I'd use RG/8-U instead.

Why not transmit on it? If it hasn't had vampire taps punched into
it, it's as good as RG-8 for transmitting, and better shielded too.
I'm real leery of any of it which *has* had vampire taps punched into
it, though. If they aren't potential arc paths, they have at least
destroyed any weatherproofing the cable may have had.

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 Oct 19 10:09:42 1996
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From: [e-mail] (Tony White)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: 17 Oct 1996 00:06:52 GMT
Organization: Digitrix Microsystems
Lines: 16
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>>>I don't have my catalogs hadny, but I have heard of hams using this
>>>stuff with some success.  I don't recall any numbers on loss but I think
>>>the stuff was around 50 Ohms.
>>
>>It is exactly 50 ohms.  I use it for VHF/UHF receivers, but I wouldn't dare
>>transmit on it -- at least with over 25w power.  I'd use RG/8-U instead.
>
>Why not transmit on it? If it hasn't had vampire taps punched into
>it, it's as good as RG-8 for transmitting, and better shielded too.
>I'm real leery of any of it which *has* had vampire taps punched into
>it, though. If they aren't potential arc paths, they have at least
>destroyed any weatherproofing the cable may have had.

You're kidding -- /58 better than /8?  Well, I guess I'll have to try it,
then.  If I melt my finals, I'm coming after you... :-)



From [e-mail] Sat Oct 19 10:09:43 1996
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From: [e-mail] (Greg Banks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: Thu, 17 Oct 96 19:49:13 GMT
Organization: Taranaki Polytechnic
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In article <53p6ga$[e-mail]>,
   [e-mail] (Occolowitz John) wrote:
>[e-mail] (Tom Watson) wrote:
>
>>We all know that the data rate on "standard" ethernet is 10Mhz, and with
>>modulation of the data, the highest frequency used is 20Mhz.  Given the
>>fact that I have a spool of a few feet of nice 10-BASE-5 ethernet coax
>>(yellow double shielded stuff) a few questions:
>
>>1)  How good is it for VHF services (2 Meters??)
>>2)  Loss figures??
>>3)  Has anyone used it for this??
>

Looking at the Belden catalogue - - their type 9880 yellow jacketed 10 base 5
coax has the following spec:
Imp 50 ohms, Vel Factor 78%, loss per 100 feet - 0.52 dB @ 10Mhz, 1.2 dB @ 50
Mhz. Sorry thats the highest frequency they list - but this is close enough to

RG8 type figures to assume that performance will be similar. I wonder how well

the yellow PVC jacket survives in the sunlight?

-Greg ZL2BZH


From [e-mail] Sat Oct 19 10:09:46 1996
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From: "Robert R. Koblish" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: Wed, 16 Oct 1996 23:43:35 -0700
Organization: Erol's Internet Services
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Tony White wrote:
>
> >>>I don't have my catalogs hadny, but I have heard of hams using this
> >>>stuff with some success.  I don't recall any numbers on loss but I think
> >>>the stuff was around 50 Ohms.
> >>
> >>It is exactly 50 ohms.  I use it for VHF/UHF receivers, but I wouldn't dar
e
> >>transmit on it -- at least with over 25w power.  I'd use RG/8-U instead.
> >
> >Why not transmit on it? If it hasn't had vampire taps punched into
> >it, it's as good as RG-8 for transmitting, and better shielded too.
> >I'm real leery of any of it which *has* had vampire taps punched into
> >it, though. If they aren't potential arc paths, they have at least
> >destroyed any weatherproofing the cable may have had.
>
> You're kidding -- /58 better than /8?  Well, I guess I'll have to try it,
> then.  If I melt my finals, I'm coming after you... :-)

----------
You guys are confusing Thinnet (RG58/U) cable with Thicknet (RG8/U) type.
 I agree with Gary, I would not bother with Thicknet cable that's had
vampire taps.  But if you find a length that's been used point-to-point,
fine.  It might even have N connectors installed already!

Good luck.
Bob Koblish
N3HAT


From [e-mail] Sat Oct 19 10:09:48 1996
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From: burt lang <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: Wed, 16 Oct 1996 17:22:00 +0000
Organization: ve2bmq
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David Sipe wrote:
>
> Tom Watson wrote:
> >
> > We all know that the data rate on "standard" ethernet is 10Mhz, and with
> > modulation of the data, the highest frequency used is 20Mhz.  Given the
> > fact that I have a spool of a few feet of nice 10-BASE-5 ethernet coax
> > (yellow double shielded stuff) a few questions:
> >
> > 1)  How good is it for VHF services (2 Meters??)
> > 2)  Loss figures??
> > 3)  Has anyone used it for this??
>
> If this is what is commonly known as "thinnet" coax for ethernet, it is
> RG-58.  Very lossy at 2M.
>
> --
> 73  David   KD6QFZ
> [e-mail]


10base5 is thicknet I think.  If the cable is approximately the size of
RG-213 (RG-8) it is very good for VHF/UHF work.  The losses are only
slightly worse than Beldon 9913, it has 4 shields (2 braid/2 foil) and
regular type N connectors will fit.  The Yellow grade has a vinyl jacket
and there is an orangey-brown grade that is fluorocarbon based (teflon
FEP) and is fire resistant.  Both are very cheap on the surplus market
(I have bought up to 300 ft rolls for 10c/ft).  Warning if the cable is
used , look out for punctures where the Ethernet Taps were applied.
Carefully examine by feel every foot of the cable. They are very hard to
spot and when found should be taped carefully.

I did loss tests on this material a couple of years ago as a service to
a east coast surplus store.  The results are as follows (actual tests on
a sample of cable):

Yellow PVC cable
loss/100ft = 1.7 dB @ 146 MHz, 2.3 dB @ 223, 3.4 dB @ 440
velocity factor = 0.79
Impedance = 50.5 +/- 0.5 ohms  This is the actual variation noted within
the length being tested with a TDR.
length/lb = 8.6 ft  (useful to estimate the length of a roll)

Orange tint FEP cable
Loss/100ft = 2.0dB @ 146, 2.6dB @ 223, 3.7dB @ 440
velocity factor = 0.77
Impedance = 51.5 +/- 0.5 ohms
Length/lb = 7.8 ft/lb

For comparison purposes the following data was taken from mfgrs data
sheets

Beldon 9913  Needs special Type N Connector.
Loss/100 ft = 1.6 dB @ 146, 1.9 dB @ 223, 2.8 dB @ 440
Velocity factor = 0.84

Beldon 9914  (stranded center cond. I think) Needs special Type N conn.
Loss/100ft = 2.0 @ 146, 2.6 @ 223, 3.7 @ 440
Velocity factor = 0.78

RG-213
Loss/100ft = 2.7 @ 146, 3.5 @ 223, 5.0 @ 440
Velocity Factor = 0.66


I hope that this information will be useful to those who find this cable
and would like to put it to use.  I have been using several pieces of it
for some time outside without any problems although it is not rated for
exterior service and I have been warned by some folks that the jacket
will fail.  At the above mentioned surplus price I can replace it many
times for the price of black stuff.


Burt,  VE2BMQ



From [e-mail] Sat Oct 19 10:09:49 1996
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From: [e-mail] (Bayard Coolidge USG ZKO3-3/S20)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ethernet Coax for ham use
Date: 17 Oct 1996 17:10:22 GMT
Organization: Digital Equipment Corporation
Lines: 35
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--

It's amazing how questions about Ethernet coax seem to surface about
every year or so, and I keep forgetting my loss chart at home. (sigh).

Suffice it to say, I was on the original design team, and the guy who
actually did the design work on the coax is a ham. Yes, the thickwire
Ethernet coax is 50.0 ohms, its loss characteristics and power handling
capabilities are on a par, or better than RG-8/U, at least in the HF
region and low VHF region. We didn't do extensive loss testing at VHF
or above (no one in the group, including the manager, who is also a ham)
had any VHF gear to bring in to work to try it :-). I have heard some
anecdotal comments from network engineers from other companies that its
performance at VHF and above is disappointing, and that appears to be
due to the aluminum foil shield being the closest to the center conductor.
Although the "shield" is four shields in one (foil-braid-foil-braid,
looking from the inside going out), and provides fantastic protection
against inward or outward signal leakage, it's kind of lousy with respect
to skin effect at VHF.

So, you could probably run a kW through it on HF, and use it for phasing
lines and other special things at VHF.

BTW, this applies to both the yellow PVC stuff and the translucent orange
Teflon stuff, as well as the ugly purple "CI" cables with the TNC's on them.

------------------------------------------------------------------------------
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 Oct 19 10:09:50 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Tom R. Rice)
Subject: Re: Ethernet Coax for ham use
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]> <53p6ga$[e-mail]> <5443td$[e-mail]>
Date: Fri, 18 Oct 1996 16:10:35 GMT
Lines: 14
Sender: [e-mail]

[e-mail] (Greg Banks) writes:
>RG8 type figures to assume that performance will be similar. I wonder how wel
l
>the yellow PVC jacket survives in the sunlight?

        Well, check back in a year or two, as I have just
        installed 100 meters of this stuff over the ground
        up to my remote anyenna site.  We shall see.....

        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] Sat Oct 19 10:09:51 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (David Feldman)
Subject: Found - round & square chassis punches
Message-ID: <[e-mail]>
Organization: Organization? Me?
Distribution: usa
Date: Fri, 18 Oct 1996 17:19:12 GMT
Lines: 23
Sender: [e-mail]

After a bit of research (with help from internet friends) I located a source
for round and (1 size) square chassis punches. They are made by Q-MAX in
the UK, and sold by FARNELL.

Next step was to find FARNELL. Turns out FARNELL and Newark are in some kind
of venture/acquisition/merger/whatever. Anyway, I called my LOCAL Newark
distributor (denver) and after a bit of convincing the rep found the
FARNELL catalog and identified the punches to me.

They arrived (from stock, a couple of days later).

The sizes I purchased are round 3/8, 1/2, 9/16, 5/8, 3/4, 7/8 and 1" dia.,
and square 1"x1". The round punches were all in the $7-8 range, and the
square punch was $36. The interesting thing is that GREENLEE still sells
square punches but they are in the $100 each range. It appears that
Q-MAX only makes a 1" square punch (maybe they'll add other sizes later?).
There are many other round sizes, but only the one square size (too bad...)

The punches seem to be well made but I haven't tried to destroy one yet
so I can't say what quality metal is used.

73 Dave WB0GAZ [e-mail]



From [e-mail] Sat Oct 19 10:09:52 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Michael L. Ardai)
Subject: Re: Fox hunt Transmitter Plans?
Message-ID: <[e-mail]>
Organization: Utopia Planetia Shipyards - Mars
References: <53satv$[e-mail]>
Date: Mon, 14 Oct 1996 14:15:05 GMT
Lines: 27
Sender: [e-mail]

In article <53satv$[e-mail]> [e-mail] (Marty Albert) writ
es:
-Hello, Folks:
-
-My radio club (The Eastern Ozarks Amateur Radio Club) and I are
-looking for plans for a small transmitter to be used in Fox Hunts.
-
-Something in the very low power range (10 mw would be plenty!) and
-maybe even with a voice chip although a code output would work as
-well.

I'd start with an old HT (Icom 2AT or similar) and either build a keyer from
an EPROM, counter, and 555s (see the handbook for the circuit) or use a
timer to trip a voice chip like the Radio Shack one or one from a greeting
card.  For a real nice setup, look at http://home.navisoft.com/agrelo/ae.htm
Joe sells some very nice mini transmitters and DVKs, as well as a very
nifty doppler DF'er.

I'd stay away from the Ramsey FM-6 transmitter; if you do build it,
MAKE SURE YOU ADD AN EXTERNAL FILTER and put it on a spectrum analyser.
It has *no* output filtering and puts out spurs and harmonics all over the
place.  Not sure about their "Sly Fox" transmitter, but I'd put that on the
analyzer too, given Ramsey's reputation...
/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] Sat Oct 19 10:09:53 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!fu-berlin.de!news.dfn.de!news.kfa-juelich.de!djukfa11!iff161
Organization: Forschungszentrum Juelich
Date: Wed, 16 Oct 1996 20:50:15 +02
From: Bob Mueller <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FRG-7 probably has no PLL
Lines: 40

There have been several postings on the FRG-7 receiver, concerning locking of
the "PLL".  I would appreciate anyone having the straight dope available
correcting the following if I am wrong;  I am hoping to stimulate reconsider-
ation as I believe the FRG-7 has no PLL!  (I am in no position to check this a
s
I have no schematic around but)I vaguely recall     a block diagram and seeing
a Wadley loop.
     If my memory has not failed me (and I do have a schematic for an FRG-7000
,
however that is related to the FRG-7), then the synthesizer is based on mixing
harmonics from a 1 MHz quartz crystal with a tunable LC oscillator. The mixer
products are filtered in   a low frequency LC filter with enough selectivity t
o
remove most of the mixed down harmonics except the desired one (about -70 dB
for the nearest harmonics at +/- 1MHz).   After this cleaning up and enough
amplification the output of the filter amplifier is mixed with the above
mentioned LC oscillator output in a way  that drift of the LC oscillator is
cancelled.  In effect, you get the stability of the crystal oscillator, where
all the hardware just functions as a harmonic selector.
    A couple details; to get the rich supply of harmonics the quartz oscillato
r
drives a needle pulse generator.  The Wadley loop has been used in a couple
other receivers, at least, like the Barlow Wadley, a portable covering from
the broadcast band up to 30 MHz, and the Racal RA17 (I hope I have the correct
model.) Also, the DX302, which closely resembles the FRG-7000, though there
are small differences (looks almost like a carbon copy.)
    To go on, once the filtered harmonic has been generated, it is mixed with
the input signals to produce a low frequency range of outputs which I believe
lie from 2 to 3 MHz in the FRG-7.  Finally, there is a third conversion in wha
t
is practically a broadcast band table radio covering from 2 to 3 MHz instead
of 525KHz to 1600 kHz.  The local oscillator frequency is low enough to
yield acceptable stability for the receivers purpose.
     Please note: nowhere is there any mention of a PLL as is usually meant
by this expression.  The lock lamp would be telling you the LC oscillator is
at a frequency somewhere in the bandpass of the filter amp., and not that a PL
L
is phase locked.
    Anyone with a schematic; please verify and assure us all.

Bob

PS  I hope I am not repeating something which has already been said.  The
system where I get this group tends to throw some messages away  (I see answer
s
for which I see no questions!)



From [e-mail] Sat Oct 19 10:09:55 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!lebanet!usenet
From: Ben Tersian <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: FS: Tubes, amps and coax.
Date: Thu, 17 Oct 1996 15:20:25 -0400
Organization: LebaNet
Lines: 11
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ura.moron.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (Win95; I)
Xref: news1.epix.net rec.radio.amateur.antenna:30102 rec.radio.amateur.digital.misc:19688 rec.radio.amateur.dx:1115 rec.radio.amateur.equipment:40820 rec.radio.amateur.homebrew:20277

Rockwell Collins Intl. HF-8030 New power supply for 8020 series amp. New
in box outstanding at 1500$

6EA8 JAN New in box, $2.00

12AT7 New in box, $3.00 each

RG389 7/8 Inch hardline 50Ohm Super low gloss 40ft length with 2/6ft
pigtails 50.00 Brand New.

JAN 832A New in box $10.00 each


From [e-mail] Sat Oct 19 10:09:55 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (=?ISO-2022-JP?B?GyRCRURCPCEhPWE7ShsoQg==?=)
Newsgroups: rec.radio.amateur.homebrew
Subject: help
Date: 16 Oct 96 00:34:00 GMT
Organization: ucsd usenet gateway
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

help
end


From [e-mail] Sat Oct 19 10:09:56 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!ftn.net!news
From: Tom Holden <[e-mail]>
Newsgroups: comp.modems,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Help re simplex mode for high speed modem
Date: Tue, 15 Oct 1996 15:54:16 -0400
Organization: ftn Internet
Lines: 28
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 159.33.2.49
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I)
CC: [e-mail]
Xref: news1.epix.net rec.radio.amateur.digital.misc:19665 rec.radio.amateur.equipment:40716 rec.radio.amateur.homebrew:20192

Thanks to all who offered advice on my question.

In summary,

1. The designer of the Hayes Smartmodem 300/1200 modems and of the
original AT command set confirmed that it was his intention to support a
unidirectional test mode but is unaware that it was supported in
subsequent Hayes modems or in thos eof other manufacture.

2. I have learned that high speed telephone modems go through an
essential  'training' phase which, of necessity, requires a
bi-directional path for negotiation.

3. Fax modems have been used for unidirectional data transfer at speeds
of up to 9600 bps (V.29, V.27), in particular in Japan. A reference to
the Japanese Packet Radio Users Group (PRUG) failed to turn up any
further info.

4. Suggestions:
        - use a short-haul 4-wire modem
        - develop hardware/firmware specifically for application

Thanks to Rob Janssen, Jeff King, Gary Coffman, Dale Heatherington for
the informative news posts and/or e-mails.

Regards,

Tom Holden, VE3MEO


From [e-mail] Sat Oct 19 10:09:57 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!news.mindspring.com!usenet
From: [e-mail] (Chuck McKenna)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with Battery Charger
Date: Sun, 13 Oct 1996 17:05:17 GMT
Organization: MindSpring Enterprises, Inc.
Lines: 11
Message-ID: <53r7os$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: user-168-121-110-97.dialup.mindspring.com
X-Server-Date: 13 Oct 1996 17:09:48 GMT
X-Newsreader: Forte Free Agent 1.0.82

I need help.  I need to build a battery charger for a radio I bought
at a hamfest a few weeks ago.  It has a 7.6v nicad battery with two
negative contacts one positive contact and one other contact.  I
recently built a 5v regulated power supply and was wondering if I
could use that as a charger and if I can, which contacts do I connect
to?

Thanks,
-Chuck
KF4JPE



From [e-mail] Sat Oct 19 10:09:58 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!news.genuity.net!news.lafn.org!usenet
From: [e-mail] (rene)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help!! for Jonson Radio
Date: Sat, 12 Oct 1996 13:55:43 GMT
Organization: The Los Angeles Free-Net
Lines: 23
Message-ID: <53o7nr$[e-mail]>
NNTP-Posting-Host: 192.168.18.17
X-Newsreader: Forte Free Agent 1.0.82

I need to know if I can still use this Radio. This radio is leased to
us,drivers, by our company.Now my compony has closed (bankruptcy)
and I still have the Radio with me and teletrak.
Question: Can I still use this Radio??
If so How? and what shall I do ?















r




From [e-mail] Sat Oct 19 10:09:59 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!news.uoregon.edu!news.algonet.se!eua.ericsson.se!erinews.ericsson.se!news
From: Christer [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: HENRY 2002/2004 PA problems
Date: 17 Oct 1996 12:49:51 GMT
Organization: Ericsson
Lines: 13
Message-ID: <545a1f$[e-mail]>
Reply-To: Christer [e-mail]
NNTP-Posting-Host: kicc16.eraj.ericsson.se

Just put the two Henry 144 and 432 linears on the air
for some initial on-the-air tests.
They are both new.
When comparing these two new linears with the old
pair which are exactly the same type of henry linears
the screen cuurent on the new ones are HIGH!
Both linear have high currents according to the build-in
amp.meter.

ANy hints!

Chris SM0NCL



From [e-mail] Sat Oct 19 10:10:00 1996
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From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HF Amp using 3-400Z ??
Date: Thu, 17 Oct 1996 22:31:16 -0700
Organization: Aero Head Aviation
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp3.westby.mwt.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; U)

Anybody got an interesting design for an HF amplifier utilizing one or
two 3-400Z Tubes?  I have two I'd like to put to good use.  Scott, N0EDV

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 19 10:10:00 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!news.sprintlink.net!news-peer.sprintlink.net!uunet!news-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: HF Amp using 3-400Z ??
Date: 18 Oct 1996 16:08:04 GMT
Organization: IdeaSource
Lines: 14
Message-ID: <548a14$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 222.229.249.54
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
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X-URL: news://newsgate/[e-mail]

The ARRL Handbook plans for the grounded-grid 4-400 pair should
be a plug-in deal.  This is in the 1981 and 1983 handbooks for sure.

I'm not sure what you should do about cathode bias -- the ARRL plans
used a big Zener diode (hard to find sometimes), but a more recent
Ham Radio Magazine article suggested using a 2N3055 with a Zener on it.
You could easily use an LM317 and a trim pot to have an adjustable
bias supply, and bias the 3-400s for maximum smoke.

I'm typing this from memory, so go easy on the flames, eh?

N6OTQ




From [e-mail] Sat Oct 19 10:10:01 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newspump.sol.net!news.mindspring.com!uunet!in1.uu.net!li.net!bad-news.harborcom.net!usenet
From: Mike Swaney <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF Linear amp kit company?
Date: Sat, 12 Oct 1996 08:13:57 -0500
Organization: Less_Is_Better
Lines: 16
Message-ID: <[e-mail]>
References: <53m12b$[e-mail]>
NNTP-Posting-Host: pve-pm2-53.harborcom.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; I)

The address given for Communication Concepts, Inc. in the Motorola
addendum is:
                CCI
                508 Millstone Drive
                Beavercreek, Ohio  45434-5840
                [phone]

>
> There's a company which sells kits for some of the HF linear amps described
> in Motorola application notes. I've lost their name and address. Would
> someone please be so kind as to send it to me? (I'd also like phone and fax
> numbers if possible; the info is for someone out of the country.)
>
> Thanks!
>
> Roy Lewallen, W7EL


From [e-mail] Sat Oct 19 10:10:02 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!news.mr.net!bell.pconline.com!tsa-p13.pconline.com!user
From: [e-mail] (John Seboldt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF Linear amp kit company?
Date: Thu, 17 Oct 1996 10:42:35 -0600
Organization: MidiPfeifenMusikFunkWerk, GmbH
Lines: 20
Message-ID: <[e-mail]>
References: <53m12b$[e-mail]> <[e-mail]>
NNTP-Posting-Host: tsa-p13.pconline.com
X-Newsreader: NewsWatcher 2.0
X-Stupid-Question: Why are you reading these header lines?

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

> Roy:
>         Its C.C.I. and they advertise in QST.  Just saw their ad a
> couple days ago.  When you get a hold of them, ASK them if the
> Motorola instructions/data come with the kit.  I am interested too,
> and in fact have their catalog here somewhere, but I moved houses
> and I can't find anything yet!

They did provide the app notes with my kit (AN762, 140 watt amp).  Easy to
put together, though one bias transistor they provided was not pin
compatible with the board -- had to do some wire kludges to get the
terminals wired :(.  So you may have to use your brain, not just follow
Heathkit-style instructions.

You also have to box it up, provide switching and output filters, etc.

John Seboldt
[e-mail]


From [e-mail] Sat Oct 19 10:10:03 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Dave Fifield)
Newsgroups: rec.radio.amateur.homebrew
Subject: Hi!
Date: 16 Oct 96 23:01:50 GMT
Organization: National Semiconductor Corp.
Lines: 14
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hi, well someone set up a "separate" list for homebrew anyway heh?

Since I'm an avid homebrewer, I decided to join, WTH.

When I get time later, I'll put out some HB related stuff. Like a list
of my current projects, some wants, some questions etc.

Who else is already subscribed here? I send an email to the reflector
list server asking for "recipients" but it doesn't support that command.
Seems like we'll just have to introduce ourselves to each other.

73 till later,
--
Dave Fifield, KQ6FR


From [e-mail] Sat Oct 19 10:10:04 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!uunet!in1.uu.net!nntp.inet.fi!news.funet.fi!news.cs.hut.fi!freenet.hut.fi!mjappine
From: [e-mail] (Mika Antero JΣppinen)
Newsgroups: rec.radio.amateur.homebrew
Subject: hints for preamps for v/uhf
Date: 18 Oct 1996 22:44:09 GMT
Organization: Freenet finland
Lines: 11
Message-ID: <54917p$[e-mail]>
NNTP-Posting-Host: torstai.hit.fi
X-Newsreader: TIN [version 1.2 PL2]

hi,

        I am looking for helpful hints, schematics and ideas for
        building vhf and uhf preamps for my rig.

        Thanks for reading this!

        Antero Jappinen [e-mail]
        OH2LJH          [e-mail]




From [e-mail] Sat Oct 19 10:10:05 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!server-b.cs.interbusiness.it!usenet
From: Feliciotti Marco <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HY power HF amplifier homebrewing
Date: Mon, 14 Oct 1996 15:27:47 -0700
Organization: Centro Servizi Interbusiness
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: mrhide01.alitalia.it
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win16; I)

I am interested to exchange KNOW-HOW related to build HI pwr
HF amplifier.

I also some hy power parts to sell or swap.

Looking for a 3CX3000A7  or 3CX5000B7 and their socket.


From [e-mail] Sat Oct 19 10:10:06 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!arclight.uoregon.edu!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (KJ4UO)
Newsgroups: rec.radio.amateur.homebrew
Subject: I AM LOOKING FOR YOUR HOMEPAGE!
Date: 18 Oct 1996 22:41:20 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 26
Sender: [e-mail]
Message-ID: <549f4g$[e-mail]>
Reply-To: [e-mail] (KJ4UO)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi,

I am looking to promote my homepage and I believe the best way to
do it is to have it added as a link from your home page.

What I suggest is that I add your banner and link to my home page and
in exchange, you add your banner and link to my home page.

For instance, I have developed some DTMF software, and let's say you
have developed some amateur related projects.  On my home page I would
have:

Excellent link for electronic projects, which would take my visitor
from my page to your page.

On your page, there would be a banner "Excellent DTMF Decoding Software"
this would take your visitor from your page to my page.

So if this sounds like a good deal, email me your banner and homepage
location and I will do the same to you.

I only requirement is that your home page be somewhat electronic related.

Sent the information to [e-mail]

THanks!


From [e-mail] Sat Oct 19 10:10:06 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.sprintlink.net!news-peer.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-stk-11.sprintlink.net!news.glo.be!usenet
From: "LB" <[e-mail]>
Newsgroups: alt.radio.scanner,alt.radio.scanner.uk,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.swap
Subject: Icom 7000 or 7100
Date: 14 Oct 1996 13:53:39 GMT
Organization: Cyber Optics
Lines: 5
Message-ID: <01bbbf70$92968140$[e-mail]>
NNTP-Posting-Host: cyber.glo.be
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft Internet News 4.70.1132
Xref: news1.epix.net alt.radio.scanner:40365 alt.radio.scanner.uk:5296 rec.radio.amateur.equipment:40690 rec.radio.amateur.homebrew:20182 rec.radio.amateur.misc:116456 rec.radio.amateur.space:8558 rec.radio.swap:91196

I'm looking for a Second Hand Icom 7000 or 7100, reasonable price. To be
used for SETI groundstation.

tnx in advance
Luc ON9AAV


From [e-mail] Sat Oct 19 10:10:07 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (S87C51)
Newsgroups: rec.radio.amateur.homebrew
Subject: Intel 80C31 FS:
Date: 13 Oct 1996 14:47:01 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 15
Sender: [e-mail]
Message-ID: <53rdf5$[e-mail]>
Reply-To: [e-mail] (S87C51)
NNTP-Posting-Host: newsbf02.mail.aol.com

Intel 80C31 MicroControllers equals for sell:

These are the Signetics SC87C51CCN40 part number.  They are one time
programmable and have been programmed.  However, these become just like
the 80C31 once pin 31 is tied to ground.  They are the 40 pin DIPS.

They will operate at 12 MHz.

If interested, I would like $2.50 each plus $1.50 shipping for one to
three.  Four or more, I will ship.

Contact [e-mail] for details.

Thanks
KJ4UO


From [e-mail] Sat Oct 19 10:10:09 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!mr.net!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!news.uoregon.edu!xmission!news
From: [e-mail] (Greg)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: Is equipment building a lost art &c...
Date: 12 Oct 1996 03:16:46 GMT
Organization: Your Organization
Lines: 72
Message-ID: <53n2iu$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pm59.cwo.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

How nostalgic, sad, tragic but true,
Greg KB6WKW
who used to scurry up and down Cortlandt Street and Vessey streets in
New York City looking for surplus to turn into things.  I miss the
1625's and 25's - huh?!

In article <[e-mail]>, [e-mail]
says...
>
>To them what's been talking about this, I agree. Homebrewing
>stuff is slowing down. It goes hand in hand with the growing
>concensus that most American band use has devolved to power
>contests (what we in the over-powered "Ohio Valley Teratology
>Net" used to call "horse-races"), bitter abusive disputes and
>positively paranoid rantings that come close to being personal
>broadcast yellow journalism. But that's another topic.
>
>I know a bunch of lunatics who still like to build or at least
>discuss circuit design and the tribulations of making stuff what
>starts out as metaphysics into physically tangible stuff on the
>bench. Most of 'em are either tube-heads (as in: people who still
>like warm boxes of stuff with tubes inside) or they are QRPers,
>or they are something in betwixt. Me? It's a little of both.
>
>On one side of the building fence, there's a lot of nostalgia.
>We bemoan the demise of Heath and the japanization of Drake and
>the disappearance of Collins. We want to have the boxes that we
>had when we were kids. We even build boxes for our own kids (like
>the revamped MRL #2 xtal set that I built for my eight-year-old).
>But we build stuff, and often enough, repair stuff what was munged
>by the ham-fisted (and that "ham" as in "as big as a Virginy-cured
>ham [as in slab of meat about the size of a sumo wrestler]).
>
>On the other side of the fence, there's a lot of proof of viability.
>We wanna show our families or friends or even just ourselves that
>we can still make stuff that works, even if only in a nominally
>successful way. It's the creativity complex, perhaps. But we have
>to have the iron on and the desk cluttered with boxes of poorly
>sorted excess junk: screws and washers and diodes and caps all
>thrown into various small boxes, ice-cube trays and plastic sort-em-
>drawer sets screwed haphazardly to the shack walls. Leonardo and
>Durer live inside us. We gotta make something out of all this crap
>or we don't exist. Kinda like the Russian proverb, only this time
>it's not a matter of eatin' but more a matter of just being.
>
>And those of us old enough to remember the shock of Sputnik do
>indeed have sometimes monumental collections of excess baggage
>in parts and knobs and pieces of equipment that no longer exist.
>We know about Atwater-Kent from our parents' stories while our
>children don't even know what a phonograph or record player is.
>We figure that we're keeping history alive. And maybe we are. Which
>makes it all the more essential that we somehow manage to leave our
>junk boxes behind with the request that they end up in the hands of
>some one -- one solitary remaining someone somewhere somewhen --
>who will say "Holy shit, will you look at these tubes! Man, I gotta
>make somethin' out this!"
>
>That's all we got, brethren and sistern. Somehow we gotta pass
>it on. Otherwise Radio Shack will determine the mental acuity and
>creativity of our grandkids and their grandkids and the Handicapper
>General will indeed have won the day. The Marching Morons ain't
>that far behind.
>
>Build! Kto nye stroit' nye byt'/Den som bygger inte er inte...
>
>73
>Nils
>WB8IJN &c
>(And, yes, my command of Russian is sub-neonatal... So flame me...
>or give me $20!)
>



From [e-mail] Sat Oct 19 10:10:10 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!news.uoregon.edu!xmission!news
From: [e-mail] (Greg)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: 12 Oct 1996 03:25:24 GMT
Organization: Your Organization
Lines: 54
Message-ID: <53n334$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pm59.cwo.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

I stand corrected.  However, now this means that I have to actually
go to the "trouble" of learning, all over again, just like when I was
a kid. H-m-m...
Thanks for the kick start...
Greg KB6WKW

In article <[e-mail]>, [e-mail]
says...
>
>I'm baffled at why this is even a subject for discussion - homebrewing
>is easier than it ever has been, the parts are better than they have
>ever been, and homebrewers can make equipment of unprecedented
>sophistication and performance easier than ever before.
>
>Parts? I've never had any difficulty getting any parts I want.
>Sometimes you have to make a few phone calls. Sometimes you have to
>get them from overseas. The fact that you can't always get things
>locally is irrelevant: in this age of direct overseas dialling and
>credit cards, "local" is meaningless. For the really neat stuff
>sometimes the only way to get onesies and twosies is as samples. So
>what?
>
>PC boards and construction techniques in general are a red herring. My
>approach these days is that one-offs are best done on unetched ugly
>boards, which are quick to make (perfect for let's-try-it-and-see
>experiments), work extremely well up to at least VHF, and can be real
>works of art. I long ago decided that (except for reproducing stuff
>from books and magazines), if I etch an original board, it will be
>surface mount. And please don't start whining about *that* - SMD is
>available, cheap, dead simple, idiot-proof and very nearly
>indestructible. I laid out my first SMD PC board with a straight edge,
>scotch tape and a sharp knife...
>
>The dismal level of technological interest, knowledge and expertise is
>indeed a problem. The way to address it is not to grumble about the
>new tests or new hams, but to acknowledge that now, with it being so
>easy to get on the air, the role of Elmers is more critical than ever
>before. Your licence is your licence to *learn*. Just do it.
>
>I'd like to propose some self-censorship on this subject. Can you
>imagine the effect such discussions have on young or would-be hams?
>"Modern technology's crap! The Good Old Days are over! Face it, loser:
>you missed all the fun!" Ugh. The *real* fun is yet to be, and if some
>hams wish to opt out of technology and live in the past, please at
>least have the common decency to keep your mouths shut and stay out of
>the way of those of us who still understand what "technical
>investigations and self-training" means.
>
>Laura Halliday VE7LDH         "C'est une femme mutine, assez
>[e-mail]           elegante, grave et legere, ayant le
>[e-mail]               sens du confort et du plaisir
>Locator: CN89mg                en tout." - C. Deneuve
>



From [e-mail] Sat Oct 19 10:10:11 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!feed1.news.erols.com!arclight.uoregon.edu!news.uoregon.edu!disco.iinet.net.au!opera.iinet.net.au!news
From: [e-mail] (Richard Hosking)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Sat, 12 Oct 1996 21:49:45 GMT
Organization: iiNet Technologies Pty Ltd
Lines: 8
Message-ID: <53p358$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: grunge202.nv.iinet.net.au
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:


Goodonya Laura!
VK6BRO
[e-mail]
http://www.iinet.net.au/~richardh



From [e-mail] Sat Oct 19 10:10:12 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.texas.net!news.kei.com!news.thenet.net!uunet!in1.uu.net!crusty.teleport.com!nntp0.teleport.com!ip-pdx16-21
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Sun, 13 Oct 96 21:37:13 GMT
Organization: EZNEC Antenna Software
Lines: 46
Message-ID: <53rnc7$[e-mail]>
References: <[e-mail]> <53n334$[e-mail]>
NNTP-Posting-Host: ip-pdx16-21.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

>In article <[e-mail]>, [e-mail]
>says...

>. . .
>PC boards and construction techniques in general are a red herring. My
>approach these days is that one-offs are best done on unetched ugly
>boards, which are quick to make (perfect for let's-try-it-and-see
>experiments), work extremely well up to at least VHF, and can be real
>works of art. I long ago decided that (except for reproducing stuff
>from books and magazines), if I etch an original board, it will be
>surface mount. And please don't start whining about *that* - SMD is
>available, cheap, dead simple, idiot-proof and very nearly
>indestructible. I laid out my first SMD PC board with a straight edge,
>scotch tape and a sharp knife...
>. . .

I'd like to add my strong agreement to this. Circuit boards are super if
you want to make several copies of something. But for a single unit,
they're totally unnecessary. It's frequently much harder to get good
performance of RF circuits on a circuit board than it is on an "ugly" style
ground plane. Being able to build point-to-point in three dimensions
enables many connections to be shorter.

Years ago I was visited by a ham who had been living in Tonga, in the South
Pacific. He had been trying to get material together to build PC boards so
the local hams could build rigs. He'd experimented with using dilute
battery acid for echtant, and made other efforts to make do with what he
had available, but hadn't been very successful. He visited my place and
used some of my homebrew "ugly" construction rigs, then we went to Wes
Hayward's (W7ZOI) place and he saw and used some of Wes's rigs. He was
amazed that such ugly rigs could work so well, and told us so. He had been
sure, after reading all the articles in popular magazines, that PC boards
were necessary. Armed with this new information, he returned to Tonga. I
talked with him on the air a short time later, using a new rig he had
built, "ugly" style. "Looks like hell," he said, "but works terrifically.
And we're on the air."

The term "ugly construction" comes from an article by Hayward (KA7EXM) and
Hayward (W7ZOI) in August 1981 _QST_ titled "The 'Ugly Weekender'". For
more information about this technique, Look in the index of _The ARRL
Handbook_ under "Ugly construction".

I think the constant emphasis on PC board construction has done as much to
supppress homebrewing as any other factor.

Roy Lewallen, W7EL


From [e-mail] Sat Oct 19 10:10:13 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!rain.fr!news.sprintlink.net!news-dc-9.sprintlink.net!cc.iu.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: 14 Oct 1996 04:02:04 GMT
Organization: InternetU, Inc.
Lines: 12
Message-ID: <53sdvs$[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rak2$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: netport-71.iu.net
X-Newsreader: IBM NewsReader/2 2.0

In <53rak2$[e-mail]>, [e-mail]  (Carl Stevenson) writes:
>far out of touch with today's technological reality that they haven't
>yet accepted the fact that progress "is a done deal" and that there's
>nothing that can stop it ...

i wonder what the news of the death of carbon comps will do for 'em..8)
>73,
>Carl - wa6vse
>[e-mail]

bill wb9ivr



From [e-mail] Sat Oct 19 10:10:14 1996
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From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: 14 Oct 1996 13:32:14 -0700
Organization: BEST Internet Communications
Lines: 40
Message-ID: <53u80e$[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rnc7$[e-mail]> <53u1op$[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <53u1op$[e-mail]>,
Dana Myers <[e-mail]> wrote:
>In article <53rnc7$[e-mail]>,
>Roy Lewallen <[e-mail]> wrote:
>>
>>The term "ugly construction" comes from an article by Hayward (KA7EXM) and
>>Hayward (W7ZOI) in August 1981 _QST_ titled "The 'Ugly Weekender'". For
>>more information about this technique, Look in the index of _The ARRL
>>Handbook_ under "Ugly construction".
>>
>>I think the constant emphasis on PC board construction has done as much to
>>supppress homebrewing as any other factor.
>
>I'm in violent agreement with Roy on this.  I think that magazines tend
>to want PCBs to be available so that casual builders can order a
>PCB, stuff it and have a working thingy.  That's nice for "canned"
>projects, but experimentation ends up being stifled.  I've been
>building ugly things for some time, and it really is great.  I'm
>not stuck using someone else's design - I can (and do) frequently
>cook up my own.
>
>The 2m/220 transverter project in the '94 (and maybe later)
>ARRL Handbooks is a great example of what ugly can be.
>
>
>--
> * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are mine and should *
> * [phone]               | not be interpreted or represented as     *
> * [e-mail]      | those of Sun Microsystems, Inc.          *
>

About 2 years ago, I built a 6GHz synthesizer using "Ugly" construction
techniques.  In this case, it was a combination of dead bug, holly board
and zero lead length coaxial techniques with SMT components.  It worked
great. Even though it was done for my employer, it could have been easily
a ham homebrew project.  The only special tools were a fine tip iron and
an articulated magnified lamp.

Steve M.  WF6R



From [e-mail] Sat Oct 19 10:10:15 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Tue, 15 Oct 96 02:30:01 GMT
Organization: EZNEC Antenna Software
Lines: 25
Message-ID: <53ust5$[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rnc7$[e-mail]> <53u1op$[e-mail]>
NNTP-Posting-Host: ip-pdx06-10.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <53u1op$[e-mail]>,
   [e-mail] (Dana Myers) wrote:
>In article <53rnc7$[e-mail]>,

>. . .  I think that magazines tend
>to want PCBs to be available so that casual builders can order a
>PCB, stuff it and have a working thingy.  That's nice for "canned"
>projects, but experimentation ends up being stifled.  I've been
>building ugly things for some time, and it really is great.  I'm
>not stuck using someone else's design - I can (and do) frequently
>cook up my own.
>. . .

It's difficult or impossible to get an article on a HB rig published in QST
unless it includes a way to buy a PC board and, preferably, a kit of parts.
(In fact, a couple of recent articles have been little more than a
description of products you can buy, and don't contain enough information
to allow you to build them yourself even if you want to.) The reason a
board is practically a requirement is that the readers have told the
publisher -- the ARRL -- very strongly that this is what they want.

Fortunately, there are other magazines without this requirement, most
notably QEX and some of the QRP club publications.

Roy Lewallen, W7EL


From [e-mail] Sat Oct 19 10:10:16 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!netcom.com!wa2ise
From: [e-mail] (Robert Casey)
Subject: Re: Is equipment building and repair a lost art? NO!
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
References: <53rnc7$[e-mail]> <53u1op$[e-mail]> <53ust5$[e-mail]>
Date: Tue, 15 Oct 1996 17:09:59 GMT
Lines: 19
Sender: [e-mail]

In article <53ust5$[e-mail]> [e-mail] (Roy Lewallen) w
rites:
>
>It's difficult or impossible to get an article on a HB rig published in QST
>unless it includes a way to buy a PC board and, preferably, a kit of parts.
>(In fact, a couple of recent articles have been little more than a
>description of products you can buy, and don't contain enough information
>to allow you to build them yourself even if you want to.) The reason a
>board is practically a requirement is that the readers have told the
>publisher -- the ARRL -- very strongly that this is what they want.
>
>Fortunately, there are other magazines without this requirement, most
>notably QEX and some of the QRP club publications.
>
Just "publish" your HB rigs and stuff in this newsgroup, but post the
pictures, schematics, and PC board image files over in
alt.binaries.pictures.misc or 12hr or clocks
You'll have to hunt thru all the porno there to find the images, but
that's where binaries belong.
I essentially did this when I posted about the AM radio with sub-mini tubes.


From [e-mail] Sat Oct 19 10:10:17 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.indirect.com!usenet
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Tue, 15 Oct 1996 17:26:00 GMT
Organization: The Coriolis Group, Inc.
Lines: 23
Message-ID: <540lgs$[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rak2$[e-mail]>
NNTP-Posting-Host: 165.247.88.52
X-Newsreader: Forte Free Agent 1.0.82

[e-mail]  (Carl Stevenson) wrote:

>Laura .. problem is the tubes are hard to find ...

Egad, man--tubes are a glut on the market!!  The new Alltronics
catalog lists hundreds of them, and Antique Radio Supply sells every
tube I ever heard of, and loads more that look like they came from
Mars.  In my files are probably ten catalogs that offer tubes.
Variable caps, well, that's more of a challenge, but the more generic
sorts are out there.  Fair Radio Sales is a good one to watch--but the
point is that almost anything a homebrewer could want is in somebody's
catalog, and if yer gonna play the game ya gotta pay the dues and get
those catalogs.

This could be a golden age for building your own gear.  The only
challenge is to figure out how to make it happen.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona




From [e-mail] Sat Oct 19 10:10:18 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.ais.net!usenet
From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: 15 Oct 1996 01:50:03 GMT
Organization: American Information Systems, Inc.
Lines: 23
Message-ID: <53uqkb$[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rak2$[e-mail]> <53sdvs$[e-mail]>
Reply-To: [e-mail] (Carl Stevenson)
NNTP-Posting-Host: ts01-17.dialup.ais.net
X-Newsreader: IBM NewsReader/2 v1.2.5

In <53sdvs$[e-mail]>, [e-mail] writes:
>In <53rak2$[e-mail]>, [e-mail]  (Carl Stevenson) writes:
>>far out of touch with today's technological reality that they haven't
>>yet accepted the fact that progress "is a done deal" and that there's
>>nothing that can stop it ...
>
>i wonder what the news of the death of carbon comps will do for 'em..8)
>>73,
>>Carl - wa6vse
>>[e-mail]
>
>bill wb9ivr
>

Can you still buy those things? :-)

Seriously, though, I haven't designed or built anything in about five
years that wasn't surface mount ...

Carl - wa6vse
[e-mail]




From [e-mail] Sat Oct 19 10:10:20 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.mindspring.com!gradyr
From: [e-mail] (Grady Russell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Thu, 17 Oct 1996 01:17:00 -0500
Organization: Canadians for Global Warming
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rak2$[e-mail]> <540lgs$[e-mail]>
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Well I'm glad to see at least one person thinks it's not a lost art...now
could one of you find gentleman (or ladies) point me in some good
directions to build a base 2m radio? Just a tech now but wanting to learn
about building one myself,etc. I keep looking for sources but really don't
have much to go on.

TIA,
Grady
KF4LDO


From [e-mail] Sat Oct 19 10:10:20 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news1.gte.net!usenet
From: Jim Conn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Thu, 17 Oct 1996 10:13:05 -0700
Organization: GTE Intelligent Network Services, GTE INS
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rak2$[e-mail]> <540lgs$[e-mail]> <[e-mail]>
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Grady Russell wrote:
>
> Well I'm glad to see at least one person thinks it's not a lost art...now
> could one of you find gentleman (or ladies) point me in some good
> directions to build a base 2m radio? Just a tech now but wanting to learn
> about building one myself,etc. I keep looking for sources but really don't
> have much to go on.
>
> TIA,
> Grady
> KF4LDO

Hi,

I suggest the Ten-Tec 2m kit, as an excellent, low cost, way to start!

73,
Jim - AD4VL




From [e-mail] Sat Oct 19 10:10:21 1996
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From: "Bill C." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Thu, 17 Oct 1996 11:50:13 -0700
Organization: The Internet Ramp
Lines: 3
Message-ID: <[e-mail]>
References: <[e-mail]> <53n334$[e-mail]> <53rnc7$[e-mail]> <53u1op$[e-mail]>
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Ugly is beautiful!!




From [e-mail] Sat Oct 19 10:10:23 1996
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From: [e-mail] (David Brodbeck)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: 15 Oct 1996 19:13:41 GMT
Organization: Michigan Technological University
Lines: 24
Sender: [e-mail]
Message-ID: <540np5$[e-mail]>
References: <53rnc7$[e-mail]> <53u1op$[e-mail]>
    <53ust5$[e-mail]> <[e-mail]>
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In article <[e-mail]>,
        [e-mail] (Robert Casey) writes:
> Just "publish" your HB rigs and stuff in this newsgroup, but post the
> pictures, schematics, and PC board image files over in
> alt.binaries.pictures.misc or 12hr or clocks
> You'll have to hunt thru all the porno there to find the images, but
> that's where binaries belong.
> I essentially did this when I posted about the AM radio with sub-mini tubes.

--> Another good approach is to make the schematics available somewhere on
the World Wide Web.  I know of several places where it's relatively easy to
put up a small page.

--
        .---.        .-----------  +-----------------------------------------+
       /     \  __  /    ------    | David Brodbeck       dmbrodbe @ mtu.edu |
      / /     \(  )/    -----      |                                         |
     //////   ' \/ `   ---         |   EE major at Michigan Tech, Houghton   |
    //// / // :    : ---           |                                         |
   // /   /  /`    '--             | Homepage: http://yiff.maxie.com/~david/ |
  //          //..\\               +-----------------------------------------+
=============UU====UU=========================================================
             '//||\\`
               ''``


From [e-mail] Sat Oct 19 10:10:24 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!news.walltech.com!news.his.com!node2.frontiernet.net!news.frontiernet.net!mulveyr
From: [e-mail] (Rich & Katy Mulvey)
Newsgroups: rec.radio.amateur.homebrew,,rec.radio.amateur.misc
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: 11 Oct 1996 11:58:57 GMT
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On 9 Oct 1996 04:11:02 GMT, rdb <[e-mail]> wrote:
>My question is this:
>Are we who enjoy the technical aspects of the hobby headed for
>extinction? What do you think?

   Well, just drop by the QRP list at lehigh.edu sometime.  The group
is highly devoted to homebrewing, and is growing every day.  In
addition, just look at the number of kit companies and construction-
oriented clubs that have popped up in the past few years. Granted, QRP
is a niche market, but it is still a *growing* niche market, and
doesn't show any signs of slacking off.

- Rich


--
My mailer has the unfortunate tendency to bounce 10,000 copies of any
junk mail I receive back to the sender.  Be warned.





From [e-mail] Sat Oct 19 10:10:25 1996
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From: [e-mail] (Mark Little)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: re: is equipment building and repair a lost art? your comments, please.
Date: 13 Oct 96 07:20:50
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>
>
> In article <[e-mail]>,
> Robert Casey <[e-mail]> wrote:
>
> >Right now, I'm playing around with an old early 60's AA5 AM tube radio,
> >substituting sub-mini "pencil" vacuum tubes for the standard 7 pin tubes
> >(using a heater voltage transformer to run the 12V and 6V heaters).  No
> >'real' reason, other than making a radio that might have been manufactured
> >if semiconductors had not been invented, and sub-mini tubes being the
> >"next generation" of tubes for AM radios (assume that mass production of
> >pencil tubes would get the cost down).
>
> I'm trying to take a 90's approach.  Just got in my box of minicircuits
> VCOs, and made a logarithmic amp from the National Semiconductor data
> sheet for one of their opamps... Together with info gleaned from KK7B's
> direct conversion receiver, a spectrum analyzer is my next project.
>
> With a VCO and a mixer, a nice 0-50 MHz VFO should take up the size of a
> pack of cigarettes, and is also on the project list.
>
> >Having fun.
>
> Some things never change.
>
> Bruce
> N6URH
> .

Amateur Radio is the place for ALL forms of radio activity, nostalgic or
leading edge (well, relatively speaking anyway). As a fraternity, we should
be encouraging this spread of activity.

I started in electronics when germanium transistors were hot property
(literally from thermal run-away) and valves were bread and butter. I wouldn't
consider using valves in a project, but I still like to see the craftmanship
that was evident with the loomed wiring, component leads bent just so around
the terminal posts, etc. The vintage cars of radio.


Mark.




From [e-mail] Sat Oct 19 10:10:26 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
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From: [e-mail] (Robert Casey)
Subject: Re: is equipment building and repair a lost art? your comments, please.
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
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I just finished my Sub-mini tube AM radio, and it works reasonably
well.  Imagine sub-mini tubes running directly off the powerline
(except for the heaters have a transformer).  Took an image file
of the innards of this radio, and also drew a diagram as JPG
files.  will post when Netcom becomes stable again, their system
is slow right now.


From [e-mail] Sat Oct 19 10:10:28 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
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From: [e-mail] (Jim Lowman)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Message-ID: <[e-mail]>
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Gary Coffman ([e-mail]) wrote:

: I think many of today's Techs (and other classes) aren't homebrewing.
: Part of the reason for that is many of them are new to amateur radio
: and aren't quite sure of their skills and knowledge yet, IE they're
: a bit intimidated by the thought of building their own equipment. And
: part of it is the wealth of available off the shelf equipment, so there
: is no pressing need to build. But I take issue with the idea that you
: must be on HF to homebrew.

Didn't mean to give that impression; sorry.



: I'm frankly flabbergasted by this comment in reference to the IC-706.
: In my opinion, the IC-706 is the most intuitive and operator friendly
: radio I've ever owned. It takes about 5 minutes to learn to navigate
: the menus, after that you can toss the instruction book (even without
: the initial resort to the instruction book, you can quickly figure
: things out). Every feature is clear and basically self-explanatory.

Maybe for someone who is experienced with navigating menu systems; these OTs
were not.  The point they were making is that there were more similarities
in operation and naming of controls from one rig to another, on the older
gear.  I have to admit to some frustration with my IC-706 and the menus, but
it goes get easier with experience.

73 de Jim - KF6CR



From [e-mail] Sat Oct 19 10:10:29 1996
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From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: 15 Oct 1996 13:50:29 GMT
Organization: Netcom
Lines: 48
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X-NETCOM-Date: Tue Oct 15  6:50:29 AM PDT 1996

In <[e-mail]> [e-mail] (Gary
Coffman) writes:
>
>
>.... SMD is a godsend for the homebrewer. It is much easier than
>working with leaded parts.
>
Gary, I have to disagree.  On a PCB leaded parts are *much* easier to
work with, for the following reasons:

    1.  You don't need a magnifying glass to read their value (if
        you're lucky enough to have an SMD part with a value printed
        on it).

    2.  With a leaded part you just stick the leads through the
        holes, bend them slightly (so that the part doesn't fall
        out), turn the board over, and solder.  With SMD the best
        technique I've seen is:  tin one pad, grab part with a pair
        of tweezers, hold one end of part to this pad, heat with
        part & pad with soldering iron, press the part down as the
        solder melts so that the part is now flush with board,
        solder the other end of part (or other pins, if dealing
        with a device with more than 2 terminals).  A technician
        at work is great doing this, but I *always*
        have problems with the part not sitting flush, or shifting
        slightly, or whatever!  Oh, and a good pair of tweezers is
        a must, and the proper kind are hard to find.

        And a good soldering iron is essential (Metcal stations are
        great).

    3.  With a through-hole part it's much easier to see if it was
        correctly soldered.  I've had more problems over the
        years with SMD parts whose leads are not all soldered to
        pads than I have ever had with through-hole parts.

Having done lots of work with both SMD and leaded parts, I much prefer
prototyping and building with leaded parts.  Perhaps the only
construction topic where SMD parts might be preferable to leaded is in
rework - SMD's are much easier to remove.

If I were a kit manufacturer I'd think twice (or more!) about supplying
kits with SMD's.  Imagine the errors (and complaints) from incorrect
part placements, alone!

- Jeff, WA6AHL




From [e-mail] Sat Oct 19 10:10:31 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <53f8km$[e-mail]> <[e-mail]> <[e-mail]> <53jdt3$[e-mail]>
Date: Sun, 13 Oct 1996 19:30:14 GMT
Lines: 75

In article <53jdt3$[e-mail]> [e-mail] (Nick England) write
s:
>I'd also have to include the technology shift from point-to-point
>wiring to printed circuit boards.
>
>This changed the relationship of kit-building to homebrewing. In the
>point-to-point days the functional relationships of all the components
>was pretty exposed and clear. Homebrew gear and kit gear looked very
>very similar except for the quality of the sheet metal and paint job.
>
>This all changed with the intro of PC boards. Kits and homebrew
>diverged. The direct relationship of component to function was hidden
>and homebrewers simply couldn't fabricate PC boards *easily*.
>Still can't, but at least design and layout is a lot easier now.

I don't know about that. PC board fabrication is pretty easy, at
least if you don't want multilayer boards, which you usually don't
for RF projects. And the rise of SMD components has eliminated
the need for lots of precisely drilled holes too. SMD is a godsend
for the homebrewer. It is much easier than working with leaded
parts.

CAD has made layout lots easier, but tape still works, as does
simply drawing the circuit on the blank board with a permanent
marker. So cost and complexity of layout tooling really isn't
a concern for most projects.

I usually print to transparencies with my laser printer and
photographically transfer the circuit to the board, but I've
also used a plotter directly onto the board (you need a plotter
which will run very slowly to lay down enough ink, and that's
good because it usually means you want an older cheaper plotter).

I think the ideal setup would be a photoplotter. I've thought
about taking one of my old junk plotters and replacing the
pen with a laser diode. I'd use the pen down and pen up commands
to turn the laser on and off. That way I could plot the circuit
directly to photosensitive board stock. My only concern is that
the red light won't work with the common photoresists. Perhaps
there are resists suitable for this. Has anyone tried this?

Etching is an easily learned skill, and the equipment needed is
very modest. I've done it with just a glass bowl in the sink,
though a cheap aquarium tank and bubbler can lead to nicer boards,
as can good temperature control of the solution. All you need can
be found at the local fishy shop, or at a garage sale.

The one real difference is that you need to be pretty sure of the
wiring of your circuit before you commit it to copper. While you
can hack a board later to make revisions, it is often ugly and
can introduce strays you don't want. This is where the circuit
simulation tools can come in handy.

I also do a bit of dead bug style building. I use unetched board
as the substrate and solder or hot glue components to it with
their little legs sticking up in the air. I use solderable
wirewrap wire to make the connections, spinning it on the pins
then soldering it later when all the connections are made. That
works pretty good.

For most low impedance RF work, if I need a tiepoint other than
a component pin, I'll just solder a 10M resistor to the board
and stand it up so I can use the other end as a tiepoint. Of
course direct access to the groundplane is everywhere on the
unetched board. I don't do it, but I've seen others glue down
small pieces of circuit board to form isolated pads.

IMHO there are many good ways to build using copperclad board.
I like it much better than the old point to point style wiring.

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 Oct 19 10:10:32 1996
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From: [e-mail] (Paul Ostby)
Newsgroups: rec.radio.amateur.homebrew
Subject: Is equipment building and repair a lost art? Your comments, please.
Date: 15 Oct 96 20:08:57 GMT
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Originator: [e-mail]

[e-mail] (Gary Coffman) writes:
>I think the ideal setup would be a photoplotter. I've thought
>about taking one of my old junk plotters and replacing the
>pen with a laser diode. I'd use the pen down and pen up commands
>to turn the laser on and off. That way I could plot the circuit
>directly to photosensitive board stock. My only concern is that
>the red light won't work with the common photoresists. Perhaps
>there are resists suitable for this. Has anyone tried this?

I've tried using a 670nm, 4mW laser diode.  It doesn't work with any
photoresists that I've tried.  The ones I tried were:
     GC Electronics "Positive-type" resist (cat # 22-074)
     M.G. Chemicals "KPR Photo Resist" (negative type, cat # 701)
     Ever-Muse presensitized P.C.B. (Circuit Specialists Inc. cat # PP101)
I tried exposures as long as 30 minutes on one spot.

I, too, would like to hear from anyone who knows of a resist that *will* work
with a laser diode.

Paul Ostby



From [e-mail] Sat Oct 19 10:10:33 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Message-ID: <[e-mail]>
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Gary Coffman ([e-mail]) wrote:
: And the rise of SMD components has eliminated the need for lots of
: precisely drilled holes too. SMD is a godsend for the homebrewer. It
: is much easier than working with leaded parts.

Come on, Gary. 'Fess up. How do you replace a 120 lead qfp ic?
I think SMD is a horror for anyone who wants to service a circuit
board. You might be able to replace a resistor, but servicing
any active device beyond a simple transistor is damn near impossible.



From [e-mail] Sat Oct 19 10:10:34 1996
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From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: 16 Oct 1996 14:18:00 GMT
Organization: Netcom
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In <[e-mail]> [e-mail] (Gary
Coffman) writes:

>>    2.  With a leaded part you just stick the leads through the
>>        holes, bend them slightly (so that the part doesn't fall
>>        out), turn the board over, and solder.
>
>Well, first you have to *drill* all those holes, and precisely too.
>That's a *very* major pain in the ass. I've got a CNC drill, but it
>takes so long to set up I can be finished building a SMD board by
>the time I have a thru-hole board drilled. If you're buying your
>circuit boards, you aren't homebrewing, you're doing kit assembly.
>

I prototype two ways:  dead bug style and perf-board style.  In neither
case do I drill holes.  Dead-bug style is damn fast, but perf board
looks neater and is more mechanically stable.  And best of all, the
holes are already there!

In the past I've used a drill-press (although holes need to be fairly
spot-on, through-hole parts will, in most cases, tolerate some slop).
But why go through the hassle?  Interestingly, in twenty years of
engineering I've *never* seen an engineer prototype a circuit by
actually laying out a PCB.  It's *always* been wire-wrap, dead-bug, or
perf-board.  Some may do PCB proto's (probably for microstrip
circuits?), but I've not come across them.

>
>Your SMD technique is *horrible*.

To each his own.  It's actually a very common technique, it doesn't
require any special tools (other than a *good* pair of tweezers and a
tiny point on the soldering iron (again, Metcals are GREAT) - no solder
paste, no hot-air tool), and it works *very* well.  Our tech can
assemble a board very quickly using this technique, and the board looks
like it came off the manufacturing line.  Hot-air is only used to
remove large IC's.

But why use SMD parts for home-brew in the first place?  Leaded parts
are so much easier to use.

- Jeff, WA6AHL





From [e-mail] Sat Oct 19 10:10:35 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <53f8km$[e-mail]> <[e-mail]> <[e-mail]> <53jdt3$[e-mail]> <[e-mail]> <[e-mail]>
Date: Wed, 16 Oct 1996 17:16:13 GMT
Lines: 58

In article <[e-mail]> John Rabson <word.factory@zetnet
.co.uk> writes:
>In message <[e-mail]>
>        [e-mail] (Gary Coffman) writes:
>
>> SMD is a godsend
>> for the homebrewer
>
>What do I need to use SMD? (I have ordinary gear for homebrew but my
>vision and dexterity are not what they were)

I'm hyper-farsighted. That means I can't even see the darn little
parts without my glasses. I use one of two visual aids. In the field
when I'm doing repairs, I use an 8x B&L clip on jeweler's loupe. This
clips on the temple of your regular glasses and can pivot out of the
way. It is really slick, and lets me see the little buggers. It only
cost a few bucks from Jensen Tools. There are import copies of it
available, I see them at hamfests being sold by the imported tool
dealers, but they aren't as nicely made, and are only a few bucks
cheaper. Buy the good one.

At the bench I have an old B&L binocular microscope head which I've
adapted to a floating arm. It offers 10x and 30x and has a long working
focal distance so I can get my hands under it to work on the board.
These things were expensive as sin new, I saw one recently in a catalog
for over $1,000, but I got this one at Dayton for $75. The guy had
stands for them too, but he wanted more for the stand than for the
microscope head. I made my own stand.

To keep your hands steady, get a couple of sand bags, or wrist rests
for computer use. If you can rest your forearms, you'll be amazed
at how steady your hands become. Avoid too much coffee too. :-)

Now the other tools you need are pretty cheap. You need a static
hot air source. You can buy really expensive bench mount units,
but I find the little pocket Weller Pyropen Jr fine for all my
work. This is a butane powered soldering and hot air tool about
the size of an old fashioned fountain pen. There are soldering tips
available for it to allow you to work on conventional parts, and hot
air shrouds to allow you to use it with SMD. Weller makes a bigger
unit, called just the Pyropen. It is too big for most SMD work,
but with a heavy tip it is just right for installing PL-259
connectors outside in a wind storm. Don't get the two confused.

You'll also need some wooden toothpicks and some SMD solder paste.
And a pair of really sharply pointed tweezers. I'd also recomend
having a bit of modeling clay handy, some solderwick, and some
flux. Any anti-static protection you use for leaded parts will
work for SMD too.

I gave a brief description of how to use this stuff in another
message. If you need more detail, ask.

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 Oct 19 10:10:36 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!feed1.news.erols.com!howland.erols.net!netcom.com!wa2ise
From: [e-mail] (Robert Casey)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
References: <53jdt3$[e-mail]> <[e-mail]> <[e-mail]>
Date: Wed, 16 Oct 1996 03:26:24 GMT
Lines: 18
Sender: [e-mail]

In article <[e-mail]> [e-mail] (Thomas G. McWilliams) wr
ites:
>Gary Coffman ([e-mail]) wrote:
>: And the rise of SMD components has eliminated the need for lots of
>: precisely drilled holes too. SMD is a godsend for the homebrewer. It
>: is much easier than working with leaded parts.
>
>Come on, Gary. 'Fess up. How do you replace a 120 lead qfp ic?
>I think SMD is a horror for anyone who wants to service a circuit
>board. You might be able to replace a resistor, but servicing
>any active device beyond a simple transistor is damn near impossible.
>

You could do "surface mount" style with regular DIP thru hole parts,
bend the leads out so it makes a flat footprint.  Resistors and caps
and transistors are also easy.  IF transformers are more difficult,
but one could bend the leads a little bit (make a little hook at the
lead end).  I've done this and it worked.  Or drill the holes for the
hard parts only.


From [e-mail] Sat Oct 19 10:10:37 1996
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From: arsenaul@lss1105 (Brian Arsenault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: 17 Oct 1996 13:17:23 GMT
Organization: EMC Corp. - The Storage Architects
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X-Newsreader: TIN [version 1.2 PL2]

Thomas G. McWilliams ([e-mail]) wrote:
: Gary Coffman ([e-mail]) wrote:
: : And the rise of SMD components has eliminated the need for lots of
: : precisely drilled holes too. SMD is a godsend for the homebrewer. It
: : is much easier than working with leaded parts.

: Come on, Gary. 'Fess up. How do you replace a 120 lead qfp ic?
: I think SMD is a horror for anyone who wants to service a circuit
: board. You might be able to replace a resistor, but servicing
: any active device beyond a simple transistor is damn near impossible.

I'll tell you how you replace a 120-pin QFP part.  Take a nice, sharp
X-Acto Knife and at the case of the device where the leads come in,
carefully cut the pins so the part comes out but the pins stay
soldered to the board.  I can't emphasize C-A-R-E-F-U-L-L-Y enough
because if you go to fast, you can rip the etch off the board.  Now,
take your soldering iron and some solder wick and run along the board
perpendicular to the pads and the pins will come off smoothly.  Clean
up the board and solder on the new device.

BTW, this takes a nice, steady hand to do, but with just a little
practice it's not too bad.  Here at work, we change out 240-pin QFP
parts and I've been asked on a number of occasions to do it.  Loads
of fun!

Brian

*********************************************
*                                           *
*  Brian Arsenault - N1FIY                  *
*  email: [e-mail]                  *
*                                           *
*  EMC Corporation - The Storage Architects *
*                                           *
*********************************************


From [e-mail] Sat Oct 19 10:10:38 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!panix!newsfeed.internetmci.com!uunet!in3.uu.net!news.maz.net!news.allcon.net!jgfl1!griffin
From: [e-mail] (Jens Goerke)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
X-Newsreader: TIN [version 1.2 PL2]
Organization: Private Multi-Site
Message-ID: <[e-mail]>
References: <53f8km$[e-mail]> <[e-mail]> <[e-mail]> <53jdt3$[e-mail]> <[e-mail]>
Date: Thu, 17 Oct 1996 18:46:34 GMT
Lines: 20

Gary Coffman ([e-mail]) wrote:
[...]
> I usually print to transparencies with my laser printer and
> photographically transfer the circuit to the board, but I've
> also used a plotter directly onto the board (you need a plotter
> which will run very slowly to lay down enough ink, and that's
> good because it usually means you want an older cheaper plotter).
[...]

If your software can print to a PostScript file, you should
try taking this file to a typesetting studio. They're able
to use resolutions of up to 3600 dpi on transparent film
material that's sturdy enough to last you several batches
of PCBs. A roughly letter shaped page should be between $10
and $20.

Hope that helps,
        Jens, DB9LL
--
What _was_ you username again? <clickety clickety click>


From [e-mail] Sat Oct 19 10:10:41 1996
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From: "Carl D. Walker" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: Thu, 17 Oct 1996 19:30:30 -0400
Organization: None to speak of.
Lines: 26
Message-ID: <[e-mail]>
References: <53f8km$[e-mail]> <[e-mail]> <[e-mail]> <53jdt3$[e-mail]> <[e-mail]> <[e-mail]>
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Thomas G. McWilliams wrote:
>
> Gary Coffman ([e-mail]) wrote:
> : And the rise of SMD components has eliminated the need for lots of
> : precisely drilled holes too. SMD is a godsend for the homebrewer. It
> : is much easier than working with leaded parts.
>
> Come on, Gary. 'Fess up. How do you replace a 120 lead qfp ic?
> I think SMD is a horror for anyone who wants to service a circuit
> board. You might be able to replace a resistor, but servicing
> any active device beyond a simple transistor is damn near impossible.

Try a good heat gun and make an air director out of bent metal around
the air output of the gun.  That and some small tools like dental picks
can work wonders with SMD devices.  The fancy air desoldering tools
that the production department are using at my work are not much more
than that. Yes, they do have some temp control, but just be careful
and things will work out OK.
--
Regards,
WA1RAJ
Carl D. Walker

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
                        Benjamin Franklin, 1759


From [e-mail] Sat Oct 19 10:10:42 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: 18 Oct 1996 16:37:14 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 48
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References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Carl D. Walker ([e-mail]) wrote:
: Thomas G. McWilliams wrote:
: >
: > Gary Coffman ([e-mail]) wrote:
: > : And the rise of SMD components has eliminated the need for lots of
: > : precisely drilled holes too. SMD is a godsend for the homebrewer. It
: > : is much easier than working with leaded parts.
: >
: > Come on, Gary. 'Fess up. How do you replace a 120 lead qfp ic?
: > I think SMD is a horror for anyone who wants to service a circuit
: > board. You might be able to replace a resistor, but servicing
: > any active device beyond a simple transistor is damn near impossible.

: Try a good heat gun and make an air director out of bent metal around
: the air output of the gun.  That and some small tools like dental picks
: can work wonders with SMD devices.  The fancy air desoldering tools
: that the production department are using at my work are not much more
: than that. Yes, they do have some temp control, but just be careful
: and things will work out OK.

My personal experience has been that it's difficult to work with pqfps
or other "fine pitch" parts with what I consider "hobby" tools.  But
Weller WTCP-type soldering stations are readily available at low prices
on the surplus market, and with that sort of soldering tool and a bench-
mounted magnifier/light, you can work with SOIC packs and resistors and
capacitors, certainly.  I've replaced pqfps with a Weller station, but
occasionally get solder bridges that my old eyes have a hard time
seeing; it isn't necessarily easy to get rid of such bridges as I've
found from working under a stereo microscope -- then at least they are
easier to see.  To remove the old, you can cut leads and remove them
one-by-one, heat the whole package and remove it all at once (not
recommended without practicing on a board you don't care about), or melt
the solder and pry up the lead, lead-by-lead.  Clean the pads with
solderwick, carefully position the new IC and tack leads at opposite
corners, carefully check the position, and solder.  No, 12-gauge solder
and a 200 watt American Beauty aren't going to do the trick...

I do agree with Gary that making an SMT board, at least for anything
down to 0805 R's and C's and 0.05" lead pitch ICs, is easier than doing
the same circuit with thru-hole parts (thur hole board).  For the most
part, I don't have any reason to use fine-pitch parts in my homebrew
designs anyway, except for a very few special things (perhaps like the
latest family of Analog Devices DDS chips).

--
Cheers,
Tom
[e-mail]


From [e-mail] Sat Oct 19 10:10:43 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!bluto.accesscomm.net!usenet
From: [e-mail] (George Carlson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: Fri, 18 Oct 1996 13:04:29 GMT
Organization: Access Communications, Inc. ( Houston, TX )
Lines: 13
Message-ID: <5480o5$[e-mail]>
References: <53jdt3$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

Yesterday, I asked the President of our Ham Club if he thought it
would be a good idea for me to do a presentation on how PCB's are
fabricated.  I've been an EE Design Engineer for over twenty years and
have had quite a bit of experience in this area, both professional and
hobby.  He said he thought the subject would be to technical for our
club.  I guess we will just have to sit there and listen to more
bellowing about 15 second DX QSO's.
It seems we've all become Amateur Radio Operators, not Radio Amateurs.

George Carlson   KC5RCC
Geotek Design Services
[e-mail]



From [e-mail] Sat Oct 19 10:10:45 1996
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From: [e-mail] (Mark Little)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: re: is equipment building and repair a lost art? your comments, please.
Date: 19 Oct 96 07:53:45
Organization: Microtronics Information Systems
Lines: 37
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References: <53kcf6$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:20301 rec.radio.amateur.misc:116712


>
>
> I think the Amateur Community is not as " tuned into " electronics as it onc
e
> was.  With the actual queations and answers presented there is no need to le
arn
> Ohms or Kirchoffs law  How many can calculate the gain to a common emmiter
> amplifier circuit.  You do not learn that by reading a Q & A Manual.
>  I used the ARRL License manuals in the early 1970s. It was basically a syli
bus
> (sp) of what one needed to know to pass the exam.  Then you " hit the books
"
> for the answers.  Now you just memorize the answers to the questions.  Sure
> some knowledge has to soak in, but the majority appears to be forgotton once

>  " you passed  "  is heard .  I happen to be in the business and the kinds o
f
> questions I receive have really changed over the 7 years I've been involved.
> Now I speand most of my time merely reading the manual verbatium to the call
er
> who appears to be willing to pay long distance charges to be read to.  Not
> complaining,  the customer needs and abilities have changed over the years.
>  I have chatted with EE degreed  Extra class license holders who could not c
ut
> a dipole antenna which I found amazing but true none the less.
> I do agree the need for club projects, how about showing some club members h
ow
> to photo etch a circuit board, or what positive feedback really does, build
an
> antenna tuner or SWR meter Building is great fun.  It's up to the builders o
f
> the community to give a hand and show the new comers what they are missing
>
> Gary
>
> .

This is not unique to "new" amateurs. The other day at the radio club I repair
ed
a radio for a full call (has had a licence for 30+ years). The fault was a sim
ple
mechanical mis-alignment of the PTT plunger onto the switch. This same amateur
needed help to determine that the lead fromn the battery charger has a break i
n
it.

Mind you, he is a good operator
Mark.




From [e-mail] Sat Oct 19 10:10:46 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!ix.netcom.com!news
From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Date: 19 Oct 1996 00:35:14 GMT
Organization: Netcom
Lines: 17
Message-ID: <5497o2$[e-mail]>
References: <[e-mail]> <548bnq$[e-mail]>
NNTP-Posting-Host: pax-ca4-03.ix.netcom.com
X-NETCOM-Date: Fri Oct 18  5:35:14 PM PDT 1996

In <548bnq$[e-mail]> [e-mail] (Tom Bruhns) writes:

>...  For the most
>part, I don't have any reason to use fine-pitch parts in my homebrew
>designs anyway, except for a very few special things (perhaps like the
>latest family of Analog Devices DDS chips).
>

Speaking of which, I just received a couple of samples of the AD 9850
DDS chip.  Does anyone make any prototyping boards with surface-mount
component landings on them?   Hmmm, maybe if I find some bare PCB's
with the appropriate surface-mount component landings, I can just cut
them out of the board and glue them to a piece of copper-clad.  Then
solder the device to this piece of board and jumper wires to the rest
of the circuitry (dead-bug or whatever).

- Jeff, WA6AHL


From [e-mail] Sat Oct 19 10:10:47 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-ana-7.sprintlink.net!cs.utexas.edu!howland.erols.net!EU.net!newsfeed.internetmci.com!news.io.com!news.fc.net!paranoia.com!filipg
From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Date: 18 Oct 1996 02:03:35 GMT
Organization: TLJ Consulting
Lines: 31
Sender: [e-mail]
Message-ID: <546ohn$[e-mail]>
References: <53f8km$[e-mail]> <53gtvv$[e-mail]> <[e-mail]>
NNTP-Posting-Host: primus.paranoia.com
Summary: yeah, kinda...
Xref: news1.epix.net rec.radio.amateur.homebrew:20309 rec.radio.amateur.misc:116720

In Article <[e-mail]>, through puissant locution,
 [e-mail] (Gary Coffman) soliloquized:
>Many of today's radios have gone to surface mount parts, and that
>makes repair a lot easier. You only need to be able to get to one
>side of a circuit board, so you often don't have to disassemble
>the radio very far in order to replace the bad part. SMD has made
>the repairman's job much easier.

Greetings. The topic has been lost here... "repairman" not the same
as "equipment building and repair"... All you needed back then
was a roll of solder, some flux, and a 60Watter... compare this
to the $500+ Pace SMD rework station... Yes, a repairman IS
equipped to repair and maybe even "homebrew" with SMD... but the
average Joe "Ham" Sixpack is certainly not.

I can easily repair a DIP-based device... a $15 desoldering iron
from RatShack and some experience gives me perfect unsolders 99%
of the time... but I can not afford an SMD station.

Not that I don't improvise... I snip the legs off the SMD device
with a Dremel and glue down the new device on top of the old and
solder in 30ga wires from the old pads to the new.. or use a
DIP... or just toss it.

[sorry, pet peeve]

Take care.
--
+-->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] Sat Oct 19 10:10:48 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!netnews.fast.net!news.fast.net!netaxs.com!netnews.com!howland.erols.net!swrinde!cssun.mathcs.emory.edu!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <53f8km$[e-mail]> <53gtvv$[e-mail]> <[e-mail]> <546ohn$[e-mail]>
Date: Sat, 19 Oct 1996 03:12:29 GMT
Lines: 47
Xref: news1.epix.net rec.radio.amateur.homebrew:20311 rec.radio.amateur.misc:116723

In article <546ohn$[e-mail]> [e-mail] (Filip M Gieszczykiew
icz) writes:
>In Article <[e-mail]>, through puissant locution
, [e-mail] (Gary Coffman) soliloquized:
>>Many of today's radios have gone to surface mount parts, and that
>>makes repair a lot easier. You only need to be able to get to one
>>side of a circuit board, so you often don't have to disassemble
>>the radio very far in order to replace the bad part. SMD has made
>>the repairman's job much easier.
>
>Greetings. The topic has been lost here... "repairman" not the same
>as "equipment building and repair"... All you needed back then
>was a roll of solder, some flux, and a 60Watter... compare this
>to the $500+ Pace SMD rework station... Yes, a repairman IS
>equipped to repair and maybe even "homebrew" with SMD... but the
>average Joe "Ham" Sixpack is certainly not.
>
>I can easily repair a DIP-based device... a $15 desoldering iron
>from RatShack and some experience gives me perfect unsolders 99%
>of the time... but I can not afford an SMD station.

You appear to have a mistaken impression that SMD work requires
an expensive SMD rework station. In fact it does not. All you
really need is a source of static hot air and a few inexpensive
tools and supplies. A Weller Pyropen Jr is an inexpensive and
convienent source of static hot air. Add tweezers, toothpicks,
small bottles of solder paste and flux, a bit of solderwick, a
bit of modeling clay, and a jeweler's loupe, and you have a
complete SMD rework station that'll fit in a coat pocket and
will work in places where you can't even find an outlet to plug
in your soldering iron.

>Not that I don't improvise... I snip the legs off the SMD device
>with a Dremel and glue down the new device on top of the old and
>solder in 30ga wires from the old pads to the new.. or use a
>DIP... or just toss it.

Yuck! What an ugly technique. Why not just properly remove the
SMD device and replace it with a new one? It isn't hard to do
the repair correctly. You've just got to get over the one pin
at a time fixation soldering irons tend to promote.

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 Oct 19 10:10:49 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!newsfeed.internetmci.com!newsrelay.courtave.net!news.inetnebr.com!news.mid.net!wormer.fn.net![e-mail]
From: John Benedict <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: kit building
Date: Wed, 16 Oct 1996 14:28:51 -0500
Organization: Feist Connections
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: fsa131.fn.net
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looking for any kits that can be purchased regarding 10 meter and
above. reply to mail [e-mail]


From [e-mail] Sat Oct 19 10:10:51 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (G4YNM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Longwave Amateur Band
Date: 11 Oct 1996 11:00:16 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <53lne0$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, "L. Booth" <[e-mail]> writes:

>> I heard that there's a longwave amateur band somewhere around 100 kHz
or
>> 200 kHz for experimenters.

It's on 73kHz in Great Britain. But I can't recall the fuller details
(mostly 'coz I'm not interested in that particular band).

Ben


From [e-mail] Sat Oct 19 10:10:52 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Longwave Amateur Band
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]> <53dbcb$[e-mail]> <[e-mail]> <[e-mail]>
Date: Sun, 13 Oct 1996 19:43:00 GMT
Lines: 16

In article <[e-mail]> John Rabson <word.factory@zetnet
.co.uk> writes:
>The UK LF band is 73 kHz +/- 1.4kHz, with erp 1 W max. All modes
>except FSTV. No /M or /MM! See

One watt ERP! Man, wish we could do high power stuff like that!
We're limited to one watt *input*, and given the limits on antennas,
the ERP is better expressed in microwatts, or at best as a few
milliwatts. An extra 30 db of signal would make things lots
easier.

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 Oct 19 10:10:53 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!nntp.inet.fi!news.icl.fi!newsmaster
From: Olli Tuppurainen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Marconi crystal filter info needed
Date: Mon, 14 Oct 1996 20:41:57 +0200
Organization: ICL, Finland
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: fin17_ras2.icl.fi
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; I)

Does anyone in this forum have any data of

Marconi crystal filter
Made in U.K
type number FQQ00-2025-01

Thanks


Olli/OH2KVH
[e-mail]


From [e-mail] Sat Oct 19 10:10:53 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!news.ais.net!usenet
From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola PLL Chip Source
Date: 13 Oct 1996 18:09:44 GMT
Organization: American Information Systems, Inc.
Lines: 25
Message-ID: <53rb98$[e-mail]>
References: <53qflc$[e-mail]>
Reply-To: [e-mail] (Carl Stevenson)
NNTP-Posting-Host: ts01-22.dialup.ais.net
X-Newsreader: IBM NewsReader/2 v1.2.5

In <53qflc$[e-mail]>, [e-mail] (David R. Bowie) writes:
>Hi Anyone know of a mail order source for the Motorola range of Synthesiser
>chips 14515x. These are hard to get in New Zealand. Many thanks,
> Dave Bowie ZL4DRB


Do a web search for some of the major distributors ...

penstock
future electronics inc. (FEI)
hamilton avnet
halmark

you should be able to turn up something.

Also, try

digikey
mouser

73,
Carl - wa6vse
[e-mail]




From [e-mail] Sat Oct 19 10:10:54 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!tir.com!news
From: "Bill C." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola PLL Chip Source
Date: Sun, 13 Oct 1996 20:44:16 -0700
Organization: The Internet Ramp
Lines: 11
Message-ID: <[e-mail]>
References: <53qflc$[e-mail]>
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Hi Dave,

Tyr here:

http://www.digikey.com/

     73,

     Bill   KU8H




From [e-mail] Sat Oct 19 10:10:55 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!munnari.OZ.AU!metro!metro!asstdc.scgt.oz.au!nsw.news.telstra.net!ihug.co.nz!Chaos.es.co.nz!Default
From: [e-mail] (David R. Bowie)
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorola PLL Chip Source
Date: Sun, 13 Oct 96 11:15:22 GMT
Organization: Efficient Software Internet Service
Lines: 3
Message-ID: <53qflc$[e-mail]>
NNTP-Posting-Host: port47-athene.es.co.nz
X-Newsreader: News Xpress Version 1.0 Beta #4

Hi Anyone know of a mail order source for the Motorola range of Synthesiser
chips 14515x. These are hard to get in New Zealand. Many thanks,
 Dave Bowie ZL4DRB


From [e-mail] Sat Oct 19 10:10:56 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!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!ddwyer.demon.co.uk!ddwyer
From: Douglas Dwyer <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola PLL Chip Source
Date: Tue, 15 Oct 1996 09:26:38 +0100
Organization: fp
Lines: 25
Distribution: world
Message-ID: <[e-mail]>
References: <53qflc$[e-mail]> <[e-mail]>
 <53ufc6$[e-mail]>
NNTP-Posting-Host: ddwyer.demon.co.uk
X-NNTP-Posting-Host: ddwyer.demon.co.uk
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X-Newsreader: Turnpike Version 1.12 <iq8rvUYxwmrVWYgB1Esp4Q5R$P>

In article <53ufc6$[e-mail]>, Dana Myers
<[e-mail]> writes
>In article <[e-mail]>, Bill C. <[e-mail]> wrote:
>>Hi Dave,
>>
>>Tyr here:
>>
>>http://www.digikey.com/
>
>When did Digi-Key start selling Motorola parts?  I've found that
>Mouser and Digi-Key are not good source for things like Motorola
>PLLs (like the MC145157, MC145170, MC14519x, etc.).  They don't
>sell Motorola, and they don't stock too many 'exotic' chips from
>the vendors they do sell.
>
>I've bought Motorola PLLs from Hamilton Halmark, Wyle and (I think)
>Newark.
Newark is now part of Farnell UK/US I recently purchased Motorola PLL
ICs from the Newark stock in the UI from Farnell in the UK. 4 Days
delivery quoted.
Douglas Dwyer FP Ltd Shorts Farm Northlew Okehampton Devon EX20 3NR UK
Tel[phone]
Stop by http://ourworld.compuserve.com/homepages/Frequency_Precision/  for
information on Precision Frequency, Crystals OCKOs TCXOs and
more.


From [e-mail] Sat Oct 19 10:10:57 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Motorola PLL Chip Source
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <53qflc$[e-mail]> <[e-mail]> <53ufc6$[e-mail]>
Date: Tue, 15 Oct 1996 16:41:53 GMT
Lines: 15
Sender: [e-mail]

in <53ufc6$[e-mail]>, Dana Myers wrote:
: In article <[e-mail]>, Bill C. <[e-mail]> wrote:
: >Hi Dave,
: >Tyr here:
: >http://www.digikey.com/

: When did Digi-Key start selling Motorola parts?  ...

: I've bought Motorola PLLs from Hamilton Halmark, Wyle and (I think)
: Newark.

Also try Active/Future.

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



From [e-mail] Sat Oct 19 10:10:58 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!newsfeed.concentric.net!news-master!not-for-mail
From: [e-mail] (Insight Insight)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need : SWR Schematics
Date: 16 Oct 1996 16:11:11 GMT
Organization: Concentric Internet Services
Lines: 4
Message-ID: <5431ev$[e-mail]>
NNTP-Posting-Host: mariner.cris.com
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]

I am looking for info on building an swr that would be suitable for Fm
radio frequencies. Thanks.

Insight


From [e-mail] Sat Oct 19 10:10:58 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!uunet!news-in2.uu.net!nwlink.com!zommbee
From: [e-mail] (Gordon Gekko)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need schematic for 6L6 or 6V6 homebrew transmitter
Date: 12 Oct 1996 20:51:44 GMT
Organization: None
Lines: 22
Message-ID: <53p0d0$[e-mail]>
NNTP-Posting-Host: port42.usr2.nwlink.com
X-Newsreader: News Xpress Version 1.0 Beta #4



Maybe someone out there can help me out.  I once built a 6L6 transmitter
(single tube) for 40 meters and had a ball with it.  I'd like to do it
again, but I can't put my hands on the schematic.  Since I have a number
of 6L6 and 6V6 tubes, I want to use one of those (realizing, of course,
there is a power difference between the two).  I believe the one I built
even had a PI tank output for a 50 ohm antenna.  Any low power (5 to
25 watts) rig for 40meters or higher that can tune a 50 ohm load would
be perfect.  I have alot of my old novice Xtals plus a VFO to boot.

If you have an old QST, 73, or CQ article with such a project, maybe I
could get you to fax it to me??  Or maybe scan it and email it if possible??

Please email if you can help.



Thanks


Gordon


From [e-mail] Sat Oct 19 10:10:59 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!uwm.edu!homer.alpha.net!usenet
From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need schematic Hamtronics XV2, XV4, CA144-28, CC432-5
Date: Thu, 17 Oct 1996 11:09:42 -0700
Organization: Aero Head Aviation
Lines: 11
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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X-Mailer: Mozilla 2.0 (Win16; U)

Hi...I need schematics for the following Hamtronics kits:
XV2-x (any XV2 model) VHF Transverter
XV4-5 UHF Transverter
CA144-28 VHF Receive Converter
CC432-5 UHF Receive Converter
Thanks...Scott, N0EDV.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 19 10:11:00 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!uwm.edu!homer.alpha.net!usenet
From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Schematic, Hamtronics XV2-x, XV4-5, CA146-28 and cc432-5
Date: Wed, 16 Oct 1996 23:18:00 -0700
Organization: Aero Head Aviation
Lines: 12
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; U)

I need the schematics for the following Hamtronics kits:
XV2-x (any XV2 model) 2M transverter
XV4-5 435-437 Transverter
CA146-28 2M Rcv Converter
CC432-5 435-437 Rcv Converter
If possible, FAX to 608-634-2594 or digitize and e-mail.
Thanks, Scott, N0EDV.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 19 10:11:01 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!netnews.worldnet.att.net!cbgw2.lucent.com!nntphub.cb.lucent.com!ssbunews.ih.lucent.com!news
From: "Frank W. van Wensveen" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.shortwave,rec.radio.amateur.homebrew
Subject: Need technical info on FRG-7
Date: Fri, 11 Oct 1996 10:40:27 +0200
Organization: Lucent Technologies Netherlands [CONTRACTOR]
Lines: 39
Message-ID: <[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.equipment:40580 rec.radio.shortwave:86586 rec.radio.amateur.homebrew:20131

*** Please reply through Email as well - thanks ***

Yesterday I bought a Sommerkamp FRG-7 at an auction. The Sommerkamp
FRG-7 is AFAIK identical to the Yaesu FRG-7, and a colleague of mine
told me that if you peel off the Sommerkamp label, there's a Yaesu label
right underneath, so that should be no problem. :-)

My new FRG-7 looked fine, but when I tried it at home I discovered that
the PLL won't lock. As far as I know, the FRG-7 has a 1 MHz XO, and a
tuning knob that controls a VFO, which is then phase-locked with  the 1
MHz XO signal, to get multiples of 1 MHz (1, 2, 3 ... 29 MHz).

The red 'Lock' LED on my FRG-7 is always on. The PLL won't lock, I don't
get a stable multiple of 1 MHz but instead the 'multiple MHz' VFO acts
as a free-running oscillator.

I don't have much experience with the FRG-7, but years ago we had one
(the Yaesu version) at the Hydromechanics Lab at Delft Polytechnical
University, and I remember that the red 'Lock' led used to go off when
the PLL was locked. Do I remember this correctly? If not, what is the
correct procedure to tune a FRG-7? Does the PLL also lock (I think it
should) if no antenna (or only a short piece of wire) is connected?

What's the idea with the small button at the right side of the tuning
scale (marked 'Tune' and 'Set' if I remember correctly, I don't have the
receiver here at the office right now)?

I am especially looking for (copies of) the owners manual and service
manual (esp. the circuit diagram) of the FRG-7. Preferably from someone
living in the Netherlands. :-)

*** Please reply through Email as well - I can't read the newsgroups
often. ***
Any reply greatly appreciated!!

--


73, Frank PA3GMP


From [e-mail] Sat Oct 19 10:11:02 1996
Newsgroups: rec.radio.amateur.equipment,rec.radio.shortwave,rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!munnari.OZ.AU!news.mel.connect.com.au!news.syd.connect.com.au!news.ci.com.au!fgh!dave
From: [e-mail] (Dave Horsfall)
Subject: Re: Need technical info on FRG-7
X-Witty-Saying: "Klein Bottle - open other end"
Message-ID: <[e-mail]>
X-Disclaimer: "Me, speak for us?"
Organization: FGH Decision Support Systems
References: <[e-mail]> <53ur6p$[e-mail]>
Date: Wed, 16 Oct 1996 02:41:37 GMT
Lines: 12
Xref: news1.epix.net rec.radio.amateur.equipment:40736 rec.radio.shortwave:86756 rec.radio.amateur.homebrew:20205

In article <53ur6p$[e-mail]>,
    Ed Smith <[e-mail]> writes:

| I own and use a Yaesu FRG-7 receiver.  You do recall correctly, the lock
| light goes out when the PLL is in lock.  I always thought this was sort of
| peculiar.

It's done that way to save on battery power.

--
Dave Horsfall VK2KFU  [e-mail]  Ph: [phone]  Fx: [phone]
FGH Decision Support Systems P/L, 77 Pacific Hwy, Nth. Sydney, 2060, Australia


From [e-mail] Sat Oct 19 10:11:03 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!demos!news1.relcom.ru!EU.net!newsfeed.internetmci.com!news1.mnsinc.com!usenet
From: [e-mail] (Bry)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: New Newsgroup
Date: Fri, 18 Oct 1996 19:01:57 GMT
Organization: MEGALIST www.mnsinc.com/bry/
Lines: 13
Distribution: inet
Message-ID: <548uk3$[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:20300 rec.radio.amateur.misc:116711

Does anyone know if the new newsgroup:
rec.radio.amateur.boatanchors
has got started yet?

E-mail me!

Bry, AF4K

[e-mail]
Tagline: Obligatory witticism or other comment at end of a message.
Why do we like to do these things? To relieve stress of course!




From [e-mail] Sat Oct 19 10:11:04 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!uunet!news-in2.uu.net!news.cyberg8t.com!host52.cyberg8t.com!user
From: [e-mail] (Raymond Sarrio)
Newsgroups: rec.radio.amateur.homebrew
Subject: New online survey asks--->Why aren't you an ARRL member?
Date: Fri, 18 Oct 1996 15:47:28 -0700
Organization: Raymond Sarrio Co.
Lines: 27
Message-ID: <[e-mail]>
NNTP-Posting-Host: host52.cyberg8t.com


The ham Poll at (www.sarrio.com) shown below asks a new question for the
month of October:

Why Have You Not Chosen To Join The ARRL?

Less than 1/3 of all ham radio operators are members of the ARRL. The
question for this month is
directed to those of you who are not members.

From the list of possible reasons below, select the reason that best
describes why you have not chosen the join the ARRL.

Results as of Oct. 16,1996

The most results as ofhe dues are too high. |************ 12
Their Ham policy positions are not close to mine.|****** 6
They are too closely tied to ham commercial interests. | 0
I was not treated well by one of their representatives.|* 1
I just haven't gotten around to it.                    |******** 8

Total votes displayed: 27
--
The Raymond Sarrio Co. a full feature Ham Radio Storefront and web site develo
per. Located at http://www.sarrio.com.

In association with Brillar Enterprises http://win-win.com/brillar provider of
 discount CD-Roms!



From [e-mail] Sat Oct 19 10:11:06 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!news1.mnsinc.com!usenet
From: [e-mail] (Bry)
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew
Subject: Parts needed (Tubular!)
Date: Fri, 18 Oct 1996 19:01:55 GMT
Organization: MEGALIST www.mnsinc.com/bry/
Lines: 74
Distribution: inet
Message-ID: <548uk2$[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.swap:91654 rec.radio.amateur.homebrew:20296

My LIST of parts needed for building a tube xmtr:

1) CHassis - preferably 9 X 12 X 4" with base cover.

2) Matching box - sure, no problem, he he!

3) Tubes:

807
1625
12BY7
6146
6L6
6AQ5A
6CL6
OD3
OC3

4) Tube sockets: for all of the above tubes.

5) Transmitting Variable capacitors, low to medium power level:
     30 pF (or 47 pF) trimmer
    100 pF
    150 pF
    200 pF
    365 pF

6) 2.5 mH RF Chokes 100 mA or 250 mA preferred.

7) Capacitors:
20 pF mica
22 pF mica
100 pF mica
180 pF mica
220 pF mica
270 pF mica
470 pF mica
.001 uF  at 600 V and at 2000 V or at 1000 V
.005 uF  at 600 V and at 1000 V
.01uF at 200 V and 600 V or 1000 V
.05uF  at 1000 V or more

8) Resistors:
5 K  10 watts
22 K  1 watt or 2 watt
10 ohm  1 watt
330K  2 watt (need QTY 4-8)
27 K  1/2 watt or 1 watt
100 K  1/2 watt or  1 watt
47 ohm  1 watt
470 ohm  1/2  watt or  1 watt
220 k ohm 1/2 watt
2 K  or 2.2 K  1 watt

9) Meter - prefer medium size 0-100 mA

10) FT-243 crystals

1805 - 1850 kHz
3515 - 3550 kHz
7010 - 7050 kHz

I only need xtals in THE ABOVE frequency ranges. Thanks.

Please call [phone] or e-mail to:
[e-mail]

Radio AF4K
Brian Carling

Tagline: Obligatory witticism or other comment at end of a message.
Why do we like to do these things? To relieve stress of course!




From [e-mail] Sat Oct 19 10:11:06 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!EU.net!sun4nl!uva.nl!amc!news
From: Ruud de Boo <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: PinLayout TBA570A ???
Date: Fri, 18 Oct 1996 08:57:47 -0700
Organization: Academic Medical Center, Amsterdam
Lines: 18
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: amciv3.amc.uva.nl
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
X-Mailer: Mozilla 3.0Gold (Win16; I)

Hi,

Can anyone describe the pin layout of this chip ???
Answers by mail:
mailto://[e-mail],
Or to Richard
mailto://[e-mail]

Thanx
-- =

Ruud de Boo
Academic Medical Centre, Amsterdam
A.D.I.V. Cluster Divisies
[phone]
[e-mail]
Kn=F8tslings at  http://huizen.dds.nl/~r_deboo
Arcana info at http://www.xs4all.nl/~cmr/arcana.html


From [e-mail] Sat Oct 19 10:11:07 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!newsfeed.internetmci.com!ncar!stout.atd.ucar.edu!owens
From: [e-mail] (Chip Owens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Plate Modulation with the 3-500Z
Date: 15 Oct 1996 21:11:02 GMT
Organization: NCAR
Lines: 8
Distribution: usa
Message-ID: <540ul6$[e-mail]>
NNTP-Posting-Host: stout.atd.ucar.edu

Has anyone operated a 3-500Z triode in Class C plate-modulated service?
If so, I'd appreciate hearing from you.

Thanks!
Chip Owens, NW0O

--
Chip Owens NW0O,  ([e-mail])


From [e-mail] Sat Oct 19 10:11:08 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!hunter.premier.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: 16 Oct 1996 08:56:39 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <542m27$[e-mail]>
References: <540ul6$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <540ul6$[e-mail]>, [e-mail] (Chip
Owens) writes:

>
>Has anyone operated a 3-500Z triode in Class C plate-modulated service?
>If so, I'd appreciate hearing from you.
>
>Thanks!
>Chip Owens, NW0O

Has to be neutralized and grid driven Chip, or else you need to modulate
the driver also.

You have to run the tube way in cutoff, so the conduction angle is short.
Peak anode voltage is about 5000 volts maximum, that's RF plus audio.
Above that and you'll have a lot of tubes that might arc on occasion.

They will work, but a low mu triode or tetrode is much more linear when
polate modulated and easier to adjust.

73 Tom


From [e-mail] Sat Oct 19 10:11:09 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news-stock.gsl.net!news.gsl.net!news-penn.gsl.net!news.gsl.net!news-stkh.gsl.net!news.gsl.net!news-peer.gsl.net!news.gsl.net!hunter.premier.net!feed1.news.erols.com!uunet!in1.uu.net!news-in.iadfw.net!usenet
From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: Wed, 16 Oct 1996 08:57:34 -0500 (CDT)
Organization: INTERNET AMERICA
Lines: 24
Message-ID: <542pki$[e-mail]>
References: <540ul6$[e-mail]> <542m27$[e-mail]>
NNTP-Posting-Host: dal23-11.ppp.iadfw.net
X-Newsreader: Forte Free Agent v0.38

[e-mail] (W8JI  Tom) wrote:

>Has to be neutralized and grid driven Chip, or else you need to modulate
>the driver also.

The Continental Electronics 314R-1 1 KW AM transmitter used a pair of
3-500Z's in plate modulated service.  (An another as the 9 KV
Switching Modulator tube.)  Broadband neutralization was accomplished
by an untuned split-secondary grid-coupling transformer.  Grid swaming
and grid-leak bias were provided by the same wire-wound non-inductive
resistor.

> a low mu triode or tetrode is much more linear

The 3-500Z modulates quite nicely; typical distortion was under 1/2%.
And no screen modulation to worry with.


FRED

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



From [e-mail] Sat Oct 19 10:11:10 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!cs.utexas.edu!swrinde!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: 16 Oct 1996 20:33:41 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 44
Sender: [e-mail]
Message-ID: <543ut5$[e-mail]>
References: <542pki$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Fred,
In article <542pki$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>
>The Continental Electronics 314R-1 1 KW AM transmitter used a pair of
>3-500Z's in plate modulated service.  (An another as the 9 KV
>Switching Modulator tube.)  Broadband neutralization was accomplished
>by an untuned split-secondary grid-coupling transformer.  Grid swaming
>and grid-leak bias were provided by the same wire-wound non-inductive
>resistor.

Was that a PWM modulated rig? Or a conventional AM. And how much HV and
bias did they use?

> a low mu triode or tetrode is much more linear
>
>The 3-500Z modulates quite nicely; typical distortion was under 1/2%.
>And no screen modulation to worry with.

The only PA that "modulates quite nicely" on AM is one that has the grid
biased well into cutoff, and is driven into and out of plate current with
very fast switching times.

That's why low or medium mu triodes are best, and they and tetrodes are
operated well into class C when plate modulated. The requirement for low
distortion linear modulation is a very non-linear RF conduction angle,
because the tube has to follow square law power output power vs plate
voltage traits. In other words, it has to be a good mixer rather than a
linear amplifier.

As to using 3-500Z's at higher peak voltages, you'd better buy tubes with
special testing. Last I heard, they were only hi-potting them to 8 kV.
Unless you like to have tubes flash over I'd stay away from plate
modulated voltages of over 3000 volts dc, because that would run the anode
up to 6 kV with perfect coupling to the antenna. Loose or lighten the
load, and high voltage could go much higher.

With the number of 3-500Z's I see flash over at 3600 volts dc anode
voltage I'd sure not I'd even want to plate modulate (in a conventional
system) them at that voltage. Especially in amateur service, where the
tube cools off and sits dead for extended periods of time.

73 Tom


From [e-mail] Sat Oct 19 10:11:11 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!netnews.worldnet.att.net!uunet!news-in2.uu.net!news-in.iadfw.net!usenet
From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: Fri, 18 Oct 1996 23:43:49 GMT
Organization: INTERNET AMERICA
Lines: 45
Message-ID: <5494nl$[e-mail]>
References: <546me6$[e-mail]> <5474cs$[e-mail]>
NNTP-Posting-Host: dal01-16.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (W8JI  Tom) wrote:

> I used  3 rd and 5 th harmonic resonators

In every analysis I've done--or seen done--the addition of the 5 th
harmonic resonator is a waste.  The increase in efficiency is
generally one percent or less.  And the increased circuit losses and
circuit complexity offset (cost) eliminate any savings.

>As a matter of fact, one commercial PA with a 3-500Z driver was suffering
>chronic gasiing failures, the driver had to be replaced with a lower
>dissipation tube that showed a slight anode color, and the problem went
>away.

>You can call Chazen

I'll check in with him.  It's so implausible that it might be true.

>I have a few AM rigs...because I buy things I don't need, and
>like to play with stuff that was around when I was young hood...I mean
>novice.

Well, that's cool; I understand it.  But I was thinking about
commercial AM and HF broadcasters when making my disparaging words
about the use of AM.  I mean, really!  You could make a case for the
diode detector in the 60's cuz it wuz real 'spensive.  But it wasn't
in the 70's.  Look, we fight sales battles every damn day over the
efficiency of transmitters.  We've lost sales because one transmitter
was a little more efficient that the one we were offering.  But the
broadcaster who is trying to buy the transmitter with the highest
conversion efficiency is buying a transmitter for one of the least
efficient communications methods know to mankind.  How does AM survive
as a medium of transmission.  It just don't make no kind of sense to
me.  It ain't fidelity.  It ain't spectrum efficiency.  It ain't noise
immunity.  The only thing is about a dollar less cost in the receiver.
Somedays I feel like we're still building buggy whips; nice buggy
whips, but still buggy whips.


Fred

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



From [e-mail] Sat Oct 19 10:11:13 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: 19 Oct 1996 06:27:52 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 31
Sender: [e-mail]
Message-ID: <54aaf8$[e-mail]>
References: <5494nl$[e-mail]>
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X-Newsreader: AOL Offline Reader

In article <5494nl$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>In every analysis I've done--or seen done--the addition of the 5 th
>harmonic resonator is a waste.  The increase in efficiency is
>generally one percent or less.  And the increased circuit losses and
>circuit complexity offset (cost) eliminate any savings.

It helped in the DX-100, although I can;t say how much without digging up
the paper work. The largest change was getting the bias up, second largest
a third harmonic resonator in the grid, and so on down the line. I wanted
to do 90% or so, but never quite made it.

Remember one thing Fred, when the layout is crap the most esoteric things
make a difference. Changing the impedance or length of a cable, or
relocating a component can sometimes make a large performance change. The
DX-100 is not particulary well laid out.

>I'll check in with him.  It's so implausible that it might be true.

Get some gettering info on the 3-500Z, it explain some of those cosmic
photon arcs. The 500Z absolutely getters via the anode coating, and the
material is only fully activated at a dull red color. You can run the
filament all week, and you won't de-gas the tube.

The worse thing in the world is to let a 3-500 sit around cold for months,
and then apply full anode voltage. I've sucessfully de-gassed em with
positive grid bias and low anode voltage, running the anode red at just
over 1.5 kV for a half hour or so.

73 Tom


From [e-mail] Sat Oct 19 10:11:14 1996
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From: Richard Hager <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Plate voltages, Eimac Tube Book
Date: Sun, 13 Oct 1996 14:05:08 -0400
Organization: Ah-ha! Design Group, Inc.
Lines: 24
Message-ID: <[e-mail]>
References: <536gk8$[e-mail]> <537840$[e-mail]> <[e-mail]>
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Robert Ganter wrote:
>
> [e-mail]@smtp-news2.ibm.net wrote:
> >
> >  maybe some local old timer may have the Eimac 'Care and Feeding of Power
> >  Grid Tubes'. It does a great job of explaining the whole deal with load l
ines,
> >  impedances, and all. They're not too tough to understand. Only the Gate 2
> >  Vanity Call operation is beyond comprehension. Cheers!
>
> Do they still sell this book (or booklet) ? I would be very interested.
> If it is not available anymore, could someone photocopy it?
> Robert HB9NBY--

Hello,  I too would like to get a photocopy of this book.  Please email.

        Richard Hager

+ Ah-ha! Design Group, Inc.           -
+ Precision CNC Technology, since 1991 -
+ 612-641-1797, Fax: [phone]       -
+ "I just like to build stuff" So...     -
+ for CNC info, don't email me, call      -
+ or email Ah-ha! directly.  Thanks!       -
+ www.gdic.com/ahha  email: [e-mail]   -


From [e-mail] Sat Oct 19 10:11:15 1996
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From: David Sipe <"[e-mail]"@calweb.com>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate voltages, Eimac Tube Book
Date: Mon, 14 Oct 1996 19:10:03 -0700
Organization: .
Lines: 26
Message-ID: <53uri9$[e-mail]>
References: <536gk8$[e-mail]> <537840$[e-mail]> <[e-mail]> <[e-mail]>
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Richard Hager wrote:
>
> Robert Ganter wrote:
> >
> > [e-mail]@smtp-news2.ibm.net wrote:
> > >
> > >  maybe some local old timer may have the Eimac 'Care and Feeding of Powe
r
> > >  Grid Tubes'. It does a great job of explaining the whole deal with load
 lines,

> > Do they still sell this book (or booklet) ? I would be very interested.

> Hello,  I too would like to get a photocopy of this book.  Please email.

A few weeks ago, I contacted Eimac's web page, http://www.eimac.com and
asked for one and they
sent it to me a few days later. So it is still in print. They didn't
charge me for it, but it had
a price tag on it, $6.95. The web page has an icon for a request form
where you can order a catalog,
which I did, and also a comment area where I asked about the book.  Lots
of good info in there, but
it's too many pages to photocopy.

--
73  David   KD6QFZ
[e-mail]


From [e-mail] Sat Oct 19 10:11:16 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.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: Power Supply as Battery Charger
Date: Tue, 15 Oct 1996 09:43:18 -0400
Organization: Bruce Municipal Telephone System
Lines: 29
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ns.primeline.net
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To: [e-mail]
In-Reply-To: <[e-mail]>

On Mon, 14 Oct 1996 [e-mail] wrote:


> Questions:
>
> How does a battery charger differ from a power supply?

Chargers have some form of current regulation,power supplies don't.
they also should also have some form of overcharge protection.

> Is there a way to modify the supply to be able to use it as a charger?

Put a current limiting resistor in series withe the battery. A good rule
of thumb is to chrge with 1/10th of the AH rating (IE: 7 AH= 700ma Charge
current.

> Any help would be greatly appreciated.
>
> Thanks,
>
> John, KB2YJH

There are a number of elecronic circuit archives on the net. Just punch
what you need into your favorite search engine.

Gary Tait , VE3VBF
Sorry for snipping messages,My newsserver won't allow less new lines
than old.



From [e-mail] Sat Oct 19 10:11:17 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.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: Power Supply as Battery Charger
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Wed, 16 Oct 1996 16:53:06 GMT
Lines: 46

In article <[e-mail]> [e-mail] writes:
>I tried to use my 13.8v / 3 amp regulated power supply to charge a 12v /
>7 amp/hr nicad.
>
>I let the battery charge for about three hours.  At this point, the
>current being drawn by the battery had dropped from about 2.4 amps to
>about 1.45amps and the voltage at the battery, without load, rose to
>about 13.1v.
>
>The following morning, I re-connected the supply to the battery and saw a
>small spark when attaching the positive alligator clip to the battery
>(with the supply off, of course).
>
>At that point the supply ceased to work.  Further investigation found two
>open transistors in the supply.

Heh, heh, bad move. Always make sure the supply is on before connecting
it to the battery. Otherwise the reverse current flow from the battery
will pop things, as you learned. (Better quality supplies have reverse
protection diodes, but lots of them don't.)

>Questions:
>
>How does a battery charger differ from a power supply?

Not much at all for a *lead acid* battery charger. Both the lead
acid charger and the power supply are constant voltage devices.
But a *NiCd* charger is a different animal. NiCds should be charged
with a *constant current*. And that requires a different sort of
regulator. You can damage a NiCd by charging it with a constant
voltage. It can even explode.

>Is there a way to modify the supply to be able to use it as a charger?

Probably. It depends on the particular supply design, of course.
You'll have to alter the regulator to be a constant current regulator
rather than a constant voltage regulator. That's often possible, but
of course the utility of the unit as a regular power supply will be
lost.

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 Oct 19 10:11:18 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.ais.net!usenet
From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,sci.electronics.misc,sci.electronics.components
Subject: Re: Q. Unusual RF component in 100 watt 2 to 30MHz wideband linear
Date: 11 Oct 1996 15:50:15 GMT
Organization: American Information Systems, Inc.
Lines: 45
Message-ID: <53lqbn$[e-mail]>
References: <53g96m$[e-mail]>
Reply-To: [e-mail] (Carl Stevenson)
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In <53g96m$[e-mail]>, [e-mail] (Winfield Hill) writes:
>Can you identify an 4-terminal component called a ACR Z0-28F and
>looking something like a RF power transistor?
>
>I just purchased two military 100 (200?) watt wideband linear
>"preamplifiers" (that's what they're labelled!) which seem to work
>fairly well.  They work so well they burned out my 40 watt attenuator,
>forcing me to bring out my BIG loads!  The amplifier uses a pair of
>MRF466 for the input and MRF429 for the output.  These are
>"gull-winged" RF transistors with a bottom that reminds me of a TO-66
>for transferring heat.
>
>Anyway, for my application (flipping atom spins in a condensed-matter
>trap) I'd like to reduce the 3rd harmonic distortion of the amplifier.
>The amplifier has an external input for biasing the transistors toward
>class A operation.  Each push-pull CE stage is base-biased with the
>above-mentioned unusual component, which has four terminals: the 1st
>one to ground, the 2nd to the two bases (bypassed with 22uF and via an
>rf isolating xfmr), the 3rd to a 200-ohm trimmer to the 4th terminal,
>which goes to the external connector for bias control.
>
>With 0V to the external input, the amplifier draws no current.
>Applying +5 to +12 volts to the external biasing input changes the
>total current from to 1 to 4 amps, for example (while taking 0.5A on
>the control input).  Although the unusual part is performing a "dc"
>function, it is manufactured as a high-performance RF part with 4 gull
>wings, just as the MRF466, and is bolted to the heat sink as well.
>
>What is this unusual part and how does it work?  Also, if I keep
>increasing the class A bias, at what point will I be in danger of
>thermal runaway and destruction?  The amplifier's heat sinking is
>massive.
>

It sounds like the "unusual device" is a bias stabilization and tracking
device ... CTC used to make one called a BYISTOR ... it's coupled
tightly to the heatsink so it tracks the junctions of the RF devices to
help prevent thermal runaway.  The 200 Ohm trimmer is clearly the means
of adjusting the "idle bias" of the class AB stages for the desired
quiescent current and linearity.

Carl - wa6vse
[e-mail]




From [e-mail] Sat Oct 19 10:11:19 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.ais.net!usenet
From: [e-mail]  (Carl Stevenson)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,sci.electronics.misc,sci.electronics.components
Subject: Re: Q. Unusual RF component in 100 watt 2 to 30MHz wideband linear
Date: 13 Oct 1996 01:40:47 GMT
Organization: American Information Systems, Inc.
Lines: 13
Message-ID: <53phav$[e-mail]>
References: <53g96m$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Carl Stevenson)
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In <[e-mail]>, Charles Wenzel <[e-mail]> writes:
>Could they be using another RF transistor at DC to generate a
>temperature-compensating bias?


The device the original poster described was a special device that was
specifically designed to provide a low impedance, temperature tracking
bias for class AB RF power amps ...

Carl - wa6vse
[e-mail]




From [e-mail] Sat Oct 19 10:11:20 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,sci.electronics.misc,sci.electronics.components
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From: [e-mail] (Rob Janssen)
Subject: Re: Q. Unusual RF component in 100 watt 2 to 30MHz wideband linear
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <53g96m$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:20180 rec.radio.amateur.equipment:40686 sci.electronics.misc:15969 sci.electronics.components:13217

In <53g96m$[e-mail]> [e-mail] (Winfield Hill) writes:

>Can you identify an 4-terminal component called a ACR Z0-28F and
>looking something like a RF power transistor?

>I just purchased two military 100 (200?) watt wideband linear
>"preamplifiers" (that's what they're labelled!) which seem to work
>fairly well.  They work so well they burned out my 40 watt attenuator,
>forcing me to bring out my BIG loads!  The amplifier uses a pair of
>MRF466 for the input and MRF429 for the output.  These are
>"gull-winged" RF transistors with a bottom that reminds me of a TO-66
>for transferring heat.

To get good intermod (and probably 3rd harmonic) performance from a
transistor amp, the bias source must have a very low impedance.
To prevent thermal problems, it must also be temperature compensated
to track the B-E junction voltage of the power transistor.

Probably your device is an IC that has been purpose-designed to perform
this function.
The Motorola "RF Semiconductors" databook has a couple of application
notes describing wideband power amplifiers using transistors, and you
can find bias circuits in there that probably are roughly the same as
what can be found inside those devices.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Sat Oct 19 10:11:21 1996
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From: Brian Kline <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,sci.electronics.misc,sci.electronics.components
Subject: Re: Q. Unusual RF component in 100 watt 2 to 30MHz wideband linear
Date: Wed, 09 Oct 1996 20:53:34 -0700
Organization: Hybrid Networks, Inc.
Lines: 65
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References: <53g96m$[e-mail]>
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Winfield Hill wrote:
>
> Can you identify an 4-terminal component called a ACR Z0-28F and
> looking something like a RF power transistor?
>
> I just purchased two military 100 (200?) watt wideband linear
> "preamplifiers" (that's what they're labelled!) which seem to work
> fairly well.  They work so well they burned out my 40 watt attenuator,
> forcing me to bring out my BIG loads!  The amplifier uses a pair of
> MRF466 for the input and MRF429 for the output.  These are
> "gull-winged" RF transistors with a bottom that reminds me of a TO-66
> for transferring heat.
>
> Anyway, for my application (flipping atom spins in a condensed-matter
> trap) I'd like to reduce the 3rd harmonic distortion of the amplifier.
> The amplifier has an external input for biasing the transistors toward
> class A operation.  Each push-pull CE stage is base-biased with the
> above-mentioned unusual component, which has four terminals: the 1st
> one to ground, the 2nd to the two bases (bypassed with 22uF and via an
> rf isolating xfmr), the 3rd to a 200-ohm trimmer to the 4th terminal,
> which goes to the external connector for bias control.
>
> With 0V to the external input, the amplifier draws no current.
> Applying +5 to +12 volts to the external biasing input changes the
> total current from to 1 to 4 amps, for example (while taking 0.5A on
> the control input).  Although the unusual part is performing a "dc"
> function, it is manufactured as a high-performance RF part with 4 gull
> wings, just as the MRF466, and is bolted to the heat sink as well.
>
> What is this unusual part and how does it work?  Also, if I keep
> increasing the class A bias, at what point will I be in danger of
> thermal runaway and destruction?  The amplifier's heat sinking is
> massive.
>
> --
> Winfield Hill    [e-mail]
> The Rowland Institute for Science        _/_/_/            _/_/_/_/
> 100 Edwin Land Blvd.                   _/    _/   _/_/    _/
> Cambridge, MA USA 02142-1297          _/_/_/_/  _/   _/  _/_/_/
>                                      _/    _/  _/   _/  _/
> http://www.artofelectronics.com/    _/    _/    _/_/   _/_/_/_/


I believe the part that you are referring to was called a Byristor by CTC
(Communications Transistor Corp.) I think the CTC Part number was BY-1.
It is a diode with the construction of the
base emitter junction of a RF transistor, and a resistor from the anode to
the second terminal. It was intended to be used in
the base bias network of linear amplifiers to temperature compensate the
bias with the same characteristics a the RF transistors
base emitter junction. Motorola application notes use the base emitter
junction of a power transistor that is bolted to the heat sink  to do the same
 job.
I remember the device being discussed in a article in Ham Radio magazine in th
e
70's and in an issue of RF design magazine in the 80's. I hope this helps. Reg
arding
converting the bias to class A  It depends on the device, check the Motorola
application notes for info on this topic. RCA had a good application note on
the topic in there old RF power data book. The basic issue was hot spotting
which is improved by emitter ballast resistors in the RF transistor. I suspect
 though
that you will not get as much improvement as you hope going to full class A.
I suspect that increasing the negative feedback and other distortion canceling

techniques will give better results. I hope this helps

Brian Kline
WA6QDP
[e-mail]


From [e-mail] Sat Oct 19 10:11:22 1996
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From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,sci.electronics.misc,sci.electronics.components
Subject: Re: Q. Unusual RF component in 100 watt 2 to 30MHz wideband linear
Date: Tue, 15 Oct 1996 12:15:44 +0100
Organization: Rutherford Appleton Laboratory, Oxon, UK
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References: <53g96m$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:20210 rec.radio.amateur.equipment:40745 sci.electronics.misc:16012 sci.electronics.components:13259

Winfield Hill wrote:
>
> Can you identify an 4-terminal component called a ACR Z0-28F and
> looking something like a RF power transistor?

It will be some form of regulator. The simplest explanation is that
the module contains a variable voltage regulator the output of which is
governed by the 200 ohm pot. Thermal tracking to prevent runaway and
maintain bias with device temperature is ensured by the package bolted
to the heatsink having some form of temperature sensor.

Unless you really need class A, this device will be appropriate for good
AB1 linearity.

Getting rid of the 3rd harmonic is best done with a filter, not by bias.


From [e-mail] Sat Oct 19 10:11:23 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!mr.net!www.nntp.primenet.com!nntp.primenet.com!ddsw1!news.mcs.net!in-news.erinet.com!news.izzy.net!news
From: [e-mail] (Tim Hynde)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP homebrew list
Date: 14 Oct 1996 15:20:44 GMT
Organization: None
Lines: 13
Message-ID: <53tloc$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mlc.izzy.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

In article <[e-mail]>, [e-mail] says...
>Because it is becomming a list more of people building
>kits and Chasing foxes, I proposed that a new QRP-HB homebrew list be
created.

I agree, and would support a HB list, the problem with the QRP-L in my
opinion isn't so much QRP operation vs Homebrew but it seems to be taking
on all kinds of other junk. Contests that are not QRP endless commentary
that just offers another opinion.(yea I know, like I'm doing here) It's
getting to big for me to wade through each day.

Tim, ka8ddz



From [e-mail] Sat Oct 19 10:11:24 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (raven1)
Newsgroups: rec.radio.amateur.homebrew
Subject: Request for help
Date: 13 Oct 96 09:33:56 GMT
Organization: Netaccess Systems Inc.
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hams with transmitter building experience, please
consider helping victims of civilian electromagnetic
weapons testing.  We want to build a demonstration
device to show public officials that this type of
weapon exists right now, and is not some sort of
futuristic "pie in the sky".

We have signal specifications.  To view those specs
and for further information, please visit:

http://www.netaccess.on.ca/~raven1

Thanks for taking time to read this.

raven1 (P.Eng., former VE3LKE)


From [e-mail] Sat Oct 19 10:11:25 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Fabrizio MODINA)
Newsgroups: rec.radio.amateur.homebrew
Subject: roller inductor where ?
Date: 14 Oct 96 19:27:09 GMT
Organization: ucsd usenet gateway
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

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




From [e-mail] Sat Oct 19 10:11:26 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Fabrizio MODINA)
Newsgroups: rec.radio.amateur.homebrew
Subject: roller inductor where ?
Date: 17 Oct 96 21:51:34 GMT
Organization: ucsd usenet gateway
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

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




From [e-mail] Sat Oct 19 10:11:27 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!tir.com!news
From: "Bill C." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: roller inductor where ?
Date: Thu, 17 Oct 1996 11:58:15 -0700
Organization: The Internet Ramp
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: an3ow.tir.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I; 16bit)
To: Fabrizio MODINA <[e-mail]>

Fabrizio MODINA wrote:
>
> 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
> Call Fair Radio at [phone] or write them at

     Fair Radio Sales
     PO Box 1105
     Lima, Ohio 45802

Once you buy anything from them they keep sending their catalogs and
flyers. I buy something from them often enough to keep the mail coming.
They sell all kinds of surplus parts and equipment. Roller inductors seem
to be in good supply there.

     Bill  KU8H



From [e-mail] Sat Oct 19 10:11:28 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!www.nntp.primenet.com!nntp.primenet.com!news.mindspring.com!usenet
From: Chuck
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RT SYSTEMS - HUNTSVILLE - SCREWED ME OUT OF ALMOST $80 LAST WEEK - RT SYSTEMS - HUNTSVILLE
Date: Wed, 16 Oct 1996 02:11:55 GMT
Organization: MindSpring Enterprises
Lines: 5
Message-ID: <541gib$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: user-168-121-110-97.dialup.mindspring.com
X-Server-Date: 16 Oct 1996 02:16:43 GMT
X-Newsreader: Forte Free Agent 1.0.82

If you're gonna post a flame like this, at least have the decency of
explaining what happened.





From [e-mail] Sat Oct 19 10:11:29 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.kei.com!news.texas.net!news
From: [e-mail] (Richard &/or Patti Herndon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Serching for I/F details
Date: 12 Oct 1996 03:10:23 GMT
Organization: Texas Networking, Inc.
Lines: 19
Message-ID: <53n26v$[e-mail]>
References: <5208ii$[e-mail]>
NNTP-Posting-Host: mnet07-14.austin.texas.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.8 (beta 2)

In article <5208ii$[e-mail]>, [e-mail] says...
>
>it was published an article on QST
>magazine (july 1984) by L. Studebaker titled "A simple, low cost
>computer control for ICOM IC-720". I don't know if it is possible to
>buy a so old back iusse of QST. Is there anyone who can help me?
>73 I8ZSE Giorgio
>
>Giorgio L. Rutigliano
>[e-mail]
>

www.arrl.org
is the place to look for info.  I believe they will not only sell you back
issues, but if the issue is not available, they will photocopy it for you.
This costs money, of course.

73 de K5FNI



From [e-mail] Sat Oct 19 10:11:30 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-fw-12.sprintlink.net!gatech!csulb.edu!news.sgi.com!news.msfc.nasa.gov!bcm.tmc.edu!cs.utexas.edu!news.ti.com!news.dadd.ti.com![e-mail]
From: [e-mail] (Don Shesnicky)
Newsgroups: rec.radio.amateur.homebrew
Subject: Simple Morse Receiver Circuit ?
Date: 17 Oct 1996 17:51:33 GMT
Organization: Design Automation Division, Texas Instruments.
Lines: 9
Message-ID: <545rn5$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ottawa.rtc.sc.ti.com

Does anyone know where I can find a simple circuit for receiving
Morse Code? Nothing special with simple parts.

I'm in Ottawa, Canada so if someone around the area has access
to a fax ...

Thanks
Don



From [e-mail] Sat Oct 19 10:11:31 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!math.ohio-state.edu!uwm.edu!newsspool.doit.wisc.edu!night.primate.wisc.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!rosenews.rose.hp.com!tonyz
From: [e-mail] (Tony Zugec)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Simple Morse Receiver Circuit ?
Date: 17 Oct 1996 22:57:32 GMT
Organization: Hewlett Packard Roseville Site
Lines: 21
Message-ID: <546dks$[e-mail]>
References: <545rn5$[e-mail]>
NNTP-Posting-Host: hprrc97.rose.hp.com
X-Newsreader: TIN [version 1.2 PL2]

Don Shesnicky ([e-mail]) wrote:
: Does anyone know where I can find a simple circuit for receiving
: Morse Code? Nothing special with simple parts.

: I'm in Ottawa, Canada so if someone around the area has access
: to a fax ...

: Thanks
: Don

Try QST August '95 "A rock-bending rcvr for 7 MHz"

Simple direct-conversion w/oscillator for SSB, CW


73's


tony




From [e-mail] Sat Oct 19 10:11:32 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (G4YNM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Smart battery charging circuit???
Date: 11 Oct 1996 11:49:17 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 14
Sender: [e-mail]
Message-ID: <53lq9t$[e-mail]>
References: <53gnl8$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <53gnl8$[e-mail]>, [e-mail] (Bryan
Weaver) writes:

>I'm interested in a circuit to control the charging of a lead acid (ie
car)
>battery.

<snip>

Have a look at my circuit published in QST in March 94. All you'd need to
do is tweak the design so that it kicks in automatically (It'll kick aout
automatically as it stands).

73 Ben


From [e-mail] Sat Oct 19 10:11:32 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newsstand.cit.cornell.edu!news.acsu.buffalo.edu!acsu.buffalo.edu!tumino
From: [e-mail] (Thomas N Tumino)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Smart Gel Cell battery charger
Date: 17 Oct 1996 02:21:13 GMT
Organization: University at Buffalo
Lines: 18
Message-ID: <54456p$[e-mail]>
References: <54127c$[e-mail]>
NNTP-Posting-Host: conciliator.acsu.buffalo.edu
NNTP-Posting-User: tumino
X-Newsreader: TIN [version 1.2 PL2]

If the batteries are 12v then you can just "float" them accross your 13.8
volt supply.....slow but sure and cheap.


Daniel Lavoie ([e-mail]) wrote:

: I have a lot of gell cell battery packs that were taken off UPS'.  Do you
: know where I can find a good article on gell battery charging.  I would
: even consider buying the charger from a commercial retailler if you know a
: good make.

: My requirements are to be able to rechage a battery pack with a combined
: power rating of  200 watts/hour.

: Thanks

: Daniel
: VE3DCL


From [e-mail] Sat Oct 19 10:11:34 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!panix!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!hookup!vertex.tor.hookup.net!nic.wat.hookup.net!loki.tor.hookup.net!news
From: [e-mail] (Craig Stimson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Smart Gel Cell battery charger
Date: Fri, 18 Oct 1996 04:00:25 GMT
Organization: HookUp Communication Corporation, Oakville, Ontario, CANADA
Lines: 35
Message-ID: <546vp0$[e-mail]>
References: <54127c$[e-mail]> <54456p$[e-mail]>
NNTP-Posting-Host: cstimson.tor.hookup.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Thomas N Tumino) wrote:

>If the batteries are 12v then you can just "float" them accross your 13.8
>volt supply.....slow but sure and cheap.
>Daniel Lavoie ([e-mail]) wrote:
>: I have a- lot of gell cell battery packs that were taken off UPS'.  Do you
>: know where I can find a good article on gell battery charging.  I would
>: even consider buying the charger from a commercial retailler if you know a
>: good make.

Daniel

If your looking for commercial chargers try the following:

The Battery Company
Ph 1 800-695-9482

Ratelle Communications
Ph [phone]

They both sell Power Sonic SLA batteries. Ratelle has this nice smart
charger for 6 & 12 V batteries that is good for the full range of AH
ratings available. The Battery Company may be able to send you some
literature that pertains to charging methods of "Powersonic
Batteries" which you may find useful for other makes too.

Hope this helps.

Craig
++++++++++++++++++++++++++++++++++++++++++
+  Craig Stimson                                                          +
+  E-mail: [e-mail]                                   +
+  AX.25 : VA3DCS@VE3ZRD.#SCON.ON.CA.NA          +
++++++++++++++++++++++++++++++++++++++++++



From [e-mail] Sat Oct 19 10:11:34 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news-out.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!super.zippo.com!zdc-e!uunet!in1.uu.net!news.shentel.net!usenet
From: "Dacha" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Source for 300-302 MHz crystals?
Date: 17 Oct 1996 15:47:13 GMT
Organization: Visor and Associates Inc.
Lines: 9
Message-ID: <01bbbc41$4dc0d5c0$5b036fcc@dacha>
NNTP-Posting-Host: eb5ppp27.shentel.net
X-Newsreader: Microsoft Internet News 4.70.1155

Can someone help me find a source for 300 to 302 MHz crystals to be used in
a low power xmiter.
I now have 75 MHz and 150 MHz HC 45/U crystals that I multiply. I now have
one
360 MHz crystal marked "experimental"
It works great, but is a bit high in frequency for my purpose.





From [e-mail] Sat Oct 19 10:11:35 1996
Path: news1.epix.net!news3.epix.net!cdc2.cdc.net!news.texas.net!news.kei.com!news.thenet.net!uunet!in3.uu.net!news.uunet.ca!apollo.isisnet.com!bellglobal.com!news1.sympatico.ca!news
From: ED GRACE <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: sstv
Date: Sun, 13 Oct 1996 03:16:39 -0700
Organization: Sympatico
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: hlfx03-48.ns.sympatico.ca
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02E-SYMPA  (Win16; I)

does anyone have a schematic for a computer interface that
 can convert a signal from a vcr to a digital format that can be stored
 in the computer and then be used for slow scan television programs such
 as jvfax,proscan,mscanetc.. i would appreciate any help in this area
                [e-mail]----------


From [e-mail] Sat Oct 19 10:11:36 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!news.sprintlink.net!news-peer.sprintlink.net!itnews.sc.intel.com!news.sprintlink.net!news-ana-7.sprintlink.net!eskimo!news
From: [e-mail] (Bill Turner)
Subject: Surface Mount prototype board?
X-Nntp-Posting-Host: wrt.ndip.eskimo.net
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Content-Transfer-Encoding: 7bit
Organization: Eskimo North (206) For-Ever
X-Newsreader: Forte Agent .99f/16.299
Mime-Version: 1.0
Date: Wed, 16 Oct 1996 01:03:15 GMT
Lines: 5

Does anyone know of a source for SMT prototype boards?  Something on the order
of the Radio Shack through-hole ones, but laid out for surface mount parts.

73, Bill W7LZP
[e-mail]


From [e-mail] Sat Oct 19 10:11:37 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!newshost.convex.com!news.onramp.net!usenet
From: Dave Hills <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Surface Mount prototype board?
Date: Wed, 16 Oct 1996 08:24:36 -0500
Organization: DH Associates
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: lbj27.onramp.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; I)
To: Bill Turner <[e-mail]>

Bill Turner wrote:
>
> Does anyone know of a source for SMT prototype boards?  Something on the ord
er
> of the Radio Shack through-hole ones, but laid out for surface mount parts.


Digi-Key has some.  See http://www.digikey.com .
--



Dave Hills, P.E.
DH Associates
[e-mail]




From [e-mail] Sat Oct 19 10:11:38 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!news.campus.mci.net!not-for-mail
From: "Bob R. Miller" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: surplu component source(s) ???
Date: 11 Oct 1996 12:24:54 GMT
Organization: CampusMCI
Lines: 16
Message-ID: <01bbb76e$b5fd9100$7f021dce@default>
References: <[e-mail]>
NNTP-Posting-Host: s08-pm08.ucr.campus.mci.net
X-Newsreader: Microsoft Internet News 4.70.1155

Is Dans's Small Parts gone? I was at a swap last weekend and they were
passing out catalogs.  I got a mailing from him about a month ago, so think
he is still around.  I can't find the catalog in my stack of papers sorry.
Good luck.  Bob

scott <[e-mail]> wrote in article <[e-mail]>...
> Now that Dan's Small Parts is gone, anybody know of a source of parts
> like MFE131 (40673 MOSFET sub.), NP0 caps, small air variable caps, etc.?

>  Sure is making homebrew QRP items tough these days.  73, N0EDV.
>
> --
> Gotta FLY or gonna Die !
>     Ask me about my
>  Aeronca Super Chief !
>


From [e-mail] Sat Oct 19 10:11:39 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!homer.alpha.net!usenet
From: scott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: surplu component source(s) ??? I BLEW IT!
Date: Sat, 12 Oct 1996 02:03:05 -0700
Organization: Aero Head Aviation
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ppp1.westby.mwt.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; U)

scott wrote:
>
> Now that Dan's Small Parts is gone, anybody know of a source of parts
> like MFE131 (40673 MOSFET sub.), NP0 caps, small air variable caps, etc.?
>  Sure is making homebrew QRP items tough these days.  73, N0EDV.
>
> --
> Gotta FLY or gonna Die !
>     Ask me about my
>  Aeronca Super Chief !

I MADE A BIG MISTAKE....DAN'S SMALL PARTS IS NOT OUT OF BUSINESS...I HAD
HEARD THEY WERE AND DID NOT CONFIRM THE FACT...I COULDN'T FIND AN ADDRESS
OR TELEPHONE NUMBER SO I ASSUMED THE INFO I HAD WAS CORRECT.  I APOLOGIZE
TO DAN FOR THIS!  I'M HIS NUMBER ONE FAN AND GLAD HE'S STILL AROUND!  HE
HAS AN INTERNET CATALOG AT http://www.fix.net/dans.html.

--
Gotta FLY or gonna Die !
    Ask me about my
 Aeronca Super Chief !


From [e-mail] Sat Oct 19 10:11:40 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!nntp.crl.com!news.PBI.net!ns2.foothill.net!usenet
From: Eugene Rippen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Sweep Tubes  FS
Date: Fri, 11 Oct 1996 21:23:41 -0700
Organization: Sound Values
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: angeles-d89.foothill.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; U)
Content-Disposition: inline; filename="TU101196.TXT"

     For Sale the following new, tested tubes in cartons.

     Quantity       Type      Price Each
     3              6ME6      20.00
     3              6LQ6      25.00
     4              6LB6      14.00
     2              6JB6      15.00
     1              6LR6      20.00
     2              6KV6A     25.00
     1              6KD6      25.00
     1              6LR6      20.00

     Add shipping cost.

     Eugene Rippen, 105 Donnington, Auburn, CA 95603
     Email    [e-mail]
     NO phone calls please.



From [e-mail] Sat Oct 19 10:11:41 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!malgudi.oar.net!hyperion.wright.edu!news.wright.edu!nova.wright.edu!nyoung
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: The bandwidth of the technologically impressed & homebrewing &c
Date: 14 Oct 96 12:11:22 EST
Organization: Wright State University
Lines: 65
Message-ID: <[e-mail]>
NNTP-Posting-Host: nova.wright.edu

And furthermore, he said with the air of a pontificating putz,
it ain't so much that technology is zipping onward with exponential
increases in speed. It's the bandwidth of the technology itself.

One of the discussers here had mentioned DSP &c as a place due for
more research, more trial and education. I agree. It's like saying
that television must forever more remain NTSC (or PAL or SECAM, if
you live in those worlds) and that never should digital concepts be
passed down to the television viewers or market. To do so would
ignore the changes in the building of TV images over the past 20
years or so. As in: I remember back around 1972 reading in the now-
defunct _Ham Radio Magazine_ about some guy who was messing with the
then neonatal forms of CCD/pixel-oriented image building. There was a
picture of his callsign plootsched out into a 1-inch square of very
tiny boxes. I looked at that and said that TTY (as we knew it then)
was headed for the dumpster. I was right. Now we have OCR systems
that do away with "cutting tapes" for RTTY; we have laser printers
and DMPs that do away with TTY "stunt boxes"; we have digital modes
that add almost uncontrollables levels of encryption & security
(spread spectrum being only one of 'em), all far beyond the wildest
dreams of any RM2s and RM3s that I knew back then.

In fact, those ol' pixels now allow me to put a monstrous image of
Hulk Hogan or Macho Man Randy Savage on my living room wall so as
to not miss one glob of flying spit as either of 'em hits the
turnbuckle.

THe change is there, as it always has been. And yet, I personally
derive a certain arcane pleasure out of recreating -- especially for
my eight-year-old ('cause he likes it) -- one tubers and crystal
sets... if only because they are such great teachers of the fundamentals
at the core of this broad spectrum of technological change. ANd it
makes me feel good too, knowing that as much as I have gotten older,
I can still figure out which tube pin gets the 6.3 VAC and which gets
the 110 VDC. That stuff -- the details -- are terribly important. I
have a ARC-5 receiver with blown filaments to prove it.

So before anyone gets sidetracked by my references to tubes and
the popularly hot-ticket CK722 (remember them?), maybe I should make
my personal position clear:

To bring Freud into the set-up, sometimes a cigar is just a cigar.
Food is food. I like grits with my over-easy eggs. Other's hate the
white stuff and want only well-greased, fried in lard, thinly sliced
hashbrown potatoes. But either way it's "plug 'em up and die;" we
still end up eating breakfast. So I dig old tube radios 'cause they're
my last ditch nostalgia trip. That doesn't mean that I wouldn't take
a multi-mode 440 MHz transceiver. Fact is, I'd love to have in one
box 30 MHz of spectrum to match the 30 MHz of HF spectrum that I have
in my antiquated TR7. That and a new Barco 3000 LC so Hulk Hogan
could be even more real as he flops head first and nearly broken
onto the mat. After all, that guy back in '72 had a pretty good idea.
If only I could get myself fired up about SSTV... as if drooling after
the latest RisoGraph duplicator ain't enough to make me reconsider
the 1890s-vintage type collection what already clutters up the garage.
And, now that I think of it, that's a spectrum too: print media of
my father's day, print media of my son's youth, electrons & all.

Anybody for BPSK on 1.75 km? (But first you have to explain what
BPSK is... nice and slow... so I can copy down the dits and dahs.)

73
Nils
WB8IJN &c



From [e-mail] Sat Oct 19 10:11:42 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!newsgate.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The Handicapper General & the Morse key of the Oppressed
Date: 5 Oct 1996 04:31:19 GMT
Organization: Dover Research Corp.
Lines: 30
Message-ID: <534oan$eie$[e-mail]>

I never thought of it in the way you discribe.  However since we both went
to boot camp (in both ways) what would you think of sailing with guys who
passed on boot camp?  Would you feel safe wondering if he would follow orders
or maybe just debate them with whoever was giving them?  For me personaly,
I had a tough time with CW at first.  After talking with a few people and
reading some REALLY old QSTs I figured out that the old technique of starting
of fast and jsut learning a few letters at a time was the key.  I picked
up my advanced in short order.  After this I tried this trick on a room full
of teenagers who wanted to learn S-O-S.  I'm talking Jr High kids with
attention spans of about 1/2 second max.  In a couple of 1 hour sessions they
were able to copy code groups of 12 of the letters at 16 wpm!  None of them
was told that CW was hard or sucked or whatever.   Anyway I didn't like
boot camp.  Would I like to ship out with some "civilians"?
More important what "good" is CW?  I happen to think it is relevent today.
Look at the work on VHF+   Yes, I know a lot of guys think all the work is
FM or maybe SSB.  Not much voice on Moonbounce, or Meteor Scatter!  A lot
of the week signal work is CW.  I've made a handfull of contacts on 1296.
All CW!  On HF count the number of stations on phone (and just for grins the
space they use up) than count the number of stations on CW.  Surprise!  While
it might not be 50-50 it is a hell of a lot closer than many people want to
admit.  Now look at the space the phone boys use up.  CW to me is relevent.
I also think 5wpm IS no code.  Heck Uncle Wayne points out that at this speed
you might as well write down the dits and dahs.  Or if you learned it wrong
like I did (at first) the Dots and Dashs.  Once you learn it well enough for
it not to be a torture I think you might be pleased to meet some of the people
on the bottom of the band.  They are Ladies and Gents!  Can't say that about
all the phone users.  Oh well.  Enough said.
BTW Camp Berry Great Lakes?
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Sat Oct 19 10:11:43 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: The person who helped with Cubic info???????????
Date: Fri, 11 Oct 1996 10:15:14 -0500
Organization: HoloNet National Internet Access System: 510-704-1058/modem
Lines: 19
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 157.151.205.58
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (Win95; I)

Last week (10/1 - 10/4) I put a plea for help for info on Cubic
Electronics in Ocean Side, Ca. Some very nice gentleman gave me the info
I needed. I have since had a complete system crash and lost ALL my
messages...in fact I lost 2 hard drives with everything on them. The
only thing I remember about the message was that his address started
with something like "HONT"..his name was Loenk (?), The important thing
was, he gave me the name of a guy that had worked for Cubic. He said the
guy still repaired Cubic radios for a fair price. H ealso said the guy
had a fax on during the day but in the evening it was off line. He gave
me the telephone number and all the info I needed. I can't remember
which newsgroup it was in. If he will PLEASE contact me again I would
appreciate it very much. I need the same info again.

I am posting this to all the ham and radio newsgroups to find this good
samaritan again. I sent him a thank you message, but of course that is
also gone now so I can't get the address from there.

Tommy Statham
N5HTQ


From [e-mail] Sat Oct 19 10:11:44 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!nntp-hub2.barrnet.net!news.PBI.net!usenet
From: [e-mail] (JF)
Newsgroups: rec.radio.amateur.homebrew
Subject: Toroid Coils
Date: Sat, 19 Oct 1996 08:10:15 GMT
Organization: A customer of Pacific Bell Internet Services
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp-206-170-69-44.irvn11.pacbell.net
X-Newsreader: Forte Agent .99e/16.227

Toroid Coils are available from Amidon,Inc  3122 Alpine Ave  Santa
Ana, CA 92704 [phone]  Fax [phone]

They have kits (at a much better price) of both ferrite and powdered
iron toroids.  The kits are a good deal compared to the individual
prices.

Jim Ford, N6JF


From [e-mail] Sat Oct 19 10:11:45 1996
Path: news1.epix.net!news3.epix.net!news.sprintlink.net!news-pen-14.sprintlink.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: Using Ku TWT for X-band
Date: 14 Oct 1996 18:47:32 GMT
Organization: 3Com
Lines: 21
Message-ID: <53u1s4$[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

A week or two back someone asked about using a 12-18 GHz TWT for 10 GHz...
sorry, I lost the original post. Hope you are still around.

I haven't done this myself, but it has been done by several hams for X-band
operation.  It will require that the TWT not have waveguide feeds with a cutof
f
above the desired band.  If it has waveguide that is broad enough for X-band,
or SMA or N, it should be do-able.  You may need to lower the high voltage
which will lower the operating frequency, and some magnets added around the
tube may help peak the output and lower helix current.

Jim Vogler, WA7CJO, did two excellent presentations with lots of TWT tips for
microwave hams -- "Optimizing TWT Power for Narrow Band CW/SSB Operation" and
"10 GHz Moonbounce".  They are both contained in one of the Proceedings books
available from the ARRL. The one for these articles is "38th West Coast VHF/UH
F
Conference -- 1993".  According to the ARRL list it is still available for $12
.

You can reach ARRL on the web at www.arrl.org or by email to [e-mail].  The

various ARRL proceedings are an extremely valuable source for microwave hams.

- Rex, KK6MK



From [e-mail] Sat Oct 19 10:11:46 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.eden.com!net-3-110
From: [e-mail] (Biomathematician)
Newsgroups: rec.radio.amateur.homebrew
Subject: Where to buy Motorola CA 2818 C?
Date: Wed, 16 Oct 96 05:37:38 GMT
Organization: EVH Research
Lines: 9
Message-ID: <541sb9$[e-mail]>
NNTP-Posting-Host: net-3-110.austin.eden.com
X-Newsreader: News Xpress Version 1.0 Beta #4

The subject says it all.  I've checked with RF parts, and they
don't sell that line.  Any suggestions would be appreciated.
thanks in advance.

$$e^{-\frac12 K^2} \frac d{dK} e^{\frac12 K^2}e^{\sqrt{in}}$$
Kevin McWilliams
KW5Q
Applied Mathematician



From [e-mail] Wed Oct 30 06:33:42 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!in3.uu.net!holonet!colossus.holonet.net!atdbbs!clint.bradford
From: [e-mail] (Clint Bradford)
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: Sat, 26 Oct 1996 03:10:00 GMT
Message-ID: <[e-mail]>
Organization: ATTENTION to Details BBS - Mira Loma, CA
Distribution: world
References: <[e-mail]>
Lines: 7


>>I am looking for a QST article in 1992 called "Low Cost Digital
>>Signal Proccessing for the Radio Amateur" by Dave Hershberger.

QST September 1992 page 43.

-Clint Bradford


From [e-mail] Wed Oct 30 06:33:43 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news.preferred.com!news
From: "James R. Chastain" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 10GHZ 10 watt amp help needed!!
Date: 25 Oct 1996 12:17:23 GMT
Organization: Preferred Internet Inc.
Lines: 7
Message-ID: <01bbc276$cdd46980$[e-mail]>
NNTP-Posting-Host: 207.159.71.184
X-Newsreader: Microsoft Internet News 4.70.1155

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)


From [e-mail] Wed Oct 30 06:33:44 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!netnews.worldnet.att.net!newsadm
From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10GHZ 10 watt amp help needed!!
Date: Fri, 25 Oct 1996 22:32:15 -0700
Organization: http://geocities.com/capecanaveral/3722
Lines: 19
Message-ID: <[e-mail]>
References: <01bbc276$cdd46980$[e-mail]>
NNTP-Posting-Host: 127.st-louis-006.mo.dial-access.att.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01E (Win16; I)

Hi... Can't help directly, but try Hughes rather than Hughs.. Woody

James R. Chastain wrote:
>
> 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)

--
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] Wed Oct 30 06:33:47 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!arclight.uoregon.edu!dispatch.news.demon.net!demon!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!news.alt.net!newspost1.alt.net!usenet
From: "Peter Gottlieb" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 120VAC scanner from 12VDC
Date: 26 Oct 1996 18:24:32 GMT
Organization: Altopia Corp. - Affordable Usenet Access - http://www.alt.net
Lines: 37
Message-ID: <01bbc36b$006d4a20$4f132399@peter-s>
References: <541okc$[e-mail]> <5496rm$[e-mail]> <[e-mail]>
X-Newsreader: Microsoft Internet News 4.70.1155



Rob Janssen <[e-mail]> wrote in article
<[e-mail]>...
> In <5496rm$[e-mail]> [e-mail] (Paul C)
writes:
>
> >William J. Skellenger ([e-mail]) wrote:
>
> >: I took this unit apart (Realistic PRO-2024) and measured the DC
voltage
> >: off of the rectifier on the board.  It was 13.5VDC, for all practical
> >: purposes automotive 12V.  I installed a small coaxial power plug and
> >: soldered it directly to either side of the rectifier on the board.
> >: After plugging it in, I found that everything worked properly except
for
> >: that it *DIDN'T RECEIVE*.
>

I have seen some devices (VCRs, for example) that also use the 60 Hz as a
reference clock for some circuits.  When I adapted a JVC VCR to 12 volt
operation I had to use a CMOS chip that used a color burst crystal to
generate
a 60 Hz square wave.

Check for other voltages, as mentioned, also.

Try disconnecting temporarily the 12 volt power supply and run the 12 volt
circuits
from a battery, while the unit is still plugged in.  This will verify that
the 12 volt
input is within range for the circuits, and also would prove that there is
either a
clock or power path from the power supply that you missed...

PS, fuse and zener protect the input!



From [e-mail] Wed Oct 30 06:33:48 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!newsfeed.randomc.com!news.miracle.net!wariat.org!news.apk.net!usenet.ins.cwru.edu!gatech!csulb.edu!news.sgi.com!howland.erols.net!newsfeed.internetmci.com!news.bctel.net!news.island.net!vertex.tor.hookup.net!nic.ott.hookup.net!news
From: Georges Berthiaume <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 220 NOTES
Date: 23 Oct 1996 09:27:50 GMT
Organization: InterWeb Internet Services Inc.
Lines: 14
Message-ID: <54koem$[e-mail]>
NNTP-Posting-Host: hope.interweb.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12 (X11; I; BSD/OS 2.0 i386)
X-URL: news://ott.hookup.net/rec.radio.amateur.homebrew

Hi,

Does anyone know if the 220 notes publication is still around?

Would there be a recent address?

Or even better, does someone have back copies that I would pay
to have copied and sent to me?

Thanls,

Georges
VE3PFZ



From [e-mail] Wed Oct 30 06:33:49 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!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!news
From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-1000 /AB2 intermod???
Date: Sun, 27 Oct 1996 17:01:24 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 8
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: dyn23.frazmtn.com
X-Newsreader: Forte Agent .99e/16.227

Anyone know what one could expect in IMD using the 4-1000 in AB2/SSB
(6kv anode, 500v screen, -70v bias)??   Is it possible to get -36 to
-40 db imd (3rd order)  in AB2/SSB using a conventional  grid driven
circuit (not grounded grid) .
73, Jesse, W6KKT





From [e-mail] Wed Oct 30 06:33:50 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!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4-1000 /AB2 intermod???
Date: 29 Oct 1996 02:40:41 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 26
Sender: [e-mail]
Message-ID: <554cdp$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>Anyone know what one could expect in IMD using the 4-1000 in AB2/SSB
>(6kv anode, 500v screen, -70v bias)??   Is it possible to get -36 to
>-40 db imd (3rd order)  in AB2/SSB using a conventional  grid driven
>circuit (not grounded grid) .
>73, Jesse, W6KKT

Jesse, I used 4-1000's years ago, and did IMD tests on them.

They were cleaner in cathode driven AB1 than in conventional grid driven
AB1, but not "state of the art" in either configuration. I measured IMD
suppression of less than  -30 dB 3rd order for a conventional IMD test
(below a single tone) at 1000 watts PEP input.

It varied a bit with the particular tube tested. I take it your figures
are for IMD against PEP (a non-standard method)? If so, you might come
close to -36 if the cathode is driven or a unbypassed resistor is included
in the cathode to add negative RF feedback. Without proper RF feedback you
likely would not get that figure.

Be sure to properly select the grid resistance to keep the exciter
operating at optimum output power, and regulate the voltages good.

73 Tom


From [e-mail] Wed Oct 30 06:33:51 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!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (BobbyHigg)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-1000A (Pair) Plans/Construction Hints
Date: 23 Oct 1996 00:13:27 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <54k617$[e-mail]>
Reply-To: [e-mail] (BobbyHigg)
NNTP-Posting-Host: newsbf02.mail.aol.com

My parts kit runith over and is about to become reality!  Before I etch
the first piece of metal, I would like to find others that have built or
have information concerning the construction of th Bill Brown "Bomb" as
described in ham rags of the 60's.  If you have anything that would assist
me, please let me know.

Thanking you in advance--Bob--WB0DBM


From [e-mail] Wed Oct 30 06:33:51 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!news
From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: 6 meter mod for homebrew tv ant?
Date: 23 Oct 1996 11:40:12 GMT
Organization: Your Organization
Lines: 17
Distribution: world
Message-ID: <54l06s$[e-mail]>
NNTP-Posting-Host: sl33.cyberia.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Thanks for reading this post.  I recently received an used tv antenna from my
brother-in-law.  It's in good shape since it was in the attic.  (no corrosion)

The longest dipole is just a little shorter than is needed for the 6 meter
band.  I put some 8" extensions on each side of the dipole but have yet to cut

them.  My question is this:

What length should I cut the dipole to to get in the middle of the band?
(52Mhz)

I have calculated it at 113.5 inches from tip to tip.  (1/2 wavelength) should

it be a little longer or shorter?  Any help would be greatly appreciated.  I'm

building a qrp single chip 6 meter fm transmitter and would like to use this
antenna.    Thanks...

73 de Tyler
N3SPD



From [e-mail] Wed Oct 30 06:33:55 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!oronet!usenet
From: [e-mail] (Jim Weir)
Newsgroups: rec.antiques.radio+phono,rec.aviation.military,rec.ham-radio,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Aluminum surface treatment info wanted
Date: Mon, 21 Oct 1996 16:35:50 GMT
Organization: RST Engineering
Lines: 32
Message-ID: <54g8rp$[e-mail]>
References: <01bbbdde$015bbf80$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news1.epix.net rec.antiques.radio+phono:30484 rec.aviation.military:114278 rec.radio.amateur.homebrew:20394 rec.radio.swap:92136

"Loek d'Hont" <[e-mail]> shared these priceless pearls of wisdom:
->I am restoring some radios but have problems with repairing the aluminum
->coating.

What you are looking at is the chromate version of Alodine.  Alodine is an
aluminum chemical film corrosion inhibitor and is really quite excellent.
Most well-stocked automotive paint stores (not the handyman stores) have
alodine.

I would suggest that you get a bottle of Metl-Prep while you are there.  It
is a alkaline etch for the aluminum that strips the old corroded aluminum
surface down to the bare clean metal.  THEN Alodine it and it is good for a
long time.  Watch out, the stuff will turn you into a girl if you spill it
on the wrong spot.

Be VERY CAREFUL with the Alodine.  There have been some credible reports
that it is a decent carcinogen.  Then again, the same is said of filet
mignon.

If the paint stores don't have it, the aircraft parts houses certainly have
it.  We couldn't live without it in the flying game.  By the way, if you
have the option to use stainless steel hardware with the chassis, it will
cut WAY down on that "powder white" corrosion that you see.

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] Wed Oct 30 06:33:56 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!oronet!usenet
From: [e-mail] (Jim Weir)
Newsgroups: rec.antiques.radio+phono,rec.aviation.military,rec.ham-radio,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Aluminum surface treatment info wanted
Date: Tue, 22 Oct 1996 21:48:28 GMT
Organization: RST Engineering
Lines: 24
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"Paul J. Adam" <[e-mail]> shared these priceless pearls of
wisdom:
->>
->>Be VERY CAREFUL with the Alodine.  There have been some credible reports
->>that it is a decent carcinogen.  Then again, the same is said of filet
->>mignon.

->It's a major hazard, as far as our safety people are concerned, and I'm
->frankly surprised it's available retail. Handle it with great care.

->It does work well, though, which is why its corrosive and carcinogenic
->properties are tolerated.

Are you talking about the Alodine or the filet?     {;-)


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] Wed Oct 30 06:33:57 1996
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From: Roland Burgan <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.aviation.military,rec.ham-radio,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Aluminum surface treatment info wanted
Date: Tue, 22 Oct 1996 16:41:02 -0400
Organization: up.net
Lines: 36
Message-ID: <[e-mail]>
References: <01bbbdde$015bbf80$[e-mail]>
         <54g8rp$[e-mail]> <[e-mail]>
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Has anyone used Zinc-Chromate for this purpose...used to be available
at most Automotive Supply stores...rather expensive, though.

Paul J. Adam wrote:
>
> In article <54g8rp$[e-mail]>, Jim Weir <[e-mail]> writes
> >What you are looking at is the chromate version of Alodine.  Alodine is an
> >aluminum chemical film corrosion inhibitor and is really quite excellent.
> >Most well-stocked automotive paint stores (not the handyman stores) have
> >alodine.
>
> We use something similar as ALOCROM for repairing damaged anodising on
> Sting Ray and Spearfish hulls.
>
> >I would suggest that you get a bottle of Metl-Prep while you are there.  It
> >is a alkaline etch for the aluminum that strips the old corroded aluminum
> >surface down to the bare clean metal.  THEN Alodine it and it is good for a
> >long time.  Watch out, the stuff will turn you into a girl if you spill it
> >on the wrong spot.
> >
> >Be VERY CAREFUL with the Alodine.  There have been some credible reports
> >that it is a decent carcinogen.  Then again, the same is said of filet
> >mignon.
>
> It's a major hazard, as far as our safety people are concerned, and I'm
> frankly surprised it's available retail. Handle it with great care.
>
> It does work well, though, which is why its corrosive and carcinogenic
> properties are tolerated.
>
> --
> "There are four kinds of homicide: felonious, excusable, justifiable and
> praiseworthy."
> Ambrose Bierce, "The Devil's Dictionary"
>
> Paul J. Adam                                 [e-mail]


From [e-mail] Wed Oct 30 06:33:58 1996
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From: "Paul J. Adam" <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.aviation.military,rec.ham-radio,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Aluminum surface treatment info wanted
Date: Tue, 22 Oct 1996 21:00:28 +0100
Organization: Wholesale Lunacy
Lines: 32
Distribution: world
Message-ID: <[e-mail]>
References: <01bbbdde$015bbf80$[e-mail]>
 <54g8rp$[e-mail]>
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In article <54g8rp$[e-mail]>, Jim Weir <[e-mail]> writes
>What you are looking at is the chromate version of Alodine.  Alodine is an
>aluminum chemical film corrosion inhibitor and is really quite excellent.
>Most well-stocked automotive paint stores (not the handyman stores) have
>alodine.

We use something similar as ALOCROM for repairing damaged anodising on
Sting Ray and Spearfish hulls.

>I would suggest that you get a bottle of Metl-Prep while you are there.  It
>is a alkaline etch for the aluminum that strips the old corroded aluminum
>surface down to the bare clean metal.  THEN Alodine it and it is good for a
>long time.  Watch out, the stuff will turn you into a girl if you spill it
>on the wrong spot.
>
>Be VERY CAREFUL with the Alodine.  There have been some credible reports
>that it is a decent carcinogen.  Then again, the same is said of filet
>mignon.

It's a major hazard, as far as our safety people are concerned, and I'm
frankly surprised it's available retail. Handle it with great care.

It does work well, though, which is why its corrosive and carcinogenic
properties are tolerated.


--
"There are four kinds of homicide: felonious, excusable, justifiable and
praiseworthy."
Ambrose Bierce, "The Devil's Dictionary"

Paul J. Adam                                 [e-mail]


From [e-mail] Wed Oct 30 06:33:59 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!cs.utexas.edu!news.ti.com!newsfeed.mc.ti.com!usenet
From: "Loek d'Hont" <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.aviation.military,rec.ham-radio,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Aluminum surface treatment info wanted
Date: 25 Oct 1996 04:29:55 GMT
Organization: Texas Instruments
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Message-ID: <01bbc22d$2fcb7380$[e-mail]>
References: <01bbbdde$015bbf80$[e-mail]> <54g8rp$[e-mail]> <[e-mail]> <54jfih$[e-mail]>
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I would like to thank all people who responded to this, either by email or
newsgroup.

Got lots of reactions, some of them very worthy.

Thanks again.

Loek d'Hont   [e-mail]



From [e-mail] Wed Oct 30 06:34:00 1996
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From: [e-mail] (James Holtzman)
Newsgroups: rec.antiques.radio+phono,rec.aviation.military,rec.ham-radio,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Aluminum surface treatment info wanted
Date: 26 Oct 1996 00:47:00 GMT
Organization: California State University, Sacramento
Lines: 16
Distribution: world
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References: <01bbbdde$015bbf80$[e-mail]> <54g8rp$[e-mail]> <[e-mail]>
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I missed the beginning of this thread, so I hope I'm on track.  If you are
trying to repair a surface that was black anodized, on alulminum, of course,
I purhase a little bottle from gun stores, made for blacking aluminum, called
"aluminum black".  You degrease the surface, and apply sequencial  amounts,
with a cotton swap, etc.  After a few minutes, the surface turns to a dull
black.  Not as good as anodizing, but at least you can do it at home.

I think the manufacturer is "Birchwood Casey".  You might also try some
sporting goods supplys.

jrh

--
James Holtzman kc6ncg Team OS/2 ([e-mail]) [phone]
Manager Computer Tech Support, Engineering & Computer Science, CSU, Sacto, CA
"What this country needs is less people telling us what this country needs"


From [e-mail] Wed Oct 30 06:34:01 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!super.zippo.com!zdc!www.nntp.primenet.com!nntp.primenet.com!cpk-news-hub1.bbnplanet.com!nntp-hub2.barrnet.net!news.PBI.net!samba.rahul.net!rahul.net!a2i!news.walltech.com!news.his.com!node2.frontiernet.net!news.sprintlink.net!news-peer.sprintlink.net!ratty.wolfe.net!usenet
From: Ramon Gandia <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: Tue, 22 Oct 1996 04:30:42 -0800
Organization: Anvil Technology
Lines: 20
Message-ID: <[e-mail]>
References: <536pvq$[e-mail]> <[e-mail]> <54e7bf$[e-mail]>
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Ernest Hansen wrote:
>
> At one time, I had ideas about setting up a radar system. High power
> microwave is not healthy.

CW or FM radars (not pulsed type)(also known as doppler radars)
do not need high power.

But I can see it, converting your Kenmore Microwave oven into
a radar set....and you can roast winnies in it while watching
the traffic.  Bet you can sell something like that to the
Hiway Patrol!!

--
In order to foil SpamBots, my e-mail address is not
machine readable.  Please reply to address below:

Ramon Gandia,    Nome, Alaska  |    rfg.at.nome.dot.net
AL7X          S/V Seven Stars  |
907-443-2437 fax [phone]  | where at=@  dot=period


From [e-mail] Wed Oct 30 06:34:02 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!nntp.primenet.com!swrinde!cssun.mathcs.emory.edu!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Amateur Radar
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <536pvq$[e-mail]> <[e-mail]> <54e7bf$[e-mail]> <[e-mail]>
Date: Tue, 22 Oct 1996 16:26:25 GMT
Lines: 22

In article <[e-mail]> [e-mail] write
s:
>Ernest Hansen wrote:
>>
>> At one time, I had ideas about setting up a radar system. High power
>> microwave is not healthy.
>
>CW or FM radars (not pulsed type)(also known as doppler radars)
>do not need high power.

That's right. Our Harris doppler weather radar runs a whopping
20 watts chirp, but gives us the same 250 mile coverage as our old
75 kW pulse radar. The major difference is the vast improvement
in receiver technology. Instead of a 1N21B diode detector in the
front end, the newer unit uses a GASFET preamp, coherent detection,
and DSP back end processing.

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] Wed Oct 30 06:34:03 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!nntp.snet.net!news.snet.net!usenet
From: VINCENT COPPOLA <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Amateur Radar
Date: Mon, 21 Oct 1996 23:13:33 -0400
Organization: SELF
Lines: 13
Message-ID: <[e-mail]>
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In reference to one of the amateur radar messages recently posted, I
would like to get a copy of the Gunnplexer Cookbook article refering to
chirp with a Gunnplexer. I have done some experimenting with FM-CW on the
MACOM 87127 by modulating the varator with a triangle wave with a period
of 10 hz and amplifying the audio tones from the mixer. Of course the
higher the frequency the farther the object.

I think i would prefer to use a pulse radar, which is legal on all of the
amateur microwave bands except for 23 cm and 3cm. Does anybody know why?
I would like to correspond with anybody sharing a similar interests.


Viny Coppola N1VC


From [e-mail] Wed Oct 30 06:34:05 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.stealth.net!news.idt.net!news
From: Dave Riley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur Radar
Date: Thu, 24 Oct 1996 15:19:40 -0400
Organization: IDT Corporation
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
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To: VINCENT COPPOLA <[e-mail]>

VINCENT COPPOLA wrote:
>
> In reference to one of the amateur radar messages recently posted, I
> would like to get a copy of the Gunnplexer Cookbook article refering to
> chirp with a Gunnplexer. I have done some experimenting with FM-CW on the
> MACOM 87127 by modulating the varator with a triangle wave with a period
> of 10 hz and amplifying the audio tones from the mixer. Of course the
> higher the frequency the farther the object.
>
> I think i would prefer to use a pulse radar, which is legal on all of the
> amateur microwave bands except for 23 cm and 3cm. Does anybody know why?
> I would like to correspond with anybody sharing a similar interests.
>
> Viny Coppola N1VC
Hi Viny, I'm trying the same thing but only Doppler Speed so far on
10ghz.  Ended up on 10ghz ssb/cw and hilltopping but think the radar
aspect could be done with 1mhz or 10mhz square wave or triangle
and measuring phase delay on those modulated sigs right from mixer
out to sampler/detector.   1 mhz would give 150m distance and
10mhz would be good for 15 meters away.  Wd make neat low cost
Altimeter for Aircraft on ILS or Helicopter??
Will look for your messages on here.. 73 de Dave Riley AA1A


From [e-mail] Wed Oct 30 06:34:05 1996
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From: Philip Simpson <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.homebrew
Subject: Antenna Design
Date: Tue, 22 Oct 1996 21:43:18 -0700
Organization: UUNet PIPEX server (post doesn't reflect views of UUNet PIPEX)
Lines: 12
Message-ID: <[e-mail]>
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Hello,

I would be grateful if any kind DXer's would kindly forward various
articals on both antenna design and manufacture, my main areas of intrest
include, anything from begineer designs thru novice to advanced designs.

Thank-you in anticipation


73's Phil

Please respond direct to e-mail address.


From [e-mail] Wed Oct 30 06:34:07 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!news.nts-online.net!news
From: James Lee Tabor <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.homebrew
Subject: Re: Antenna Design
Date: Wed, 23 Oct 1996 12:15:26 -0500
Organization: Kangaroo Tabor Software
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]>
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Philip Simpson wrote:
>
> Hello,
>
> I would be grateful if any kind DXer's would kindly forward various
> articals on both antenna design and manufacture, my main areas of intrest
> include, anything from begineer designs thru novice to advanced designs.

CAPMan - The recognized leader in HF propagation prediction software
using the
proven IONCAP engine. CAPMan is a mature package for amateur and
professional
alike featuring advanced system analysis.

CAPMan is excellent for system analysis, meaning in part that it
really shines for use in learning how a particular antenna will
work under real world conditions.

Good Luck,
Jim
--
CAPMan HF Propagation Prediction & System Analysis Software
http://ourworld.compuserve.com/homepages/KU5S


From [e-mail] Wed Oct 30 06:34:07 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!aanews.merit.net!monroe.lib.mi.us!news
From: Dan Metzger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: antenna tuner design
Date: Fri, 25 Oct 1996 19:03:49 +0000
Organization: Monroe County Library
Lines: 6
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
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To: [e-mail]

> antenna tuner to build

I've got an MFJ tuner that works very well.  It's basically a T
network with about 220 pF in each arm of the T, and a big air-wound
coil with a lot of taps from the center of the T to ground.
 Dan, K8JWR


From [e-mail] Wed Oct 30 06:34:08 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-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Tim TJ)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: antenna tuner design
Date: 26 Oct 1996 22:06:01 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <54ug29$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Tim TJ)
NNTP-Posting-Host: newsbf02.mail.aol.com

What type of tuner are you interested in building?  There are many
different circuits available depending upon your needs.  Do you intend to
use open wire feedline, coax, or just a random length of wire?  If you
want to be able to switch between different types of feedline, then the
switching circuitry will probably become the most complicated part of the
desing.  I suggest checking out any edition of the ARRL Handbook or
Antenna Book for options.


From [e-mail] Wed Oct 30 06:34:09 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in2.uu.net!munnari.OZ.AU!news.uwa.edu.au!yarrow.wt.com.au!usenet
From: [e-mail] (Uncle)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: antenna tuner design
Date: Tue, 29 Oct 1996 23:50:45 GMT
Organization: Winthrop Technology
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: net15.nw.com.au
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On Thu, 24 Oct 1996 00:40:52 -0500, Paul Butler
<[e-mail]> wrote:

+I am looking for some schematics on antenna tuners that can be built.
If
+anyone knows of any please let me know.
+Paul Butler-- de AB5TD
+73's

Long time ago, lived where a beam was out of the question,
built up the SPC from the League handbook.  I was lucky,
had very widely spaced variable. (Easy enough nowadays
to get vacuum variables), coil from an ARC5.

Thought it was a bit tetchy, rewired it to std pi-net.
By the end of the week went right back to SPC.

Uncle Brian  VK6BQN

    -    -    -    -
Life isn't meaningless, it just has a poor signal to noise ratio.


From [e-mail] Wed Oct 30 06:34:10 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-pen-15.sprintlink.net!world1.bellatlantic.net!news2.cais.net!news.cais.net!www.nntp.primenet.com!nntp.primenet.com!newspump.sol.net!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!munnari.OZ.AU!news.uwa.edu.au!yarrow.wt.com.au!usenet
From: [e-mail] (Uncle)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Any mod servers on the web?
Date: Tue, 29 Oct 1996 23:50:48 GMT
Organization: Winthrop Technology
Lines: 16
Message-ID: <[e-mail]>
References: <54olmc$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: net15.nw.com.au
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On 24 Oct 1996 21:05:16 GMT, "Daniel Lavoie" <[e-mail]> wrote:

+I was wondering if there is any mod server on the web?  I got my
TS-50
+modified when it first came out, now that I'm on the internet I want
to
+know if there is any other mods available.
+
+Daniel
+VE3DCL
+
Well did you do the obvious?  A websearch?
Look thru the newsgroups (Dejanews) as well.

    -    -    -    -
Life isn't meaningless, it just has a poor signal to noise ratio.


From [e-mail] Wed Oct 30 06:34:11 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: atv
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]>
Date: Tue, 22 Oct 1996 19:06:41 GMT
Lines: 8
Sender: [e-mail]

in <[e-mail]>, bob wrote:
: Hi I'm trying to locate an article on how to build a atv transmitter in
: the 440 rage.   (the arrl blew it again.)

Electronics Now magazine, July and August, 1994.

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



From [e-mail] Wed Oct 30 06:34:12 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!EU.net!www.nntp.primenet.com!nntp.primenet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!in3.uu.net!newsgate.div.melpar.esys.com!uunet!in2.uu.net!news.callamer.com!spork.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: atv
Date: Fri, 25 Oct 1996 14:05:21 -0700
Organization: Call America Internet Services  [phone]
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: spork.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]
In-Reply-To: <[e-mail]>

Don't forget to check QST for November.  There is a complete construction
article there.  In this case the ARRL did NOT blow it!  Cliff K7RR

On Tue, 22 Oct 1996, Mark Zenier wrote:

> in <[e-mail]>, bob wrote:
> : Hi I'm trying to locate an article on how to build a atv transmitter in
> : the 440 rage.   (the arrl blew it again.)
>
> Electronics Now magazine, July and August, 1994.
>
> Mark Zenier  [e-mail]  [e-mail]
>
>
>



From [e-mail] Wed Oct 30 06:34:13 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!super.zippo.com!zdc!news.onramp.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV 420/430 Mhz receive only beam antenna?
Date: 21 Oct 1996 15:51:57 GMT
Organization: OnRamp Technologies; ISP;  Dallas/Ft Worth/Houston, TX USA
Lines: 11
Message-ID: <54g66t$[e-mail]>
NNTP-Posting-Host: hou20.onramp.net
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Does anyone have some good drawings on homebrew 420/430 Mhz
ATV receive beam antenna?

Please e-mail: [e-mail]
or post here.

Thank you for responding.

Paolo - KC5VPV




From [e-mail] Wed Oct 30 06:34:15 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!news.io.com!news.fc.net!paranoia.com!filipg
From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Best CB's?
Followup-To: rec.radio.amateur.homebrew
Date: 29 Oct 1996 14:57:45 GMT
Organization: TLJ Consulting
Lines: 33
Sender: [e-mail]
Message-ID: <555619$[e-mail]>
References: <54ecrs$[e-mail]> <[e-mail]>
NNTP-Posting-Host: primus.paranoia.com
Summary: haha

In Article <[e-mail]>, through puissant locution, Adriaan <adpe1kh
[e-mail]> soliloquized:
>[e-mail] wrote:
>> Can anybody suggest a good quality brand and model handheld CB?  My
>> main criteria is sound and quality.
>
> The Best CB-set is that one without a Vol, speaker and a antenna.

Greetings. "ha ha".. right. While that may be amusing to you, I am
looking into getting a few CBs (portable jobs) for use during
multi-car trips. This last trip was the end of my patience. It's
either a CB in every car or I'm not going on another one of those.

You would, instead, suggest that everyone get a HAM license and
a $400 transceiver... right? Dream on. The fact is that you use the
right tool for the job. Most [snob] mechanics scoff at Chinese
tools... and forget that I can weld those six $0.99 "vice-grips" into
a custom tool that they can't even imagine.

[sigh]

WANTED:

Anyone want to unload some cheap hand-held CBs? I just need about
1 mile range... often less. 12V cord is a plus. Doesn't need 40
channels. Identical units a plus too. Budget, $35-45/unit. Any
recommendations?

Take care.
--
+-->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] Wed Oct 30 06:34:18 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!netnews.worldnet.att.net!newsadm
From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Best CB's?
Date: Wed, 30 Oct 1996 00:22:01 -0800
Organization: http://geocities.com/capecanaveral/3722
Lines: 29
Message-ID: <[e-mail]>
References: <54ecrs$[e-mail]> <[e-mail]> <555619$[e-mail]>
NNTP-Posting-Host: 48.atlanta-005.ga.dial-access.att.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01E (Win16; I)

I would like to hear a serious answer.  I have been a homebrewin' ham off
 and on since '62  but know nothing about cb brand/quality.  What I wish
to know is what rig might be found at a low price and work well as an IF
(SSB) for my homebrew transverters. ...Woody


Filip M Gieszczykiewicz wrote:
> In Article <[e-mail]>, through puissant locution, Adriaan <adpe1
[e-mail]> soliloquized:
> >[e-mail] wrote:
> >> Can anybody suggest a good quality brand and model handheld CB?  My
> >> main criteria is sound and quality.
> >
> > The Best CB-set is that one without a Vol, speaker and a antenna.
> ...SNIP...
Greetings. "ha ha".. right. While that may be amusing to you, I am
> looking into getting a few CBs (portable jobs) for use during
> multi-car trips. ...SNIP...
> +-->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.

--
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] Wed Oct 30 06:34:21 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!mr.net!news.mr.net!news.Spacestar.COM!news
From: "glenn schultz" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.boatanchors,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,rec.radio.b
Subject: Re: CASH FOR RADIO SUPPLIES
Date: 30 Oct 1996 02:52:15 GMT
Organization: Spacestar Communications, Minneapolis, MN, USA
Lines: 31
Message-ID: <01bbc607$6bddf680$2993dccc@default>
References: <01bbc483$d2664c20$8c74d4cd@default>
NNTP-Posting-Host: tc12-16.msp.spacestar.net
X-Newsreader: Microsoft Internet News 4.70.1155
Xref: news1.epix.net rec.radio.amateur.antenna:30717 rec.radio.amateur.boatanchors:296 rec.radio.amateur.digital.misc:19846 rec.radio.amateur.dx:1164 rec.radio.amateur.equipment:41405 rec.radio.amateur.homebrew:20590 rec.radio.amateur.misc:117195 rec.radio.amateur.policy:42413 rec.radio.amateur.space:8678

Conrad R. Dery, Jr. <[e-mail]> wrote in article
<01bbc483$d2664c20$8c74d4cd@default>...
> Take a few minutes and read this.  It could change your life!!!!
>
> This is your chance to earn BIG BUCKS
>
> This is for real....no gimmicks!!!
>
> I read this article from a news group telling me I could make $50,000.00
in
<snip>

Conrad,
Do you realize that this scheme is called Wire Fraud and Mail Fraud? Most
everyone else does that reads this crap. ESPECIALLY with such a misleading
title and the fact that it was cross-posted to 10 different NG's! A message
has been sent to your ISP notifying them of your actions, along with copies
to the FCC and US Postal Service. KEEP THIS CRAP OUT OF OUR NEWS-GROUPS!
--
Glenn Schultz
10X 68391
N0VYK

interNET       ==>>  [e-mail]
packetNET   ==>>  [e-mail]

Check out the Ionospheric Protection League
Amateur and Antique Radio Homepage
==>>   http://www.spacestar.net/users/glenn/index.html




From [e-mail] Wed Oct 30 06:34:22 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!dispatch.news.demon.net!demon!xara.net!emerald.xara.net!Aladdin!Interalpha!usenet
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Catalog by Farnell - do you have phone#?
Date: Wed, 23 Oct 1996 19:15:33 -0700 (PDT)
Organization: Inter@lpha Net
Lines: 17
Message-ID: <54lnu3$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sot-mod15.interalpha.co.uk
X-Newsreader: Forte Free Agent v0.38

[e-mail] (David Feldman) wrote:

>I'm trying to find a catalog vendor by the name of "Farnell". Does anyone
>have their catalog? What is their phone number?

>Thanx,

>73 Dave WB0GAZ [e-mail]

Their Phone number in the UK is

[phone]
Farnell have just taken over Newark Electronics, giving us access to
their  whole range.
73  Andy  G4JNT




From [e-mail] Wed Oct 30 06:34:24 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!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (JOHN F. McCLUN)
Newsgroups: rec.radio.amateur.homebrew
Subject: CB to 10 conversions
Date: 22 Oct 96 15:09:16 GMT
Organization: UNIVERSITY OF MD DENTAL SCHOOL
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Dean, KC5NG-
  Dean, since the type exceptance done by the FCC on CB's a few
years ago, what is the:
    1.  Best rig to convert? ( i.e. gives the most features such as
memory, etc.)
    2.  The cheapest to convert? ( just change a cheap PLL crystal or a
chip)
     3.  The easiest? ( all parts identifiable and visable)

I have been thinking about a CB to 10 for the coming sunspot activity
and would appreciate any input to answer these questions, any
suggestions?

73 - 72 ( feelow QRPer)
John  <N3REY>
Always QRP!


From [e-mail] Wed Oct 30 06:34:25 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news
From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB to 10 meters?  anybody ever do it?
Date: 21 Oct 1996 18:01:34 GMT
Lines: 65
Distribution: world
Message-ID: <54gdpu$[e-mail]>
References: <5409e9$[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

In article <5409e9$[e-mail]>, [e-mail] says...
>
> Sorry to post here, it seems like the only place to post this sort of
> thing.

This IS the correct place for this question.

> Did anybody ever convert a CB to 10 meters?

I've converted DOZENS of them over the years.

> Is it easily done?

Yes, if you know what you're doing.  You didn't say what kind you have,
and what you want to do with it.

> (nothing is ever easily done, but is it easier than making Hillary
> Clinton a nice lady?)

No comment... I'm a Republican... take a guess at my opinion!  ;)

> It is going to need retuned to go to those freqs,

Yes, alignment of the VCO, receiver front end, and transmitter chain is
required after conversion, but this is not difficult to accomplish, IF
you know what you're doing.

> but you've also got to get rid of that 40 channel knob as far as tuning
> goes.  How do you tune the band?

You just use the 40 channel knob.  You could build a VFO, but it's not
worth the trouble.  If you want VFO tuning, buy an HR-2510, HTX-100, or
something along those lines.

> Any help would be greatly appreciated... 73s  Tyler N3SPD

Locate someone (another ham, library, etc) who has a good collection of
"73" magazine.  Search the issues from about 1976 through about 1984 or
so (give or take a couple of years).  They ran a continuing series of
articles entitled "CB To Ten".  See also QST, August 1981, plus other
issues, and other magazines.  In general, this sort of thing became a
popular thing to do about 1980 +/- a couple of years.  There is a store
in Arizona called CBCI (that stands for CB City International).  It is
run by Lou Franklin, K6NH, a long-time bootleg CBer who caters to other
bootleg CBers, but expanded his product line to suck in the hams.  His
prices (when I checked a few years ago) were really OBSCENE, but he has
a very complete product line with virtually anything you could want to
modify a CB radio.  Look in any recent issue of QST for his ad.  If you
can find the Sams Photofacts book on your CB, buy it.  The information
is invaluable, and the schematics are large and easy to read.

Other questions?  email me privately.

--
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] Wed Oct 30 06:34:26 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!newsxfer2.itd.umich.edu!howland.erols.net!news.sprintlink.net!news-stk-200.sprintlink.net!news.sprintlink.net!news-pen-14.sprintlink.net!ratty.wolfe.net!usenet
From: Ramon Gandia <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB to 10 meters?  anybody ever do it?
Date: Tue, 22 Oct 1996 04:28:07 -0800
Organization: Anvil Technology
Lines: 21
Message-ID: <[e-mail]>
References: <5409e9$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: nome-ts1-p01.nome.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; I)

tyler wrote:
>
> Sorry to post here, it seems like the only place to post this sort of hting.
> Did anybody ever convert a CB to 10 meters?  Is it easily done?  (nothing is
> ever easily done, but is it easier than making Hillary Clinton a nice lady?)
> It is going to need retuned to go to those freqs, but you've also got to get
> rid of that 40 channel knob as far as tuning goes.  How do you tune the band
?
>

Syhthetized ones are tough to convert.  Donate it to Goodwill or
the Salvation ARmy, get a nice tax deduction for it, and then
with the help of husband Billy Boy the Bozo and his tax plan,
go buy a nice, new FT-707 or 706.  Heh heh.

--
In order to foil SpamBots, my e-mail address is not
machine readable.  Please reply to address below:

Ramon Gandia,    Nome, Alaska  |    rfg.at.nome.dot.net
AL7X          S/V Seven Stars  |
907-443-2437 fax [phone]  | where at=@  dot=period


From [e-mail] Wed Oct 30 06:34:27 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: CMOS Super Keyer technical info?
Message-ID: <[e-mail]>
Sender: [e-mail] (System Administrator)
Mime-Version: 1.0
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
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Date: Tue, 29 Oct 1996 21:29:30 GMT
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Content-Transfer-Encoding: 7bit
Lines: 29

Hey gang I just looked through archive articles for some
information on the Super Keyer from Idiom Press.  I found
lots of people who were pleased with the product in its
various forms, but not a word about modifying the keyer
for use with a grid-block transmitter, or for relay output
so it can be used for both grid-block and direct transmitters.

I got mine second-hand and it did not come with any technical
information at all; the tutorial and user manual are mostly
concerned with the command set, etc.  For all
I know it can be configured at assembly time for either
keying method, but that information would only be covered in
the construction article which I don't have.  In any event, I
would like to modify the keyer to give it a relay output so I
can switch easily from one rig to another without worrying
about whether it's grid-block or direct, the relay to be
powered from an external source so the battery does not run
down.  For this I need to know the current handling ability
of the keyer's output transistor so I don't fry it.

Does anyone here have this information?

Please reply,

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




From [e-mail] Wed Oct 30 06:34:28 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.voicenet.com!netnews.upenn.edu!news.misty.com!www.nntp.primenet.com!nntp.primenet.com!news.primenet.com!markem
From: [e-mail] (Mark E. Monninger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CMOS Super Keyer technical info?
Date: 29 Oct 1996 15:36:01 -0700
Organization: PrimeNet
Lines: 8
Message-ID: <5560sh$[e-mail]>
References: <[e-mail]>
X-Posted-By: markem@206.165.5.109 (markem)

There was something in QST a couple months ago about mods to the CMOS
keyer to handle toob-type rigs...think it was in Hints & Kinks. Also,
the Handbook has some circuits to do it in the section with the keyer
projects...both solid-state & using a relay.

Hope this helps...

73...   Mark   AA7TA


From [e-mail] Wed Oct 30 06:34:29 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!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (John T Chasteen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Copy Manual VF-1 ( Heatn VFO )
Date: 22 Oct 96 14:30:10 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hello All

I have a DX-40 Xmitter and VF-1  VFO .
Deake 2B Receiver
Problem.... I need a copy of the manual for the VFO.
                     Would really appreciate a copy of the
          Heath construction manual.

         It would be nice to have a copy of operators
         manual  for the Drake Receiver.

I want to be ready to start work on my  old BA equioment
just as soon as I take the Gen. License Exam.

Thanks for your help.
EX W9YWP  near Chicago
73   John

[e-mail]


From [e-mail] Wed Oct 30 06:34:30 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!southwind.net!usenet
From: [e-mail] (Mike Foley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Diagrams from old radio mags
Date: 27 Oct 1996 18:11:26 GMT
Organization: Your Organization
Lines: 3
Message-ID: <5508ke$[e-mail]>
NNTP-Posting-Host: ppp22.hit.net
X-Newsreader: WinVN 0.91.6

I have some old radio mags from 1941 that have receiver and xmtr
circuits if any one is interested.  11 tube rcvrs, 6L6 xmtrs and the
like.


From [e-mail] Wed Oct 30 06:34:31 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!btnet!btinternet!usenet
From: Elizabeth Fleming <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: DSP
Date: Thu, 24 Oct 1996 19:15:21 -0700
Organization: Cleveland Tertiary College
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: clter.cleveland.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I)

Hi,
   Does anyone know where i can get some Digital Signal Proccesing
software from for nothing.

I Would be grateful for any assitance.

Guy.


From [e-mail] Wed Oct 30 06:34:31 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!btnet!btinternet!usenet
From: Guy Gent <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: dsp
Date: Thu, 24 Oct 1996 19:17:46 -0700
Organization: Cleveland Tertiary College
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: clter.cleveland.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I)

Hi, does anyone out there know where i may be able to get some DSP
software for free?

Guy.


From [e-mail] Wed Oct 30 06:34:32 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.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: DSP
Date: 25 Oct 1996 15:13:25 GMT
Organization: IdeaSource
Lines: 13
Message-ID: <54qlel$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 222.229.249.54
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12(Macintosh; I; PPC)
X-URL: news://newsgate/[e-mail]

Check out the comp.dsp newsgroup.

Also, the Motorola DSP home page has some ftp-able software for its
DSP chips.

http://www.mot.com/SPS/DSP/
http://www.motorola-dsp.com

http://www.mot.com/pub/SPS/DSP/LIBRARY/

The other DSP manufacturers may have similar resources.




From [e-mail] Wed Oct 30 06:34:33 1996
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From: Kovacs Karoly <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DSP
Date: Fri, 25 Oct 1996 09:46:27 +0200
Organization: Siemens AG Austria
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Dear Liz,

The following URLs are nice:

http://www.eg3.com/dsp.htm
http://www.nitehawk.com/rasmit/dsp50.html
http://www.ncc.com/misc/dsp_sites.html

http://www.tapr.org/tapr
http://www.mot.com/SPS/DSP/home/prd/ovr/DSP56002.html
http://www.brad.ac.uk/~rabooth/dsp.htm

73: Karoly (HA2EOF)


From [e-mail] Wed Oct 30 06:34:34 1996
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From: Michael Black <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DSSB from QRP Notebook
Date: Tue, 29 Oct 1996 12:40:15 -0500
Organization: Libertel de Montreal/Montreal Libertel
Lines: 57
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References: <552gs7$[e-mail]>
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In-Reply-To: <552gs7$[e-mail]>

What circuit are you talking about?  Is it the Phasing SSB rig on page
164, or something else in the book?

The problem that you might be having is that your test setup is unable
to notice the null.  A sensitive receiver near the actual transmitter
might be picking up the carrier oscillator directly, so no matter how
much you try to null the carrier, it sounds like nothing is happening.

I recall this happening to me years and  years ago.  I used a similar
setup, and nulling the carrier was a problem.

Try using an rf voltmeter of some kind (a scope, a real RF voltmeter,
a VOM with a diode detector, or even a sensitive panel meter
fed from a diode detector), on the output of the balanced modulator.
I think this will show a null.

If it doesn't, then you have to go back and look at what might
be imbalanced in the balanced modulator.  Such as the coil winding,
components feeding the circuit, etc.  The carrier balance control(s)
are there to overcome slight imbalance in these things, but if for
some reason something else is grossly incorrect, then it may not
have enough range to overcome the imbalance.

Also, layout can affect balance.  It shouldn't make the difference
between no balance and some balance, but once you get some balance,it
will effect the extent of the null that you can get.

   Michael  VE2BVW

On 28 Oct 1996, Tim Hynde wrote:

>
> I built the DSSB generator from the QRP Notebook, works great but I can't
> seem to null the carrier at all. For testing purposes I tapped off the
> oscilator in my newly finished DC reciever and used that as the LO to feed
> the DSSB circuit I took the output of the DSSC and fed it directly to the
> input of an old DX-150 reciever tuned to the correct freq.
>
> While tuning the oscilator of the DC Reciever I could hear it in the DX-150
> very strong of course. I turned up the mic gain in the DSSB circuit and
> voila Im making double sideband, I tuned the balance pot back and fourth but

> the carrier didn't change one iota. The diodes in the balanced modulator
> were measured for the same resistance but even if they were off I would
> think the 250 ohm trimmer would make SOME difference.
>
> Any thoughts?
>
> Has anyone else built this circuit and put it on the air?
>
> Regards and thanks,
>
> Tim, ka8ddz
>
>
>




From [e-mail] Wed Oct 30 06:34:35 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: DSSB from QRP Notebook
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <552gs7$[e-mail]>
Date: Tue, 29 Oct 1996 19:45:02 GMT
Lines: 28

In article <552gs7$[e-mail]> [e-mail] (Tim Hynde) writes:
>
>I built the DSSB generator from the QRP Notebook, works great but I can't
>seem to null the carrier at all. For testing purposes I tapped off the
>oscilator in my newly finished DC reciever and used that as the LO to feed
>the DSSB circuit I took the output of the DSSC and fed it directly to the
>input of an old DX-150 reciever tuned to the correct freq.
>
>While tuning the oscilator of the DC Reciever I could hear it in the DX-150
>very strong of course. I turned up the mic gain in the DSSB circuit and
>voila Im making double sideband, I tuned the balance pot back and fourth but
>the carrier didn't change one iota. The diodes in the balanced modulator
>were measured for the same resistance but even if they were off I would
>think the 250 ohm trimmer would make SOME difference.
>
>Any thoughts?

Sure, you're still hearing the DC receiver's LO *directly*, so of
course you can't hear the carrier null of the DSB unit. Indicate
the null with an RF probe directly on the DSB unit output.

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] Wed Oct 30 06:34:36 1996
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From: Glenn McAllister <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DSSB from QRP Notebook
Date: Wed, 30 Oct 1996 14:56:08 +1200
Organization: Delta-Wye Electronics
Lines: 31
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Tim Hynde wrote:

> I built the DSSB generator from the QRP Notebook, works great but I can't
> seem to null the carrier at all. ((snip))
> I took the output of the DSSC and fed it directly to the
> input of an old DX-150 reciever tuned to the correct freq.
>
> While tuning the oscilator of the DC Reciever I could hear it in the DX-150
> very strong of course. ((snip))
>
> Any thoughts?

Don't know how sensitive the DX150 receiver is or what the output level
is
from the DSB module, but don't you think plugging the exciter directly
into the receiver input might just overload it a tad??  Assuming a
conservative -10dBm from the exciter, even if you achieve an unrealistic
40dB carrier suppression from the exciter, the receiver will still be
getting
S9+ on the suppressed carrier!

How about sheilding the exciter and adding some extra 30dB or so
attenuation
between the exciter and receiver.  (free space works well)

> Regards and thanks,
>
> Tim, ka8ddz

73 de Glenn, ZL2TLD
Sunny Wellington, New Zealand


From [e-mail] Wed Oct 30 06:34:37 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.nap.net!news1!PAT
From: [e-mail] (Patrick Croft)
Subject: Re: Ethernet Coax for ham use
X-Nntp-Posting-Host: ind-004-236-172.iquest.net
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References: <[e-mail]> <[e-mail]> <01bbb729$7b7dba40$d6122399@peter-s> <541pkr$[e-mail]>
Date: Fri, 18 Oct 1996 22:37:14 GMT
Lines: 10

In article <541pkr$[e-mail]>,
   [e-mail] (Tony White) wrote:
>>I don't have my catalogs hadny, but I have heard of hams using this
>>stuff with some success.  I don't recall any numbers on loss but I think
>>the stuff was around 50 Ohms.
>
>It is exactly 50 ohms.  I use it for VHF/UHF receivers, but I wouldn't dare
>transmit on it -- at least with over 25w power.  I'd use RG/8-U instead.
>
Will handle KiloWatt - just  not rated.


From [e-mail] Wed Oct 30 06:34:38 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newspump.sol.net!howland.erols.net!netcom.com!wa2ise
From: [e-mail] (Robert Casey)
Subject: Re: Ethernet Coax for ham use, thicknet same as RG8 + more shielding
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
References: <01bbb729$7b7dba40$d6122399@peter-s> <541pkr$[e-mail]> <548tcq$[e-mail]>
Date: Mon, 21 Oct 1996 17:28:20 GMT
Lines: 18
Sender: [e-mail]

In article <548tcq$[e-mail]> [e-mail] (Patrick Croft) writ
es:
>In article <541pkr$[e-mail]>,
>   [e-mail] (Tony White) wrote:
>>>I don't have my catalogs hadny, but I have heard of hams using this
>>>stuff with some success.  I don't recall any numbers on loss but I think
>>>the stuff was around 50 Ohms.
>>
>>It is exactly 50 ohms.  I use it for VHF/UHF receivers, but I wouldn't dare
>>transmit on it -- at least with over 25w power.  I'd use RG/8-U instead.
>>
>Will handle KiloWatt - just  not rated.

The low voltage markings on the ethernet thicknet coax is just to make
the fire inspectors happy, that serious power would not be piped thru
it when used in office buildings.  That it could be strung thru the
ceiling without being enclosed in conduit.  In ham use it can handle
whatever foamed RG8 can handle.  Inspect it for vampire tap holes
though.


From [e-mail] Wed Oct 30 06:34:39 1996
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From: [e-mail] (Joey Solomon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Free money
Date: 22 Oct 1996 21:38:40 GMT
Organization: SEFLIN Free-Net - Broward
Lines: 18
Message-ID: <54jet0$[e-mail]>
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X-Newsreader: TIN [version 1.2 PL2]

Well now that I have your attention, I need schematics, for any thing and
everything.  I just started my ham shack.  So EM me back. KF4MKU standing by.

--
KF4MKU
 /\/\/\/\
|       |
| () () |  DUH?
|   _\  |
|       |
|  \__/ |
\       /
 \_____/     73's and have a nice day :-)



(Joey Solomon)
[e-mail]


From [e-mail] Wed Oct 30 06:34:40 1996
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From: Steve Simpson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Free money
Date: Wed, 23 Oct 1996 17:47:22 +0100
Organization: Chubby Programming
Lines: 22
Distribution: world
Message-ID: <[e-mail]>
References: <54jet0$[e-mail]>
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In article <54jet0$[e-mail]>, Joey Solomon <a043971t@bc
freenet.seflin.lib.fl.us> writes
>Well now that I have your attention, I need schematics, for any thing and
>everything.  I just started my ham shack.  So EM me back. KF4MKU standing by.
>
>--

You might like to think again before posting a message with a title like
"Free Money"!!

Most people will ignore it and some people have their systems set up to
delete them on download.

It won't attract anyones attention it will just piss them off.

Regards
--
Steve "Chubby" Simpson
HTML Programmer/Night Club D.J.
[e-mail]
G7NAY@GB7MSW.#33.GBR.EU
HTTP://www.chubs.demon.co.uk


From [e-mail] Wed Oct 30 06:34:41 1996
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From: [e-mail] (Tim Hynde)
Newsgroups: rec.radio.amateur.homebrew
Subject: Front end for DC RX
Date: 28 Oct 1996 14:33:37 GMT
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Now that I've got a couple DC recievers under my belt. I'd like to know:

How can I improve the sensitivity of one built for 80m? Does putting a
pre-amp in front get you anything on the lower bands?

The tuned circuit I have for the front end calls for a cap across the coil
with a trimmer to bring it in. I found that using a 100pf trimmer brings it
into tune at both 10 o'clock and 2 o'clock. I assume then that it is within
the correct range.

Since the author called out to use a smaller trimmer (50 pf) and a fixed
value across the coil I assume he was trying to make the tuning easier by
not having such sharp peaks with a higher value trimmer. Am I on track with
this? Does it matter as long as the trimmer peaks at two points.


73, Tim
ka8ddz Rochester Hills, MI



From [e-mail] Wed Oct 30 06:34:42 1996
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From: [e-mail] (John Kolb)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Front end for DC RX
Date: 28 Oct 1996 23:49:10 GMT
Organization: CTS Network Services (CTSNET), San Diego, CA
Lines: 28
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References: <552g81$[e-mail]>
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Tim Hynde ([e-mail]) wrote:

: The tuned circuit I have for the front end calls for a cap across the coil
: with a trimmer to bring it in. I found that using a 100pf trimmer brings it
: into tune at both 10 o'clock and 2 o'clock. I assume then that it is within
: the correct range.

The clock positions are dependant on how you locate the knob.
As the variable cap is turned through 360 degrees, it will vary from
a minimum C value, to a max C 180 degrees later, back to a min. You
get two peaks because you pass through the same capacitance twice.
If you had only one peak, with the cap plates fully meshed or completly
open, it would mean you were not reaching resonance, and needed either
more or less inductance in the paralleled coil.

: Since the author called out to use a smaller trimmer (50 pf) and a fixed
: value across the coil I assume he was trying to make the tuning easier by
: not having such sharp peaks with a higher value trimmer. Am I on track with
: this? Does it matter as long as the trimmer peaks at two points.

Correct. Doesn't matter except with the cap passing through resonance
faster, harder to get the exact peak, and you might loose just a touch
of performance.


73  John  KK6IL




From [e-mail] Wed Oct 30 06:34:43 1996
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From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Front end for DC RX
Date: Tue, 29 Oct 1996 12:12:57 -0800
Organization: Hewlett-Packard
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Tim Hynde wrote:
>
> Now that I've got a couple DC recievers under my belt. I'd like to know:
>
> How can I improve the sensitivity of one built for 80m? Does putting a
> pre-amp in front get you anything on the lower bands?
>
> The tuned circuit I have for the front end calls for a cap across the coil
> with a trimmer to bring it in. I found that using a 100pf trimmer brings it
> into tune at both 10 o'clock and 2 o'clock. I assume then that it is within
> the correct range.
>
> Since the author called out to use a smaller trimmer (50 pf) and a fixed
> value across the coil I assume he was trying to make the tuning easier by
> not having such sharp peaks with a higher value trimmer. Am I on track with
> this? Does it matter as long as the trimmer peaks at two points.
>
> 73, Tim
> ka8ddz Rochester Hills, MI


Hi Tim OM,

 A preamp will increase the sensitivity of the receiver.  Normally,
the atmospheric noise is high enough on the lower bands like 80M so
that it easily overrides the internal noise in the receiver.   A DC
receiver
with ring diode mixer front end will have a noise figure somewhere
in the 10-15 dB range.  IF the band is unusually quiet, this receiver
internal noise can be heard, and under those conditions, a preamp
can be helpful.  In other words, it does no good to amplify both
the signals and the atmospheric noise together; you just end up where
you started.  BUT, if the receiver's internal noise is dominant, then
adding additional gain in the front end with a low-noise preamp will
help the received sig/noise ratio, by reducing the receiver's noise
figure.  The price paid for increased sensitivity is reduced dynamic
range, making the receiver somewhat more susceptible to overload by
strong local signals.

  Hope this helps; all this is in various ARRL and other books on
receiver design and construction.

   73,
        Don,  W6JL


From [e-mail] Wed Oct 30 06:34:45 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!arclight.uoregon.edu!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Front end for DC RX
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <552g81$[e-mail]>
Date: Tue, 29 Oct 1996 21:02:51 GMT
Lines: 74

In article <552g81$[e-mail]> [e-mail] (Tim Hynde) writes:
>
>Now that I've got a couple DC recievers under my belt. I'd like to know:
>
>How can I improve the sensitivity of one built for 80m? Does putting a
>pre-amp in front get you anything on the lower bands?

If you're using a proper low noise first stage in the audio circuit,
an RF preamp won't help sensitivity (though it can reduce backwave
from the receiver LO, and that may be worthwhile). Generally, the
problem at lower HF is not too little sensitivity, it is too much,
IE the receiver overloads from strong nearby signals, or even rectifies
them in the mixer (a problem with AM broadcast signals). A good preselector
filter in front of the receiver can help a lot. It *may* be worthwhile
to have a high intercept RF preamp in the middle of the preselector
to overcome insertion loss, and to suppress the LO backwave as mentioned
previously. I'd suggest a 3 section ganged preselector (top coupled)
with the preamp between sections 2 and 3, IE closer to the mixer than
the antenna. The preamp shouldn't have high gain, 6 to 12 db would be
about right, and should be biased for a high standing current to improve
its intercept. A CATV line amp transistor works well here.

>The tuned circuit I have for the front end calls for a cap across the coil
>with a trimmer to bring it in. I found that using a 100pf trimmer brings it
>into tune at both 10 o'clock and 2 o'clock. I assume then that it is within
>the correct range.
>
>Since the author called out to use a smaller trimmer (50 pf) and a fixed
>value across the coil I assume he was trying to make the tuning easier by
>not having such sharp peaks with a higher value trimmer. Am I on track with
>this? Does it matter as long as the trimmer peaks at two points.

You get two peaks because the capacitor is at partial mesh near both
ends of its range, and gives you the same capacitance value at each of
those points. Ideally, the capacitor will be at the correct value when
exactly half meshed, thus the two peaks would be exactly 180 degrees of
shaft rotation apart. You're getting resonance closer together than that,
which is telling you that resonance is occurring at greater, or lesser,
than half mesh, IE the capacitor is a bit too large or too small to give
you the greatest bandspread (depending on whether it resonates at lesser
than half mesh or greater than half mesh in the middle of the frequency
range you want to tune, look and see).

Depending on whether the capacitor is too small or too big, you can
parallel or series fixed capacitance with it to get it to resonate
at exactly half mesh in the center of your tuning range. Having it
too small is best, and will give best bandspread and smoothest tuning
provided you still have enough range to resonate at both ends of the
desired tuning range (check that, you'd like the lowest end of the
frequency range to occur at near full mesh of the capacitor, and the
upper end of the range near the least mesh of the capacitor). It can
require a bit of juggling to get it right. You can remove plates
from a capacitor which is too big to get it in the right range, but
it can be hard to put them back, so be careful to test as you go.

The *shape* of the capacitor plates can matter too. There are two
styles available. One varies capacitance non-linearly with shaft
rotation while the other varies capacitance linearly with shaft
rotation. The former is preferred for broad tuning spans. The
latter tends to bunch up the tuning near one end of the range if
the tuning span is large. This is a nuisance when you want a linear
tuning dial. Unfortunately, the latter style is the one more commonly
encountered today in the smaller values. For narrow tuning ranges,
the linear type is satisfactory. You can tell them apart by looking
at the symmetry of the plate about the shaft. The linear type is
symmetric, the "straigt line tuning" type is not. This is the same
principle as linear and log taper (audio taper) pots.

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] Wed Oct 30 06:34:46 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!lynx.unm.edu!bubba.NMSU.Edu!not-for-mail
From: [e-mail] (beard)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: New 4CX1000A Socket
Date: 21 Oct 1996 17:53:40 GMT
Organization: New Mexico State University
Lines: 13
Message-ID: <54gdb4$[e-mail]>
NNTP-Posting-Host: acca.nmsu.edu
X-Newsreader: TIN [UNIX 1.3 950621BETA PL0]

I have a new 4CX1000A socket in original box.  $75.00 plus shipping.
I also have several practically new 4CX1000A tubes.  I built a
4CX1000A amp several years ago and acquired several brand new tubes that
have only been used in my amplifier.  I now live in a crowded
neighborhood and can no longer use the amplifier.  Let me know if you
are interested in the tubes and we will talk.

WA4QGA
David Beard
[phone] after 6 PM Monutain Time

73



From [e-mail] Wed Oct 30 06:34:47 1996
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From: [e-mail] (W6KKT Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Fri, 25 Oct 1996 13:31:21 GMT
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On 20 Oct 1996 22:11:47 -0400, [e-mail] (W8JI  Tom) wrote:

>In article <[e-mail]>, [e-mail] (Bill
>Turner) writes:
>
>>
>>If you're new at homebrewing amplifiers, you might want to check out
>AG6K's
>>web site for a lot of good information:
>>
>>http://www.vcnet.com/measures/
>>
>>There is some personal stuff in there, since the author feels he was
>treated
>>rather poorly by a well-known ham organization (I'm staying out of that),
>but
>>the technical advice appears to be first-rate.
>>
>>73, Bill W7LZP
>
>Hi Bill,
>
>First, all of Measures stuff was sent out by QST to several independent
>engineers for review.
>
>Unfavorable comments were received from a list that read like who's who in
>RF engineering. It included engineers at Harris, Collins, Eimac, NASA and
>many other places. Out of dozens of replys, not one was favorable.
>Measures uses his web page to lay blame on Dick Ehrhorn, QST, and even me.
>
>The only thing QST handled poorly was printing Measures flawed theories
>without proper review.
>
>I offered, and still offer, to debate Mr. Measures or his representative
>in an open forum on Internet or in any publication. The only restriction I
>require is we discuss one point at a time, and that both of us refrain
>from wild personal accusations about manufacturers, other people, or each
>other. In short, the only restriction is the debate be kept to technical
>issues, and not be full of personal attacks or wild conspiracy theories.
>
>I would advise anyone looking for "good" amplifier tips to read Eimac's
>"Care and Feeding of Power Grid Tubes, or many of the excellent articles
>from QST or the Handbook back when proper technical editing was in vogue
>and people understood tubes, like in the 70's and earlier.
>
>While many of Measures' suggestions are harmless, some are not. Some
>suggestions will put the user in harm's way, or cause equipment damage.
>I'd hate to see someone ruin a $500 tube, or worse yet hurt themselves,
>following poor advice.
>
>73, Tom

Tom, have you visited Measures web site?  Are you saying all his ideas
are wrong? If not, would you be more specific?  The only rf engineer I
know who is perfect is the self proclamed expert, "Kurt"!   I now
wonder if he wasn't the expert who designed and sold to Hams the
AL-80 with it's "state of the art "QSK" circuit?
73, Jesse, W6KKT


From [e-mail] Wed Oct 30 06:34:48 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 25 Oct 1996 16:30:37 -0400
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In article <[e-mail]>, [e-mail] (W6KKT
Jesse) writes:

>
>Tom, have you visited Measures web site?  Are you saying all his ideas
>are wrong? If not, would you be more specific?  The only rf engineer I
>know who is perfect is the self proclamed expert, "Kurt"!   I now
>wonder if he wasn't the expert who designed and sold to Hams the
>AL-80 with it's "state of the art "QSK" circuit?
>73, Jesse, W6KKT
>
>

Actually no, the responsible party was Denny Had of Dentron fame. While
Denny is a very nice guy, RF was not his area of expertise. The QSK in the
original AL-80 was a copy of Heathkits TR circuit in a two meter amp that
used 1/4 wl lines and a conventional diode. He saw the circuit, never
understood the theory, and stuck it in a HF amp.

Prime Instruments partially financed Denny to a new start (via parts and
tooling purchases) after Dentron went bust. I was hired to help Prime
produce amplifiers when the deal started to unravel. I ordered all the
original AL-80's recalled and rebuilt at Primes expense, the owner of
Prime, W8IOB, agreed. W8IOB is a wonderful guy, and very honest.

The AL-80 parts were run out until the AL80A was designed and produced, I
sold the kit rights to Heathkit, whom I also did consulting RF engineering
for. Heathkit changed the inrush, transformer and switch (leaving a corona
ring off) against my wishes.

So, that grouchy 70-some year young Kurt (who really isn't so bad when you
get to know him, even if he is "always right") had nothing to do with that
PA. It was a much more pleasant guy, Denny, with good intentions but who
unfortunately was not a "real" engineer.

In line with that thought, I'm not saying ALL the ideas on the Web page
you mentioned are wrong, but some are *very* bad from an engineering
concept. Many of the well intentioned suggestions will actually cause more
problems than they will correct. I'm sure the intentions are good, even if
the suggestions are not.

If I were you to point you to one reliable source, it would be Eimac's
Care and Feeding of Power Grid Tubes or other commercial engineering
texts. In commercial books, you have the benefit of people working in a
team, double checking each other. You are less likely to hear rumor or
folklore.

I'd be happy to discuss anything on the Web page one point at a time.
You'll find I can give good reason for anything I say (that can be
verified), rather than blaming disagreements on "coverups or
conspiracies".

73 Tom


From [e-mail] Wed Oct 30 06:34:49 1996
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From: [e-mail] (Jim Potter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Sat, 26 Oct 1996 03:38:13 GMT
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[e-mail] (W8JI  Tom) wrote:

>>In line with that thought, I'm not saying ALL the ideas on the Web page
>you mentioned are wrong, but some are *very* bad from an engineering
>concept. Many of the well intentioned suggestions will actually cause more
>problems than they will correct. I'm sure the intentions are good, even if
>the suggestions are not.
>
>If I were you to point you to one reliable source, it would be Eimac's
>Care and Feeding of Power Grid Tubes or other commercial engineering
>texts. In commercial books, you have the benefit of people working in a
>team, double checking each other. You are less likely to hear rumor or
>folklore.
>
>I'd be happy to discuss anything on the Web page one point at a time.
>You'll find I can give good reason for anything I say (that can be
>verified), rather than blaming disagreements on "coverups or
>conspiracies".
>
>73 Tom


I didn't wade through all the material, but I don't see anything
fundamentally wrong with de-Qing the tank circuit VHF resonances.
After all that's what the parasitic choke is doing. As long as the
tank circuit fundamental resonance unloaded Q is high compared to the
loaded Q, the tank losses are of little consequence. On the other hand
it may be redundant to use resistive leads and inductors and a shunt
resistor. I also remember seeing something about film resistors. I
guess I would prefer carbon composition or Carborundum resistors
myself.

de K9GXC, 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] Wed Oct 30 06:34:50 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 26 Oct 1996 10:35:37 -0400
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In article <[e-mail]>, [e-mail] (Jim
Potter) writes:

>
>I didn't wade through all the material, but I don't see anything
>fundamentally wrong with de-Qing the tank circuit VHF resonances.
>After all that's what the parasitic choke is doing. As long as the
>tank circuit fundamental resonance unloaded Q is high compared to the
>loaded Q, the tank losses are of little consequence. On the other hand
>it may be redundant to use resistive leads and inductors and a shunt
>resistor.

More than redundant, it's poor engineering. Here's why.

In a proper design the VHF path is primarily through the resistor, not the
suppressor's inductor. The inductor completes the HF signal path, not the
resistor. The best design would place the entire VHF path through the
dissipating resistor, and NONE of the desired HF energy through lossy
resistances.

This is especially a problem on ten and fifteen meters, where the output
capacitance of the tube is the majority of the input capacitance of the
tank. Using a lossy coil and leads now places unnecessary resistance in
the HF tank, de-Qing the tank at the operating frequency. This reduces
harmonic suppression as well as efficiency, and for no good cause at all
if the goal is suppression of VHF signals.

The correct approach is to design the circuit correctly in the first
place, rather than shotgun it with unnecessary losses that hurt desired
performance while not doing a thing for the undesired traits.

Why de-Q the HF path that doesn't affect VHF stability, when the primary
VHF path can very easily be made lossy with affecting the HF path?

> I also remember seeing something about film resistors. I
>guess I would prefer carbon composition or Carborundum resistors
>myself.

Myself also. If you cut open the film resistors that come with the
nichrome suppression kit, you will see the resistor element is wound in a
spiral around a ceramic form. This is the last thing you want in a
non-resonant VHF suppressor, because it adds series non-dissipative
inductance in the resistor path and forces the resistor OUT of the circuit
at higher frequencies, right where it is needed most. What a PA really
needs are the types of resistors you mentioned, carbon compositions or
Carborundum type non-inductive resistors.

Why go through the bother of changing parts just to stick the wrong type
components in? I don't call that an improvement or good advice.

73 Tom


From [e-mail] Wed Oct 30 06:34:51 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, 27 Oct 1996 16:14:53 -0700
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In article <54r81d$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

snip...
>
> If I were you to point you to one reliable source, it would be Eimac's
> Care and Feeding of Power Grid Tubes or other commercial engineering
> texts. In commercial books, you have the benefit of people working in a
> team, double checking each other. You are less likely to hear rumor or
> folklore.
>
Has Tom actually read the book he recommends?  Is this another case of do
as I say, not do as I do? ....... *Care and Feeding of Power Grid Tubes*
does Not discuss designing parasitic-oscillation suppressor devices.

 When I was talking to an Eimac engineer in  February, 1986, about
suppressing unwanted oscillations, he said that  even though they (Eimac)
discovered that  the reason for gold-sputtering damage in 8877s was an
oscillation condition, there were no Eimac Engineering Bulletins on the
subject.  He said that the job of designing devices to suppress such
oscillations was the responsibility of amplifier engineers, not electron
tube engineers .  He said:  "that's your job".

.....so I got out my dipmeter and started investigating.  Two years and
many experiments later, I wrote an article for QST, which was published in
October, 1988.  A followup article was published in the September and
October, 1990 QST.

Are lower Q VHF suppressors needed? Take a look at:
http://www.vcnet.com/measures/bandswitch%2C%20parasitic-arced
After receiving a new bandswitch and lower Q parasitic suppressors, this
(3) 8874 ETO amplifier was successfully returned to service.

 Another photo of a parasitic-arced bandswitch can be seen on page 33 of
"Parasitics Revisited" in the October 1990 issue of QST.  The bandswitch
was removed from a TL-922A.  After this article was published, Tom
telephoned me at the suggestion of QST's Paul Pagel.  Tom said that such
bandswitch arcing could be caused by "cheap coax".

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Wed Oct 30 06:34:53 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 29 Oct 1996 01:55:11 -0500
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Hi Rick,

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

>When I was talking to an Eimac engineer in  February, 1986, about
>suppressing unwanted oscillations, he said that  even though they (Eimac)
>discovered that  the reason for gold-sputtering damage in 8877s was an
>oscillation condition, there were no Eimac Engineering Bulletins on the
>subject.  He said that the job of designing devices to suppress such
>oscillations was the responsibility of amplifier engineers, not electron
>tube engineers .  He said:  "that's your job".

As I understand it, you were talking to Willis Foote. He was a
"specifications engineer" working in the customer return department, not a
design engineer.

If you call Eimac, you'll find gold sputting is a problem due to a variety
of causes, most of which are physical. The "parasitics thing" delt only
with heating in a very high power UHF TV transmitter tube, NOT the 8877.
That's why there was never a bulletin on the 8877 (or any other small
tube).

>.....so I got out my dipmeter and started investigating.  Two years and
>many experiments later, I wrote an article for QST, which was published
in
>October, 1988.  A followup article was published in the September and
>October, 1990 QST.

Why does a dip meter have to do with parasitics? Did you use the dip meter
as a wave meter?

> Another photo of a parasitic-arced bandswitch can be seen on page 33 of
>"Parasitics Revisited" in the October 1990 issue of QST.  The bandswitch
>was removed from a TL-922A.  After this article was published, Tom
>telephoned me at the suggestion of QST's Paul Pagel.  Tom said that such
>bandswitch arcing could be caused by "cheap coax".

The damaged switch could have been caused by a multitude of operating
problems, not just bad coax. Anything that unloads the tank circuit can
cause an arcing problem, as can selection of a component that simply is
inadequate for the job.

Voltage at the anode end of the tank can exceed the dc supply voltage by
many times if the tank becomes unloaded or improperly loaded. The ideal
condition for creating this effect is excessive loading capacitance and/or
a low Z termination of the tank output (with a pi-network).

This condition shortens the anode conduction angle to less than 180
degrees (if the original class is AB or lower angles) and allows the tank
to store energy, ringing the vltage up much like in a switching regulator.
Eventually, if equilbrium isn't acheived first in dissipative losses,
something gives.

The SB-220, when improperly loaded, can produce over 4 kV peak on the
input end of the tank. The tube peak anode voltage is over 7 kV. Until
something "gives" or the energy falls back in equilbrium, the voltage
builds. Unfortunately it is often the tuning capacitor or bandswitch that
arcs.

This effect can be measured and documented, it is not a matter guessing
the cause. The TL-922 is the same.

On the other hand, you would have everyone believe the VHF energy can
build up to a very high voltage across the very low VHF impedance of the
plate tuning capacitor, high enough to arc the switch over.  The real
effect of the capacitor and residual inductances is actually to step VHF
voltages DOWN, not up. After all, that's why the tank adds VHF harmonic
suppression.

Wouldn't a tank that fits your theories (allowing high VHF voltages, ie
high VHF bypass impedances) have very little VHF harmonic suppression? And
if so, how did it pass FCC tests with such marginal case shielding?

73, Tom


From [e-mail] Wed Oct 30 06:34:54 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 29 Oct 1996 11:42:19 -0500
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Hi Zak,

Parasitics occur for various reasons in various circuits, it is pretty
difficult to speak of solutions in Carte Blanche terms.

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

>       How about using ferrite beads over wires instead of resistors?
>I've heard reports that they are almost purely resistive at VHF.
Shouldn't
>the HF bypass choke keep the beads out of saturation if the system is
>properly designed?

First we have to understand why the oscillation occurs. In typical HF (and
lower) circuits using small power grid tubes (below 50 kW) , the problem
centers around the grid connections. At some frequency, the grid is no
longer a good shield. The grid, even though grounded, "looks like" it
floats for RF. Like any resonant circuit, the impedance generally peaks at
one frequency.

If the anode circuit happens to be resonant at the same frequency, the
tube can oscillate. The usual effect is much like a TPTG oscillator. The
suppression must be in the primary VHF signal path through the plate
tuning capaciator, not in series with the RF plate choke.

What we need to do is add some loading to one of the resonant circuits, so
the loss exceeds the gain. Once that is done, the stage becomes stable.

Since this is almost always (with a proper layout) a single frequency area
problem, we want to add as much damping as we can over the undesired
frequency range.

The problem with ferrites is the transition from inductive to resistive
behavior (loss of Q)  is generally very slow as frequency is raised. What
we want is an abrupt change, where loss is very low at desired operating
frequencies (allowing good efficiency) and suddenly the loss is very high
at the undesired frequency.

We also need a resistance in the suppressor that properly terminates the
anode. The ideal resistance depends on the impedance of the anode to
chassis path through the plate tuning capacitor. The higher the impedance
of that path, the larger the loading resistance needs to be. The impedance
transformation due to the anodes shunt capaciatnce and series inductance
also affects the ideal value of this load resistance.

In general terms, we want the anode to chassis path to be as short as
possible, since we want the lowest possible distributed resistance and
reactance at the operating freqiuency and above. This allows us to use a
small resistance value in the suppressor.

In the ideal case we would have the most rapid "insertion" of damping
resistance possible as frequency is increased, short wide grid leads and
short wide anode connections. All resitance should be concentrated at one
area so it can be adjusted to the correct value for maximum damping.

Different tubes tend to oscillate at different frequencies, tubes with
long grid structures and long internal leads tend to oscillate at 100 MHz
or lower, while other tubes like the 3CX1200Z7 and 8877 almost never
oscillate because system gain falls off well before the self-neutralizing
frequency is reached.

With a tube using long internal leads suppression is more difficult, since
the tendency to oscillate is often close to the operating frequency. For
example 572B's and 811A's try to oscillate below 50 MHz, often as low as
25 MHz in a poor layout. So if we wanted a stable amp we would have to use
a very large reactance in the suppressor.

Ferrites might work if the tube self-neutralizing frequency is far above
the operating frequency, but likely will not be the best choice in amateur
HF applications using tubes with grid resonances in the low to mid- VHF
range.

73 Tom



>
>       Or, stepping a little further back, how about a distributed
>design solution, perhaps with an integrated transmission line to reduce
>the unwanted parasitic elements?  After all, you do have to shield the
>amplifier anyway--why not integrate the shielding with the circuitry,
>instead of trying to make it invisible?
>
>



From [e-mail] Wed Oct 30 06:34:55 1996
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 29 Oct 1996 20:07:13 GMT
Organization: Hewlett-Packard
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In article <555c5b$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:
>
>In article <[e-mail]>, Zack Lau <[e-mail]> writes:
>
>>      How about using ferrite beads over wires instead of resistors?
>>I've heard reports that they are almost purely resistive at VHF.
>Shouldn't
>>the HF bypass choke keep the beads out of saturation if the system is
>>properly designed?
>
>The problem with ferrites is the transition from inductive to resistive
>behavior (loss of Q)  is generally very slow as frequency is raised. What
>we want is an abrupt change, where loss is very low at desired operating
>frequencies (allowing good efficiency) and suddenly the loss is very high
>at the undesired frequency.
>
>73 Tom
>

Another problem with ferrite beads is that they start to
saturate at a few hundred mA.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Wed Oct 30 06:34:56 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: <54e199$[e-mail]> <54em53$[e-mail]>
Date: Tue, 29 Oct 1996 22:20:06 GMT
Lines: 14

In article <54em53$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>While many of Measures' suggestions are harmless, some are not. Some
>suggestions will put the user in harm's way, or cause equipment damage.
>I'd hate to see someone ruin a $500 tube, or worse yet hurt themselves,
>following poor advice.

Well, don't leave us in the dark. Which suggestions are dangerous?

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] Wed Oct 30 06:34:57 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]> <555qnt$[e-mail]>
Date: Tue, 29 Oct 1996 22:16:51 GMT
Lines: 20

In article <555qnt$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>Early Dentrons had NO grid overload protection, as a matter of fact most
>had NO grid meter! They had high filament voltage, and poor cooling. They
>drove too easy, and had heater windings common to the high voltage
>transformer (making them prone to heater inrush damage). After seeing
>problems Heath had with an 8875-style (but conduction cooled) tube in the
>SB-230, it's a wonder any of these PA's survived amateur use. Not having a
>grid trip circuit or arc suppression in the anode was poor engineering.

Hmmm. I have a MLA2500. It hasn't blown up yet, and the tubes still
seem to have plenty of life in them. With replacement tube prices
being what they are, I'd like to keep it that way. I'm open to
suggestions as to life extending improvements.

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] Wed Oct 30 06:34:58 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!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #453
Date: 22 Oct 96 14:00:07 GMT
Organization: ucsd usenet gateway
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Does anyone know where I can get schematics for VGA monitors? The company I
consult for uses them on small boats and they get lots of pounding and
vibration. I put 2 in the trash yesterday. I could repair them and give them
away or save a few bucks. Also SMPS used in PC's (250 to 500 watts). Should be

good for something in the shack! I have disposed of at least a dozen monitors
in the past year. $250 $300 a pop adds up quick.
spencer trombly
[e-mail]



From [e-mail] Wed Oct 30 06:35:00 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!news.io.com!news.fc.net!paranoia.com!filipg
From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #453
Followup-To: rec.radio.amateur.homebrew
Date: 29 Oct 1996 15:02:29 GMT
Organization: TLJ Consulting
Lines: 33
Sender: [e-mail]
Message-ID: <5556a5$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: primus.paranoia.com
Summary: not necessary, often

In Article <[e-mail]>, through puissant locutio
n, [e-mail] soliloquized:
>Does anyone know where I can get schematics for VGA monitors? The company I
>consult for uses them on small boats and they get lots of pounding and
>vibration. I put 2 in the trash yesterday. I could repair them and give them
>away or save a few bucks. Also SMPS used in PC's (250 to 500 watts). Should b
e
>good for something in the shack! I have disposed of at least a dozen monitors
>in the past year. $250 $300 a pop adds up quick.

Greetings. Schematics aren't always necessary. Please check the
sci.electronics.repair FAQ at URL:

http://www.paranoia.com/~filipg/REPAIR/

especially the MONITOR:

http://www.paranoia.com/~filipg/HTML/REPAIR/F_mon_repair.html

and SMPS:

http://www.paranoia.com/~filipg/HTML/REPAIR/F_smps.html

Repair guides. They are also available via FTP and e-mail (from Sam).
Please see the sci.electronics.repair group for "FAQI" for more
information or just e-mail me and I'll send you the readme file.

http://www.paranoia.com/~filipg/HTML/REPAIR/F_ReadMe.html

Take care.
--
+-->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] Wed Oct 30 06:35:01 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!newsfeed.concentric.net!newshost.comco.com!frankensun.altair.com!newsserver.pixel.kodak.com!news.kodak.com!news.sprintlink.net!news-pen-16.sprintlink.net!cs.utexas.edu!howland.erols.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Anatoly P. Ganin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #459
Date: 26 Oct 96 15:08:33 GMT
Organization: Private
Lines: 1
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

jyfluf;yu


From [e-mail] Wed Oct 30 06:35:02 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.msfc.nasa.gov!centauri.hq.nasa.gov!newsfeed.gsfc.nasa.gov!Steven A
From: [e-mail] (Steven A. Bailey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with Intel 82510
Date: Mon, 21 Oct 96 14:46:32 GMT
Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
Lines: 28
Message-ID: <54g2e4$[e-mail]>
NNTP-Posting-Host: bailey.wff.nasa.gov
X-Newsreader: News Xpress 2.0 Beta #2

I am trying to initialize an 82510 in an embedded design and am having great
problems.  I am simply trying to put the 82510 in the 8250 compatability mode
and set the baud rate to 1200 baud.  I have read all the appropriate data
books and this seems like a simple proposition.  Sometimes the chip
initializes correctly and sometimes it does not.  Does anyone have any ideas?
Here is my 'C' code:

/*---------------------------------------------------------*/

GIRBANK = 0x00;     /* Switch to bank 0...8250 mode */
LCR     = 0x80;         /* Setup for baud selection */
BAL     = 0xa0;         /* Set 1200 baud...with 16 Mhz crystal */
BAH     = 0x01;
LCR     = 0x03;         /* 8 data bits, no parity */

while(1) {
                                /* Wait til TX buffer empty */
    while( ((value = LSR) & 0x40) == 0);

     TXD = 0x41;        /* Write the character 'A' to port */
}

/*-----------------------------------------------------------*/


Thanks,

Steve


From [e-mail] Wed Oct 30 06:35:02 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!lily.redrose.net!john
From: [e-mail] (James Pollock)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Importance of coax length on HF   A myth?
Date: 24 Oct 1996 09:17:30 GMT
Organization: Your Organization
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Hi.

   I have a friend who swears up and down that the length of the
coaxial cable to maintain resonance at a given frequency is important
for reducing the SWR.  He feels that it acts in a similar principal to
the fact that the elements of an antenna must be cut to the correct
length for the antenna to be resonant at a given frequency.

   It seems to me I have also read somewhere that this is a myth.  I
need the true scoop on this.  I'm preparing to put up a pretty good
antenna system on my roof (a homebrew 10 meter antenna cut to exactly
the middle of the band), and don't want to purchase an extra 6 ft of
Belden 9913 coax only to have it looped up and losing signal, when in
reality I could of used 20 feet instead of 26 feet of cable.

   Please carbon copy any responses to this post to [e-mail]
so I don't miss any good info.

                        Thanks

                            Jim



From [e-mail] Wed Oct 30 06:35:04 1996
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From: [e-mail] (Jim Potter)
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: Thu, 24 Oct 1996 16:21:37 GMT
Organization: The Santa Fe Institute
Lines: 44
Message-ID: <[e-mail]>
References: <54nc7a$[e-mail]>
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[e-mail] (James Pollock) wrote:

>Hi.
>
>   I have a friend who swears up and down that the length of the
>coaxial cable to maintain resonance at a given frequency is important
>for reducing the SWR.  He feels that it acts in a similar principal to
>the fact that the elements of an antenna must be cut to the correct
>length for the antenna to be resonant at a given frequency.
>
>   It seems to me I have also read somewhere that this is a myth.  I
>need the true scoop on this.  I'm preparing to put up a pretty good
>antenna system on my roof (a homebrew 10 meter antenna cut to exactly
>the middle of the band), and don't want to purchase an extra 6 ft of
>Belden 9913 coax only to have it looped up and losing signal, when in
>reality I could of used 20 feet instead of 26 feet of cable.
>
>   Please carbon copy any responses to this post to [e-mail]
>so I don't miss any good info.
>
>                       Thanks
>
>                            Jim
>
The length of coax doesn't change the VSWR, assuming it's all the same
impedance. However, the impedance at the transmitter output will be a
function of cable length if the VSWR is not 1:1.  Ultimately what
matters is not the VSWR, but the impedance match to the transmitter.
All that is required is a conjugate match so that the transmitter sees
a resistive load of the right resistance at the output device.

There is one way that the coax length affects VSWT. If the attenuation
is high the VSWR gets better with length. Someone once said a good low
power load for 144 MHz is 100 ft of RG-58. It doesn't matter too much
what's on the far end.

de K9GXC, 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] Wed Oct 30 06:35:05 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Importance of coax length on HF   A myth?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54nc7a$[e-mail]>
Date: Thu, 24 Oct 1996 14:07:27 GMT
Lines: 99
Xref: news1.epix.net rec.radio.amateur.antenna:30401 rec.radio.amateur.equipment:41155 rec.radio.amateur.homebrew:20449 rec.radio.amateur.misc:116949

In article <54nc7a$[e-mail]> [e-mail] (James Pollock) writ
es:
>   I have a friend who swears up and down that the length of the
>coaxial cable to maintain resonance at a given frequency is important
>for reducing the SWR.  He feels that it acts in a similar principal to
>the fact that the elements of an antenna must be cut to the correct
>length for the antenna to be resonant at a given frequency.
>
>   It seems to me I have also read somewhere that this is a myth.  I
>need the true scoop on this.  I'm preparing to put up a pretty good
>antenna system on my roof (a homebrew 10 meter antenna cut to exactly
>the middle of the band), and don't want to purchase an extra 6 ft of
>Belden 9913 coax only to have it looped up and losing signal, when in
>reality I could of used 20 feet instead of 26 feet of cable.

Ok, this can get complex because there are several interrelated
things happening here. Lets take them one at a time.

The only thing that determines SWR on a transmission line is
the ratio of the characteristic impedance of the line to the
impedance presented by *the load*. Nothing you can do at the
generator end can affect SWR, and changing the length of the
cable won't change SWR either (but see below).

However, changing the length of the line will change the impedance
presented to the generator. That's because a transmission line with
any SWR other than 1:1 acts as a transmission line transformer. By
changing the length of the line, you get an effect similar to, but
not quite the same as, changing the turns ratio of a transformer.
The SWR doesn't change, but the impedance presented to the generator
does. This can be useful, and is employed frequently for impedance
matching purposes. The most common such is the quarter wave matching
section.

In general, the impedance transformation will be complex, IE it will
be in the form of R+jX, where X can be capacitive or inductive depending
on cable length. The Smith Chart can be used to determine the transformation
effect by following the constant SWR circle around the chart for different
cable lengths (measured in wavelengths at the frequency of interest) and
reading out the R and X values. Note that the SWR is constant, but the
impedance presented to the generator changes with varying cable length.

Now something else can happen too, and this is where some of the
myths have arisen. If you feed a balanced antenna, such as a dipole,
with an unbalanced transmission line, such as coax, the *outside* of
the outer conductor of the transmission line can become part of one
arm of the dipole, and antenna currents can flow down the outside
of the transmission line.

Picture the dipole as a 1/4-wave section connected to the coax inner
and an L shaped element consisting of the other arm of the dipole and
the *outside* of the coax outer conductor. This can change the *load
impedance* presented to the transmission line because the antenna geometry
has been altered from a physically balanced dipole configuration, and
thus can change the SWR. Changing the coax length changes the effective
length of one leg of the dipole, and that changes the impedance presented
at the load end of the coax, and that changes SWR in the coax.

Coax transmission line currents flow on the outside of the inner
conductor and the inside of the outer conductor. This is because
of skin effect. The physics of coax forces the currents to be
equal in magnitude and opposite in direction. The opposite currents
cancel any radiation fields, and the coax doesn't radiate. But that
doesn't affect currents flowing on the outside of the outer conductor.
Those currents are independent of what's happening inside the coax.
Their radiation fields aren't canceled, and the coax becomes a radiating
part of the antenna.

Generally, it is undesirable to have antenna currents flowing on
the outside of the coax because it will alter the radiation pattern
of the antenna, alter its feedpoint impedance, and because it can
cause "hot shack" problems in some cases. The cure is to use a choke
balun at the antenna feedpoint to decouple the outside of the coax
from the antenna element to which the inside of the outer conductor
is connected.  (A choke balun can be simply a few turns of the coax
tightly coiled just before connection to the feedpoint. Or it can
consist of a number of ferrite beads slipped over the coax near
the feedpoint. Its purpose is to act as a high impedance to currents
trying to flow down the *outside* of the coax outer conductor.)

When you use such a balun, or if you are feeding an inherently
unbalanced antenna such as a groundplane mounted vertical, then
the coax doesn't become part of the antenna, so it can't change
the load impedance presented to the coax, and thus can't change
SWR. Any length coax can now be used without affecting SWR, or
antenna radiation pattern.

So you can see, there is some truth to the myth that coax length
can alter SWR, but it isn't quite the way many amateurs picture
it. The reason it can happen is because the coax has become an
unintended part of the antenna due to a failure to properly deal
with the unbalanced to balanced connection at the antenna feedpoint
with a balun.

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] Wed Oct 30 06:35:07 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.uoregon.edu!news.efn.org!usenet
From: [e-mail] (Dick Hughes)
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: Thu, 24 Oct 1996 19:30:42 GMT
Organization: Oregon Public Networking
Lines: 36
Message-ID: <[e-mail]>
References: <54nc7a$[e-mail]> <[e-mail]>
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On Thu, 24 Oct 1996 14:07:27 GMT, [e-mail] (Gary Coffman)
wrote:

>In article <54nc7a$[e-mail]> [e-mail] (James Pollock) wri
tes:
>>   I have a friend who swears up and down that the length of the
>>coaxial cable to maintain resonance at a given frequency is important
>>for reducing the SWR.  He feels that it acts in a similar principal to
>>the fact that the elements of an antenna must be cut to the correct
>>length for the antenna to be resonant at a given frequency.
>>
>>   It seems to me I have also read somewhere that this is a myth.  I
>>need the true scoop on this.  I'm preparing to put up a pretty good
>>antenna system on my roof (a homebrew 10 meter antenna cut to exactly
>>the middle of the band), and don't want to purchase an extra 6 ft of
>>Belden 9913 coax only to have it looped up and losing signal, when in
>>reality I could of used 20 feet instead of 26 feet of cable.
>
>Ok, this can get complex because there are several interrelated
>things happening here. Lets take them one at a time.
>
>The only thing that determines SWR on a transmission line is
>the ratio of the characteristic impedance of the line to the
>impedance presented by *the load*. Nothing you can do at the
>generator end can affect SWR, and changing the length of the
>cable won't change SWR either (but see below).

<huge snip>

>Gary

In general, the correct length of coax for an HF antenna is the
distance it takes to get from the transmitter to the antenna.  Don't
worry about length.

Dick Hughes - W6CCD



From [e-mail] Wed Oct 30 06:35:07 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!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!scnews.sc.intel.com!itnews.sc.intel.com!news
From: Cecil Moore <[e-mail]>
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: Fri, 25 Oct 1996 10:30:18 -0700
Organization: Intel Corporation
Lines: 6
Message-ID: <[e-mail]>
References: <54nc7a$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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Steve Bramham wrote:
> I know what works and it works in 99% of the cases involved.....

Hey Steve, be fair - tell us about that other 1%.

73, Cecil, W6RCA, OOTC  (not speaking for my employer)


From [e-mail] Wed Oct 30 06:35:09 1996
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From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,
Subject: Re: Importance of coax length on HF   A myth?
Date: Fri, 25 Oct 1996 11:34:01 -0600
Organization: Los Alamos National Laboratory
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James Pollock wrote:
<snippety>
>    It seems to me I have also read somewhere that this is a myth.  I
> need the true scoop on this.  I'm preparing to put up a pretty good
> antenna system on my roof (a homebrew 10 meter antenna cut to exactly
> the middle of the band), and don't want to purchase an extra 6 ft of
> Belden 9913 coax only to have it looped up and losing signal, when in
> reality I could of used 20 feet instead of 26 feet of cable.
> <again snippety>

Jim, in addition to the responses you've already received I want to add
the certainty that even with RG-58 the "26 feet of cable" would result
in essentially NO extra noticeable loss than "20 feet of cable".  And
with Belden 9913 the additional loss would be even more miniscule.
According to my charts, the losses of these cables are: (per 100 feet @
30 MHZ)
RG-58            2.5 dB
Belden 9913      0.75 dB (!)
RG-8             1.0 dB

So, even if you were using the dreaded RG58 the loss would be less than
a fraction of a dB for the additional 6 feet or so of coax.  Even with a
high SWR (where the reflections cause more than one trip "up and down
the coax" and thus increase the effective loss) 26 feet is not a big
deal at all.  3 dB is generally regarded as a barely discernable
difference on the receiving end without accurate test equipment to
"help" notice the difference.
As your previous respondees have noted, if the SWR is high you CAN
"fool" the transmitter into "seeing" a lower SWR by messing with coax
length but far more will be gained by trying to lower the SWR up at the
antenna FEEDPOINT which will not only make your transmitter happier but
increase apparent antenna effectiveness too, both transmit and receive.
"SWR" is SO overhyped as important anyway.  I fondly recall in the '70's
working all kinds of DX on 10 meters with a homebrew 2 (TWO!) meter J
pole since I was a poor college student and didn't have the nerve to
sneak HF wires onto the roof of my college housing.....
I suppose it worked so well because I didn't own an SWR meter, just
heard the band was open and tried the J pole since that was all I had on
the roof and had a blast with it, who knows what the SWR was, but I'd
have had to QRT had I had a meter to scare myself with.....
--
|-------------------------------------------------------|
|Jim Devenport WB5AOX                                   |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|http://nis-www.lanl.gov/~jdport/                       |
|-------------------------------------------------------|


From [e-mail] Wed Oct 30 06:35:10 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: [e-mail] (Jim Potter)
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: Fri, 25 Oct 1996 01:41:26 GMT
Organization: The Santa Fe Institute
Lines: 25
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References: <54nc7a$[e-mail]> <[e-mail]>
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[e-mail] (Gary Coffman) wrote:

>So you can see, there is some truth to the myth that coax length
>can alter SWR, but it isn't quite the way many amateurs picture
>it. The reason it can happen is because the coax has become an
>unintended part of the antenna due to a failure to properly deal
>with the unbalanced to balanced connection at the antenna feedpoint
>with a balun.
>
>Gary


Good point, Gary. I hadn't thought of that, but it makes a lot of
sense. Most of the systems I deal with have a resonant cavity load fed
with rigid coax where there is no chance of any rf currents on the
outside. (A good thing too, at 250 kW peak and 425 MHz.)

de K9GXC, 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] Wed Oct 30 06:35:12 1996
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From: Maude Schyffert <[e-mail]>
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: Fri, 25 Oct 1996 09:12:54 -0700
Organization: -
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> In general, the correct length of coax for an HF antenna is the
> distance it takes to get from the transmitter to the antenna.  Don't
> worry about length.
>
> Dick Hughes - W6CCD

That is a damn good answer and works in 99.99%, the rest is fiction.

42 years of hamming SM0BKZ


From [e-mail] Wed Oct 30 06:35:13 1996
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From: [e-mail]
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: 25 Oct 1996 22:55:59 GMT
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In <[e-mail]>, [e-mail] (Jim Potter) writes:
>[e-mail] (James Pollock) wrote:
>
>>Hi.
>>
>>   I have a friend who swears up and down that the length of the
>>coaxial cable to maintain resonance at a given frequency is important
>>for reducing the SWR.  He feels that it acts in a similar principal to
>>the fact that the elements of an antenna must be cut to the correct
>>length for the antenna to be resonant at a given frequency.
>>
>>   It seems to me I have also read somewhere that this is a myth.  I
>>need the true scoop on this.  I'm preparing to put up a pretty good
>>antenna system on my roof (a homebrew 10 meter antenna cut to exactly
>>the middle of the band), and don't want to purchase an extra 6 ft of
>>Belden 9913 coax only to have it looped up and losing signal, when in
>>reality I could of used 20 feet instead of 26 feet of cable.
>>
>>   Please carbon copy any responses to this post to [e-mail]
>>so I don't miss any good info.
>>
>>                      Thanks
>>
>>                            Jim
>>
>The length of coax doesn't change the VSWR, assuming it's all the same
>impedance. However, the impedance at the transmitter output will be a
>function of cable length if the VSWR is not 1:1.  Ultimately what
>matters is not the VSWR, but the impedance match to the transmitter.
>All that is required is a conjugate match so that the transmitter sees
>a resistive load of the right resistance at the output device.
>
>There is one way that the coax length affects VSWT. If the attenuation
>is high the VSWR gets better with length. Someone once said a good low
>power load for 144 MHz is 100 ft of RG-58. It doesn't matter too much
>what's on the far end.
>
>de K9GXC, 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
>


 Well,
 Let's if I can do this reply. Yes, It's a myth! The only thing that's changin
g is the
 APPARENT XL-XC that the METER is seeing. We all know that the Electrical
 wavelength recurrs at a different distance than the phusical wavelength. The
old
 velocity factor trick affects that (cheaper coax = lower VF). So, the loss is

 cumulative to the length, the SWR associated with the coax = myth.

 If you want to play with the numbers of length, coax type, swr, ant gain, and
 effective power. Download TEEREV.ZIP from the ARRL BBS, or it's on the latest
 level of the QRZ CD-ROM.

                                                          Jim WD9AHF

 P.S. I agree with the guy who said the correct length is what reaches! Just m
ake
 sure that you look at what it costs. I wrote that TEEREV program to see what
 the tradeoff was between good coax vs an amplifier. You will be surprised at
 what the cost of 'cheap' coax is.



From [e-mail] Wed Oct 30 06:35:14 1996
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From: Cecil Moore <[e-mail]>
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: Fri, 25 Oct 1996 17:07:04 -0700
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Joel Gamble wrote:
>    The ONLY time coax length makes a difference is when it is radiating
> rf,thus it becomes an active part of the antenna,instead of the passive
> conduit it is designed to be.

Hi Joel, got to nitpick a tad.

1. 100ft of RG-58 on 440MHz with an SWR of 1:1 and *no feedline radiation*
does make a difference.

2. 100ft of RG-58 on 28MHz with an SWR of 20:1 and *no feedline radiation*
does make a difference.

73, Cecil, W6RCA, OOTC  (not speaking for my employer)


From [e-mail] Wed Oct 30 06:35:15 1996
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From: [e-mail] (Richard Hosking)
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: Fri, 25 Oct 1996 22:58:59 GMT
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[e-mail] (James Pollock) wrote:

>Hi.

>   I have a friend who swears up and down that the length of the
>coaxial cable to maintain resonance at a given frequency is important
>for reducing the SWR.  He feels that it acts in a similar principal to
>the fact that the elements of an antenna must be cut to the correct
>length for the antenna to be resonant at a given frequency.

>   It seems to me I have also read somewhere that this is a myth.  I
>need the true scoop on this.  I'm preparing to put up a pretty good
>antenna system on my roof (a homebrew 10 meter antenna cut to exactly
>the middle of the band), and don't want to purchase an extra 6 ft of
>Belden 9913 coax only to have it looped up and losing signal, when in
>reality I could of used 20 feet instead of 26 feet of cable.

Jim
If the coax is matched (ie the load presents a resistive, 50 Ohm
impedance) then the length of the coax is unimportant, except that it
has loss depending on how good it is and the operating frequency. If
the load is not matched properly then there will be different
impedances at different  points aliong the coax and you will get a
different SWR with a 50 ohm source, depending on where you feed the
coax. So your friend is correct if the load is not m,atched
accurately.

Richard Hosking

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



From [e-mail] Wed Oct 30 06:35:16 1996
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From: [e-mail] (Jim Potter)
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, 26 Oct 1996 03:48:21 GMT
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[e-mail] (Roy Lewallen) wrote:


>There's one more way that cable length can affect VSWR. If common-mode
>current is present (that is, current is flowing on the outside of coax, or
>the currents in twinlead aren't equal and opposite), the feedline becomes
>part of the antenna. In that situation, changing the length of the feedline
>changes the antenna itself, which will affect VSWR.
>
>VSWR can seem to change with cable length if the characteristic impedance
>of the VSWR meter isn't the same as that of the cable. I've measured RG-58
>at over 60 ohms Z0, and a couple of cheap SWR meters I've looked at were
>off also, so I imagine this is a fairly common occurrence. In this case,
>the SWR doesn't really change with feedline length, but the SWR meter says
>it does.
>
>Roy Lewallen, W7EL

I agree with your comment on common mode currents. Also, with your
comment about the directional coupler. What it really amounts to is
that if the coupler has poor directivity (equivalent to not being
balanced for the impedance of the cable being used), some of the
forward wave is coupled into the reflected port. The resultant
apparent reflected signal depends on the relative phases of the
forward and reflected power and thus on the position of the coupler in
the standing wave. This phenomenon can also make the VSWR look better
than it really is if the two waves tend to cancel.

This discussion is a good example of the Internet at work. It's nice
to see that the ham radio newsgroup generally seems to be populated by
considerate people and not the nutcakes that wase bandwidth on a
couple of other newsgroups I follow.

73 de K9GXC, 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] Wed Oct 30 06:35:17 1996
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From: [e-mail] (Tom Sefranek)
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, 26 Oct 1996 15:34:46 GMT
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Cecil Moore <[e-mail]> wrote:

>Joel Gamble wrote:
>>    The ONLY time coax length makes a difference is when it is radiating
>> rf,thus it becomes an active part of the antenna,instead of the passive
>> conduit it is designed to be.

>Hi Joel, got to nitpick a tad.

>1. 100ft of RG-58 on 440MHz with an SWR of 1:1 and *no feedline radiation*
>does make a difference.

Your right, I'd much rather have 75 ohm 1" hardline WITH VSWR than 50
ohm RG-58 at 450 Mhz.

>2. 100ft of RG-58 on 28MHz with an SWR of 20:1 and *no feedline radiation*
>does make a difference.

Again I'd rather have 75 ohm cable TV hardline .5" than RG-58.
Cecil is right, the general rule is get what you can for the lowest
loss.  Hgh VSWR adds a LOT of loss to an already losssy cable.

>73, Cecil, W6RCA, OOTC  (not speaking for my employer)

Tom
WA1RHP
Net Elmer
I am my own employer!




From [e-mail] Wed Oct 30 06:35:18 1996
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From: [e-mail] (Gary Coffman)
Subject: Re: Importance of coax length on HF   A myth?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54nc7a$[e-mail]> <54rg26$[e-mail]>
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In article <54rg26$[e-mail]> [e-mail] writes:
>Jim
>If the coax is matched (ie the load presents a resistive, 50 Ohm
>impedance) then the length of the coax is unimportant, except that it
>has loss depending on how good it is and the operating frequency. If
>the load is not matched properly then there will be different
>impedances at different  points aliong the coax and you will get a
>different SWR with a 50 ohm source, depending on where you feed the
>coax. So your friend is correct if the load is not m,atched
>accurately.

No, the SWR is constant, and is a function of the mismatch at the
load end only. That constant SWR is what causes the presented
impedance variation along the line (due to transmission line
transformer action). If you insert the SWR meter anywhere along
the line, it will read the same SWR (discounting line loss). A
SWR meter reads SWR, not impedance.

Internally, a SWR meter is a 50 ohm line section, so it merely
acts as a short extension to the cable being measured. (If you
try to measure 75 ohm line with a 50 ohm SWR meter, however,
you'll be in for some surprises.)

Conversely, if you have an operating impedance bridge, you can
measure the impedance at any point along the line, and given
that, the cable length from the load to that point, and a Smith
Chart, you can determine the SWR on the line (discounting line
loss).

Now if the line has loss, and all real lines do, then you have
to add a fourth variable, and the system becomes more complex.
Instead of a constant SWR circle on the Smith Chart, now you have
to follow a SWR spiral which approaches 1:1 as cable length tends
toward infinity. The approach is asymptotic, and if cable loss is
high, will quickly approach 1:1, but never quite reaches 1:1. If
loss is low, the approach will be very gradual, and for moderate
line lengths can be assumed to be a constant SWR circle.

(Incidently, this is a convienent way to measure line loss,
just place a short or open at the load end of the cable and
read the SWR at the source end, the closer to 1:1 it is, the
higher the cable loss. There's a formula in the Handbook which
will give you the exact loss in db for a given SWR and line
length.)

For moderate lengths of good cable at HF (good cable, not RG-58),
cable loss can be discounted and the SWR circle can be assumed
nearly constant. At VHF+ however, even with good cables loss may
become significant when the length exceeds several wavelengths
and must be considered when analyzing line behavior.

This means that a low SWR is not necessarily a good thing. It
can indicate a lossy system rather than indicating a good match.
One way to differentiate is to look at the SWR curve over a band
of frequencies. If it is broad and flat, the cable is probably
lossy (or you have a dummy load for a termination). Real antennas
are typically only close to design impedance over a narrow frequency
range (typically less than 5% around the design frequency), so the
SWR curve should quickly rise as it moves away from the center
frequency of that range. Anyone who says he has a broad flat SWR
is probably really telling you he has a pretty good dummy load
for an antenna system.

(Note there are exceptions, antennas such as discones and log
periodics present a near constant impedance over a large frequency
excursion. But in general a low antenna system Q is indicative of
low efficiency and high loss, IE the behavior of a dummy load.)

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] Wed Oct 30 06:35:19 1996
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From: Merv Stump <[e-mail]@postoffice.worldnet.att.net>
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: 26 Oct 1996 22:42:30 GMT
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ARRL currently has a program under development which analyzes transmission
line.  I'm fortunate to have been asked to play with an early copy.
Running some quick examples shows the following:

At 28 MHz an antenna with a purely resistive load of 50 ohms fed with 100
feet of RG213 has a loss of 1.181 dB.  There is no additional loss due to
SWR.

The same antenna fed with 100 feed of 1/2 inch 75 ohm hard line has a loss
of .420 dB due to the cable and an additional .032 dB due to the SWR for a
total loss of .452 dB.

An antenna with a purely resistive load of 500 ohms (10/1 SWR) fed with
RG213 has a loss of 1.181 due to the cable and an additional 2.702 dB due
to the SWR for a total loss of 3.883 dB.

The same antenna fed with 1/2 inch  75 ohm hard line has a loss of .420 DB
due to the cable and an additional .032 dB due to SWR for a total loss of
452 dB.

Incidentally, I chose purely resistive loads just to simplify things.  The
program works with complex loads as well.  If anyone would like a specific
calculation you can eMail me.  All that is needed is the type cable, the
length of the cable, the frequency and the load, (resistive and
inductive).

Regards, Merv



From [e-mail] Wed Oct 30 06:35:21 1996
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From: altavoz <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,
Subject: Re: Importance of coax length on HF   A myth?
Date: Sat, 26 Oct 1996 21:02:32 -0700
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Jim Devenport wrote:
>
> James Pollock wrote:
> <snippety>
> >    It seems to me I have also read somewhere that this is a myth.  I
> > need the true scoop on this.  I'm preparing to put up a pretty good
> > antenna system on my roof (a homebrew 10 meter antenna cut to exactly
> > the middle of the band), and don't want to purchase an extra 6 ft of
> > Belden 9913 coax only to have it looped up and losing signal, when in
> > reality I could of used 20 feet instead of 26 feet of cable.
> > <again snippety>
>
> Jim, in addition to the responses you've already received I want to add
> the certainty that even with RG-58 the "26 feet of cable" would result
> in essentially NO extra noticeable loss than "20 feet of cable".  And
> with Belden 9913 the additional loss would be even more miniscule.
> According to my charts, the losses of these cables are: (per 100 feet @
> 30 MHZ)
> RG-58            2.5 dB
> Belden 9913      0.75 dB (!)
> RG-8             1.0 dB
>
> So, even if you were using the dreaded RG58 the loss would be less than
> a fraction of a dB for the additional 6 feet or so of coax.  Even with a
> high SWR (where the reflections cause more than one trip "up and down
> the coax" and thus increase the effective loss) 26 feet is not a big
> deal at all.  3 dB is generally regarded as a barely discernable
> difference on the receiving end without accurate test equipment to
> "help" notice the difference.
> As your previous respondees have noted, if the SWR is high you CAN
> "fool" the transmitter into "seeing" a lower SWR by messing with coax
> length

altavoz: No, you cant fool the transmitter, the SWR will not change
on changing coax length.


but far more will be gained by trying to lower the SWR up at the
> antenna FEEDPOINT which will not only make your transmitter happier but
> increase apparent antenna effectiveness too, both transmit and receive.
> "SWR" is SO overhyped as important anyway.  I fondly recall in the '70's
> working all kinds of DX on 10 meters with a homebrew 2 (TWO!) meter J
> pole since I was a poor college student and didn't have the nerve to
> sneak HF wires onto the roof of my college housing.....
> I suppose it worked so well because I didn't own an SWR meter, just
> heard the band was open and tried the J pole since that was all I had on
> the roof and had a blast with it, who knows what the SWR was, but I'd
> have had to QRT had I had a meter to scare myself with.....Jim Devenport WB5
AOX


From [e-mail] Wed Oct 30 06:35:22 1996
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From: altavoz <[e-mail]>
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, 26 Oct 1996 20:24:58 -0700
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James Pollock wrote:
>
> Hi.
>
>    I have a friend who swears up and down that the length of the
> coaxial cable to maintain resonance at a given frequency is important
> for reducing the SWR.  He feels that it acts in a similar principal to
> the fact that the elements of an antenna must be cut to the correct
> length for the antenna to be resonant at a given frequency.
>
>    It seems to me I have also read somewhere that this is a myth.  I
> need the true scoop on this.  I'm preparing to put up a pretty good
> antenna system on my roof (a homebrew 10 meter antenna cut to exactly
> the middle of the band), and don't want to purchase an extra 6 ft of
> Belden 9913 coax only to have it looped up and losing signal, when in
> reality I could of used 20 feet instead of 26 feet of cable.    Jim

altavoz: 9913 !!! on 30 MHZ  NOT !! RG8FOAM
You'll see a .7 db/100'  to .9db/100' increase in attenuation
going to RG8foam . WOW , BIG LOSS ( NOT)
  Stick to radiation pattern adjustments , not splitting hairs
over coax.
  Read "amatuer radio vert' antenna handbook" By CAPT Paul H.Lee
deceased (N6PL) . Its the greatest.




______End of text  from altavoz___________


From [e-mail] Wed Oct 30 06:35:24 1996
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From: altavoz <[e-mail]>
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, 26 Oct 1996 20:47:30 -0700
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Dave Hockaday wrote:
>
> James Pollock wrote:
> >    I have a friend who swears up and down that the length of the
> > coaxial cable to maintain resonance at a given frequency is important
> > for reducing the SWR.  He feels that it acts in a similar principal to
> > the fact that the elements of an antenna must be cut to the correct
> > length for the antenna to be resonant at a given frequency.
>
> Hi Jim. This is true if the feedline impedance is different than that of
> the antenna/transmitter. If you use 50 ohm feedline with a 50 ohm
> antenna/transmitter, any length is acceptable. If you substituted say, 75
> ohm feedline, you would need to cut the feedline in 1/2 wl multiples (the
> impedance is repeated every 1/2 wl).
>
> Dave Hockaday WB4IUY

altavoz: You dont need to cut in 1/2 wave multiples
since it wont change the SWR except thru a very small
increase due to decreasing attenuation over length.
H.F. has very low attenuation on RG8


From [e-mail] Wed Oct 30 06:35:25 1996
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From: [e-mail]
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: 27 Oct 1996 04:01:20 GMT
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In <[e-mail]>, Cecil Moore <[e-mail].c
om> writes:
>Joel Gamble wrote:
>>    The ONLY time coax length makes a difference is when it is radiating
>> rf,thus it becomes an active part of the antenna,instead of the passive
>> conduit it is designed to be.
>
>Hi Joel, got to nitpick a tad.
>
>1. 100ft of RG-58 on 440MHz with an SWR of 1:1 and *no feedline radiation*
>does make a difference.
>
>2. 100ft of RG-58 on 28MHz with an SWR of 20:1 and *no feedline radiation*
>does make a difference.
>
>73, Cecil, W6RCA, OOTC  (not speaking for my employer)

 Cecil,

  Have they just recently started calling 440 Mhz HF?  :-)))  <- beard

                                                         Jim WD9AHF


From [e-mail] Wed Oct 30 06:35:26 1996
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From: altavoz <[e-mail]>
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, 26 Oct 1996 21:13:23 -0700
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> It's possible to use a cable with an impedance not
> equal to the characteristic impedance of your
> antenna and rig. For example, a half wave length
> of 75 ohm cable will work between a 50 ohm antenna
> and a 50 ohm transmitter.  You can also use 75 ohm
> cable to match a 100 ohm antenna to a 50 ohm rig
> by cutting it to the right length.  Unfortunately,
> these tricks generally only work at one frequency.
>
> In this case, the length of the cable is critical
> to a given frequency.
>
> Steve KT4FY

altavoz: No, a 50 ohm ant' feeding a 75ohm coax will
cause a SWR into coax and towards the radio and an exact
length of coax will not reduce the SWR except as
attenuation factor over that length.


______End of text  from altavoz___________


From [e-mail] Wed Oct 30 06:35:27 1996
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From: Merv Stump <[e-mail]@postoffice.worldnet.att.net>
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: 27 Oct 1996 10:28:11 GMT
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Merv Stump <[e-mail]@postoffice.worldnet.att.net> wrote:
>ARRL currently has a program under development which analyzes transmission
>line.  I'm fortunate to have been asked to play with an early copy.
>Running some quick examples shows the following:
>
>At 28 MHz an antenna with a purely resistive load of 50 ohms fed with 100
>feet of RG213 has a loss of 1.181 dB.  There is no additional loss due to
>SWR.
>
>The same antenna fed with 100 feed of 1/2 inch 75 ohm hard line has a loss
>of .420 dB due to the cable and an additional .032 dB due to the SWR for a
>total loss of .452 dB.
>
>An antenna with a purely resistive load of 500 ohms (10/1 SWR) fed with
>RG213 has a loss of 1.181 due to the cable and an additional 2.702 dB due
>to the SWR for a total loss of 3.883 dB.
>
>The same antenna fed with 1/2 inch  75 ohm hard line has a loss of .420 DB
>due to the cable and an additional .032 dB due to SWR for a total loss of
>452 dB.
>
>Incidentally, I chose purely resistive loads just to simplify things.  The
>program works with complex loads as well.  If anyone would like a specific
>calculation you can eMail me.  All that is needed is the type cable, the
>length of the cable, the frequency and the load, (resistive and
>inductive).
>
>Regards, Merv
>
I've had a couple of requests for examples directly addressing the length
of coax question:

At 28 MHz an antenna with an impedance of 70R +4J fed with 11.597 feet of
RG213(1/2 wave length at 28 MHz) has an impedance at the input of 69.28R
+3.76J.  Virtually identical to the load, but even a halfwave of cable
does have some transforming characteristics due to it's loses.  TLA
computes the SWR at load as 1.41/1 and at the input as 1.40/1.

The same antenna fed with 5.798 feet of RG213 (1/4 wave length at 28MHz)
has an impedance at the load of 35.77R -2.35J.  An obvious transformation
of the impedance, however, the SWR is still 1.41/1.

If you feed the antenna with 1/2 wave of PERFECT COAX,(NO LOSSES) TLA
computes the impedance at input as 70.02R + 3.79J (The difference between
this and 70R and 4J can be attributed to rounding.)

Regards, Merv



From [e-mail] Wed Oct 30 06:35:29 1996
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From: altavoz <[e-mail]>
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: Sun, 27 Oct 1996 14:31:17 -0800
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Cecil Moore wrote:
>
> Joel Gamble wrote:
> >    The ONLY time coax length makes a difference is when it is radiating
> > rf,thus it becomes an active part of the antenna,instead of the passive
> > conduit it is designed to be.
>
> Hi Joel, got to nitpick a tad.
>
> 1. 100ft of RG-58 on 440MHz with an SWR of 1:1 and *no feedline radiation*
> does make a difference.

altavoz: I get 271 "1/4 wavelengths" and that makes it an ODD multiple
of 1/4w and therefore it will radiate cause the open end of the coax
will see a short on the outside end of the coax at the radio end.
.66 VF RG58 , assuming a high SWR at load and 1:1 at radio.

> 2. 100ft of RG-58 on 28MHz with an SWR of 20:1 and *no feedline radiation*
> does make a difference.

altavoz: The diff we're talking of is trimming the line and in your
case trimming the line will increase the RF ( feedline radiation)
on the outside of the coax By pulling down the Z seen on the outside
by the antenna . Trimming 1/4w will peak the FEEDLINE RADIATION.



> 73, Cecil, W6RCA, OOTC  (not speaking for my employer)

--

______End of text  from altavoz___________


From [e-mail] Wed Oct 30 06:35:30 1996
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From: Cecil Moore <[e-mail]>
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: Mon, 28 Oct 1996 08:26:52 -0800
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altavoz wrote:
> ... therefore it will radiate cause the open end of the coax
> will see a short on the outside end of the coax at the radio end.
> ...Trimming 1/4w will peak the FEEDLINE RADIATION.

How is the RF current going to get past the choke?

73, Cecil, W6RCA, OOTC  (not speaking for my employer)


From [e-mail] Wed Oct 30 06:35:31 1996
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From: altavoz <[e-mail]>
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: Mon, 28 Oct 1996 10:08:55 -0800
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Cecil Moore wrote:
>
> altavoz wrote:
> > ... therefore it will radiate cause the open end of the coax
> > will see a short on the outside end of the coax at the radio end.
> > ...Trimming 1/4w will peak the FEEDLINE RADIATION.
>
> How is the RF current going to get past the choke?
>
> 73, Cecil, W6RCA, OOTC  (not speaking for my employer)


altavoz: You're assuming a choke . The thread makes more sense
if you dont assume a choke ( i went all the way back to JOEL
GAMBLEs post)


I think he's saying a 440 signal into RG58 is a 1:1 NO MATTER
WHAT cause it's 100 feet long and that means it could be an
open circuit . I think he tried to get one past us by making
us assume that there was a termination .
  Anyway the way to kill it is BALUN,steel wool, ferrite,
cut coax to a particular length ( narrow BW), or offset feed
the antenna ( bal ant has an unbal' point where you can hook
coax, and pattern does not suffer ).
  What i find amasing is so many novices worry about the
match , but not the radiation pattern . You can match
anything, even a 1/2w by stretching it a little to bring
down the R and that 2nd lobe is too small to hurt .
  Radiation pattern on a J pole is bad but has a nice
stub to match it....so build a 5/8w using that stub to match
it. Problem is the standard way ( "L" )is just as simple.
  Thanks for correcting my sloppy thinking, 73's




______End of text  from altavoz___________


From [e-mail] Wed Oct 30 06:35:32 1996
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From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,
Subject: Re: Importance of coax length on HF   A myth?
Date: Mon, 28 Oct 1996 10:05:18 -0800
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altavoz wrote:
> No, you can't fool the transmitter...

and later altavoz wrote:

> The 1/4w 70 ohm coax converts the 100 (ohm) antenna to
> 50 ohms to please the radio.

So Altavoz, please tell us the difference between "fooling
the transmitter" and "pleasing the radio"?

73, Cecil, W6RCA, OOTC  (not speaking for my employer)


From [e-mail] Wed Oct 30 06:35:33 1996
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From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,
Subject: Re: Importance of coax length on HF   A myth?
Date: Mon, 28 Oct 1996 10:17:40 -0800
Organization: Intel Corporation
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Cecil Moore wrote:
> So Altavoz, please tell us the difference between "fooling
> the transmitter" and "pleasing the radio"?

My apologies, I posted this before I received the following:

>altavoz: My mistake . YOU ARE RIGHT .  The Z from a 50 ohm
>load will go up as you move towards the transmiter on coax
>thats higher than 50ohm and will go lower on coax thats less
>then 50ohms.

Please ignore the previous posting. I'll be glad when netnews
is real-time.

73, Cecil, W6RCA, OOTC  (not speaking for my employer)


From [e-mail] Wed Oct 30 06:35:34 1996
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From: Dave Hand <[e-mail]>
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: Mon, 28 Oct 1996 16:35:46 -0500
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altavoz wrote:
>
> > It's possible to use a cable with an impedance not
> > equal to the characteristic impedance of your
> > antenna and rig. For example, a half wave length
> > of 75 ohm cable will work between a 50 ohm antenna
> > and a 50 ohm transmitter.  You can also use 75 ohm
> > cable to match a 100 ohm antenna to a 50 ohm rig
> > by cutting it to the right length.  Unfortunately,
> > these tricks generally only work at one frequency.
> >
> > In this case, the length of the cable is critical
> > to a given frequency.
> >
> > Steve KT4FY
>
> altavoz: No, a 50 ohm ant' feeding a 75ohm coax will
> cause a SWR into coax and towards the radio and an exact
> length of coax will not reduce the SWR except as
> attenuation factor over that length.
>
>
> ______End of text  from altavoz___________

Wrong O buddy boy.

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!

Dave Hand WB4HYP


From [e-mail] Wed Oct 30 06:35:36 1996
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From: [e-mail] (Gary Coffman)
Subject: Re: Importance of coax length on HF   A myth?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
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In article <[e-mail]> altavoz <[e-mail]>
 writes:
>> It's possible to use a cable with an impedance not
>> equal to the characteristic impedance of your
>> antenna and rig. For example, a half wave length
>> of 75 ohm cable will work between a 50 ohm antenna
>> and a 50 ohm transmitter.  You can also use 75 ohm
>> cable to match a 100 ohm antenna to a 50 ohm rig
>> by cutting it to the right length.  Unfortunately,
>> these tricks generally only work at one frequency.
>>
>> In this case, the length of the cable is critical
>> to a given frequency.
>>
>> Steve KT4FY
>
>altavoz: No, a 50 ohm ant' feeding a 75ohm coax will
>cause a SWR into coax and towards the radio and an exact
>length of coax will not reduce the SWR except as
>attenuation factor over that length.

You two are talking about different things. Sure, the SWR on
the cable will not be unity, but if you cut the cable to an
electrical halfwave (or multiple), you *don't care* because
the impedance seen by the source is a repetition of the
impedance presented by the load. The source doesn't care
about SWR on the cable, it only cares that it sees the
correct impedance presented to it.

In the case of a 100 ohm load and a 50 ohm source, an electrical
1/4-wave of 75 ohm cable will transform the load impedance to
50 ohms at the source end of the cable. The source will be happy,
the load will be happy, and we'll be real happy there is SWR on
the cable, because it is this SWR which makes the transformation
happen. A "high" SWR isn't always bad, in fact it can be downright
useful at times.

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] Wed Oct 30 06:35:37 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!hammer.uoregon.edu!csulb.edu!info.ucla.edu!psgrain!news.rain.net!hevanet.com!usenet
From: "miker in Tigard, OR." <[e-mail]>
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: Wed, 30 Oct 1996 01:56:16 -0800
Organization: Hevanet Communications
Lines: 54
Message-ID: <[e-mail]>
References: <54nc7a$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ke-ppp04.hevanet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win95; I)
Xref: news1.epix.net rec.radio.amateur.antenna:30728 rec.radio.amateur.equipment:41410 rec.radio.amateur.homebrew:20595 rec.radio.amateur.misc:117204

Dick Hughes wrote:
>
> On Thu, 24 Oct 1996 14:07:27 GMT, [e-mail] (Gary Coffman)
> wrote:
>
> >In article <54nc7a$[e-mail]> [e-mail] (James Pollock) w
rites:
> >>   I have a friend who swears up and down that the length of the
> >>coaxial cable to maintain resonance at a given frequency is important
> >>for reducing the SWR.  He feels that it acts in a similar principal to
> >>the fact that the elements of an antenna must be cut to the correct
> >>length for the antenna to be resonant at a given frequency.
> >>
> >>   It seems to me I have also read somewhere that this is a myth.  I
> >>need the true scoop on this.  I'm preparing to put up a pretty good
> >>antenna system on my roof (a homebrew 10 meter antenna cut to exactly
> >>the middle of the band), and don't want to purchase an extra 6 ft of
> >>Belden 9913 coax only to have it looped up and losing signal, when in
> >>reality I could of used 20 feet instead of 26 feet of cable.
> >
> >Ok, this can get complex because there are several interrelated
> >things happening here. Lets take them one at a time.
> >
> >The only thing that determines SWR on a transmission line is
> >the ratio of the characteristic impedance of the line to the
> >impedance presented by *the load*. Nothing you can do at the
> >generator end can affect SWR, and changing the length of the
> >cable won't change SWR either (but see below).
>
> <huge snip>
>
> >Gary
>
> In general, the correct length of coax for an HF antenna is the
> distance it takes to get from the transmitter to the antenna.  Don't
> worry about length.
>
> Dick Hughes - W6CCD


There's an important issue that has not been mentioned.
If your SWR is 1:1, coax length is unimportant.
If it's not, then the impedance looking into the coax is a function
of the length.  Draw a (constant SWR) circle on a Smith Chart.  As you
change length,
you move around that circle.  As long as your transmiter can match
any impedance on the circle, you're OK.  With a high SWR or with a
modern no-tune rig, you might find that the rig behaves significantly
differently depending on the coax length.  SWR doesn't change, but
the matching network required to drive the coax sure does.

Having said that, I suggest you put your effort into making the antenna
1:1 rather than messing with the coax length.

miker


From [e-mail] Wed Oct 30 06:35:40 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!news
From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is building equipment a lost art?
Date: 21 Oct 1996 13:13:17 GMT
Organization: Netcom
Lines: 50
Message-ID: <54fstd$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pax-ca25-23.ix.netcom.com
X-NETCOM-Date: Mon Oct 21  6:13:17 AM PDT 1996

In <[e-mail]> [e-mail] (Gary
Coffman) writes:
>
>In article <[e-mail]> Michael Toner <[e-mail]>
writes:
>>
>>Another way to remove a SMD from a PCB is to use a hot air gun.
>>You need enough heat to melt the solder, but it is quicker
>>and does less damage than cutting the leads with a knife.
>>On the down-side, it tends to de-solder adjacent components...
>
>See another of my posts about electric hot air guns. Hot oxygen is
>corrosive, a torch is better because the air stream is mostly inert
>combustion products. As to de-soldering surrounding components,
>use of a hot air shroud on the hot air source, and use of modeling
>clay to form protective heat dams, can deal with that.

    Some years ago I often visited a manufacturing subcontractor in the
Southeast who used hot air for re-attaching SMD rework.  These looked
like big soldering pencils sans tip, and attached to both the AC line
and the compressed-air lines that ran throughout the facility.  They
didn't seem to have a problem with their joints, so I don't think I'd
worry too much about hot-air induced corrosion problems.  Take a stroll
through an electronics tool catalog (Techni-Tool, for example) and
you'll see any number of hot-air SMD soldering tools.

    If I were to use hot-air rather than an iron, I'd buy one
specifically made for SMD work.  With them you can control the heat,
and they come with different size directors (deflectors?).  I don't
know how well a standard hot-air gun would work, but you can't control
their heat and they're big and unwieldly.  Gary's idea of the Weller
propane device is a good one, too.

    Then again, Friday I visited our manufacturing subcontractor (local
here in the Silicon Valley), and they used Metcal stations throughout
(this is a fancy soldering iron).  At home I use my Weller iron (I'd
rather have a Metcal - I'm keeping my eyes open at the swapmeets!).

    In other words, use whatever works best for you.  If you use an
iron, there are three things that you'll need.  1) Very small tip, 2)
very thin gauge solder, 3) tweezers.  The method Laura mentioned
earlier is a common one for soldering SMD devices and works quite well
(tin one pad, hold part to this pad and reflow solder, then solder all
other pads).  You don't need to invest lots of money for new equipment.

    Oh, and make sure your bench is well lit!

- Jeff, WA6AHL




From [e-mail] Wed Oct 30 06:35:41 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!news.io.com!news.fc.net!paranoia.com!filipg
From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Followup-To: rec.radio.amateur.homebrew
Date: 21 Oct 1996 12:36:43 GMT
Organization: TLJ Consulting
Lines: 17
Sender: [e-mail]
Message-ID: <54fqor$[e-mail]>
References: <53rnc7$[e-mail]> <53ust5$[e-mail]> <[e-mail]> <540np5$[e-mail]>
NNTP-Posting-Host: primus.paranoia.com
Summary: ha!

In Article <540np5$[e-mail]>, through puissant locution, dmbrodbe@mtu.
edu (David Brodbeck) soliloquized:
>Another good approach is to make the schematics available somewhere on
>the World Wide Web.  I know of several places where it's relatively easy to
>put up a small page.

Greetings. Ever check size of a good TIFF of a schematics? 4-5MB... figure
compressing to a JPG ... maybe 100-200KB... how many of these can you
fit in a 1MB account? :-| The ONLY way you can get this scheme off
the ground is to get an .edu to dedicate a few dozen MB or some
commercial company do some "PR" :-)

Take care.
--
+-->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] Wed Oct 30 06:35:42 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!news.mindspring.com!user-168-121-178-82.dialup.mindspring.com!user
From: [e-mail] (Grady Russell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is equipment building and repair a lost art? NO!
Date: Mon, 21 Oct 1996 11:02:14 -0500
Organization: Canadians for Global Warming
Lines: 34
Message-ID: <[e-mail]>
References: <53rnc7$[e-mail]> <53ust5$[e-mail]> <[e-mail]> <540np5$[e-mail]> <54fqor$[e-mail]>
NNTP-Posting-Host: user-168-121-178-82.dialup.mindspring.com
X-Server-Date: 21 Oct 1996 15:51:01 GMT

In article <54fqor$[e-mail]>, [e-mail] (Filip M
Gieszczykiewicz) wrote:

> In Article <540np5$[e-mail]>, through puissant locution,
[e-mail] (David Brodbeck) soliloquized:
> >Another good approach is to make the schematics available somewhere on
> >the World Wide Web.  I know of several places where it's relatively easy to
> >put up a small page.
>
> Greetings. Ever check size of a good TIFF of a schematics? 4-5MB... figure
> compressing to a JPG ... maybe 100-200KB... how many of these can you
> fit in a 1MB account? :-| The ONLY way you can get this scheme off
> the ground is to get an .edu to dedicate a few dozen MB or some
> commercial company do some "PR" :-)


All it takes is a little negotiation...Mindspring for instance offers 10MB
of space for your WebPage. Mindspring is a VERY large ISP that provides
access in lots of SouthEastern Cities. If you have a smaller ISP but
Mindspring access (or something similiar), tell the smaller company! They
want your business...I used to be on a server that allowed me 30MB of
diskspace for a website. How...I told them I wanted it and paid an extra
$5/month for it. I live in a small town of 40,000 and could get it
done...surely someone in a larger city with several ISP's available can do
it.

Sounds like a wonderful idea...I wished someone would pursue it!

Also...consider making it a .gif. The image is a B/W and by reducing it
down to B/W only, size will be very little...about 20K. 1024K/20K can get
50 schematics up and still have 24K for a text only webpage. Want fancier
webpage, cut down a schematic or two.

Grady


From [e-mail] Wed Oct 30 06:35:44 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-peer.sprintlink.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Is equipment building and repair a lost art? Your comments, please.
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
Date: Tue, 22 Oct 1996 15:06:59 GMT
Lines: 29

In article  [e-mail] (Jeroen BELLEMAN) writes:
>
>Plastic fiber won't pass UV light.  In fact, it will be quickly
>degraded by any UV light of useful intensity.  A quartz fiber
>might work.  Any optics in the light path would have to be quartz
>too.  Finally, plotting would have to be (very) slow to adequately
>expose the resist.

I wonder. I would assume that exposure is a function of
time * luminous flux/area. If I can expose a 3x5 board
in 10 seconds with a 60 watt sunlamp, that's 15 million
square mils. Now suppose I can concentrate that down to
a spot 50x50 mils, wouldn't that allow an exposure time
of 0.001667 second, or a plotting speed of 30 ips?

I'm not sure I could concentrate a 60 watt sunlamp down
that tightly without burning something up, but most of the
sunlamp's output isn't UV. If I used an 8 watt germicidal
lamp, it would probably put out more UV but lots less heat,
so things shouldn't melt too quickly if I concentrated that
down to a 50 mil spot. I could live with a 30 ips plotting
speed. Turn on and turn off delays would be a bigger problem.

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] Wed Oct 30 06:35:45 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.iglobal.net!news.sprintlink.net!news-fw-6.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!vixen.cso.uiuc.edu!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Paul Ostby)
Newsgroups: rec.radio.amateur.homebrew
Subject: Is equipment building and repair a lost art? Your comments, please.
Date: 24 Oct 96 05:42:32 GMT
Organization: ucsd usenet gateway
Lines: 27
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

[e-mail] (Tom Bruhns) writes:
>It may be that an inkjet printer can put down dense enough ink on a
>transparency to be used for board exposure, but I've not played with
>that.  But I do know that it's darn hard to get good enough density
>on a laser-printed transparency.  The tracing paper thing works much
>better for me.  You can get the laser printer to handle the thin paper
>by folding a leading edge over a thicker piece of paper (e.g., 20 pound
>stock).

I've used a 300 dpi laser printer on transparency film.  Never tried tracing
paper.  I tried toner transfer, but it's lousy for spacing smaller than 25 mil
.

Yes, the transparency density is marginal, especially on large copper areas.

But my wife recently bought a color inkjet printer for her business, and I'm i
n
heaven.  It's a 720 dpi Canon BJC-620 and it works *much* better than the lase
r
printer.  The ink density on transparency is substantially better than the las
er
printer's toner.  And the 720 dpi resolution is real sweet.

I haven't tried any other inkjet printers, but I'm very happy with this one.

But you must be sure to use the special transparency material made for inkjet
printers.  I tried a sheet of laser printer transparency film in the inkjet
printer and the ink clumped up in many places and ran in other places.

Paul



From [e-mail] Wed Oct 30 06:35:46 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-fw-6.sprintlink.net!moon.why.net!news
From: john fleenor <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: john's ham page
Date: Tue, 29 Oct 1996 20:19:06 -0800
Organization: The Why? Network
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: 205.240.253.48
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; U)

http://www.cyberramp.net/~johnf


From [e-mail] Wed Oct 30 06:35:47 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!feed1.news.erols.com!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!news.sprintlink.net!news-pull.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.usit.net!news
From: "J. Scott Northcutt" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Kenwood XCVR computer control
Date: Mon, 21 Oct 1996 11:00:28 -0700
Organization: Celerity
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: 204.194.173.28
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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Xref: news1.epix.net rec.radio.amateur.homebrew:20386 rec.radio.amateur.digital.misc:19735

Greetings all,

I've been kicking around the notion of controlling my old Kenwood Ts-440
HF rig with my PC.  I've found plenty of shareware programs that handle
the PC end of things, but I'm a little shy about forking over 100+ bucks
to get the official Kenwood interface box (especially since we have a
new baby at home now).  Are there kits and/or schematics for boards out
there which could replace the Kenwood box? I assume it's just a TTL to
RS-232 interface, but I'm not sure.  Also, what about the EPROMs which
plug into the radio?  Are those only available on the used market these
days?  I'd be happy to hear from anyone who uses PC control for a '440
(homebrewed or otherwise).  Thanks a lot.

73,
--Scott - AD4JR
p.s. - response via e-mail in addition to reply to the newsgroup would be
 greatly appreciated, as I check e-mail much more frequently. Thanks!

--
      J. Scott Northcutt -- Hardware Engineer, Digital Video Products
    Celerity Systems, Inc. -- Knoxville, TN -- [phone], ext. 328
e-mail: [e-mail] (wk)  OR  [e-mail]
(home)
      ham radio: AD4JR          O-            #include std_disclaim.h


From [e-mail] Wed Oct 30 06:35:48 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.kei.com!news.texas.net!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Kenwood XCVR computer control
Date: 21 Oct 1996 09:22:00 -0700
Organization: BEST Internet Communications
Lines: 40
Message-ID: <54g7v8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: shellx.best.com
Xref: news1.epix.net rec.radio.amateur.homebrew:20393 rec.radio.amateur.digital.misc:19737

In article <[e-mail]>,
J. Scott Northcutt <[e-mail]> wrote:
>Greetings all,
>
>I've been kicking around the notion of controlling my old Kenwood Ts-440
>HF rig with my PC.  I've found plenty of shareware programs that handle
>the PC end of things, but I'm a little shy about forking over 100+ bucks
>to get the official Kenwood interface box (especially since we have a
>new baby at home now).  Are there kits and/or schematics for boards out
>there which could replace the Kenwood box? I assume it's just a TTL to
>RS-232 interface, but I'm not sure.  Also, what about the EPROMs which
>plug into the radio?  Are those only available on the used market these
>days?  I'd be happy to hear from anyone who uses PC control for a '440
>(homebrewed or otherwise).  Thanks a lot.
>
>73,
>--Scott - AD4JR
>p.s. - response via e-mail in addition to reply to the newsgroup would be
> greatly appreciated, as I check e-mail much more frequently. Thanks!
>
>--
>      J. Scott Northcutt -- Hardware Engineer, Digital Video Products
>    Celerity Systems, Inc. -- Knoxville, TN -- [phone], ext. 328
>e-mail: [e-mail] (wk)  OR  [e-mail]
>(home)
>      ham radio: AD4JR         O-            #include std_disclaim.h


The external box for the '440 is nothing more than a level translator.
converts TTL on the radio side to RS-232 on the computer side. You
can use the Maxim MAX232 series ICs to do that.

I'm not aware of any EPROMS that need to installed in the radio.
In my 440, the only ICs that needed to be installed were an 8255
UART and a 4040 ripple counter if memory serves.

Good Luck

Steve Muther WF6R



From [e-mail] Wed Oct 30 06:35:49 1996
From: [e-mail] (Christer Johansson)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: L.O.S.A Contribution Form
Date: Wed, 23 Oct 1996 22:30:06 GMT
Organization: HTH
Reply-To: [e-mail]
Message-ID: <[e-mail]>
X-Newsreader: Forte Free Agent 1.1/16.230
NNTP-Posting-Host: 193.12.111.72
Lines: 84
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!news.mathworks.com!enews.sgi.com!news-feed.inet.tele.dk!cph-1.news.DK.net!dkuug!dknet!funny.bahnhof.se!seunet!news2.swip.net!news.buller.se!193.12.111.72
Xref: news1.epix.net comp.robotics.misc:9602 comp.home.automation:23606 sci.electronics.misc:16338 rec.radio.amateur.homebrew:20444

List Of Stamp Applications (L.O.S.A for short)
==============================================

If you have done something (big or small) with the BASIC Stamp
that you are willing to tell others please use the form below and
write a short description, nothing fancy is needed just a simple
explanation. If you have source code to share that's even better but
it's not necessary.

Then e-mail the form to:

     [e-mail]

With the following as the subject:

     L.O.S.A Contribution

Or you could point your Web-browser to the following URL and fill in
the L.O.S.A form on the Web-page...

     http://www.hth.com/losa.htm

The latest version of L.O.S.A is going to be posted to the following
mailing lists and news groups, I will update it approx. once a month.

Mailing lists:

BASIC Stamp Mailing List

News groups:

comp.robotics.misc
comp.home.automation
sci.electronics.misc
rec.radio.amateur.homebrew

FTP-site:

     ftp://ftp.parallaxinc.com/pub/text/losa.txt

You can also find the latest version on the following URL...

     http://www.hth.com/losa.htm


[--- cut ---]

======================================================================
                    - L.O.S.A Contribution Form -
======================================================================
 New Contribution [ ]  Update [ ]
----------------------------------------------------------------------

 Title :
 Author:                                       Date:

 E-mail: (optional)
----------------------------------------------------------------------

 Stamp model   : BASIC Stamp/BS1-IC/BS2-IC
 Code available: YES/NO
 Filename      : (optional)
 URL           : (optional)
----------------------------------------------------------------------
 Description   : (5-50 rows describing your application)


======================================================================

[--- cut ---]

If you think something are missing in the "L.O.S.A Contribution Form"
please let me know and I will add it.

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] Wed Oct 30 06:35:50 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!solaris.cc.vt.edu!usenet
From: [e-mail] (Jim Overfelt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Linear Amp. WANTED
Date: 21 Oct 1996 18:01:42 GMT
Organization: Your Organization
Lines: 3
Message-ID: <54gdq6$[e-mail]>
NNTP-Posting-Host: jimo.mine.vt.edu
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Anyone have a 3cx3000 amp or a 4cx5000 amp for sale?




From [e-mail] Wed Oct 30 06:35:51 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.vcnet.com!port46.vcnet.com!user
From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Linear Amp. WANTED
Date: Fri, 25 Oct 1996 21:17:40 -0700
Organization: Internet Access of Ventura County
Lines: 8
Message-ID: <[e-mail]>
References: <54gdq6$[e-mail]>
NNTP-Posting-Host: port46.vcnet.com

In article <54gdq6$[e-mail]>, [e-mail] (Jim Overfelt) wrote:

> Anyone have a 3cx3000 amp or a 4cx5000 amp for sale?

How about a 4CX3000A in Class AB1 grid-driven?  Drives with 150 w.  18.3db gai
n.

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Wed Oct 30 06:35:52 1996
From: [e-mail] (Don Phelps)
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Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Linear Amp. WANTED
Message-ID: <[e-mail]>
Date: Mon, 28 Oct 1996 22:30:54 GMT
Distribution: world
Organization: The Infoway BBS [phone] 28,800 8-N-1
Lines: 14

 Me> Subject: Re: Linear Amp. WANTED
 > Anyone have a 3cx3000 amp or a 4cx5000 amp for sale?

I have a pair of 4-1000's in parrallel.
Continuous coverage tuning
with very large roller inductor, two vacuum variables,
also huge power transformer etc.
Set up in 5' relay rack to wheel to your operating position.

Don, N6MCE
Near San Francisco,CA.

... [e-mail]  1:125/104 POBox 9739 San Rafael,CA 94912
___ Blue Wave/386 v2.30 [NR]


From [e-mail] Wed Oct 30 06:35:53 1996
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From: [e-mail] (Tony White)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for LOWFER experimental transmitter schematics
Date: 22 Oct 1996 23:24:55 GMT
Organization: Digitrix Microsystems
Lines: 11
Message-ID: <54jl47$[e-mail]>
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X-Newsreader: WinVN 0.99.7

I'm looking for some schematics for LOWFER experimental band transmitters.  So

far I've found only one, and certain components in the design make it less
than desirable for me to try.  Specifically, I'm wanting to try to build it
with surplus components and home-wound coils.

I've looked at several of the LOWFER-oriented WWW pages already.

If you've got something, please email me.  If you've got a schematic and can
digitize, please feel free to email attach.  If not, email me and I'll send
you a SASE.  Thanks.



From [e-mail] Wed Oct 30 06:35:54 1996
Newsgroups: rec.radio.amateur.homebrew
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From: Chris Rose <[e-mail]>
Subject: Looking for mods, gen info  on the Alinco (DJ-180) VHF  Transceiver
Message-ID: <[e-mail]>
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Does anyone have any information regarding this radio.

I just got it from a friend.

Looking for mods, power adjustments, general information.


From [e-mail] Wed Oct 30 06:35:54 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for mods, gen info  on the Alinco (DJ-180) VHF  Transceiver
Date: Wed, 30 Oct 1996 00:29:55 -0800
Organization: http://geocities.com/capecanaveral/3722
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Chris,

Try the link to radio mods from my page (I forget the exact address of
the pub).  Who knows what may show up, it is pretty big?!   ...Woody

http://www.geocities.com/capecanaveral/3722


Chris Rose wrote:
>
> Does anyone have any information regarding this radio.
>
> I just got it from a friend.
>
> Looking for mods, power adjustments, general information.

--
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] Wed Oct 30 06:35:55 1996
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From: Iwan Latev <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for smallest possible xtal osc. homebrew transmitters
Date: 22 Oct 1996 15:06:15 GMT
Organization: XS4ALL, networking for the masses
Lines: 5
Message-ID: <54int7$[e-mail]>
NNTP-Posting-Host: asd07-09.dial.xs4all.nl
X-XS4ALL-Date: Tue, 22 Oct 1996 17:06:15 MET DST

Hi i am a rc enthousiastic and i am looking for transmitters for
telemetrie use is there anybody who has a schematic for this

please write to [e-mail]



From [e-mail] Wed Oct 30 06:35:56 1996
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From: Dan Metzger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for smallest possible xtal osc. homebrew transmitters
Date: Fri, 25 Oct 1996 19:11:36 +0000
Organization: Monroe County Library
Lines: 3
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To: Iwan Latev <[e-mail]>

The ARRL handbook for 1994 has a "cubic incher" for 80, 40, & 30
meters on page 30-17, 18.It references earlier cubic inchers in QST,
Jul 82, pp 34-36, and QST Sept 1990.  -Dan, K8JWR


From [e-mail] Wed Oct 30 06:35:57 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Low dropout regulator info needed
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.homebrew
Sender: [e-mail]
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Date: Mon, 28 Oct 1996 17:35:42 GMT
Lines: 5

I need to provide 10.6v at 1.6A from a 12V lead-acid battery.
Any hints on low-dropout regulators for this application?
Regulation doesn't have to be great.

73, doug


From [e-mail] Wed Oct 30 06:35:58 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low dropout regulator info needed
Date: Wed, 30 Oct 1996 00:48:03 -0800
Organization: http://geocities.com/capecanaveral/3722
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Doug,
I couldn't locate anything to help in my data books (only a few new
enough to cover low dropout regs).  Best I could do was a 0.6 volt drop
regulator chip from TI. It would, however, only supply 750 ma.  I got
around a similar problem (ATV Tx =flaky when batt low) by building an
step-up switcher - down regulated.  It is set to supply 13 volts reg
while the input can be from about 10 to 18 volts. ...73, Woody


Doug Faunt N6TQS [phone] wrote:
>
> I need to provide 10.6v at 1.6A from a 12V lead-acid battery.
> Any hints on low-dropout regulators for this application?
> Regulation doesn't have to be great.
>
> 73, doug

--
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] Wed Oct 30 06:35:59 1996
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From: [e-mail] (Uncle)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low dropout regulator info needed
Date: Wed, 30 Oct 1996 01:42:08 GMT
Organization: Winthrop Technology
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On Mon, 28 Oct 1996 17:35:42 GMT, [e-mail] (Doug
Faunt N6TQS [phone]) wrote:

+I need to provide 10.6v at 1.6A from a 12V lead-acid battery.
+Any hints on low-dropout regulators for this application?
+Regulation doesn't have to be great.
+
+73, doug

Won't ask what 10.6v is needed for, but is the 1.6A
fairly constant?  To keep it simple, I'd be happy just
to use a simple TO-3 case pass transistor, adjust
your base voltage according to the drop across a small
series resistance, or even a stack of zeners totalling
approx 10.6 volts to the base.  For mere 1.6A, might
even get away w/o using a sink.

Refer ARRL handbook for basics regarding.

Uncle Brian  VK6BQN

    -    -    -    -
Life isn't meaningless, it just has a poor signal to noise ratio.


From [e-mail] Wed Oct 30 06:35:59 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Dave Bullock G6UWO)
Subject: magnetism immune switch
Message-ID: <[e-mail]>
Sender: [e-mail]
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Date: Thu, 24 Oct 1996 13:43:21 GMT
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Heeelllp I need to create a changeover contact in a extremely magnetic
environment. Relays are no good so I am looking for a manufacturer of
something like, a bi-metallic switch that can be operated from afar with
a built in heating element,ala car indicator flasher. Or maybe a mercury
thermometer principle switch that closes a contact as it is internally
heated. I know the latter exists but where can I get them.
Thinking caps on chaps  all suggestions greatfully accepted.
Thanks Dave.


From [e-mail] Wed Oct 30 06:36:01 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!news.monmouth.com!news
From: Robert Bissett <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: magnetism immune switch
Date: Fri, 25 Oct 1996 20:53:52 -0400
Organization: Nov Schmoz Kapop
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To: Dave Bullock G6UWO <[e-mail]>

Dave Bullock G6UWO wrote:
>
> Heeelllp I need to create a changeover contact in a extremely magnetic
> environment. Relays are no good so I am looking for a manufacturer of
> something like, a bi-metallic switch that can be operated from afar with
> a built in heating element,ala car indicator flasher. Or maybe a mercury
> thermometer principle switch that closes a contact as it is internally
> heated. I know the latter exists but where can I get them.
> Thinking caps on chaps  all suggestions greatfully accepted.
> Thanks Dave.

I have one in my hand just plucked from the socket of my amplifier power
supply. Has a 9-pin miniature base glass envelope .  Made by Amperite
and
 and has marking  6NO45T  , meaning 6 volt heater, normally open contact
 and 45 second time delay.   They were , maybe still are made in all
sorts of combinations.  Another piece of equipment I have has a 117NO30T
 one in it.  I got them many years ago, so you'll have to do some
research. Can't find them in my Allied catalog , but the solid state
substitutes are 51 bux!
--
      *********
Bob Bissett      [e-mail]
      *********


From [e-mail] Wed Oct 30 06:36:02 1996
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From: [e-mail] (Jerry Flanders)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: magnetism immune switch
Date: Sat, 26 Oct 1996 22:35:20 GMT
Organization: Info Avenue INTERNET Access
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>Dave Bullock G6UWO wrote:
>>
>> Heeelllp I need to create a changeover contact in a extremely magnetic
>> environment. Relays are no good so I am looking for a manufacturer of
>> something like, a bi-metallic switch that can be operated from afar with
>> a built in heating element,ala car indicator flasher. Or maybe a mercury
>> thermometer principle switch that closes a contact as it is internally
>> heated. I know the latter exists but where can I get them.
>> Thinking caps on chaps  all suggestions greatfully accepted.
>> Thanks Dave.
============================================================
SSR (Solid State Relay). They are available in various ratings -
inside the little brick is a light-activated electronic switch, and a
solid-state light source (a LED). You supply activating current (a few
mils at, typically, 3 to 30 volts DC, and this switches "on" the SSR.
You can get them in AC and DC models, with really usable current
ratings. I see them at hamfests often.

I have applied a few, and they are easily activated by TTL levels. I
use some that are rated at 30 Amps 240VAC.

Jerry W4UKU



From [e-mail] Wed Oct 30 06:36:03 1996
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From: Jeff Hutchinson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: magnetism immune switch
Date: Sun, 27 Oct 1996 09:24:37 -0500
Organization: Marine Electronics Services
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To: Dave Bullock G6UWO <[e-mail]>

Re your need for a switch to operate in a highly magnetnetic
environment: have you considered pneumatic operation?  There are
switches available that can be operated by changes in pressure.  Some of
them are used for detecting water in the bilges of boats, and for
actuation of bilge pumps.
Can you remotely activate the swtch by mechanical means?  If so, you
could use a mercury switch, which is basically two contacts inside a
sealed tube which contains mercury.  You rotate the tube to make or
break the circuit.
73 de Jeff W4PBC


From [e-mail] Wed Oct 30 06:36:03 1996
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From: [e-mail] (Kelly L)
Newsgroups: rec.radio.amateur.homebrew
Subject: MIC/PTT interface HTX-202
Date: 22 Oct 1996 13:31:07 GMT
Organization: Planet Access Networks - Stanhope, NJ
Lines: 26
Message-ID: <54iiar$[e-mail]>
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Help! I am trying to interface an external MIC/PTT combo to my Radio
Shack HTX-202 HT. The diagram in the book is incorrect (it just doesn't
work when wired as shown). I have taken apart one of the Mic's that RS
sells and that didn't help much (I think I diagrammed it wrong). This is
how it appeared to me:


  Mic -     Mic+
  |          |
  +----||----+
  |    0.1uF |
  |          |
  +--/\/\/\--+
  |   2.2k   |
  |          |
  |          |
  |          \ (PTT)
  |          |
  |          |
  Shield    Tip

Where did I go wrong (and don't tell me it was buying RS in the first place).

Thanks for the help,
73 de Kelly
KB2SYD


From [e-mail] Wed Oct 30 06:36:04 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: MIC/PTT interface HTX-202
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54iiar$[e-mail]>
Date: Wed, 23 Oct 1996 15:21:56 GMT
Lines: 45

In article <54iiar$[e-mail]> [e-mail] (Kelly L) writes:
>Help! I am trying to interface an external MIC/PTT combo to my Radio
>Shack HTX-202 HT. The diagram in the book is incorrect (it just doesn't
>work when wired as shown). I have taken apart one of the Mic's that RS
>sells and that didn't help much (I think I diagrammed it wrong). This is
>how it appeared to me:
>
>
>  Mic -     Mic+
>  |          |
>  +----||----+
>  |    0.1uF |
>  |          |
>  +--/\/\/\--+
>  |   2.2k   |
>  |          |
>  |          |
>  |          \ (PTT)
>  |          |
>  |          |
>  Shield    Tip
>
>Where did I go wrong (and don't tell me it was buying RS in the first place).

The 2.2 k resistor forms the "leaky PTT" for the radio, and is configured
properly. The radio should be going into transmit with the circuit as shown
when you close the PTT switch.

If it is a dynamic element you're trying to use, the capacitor
needs to be in series with it rather than in shunt, and probably
should be a larger value as well. If you're trying to use an electret
element, the circuit should work as shown if the FET preamp is built
into the element, though I'd drop the shunt capacitor value to 0.001uF.
If the element doesn't have a built in preamp, you'll need to add one
to boost its output up enough to drive the radio. You need about
100 mV peak to peak to drive the radio to 5 kHz deviation. If your
mic element is putting out lots less than that, it won't do without
an added preamp.

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] Wed Oct 30 06:36:05 1996
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From: [e-mail] (lbliao)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Microphone Capsules
Date: 26 Oct 1996 02:12:40 GMT
Organization: California Institute of Technology, Alumni Association
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Xref: news1.epix.net sci.electronics.design:23850 sci.electronics.misc:16381 rec.radio.swap:92446 rec.radio.amateur.homebrew:20482

Besides Radio Shack, I wonder which companies sell capsule microphones and
provide good application notes etc on them. Some capsules have some kind of
preamplifier JFET in them, and others do not. I am looking for a good source
on both of them. Looking through Thomas Catalog, I could not find a good
source though.

Thanks a lot!
lbliao




From [e-mail] Wed Oct 30 06:36:06 1996
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From: [e-mail] (John Lundgren)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: Microphone Capsules
Followup-To: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Date: 26 Oct 1996 20:15:21 GMT
Organization: Delta Internet Services, Anaheim, CA
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Xref: news1.epix.net sci.electronics.design:23911 sci.electronics.misc:16427 rec.radio.swap:92533 rec.radio.amateur.homebrew:20508

lbliao ([e-mail]) wrote:
: Besides Radio Shack, I wonder which companies sell capsule microphones and
: provide good application notes etc on them. Some capsules have some kind of
: preamplifier JFET in them, and others do not. I am looking for a good source
: on both of them. Looking through Thomas Catalog, I could not find a good
: source though.

: Thanks a lot!
: lbliao


AFAIK, all the Radio Shack microphones have the FET built-in.  That's
because the impedance of the electret mic itself is several hundreds of
megohms and can't drive a signal any distance because of the capacitance.
So the amplifier has to be very close to or inside the mic element.

--
#===================================================================#
|    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|
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From [e-mail] Wed Oct 30 06:36:08 1996
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From: [e-mail] (Greg J Szekeres)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: Microphone Capsules
Date: 27 Oct 1996 00:54:47 GMT
Organization: University of Pittsburgh
Lines: 41
Message-ID: <54ubsn$[e-mail]>
References: <54rs2o$[e-mail]>
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In article <54rs2o$[e-mail]>,
lbliao <[e-mail]> wrote:
 >Besides Radio Shack, I wonder which companies sell capsule microphones
 and
 >provide good application notes etc on them. Some capsules have some kind
 of
 >preamplifier JFET in them, and others do not. I am looking for a good
 source
 >on both of them. Looking through Thomas Catalog, I could not find a good
 >source though.
 >
 >Thanks a lot!
 >lbliao


Well, the Panasonic electret capsules are available through Digi-Key.
They started making their "flat" capsule about 12 years
ago. The original capsule has been discontinued and two
other models have taken its place. Most of the other common
capsules in the market don't have near the flatness in response.
I saw this when I saw the Digi-Key catlog and prompted me to
use and write up some applications which appeared in Speaker
Builder magazine around 1985. Alot of the larger less
accurate capsules have peaking around 6-7 Khz. Digi-Key
shows a simple circuit in their catalog. I don't know if
Panasonic offers any better data sheets or applications.
The use of the capsule will determine much of its performance
value. There is also another fellow who made up a version
called the Mighty Mike. That article and kit was in Speaker
Builder magazine and a kit available through the Old Colony
outlet. I don't know if there is an equivalent capsule
manufacturer. Most of the better ones achieve better S/N
ratio but are made by microphone companies. There is a fellow
on alt.sci.physics.acoustics, Johanson, who is
in the microphone business. Perhaps you could try that
group also.

greg

http://www.pitt.edu/~szekeres



From [e-mail] Wed Oct 30 06:36:08 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!dobie.loop.net!pma2_109
From: [e-mail] (King Kamehameha)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: Microphone Capsules
Date: Sun, 27 Oct 96 18:20:15 GMT
Organization: The Wholly Organised Society For The Study Of Lamprey Morality, Pty., Ltd.
Lines: 31
Distribution: world
Message-ID: <550itl$[e-mail]>
References: <54rs2o$[e-mail]> <54trgp$[e-mail]>
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In article <54trgp$[e-mail]>,
   [e-mail] (John Lundgren) wrote:
>lbliao ([e-mail]) wrote:
>: Besides Radio Shack, I wonder which companies sell capsule microphones and
>: provide good application notes etc on them. Some capsules have some kind of
>: preamplifier JFET in them, and others do not. I am looking for a good
source
>: on both of them. Looking through Thomas Catalog, I could not find a good
>: source though.
>
>: Thanks a lot!
>: lbliao
>
>
>AFAIK, all the Radio Shack microphones have the FET built-in.  That's
>because the impedance of the electret mic itself is several hundreds of
>megohms and can't drive a signal any distance because of the capacitance.
>So the amplifier has to be very close to or inside the mic element.

Try Digi-key. They have several. I believe, but can't say with certainty, they

are made by Panasonic. (Catalog's at work where I need it more.)

--
Matt

     ########################################
     # I fix broken computers   # Reply to  #
     # I can break them as well # ke6alm    #
     #.I.will.not.tolerate.SPAM.#[e-mail] #
     ########################################



From [e-mail] Wed Oct 30 06:36:09 1996
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From: [e-mail] (David)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: Microphone Capsules
Date: Mon, 28 Oct 1996 00:45:17 GMT
Organization: AT&T WorldNet Services
Lines: 21
Message-ID: <[e-mail]>
References: <54rs2o$[e-mail]>
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Xref: news1.epix.net sci.electronics.design:24033 sci.electronics.misc:16491 rec.radio.swap:92748 rec.radio.amateur.homebrew:20541

Capsule microphones?  Do you mean Electret microphones?  If so,
Digikey carries them by Panasonic.  You can get spec sheets from
Digi-Key also for $1.00.  Don't know if it will have apps notes in it
though.
Dave
DSchmidt Technologies

On 26 Oct 1996 02:12:40 GMT, [e-mail] (lbliao)
wrote:

>Besides Radio Shack, I wonder which companies sell capsule microphones and
>provide good application notes etc on them. Some capsules have some kind of
>preamplifier JFET in them, and others do not. I am looking for a good source
>on both of them. Looking through Thomas Catalog, I could not find a good
>source though.
>
>Thanks a lot!
>lbliao
>
>



From [e-mail] Wed Oct 30 06:36:10 1996
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From: [e-mail] (Tom Bruhns)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: Microphone Capsules
Followup-To: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Date: 28 Oct 1996 19:10:06 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 16
Message-ID: <5530ee$[e-mail]>
References: <54rs2o$[e-mail]>
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Xref: news1.epix.net sci.electronics.design:24036 sci.electronics.misc:16492 rec.radio.swap:92749 rec.radio.amateur.homebrew:20542

lbliao ([e-mail]) wrote:
: Besides Radio Shack, I wonder which companies sell capsule microphones and
: provide good application notes etc on them. Some capsules have some kind of
: preamplifier JFET in them, and others do not. I am looking for a good source
: on both of them. Looking through Thomas Catalog, I could not find a good
: source though.

On the off chance you are interested in things besides just the
electret mics (which others have answered about), you can find
dynamic mic elements at places like Mouser, I believe; at least
you could in the past.

--
Cheers,
Tom
[e-mail]


From [e-mail] Wed Oct 30 06:36:11 1996
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From: [e-mail] (Charles T. Young)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: Microphone Capsules
Followup-To: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Date: 26 Oct 1996 21:42:41 -0400
Organization: Michigan Technological University
Lines: 20
Message-ID: <54uemh$[e-mail]>
References: <54rs2o$[e-mail]>
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lbliao ([e-mail]) wrote:
: Besides Radio Shack, I wonder which companies sell capsule microphones and
: provide good application notes etc on them. Some capsules have some kind of
: preamplifier JFET in them, and others do not. I am looking for a good source
: on both of them. Looking through Thomas Catalog, I could not find a good
: source though.
:
: Thanks a lot!
: lbliao
:
:

Look at the DigiKey catalog. They sell microphone capsuels for 70 cents to $2.
00
depending on the frequency response needed etc. The mikes are made by Panasoni
c.
I noticed that DigiKey has a web site: http://www.digikey.com

have fun

Chuck Young



From [e-mail] Wed Oct 30 06:36:12 1996
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From: [e-mail] (Jeff Johnson)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.m
Followup-To: rec.antiques.radio+phono,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Date: 23 Oct 1996 16:19:54 GMT
Organization: Internet Interstate - Metropolitian Washington, DC -*- 301.652.IINT
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[e-mail] wrote:
: Sub-mini tubes were small "pencil" sized tubes, about 1/3 inch diamenter
: > and ranging from 3cm to 5 cm tall.  Mostly found in military surplus
: > "boatanchor" radios of more recent tube vintage.  I could post some
: > info on various tubes, I have a manual that includes some sub-mini's.

: Well, in my day, early 60's they were being used as television antenna pre-a
mps
: and called Nuvistors. That was almost the last hold out of tubes until those

: silly-assed 5 functions in one tube compactrons came out. Fortunately those
: only lasted a few years, since almost every one was proprietary.

: Bill Baka

The Nuvistors I have seen are metal tubes that were smaller than
the (glass) pencil tubes.  The pencil tubes have leads that were
either all in a row, or all on the circumference of a circle;
the nuvistor pins were arranged differently.

--
Andrew Mitz
[e-mail]
Bethesda, MD


From [e-mail] Wed Oct 30 06:36:13 1996
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.m
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]>
Date: Wed, 23 Oct 1996 15:50:39 GMT
Lines: 37
Xref: news1.epix.net rec.antiques.radio+phono:30567 rec.radio.amateur.boatanchors:195 rec.radio.amateur.homebrew:20433

In article <[e-mail]> [e-mail] writes:
>Sub-mini tubes were small "pencil" sized tubes, about 1/3 inch diamenter
>> and ranging from 3cm to 5 cm tall.  Mostly found in military surplus
>> "boatanchor" radios of more recent tube vintage.  I could post some
>> info on various tubes, I have a manual that includes some sub-mini's.
>
>Well, in my day, early 60's they were being used as television antenna pre-am
ps
>and called Nuvistors. That was almost the last hold out of tubes until those
>silly-assed 5 functions in one tube compactrons came out. Fortunately those
>only lasted a few years, since almost every one was proprietary.
>
>Bill Baka

Nuvistors are different from the pencil tubes (which are older). The
Nuvistor had a metal envelope and a form factor like a fat TO-5 transistor.
The pencil tubes have a glass envelope, and are tall and slender with wire
leads coming out one end. AFAIK Nuvistors were only offered as triodes,
with the 6CW4 being the most popular, but the pencil tubes came as tetrodes
and pentodes too (some with leads coming out both ends, some with contacts
which snapped into a holder like a fuse). The Nuvistor worked well at VHF,
but the pencil tubes didn't (too much lead inductance).

There were also planar tubes, some of which slightly resembled the pencil
tubes, except that they had a grid disc in the middle, and those did work
well at VHF and UHF. Other planar tubes, such as the gold plated WE416B,
looked more like a Nuvistor on steroids, though it had a grid ring and a
plate cap. These would work up into the low GHz. Other planar tubes were
called lighthouse tubes, and also worked up into the GHz. The metal/glass
2C39 is a popular example, since superceded by the metal/ceramic 3CX100A5
which is still used as a power amplifier tube at L band.

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] Wed Oct 30 06:36:16 1996
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From: [e-mail]
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.m
Date: Tue, 22 Oct 96 15:47:11 GMT
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References: <[e-mail]>
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Xref: news1.epix.net rec.antiques.radio+phono:30579 rec.radio.amateur.boatanchors:196 rec.radio.amateur.homebrew:20434

Sub-mini tubes were small "pencil" sized tubes, about 1/3 inch diamenter
> and ranging from 3cm to 5 cm tall.  Mostly found in military surplus
> "boatanchor" radios of more recent tube vintage.  I could post some
> info on various tubes, I have a manual that includes some sub-mini's.

Well, in my day, early 60's they were being used as television antenna pre-amp
s
and called Nuvistors. That was almost the last hold out of tubes until those
silly-assed 5 functions in one tube compactrons came out. Fortunately those
only lasted a few years, since almost every one was proprietary.

Bill Baka



From [e-mail] Wed Oct 30 06:36:17 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!borowski
From: [e-mail] (Don Borowski)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.m
Followup-To: rec.antiques.radio+phono,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Date: 24 Oct 1996 16:41:38 GMT
Organization: Hewlett-Packard, Spokane Division
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Gary Coffman wrote:

>In article <[e-mail]> [e-mail] writes:
>>Sub-mini tubes were small "pencil" sized tubes, about 1/3 inch diamenter
>>> and ranging from 3cm to 5 cm tall.  Mostly found in military surplus
>>> "boatanchor" radios of more recent tube vintage.  I could post some
>>> info on various tubes, I have a manual that includes some sub-mini's.
>>
>>Well, in my day, early 60's they were being used as television antenna pre-a
mps
>>and called Nuvistors. That was almost the last hold out of tubes until those

>>silly-assed 5 functions in one tube compactrons came out. Fortunately those
>>only lasted a few years, since almost every one was proprietary.
>>
>>Bill Baka
>
>Nuvistors are different from the pencil tubes (which are older). The
>Nuvistor had a metal envelope and a form factor like a fat TO-5 transistor.
>The pencil tubes have a glass envelope, and are tall and slender with wire
>leads coming out one end. AFAIK Nuvistors were only offered as triodes,
>with the 6CW4 being the most popular, but the pencil tubes came as tetrodes
>and pentodes too (some with leads coming out both ends, some with contacts
>which snapped into a holder like a fuse). The Nuvistor worked well at VHF,
>but the pencil tubes didn't (too much lead inductance).

There was a tetrode Nuvistor, the 7587.  The plate connection comes out
as the top half the the body--there is a ceramic spacer between the
upper and lower half of the body.

The Nuvistor has construction different from other tubes.  The active elements
are cantilevered off of the ceramic base.  There are concentric rings of
pins in the ceramic base, three pins per ring.  A cone-shaped element
support is welded to the group of three pins proper to the element.  The
other end of the cone ends up at the necessary diameter for the cathode,
grid, or plate.  On the outside of the base, two of the three pins are
then cut off.  The stubs are still there, and do make electrical connection.

The heater connections are not located on a ring--there are just two
pins in the center of the rings.

The cantilever construction does make the Nuvistor rather microphonic.

>There were also planar tubes, some of which slightly resembled the pencil
>tubes, except that they had a grid disc in the middle, and those did work
>well at VHF and UHF. Other planar tubes, such as the gold plated WE416B,
>looked more like a Nuvistor on steroids, though it had a grid ring and a
>plate cap. These would work up into the low GHz. Other planar tubes were
>called lighthouse tubes, and also worked up into the GHz. The metal/glass
>2C39 is a popular example, since superceded by the metal/ceramic 3CX100A5
>which is still used as a power amplifier tube at L band.

Donald Borowski    WA6OMI    Hewlett-Packard, Spokane Division
"Angels are able to fly because they take themselves so lightly."
                                       -G.K. Chesterton



From [e-mail] Wed Oct 30 06:36:18 1996
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From: "Ron Myers" <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.m
Date: 27 Oct 1996 03:56:05 GMT
Organization: Consultant
Lines: 33
Message-ID: <01bbc3ba$9b0a56a0$4b094ace@ronmyers>
References: <[e-mail]> <[e-mail]> <54lgja$[e-mail]>
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Jeff Johnson <[e-mail]> wrote in article <54lgja$[e-mail]>...
> [e-mail] wrote:
> : Sub-mini tubes were small "pencil" sized tubes, about 1/3 inch
diamenter
> : > and ranging from 3cm to 5 cm tall.  Mostly found in military surplus
> : > "boatanchor" radios of more recent tube vintage.  I could post some
> : > info on various tubes, I have a manual that includes some sub-mini's.

>
> : Well, in my day, early 60's they were being used as television antenna
pre-amps
> : and called Nuvistors. That was almost the last hold out of tubes until
those
> : silly-assed 5 functions in one tube compactrons came out. Fortunately
those
> : only lasted a few years, since almost every one was proprietary.
> ***  compactrons were developed by and for the germans where radios were
taxed for the number of glass envelops in a radio, not by how much they
cost ... QED.
> : Bill Baka
>
> The Nuvistors I have seen are metal tubes that were smaller than
> the (glass) pencil tubes.  The pencil tubes have leads that were
> either all in a row, or all on the circumference of a circle;
> the nuvistor pins were arranged differently.
>
> --
> Andrew Mitz
> [e-mail]
> Bethesda, MD
>


From [e-mail] Wed Oct 30 06:36:19 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!metro.atlanta.com!cpk-news-feed3.bbnplanet.com!news.intr.net!sheldon!jbj
From: [e-mail] (Jeff Johnson)
Newsgroups: rec.radio.amateur.boatanchors,rec.antiques.radio+phono,rec.radio.amateur.homebrew
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.misc ng
Followup-To: rec.radio.amateur.boatanchors,rec.antiques.radio+phono,rec.radio.amateur.homebrew
Date: 21 Oct 1996 13:10:26 GMT
Organization: Internet Interstate - Metropolitian Washington, DC -*- 301.652.IINT
Lines: 34
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References: <[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.boatanchors:158 rec.antiques.radio+phono:30448 rec.radio.amateur.homebrew:20382

Robert Casey ([e-mail]) wrote:
: As per the usenews standard procedure, I posted the binary images
: in the binaries group: alt.binaries.pictures.misc  and not in this
: non-binary group here.  Images of an ordinary AM tube radio of the
: late 50's that I modified to use sub-mini vacuum tubes.  Bear with
: my satisfaction on the success of this silly project.  Anyway, I
: changed the IF amp tube's grid bias from ground to the AVC line
: (bias thru the 1st IF secondary, that is).  So, that's what's
: different from 2 weeks ago.

: Image of the radio insides with the sub-mini's in place, another
: image of the schematic of this radio.
: This might have been the next generation of radio electronics,
: if transistors had not been developed.

: Sub-mini tubes were small "pencil" sized tubes, about 1/3 inch diamenter
: and ranging from 3cm to 5 cm tall.  Mostly found in military surplus
: "boatanchor" radios of more recent tube vintage.  I could post some
: info on various tubes, I have a manual that includes some sub-mini's.

I have an interest in these wire-base tubes.  They had a brief
existance.  I understand that they were used in portable
applications like 2-way radios, hearing aids and model
airplanes.  I don't expect that there will ever be a big demand
for these, but I am trying to keep a stock of them for people
who have use, and I will gladly accept them from anyone who
is ready to discard them.

-- Andy

--
Andrew Mitz
[e-mail]
Bethesda, MD


From [e-mail] Wed Oct 30 06:36:20 1996
Path: news1.epix.net!news3.epix.net!uunet!news-in2.uu.net!feed1.news.erols.com!arclight.uoregon.edu!dispatch.news.demon.net!demon!g3vkm.demon.co.uk!Basford
From: Roger Basford <[e-mail]>
Newsgroups: rec.radio.amateur.boatanchors,rec.antiques.radio+phono,rec.radio.amateur.homebrew
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.misc ng
Date: Mon, 21 Oct 1996 14:51:30 +0100
Organization: Home
Lines: 46
Distribution: world
Message-ID: <hUyx3GAi$[e-mail]>
References: <[e-mail]> <54fso2$[e-mail]>
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In article <54fso2$[e-mail]>, Jeff Johnson <[e-mail]>
writes
>Robert Casey ([e-mail]) wrote:
>: As per the usenews standard procedure, I posted the binary images
>: in the binaries group: alt.binaries.pictures.misc  and not in this
>: non-binary group here.  Images of an ordinary AM tube radio of the
>: late 50's that I modified to use sub-mini vacuum tubes.  Bear with
>: my satisfaction on the success of this silly project.  Anyway, I
>: changed the IF amp tube's grid bias from ground to the AVC line
>: (bias thru the 1st IF secondary, that is).  So, that's what's
>: different from 2 weeks ago.
>
>: Image of the radio insides with the sub-mini's in place, another
>: image of the schematic of this radio.
>: This might have been the next generation of radio electronics,
>: if transistors had not been developed.
>
>: Sub-mini tubes were small "pencil" sized tubes, about 1/3 inch diamenter
>: and ranging from 3cm to 5 cm tall.  Mostly found in military surplus
>: "boatanchor" radios of more recent tube vintage.  I could post some
>: info on various tubes, I have a manual that includes some sub-mini's.
>
>I have an interest in these wire-base tubes.  They had a brief
>existance.  I understand that they were used in portable
>applications like 2-way radios, hearing aids and model
>airplanes.  I don't expect that there will ever be a big demand
>for these, but I am trying to keep a stock of them for people
>who have use, and I will gladly accept them from anyone who
>is ready to discard them.
>
>-- Andy
>
I came across a British military "boatanchor" recently that used this
series of tubes, the A43R transceiver. Also, I worked in the 60's and
70's on a navigation system (Decca Hifix) that used these extensively.
They were also used in the UK as well for "deaf-aids" in the 50s, my
grandad had one which needed regular battery changes! If I ever get any
info on the A43R I might be chasing you for some spares!

73, Roger G3VKM


                *///////////////////////////////////////*
                *   e-mail: [e-mail]   *
                * Roger Basford, Haddiscoe, Norfolk U.K.*
                *///////////////////////////////////////*


From [e-mail] Wed Oct 30 06:36:21 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.erols.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!01-newsfeed.univie.ac.at!02-newsfeed.univie.ac.at!newsfeed.sunet.se!news00.sunet.se!sunic!mn6.swip.net!mn5.swip.net!news
From: [e-mail] (Anders Harwe)
Newsgroups: rec.radio.amateur.boatanchors,rec.antiques.radio+phono,rec.radio.amateur.homebrew
Subject: Re: Modified AM tube radio using sub-mini tubes, pix in a.b.p.misc ng
Date: 21 Oct 1996 20:54:36 GMT
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In article <[e-mail]>, [e-mail] says...
>
>As per the usenews standard procedure, I posted the binary images
>in the binaries group: alt.binaries.pictures.misc  and not in this
>non-binary group here.



When and under what title, I can┤t find it.

It shows the fact does we need an own binaries newsgroup.

Anders



From [e-mail] Wed Oct 30 06:36:22 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!howland.erols.net!news-peer.gsl.net!news.gsl.net!hammer.uoregon.edu!news.uoregon.edu!kaiwan.kaiwan.com!grinder!darryl.linkow
From: [e-mail] (DARRYL LINKOW)
Newsgroups: rec.radio.amateur.homebrew
Subject: Mods wanted for Standard
Message-ID: <[e-mail]>
Date: Fri, 25 Oct 96 22:31:00 -0800
Distribution: world
Organization: The Grinder_Simi Valley,CA_805-583-5833
Reply-To: [e-mail] (DARRYL LINKOW)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 6


Anyone have any mods for the Standard C5900DA tri-bander?  If so,
please post here or Email me.  73, Darryl KE6IHA

---
 * OLX 2.2 * Darryl Linkow [phone]  9 am - 5 pm PDT


From [e-mail] Wed Oct 30 06:36:23 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Modulated CW for FM Transceivers
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]>
Date: Thu, 24 Oct 1996 16:53:41 GMT
Lines: 57

In article <[e-mail]> [e-mail] (Mar
k K Flanagan) writes:
>Hello,
>
>I'm looking for a simple circuit that can be built to generate modulated
>CW tones
>for an FM transceiver and also has a PTT delay feature that would allow
>the use
>of a straight key or keyer/paddle combo to send MCW in semi-break in
>style.

Sounds like a job for a dual 555 timer chip. Run one section astable
as your tone generator, and run the other as a retriggerable monostable
with a time constant set for the hang time you want. The first section
feeds the FM rig's audio input and the second feeds its PTT. Key closure
gates the astable tone, and starts the monostable.

>We are attempting to get more new HAMs involved in CW and presently they
>need
>to pass a 5 wpm before they can even practice on the air.  If only
>someone made
>cheap VHF QRP CW rigs or kits like everybody and his brother does for HF.

Sounds like a club project. Some of the FM receiver on a chip
chips have a RSSI output. The Moto MC13135 does, and it has a
frequency response out to 80 kHz. That'll recover the keying
waveform of a CW transmitter. Just let it drive a 555 astable
to create a regenerated tone to be copied, or feed it to a
microprocessor for automatic code reception.

The transmitter can be any keyed RF source. The MC2800 will do,
or you can use traditional discrete osc -> multiplier -> PA
style construction for the transmitter. A hand key or a
microprocessor can generate the keying waveform.

Crystal control is best for simplicity of netting the units.

An alternative is a simple transverter, such as the Hamtronics
kit, used in front of any of the 10m QRP rigs. After they pass
the 5 WPM, they can use the 10m QRP rig directly too.

Or, you can use the R2 and T2 (kits available from Kanga), and
supply a LO yourself. They're good up to 500 MHz depending on
the LO you choose. These beauties can also be used on HF after
the code test is out of the way, and they'll do SSB, FSK, or
PSK too, IE they're I/Q radios and can handle any arbitrary
modulation form you wish.

You've got plenty of choices. You don't have to stick with FM MCW,
though that is simple if you already have FM transceivers, and that'll
let you use repeaters for range extension too.

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] Wed Oct 30 06:36:24 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!insync!gryphon.phoenix.net!news.sprintlink.net!news-fw-12.sprintlink.net!treasure.coastalnet.com!usenet
From: Bill Downes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: National NCSixty SPECIAL
Date: 30 Oct 1996 00:05:19 GMT
Organization: Global Information Exchange Corp.
Lines: 2
Message-ID: <55663v$[e-mail]>
NNTP-Posting-Host: pm-wlsn1-23.coastalnet.com

Help!Need manual for SixtySpecial &12be6 tube.
[e-mail]    (919-206-1618)


From [e-mail] Wed Oct 30 06:36:24 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!dispatch.news.demon.net!demon!chubs.demon.co.uk!Steve
From: Steve Simpson <[e-mail]>
Newsgroups: uk.radio.amateur,rec.radio.amateur.homebrew
Subject: Need FT-470 Manual Urgently
Date: Fri, 25 Oct 1996 17:32:03 +0100
Organization: Chubby Programming
Lines: 14
Distribution: world
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I still need this manual.

Just the CCT would do. Can anyone help at all?

Please,

Pretty Please!!!

--
Steve "Chubby" Simpson
HTML Programmer/Night Club D.J.
[e-mail]
G7NAY@GB7MSW.#33.GBR.EU
HTTP://www.chubs.demon.co.uk


From [e-mail] Wed Oct 30 06:36:25 1996
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From: Michael J Wooding <[e-mail]>
Newsgroups: uk.radio.amateur,rec.radio.amateur.homebrew
Subject: Re: Need FT-470 Manual Urgently
Date: Sat, 26 Oct 1996 21:40:36 +0100
Organization: VHF Communications Magazine
Lines: 23
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
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In article <[e-mail]>, Steve Simpson
<[e-mail]> writes
>I still need this manual.
>
>Just the CCT would do. Can anyone help at all?
>
>Please,
>
>Pretty Please!!!

Hi Steve,

Send me an A4 SAE to the address below and I will send you a photocopy
of the complete manual and cct.

Regards ... 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] Wed Oct 30 06:36:26 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!news-stkh.gsl.net!news.gsl.net!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!troll.powertech.no!usenet
From: Karl Martin Gjestrum <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need info on QB4/1100
Date: Tue, 22 Oct 1996 21:12:01 +0200
Organization: Kalles Surfeklubb DELUXE
Lines: 9
Message-ID: <[e-mail]>
Reply-To: [e-mail]
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I have a friend with a homebuilt linear amp for 80-10M. It uses a
phillips QB4/1100 tube. He need all possible info on the tube,and  he
wonder if the 3-500z is possible to use. he also need schematic for
qb4/1100  (socket configuration and power specs.) He would like to know
if the 3-500z is a possible replacement. And would also like to know
about any possible replacement tubes. Or even better compatible tubes
with a higher power rating.

Best 73 de Karl, LA7EJA


From [e-mail] Wed Oct 30 06:36:27 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!news.pubnix.net!usenet
From: Mark Hillier <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Measurements Corp. Manual
Date: Thu, 24 Oct 1996 17:00:46 -0400
Organization: HVW Technologies
Lines: 13
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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X-Mailer: Mozilla 2.01 (Win16; I)

I am looking for a Measurements Corp. Model 58 UHF Field Strength Meter
Manual.

I would prefer an original (who wouldn't ?) but would be very happy to
have at least a copy.

Will buy original or pay for copies + any postage.

Much appreciated.

73 de VE2HVW

[e-mail]


From [e-mail] Wed Oct 30 06:36:28 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Rory Davis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need RF connector
Date: 22 Oct 96 21:39:59 GMT
Organization: ucsd usenet gateway
Lines: 23
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hello all:

I'm looking for a U.S. source for the PC mount RF connectors used by ICOM
and other manufacturers for inter-board coaxial connections. These
are the jacks that are about .35" high, .15" shell inside diameter,
center pin .06" diameter. Mounting tabs are .2" apart for the shell,
with the center pin connection offset .1" between them (in a
triangular shape).  Material is silver plated. Insulator looks like
nylon.

The mating plug crimps to RG-174 (in the Icom rigs it's grey cable).

Can anyone come up with the manufacturer and part number, maybe a
distributor? Icom America stocks them in small quantities, but the
folks there don't have a clue as to who makes them.

BTW, I need over a thousand of them. (sheesh...)

73
Rory N7CR

[e-mail]



From [e-mail] Wed Oct 30 06:36:29 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!cam-news-hub1.bbnplanet.com!uunet!in1.uu.net!squirrel.imaxx.net!usenet
From: "Charles H. Reichert" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: New Ham Site
Date: Sun, 27 Oct 1996 00:45:01 -0500
Organization: American Intermaxx, Inc... IMAXX.NET
Lines: 15
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: d1025.imaxx.net
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Xref: news1.epix.net rec.radio.amateur.homebrew:20522 rec.radio.amateur.equipment:41273

FYI

I've just started up a new WWW site for hams at:

http://www.imaxx.net/~kd9jq

Will be passing along over 30 yr=ears of homebrewing
information, circuits, techniques, software, etc.
I have provided some circuits and will be adding more.
Also I have available at the site free DOS software
useable for design (Preamp, Linear Amps, PLL, Misc).

Comments/Questions welcome at [e-mail]

        73  Chuck KD9JQ


From [e-mail] Wed Oct 30 06:36:29 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!newsfeed.internetmci.com!in3.uu.net!news.alt.net!newspost1.alt.net!usenet
From: [e-mail] (Mark Gierhart)
Newsgroups: rec.radio.amateur.homebrew
Subject: New HamRadio Page
Date: 22 Oct 1996 11:20:07 GMT
Organization: The Gierhart Family Inn
Lines: 8
Message-ID: <54ial7$[e-mail]>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

  Just put up a new site at  http://alpha.wcoil.com/~markg/hamradio/main.html


  Will be posting some homebrew info, schematics misc....

                          Mark Gierhart
                            (KE8MB)



From [e-mail] Wed Oct 30 06:36:30 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!shore!northshore.shore.net!not-for-mail
From: [e-mail] (Michael Crestohl)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: New Newsgroup
Date: 22 Oct 1996 05:54:47 -0400
Organization: Shore.Net; a service of Eco Software, Inc. ([e-mail])
Lines: 11
Distribution: inet
Message-ID: <54i5l7$[e-mail]>
References: <548uk3$[e-mail]> <54h6r9$[e-mail]>
NNTP-Posting-Host: shell1.shore.net
Xref: news1.epix.net rec.radio.amateur.homebrew:20410 rec.radio.amateur.misc:116896

The boatanchors newsgroup is called rec.radio.amateur.boatanchors - and
you subscribe using your newsreader program.  The information file that
was posted refers to the Boatanchors-List, a fine-business mailing list
that has been around since August 1992 and is an excellent resource on the
subject.  The two are not the same - one is a mail reflector and the other
is a usenet newsgroup.

73,

Michael Crestohl, KH6KD/W1
[e-mail]


From [e-mail] Wed Oct 30 06:36:31 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!newsfeed.direct.ca!nntp.portal.ca!news.bc.net!news.insinc.net!news1.planeteer.com!news
From: [e-mail] (ray)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: New online survey asks--->Why aren't you an ARRL member?
Date: Thu, 24 Oct 1996 06:30:53 GMT
Organization: Pacific Image Communications Inc.
Lines: 35
Message-ID: <54n376$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: io2p17.ark.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Raymond Sarrio) wrote:


>The ham Poll at (www.sarrio.com) shown below asks a new question for the
>month of October:

>Why Have You Not Chosen To Join The ARRL?

>Less than 1/3 of all ham radio operators are members of the ARRL. The
>question for this month is
>directed to those of you who are not members.

>From the list of possible reasons below, select the reason that best
>describes why you have not chosen the join the ARRL.

>Results as of Oct. 16,1996

>The most results as ofhe dues are too high. |************ 12
>Their Ham policy positions are not close to mine.|****** 6
>They are too closely tied to ham commercial interests. | 0
>I was not treated well by one of their representatives.|* 1
>I just haven't gotten around to it.                    |******** 8

>Total votes displayed: 27
>--
>The Raymond Sarrio Co. a full feature Ham Radio Storefront and web site devel
oper. Located at http://www.sarrio.com.

>In association with Brillar Enterprises http://win-win.com/brillar provider o
f discount CD-Roms!
>
 Greetings,
    If you think things are bad re: national membership in the USA.
Radio Amateurs of Canada have approximately 20 percent membership of
all Canadian hams.
  73.  Ray.  VE7FBJ.



From [e-mail] Wed Oct 30 06:36:32 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!arclight.uoregon.edu!dispatch.news.demon.net!demon!netcom.net.uk!ix.netcom.com!tor-nn1.netcom.ca!torfree!freenet.toronto.on.ca!au127
From: [e-mail] (Jeremy Craigs)
Subject: Newbie needs info!
Message-ID: <[e-mail]>
Sender: [e-mail] (Jeremy Craigs)
Reply-To: [e-mail] (Jeremy Craigs)
Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada
Date: Mon, 28 Oct 1996 22:18:15 GMT
Lines: 12


Could some one send me/point me towards some FAQ's re:radio?
My main interest is reception at the moment, with transmission
to come later.

any help would be appreciated.
[e-mail]
--
Jeremy Craigs  [e-mail]
Ask me no questions, I'll tell you no lies.

And now, for something completely different...


From [e-mail] Wed Oct 30 06:36:33 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!news-hk.gsl.net!news.gsl.net!newsgate.cuhk.edu.hk!news.att.net.hk!spinnews!attnet-ykt0!newsadm
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: opening  ICOM  battery pack BP84?
Date: Tue, 22 Oct 1996 08:27:09 GMT
Organization: AT&T Internet Service
Lines: 26
Message-ID: <54ldef$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 41.gate2.yokota.attnet.or.jp
X-Newsreader: Forte Free Agent 1.0.82

As I sit here reading your post I glanced down at what was one a Icom
BP-84 pack I tried to take apart.  I tried to pry the bottom off and
managed to do so with only <minor> damage.  It is glued all around by
an unknown type of adhesive.  Inside you'll find the batteries
themselves easy to remove.  The bottom was permanently deformed by the
process and wouldn't look right.  If I find a similiar sized piece of
black plastic to glue back in its place I might try to put it back
together again.  I decided to get one of the cheap replacement packs
sold in the back of Ham Magazines.  If I had it to do again I would
get a NIMH  replacement with twice the capacity or the same capacity
and half the size of the humongus BP-84 - and might try heating the
bottom of the pack to try and loosen the adhesive.

Cheers,




[e-mail] (Aris Kaponides) wrote:

>Can someone give some idea as to what is the best way to open the icom
>batt pack BP84 so that i can replace the cells?
>Thanks in advance
>de Aris-5B4JE




From [e-mail] Wed Oct 30 06:36:34 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!aanews.merit.net!monroe.lib.mi.us!news
From: Dan Metzger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Operating Contest for HomeBrew?
Date: Wed, 23 Oct 1996 22:29:56 +0000
Organization: Monroe County Library
Lines: 5
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pm159-00.dialip.mich.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Macintosh; I; 68K)

I've been QRT for 27 years, so please forgive me if this is a dumb
question.  Is there an operating contest for home-brewers?  I'm
building a HB transceiver, and have dreams of calling CQ HB and
landing at the bottom of a pileup, just like rare dx.   - Dan, K8JWR
 (e-mail reply appreciated - work often makes me miss postings)


From [e-mail] Wed Oct 30 06:36:35 1996
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From: Lennart Nilsson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Operating Contest for HomeBrew?
Date: Fri, 25 Oct 1996 12:38:57 +0200
Organization: Foreningen Lejonet, Linkoping, Sweden
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Dan Metzger wrote:
>
> I've been QRT for 27 years, so please forgive me if this is a dumb
> question.  Is there an operating contest for home-brewers?  I'm
> building a HB transceiver, and have dreams of calling CQ HB and
> landing at the bottom of a pileup, just like rare dx.   - Dan, K8JWR

Aren't there enough contests already? Besides, you would get a lot of
replies from Switzerland. HI. But I support the idea of a meeting place,
a worldwide recognized frequeny on each band for homebrewers with their
equipment (all HB of course, kits won't count) on the air.
73 de Lennart SM5DFF


From [e-mail] Wed Oct 30 06:36:36 1996
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From: [e-mail] (Lawrence Stoskopf)
Newsgroups: rec.radio.amateur.homebrew
Subject: Parabola program
Date: 27 Oct 96 03:49:57 GMT
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> Date: Sat, 26 Oct 1996 10:57:57 +0200
> From: sebastien <[e-mail]>
> Subject: Want parabola calculate program
>
> Hello, thanks to read my. I'm HB9ICC in Geneva.
>
> I'm looking for a program to calculate a parabola antenna.

The parabola program part is easy. What isn't obvious is that if you use
simple analytical calculus, you can rotate the axis of the parabola from
the usual plot, make the origin of the graph at 0,0 for the center of
the paraabola and x,0 for the edge of the dish...you will find that for
F/D ratios used in ham antennas, you can plot the whole thing on
standard 8 1/2 inch width paper.  No more laying the thing out by hand.

I wrote this up for the Central States VHF Society some 10 years ago.
The whole program was about 10 lines of some version of Forth but I
haven't got a clue where it's filed away.  The  math is not hard.

It is a simple and interesting exercise.  Hope this helps.

N0UU


From [e-mail] Wed Oct 30 06:36:36 1996
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From: Andy Cook <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: 21 Oct 1996 12:52:59 GMT
Organization: BT
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Interesting discussion about getters and the 3-500Z and so on. I know of
one TL922 amp with a pair of 3-500Zs in which was left turned on for about
a 6 month stretch but without being significantly used as an RF amp. The
amp will now only do about 500W out and, as no expert and on anecdotal
evidence, I put this down to some form of poisioning of the heaters. Is
this a non-reversable process that a few hours of giving the amp a good
caning won't cure, and do people have any comments on the merits of
running the heaters at overvoltage for a short time to burn the rubbish
off the surface?

Andy Cook, G4PIQ.
[e-mail]



From [e-mail] Wed Oct 30 06:36:38 1996
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From: Ramon Gandia <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: Tue, 22 Oct 1996 04:38:26 -0800
Organization: Anvil Technology
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To: "J. Fred Riley" <[e-mail]>

J. Fred Riley wrote:
>
> Same thing--insofar as the modulation of the anode is concerned.  PWM
> rigs are high-level plate modulated.  The modulated stage doesn't know
> the difference.

I recall these Continental rigs.  The r.f. tube and the modulator
tube were in Series for DC, and the voltage would split between
them.  The modulator, or switch, would vary the voltage on
the tubes, at peak the full supply voltage would appear across
the r.f. tube, at a valley, the r.f. tube was basically zero.

Also, as I recall, the thing was not very linear (not enough to
pass the proof-of-performance FCC test, so Continental sampled
the r.f., fed it back (negatively) to a correction amplifier or
speech amplifier to distort the modulation in such a way that the
resulting distortion was cancelled and a clean output would
result.

This same thing was also with the old Doherty transmitters with
quadrature-fed (r.f) tubes that were grid modulated and also
acchieved high efficiency without transformers and modulation
chokes.  Westinghouse liked these, if I recall correctly.
--
In order to foil SpamBots, my e-mail address is not
machine readable.  Please reply to address below:

Ramon Gandia,    Nome, Alaska  |    rfg.at.nome.dot.net
AL7X          S/V Seven Stars  |
907-443-2437 fax [phone]  | where at=@  dot=period


From [e-mail] Wed Oct 30 06:36:39 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: Tue, 22 Oct 1996 09:57:20 -0500 (CDT)
Organization: INTERNET AMERICA
Lines: 45
Message-ID: <54inci$[e-mail]>
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You remember the theory well.  But the series arrangement actually has
three variants, one called classic, one called PWM, and one called
PWM; Harris used PDM, Collins/Continental used PWM.

> the thing was not very linear (not enough to pass the proof-of-performance F
CC test, so Continental sampled
>the r.f., fed it back (negatively) to a correction amplifier

That's entirely incorrect.  Either one of the three systems is very
linear.  Harris did sample the RF and feed it back into the power
control and audio circuits.  Collins/Continental never did use RF
feedback on any PWM rig--and there's lots of reasons why.
Collins/Continental did use an advanced feed-forward error correction
circuit that sampled, among other things, the total supply voltage.
The input audio/DC-Reference signal was corrected for
non-linearities in a four-quadrant Hilbert Multiplier stage.

>This same thing was also with the old Doherty transmitters with
>quadrature-fed (r.f) tubes that were grid modulated and also
>acchieved high efficiency without transformers and modulation
>chokes.  Westinghouse liked these, if I recall correctly.

No.  Western Electric was the big Doherty amplifier manufacturer
before Continental Electronics came along; Westinghouse developed
their own high-level plate modulated transmitter called the 50-HG.
The grids of the Doherty were not modulated by CEC; that was Western
Electric.  We always used a screen modulated driver.  Mr. Weldon, the
founder of Continental Electronics, found a new way to drive the
carrier tube (grounded-grid) that stabilized the input impedance and
lowered the feedback requirement from 30db to 10 db.

I should add that feedback was used in almost all transmitters (except
the Collins/Continental) to control the hum from the PA filament.  For
instance, on the 50 KW AM that Harris made, the noise was about -52 db
and 99% of that was attributable to the PA and Driver filaments.  They
used RF feedback to control that hum.  A side benefit (for them) was
also to use the RF feedback to control a power drift problem that the
early PDM rigs had.


FRED

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



From [e-mail] Wed Oct 30 06:36:40 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: 23 Oct 1996 11:43:13 -0400
Organization: America Online, Inc. (1-800-827-6364)
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In article <54jmto$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>
>You're absolutely correct, Tom. Reid was kind enough to get the
>drawings out and check for me.  He says, " The 3-500Z uses only a
>[zirconium] coating on the anode for gettering in the 3-500Z.   This
>works to some degree at anode temperatures as low as 300 degrees C,
>but better of course when the anode is red hot. There is no tab or
>other getter in the tube.

And hence my point about some of the wild claims about parasitics and
such.

There are two primary causes of arcing in the 3-500Z (assuming it was good
at one time). You either have let the thing sit dead cold long enough for
it to gas up, or you've never run the thing red enough to properly getter
the tube.

The worse thing in the world for tubes like the 4-125, 3-400, 4-400,
3-500Z, 3-1000Z, 4-1000A, and others is to NEVER run them with some anode
color.

When you turn em on, it won't be a little space Martian causing an
avalanche of current, it'll be gas. The only way to de-gass em is to get
the anode hot, and you can't do that without making em arc unless you pull
the grids up positive and lower the HV.

73 Tom


From [e-mail] Wed Oct 30 06:36:41 1996
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From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: Tue, 22 Oct 1996 23:55:36 GMT
Organization: INTERNET AMERICA
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[e-mail] (W8JI  Tom) wrote:

>The getter...in the metal anode 3-500Z. It's coated on the anode, and is only
>fully activated with some anode color.

You're absolutely correct, Tom. Reid was kind enough to get the
drawings out and check for me.  He says, " The 3-500Z uses only a
[zirconium] coating on the anode for gettering in the 3-500Z.   This
works to some degree at anode temperatures as low as 300 degrees C,
but better of course when the anode is red hot. There is no tab or
other getter in the tube."

I doubt that the filament is getting the anode hot enough to be
effective but I do not know that for sure.  If it isn't doing a good
job--as implied--then idling the filaments with no anode color would
certainly be inappropriate.



Fred

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



From [e-mail] Wed Oct 30 06:36:42 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Plate Modulation with the 3-500Z
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <544asb$[e-mail]> <545a3s$[e-mail]> <546me6$[e-mail]> <[e-mail]> <[e-mail]>
Date: Thu, 24 Oct 1996 17:08:40 GMT
Lines: 37

In article <[e-mail]> [e-mail] writes:
>In <[e-mail]> [e-mail] (Gary Coffma
n) writes:
>
>>There *is* another way, and that's to maintain backward
>>compatiblity. We did that when we went from B&W to color
>>television with NTSC. That was an awful kludge, and saddled
>>us with bad video for nearly 4 decades. We could have gone
>>PAL instead, but that would have obsoleted our product's
>>installed base of B&W receivers.
>
>What do you mean here?  Going from NTSC to PAL or directly from B&W to PAL?
>
>Europe has (mostly) gone directly from B&W to PAL and it DOES have
>backward compatability.  I have watched colour transmissions on a B&W
>TV for years.
>In fact, there is little difference between an NTSC and PAL signal: the
>alternating phase of the colour carrier between successive lines.

Ah, there's the little matter of different sweep rates. But you're
right, we could have gone directly from B&W to PAL-M, which does
use the standard (to the US) sweep rates. Of course NTSC pre-dates
PAL and SECAM, so those weren't really options at the time. The
choices were NTSC or the CBS sequential color system (it wasn't
compatible either, but made much better pictures).

As a chuckle, here are some definitions for the acronyms.

NTSC    Never Twice the Same Color
SECAM   System Essentially Contrary to the American Mind
PAL     Perfection At Last

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] Wed Oct 30 06:36:43 1996
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From: [e-mail] (R.L. Measures)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Modulation with the 3-500Z
Date: Tue, 29 Oct 1996 06:51:00 -0700
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In article <54leeh$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:
snip

> And hence my point about some of the wild claims about parasitics and
> such.

Sound interesting? ......see the Good source for amplifier tips  thread.

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Wed Oct 30 06:36:44 1996
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From: Bob Miller <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.ham-radio
Subject: Re: Please help find Manual- Allied A2516 Ham receiver
Date: Wed, 23 Oct 1996 20:57:41 -0700
Organization: CalWeb Internet Services, Inc.
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Xref: news1.epix.net rec.antiques.radio+phono:30601 rec.radio.amateur.homebrew:20446 rec.radio.amateur.equipment:41149 rec.radio.amateur.misc:116941

Jim Larson wrote:
>Hi Jim

        Try W7FG Vintage Manuals
        800 807 6146
        3300 Wayside Drive
        Bartlesville, OK 74006


> Please help me find a source for a manual/schematics for an old Allied
> model A2516 ham receiver. It is an older tube type, a kit I think.
> I have tried Sam's and Sarrio with no luck. Does anyone know some good
> sources for manuals or possibly an individual that would have a xerox
> copy available? Please forgive me if this is in an FAQ somewhere,
> I am a newbie, and this is my first "taste of ham" :)
>
> p.s. I'm hooked..........
>
> Thank you ALOT!
>
>
>            ._________________
>           /________________/|   _____
>          |                | |  /___/|
>          |______.   ._____j/  |   | |
>                 |   | |       |___|/
>         _____   |   | |        ______      _____    _____
>        /___/|   |   | |       /____/|     /____/\  /___/|
>       |   | |   |   | |       |   | |     |    \ \/   | |
>       |   |  \__|   | |       |   | |     |     \/    | |
>       \    \___/    / /       |   | |     |   \    /  | |
>         \          / /        |   | |     |   | \/ |  | |
>           \_____./_/          |___|/'     |___|/'  |__|/'
>
>   James K. Larson - [e-mail] - Junction City, Oregon


From [e-mail] Wed Oct 30 06:36:46 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Problems making PCBs
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Tue, 29 Oct 1996 21:22:45 GMT
Lines: 30

In article <[e-mail]> [e-mail] (Lars Moell) w
rites:
>Have anyone found a transparent plastic sheet that can easily be
>obtanined and be used in either a laser printer and/or a copier to
>give fair results?
>
>73 Lasse SM5GLC

I use the Avery brand laser transparencies. These are different
from the transparencies sold for copiers and seem to work better.
I'm told copiers are hotter, and require a different transparency
material. If you use copier transparencies in a laser printer,
you don't get as good a fusion of toner to the transparency.

I friend of mine just showed me a transparency he did on an Epson
Stylus inkjet printer. Looked really good. This may be a better
way to go. Note, inkjets need a special transparency material
or the ink will smear like crazy. The side the ink goes on has
a slightly rough feel.

I hope this doesn't need to be said, but of course you need to
print the transparency with a mirror image of the layout and
expose with the ink side toward the board. Otherwise you'll
get undercutting of the resist.

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] Wed Oct 30 06:36:47 1996
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From: [e-mail] (Lars Moell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Problems making PCBs
Date: Tue, 29 Oct 1996 17:39:26 GMT
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Hi
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
3 Exspose a P20 PCB
4 Develope the P20
5 Etch

The problem seems to be in the plastic film that is not enough
transparent, and the black areas not enough black giving poor contrast
and the areas that I want to be removed often have some P20 left on
the copper despite the time I try to develope the traces.

Have anyone found a transparent plastic sheet that can easily be
obtanined and be used in either a laser printer and/or a copier to
give fair results?

73 Lasse SM5GLC


From [e-mail] Wed Oct 30 06:36:48 1996
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From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP homebrew list
Date: 21 Oct 1996 18:04:16 GMT
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In article <[e-mail]>, [e-mail] says...
>
>Hi everybody,
>
>I have been on the QRP-L for a long time, and have seen
>the list change considerably since it started.
>
>        Because it is becomming a list more of people building
>kits and Chasing foxes, I proposed that a new QRP-HB homebrew list be crea
>ted.
>
>        Many people e-mailed me directly, and said, good idea..Many
>posting to the list directly said, No Way.
>
>        Now, my question is is there enough interest out out there to support
>a QRP-HB (Homebrew) list or not?
>
>        By some people on the list, I was told to come here and post
>(rec.radio.amateur.homebrew).
>
>        With the current thread that is going on here, it seems that
>Homebrewing in general is at risk.
>
>        What do you all think?
>
>        73
>                Brad Mitchell
>                WB8YGG

I'd like to see a newsgroup for QRPers.  I mentioned this to a couple
of friends who are QRP-L members.  They both said this idea has been
brought up many times, and each time, it was shot down in flames.  I
can't see why, but that's what happened.

73 / 72 from D/FW
--
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] Wed Oct 30 06:36:50 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!news
From: "Robert L. Morgenstern" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP homebrew list
Date: Wed, 23 Oct 1996 09:59:16 -0400
Organization: Erol's Internet Services
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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CC: [e-mail]

Stephen Wandling wrote:
>
> Brad:
>
> Your posting has had me waxing philosophical.  Stuff like humans need to
> communicate, and then when given the method or opportunity, have nothing
> to say.
>
> As an old CW op (1952) I recall many 'identical' ?conversations?:
>
> XMTR IS . . .
> RCVR IS . . .
> RST IS . . .
> GOTTA GO
>
> I guess my point is that I found it so exciting to fire up that 6L6,
> press the key and hear my call letters coming back.  Beyond that it was
> just QRP, DX or as you say Fox hunts.  The medium was the message.
>
> 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?Hi Stephen;
>is there more than that<  Yup; How about solar driven QRP on the beachwith th
e Atlantic Ocean as your gnd, a home brew 20m vert. and a plain
ol' straight key.Been there; done that; its a rush, let me tell you it
still is a rush. Guy in G3 land sez" rpt your power source and wattage"
The XYL refuses to be near me at a time like that..embarrased ! A grown
man (65) behaving like a kid. We all get older( hopefully ) but the
trick to staying young is not to grow up. Enough philosophy.
73's /72's
Bob..WA2EAW


From [e-mail] Wed Oct 30 06:36:51 1996
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From: Walter Rawle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: quadrature modulator/demodulator
Date: Tue, 22 Oct 1996 10:08:03 -0700
Organization: Ericsson Data Services Americas
Lines: 14
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Quadrature modulation, in simple terms, simply refers to the separation
of the baseband signal into two components, like the Fourier transform
sine and cosine series; mixing these two components up the RF frequency
independently, and then re-combining them in a linear combiner (a simple
summing circuit).  The two baseband components are referred to as the I,
for in-phase, and q, for quadrature phase, components. The LO signals
that up-convert the baseband components to RF are equal in frequency but
phase shifted 90 degrees. These circuits can theoretically be used for
all modulation/demodulation techniques, but are very popular for various
data communications such as pi/4 DQPSK. For AM and SSB, undergraduate
communications textbooks will refer to synchronous detection. This is
essentially a quadrature demodulator in disguise. Hope this helps

walter rawle VE1AWS/W4


From [e-mail] Wed Oct 30 06:36:53 1996
Newsgroups: rec.radio.amateur.homebrew,sci.electronics,sci.electronics.design,sci.electronics.basics
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Quadrature modulator/demodulator
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54h4j9$[e-mail]>
Date: Thu, 24 Oct 1996 16:18:05 GMT
Lines: 61
Xref: news1.epix.net rec.radio.amateur.homebrew:20438 sci.electronics.design:23735 sci.electronics.basics:15080

In article <54h4j9$[e-mail]> [e-mail] (Maroof H.
 Choudhury) writes:
>Can anyone tell what a 'quadrature modulator' is? Is it used only for FM or
>can it be used for AM and SSB detection too?
>Has anybody used the Maxim MAX2450 quadrature modulator/demodulator?
>Thanks for the help.
>
>Maroof

Ok, quadrature means a 90 degree phase shift, IE signals which are
orthogonal to each other. These signals are called I and Q where
I in the in-phase signal and Q is the quadrature-phased, or 90 degree
shifted, signal.

Now there are various usages of quadrature in modulation and
demodulation.

The FM quadrature detector is a special form of frequency
discriminator. It splits the received signal into two components.
The I signal is fed directly to one input of an exclusive OR gate
(also known as a phase detector). The Q signal is first delayed
90 degrees by a LCR circuit and then fed to the other input of
the XOR gate. The LCR circuit will only yield a 90 degree delay
at the carrier frequency. At a higher or lower frequency, it will
deliver a greater or lesser delay.

When receiving an unmodulated carrier, the lowpass filtered output
of the XOR gate will be a DC level midway between the + and - supply
voltages. If the signal is modulated, as the frequency swings higher,
the filtered output of the XOR swings lower, and when the frequency
swings lower, the filtered output of the XOR swings higher in proportion
to the frequency change. That's because the signals slide in time with
respect to each other according to the departure from quadrature of the
LCR circuit at the instantaneous frequency. This recovers the audio
modulation impressed on the FM carrier at the transmitter.

A different usage of quadrature allows generation or demodulation
of amplitude modulated signals such as SSB. In this case, two
quadrature delays are used, one at carrier frequency and the other
at modulation frequency. Through use of a pair of balanced mixers
and a combiner, SSB of either LSB or USB can be generated or detected.

Generically, the amplitude response of a quadrature system is

  y = |sqrt(I^2 + Q^2)|

The phase response of a quadrature system is

  phi = arctan(Q/I)

By combining the amplitude and phase relations with suitable
circuitry, IE multipliers, summers, etc, any arbitrary signal
form can be generated or detected since any signal modulation
can be described in terms of its instantaneous amplitude and
phase.

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] Wed Oct 30 06:36:53 1996
Newsgroups: rec.radio.amateur.homebrew,sci.electronics,sci.electronics.basics,sci.electronics.design
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: quadrature modulator/demodulator
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <54mr99$[e-mail]>
Date: Thu, 24 Oct 1996 17:36:41 GMT
Lines: 15
Xref: news1.epix.net rec.radio.amateur.homebrew:20461 sci.electronics.basics:15103 sci.electronics.design:23798

In article <54mr99$[e-mail]> [e-mail] (Maroof H.
 Choudhury) writes:
>
>Is quadrature modulation a modification to the 'phasing mathod' or 'Weaver
>method' of SSB generation or is it actually the same thing?

Quadrature modulation *is* the phasing method, or more precisely, the
phasing method is one subset form of generic quadrature modulation.
The Weaver method is something a bit different.

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] Wed Oct 30 06:36:54 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!vixen.cso.uiuc.edu!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Tobbe Frode)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ray Jefferson trcvr
Date: 29 Oct 96 14:13:31 GMT
Organization: ucsd usenet gateway
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Looking for diagrams, schema for a VHF station
Ray Jeffersson 7878M. Probably a marine station.
Delivered with a yacht imported from US.
73 de SM5NPV/Tobbe



From [e-mail] Wed Oct 30 06:36:56 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!news.3do.com!cypher.3do.com!user
From: [e-mail] (Tom Watson)
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Recieving tubes for transmitting?
Date: Fri, 25 Oct 1996 18:05:38 -0700
Organization: The 3DO Corporation
Lines: 30
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: cypher.3do.com
Xref: news1.epix.net rec.radio.amateur.boatanchors:224 rec.radio.amateur.homebrew:20471

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

> Which recieving tubes can be used for transmitting also?
> I've done it with a 6L6WGB, a 1U4 & a 3A5.
> Which tubes make good RF amplifiers? I'm not expecting a lot of power
> maybe 50 watts max. I've heard some sweep tubes can do up to maybe
> 200W in CW or SSB service.  I remember seeing a magazine article using
> a pair of 50C5's. Also heard of using 45 tubes but not sure what they
> would put out.

It all depends upon the upper frequency limit of the tube (inter element
distances, etc...)

Sweep tubes have an upper range higher than audio tubes because of the
need to handle the sharp waveform of the horizontal sweep.  IIRC the Drake
TR-4 (I'll look in my garage) uses sweep tubes and is good up to 30 MHz.

I suspect that audio tubes (6L6 and friends) peter out at a bit lower
frequency.  On the other hand, RF tubes make VERY good audio tubes.  I
know of one person who used 807's in an audio setup for his "high quality"
amplifier.  Later (this was about 20 years ago) he went down to Radio
Shack and got one of their "off the shelf" receivers and it was better (or
equal to) his older setup.  It also dissapated MUCH less power.

As always, YMMV.

--
Tom Watson
[e-mail]         (Home: [e-mail])


From [e-mail] Wed Oct 30 06:36:57 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!howland.erols.net!newsfeed.internetmci.com!aanews.merit.net!monroe.lib.mi.us!news
From: Dan Metzger <[e-mail]>
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Recieving tubes for transmitting?
Date: Fri, 25 Oct 1996 19:15:54 +0000
Organization: Monroe County Library
Lines: 6
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References: <[e-mail]>
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The Heath DX-20 (my first rig) used a single 6DQ6 TV sweep tube at 50
Watts (500 V x 100 mA).  Other rigs have used two or more in parallel.
I tried using a 50C5 as an rf output tube once, and could't get the
darned thing to load, although I had used many other audio output
tubes in a similar fashion.
 -Dan, K8JWR


From [e-mail] Wed Oct 30 06:36:58 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Recieving tubes for transmitting?
Date: Sat, 26 Oct 96 18:41:57 GMT
Organization: Baka Engineering Service
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
 <[e-mail]>
NNTP-Posting-Host: treasure-d23.syix.com
X-Newsreader: Quarterdeck Message Center [2.00]
Xref: news1.epix.net rec.radio.amateur.boatanchors:254 rec.radio.amateur.homebrew:20524

I suspect that audio tubes (6L6 and friends) peter out at a bit lower
> frequency.  On the other hand, RF tubes make VERY good audio tubes.  I
> know of one person who used 807's in an audio setup for his "high quality"
> amplifier.  Later (this was about 20 years ago) he went down to Radio
> Shack and got one of their "off the shelf" receivers and it was better (or
> equal to) his older setup.  It also dissapated MUCH less power.
>
> As always, YMMV.
>
> --
> Tom Watson
> [e-mail]         (Home: [e-mail])

Well guys, I have to jump in here with my limited knowledge and 2 cents worth.

It seems like the beam power pentodes were good up to a pretty high frequency
and you would be better off with a large octal just because of plate power
dissipation. Sure you could use a 12AT7 dual triode, but why, the little ones
have the frequency response but no plate power. I think in general the idea is

that the more grids you have the higher the frequency response. Triodes are
usually low frequency with only one grid, Heptodes(?) with 2 grids a little
more, and Pentodes are the king with 3 grids, 1 for control, 1 for electron
bounce suppression, and 1 for capacitance neutralization.

 I don't have my tube manuals handy or I could look this up. If you want I can

at a later date look up what would be a good all around tube. I have RCA
manuals from 1956, 1965, and 1976 (mostly those stupid compactrons), and an ol
d
Sylvania book about 1965.

Let me know if I can help.

Bill Baka, vacuum state FET enthusiast. Tube = N channel depletion mode FET.




From [e-mail] Wed Oct 30 06:36:59 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!howland.erols.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!munnari.OZ.AU!news.uwa.edu.au!yarrow.wt.com.au!usenet
From: [e-mail] (Uncle)
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Recieving tubes for transmitting?
Date: Tue, 29 Oct 1996 23:50:43 GMT
Organization: Winthrop Technology
Lines: 51
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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Xref: news1.epix.net rec.radio.amateur.boatanchors:295 rec.radio.amateur.homebrew:20589

On Fri, 25 Oct 1996 18:05:38 -0700, [e-mail] (Tom Watson) wrote:

+In article <[e-mail]>,
[e-mail] wrote:
+
+> Which recieving tubes can be used for transmitting also?
+> I've done it with a 6L6WGB, a 1U4 & a 3A5.
+> Which tubes make good RF amplifiers? I'm not expecting a lot of
power
+> maybe 50 watts max. I've heard some sweep tubes can do up to maybe
+> 200W in CW or SSB service.  I remember seeing a magazine article
using
+> a pair of 50C5's. Also heard of using 45 tubes but not sure what
they
+> would put out.
+
+It all depends upon the upper frequency limit of the tube (inter
element
+distances, etc...)
+
+Sweep tubes have an upper range higher than audio tubes because of
the
+need to handle the sharp waveform of the horizontal sweep.  IIRC the
Drake
+TR-4 (I'll look in my garage) uses sweep tubes and is good up to 30
MHz.
+
+I suspect that audio tubes (6L6 and friends) peter out at a bit lower
+frequency.  On the other hand, RF tubes make VERY good audio tubes.
I
+know of one person who used 807's in an audio setup for his "high
quality"
+amplifier.  Later (this was about 20 years ago) he went down to Radio
+Shack and got one of their "off the shelf" receivers and it was
better (or
+equal to) his older setup.  It also dissapated MUCH less power.
+
+As always, YMMV.
+
+--
+Tom Watson
[e-mail]         (Home: [e-mail])


Zachhary right!  I STILL use a Drake transverter on
six meters, 3 X 6KD6, 300w PEP at 50Mc!

Uncle Brian  VK6BQN

    -    -    -    -
Life isn't meaningless, it just has a poor signal to noise ratio.


From [e-mail] Wed Oct 30 06:37:00 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!raphael.davinci.com!news.sprintlink.net!news-pen-4.sprintlink.net!news.azstarnet.com!news
From: "Jon Ralls" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Removing an Antenna
Date: 30 Oct 1996 04:24:29 GMT
Organization: Desert Haven Church of Christ
Lines: 7
Message-ID: <01bbc622$542020c0$[e-mail]>
NNTP-Posting-Host: usr10ip8.azstarnet.com
X-Newsreader: Microsoft Internet News 4.70.1155

I mounted a 2 meter ant. to my window on a van and I would like to move it.
The problem is that it is stuck to the window with the adhesive that came
on it. The antenna was made by Radio Shack and the guys there don't have a
clue if it can be removed without damaging the antenna. Anybody got any
ideas? Thanks.
Jon Ralls
KB0FKI


From [e-mail] Wed Oct 30 06:37:01 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!arclight.uoregon.edu!super.zippo.com!zdc!szdc!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: SB-220 Parts
Date: Mon, 21 Oct 1996 14:25:41 GMT
Organization: Zippo
Lines: 7
Message-ID: <54g0qs$[e-mail]>
X-Newsreader: Forte Free Agent 1.0.82

Does anyone now who has parts for the SB-220 Heathkit Amp. Needed are
the filter caps and the multimeter. E-Mail direct thanks.

Mac   KD7IY

[e-mail]



From [e-mail] Wed Oct 30 06:37:02 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!cs.utexas.edu!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newsstand.cit.cornell.edu!news.consultix.com!newshost.cyberramp.net!usenet
From: [e-mail] (Tony White)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics for Car Radio AM to SW
Date: 23 Oct 1996 02:50:52 GMT
Organization: Digitrix Microsystems
Lines: 10
Message-ID: <54k16c$[e-mail]>
References: <54jkbg$[e-mail]>
NNTP-Posting-Host: dal-tsa5-23.cyberramp.net
X-Newsreader: WinVN 0.99.7

In article <54jkbg$[e-mail]>, [e-mail] says...
>
>
>Does anyone have or know of schematics for a converter to listen to
>SW on a cars AM radio.

MFJ makes a kit for one, I think.

I might have a schematic on one, too.  Let me dig through the archives.



From [e-mail] Wed Oct 30 06:37:02 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!super.zippo.com!zdc!zippo!drn
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematics for Car Radio AM to SW
Date: 22 Oct 1996 16:11:44 -0700
Organization: Zippo
Lines: 6
Message-ID: <54jkbg$[e-mail]>
NNTP-Posting-Host: interlock.randomhouse.com


Does anyone have or know of schematics for a converter to listen to
SW on a cars AM radio.

thanks
        Mike W KC5BOD


From [e-mail] Wed Oct 30 06:37:03 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!myth.vianet.on.ca!newsfeed.vivanet.com!imci5!pull-feed.internetmci.com!newsfeed.internetmci.com!lily.redrose.net!john
From: [e-mail] (me)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.antenna
Subject: Seeking Ham radio info (antennas)
Date: 26 Oct 1996 13:43:56 GMT
Organization: Your Organization
Lines: 31
Message-ID: <54t4is$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.equipment:41216 rec.radio.amateur.homebrew:20498 rec.radio.amateur.misc:117029 rec.radio.amateur.antenna:30474

        I'm looking for some information on some ideas for a 2 meter
antenna. My call is N3XZX.  I basically recieved a homebrewed antenna from a
gentleman in Atlantic City.  I liked the idea and tend to build a few
myself.  It's just a plain old ground plain antenna,  The one i recieved was
a quarter wave and i was wondering if there was any ideas and info for
making the same type but creating a 5/8 wave.
        I heard for a 5/8 you need to have a top hat, is this true? Also any
info on whether this 5/8 is a good antenna comparing it to the quarter wave.
 Any info would be greatly appreciated!
                                Thanks,
                                    N3XZX
                                        (Chris)
















Please carbon copy responses to [e-mail] so I don't miss
any good info



From [e-mail] Wed Oct 30 06:37:05 1996
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From: [e-mail] (Paul W Schleck KD3FU)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.antenna
Subject: Re: Seeking Ham radio info (antennas)
Date: 26 Oct 1996 13:39:55 -0000
Organization: Novia Internetworking <> 33.6kbps dialup; 402/390-2NET
Lines: 31
Message-ID: <54tltr$[e-mail]>
References: <54t4is$[e-mail]>
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In <54t4is$[e-mail]> [e-mail] (me) writes:

>       I'm looking for some information on some ideas for a 2 meter
>antenna. My call is N3XZX.  I basically recieved a homebrewed antenna from a
>gentleman in Atlantic City.  I liked the idea and tend to build a few
>myself.  It's just a plain old ground plain antenna,  The one i recieved was
>a quarter wave and i was wondering if there was any ideas and info for
>making the same type but creating a 5/8 wave.
>       I heard for a 5/8 you need to have a top hat, is this true? Also any
>info on whether this 5/8 is a good antenna comparing it to the quarter wave.
> Any info would be greatly appreciated!
>                               Thanks,
>                                   N3XZX
>                                       (Chris)

In addition to the excellent replies and suggestions that I'm sure
you'll get on this newsgroup, you may also wish to consult my Amateur
Radio Elmers Resource Directory:

http://www.novia.net/~pschleck/elmers/

There are a number of good antenna "Elmers" listed, accessible directly
from:

http://www.novia.net/~pschleck/elmers/antennas.html

--
73, Paul W. Schleck, KD3FU
[e-mail]
http://www.novia.net/~pschleck/
Finger [e-mail] for PGP Public Key


From [e-mail] Wed Oct 30 06:37:06 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!netnews.worldnet.att.net!newsadm
From: altavoz <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.antenna
Subject: Re: Seeking Ham radio info (antennas)
Date: Sat, 26 Oct 1996 21:52:17 -0700
Organization: worldnet.att.net
Lines: 40
Message-ID: <[e-mail]>
References: <54t4is$[e-mail]>
NNTP-Posting-Host: 207.san-francisco-003.ca.dial-access.att.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02E (Win16; I)
To: me <[e-mail]>
Xref: news1.epix.net rec.radio.amateur.equipment:41274 rec.radio.amateur.homebrew:20523 rec.radio.amateur.misc:117068 rec.radio.amateur.antenna:30528

me wrote:
>
>         I'm looking for some information on some ideas for a 2 meter
> antenna. My call is N3XZX.  I basically recieved a homebrewed antenna from a
> gentleman in Atlantic City.  I liked the idea and tend to build a few
> myself.  It's just a plain old ground plain antenna,  The one i recieved was
> a quarter wave and i was wondering if there was any ideas and info for
> making the same type but creating a 5/8 wave.
>         I heard for a 5/8 you need to have a top hat, is this true? Also any
> info on whether this 5/8 is a good antenna comparing it to the quarter waveN
3XZX Chris

altavoz: No hat required for 5/8 w. A 5/8w is much better for vert'
omni directional than 1/4w . Same coil for 1/4w but tapped a little
different . Radials must be 180 degrees, straight down, with
"wiskers" ( going down 1/4w from feed point, some 1/4w radials at
45 degree angle...they form a cone ).
  A hat on 5/8 w will effect the pattern , try it.
For more gain, put a hairpin ( <1/4w shorted stub) on top of 5/8 then
another 5/8w vert on top of that . Or the whole ant' a 5/4w and a
colinear stub pointing down ( open end down , at the 5/8 w point)
Coax up thru "tube" Radial system.
          |
          |
          |_
          | |
          | |
          | |
          |
          |
          |
          |
          |
          |
          feed
          |
          |
          |
        / | \
       /  |  \
      /   |   \


From [e-mail] Wed Oct 30 06:37:08 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!EU.net!chsun!news.eunet.ch!ascomax.hasler.ascom.ch!usenet
From: Robert Ganter 3039 <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Smart Gel Cell battery charger
Date: Mon, 21 Oct 1996 14:07:27 +0200
Organization: Ascom Business Systems AG
Lines: 27
Message-ID: <[e-mail]>
References: <54127c$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pcts72.ens.ascom.ch
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)

Daniel Lavoie wrote:
>
> I have a lot of gell cell battery packs that were taken off UPS'.  Do you
> know where I can find a good article on gell battery charging.  I would
> even consider buying the charger from a commercial retailler if you know a
> good make.
>
> My requirements are to be able to rechage a battery pack with a combined
> power rating of  200 watts/hour.
>
> Thanks
>
> Daniel
> VE3DCL

IN one of the last (the 1993 issue, I think) ARRL handbooks, there is a
charger for Gel cell batteries. It uses standard components troughout
and should be easy to adapt for Your Ah-ratings.

Another approach is to use a special IC from Unitrode (the UC3906, not
shure about the number). They have a webpage with complete datasheets.

Very easy to use IC, but quite expensive.

73

Robert HB9NBY


From [e-mail] Wed Oct 30 06:37:09 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!newsfeed.internetmci.com!in2.uu.net!news.consultix.com!newsstand.cit.cornell.edu!news.acsu.buffalo.edu!acsu.buffalo.edu!tumino
From: [e-mail] (Thomas N Tumino)
Newsgroups: rec.radio.amateur.homebrew
Subject: Soldering small connections
Date: 26 Oct 1996 08:16:40 GMT
Organization: University at Buffalo
Lines: 13
Message-ID: <54shd8$[e-mail]>
NNTP-Posting-Host: lictor.acsu.buffalo.edu
NNTP-Posting-User: tumino
X-Newsreader: TIN [version 1.2 PL2]

Could someone be kind enough to tell me where I can buy a soldering iron
with a small tip (suitable for soldering pins that are extremely close
together on connectors) or tell me how I can solder wires to pins that are
extremely close together but must not short?

I have destroyed several connectors trying to solder small wires to the
pins on these connectors...these connectors are driving me to insanity!
Please e-mail or post any suggestions you have asap before I tear out all
of my hair and run out of connectors..

Thanks!

Thomas N2YTF


From [e-mail] Wed Oct 30 06:37:10 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!feed1.news.erols.com!uunet!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (G4YNM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Soldering small connections
Date: 26 Oct 1996 12:36:26 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 19
Sender: [e-mail]
Message-ID: <54tema$[e-mail]>
References: <54shd8$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <54shd8$[e-mail]>,
[e-mail] (Thomas N Tumino) writes:

> how I can solder wires to pins that are
>extremely close together but must not short?

1. Carefully lay non plastic tape (say masking tape) over adjacent pins
before sodlering the middle one.

2. Remove tape.

3. repeat one for the next pin to be soldered.

or
Alternatively apply solder to the PCB pins first,  place device over pins,
melt solder with a hot air gun.

Ben G4YNM



From [e-mail] Wed Oct 30 06:37:11 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.callamer.com!spork.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Soldering small connections
Date: Sat, 26 Oct 1996 17:15:15 -0700
Organization: Call America Internet Services  [phone]
Lines: 27
Message-ID: <[e-mail]>
References: <54shd8$[e-mail]>
NNTP-Posting-Host: spork.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]
To: Thomas N Tumino <[e-mail]>
In-Reply-To: <54shd8$[e-mail]>

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.  A chisel
tip can be formed by simply your cutters and clipping off the end
of the extended wire.  Normally you need less heat for small connectors,
so the heat loss in the wire wrap is not an issue.  Cliff Buttschardt K7RR

On 26 Oct 1996, Thomas N Tumino wrote:

> Could someone be kind enough to tell me where I can buy a soldering iron
> with a small tip (suitable for soldering pins that are extremely close
> together on connectors) or tell me how I can solder wires to pins that are
> extremely close together but must not short?
>
> I have destroyed several connectors trying to solder small wires to the
> pins on these connectors...these connectors are driving me to insanity!
> Please e-mail or post any suggestions you have asap before I tear out all
> of my hair and run out of connectors..
>
> Thanks!
>
> Thomas N2YTF
>
>



From [e-mail] Wed Oct 30 06:37:12 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!vixen.cso.uiuc.edu!howland.erols.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Soldering small connections
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54shd8$[e-mail]> <[e-mail]>
Date: Sun, 27 Oct 1996 05:01:08 GMT
Lines: 44

In article <[e-mail]> Cliff
ord 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.  A chisel
>tip can be formed by simply your cutters and clipping off the end
>of the extended wire.  Normally you need less heat for small connectors,
>so the heat loss in the wire wrap is not an issue.  Cliff Buttschardt K7RR

That's a crude field expedient technique at best. The heat loss is
a problem because the expedient tip has low thermal mass, and cools
quickly when brought in contact with the work. If you can't quickly
supply enough heat to make up that loss, you'll have trouble getting
a good joint. If you just try to brute force it by wrapping it on a
high wattage iron, the expedient tip will oxidize so quickly before
being brought to the work that good heat transfer won't occur. If you
must use copper as an expedient tip, keep it well fluxed and tinned
at all times, and keep the thermal path as short as possible.

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
for as short a distance as possible while still letting you approach
the work. Radius back the shoulder for extra clearance. Part off at
about a two inch length, center drill and tap the other end to fit
on a 250 mil shaft threaded 1/4-20. Use a long 1/4-20 bolt for the
shaft, and fit a wooden handle. File a chisel point on the 50 mil
end.

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. The thermal mass of the large section coupled with the short
thermal path to the tip will allow you to do good work. (BTW, that's
why they're called soldering *irons*, you may need to keep several
in the fire at the same time if you're doing production work, but
be wary of having too many irons in the fire at once, you won't be
able to tend to all of them properly.)

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] Wed Oct 30 06:37:13 1996
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From: [e-mail] (J÷rgen J÷nsson)
Newsgroups: rec.radio.amateur.homebrew
Subject: subscribe
Date: 24 Oct 96 18:31:40 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

subscribe


From [e-mail] Wed Oct 30 06:37:14 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!world1.bellatlantic.net!news2.cais.net!news.cais.net!news1.exit109.com!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!news
From: "Robert R. Koblish" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Swan 500C docs?
Date: Sat, 26 Oct 1996 11:39:37 -0700
Organization: Erol's Internet Services
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: col-as13s51.erols.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01KIT (Win16; U)

Hi,

Can anyone supply, or tell me where to find, operation and service
manuals for a Swan 500C HF transceiver?

Will pay reasonable copying costs, or I can get them scanned and return
original + electronic version.

tnx,

Bob Koblish, N3HAT
Baltimore, MD
[e-mail]


From [e-mail] Wed Oct 30 06:37:15 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!newsgate.compuserve.com!ix.netcom.com!news
From: AC6V <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Swan 500C docs?
Date: Sat, 26 Oct 1996 16:35:13 -0700
Organization: Author
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: "AC6V@ac6v"@popd.ix.netcom.com
NNTP-Posting-Host: esc-ca6-41.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Sat Oct 26  6:34:11 PM CDT 1996
X-Mailer: Mozilla 3.0Gold (Win95; U)
To: "Robert R. Koblish" <[e-mail]>

Robert R. Koblish wrote:
>
> Hi,
>
> Can anyone supply, or tell me where to find, operation and service
> manuals for a Swan 500C HF transceiver?
>
> Will pay reasonable copying costs, or I can get them scanned and return
> original + electronic version.
>
> tnx,
>
> Bob Koblish, N3HAT
> Baltimore, MD
> [e-mail]

Hi Bob, The Swan manuals reside here in Oceanside -- former home of
Swan.

Its too long to copy so if you will -- go to my home page listed below
and click on "HAM RADIO MFGRS AND SALES" scroll down to Swan -- there is
info on manuals and repair. I have no peculinary interest in these -- so
this is FYI only.

I have a Swan 350 -- great ole rigs.

Good Luck
73
Rod in Oceanside, Ca
--
AC6V DX Reference Page at:  http://www.netcom.com/~ac6v/index.html

Hark for I have hurled my words to the far reaches of the earth!
What King of old could do thus??
..... AC6V


From [e-mail] Wed Oct 30 06:37:16 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!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: TRIDENT TR2400 - SCHEMACTICS?
Date: 23 Oct 96 13:37:44 GMT
Organization: ucsd usenet gateway
Lines: 21
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Some time ago I posted a message refered
to this TRIDENT TR2400 SCANNER.
I'm looking for it's schemactics, CPU pro-
gramming procedures, and so on.
If I know the "real" Manufacturer, will
help too. I have a "CPU" problem on such
rig and I'm trying to make the 1570 to
2060MHz range to work properly (I
have lack of sensibility on this GHz
range).
I supouse that this is any "asian" manu-
facturer, TRIDENT is just a label and ACE
Comms is the US distribuitors, but they
seems not have such information.
Any help?

Best regards. Marcus Ramos.
PY3CRX
Homebrewing from 170KHz to 10.25GHz
([e-mail])



From [e-mail] Wed Oct 30 06:37:17 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!vixen.cso.uiuc.edu!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Tobbe Frode)
Newsgroups: rec.radio.amateur.homebrew
Subject: UHF/SHF -kits from Australia??
Date: 29 Oct 96 14:13:29 GMT
Organization: ucsd usenet gateway
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I have heard about someone selling transverter-kits, to resonable prices in
Australia. Anyone know about that, adress, mail-adress etz.
73 de SM5NPV/Tobbe



From [e-mail] Wed Oct 30 06:37:18 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!news.uoregon.edu!newsfeed.orst.edu!news.orst.edu!news.cs.indiana.edu!news.nstn.ca!coranto.ucs.mun.ca!InfoNET.st-johns.nf.ca!sba3020
From: [e-mail] (Carl Hodder)
Newsgroups: rec.radio.amateur.homebrew
Subject: Uniden 8500XLT mod.
Date: 25 Oct 1996 22:34:38 GMT
Organization: St. John's InfoNET
Lines: 19
Message-ID: <54rf9u$[e-mail]>
NNTP-Posting-Host: infonet.st-johns.nf.ca
X-Newsreader: TIN [version 1.2 PL2]

I don't have the cellular mod for the BC8500XLT but I have recently
found an old newsgroup message from someone name Jon who claims to have
a mod to enter out of band frequencies on the 8500 between 25 to 1300 MHz
including the blocked out 800 MHz parts. He claims to have already
modified two BC8500XLT scanners. The message only talks about the mod
but does not include it.

I don't have this person's e-mail address but he goes on to say that
he will be contacting Popular Communications to see if they will mention
it in an up comming issue.

What I would like to see if someone has all the Popular Communications
between 1993 to 1996 and check in several places that it might be, like
the scanner column or letters area. Assuming that he contacted them and they
published it.

If someone does find it, knows of a similar mod or knows of this person
please E-mail me.



From [e-mail] Wed Oct 30 06:37:18 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!dispatch.news.demon.net!demon!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!EU.net!chsun!news.eunet.ch!usenet
From: sebastien <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Want parabola calculate program
Date: Sat, 26 Oct 1996 10:57:57 +0200
Organization: EUnet AG
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp3.infomaniak.ch
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; U)

Hello, thanks to read my. I'm HB9ICC in Geneva.

I'm looking for a program to calculate a parabola antenna.

If you have information or if you have this programm, please send me a

copy into my E-Mail.

Thanks in advance and very best 73's.

HB9ICC, Sebastien.

E-Mail :    [e-mail]


From [e-mail] Wed Oct 30 06:37:19 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!howland.erols.net!EU.net!enews.sgi.com!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!mongol.sasknet.sk.ca![e-mail]
From: [e-mail] (Doug Appleton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted Disc Seal Triode
Date: Fri, 25 Oct 1996 01:12:36 GMT
Organization: SaskNet News Distribution
Lines: 13
Message-ID: <54oev4$[e-mail]>
NNTP-Posting-Host: buckeye12.sk.sympatico.ca
X-Newsreader: Forte Free Agent 1.0.82

I am in need of a replacement oscillater tube for my Marconi TF1066B
signal generator. The tube is listed as a Mullard TD 03-10, or British
Service equivalent CV273, and a US equivalent 5861. Can anyone help
me??

Thanks
Doug Appleton VE5DA
1715 Boyd Street
Regina, Sask.,
Canada. S4V 1S5

email:  [e-mail]



From [e-mail] Wed Oct 30 06:37:20 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-peer.sprintlink.net!cs.utexas.edu!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!news.encore.com!psoper
From: [e-mail] (Pete Soper)
Subject: Re: Wanted Radio Receiver kit
Organization: Encore Computer Corporation
Date: Thu, 24 Oct 1996 15:19:56 GMT
Message-ID: <[e-mail]>
X-Nntp-Posting-Host: sysgem1.encore.com
References: <[e-mail]> <[e-mail]> <54mevi$[e-mail]>
Sender: [e-mail] (Usenet News)
Lines: 13

I bought a Ten Tech "any band" direct conversion receiver
kit and built it for 40 meters. It was straight forward to
build and works pretty well for something that cost $30-something.
Drift before warmup is significant and the RF gain has to be
used carefully where strong signals might be present. I put the
biggest knobs I could find on the tuning controls and getting
SSB signals tuned properly is still very very touchy. Overall
I'm very satisfied as it provides a prospective new Ham
with exactly what she needs for CW practice at this stage.

Regards,
Pete
KS4XG


From [e-mail] Wed Oct 30 06:37:21 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!feed1.news.erols.com!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!altitude!usenet
From: Madjid VE2GMI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted Radio Receiver kit
Date: Fri, 25 Oct 1996 12:30:45 -0400
Organization: ORION Microsystems
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <54mevi$[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)

Kent Farnsworth wrote:
>
> Because the folks here don't want you to know WHERE Ten Tech is:
> Here is a toll free phone number for you:
>
> 1-800-833-7373

Sorry, I forgot to post the WWW address for Ten Tec.
They are well hidden but they are on the Web at:

http://www.mvangel.com/ten-tec/

Madjid VE2GMI


From [e-mail] Wed Oct 30 06:37:22 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!howland.erols.net!EU.net!enews.sgi.com!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!lbliao
From: [e-mail] (lbliao)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: What is the maximum gain that you can get out of a transistor?
Date: 26 Oct 1996 02:09:47 GMT
Organization: California Institute of Technology, Alumni Association
Lines: 7
Message-ID: <54rrtb$[e-mail]>
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The above question is asked in academic vain. I am interested in finding out
various viewpoints.

Thanks a lot!
lbliao




From [e-mail] Wed Oct 30 06:37:23 1996
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From: Shane Eric Taylour <[e-mail]>
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: Sat, 26 Oct 1996 17:27:40 +1000
Organization: Royal Melbourne Institute of Technology, Melbourne, Australia.
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On 26 Oct 1996, lbliao wrote:

> The above question is asked in academic vain. I am interested in finding out
> various viewpoints.
>
> Thanks a lot!
> lbliao

Lbliao,

1. It depends upon what you define as a 'transistor'. There are darlington
transistors (two transistors in cascade) within a standard TO-220, TO-126
or even a TO-92 package which have current gains (Beta) of 1500-5000+.
Most conventional BJT's have a Beta below 800.

2. It depends upon the application of the transistor. What are you
defining as 'gain'? I assume you mean Beta. A given transistor has a
different AC current gain to its DC current gain. For example, a
transistor with a DC Beta of 100, will not have this gain when used as an
(AC) amplifier.

These are just my opinions.

Regards,

Shane E. Taylour,
([e-mail])

------------------------------------------------------------------------------
Shane Eric Taylour, Stud.I.E.Aust ([e-mail])
Royal Melbourne Institute of Technology  (Melbourne, Australia)

"He who is afraid to ask is ashamed of learning."  - Danish Proverb

"Two roads diverged in a broken wood. I took the one less traveled by."
                                                   - Robert Frost



From [e-mail] Wed Oct 30 06:37:24 1996
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From: [e-mail] (terry moreau)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: Sat, 26 Oct 1996 15:22:01 GMT
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For AC signals a single transistor of any type can be configured to have
infinite gain...an oscillator is a good example.

Ahhh...that's the power of positive feedback!


In practice, a gain of more than 20, from DC to 100Mhz, and having superb
operating point stability, all in a single stage, is a satisfactory
accomplishment.



From [e-mail] Wed Oct 30 06:37:25 1996
From: [e-mail] (Sam Cederas)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: Sat, 26 Oct 1996 19:58:13 GMT
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        I used to have a lot of fun changing the bias on transistors
in school until they smoked.  I do not remember what gain figures we
attained as it has been a long time.  I hope that you are able to mess
around with different bias settings and find out for yoursel!!!
        It sure is a lot of fun. You bring back some pleasant
memories!   I guess we reached the point of saturation way before we
smoked the transistors....but it was sure neat to find where the point
of saturation was for typical audio tansistors.
        -take care.
        Sam Cederas  AD4PY
        [e-mail]
        Cary, N.C.



On 26 Oct 1996 02:09:47 GMT, [e-mail] (lbliao)
wrote:

>The above question is asked in academic vain. I am interested in finding out
>various viewpoints.
>
>Thanks a lot!
>lbliao
>
>



From [e-mail] Wed Oct 30 06:37:26 1996
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: What is the maximum gain that you can get out of a transistor?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54rrtb$[e-mail]>
Date: Sat, 26 Oct 1996 21:16:00 GMT
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In article <54rrtb$[e-mail]> [e-mail] (lbliao
) writes:
>The above question is asked in academic vain. I am interested in finding out
>various viewpoints.
>
>Thanks a lot!
>lbliao

The power gain of a Class A common emitter MOSFET is infinite in
theory. In practice there may be some leakage current in the gate
which makes the power gain less than infinite. For AC signals, the
gate capacitance charge/discharge characteristic means some finite
amount of driving power is required, so power gain is not infinite.
Still, it is possible to achieve very large power gains with small
signal Class A amplifiers.

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] Wed Oct 30 06:37:27 1996
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From: altavoz <[e-mail]>
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: Sun, 27 Oct 1996 00:08:15 -0700
Organization: worldnet.att.net
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lbliao wrote:
>
> The above question is asked in academic vain. I am interested in finding out
> various viewpoints.
>
> Thanks a lot!
> lbliao


altavoz: 35dbv bipolar ( in op amps) . MOSFETS/FETS have lower
volt gain .

______End of text  from altavoz___________


From [e-mail] Wed Oct 30 06:37:27 1996
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From: altavoz <[e-mail]>
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: Sun, 27 Oct 1996 12:58:35 -0800
Organization: worldnet.att.net
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lbliao wrote:
>
> The above question is asked in academic vain. I am interested in finding out
> various viewpoints.
>
> Thanks a lot!
> lbliao



altavoz: About 35 dbv .
--

______End of text  from altavoz___________


From [e-mail] Wed Oct 30 06:37:29 1996
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From: [e-mail] (Winfield Hill)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: 28 Oct 1996 11:52:40 GMT
Organization: The Rowland Institute for Science
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Charles Wenzel,  <[e-mail]> said...
>
> A really crude but often effective estimate of a bipolar transistor's voltag
e
> gain is simply 38 times the voltage across the collector resistor. The beta
> of the transistor mainly affects the input impedance ....
> I tried a 2N4401 with about 35 volts across the collector resistor and got a
> gain near 1000 which is a bit shy of 1330 but pretty impressive anyway! I
> could use higher current to swamp the collector shunt losses but then the
> input impedance would become hopelessly low. I wonder how well my
> small-signal 300 volt transistors would do!

Good for Charles.  After watching the off-base answers on this thread for a
while, I wondered if anybody was going to come up with the straight-forward
answer!

In fact it's not crude at all, and is theoretically exactly 39.5 V at
"standard" room temp (20C, 68F) and 39.2 at the temperature I like, (22C, 72F)
.

The gain of a single stage is g_m * R, where R is the load.  We know one of th
e
most predictable things about a transistor is its transconductance, which can
be derived from the physics of the transistor with the Ebers-Moll equation (se
e
AoE pg 80 - take the derivative).   The transconductance is dependent upon the

collector current and is g_m = 1/r_e = I / V_T where V_T is kT/q = 25.3mV at
room temp (20 deg C).  Since k, T and q are all physical quantities having
nothing at all to do with the transistor's design and construction, this is a
very dependable parameter.

As Charles said, the voltage drop across the collector resistor is the key.
This is because of ohms law, I = V / R so that g_m = I / V_T  =  V / (R * V_T
)
and the gain G = R * g_m = R * V / (R * V_T) and R cancels out leaving
G = V / V_T.   Neat huh!

So if Charles takes a 300V supply and biases his 300V transistor at 10V, so
there's 290V across the load resistor, he'll get a small signal gain of over
11,000. !!  Of course, this ignores the Early effect (pg 75), which does depen
d
upon device design and will reduces this number.

In any amplifier it's always nice to have a low-impedance output, as can be ha
d
with a transistor emitter follower.  Even tho a follower stage has a gain of
only 1, there's a simple trick which allows very high gain for the two-
transistor pair, without using HV transistors or 300V supplies.  I leave this
as an exercise for the reader!
--
Winfield Hill    [e-mail]        _/_/_/            _/_/_/_/
The Rowland Institute for Science      _/    _/   _/_/    _/
Cambridge, MA USA 02142-1297          _/_/_/_/  _/   _/  _/_/_/
                                     _/    _/  _/   _/  _/
http://www.artofelectronics.com/    _/    _/    _/_/   _/_/_/_/



From [e-mail] Wed Oct 30 06:37:29 1996
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From: bwilson@newshost (Bob Wilson)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Followup-To: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Date: 28 Oct 1996 20:41:27 GMT
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lbliao ([e-mail]) wrote:
: The above question is asked in academic vain. I am interested in finding out
: various viewpoints.

You talking current gain, or voltage gain, or power gain??

Bob.


From [e-mail] Wed Oct 30 06:37:31 1996
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From: [e-mail] (Mike McCarty)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: 29 Oct 1996 01:14:57 GMT
Organization: DSC Communications Corporation
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In article <[e-mail]>,
Sam Cederas <[e-mail]> wrote:
)       I used to have a lot of fun changing the bias on transistors
)in school until they smoked.  I do not remember what gain figures we
)attained as it has been a long time.  I hope that you are able to mess
)around with different bias settings and find out for yoursel!!!
)       It sure is a lot of fun. You bring back some pleasant
)memories!   I guess we reached the point of saturation way before we
)smoked the transistors....but it was sure neat to find where the point
)of saturation was for typical audio tansistors.
)       -take care.
)       Sam Cederas  AD4PY
)       [e-mail]
)       Cary, N.C.
)
)
)
)On 26 Oct 1996 02:09:47 GMT, [e-mail] (lbliao)
)wrote:
)
)>The above question is asked in academic vain. I am interested in finding out
)>various viewpoints.
)>
)>Thanks a lot!
)>lbliao
)>
)>

When using constant current sources as the collector loads, IC designers
routinely get gains over 1000 from a single transistor.

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] Wed Oct 30 06:37:32 1996
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From: J M Woodgate <[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: Mon, 28 Oct 1996 22:49:45 +0000 (GMT)
Organization: J. M. Woodgate and Associates
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In article <[e-mail]>, Sam Cederas
<URL:mailto:[e-mail]> wrote:
>
>       I used to have a lot of fun changing the bias on transistors
> in school until they smoked.  I do not remember what gain figures we
> attained as it has been a long time.  I hope that you are able to mess
> around with different bias settings and find out for yoursel!!!
>       It sure is a lot of fun. You bring back some pleasant
> memories!   I guess we reached the point of saturation way before we
> smoked the transistors....but it was sure neat to find where the point
> of saturation was for typical audio tansistors.
>       -take care.
>       Sam Cederas  AD4PY
>       [e-mail]
>       Cary, N.C.
>
>
>
> On 26 Oct 1996 02:09:47 GMT, [e-mail] (lbliao)
> wrote:
>
> >The above question is asked in academic vain. I am interested in finding ou
t
> >various viewpoints.
> >
> >Thanks a lot!
> >lbliao
> >
> >
>

The maximum gain you can get depends on what circuit configurations you
allow. If you allow positive feedback, the answer is 'infinite'. Then again,
how many 'non-ideal' properties will you take into account? Finite output
resistance is easily allowed for, then comes internal c-b feedback
resistance, then capacitances. I think you need to define the problem more
closely in order to get useful responses.

--
Regards, John Woodgate Tel. [phone]
 Fax [phone] OOO (Own Opinions Only)



From [e-mail] Wed Oct 30 06:37:33 1996
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: What is the maximum gain that you can get out of a transistor?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54rrtb$[e-mail]> <[e-mail]> <5526q8$[e-mail]>
Date: Tue, 29 Oct 1996 22:41:28 GMT
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In article <5526q8$[e-mail]> [e-mail] (Winfield Hill)
writes:
>Charles Wenzel,  <[e-mail]> said...
>>
>> A really crude but often effective estimate of a bipolar transistor's volta
ge
>> gain is simply 38 times the voltage across the collector resistor. The beta
>> of the transistor mainly affects the input impedance ....
>
>Good for Charles.  After watching the off-base answers on this thread for a
>while, I wondered if anybody was going to come up with the straight-forward
>answer!

Always nice to hear from the master, however is this really the straight
forward answer we're looking for? A transformer can offer voltage "gain".
What separates an active device like a transistor from a passive device
like a transformer is the possibility of *power gain*. Given a power
gain, we can easily make practically any voltage we like with a step up
transformer in the drain circuit.

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] Wed Oct 30 06:37:34 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!newsfeed.concentric.net!news-master!news
From: Bill Terrier <[e-mail]>
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: Tue, 29 Oct 1996 21:26:53 -0800
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Do you suppose that he's talking about Darlington?


From [e-mail] Wed Oct 30 06:37:35 1996
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From: [e-mail] (Dave Horsfall)
Subject: Re: www.hamradio-online.com: Is Ham Radio Still Relevant?
Message-ID: <[e-mail]>
Organization: FGH Decision Support Systems
References: <5449pf$[e-mail]> <[e-mail]>
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Get this massive cross-post out of aus.radio.amateur.*, or get it cancelled.

--
Dave Horsfall VK2KFU  [e-mail]  Ph: [phone]  Fx: [phone]
FGH Decision Support Systems P/L, 77 Pacific Hwy, Nth. Sydney, 2060, Australia


From [e-mail] Wed Oct 30 06:37:36 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (De Bruijn)
Subject: xtal filters, can I replace?
Keywords: xtal filters
Message-ID: <[e-mail]>
NNTP-Posting-Host: sun010.leeds.ac.uk
Organization: University of Leeds, England
Date: Mon, 21 Oct 1996 11:09:58 +0100 (BST)
Lines: 7

I've been building the G4BWE 80m / 20m superhet receiver. It has a xtal filter
 made up from 8.87...MHz colour tv xtals (8 of them). As I don't have the faci
lities for accurately checking their frequency I was thinking of using a 9MHz
filter from somewhere. Is this alright (the 5-5.5 MHz VFO should be able to de
al with the IF change no problems) from the point of view of input and output
impedances and other stuff like that. If so then where in the UK would I be ab
le to get these xtal filters? TIA

                                73 de Laurens RS171840






From [e-mail] Wed Oct 30 06:37:37 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Pat Quinn)
Subject: Yaesu 726r question
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I have a 726r which the meter bulb (led) has burnt out...I've tried to
locate a replacement through a few dealers/ and they all don't supply the
replacement bulb (they all said i'd have to get it through Yaesu). I've
e-mail Yaesu requesting the steps on getting a replacement bulb but
haven't heard from them yet.
Does anyone know what its rated at (ma)? Or a part # that I could use to
find one at RadioShack?

Thanks Pat,

--
******************************************************************************
 Pat Quinn 19790 Winner Ln. Stewart, Ohio 45778   [phone]
 e-mail:  [e-mail]     ARS: KD8MN  pkt.145.01  voice 145.15-
******************************************************************************


From [e-mail] Wed Oct 30 06:37:38 1996
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From: [e-mail] (asplund)
Newsgroups: alt.radio.scanner,rec.radio.scanner,rec.radio.amateur.misc,rec.radio.amateur.equiptment,rec.radio.shortwave,rec.radio.amateur.homebrew
Subject: Yaesu FT-530 giveaway (practically)
Date: 29 Oct 1996 19:03:43 -0800
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Summary: Yaeso FT-530 giveaway (practically)
Keywords: Yaesu, radio, sale, cheap
Xref: news1.epix.net alt.radio.scanner:40948 rec.radio.scanner:69466 rec.radio.amateur.misc:117200 rec.radio.shortwave:87587 rec.radio.amateur.homebrew:20593

Hello all,

Awhile back, I posted the following for a friend, at the time he sold all
the radios he was willing to give up.  Now he wants to sell the rest, AND
has DROPPED the price $150!!

-----------------------------------------------------------------------------
A friend of mine has a "bunch" of Yaesu Dual Band Radios which he would like
to sell at a great price.  He purchased them for the emergency response group
which he is envolved in and has decided to sell them and get radios which
do not have as many functions and features.  His policy appears to be "the
simpler the better" for emergencies.

Yaesu FT-530 Dual Band HT
Yaseu Standard 2 Watt Battery
Yaesu Hi-Power 5 Watt Battery
Yaesu Rapid Charger (for both of the above batteries)
Yaesu Standard Battery Charger
Yaesu External Speaker/Mic
Yaesu Standard "Rubber Duck" Antenna
Antenna Specialist's Dual Band "Rubber Duck" Antenna

Each of them have had the out-of-band modification done by a local Southern
California Dealer at time of purchase.  They will be sold on a first come
first serve basis.

He is asking $320.00 for each radio.  They may be placed on a credit card for
no additional fee, and there is a $5 shipping charge to anywhere in the US via
UPS insured ground.

If you are interested, please call Steve at 818-502-0000.


(I am posting this for a friend who does not have access to the newsgroups,
please do not write me back.)
--Daryl Asplund


From [e-mail] Thu Nov 07 21:14:18 1996
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From: [e-mail] (Joe Leikhim)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: magnetism immune switch
Date: Sun, 27 Oct 1996 23:07:33 GMT
Organization: CMDS News machine
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Robert Bissett <[e-mail]> wrote:

>Dave Bullock G6UWO wrote:
>>
>> Heeelllp I need to create a changeover contact in a extremely magnetic
>> environment. Relays are no good

Why not try a solid state relay or similar optocoupler??



From [e-mail] Thu Nov 07 21:14:19 1996
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From: [e-mail] (Andy Jeutter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Amateur Radar
Date: Tue, 29 Oct 1996 07:44:07 GMT
Organization: Eastman Kodak Company
Lines: 6
Message-ID: <554ckf$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mgpc3.ag01.kodak.com

Ramsey Electronics offers a "Speed Radar" kit for
about $100. Does anybody have any experience with
it?

73, Andy DL4SEI



From [e-mail] Thu Nov 07 21:14:20 1996
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From: [e-mail] (G4YNM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Problems making PCBs
Date: 29 Oct 1996 15:01:38 -0500
Organization: America Online, Inc. (1-800-827-6364)
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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

You'll get distortion and a non linear copy, eventually you'll find that
devices and CB holes don't line up if you photocopy stuff.

>3 Exspose a P20 PCB
>4 Develope the P20
>5 Etch
>
>The problem seems to be in the plastic film that is not enough
>transparent, and the black areas not enough black giving poor contrast
>and the areas that I want to be removed often have some P20 left on
>the copper despite the time I try to develope the traces.

Yep I had this problem. I use acetate sheet that is opaque and diffuses
the ultra violet light. I also experimented with lots of small off cuts of
PCB until I found the correct time duration for the brand of PCB and brand
of acetate sheet.

I actually print the PCB layout direct through my laser onto the actetate
sheet with the laser printer toner control set to maximum. Even so large
copper areas don't come out too well.  Thin (25 thou) tracks do.  The
laser non-linearity is taken account of by an XY compensation in the CAD
package.
>
>Have anyone found a transparent plastic sheet that can easily be
>obtanined and be used in either a laser printer and/or a copier to
>give fair results?
>
>73 Lasse SM5GLC



From [e-mail] Thu Nov 07 21:14:21 1996
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From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CB to 10 conversions
Date: 29 Oct 1996 21:04:28 GMT
Lines: 46
Message-ID: <555rgs$[e-mail]>
References: <[e-mail]>
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In article <[e-mail]>, [e-mail] says...
>
>Dean, KC5NG-
>  Dean, since the type exceptance done by the FCC on CB's a few
>years ago, what is the:
>    1.  Best rig to convert? ( i.e. gives the most features such as
>memory, etc.)
>    2.  The cheapest to convert? ( just change a cheap PLL crystal or a
>chip)
>     3.  The easiest? ( all parts identifiable and visable)
>
>I have been thinking about a CB to 10 for the coming sunspot activity
>and would appreciate any input to answer these questions, any
>suggestions?
>
>73 - 72 ( feelow QRPer)
>John  <N3REY>
>Always QRP!

You didn't specify what you want, so I'll assume you mean a SSB radio
(as opposed to a-m or FM).

The PLL-synthesized SSB rigs made in the late 1970s and early 1980s are
going to be the easiest to convert... change one crystal and re-tune, and
you're on the air.  I couldn't begin to name them all.

I've converted Cobra 148GTLs, Sears RoadTalker 40s, Penneys 6246s (I have
one of these right now), and many others.

Avoid the older 23-channel crystal-mixed rigs (too costly to convert).

I'm not familiar with any CBs that have scanning or memories (been out of
the CB market for about 20 years, since I became a ham).

--
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] Thu Nov 07 21:14:24 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, 29 Oct 1996 17:39:25 -0700
Organization: WestNet
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]> <555qnt$[e-mail]>
NNTP-Posting-Host: term2-19.vta.west.net

In article <555qnt$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

Hello, Tom
snip...
RE: Mr. Foote:
> That might explain it. He might have misunderstood the engineering people.
> That's the danger of hearsay.

Everything Foote told me was subsequently confirmed by inspection of kaput
tubes with a microscope.  Color photos were published in *QST*.

> The high power tube (that Foote misled you about) fell victim to heating
> because of multiple causes.
Sounds to me like a Klystron.  Foote worked in the Power Grid Division.
Klystrons are not power grid tubes, Tom.  //  You speak as though you
heard the conversation between yours truly and W. Foote.  Are you psychic?


Mr. Foote said that during the testing phase of the development of the
8877, sudden failure took place.  High leakage was observed in tubes that
were known to have had good vacuums shortly before testing began.  He said
that when kaput 8877s were dissected, it was found that the high leakage
was due to condensed particles of gold that had evaporated from the grid.
When seen under a 50x microscope, these particles appear to be perfect
spheres.  Foote said that the 8877 engineers determined that the
phenomenon was caused by an oscillation, most likely in the UHF range.
-----------------------
e-mail copy to Mr. Rauch

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Thu Nov 07 21:14:27 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Best CB's?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <54ecrs$[e-mail]> <[e-mail]> <555619$[e-mail]> <[e-mail]>
Date: Wed, 30 Oct 1996 03:51:44 GMT
Lines: 28

In article <[e-mail]> Woody White <woody.white@worldnet.
att.net> writes:
>
>I would like to hear a serious answer.  I have been a homebrewin' ham off
> and on since '62  but know nothing about cb brand/quality.  What I wish
>to know is what rig might be found at a low price and work well as an IF
>(SSB) for my homebrew transverters. ...Woody

Well, remember that these things are built to price, and a pretty
low price at that. The filters usually aren't very good, and of
course they're channelized. The ones made in the last several years
are hard to move off the CB channels, which may not matter if you're
using it with a homebrew transverter, but they're also generally
hard to modify to slide *between* channels. Older units could
usually be modified easily so that the clarifier moved transmit
as well as receive. HyGain and Cobra both made units that were
easy to convert. I'd be checking garage sales for older SSB
units by either company.

There's usually a little bitty ad in QST for a book on 11m->10m
conversions. Getting a copy of that might be worth your while.
It should point you toward radios that are easy to modify.

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] Thu Nov 07 21:14:28 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Hallicrafter Transmitter Manual
Date: Wed, 30 Oct 1996 04:21:42 GMT
Organization: Central News Services
Lines: 12
Message-ID: <556l3k$[e-mail]>
NNTP-Posting-Host: dialin63.oanet.com
X-Newsreader: Forte Free Agent 1.0.82

There is a member of our Amateur Radio club that has a Hallicrafter
Transmitter Model HT-40 built from a kit circa 1960.  The transmitter
covered from 160m thru 6m.  He is looking for the manual that goes
with it as over the years some of the parts have been used for other
projects. If anyone has a copy, please e-mail me and I will contact
the Amateur.

Thanks,

Harry
VE6 HPA



From [e-mail] Thu Nov 07 21:14:29 1996
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From: "David W. Foster" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: PC Based Digital 'Scope?
Date: Tue, 29 Oct 96 21:40:07 PDT
Organization: XMission Internet (801 539 0900)
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I've been unsuccessful in trying to purchase a PC based Digital Oscilloscope
board.  Don't need much bandwidth (maybe 1 Mhz), two channels, and trigger
inputs.  Any suggestions??

Tnx,

Dave
KE6MOM



From [e-mail] Thu Nov 07 21:14:30 1996
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From: [e-mail] (Brett Collins)
Newsgroups: rec.radio.amateur.homebrew
Subject: switching power supply mod
Date: Wed, 30 Oct 1996 10:52:10 GMT
Organization: Provide.Net NetNews Site
Lines: 19
Message-ID: <55724i$[e-mail]>
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I have an old switching power supply from a large computer.
It says 5 volts at 50 amps. I was wondering if I could modify it so
that it would deliver say 12 volts at 20 or so amps.
What do ya think about this:

1.  change the output filter caps to 16vdc

2.  tear apart the trans and rewrap the secondary with smaller
     guage and proper turns ratio for higher E and lesser I.

3.  change resister divider network that feeds the sampler/error amp

Will it work?   Will I have saturation problems?

Any advice would be appreciated.

Thanks, Brett



From [e-mail] Thu Nov 07 21:14:31 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 30 Oct 1996 13:08:57 +0000
Organization: IFW Technical Services
Lines: 22
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
 <555qnt$[e-mail]>
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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?

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] Thu Nov 07 21:14:35 1996
Newsgroups: sci.electronics.design,sci.electronics.misc,rec.radio.amateur.homebrew
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From: [e-mail] (Bill Turner)
Subject: Re: What is the maximum gain that you can get out of a transistor?
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Xref: news1.epix.net sci.electronics.design:24232 sci.electronics.misc:16584 rec.radio.amateur.homebrew:20608

Nobody seems to want to answer the poor guy's question.

For current gain, many transistors have gains of 100-200 and I've seen some up
to around 400 or so.  I'm sure some specially-made units can be had with even
higher gains.  There are Darlington-type units with much higher current gains,
but they are really two (or more) transistors in a single package, so they
don't really qualify as "a" transistor.

For voltage gain, the answer depends more on the load in the collector circuit
than the transistor, assuming you're using a common emitter amplifier.  With a
very high load impedance, gains of tens of thousands are possible, although
designing a usable circuit with that much gain can be tricky, to say the
least.

For power gain, the results depend more on the rest of the circuit than on the
transistor, but gains of 15-20 db are not unreasonable and a clever designer
can no doubt squeeze out more than that.  Again, this is not an area where you
want to push the limits because single-stage, high-gain amplifiers are
naturally unstable and will try to oscillate (this is where the cleverness
comes in).

Hope this helps.

73, Bill W7LZP
[e-mail]


From [e-mail] Thu Nov 07 21:14:36 1996
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.webspan.net!ix.netcom.com!news
From: [e-mail](Gerald Schmitt )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Removing an Antenna
Date: 30 Oct 1996 14:34:18 GMT
Organization: Netcom
Lines: 23
Message-ID: <557p1a$[e-mail]>
References: <01bbc622$542020c0$[e-mail]>
NNTP-Posting-Host: sfe-nm1-04.ix.netcom.com
X-NETCOM-Date: Wed Oct 30  6:34:18 AM PST 1996

In <01bbc622$542020c0$[e-mail]> "Jon Ralls"
<[e-mail]> writes:
>
>I mounted a 2 meter ant. to my window on a van and I would like to
move it.
>The problem is that it is stuck to the window with the adhesive that
came
>on it. The antenna was made by Radio Shack and the guys there don't
have a
>clue if it can be removed without damaging the antenna. Anybody got
any
>ideas? Thanks.
>Jon Ralls
>KB0FKI

Easiest way use a heat gun like those you use for shrink tubing. Don't
get it too hot about 120 F is enough for most glues. Remove the excess
glue by scraping with a stainless steel single edge razor blade.
Stainless blades won't scratch the glass, it has to do with the way
stainless micro machines.

                                73 Jerry



From [e-mail] Thu Nov 07 21:14:38 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: 30 Oct 1996 14:36:24 GMT
Organization: The Rowland Institute for Science
Lines: 91
Message-ID: <557p58$[e-mail]>
References: <54rrtb$[e-mail]> <[e-mail]> <[e-mail]>
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Bill Baka,  <[e-mail]> said...
>
>Charles Wenzel,  <[e-mail]> said...
>>
>>  A really crude but often effective estimate of a bipolar transistor's
>>  voltage gain is simply 38 times the voltage across the collector resistor.

>
> Actually it ranges from 1 to 100+ and depends more on the emitter resistor
> ratio to the collector resistor.

Of course, Bill, emitter degeneration, or any other type of feedback will
reduce voltage gain.  However, since here we're discussing "what is the maximu
m
(voltage) gain that you can get..." it's clear that introducing gain-reducing
components or techniques will simply muddy the waters.

> Power transistors can have a Beta or current gain of only 10, where most
> generic 2N3904 NPN types will run about 100, some special types ...

It cannot be stated often enough that in a properly-designed common-emitter
amplifier stage, the current gain of the transistor should not be a factor in
determining voltage gain.

> Darlingtons can go up to about 10,000, but don't count on frequency response
.

This is totally misleading and simply incorrect.  The proper use of a
darlington transistor circuit does not reduce frequency response, but often
enhances it.

> ... Actually, you can get a gain of 100,000, not that it will be good for
> much.  No emitter resistor and a 1 meg collector resistor. As soon as you
> pass the Base-Emitter thresh hold the 1 meg will saturate. Useless, but a
> demonstration.

Now you've really got me going! Bill I think these generalizations are not
useful and inaccurate.  First, without an emitter resistor, the quick formula
for low-frequency voltage gain of an unloaded common-emitter stage, adjusted
for a given load resistor voltage V, is just G = V * kT/q and as this formula
shows, the actual value of the load resistor has nothing to do with the gain.


Let's make some amplifiers with different collector load resistors.  We'll
assume a +9V supply and bias the transistor collector at +4V, by means not
covered here. Emitter to ground.  We'll assume 5pF of collector capacitance,
and a low-Z driving source.

    collector  collector   frequency   theoretical
    resistor    current    response   voltage gain     comments
    ---------  ---------   --------   ----------      -----------
     10k        500uA      3.2MHz        200      AM-band radio stations
    100k         50uA      320kHz        200
     1Mohm        5uA       32kHz        200      9V battery lasts a long time
    10M          0.5uA      3.2kHz       200
    22M          0.11uA     1.5kHz       200      light-powered circuits
   100M           50nA       320Hz       200      "good for a demonstration"

Note that the voltage gain doesn't change.  Also note the perfectly acceptable

32kHz bandwidth with a 1M-ohm collector resistor.  Are the low-current version
s
useless except for a demonstration?  Of course not.  Many real-world
applications get along well with sub-kHz signals and are forced to work with
very low supply currents.  I won't even start the long list.

Now Bill, wrt "Actually, you can get a gain of 100,000 ..." I should point out

that a more complete formula for CE stage gain is G = g_m * (R_L || r_o) where

r_o results from the output conductance of the transistor due to the Early
effect.  The actual fact is that the Early effect may well prevent a gain of
25,000 let alone 100,000 in a single-transistor CE amplifier.  {This is not to

say a higher single-stage gain cannot be obtained when more than one transisto
r
can be used.]

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.  See for
example, http://fnctsrv0.chips.ibm.com/products/ams/tech/Tquickref.html

The beta-VA product is an industry figure-of-merit parameter, often reported b
y
industry gurus like Frank Goodenough.  It's a critical issue for example in
designing high-performance current sources.  E.g. see
http://www.ee.washington.edu/conselec/W94/aleph/aleph498.htm

In conclusion, Bill, I'd like to say that we could all use a little more
reading!

Keep the faith.

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



From [e-mail] Thu Nov 07 21:14:39 1996
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From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 30 Oct 1996 10:01:19 -0500
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To: W8JI Tom <[e-mail]>

W8JI Tom wrote:

> In article <[e-mail]>, Zack Lau <[e-mail]> writes:
>
> >       How about using ferrite beads over wires instead of resistors?
> >I've heard reports that they are almost purely resistive at VHF.
> Shouldn't
> >the HF bypass choke keep the beads out of saturation if the system is
> >properly designed?

> Since this is almost always (with a proper layout) a single frequency area
> problem, we want to add as much damping as we can over the undesired
> frequency range.
>
> The problem with ferrites is the transition from inductive to resistive
> behavior (loss of Q)  is generally very slow as frequency is raised. What
> we want is an abrupt change, where loss is very low at desired operating
> frequencies (allowing good efficiency) and suddenly the loss is very high
> at the undesired frequency.
> How is the non-inductive resistor better than a ferrite as the lossy
element at assisting in the abrupt change?  Doesn't the resistor rely
on the inductor to obtain the "abrupt change?"

Being a "single frequency area problem", what do you think about using
inductive resistors in a clever design?  While not everyone has
a network analyer for alignment, why not use an antenna analyzer
as an inexpensive adjustment guide?
--Zack KH6CP/1

> In the ideal case we would have the most rapid "insertion" of damping
> resistance possible as frequency is increased, short wide grid leads and
> short wide anode connections. All resitance should be concentrated at one
> area so it can be adjusted to the correct value for maximum damping.


From [e-mail] Thu Nov 07 21:14:41 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 30 Oct 1996 10:31:37 -0500
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Gary asked about the MLA. One reason I suspect you've had such good life
is you know how to operate the amplifier, many or most Hams do not.

If you recall that the root of our disagreement about the tetrode
articles. My position was tetrode PA's were not as forgiving in the hands
of the general population. With focused beam cathode triodes, they have
some tetrode-like charicteristics. One is that a very slight amount of
mis-tuning or excessive drive will cause grid current to skyrocket. While
grid current changes slowly with load adjustment in tubes like the 3-500Z,
it varies rapidly in the 8873-8875 series. Not only is the potential for
excessive grid current by mis-tuning increased, but the grid is many times
smaller in mass. It takes less time to heat the grid (low thermal
inertia), and it has less area to dissipate unwanted heat. It is also
closer to the hot cathode.

If any amplifier needed grid dissipation protection, it was the MLA. Yet
some MLA's had no grid meter at all, let alone an overload circuit. To
give you an idea how quickly a tube like that can be ruined, I wasted a
3CX800 in abouta matter of seconds when I was prototyping a 3CX800 PA. I
hadn't installed the grid trip circuit yet, and was doing some tank
changes. After three or four SHORT hits with a 100-150 mA of grid current,
the tubes were history. When I cut one open, the gold was boiled off the
grid.

Not having electronic grid protection is a mistake. A fuse is not fast or
reliable enough to control dissipation (you can find data on failure times
with various overloads in a Buss catalog).

Other than that, and Dentrons failure to include a surge limiting
resistance in the anode lead (it should be a 25 ohm or larger energy
absorbing type of resistor with a high voltage breakdown),  Dentron amps
shared a few other common flaws:

1.) Voltage at the heater pins were often excessive (and don't run it too
low or you'll strip the cathode)

2.) The bleeders were carbon resistors, they age down in value unevenly,
and eventually cause the electrolytics to fail. Bleeders should be metal
film or wire wound, with a value of bleeder current normally (since they
equalize the caps) 10 to 20 times greater than the expected leakage
current in the caps. (The formula actually must include the safe voltage
delta allowed across the caps and the leakage current delta expected, it's
ohms law...I'm sure you can figure out the method since the goal is to
never have the voltage rating of any cap exceeded due to leakage
resistance tolerances)

3.) Cooling was marginal in most PA's

4.) They used 300-400 volt resistors across the HV diodes

5.) Tank Q was goofy on some bands (that really only hurts efficiency a
tiny bit)

6.) Input circuits were lacking, or located too far from the tubes, or had
the wrong values for a proper match

It wouldn't be a bad idea to measure the filament inrush on a triggered
scope, since the filament is run off a very large transformer.
Heater/filament damage is accumulated thermal damage, so failure depends
on the number of times you cycle the filaments off and on as well as the
amount of overload. Just to be safe, you might check it. Two times
operating value for inrush virtually elimates any chance inrush life
shortening, although if the filament isn't cycled off an on a lot more can
be tolerated.

The easy way to measure this is clip the isolated scope probe across a
small area of filament wiring on one side of the filament and click the
amp on from a cold start several times (I use a triac that triggers at
zero voltage, because that allows the filament to "feel" the impact of the
entire full first cycle, and gurantees maximum inrush) watching the
voltage drop (it represents current).

Almost any amplifier with a separate transformer is OK for inrush with no
other protection as long as the transformer is marginal for the filament
current rating.

73 Tom


From [e-mail] Thu Nov 07 21:14:42 1996
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From: "Peter Gottlieb" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Removing an Antenna
Date: 30 Oct 1996 15:47:07 GMT
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Jon Ralls <[e-mail]> wrote in article
<01bbc622$542020c0$[e-mail]>...
> The problem is that it is stuck to the window with the adhesive that came
> on it.

You could try VERY CAREFULLY using a hot air gun to heat up the window
around where the antenna is mounted and see if that softens the adhesive.
Be VERY uniform with the heating so as to not crack the window.

Alternatively, perhaps you can find a solvent that attacks the adhesive
used, and keep applying it while slowly making repeated passes at the edge
with a single edged razor blade.

Otherwise, live with it attached or destroy it to remove.



From [e-mail] Thu Nov 07 21:14:43 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, 30 Oct 1996 10:06:48 -0700
Organization: WestNet
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In article <[e-mail]>, [e-mail]
(Gary Coffman) wrote:

> In article <54em53$[e-mail]> [e-mail] (W8JI  Tom)
writes:
> >While many of Measures' suggestions are harmless, some are not. Some
> >suggestions will put the user in harm's way, or cause equipment damage.
> >I'd hate to see someone ruin a $500 tube, or worse yet hurt themselves,
> >following poor advice.
>
> Well, don't leave us in the dark. Which suggestions are dangerous?
>
Good question, Gary.

Obviously,  electrocution of owner, caused by owner forgetting to unplug
the amp.,prior to owner putting hands therein,  could be classified as a
danger---but so could using a curling iron in a bathtub.

Accusations without a foundation are spurious emissions, Tom.    I would
like to hear the details about ruining $500 tubes, and details about
equipment damage.

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Thu Nov 07 21:14:44 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 30 Oct 1996 12:50:26 -0500
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Hi Zak,

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

>Being a "single frequency area problem", what do you think about using
>inductive resistors in a clever design?

That's allready being done, in the AL1200 and some commercial
applications. Because the 3CX1200A7 is so difficult to stabilize, a small
series silver mica is used to tune a inductive resistor to resonance at
the parasitic frequency.

The circuit looks basically like this:
                 L
anode -----((((((-------------------------][-----plate tune cap
            ^                ^
            ^ --][--WW--^
                C     R

L is a small inductance in series with the anode to tank path, C is the
cap that resonates the resistor path, and R is an INDUCTIVE metal film
resistor.

If you model this or do it long hand you'll see the current will shift
very rapidly into the resistor when L in combination with C approaches
parallel resonance, and R's inductance in combination with C approaches
series resonance.

This gives excellent suppression with minimum dissipation on the operating
frequency. (Patent was applied for, I need to check to see if it was ever
granted yet)

>While not everyone has
>a network analyer for alignment, why not use an antenna analyzer
>as an inexpensive adjustment guide?

The MFJ analyzer works well for some applications like this because it
covers the normal range HF tubes oscillate at, 20-150 MHz. The anode
impedance, when the suppression circuit is properly designed, is even
within the useful impedance range of the device. It would be a long post
to tell someone how to use it in multiple applications, however.

BTW, ferrite beads would not need to be in the dc anode current path.
Saturation Rick L. brought up would still be a concern, especially on ten
meters where the output capacitance of the tube is the primary source of
tank input capacitance. The fact the anode capaciatnce is part of the tank
places ANY component or wiring between the tube and the tank in the path
of high circulating currents at the operating frequency. Any additional
loss at the operating frequency de-Q's the tank and reduces harmonic
suppression, and the high VAR currents tend to cause stress on the
components. I sure would stick anything dissipative at the operating
frequency (including a ferrite bead) in that path, except as a last
resort.

Great thinking and suggestions from you Zak and Rick L !!

73 Tom


From [e-mail] Thu Nov 07 21:14:45 1996
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From: [e-mail] (R. L. Measures )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 30 Oct 1996 12:24:43 -0700
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In article <[e-mail]>, Zack Lau <[e-mail]> wrote:

> W8JI Tom wrote:
>
> > Myself also. If you cut open the film resistors that come with the
> > nichrome suppression kit, you will see the resistor element is wound in a
> > spiral around a ceramic form. This is the last thing you want in a
> > non-resonant VHF suppressor, because it adds series non-dissipative
> > inductance in the resistor path and forces the resistor OUT of the circuit
> > at higher frequencies, right where it is needed most. What a PA really
> > needs are the types of resistors you mentioned, carbon compositions or
> > Carborundum type non-inductive resistors.
.
>         How about using ferrite beads over wires instead of resistors?
> I've heard reports that they are almost purely resistive at VHF. Shouldn't
> the HF bypass choke keep the beads out of saturation if the system is
> properly designed?
>
>         Or, stepping a little further back, how about a distributed
> design solution, perhaps with an integrated transmission line to reduce
> the unwanted parasitic elements?  After all, you do have to shield the
> amplifier anyway--why not integrate the shielding with the circuitry,
> instead of trying to make it invisible?
>
RE: Shielding:
 Spurious radiation is not the problem.  The most common type of vhf
oscillation in HF amps. is not continuous, Zack.  It is intermittent
because there is virtually no resistive load--i.e., something has got to
give, and often does.  Here's why: With virtually no load, the vhf energy
runs amok in the front end of the HF tank circuit, typiclly resulting in
arcing at the tune capacitor,   and/or the 10m and 15m contacts on the
bandswitch.  If they exist, as is the case in the 922, include the tune
capacitor-fixed padder contacts for 80m and 160m.    Since the amount of
vhf energy probably exceeds 1kw in large amplifiers, destruction can
result.  For a picture of the nauseating details see *QST*, Sept. 1990,
page 33.  Another example can be seen in Figure 12 at
http://www.vcnet.com/measures

The voltages that can result from an intermittent vhf oscillation are
impressive.  For instance the TL-922 uses a tuning capacitor that tests
out at well over 5000vdc.  The max. RF peak voltage across this capacitor
is normally around 2700v with the electric-mains supplying 240v to the
922.  Other manufacturers of similar amplifiers typically use a tune
capacitor with only 60% of the air gap in the 922's tune capacitor, so the
safety factor is awesome.  However, when the 922 oscillates at 140 MHz,
the tune cap. can arc.  If you are lucky enough to see this happen, the
arc is purple---a strong indicator that vhf voltage is present.

 W1AW had a TL-922 that arced it's tuning capacitor so much that some of
the plates melted.  The tuning capacitor was replaced.  Parasitic
Suppressor Retrofit Kit s/n 293 (5/23/89) was reportedly installed.  No
complants yet.  Any comments would be appreciated, Tom.
------------------------
e-mail copy to Mr. Lau

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Thu Nov 07 21:14:49 1996
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From: [e-mail]@smtp-news2.ibm.net
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: 30 Oct 1996 19:52:37 GMT
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In <557aht$[e-mail]>, [e-mail]-stutt
gart.de () writes:
>In article <[e-mail]>,
>Dick Hughes <[e-mail]> wrote:
>>In general, the correct length of coax for an HF antenna is the
>>distance it takes to get from the transmitter to the antenna.  Don't
>>worry about length.
>
>Please do not disregard situations where the line can be used for
>matching. Take a quad loop, with 100 Ohms input impedance.
>A quaterwave of 75 Ohms line, with a few coiled turns for a balun
>will save you an antenna tuner. And there a other situations
>where matching is simplified (less losses) when using a defined
>length of line for tranformation.
>
>73, Moritz DL5UH
>
>


    Excellent example here. I fed a triband quad with this method for several
years.
It was the only way I could get a GEM Quad to play with a single 50 ohm coax t
o
three tuned 75 ohm quarter wave stubs.
                                                                         Jim W
D9AHF

OS/2 Warp V4  Java Enabled Operating System.


From [e-mail] Thu Nov 07 21:14:50 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, 30 Oct 1996 13:33:56 -0700
Organization: Internet Access of Ventura County
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> W8JI Tom wrote:
>
> > ... If you cut open the film resistors that come with the
> > nichrome suppression kit, you will see the resistor element is wound in a
> > spiral around a ceramic form. This is the last thing you want in a
> > non-resonant VHF suppressor, ... ...

OK, Tom, a quick quiz.  What is the inductance of the film resistors we
use in our  parasitic suppressor retrofit kits?   BTW, Tom, you can not
find out anything by cutting one of these resistors.  Scraping the blue
coating off is the technique that works.

Straight one-inch copper tubing has more inductance than most hams
realize.  It takes surprizing little of it to make 100nH.

Carborundum "non-inductive" resistors are no less inductive than a piece
of copper tubing of the same length and diameter.   The typical
"non-inductive" Carborundum resistor has approximately the same inductance
that is required for the suppressor inductor.  Thus, if you put such a
resistor in parallel with a typical 70nH suppressor inductor, you loose
the essential stagger-tuning effect that lowers the Q of the parasitic
suppressor.  .

--
--Rich-- ag6k, 805.386.3734


From [e-mail] Thu Nov 07 21:14:51 1996
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From: Stephen Dobak <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: (no subject)
Date: Wed, 30 Oct 1996 20:11:03 -0500
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add ham-hombrew


From [e-mail] Thu Nov 07 21:14:52 1996
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From: [e-mail] (PBUNN624)
Newsgroups: rec.radio.amateur.homebrew
Subject: Eimac 4CX250B tueb and SK620 socket FS
Date: 30 Oct 1996 22:09:00 -0500
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I have a new in the box Eimac 4CX250B and SK620 socket for sale.

Price $90 including shipping

Email [e-mail]


From [e-mail] Thu Nov 07 21:14:53 1996
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From: [e-mail] (PBUNN624)
Newsgroups: rec.radio.amateur.homebrew
Subject: New Old Stock Hammarlund HF 15 Variable Caps
Date: 30 Oct 1996 22:16:24 -0500
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Ceramic panel mount variable capacitors, 4-17pF, Nickle plated brass
These make great variable caps for VFO's. They are single bearing but beat
the aluminum palte variables for stability. Surplus Sales of Nebraska had
these in their catalog for $20 each!

$4.50 each or 10 for $35

I also have some 2 1/2 " vernier dials marked 0-100. They are available at
$6
each and quantity is limited.

Email  to 624 Kits:

[e-mail]


From [e-mail] Thu Nov 07 21:14:53 1996
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From: [e-mail] (PBUNN624)
Newsgroups: rec.radio.amateur.homebrew
Subject: QRP Calling Frequency CRYSTALS
Date: 30 Oct 1996 22:18:15 -0500
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Crystals   HC18 Case , solder leads

7040 Khz, 10106 Khz, 14060KHZ     Brand New!

Super Special priced!!       $3.50 each or 3 for $10 postpaid

Email 624 Kits:

[e-mail]


From [e-mail] Thu Nov 07 21:14:57 1996
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From: [e-mail] (Winfield Hill)
Newsgroups: sci.electronics.design,sci.electronics.misc,rec,rec.radio.swap,rec.radio.amateur.homebrew
Subject: Re: What is the maximum gain that you can get out of a transistor?
Date: 31 Oct 1996 03:34:59 GMT
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Gary Coffman,  <[e-mail]> said...
>
> [e-mail] (Winfield Hill) writes:
>>Charles Wenzel,  <[e-mail]> said...
>>>
>>> A really crude but often effective estimate of a bipolar transistor's
>>> voltage gain is simply 38 times the voltage across the collector resistor.
>>> The beta of the transistor mainly affects the input impedance ....
>>
>> Good for Charles.  After watching the off-base answers on this thread for a

>> while, I wondered if anybody was going to come up with the straight-forward

>> answer!
>
> Always nice to hear from the master, however is this really the straight
> forward answer we're looking for?  A transformer can offer voltage "gain".

Hey Gary, give me a break!  Remember, I only chimed in with the (gory) details

after waiting a few days and seeing their absence.  Didn't you think it useful
?
Anyway, with an attractive lob like that, who could resist a smash return?

Of course adding a transformer would change the whole story!  Surely you can
see most of us on the thread assumed voltage rather than power gain was the
question (although no detail was stated), and that it was "transistor only."
After all, as you said, with a transformer, you can get voltage gain, without
any transistor at all!  No load defined?  Near infinite turns ratio - tuned?
Consider the arguments and flames that would produce.  So without detailed
limits it becomes a senseless question.

> What separates an active device like a transistor from a passive device
> like a transformer is the possibility of *power gain*.  Given a power
> gain, we can easily make practically any voltage we like with a step up
> transformer in the drain circuit.

Exactly, Gary.  Isn't that a question without a real answer?  Hey, create a ne
w
thread: "What's the maximum power gain from one transistor?"  But, I'll
probably stay out of that mudpit!

As for me, despite my well-known love of transformer design, somehow I can't
appreciate your transformer form of the question.  Instead, the idea of
considering the capabilities of a few small inexpensive components (rules out
a
transformer)... now, that's more compelling.

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



From [e-mail] Thu Nov 07 21:14:58 1996
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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: 31 Oct 1996 03:44:29 GMT
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J M Woodgate,  <[e-mail]> said...
>
>The maximum gain you can get depends on what circuit configurations you
>allow. If you allow positive feedback, the answer is 'infinite'. Then again,
>how many 'non-ideal' properties will you take into account? Finite output
>resistance is easily allowed for, then comes internal c-b feedback
>resistance, then capacitances.

I'd guess anything goes, if it involves just simple R C and real (bipolar)
transistors.  And, I'd imagine it rules out oscillators.  Now, controlled
positive feedback: Hmmmm.  Is there a one-transistor (no transformer) circuit
configuration for this?

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



From [e-mail] Thu Nov 07 21:14:59 1996
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From: DAN <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Wed, 30 Oct 1996 20:14:44 -0800
Organization: InfiNet
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Gary Coffman wrote:
>
> In article <54em53$[e-mail]> [e-mail] (W8JI  Tom) wr
ites:
> >While many of Measures' suggestions are harmless, some are not. Some
> >suggestions will put the user in harm's way, or cause equipment damage.
> >I'd hate to see someone ruin a $500 tube, or worse yet hurt themselves,
> >following poor advice.
>
> Well, don't leave us in the dark. Which suggestions are dangerous?
>
> Gary
> --
> Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
> Destructive Testing Systems |    we break it.     | with previous uucp addre
sses
> 534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
> Lawrenceville, GA 30244     |                     |

I've been reading Mr. Measures' articles for years (along with the responses f
rom some
of the ARRL people and the manufacturing engineers).

After careful study, I've developed a profound respect for Mr. Measures' techn
ical
knowledge and his objectivity in reasoning.  While some of his "critics" are
knowledgeable in certain areas, they usually get off-track, get lost in their
own
arguments, or end up throwing smoke.  Some of their responses have been so obv
iously
biased or technically inept, they must surely be embarassed when they see thei
r comments
in print.

One example of "smoke" was the safety issue.  One of Mr. Measures' suggestions
 for
keying an amplfier would have resulted in 110 volts on the "keying" line to th
e
amplifier (a circuit that I use, by the way).  Anyone who can't handle the saf
ety issues
involved in a low-current 120 volt line shouldn't be fooling with linear ampli
fiers.
The gist of Mr. Measures' article that contained the keying suggestion was a s
imple,
cheap way to achieve QSK.  Lacking a better idea (they had idea's, but not sim
ple or
cheap or better), they felt compelled to "take a shot" with this lame safety a
rgument.

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 m
ember.

Dan - AD4HW


From [e-mail] Thu Nov 07 21:15:01 1996
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From: [e-mail] (Jeff Johnson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low dropout regulator info needed
Date: 31 Oct 1996 04:37:13 GMT
Organization: Internet Interstate - Metropolitian Washington, DC -*- 301.652.IINT
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Uncle ([e-mail]) wrote:
: On Mon, 28 Oct 1996 17:35:42 GMT, [e-mail] (Doug
: Faunt N6TQS [phone]) wrote:

: +I need to provide 10.6v at 1.6A from a 12V lead-acid battery.
: +Any hints on low-dropout regulators for this application?
: +Regulation doesn't have to be great.
: +
: +73, doug

: Won't ask what 10.6v is needed for, but is the 1.6A
: fairly constant?  To keep it simple, I'd be happy just
: to use a simple TO-3 case pass transistor, adjust
: your base voltage according to the drop across a small
: series resistance, or even a stack of zeners totalling
: approx 10.6 volts to the base.  For mere 1.6A, might
: even get away w/o using a sink.

: Refer ARRL handbook for basics regarding.


Well, that sounds more noise than signal.  Check the
Data sheets for National Semiconductor, Maxim,
and Linear Tech.  They all have a good collection of
LDO (low drop-out) regulators.  You can browse National's
data book on line.  Here is the exact location of
positive LDO's:
http://www.national.com/catalog/660.html

-- Andy
   Email me at: [e-mail]




: Uncle Brian  VK6BQN

:     -    -    -    -
: Life isn't meaningless, it just has a poor signal to noise ratio.

--
Jeff Johnson    ARS N3NPQ
[e-mail]
Bethesda, MD


From [e-mail] Thu Nov 07 21:15:01 1996
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From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 30 Oct 1996 23:41:04 -0500
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Thanks Tom,  for the explanation helping me understand
them ol' tubes a little more.

The title of this thread should read "Tom is the source for amplifier
tips"

at's a right!

Carl



From [e-mail] Thu Nov 07 21:15:03 1996
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From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Problems making PCBs
Date: 30 Oct 1996 23:41:07 -0500
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In article <[e-mail]>, [e-mail] (Lars
Moell) writes:

>Hi
>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:
>
>

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] Thu Nov 07 21:15:03 1996
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From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tom, W8JI, is the source for amplifier tips.
Date: 30 Oct 1996 23:41:07 -0500
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Thanks Tom, for the explanation. It helped me
understand them ol' tubes a little more.

Carl


From [e-mail] Thu Nov 07 21:15:04 1996
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From: [e-mail] (Chris Victor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Greetings Fellow 4-1000 HF Amp builders,
Date: Thu, 31 Oct 96 05:15:28 GMT
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        Greetings Fellow HF Amp builders,

Many years ago I have seen designs with for a  4-1000 amp with a Zener diode
(50 Watt) in the center tap of the fil xfmr to ground.

Is this to provide a good biasing scheme for SSB operation?? or just a easy
way to cut-off the tube during no xmt modes and in xmt modes w/no modulation?

Many thanks for any/all responses.

de Chris WA6SUY


From [e-mail] Thu Nov 07 21:15:06 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
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In article <557p58$[e-mail]>
[e-mail] (Winfield Hill) wrote:
>
> If this thread had serious attendance by semiconductor device engineers (whi
ch
> 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. Hills 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.
Assume the collectors are held at some voltage within their linear
range by a device with an infinite input resistance.
The voltage gain can be expressed as gm*R where gm = Ic/Vt,
and R is the resistance at the collector node.  In the
case of assumed infinite load resistance, the resistance on
the node is the parallel combination of ro from the NPN
(output resistance of the current source) and the ro of the
PNP common emitter, (the output impedance of the gain device)
ro NPN = VaNPN/Ic and roPNP = VaPNP/Ic.  Doing the math I conclude
that the total output resitance on the collector node is 18.18v/Ic.  Now
multiply that by gm, Ic/vt and you get (18.18/Ic) *(Ic/vt) or 18.18/Vt,
about 700v/v (assume all numbers are valid at 25C).  If
some cascoding or degeneration techniques were utilized to
increase the
output resistance of the current source, the total output
resistance would approach
20v/Ic, or simply VaPNP/Ic.  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.

EM









From [e-mail] Thu Nov 07 21:15:07 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 31 Oct 1996 01:45:38 -0500
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In article <[e-mail]>,
[e-mail] (R.L. Measures) writes:

>Accusations without a foundation are spurious emissions, Tom.    I would
>like to hear the details about ruining $500 tubes, and details about
>equipment damage.

I can give a few specific examples, but I'm sure this would quickly turn
from a technical discussion to personal "bashings". I would prefer to talk
about the cause of problems, and the cures, rather that specific examples.

Since there are several suggestions that might cause damage or reduce
reliability, and some are fairly involved they deserve to be discussed in
isolated responses. Discussions are always clearer when they are point by
point. Givin enough time, we'll get to the areas of concern. With that in
mind:

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

>RE: Shielding:
> Spurious radiation is not the problem.  The most common type of vhf
>oscillation in HF amps. is not continuous, Zack.  It is intermittent
>because there is virtually no resistive load--i.e., something has got to
>give, and often does.

Oscillators do not work that way Rich. If the feedback loss (including
less than ideal phase shift) is less than the overall gain, a system will
oscillate. Let's look at a typical GG triode. The primary path for
oscillation if via the anode to grid capacitance (remember anode to
cathode feedback is degenerative. It reduces gain and helps stabilize the
PA).

At some frequency above the typical operating frequency of the tube, the
combination of shunt grid capacitance and series grid inductance forms a
parallel tuned circuit. The inductance is made up of the grid, the grid
leads, the socket, and the connection from the socket to chassis. Shorter
and wider leads, along with a small grid, increases this frequency.

If the anode of the tube (inside the tube) has a high impedance at or near
the same frequency as grid resonance, and if feedback capacitance is high
enough, oscillation can occur.

We have to understand what sets the gain of this oscillator. It is the
anode impedance,  (as it appears inside the tube), and the grid impedance.
When the tube is sitting at idle, drawing minimum anode current (but in
conduction) the anode impedance is highest. The same is true for the grid.

The grid has an extremely high impedance when it isn't drawing current,
limited only by stray losses. If the grid draws current, the grid
impedance drops very rapidly. If anode current increases, anode impedance
drops (less abruptly than the grid, because it is biuased into current at
idle).

When these impedances drop, feedback is reduced. This is one reason why
oscillators stabilize at one level.

So you see, it isn't that the stage just sits there waiting minutes,
hours, days or years to suddenly oscillate when a big peak comes along,
because that big peak actually reduces the gain!

You can see this effect easily by removing suppression and forcing the PA
to oscillate. If a PA is brought just beyond the edge of stability, VHF
oscillations will cease when drive is applied.

> Here's why: With virtually no load, the vhf energy
>runs amok in the front end of the HF tank circuit, typiclly resulting in
>arcing at the tune capacitor,   and/or the 10m and 15m contacts on the
>bandswitch.

Let's think a little bit about this. The VHF impedance of the plate tuning
cap is very low. It is on the other side of the series inductance of the
anode to tank lead. In order to generate VHF voltages of thousands of
volts, many amperes of VHF current would have to flow. I find it a far
stretch to imagine that occuring to the extent 5 kilovolts of VHF energy
appears acorss the low reactance of the tank capacitor, when you tell us
it can't occur at HF where the series impedance is lower and the shunt
impedance higher!

> If they exist, as is the case in the 922, include the tune
>capacitor-fixed padder contacts for 80m and 160m.

I find it even more difficult to believe the padding capacitors for 160
will arc from VHF signals. Tell me the value of those caps, and let's run
some numbers to see how plausible that postulation really is.

>The voltages that can result from an intermittent vhf oscillation are
>impressive.  For instance the TL-922 uses a tuning capacitor that tests
>out at well over 5000vdc.  The max. RF peak voltage across this capacitor
>is normally around 2700v with the electric-mains supplying 240v to the
>922.  Other manufacturers of similar amplifiers typically use a tune
>capacitor with only 60% of the air gap in the 922's tune capacitor, so
the
>safety factor is awesome.  However, when the 922 oscillates at 140 MHz,
>the tune cap. can arc.  If you are lucky enough to see this happen, the
>arc is purple---a strong indicator that vhf voltage is present.

An HF air gap arc is the same color as a VHF arc Rich. You might be
confusing this with neon gas, it changes color with frequency being yellow
or orange at low frequencies and purple at higher frequencies.

73 Tom


From [e-mail] Thu Nov 07 21:15:08 1996
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!metro.atlanta.com!cpk-news-feed3.bbnplanet.com!cpk-news-hub1.bbnplanet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newsstand.cit.cornell.edu!news.acsu.buffalo.edu!acsu.buffalo.edu!tumino
From: [e-mail] (Thomas N Tumino)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Motorola ht210 conversion
Date: 31 Oct 1996 07:10:07 GMT
Organization: University at Buffalo
Lines: 11
Message-ID: <559jcf$[e-mail]>
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Xref: news1.epix.net rec.radio.amateur.homebrew:20629 rec.radio.amateur.equipment:41458

HEllo there!

I just got ahold of some motorola ht210s and was wondering if anyone had
any experience bringing these radios into the ham band?

If you have any info about these radios or how to do the conversion,
please post and e-mail me

Thanks in advance!

Thomas N2YTF


From [e-mail] Thu Nov 07 21:15:09 1996
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From: [e-mail] (Bry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Needed: Jones connector
Date: Thu, 31 Oct 1996 10:14:31 GMT
Organization: MEGALIST www.mnsinc.com/bry/
Lines: 19
Distribution: inet
Message-ID: <55a51b$[e-mail]>
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Hello guys:
I need a 12 pin Cinch-Jones connecter FEMALE, Cable end.
This is the P.S. connector used on the old WRL DUO-BANDER 84 rig I have
acquired.

Any leads would be appreciated. I have a bunch of other old BA parts I could
trade for it or whatever.

Any help or leads would be appreciated.

Please e-mail me at  [e-mail]

73 de Bry - G3XLQ / W4  &  AF4K

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] Thu Nov 07 21:15:10 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, 31 Oct 1996 03:35:46 -0700
Organization: WestNet
Lines: 35
Message-ID: <[e-mail]>
References: <555qnt$[e-mail]> <557scp$[e-mail]>
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In article <557scp$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> To
> give you an idea how quickly a tube like that can be ruined, I wasted a
> 3CX800 in abouta matter of seconds when I was prototyping a 3CX800 PA. I
> hadn't installed the grid trip circuit yet, and was doing some tank
> changes. After three or four SHORT hits with a 100-150 mA of grid current,
> the tubes were history. When I cut one open, the gold was boiled off the
> grid.

The idea that the 3CX800A7 grid structure could be elevated to over 2000
degrees F by 150mA of grid current is not logical.  150mA times the voltage
present is simply not going to make enough power to bring the grid up to
gold-boiling temperature, .Tom.    Did you ever wonder why the grid itself
did not show indications of exposure to high temperature?  The most likely
answer is that the surface of the gold plating was heated and the
underlying metal was not.  This is what Eimac told me.

Have you ever heard of skin-effect?  Do you realize how hot 2000 degrees
is?  At such temperatures, things don't just turn red, they glow bright
yellow.   Some ceramic glazes are fired at 2000 degrees.  I once put some
stainless steel wire through the peep hole in my ceramics kiln to see what
would happen.  It disintegrated.

Stephan's Law says the amount of energy required to increase the
temperature of a radiating object is T^4.  It might be fun to measure the
mass of a  3CX800A7 grid, and calculate how much power would be needed to
raise that mass to 2000 degrees.
---------------------------
e-mail copy to Mr. Rauch

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Thu Nov 07 21:15:11 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news1.epix.net!news4.epix.net!news.sprintlink.net!news-pen-14.sprintlink.net!cs.utexas.edu!howland.erols.net!feed1.news.erols.com!news.bconnex.net!news.lightlink.com!mv!wd1v.mv.com!user
From: [e-mail] (John D. Seney, WD1V,   LeCroy T&M   800.553.2769)
Subject: Oscilloscope.FAQ
Message-ID: <[e-mail]>
Organization: MV Communications, Inc.
Date: Thu, 31 Oct 1996 11:59:05 GMT
X-Nntp-Posting-Host: wd1v.mv.com
Lines: 7

Its on my home page or send me an Email that has "SUBSCRIBE"
on the subject line.

Best regards,

John D. Seney
http://www.mv.com/ipusers/wd1v


From [e-mail] Thu Nov 07 21:15:13 1996
Newsgroups: rec,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.design,sci.electronics.misc
Path: news1.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!mr.net!nntp.earthlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!eskimo!news
From: [e-mail] (Bill Turner)
Subject: Re: What is the maximum gain that you can get out of a transist
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Xref: news1.epix.net rec.radio.amateur.homebrew:20655 rec.radio.swap:93322 sci.electronics.design:24391 sci.electronics.misc:16673

Charles Wenzel <[e-mail]> wrote:

>[e-mail] wrote:
>
><<much clipped>>
>>
>> Actually, you can get a gain of 100,000, not that it will be good for much.
 No
>> emitter resistor and a 1 meg collector resistor. As soon as you pass the
>> Base-Emitter thresh hold the 1 meg will saturate. Useless, but a demonstrat
ion.
>
>Where did you get those 3000 volt transistors? If the circuit is biased to ge
t 5
>volts across the 1 meg. the gain will be near 200. And the circuit IS useful
for
>driving a crystal earphone from a crystal radio source. 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.
The gain will be so high it will be very difficult to bias correctly and
therefore pretty near useless but it will be quite a demonstration of the
principle.

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 esentially
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 the
collector current varies by 1 milliamp and the load resistor is 1000 ohms, the
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
the designer needs to do is set the base bias so that the no-signal DC voltage
drop across the resistor is correct in each case - normally 1/2 of the
collector supply voltage.  And of coure, the voltage variation has to be less
than the amount of the DC supply.  If you have a 15 volt supply, the voltage
can only swing from approximately 0 to 15 volts.  (Ok, there are exceptions to
this if you have a parallel-resonant circuit in the collector, but that's a
whole 'nother thread).  The actual current gain of a particular transistor
changes somewhat with bias changes, so in the instance above, the ratio of
gains wouldn't be exactly 10 to 1, but it'd be pretty close.  Set up a simple
circuit on your bench and play with it.  You'll have fun and learn a lot, I
guarantee!

73, Bill W7LZP
[e-mail]


From [e-mail] Thu Nov 07 21:15:14 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!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!uknet!newsfeed.ed.ac.uk!leeds.ac.uk!news
From: [e-mail] (L. DE BRUIJN)
Subject: Homebrew:'Sprat'  80M xcvr data?
Keywords: sprat
Message-ID: <55aag8$[e-mail]>
NNTP-Posting-Host: ingold_pc78.leeds.ac.uk
Summary: none
Organization: University of Leeds
Date: Thu, 31 Oct 1996 13:44:12 +0000 (GMT)
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I'm looking for the schematics / design details for the G-QRP club's Sprat
xcvr. I've got most of the schematics but I don't know how to connect some of
the KANK coils (which pins) and it is not mentioned in the article. The thing
is based on a MC3362 and I need the tank circuit details for running the vco
at 8MHz, as well as the preselector KANK info. TIA

                        73 de Laurens


From [e-mail] Thu Nov 07 21:15:15 1996
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From: "Jeff Andle" <[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: 31 Oct 1996 14:17:25 GMT
Organization: Agate Internet Services (AIS)
Lines: 40
Message-ID: <01bbc736$370f6da0$313075cc@enterprise>
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Winfield Hill <[e-mail]> wrote in article
<5597at$[e-mail]>...
> J M Woodgate,  <[e-mail]> said...
> >
> >The maximum gain you can get depends on what circuit configurations you
> >allow. If you allow positive feedback, the answer is 'infinite'. Then
again,
> >how many 'non-ideal' properties will you take into account? Finite
output
> >resistance is easily allowed for, then comes internal c-b feedback
> >resistance, then capacitances.
>
> I'd guess anything goes, if it involves just simple R C and real
(bipolar)
> transistors.  And, I'd imagine it rules out oscillators.  Now, controlled

> positive feedback: Hmmmm.  Is there a one-transistor (no transformer)
circuit
> configuration for this?
>
does a superregenerative receiver count?  I forget if it has a transformer
or not, but that is a circuit that doesn't oscillate without an input
signal,
yet provides tremendous output signal - to input signal ratio.

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

--
Jeff Andle  <[e-mail]>
"To each according to his ability, From each accordint to his needs."
     -  Ayn Rand's rebuttal to Karl Marx





From [e-mail] Thu Nov 07 21:15:16 1996
Path: news1.epix.net!news3.epix.net!uunet!in1.uu.net!feed1.news.erols.com!arclight.uoregon.edu!enews.sgi.com!news.sgi.com!news.tamu.edu!news.utdallas.edu!nrchh45.rich.nt.com!bcarh189.bnr.ca!bmerhc5e.bnr.ca!news
From: kirkland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Problems making PCBs
Date: Thu, 31 Oct 1996 10:07:54 -0500
Organization: Nortel
Lines: 26
Message-ID: <[e-mail]>
References: <[e-mail]> <559al3$[e-mail]>
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I have heard of people using Vellum (i.e. translucent drafting paper,
it feels kind of like a plastic).

I have also heard of/and tried using several transparencies one
of top of each other to get the necessary darkness.

One thing to remember is that just because you can see through the
transparency doesn't mean that the UV rays will pass through it very
well.

Also make sure that the toner side of the image is face down on the
resist.


You can also take your art work to a print shop and have them make
a line print (a high contrast black and white print).  You might be
able to do this yourself by exposing your transparency onto ortholithic
film (Kodak makes this - available at a good Black and White
camera/print shop).  Ortholithic film is a high contrast black and white
film - this may help compensate for the low contrast transparency.
You will need the special developer that goes with the film.  The film
is easy to work with as it is safe to use under the standard
yellow/orange B&W safelight.

Bill Kirkland
VE3JHU


From [e-mail] Thu Nov 07 21:15:17 1996
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From: [e-mail] (R.L. Measures)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: Thu, 31 Oct 1996 09:03:44 -0700
Organization: WestNet
Lines: 39
Message-ID: <[e-mail]>
References: <[e-mail]> <559hui$[e-mail]>
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In article <559hui$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In article <[e-mail]>,
> [e-mail] (R.L. Measures) writes:
>
> >Accusations without a foundation are spurious emissions, Tom.    I would
> >like to hear the details about ruining $500 tubes, and details about
> >equipment damage.
>
> I can give a few specific examples, but I'm sure this would quickly turn
> from a technical discussion to personal "bashings".
snip...
ÇÇááTry me.   ÇÇ

> > If they exist, as is the case in the 922, include the tune
> >capacitor-fixed padder contacts for 80m and 160m.
>
> I find it even more difficult to believe the padding capacitors for 160
> will arc from VHF signals. Tell me the value of those caps, and let's run
> some numbers to see how plausible that postulation really is.

Tom:   The term "capacitor-fixed"  should have been "fixed-capacitor".
Sorry for the typo. It should have read:

>>With virtually no load, the vhf energy
>>runs amok in the front end of the HF tank circuit, typiclly resulting in
>>arcing at the tune capacitor,   and/or the 10m and 15m contacts on the
>>bandswitch.  If they exist, as is the case in the 922, include the tune
>>fixed-capacitor padder contacts for 80m and 160m.

Question:  Am I talking about arcing the fixed-capacitors or arcing the
contacts?
--------------------------
e-mail copy to Mr. Rauch

--
--Rich--
ag6k, 805.386.3734


From [e-mail] Thu Nov 07 21:15:18 1996
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From: [e-mail] (Lars Moell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Problems making PCBs
Date: Thu, 31 Oct 1996 16:20:53 GMT
Organization: National Defence Research Establishment, Sweden
Lines: 43
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References: <[e-mail]> <[e-mail]>
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[e-mail] (Gary Coffman) wrote:

Aha
Interesting to know! I have usede the 3M PP2500 especially for copiers
and did not realise there was a special for lasers!  If I take a
"clear" PP2500 and put that on a P20 PCB and expose in UV-light I
clearly can see where the film has been located after a thorough
developement.

Would be very nice to hear form someone that tried to use ink-jet and
clear transparencies. (Might try it myselfe if have the spare time)
Must see if I can locate this special transparencies for lasers too.

Have tried a color-copier but with even worse result!

There must be an easy way!
Please tell us your experience....
73 Lasse SM5GLC
>
>I use the Avery brand laser transparencies. These are different
>from the transparencies sold for copiers and seem to work better.
>I'm told copiers are hotter, and require a different transparency
>material. If you use copier transparencies in a laser printer,
>you don't get as good a fusion of toner to the transparency.
>
>I friend of mine just showed me a transparency he did on an Epson
>Stylus inkjet printer. Looked really good. This may be a better
>way to go. Note, inkjets need a special transparency material
>or the ink will smear like crazy. The side the ink goes on has
>a slightly rough feel.
>
>I hope this doesn't need to be said, but of course you need to
>print the transparency with a mirror image of the layout and
>expose with the ink side toward the board. Otherwise you'll
>get undercutting of the resist.
>
>Gary
>--
>Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
>Destructive Testing Systems |    we break it.     | with previous uucp addres
ses
>534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
>Lawrenceville, GA 30244     |                     |



From [e-mail] Thu Nov 07 21:15:19 1996
Path: news1.epix.net!news3.epix.net!uunet!in3.uu.net!feed1.news.erols.com!news
From: "Kenneth Carrigan" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Insides of HF tuner MJF-941 or similar
Date: 31 Oct 1996 17:36:36 GMT
Organization: Erol's Internet Services
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Doing some plasma experiments with 28 MHz ISM band
and would like to know what components are needed
to match 50ohm linear to plasma unit.  Would an MRF-941
unit do it?  Is this just a T network with one adjustable
inductor (coil) and two caps?

What is the tuning impedance range at the antenna port
with a 50 ohm signal input?  .1 to 1000 ohms?

Thanks Ken


From [e-mail] Thu Nov 07 21:15:20 1996
Path: news1.epix.net!news4.epix.net!cdc2.cdc.net!news.texas.net!news.sprintlink.net!news-fw-6.sprintlink.net!cs.utexas.edu!howland.erols.net!vixen.cso.uiuc.edu!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 31 Oct 96 17:50:46 GMT
Organization: ucsd usenet gateway
Lines: 33
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

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] Thu Nov 07 21:15:21 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: Good source for amplifier tips
Date: Thu, 31 Oct 1996 11:52:10 -0600
Organization: Madison Materials Company
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]> <5549of$[e-mail]>
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>>>While many of Measures' suggestions are harmless, some are not. Some
>suggestions will put the user in harm's way, or cause equipment damage.
>I'd hate to see someone ruin a $500 tube, or worse yet hurt themselves,
>following poor advice.
>
>73, Tom<<



OK, Tom.  Like the old E F Hutton commercials.....you've got us all
listening....<g>  Please give us the details!

73

Tom KJ5IE


From [e-mail] Thu Nov 07 21:15:22 1996
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From: [e-mail] (Richard Cone)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Help -> Motorola MT700
Date: Thu, 31 Oct 96 19:32:15 GMT
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Hi,

I wonder if anyone has (or knows where i can get hold of)
technical information for a Motorola MT700 FM handi.

I've got one of these units at present, it cost me a couple
of pounds at a local car boot sale, it seems to be working fine.
TX is 461.625 / RX is 456.125 with a 110.9Hz tone squelch unit.

I'm interested in converting it down onto my local 70cms repeater
freq. (433.325) and would be grateful if anyone can give me
some info.

Cheers,
Richard


From [e-mail] Thu Nov 07 21:15:23 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good source for amplifier tips
Date: 31 Oct 1996 15:17:47 -0500
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Hi Rich,

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

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

>The idea that the 3CX800A7 grid structure could be elevated to over 2000
>degrees F by 150mA of grid current is not logical.  150mA times the
voltage
>present is simply not going to make enough power to bring the grid up to
>gold-boiling temperature

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.

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.

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

I find it remarkable that you expect no damage from this severe an
overload, since even a rugged and thermally massive high temperature anode
located a large distance from the hot cathode wouldn't survive operation
at five times the rated dissipation for more than a few seconds (with an
internal anode tube) or minutes (with an external anode tube).

Heat caused by grid dissipation is concentrated in the very fine grid
mesh. This mesh  has almost no thermal mass, it is designed to be as open
as possible so it doesn't block the cathode to anode path, except by it's
electric field.

Heat is only conducted from the grid via the path through that very low
mass mesh, or via radiation effects.

 It's no surprise the plating disappears first, because normal
deterioration of materials, especially materials that are quickly heated,
occurs from the outer layers first.
Gold has a melting point of 1063 degrees C, and the base material used in
the grid structure has a melting point between 2600 and 3400 degrees C
(depending on the alloy).

I find it difficult to understand why you insist RF skin effect has
something to do with the Gold deterioration, when the outside of the grid
(where the Gold is) gets heated first, heated most, has by far the lowest
melting and boiling point of any material used in the tube.

If that isn't enough, the underlying base material has lower thermal
conductivity, reducing the thermal rise of the inner material. Since the
Gold is directly heated, and thermal conductivity is lower in the
underlying structure, the Gold quite obviously gets hotter and is damaged
far faster than anything else for this reason alone.

I wonder how you justify your theory that only a UHF signal could damage
the Gold,  in light of well documented facts like melting points, thermal
conductivity, and heat conduction?

It's only natural the grid is going to show Gold damage if overdriven from
any cause.

73 Tom


From [e-mail] Thu Nov 07 21:15:24 1996
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From: [e-mail] (Mustang Maniac)
Newsgroups: rec.radio.amateur.boatanchors,rec.radio.amateur.homebrew
Subject: Re: Recieving tubes for transmitting?
Date: 31 Oct 1996 21:39:05 GMT
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In article <[e-mail]>, [e-mail]

says...
>
> Compactrons CAN be very useful:  they are fairly cheap, are the final\
> stage in the development of vacuum tubes, and can do a LOT in one envelope.
> Sockets are available from AES and other places.

I have a compactron in use right now in a transmitter!  I'm using a 6T9 in
a classic 80/40m circuit taken from the 1968 edition of ARRL's How To Be A
Radio Amateur.  I believe this circuit also appeared in the 1972 Handbook.
It runs 4 Watts output on 80m and 40m CW, crystal controlled (of course!).
This is the second variation of this circuit that I've built, and it works
really well.  The 6T9 is a triode/pentode pair in one envelope.  I'm using
the triode as the oscillator and the pentode as the PA.  It's a two-stage
transmitter, but with only one filament to feed, and only one tube socket
to install and wire up.  Give the Compactrons a try!

--
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] Thu Nov 07 21:15:25 1996
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From: [e-mail] (Dave )
Newsgroups: rec.radio.amateur.homebrew
Subject: Icom 706 Software
Date: Thu, 31 Oct 1996 23:16:05 GMT
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Hello,

Does somebody has some software specialy for the Icom 706. I'm looking
for it and tried several places but couldn't find something.
Would be nice to help me out.

73 de Dave   N2XMF


From [e-mail] Thu Nov 07 21:15:28 1996
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From: Lyle Koehler <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Etch-Resist Transfer film
Date: Thu, 31 Oct 1996 18:12:38 -0600
Organization: MEANS
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You can buy a product called TEC-200 film from:

Meadowlake Corp.
P.O. Box 1555
Oneco, FL 34264

The stuff comes in 8.5 by 11 inch sheets. 5 sheets cost $4.95 plus $1.75
postage; 10 sheets for $6.95 plus $2.00 postage; 25 sheets for $16.00
plus $3.00 postage, etc. I just got some and have tried it once. It's
not perfect, but is a lot less messy than ironing on from a paper copy
and dissolving away the paper in Chlorox solution. With practice it
might be possible to turn out some pretty nice PC boards.

Lyle

[e-mail]




From [e-mail] Thu Nov 07 21:15:30 1996
From: [e-mail] (David Covert)
Subject: Homebrew satellite data radio plans wanted
Date: 31 Oct 96 16:18:45 -0800
Message-ID: <[e-mail]>
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Organization: The Microsoft Network (msn.com)
Lines: 16


I would like to work the microsats but do not wish to spend $2000 for
a FT-736.

So, I am looking for plans for a 2m xmitter and a 70cm rcvr pair that are
both microprocessor controlled (for auto dopler compensation) and capable of
9600bd FSK FM (mode JD). I don't care about front panel display or anything.
Kind of a 'microsat data brick'.

Anyone ever seen anything like that?

How about just a PLL controlled pair that I could add a BASIC Stamp
to for uP control.


Dave Covert, KB5GOG


From [e-mail] Thu Nov 07 21:15:31 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Quadrifilar antenna article help
Date: 1 Nov 96 02:06:06 GMT
Organization: ucsd usenet gateway
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

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

Can someone help me with the name and issue of the magazine?
Thanks

Chuck Curtis

amprnet: [e-mail]           internet: [e-mail]
ax25   : n2ucn@wa2soc.#nnj.nj.usa.na     internet: [e-mail]



From [e-mail] Thu Nov 07 21:15:32 1996
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From: johnf <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: power zener
Date: Thu, 31 Oct 1996 18:57:22 -0800
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http://www.why.net/home/3051


From [e-mail] Thu Nov 07 21:15:32 1996
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From: Madjid VE2GMI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Newbie needs info!
Date: Thu, 31 Oct 1996 22:18:28 -0500
Organization: ORION
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Jeremy Craigs wrote:
>
> Could some one send me/point me towards some FAQ's re:radio?
> My main interest is reception at the moment, with transmission
> to come later.
>
> any help would be appreciated.
> [e-mail]
> --
> Jeremy Craigs  [e-mail]
> Ask me no questions, I'll tell you no lies.
>
> And now, for something completely different...

Check these pages:

http://www.rac.ca/                      Radio amateurs of Canada

http://www.cam.org/~dino/ham.html       Dino super super page

Madjid VE2GMI


From [e-mail] Thu Nov 07 21:15:33 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Aerial tuner circuit for FM requested
Date: Fri, 01 Nov 96 04:25:36 GMT
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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] Thu Nov 07 21:15:34 1996
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From: Richard Valentine <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Can a Panadaptor be modified?
Date: Thu, 31 Oct 1996 23:37:10 -0500
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Can anyone offer a way to modify a 455Kc IF Panadaptor to work with an
FT-1000?  The FT's IF output is 73.62 MHz.  I'd be willing to pay for a
conversion. -- N1SQJ