World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1995_06/_homebre.txt

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The World of Ham Radio CD-ROM


From [e-mail] Wed 07 Jun 95 15:58:49
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From: [e-mail] (Jeffrey W. Lawson)
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: BA1404
Date: 7 Jun 1995 17:46:04 GMT
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Xref: grape.epix.net rec.radio.amateur.antenna:10908 rec.radio.amateur.digital.misc:8793 rec.radio.amateur.equipment:12908 rec.radio.amateur.homebrew:7677 rec.radio.amateur.misc:80333


                I have 1000 BA1404 stereo transmitter chips. If your
        interested, I'm at [e-mail]

        p.s. All sells include full data sheets


From [e-mail] Wed 07 Jun 95 15:58:50
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Component Values for Parasitic Suppressors?
Date: Tue, 06 Jun 95 06:38:08 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 42
Distribution: world
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Because of one of Tom's (W8JI) posts, I decided to check
the parasitic suppressor resistors that I had previously
installed in my oscillating HF amplifier.  The resistors
were "non-inductive" metal film types, but I nevertheless
decided to inspect one, just to see.  The resistive element
was easily exposed by scraping off the outer layer of paint,
and to my surprise, there was a distinct spiral-wound pattern
in the body of the resistor.

My next task was to find a few 1W or 2W carbon composition
resistors that I could install in the suppressors, and this
turned out to be a formidable undertaking.  In fact, if anyone
reading this hasn't tried to find these resistors lately,
you're in for a shock.  I must've called twenty or thirty
distributors and parts houses looking for these, with no luck.
All they had were either carbon or metal film.

Newark, which does show them in their catalog, requires a
minimum quantity purchase on 2W resistors that amounts to
$50 to $100 worth of a single value.  Even at that, there's
no guarantee the parts are truly non-inductive.  Like Tom says,
even some carbon comps are constructed in such a way as to
introduce inductance into their design.

For me, the problem's resolved.  I stopped at a small, old-time
parts house recently, purely by accident, and found a good
supply of N.O.S. 82 and 120 ohm, 2W carbon comps.  I suspect
the only reason these were in stock is that they're an unusual
value for most solid state equipment.  The owner even said that
as he sells them out, he orders replacements in carbon/metal
film.  Needless to say, I have since broken a few apart, just
to be sure they really are non-inductive!

So, if you're reading this and you're into tube-type HF amps,
now's the time to stock up on a few of these resistors.  Don't
wait until they are TOTALLY unavailable.  Also, if you do find
them locally like I did, don't forget to take a pair of
Vise-Grips so you can crack one open and look inside.  :)

73,

Jack  WB3U

From [e-mail] Wed 07 Jun 95 15:58:51
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Russ Renaud)
Subject: FET pre-amps and NF
Message-ID: <[e-mail]>
Sender: [e-mail] (Russ Renaud)
Reply-To: [e-mail] (Russ Renaud)
Organization: The National Capital FreeNet, Ottawa, Ontario, Canada
Date: Tue, 6 Jun 1995 11:54:59 GMT
Lines: 27


I was planning on building a 10 metre pre-amp from a design in the 1994
ARRL Handbook by Kent Britain.  I was hoping to improve my downlink
reception for RS-15.  The design calls for either a 3sk48, 3sk51 or 3n204
dual-gate MOSFET.  The author states that a pre-amp noise figure of 1db to
1.5 db from 28MHz to 220MHz is achievable using the aforementioned
devices.  These being difficult to find locally, one local supplier
suggested an NTE222 as a direct replacement for the 3n204.  When I looked
at the spec sheet, the NTE222 is described as having a "NF 6dB Max at
200MHz".

This is a far cry from the 1 to 1.5 dB noise figure for which I
was hoping.  This raises a question:

How is the published NF determined by the manufacturer? Are they referring
to noise factor or noise figure? Is noise factor dependant on bandwidth?

In the end, I ended up buying a NTE454, which has a "NF" 1.5 dB less than
than the NTE222.

Russ va3rr/aa8lu [e-mail]







From [e-mail] Wed 07 Jun 95 15:58:51
Newsgroups: rec.radio.amateur.homebrew
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From: Jack Mott <[e-mail]>
Subject: Frequency Counter Recommendation
Sender: [e-mail] (usenet guy)
Message-ID: <[e-mail]>
Date: Sun, 4 Jun 95 20:52:53 GMT
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I am looking to get a frequency counter -- intially for just HF work, but
maybe up to 1.2 GHz in the future.  Any recommendations on a reasonably
priced unit?  I could build one, of course, but this seems like a good
piece of standard test equipment to purchase (who builds their own DVMs
these days?).

Charles Mott

From [e-mail] Wed 07 Jun 95 15:58:52
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From: [e-mail] (Gary V. Deutschmann Sr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Heathkit parts
Date: 7 Jun 1995 00:02:02 GMT
Organization: inlink
Lines: 37
Distribution: world
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.
To:  Marcel
From:  Gary
RE:  Heathkit Addresses & Numbers
.
MAIN OFFICE:
     Heathkit
     P. O.  Box  1288
     Benton Harbor, MI  49023
.
FREE CATALOG:
     1-800-44-HEATH
.
ORDER PHONE:
     1-800-253-0570
.
FAX ORDER PHONE:
     1-616-925-4876
.
CUSTOMER SERVICE:
     1-800-253-0570
.
TECHNICAL CONSULTANTS:
     Educational Products  1-616-925-4914
     Security & Lighting   1-616-925-5181
.
PARTS REPLACEMENT:
     Have Part # Ready 1-616-925-5899
.
PRODUCT REPAIR SERVICE:
     1-616-925-3273
.
TTUL - 73+ de Gary - N0ZOI @ K0PFX.#STL.MO.USA.NA
.




From [e-mail] Wed 07 Jun 95 15:58:53
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From: [e-mail] (Kirk Norton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Hewlet Packard GaSFETs
Date: 5 Jun 1995 18:51:21 GMT
Organization: Hewlett-Packard, San Diego Division
Lines: 41
Distribution: world
Message-ID: <3qvjn9$[e-mail]>
References: <3qp6dq$[e-mail]>
NNTP-Posting-Host: hpsdlec5.sdd.hp.com

I just happen to have my HP data book right here...

HPPN        Gate Width   Optimum    Test      NFo    Ga      Package
               (um)       Freq.     Freq.     (dB)   (dB)
                          (GHz)     (GHz)

ATF-35076      200        4-18       12       0.75   10.5    70 mil ceramic
ATF-35176      200        4-18       12       0.85   10.0    70 mil ceramic
ATF-35376      200        4-18       12       1.0    10.5    70 mil ceramic

These parts are listed as low noise GaAs PHEMT's.  The book recommends
that the lowest noise part (35076) be used as the first stage of a
cascaded amplified.  The following stages could be any of them.

As far as biasing goes, I'm still learning about that myself.

Hope this helps.


In article <3qp6dq$[e-mail]>, [e-mail] (Sean McHenry) writes:
|>
|>      Someone recently gave me a handfull of the following parts and I have
|> no idea what to use them for yet.  Could someone give me the lowdown on
|> their design specs (short form)?
|>    ATF-35076
|>    ATF-35176
|>    ATF-35376
|>     All are Hewlet Packard devices.  GaSFETS?  Would the simple "common"
|> types of biasing designs work with these?  Gain and at what Freq.s?  Thanks,
|> Sean  (aka KB8JNE)
|> --
|> [e-mail]     In Cyberspace, no one can hear you scream.
|>

--
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Kirk Norton                                   Hewlett-Packard Company
 Internet:  [e-mail]                      Home Imaging Division
 Phone: [phone]             16550 West Bernardo Drive, M/S 8-20
 FAX: [phone]                          San Diego, CA 92127-1899


From [e-mail] Wed 07 Jun 95 15:58:54
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From: wayne@PROBLEM_WITH_INEWS_GATEWAY_FILE (Wayne Covington)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Hewlet Packard GaSFETs
Date: 5 Jun 1995 18:52:43 GMT
Organization: Hewlett-Packard Fort Collins Site
Lines: 23
Message-ID: <3qvjpr$[e-mail]>
References: <3qp6dq$[e-mail]>
NNTP-Posting-Host: hpccqd.fc.hp.com
X-Newsreader: TIN [version 1.2 PL2]

Sean McHenry ([e-mail]) wrote:

>      Someone recently gave me a handfull of the following parts and I have
> no idea what to use them for yet.  Could someone give me the lowdown on
> their design specs (short form)?
>    ATF-35076
>    ATF-35176
>    ATF-35376

These are GaAs FETs.  Typical specs, all in dB, Vds=1.5V, Ids=10mA:

                              ATF-35076   ATF-35176   ATF-35376

optimum NF @ 4 GHz              0.25        0.30        0.40
optimum NF @ 12 GHz             0.75        0.85        1.00

gain @ 4 GHz at optimum NF      16.0        16.0        15.0
gain @ 12 GHz at optimum NF     11.0        11.0        10.0

To make optimum use of these devices, you'll need the S parameters.

Wayne Covington
KD0EA

From [e-mail] Wed 07 Jun 95 15:58:55
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From: [e-mail] (Gary Hosler - KN0Z)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Hi Voltage Diodes for HT supply
Date: 5 Jun 1995 17:59:21 GMT
Organization: 3M Company
Lines: 18
Message-ID: <3qvglp$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ghosler.mmm.com
X-Newsreader: IBM NewsReader/2 v1.02

In <[e-mail]>, Conrad Farlow <[e-mail]> writes:
>Can anyone tell me where I can get some diodes to make a bridge for my
>EHT supply for my new Pa.I will be running 3kv at up to 1.5 Amps.I
>think I saw reference to a place called Silicon Alley or something
>like that.If its in the US do they accept Visa orders by phone?
>Many thanks
>Conrad Farlow G0RUZ
>email [e-mail]
>packet radio G0RUZ @ GB7WRG.#19.GBR.EU

You're looking for:
K2AW's Silicon Alley
175 Friends Lane
Westbury, NY 11590
Phone [phone]

Hope the info helps!  73 & GUD DX


From [e-mail] Wed 07 Jun 95 15:58:55
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From: [e-mail] (FPerry and LButler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Last try
Date: 6 Jun 1995 02:15:14 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 8
Message-ID: <3r0dni$[e-mail]>
NNTP-Posting-Host: cais3.cais.com

I am trying to get in touch with "Lucky" Hurder.  I would appreciate it
if someone would either send me his email address or forward this to him.

Thanks in advance and sorry about the first flubbed posting.

Frank Perry  [e-mail]



From [e-mail] Wed 07 Jun 95 15:58:56
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From: [e-mail] (Michael Stein)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: LNA for GPS (GaAsFET's vs. MMIC's)
Date: Fri, 02 Jun 1995 18:32
Organization: University of California, Los Angeles
Lines: 8
Sender: MVS NNTP News Reader <[e-mail]>
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>I am thinking about building a GPS receiver from scratch
>to learn more about this kind of stuff.  After looking
..
>Also, could someone point me to some good reference materials
>on designing (layout, supply isolation, etc.) 1.5 GHz receivers.

I seem to remember a series of articles in Wireless World (UK pub)
on building a GPS receiver...

From [e-mail] Wed 07 Jun 95 15:58:57
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!psinntp!psinntp!psinntp!psinntp!arrl.org!zlau
From: [e-mail] (Zack Lau (KH6CP))
Subject: Re: LNA for GPS (GaAsFET's vs. MMIC's)
References: <3qnole$[e-mail]> <3quk03$[e-mail]>
Organization: American Radio Relay League
Date: Mon, 5 Jun 1995 13:42:47 GMT
X-Newsreader: TIN [version 1.2 PL2]
Message-ID: <[e-mail]>
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Joanne Dow ([e-mail]) wrote:

: Considering the AJ margin built into the GPS signal and that thermal noise is
: just another form of jamming fighting noisefigure down to very low levels may be
: less than rewarding. Do remember that you have 99% of the time interference from
: at least 3 other satellites "jamming" your desired signal. This can go to as
: great as something like 7 signals during some intervals. I'd suspect that a
: 2-3dB noise figure should perform as well as a .1dB noisefigure would. (Heck,
: 6dB would probably do decently.)

This doesn't sound right.  I thought the spread spectrum was intelligently
done so that when you despread the signals, they all correlate into
independent data streams that don't interfere with each other.
--
Zack Lau  KH6CP/1           2 way QRP WAS
                           8 States on 10 GHz
Internet: [e-mail]   10 grids on 2304 MHz

From [e-mail] Wed 07 Jun 95 15:58:58
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news2.near.net!news.delphi.com!usenet
From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: LNA for GPS (GaAsFET's vs. MMIC's)
Date: 5 Jun 1995 09:49:55 GMT
Organization: Delphi Internet Services Corporation
Lines: 39
Message-ID: <3quk03$[e-mail]>
References: <3qnole$[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
NNTP-Posting-Host: bix.com
X-Newsreader: NetBix 0.48
X-Newsreader-Author: [e-mail] (Loren Wilton)
    This message has been posted with development version software.
    If there are any problems with the message format, send me mail.

In article <3qnole$[e-mail]>, [e-mail] (Kirk Norton) wrote:
>I posted this to sci.electronics, but the response has not
>been huge, so I'll try here...
>
>I am thinking about building a GPS receiver from scratch
>to learn more about this kind of stuff.  After looking
>in HP's Communiucations Components data book, I was
>convinced that the best performing LNA to put at the
>base of an antenna would be made from a couple of discrete
>GaAsFET's (like the HP ATF-10170) instead of a MMIC,
>assuming I do the layout properly.  Anyone disagree with
>this assessment.
>
>Also, could someone point me to some good reference materials
>on designing (layout, supply isolation, etc.) 1.5 GHz receivers.
>
>Once I figure all of this out, I'll post the results just in
>case anyone is interested.
>
>Thanks for your time!
>
>--
>                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Kirk Norton                                   Hewlett-Packard Company
> Internet:  [e-mail]                      Home Imaging Division
> Phone: [phone]             16550 West Bernardo Drive, M/S 8-20
> FAX: [phone]                          San Diego, CA 92127-1899
>

Considering the AJ margin built into the GPS signal and that thermal noise is
just another form of jamming fighting noisefigure down to very low levels may be
less than rewarding. Do remember that you have 99% of the time interference from
at least 3 other satellites "jamming" your desired signal. This can go to as
great as something like 7 signals during some intervals. I'd suspect that a
2-3dB noise figure should perform as well as a .1dB noisefigure would. (Heck,
6dB would probably do decently.)

{^_^}     Joanne Dow     The Wizardess


From [e-mail] Wed 07 Jun 95 15:59:00
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From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: LNA for GPS (GaAsFET's vs. MMIC's)
Date: 7 Jun 1995 07:15:42 GMT
Organization: Delphi Internet Services Corporation
Lines: 56
Message-ID: <3r3jmu$[e-mail]>
References: <3qnole$[e-mail]> <3quk03$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
NNTP-Posting-Host: bix.com
X-Newsreader: NetBix 0.48
X-Newsreader-Author: [e-mail] (Loren Wilton)
    This message has been posted with development version software.
    If there are any problems with the message format, send me mail.

In article <[e-mail]>, [e-mail] (Zack Lau (KH6CP)) wrote:
>Joanne Dow ([e-mail]) wrote:
>
>: Considering the AJ margin built into the GPS signal and that thermal noise is
>: just another form of jamming fighting noisefigure down to very low levels may be
>: less than rewarding. Do remember that you have 99% of the time interference from
>: at least 3 other satellites "jamming" your desired signal. This can go to as
>: great as something like 7 signals during some intervals. I'd suspect that a
>: 2-3dB noise figure should perform as well as a .1dB noisefigure would. (Heck,
>: 6dB would probably do decently.)
>
>This doesn't sound right.  I thought the spread spectrum was intelligently
>done so that when you despread the signals, they all correlate into
>independent data streams that don't interfere with each other.
>--
>Zack Lau  KH6CP/1           2 way QRP WAS
>                           8 States on 10 GHz
>Internet: [e-mail]   10 grids on 2304 MHz

Read up on spread spectrum some more. What happens is any uncorrelated signal is
spread out to the greater of the bandwidth of the local estimate of the spread
spectrom signal or the signal's original bandwidth. ie a CW signal interfering
with a GPS signal would be spread to the original GPS bandwidth while a very
broadband noise source would remain a very broadband noise source with some
modulation on it that could in theory be recovered using the original noise
signal and time delays.

You have data at 50 bits per second riding on the GPS signal that is more or
less critical. You have a 1.023 megabits per second chipping rate. This gives
you on the order of 1e6/50 or 20,000:1 anti-jam ratio, about 43dB.  7 other such
signals at the same level as yours will lower this by a factor of 7 or about
8.5dB. This means that you still have some 34.5dB of anti-jam margin. The jammer
can be front end noise as easily as it can be a jammer. This implies noise
figure is not "critical".

Since we're talking noise floor of about -204dBW/Hz and an effective bandwidth
of 100Hz or so (for roundish numbers) for the data and maybe 10Hz or less for
the positioning loop lock we're talking about -184dBW for the data and -194dBW
for the position loop. Signals, if I remember correctly, are in the -170dBW
range. So you have a VERY healthy carrier to noise ratio in either bandwidth
with a "0dB" receiver. A low noise figure helps a bit with vehicle dynamics by
reducing "errors" in the data or position loop it has some advantages,
particularly with "marginal" receiver designs. But GPS was built to survive some
downlink jamming. So any way you cut this analysis you should get decent
performance with noise figures even as high as 10dB or 20dB. But in the
interests of an easy receiver design for commercial purposes I suspect 1 or 2dB
noise figure is more than adequate. ("Commercial purporses" is a code tracker
rather than carrier tracker and is interested in the "advertised" accuracy
levels. For differential use the 2dB or better front end is probably well worth
it.) (mumble - 1MHz code => 1000' long "chips". 24dB carrier to noise is pretty
low so errors on that 1000' is reduced to perhaps 10' or so. *REAL* rough
guesstimates here.)

{^_^}     Joanne Dow, Amiga Exchange Editor on BIX
          [e-mail]   The Wizardess


From [e-mail] Wed 07 Jun 95 15:59:02
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!nntp.et.byu.edu!netline-fddi.jpl.nasa.gov!hudson.lm.com!godot.cc.duq.edu!newsfeed.pitt.edu!dbisna.com!psinntp!psinntp!psinntp!psinntp!arrl.org!zlau
From: [e-mail] (Zack Lau (KH6CP))
Subject: Re: LNA for GPS (GaAsFET's vs. MMIC's)
References: <3qnole$[e-mail]> <3quk03$[e-mail]> <[e-mail]> <3r3jmu$[e-mail]>
Organization: American Radio Relay League
Date: Wed, 7 Jun 1995 14:14:22 GMT
X-Newsreader: TIN [version 1.2 PL2]
Message-ID: <[e-mail]>
Lines: 28

Joanne Dow ([e-mail]) wrote:
: In article <[e-mail]>, [e-mail] (Zack Lau (KH6CP)) wrote:
: >Joanne Dow ([e-mail]) wrote:
: >
: >: Considering the AJ margin built into the GPS signal and that thermal noise is
: >: just another form of jamming fighting noisefigure down to very low levels may be
: >: less than rewarding. Do remember that you have 99% of the time interference from
: >: at least 3 other satellites "jamming" your desired signal. This can go to as
: >: great as something like 7 signals during some intervals. I'd suspect that a
: >: 2-3dB noise figure should perform as well as a .1dB noisefigure would. (Heck,
: >: 6dB would probably do decently.)
: >
: >This doesn't sound right.  I thought the spread spectrum was intelligently
: >done so that when you despread the signals, they all correlate into
: Read up on spread spectrum some more. What happens is any uncorrelated signal is
: spread out to the greater of the bandwidth of the local estimate of the spread

Thanks for the correction--I really ought to study the details of the
GPS system.  It does make sense to provide enough S/N for each signal
so that interference between them isn't a problem.

If all you need is a 4 dB NF, a MAR-6 MMIC at the feedpoint ought to do
just fine.  Of course, there are more expensive GaAs devices for even lower
noise figures.
--
Zack Lau  KH6CP/1           2 way QRP WAS
                           8 States on 10 GHz
Internet: [e-mail]   10 grids on 2304 MHz

From [e-mail] Wed 07 Jun 95 15:59:03
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!uunet!in1.uu.net!america.com!usenet
From: "Paul C. Barnes" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for conversion info for SSB CB
Date: 7 Jun 1995 02:49:16 GMT
Organization: PSS InterNet Services, InterNet in Fl 904 253 7100
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There was a device called a PAL VXO Tuning Monitor.  It plugged into a
crystal socket of a CB radio to move it between channels, etc.  I have
two of these.  They came in various standard freqs. that fit the crystal
being replaced.  It was only a matter of changing the crystal, I believe.
 I have used this with a CB radio and moved it to 10 meters in the manner
you describe.  It works great and covers the blank spots between
channels.  Don't forget you have to retweek the RF sections, both
transmit and receive.  Not hard at all.  I have several converted CB
radios that I have used on 10 at different times.  The one hang-up is
there are Uniden and Radio Shack 10 rigs that are as cheap to buy and use
as converting a CB.  Good luck.


From [e-mail] Wed 07 Jun 95 15:59:04
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!uwm.edu!spool.mu.edu!bloom-beacon.mit.edu!news2.near.net!sunfish.hi.com!brainiac.hi.com!user
From: [e-mail] (Steve Byan)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Low-Band DXing errata
Date: Tue, 06 Jun 1995 12:54:14 -0400
Organization: Hitachi Computer Products, Inc.
Lines: 27
Message-ID: <[e-mail]>
NNTP-Posting-Host: brainiac.hi.com
Xref: grape.epix.net rec.radio.amateur.antenna:10869 rec.radio.amateur.homebrew:7669

Has anyone else noticed the following error in Devoldere's "Low-band
DXing"? It's in both editions.

In the section on single-wire Beverage antenna matching transformers, the
book gives the following formula for the number of turns on a toroid for a
given inductance:

N = 100 sqrt (L / AL)

(Note that in the second edition, the square-root radical sign is
misprinted as a multiplication.)

The formula is correct for AL values in units of uH/100 turns.

The book contains a table containing AL values for several types of
toroids and the turns-count for transformers to match to 50 ohm and 75 ohm
feedlines. The AL values for the iron-core toroids are given in units that
match the formula, but the AL values for the ferrite toroids are given in
units of mH/1000 turns. Consequently the turns-count for the transformers
that use ferrite cores are too high by a factor of the square-root of 10
(about 3).

--
Steve Byan                                  internet: [e-mail]
Hitachi Computer Products (America), Inc.
1601 Trapelo Road                           phone: [phone]
Waltham, MA 02154                           FAX: [phone]

From [e-mail] Wed 07 Jun 95 15:59:05
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From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Mods for R-390A or its SSB adapter CV-157  ?
Date: 5 Jun 1995 09:50:02 GMT
Organization: Delphi Internet Services Corporation
Lines: 52
Message-ID: <3quk0a$[e-mail]>
References: <3qkp53$[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
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    This message has been posted with development version software.
    If there are any problems with the message format, send me mail.
Xref: grape.epix.net rec.radio.amateur.equipment:12842 rec.radio.amateur.homebrew:7656

In article <3qkp53$[e-mail]>,
   "J.Swenson" <[e-mail]> wrote:
>Now I know these rigs are just great the way they are !  I may get some
>people upset at the thought of changing originals but I am new to this
>equipment and don't want to miss out on anything !  Anyone have any neat
>mods for these ?   Also let me take this time to thank all who helped in
>the purchase questions on the R390/R390A.  As you can see I came up with
>a nice deal on a R390A (ok but but dead 11 & 25 mhz) and a spare for
>parts as well as a CV-157 SSB adapter minus the meters and a few tubes.
>The 157 had a number of problems but mostly minor. It now has one dead
>channel but I are working an that. I still have to get a 390 manual to
>look at the band problems but that should not be too bad.  Fixing these
>are half the fun !  Thanks in advance for any reply.  73's N1DVE
>

Do be aware that the R-390A and the R-390 have very different schematics. I do
have a set of hacks in mine, including a beam deflection tube SSB/CW detector, a
modified noise limiter, hang agc, and "0" to 500KHz reception (of a sort.) Alas,
I do not have them written up in a form for posting. Howsosomeever, if you are
clever enough it is easy to generate these sorts of hacks for yourself with
ideas from the ARRL Handbook and old QSTs. You can build the schematic easily
enough by tracing the physical sircuitry yourself. That is how I did it until I
got my manual.  (I even discovered that the ground "bus" input side of the
mechanical filters was never grounded to the chassis. Once I grounded it things
suddenly came alive and worked the way I expected. I bet that is why I got this
beautiful thing surplus looking so clean. - Um this was back in about '69 or
so.) Treat your baby with adequate respect and be careful with the mods. It will
then do very well for you.

Mumble - 11MHz and 25MHz dead? Schematics are too hard to get at the moment but
that sounds like you either need a dose of contact cleaner or you have at least
one more band out.... 0.5 - 8MHz the receiver is triple conversion to a variable
17-25MHz first IF. Nope - your two "out" frequencies are not in that overlap
band. Check the crystal sockets in the upper oven. These crystals run 11-34Mhz
in 1MHz steps for conversion of a 1MHz band to the 3 to 2Mhz range. (Note the
inversion.) You probably have the 14Mhz and 28MHz crystals dead or lose or
needing pins cleaned. (It IS possible that 430A and 431E are sick, too. Um, I
went and got the schematics anyway...) The actual crystal frequencies are half
the injection frequencies in some cases. So look for a bad Y409 at 14MHz. That
covers both bad bands.)

No - I won't sell my manual on a bet. Nor do I want to pull it apart for
copying. There used to be services that sold copies, though. You want
TM 11-5820-358-35

Field and Depot Maintenance Manual
Radio Receiver R-390A/URR

Hope this is SOME help.

{^_^}     Joanne Dow     The Wizardess


From [e-mail] Wed 07 Jun 95 15:59:06
Path: grape.epix.net!news.sprintlink.net!hookup!noc.tor.hookup.net!news
From: Jeff Krul <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Subject: NEED HELP!  Respond : Grounding 'Experts' !
Date: 7 Jun 1995 18:19:12 GMT
Organization: EQUIST Inc.
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Xref: grape.epix.net rec.radio.amateur.antenna:10909 rec.radio.amateur.homebrew:7678 rec.radio.amateur.misc:80334 rec.radio.amateur.digital.misc:8794

I am in the process of putting together a new HAM 'shack', and I have
come across an interesting 'snag'.

I have heard, many times before, to be sure the HAM radio ground is NOT
grounded to the house wiring ground system.  Various explanations follow,
usually to avoid having the house wiring turn into a massive antenna.

Anyways, I was SURE to separate the two and overlooked one point . . .
packet !  My TNC uses a serial cable, connected to my computer, which in
turn has a grounded chassis!  Argh!  To top it all off, the serial cable
is NOT the right way to ground to a 'secondary' ground.  Talk about a
'high' resistance path to ground, forming an 'ideal' ground loop!!!!

My question is, "How can I avoid this, and if I cannot, what effect will
grounding to the house ground REALLY have?"  "What are my OTHER options?"

Thanks for your replies in advance,
Jeff
VE3QED

Please e-mail your responses to [e-mail]



From [e-mail] Wed 07 Jun 95 15:59:07
Path: grape.epix.net!news.sprintlink.net!gatech!bloom-beacon.mit.edu!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Pesky AL values, was Re: Low-Band DXing errata
Date: 6 Jun 1995 17:52:27 GMT
Organization: University of Colorado, Boulder
Lines: 19
Message-ID: <3r24kr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: spot.colorado.edu
Xref: grape.epix.net rec.radio.amateur.antenna:10873 rec.radio.amateur.homebrew:7670

Could anyone tell me why toriods are rated in "AL values" such as uH/100
turns, or mH/1000 turns?  These "AL values" are often mislabled "units"
but do not have the correct dimensions, which are actually
inductance/(turns)^2.

Some vendors sell toroids spec'd as nH/(turns)^2, such as Johnson Shop
Products, and simple dimensional analysis yields the correct procedure to
get the inductance of a coil wound on one of these.  Numerically, but not
dimensionally, mH/1000 T = nH/T^2, and (1/10) uH/100 T = nH/T^2.

Could anyone tell me why toriods are rated in "AL values" such as uH/100
Given that AL values seem to lead to confusion, such as the typo in Low
Band DXing, and are not even dimensionally correct, why is their use so
widespread?  I seem to recall quite a bit of space devoted to explanation
of AL values in one of the license manuals, and also in the ARRL handbook.
Perhaps this space might be put to better use.

Bruce Tiemann
N6URH

From [e-mail] Wed 07 Jun 95 15:59:08
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Pesky AL values, was Re: Low-Band DXing errata
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <3r24kr$[e-mail]>
Date: Wed, 7 Jun 1995 15:38:02 GMT
Lines: 35
Xref: grape.epix.net rec.radio.amateur.antenna:10897 rec.radio.amateur.homebrew:7674

In article <3r24kr$[e-mail]> [e-mail] (TIEMANN BRUCE) writes:
>Could anyone tell me why toriods are rated in "AL values" such as uH/100
>turns, or mH/1000 turns?  These "AL values" are often mislabled "units"
>but do not have the correct dimensions, which are actually
>inductance/(turns)^2.
>
>Some vendors sell toroids spec'd as nH/(turns)^2, such as Johnson Shop
>Products, and simple dimensional analysis yields the correct procedure to
>get the inductance of a coil wound on one of these.  Numerically, but not
>dimensionally, mH/1000 T = nH/T^2, and (1/10) uH/100 T = nH/T^2.
>
>Could anyone tell me why toriods are rated in "AL values" such as uH/100
>Given that AL values seem to lead to confusion, such as the typo in Low
>Band DXing, and are not even dimensionally correct, why is their use so
>widespread?  I seem to recall quite a bit of space devoted to explanation
>of AL values in one of the license manuals, and also in the ARRL handbook.
>Perhaps this space might be put to better use.

AL values are favored for the same reason meters per second are favored
over furlongs per fortnight. And that reason is that most calculations
can be done easily in your head, rather than having to reach for a
calculator. As you note, T^2 is already built into the values, so you
don't have to do that in your head when using AL values to calculate
the number of turns you need for a given inductance.

This is mostly a historical artifact now that all of us routinely have
a scientific calculator close at hand. In the manual arithmetic days,
it saved a bit of work, and another possible source of manual math error.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |

From [e-mail] Wed 07 Jun 95 15:59:09
Path: grape.epix.net!news.sprintlink.net!pipex!swrinde!ihnp4.ucsd.edu!network.ucsd.edu!news-mail-gateway
From: [e-mail] (Duncan Cadd)
Newsgroups: rec.radio.amateur.homebrew
Subject: R390A mods etc
Date: 7 Jun 95 13:29:24 GMT
Organization: ucsd usenet gateway
Lines: 18
Message-ID: <9506071329.AA01761@alpha>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Greetings, from a wet Diepenbeek in N.E. Belgium!


Whoever was looking for R390A mods - I suggest you subscribe and / or post a
request to the boatanchors list (if you want details, mail me direct).  I've
seen literally dozens of bits of info on these radios, many, many people on
that list have one and there's a LOT of info going.  This last week I've even
seen that NEW R390(A?) manuals are available from NIST - sorry, but not being a
390 owner, I ditched the postings.


Mail me if you want to know more.
73,


Duncan Cadd   G0UTY  /  ON9CHU   G-QRP 8117

[e-mail]

From [e-mail] Wed 07 Jun 95 15:59:10
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!bloom-beacon.mit.edu!news.tamu.edu!news.utdallas.edu!corpgate!bcarh189.bnr.ca!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ae517
From: [e-mail] (Russ Renaud)
Subject: Re: Recverter, VHF down to HF?
Message-ID: <[e-mail]>
Sender: [e-mail] (Russ Renaud)
Reply-To: [e-mail] (Russ Renaud)
Organization: The National Capital FreeNet
References: <[e-mail]>
Date: Mon, 5 Jun 1995 12:54:37 GMT
Lines: 17


David Toste ([e-mail]) writes:
> Does anyone know where I could find plans for a convert that would allow
> me to listen in on the VHF band down on a HF rig? I keep seeing converters
> the bring the shortwave band up to VHF and I'm sure there would be one
> that would allow the other way around. Anyone have any ideas? Or know
> where I can look up the plans>?
>
RSGB VHF/UHF Manual has several plans, but some of the active devices may
be difficult to obtain in North America.

Hamtronics in Hilton, N.Y. sells some workable kits.  I've built their
435-to-28MHz receive converter for pacsat use, and it works as advertised.
Dual-gate GaAsfet preamp and mixer make it reasonably sensitive.

Russ, va3rr/aa8lu


From [e-mail] Wed 07 Jun 95 15:59:10
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!cs.utexas.edu!utnut!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!at738
From: [e-mail] (David Toste)
Subject: Recverter, VHF down to HF?
Message-ID: <[e-mail]>
Sender: [e-mail] (David Toste)
Reply-To: [e-mail] (David Toste)
Organization: The National Capital FreeNet
Date: Mon, 5 Jun 1995 06:54:52 GMT
Lines: 12

Does anyone know where I could find plans for a convert that would allow
me to listen in on the VHF band down on a HF rig? I keep seeing converters
the bring the shortwave band up to VHF and I'm sure there would be one
that would allow the other way around. Anyone have any ideas? Or know
where I can look up the plans>?


--
 David Toste [VE3TOS]        Internet - [e-mail]
 Don Mills, Ontario.          SWLOGit - The Ultimate Shortwave Listeners
 ftp.virginia.edu  /pub/swlogit/        Software. (Fidonet: 1:250/930)
 http://itre.uncecs.edu/radio/software/SWLogit.html (SWLOGit Web Page)

From [e-mail] Wed 07 Jun 95 15:59:11
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!gatech!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Recverter, VHF down to HF?
Date: 6 Jun 1995 02:12:06 GMT
Organization: News & Observer Public Access
Lines: 16
Message-ID: <3r0dhm$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: grail616.nando.net

[e-mail] (David Toste) wrote:
>
> Does anyone know where I could find plans for a convert that would allow
> me to listen in on the VHF band down on a HF rig? I keep seeing converters
> the bring the shortwave band up to VHF and I'm sure there would be one
> that would allow the other way around. Anyone have any ideas? Or know
> where I can look up the plans>?
>

Ther have been a number of VHF to HF converters (and transverters)
published in QST over the years.  My 1994 ARRL Handbook has "Linear
Transverters for 144 and 220 MHz" on page 31-17.  You could build
just the receive portion if you wanted.

73,
Don W3FPR

From [e-mail] Wed 07 Jun 95 15:59:12
Path: grape.epix.net!news.sprintlink.net!jaring.my!j3.glg2.jaring.my!phoa
From: [e-mail] (Phoa Kia Teck)
Newsgroups: rec.radio.amateur.homebrew
Subject: REF: 3SK122 dual gate mosfet
Date: Mon, 5 Jun 1995 20:56:08
Organization: The one that has not set up it machine properly
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: j3.glg2.jaring.my
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

I have these Nec dual gate mosfet 3SK122 , willing to sell at a low price to
all electronics hobbies.

From [e-mail] Wed 07 Jun 95 15:59:12
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!news.mindlink.net!vanbc.wimsey.com!sanjuan.islandnet.com!salmon!clinton.peebles
From: [e-mail] (Clinton Peebles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Remote coax switch
Date: Sat, 27 May 1995 12:58:45 GMT
Message-ID: <[e-mail]>
Organization: Salmon Siding Saloon BBS 604-357-9942
Distribution: world
Lines: 11

Does anyone have plans for a remote coax switch suitable for HF bands?

Thanks.
     ╔══════════════════════════════════════════════════════╗
     ║    Clinton Peebles  VE7-KNL                          ║
     ║    SYSOP - Salmon Siding Saloon BBS - 604-357-9942   ║
     ║    Internet: [e-mail]        ║
     ║    Packet Radio: VE7KNL@VE7CW.#SEBC.BC.CAN.NOAM      ║
     ╚══════════════════════════════════════════════════════╝
---
 ■ QMPro 1.53 ■ I have a good memory, it's just really, really short.

From [e-mail] Wed 07 Jun 95 15:59:15
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!decwrl!enews.sgi.com!mti.sgi.com!news.corp.sgi.com!chuck.dallas.sgi.com!adams
From: [e-mail] (chuck adams)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Replacement for 40673?
Date: 5 Jun 1995 19:22:02 GMT
Organization: Silicon Graphics, Inc.
Lines: 92
Distribution: world
Message-ID: <3qvlgq$[e-mail]>
References: <3q2gpf$[e-mail]> <3q2pps$[e-mail]> <3q3dsp$[e-mail]> <3q8enp$[e-mail]> <3qi8rp$[e-mail]>
NNTP-Posting-Host: chuck.dallas.sgi.com

How about the following dual-gate mosfet?  It's a Motorola MPF131
and I have a supply of house numbered critters and have been letting
them go for 3/$1 USofA and charging only $0.55 for postage and handling,
but I don't want to be doing this for a living.  I really have a job.
These critters are light, so I think I can get a dozen or so in an
envelope with the critters wrapped in Alum. Foil.  I do static protection
steps to keep from zapping them and my source has them in Aluminum foil
lined box.  I don't have the facilities or the time to test each one,
but they should be OK.  I'm not making anything on this to pay for my
valuable time.

Here are the stats:

Ye Ol Motorola manual says:

MPF131
N-channel   Dual Gate  MOS Field-Effect silicon transistor

depletion mode transistor designed for VHF amplifier and
mixer applications.

RF amplifier @ 60  and 200 MHZ

Max voltage , drain-source = 25 volts
Max current, drain = 30 ma.
Max power dissipation = 350 mw.


         gate 2      ___      drain
             <======/   \======>
                   |     |
             <======\__o/======>
         gate 1               source

                  top view


                NOT TO SCALE
             (must I tell you)

info above from Kaye Hartman,  KD8EK

And in another email I got:


        MPF131 - Depletion type dual gate MOSfet with diode-protected gates
Speced as RF AMP @ 60 Mhz and 200 Mhz

Dot on plastic package indicates SOURCE lead, going counter-clockwise
from there: DRAIN, GATE2, GATE1.

Max ratings
Volts-drain-source 25
Drain Current   30 ma.
Ta= 25 degrees C 300 mW (hey its QRP!)

Gate 1 to source cutoff voltage -4.0 vDC
Gate 2 to source cutoff voltage -4.0 vDC
Zero-gate voltage drain current Idss = 3ma min, 10ma typ, 30 ma max.

Forward transfer admittance 8000 umho min, 20,000 umho max
this is biassed at Vds 10vDC, Id=10ma, 1Khz

Ciss = 4.5 pf typ, 7.0 pf max
Coss = 2.5 pf typ, 4.0 pf max
Crss = .023pf typ, .05 pf max (in-circuit capacitance usually larger than this)

Noise figure    typ     max
60 Mhz          2.5dB   5.0dB
200 Mhz         3.0dB   5.0dB

Power gain (common source)
60 Mhz          20dB    27dB
200 Mhz         17dB    20dB

Used as a R.F. amplifier, Gate 2 is usually set at about 4 v D.C. (unless you
want to apply A.G.C. to it).

This I got from Glen Leinweber.

It may do in a pinch as a replacement and is certainly much cheaper.  Only problem:
I have to flatten the leads to get them mailed in an envelope.  :-)  Again, I don't
want to do this for very long and will do it until the supply runs dry.  I don't
take checks and the bank doesn't sell MOSFETs.  :-)  It's a problem of time
to drive to same, etc.  Green stamps OK, but email me first to determine if I am
going to have enough.  There are only a few thousand of these still around.
I'm in the callbook.

dit dit

--
Chuck Adams  K5FO  CP-60  [e-mail]

From [e-mail] Wed 07 Jun 95 15:59:16
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!gatech!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Replacement for 40673?
Date: 6 Jun 1995 02:17:20 GMT
Organization: News & Observer Public Access
Lines: 7
Message-ID: <3r0drg$[e-mail]>
References: <3q2gpf$[e-mail]> <3q2pps$[e-mail]> <3q3dsp$[e-mail]> <3q8enp$[e-mail]> <3qi8rp$[e-mail]> <3qvlgq$[e-mail]>
NNTP-Posting-Host: grail616.nando.net

Many thanks to all those who responded to my request for 40673
replacements.  I have been offered a box of 80 of the critters.
I will have lots of fun using them.  There seems to have been a
lot of interest here, I wish simolar fortune to any others.

73,
Don W3FPR

From [e-mail] Wed 07 Jun 95 15:59:17
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!nash.pubnix.net!mba!juxta!michael.black
From: [e-mail] (Michael Black)
Date: 05 Jun 95 23:30:06
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Replacement for 40673?
Message-ID: <[e-mail]>
Organization: MtlNet (MBA.org) Juxtaposition BBS
Lines: 43

I'm not sure who originated this thread, but there have been
various suggestions for replacements for 40673 MOSFET's.

What might be important to note is that the 40673 might not
have magically been a great device, but was used in so
many published projects because others had already used them.
When someobody wanted to build a new project, they'd look
at what others had used, and saw that 40673 in common use,
and decided to use it since it must be good or why was it
already chosen.

I remember my first MOSFET's, and they were not 40673's.  I
can't remember if I chose something else because I couldn't
get 40673's or because I wanted to find something cheaper.
I looked in a data book, and there were 40841's that looked
nearly as good.  So I used them.

The point to all this is that if you can't get 40673's, maybe
the way to go is look through the catalogs until you find
MOSFET's listed, and then check their specs to find something
suitable, instead of looking in a cross-reference guide and then
trying to find a designated replacement for the 40673.

I came up with an interesting source of MOSFET's just last fall,
though I haven't gotten around to using them to see if they
are good or falsely numbered.

It's in those "FM Boosters" that seem to be readily available.
I'd seen them, and passed them by due to cost.  Then I saw them
selling for under two dollars in a couple of places.  I bought
one out of curiosity.  Figured I'd find a bipolar transistor;
maybe I'd be lucky and find something like a 2N5179.  I opened
it up, and found a MOSFET, in the 3N200 series if I recall
correctly.  I went back to the store, and bought all that they
had (unfortunately, it was a few days later and some had already
been bought), at a dollar each.  Good price for MOSFET's.  If
anyone sees these FM Boosters (that's for receive, not xmit!)
at a low cost, it might be worth looking into them.
     Michael  VE2BVW
--
| InterNet: [e-mail]
| Standard disclaimer: The views of this user are strictly their own.


From [e-mail] Wed 07 Jun 95 15:59:18
Path: grape.epix.net!news.sprintlink.net!uunet!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: HP-342A Manual
Date: 7 Jun 1995 14:38:32 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 2
Sender: [e-mail]
Message-ID: <3r4rn8$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am looking for the operating and service manual (if one exists) for the
HP-342A noise meter. Thanks beforehand. Viny N1VC

From [e-mail] Mon 12 Jun 95 21:38:49
Path: grape.epix.net!news.sprintlink.net!demon!g0ruz.demon.co.uk!conrad
From: Conrad Farlow <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 3cx800 wanted
Date: 12 Jun 1995 01:52:28 +0100
Organization: None
Lines: 8
Sender: [e-mail]
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dispatch.demon.co.uk
X-Newsreader: Newswin Alpha 0.7
X-Posting-Host: g0ruz.demon.co.uk

Hello,I am looking for a used but good 3cx800 and base for a 6m Pa.It
must work and it must be cheap,please email me if you can help.

73 de Conrad G0RUZ
email [e-mail]
Packet Radio G0RUZ @ GB7WRG.#19.GBR.EU
"A sucessful eme'r is the one who wastes the least electricity"


From [e-mail] Mon 12 Jun 95 21:38:50
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!agate.berkeley.edu!tvr
From: [e-mail] (Tovar)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.homebrew
Subject: 440 HT limitations and homebrewing [was: * CLOSED REPEATER QUESTION]
Date: 12 Jun 1995 18:30:01 GMT
Organization: University of California, Berkeley
Lines: 39
Message-ID: <[e-mail]>
References: <3rf1sc$[e-mail]> <[e-mail]>
        <3rh4kh$[e-mail]>
NNTP-Posting-Host: cnmat.cnmat.berkeley.edu
In-reply-to: [e-mail]'s message of 12 Jun 1995 03:24:17 -0700
Xref: grape.epix.net rec.radio.amateur.policy:27951 rec.radio.amateur.homebrew:7735

    This 440 band plan is in Part 97 ... guarenteed simplex ... no repeater
    coordinator can grab it for their friends...

    These folks bought a dual band radio with two thirds of the 440 band
    missing. We would see similar issues raised on 2 meters if the radios were
    cut down to one or two MHz at the high end of that band.

That's because the manufacturers have only requested type-acceptance on
440-450 MHz.  And, for my rig, there's no mod to get the rest of the 440
band without running the risk of transmitting out-of-band, e.g. it's all
or nothing.  I think that may have been all that was available within
my price range when i got my license, so i didn't have alot of choice
in the matter.  Since then, a few HT cover the full band.  And how is
a new licensee supposed to know about these things?

    During this past week-end contest there was more activity in the 432
    area of the 440 band than on all two meter repeaters...SIMPLEX on 440 is
    between 431 and 435  if you are fm spread out from the side band guys
    operating slightly above 432.

Good to hear that.
                                  Real hams know how to use a vfo and buy
    multi-mode radios that cover all of the band. Some of them have been
    known to operate cw ... simplex no less

Real hams also homebrew, don't they?  But except for 1.2G and above,
almost all of the projects i've seen for VHF/UHf assume the existance
of HF hardware.  While there exists 440-capable IC's and off-the-shelf
helical filters to solve intermod and spectral quality problems, i
haven't seen any projects other than transverters and PAs (except for
a simple 2 meter monitoring receiver and a discussion on how to use the
R2/T2 pair [phasing direct conversion SSB] on 2 meters).

There are lots of HF QRP projects.  How about ideas on how a non-HF ham
can get started in homebrewing RF?  (I've already build a packet modem and
a 7.5V/13.8 moderate-speed charger.)  Also, can folks comment on working
the 'Lowfer' band?

                        -- KD6PAG  (networking old-timer, RF newbie)

From [e-mail] Mon 12 Jun 95 21:38:51
Path: grape.epix.net!news.sprintlink.net!nntp.bnl.gov!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 8044 CMOS Keyer I.C.
Date: Sat, 10 Jun 95 18:11:08 PDT
Organization: Brookhaven National Laboratory
Lines: 15
Message-ID: <[e-mail]>
References: <3r5ske$[e-mail]>
NNTP-Posting-Host: kwyman.dial.bnl.gov
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In article <3r5ske$[e-mail]>, <[e-mail]> writes:

>
>  I am looking for a good source for the 8044 or 8044BM. If anyone can help
> me please send email to [e-mail] .
>
> Thank you
>

I just ordered one today from Mouser Electronics...$19.95....but I didn't do
much shopping around...  Phone# is 800-346-6873

de Kevin (KF2VC)


From [e-mail] Mon 12 Jun 95 21:38:51
Path: grape.epix.net!news.sprintlink.net!demon!pacsat.demon.co.uk!slewis
From: Simon Lewis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Cross Field Antenna Designs - Any Good?
Date: 11 Jun 1995 02:46:03 +0100
Organization: None
Lines: 11
Sender: [e-mail]
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dispatch.demon.co.uk
X-Newsreader: Newswin Alpha 0.7
X-Posting-Host: pacsat.demon.co.uk

Im looking at a design in the G QRP mag about a cross field antenna
Do they work and has anyone tried this design (by their art editor)


--
+-------------------------------------------------------------------------+
|  73 From:  Simon Lewis GM4PLM - Helensburgh - Strathclyde - Scotland    |
| Packet: GM4PLM @ GB7SAN.#78.GBR.EU   Email: [e-mail]   |
| AMSAT - UK Member 4282     **** SUPPORT YOUR LOCAL AMSAT GROUP ****     |
+-------------------------------------------------------------------------+


From [e-mail] Mon 12 Jun 95 21:38:52
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cross Field Antenna Designs - Any Good?
Date: 12 Jun 1995 07:24:24 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 12
Message-ID: <3rgq38$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

Simon Lewis  <[e-mail]> wrote:
>Im looking at a design in the G QRP mag about a cross field antenna
>Do they work and has anyone tried this design (by their art editor)

Hi Simon,

I saw the design in the wireless world. It looks very much like an
aprils fools joke, I am surprized that the G-QRP mag bothers with it.
Try a wet shoe lace first.

73, Moritz DL5UH


From [e-mail] Mon 12 Jun 95 21:38:53
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Joseph Testa)
Newsgroups: rec.radio.amateur.homebrew
Subject: Does a 2 meter CW kit exist?
Date: 12 Jun 1995 07:48:54 -0400
Organization: The Greater Columbus Freenet
Lines: 20
Message-ID: <3rh9j6$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
X-Newsreader: TIN [version 1.2 PL2]


I am looking for either a kit or plans for building a 2M CW transceiver.

Looking at all modes(new) are too expensive(and only going to get worse) and
trying to find a used one is near impossible.  So I have started a mission
in search of.

Would appreciate any information that could be given.

Why does a 2M all mode cost as much (or more) than a low end HF rig
with multiple bands?

Thanx, 73, joe


--
Joseph S. Testa, Database Administrator, Ohio EPA
  N8XCT, Emergency Coordinator (EC) & Local Govt Liaison (LGL)
  Pickaway County, OH and Official Relay Station (ORS), message content
  are MY views and NOT my current employer.

From [e-mail] Mon 12 Jun 95 21:38:53
Path: grape.epix.net!news.sprintlink.net!simtel!col.hp.com!fc.hp.com!mckee
From: [e-mail] (Bret McKee)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Down East Microwave Converter
Date: 10 Jun 1995 21:50:36 GMT
Organization: Hewlett-Packard Fort Collins Site
Lines: 13
Message-ID: <3rd43c$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpmckee.fc.hp.com
X-Newsreader: TIN [version 1.2 PL1.4]

Brian Cieslak ([e-mail]) wrote:
: I am trying to trouble shoot my down  east Mode S receive converter but I
: ANy clues???

Have you called Down East?   I had a problem with power output on my Xverter,
and gave them a call.  Steve was very helpful, and I have nothing but good
things to say.

Bret

p.s. I am just a satisfied customer.  I have no financial stake in DEM
        and don't personally know anyone who works there.


From [e-mail] Mon 12 Jun 95 21:38:54
Path: grape.epix.net!news.sprintlink.net!pipex!demon!pacsat.demon.co.uk!slewis
From: Simon Lewis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrewer's magazine:  "Hambrew"
Date: 11 Jun 1995 02:41:34 +0100
Organization: None
Lines: 9
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dispatch.demon.co.uk
X-Newsreader: Newswin Alpha 0.7
X-Posting-Host: pacsat.demon.co.uk

Do you have an adress for them?

--
+-------------------------------------------------------------------------+
|  73 From:  Simon Lewis GM4PLM - Helensburgh - Strathclyde - Scotland    |
| Packet: GM4PLM @ GB7SAN.#78.GBR.EU   Email: [e-mail]   |
| AMSAT - UK Member 4282     **** SUPPORT YOUR LOCAL AMSAT GROUP ****     |
+-------------------------------------------------------------------------+


From [e-mail] Mon 12 Jun 95 21:38:55
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!tcsi.tcs.com!uunet!in1.uu.net!wb3ffv!hambbs!Mike.Czuhajewski
From: [e-mail] (Mike Czuhajewski)
Subject: Re: Homebrewer's magazine:  "Hambrew"
Sender: [e-mail] (Mike Czuhajewski)
Message-ID: <[e-mail]>
Date: Sun, 11 Jun 1995 19:56:38 GMT
Reply-To: [e-mail] (Mike Czuhajewski)
References: <[e-mail]>
X-Posting-Software: UniBoard 2.00beta2 S/N 329931
Organization: The WB3FFV Amateur Radio Internet BBS
Lines: 14

Wayne Burdick recently commented on Hambrew magazine, noting that it
was $10 a year, and hinting that we should take advantage of that
before they raise their price.  A little historical perspective:  it
started out at $20 a year, which I thought was quite steep for a small
quarterly publication.  It wasn't a bad little magazine, but I wasn't
about to shell out twenty dollars a year for it.  One reason for the
high cost was the publishers wanting to use very high quality paper.
He recently decided to go to a lesser quality paper (but still far
above newsprint in quality) and slashed the price to ten dollars a
year--at which point I finally subscribed.  I have no data on the
effects of the price reduction vs. subscriber base, but I would suspect
that he picked up a lot more subscribers when he did it.  And it still
remains a nice little homebrewers magazine worth looking into.  73 DE
WA8MCQ

From [e-mail] Mon 12 Jun 95 21:38:55
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!noc.netcom.net!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: How do you charge NiMh (not NiCd) cells?
Message-ID: <[e-mail]>
Organization: Organization? Me?
Date: Mon, 12 Jun 1995 20:29:40 GMT
Lines: 12
Sender: [e-mail]

I've found a source for AA-size Nickel Metal Hydride (NiMh) cells
(fyi DC ACE ELECTRONICS, Linconshire Il, 708 821 8122) and would like
to know how to recharge them. Have any sample circuits been published?
Any rules or recommendations? I'll be using them in a laptop computer
that takes AA cells.

Thanx,

73 Dave WB0GAZ [e-mail]

P.S., I have no dealings with the vendor above except having received their
flyer.

From [e-mail] Mon 12 Jun 95 21:38:56
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!mv!usenet
From: [e-mail] (Andy Borsa)
Subject: Re: LCCALC.EXE for RF tank ccts
Message-ID: <[e-mail]>
Nntp-Posting-Host: moose.mv.com
Sender: [e-mail] (System Administrator)
Mime-Version: 1.0
Organization: RF Design Consultant
Date: Sat, 10 Jun 1995 20:01:23 GMT
References: <3rajlu$[e-mail]>
X-Newsreader: WinVN 0.99.3
Lines: 13
Xref: grape.epix.net alt.radio.pirate:8476 sci.electronics:130459 rec.radio.amateur.homebrew:7719

In article <3rajlu$[e-mail]>,
[e-mail] says...
-  LC PC calc program info deleted

My calculator doesn't take 34K and takes a few seconds to get an answer,
plus I can use it anywhere, even in the can.  It's far more energy
efficient, exercises dormant brain cells, and makes me feel useful.  Why
would I want to be bothered with 50 pounds of computer?  Calc + brain <<
50 lbs & 100's of watts.

--
    Andy Borsa -- !!!The universe is discretely analog!!!


From [e-mail] Mon 12 Jun 95 21:38:57
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!pipex!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!usenet.eel.ufl.edu!news-feed-1.peachnet.edu!hobbes.cc.uga.edu!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Looking for an RF Ground expert?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sat, 10 Jun 1995 07:45:41 GMT
Lines: 30

In article <[e-mail]> [e-mail] (Robert Tetrault) writes:
>For
>example, at some hypothetical frequency, you may find that the so-called
>ground is actually a quarter wavelength, essentially an open circuit for
>RF...this is not a good thing...

Why is this not a good thing? Do you have some reason to want to heat
earthworms with your hard won RF?

>This setup, ideally, has such low impedance to earth ground that whatever
>impedances to ground presented by the house ground wires are shorted out,
>and don't matter.

What is the impedance of Earth?



Ok, I'm poking a little fun, but think about these questions anyway.
Why, in general, do you want to pump RF into the Earth? And just
how low impedance is Earth anyway? If it takes a Megger to read the
resistance between two points on Earth, how come our wire running to
Earth has to be so low impedance? The answers to those questions
can help explode some myths.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |

From [e-mail] Mon 12 Jun 95 21:38:58
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Spice-based Simulator
Date: Mon, 12 Jun 95 07:09:05 PDT
Organization: Northwest Nexus Inc.
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blv-pm1-ip30.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


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


>
> Boy, am I fussy or what?  Anyway, if there is a worthwhile version of
> spice out there, please let me know.  This news server has a habit of
> missing articles, so please email, or send me a copy of your posting by
> mail.
>
It seems to me that I just saw an announcement that Microsim had just
come out with, or lowered the price of, a low cost version of pspice that
sounded like it would do a great deal more than one op amp.

Also, Intusoft has a windows spice package for about $500 that looks very
interesting (with virtual scope, etc).  I haven't tried either package so
I can't give you and first hand experiences.

73 de KI7RH (Jay)




From [e-mail] Mon 12 Jun 95 21:38:58
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.cac.psu.edu!news.pop.psu.edu!hudson.lm.com!news.ysu.edu!yfn.ysu.edu!au156
From: [e-mail] (Hank Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Lunar 2 Meter Amp schematic and modification
Date: 12 Jun 1995 14:29:14 GMT
Organization: Youngstown State/Youngstown Free-Net
Lines: 27
Message-ID: <3rhivq$[e-mail]>
NNTP-Posting-Host: yfn2.ysu.edu


Does anyone have a schematic the following 2 meter amp that he could
make a copy of for me?

        Lunar Electronics Linearized Amplifier, Model 2M10-80P.
        (I guess that's 10 IN, 80 OUT, with a preamp.)

I bought this used, and haven't a stitch of printed info on it.
It's a little difficult to trace the  DS PCB without separating
the two boards from the heatsink, although I have a general idea
of what is happening.

What I would like to do is to disable the SSB linear bias on the
single transistor (SD1416), because the power drain seems to be
excessive compared to a plain old Class C transistor amp.  It has
an FM/SSB switch which I always thought took out the bias on these
types of PAs, but It seems to really just effect the T/R relay
lag time.

Incidentally, there is a 10 watt resistor that gets hot as a pistol
when transmitting for any length of time which must be part of the
linear bias network.  For ten RF watts out, the power drain is
something like 4 amps instead of about the 2 amps I'd expect for
a plain *FM only* PA.

Hank
N1LTV

From [e-mail] Mon 12 Jun 95 21:38:59
Path: grape.epix.net!news.sprintlink.net!demon!plug.news.pipex.net!pipex!howland.reston.ans.net!news.cac.psu.edu!news.pop.psu.edu!hudson.lm.com!newsfeed.pitt.edu!dbisna.com!psinntp!psinntp!psinntp!news.nyc.pipeline.com!news
From: [e-mail] (Dave Santoro)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Plans for an Eggbeater Antenna?
Date: Mon, 12 Jun 1995 14:41:24 GMT
Organization: HYY Inc.
Lines: 10
Message-ID: <3rhjn5$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dsantoro.nyc.pipeline.com
X-Newsreader: Forte Free Agent v0.55
Xref: grape.epix.net rec.radio.amateur.homebrew:7731 rec.radio.amateur.antenna:11033

Hey folks,

I'm looking to homebrew an eggbeater antenna for 2M.  If anyone could
post plans or direct me to a publication that has them I would greatly
appreciate it.

73
Dave N2VYP



From [e-mail] Mon 12 Jun 95 21:39:00
Path: grape.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!sierra.net!d223-brockway.sierra.net!user
From: [e-mail] (Robert Tetrault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: push-pull grounded screen.
Date: Sat, 10 Jun 1995 13:30:15 -0700
Organization: Engineered Solutions
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 204.94.234.223

Grounded screens address the need for a good RF ground at HF.  It does
mean reverse biassing the cathode to get the effecteive screen voltage
though the screen is at DC and RF ground.  The output C of a 4CX1000A tube
is doubled in Push-Pull, and probably you would not need any fixed or
variable plate Tune C, just a variable inductor with variable loading C.
I have seen output tanks that did this and used a compressible coil to
vary turns spacing to achieve variable L.

From [e-mail] Mon 12 Jun 95 21:39:00
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!quagga.ru.ac.za!marlin.upe.ac.za!usenet
From: Anton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: RTTY Decoder
Date: 12 Jun 1995 14:59:24 GMT
Organization: Zoology
Lines: 13
Message-ID: <3rhkoc$[e-mail]>
NNTP-Posting-Host: zoo92.upe.ac.za
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

As a yachtie we have access to maritime bands, from where important
weather information is obtained.  Paging through a Maplin catalogue I
came asross a CW & RTTY decoder by Waters & Stanton, a Microreader MK II.
 Is anyone currently operating one of these decoders or can supply
information on it?  I would like to decode RTTY weather broadcasts on 8 &
12 MHz (maritime frequencies). Will this decoder meet my needs? The
reason why I am interrested in this decoder is simply because it does not
seem to require a PC of any description to function.  This is the biggest
downfall of HamComm and Packet on a small yacht, as amps are scarce and
salt water gets in every where!
73
Anton


From [e-mail] Mon 12 Jun 95 21:39:01
Path: grape.epix.net!news.sprintlink.net!news.infi.net!usenet
From: [e-mail] (WA4UPL)
Newsgroups: rec.radio.amateur.homebrew
Subject: Vacuum Tubes Available...
Date: 12 Jun 1995 17:06:38 GMT
Organization: [e-mail] (WA4UPL)
Lines: 35
Message-ID: <3rhs6u$[e-mail]>
NNTP-Posting-Host: h-dreamscape.infi.net
X-Newsreader: WinVN 0.92.6

Subj:  VACUUM TUBES AVAILABLE
Date:  95-06-12 11:28:59 EDT
From:  Whit Gillon  (WA4UPL)

NEW  ELECTRON  TUBES

Following is a list of new electron tubes available immediately along with the unit price. Quantity orders are encouraged
 Shipping and COD charges extra. Minimum order $100.

Raytheon QKK-759A       $125.00
Raytheon 2K45           $25.00
Raytheon 6133           $25.00
Raytheon 2K28           $20.00
Raytheon 6115A          $20.00
Raytheon DOD-001        $20.00

Phillips 6SL7WGT        $1.70
Phillips 6C4WA          $ .60
Phillips 6CB6A          $ .50
Phillips 5749W          $ .50
Phillips 5750           $ .50

GE 6AK6                 $ .60
GE 6005W                $ .60
GE 6AV6                 $ .60
GE 6BF5                 $ .50

All tubes are new and in original boxes. To place order, e-mail ôwhit@ infi.netöwith the following information:

1. Name
2. Business Name
3. COD Shipping Address
4. Telephone Number
5. Quantity & Tube Number


From [e-mail] Thu 15 Jun 95 14:01:02
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!decwrl!purdue!news.bu.edu!transfer.stratus.com!usenet
From: "J.Swenson" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 14 Jun 1995 01:48:32 GMT
Organization: Stratus Computer Inc, Marlboro MA
Lines: 31
Message-ID: <3rlf5g$[e-mail]>
NNTP-Posting-Host: jswenson.hqsl.stratus.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1b3 (Windows; U; 16bit)

I am looking for a power transformer or its equivalent from a CV-157
which is an SSB/AFC unit for the R390A receiver. Originally made by The
Industrial Transformer Corporation of Gouldsboro PA.
Part # DP-7152 ,   Spec # TF1RX03YY,   Drawing # SM-D-180211.
Specs. as follows:Max temp rise 35'c, wkg vol.@700 max, primary 48-62 cps
Primary taps at 105,110,115,120,125,210,220,230,240  (will need 115vac)
Sec. 5v@4a with 375 wkg v., 1000v CT (2@500v/250ma), 6.3v@2.5a,
6.3v@1.25a,
400v CT (2@200v/30ma)with 500 wkg.v.and 6.3v@16.5a
(see diagram below if it comes out)


pin#      1    2     3     4     5     6       7     8     9    10    11
          !    !     !     !     !     !       !     !     !     !     !
primary   C   105v  110v  115v  120v  125v    210v  220v  230v  240v 250v
  vac
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
-------------------------------------------------------------------------
_________________________________________________________________________
^^^^^^    ^^^^^^^^^^^^^^^   ^^^^^^   ^^^^^^^    ^^^^^^^^^^^^^^^   ^^^^^^
!5v-4a !   ! 500v ! 500v !   !6.3v!   !6.3v !    ! 200v ! 200v !  !6.3v !
! 375  !   ! rms  !  rms !   !2.5a!   !1.25a!    ! rms  ! rms  !  !  !  !
!wkg v.!   !    250ma    !   !    !   !     !    !     30ma    !  !16.5a!
!      !   !      !      !   !    !   !     !    ! wkg. v. 500 !  !  !  !
!      !   !      !      !   !    !   !     !    !      !      !  !  !  !
12    13   14    15     16   17  18   19   20    21     22    23 24 25 26

The working voltage seems to be the maximum dc across these windings.
Thanks in advance for any help you may give me in locating this unit.



From [e-mail] Thu 15 Jun 95 14:01:03
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!netnews.lightside.com!user52.lightside.com!user
From: [e-mail] (John Fay)
Newsgroups: rec.radio.amateur.homebrew
Subject: **1ST EVER HAM OPINION POLL, NOW ON THE WEB**
Date: Wed, 14 Jun 1995 00:00:13 +0100
Organization: Elf. Ent.
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: user52.lightside.com
Mime-Version: 1.0
Content-Type: text/plain;charset=US-ASCII
Content-Transfer-Encoding: 7bit

I have estalished a WWW site that includes the 1st ever Ham opinion poll.
The question this month is "Do you support the new vanity call program,
about to go into effect in the US?" The poll takes into account license
class and the age of the voter. Your vote is tallied instintly and you see
the results on-line.
Check this site out at, http://www.csz.com/sarrio.html.

From [e-mail] Thu 15 Jun 95 14:01:04
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!network.ucsd.edu!news-mail-gateway
From: [e-mail] (Jim Stafford-W4QO)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2M CW Kit/Rig Question
Date: 15 Jun 95 15:09:00 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I would suggest that you look for an AMECO TX-62 transmitter at hamfests.
They turn up quite regularly here in Atlanta.  And I have seen them in the
Yellow Sheets.  They go for about $30 to 50 bux and run about 35 watts
output.  If you can find the matching VFO, you have it made, otherwise you
would need to build one or use crystals.  Definitely usable on OSCAR, etc.
The parts in these things are worth much more than the price they are
commanding.

73/72/jim/w4qo


From [e-mail] Thu 15 Jun 95 14:01:04
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JSchmoe21)
Newsgroups: rec.radio.amateur.homebrew
Subject: 900 MHZ Cordless Freqs
Date: 13 Jun 1995 17:01:55 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <3rkuc3$[e-mail]>
Reply-To: [e-mail] (JSchmoe21)
NNTP-Posting-Host: newsbf02.mail.aol.com

I've heard about a range of frequencies allocated for personal use
(cordless phones, remote controls, etc.) within one's own house on limited
power. I wanted to know if there was a way to build my own equipment on
such bands.

Interesting possibilities might include homebrew cordless phones, possible
ways to put your xmitter closer to the antenna by having a remote control
full-duplex repeater in your hand where you like to work.

Post some stuff up if you have any ideas. Thanks.

From [e-mail] Thu 15 Jun 95 14:01:05
Path: grape.epix.net!news.sprintlink.net!simtel!news1.oakland.edu!detroit.freenet.org!detroit.freenet.org!af104
From: [e-mail] (Jeffrey L. Bauman)
Newsgroups: rec.radio.amateur.homebrew
Subject: CHECK YOUR RELAY PILE!
Date: 13 Jun 1995 13:45:55 GMT
Organization: The Greater Detroit Free-Net
Lines: 25
Message-ID: <3rk4qj$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


Looking for the following relay:

Potter & Brumfield R10-E1Y4-J10.0K

This is 4PDt current-actuated relay with
a 10,000 ohm coil.  Also need socket.

This relay will replace a P&B MH-3665-1
relay with similar characteristics,
manufactured for Hallicrafters in 1958
for use as a changeover relay in the
HT-32A.

Obviously, a MH-3665-1 would be just
fine too!

Socket also need if appropriate.

Thanks!

--
Jeff
WB5KZW
(810)-855-9209 (Near Detroit)

From [e-mail] Thu 15 Jun 95 14:01:06
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!noc.netcom.net!ix.netcom.com!netcom.com!ghiscox
From: [e-mail] (George L. Hiscox)
Subject: Re: CHECK YOUR RELAY PILE!
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
References: <3rk4qj$[e-mail]>
Date: Tue, 13 Jun 1995 16:40:10 GMT
Lines: 22
Sender: [e-mail]

Jeffrey L. Bauman ([e-mail]) wrote:

: Looking for the following relay:
:
: Potter & Brumfield R10-E1Y4-J10.0K
:
: This is 4PDt current-actuated relay with
: a 10,000 ohm coil.  Also need socket.
:

Jeff,
        How about just buying one from Potter & Brumfield Inc., Richland
Creek Drive, Princeton, IN 47670   phone [phone] or fax (812)
386-2289.
        They may provide you with the address of a distributor in your
area where you can go or perhaps you can order one direct.
        Good luck!

| George L. Hiscox                |  Very funny Scotty...Now  |
| [e-mail]              |  beam down my clothes!!!  |
| WA6RIK @ WB6YMH.#soca.ca.usa.na |  ^^^^^^^^^^^^^^^^^^^^^^^  |


From [e-mail] Thu 15 Jun 95 14:01:07
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!apollo.hp.com!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Cross Field Antenna Designs - Any Good?
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Tue, 13 Jun 1995 11:39:47 GMT
References: <3rgq38$[e-mail]>
Nntp-Posting-Host: hpqmocc.sqf.hp.com
Organization: Hewlett-Packard LTD, South Queensferry, Scotland
X-Newsreader: TIN [version 1.1 PL8.8]
Lines: 57

[e-mail] wrote:

: I saw the design in the wireless world. It looks very much like an
: aprils fools joke,

    It does, doesn't it. Believe me, the people who originated it take
it very seriously indeed and spent a lot of time and money on patenting
it. Whether it works effectively is a separate question.

    The idea of simultaneously generating E and H fields is perfectly
valid. Conventional antennae generate one component field predominantly
and the other develops as the field propagates through space. An antenna
that really did create both would simply have no "near field" region
with unbalanced E and H components.

    So far so good.  There is nothing that makes this *implicitly*
inefficient, or troublesome. Where I have doubts are:

    Does this have any influence on antenna size versus frequency?
    Does it permit directional concentration from small structures?
    Are the field generators efficient ?


    From having seen demos and having had a close look at them, my chief
concern is with the effectiveness of the interface between a 50 Ohm coax
environment and capacitive structures. I suspect that this area could
easily spoil the performance of the whole thing, and it would be easy
but erroneous to interpret this as invalidating the basic principle.
    Synopsis: the basic principle is novel, interesting and deserves
thorough investigation, but I feel the implementation of the things so
far seen in print leaves room for much further development.


:I am surprized that the G-QRP mag bothers with it.

   George is open to publishing just about anything in Sprat, there is
no heavy technical vetting, though he does sometimes mail stuff to
various people with "What do you think about this..." notes attached
   While this openness means that readers have to be selective, it
provides a channel for occasional odd ideas and unusual approaches that
can stimulate new ideas


   I didn't take the tin can CFA seriously when I saw it in Sprat, I
found it amusing, but guessed that you could likely get comparable
results by tuning up to a wire coat hanger.


: Try a wet shoe lace first.

   Probably not far off some of the oddball antennae ;-)


   Cheers
          David  GM4ZNX



From [e-mail] Thu 15 Jun 95 14:01:09
Path: grape.epix.net!news.sprintlink.net!qns3.qns.com!news.ecn.uoknor.edu!constellation!bubba.ucc.okstate.edu!gcouger
From: [e-mail] (Gordon Couger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cross Field Antenna Designs - Any Good?
Date: 13 Jun 1995 02:58:15 GMT
Organization: Biosystems and Agricultural Engineering
Lines: 24
Message-ID: <3rius7$[e-mail]>
References: <[e-mail]> <3rgq38$[e-mail]>
Reply-To: Gordon Couger <[e-mail]>=
NNTP-Posting-Host: jsun.agen.okstate.edu

In article <3rgq38$[e-mail]>,
 <[e-mail]> wrote:
>Simon Lewis  <[e-mail]> wrote:
>>Im looking at a design in the G QRP mag about a cross field antenna
>>Do they work and has anyone tried this design (by their art editor)
>
>I saw the design in the wireless world. It looks very much like an
>aprils fools joke, I am surprized that the G-QRP mag bothers with it.
>Try a wet shoe lace first.
>
I followed the whole thing over about a year. As I recall no one could
duplicate the results. WW would print some stuff that was a one time
non repeatable event.

Some where I have a copy of one of their articals that observed signals
traveling at greater than the speed of light. I talked with an EE of
considerable reputation that thought that it was possible that two
converging signals could produce a phase front that exceeded the speed
of light.

Gordon
Gordon Couger - 624 Cheyenne, Stillwater, OK 74075
[e-mail] 405-624-2855 evenings
    I do not speak for my employer

From [e-mail] Thu 15 Jun 95 14:01:09
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cross Field Antenna Designs - Any Good?
Date: 13 Jun 1995 17:42:12 GMT
Organization: Hewlett-Packard
Lines: 25
Message-ID: <3rkilk$[e-mail]>
References: <[e-mail]> <3rgq38$[e-mail]> <3rius7$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <3rius7$[e-mail]>,
Gordon Couger <[e-mail]> wrote:
>
>Some where I have a copy of one of their articals that observed signals
>traveling at greater than the speed of light. I talked with an EE of
>considerable reputation that thought that it was possible that two
>converging signals could produce a phase front that exceeded the speed
>of light.
>Gordon

PHASE VELOCITY <> GROUP VELOCITY!

In waveguide, phase velocity is always greater than the speed of light
in the medium in the waveguide (usually air), and approaches infinity
at the cutoff frequency.  This has nothing to do with violating the
law of relativity.

Imaging a wave in the ocean moving at 10 MPH hitting a straight
beach at almost perpendicular incidence.  The wavefront will "move"
along the beach at hundreds of MPH.  But the wavefront is a mathematical
abstraction, not a physical object, so the swimmers are in no danger
of being swept away in a tidal wave.

Rick Karlquist N6RK
[e-mail]

From [e-mail] Thu 15 Jun 95 14:01:10
Path: grape.epix.net!news.sprintlink.net!demon!pacsat.demon.co.uk!slewis
From: Simon Lewis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cross Field Antenna Designs - Any Good?
Date: 13 Jun 1995 19:51:17 +0100
Organization: None
Lines: 27
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]> <3rgq38$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dispatch.demon.co.uk
X-Newsreader: Newswin Alpha 0.7
X-Posting-Host: pacsat.demon.co.uk

In article: <3rgq38$[e-mail]>  [e-mail]
() writes:

> I saw the design in the wireless world. It looks very much like an
> aprils fools joke, I am surprized that the G-QRP mag bothers with it.
> Try a wet shoe lace first.
>
> 73, Moritz DL5UH
>
>
>

Hmmmmm I wouldnt write it off that quick! A commerical company here in the UK has patented
the ideas and is marketing a commerical version.

I also spoke to the author and he swears by it! Uses nothing else and he sent me a photocopy
of a qsl card for an 80m g-vk qso he had on it (supposedly) - so i aint too sure yet!



--
+-------------------------------------------------------------------------+
|  73 From:  Simon Lewis GM4PLM - Helensburgh - Strathclyde - Scotland    |
| Packet: GM4PLM @ GB7SAN.#78.GBR.EU   Email: [e-mail]   |
| AMSAT - UK Member 4282     **** SUPPORT YOUR LOCAL AMSAT GROUP ****     |
+-------------------------------------------------------------------------+


From [e-mail] Thu 15 Jun 95 14:01:11
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Does a 2 meter CW kit exist?
Date: 12 Jun 1995 17:16:41 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 14
Message-ID: <3rhspp$[e-mail]>
References: <3rh9j6$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

In article <3rh9j6$[e-mail]>,
Joseph Testa <[e-mail]> wrote:
>Looking at all modes(new) are too expensive(and only going to get worse) and
>trying to find a used one is near impossible.

Well, thereis the Yaesu FT290R. Not that it is a particularly
good rig, but they sell here s/h at reasonable prices.

As to building, there was in the VHF-UHF Manual from the RSGB
a direct conversion receiver. This might be a starting point.

73, Moritz DL5UH



From [e-mail] Thu 15 Jun 95 14:01:12
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.starnet.net!wupost!news.utdallas.edu!corpgate!bcarh189.bnr.ca!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ae517
From: [e-mail] (Russ Renaud)
Subject: Re: Does a 2 meter CW kit exist?
Message-ID: <[e-mail]>
Sender: [e-mail] (Russ Renaud)
Reply-To: [e-mail] (Russ Renaud)
Organization: The National Capital FreeNet
References: <3rh9j6$[e-mail]>
Date: Tue, 13 Jun 1995 12:15:39 GMT
Lines: 17


Joseph Testa ([e-mail]) writes:
> I am looking for either a kit or plans for building a 2M CW transceiver.
>
> Looking at all modes(new) are too expensive(and only going to get worse) and
> trying to find a used one is near impossible.  So I have started a mission
> in search of.
>
> Would appreciate any information that could be given.
>
Kanga US sells the KK7B single signal direct converstion stuff as either just
boards or complete kits.  You *could* make a 2 metre CW/SSB transceiver
with those.  I've been thinking about building one up myself.

I think Kanga's URL is http://ncc1701-d.cc.nd.edu/kanga/.

Russ, va3rr/aa8lu

From [e-mail] Thu 15 Jun 95 14:01:13
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!w9sz
From: [e-mail] (Zack Widup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Does a 2 meter CW kit exist?
Date: 15 Jun 1995 13:55:44 GMT
Organization: University of Illinois at Urbana
Lines: 36
Message-ID: <3rpe50$[e-mail]>
References: <3rh9j6$[e-mail]>
Reply-To: [e-mail] (Zack Widup)
NNTP-Posting-Host: firefly.prairienet.org


In a previous article, [e-mail] (Joseph Testa) says:

>
>I am looking for either a kit or plans for building a 2M CW transceiver.
>
>Looking at all modes(new) are too expensive(and only going to get worse) and
>trying to find a used one is near impossible.  So I have started a mission
>in search of.
>
>Would appreciate any information that could be given.
>
>Why does a 2M all mode cost as much (or more) than a low end HF rig
>with multiple bands?
>
>Thanx, 73, joe
>
>
>--
>Joseph S. Testa, Database Administrator, Ohio EPA
>  N8XCT, Emergency Coordinator (EC) & Local Govt Liaison (LGL)
>  Pickaway County, OH and Official Relay Station (ORS), message content
>  are MY views and NOT my current employer.
>

Hi,
        You didn't say how much you are willing to spend.
        A real performer is the KK7B R2/T2 combination built for 2
meters. The R2 design was in January 1993 QST. (Receiver board).
The T2 design was in April 1993 QST (Xmtr board). An article which gives
circuits for VFO's for 2 meters and how to put it all together was in May
1993 QST (All by Rick Campbell KK7B.)
        This will get you on 2 meter CW and SSB.
        I think mine cost about $150 all together.

                                        73, Zack W9SZ

From [e-mail] Thu 15 Jun 95 14:01:14
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!geraldo.cc.utexas.edu!slip-25-15.ots.utexas.edu!bsn
From: Barry Newberger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: EPROM Burner
Date: 14 Jun 1995 04:24:57 GMT
Organization: UT-Austin
Lines: 9
Distribution: world
Message-ID: <3rloap$[e-mail]>
NNTP-Posting-Host: slip-2-32.ots.utexas.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Newsreader: Nuntius 2.0.4_68K
X-XXMessage-ID: <[e-mail]>
X-XXDate: Tue, 13 Jun 1995 04:24:48 GMT

I'm interested in building an EPROM burner and if anyone
knows of a nice "roll your own" design I would appreciate
hearing about it.  One with a serial interface would be
icing on the cake.

Please reply to my e-mail address: [e-mail]

Thanks,
Barry Newberger

From [e-mail] Thu 15 Jun 95 14:01:15
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!nntp.crl.com!crl11.crl.com!not-for-mail
From: [e-mail] (Niles Stacey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: EPROM Burner
Date: 14 Jun 1995 00:19:43 -0700
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 19
Distribution: world
Message-ID: <3rm2if$[e-mail]>
References: <3rloap$[e-mail]>
NNTP-Posting-Host: crl11.crl.com
X-Newsreader: TIN [version 1.2 PL2]

Barry Newberger ([e-mail]) wrote:
: I'm interested in building an EPROM burner and if anyone
: knows of a nice "roll your own" design I would appreciate
: hearing about it.  One with a serial interface would be
: icing on the cake.

: Please reply to my e-mail address: [e-mail]

: Thanks,
: Barry Newberger

There was a good article in either QST or QEX a few years back.  Sorry
that I can't put my finger on it.  Most of my old issues go to the newer
hams in our area.  Perhaps someone can recall which issue.

Good luck,

N6ZVZ


From [e-mail] Thu 15 Jun 95 14:01:16
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!nntp.crl.com!decwrl!olivea!sfgw!usenet
From: [e-mail] (Roberto VALFREDINI)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Faxmodem f. JVFAX
Date: 14 Jun 1995 06:29:34 GMT
Organization: Ing . C. OLIVETTI  S.p.A. Ivrea Italy
Lines: 46
Distribution: world
Message-ID: <3rlvke$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 131.1.165.215
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

In article <[e-mail]>, [e-mail]
says...
>
>
>Hallo Roland !
>
>Ich habe mir vor kurzem Platinen und Eprom zu dem von
>Dir und Ulrich entwickelten Faxmodem bestellt.
>Nach dem Zusammenbau der Platine pruefte ich zunaechst
>den Daten/Adressbus mittels eines NOP-Steckers. Alle
>Ausgaenge lieferten Signale, kein Signal war "doppelt".
>Soweit so gut.
>.........................
...........................


Dear Sir,
if you want to speak to Mr. Roland I THINK YOU could send to him
a mail .
Otherwise using the newsgroup I suggest you to you to write in a language
that can be understood by the most of the people here aroud .
I am Italian BUT I never write in italian here because I realize
that only a very few people can understand it.
If you wrote in english most of the people here can take advantage
from your ideas , opinions or experiences

I could be wrong I could be right this is just my opinion Klaus.

regards

Roberto VALFREDINI




-------------------------------------------------------------------------
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Ing. C. Olivetti S.p.A takes no responsibility for the views expressed in
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-------------------------------------------------------------------------
                      A T T E N Z I O N E
La Ing C. OLIVETTI S.p.A. non assume nessun tipo di reponsabilita' sulle
opinioni espresse in questa posta. Esse sono opinioni personali dell' uti
lizzatore coinvolto.
-------------------------------------------------------------------------


From [e-mail] Thu 15 Jun 95 14:01:17
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!pacbell.com!nntp-hub2.barrnet.net!news3.near.net!eisner!cloutier
From: [e-mail] (Steve Cloutier - Notes 'R Us)
Newsgroups: rec.radio.amateur.homebrew
Subject: High Efficiency MOSFET HF Transmitter
Message-ID: <1995Jun14.125209.10242@eisner>
Date: 14 Jun 95 12:52:09 -0400
Organization: DECUServe
Lines: 68

First, hello and all. This is my first time in this news group.

I'm curious if there are any fellow readers out there who are interested
in building high efficiency solid state or low impedance tube transmitters
for HF?

If anyone has built such a transmitter, I'd like to know your experiences.


I have just recently completed a 180 Watt (input) solid state transmitter
for 75 and 160 meters.  It uses the cheap IRF610 power mosfet (cost of between
.75 and $1.00 each).  The transmitter uses 18 such fets in a totum pole
arrangement.

The efficiency is achieved by running the MOSFETs as switches and keeping the
rise and fall times very low (10ns typical).


Currently, this is set up for AM, and I'm  modulating  the final with
6 IRF620 Mosfets set up as a Pulse Width Modulator.  If you're not familiar
with a Pulse Width Modulator, it's simply a highly efficient series
modulator.  It's standard AM at the output.


I'm getting around 90% efficiency. I'm using standard TTL throughout, with
some Mosfet drivers (from motorola, .60 each) to achieve the higher voltage
(10 V) needed to drive the gates of the MOSFETS.

The transmitter is very simple.  So is the modulator.  The transmitter uses
no oddball ferrite transformers and the output network is a standard
L-PI network built with broadcast variable capacitors and air core coils.


While this transmitter is interesting and all, I don't think I could get
the thing up above 75 meters using this design (switching at RF to get high
efficiency).  MOSFETs have a fairly high input capacitance, and a high
reverse transfer capacitance which increases dramatically when the Fet is
in saturation mode.

It is quite practical to drive these Fets as a linear amplifier, but that
would be highly inefficient.


I'v been thinking about building a similar transmitter using the 6C33C-B
triode.  This tube is a very low impedance device (around 100 ohms), and
should easily do 300 volts at 600mA per tube.  Given that, it would be
farily easy to build a KW transmitter with 5 or 6 of these tubes.

I'd run 300 volts at 3.3 amps or thereabouts.  It could be easily modulated
by power mosfets set up in a Pulse Width Modulator.

I suspect it will take around 100 volts (RF) to drive it into saturation.
I'd probably use a couple Mosfets in totum pole to drive the grid with
square waves.  I'v achieved 90% plate efficiency tubes in the past, buy using
square wave drive, and turning the tube on hard.


Anyone had any experience with the 6C33C-B, or for that matter with
using MOSFETs as RF switches.

One parameter I can't seem to find for the 6C33C-B is the maximum grid
dissipation.


Regards,
        Steve KA1SI (Northern Mass).



From [e-mail] Thu 15 Jun 95 14:01:18
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!lll-winken.llnl.gov!decwrl!olivea!rahul.net!a2i!sierra.net!d225-brockway.sierra.net!user
From: [e-mail] (Robert Tetrault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: High intercept, low noise amp - wanted.
Date: Wed, 14 Jun 1995 16:08:33 -0700
Organization: Engineered Solutions
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 204.94.234.225

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

> I have recently discovered the Motorola MRF-136 has a 1dB noise figure
at 175MHz
> and an output power of 15W, so the intercept should be about +50dBm.
However, the
> test circuit given in the data book at 175MHz uses a stabilising resistor of
> 27 ohms between gate (its a FET) and earth, which I'm sure wont give the
NF I want.
> I'll contact Motorola and ask if they can give me the circuit which gave
1dB NF.
>
Motorola in the same source depicts the low noise circuit, which is a
narrow band amp.  Recent articles in QST (last three years, by Mahkinson
and Ulrich Rhodes, et al) describe broadband 50 Ohm I/O low noise amps
with high intercepts (approx 45 dBm) that are bipolar and have not the
high current consumption of the Motorola FET.

From [e-mail] Thu 15 Jun 95 14:01:19
Path: grape.epix.net!news.sprintlink.net!demon!pacsat.demon.co.uk!slewis
From: Simon Lewis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrewer's magazine:  "Hambrew"
Date: 13 Jun 1995 19:51:21 +0100
Organization: None
Lines: 9
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>  <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dispatch.demon.co.uk
X-Newsreader: Newswin Alpha 0.7
X-Posting-Host: pacsat.demon.co.uk

Wheres the bloody address!!!! Ahhhhhhhhhhhhhhhhhh!!!! (English Humour!!)

--
+-------------------------------------------------------------------------+
|  73 From:  Simon Lewis GM4PLM - Helensburgh - Strathclyde - Scotland    |
| Packet: GM4PLM @ GB7SAN.#78.GBR.EU   Email: [e-mail]   |
| AMSAT - UK Member 4282     **** SUPPORT YOUR LOCAL AMSAT GROUP ****     |
+-------------------------------------------------------------------------+


From [e-mail] Thu 15 Jun 95 14:01:20
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!fred.interval.com!burdick.interval.com!user
From: [e-mail] (wayne burdick)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrewer's magazine:  "Hambrew"
Date: Wed, 14 Jun 1995 12:23:31 -0800
Organization: interval research
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]>  <[e-mail]> <[e-mail]>
NNTP-Posting-Host: burdick.interval.com

 [e-mail] wrote:

> Wheres the bloody address!!!! Ahhhhhhhhhhhhhhhhhh!!!! (English Humour!!)

And I, acknowledging my omission, replied:

Hambrew
POB 260083
Lakewood, CO 80226-0083

[phone]
[e-mail]

Wayne, N6KR

From [e-mail] Thu 15 Jun 95 14:01:21
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!pacbell.com!ohlone.kn.pacbell.com!jlundgre
From: [e-mail] (John Lundgren)
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: LCCALC.EXE for RF tank ccts
Followup-To: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Date: 13 Jun 1995 06:44:46 GMT
Organization: Pacific Bell Knowledge Network
Lines: 44
Message-ID: <3rjc4u$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 192.216.139.46
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net alt.radio.pirate:8499 sci.electronics:130795 rec.radio.amateur.homebrew:7740


Andy Borsa ([e-mail]) wrote:
: In article <3rajlu$[e-mail]>,
: [e-mail] says...
: -  LCCALC.EXE program info deleted

: My calculator doesn't take 34K and takes a few seconds to get an answer,
: plus I can use it anywhere, even in the can.  It's far more energy
: efficient, exercises dormant brain cells, and makes me feel useful.  Why
: would I want to be bothered with 50 pounds of computer?  Calc + brain <<
: 50 lbs & 100's of watts.

: --
:     Andy Borsa -- !!!The universe is discretely analog!!!


Well, Ok, go ahead and be a spoilsport.  Some of us don't have
programmable calcs and don't know the formula, and are constantly on
their computer anyway, so it's no big thing to run it.  Others just love
their H-P 48..  BWTW, most of the newer computers take less than 100
watts, especially if they're energy star compliant.  And if you've got a
little H-P palmtop PC, then this program is for you.  They run off a
couple AA cells.

Nice thing about a PC is that you can use it in a dark room.  If you have
one of those solar scientific calcs, then you better have a good source of
light to keep it running, and to make the display visible.

I heard on Bill Nye the Science Guy that brain cells never go dormant,
since they never grow or die.  If so, then they are never replaced.

I gotta go over to the comp.binaries.ibm.pc newsgroup and see if it's
finally over there.  Might be the moderator is asleep at the wheel.
Maybe I'll have to upload it to the ftp.ee.ualberta.ca site instead.

--
=====================================================================
|     John Lundgren - Elec Tech - Info Tech Svcs        | Standard  |
|     Rancho Santiago Community College District        | disclaim- |
|     17th St. at Bristol \ Santa Ana, CA 92706         | ers apply.|
|            [e-mail]               |(blah-blah)|
| "He who toys with the most dies, wins."- Dr Kevorkian?|  . . . .  |
=====================================================================


From [e-mail] Thu 15 Jun 95 14:01:22
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!netmbx.de!unlisys!news.maz.net!cls.net!deceiver!kbbs.org!hp
From: [e-mail] (Holger Petersen)
Subject: Re: LCCALC.EXE for RF tank ccts
Message-ID: <[e-mail]>
Organization: We don't need no organisation
Date: Wed, 14 Jun 1995 16:11:19 GMT
References: <3rajlu$[e-mail]> <[e-mail]>
Lines: 66
Xref: grape.epix.net alt.radio.pirate:8516 sci.electronics:131044 rec.radio.amateur.homebrew:7772

[e-mail] (Andy Borsa) writes:

>In article <3rajlu$[e-mail]>,
>[e-mail] says...
>-  LC PC calc program info deleted

>My calculator doesn't take 34K and takes a few seconds to get an answer,

here is my quick-hack-BASIC-Version:

5 REM Frequency - Inductance - Kapacity - Calculator
6 REM put into public domain by dg3lp
7 REM ----------------------------------------------
10 PRINT"Enter any two values > 0 and the third will be calculated"
20 PRINT"Quit by giving 2 or three values == 0"
25 PRINT
30 Pi = 3.14159
40 INPUT"Frequency   : ";Freq
50 INPUT"Inductance  : ";Indu
55 INPUT"Kapacity    : ";Kapa
60 PRINT" --- running ---"
70 IF Freq = 0 THEN 100
80 IF Indu = 0 THEN 200
90 IF Kapa = 0 THEN 300
95 PRINT"One input must be 0!"
99 GOTO 10
100 REM F = 0
110 IF(Kapa = 0) OR (Indu = 0) THEN 999
120 w = SQR(1/(Kapa*Indu))
130 Freq = w/(2*Pi)
140 GOTO 900
200 REM Ind = 0
210 IF(Kapa = 0) OR (Freq = 0) THEN 999
220 w = 2*Pi*Freq
230 Indu = 1/(Kapa*w*w)
240 GOTO 900
300 REM kapa = 0
310 IF(Indu = 0) OR (Freq = 0) THEN 999
320 w = 2*Pi*Freq
330 Kapa = 1/(Indu*w*w)
340 GOTO 900
900 REM Output
910 PRINT"===================="
920 PRINT"Frequence       : ",Freq
930 PRINT"Inductance      : ",Indu
940 PRINT"Kapacitance     : ",Kapa
950 PRINT"===================="
960 PRINT
970 GOTO 10
999 PRINT"Bye!" : STOP

This version runs on TURBO Basic (DOS) as well unde LINUX ChipMunk-BASIC.

>plus I can use it anywhere, even in the can.

My Linux-Box is too big to take it everywhere...

Please explain the second part ("... even in the can") to me; my english
is not so good to grasp the joke.
But it reminds me of a (sort of) limerick from an old scollbook:

 A canner can can
 everything he can can
 but can a canner can a can?

greetings, Holger

From [e-mail] Thu 15 Jun 95 14:01:23
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!msunews!news.gmi.edu!zombie.ncsc.mil!admaix.sunydutchess.edu!ub!news.kei.com!ddsw1!indep1!clifto
From: [e-mail] (Clifton T. Sharp)
Subject: Re: Lonely Lily - Still Alive!
Message-ID: <[e-mail]>
Organization: as little as possible
References: <3ri3te$[e-mail]>
Date: Wed, 14 Jun 1995 00:16:33 GMT
Lines: 17

PLEASE note the FORGERY!
                                            vvvvvvvvvvvvvvvvvvvvvvvvvv
In article <3ri3te$[e-mail]> [e-mail] (Sylvia Wong) writes:

As you can see from the References: line above, this article originated
on asiaonline.net, not on ocunix.on.ca.

>No e-mail please.

She doesn't mean it. [e-mail] needs a few copies of the source code
to KA9Q and she doesn't have an unzip program. Help her out. She'll have
better things to do than slow spams.

--
   Cliff Sharp                  Never get into fights with ugly people.
     WA9PDM                      They have nothing to lose.
  [e-mail]       --The Fourth Law of Reality

From [e-mail] Thu 15 Jun 95 14:01:24
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!uunet!in1.uu.net!nwfocus.wa.com!cleese.nas.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for an RF Ground expert?
Date: 12 Jun 1995 04:05:16 GMT
Organization: Network Access Services
Lines: 40
Message-ID: <3rgeds$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 199.165.149.208
X-Newsreader: AIR News 3.X (SPRY, Inc.)

>   [e-mail] (Robert Tetrault) writes:
>  Sorry I didn't reply directly to your request for advice; you'd have the
>  info more directly.
>
>  It's OK to have your power grounds from peripheral equipment and even RF
>  equipment going back to the neutral bus of your house wiring.  That third
>  gounding plug on the power plug does serve a purpose, for safety's sake.
>
>  For RF sake, it is not desirable to use these connections for RF ground as
>  the grounds have a definite and uncontrolled inductance that can make your
>  RF equipment behave strangely at times depending on the frequency.  For
>  example, at some hypothetical frequency, you may find that the so-called
>  ground is actually a quarter wavelength, essentially an open circuit for
>  RF...this is not a good thing...
>
>  The classic shack in the attic is likely to suffer more than the classic
>  basement location for obvious reasons.
>
>  What you want is, ideally, some broad strip (~12 inches) of solderable
>  metal running along behind -all- your equipment that can accept a short
>  direct physical connection to each piece of equipment.  This broad strip
>  is then connected to a physical earth ground as directly as possible, even
>  using flat braid or one inch copper strip.  You can buy grounding rods
>  from a building supply for the purpose, they are copper plated steel (so
>  you can hammer on them).  If you can't solder to the connections, make
>  them as robust as possible.
>
>  This setup, ideally, has such low impedance to earth ground that whatever
>  impedances to ground presented by the house ground wires are shorted out,
>  and don't matter.
>
>  You could also build a Faraday cage, but that is a house of another color...
>
>>>>
       since there is no such thing as true ground, a true RF ground expert will
    be hard to find.  A tuned ground system or counterpoise is useful if your
    intent is in radiating energy (an antenna system), but if the efforts are in
    an attempt to reduce the evils of loose RF energy, RFI and its cousins,
    the material above are very good practices.       W7LTQ


From [e-mail] Thu 15 Jun 95 14:01:25
Path: grape.epix.net!news.sprintlink.net!news.oz.net!news.lei.net!coconut!rahul.net!a2i!sierra.net!d225-brockway.sierra.net!user
From: [e-mail] (Robert Tetrault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Spice-based Simulator
Date: Wed, 14 Jun 1995 16:25:53 -0700
Organization: Engineered Solutions
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 204.94.234.225

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

I myself strongly recommend the version of SPICE produced by Spectrum
Software in Silicon Valley, 408 738 4387, fax [phone].  It is
available for all versions of PC and Power PC, and the eval version is
only 250 USDollars, runs 25 nodes, full function, and FAST!

From [e-mail] Thu 15 Jun 95 14:01:26
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!sdd.hp.com!hplabs!hplextra!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Spice-based Simulator
Date: 15 Jun 1995 16:48:04 GMT
Organization: Hewlett-Packard
Lines: 22
Message-ID: <3rpo84$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
Robert Tetrault <[e-mail]> wrote:
>In article <[e-mail]>, Jay
>Wicklund <[e-mail]> wrote:
>
>I myself strongly recommend the version of SPICE produced by Spectrum
>Software in Silicon Valley, 408 738 4387, fax [phone].  It is
>available for all versions of PC and Power PC, and the eval version is
>only 250 USDollars, runs 25 nodes, full function, and FAST!

It's called "Microcap" by Spectrum Software in Sunnyvale, CA (which is
in Silicon Valley, if not the capital of such!).

This is a great program I have been using for years.  I know many other
happy users.  It is much easier to use than Intuit IS-Spice or Microsim P-Spice.
That is why they can get $250 for it, while P-Spice gives away their
eval version (you get what you pay for).  If your time is worth anything,
get Microcap.  If you're a starving student who never sleeps, get P-Spice
for free off the net.

Rick Karlquist, N6RK
[e-mail]

From [e-mail] Thu 15 Jun 95 14:01:27
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Date: 13 Jun 1995 02:18:09 GMT
Organization: News & Observer Public Access
Lines: 30
Message-ID: <3rish1$[e-mail]>
References: <3r4qj0$[e-mail]> <3r8cvq$[e-mail]> <3r8tq4$[e-mail]> <3rb0kq$[e-mail]> <3rguc3$[e-mail]>
NNTP-Posting-Host: grail808.nando.net
Xref: grape.epix.net rec.radio.amateur.antenna:11051 rec.radio.amateur.homebrew:7739 rec.radio.amateur.misc:80667 rec.radio.amateur.digital.misc:8909

In the interest of home (and ham) safety, let me tell you about my
experience earlier tonight.

Funny what happens when you are talking about grounding.  During a
storm yesterday, one of the GFI circuits in the house was tripped.
Problem was that it wouldn't reset, so I went hunting for the cause.
I found a defective outlet, but along the way I also found some other
things that made me shudder - in the first receptacle along the
wiring path, I found an exposed neutral wire that broke when I
examined it.  Having repaired that, I was hoping I was done, but no
such luck, the next outlet on the string had 2 outbound wires from
the outlet box, and there was *no* safety ground wire connecting
to the duplex receptacle and the safety return wires were not
adequately connected together.  Correcting the open ground wire
condition finally lead me to the culprit receptacle on the rear
deck.

What is my point? Simply stated - trust nothing until you have
checked it out.  This is in a recently built house in a community
that *supposedly* has one of the toughest inspection teams in the
area for new structures.  You can be certain that I have a task
ahead of me, and I will not rest comfortably until I have checked
each and every connection point in the electrical system here.

I will also be communicating what I found to the town council and
the building inspection department.  This is the least I can do
for the protection of others as well as myself.

73,
Don W3FPR

From [e-mail] Thu 15 Jun 95 14:01:28
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hpscit.sc.hp.com!icon!hpbs3591.boi.hp.com!bblohm
From: [e-mail] (Bill Blohm)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Followup-To: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Date: 13 Jun 1995 17:23:44 GMT
Organization: Hewlett Packard Boise Printer Division
Lines: 30
Message-ID: <3rkhj0$[e-mail]>
References: <3r4qj0$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpbs1686.boi.hp.com
X-Newsreader: TIN [version 1.2 021193BETA PL3]
Xref: grape.epix.net rec.radio.amateur.antenna:11078 rec.radio.amateur.homebrew:7755 rec.radio.amateur.misc:80716 rec.radio.amateur.digital.misc:8920

Gary Coffman ([e-mail]) wrote:

: A ground window is simple in concept, and simple in execution.
: Basically, it is a physically small conductive plate through
: which *every* cable that enters or leaves your station must
: pass. Every cable that is supposed to be at "ground" potential
: is bonded directly to this plate as it passes through. Every
: conductor that is not supposed to be at "ground" potential
: is bonded to the plate via an appropriate suppressor device.
: (A book could be written on that subject alone.) Then the
: plate is connected to your single point ground by a heavy
: low inductance strap conductor. Now any large potential
: difference that tries to express itself across cables
: connected to various cabinets in your shack will find itself
: shorted out at the ground window.

Question:  Does every cable have to pass _through_ this, or
could this ground window be, for example, a strip of aluminum
along the back of the table (protected from accidental touching,
of course) to which all grounds for all pieces of equipment are
connected?  All the power connections, serial cables, etc. such
as you mention would have their ground connection applied to
this aluminum strip, and that would be connected to the house
grounding system, probably via an outlet box as there are no
pipes in that area to connect to.

Workable?

Bill B.
KC7JSD

From [e-mail] Thu 15 Jun 95 14:01:29
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Path: grape.epix.net!news.sprintlink.net!mv!usenet
From: [e-mail] (L. M. Rappaport)
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Message-ID: <[e-mail]>
Nntp-Posting-Host: lmr.mv.com
Sender: [e-mail] (System Administrator)
Organization: MV Communications, Inc.
Date: Wed, 14 Jun 1995 15:47:07 GMT
References: <3r4qj0$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
X-Newsreader: Forte Free Agent v0.71
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Xref: grape.epix.net rec.radio.amateur.antenna:11089 rec.radio.amateur.homebrew:7762 rec.radio.amateur.misc:80742 rec.radio.amateur.digital.misc:8931

[e-mail] (Gary Coffman) wrote:

...edited

>>     Ground Rod  --------+              +--------Stuff in shack
>>                                           |               |
>>     Ground Rod ---------+----------+--------Entrance Panel
>>                                           |               |
>>     Ground Rod ---------+              +--------Tower, etc

>Daisy chaining of any sort is generally to be avoided. However,
>this is not a daisy chain if I read the diagram correctly. What
>you have is a star connected group of grounds (I'm assuming you
>left out a couple of |'s in the drawing) that are connected to
>a single entrance point. That's a perfectly acceptable way to
>do it. IE

Yes, the idea is the entrance panel is connected to several ground
rods using individual cables and then not only regular house wiring
but also the tower and shack rf wiring goes to the same point.  Like a
big star.  (For some reason I can't draw that)

Where my scheme breaks down at the moment is that the tower has two
individual ground rods and there is one on each of three guy wires.
I'd guess that could cause a loop, eh?

Thanks,

Larry
--
Larry Rappaport W1HJF
[e-mail]
[e-mail]


From [e-mail] Thu 15 Jun 95 14:01:30
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!nothing.ucsd.edu!brian
From: [e-mail] (Brian Kantor)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Date: 14 Jun 1995 20:34:37 GMT
Organization: The Avant-Garde of the Now, Ltd.
Lines: 10
Message-ID: <3rnh4t$[e-mail]>
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Current practice (i.e., what I've seen recently) on mountaintop radio
sites around here seems to be to have replaced the feedthrough ground
plate with a simple grounding bar to which all of the incoming coaxes
are bonded before they enter the building.

I can see that this is simpler and much less prone to water entrance
problems, and it seems to me this might be adequate.

Is this the new practice or did someone just get real lazy?
        - Brian

From [e-mail] Thu 15 Jun 95 14:01:31
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!agate.berkeley.edu!tvr
From: [e-mail] (Tovar)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Date: 15 Jun 1995 05:02:08 GMT
Organization: University of California, Berkeley
Lines: 25
Message-ID: <[e-mail]>
References: <3r4qj0$[e-mail]> <3r8cvq$[e-mail]>
        <3r8tq4$[e-mail]> <3rb0kq$[e-mail]>
        <3rguc3$[e-mail]> <3rish1$[e-mail]>
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In-reply-to: DB Wilhelm's message of 13 Jun 1995 02:18:09 GMT
Xref: grape.epix.net rec.radio.amateur.antenna:11124 rec.radio.amateur.homebrew:7777 rec.radio.amateur.misc:80806 rec.radio.amateur.digital.misc:8942

    I found a defective outlet, but along the way I also found some other
    things that made me shudder - in the first receptacle along the
    wiring path, I found an exposed neutral wire that broke when I
    examined it.  Having repaired that, I was hoping I was done, but no
    such luck, the next outlet on the string had 2 outbound wires from
    the outlet box, and there was *no* safety ground wire connecting
    to the duplex receptacle and the safety return wires were not
    adequately connected together.  Correcting the open ground wire
    condition finally lead me to the culprit receptacle on the rear
    deck.

    What is my point? Simply stated - trust nothing until you have
    checked it out.  ...

Right!  Folks, (if you haven't done so already) get yourself what some
of us in the computer business refer to as a "Win-Lose" box.  You plug
it into an outlet, and two out of three lights will light up at the same
intensity if things seem to be wired right.  It's not perfect (my own
apartment fails in an odd way, which i recognized by slightly dim light,
which i know is hard to fix, being old enough to be pre-conduit), but
at least you will know what you're up against.  Likewise, if you're
moving into a new building, do yourself a service and go around checking
every outlet so you find out while it's still easy to fix.

        -- KD6PAG  (who is happy not to have learned the hard way...)

From [e-mail] Thu 15 Jun 95 14:01:32
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!emory!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <3r4qj0$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Date: Wed, 14 Jun 1995 14:43:31 GMT
Lines: 22
Xref: grape.epix.net rec.radio.amateur.antenna:11136 rec.radio.amateur.homebrew:7784 rec.radio.amateur.misc:80824 rec.radio.amateur.digital.misc:8949

In article <[e-mail]> [e-mail] (L. M. Rappaport) writes:
>
>Yes, the idea is the entrance panel is connected to several ground
>rods using individual cables and then not only regular house wiring
>but also the tower and shack rf wiring goes to the same point.  Like a
>big star.  (For some reason I can't draw that)
>
>Where my scheme breaks down at the moment is that the tower has two
>individual ground rods and there is one on each of three guy wires.
>I'd guess that could cause a loop, eh?

Connect them in a star at the tower base, and then connect that
point back to the star at the house. A star of stars is an acceptable
topology.

Gary

--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |

From [e-mail] Thu 15 Jun 95 14:01:33
Path: grape.epix.net!news.sprintlink.net!koala.scott.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Maxim MAX038 Source
Date: 13 Jun 1995 16:13:16 GMT
Organization: Scott Network Services, Inc.
Lines: 11
Message-ID: <3rkdes$[e-mail]>
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X-Newsreader: AIR News 3.X (SPRY, Inc.)

Does anyone have a source for the Maxim MAX038 HF Waveform Generator IC?  I have
checked with Digi-key and some of the other mainstream distributors and can't
find anyone with stock.  I need 10 or more, so sampling is out of the question.

Thanks,
Gene
WD4MPS  Birmingham, AL
[e-mail]
[e-mail]



From [e-mail] Thu 15 Jun 95 14:01:34
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Maxim MAX038 Source
Date: Wed, 14 Jun 95 06:57:35 PDT
Organization: Northwest Nexus Inc.
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Message-ID: <[e-mail]>
References: <3rkdes$[e-mail]>
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In article <3rkdes$[e-mail]>, <[e-mail]> writes:

> Does anyone have a source for the Maxim MAX038 HF Waveform Generator IC?  I
> have checked with Digi-key and some of the other mainstream distributors and
> can't find anyone with stock.  I need 10 or more, so sampling is out of the
> question.

For small quantities, you can buy them direct from Maxim with a visa or MC.

73 de KI7RH (Jay)



From [e-mail] Thu 15 Jun 95 14:01:35
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!pacbell.com!nntp-hub2.barrnet.net!news3.near.net!eisner!cloutier
From: [e-mail] (Steve Cloutier - Notes 'R Us)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Maxim MAX038 Source
Message-ID: <1995Jun14.125930.10243@eisner>
Date: 14 Jun 95 12:59:30 -0400
References: <3rkdes$[e-mail]>
Organization: DECUServe
Lines: 29

In article <3rkdes$[e-mail]>, [e-mail] writes:
> Does anyone have a source for the Maxim MAX038 HF Waveform Generator IC?  I have
> checked with Digi-key and some of the other mainstream distributors and can't
> find anyone with stock.  I need 10 or more, so sampling is out of the question.
>
> Thanks,
> Gene
> WD4MPS  Birmingham, AL
> [e-mail]
> [e-mail]
>
>
Try Future/Active Industrial.  They have an amazing stock, and their prices
are lower.  You will not be able to buy onzie-twozie quantities..  for
ICs, you'll probably have to get a minimum of 10, but you'll also find that
for some items they are 80% less (yes, a $4 item at digikey costs $1.70
at FAI - I bought such an item) in cost.

tel: [phone].

THere is probably a division near you.

DIsclaimer:  I don't work for FAI or have any association with them except
for being a satisfied customer.

Regards,
        Steve Cloutier, KA1SI  Mass



From [e-mail] Thu 15 Jun 95 14:01:35
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!Germany.EU.net!news.dfn.de!zam103!djukfa11!iff161
From: [e-mail] (Bob Mueller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Please count items!
Message-ID: <[e-mail]>
Date: 12 Jun 95 23:36:13 GMT
Organization: Forschungszentrum Juelich
Lines: 9

To anyone with the patience;
    I cannot believe I am receiving all the postings here. My board shows  none
since 9 June, 1995 and I suspect our system is sick (similar problems in other
groups!).  I would appreciate somebody's counting of the postings after the
nineth of June, or even better, a listing of the titles.  That will give me
something in the hand when I seek the trouble.  Please send one or the other of
the above to me at <iff161@djukfa11>.
     Thank you to anyone kind enough to help!
                          Sincerely, Bob

From [e-mail] Thu 15 Jun 95 14:01:36
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!network.ucsd.edu!news-mail-gateway
From: [e-mail] (Steven B Reed)
Newsgroups: rec.radio.amateur.homebrew
Subject: RCA Series 1000
Date: 13 Jun 95 19:26:57 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I have two okd RCA mobiles that I am trying to convert to 6-m.  One of
them works fine, the other reiceves but will not transmit.  Could anyone
tell me how to get my hands on a scematic or a service manual?
The following was coppied from a sticker on the top cover:
        RCA Series 1000
        TX = CT1-003A
        Model CMFM7MMHDR

Thanks in advance! de KB8STB  <[e-mail]


From [e-mail] Thu 15 Jun 95 14:01:40
Path: grape.epix.net!news.sprintlink.net!uunet!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Remote Transmatch Help Wanted
Date: 15 Jun 1995 04:54:39 GMT
Organization: TSE Systems
Lines: 94
Message-ID: <3roeef$[e-mail]>
References: <Pine.BSI.3.91.950605203103.1383D-100000-100000-100000-100000-100000-100000-100000-100000-100000-100000-100000-10000[e-mail]>
NNTP-Posting-Host: mkeitz.bevb.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #3


   Tony Stalls <[e-mail]> wrote:
>Does anyone have any experience with remoting an transmatch?  If you
>have, I would very much appreciate your sharing what kinds of motors,
>indicators, etc. you usd.
>
>I have seen a number of likely candidates for motors in the Herbach &
>Rademan and Fair Radio catalogues (other sources?), but I'm undecided
>about the number of rpm's to have to drive the varible capacitors, rotary
>inductors, and maybe switches.  (Remoting switches seems to be another can
>of worms all by themselves.) One person suggested using electric
>screwdrivers, but they seem less practical that reversable moters.
>
>Anyway, a hamfest a couple of weeks ago yielded several key components I
>had been looking for and I'm getting dangerously close to actually
>starting construction.  Any advice will be most appreciated.
>
>73,
>
>Tony
>K4KYO
>
>  <[e-mail]>

I haven't actually remoted a transmatch before, but based on my experience
with other projects I would suggest:

-Replace rotary switches with relays.  Either one SPST relay for each postion
on the switch, or a binary tree of SPDT relays if the switch has more than 3
or 4 postions and the extra power and control logic to close more than one
relay at once is not a problem.

-For tuning roller inductors, a screwdriver motor might actually be a good
choice since it has lots of torque and turns reasonably fast.  These are
easily reversible since they use a permanent magnet DC motor.  Their 2.4 Volt
high-current requirements are not optimum for driving through a long cable
though.

-Tuning of variable capacitors may be tougher since they only go 1/2 turn from
minimum to maximum.  A stepper motor might work here, but at the usual 1.8
degrees per step there would be only 100 steps from min to max.  Using a gear
reduction assembly like is sometimes used with a manual knob for precise
tuning could help make final adjustments easier in the higher bands.  Also, a
nonlinear varaible capacitor like is used in old (and new, for that matter) AM
radios would be useful for this, but I don't know if there are any built for
high voltage.

-Stepper motors can be driven to intermediate steps for fine tuning, but the
driver circuitry gets more complicated, although probably not prohibitively
more so.

-Of course variable inductors and capacitors could also be replaced with a
bunch of relays and fixed components.  The SGC automatic units supposedly work
that way.  Not much use if you have the Transmatch already and want an
inexpensive way to remote it though.

-For indicators, if stepper motors are used you just need to count the number
and direction of step pulses applied.  This technique needs to be synchronized
 by running the motor to one end of its range against a stop or limit switch
and setting the counter to zero every time the count is lost (which will most
likely be only if the power is turned off).

-Indicating the position of a shaft driven by a screwdriver motor is harder.
Also you probably want some sort of feedback (either manual or automatic) to
confirm that the shaft is actually turning.  Attaching an optical encoder disk
to the shaft would be one way.  Attaching the encoder to the motor shaft
(before the gearbox) would give really good resolution, but I don't think
there's an easy way to get access to it in most of the screwdriver
mechanisms.  I have had some success putting Hall effect sensors on the
outside of the gearbox to sense the passage of the gears inside.

-The obvious remote indicator is a potentiometer driven by the shaft.  More
mechanical work required to couple it on than there would be just counting
pulses applied to a stepper motor.  Also digital encoders would be nice if a
digital computing device is used at the control head.

-Really old remoted stuff like radar antennas used selsyns or (other "syns" or
synchros, I forget exactly what they were called) to indicate the position.
One is driven by the shaft and alters the phase of an AC signal supplied to
another one, which drives the pointer.  Really neat, having continuous
resolution over one turn.  Probably could be found surplus if you look, I
think they are too antiquated for most catalogs.  I'll bet the military still
uses them in a lot of stuff.

-Another method of indication would be to temporarily remotely disconnect the
capacitors and inductors from the circuit and remotely measure their
capacitance and inductance.  This could be done with an oscillator that uses
the component as part of its frequency determing network feeding a frequency
counter at the remote control head.  I would classify this technique as
"experimental" and maybe not too practical since you would need to turn the
transmitter off in order to take a measurement.

-Mike KD4QDM
***Wet Rims Require Increased Stopping Distance***

From [e-mail] Thu 15 Jun 95 14:01:41
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Remote Transmatch Help Wanted
Date: 15 Jun 1995 14:41:07 GMT
Organization: Netcom
Lines: 48
Distribution: world
Message-ID: <3rpgq3$[e-mail]>
References: <Pine.BSI.3.91.950605203103.1383D-100000-100000-100000-100000-100000-100000-100000-100000-100000-100000-100000-10000[e-mail]> <3roeef$[e-mail]>
NNTP-Posting-Host: ix-hou6-04.ix.netcom.com

In <3roeef$[e-mail]> [e-mail] (Mike Keitz) writes:

>
>
>   Tony Stalls <[e-mail]> wrote:
>>Does anyone have any experience with remoting an transmatch?  If you
>>have, I would very much appreciate your sharing what kinds of motors,
>>indicators, etc. you usd.
....lots of stuff deleted

I agree with Mike on most of the stuff.  I built one with the help of a
friend who understands digital servos and steppers and all that stuff a
remote tuner needs.  We used stepper moters from old 8" floppy drives,
used the optical encoders from Digital Equipment workstation mice, the
ones with two buttons instead of a ball.  This allowed us to have dials
to turn for the steppers.

The main disadvantage of the stepper is the number of wires required to
control it, luckily I had a spool of 30 pair phone wire.

We found electric rotary switches at a surplus place, they do exist,
these were 5 position 3 wafer switches fairly heavy.

Indicators was where we fell down, tried various methods and wimped out
and used a rather unusual method that would be very expensive if we
didn't already have a large junk box.

We mounted lights on the tuner to indicate the switch positions, and a
little halogen light to illuminate the whole thing, then mounted a black
and white closed circuit TV camera above it, with a monitor in the
Shack.  I use it to tune a pair of delta loops made from the guy wire
of a vertical, fed with ladder line.

It works, was it worth the effort or expense absolutely not, but it was
a fun project and I learned a lot.  I have the contraption in the attic
and the ladder line through the roof, and have nightmares everytime it
storms.  I will probably go back to the old method of ladderline
throught the glass in a window and a manual tuner and alligator clips to
connect it to the ground bus in the shack when it storms.

QST had plans that we based our design on in 89  or 90 I think, it was
called either a Balanced balanced tuner, or a double balanced tuner.  It
uses 2 roller inductors, and two capacitors in either parallel, or
series configurations.  We of course had to tweek it to add other
combinations that don't do much.

Good luck
KI5GY

From [e-mail] Thu 15 Jun 95 14:01:42
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!pipex!demon!g0ruz.demon.co.uk!conrad
From: Conrad Farlow <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Source of Kapton or Ultem needed
Date: 13 Jun 1995 23:22:59 +0100
Organization: None
Lines: 11
Sender: [e-mail]
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dispatch.demon.co.uk
X-Newsreader: Newswin Alpha 0.7
X-Posting-Host: g0ruz.demon.co.uk

Hello,I am just about to recommision my 2m PA.It is the 4cx1000a from
the ARRL handbook.I have had problems with the occaisional flashover
when the PA was in standby.I tracked it down to a tiny perforation in
the PTFE sandwich on the anode line.I know that either of these two
materials will cure the problem,I think the ptfe is a little bit too
thin or I'm not careful enough one or the other.Anyway if anyone has
enough for this PA I would be glad to buy it.
73 de Conrad G0RUZ
email [e-mail]
Packet Radio G0RUZ @ GB7WRG.#19.GBR.EU
"A sucessful eme'r is the one who wastes the least electricity"

From [e-mail] Thu 15 Jun 95 14:01:43
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!network.ucsd.edu!news-mail-gateway
From: [e-mail] (Clark Fishman, FSAC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Synthesiser Controller
Date: 13 Jun 95 12:20:54 GMT
Organization: ucsd usenet gateway
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Has anybody out there got a microcontroler for the Mototola
frequency systhesiser chips that use a serial interface???
I am experimenting with the Basic Stamp and would like to use
a PIC chip......Let's exchange ideas...I would like to use
these systhesiers in some QRP tranceiver designs I have...

I am good with RF and not so hot with digital design...

Let me know what's happening

Clark Fishman  WA2UNN      [e-mail]

From [e-mail] Thu 15 Jun 95 14:01:44
Path: grape.epix.net!news.sprintlink.net!hookup!reptiles.org!westonia!humnet.westonia.com!hduff
Subject: Synthesiser Controller
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Tue, 13 Jun 95 21:28:20 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 37


>
> Has anybody out there got a microcontroler for the Mototola
> frequency systhesiser chips that use a serial interface???
> I am experimenting with the Basic Stamp and would like to use
> a PIC chip......Let's exchange ideas...I would like to use
> these systhesiers in some QRP tranceiver designs I have...
>
> I am good with RF and not so hot with digital design...
>
> Let me know what's happening
>
> Clark Fishman  WA2UNN      [e-mail]


Hi Clark... I have sucessfully used an Intel 8031 micro to control
a Motorola MC145190 serially programmed PLL chip.
Also used and 8031 to control the Kenwood TM-741/742 series of VHF/UHF
modules independant of the radio (same idea...serial programmed).
You basically need 3 parallel I/O lines...CLOCK,DATA and ENABLE.
Toggle the ENABLE line then clock the data in, i bit at a time.
The basic concept is not difficult but the trickier programming comes
into play when you want the thing to be frequency agile as well as
control a display and deal with input from a keypad or rotary encoder.
Let me know if you have any specific questions...
regards...Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]

--
---------------------------------------------------------------------
  HumberNet LSS (Learning Support System) - Humber College, Toronto
     "Tomorrow's communication and learning environment, today"
          Visit our Website at http://humnet.humberc.on.ca/


From [e-mail] Thu 15 Jun 95 14:01:45
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JSchmoe21)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Synthesizer Controller
Date: 13 Jun 1995 17:05:38 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <3rkuj2$[e-mail]>
References: <3rk7t8$[e-mail]>
Reply-To: [e-mail] (JSchmoe21)
NNTP-Posting-Host: newsbf02.mail.aol.com

What motorola data book did you find this stuff in? I have the motorola RF
device databook, and I can't find any of those frequency synthesizer
chips, one chip receivers, etc... Am I looking in the wrong book?

Reply to [e-mail] -- Thanks in advance.

From [e-mail] Thu 15 Jun 95 14:01:45
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!iii1.iii.net!not-for-mail
From: [e-mail] (Thomas C Sefranek)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Synthesizer Controller
Date: 14 Jun 1995 12:54:13 -0400
Organization: iii.net
Lines: 18
Message-ID: <3rn488$[e-mail]>
References: <3rk7t8$[e-mail]> <3rkuj2$[e-mail]>
NNTP-Posting-Host: iii1.iii.net

In article <3rkuj2$[e-mail]> [e-mail] (JSchmoe21) writes:
>What motorola data book did you find this stuff in? I have the motorola RF
>device databook, and I can't find any of those frequency synthesizer
>chips, one chip receivers, etc... Am I looking in the wrong book?
>

Try Motorola Communications Device Data book.
Also the Micro-controller Data books.

I prefer the 68HC11 when programming the PLL chips.

>Reply to
[e-mail] -- Thanks in advance.

Tom

--
Thomas C. J. Sefranek  WA1RHP

From [e-mail] Thu 15 Jun 95 14:01:47
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!decwrl!purdue!news.bu.edu!transfer.stratus.com!usenet
From: "J.Swenson" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Where can I find this transformer ?
Date: 14 Jun 1995 01:53:20 GMT
Organization: Stratus Computer Inc, Marlboro MA
Lines: 30
Message-ID: <3rlfeg$[e-mail]>
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I am looking for a power transformer or its equivalent from a CV-157
which is an SSB/AFC unit for the R390A receiver. Originally made by The
Industrial Transformer Corporation of Gouldsboro PA.
Part # DP-7152 ,   Spec # TF1RX03YY,   Drawing # SM-D-180211.
Specs. as follows:Max temp rise 35'c, wkg volt.@700 max, primary 48-62cps
Primary taps at 105,110,115,120,125,210,220,230,240  (will need 115vac)
Sec. 5v@4a with 375 wkg v., 1000v CT (2@500v/250ma), 6.3v@2.5a,
6.3v@1.25a, 400v CT (2@200v/30ma)with 500 wkg.v.and 6.3v@16.5a
(see diagram below if it comes out)


pin#      1    2     3     4     5     6       7     8     9    10    11
          !    !     !     !     !     !       !     !     !     !     !
primary   C  105v  110v  115v  120v  125v    210v  220v  230v  240v  250v
  vac
       UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
-------------------------------------------------------------------------
_________________________________________________________________________
^^^^^^    ^^^^^^^^^^^^^^^   ^^^^^^   ^^^^^^^    ^^^^^^^^^^^^^^^    ^^^^^^
!5v-4a !   ! 500v ! 500v !   !6.3v!   !6.3v !    ! 200v ! 200v ! ! 6.3v !
! 375  !   ! rms  !  rms !   !2.5a!   !1.25a!    ! rms  ! rms  ! !   !  !
!wkg v.!   !    250ma    !   !    !   !     !    !     30ma    ! ! 16.5a!
!      !   !      !      !   !    !   !     !    ! wkg. v. 500 ! !   !  !
!      !   !      !      !   !    !   !     !    !      !      ! !   !  !
12    13   14    15     16   17  18   19   20    21     22    23 24 25 26

The working voltage seems to be the maximum dc across these windings.
Thanks in advance for any help you may give me in locating this unit.



From [e-mail] Mon 19 Jun 95 16:52:30
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!usenet.eel.ufl.edu!newsmaster
From: [e-mail] (Shima)
Newsgroups: rec.radio.amateur.homebrew
Subject: ** News on Latest Real-Time DTMF Decoder **
Date: 17 Jun 1995 04:40:25 GMT
Organization: Your Organization
Lines: 19
Message-ID: <3rtmbp$[e-mail]>
NNTP-Posting-Host: pppslip4.eel.ufl.edu
X-Newsreader: WinVN 0.93.14

Also included is my latest real-time DTMF decoder demo DTMF_RT2.ZIP. It
uses a PC and a sound card to decode incoming DTMF tones in real time.

Any SB compatible sound card will work.  Previously, DTMF_386.EXE was
incorrectly compiled, and some users couldn't run it.  Hopefully more
persons will try it and find it suitable..

I also have custom versions of DTMF_486 for persons with custom needs,
such as home-made answering machines, serial port transmission of
detected tones, etc..  Please email me for any information.


Thanks.

J.M. Shima
[e-mail]




From [e-mail] Mon 19 Jun 95 16:52:31
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!nwfocus.wa.com!krel.iea.com!comtch!bmork
From: [e-mail] (Brian Mork)
Newsgroups: sci.electronics.repair,rec.radio.amateur.homebrew,rec.radio.swap
Subject: 4$ale Tek 1.8 GHz SpectrAnalyz
Date: 18 Jun 1995 00:01:19 GMT
Organization: CompuTech, Spokane WA
Lines: 39
Message-ID: <3rvqcf$[e-mail]>
NNTP-Posting-Host: comtch.iea.com
X-Newsreader: TIN [version 1.2 PL1]
Xref: grape.epix.net sci.electronics.repair:9255 rec.radio.amateur.homebrew:7830 rec.radio.swap:37541

A rare golden bird - super condition!

Tektronix spectrum analyzer, composed of the following components:

 - 7613 frame, selectable *storage scope* or normal trace
 - 7A17 fixed gain amplifier plug-in
 - 7L12 1.8 GHz spectrum analyzer dual-wide plug-in

 - a spare 7603 frame, but display tube is non-functional

It's all solid state, in a standard Tek mainframe from circa 1980's.
The left of three slide-ins is taken by a no-frills, fixed gain vertical
amp.  This is available as the left channel on the mainframe.  The center
and right slot are the spectrum analyzer, and show as the right channel
on the display.

On screen dynamic range:  top of the screen grid is marked REF and
the bottom division is marked -80 dB.

Sensitivity:  picks up all the local TV and radio stations using a
paperclip on the input connector.  The sensitivity dial spins around
to a minimum reference level of -100 dBm.

Tracking generator?  No.  It does, however, have 1st and 2nd LO outputs.
You'd need to externally mix it to generate a local version of the input
frequency.

Tucker sells just the 7L12 plug-in for $3995, but street prices seem to
check out at 1/2 to 1/3 of Tucker's --about $1300 for the 7L12 alone in
recent issues of Nuts & Volts. I offer the entire package for $1790,
including the second mainframe for spare repair parts.

Call me at 509-244-3764 (West Coast time) or email:
  ARO ka9snf@ka7fvv.#ewa.wa.us.na, or Internet [e-mail]  /Brian

--
Brian J. Mork, InCrea (TM) - Pacific Northwest, Voice 509-244-3764
 [e-mail] / ARO ka9snf@ka7fvv.#ewa.wa.usa
  USMail 6006-B Eaker, Fairchild, WA 99011

From [e-mail] Mon 19 Jun 95 16:52:33
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!noc.near.net!news3.near.net!eisner!cloutier
From: [e-mail] (Steve Cloutier - Notes 'R Us)
Newsgroups: rec.radio.amateur.homebrew
Subject: 6C33C Tube Transmitter (Was: High Efficiency MOSFET HF Transmitter
Message-ID: <1995Jun19.133533.10307@eisner>
Date: 19 Jun 95 13:35:33 -0400
References: <1995Jun14.125209.10242@eisner> <3ro0vn$[e-mail]> <[e-mail]>
Organization: DECUServe
Lines: 45


In article <[e-mail]>, [e-mail] (Eric Barbour) writes:
> I have messed around with 6C33s. Your proposal is
> gonna exceed the plate dissipation of 100w per tube.
> I would say, don't try to put more than 10 watts into the grid.
> If you want a kW, try using 8 of them, each running 250mA
> at 300v. Don't push them, they have grid-current problems
> when you approach max dissipation, causing bias instability.
>
> Eric Barbour
> GLASS AUDIO

Thanks for answering... If you're involved with some of the designs in
Glass AUdio, you probably have lots more experience with these puppies
than I do :-)

I don't understand why I would be exceeding the dissipation of the
tube, but maybe I'm missing something (probably)!

The rating sheet I got (a poor one at that) shows the tube good for
60 watts (both units together) and a max plate current of 600MA.  Nothing
for plate input or grid dissipation or current.  Other tubes are
conservatively rated at more than 3 times their plate dissipation for
input, so I used that figure for now.

My proposal was to run 300 volts at 500 or 600 MA for an input power of
150 to 180 watts.  Class D (switching mode - square wave drive).  The
plate efficiency should be better than 90% (I'v run tubes like this
before and get over 90% efficiency), so the plate dissipation should be
less than 20 watts per tube.

For a KW, I'd use 6 or 7 (maybe 8) tubes.

Hopefully, I'll get away without neutralization (with the low impedance
non-resonant driver and the fact that this is switching mode).... but
that remains to be seen.

What is the best source for these tubes?  They seem rather expensive.
I'd like to pay less than $20 each.


Regards,
        Steve cloutier KA1SI

>

From [e-mail] Mon 19 Jun 95 16:52:33
Path: grape.epix.net!news.sprintlink.net!simtel!nexus.coast.net!news1.oakland.edu!detroit.freenet.org!detroit.freenet.org!ad161
From: [e-mail] (Tim Machovec)
Newsgroups: rec.radio.amateur.homebrew
Subject: @@Radio Shack@@
Date: 18 Jun 1995 19:13:32 GMT
Organization: Greater Detroit Free-Net, Detroit, MI
Lines: 11
Message-ID: <3s1tss$[e-mail]>
Reply-To: [e-mail] (Tim Machovec)
NNTP-Posting-Host: detroit.freenet.org


DOes radio shack sell good fm transmitters like 5-watt ones or do they
even sell low-power tranmitters or kits? Anyreplys would be VERY accepted..

Please reply to [e-mail]

--
VDDRDD? DDRDD VDDRDD?  "Ask not what I can do for you, but
   :      :   :  :  :       what you can do for me!"
   :      :   :  :  :
   :    DDRDD :  :  :

From [e-mail] Mon 19 Jun 95 16:52:34
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!sislnews.csc.ti.com!usenet
From: [e-mail] (Mitchell Carson)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Advice wanted: Calculating SWR from fwd vs. reflected pwr readings
Date: 18 Jun 1995 18:49:36 GMT
Organization: Texas Instruments
Lines: 25
Message-ID: <3s1sg0$[e-mail]>
Reply-To: [e-mail] (Mitchell Carson)
NNTP-Posting-Host: mcarson.sc.ti.com
X-Newsreader: IBM NewsReader/2 v1.09
Xref: grape.epix.net rec.radio.amateur.antenna:11265 rec.radio.amateur.homebrew:7845

Someone please give this poor boy (me) some advice.

I'm currently working on a homebrew J-pole antenna for 2m and 70cm use.
Unfortunately, I do not own a SWR meter for the 70cm bands (none of my
local amateur friends do either).  However, one of my friends has a
forward/reflected power meter with a 2m & 70cm slug in it.

I realize that I have to position the coax feedpoints to the J-pole radials in
order to tune the SWR's to an acceptable level.  I have access to a MFJ-249
antenna analyzer but it will only work from 1.8 to 170 MHz.  I plan on using
this instrument to tune the 2m portion of the J-pole.

I'm presuming that SWR's can be calculated from forward vs. reflected power
measurements.  The problem is that I can't locate any references to this
subject in any of the local libraries.  If it is possible to derive SWR's from
this type of measurement, would someone be kind enough to provide me with
a suitable formula?

Thanks in advance and 73,
Mitchell
KC5MKW

[e-mail]

Std. disclaimer:  I speak only for myself.

From [e-mail] Mon 19 Jun 95 16:52:35
Path: grape.epix.net!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Advice wanted: Calculating SWR from fwd vs. reflected pwr readings
Date: 19 Jun 1995 00:05:08 GMT
Organization: News & Observer Public Access
Lines: 29
Message-ID: <3s2evk$[e-mail]>
References: <3s1sg0$[e-mail]>
NNTP-Posting-Host: grail1503.nando.net
Xref: grape.epix.net rec.radio.amateur.antenna:11277 rec.radio.amateur.homebrew:7848

[e-mail] (Mitchell Carson) wrote:
>
> Someone please give this poor boy (me) some advice.
> I'm presuming that SWR's can be calculated from forward vs. reflected power
> measurements.  The problem is that I can't locate any references to this
> subject in any of the local libraries.  If it is possible to derive SWR's from
> this type of measurement, would someone be kind enough to provide me with
> a suitable formula?
>
Certainly SWR can be calculated from forward power and reflected
power.  Check the Transmission Line section of an ARRL Handbook
for the formulas,  Or in case you don't have access to a handbook,

  SWR = (1 + rho)/(1 - rho)
    my *rho* is usually written as the lower case greek letter rho.
and
  rho = the square root of (Pr/Pf)
         where Pf = power in the forward wave
               Pr = power in the reflected wave

Now that all that is done, there is usually an easier way to tune
antennas, Just tune for minimum reflected power.  If you get to
zero reflected, the SWR is 1.
I have been doing this for years with good success since it is usually
not impoortant to me just what the SWR is, but I want it at a minimum.

73,
Don W3FPR


From [e-mail] Mon 19 Jun 95 16:52:36
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Michael Ferraro)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE:building a CW receiver question...
Date: 17 Jun 1995 14:10:42 GMT
Organization: Netcom
Lines: 15
Distribution: world
Message-ID: <3runp2$[e-mail]>
NNTP-Posting-Host: ix-sb1-06.ix.netcom.com

 Steve: I would suggest you purchase the 1995 Radio Amateurs Handbook
or any previous edition of same. Besides haveing some simple receiver
projects, the Handbook contains much technical and amateur radio
information.

Also, take a trip down to your local library and see if they receive
"QST" magazine which is put out by the Amateur Radio Relay League and
contains many receiver projects.



73's,

Mike K6ZSR


From [e-mail] Mon 19 Jun 95 16:52:37
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!ux1.cso.uiuc.edu!ss6349
From: [e-mail] (Steven H. Schimmrich)
Newsgroups: rec.radio.amateur.homebrew
Subject: Building a CW receiver question...
Date: 17 Jun 1995 13:37:38 GMT
Organization: Department of Geology, University of Illinois at Urbana-Champaign
Lines: 19
Distribution: world
Message-ID: <3rulr2$[e-mail]>
NNTP-Posting-Host: ux1.cso.uiuc.edu


  Please excuse me if this is a stupid question but I'm new to this and I
haven't been able to locate a FAQ for this group.  I don't have a license,
I'd like to learn code, and I've heard that the ARRL transmits code practice
(I don't know the frequency).  Does anyone know of any references to schematic
diagrams that I can use to build a receiver to pick this up?  Yes, I'm sure I
could go out and buy a receiver but I really would like to build one (I enjoy
building things, maybe some of you can understand that :).  I do have some
electronics experience so it only has to be a schematic but I'd like something
quick & easy.  Thanks.
                                                                    - Steve.

--
      Steven H. Schimmrich           [e-mail]

      Department of Geology, University of Illinois at Urbana-Champaign
         245 Natural History Building, Urbana, IL 61801  [phone]

                 http://hercules.geology.uiuc.edu/~schimmri/

From [e-mail] Mon 19 Jun 95 16:52:38
Path: grape.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!pagesat.net!a3bsrv.nai.net!usenet
From: [e-mail] (David Newkirk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a CW receiver question...
Date: Sun, 18 Jun 1995 11:21:16 GMT
Organization: North American Internet Company
Lines: 25
Message-ID: <3s12rg$[e-mail]>
References: <3rulr2$[e-mail]>
NNTP-Posting-Host: dnewkirk.nai.net
X-Newsreader: Forte Free Agent v0.55

[e-mail] (Steven H. Schimmrich) wrote:

[deletion]

>I don't have a license,
>I'd like to learn code, and I've heard that the ARRL transmits code practice
>(I don't know the frequency).  Does anyone know of any references to schematic
>diagrams that I can use to build a receiver to pick this up?

W1AW's transmits code practice at 1.818, 3.5815, 7.0475, 14.0475,
18.0975, 21.0675, 28.0675 and 147.555 MHz.

Yes; ARRL published the circuit of a little (two-IC) receiver intended
precisely for that purpose. See Lee Richey, WA3FIY, "W1AW at the Flick
of a Switch," *QST*, Feb 1993, p 56 and 57. Call the ARRL Technical
Department Secretary (203-666-1541) for info on how to get a
photocopy; I think it'll cost you $3.

Regards,

David Newkirk (WJ1Z)
email: [e-mail]




From [e-mail] Mon 19 Jun 95 16:52:39
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cross Field Antenna Designs - Any Good?
Date: 17 Jun 1995 12:40:49 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 40
Message-ID: <3ruigh$[e-mail]>
References: <3rgq38$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>    It does, doesn't it. Believe me, the people who originated it take
>it very seriously indeed and spent a lot of time and money on patenting
>it. Whether it works effectively is a separate question.

True. Remember you can patent *almost everything* if you reckon
someone is going to bye it. Exceptions are plain perpetuum mobiles.

>    The idea of simultaneously generating E and H fields is perfectly
>valid.

No antenna will radiate unless it generates (alternating) E and H
fields simultaneously.

>An antenna
>that really did create both would simply have no "near field" region
>with unbalanced E and H components.

This is where they are wrong. *Any* very small antenna, loop or whip
will suffer from it's low radiation resistance. The same applies to
the coiled mobile 5/8 antennas for CB.

>There is nothing that makes this *implicitly*
>inefficient, or troublesome.

Yes there is for all very small antennas: The need to transform
the feed point impedance to 50 Ohms is a potential source of losses,
and with the low radiation resistance of a few Ohms it would need
a perfect conducting ground plane to work efficiently.

>   While this openness means that readers have to be selective, it
>provides a channel for occasional odd ideas and unusual approaches that
>can stimulate new ideas

Spreding new ideas is a good thing, but providing free advertisement
for those who try to get other's money by selling them junk, is mildly
said *naive*.

73, Moritz DL5UH (ex GM4ZNQ)



From [e-mail] Mon 19 Jun 95 16:52:40
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cross Field Antenna Designs - Any Good?
Date: 18 Jun 1995 07:21:54 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 46
Sender: [e-mail]
Message-ID: <3s128i$[e-mail]>
References: <3ruigh$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

Mortz wrote:

>True. Remember you can patent *almost everything* if you reckon
>someone is going to bye it. Exceptions are plain perpetuum mobiles.

>No antenna will radiate unless it generates (alternating) E and H
>fields simultaneously.

>>An antenna
>>that really did create both would simply have no "near field" region
>>with unbalanced E and H components.

>This is where they are wrong. *Any* very small antenna, loop or whip
>will suffer from it's low radiation resistance. The same applies to
>the coiled mobile 5/8 antennas for CB.

And let me add that modifying the radiator so the E and H fields are equal
will not eliminate near field effects. Near field is the area  where the
antenna does not look like a point of radiation, instead it looks like the
field comes from many points in space. If the cross field antenna *works*
on the principle that equal E/H fields alone eliminate near fields effects
they are full of ....stuff.

>>There is nothing that makes this *implicitly*
>>inefficient, or troublesome.

>Yes there is for all very small antennas: The need to transform
>the feed point impedance to 50 Ohms is a potential source of losses,
>and with the low radiation resistance of a few Ohms it would need
>a perfect conducting ground plane to work efficiently.

>Spreding new ideas is a good thing, but providing free advertisement
>for those who try to get other's money by selling them junk, is mildly
>said *naive*.

>73, Moritz DL5UH (ex GM4ZNQ)

Mortz certainly appears correct in all his opinions and facts.

But someone please answer my question. What is this alleged "cross field
antenna" and what is the theory? It sounds suspiciously like these "E
field displacement radiators" or "Magnetic radiators" that allegidly
eliminate losses.

73 Tom


From [e-mail] Mon 19 Jun 95 16:52:41
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Cross Field Antenna Designs - Any Good?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <3ruigh$[e-mail]> <3s128i$[e-mail]>
Date: Sun, 18 Jun 1995 16:46:30 GMT
Lines: 18

In article <3s128i$[e-mail]> [e-mail] (W8JI  Tom) writes:
>But someone please answer my question. What is this alleged "cross field
>antenna" and what is the theory? It sounds suspiciously like these "E
>field displacement radiators" or "Magnetic radiators" that allegidly
>eliminate losses.

That's because it is a pair of those things, crossed to form an E
and a H field at right angles to each other. Since those things don't
really work, it's not surprising that combining them doesn't work
either. (Well, they work, just not very efficiently.)

Gary

--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |

From [e-mail] Mon 19 Jun 95 16:52:41
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cross Field Antenna Designs - Any Good?
Date: 18 Jun 1995 23:48:00 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
Message-ID: <3s2s1g$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com


>That's because it is a pair of those things, crossed to form an E
and a H field at right angles to each other. Since those things don't
really work, it's not surprising that combining them doesn't work
either. (Well, they work, just not very efficiently.)

Gary<

Gary,

I get it now (I think). Someone that doesn't understand EM theory took two
folklore antennas, a low loss *magnetic* radiator and a low loss *E field*
radiator and combined the two inefficient designs to produce a even less
efficient device?

Sounds like a innovative design. Nothing for something. ;-)

73 Tom

From [e-mail] Mon 19 Jun 95 16:52:43
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Cross Field Antenna Designs - Any Good?
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Mon, 19 Jun 1995 15:38:56 GMT
References: <3ruigh$[e-mail]>
Nntp-Posting-Host: hpqmocc.sqf.hp.com
Organization: Hewlett-Packard LTD, South Queensferry, Scotland
X-Newsreader: TIN [version 1.1 PL8.8]
Lines: 66

[e-mail] wrote:


: No antenna will radiate unless it generates (alternating) E and H
: fields simultaneously.

   Re-reading what I wrote, I think my phrasing was poor.  I was trying
to say that a "mature" electromagnetic wave propagating in free space
many wavelengths from its source and any other body consists of an
orthoganal pair of alternating E and H fields,  in phase, and with
amplitudes in the ratio 377 volts/ metre of E field for each ampere per
metre of H field.  Close to an antenna, the fields are not necessarily
in their final amplitude relationship. It's rather interesting to use
small field probes to explore the close fields of, say, an operating
dipole.

: >An antenna
: >that really did create both would simply have no "near field" region
: >with unbalanced E and H components.

: This is where they are wrong. *Any* very small antenna, loop or whip
: will suffer from it's low radiation resistance. The same applies to
: the coiled mobile 5/8 antennas for CB.

   Yes, this is what I doubted about the implementation of their
transducers, they look very difficult to drive efficiently.

: >There is nothing that makes this *implicitly*
: >inefficient, or troublesome.

: Yes there is for all very small antennas: The need to transform
: the feed point impedance to 50 Ohms is a potential source of losses,
: and with the low radiation resistance of a few Ohms it would need
: a perfect conducting ground plane to work efficiently.

   It's really the combination of the performance of available materials
and the demands placed by small structures. I wonder if higher
temperature superonductors are possible?

: >   While this openness means that readers have to be selective, it
: >provides a channel for occasional odd ideas and unusual approaches that
: >can stimulate new ideas

: Spreding new ideas is a good thing, but providing free advertisement
: for those who try to get other's money by selling them junk, is mildly
: said *naive*.

   I'm not sure how much of that Sprat article was someone having fun,
but a bit of wire and some tin cans is not easily interpreted as making
money by selling junk, and I rather suspect that no-one was impelled to
buy one of the much more expensive commercial versions.



: 73, Moritz DL5UH (ex GM4ZNQ)


                       ^^^^^^


   The propensity for a certain callsign to get confused begins to feel
like an albatross round my neck  :-)   George printed G4ZNQ in the power
meter article, and so 'ZNQ spread around the world.

   Cheers,
           David  GM4ZNX

From [e-mail] Mon 19 Jun 95 16:52:44
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.cais.com!wdnuucp!john.dolan
From: [e-mail] (JOHN DOLAN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Design Advice
Message-ID: <[e-mail]>
Date: Fri, 16 Jun 95 15:37:00 -300
Distribution: world
Organization: World Data Network BBS.  Since 1984.  Telnet wdn.com.
Reply-To: [e-mail] (JOHN DOLAN)
X-Newsreader: PCBoard Version 15.21
X-Mailer: PCBoard/UUOUT Version 1.10
Lines: 17

The Heathkit HF Transceiver SB102 with the SB650 (digital frequency
display) operated (as I understand it) by varying a LMO from 5.0 to
5.5 and mixing that with a hetrodyne oscillator with various xtals
for various bands. The SB650 display (as I understand it) read those
two frequencies and one other frequency (a carrier oscillator, I
think) and then calculated the transmitting or receiving frequency.

I have a SB102 and would like to build a digital frequency display,
for transmitting and receiving.  I am soliciting advice on the
approach.  Any suggestions or comments welcome. I have not ruled out
a simple outboard frequency meter (but never having experimented in
this area, I don't know the pros and cons of just sampling the input
freq to the driver on transmit and the and the...hmmm not sure here
what to sample in the receive mode.  Thanks in advance.  K3FIG...

---
 * RM 1.3 01435 * Experience is what you get after you need it!

From [e-mail] Mon 19 Jun 95 16:52:45
Path: grape.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!iii1.iii.net!not-for-mail
From: [e-mail] (Thomas C Sefranek)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Design Advice
Date: 18 Jun 1995 22:26:32 -0400
Organization: iii.net
Lines: 11
Message-ID: <3s2n9b$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: iii1.iii.net

Typical displays mix (add) the lowest IF (455Khz) with the selected L.O
(Band osc.) and mix (add) the LMO (5.5Mhz).  This works for receive also.

In some cases you must subtract the LMO, but it's a matter of selecting
which product from the mixer. (Sum or Dif.)

73
Tom

--
Thomas C. J. Sefranek  WA1RHP

From [e-mail] Mon 19 Jun 95 16:52:45
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!caen!kuhub.cc.ukans.edu!kuhub.cc.ukans.edu!nntp
Newsgroups: rec.radio.amateur.homebrew
Subject: eprom programmer info reqst.
Message-ID: <[e-mail]>
From: [e-mail] (Artus)
Date: 18 Jun 95 16:10:08 CDT
Organization: Personal
Nntp-Posting-Host: kuts3p02.cc.ukans.edu
X-Newsreader: WinVN 0.99.3
MIME-Version: 1.0
Lines: 6

Need info on Logical Devices, Inc.
Shooter EE/EPROM programmer. Prompro series.
Particularly software, pinout for serial connector, and dip switch
settings.  Copy of Manual would be ideal.  All assistance appreciated.
        Jack


From [e-mail] Mon 19 Jun 95 16:52:46
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM demodutator - any good chips?
Date: 17 Jun 1995 12:48:14 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 10
Message-ID: <3ruiue$[e-mail]>
References: <[e-mail]> <3rtf56$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

There have been the designs with the CA3089 in NBFM applications,
some of which worked, some not so well. Their main problem
is the low output and hence the poor signal to noise.
You can improve it somehow by playing with (increasing) the
feed choke to the discriminator, but do not expect miracles.

There are good reasons why newer designs use a 2nd IF at 455KHz.

73, Moritz DL5UH


From [e-mail] Mon 19 Jun 95 16:52:47
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!library.ucla.edu!info.ucla.edu!csulb.edu!csus.edu!netcom.com!ebarbour
From: [e-mail] (Eric Barbour)
Subject: Re: High Efficiency MOSFET HF Transmitter
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)

X-Newsreader: TIN [version 1.2 PL1]
References: <1995Jun14.125209.10242@eisner> <3ro0vn$[e-mail]>
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Lines: 10
Sender: [e-mail]

I have messed around with 6C33s. Your proposal is
gonna exceed the plate dissipation of 100w per tube.
I would say, don't try to put more than 10 watts into the grid.
If you want a kW, try using 8 of them, each running 250mA
at 300v. Don't push them, they have grid-current problems
when you approach max dissipation, causing bias instability.

Eric Barbour
GLASS AUDIO


From [e-mail] Mon 19 Jun 95 16:52:48
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!haven.umd.edu!purdue!news.cs.indiana.edu!lynx.unm.edu!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: High Efficiency MOSFET HF Transmitter
Date: 17 Jun 1995 03:49:16 GMT
Organization: JP Accelerator Works, Inc.
Lines: 23
Message-ID: <3rtjbs$[e-mail]>
References: <1995Jun14.125209.10242@eisner>
NNTP-Posting-Host: dial131.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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I have used power MOSFETS (4 IRF840 in parallel) to drive the cathode of
a 3CPX1500A7 to achieve 40 kW pulsed rf at 2 MHz up to 1% duty factor and
up to 100 usec pulse width.  You might want to contact your International
Rectifier rep to get info on their new low charge series, with about half
the capacitance/gate charge of comparable devices.  I have experience
with some sample IRFPC60LC (600V 0.4 ohm on resistance) devices.  I'm not
sure when these are going to be in production, but sample quantities are
available.   You might also contact George Krausse at Directed Energy in
Fort Collins CO.  His company puts power MOSFET dies in VHF (i.e. very
low inductance) packages and uses them as high voltage rf switches with
phenomenally short risetimes.  They also have advertised rf applications
at high frequencies.  I seem to remember 1 kW, 30 MHz, but can't swear to
it.

--
===================================================================

James M. Potter, President      Internet: [e-mail]
JP Accelerator Works, Inc.      AOL: [e-mail]
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]



From [e-mail] Mon 19 Jun 95 16:52:49
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!noc.near.net!news3.near.net!eisner!cloutier
From: [e-mail] (Steve Cloutier - Notes 'R Us)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: High Efficiency MOSFET HF Transmitter
Message-ID: <1995Jun19.130352.10305@eisner>
Date: 19 Jun 95 13:03:52 -0400
References: <1995Jun14.125209.10242@eisner> <3ro0vn$[e-mail]>
Organization: DECUServe
Lines: 18

In article <3ro0vn$[e-mail]>, [e-mail] (Thomas C Sefranek) writes:
> Hey Steve!
>         I was just talking to a guy near you, in Pepperell... on A.M.
> Sound a lot like you...  Maybe you could consult...
> :) :) :)
>
> I have made a few MOSFET transmitters and amplifiers, keep me posted,
> better still Ham nite is Mondays at my place!
>
Sounds like fun!  I wonder who the guy in Pepperell was... I'm in
Townsend (the next town for those who ton't know).  Usually, all of the
regular AM operators know each other.


> Tom
>
> --
> Thomas C. J. Sefranek  WA1RHP

From [e-mail] Mon 19 Jun 95 16:52:50
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!noc.near.net!news3.near.net!eisner!cloutier
From: [e-mail] (Steve Cloutier - Notes 'R Us)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: High Efficiency MOSFET HF Transmitter
Message-ID: <1995Jun19.133911.10309@eisner>
Date: 19 Jun 95 13:39:11 -0400
References: <1995Jun14.125209.10242@eisner> <3rtjbs$[e-mail]>
Organization: DECUServe
Lines: 14

In article <3rtjbs$[e-mail]>, Jim Potter <[e-mail]> writes:
> I have used power MOSFETS (4 IRF840 in parallel) to drive the cathode of
> a 3CPX1500A7 to achieve 40 kW pulsed rf at 2 MHz up to 1% duty factor and
> up to 100 usec pulse width.  You might want to contact your International
> Rectifier rep to get info on their new low charge series, with about half
> the capacitance/gate charge of comparable devices.  I have experience

Thanks for the info!  I'll check it out.

Regards,
        Steve, KA1SI




From [e-mail] Mon 19 Jun 95 16:52:50
Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!mv!usenet
From: [e-mail] (Andy Borsa)
Subject: Re: LCCALC.EXE for RF tank ccts
Message-ID: <[e-mail]>
Nntp-Posting-Host: moose.mv.com
Sender: [e-mail] (System Administrator)
Mime-Version: 1.0
Organization: RF Design Consultant
Date: Sat, 17 Jun 1995 20:23:28 GMT
References: <3rajlu$[e-mail]> <[e-mail]> <[e-mail]>
X-Newsreader: WinVN 0.99.3
Lines: 10
Xref: grape.epix.net alt.radio.pirate:8564 sci.electronics:131464 rec.radio.amateur.homebrew:7827

In article <[e-mail]>, [e-mail] says...
>Please explain the second part ("... even in the can") to me; my english
>is not so good to grasp the joke.

"The can" is where you go to think about the universe and how you would
run it, usually about once a day unless you're constipated.

--
    Andy Borsa -- !!!The universe is discretely analog!!!


From [e-mail] Mon 19 Jun 95 16:52:52
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Linear amps and purity of sine wave?
Date: 17 Jun 1995 07:30:15 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 46
Sender: [e-mail]
Message-ID: <3ruec7$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi John,

There was a thread about bias on amplifiers here a while ago, it would
answer some of your questions I'm sure.

>Now most of my low-level (Class A) stages give a close resemblance to a
>sine wave up to their rated power, and clip cleanly at their limits.  But
>the above mentioned PA, with the original bias circuit, gives only about
4
>watts with reasonable cleanness; above that, it looks god-awful, but a
>peak still shoots up to about 9 watts (probably limited by my 1 watt
>driver).  Of course, this looks fine after filtering, but would this have
>a snowball's chance in hell of measuring decently in a 2-tone test?
(Which
>I am not yet equipped to do, otherwise I would have done it :-) ).

Probably it won't look too good on a two tone.

>Adding an adjustable bias circuit (string of diodes to provide about 1.8
>volts, feeding a pot which feeds a pass transistor) makes it possible to
>get a clean sine wave up to about 6 watts, but of course at the price of
>Class A operation! (About 2 amps idling current gives me no noticeable
>change in waveform till 5 watts) Beyond this limit, the clipping is much
>more smooth as peaks continue up to the 9 watt limit -- a sharply angled
>flat topping making for a fairly "pointy" waveform, but muuuuuuch better.


You should do ok in class AB or very close to B *if* the bias source is
stiff enough. I've rarely been sucessful with a simple diode and pot
circuit for more than one or two watts. The stiffer the bias source and
the closer it tracks the device temperature changes, the less you need to
waste power in standing current.

Be sure the devices you are using are linear devices also.

>My hunch says to use this amp in Class A for a nice driver for my CCI
>140-watt amplifier (based on Motorola AN762), but it made me wonder if
>class AB amps really look that bad on a sine wave before filtering!  The
>only other amp I had to compare was my Ten Tec Argosy -- with no filter,
>the 5 watt driver (class AB) was real clean, and the 50 watt PA showed a
>flattening with about a 45 degree tilt throughout the power range from 0
>to 50.

>: John

73 Tom

From [e-mail] Mon 19 Jun 95 16:52:52
Path: grape.epix.net!news.sprintlink.net!ratty.wolfe.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Loafer Radios
Date: 19 Jun 1995 17:47:45 GMT
Organization: Wolfe Internet Access, L.L.C.
Lines: 7
Message-ID: <3s4d81$[e-mail]>
NNTP-Posting-Host: a012m.adsnet.net

Hi, just wondering if anyone has any info on low frequency radios-
the type that you don't need a license for and aroun 300Khz  or so.
I am trying to find out if there is any activity in WA. state and
also where to find the eguipment, etc..
email replies to: [e-mail]
Thanks!
-Dave

From [e-mail] Mon 19 Jun 95 16:52:53
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!decwrl!adobe!usenet
From: Stephen Schiller <[e-mail]>
Subject: Looking for GaAsFETs to buy
Message-ID: <[e-mail]>
Sender: [e-mail] (USENET NEWS)
Organization: Adobe Systems Incorporated
Date: Sat, 17 Jun 1995 02:40:51 GMT
Lines: 15

Hi,

If anyone knows of, or is, a source for GaAsFETs
in small quntites (like 3 or 4) please let me know.
Preferably HP-made, but I will settle for anything at this point.
(These will be used to build some VCOs, one with a center
frequency around 2.5GHz and another with a center frequncy
around 3.5GHz.  If you have some other parts for doing this,
I might be interested those.)

Thanks,
Steve

([e-mail])


From [e-mail] Mon 19 Jun 95 16:52:54
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.moneng.mei.com!uwm.edu!news.alpha.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Microwave parts suppliers?
Date: 19 Jun 1995 03:49:04 GMT
Organization: Alpha.net -- Milwaukee, WI
Lines: 9
Message-ID: <3s2s3g$[e-mail]>
NNTP-Posting-Host: mdmr19a.trcaccess.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Looking for some parts for the 2mbit / 10ghz datalink featured in last years handbook.  Unfortunatly the primary part needed is a NEC
ND751AAM Gunn transciever and is apparntly no longer being offered.  Any suggestions on alternitives or places to go looking for it
would be appreciated.  Also suggestions on where to go to find radio parts like a 1N5139  Varactor Diode.  None of the places I normally
deal with seem to offer anything but the digital stuff.

Thanks
Mark
KB9JMZ


From [e-mail] Mon 19 Jun 95 16:52:55
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.cac.psu.edu!news.pop.psu.edu!hudson.lm.com!newsfeed.pitt.edu!dbisna.com!psinntp!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Microwave parts suppliers?
Message-ID: <[e-mail]>
Date: 19 Jun 95 09:40:57 EST
References: <3s2s3g$[e-mail]>
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 28

In article <3s2s3g$[e-mail]>, [e-mail] writes:
[posting filled to fit on my 80 col screen]
> Looking for some parts for the 2mbit / 10ghz datalink featured in last
> years handbook.  Unfortunatly the primary part needed is a NEC
> ND751AAM Gunn transciever and is apparntly no longer being offered.
> Any suggestions on alternitives or places to go looking for it
> would be appreciated.  Also suggestions on where to go to find radio
> parts like a 1N5139  Varactor Diode.  None of the places I normally
> deal with seem to offer anything but the digital stuff.
>
> Thanks
> Mark
> KB9JMZ
>

For the Gunn transciever, check the hamfests. I've bought equivalent parts for
about $10 each. They're surplus motion detector heads from commercial door
openers and security systems. Brands are Alpha, Solfan and others.

Newark Electronics sells 1n5139's. They go for about $5, I think. Newark has
a $25 minimum order and will do credit cards. Newark's number is [phone].
Ask for a catalog - they carry a lot of RF parts.

Have fun!
Joe - AA3GN
--
Joe Landis - Systems and Network Manager - North American Drager - Telford, PA
[e-mail]

From [e-mail] Mon 19 Jun 95 16:52:56
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <3rish1$[e-mail]> <[e-mail]>
Date: Sat, 17 Jun 1995 04:32:14 GMT
Lines: 34
Xref: grape.epix.net rec.radio.amateur.antenna:11216 rec.radio.amateur.homebrew:7811 rec.radio.amateur.misc:80938 rec.radio.amateur.digital.misc:8981

In article <[e-mail]> [e-mail] (Greg Dolkas) writes:
>Imagine my surprise a few years ago when my wife mentioned, off hand,
>that one of our wall switches was warm...  Turned out that the electrician
>didn't like to use wire nuts, and instead had used these little crimp rings
>to bond wires together.  Over time, any circuit with significant current
>would corrode due to the relatively small contact area, which generated heat,
>corroding it more, etc.  By that time the black tape used to insulate the
>joint was toast.  Shortly after fixing that box, we got a reminder to check
>the rest of the house *now*; a similar junction behind the smoke alarm down
>the hall got toasty enough to set off the alarm.  I found two others that were
>well on their way, and decided to replace *all* connections with wire nuts.

When using crimp ferrules, the wires are supposed to be twisted then
crimped. The crimp is only to assure the wires don't untwist. It's not
intended to be the only electrical connection. This is a secure wiring
method when done correctly. Normally, this method is only required on
safety ground wiring, but it is acceptable practice for other wiring if
extra insulation is applied.

Wire nuts often suffer from insecure connections too, and can be a real
hazard if not properly used. Electricians use wire nuts because they
are quick, not because they are good. Ferrule crimps are required on
safety grounds because they are good, even though they are a pain to
apply properly.

You suffered from an incompetent electrician, not from a faulty wiring
practice.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |

From [e-mail] Mon 19 Jun 95 16:52:57
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Path: grape.epix.net!news.sprintlink.net!mv!usenet
From: [e-mail] (L. M. Rappaport)
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Message-ID: <[e-mail]>
Nntp-Posting-Host: lmr.mv.com
Sender: [e-mail] (System Administrator)
Organization: MV Communications, Inc.
Date: Sat, 17 Jun 1995 18:41:31 GMT
References: <3r4qj0$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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[e-mail] (Gary Coffman) wrote:

>In article <[e-mail]> [e-mail] (L. M. Rappaport) writes:

>>Where my scheme breaks down at the moment is that the tower has two
>>individual ground rods and there is one on each of three guy wires.
>>I'd guess that could cause a loop, eh?

>Connect them in a star at the tower base, and then connect that
>point back to the star at the house. A star of stars is an acceptable
>topology.

The guys are steel and not insulated from the tower.   In addition,
the tower base is also grounded.  I can connect all those grounds as a
star which then connects to the star at the house, but doesn't the
tower + grounds constitute 3 loops in the tower star?

IE, if the tower is grounded, a guy wire is grounded, and connecting
each of those to another, common, star create a loop?

Thanks, Gary,

Larry


--
Larry Rappaport W1HJF
[e-mail]
[e-mail]


From [e-mail] Mon 19 Jun 95 16:52:59
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Path: grape.epix.net!news.sprintlink.net!mv!usenet
From: [e-mail] (L. M. Rappaport)
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Message-ID: <[e-mail]>
Nntp-Posting-Host: lmr.mv.com
Sender: [e-mail] (System Administrator)
Organization: MV Communications, Inc.
Date: Sun, 18 Jun 1995 17:49:55 GMT
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[e-mail] (Gary Coffman) wrote:

...edited

>It's a circle, but it's not a ground loop.

>A ground loop occurs when two current meshes share a common
>element.

>If we eliminate the shared impedance by collapsing the buss to
>a star, the ground loop goes away.

>The guy wires don't represent a ground loop because there aren't
>two current meshes.

>                 x-------------(SL1)
>               / | \             |
>              /  |  \            |
>             /   |   \           |
>            /    |    \          |
>           /     |     \         |
>           x-/\/-x-/\/--x--------x
>           |Rg1  |  Rg2 |
>           |_____*______|
>                star

>Where Rg1 and Rg2 are the impedances of the individual strips
>of Earth connecting the guy anchors with the tower base. These
>are shorted by the star connection and can be ignored. The
>current source is SL1 which represents a lightning bolt flowing
>current to Earth. The current will divide at the tower top, with
>some flowing down the tower, some flowing down one guy, and some
>flowing down another. The guys are in *parallel* with the tower
>between Earth and sky. There's only one current mesh, and no
>ground loop. The tower looks like the common element of our
>ground loop example above, but it isn't because all the currents
>are flowing in one mesh.

>Now if the star were missing, and some piece of equipment's
>current mesh bridged a guy anchor and the tower base across
>Rg1 or Rg2, *then* you'd have a ground loop. Currents flowing
>across Rg1 would induce a potential that would be seen in
>the equipment current mesh, and alter the current flowing
>through that mesh. By starring the grounds, we short circuit
>that possibility.

Ok, now I understand.  It's the common point obtained by tying the
bottom of the guys and tower together in a star which changes the
configuration from a loop to a "mesh".  In turn by tying the mesh into
a the star at the house entrance panel eliminates the loop which might
be formed between the two stars were they not connected.

Thanks for the help, Gary.

73, Larry
--
Larry Rappaport W1HJF
[e-mail]
[e-mail]


From [e-mail] Mon 19 Jun 95 16:53:00
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Path: grape.epix.net!news.sprintlink.net!mv!usenet
From: [e-mail] (L. M. Rappaport)
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Message-ID: <[e-mail]>
Nntp-Posting-Host: lmr.mv.com
Sender: [e-mail] (System Administrator)
Organization: MV Communications, Inc.
Date: Mon, 19 Jun 1995 15:42:48 GMT
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In any case, by effectively shorting (bridgeing to a common point) the
tower base and the three guy wires, eliminates the possiblity for
ground loops, correct?  Bascially, all grounds go to a common point
(by the utility meter) and are starred out from there.

I'm going to have to do a little rework this summer.  I've been lucky
so far!

Larry
--
Larry Rappaport W1HJF
[e-mail]
[e-mail]


From [e-mail] Mon 19 Jun 95 16:53:01
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ao974
From: [e-mail] (Dave Scobie)
Subject: NEEDED: Class C 1-10w AMP schematic
Message-ID: <[e-mail]>
Sender: [e-mail] (Dave Scobie)
Reply-To: [e-mail] (Dave Scobie)
Organization: The National Capital FreeNet
Date: Sun, 18 Jun 1995 21:03:15 GMT
Lines: 14


I am looking for a good 1-10 watt Class C transistor amp circuit for my
college Telecommunications course. The teacher is not a ham, nor is he
very experienced at building amplifiers (He admitted to me that he has
never built one.) Rather than get stalled de-bugging a troublesome circuit,
I am hoping that one of you clever people out there can give me some
advice on a proven design and help me avoid a potential disaster.
Thanks for reading my posting, and have a good day, eh?
73 de va3ae
--
He's got a coast to coast fever and a highway on his mind.
                                   ( Borrowed from David Wiffen)

                   73 de va3ae

From [e-mail] Mon 19 Jun 95 16:53:01
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF design layout
Date: 17 Jun 1995 07:32:05 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <3ruefl$[e-mail]>
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Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi Pato,
Que pasa los perro nagas?
Tom

From [e-mail] Mon 19 Jun 95 16:53:02
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Soldering Copper to Aluminum
Date: 17 Jun 1995 12:55:13 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 15
Message-ID: <3rujbh$[e-mail]>
References: <[e-mail]> <augxt01-240295174443@47.226.128.144> <3rp9jg$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>Here's a trick I've used for years to solder copper to aluminum.
>The trick is to tin the aluminum first *under oil*.

>You'll need a *lot* of heat, I use a 300 watt
>American Beauty Iron,

Hi Gary,

Fine on you description, but how well does your method work with
the braid of coax cables, particularly with the low-loss types
with foam dielectric?

73, Moritz DL5UH

From [e-mail] Mon 19 Jun 95 16:53:03
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Soldering Copper to Aluminum
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <augxt01-240295174443@47.226.128.144> <3rp9jg$[e-mail]> <[e-mail]> <3rujbh$[e-mail]>
Date: Sat, 17 Jun 1995 21:19:45 GMT
Lines: 29

In article <3rujbh$[e-mail]> [e-mail] () writes:
>In article <[e-mail]>,
>Gary Coffman <[e-mail]> wrote:
>>Here's a trick I've used for years to solder copper to aluminum.
>>The trick is to tin the aluminum first *under oil*.
>
>>You'll need a *lot* of heat, I use a 300 watt
>>American Beauty Iron,
>
>Hi Gary,
>
>Fine on you description, but how well does your method work with
>the braid of coax cables, particularly with the low-loss types
>with foam dielectric?

It doesn't work well at all. The heat needed to tin the aluminum
will melt the foam. This will be true of any soldering method
of aluminum jacketed foam dielectric cables. Aluminum is just
too good a thermal conductor. This is even a problem with copper
jacketed foam dielectric cables, but copper wicks solder so well
that you can usually make it work without melting too much of
the dielectric.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |

From [e-mail] Mon 19 Jun 95 16:53:05
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.charm.net!sun.cais.com!news1.mnsinc.com!news
From: [e-mail] (David Allen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Soldering Copper to Aluminum
Date: Sun, 18 Jun 1995 06:30:00 GMT
Organization: Monumental Network Systems
Lines: 63
Message-ID: <3s0h53$[e-mail]>
References: <[e-mail]> <augxt01-240295174443@47.226.128.144> <3rp9jg$[e-mail]> <[e-mail]>
NNTP-Posting-Host: allent.mnsinc.com
X-Newsreader: Forte Free Agent v0.55

[e-mail] (Gary Coffman) wrote:

>In article <3rp9jg$[e-mail]> [e-mail] writes:
>>In <augxt01-240295174443@47.226.128.144>, [e-mail] (Garry Taylor) writes:
>>>In article <[e-mail]>, [e-mail]
>>>(Muenzler, Kevin) wrote:
>>>> [e-mail] (William Fawns) WRITES:0
>>>> >Can anyone tell me how to solder aluminum to copper? If you prefer, you
>>>> >can e-mail your response to [e-mail].
>>>> You can't solder copper to aluminum.
>>>  I have soldered copper to aluminum, so you can't say you can't do it.
>>>  A special type of flux is required to do the job.
>>
>>    I am in the air conditioning trade where this comes up more often and it a real pain
>> to deal with. There are low temp solders, the flux is acid-based, electrical connections
>>shouldn't be made with acid-based flux, but thats not all...
>>     Aluminum needs to be extremely clean. Sandpaper is needed. The oxide layer is
>>very tough. This oxide rapidly reforms and will ruin any soldering job. I have never
>>tried a soldering iron as a heat source (for aluminum). A torch may be necessary to
>>apply heat fast and evenly before the oxide reforms.
>>     All in all, I'd try mechanical connections with a antioxidizing compound between
>>the two metals.

>Here's a trick I've used for years to solder copper to aluminum.
>The trick is to tin the aluminum first *under oil*. Transformer
>oil or a high flashpoint mineral oil can be used. Coat the aluminum
>part with oil, sand or scrape the oxide layer away, and tin the
>surface with ordinary solder using a large iron *right through the
>oil*. The oil keeps oxygen away from the aluminum so that oxides don't
>reform and ruin the connection. Once you've tinned the aluminum, you
>can clean off the oil and solder normally to copper. This works great
>for bonding a copper wire to an aluminum chassis, or for joining aluminum
>and copper wires. You'll need a *lot* of heat, I use a 300 watt
>American Beauty Iron, and the oil will likely smoke like crazy,
>so this is best done outdoors.

>There are special aluminum "solders" available, but I find the
>above technique produces a better electrical joint. You've got
>to get that aluminum oxide layer completely off to make a good
>electrical connection. I find you can't do that with a torch.
>The aluminum re-oxidizes too quickly while you're heating it
>because it's not shielded from oxygen. A TIG rig might work Ok.
>You might be able to flood the area with argon while scraping
>away the oxide, and the arc torch would then supply tinning
>heat. Working under oil with an iron is probably more practical
>for most home projects.

>You can use a mechanical bond, but even with NoAloX, the joint
>will become higher in resistance than a properly soldered
>joint as the aluminum oxidizes.

>Gary
>--
>Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary

I've soldered these two metals many times.  The trick in keeping the
al from oxidizing.  Rather than the messy oil bath to keep oxygen out,
I use a torch and a still, preferably stainless steel fine-bristle
brush.  After bringing the area up to temp, CONTINUOUSLY brush
vigorously while maintaining heat and slowly adding solder. The
constant brushing action removes/precludes oxygen.  Once tinned, the
reast is simple.


From [e-mail] Mon 19 Jun 95 16:53:06
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!convex!cnn.exu.ericsson.se!erinews.ericsson.se!sunic!sunic.sunet.se!news.funet.fi!news.cc.tut.fi!proffa.cc.tut.fi!not-for-mail
From: [e-mail] (Kein{nen Paul)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Sources for Cheap Double Sided PC board?
Date: 17 Jun 1995 11:58:17 +0300
Organization: Tampere University of Technology
Lines: 31
Distribution: world
Message-ID: <3ru5f9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: proffa.cc.tut.fi


Dan Tayloe ([e-mail]) wrote:

> I use the "ugly" method of construction where components
> to ground are used to support all other junctions in mid
> air.  The unmodified PC board copper surface then serves
> as a solid sheet of ground plane. This method is very easy
> to work with, no etching required.  ICs are mounted upside
> down, pins up.

While on the subject of double sided PC boards, does anybody know
if double sided stripboards are available in small quantities,
ie 'Veroboards' with the component side covered with a solid
(well, punctured) ground plane. These would be ideal for mounting
DIL packages in RF circuits and possibly usable for mounting
MAR-n MMICs, since the impedance of the strip (or maybe two
strips soldered together) would not be very far from an ideal
50 ohm microstrip transmission line.

In an article in QST within a last few years, there was a construction
article with mentioned that a double sided stripboard was used to
build the prototype. Unfortunately, I have not been able to find that
article again.

                Paul OH3LWR

--
Phone   : [phone]                       Mail: Hameenpuisto 42 A 26
Internet: [e-mail]                      FIN-33200 TAMPERE
Telex   : 58-100 1825 (ATTN: Keinanen Paul)            FINLAND
X.400   : G=Paul S=Keinanen O=Kotiposti A=ELISA C=FI

From [e-mail] Mon 19 Jun 95 16:53:07
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!demon!lfheller.demon.co.uk!Leon
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Sources for Cheap Double Sided PC board?
Date: 17 Jun 1995 11:50:10 +0100
Organization: Home
Lines: 15
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References: <[e-mail]>
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In article <[e-mail]>
           [e-mail] "Dan Tayloe " writes:

> Anyone know of cheap sources of double sided or single
> sided PC board?  I use this as both my chassis and to
> build my circuits on.

I pick this sort of thing up at radio rallies (I think you call them
"ham fests"). 8-)

73, Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.

From [e-mail] Mon 19 Jun 95 16:53:08
Path: grape.epix.net!news.sprintlink.net!demon!lfheller.demon.co.uk!Leon
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Sources for Cheap Double Sided PC board?
Date: 17 Jun 1995 17:14:25 +0100
Organization: Home
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In article <3ru5f9$[e-mail]>
           [e-mail] "Kein{nen Paul" writes:

> Dan Tayloe ([e-mail]) wrote:
>
> > I use the "ugly" method of construction where components
> > to ground are used to support all other junctions in mid
> > air.  The unmodified PC board copper surface then serves
> > as a solid sheet of ground plane. This method is very easy
> > to work with, no etching required.  ICs are mounted upside
> > down, pins up.
>
> While on the subject of double sided PC boards, does anybody know
> if double sided stripboards are available in small quantities,
> ie 'Veroboards' with the component side covered with a solid
> (well, punctured) ground plane. These would be ideal for mounting
> DIL packages in RF circuits and possibly usable for mounting
> MAR-n MMICs, since the impedance of the strip (or maybe two
> strips soldered together) would not be very far from an ideal
> 50 ohm microstrip transmission line.
>
> In an article in QST within a last few years, there was a construction
> article with mentioned that a double sided stripboard was used to
> build the prototype. Unfortunately, I have not been able to find that
> article again.

I recall seeing something on this in RadCom a few years ago. Apparently
Vero *can* supply "unrouted" Veroboard - I think it is single-sided, though,
with no strips - but only for orders of #250 minimum. Some companies
apparently buy it like this for prototyping purposes. Mine doesn't,
unfortunately, although we do a lot of RF prototyping.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.

From [e-mail] Mon 19 Jun 95 16:53:09
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: Sources for Cheap Double Sided PC board?
Reply-To: [e-mail]
Organization: Motorola Satellite Communications
Date: Fri, 16 Jun 1995 20:13:19 GMT
Message-ID: <[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
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Anyone know of cheap sources of double sided or single
sided PC board?  I use this as both my chassis and to
build my circuits on.

I use the "ugly" method of construction where components
to ground are used to support all other junctions in mid
air.  The unmodified PC board copper surface then serves
as a solid sheet of ground plane. This method is very easy
to work with, no etching required.  ICs are mounted upside
down, pins up.

Brand new G10 type PC board is fairly expensive.  A 14" by 24"
double sided sheet can cost about $30.  If not full size
sheets, I would think that there would at least be sources
that have scrap pieces that could be much more reasonable in
price.

Thanks!

- Dan Tayloe, WB0NVB, Phoenix, Az.


From [e-mail] Mon 19 Jun 95 16:53:10
Path: grape.epix.net!news.sprintlink.net!hookup!reptiles.org!westonia!humnet.westonia.com!hduff
Subject: Synthesiser Controller
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Thu, 15 Jun 95 22:21:07 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 37


>
> Has anybody out there got a microcontroler for the Mototola
> frequency systhesiser chips that use a serial interface???
> I am experimenting with the Basic Stamp and would like to use
> a PIC chip......Let's exchange ideas...I would like to use
> these systhesiers in some QRP tranceiver designs I have...
>
> I am good with RF and not so hot with digital design...
>
> Let me know what's happening
>
> Clark Fishman  WA2UNN      [e-mail]


Hi Clark... I have sucessfully used an Intel 8031 micro to control
a Motorola MC145190 serially programmed PLL chip.
Also used and 8031 to control the Kenwood TM-741/742 series of VHF/UHF
modules independant of the radio (same idea...serial programmed).
You basically need 3 parallel I/O lines...CLOCK,DATA and ENABLE.
Toggle the ENABLE line then clock the data in, i bit at a time.
The basic concept is not difficult but the trickier programming comes
into play when you want the thing to be frequency agile as well as
control a display and deal with input from a keypad or rotary encoder.
Let me know if you have any specific questions...
regards...Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]

--
---------------------------------------------------------------------
  HumberNet LSS (Learning Support System) - Humber College, Toronto
     "Tomorrow's communication and learning environment, today"
          Visit our Website at http://humnet.humberc.on.ca/


From [e-mail] Mon 19 Jun 95 16:53:11
Path: grape.epix.net!news.sprintlink.net!demon!lfheller.demon.co.uk!Leon
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Synthesiser Controller
Date: 18 Jun 1995 10:59:25 +0100
Organization: Home
Lines: 19
Sender: [e-mail]
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In article <[e-mail]>
           [e-mail]  writes:

> > Has anybody out there got a microcontroler for the Mototola
> > frequency systhesiser chips that use a serial interface???
> > I am experimenting with the Basic Stamp and would like to use
> > a PIC chip......Let's exchange ideas...I would like to use
> > these systhesiers in some QRP tranceiver designs I have...
> >
> > I am good with RF and not so hot with digital design...

For playing about with the Motorola chips I have used three lines from my
PC parallel port, with a simple program written in C.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.

From [e-mail] Mon 19 Jun 95 16:53:12
Path: grape.epix.net!news.sprintlink.net!matlock.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Synthesizer Controller
Date: 17 Jun 1995 15:02:16 GMT
Organization: -.-. --.-     -.. -..-
Lines: 19
Message-ID: <3ruqpo$[e-mail]>
References: <3rk7t8$[e-mail]> <3rkuj2$[e-mail]>
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Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

In article <3rkuj2$[e-mail]>, [e-mail] says...
>
>What motorola data book did you find this stuff in? I have the motorola
RF
>device databook, and I can't find any of those frequency synthesizer
>chips, one chip receivers, etc... Am I looking in the wrong book?

They are in the Motorola Communications Device Databook. If anyone needs
the program to talk to the MC145170 I have a program that I wrote in
qbasic that uses pin1,2,3 of the parallel port. The program can be easily
modified to talk to the MC145190 and MC145191.

73's
Pieter Ibelings
AC4OP
[e-mail]




From [e-mail] Mon 19 Jun 95 16:53:12
Path: grape.epix.net!news.sprintlink.net!news.primenet.com!news
From: Scott Kramer <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: FM STEREO TRANSMITTER
Date: 18 Jun 1995 17:51:13 GMT
Organization: Primenet
Lines: 7
Message-ID: <3s1p2h$[e-mail]>
NNTP-Posting-Host: ip082.phx.primenet.com

I would like to purchase a stable (non-fading) FM Stereo transmitter.
I can be reached at my e-mail address:  [e-mail].


Thanks, Scott



From [e-mail] Fri 23 Jun 95 21:36:43
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!unixg.ubc.ca!news.bc.net!news.bcit.bc.ca!news
From: Colin Schmutter
Newsgroups: rec.radio.amateur.homebrew
Subject: 2N2156 source
Date: 21 Jun 1995 02:36:51 GMT
Organization: bcit
Lines: 9
Message-ID: <3s80k3$[e-mail]>
NNTP-Posting-Host: ann02.bcit.bc.ca
X-Newsreader: <WinQVT/Net v3.9>

I am looking for a source for 2N2156 or equivalent transistors.

These were originally made by Motorola but have been discontinued.

Any help would be appreciated.

Please reply to [e-mail]

Colin

From [e-mail] Fri 23 Jun 95 21:36:43
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!nexus.coast.net!news.kei.com!ub!galileo.cc.rochester.edu!alfalfa.pas.rochester.edu!tyker
From: [e-mail] (J. Patrick Tyker)
Subject: 3/8 wave 2M vert question
Message-ID: <[e-mail]>
Sender: [e-mail]
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Date: Thu, 22 Jun 95 18:44:01 GMT
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I am seeking information on building a 3/8 wave 2m vertical.  I am planning
to put this outside of the window of my apartment and I don't have room for
a 5/8 wave.  Specifically, I need loading coil demensions and radiator length.

Thanks in advance...

jpt



From [e-mail] Fri 23 Jun 95 21:36:44
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!howland.reston.ans.net!usc!nic-nac.CSU.net!vax.sonoma.edu!harrisok
From: [e-mail] (Ken Harrison)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3/8 wave 2M vert question
Date: 22 Jun 95 17:32:51 -0800
Organization: Sonoma State University
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: vax.sonoma.edu

In article <[e-mail]>, [e-mail] (J. Patrick Tyker) writes:
> I am seeking information on building a 3/8 wave 2m vertical.  I am planning
> to put this outside of the window of my apartment and I don't have room for
> a 5/8 wave.  Specifically, I need loading coil demensions and radiator length.

For the trouble involved, just make a 1/4 wave vertical.  No coils,
simple tuning...

Ken

__________________________________________________________________________
Ken Harrison   ---   [e-mail]   ---   Amateur Radio:  N6MHG
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~





From [e-mail] Fri 23 Jun 95 21:36:45
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.moneng.mei.com!news.ecn.bgu.edu!vixen.cso.uiuc.edu!ux4.cso.uiuc.edu!ahall
From: [e-mail] (Allen John Hall)
Newsgroups: rec.radio.amateur.homebrew
Subject: Building a Home!  (Now that's home Brew...:) (Suggestions?)
Date: 21 Jun 1995 17:14:12 GMT
Organization: University of Illinois at Urbana
Lines: 18
Message-ID: <3s9k14$[e-mail]>
NNTP-Posting-Host: ux4.cso.uiuc.edu

Hello everyone,

I saw a thread a long long time ago about putting stuff in a home that
was going up to make a Ham's life easier.  I'd like to dredge that thread
back up again since my parents are currently building a house.  (Don't worry,
my father is really interested in getting his license, and agrees we should
do stuff now before it's too late).

I remember some talk about conduit, and also about grounds etc...  If
anyone can tell me about anything that they have done to make their life
easier (when they built their home etc.), I'd really appreciate it!

Looking forward to your messages!

Allen Hall    [e-mail]

73


From [e-mail] Fri 23 Jun 95 21:36:46
Path: grape.epix.net!news.sprintlink.net!cc.iu.net!news
From: [e-mail]   (Bill Newkirk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a Home!  (Now that's home Brew...:) (Suggestions?)
Date: 21 Jun 1995 18:36:30 GMT
Organization: Space Coast Amateur Technical Group
Lines: 18
Message-ID: <3s9ore$[e-mail]>
References: <3s9k14$[e-mail]>
Reply-To: [e-mail] (Bill Newkirk)
NNTP-Posting-Host: netport-24.iu.net
X-Newsreader: IBM NewsReader/2 v1.09

In <3s9k14$[e-mail]>, [e-mail] (Allen John Hall) writes:
>I saw a thread a long long time ago about putting stuff in a home that
>was going up to make a Ham's life easier.  I'd like to dredge that thread

probably such things as making sure there's enough electrical service in the ham
shack. running 220 V there as well as 110. maybe even a separate breaker panel
in the room itself along with a kill switch for room power.

maybe a raised floor and a drop ceiling so cables and stuff can be run around
and still make the place look tidy.

deep shelves...

that's a start, i guess.

Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
Melbourne, FL                       duty now for the future of amateur radio


From [e-mail] Fri 23 Jun 95 21:36:46
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!nic-nac.CSU.net!cello.gina.calstate.edu!swrl69.gina.slip.csu.net!timstep
From: Timothy Stephenson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a Home!  (Now that's home Brew...:) (Suggestions?)
Date: 22 Jun 1995 01:34:22 GMT
Organization: Teacher/Disaster Planner
Lines: 10
Distribution: world
Message-ID: <3sahau$[e-mail]>
References: <3s9k14$[e-mail]>
NNTP-Posting-Host: 130.150.1.69
X-UserAgent: 1.1
X-XXMessage-ID: <[e-mail]>
X-XXDate: Wed, 21 Jun 95 01:39:10 GMT

This is just a wild one... but if you haven't put on the roof yet, you
might consider laying in some wire or sheeting just under the shingles
(with connectors into the attic), so that you could just run up a spike
for an antenna.  How much? I have no idea.  Just a thought.

Consider a beefy power line into the office/ham shack.  My laser printer
caused my lights to dim as it cycles.  I suspect that "real" ham rigs
would do the same (I wouldn't know, as my ham shack is a 2m on my belt).

Best of luck!    de Tim   [e-mail]

From [e-mail] Fri 23 Jun 95 21:36:48
Path: grape.epix.net!news.sprintlink.net!news.clark.net!usenet
From: [e-mail] (Richard Todd Perry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a Home!  (Now that's home Brew...:) (Suggestions?)
Date: 21 Jun 1995 22:27:31 GMT
Organization: Clark Internet Services, Inc.
Lines: 49
Message-ID: <3sa6cj$[e-mail]>
References: <3s9k14$[e-mail]> <3s9ore$[e-mail]>
NNTP-Posting-Host: perryrt.clark.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

In article <3s9ore$[e-mail]>, [e-mail] says...
>
>In <3s9k14$[e-mail]>, [e-mail] (Allen John Hall)
wri
>tes:
>>I saw a thread a long long time ago about putting stuff in a home that
>>was going up to make a Ham's life easier.  I'd like to dredge that thread
>
>probably such things as making sure there's enough electrical service in the
ham
>shack. running 220 V there as well as 110. maybe even a separate breaker
panel
>in the room itself along with a kill switch for room power.
>
>maybe a raised floor and a drop ceiling so cables and stuff can be run around
>and still make the place look tidy.
>
>deep shelves...
>
>that's a start, i guess.
>

Yup.. How about placing GOOD grounding rods THROUGH the poured foundation. You
might have to add a few feet to the rods to make it work, but it should be a
real great ground.
        Also, make a window-like thing for antenna leads, etc... What I'm
thinking of is kinda hard to explain, but it would go through the wall outside
the normal windows, have a slide open/shut feature, and be adequately
weather-stripped, but still accessable.

        Of course, the most important thing is access to the kitchen.....

8^)

Good luck!

R. T. Perry
>Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
>Melbourne, FL                       duty now for the future of amateur radio
>

--
                        Regards,
                        R. T. Perry
                        KF4BAL
                        GMOO
- The world is divided into two groups of people: Those that own HP's
and those that yell "HEY! Where's the equals sign?"


From [e-mail] Fri 23 Jun 95 21:36:48
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!vixen.cso.uiuc.edu!newsrelay.iastate.edu!news.iastate.edu!richeych
From: [e-mail] (Carlton H Richey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a Home!  (Now that's home Brew...:) (Suggestions?)
Date: 22 Jun 1995 03:49:11 GMT
Organization: Iowa State University, Ames, Iowa USA
Lines: 33
Message-ID: <3sap7n$[e-mail]>
References: <3s9k14$[e-mail]>
NNTP-Posting-Host: educ1.iastate.edu

In article <3s9k14$[e-mail]>,
Allen John Hall <[e-mail]> wrote:
>Hello everyone,
>
>I saw a thread a long long time ago about putting stuff in a home that
>was going up to make a Ham's life easier.  I'd like to dredge that thread
>back up again since my parents are currently building a house.  (Don't worry,
>my father is really interested in getting his license, and agrees we should
>do stuff now before it's too late).
>
>I remember some talk about conduit, and also about grounds etc...  If
>anyone can tell me about anything that they have done to make their life
>easier (when they built their home etc.), I'd really appreciate it!
>
>Looking forward to your messages!
>
>Allen Hall    [e-mail]
>
>73
>


        I have a basic suggestion.  Pour the concreate for the tower
while the cement trucks and excavation equipment are still around.

        Any other thoughts?

        73,
Carl Richey
KB0QOQ

--


From [e-mail] Fri 23 Jun 95 21:36:49
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!usc!nic-nac.CSU.net!vax.sonoma.edu!harrisok
From: [e-mail] (Ken Harrison)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a Home!  (Now that's home Brew...:) (Suggestions?)
Date: 21 Jun 95 22:12:40 -0800
Organization: Sonoma State University
Lines: 33
Message-ID: <[e-mail]>
References: <3s9k14$[e-mail]> <3s9ore$[e-mail]> <3sa6cj$[e-mail]>
NNTP-Posting-Host: vax.sonoma.edu

In article <3sa6cj$[e-mail]>, [e-mail] (Richard Todd Perry) writes:
>       Also, make a window-like thing for antenna leads, etc... What I'm
> thinking of is kinda hard to explain, but it would go through the wall outside
> the normal windows, have a slide open/shut feature, and be adequately
> weather-stripped, but still accessable.

My "shack" is in one of the bedrooms that is used for my shack/office (well,
shack/homework headquarters. ;-)

I run my antenna cables through the vents up underneath the eaves, through some
attic space and down through a small hole that I've cut in the wallboard of the
ceiling in what used to be the closet.  I took the doors of the closet off and
have a desk and shelves set up in there for my radio stuff.  It is like the ham
stuff is recessed into the wall.  Just route the cables through and underneath
the insulation.  No pain, no strain... and the wife doesn't see any holes in
the "wall".  Ha!

>       Of course, the most important thing is access to the kitchen.....

Or better still...  one of those mini-refrigerators, and a Mr. Coffee... ;-)
right in the shack!

73,
Ken

__________________________________________________________________________
Ken Harrison   ---   [e-mail]   ---   Amateur Radio:  N6MHG
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~






From [e-mail] Fri 23 Jun 95 21:36:50
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!reuter.cse.ogi.edu!news.ssd.intel.com!chnews!ornews.intel.com!mcd1.fm.intel.com!usenet
From: Ken Mason <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a Home!  (Now that's home Brew...:) (Suggestions?)
Date: 22 Jun 1995 20:27:58 GMT
Organization: Intel Corporation, Folsom CA, USA
Lines: 64
Message-ID: <3scjoe$[e-mail]>
References: <3s9k14$[e-mail]> <3sap7n$[e-mail]>
NNTP-Posting-Host: kmasonpc.fm.intel.com

 In article <3s9k14$[e-mail]>,
 Allen John Hall <[e-mail]> wrote:
 >Hello everyone,
 >
 >I saw a thread a long long time ago about putting stuff in a home that
 >was going up to make a Ham's life easier.  I'd like to dredge that thread
 >back up again since my parents are currently building a house.  (Don't worry,
 >my father is really interested in getting his license, and agrees we should
 >do stuff now before it's too late).
 >
 >I remember some talk about conduit, and also about grounds etc...  If
 >anyone can tell me about anything that they have done to make their life
 >easier (when they built their home etc.), I'd really appreciate it!
 >
 >Looking forward to your messages!
 >
 >Allen Hall    [e-mail]
 >
 >73
 >

Allen,

 I'll be building a house in the next 6 to 12 months. The
future QTH is happily called "HAM Hill". The house will
contain a ham shack room.

 The main goal I have is letting my wife watch TV or be on
the telephone without any interference from running legal
limit on bands 160M through 1296. Here is my ides on the
subject.

 Exterior construction will use stucco (here in
California). With stucco construction I intend to solder
all that chicken wire together and ground it! Hopefully this
will help with the neighbor interference.

 The telephone wiring will use shielded wiring. 75 ohm hard
line for the TV antenna, NO PRE-AMPS! Possibly considering
running conduit to/from the radio room.

 The radio room of course will have 220V and 110V. It will
have a near shield room effect. This is accomplished by
using that thin sheet metal (or corrugated metal roofing
material) between the wall studs of the room (of course all
soldered and grounded). The flooring will have a layer of
sheet metal or even better copper. All this because the room
will be on the second floor.

 The coax will be pre-run inside the radio room walls to
where the antennas are going. All the pre-run coax will be
1.25 inch hard line.

 Anybody's comment is welcome as I'm still developing ideas.
Also someone with experience in improving shielding and
interference from just plain overload (not harmonics) from
the radios would be great!


                      73,
                        Ken
                      KC6TEU
             [e-mail]


From [e-mail] Fri 23 Jun 95 21:36:51
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.primenet.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: CCI 70cm Linear Kit
Date: 21 Jun 1995 12:45:01 GMT
Organization: Primenet
Lines: 5
Message-ID: <3s948d$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip008.phx.primenet.com
X-Newsreader: IBM NewsReader/2 v1.09

        I have purchased the 100w CCI 70cm Linear kit and about to start assembling it. Advice on the care
and feeding would be gratefully recieved.
        I will be driving the amp with a Yaseu 726.

        Jim [e-mail]

From [e-mail] Fri 23 Jun 95 21:36:52
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!tuegate.tue.nl!sun3!jurgene
From: [e-mail] (Jurgen van Engelen)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.homebrew
Subject: Dutch legislation - Info Wanted
Date: 23 Jun 1995 10:15:28 GMT
Organization: Eindhoven University of Technology, Dept. of Electrical Engineering
Lines: 19
Sender: jurgene@sun3 (Jurgen van Engelen)
Message-ID: <3se480$[e-mail]>
NNTP-Posting-Host: sun3.eeb.ele.tue.nl
Xref: grape.epix.net rec.radio.amateur.policy:28244 rec.radio.amateur.homebrew:7907

Hi,

Im planning to build/purchase a wireless RS232 modem to connect 2 PC's
over a distance no more than 200m. Does anybody have any experience
in this kind of communications? Also, I would like to know the
legislation concerning low-power short-distance tranceivers in the
Netherlands. (Power/Frequencies...)

Hallo,
Ik ben van plan een draadloze RS232 modem te bouwen/kopen om 2 PC's te
koppelen over een afstand van max. 200m. Heeft iemand ervaring met
soortgelijke zenders/ontvangers? Ook zoek ik informatie over de
wetgeving / regelingen op het gebied van korte afstand tranceivers in
Nederland. (vermogen/frequentie-banden/keuringen).
BVD.


Jurgen van Engelen
[e-mail]

From [e-mail] Fri 23 Jun 95 21:36:53
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!psgrain!news.tek.com!emerald.cse.tek.com!royle
From: [e-mail] (Roy W Lewallen)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Ferrite design equations
Date: 23 Jun 1995 00:53:00 GMT
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 44
Distribution: world
Message-ID: <3sd39c$[e-mail]>
NNTP-Posting-Host: emerald.cse.tek.com
Xref: grape.epix.net sci.electronics:132209 rec.radio.amateur.homebrew:7901

[e-mail] (Jeff Albom):

>[good design equations]

>Core materials good for high frequency power transformers (various
>manufacturers): Reccommended frequency of operation is core specific
>(see manufacturer's data)

>3C8, 3B7, 24B, 77, 78, 75, F, T, H7C1, N27

A frequently misunderstood point about using ferrites is that there are
several uses in which they're operated well above their "recommended"
frequency range. Generally, the "recommended" range is the range of
frequencies over which the core is relatively low loss (high Q). In
broadband transformers, high Q isn't necessary and, in fact, is often
undesirable. So "low-frequency" ferrites are often used for this application.
At high frequencies, "low-frequency" ferrites (e.g. Fair-Rite 70-series)
look more like a resistor than an inductor. But the impedance per turn
squared is high. As long as the impedance is high enough, it doesn't
matter that it's resistive instead of inductive. The impedance stays
relatively constant for several decades of frequency instead of rising
to a resonant point then dropping, like a good-quality inductive winding
would.

Another HF application of "low-frequency" ferrites is in EMI suppression.
The ferrite presents little impedance at low frequencies, but looks
like a resistor over a wide range of higher frequencies. This makes it
quite free of resonance effects and ringing which would occur if a high-
frequency ferrite is used.

One other point. The resistive nature of "low-frequency" ferrites at high
frequencies means that they're lossy. If the current through the winding
is low in value, as in a properly designed and applied current balun, the
loss is small. Poorly sized, designed, or applied baluns can overheat at
high power levels due to excessive current. If you look at the
manufacturer's data for impedance and calculate the amount of heat for a
given current, you can see that when a "low-frequency" core overheats due
to the resistive loss at HF, the flux density is way below saturation.
Overheating of cores is frequently blamed on saturation, but at HF is
almost always due to other causes.

73,
Roy Lewallen, W7EL
[e-mail]

From [e-mail] Fri 23 Jun 95 21:36:54
Path: grape.epix.net!news.sprintlink.net!cam.news.pipex.net!pipex!soap.news.pipex.net!pipex!edi.news.pipex.net!pipex!demon!plains.demon.co.uk!nick
From: nick button <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM demodutator - any good chips?
Date: Wed, 21 Jun 1995 18:15:22 GMT
Organization: Myorganisation
Lines: 19
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: plains.demon.co.uk
X-Broken-Date: Tuesday, Jun 20, 1995 19.37.12 GMT
X-Newsreader: Newswin Alpha 0.6

HI,

I think the CA3089 or 3189 is available from maplin ut you will get low
s/n as it's primary purpose is for broadcast WBFM.

Suggest you look at something like the MC3357 or MC3359. They have a
built-in mixer to convert down to 455kHz, so all you need to add is a
10.245 Mhz crystal, a murata ceramic filter plus a few R's & C's...

Have fun !

G4IRX
---------------------------------------------------------------------------
| Nick Button              |                                              |
| Nottingham, G.B.         |     [e-mail]                  |
|                          |  (standard disclaimer applies...)            |
---------------------------------------------------------------------------


From [e-mail] Fri 23 Jun 95 21:36:55
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!news.cerf.net!mvb.saic.com!netnews.wku.edu!netnews.wku.edu!nntp
Newsgroups: rec.radio.amateur.homebrew
Subject: Glass solar panel
Message-ID: <[e-mail]>
From: Pat Moore <[e-mail]>
Date: 22 Jun 95 11:20:06 CDT
Organization: Western Kentucky University
Nntp-Posting-Host: moore.marketing.wku.edu
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=us-ascii
Lines: 10

I picked up a glass solar panel at Dayton and they gave me some little
brass clips to attach to the sides of the panel as contacts.  They keep
slipping off.  Does anyone know how to attach secure contacts to the
panel to get the juice out of it?  I'm trying to get it hooked up to
recharge a gel-cell this weekend so our club can get those extra points.

Pat Moore, AL7L
[e-mail]
502-793-0470


From [e-mail] Fri 23 Jun 95 21:36:55
Path: grape.epix.net!news.sprintlink.net!nexus.coast.net!news.kei.com!bloom-beacon.mit.edu!panix!not-for-mail
From: [e-mail] (Peter Reiner)
Newsgroups: rec.radio.amateur.homebrew
Subject: how to isolate HT from auto power spikes?
Date: 23 Jun 1995 14:44:48 -0400
Organization: PANIX Public Access Internet and Unix, NYC
Lines: 8
Message-ID: <3sf230$[e-mail]>
NNTP-Posting-Host: panix.com
X-Newsreader: TIN [version 1.2 PL2]


I'm powering my HT from the cigarette lighter, and although there are no
problems with noise, I'm afraid of volage spikes from the
alternator or starter blowing out the radio.
Would it suffice to put a 35 volt Metal Oxide Varistor in paralell
with the radio, or do I need a sink resistor somewhere also?
There *is* a fuse on the lighter plug.
Thanks for any advice.

From [e-mail] Fri 23 Jun 95 21:36:58
Path: grape.epix.net!news.sprintlink.net!simtel!zombie.ncsc.mil!news.duke.edu!solaris.cc.vt.edu!news.netins.net!westlyon
From: [e-mail] (West Lyon Community School District)
Newsgroups: rec.radio.amateur.homebrew
Subject: I.C.'s FOR SALE.  CHEAP.
Date: 20 Jun 1995 17:55:27 GMT
Organization: INS Information Services, Des Moines, Iowa, USA
Lines: 82
Message-ID: <3s722f$[e-mail]>
NNTP-Posting-Host: worf.netins.net
X-Newsreader: TIN [version 1.2 PL2]




I am going into the Navy in a month and would like to get rid of some of
the I.C.'s and various other components my father has gotten for me at
work.  I'll Say this up front, I don't want very much for this stuff,
just maybe enough to take my lady out for dinner.  (COD only - you pay
shipping.)

E-Mail me at:

        [e-mail]

I have almost anything you could want.  The list goes something
like this:

1101A      256x1 OLD SRAM(50+)
1802       MPU(4)
146805E2   MPU(4)
2016 2Kx8  SRAM (15)
2102       1Kx1 OLD SRAM(70+)
239        VOltage Comparator
2716       2Kx8 EPROM (100+)
2907       Freqfuency to Voltage Converter(50+)
324        Basic Op-AMP (100+)
4011       Quad 2 input NAND (100+)
4012       Dual 4 Input NAND (100+)
40161      Binary Counter(100+) Just like 74161.
4093       Quad 2 input NAND SCHMITT TRIGGER(150+)
4538       Dual One Shot (75+)
4541       Programable Timmer (150+)
7403       Quad 2input NAND (100+)
7404       HEX Inverter Gates (75+)
7407       HEX Buffer - Open Collector (High Voltage)  (75+)
7408       Quad 2 Input AND (75+)
7409       Quad 2 input AND Open Collector (75+)
7411       Tripple 3 Input AND (75+)
74123      Dual One-Shot (75+)
7414       Hex Schmitt Tigger Inverter (75+)
74180      9-bit Parity Generator/Checker (75+)
74192      4 - bit BCD Counter (100+)
74193      4-bit Binary Counter (100+)
7427       Tripple 3 input NOR (75+)
7440       Dual 4 INPUT NAND (75+)
7446       BCD to 7 Segment Display Driver/Interface
7451       Dual 2 Wide 2 Input AND-OR-INVERTER Gate (75+)
7476       Dual JK FLIP FLOP (75+)

H11AA2    Optical Isolator (75+)
74C926  4 DIGIT 7 Segment Display Driver with an on chip counter and latch

7 Segment LED Displays (Common Cathode) (500+)  <- Yes, 500+.


I also have many misc EPROMs pulled from non working mother boards.  Plus
I have many ADC DAC's from various sources (Alot from MAXIM).

There are also some specialty one of a kind items I have.  For example an
SRAM that is shadowed by EEPROM.  This allows you to save the SRAM's
contents as you wish (AT 5 VOLTS.)  This is a SIMTEK nvSRAM.

I also have a few of the famous FRAMs from  Ramtron.  These are truely
NON Volital RAM devices (but you are limited to something like 1 Million
read or write cycles.)

I would also like to get rid of my Data Book Library.  I have full sets
from Intel (1989) and National Semiconductor.  (You haven't seen a data
book till you see National Semiconductor's simple databooks - beats the
heck out of Motorola's books.)  Yes, I have a lot of Motorola books too.
I have books from TI, SIMTEK, RAMTRON, LATTICE, DALLAS, AMD, NEC...

Also, I have 2 breadboards (Each contains 4  6" Individual Bread boards
mounted on aluminum).  I have Jumpers (LOTS) to go with them in a new
plasic box.

Included in this one time deal I also have my componet boxes.  The 5
boxes contain resistors, capasitors, voltage regulators, variable
resistors, LED's, Switches, Connectors...


If you want everything ... it totals about 10+ boxes (12x12x18) in our shed.


From [e-mail] Fri 23 Jun 95 21:37:00
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!cam.news.pipex.net!pipex!edi.news.pipex.net!pipex!sunic!sunic.sunet.se!trane.uninett.no!due.uninett.no!rapid.fi.uib.no!fred
From: [e-mail] (Fred-Johan Pettersen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Is there a FAQ for this group?
Date: 23 Jun 1995 10:56:40 GMT
Organization: Department of Physics, University of Bergen
Lines: 27
Message-ID: <3se6l8$[e-mail]>
NNTP-Posting-Host: polar.fi.uib.no

Hi

I'm new to this group, and have been watching it for only a week or so.
I wonder if there is a FAQ available. I'm planning to start learning
morse so that I can get my license. I also want to build my own receiver,
and maybe a transmitter late on. I would be happy if any out there could
help me with schematics, PCB layouts, etc. for radios. Hints and guidelines
for constructing my own equipment are also welcome. I want to start with
frequencies below 100MHz.



Sinserely

Fred-Johan Pettersen

--
Fred-Johan Pettersen  Phone: Office: [phone]
Fysisk institutt             Home:   [phone]
Universitetet i Bergen       Fax:    [phone]
Allegt. 55                   E-mail: [e-mail]
N-5007 Bergen          Or: [e-mail]
WWW: http://www.uib.no/People/nfyfp/fred.html
=========================================================
Remember: Lindyhoppers do it on the floor...
IRMA 1000 medlem nr. 1952
=========================================================

From [e-mail] Fri 23 Jun 95 21:37:00
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Loafer Radios
Date: 22 Jun 1995 09:43:23 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <3sbs1r$[e-mail]>
References: <3s7e64$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com


[e-mail] wrote:
>
> Hi, just wondering if anyone has any info on low frequency radios-
> the type that you don't need a license for and aroun 300Khz  or so.
> I am trying to find out if there is any activity in WA. state and
> also where to find the eguipment, etc..

I built my own converter and transmitter several years ago and was able to
work 20 miles or so reliabily.

Here in the Atlanta area (a quiet rural county) I can copy beacons near
Macon and Cape Haiteras (sp??) so I can hear stuff a hundred miles to two
hundred miles away on my ICOM 751A. I think contacts might be few and far
between unless you get a buddy on.

73 Tom

From [e-mail] Fri 23 Jun 95 21:37:01
Path: grape.epix.net!news.sprintlink.net!demon!pacsat.demon.co.uk!slewis
From: Simon Lewis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for GaAsFETs to buy
Date: Fri, 23 Jun 1995 20:59:10 GMT
Organization: None
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: pacsat.demon.co.uk
X-Broken-Date: Saturday, Jun 17, 1995 21.19.45
X-Newsreader: Newswin Alpha 0.7

In article: <[e-mail]>  Stephen Schiller <[e-mail]> writes:

>
> Hi,
>
> If anyone knows of, or is, a source for GaAsFETs
> in small quntites (like 3 or 4) please let me know.
> Preferably HP-made, but I will settle for anything at this point.
> (These will be used to build some VCOs, one with a center
> frequency around 2.5GHz and another with a center frequncy
> around 3.5GHz.  If you have some other parts for doing this,
> I might be interested those.)
>
> Thanks,
> Steve
>
> ([e-mail])
>
>
>

Why Gasfets? They are expensive for the job u want.
Better to use a trannie like BFR91/96 or maybe even a mimic!

Whats the VCO - I maybe able to help further


--
+-------------------------------------------------------------------------+
|  73 From:  Simon Lewis GM4PLM - Helensburgh - Strathclyde - Scotland    |
| Packet: GM4PLM @ GB7SAN.#78.GBR.EU   Email: [e-mail]   |
| AMSAT - UK Member 4282     **** SUPPORT YOUR LOCAL AMSAT GROUP ****     |
+-------------------------------------------------------------------------+


From [e-mail] Fri 23 Jun 95 21:37:02
Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Spice-based Simulator
Date: Wed, 21 Jun 95 08:31:28 PDT
Organization: Northwest Nexus Inc.
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>  <[e-mail]>
NNTP-Posting-Host: blv-pm3-ip10.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In article <[e-mail]>,
<[e-mail]> writes:
> Path:
news.halcyon.com!nwfocus1.wa.com!uunet!mr.net!news.mr.net!skypoint.com!news.cyb
erstore.ca!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.
oz.net!news.lei.net!coconut!rahul.net!a2i!sierra.net!d225-brockway.sierra.net!u
ser
> From: [e-mail] (Robert Tetrault)
> Newsgroups: rec.radio.amateur.homebrew
> Subject: Re: Looking for Spice-based Simulator
> Date: Wed, 14 Jun 1995 16:25:53 -0700
> Organization: Engineered Solutions
> Lines: 7
> Message-ID: <[e-mail]>
> References: <[e-mail]>
<[e-mail]>
> NNTP-Posting-Host: 204.94.234.225
>
> In article <[e-mail]>, Jay
> Wicklund <[e-mail]> wrote:
>
> I myself strongly recommend the version of SPICE produced by Spectrum
> Software in Silicon Valley, 408 738 4387, fax [phone].  It is
> available for all versions of PC and Power PC, and the eval version is
> only 250 USDollars, runs 25 nodes, full function, and FAST!
>
It always amazes me just how confused things get.  I never "strongly
recommended" any spice program.  I did mention, with disclaimers of not having
tried, two moderatly priced packages.  HOWEVER, SPECTRUM SOFTWARE WASN'T ONE
OF THEM.  Methinks that someone is trying to phony up some product
recommendations to increase sales.  Let's have a little more care (or perhaps
a little more honesty).....73  Jay


From [e-mail] Fri 23 Jun 95 21:37:03
Path: grape.epix.net!news.sprintlink.net!cc.iu.net!bb.iu.net!blombard
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: MicroCap Evaluation Version?
Date: 21 Jun 1995 02:09:42 GMT
Organization: InternetU, Inc., Palm Bay, FL
Lines: 22
Message-ID: <3s7v16$[e-mail]>
NNTP-Posting-Host: bb.iu.net
X-Newsreader: TIN [version 1.2 PL2]


I'm looking for info from someone who has, or knows about, the Microcap
evaluation version.  They say that it can handle 25 nodes for $250.  Do
they mean that the total of the main circuit and any subcircuit that it
calls has to be 25 or less?  Or do they mean you can model a larger circuit
if you break it up into 25 node subs?

If they mean the first case, how can you do anything with 25 nodes?  I
have a filter I'd like to model, but the opamp macromodels have more than
25 nodes each!  And I need two opamps to model it.

Suggestions for another simulator that can handle more nodes (maybe 100?)
would be very much appreciated.


Tnx es 73,
Bob


--
Bob Lombardi    WB4EHS from Melbourne, FL (>- ))))))|||    [e-mail]
................................Trying hard to live in an OJ-free zone

From [e-mail] Fri 23 Jun 95 21:37:04
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!fnnews.fnal.gov!unixhub!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MicroCap Evaluation Version?
Date: 21 Jun 1995 20:08:33 GMT
Organization: Stanford Amateur Radio Club
Lines: 41
Message-ID: <3s9u81$[e-mail]>
References: <3s7v16$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <3s7v16$[e-mail]> [e-mail] (Bob Lombardi) writes:
>
>I'm looking for info from someone who has, or knows about, the Microcap
>evaluation version.  They say that it can handle 25 nodes for $250.  Do
>they mean that the total of the main circuit and any subcircuit that it
>calls has to be 25 or less?  Or do they mean you can model a larger circuit
>if you break it up into 25 node subs?
>
>If they mean the first case, how can you do anything with 25 nodes?  I
>have a filter I'd like to model, but the opamp macromodels have more than
>25 nodes each!  And I need two opamps to model it.
>
>Suggestions for another simulator that can handle more nodes (maybe 100?)
>would be very much appreciated.
>
>
>Tnx es 73,
>Bob
>
>
>--
>Bob Lombardi   WB4EHS from Melbourne, FL (>- ))))))|||    [e-mail]
>................................Trying hard to live in an OJ-free zone

I think I paid less than $50 for the student version of MicroCap.
That was about a year ago. It sounds very much like what you are
calling the evaluation version.

I have modeled several active filters using the student version
which have included up to 3 OpAmps.  I don't think the macromodel
nodes are included.  At least not the ones in the standard library.


You might check the book store at your local university for
MicroCap and I have also seen some inexpensive spice simulators
and texts.

Steve Muther, WF6R [e-mail]
                   [e-mail]



From [e-mail] Fri 23 Jun 95 21:37:05
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!networx.com!eskimo!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: MicroCap Evaluation Version?
Message-ID: <[e-mail]>
Organization: Eskimo North (206) For-Ever
References: <3s7v16$[e-mail]>
Date: Wed, 21 Jun 1995 15:56:23 GMT
Lines: 38

in <3s7v16$[e-mail]>, Bob Lombardi wrote:

: I'm looking for info from someone who has, or knows about, the Microcap
: evaluation version.  They say that it can handle 25 nodes for $250.  Do
: they mean that the total of the main circuit and any subcircuit that it
: calls has to be 25 or less?  Or do they mean you can model a larger circuit
: if you break it up into 25 node subs?

: If they mean the first case, how can you do anything with 25 nodes?  I
: have a filter I'd like to model, but the opamp macromodels have more than
: 25 nodes each!  And I need two opamps to model it.

The Microcap Student Edition is published by Addison-Wesley.  A paperback
book with a diskette in a pouch.  The book is sparse, as it's expected
to be used in a class with some sort of teachers manual.  There's a fairly
restrictive shrinkwrap license, for what that's worth.

I've got the Microcap III version that cost somewhere around $40 a
couple of years ago.  I've see Microcap IV on the shelf at the
local schools bookstore.

It has op amps models built in, so each op amp connects to 3 nodes.
The node limit in this version is 30.

I have a lot of fun blowing it up with math exceptions.  It's sensitive
to the node order.

You can get older spice version (2G6 ?) for both MS-DOS 386 machines
on a Simtel archive ftp://oak.oakland.edu.  Or for Linux on the
sunsite archive.  The sunsite package has the users manual in a file.
(I've not got around to using it.)

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






From [e-mail] Fri 23 Jun 95 21:37:06
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!sierra.net!squaw-d125.sierra.net!user
From: [e-mail] (Robert Tetrault)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MicroCap Evaluation Version?
Date: Thu, 22 Jun 1995 22:09:35 -0700
Organization: Engineered Solutions
Lines: 31
Message-ID: <[e-mail]>
References: <3s7v16$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 204.94.233.125

> in <3s7v16$[e-mail]>, Bob Lombardi wrote:
>
> : I'm looking for info from someone who has, or knows about, the Microcap
> : evaluation version.  They say that it can handle 25 nodes for $250.  Do
> : they mean that the total of the main circuit and any subcircuit that it
> : calls has to be 25 or less?  Or do they mean you can model a larger circuit
> : if you break it up into 25 node subs?
>
> : If they mean the first case, how can you do anything with 25 nodes?  I
> : have a filter I'd like to model, but the opamp macromodels have more than
> : 25 nodes each!  And I need two opamps to model it.
>
The evaluation version is a full functioned and libraried package with
documentation identical to the full-on package.  While the limitation of
25 nodes can be limiting in some circumstances, like a Level 3 model, or
even a FET that may have as much as eight nodes, the  circuits can usually
be simplified with time or voltage dependent switches for FETs or the
Level 1 op amp models, unless every single operating characteristic of an
op amp is drawn into battle when you consider this filter.  I have
successfully designed resonant mode and current mode switching regulators,
complete with snubbers, coupling coefficients of ferrite cored
transformers, slope compensation, loop gain and phase margins.  Bench
built prototypes worked first pass from the 25 node limit modelled
design.

MicroCap, as an organization, does not discriminate between an evaluating
user and a fully paid commercial user when giving tech support, and they
are generous with their time in any case.  My take-home on them is that
they are seriously intent on helping everyone who calls.  I would
recommend them unreservedly, but you really need at least the eval
version...Some SPICE reading in general is a major help.

From [e-mail] Fri 23 Jun 95 21:37:07
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!uunet!in1.uu.net!news.inhouse.compuserve.com!news.production.compuserve.com!news
From: Tom Genereux <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,alt.sailing.asa
Subject: MOTOR TUNED MOBILE ANTENNAS:
Date: 20 Jun 1995 11:23:41 GMT
Organization: Priviate individual
Lines: 7
Message-ID: <3s6b3t$fjf$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.antenna:11348 rec.radio.amateur.equipment:13440 rec.radio.amateur.homebrew:7881 rec.radio.amateur.misc:81249

Does anyone have any experence with the motor tuned (electric
screwdriver) mobile antennas like the High Sierra type antennas?

Do they work well? any problems with mounting? Do you think they
would work in a Marine mobile situation?

                                Tom KF2ST

From [e-mail] Fri 23 Jun 95 21:37:07
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JimN0OCT)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need LM 380-8 pinout...
Date: 23 Jun 1995 01:59:19 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <3sdl7n$[e-mail]>
Reply-To: [e-mail] (JimN0OCT)

Help!  I need the pinout of the LM 380-8 [8-pin version of the venerable
LM 380] for a Field Day [what else?] project.

Thanks!!

73, Jim N0OCT

QRP'ers eat their dead.....

From [e-mail] Fri 23 Jun 95 21:37:08
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!noc.near.net!news3.near.net!eisner!cloutier
From: [e-mail] (Steve Cloutier - Notes 'R Us)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEEDED: Class C 1-10w AMP schematic
Message-ID: <1995Jun22.133831.10353@eisner>
Date: 22 Jun 95 13:38:31 -0400
References: <[e-mail]>
Organization: DECUServe
Lines: 11

In article <[e-mail]>, [e-mail] (Dave Scobie) writes:
>
> I am looking for a good 1-10 watt Class C transistor amp circuit for my
> college Telecommunications course. The teacher is not a ham, nor is he


what frequency range, band, etc?


Steve, KA1SI


From [e-mail] Fri 23 Jun 95 21:37:09
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!cam.news.pipex.net!pipex!soap.news.pipex.net!pipex!edi.news.pipex.net!pipex!sunic!sunic.sunet.se!columba.udac.uu.se!jubjub.teknikum.uu.se!mikael.landing
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: pcb-cad software
Date: Wed, 21 Jun 1995 09:30:20 UNDEFINED
Organization: Uppsala University
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: jubjub.teknikum.uu.se
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1]

Hi!

Looking for some PCB-cad freeware which leaves as much copper left for ground
as possible. That is, when you start the design it should be copper
everywhere. When you then start adding tracks and padds the software should
automatically take away the copper so one has some space between the tracks
padds and the rest of the copper (ground). This would be very useful when
designing for RF-circuits.

Micke

From [e-mail] Fri 23 Jun 95 21:37:10
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.cig.mot.com!usenet
From: "Charles H. Reichert" <reichert>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: pcb-cad software
Date: 21 Jun 1995 13:45:17 GMT
Organization: Motorola Cellular Infrastructure Group
Lines: 29
Message-ID: <3s97pd$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ounce.rtsg.mot.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1b3 (X11; I; SunOS 4.1.3 sun4m)
To: [e-mail]
X-URL: news:[e-mail]

[e-mail] wrote:
>Hi!
>
>Looking for some PCB-cad freeware which leaves as much copper left for ground
>as possible. That is, when you start the design it should be copper
>everywhere. When you then start adding tracks and padds the software should
>automatically take away the copper so one has some space between the tracks
>padds and the rest of the copper (ground). This would be very useful when
>designing for RF-circuits.
>
>Micke


Ditto here!

        Chuck
--
                        \|/
                        ^ ^
                      ( O O )
                ___.ooO__U__Ooo.___
                 Hmmmm...Could Be!
=====================================================
|   KD9JQ ex KA7IXS,WA8NBD    708-358-3827 Home     |
|    Charles H. Reichert      708-632-6669 Work     |
|      955 Concord Ln.                              |
|  Hoffman Ests., IL. 60195   [e-mail]  |
=====================================================


From [e-mail] Fri 23 Jun 95 21:37:10
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!cam.news.pipex.net!pipex!edi.news.pipex.net!pipex!uunet!newsgate.melpar.esys.com!melpar!phb
From: [e-mail] (Paul H. Bock)
Subject: Sam, N4UAU:  Please e-mail me
Sender: [e-mail] (Melpar News Administrator)
Organization: E-Systems, Melpar Division
Date: Thu, 22 Jun 1995 15:11:30 GMT
Message-ID: <phb.803833890@melpar>
Lines: 8
Xref: grape.epix.net rec.radio.amateur.misc:81412 rec.radio.amateur.homebrew:7900

Sam,

     Lost your e-mail address.  Drop me an e-mail at your convenience.

TNX ES 73,

Paul, K4MSG      [e-mail]


From [e-mail] Fri 23 Jun 95 21:37:11
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!usc!nic-nac.CSU.net!cello.gina.calstate.edu!swrl73.gina.slip.csu.net!timstep
From: Timothy Stephenson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTD plans for 800 MHz ant
Date: 21 Jun 1995 14:28:05 GMT
Organization: Teacher/Disaster Planner
Lines: 3
Distribution: world
Message-ID: <3s9a9l$[e-mail]>
NNTP-Posting-Host: 130.150.1.73
X-UserAgent: 1.1
X-XXMessage-ID: <[e-mail]>
X-XXDate: Wed, 21 Jun 95 14:32:53 GMT

I am hoping for plans on building (cheap) 800 Mhz antennas for disaster
preparedness for my school district.  Any suggestions?  Thanks. -Tim
[e-mail]

From [e-mail] Fri 23 Jun 95 21:37:12
Path: grape.epix.net!news.sprintlink.net!cam.news.pipex.net!pipex!soap.news.pipex.net!pipex!edi.news.pipex.net!pipex!swrinde!elroy.jpl.nasa.gov!usc!nic-nac.CSU.net!cello.gina.calstate.edu!swrl21.gina.slip.csu.net!timstep
From: Timothy Stephenson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTD plans for 800 MHz ant
Date: 21 Jun 1995 17:13:58 GMT
Organization: Teacher/Disaster Planner
Lines: 12
Distribution: world
Message-ID: <3s9k0m$[e-mail]>
References: <3s9a9l$[e-mail]>
NNTP-Posting-Host: 130.150.1.21
X-UserAgent: 1.1
X-XXMessage-ID: <[e-mail]>
X-XXDate: Wed, 21 Jun 95 17:18:46 GMT

Continuing...  I have my own 15 watt Motorola Maxar 80 radio (800 MHz)
that I will be using on District frequencies (I am a disaster planner for
the District).  I will also be making emergency antennas for 25 watt
mobile radios (that we may wish to pull out of their installation for use
outside, for example).  I hope for plans for 1) an omnidirectional
antenna (e.g., the length and diameter of a wire I should use off the end
of a coax connector, and the size of the ground plane), and a directional
antenna (quad? yagi?) for use on the bus that goes to an outlying
community, for use from my home to the District, and for use by a couple
of outlying schools. Any suggestions would be appreciated.  Also, is 50
ohm line standard with 800 MHz?  Respectfully,  -Tim  KC6WGD
[e-mail]

From [e-mail] Fri 23 Jun 95 21:37:12
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!news.trw.com!batman!out
Newsgroups: rec.radio.amateur.homebrew
Subject: WTD: 2 M  Walking Stick Beam
Message-ID: <1995Jun21.132146.1153@batman>
From: [e-mail] (Byron)
Date: Wed, 21 Jun 1995 19:17:59 GMT
Reply-To: [e-mail] (Byron)
Nntp-Posting-Host: 129.193.101.235
Lines: 11

   I am looking for plans to build a 2 meter and 70 cm walking stick
beam. This is the one where the beam elements are removed from holes
drilled in the PVC boom and then stored in the hollow PVC boom with some
end caps when not in use.
   If you have some plans or know where they can be found please post a
reply or e-mail directly.

Thanks for the help. I have been looking for the plans for quite a
while.

Byron

From [e-mail] Fri 23 Jun 95 21:37:13
Path: grape.epix.net!news2.sprintlink.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!nash.pubnix.net!mba!juxta!michael.black
From: [e-mail] (Michael Black)
Date: 22 Jun 95 11:43:28
Newsgroups: rec.radio.amateur.homebrew
Subject: re: WTD: 2 M  Walking Stick Beam
Message-ID: <[e-mail]>
Organization: MtlNet (MBA.org) Juxtaposition BBS
Lines: 53

[e-mail] (Byron) is looking for plans for
a 2m and 70cm beam that can be taken apart and the elements
put in a the PVC boom for storage.

First of all, plenty of small 2m beams have been described in
the ham mags over the years.  I've even seen some meant to be
taken apart for portable use.  There was the "Two-Toter for Two"
in QST back in June or July or August 1971.  A while later, a
simpler and easier to build version was described, under a
similar sounding title.  I think one of them showed up in
at least one of the ARRL books, maybe the FM and Repeater Manual.

I think I've seen some other easy to take apart 2m beams described,
but I can't think of them right now.

70cm beams have also been described over the years, and the smaller
size of the elements makes building them even easier.  I don't recall
seeing any article about building a take apart model.

I can't think of any article off the top of my head that detailed
a combined 2m and 70cm beam, let alone one that is meant for portalbe
operation.

The point to all this is that you've described quite well what is needed
to mechanically build a beam that can be taken apart.  Instead of
searching for plans, why not create it yourself?  Find an artcicle
that tells you how to build the type of beam that you want, and
modify it so it is easily broken down.  Certainly you don't need
someone else to tell you how to buy a piece of PVC tubing for the
boom, and how to screw on the end caps, and in many ways that is
what would make the thing portable.

I once was given a piece of electrical cable maybe four feet long.
It was for high current, and had quite a few strands of thick copper
wire inside.  It's lasted me twenty years for times when I've needed
some thick wire;  I havent' bought a soldering gun tip in all that time.
Anyway, The wire is easy to work with, though it's not sturdy enough
to last outside in the weather.  For a temporary beam such as you want,
it might work well and has the advantage that it's lighter than some
metal.  I was going to say that you could fix a bolt to one side
and then thread the other side when it came out of the boom (and that
would be your removeable piece), but it would be a drag to thread
that length and also to have to turn the nut off and on.  Needs
some other mechanical fastening method.

Or you could use coat hanger wire.  Again, it's easy to come by
and relatively light.  I find it really hard to bend and cut, though.

    Michael  VE2BVW
--
| InterNet: [e-mail]
| Standard disclaimer: The views of this user are strictly their own.



From [e-mail] Tue Jun 27 16:22:38 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: 219 MHz linear hybrid info needed
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
Date: Sun, 25 Jun 1995 19:08:32 GMT
Lines: 18


My databooks are getting a little long in the tooth and
I need to find a suitable modern hybrid amplifier module
for a project I'm designing. I need to take a +11 dBm
linear signal to somewhere in 10-30 watt range. I've found
a module that will do 30 watts with 3 watts drive, but that
means I need an intermediate amplifer. I'd be happier with
a single module that would go from 10 mW directly to 10 watts
or so. Alternatively, I'd be interested in hearing about a
module that will bridge the 10 mW to 3 W gap. Anyone have
any suggestions?

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Jun 27 16:22:39 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!lll-winken.llnl.gov!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!mgate.arrl.org!not-for-mail
From: [e-mail] (Zack Lau)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 219 MHz linear hybrid info needed
Date: 26 Jun 1995 11:55:14 -0400
Organization: American Radio Relay League
Lines: 27
Message-ID: <3sml92$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
X-Newsreader: TIN [version 1.2 PL2]

Gary Coffman ([e-mail]) wrote:

: My databooks are getting a little long in the tooth and
: I need to find a suitable modern hybrid amplifier module
: for a project I'm designing. I need to take a +11 dBm
: linear signal to somewhere in 10-30 watt range. I've found
: a module that will do 30 watts with 3 watts drive, but that
: means I need an intermediate amplifer. I'd be happier with
: a single module that would go from 10 mW directly to 10 watts
: or so. Alternatively, I'd be interested in hearing about a
: module that will bridge the 10 mW to 3 W gap. Anyone have
: any suggestions?

The Mitsubish M67712 only needs about 100 mW to generate
the rated 25 watts at 222 MHz from reports I've gotten.
According to the data sheet for this part, the gain is
just a little less (33 vs 34 W when driven with 300 mW).

A MRF 581 can be used to drive it cleanly with just a few
mW.  The March 1994 QEX has a suitable circuit, though you
could probably do better with an "optimized" version.


--
Zack Lau  KH6CP/1           2 way QRP WAS
                           8 States on 10 GHz
Internet: [e-mail]   10 grids on 2304 MHz


From [e-mail] Tue Jun 27 16:22:40 1995
Path: grape.epix.net!news.sprintlink.net!noc.netcom.net!ix.netcom.com!netnews
From: [e-mail] (Bob)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2M Walking Stick Beam where can I find plans?
Date: 27 Jun 1995 14:04:08 GMT
Organization: Netcom
Lines: 8
Distribution: world
Message-ID: <3sp34o$[e-mail]>
References: <[e-mail]> <3smepd$[e-mail]>
NNTP-Posting-Host: ix-dc7-15.ix.netcom.com

I'm sure this has been asked before but where can I find plans for this
and other compact beam type antennas? I live in an apartment with a
balcony and can't leave an antenna set up all the time. I would like to
experiment with beam type antennas that I can put out on the balcony at
night and take down in the daytime.  This by the way is for receiving
only, for use with a scanner.

Bob Szabo


From [e-mail] Tue Jun 27 16:22:40 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!prodigy.com!usenet
From: [e-mail] (David Covert)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2m? 70cm? How hard?
Date: 26 Jun 1995 19:03:45 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 11
Distribution: world
Message-ID: <3sn0ah$[e-mail]>
NNTP-Posting-Host: inugap4.news.prodigy.com
X-Newsreader: Version 1.2

How hard is it to build VHF/UHF transmitters and recievers? (2m and
70cm)

I realize that 'how hard' is a realitive thing, so how does it compare to
building HF QRP stuff or microprocessor/microcontroller projects?

DAVID COVERT, KB5GOG     [e-mail]
                    -or- [e-mail]
                    -or- [e-mail]
                    Take your pick...



From [e-mail] Tue Jun 27 16:22:41 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!nic-nac.CSU.net!cello.gina.calstate.edu!swrl61.gina.slip.csu.net!timstep
From: Timothy Stephenson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3/8 wave 2M vert question
Date: 25 Jun 1995 21:55:49 GMT
Organization: Teacher/Disaster Planner
Lines: 11
Distribution: world
Message-ID: <3skm15$[e-mail]>
References: <[e-mail]> <[e-mail]> <3si4vh$[e-mail]>
NNTP-Posting-Host: 130.150.1.61
X-UserAgent: 1.1
X-XXMessage-ID: <[e-mail]>
X-XXDate: Sun, 25 Jun 95 22:00:41 GMT

Re: invisible antenna with gain needed:

If you have a patio, you might suddenly develop a hobby of kite-flying,
and make a nice, big, box kite, about 19 1/2 inches on a side, with a
tube of brightly-colored nylon strung between the refelector and driven
element, and another between directors 1 and 2.  This sort of a quad is
extremely easy to build (I did it), but the dimensions escape me at the
moment.  (Email for them if you wish... I'll ferret them out).  Anyway,
you could point it at a favorite repeater site and accept all of the
compliments on your new patio decoration.  Respectfully,   Tim
([e-mail])


From [e-mail] Tue Jun 27 16:22:42 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!library.ucla.edu!unixg.ubc.ca!rover.ucs.ualberta.ca!alberta!adec23!mark
From: [e-mail] (Mark G. Salyzyn)
Subject: Re: 3/8 wave 2M vert question
Organization: Mr Bill Show
Date: Mon, 26 Jun 95 19:47:24 GMT
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.antenna
Lines: 18
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Xref: grape.epix.net rec.radio.amateur.homebrew:7955 rec.radio.amateur.antenna:11466

Followups directed to rec.radio.amateur.antenna.

Garry Foster <[e-mail]> writes:
>On Sat, 24 Jun 1995, J. Patrick Tyker wrote:
>> 1/4 wave I have now is made of about 36 guage berylium-copper wire
>> and 4 lb fishing line.  The ground plane is the steel box that the air
>> conditioner sits in (protrudes out from the building).  The fishing
>> line runs from the top of the 36 ga radiator to the gutter, holding
>> it vertical.
>Why don't you make a 1/2 wave JPOLE in a PVC pipe. Paint the pipe to
>match your house and if any one aske tll them its an ultra sonic burglar
>alarm. Use non metalic paint of course.

Why not make the J Pole out of copper pipe then, using the appropriate
unions. It will look exactly the same once painted, and would have the
additional advantage of a flatter SWR curve due to some broad-banding.

Ciao -- 73 de VE6MGS/Mark -sk-


From [e-mail] Tue Jun 27 16:22:42 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Redneck13)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: @@Radio Shack@@
Date: 27 Jun 1995 14:00:49 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <3sph0h$[e-mail]>
References: <3s1tss$[e-mail]>
Reply-To: [e-mail] (Redneck13)
NNTP-Posting-Host: newsbf02.mail.aol.com

Radio shack now sells a FM 2meter mobile rig, that is around 40-45 watts.
They also sell a 2m HT that puts out 1 to 6 watts.

Jarred Lawler, Native American Redneck
[e-mail]


From [e-mail] Tue Jun 27 16:22:43 1995
From: [e-mail] (Bob Liesenfeld)
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!news.cyberstore.ca!skypoint.com!news3.mr.net!mr.net!medtronic.com!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building a home!  (now
Message-ID: <[e-mail]>
Date: Sat, 24 Jun 1995 01:39:54 -0100
X-FTN-To: [e-mail]
Lines: 13

Hi Allen,
 Don't know how practical some of these are, but here goes: In my dream
ham house there would be..... a central 13.8 VDC supply with remote
sensing run to a standardized wall plate in each room. Not too much
current, just enogh for the endless RF boxes I'm always building to
make a few watts, listen to the BBC etc. Also at least one run of RG-58
or 8 to each room. Multipair cable for intercom, control functions etc.
LOTS of telco lines as well.
 Good luck!
Bob     WB0POQ
  Technology is out of control.........




From [e-mail] Tue Jun 27 16:22:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Building a Home!  (Now that's home Brew...: ) (Suggestions?)
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <3s9k14$[e-mail]>
Date: Sun, 25 Jun 1995 06:41:34 GMT
Lines: 124

In article <3s9k14$[e-mail]> [e-mail] (Allen John Hall) writes:
>I saw a thread a long long time ago about putting stuff in a home that
>was going up to make a Ham's life easier.  I'd like to dredge that thread
>back up again since my parents are currently building a house.  (Don't worry,
>my father is really interested in getting his license, and agrees we should
>do stuff now before it's too late).
>
>I remember some talk about conduit, and also about grounds etc...  If
>anyone can tell me about anything that they have done to make their life
>easier (when they built their home etc.), I'd really appreciate it!

Well, there are a few areas where doing it right while you're building
the home can make things a lot easier later. From the bottom up, here
are some things to consider.

Do the ground field now. If you are going to have a slab, either at
ground level or as a basement floor, make it into a Ufer ground.
A Ufer ground is simple to do but a little hard to explain. As you
know, Earth is a lossy sheet resistance. The greater the number of
contact points you can have, the lower the resistance of the resulting
connection (resistors in parallel have a net resistance lower than that
of any individual resistor). The Ufer ground works in two ways to achieve
this.

First I'd better describe what a Ufer ground is. It's just rebar in
concrete. You want all the rebar in the concrete electrically connected
together, and a connection to that network brought out of the concrete
for your use. One inch diameter rebar is preferred. Twenty feet of it
can handle lightning strike currents. More footage is better of course.

Concrete is generally a better conductor than soil, due to the ionic
content of concrete. So you have this large somewhat conductive slab
in intimate contact with somewhat less conductive Earth, and the slab
in turn contains a network of metal bars in intimate contact with the
concrete and available for your connections via the terminal point you
brought out.

Now the slab conveys charges to Earth in two ways, first by direct
sheet conductance, and second by capacitor action. The latter is
most important for RF while the former is more important for low
frequency and static charges. Since the slab is large, it makes a
much better Earth connection than a few driven rods (resistors in
parallel again).

If you plan towers, install the bases and radial ground systems
now while the backhoes and concrete trucks are available. Also
dig the trenches and lay the conduit for any cable runs between
the towers and the shack. Don't forget a rotproof pull rope in
the conduits.

I'd also recomend a perimeter ground be installed in addition
to any other grounding you do. This is just a 2/0 bare copper
wire buried all the way around the house, out about 4 feet from
the foundation. This will tend to equalize potentials across
the house in the event of a nearby lightning strike.

Now remember, *all* Earth connections must be tied together in
*star*, no daisy chains. Think about this layout while you are
planning it. It will be convienent if your ground window can
serve as the star point. But if that isn't practical or desirable
for some reason, make it possible to run a straight heavy conductor
from the Earth terminal star to the ground window. Outside the
ground window, it is acceptable, and often desirable, to make
a star of stars when laying out the grounding plan. Don't let
this happen *inside* the ground window, however.

Now on to the house itself. The first thing I would do is specify
2x6 wall studs instead of the typical 2x4. This has several benefits
while costing very little extra. First it allows more wall insulation
which will cut down on your heating and cooling bills. Second, and
of interest to hams, it allows fairly large conduits, 4 inch, to be
placed in the walls. Third, it makes the house stronger (couldn't
hurt, right?). Again, don't forget the pull ropes. Plan the conduit
runs to make establishing a ground window simple.

Now for other generic wiring, you should establish a wiring closet
in the house. Run all telco, CATV, home automation, network, alarm
system, etc cabling to this wiring closet. Don't daisy chain from
outlet to outlet, bring everything back to the wiring closet in star.
This will make it trivial to reconfigure if you add phone lines later,
decide to subnet, want to rezone the alarm system, or just need to
troubleshoot wiring problems. Run more wires than you think you'll
ever need. They still won't be enough.

Power. There are never enough outlets, there are always too few
breakers. Put in more outlets than you think you'll ever need,
and use more breakers than you think you'll ever need. Use heavier
gauge wire than the Code requires so that you can upgrade outlets
and breakers later if you find you need more power to a certain
location, IE wire for 30 amps even if you only intend to use 20
amp breakers now. Wire is cheap, putting it in later isn't.

For the ham shack, remember you want a separate power feed here,
with its own master disconnect, and arranged so the power feed
passes through your ground window for suppression. A complete
subpanel is best, with 220 and 110, for both the amplifier and
the rest of the station. (Note any *other* wires that enter
the ham shack have to pass through the ground window too. That
includes telco, network, alarm system, etc. DON'T MISS EVEN
ONE. That's all it takes to ruin your entire protective plan.)

Use GFI outlets in the ham shack and the workshop. They may save
your life one day. Of course follow Code and put them in wet
areas like the bathrooms and kitchen too. If you're feeling
rich, put them everywhere. I think individual GFI outlets are
better than GFI breakers, some electricians may disagree.
Regardless, insist on GFI outlets on the hamshack side of
the ground window, the GFI breakers back in the main panel
will be ineffective past the ground window.

Figure you'll want to add a coffeemaker, a microwave, and
a small refrigerator to the ham shack one day. Leave space
and provisions for power for these vital necessities. A
bathroom should also open immediately off the ham shack.

I could go on and on, and often do, but this hits the high
spots of what you should be thinking about.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Jun 27 16:22:49 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!grian!morris
From: [e-mail] (Mike Morris)
Subject: Re: Building a Home! (Now that's home Brew...: ) (Suggestions?)
Message-ID: <[e-mail]>
Organization: College Park Software, Altadena, CA
References: <3s9k14$[e-mail]> <[e-mail]>
Date: Mon, 26 Jun 1995 20:06:50 GMT
Lines: 150

[e-mail] (Gary Coffman) writes:

>[e-mail] (Allen John Hall) writes:
>>I saw a thread a long long time ago about putting stuff in a home that
>>was going up to make a Ham's life easier.  I'd like to dredge that thread
>>back up again since my parents are currently building a house.  (Don't worry,
>>my father is really interested in getting his license, and agrees we should
>>do stuff now before it's too late).
>>
>>I remember some talk about conduit, and also about grounds etc...  If
>>anyone can tell me about anything that they have done to make their life
>>easier (when they built their home etc.), I'd really appreciate it!

>Well, there are a few areas where doing it right while you're building
>the home can make things a lot easier later. From the bottom up, here
>are some things to consider.

<snip>

>If you plan towers, install the bases and radial ground systems
>now while the backhoes and concrete trucks are available. Also
>dig the trenches and lay the conduit for any cable runs between
>the towers and the shack. Don't forget a rotproof pull rope in
>the conduits.

If your dad has a motor home, consider laying out the back yard and
garage so he can get the motor home into the back yard.  Makes it less
conspicuous to the neighborhood.  One acquatintance of mine designed his
garage with a 10' roll-up door on the front _and on the back_ of the
garage, so he could drive the motor home thru the garage.  Also made
it easy to do work on other vehicles.  He also had a 110v/220v outlet,
RJ-11 phone outlet, sewer cleanout and natural gas line in the patio slab
next to where the motor home would be parked.

>Now on to the house itself. The first thing I would do is specify
>2x6 wall studs instead of the typical 2x4. This has several benefits
>while costing very little extra. First it allows more wall insulation
>which will cut down on your heating and cooling bills. Second, and
>of interest to hams, it allows fairly large conduits, 4 inch, to be
>placed in the walls. Third, it makes the house stronger (couldn't
>hurt, right?). Again, don't forget the pull ropes. Plan the conduit
>runs to make establishing a ground window simple.

I'd specify 2x8s for the exterior perimeter walls.  More insulation.
Lower heating & cooling bills.  And specify that walls between bedrooms
and the adjcent rooms be 2x6, and fiberglass-filled.  Makes it nice and
quiet.

>Now for other generic wiring, you should establish a wiring closet
>in the house. Run all telco, CATV, home automation, network, alarm
>system, etc cabling to this wiring closet. Don't daisy chain from
>outlet to outlet, bring everything back to the wiring closet in star.
>This will make it trivial to reconfigure if you add phone lines later,
>decide to subnet, want to rezone the alarm system, or just need to
>troubleshoot wiring problems. Run more wires than you think you'll
>ever need. They still won't be enough.

Run the utilities underground from the pole to this room - i.e. the
underground conduit from the pole comes to this room.   Read a
good book on EMP, and lightning, and incorporate what you learn
into the phone and CATV feed.

>Power. There are never enough outlets, there are always too few
>breakers. Put in more outlets than you think you'll ever need,
>and use more breakers than you think you'll ever need. Use heavier
>gauge wire than the Code requires so that you can upgrade outlets
>and breakers later if you find you need more power to a certain
>location, IE wire for 30 amps even if you only intend to use 20
>amp breakers now. Wire is cheap, putting it in later isn't.

20 amp outlets have one prong that is a "T" shape, the other is an "I"
shape. 15 amp outlets have two "I" shaped prongs.  The outlets
themselves come in several grades, the top grade is "hospital" grade.
Specify the middle grade - the prongs are tighter, more metal in them.

Put a telephone jack everywhere you will want one - and pull at least
3-pair, if not 6-pair.  The labor is the same, 1,000' of 3-pair
is under $40, 6-pair is under $70.  Mount the RJ-plates in plastic
single-gang outlet boxes, and use 1/2" plastic conduit stubs into the
attic, with a pull rope.  Use double or triple jack plates, and wire
two pair to each jack.  Put an extra outlet box (with a blank plate)
on every wall of every room, with a pull rope.  Home run every cable pull,
be it phone, TV Coax, alarm system, doorbell, stereo speakers, etc.
Use a telco "66" block to terminate the cables for the phone jacks
(called "inside wire" or "station wire" in the trade).

If you have questions about phone wiring, there was a long thread
about phone and home LAN wiring in comp.dcom.telecom recently.  You
might post over there and ask if anybody saved it.

And put a extra phone jack on the front porch (under a weatherproof
flap), and by the back porch (ditto), and in the garage. Put a mini-
toggle switch in the wire closet to cut off the outside jacks.

A friend of mine in Phoenix AZ taught me the trick about the extra
boxes - they are cheap when done before the drywall goes up, and can
come in very handy.  Since he moved in, he has used several: one for AC
power, because the couch blocked one outlet, another for a RG-58 run to
a scanner, and two others for phone jacks he didn't think he'd need
when the plans were laid out.

>For the ham shack, remember you want a separate power feed here,
>with its own master disconnect, and arranged so the power feed
>passes through your ground window for suppression. A complete
>subpanel is best, with 220 and 110, for both the amplifier and
>the rest of the station. (Note any *other* wires that enter
>the ham shack have to pass through the ground window too. That
>includes telco, network, alarm system, etc. DON'T MISS EVEN
>ONE. That's all it takes to ruin your entire protective plan.)

I'd have a panic button by the door that kills all the outlets
except for a clock, and a baby fridge.

>Use GFI outlets in the ham shack and the workshop. They may save
>your life one day. Of course follow Code and put them in wet
>areas like the bathrooms and kitchen too. If you're feeling
>rich, put them everywhere. I think individual GFI outlets are
>better than GFI breakers, some electricians may disagree.
>Regardless, insist on GFI outlets on the hamshack side of
>the ground window, the GFI breakers back in the main panel
>will be ineffective past the ground window.

I like GFI outlets in the bathrooms and kitchen - I saw a note once
that went something like "Nothing is more aggravating to a woman
than to get out of the shower, pick up the hair dryer, and have the
breaker pop, then have to go across the house, down to the basement
(dripping, and in a towel) to reset an <expletive deleted> GFI breaker."

>Figure you'll want to add a coffeemaker, a microwave, and
>a small refrigerator to the ham shack one day. Leave space
>and provisions for power for these vital necessities. A
>bathroom should also open immediately off the ham shack.

All of which make a nice contest station even nicer...
Don't forget the hide-a-bed couch in the ham shack.

>I could go on and on, and often do, but this hits the high
>spots of what you should be thinking about.

>Gary
>--
>Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
>Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
>534 Shannon Way             |    Guaranteed!      | [e-mail]
>Lawrenceville, GA 30244     |                     |
--
Mike Morris   WA6ILQ          | All opinions must be my own since nobody
PO Box 1130                   | pays me enough to be their mouthpiece...
Arcadia, CA. 91077            |
ICBM: 34.07.930N, 118.03.799W | Reply to: [e-mail]


From [e-mail] Tue Jun 27 16:22:50 1995
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!N1IIR.MIT.EDU!stratton
From: [e-mail] (Chris Stratton)
Newsgroups: rec.radio.amateur.homebrew
Subject: DDS & PLL Hybrid Theory
Date: Tue, 27 Jun 1995 00:10:16 Eastern
Organization: MIT
Lines: 49
Message-ID: <[e-mail]>
NNTP-Posting-Host: n1iir.mit.edu
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

Direct Digital Synthesis is too noisy, and Phase Locked Loop
synthesizers don't have a small enough step size for HF use.
So it seems like a popular way to do things is touse DDS to
generate the frequency, but then use a PLL to reproduce a
spectrally clean version of it.

May QST had an article about a "DigiVFO", a DDS using 64
phase accumulator, but only 8 bit output fed to the DAC.
This was okay, because it drove a Drake rig that used
a PLL to clean up the VFO input.  The Harris DDS code producer
chip acutally had 12 output bits, but only 8 were used to keep
the cost down.

By why even bother with 8 bits?  The PLL compares the phase of
the local oscillator and the DDS (the reference).  Why does it's
phase comparator care if the reference is a nice sine wave?  In fact,
wouldn't it be happier with just a square wave?  So why not use
a 1-bit DAC - ie, just feed the phase accumulator MSB into the PLL.

Re-arranging things conceptually, it seems that this is the
same as making a tradition PLL synthesizer capable of
non-integral division factors.  That is, sometimes it divides
by int(f) and sometimes by int(f)+1 with the fractional part
being determined by the occurence ratio of the two divisors.

This seems to be about what a DDS does: the frequency desired
determines how much to increment the phase accumulator.  At 360
degrees it rolls over to zero - but it won't actually hit zero
unless the numbers work out just right.  Instead, the phase
samples actually used progress slowly each cycle.  What
we're acutally doing is dividing the DDS clock by a non-integer -
by selecting an integral multiple of a tiny fraction of that clock.

I'm not sure if this argument makes any sense, much less if it
is correct.  I would guess I'm missing something somewhere which
says that in the DDS/PLL hybrid, the DDS ouput has to at least look
like a reasonable sine wave, not a bunch of pulses that only average
out to being on frequency.

Anyone have any thoughts?  I'm tryin to get my hands on the Harris
DDS code generator, and will see what happens with the MSB driving
a PLL - but if someone can tell me directly why this won't work,
it would save a lot of trouble.

Chris, N1IIR
[e-mail]





From [e-mail] Tue Jun 27 16:22:51 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!network.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS & PLL Hybrid Theory
Date: 27 Jun 95 15:27:24 GMT
Organization: ucsd usenet gateway
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Chris:
        Here is the short answer to your question: In order for the DDS part to
work correctly you MUST convert the DAC output to a sine wave!

        You have missed a subtle part of how the DDS part of the combo works.
The PLL uses the zero crossings of the phase reference to do the phase
comparison.  When the DDS is working much above about 1/100th of the clock
frequency (and especially when operating at less (more?) than 1/10th the clock
frequency) the zero crossings in the fundamental can occur without changing the
most significant bit of the phase accumulator.  Remember that the output of the
DAC is NOT just the fundamental, but several harmonics and alias frequencies.
These spurious frequencies need to be filtered out.  This can be a good low pass
filter if you want DC to about 1/8 the clock frequency for the DDS output.  You
can get REALLY close to 1/2 the clock frequency over a narrow range of
frequencies if you use a narrow bandwidth band pass filter.  The filter filters
out the phase jitter that would be inherent in the DAC output.  If you do an
analysis of the codes that come out for low fractions of the clock frequency
(say 1/3) you will see that the DAC output changes from positive to negative by
some pretty weird values and these zero crossings do not necessarily correspond
to the zero crossings of the desired phase signal.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Tue Jun 27 16:22:52 1995
Path: grape.epix.net!news.sprintlink.net!xnet!site
From: [e-mail] (Douglas Armstrong)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Help with tranciever for 2400 BPS modem
Date: 26 Jun 1995 00:55:23 GMT
Organization: XNet - A Full Service Internet Provider - [phone]
Lines: 33
Message-ID: <3sl0hr$[e-mail]>
NNTP-Posting-Host: cyclone.xnet.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net rec.radio.amateur.equipment:13607 rec.radio.amateur.homebrew:7945

From xnet!site Sun Jun 25 19:46:22 1995
Path: xnet!site
From: [e-mail] (Douglas Armstrong)
Newsgroups: alt.radio.digital
Subject: Help with tranciever for 2600 BPS modem
Date: 21 Jun 1995 02:59:16 GMT
Organization: XNet - A Full Service Internet Provider - [phone]
Lines: 19
Message-ID: <3s81u4$[e-mail]>
NNTP-Posting-Host: cyclone.xnet.com
X-Newsreader: TIN [version 1.2 PL2]

My previous post must not have made it through. (were having trouble with
the server or some provider somewhere)  My question relates to
transievers, I am new to radio and need some direction.  I am currently
building two 2600 BPS modems (using the EXAR chipset XR-2400 with
XR-2443 microcontroller)  These are standard telco modems, but I am
adding audio in and out jacks.  Can I connect these directly to audio
in/out of the transiever?  If I used a 9600/14.4/28.8 modem could I
connect it directly?  What frequency should I look for?  What price
should I expect to pay?  I am building 2 to set up a communications link
between two devices through standard serial ports.  I have heard
*some*thing about a TNC, is this for packet radio?  With my setup will I
be able to access packet radio?  Ack, I am confused.  Will this require
an FCC license, if so where can I get a book to study for it.  I need a
reange of a few miles, but if price is too much I can settle for around
500ft.  Are there any FCC regulations against encrypting my signal?  Can
I keep it up for extendad periods?

That's enough questions, I would really appreciate it if you could Email
me at [e-mail], thanks!




From [e-mail] Tue Jun 27 16:22:55 1995
Path: grape.epix.net!news.sprintlink.net!news.azstarnet.com!sun.cais.com!news1.mnsinc.com!news
From: [e-mail] (David Allen)
Newsgroups: rec.radio.amateur.homebrew
Subject: High Idle on 5.7L GM
Date: Mon, 26 Jun 1995 07:20:15 GMT
Organization: Monumental Network Systems
Lines: 114
Message-ID: <3sln23$[e-mail]>
NNTP-Posting-Host: allent.mnsinc.com
X-Newsreader: Forte Free Agent v0.55


Date of first post/this post:  June 26, 1995/June 26, 1995

DONÆT BE ANNOYED if youÆve seen this before.
I am going to troll with this for a few days.

Also, EXCUSE ME for length of this post.


TO:       SOME SMART PERSON
FROM:     Dave Allen, Falls Church, VA ([e-mail])

Vehicle:  1988 Chev Conversion Van
Engine:   5.7L w/ TBI-220
History:  82K Miles
-   -   - GM Target Trans at 61K July 1993
-   -   - A/C currently inoperable (believed to be unrelated)
-   -   - No maint other than routine


*****************************************************************
Problem:  High Idle - 800-1000 RPM in gear; 1500-2000 in P/N

Bottom Line:  Do I want to mess with this?  Do I have a choice?
*****************************************************************
Background

This HI problem has been driving me nuts.  Began gradually (esp in
P/N) at 55-60K miles, after clogged fuel filter caused surging and
loss of power.  Shortly thereafter, transmission began failing, was
removed, repaired and eventually replaced.


Prime Suspect:  Idle Air Control valve

Recently cleaned & TBI bore.  Ran service manual test of turning on
key waiting 20 secs for Electronic Control Module (ECM) to command IAC
pintle fully closed in TBI bore & disconnecting IAC lead (visual
inspec shows bullet head to be sticking well into TBI bypass port).
Started engine -- no effect.  Idle cut-off set screw has no effect.


Cause of High Idle

HI can only come from too much air in manifold, right?  If itÆs not
IAC by-pass air, either a vacuum port attachment, the manifold
(unlikely?), the TBI unit or its interface is leaking.  Right?

Svc Man suggests very careful inspection for vac leak.  TBI is heavily
encumbered with accessories & 4-5 manifold ports for EGR, AIR, etc.  I
could not remove the rigid double 1/8 inch tube fitting at the port on
the front of the TBI (for fear of breaking it); it appears secure.  I
was unable to detect leak, but possibly I was not looking in the right
place(s).


Lesser Suspects

Timing is correct & PCV valve appears OK.  I am discounting leaky
injectors; however, fuel consumption is up (because of HI?).  ECM
inputs for P/N switch, A/C relay, and O2 sensor voltage appear
normal..

Without SCAN tool and getting no ALDL codes, am assuming ECM is
properly commanding the IAC.  At any rate, fully closing the IAC has
no effect, so I am concluding physical/mechanical vice
electronic/electrical problem. It this a correct assumption?


Possible Clue?

Throttle Position Sensor (TPS) voltage responsive and within specs
Strangely, when spraying de-gummer agent around outside of TBI, idle
dropped into spec when fluid was continuously sprayed around
TPS/throttle shaft connection.  Was cool spray altering TPS voltage or
was fluid sucked into a vacuum leak around throttle shaft or other
opening?  Seems impossible to inspect this area.

Manual makes mention that *some* TBIÆs have *hidden* dust shields.
Could these have deteriorated?  Could TBI be leaking air elsewhere?  I
lightly snugged 3 manifold attach bolts.  No change.  Could the
TBI/manifold gasket be leaking?


What to Do?

Since I canÆt get the vehicle to pass EMT with the high P/N idle
speed, I suppose I will have to give up & put it in shop, but I hate
like hell to admit defeat and assume the Ben Dover position when I
SUSPECT it may be a *simple* fix.


3 questions --

1.  Has anyone had experience that might provide a key to solving this
problem?

2.  Where can one go for info on this?

3.  Does GM have a *service kit* for TBIÆs that might include seals
and gaskets?  If so, would it be a good idea to try this?  Do I want
to remove the TBI?  In many respects it seems more straight-forward
and simpler in design than a 4-barrel carburetor with calibrated
floats & metering jets, etc.

Any thoughts/advice on this would be helpful. .  An e-mail would be
most appreciated.

For those interested, I would be happy to share whatever I learn.

Dave Allen
[e-mail]




From [e-mail] Tue Jun 27 16:22:55 1995
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!newsmaster
From: [e-mail] (Shima)
Newsgroups: rec.radio.amateur.homebrew
Subject: How 'bout a freq. counter using SB sound card?
Date: 25 Jun 1995 18:59:07 GMT
Organization: Your Organization
Lines: 11
Message-ID: <3skblr$[e-mail]>
References: <3skbfh$[e-mail]>
NNTP-Posting-Host: pppslip5.eel.ufl.edu
X-Newsreader: WinVN 0.93.14



Anyone interested in a frequency counter program using a PC and a SB
sound card?  I am thinking of writing one that may handle frequencies up
to 6kHz.  IT would list all strong frequencies in a given signal over a
set noise threshold.

Any takers?

[e-mail]



From [e-mail] Tue Jun 27 16:22:57 1995
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!N1IIR.MIT.EDU!stratton
From: [e-mail] (Chris Stratton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How 'bout a freq. counter using SB sound card?
Date: Mon, 26 Jun 1995 23:45:59 Eastern
Organization: MIT
Lines: 55
Message-ID: <[e-mail]>
References: <3skbfh$[e-mail]> <3skblr$[e-mail]>
NNTP-Posting-Host: n1iir.mit.edu
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

In article <3skblr$[e-mail]> [e-mail] (Shima) writes:
>Path: senator-bedfellow.mit.edu!bloom-beacon.mit.edu!gatech!usenet.eel.ufl.edu!newsmaster
>From: [e-mail] (Shima)
>Newsgroups: rec.radio.amateur.homebrew
>Subject: How 'bout a freq. counter using SB sound card?
>Date: 25 Jun 1995 18:59:07 GMT
>Organization: Your Organization
>Lines: 11
>Message-ID: <3skblr$[e-mail]>
>References: <3skbfh$[e-mail]>
>NNTP-Posting-Host: pppslip5.eel.ufl.edu
>X-Newsreader: WinVN 0.93.14




>Anyone interested in a frequency counter program using a PC and a SB
>sound card?  I am thinking of writing one that may handle frequencies up
>to 6kHz.  IT would list all strong frequencies in a given signal over a
>set noise threshold.

>Any takers?

>[e-mail]

I think what you mean is you want to do an audio frequency
spectrum analyzer.  A project like this was published in
QST a while back, but using a custom audio input, before
the Sound Blaser type boards became common.

Basically, what you need to do is calculate a Discrete Fourrier
(not sure about spelling) Transform or DFT at a number of
different frequencies.  You do this by in software generating
sine and cosine waves at each of the desired frequencies.  Then
you multiply each sample from the soundblaster by the sine and
cosine and store the results in seperate x and y accumulator
arrays (one element for each freq. of interest).  Let it accumulate
for a little while, then calculate each magnitude by sqr(x^2+y^2).
Rezero the accumulator arrays, and do it again - over and over.

You'd probably need to write in assembly language, although C
might work as well.  Getting it to run under windows would be
a real pain.  The faster your computer, the more discrete frequencies
you can divide your band into.  The tricky part of the coding is
remembering to subtract the DC offset of the input, and figuring
out a way to multiply the 2's compliment numbers.  Fortunately,
you only have to take the square root one per frequency at the end,
in order to get the answer.

I'd write the program (I once tried, but didn't know enough
then to get it to work) but I don't have a soundblaster.

Chris, N1IIR
[e-mail]



From [e-mail] Tue Jun 27 16:22:58 1995
Path: grape.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!coconut!makai.maui.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How 'bout a freq. counter using SB sound card?
Date: 27 Jun 1995 13:25:49 GMT
Organization: Maui Net
Lines: 38
Message-ID: <3sp0st$[e-mail]>
References: <3skbfh$[e-mail]> <3skblr$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: maui46.maui.net
X-Newsreader: IBM NewsReader/2 v1.09

In <[e-mail]>, [e-mail] (Chris Stratton) writes:
>In article <3skblr$[e-mail]> [e-mail] (Shima) writes:
>>Anyone interested in a frequency counter program using a PC and a SB
>>sound card?  I am thinking of writing one that may handle frequencies up
>>to 6kHz.  IT would list all strong frequencies in a given signal over a
>>set noise threshold.
>
>>Any takers?
>
>>[e-mail]
>
>I think what you mean is you want to do an audio frequency
>spectrum analyzer.  A project like this was published in
>QST a while back, but using a custom audio input, before
>the Sound Blaser type boards became common.
>
>I'd write the program (I once tried, but didn't know enough
>then to get it to work) but I don't have a soundblaster.
>
[deleted]
>
>Chris, N1IIR
>[e-mail]

I remember seeing an ad for a program like that.  There were
two versions of the product, about $160/$200 retail, but this
was two years ago.

It could function as spectrum analyzer both in real-time and
from a file.  Runs under Windows.  Real slick graphics.
Don't remember the title or the manufacturer, though.

Anybody remember who made this and what it was called??

Satoshi Manabe/WH6CTO
Kihei, Maui, Hawaii

[e-mail]


From [e-mail] Tue Jun 27 16:22:59 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!gatech!usenet.eel.ufl.edu!newsmaster
From: [e-mail] (Iceman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How 'bout a freq. counter using SB sound card?
Date: 27 Jun 1995 17:13:00 GMT
Organization: Your Organization
Lines: 34
Message-ID: <3spe6s$[e-mail]>
References: <3skbfh$[e-mail]> <3skblr$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pppslip5.eel.ufl.edu
X-Newsreader: WinVN 0.93.14

>Basically, what you need to do is calculate a Discrete Fourrier
>(not sure about spelling) Transform or DFT at a number of
>different frequencies.  You do this by in software generating
>sine and cosine waves at each of the desired frequencies.


It's a Discrete Fourier Transform, and it's WAY too slow.  I have an FFT
algorithm in C that is burning fast.  I can do real time apps with it for
128 and 256 pt. transforms..


>You'd probably need to write in assembly language, although C
>might work as well.  Getting it to run under windows would be
>a real pain.

Windows is a no no, but no assembly is required..  Optimal coding is all
that is necessary :)


 The faster your computer, the more discrete frequencies
>you can divide your band into.  The tricky part of the coding is
>remembering to subtract the DC offset of the input, and figuring
>out a way to multiply the 2's compliment numbers.


Again, why do you have to subtract off the DC?  The DC ends up inthe 1st
FFT bin, just don't look at it if you don't want to!  No need to further
process it..

The coding is the simple part.  The damn limitations of the SB is what is
very annoying..





From [e-mail] Tue Jun 27 16:23:00 1995
From: [e-mail] (Bob Liesenfeld)
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!skypoint.com!news3.mr.net!mr.net!medtronic.com!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to isolate ht from
Message-ID: <[e-mail]>
Date: Sat, 24 Jun 1995 12:36:27 -0100
X-FTN-To: [e-mail]
Lines: 32

RR>From: [e-mail] (Peter Reiner)
RR>Newsgroups: rec.radio.amateur.homebrew
RR>Subject: how to isolate HT from auto power spikes?
RR>Organization: PANIX Public Access Internet and Unix, NYC
RR>Message-ID: <3sf230$[e-mail]>
RR>Date: 23 Jun 1995 14:44:48 -0400
RR>
RR>
RR>I'm powering my HT from the cigarette lighter, and although there
RR>are no problems with noise, I'm afraid of volage spikes from the
RR>alternator or starter blowing out the radio.
RR>Would it suffice to put a 35 volt Metal Oxide Varistor in paralell
RR>with the radio, or do I need a sink resistor somewhere also?
RR>There *is* a fuse on the lighter plug.
RR>Thanks for any advice.
RR>
RR>---
RR> * Origin: HamLink RBBS - 612/HAM-0000 v.34 St. Paul, MN
RR>(1:282/100.0)
Hi Peter,
 Back in the "olden days" when cellular first arrived on the scene, we
had many problems with equipment getting popped by spikes during
starting conditions, esp. in cars with maintenace free batts. The only
sure fire cure we found was to disconnect the A+ to the equipment when
the car was started. Needless to say the customers were not a happy
bunch, but I think you might have a bit less trouble with a cig plug.
Others here may have a better solution.
 Bob     WB0POQ

 Technology is OUT of control.........




From [e-mail] Tue Jun 27 16:23:01 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news.infi.net!europa.chnt.gtegsc.com!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!decwrl!adobe!usenet
From: [e-mail] (Steve Schiller)
Subject: Re: Looking for GaAsFETs to buy
Message-ID: <[e-mail]>
Sender: [e-mail] (USENET NEWS)
Reply-To: [e-mail]
Organization: Adobe Systems Incorporated
References: <[e-mail]>
Date: Tue, 27 Jun 1995 02:09:36 GMT
Lines: 52

In article <[e-mail]> Simon Lewis
<[e-mail]> writes:
> In article: <[e-mail]>  Stephen Schiller
<[e-mail]> writes:
>
> >
> > Hi,
> >
> > If anyone knows of, or is, a source for GaAsFETs
> > in small quantities (like 3 or 4) please let me know.
> > Preferably HP-made, but I will settle for anything at this point.
> > (These will be used to build some VCOs, one with a center
> > frequency around 2.5GHz and another with a center frequency
> > around 3.5GHz.  If you have some other parts for doing this,
> > I might be interested those.)
> >
> > Thanks,
> > Steve
> >
> > ([e-mail])
> >
> >
> >
>
> Why Gasfets? They are expensive for the job u want.
> Better to use a trannie like BFR91/96 or maybe even a mimic!
>
> Whats the VCO - I maybe able to help further
>

Well you are right, there are silicon transistors that could do the
job. But I haven't been able to locate a mail order, or surplus, source
for any of those either.

The fastest transistor I have found is an MRF901, which has an Ft of
around 4 or 5 GHz, and that is close enough to the upper range of one
of my proposed VCOs (4GHz) to make it hard to design a VCO with a *wide*
tuning range. But if you have some hints on how to do this I would be
happy to listen. (The purpose of these VCOs is to make a swept signal
generator from 0 to ~2GHz by mixing signals from 3GHz-2GHz VCO with a
3GHz-4GHz VCO. This, in turn, would then be used in a spectrum analyzer.)

Actually, I think the BFR91 is about as fast as the MRF901. Don't
know about the BFR96. I was looking for something with an Ft around
8GHz.

But I have to admit that another reason I was thinking of GaAsFETs is
that I haven't used any before I wanted to get some experience with
them. Someday I plan to build some equipment that operates at ~10GHz
(radar stuff) where GsAsFETs would be more necessary.

  - S


From [e-mail] Tue Jun 27 16:23:02 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.cig.mot.com!usenet
From: Chuck KD9JQ <reichert>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for GaAsFETs to buy
Date: 27 Jun 1995 16:25:56 GMT
Organization: Motorola Cellular Infrastructure Group
Lines: 16
Message-ID: <3spbek$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ounce.rtsg.mot.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
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To: [e-mail]
X-URL: news:[e-mail]

I may still have a number of MRF-901s or the leaded version MRF-904 device.

        Chuck
--
                        \|/
                        ^ ^
                      ( O O )
                ___.ooO__U__Ooo.___
                 Hmmmm...Could Be!
=====================================================
|   KD9JQ ex KA7IXS,WA8NBD    708-358-3827 Home     |
|    Charles H. Reichert      708-632-6669 Work     |
|      955 Concord Ln.                              |
|  Hoffman Ests., IL. 60195   [e-mail]  |
=====================================================



From [e-mail] Tue Jun 27 16:23:03 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.dacom.co.kr!news.netins.net!news.netins.net!negaard
From: [e-mail] (David Negaard (Oberon-))
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for schematics/plans for homebrew TNC
Date: 26 Jun 1995 21:35:22 GMT
Organization: INS Information Services, Des Moines, Iowa, USA
Lines: 24
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: draagen.graceland.edu

I'm looking for plans for a simple but reasonably-performing TNC.
I've got the skills to etch a board and build the thing, and I might
even be able to lay my hands on a PROM burner, but I need a plan/place
to start.

I'd _like_ one that incorporates or can incorporate a 'standard' modem
disconnect header, and I'd also like one that might be useful for
working PACSATs someday (with appropriate modifications, if
necessary).  It would also be nice if it either had a state machine
DCD or used an XR-2211 (so that I could use the TAPR mod).

Any or all of these extras are negotiable.  What's _not_ negotiable is
at least KISS capability (I'd use a Baycom, otherwise).  I want to use
this with Linux, and KISS _might_ be all I'd need, but I'd still be
happier with more.

Any pointers/tips?  I'm living on a budget that would starve a
field-mouse, so I'm looking to do things on the cheap.  Any help would
be appreciated...
--
o David Negaard                   o [e-mail]
o Help Desk Technician            o http://www.graceland.edu/~negaard
o 700 College Avenue              o linux-phile
o Lamoni, IA  50140               o 73 de KB0PXK


From [e-mail] Tue Jun 27 16:23:03 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!scsing.switch.ch!news.rediris.es!news.uva.es!simu1.ele.cie.uva.es!jesus
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for schematics/plans for homebrew TNC
Date: 27 Jun 1995 10:32:50 GMT
Organization: Universidad de Valladolid (Spain)
Lines: 21
Distribution: world
Message-ID: <3somoi$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: simu1.ele.cie.uva.es
X-Newsreader: TIN [version 1.2 PL2]

David Negaard (Oberon-) ([e-mail]) wrote:
<deleted>

: Any or all of these extras are negotiable.  What's _not_ negotiable is
: at least KISS capability (I'd use a Baycom, otherwise).  I want to use
: this with Linux, and KISS _might_ be all I'd need, but I'd still be
: happier with more.

<deleted>
Why a TNC? You can build a PC ISA bus card with a z8530 SCC and you have
HDLC without TNC, and the drivers are distributed with the new versions
of the Linux kernel, and:

- You can get very high speeds if DMA is used (PI card).
- No eprom programming is needed.
- Some schematic about an opto-isolated SCC card (OptoSCC) are avaiable
(Sorry, I can't remember where are they)
--
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ Jes·s Arias ([e-mail]) $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$


From [e-mail] Tue Jun 27 16:23:04 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.dacom.co.kr!news.netins.net!news.netins.net!negaard
From: [e-mail] (David Negaard (Oberon-))
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for schematics/plans for homebrew TNC
Date: 27 Jun 1995 16:49:05 GMT
Organization: INS Information Services, Des Moines, Iowa, USA
Lines: 31
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <3somoi$[e-mail]>
NNTP-Posting-Host: draagen.graceland.edu
In-reply-to: [e-mail]'s message of 27 Jun 1995 10:32:50 GMT

>>>>> "Jesus" ==   <[e-mail]> writes:

> David Negaard (Oberon-) ([e-mail]) wrote:
>> <deleted>

>> : Any or all of these extras are negotiable.  What's _not_
>> negotiable is : at least KISS capability (I'd use a Baycom,
>> otherwise).  I want to use : this with Linux, and KISS _might_ be
>> all I'd need, but I'd still be : happier with more.

>> <deleted>

Jesus> Why a TNC? You can build a PC ISA bus card with a z8530 SCC and
Jesus> you have HDLC without TNC, and the drivers are distributed with
Jesus> the new versions of the Linux kernel, and:

Jesus> - You can get very high speeds if DMA is used (PI card).  - No
Jesus> eprom programming is needed.  - Some schematic about an
Jesus> opto-isolated SCC card (OptoSCC) are avaiable (Sorry, I can't
Jesus> remember where are they)

This would be ideal!  Alas, archie couldn't find anything under
optoscc, found too much under SCC, and has been generally unhelpful.
Can _anyone_ point me in the right direction for these schematae?
I'll build one in a heartbeat (or as quickly as I can connect enough
aluminium cans to buy the parts).
--
o David Negaard                   o [e-mail]
o Help Desk Technician            o http://www.graceland.edu/~negaard
o 700 College Avenue              o linux-phile
o Lamoni, IA  50140               o 73 de KB0PXK


From [e-mail] Tue Jun 27 16:23:05 1995
Path: grape.epix.net!news.sprintlink.net!newsboy.utelfla.com!news.iag.net!pm1-orl15.iag.net!user
From: [e-mail] (Patrick Stickler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Modifying CB Amp for multiband HF use?
Date: Sun, 25 Jun 1995 14:54:43 -0400
Organization: Orlando, Florida USA
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: pm1-orl15.iag.net


How difficult/feasible is it to modify a CB amplifier (e.g. 5W -> 30W)
for use on multiple HF bands? Is it as simple as replacing the final
filter with several bandswitched filters, or would such an amp not be
suitable for the lower HF frequencies?

Thanks,

=========================================================================
 Patrick Stickler * KC4YYY * Orlando, Florida U.S.A. * [e-mail]
-------------------------------------------------------------------------
 Don't put off until tomorrow what you can do today; for if you enjoy it
 today, you can do it again tomorrow...
=========================================================================


From [e-mail] Tue Jun 27 16:23:06 1995
Path: grape.epix.net!news.sprintlink.net!cam.news.pipex.net!pipex!edi.news.pipex.net!pipex!sunic!sunic.sunet.se!erinews.ericsson.se!usenet
From: [e-mail] (Mike Groves)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modifying CB Amp for multiband HF use?
Date: Mon, 26 Jun 1995 17:09:43 GMT
Organization: Ericsson
Lines: 20
Message-ID: <3smpkn$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pc125011.exu.ericsson.se
X-Newsreader: Forte Free Agent v0.55

[e-mail] (Patrick Stickler) wrote:


>How difficult/feasible is it to modify a CB amplifier (e.g. 5W -> 30W)
>for use on multiple HF bands? Is it as simple as replacing the final
>filter with several bandswitched filters, or would such an amp not be
>suitable for the lower HF frequencies?

>Thanks,

Hi Pat,
These amplifiers can often be 'pulled' (or tuned up) to the 10 Meter
band, but that's about it.  The transistor matching networks are
always too high Q (narrow band) to support multiple band operation.
You'ld be doing good to get it to operate over both the sideband and
FM portions of 10M band at the same time.

Hope this helps,
Mike Groves  KD6PKJ



From [e-mail] Tue Jun 27 16:23:07 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!lll-winken.llnl.gov!venus.sun.com!nntp-hub2.barrnet.net!pacbell.com!amdahl.com!juts.ccc.amdahl.com!bgn00_pc
From: [e-mail] (Bill.Nadzam)
Subject: Re: Modifying CB Amp for multiband HF use?
Message-ID: <3sn03j$[e-mail]>
To: ALL
Sender: [e-mail] (UTS Tech Support)
Organization: spg.amdahl.com
X-Newsreader: News Xpress Version 1.0 Beta #3
References: <[e-mail]> <3smpkn$[e-mail]>
Date: Mon, 26 Jun 1995 19:00:03 GMT
Lines: 42

In article <3smpkn$[e-mail]>,
   [e-mail] (Mike Groves) wrote:
>[e-mail] (Patrick Stickler) wrote:
>
>
>>How difficult/feasible is it to modify a CB amplifier (e.g. 5W -> 30W)
>>for use on multiple HF bands? Is it as simple as replacing the final
>>filter with several bandswitched filters, or would such an amp not be
>>suitable for the lower HF frequencies?
>
>>Thanks,
>
>Hi Pat,
>These amplifiers can often be 'pulled' (or tuned up) to the 10 Meter
>band, but that's about it.  The transistor matching networks are
>always too high Q (narrow band) to support multiple band operation.
>You'ld be doing good to get it to operate over both the sideband and
>FM portions of 10M band at the same time.
>
>Hope this helps,
>Mike Groves  KD6PKJ
>

I have had NO PROBLEMS with the use of CB type amps on 80-10 meters.
The only problem is that the input impedance will become very low at
7 - 3.5 Mhz. This can be fixed by installing about 18 Ohms of series
resistance to the input curcuit. Or by using a cheap 200watt MFJ
antenna tuner. The second problem is that there are no output filters.
The second and third orders will be amplified. If your using a Hi-Q mobile
antenna the amount of power radiated will be very low at the harmonic
frequencies. Don't use a spider antenna without adding output filters.

By the way, most internal antenna tuners like those found in the Yaesu
FT-890/AT or FT-900/AT will not match the input impedance at 7 to 3.5Mhz
without the addition of these series resistors. I have a metron MB-1000B and
it too has series resistors in the input curcuit for this same probelm.

------------------------------------------------
Name: Bill.Nadzam
E-mail: [e-mail] (Bill.Nadzam)
------------------------------------------------



From [e-mail] Tue Jun 27 16:23:08 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!cam.news.pipex.net!pipex!soap.news.pipex.net!pipex!edi.news.pipex.net!pipex!sunic!sunic.sunet.se!erinews.ericsson.se!usenet
From: [e-mail] (Mike Groves)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modifying CB Amp for multiband HF use?
Date: Tue, 27 Jun 1995 01:32:25 GMT
Organization: Ericsson
Lines: 25
Message-ID: <3snn3c$[e-mail]>
References: <[e-mail]> <3smpkn$[e-mail]> <3sn03j$[e-mail]>
NNTP-Posting-Host: pc125011.exu.ericsson.se
X-Newsreader: Forte Free Agent v0.55

[e-mail] (Bill.Nadzam) wrote:

>I have had NO PROBLEMS with the use of CB type amps on 80-10 meters.
>The only problem is that the input impedance will become very low at
>7 - 3.5 Mhz. This can be fixed by installing about 18 Ohms of series
>resistance to the input curcuit. Or by using a cheap 200watt MFJ
>antenna tuner. The second problem is that there are no output filters.
>The second and third orders will be amplified. If your using a Hi-Q mobile
>antenna the amount of power radiated will be very low at the harmonic
>frequencies. Don't use a spider antenna without adding output filters.

I still cannot recommend what you are doing to others.  You are asking
for problems.  What happens to the gain of a bipolar transistor when
you move down in frequency?  Uh, it goes up.  Way up.  Will your
amplifier stay stable with those very high gain conditions?  It all
depends on who designed it.  (Sorry, I just don't put much faith in
11M amp designers.)  Do you even have a spectrum analyzer in line to
find out?  Your bird watt meter wont tell you if you have spurs, but
the FCC will after they recieve a call.  Harmonics are only part of
your concerns.  Severe oscillations can happen quickly and are are
often distructive, then you get to witness a very expensive
flash-bulb.

Mike Groves  KD6PKJ



From [e-mail] Tue Jun 27 16:23:09 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modifying CB Amp for multiband HF use?
Date: 27 Jun 1995 11:07:03 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <3sp6qn$[e-mail]>
References: <3snn3c$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

And be careful if you plan to use one of those CB amps in a linear mode.
The often are thrown together with no consideration for linearity. I would
hate to see the Ham bands cluttered with some of the dirtiest amplifiers
ever produced! Lot's (if not all) of the CB linear amps use no bias at
all, others use very loose poorly designed bias circuits.

My opinion is that these CB amps should be left on CB, unless the guy
doing the mod thoroughly understands what he is doing.

73 Tom


From [e-mail] Tue Jun 27 16:23:10 1995
Path: grape.epix.net!news.sprintlink.net!gatech!purdue!mozo.cc.purdue.edu!constellation.ecn.purdue.edu!wb9omc
From: [e-mail] (Duane P Mantick)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modifying CB Amp for multiband HF use?
Date: 27 Jun 1995 17:24:56 GMT
Organization: Purdue University
Lines: 22
Message-ID: <3spet8$[e-mail]>
References: <3snn3c$[e-mail]> <3sp6qn$[e-mail]>
NNTP-Posting-Host: constellation.ecn.purdue.edu
X-Newsreader: NN version 6.5.0 (NOV)

[e-mail] (W8JI  Tom) writes:

<snip>

>My opinion is that these CB amps should be left on CB, unless the guy
>doing the mod thoroughly understands what he is doing.

        Well, I won't disagree with you on the "dirtiness" of many
"CB" amps (especially the more "garage-company" units).

        BUT - I can tell you that many's the time I wish I had a
solid state amp for 10 meters, about 100 watts.....and can't FIND one.
Build one?  Maybe, but from what I've seen you can wrap up a fair amount
of cash in that for possibly only smoke in return.  I haven't that much cash
to risk.

        Thanks to the crud from CB, it is of course a problem for anyone
to manufacture and sell 10 meters amps.....

Duane
wb9omc



From [e-mail] Tue Jun 27 16:23:10 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usenet.ins.cwru.edu!ukma!rsg1.er.usgs.gov!stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: NEC P-110 CELLPHONE
Date: Tue, 27 Jun 1995 14:41:01 GMT
Organization: Oak Ridge National Lab, Oak Ridge, TN
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: zaek25.ymd.ornl.gov
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

I NEED THE DATA ON THE NEC P-110 CELLPHONE CONNECTOR.

I WANT TO TIE THIS CELLPHONE INTO A SPECIAL CAVE RESCUE COMMUNICATIONS PACKAGE
WHICH INCLUDES MILITARY STYLE FEILD PHONE LINES, AND VOX CONTROL RADIOS.

NEC WILL ONLY RELEASE THIS INFO TO NEC SERVICE SHOPS.

ALSO NEED TO KNOW IF THE CONNECTOR IS AVAILABLE. THE ONLY WAY I CAN GET TO
THIS CONNECOTR NOW IS BY BUYING THE $230 HANDS FREE KIT. I WAS GOING TO BUY
THE CELLABS HANDSFREE HEADSET KIT BUT THEY WENT OUT OF BUSINESS.

DANNY BRITTON
[e-mail]



From [e-mail] Tue Jun 27 16:23:11 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!wmwap1.math.uni-wuppertal.de!usenet
From: limaux <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Data Sheet of LM 1391
Date: 26 Jun 1995 13:34:58 GMT
Organization: University of Wuppertal
Lines: 6
Message-ID: <3smd22$[e-mail]>
NNTP-Posting-Host: wlus7.lingu.uni-wuppertal.de

I am looking for the data sheet of the LM 1391. I have found this
chip in a monitor for Horizontal synchro, i suppose. Please send
the answer in this news group or to :

[e-mail]



From [e-mail] Tue Jun 27 16:23:12 1995
Path: grape.epix.net!news.sprintlink.net!usit.net!usenet
From: Charles Hulen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: need help listings electronics
Date: 26 Jun 1995 03:59:46 GMT
Organization: United States Internet, Inc.
Lines: 9
Message-ID: <3slbbj$[e-mail]>
NNTP-Posting-Host: 199.1.57.35

Don't mean to disturb anyone, but I'm new to using USENET and I can't seem to find any groups
that cater to surplus parts precurment, and elctronic circuit building in general. If anyone
knows of any newsgroups, Websites, etc. could please drop me an "E" at '[e-mail]'?
Any help you could give me would be appreciated. I like to build small
circuits such as sound f/x (w/ speakers or feed to stereo input), etc. Small stuff like you
used to find in Elementary Electronics. Do any of the magazines still publish? Do you have any
 800 numbers/addresses I could to subscribe? Since I can't walk no more, I can get to store to
buy any, been 6 years now and my mom don't know what to look for!



From [e-mail] Tue Jun 27 16:23:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!grian!morris
From: [e-mail] (Mike Morris)
Subject: Re: need help listings electronics
Message-ID: <[e-mail]>
Organization: College Park Software, Altadena, CA
References: <3slbbj$[e-mail]>
Date: Mon, 26 Jun 1995 20:11:00 GMT
Lines: 21

Charles Hulen <[e-mail]> writes:

>Don't mean to disturb anyone, but I'm new to using USENET and I can't seem to find any groups
>that cater to surplus parts precurment, and elctronic circuit building in general. If anyone
>knows of any newsgroups, Websites, etc. could please drop me an "E" at '[e-mail]'?
>Any help you could give me would be appreciated. I like to build small
>circuits such as sound f/x (w/ speakers or feed to stereo input), etc. Small stuff like you
>used to find in Elementary Electronics. Do any of the magazines still publish? Do you have any
> 800 numbers/addresses I could to subscribe? Since I can't walk no more, I can get to store to
>buy any, been 6 years now and my mom don't know what to look for!

First, post using lines less than 78 columns - it makes it a lot easier
to read.
Second, go to sci.electronics - it's just what you are looking for.


--
Mike Morris   WA6ILQ          | All opinions must be my own since nobody
PO Box 1130                   | pays me enough to be their mouthpiece...
Arcadia, CA. 91077            |
ICBM: 34.07.930N, 118.03.799W | Reply to: [e-mail]


From [e-mail] Tue Jun 27 16:23:13 1995
Path: grape.epix.net!news.sprintlink.net!cam.news.pipex.net!pipex!edi.news.pipex.net!pipex!sunic!sunic.sunet.se!trane.uninett.no!Norway.EU.net!telepost.no!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED HELP!  Respond : Grounding 'Experts' !
Date: 25 Jun 1995 06:17:26 GMT
Organization: Telepost Communications A/S
Lines: 17
Message-ID: <3siv1m$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]><[e-mail]> <3sg64v$[e-mail] <3si488$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: drammensnett101.telepost.no
X-Newsreader: IBM NewsReader/2 v1.03

In <3si488$[e-mail]>, [e-mail] (michael silva) writes:
>
>>: Does anyone of the ground experts have a good tip for a shack on the
>>:first floor?
>>:
>>
>>A *real* radio ham would fill up the ground floor with soil.
>>
>And sprinkle it every day to keep it moist...
>
>Mike, KK6GM
>

I'm living in Norway, no need for that, except for a couple of days in the summer.

Thor.



From [e-mail] Tue Jun 27 16:23:14 1995
Path: grape.epix.net!news.sprintlink.net!demon!btnet!uunet!news.iii.net!news
From: [e-mail] (christopher shustak)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need PC board for 30-50 Amp 12 VDC power supply
Date: 25 Jun 1995 16:11:31 GMT
Organization: iii.net subscriber
Lines: 9
Message-ID: <3sk1s6$[e-mail]>
NNTP-Posting-Host: parkcomm.iii.net
X-Newsreader: WinVN 0.92.2

Hi.  N1AUP here.

I would like to build a high current, 13.8 VDC power supply to power my
ham station.  I need a circuit board that will handle the regulation and protection
circuitry for such a project.  Has anyone seen a company who sells such an
item?  I want to build a first class supply using a transformer that I just picked up.

Thanks.
Chris


From [e-mail] Tue Jun 27 16:23:15 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!noc.netcom.net!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: R2 doesn't like low voltage
Message-ID: <[e-mail]>
Keywords: R2 KK7B LM387
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date: Mon, 26 Jun 1995 16:21:40 GMT
Lines: 18
Sender: [e-mail]

A problem with the Rick Campbell R2 receiver design (Jan. 1993 QST)

Trying to run a bit of battery-powered Field Day from home, I was
reminded of a problem I've had with my R2 receiver:  the audio drops out
very suddenly below about 11.9 volts.  And I mean abruptly right at that
voltage!  This obviously creates problems for battery operation.

With my scope, I traced the problem to the LM387 audio preamp stage.  The
stages before this were still working below 11.9 volts.

Anything one can do to re-bias that stage or something? Or do I have a
marginal chip?

[ John Seboldt  [e-mail]  /  Aaaaaahhh....
]       Amateur radio K0JD...       /     BAAAAACH!
[    Church of the Annunciation,   /  (Radar O'Reilly)
]           Minneapolis           /



From [e-mail] Tue Jun 27 16:23:16 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!centralnews1.Central.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!usenet
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: R2 doesn't like low voltage
Date: 26 Jun 1995 21:25:43 GMT
Organization: Sun Microcomputer Corporation
Lines: 28
Message-ID: <3sn8kn$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sunspot.west.sun.com

In article [e-mail], [e-mail] (John Seboldt) writes:
>A problem with the Rick Campbell R2 receiver design (Jan. 1993 QST)
>
>Trying to run a bit of battery-powered Field Day from home, I was
>reminded of a problem I've had with my R2 receiver:  the audio drops out
>very suddenly below about 11.9 volts.  And I mean abruptly right at that
>voltage!  This obviously creates problems for battery operation.
>
>With my scope, I traced the problem to the LM387 audio preamp stage.  The
>stages before this were still working below 11.9 volts.
>
>Anything one can do to re-bias that stage or something? Or do I have a
>marginal chip?

I had exactly the same problem about a million years ago (well, in 1979
or maybe 1980).  The chip simply wouldn't realibly work off the
automotive power supply but was fine at 15V.  I don't recall anything
could be done to change it; the issue is with internal bias sources.

You could use a voltage inverter (like the 7660) to pump up a negative
supply, maybe....

---
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *




From [e-mail] Tue Jun 27 16:23:17 1995
Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!fido.asd.sgi.com!diver.asd.sgi.com!leej
From: [e-mail] (Lee Jones)
Newsgroups: rec.ponds,rec.puzzles,rec.pyrotechnics,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.railroad,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skate,rec.skiing.alpine,rec.skiing.snowboard,rec.skydiving,rec.sport.baseball,rec.sport.baseball.fantasy,rec.radio.amateur.antenna
Subject: Responding to Spams
Date: 27 Jun 1995 18:07:42 GMT
Organization: Silicon Graphics, Incorporated
Lines: 21
Message-ID: <3sphde$[e-mail]>
References: <3sobjd$[e-mail]> <[e-mail]>
NNTP-Posting-Host: diver.asd.sgi.com
Xref: grape.epix.net rec.ponds:574 rec.puzzles:44723 rec.pyrotechnics:30419 rec.radio.amateur.digital.misc:9138 rec.radio.amateur.equipment:13692 rec.radio.amateur.homebrew:7981 rec.radio.amateur.misc:81783 rec.radio.amateur.policy:28318 rec.radio.cb:20982 rec.radio.scanner:27346 rec.radio.shortwave:54297 rec.radio.swap:38156 rec.railroad:74621 rec.roller-coaster:17116 rec.running:32669 rec.scouting:28401 rec.scuba:59211 rec.skate:38540 rec.skiing.alpine:20735 rec.skiing.snowboard:10813 rec.skydiving:28907 rec.sport.baseball:200964 rec.sport.baseball.fantasy:21199 rec.radio.amateur.antenna:11486

In article <[e-mail]>,
Tse-Sung Wu  <[e-mail]> wrote:
>Spam somewhere else, dude.

Folks - re-posting to a spam does nothing but lengthen its life.  You
want to do something about the spammers (and I'm all for that), contact
[e-mail].   The big online services (aol, prodigy) seem to
produce the most spams (probably because they have the most users, and
many of those are fairly clueless :-).  The good side of that is that
those big online services also respond very quickly to spamming problems
originating inside their walls.

The current one we're dealing with did *not* originate there - it came
from a site called "ixc.net", which means nothing to me, but I'm going to
send an e-mail to the [e-mail], just in case.

Regards, Lee
--
Lee Jones     | "Jesus just left Chicago, and he's bound for New Orleans."
[e-mail]  |            -Z.Z. Top
415-390-3356  |


From [e-mail] Tue Jun 27 16:23:17 1995
Path: grape.epix.net!news.sprintlink.net!hookup!news.kei.com!nntp.et.byu.edu!news.mtholyoke.edu!news.umass.edu!nic.umass.edu!deimos.oit.umass.edu!LEMPICKI
From: [e-mail] (Robyn Lyn Lempicki)
Newsgroups: rec.radio.amateur.homebrew
Subject: Site for QRP stuff???
Date: 25 Jun 1995 11:16:25 GMT
Organization: University of Massachusetts, Amherst
Lines: 4
Message-ID: <3sjgi9$[e-mail]>
NNTP-Posting-Host: deimos.oit.umass.edu
X-Newsreader: TIN [version 1.2 PL2v [VAX/VMS]]


Hi!  I am interested in finding plans & discussions on QRP rigs.  Does anyone
know if a site exists on this subject?   --Gerry



From [e-mail] Tue Jun 27 16:23:18 1995
Path: grape.epix.net!news.sprintlink.net!news.clark.net!starport!brian.carling
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
Subject: Site for QRP stuff???
From: [e-mail] (Brian Carling)
Message-ID: <[e-mail]>
References: <3sjgi9$[e-mail]>
Date: Sun, 25 Jun 1995 12:51:00 -0500
Organization: =ACE= ONLINE [phone]
Lines: 11

Newsgroups: rec.radio.amateur.homebrew

RLL>Hi!  I am interested in finding plans & discussions on QRP rigs.  Does anyo
RLL>know if a site exists on this subject?   --Gerry

Hi Gerry - do a SUBSCRIBE message to
[e-mail]

you will love it!
---
 ■ SLMR 2.1a ■ Sticker seen on the Enterprise computer:  Motorola Inside


From [e-mail] Tue Jun 27 16:23:18 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news2.near.net!news.umass.edu!nic.umass.edu!phobos.oit.umass.edu!LEMPICKI
From: [e-mail] (Robyn Lyn Lempicki)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Site for QRP stuff???
Date: 26 Jun 1995 23:03:29 GMT
Organization: University of Massachusetts, Amherst
Lines: 3
Message-ID: <3snec1$[e-mail]>
References: <3sjgi9$[e-mail]>
NNTP-Posting-Host: phobos.oit.umass.edu
X-Newsreader: TIN [version 1.2 PL2v [VAX/VMS]]

Hi!  Thanks to all of you that responded!  I will be joining the list...
--Gerry  KA1STZ



From [e-mail] Tue Jun 27 16:23:19 1995
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!intac!sailboar!jeff.sumberg
From: [e-mail] (JEFF SUMBERG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Source for printed circuit boards
Message-ID: <[e-mail]>
Date: Mon, 26 Jun 95 09:48:00 -0400
Distribution: world
Organization: The SailBoard BBS * Ringwood, NJ, USA * [phone]
Reply-To: [e-mail] (JEFF SUMBERG)
X-Newsreader: PCBoard Version 15.21
X-Mailer: PCBoard/UUOUT Version 1.10
Lines: 14

Anyone know of companies that will produce printed circuit boards of
low quantity at LOW prices?

I've got a project that I would need about 2 to 5 boards for, but I
don't want to spend "prototype" prices for.

Etching myself is out, the board is double sided and is a bit too
complex.

--
73 de N2VYU
Jeff

 * 1st 2.00d #32s * .


From [e-mail] Tue Jun 27 16:23:20 1995
Path: grape.epix.net!news.sprintlink.net!gatech!newsfeed.pitt.edu!godot.cc.duq.edu!news.duke.edu!zombie.ncsc.mil!simtel!noc.netcom.net!ix.netcom.com!netnews
From: [e-mail] (Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: re: WTD: 2 M  Walking Stick Beam
Date: 26 Jun 1995 14:04:29 GMT
Organization: Netcom
Lines: 36
Distribution: world
Message-ID: <3smepd$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-hou6-01.ix.netcom.com

In <[e-mail]> [e-mail] (Michael
Black) writes:

>
>[e-mail] (Byron) is looking for plans for
>a 2m and 70cm beam that can be taken apart and the elements
>put in a the PVC boom for storage.

I built one, not that fit in the boom, but fit in a 2 foot long 2"
diameter tube, that worked on 2m, 220, and 440.

Started with a heavy telescoping CB antenna, used the thick end and
extended it out and cut off the small end to the length of the 2m beam.
 I took 3 pair of TV rabbit ears, built clamp-on rings to clamp to the
CB antenna, and cut the rabbit ears so extended were the correct length
for 2m.  The rabbit ears had a flat mounting tang, so I was able to fold
them back for storage.  The clamp on rings were the only things that had
to be fabricated, I cut 3/8" wide strips of 1/8" aluminum and bent them
the right diameter for each half of the 3 clamps for the TV rabbit ears,
then attached them with screws to hold the rabbit ears, but swival to
store.

Anyway you should get the idea, then I found with a tape measure I was
able to position the elements and lengths for 220 or 440, not as simple
as just pulling out to full length, but it did work.

Just wander around in hardware stores, surplus stores and let you
imagination take over.

I also have a 2m dual element quad that stores in a 4' 2" tube, be
creative, that's the fun part.

Then there is my portable 80m 6 foot diameter capacity hat that fits in
a Large coffe can, complete with loading coil.

KI5GY  Glenn Sparks


From [e-mail] Tue Jun 27 16:23:21 1995
Path: grape.epix.net!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: re: WTD: 2 M  Walking Stick Beam
Date: 27 Jun 1995 02:01:09 GMT
Organization: News & Observer Public Access
Lines: 16
Message-ID: <3snop5$[e-mail]>
References: <[e-mail]> <3smepd$[e-mail]>
NNTP-Posting-Host: vyger207.nando.net

[e-mail] (Glenn Sparks) wrote:
>
SNIP...
> Anyway you should get the idea, then I found with a tape measure I was
> able to position the elements and lengths for 220 or 440, not as simple
> as just pulling out to full length, but it did work.
>
SNIP...

Just a hint - calibrate the storage tube with marks for the settings
for the element lengths - it is much quicker than using a tape measure
and not as likely to get lost.

73,
Don W3FPR



From [e-mail] Fri Jun 30 19:32:33 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!hobbes.physics.uiowa.edu!news.uiowa.edu!news1.icaen!drenze
From: [e-mail] (Douglas J Renze)
Newsgroups: rec.radio.amateur.homebrew
Subject: "Touch-driven" Iambic paddles?
Date: 29 Jun 1995 19:50:52 GMT
Organization: Iowa Computer Aided Engineering Network, University of Iowa
Lines: 17
Message-ID: <3sv06s$[e-mail]>
NNTP-Posting-Host: grind.isca.uiowa.edu

Several years ago (well, sometime since January of 1981) QST published an
article detailing how to build a "touch-driven" Iambic paddle.  I *believe*
that it worked by sensing the change in potential on two plates due to hand
capacitance (with an adjustable threshold, as I recall).  Well, I've since
lost the article, but I'd love to build such a beast--I think it would be
fun to use, especially with my CMOS Super Keyer II. ;-)  Could somebody
please point me to such an article, or to schematics on how to build such
a thing?  I'd be much obliged.  Please reply via e-mail, so as to save band-
width.  If there's interest, I'll summarize and post for the group.

Tnx es 73 de N0YVW SK

--
         Doug Renze, N0YVW * [e-mail] * N0YVW @ W0IUQ.ia.usa.na
                                [e-mail]

                           Hitchhiking the Infobahn.


From [e-mail] Fri Jun 30 19:32:34 1995
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2m? 70cm? How hard?
Date: 28 Jun 1995 18:56:02 GMT
Organization: Los Alamos National Laboratory
Lines: 26
Message-ID: <3ss8k2$[e-mail]>
References: <3sn0ah$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov

[e-mail] (David Covert) wrote:
>
> How hard is it to build VHF/UHF transmitters and recievers? (2m and
> 70cm)
>
> I realize that 'how hard' is a realitive thing, so how does it compare to
> building HF QRP stuff or microprocessor/microcontroller projects?
>
> DAVID COVERT, KB5GOG     [e-mail]
>                     -or- [e-mail]
>                     -or- [e-mail]
>                     Take your pick...
>




Not too difficult, depending on your expertise and test
equipment availability.   Especially the UHV/VHF stuff marketed
by Ramsey and Hamtronics is relatively easy to build compared
to HF stuff, you just have to be a bit more careful with coil/
loop dimensions etc at upper frequencies.
I've built several HF and VHF linear amplifiers and at least in
my limited experience VHF/UHF is easier to build and less
difficult to troubleshoot.
Jim WB5AOX


From [e-mail] Fri Jun 30 19:32:35 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!uwm.edu!lll-winken.llnl.gov!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!mgate.arrl.org!not-for-mail
From: [e-mail] (Zack Lau)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2m? 70cm? How hard?
Date: 29 Jun 1995 10:20:06 -0400
Organization: American Radio Relay League
Lines: 25
Message-ID: <3sucqm$[e-mail]>
References: <3sn0ah$[e-mail]> <3ss8k2$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
X-Newsreader: TIN [version 1.2 PL2]

KB5GOG: [e-mail] (David Covert) wrote:
: >
: > How hard is it to build VHF/UHF transmitters and recievers? (2m and
: > 70cm)
: >
: > I realize that 'how hard' is a realitive thing, so how does it compare to
: > building HF QRP stuff or microprocessor/microcontroller projects?

In the USA, due to the FCC rules, the hardest stuff to build is
VHF gear.  Getting spurs down 60 dB is much tougher than getting
them down 40 dB.  Often, you need to add real shielding between
stages.  On the other hand, you probably want to do that anyway
to keep pagers, cellular phones, TV, and FM broadcast stations
out of your circuitry.

On the other hand, depending on the technology you have available,
70 cm stuff can be even easier to build than HF gear.  At 222 MHz
and above, no-tune etched filters are certainly practical for
those with expensive computer software.  A set of boards for
432 through 5760 MHz is sold by Down East Microwave.

--
Zack Lau  KH6CP/1           2 way QRP WAS
                           8 States on 10 GHz
Internet: [e-mail]   10 grids on 2304 MHz


From [e-mail] Fri Jun 30 19:32:37 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: 6C33C Tube Transmitter (Was: High Efficiency MOSFET HF Transmitter
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <1995Jun14.125209.10242@eisner> <3ro0vn$[e-mail]> <[e-mail]> <1995Jun19.133533.10307@eisner> <3siatu$[e-mail]>
Date: Wed, 28 Jun 1995 13:20:20 GMT
Lines: 44

In article <3siatu$[e-mail]> Jim Potter <[e-mail]> writes:
>[e-mail] (Steve Cloutier - Notes 'R Us) wrote:
>>
>>I don't understand why I would be exceeding the dissipation of the
>>tube, but maybe I'm missing something (probably)!
>>
>>The rating sheet I got (a poor one at that) shows the tube good for
>>60 watts (both units together) and a max plate current of 600MA.  Nothing
>
>There is a complication in calculating the power when the output is sinusoidal.
>The anode voltage is varying from saturation to some higher value during the time
>the grid is pulsed to Vgmax. The wider the pulse with respect to the rf period
>the more dissipation.  Of course the power output goes up also.  There is some
>maximum efficiency, just like normal class C operation.  This will occur
>somewhere between 90 and 180 degress of on-time.  (For normal class C maximum
>efficiency occurs at around 140 deg. conduction angle.)  You can calculate the grid
>and anode dissipation by looking at the constant current curves for the tube.  Both
>the anode and grid current vary along a line of constant grid voltage during the
>fraction of the cycle that the tube is on.  From the tube power input you can
>calculate the power output and the power dissipation.  Essentially all power
>produced at harmonic frequencies is dissipated in the tube.  My conclusion from the
>40 kW amplifier (which I recently beefed up to 60 kW) is that the efficiency is
>somewhat less than with sinusoidal drive, but the simplicity of not having a
>grid/cathode tuned circuit was worth it.

Lets see, now I believe we're talking about a Class D design here. The
tube is turned on hard during a very small part of the cycle, well under
90 degrees, and anode voltage will be clamped to Vsat during that time.
During the rest of the cycle, while the tube isn't conducting, the anode
voltage will follow the tank, and depending on loaded Q, can become rather
high, normally a peak to peak voltage 2x or more of DC plate voltage. We
can ignore that as long as the tube doesn't flash over. The thing we're
interested in is the current pulses we get from the tube during the time
it is saturated. The Rs of the tube will be Vsat/Ip while the power
delivered to the load will be tank Vt/Ip. So plate dissipation will
be proportional to Po*Vsat/Vt.

Gary

--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Jun 30 19:32:38 1995
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!utnut!nott!cunews!hydra.carleton.ca!im
From: [e-mail] (Ian McEachern VE3PFH)
Subject: Re: BNC/N adapter please!
X-Nntp-Posting-Host: hydra.carleton.ca
Message-ID: <[e-mail]>
Followup-To: rec.radio.swap,rec.radio.amateur.homebrew
Sender: [e-mail] (News Administrator)
Organization: Carleton University
X-Newsreader: TIN [version 1.2 PL2]
References: <3sg95c$[e-mail]>
Date: Wed, 28 Jun 1995 20:19:58 GMT
Lines: 28
Xref: grape.epix.net rec.radio.swap:38239 rec.radio.amateur.homebrew:8010

Brian Mork ([e-mail]) wrote:
: I need two N female/BNC male adapters.  Could anybody offer me a sale at
: a good price?

: This would be the slotted BNC half (not the side with the
: ears), and the N connector with threads exposed rather than inside.

Interesting tidbit - did you know that an N male will mate with
a BNC female? Yup it does ... give it a try (make sure both
are same impedances tho).

If it's just for temp work or testing ... you don't need the
above adapter.

Ian


: --
: Brian J. Mork, InCrea (TM) - Pacific Northwest, Voice 509-244-3764
:  [e-mail] / ARO ka9snf@ka7fvv.#ewa.wa.usa
:   USMail 6006-B Eaker, Fairchild, WA 99011

--
Ian A. McEachern, VE3PFH             | Try our new www server:
Packet Working Group, Ottawa A.R.C.  | http://hydra.carleton.ca/
[e-mail]                 | Interesting stuff about packet
http://hydra.carleton.ca/~im/im.html | radio & our 56kbps radio LAN



From [e-mail] Fri Jun 30 19:32:38 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!hobbes.physics.uiowa.edu!news.uiowa.edu!news1.icaen!drenze
From: [e-mail] (Douglas J Renze)
Newsgroups: rec.radio.amateur.homebrew
Subject: Building Zack Lau's QRP 3-bander for 40/80m?
Date: 29 Jun 1995 22:32:56 GMT
Organization: Iowa Computer Aided Engineering Network, University of Iowa
Lines: 16
Distribution: world
Message-ID: <3sv9mo$[e-mail]>
NNTP-Posting-Host: grind.isca.uiowa.edu

Hiya, folks.  I'm looking to build a QRP tranceiver for use on 40/80m
CW (novice/tech bands).  I've selected the KH6CP tribander described in
the ARRL handbook because it's a self-sufficient tranceiver (I live in
an apartment--this is a consideration) and because the notes mention that
it's relatively easy to modify this tranceiver for other bands.  Has anybody
done this--preferrably for 40 and 80m?  If so, would you be interested in
sharing tips/instructions/TELLING ME HOW TO MAKE THE MODS (hint-hint ;-) )
to build this?

Tnx es 73 de N0YVW SK

--
         Doug Renze, N0YVW * [e-mail] * N0YVW @ W0IUQ.ia.usa.na
                                [e-mail]

                           Hitchhiking the Infobahn.


From [e-mail] Fri Jun 30 19:32:40 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news2.near.net!news.delphi.com!usenet
From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS & PLL Hybrid Theory
Date: 29 Jun 1995 06:53:12 GMT
Organization: Delphi Internet Services Corporation
Lines: 49
Message-ID: <3stiko$[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
NNTP-Posting-Host: bix.com
X-Newsreader: NetBix 0.48
X-Newsreader-Author: [e-mail] (Loren Wilton)
    This message has been posted with development version software.
    If there are any problems with the message format, send me mail.

In article <[e-mail]>, [e-mail] (Chris Stratton) wrote:
>In article <[e-mail]> [e-mail] writes:
>
>>Chris:
>>        Here is the short answer to your question: In order for the DDS part to
>>work correctly you MUST convert the DAC output to a sine wave!
>
>>        You have missed a subtle part of how the DDS part of the combo works.
>>The PLL uses the zero crossings of the phase reference to do the phase
>>comparison.
>
>The DAC output cannot cross its midpoint (zero of the AC output) without
>the MSB of the 8 bit word fed to the DAC changing.  Thus looking at the MSB of
>the sine output (which IS the same as the MSB of the phase register (but 180
>degrees delayed)) will give a square wave with the same frequency and zero
>crossings as the sign wave - but it will be loaded with harmonics
>
>>If you do an
>>analysis of the codes that come out for low fractions of the clock frequency
>>(say 1/3) you will see that the DAC output changes from positive to negative
>by >some pretty weird values and these zero crossings do not necessarily
>correspond >to the zero crossings of the desired phase signal.
>
>True - the zero crossings aren't right - but they average out over time to
>being right.  Some sort of LPF is used on the DDS sinewave to
>smooth it out, and this has the effect of moving the zero crossings closer to
>the right place.  But they won't always be right - so what effect does this
>have on the ultimate PLL output spectrum?  And what would be the effect of
>greater average deviation in zero-crossing timing, ie, a 1 bit DDS output?

You are both "almost" correct here. A simple PLL can only filter out the higher
frequency components of the MSB noise. If you have a relatively narrow band
tracking filter on the signal going into the PLL, however, you can get rid of
SOME of the phase jitter via the zero crossing detector route. The zero crossing
detector provides an "average" function for the step just before the MSB changes
and the step just after. This "average point" will sit much much closer to the
right time regardless of MSB jitter as you increase filtering and increase the
bits of precision in your DAC. Of course it seems it might be possible to
seperately convert the lesser SBs as a "bias term" on the PLL output to correct
for the jitters. Someone wanna analyze that one? (Hint - it's been done before.)

>
>Chris, N1IIR
>[e-mail]
>
>
{^_^}     Joanne Dow, Amiga Exchange Editor on BIX
          [e-mail]   The Wizardess



From [e-mail] Fri Jun 30 19:32:41 1995
Path: grape.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!newsroom.utas.edu.au!news
From: [e-mail] (Ian Mitchell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS & PLL Hybrid Theory
Date: 29 Jun 1995 08:14:00 GMT
Organization: University of Tasmania
Lines: 30
Message-ID: <3stnc8$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pc122.research.utas.edu.au
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2

In article <[e-mail]>, [e-mail] says...
>
>In article <[e-mail]> [e-mail] writes:
>
>>Chris:
>>        Here is the short answer to your question: In order for the DDS part to
>>work correctly you MUST convert the DAC output to a sine wave!
>
>>        You have missed a subtle part of how the DDS part of the combo works.
>>The PLL uses the zero crossings of the phase reference to do the phase
>>comparison.
>
>
Hello Chris and Ray,

I am currently working on a DDS would like to be able to connect the
high order bit to the mixer through an LPF. I built a spread sheet based
on the output from the high order bit and looked at the fourier
spectrum generated. It looked ok in that there was no even harmonics and
the odd harmonics were way down.

I'm using an IF of 10.7MHz with down conversion, ie dds operates above 10.7MHz

If I arrange for the front end to reduce images, is this a viable idea, or am I
missing something here?

Best Regards,

Ian



From [e-mail] Fri Jun 30 19:32:43 1995
Path: grape.epix.net!news.sprintlink.net!news.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS & PLL Hybrid Theory
Date: 28 Jun 1995 19:03:44 GMT
Organization: Primenet [phone]
Lines: 74
Message-ID: <3ss92g$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: usr3.primenet.com
X-Newsreader: TIN [version 1.2 PL2]

Chris Stratton ([e-mail]) wrote:
: Direct Digital Synthesis is too noisy, and Phase Locked Loop
: synthesizers don't have a small enough step size for HF use.
: So it seems like a popular way to do things is touse DDS to
: generate the frequency, but then use a PLL to reproduce a
: spectrally clean version of it.

: May QST had an article about a "DigiVFO", a DDS using 64
: phase accumulator, but only 8 bit output fed to the DAC.
: This was okay, because it drove a Drake rig that used
: a PLL to clean up the VFO input.  The Harris DDS code producer
: chip acutally had 12 output bits, but only 8 were used to keep
: the cost down.

: By why even bother with 8 bits?  The PLL compares the phase of
: the local oscillator and the DDS (the reference).  Why does it's
: phase comparator care if the reference is a nice sine wave?  In fact,
: wouldn't it be happier with just a square wave?  So why not use
: a 1-bit DAC - ie, just feed the phase accumulator MSB into the PLL.

: Re-arranging things conceptually, it seems that this is the
: same as making a tradition PLL synthesizer capable of
: non-integral division factors.  That is, sometimes it divides
: by int(f) and sometimes by int(f)+1 with the fractional part
: being determined by the occurence ratio of the two divisors.

: This seems to be about what a DDS does: the frequency desired
: determines how much to increment the phase accumulator.  At 360
: degrees it rolls over to zero - but it won't actually hit zero
: unless the numbers work out just right.  Instead, the phase
: samples actually used progress slowly each cycle.  What
: we're acutally doing is dividing the DDS clock by a non-integer -
: by selecting an integral multiple of a tiny fraction of that clock.

: I'm not sure if this argument makes any sense, much less if it
: is correct.  I would guess I'm missing something somewhere which
: says that in the DDS/PLL hybrid, the DDS ouput has to at least look
: like a reasonable sine wave, not a bunch of pulses that only average
: out to being on frequency.

: Anyone have any thoughts?  I'm tryin to get my hands on the Harris
: DDS code generator, and will see what happens with the MSB driving
: a PLL - but if someone can tell me directly why this won't work,
: it would save a lot of trouble.

: Chris, N1IIR
: [e-mail]

Chris,
        I only want to respond to one item in your posting, and that is
the mention of using a square wave from the DDS to drove the PLL.
        I got caught by this a year ago, and it's because there is a
phase jitter term that comes into play.  When using the MSB (square
wave) you will experience a 30-degree phase jitter.  If you sum it
with the second MSB, it will become 15 degrees (I think I got that
right (?)).  This is why we use 8 or so of the MSBs and then add a
low-pass filter to supress the clock feedthru.
        Myself, I'm presently constructing a discrete 12-bit DDS for
the 10-Hz resolution fine-tuning in a receiver/transmitter I've been
working on.  I'll be using the 8 MSBs, summing them with an R2R lad-
der, filtering with a LPF, and then through a schmidt trigger to pro-
duce a square wave for a PLL.  The DDS acts as the reference signal.
I don't need to bother with the sine-wave conversion, but if I had to,
I would simply clip with a resistor and a couple of signal diodes be-
fore the LPF for some shaping, which will take carfe of the rest.
This method has its' limitations in terms of tunable bandwidth, but
for my application it's just right.

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


From [e-mail] Fri Jun 30 19:32:44 1995
Path: grape.epix.net!news.sprintlink.net!hookup!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!N1IIR.MIT.EDU!stratton
From: [e-mail] (Chris Stratton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS & PLL Hybrid Theory
Date: Thu, 29 Jun 1995 09:19:17 Eastern
Organization: MIT
Lines: 28
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <3stnc8$[e-mail]>
NNTP-Posting-Host: n1iir.mit.edu
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

In article <3stnc8$[e-mail]> [e-mail] (Ian Mitchell) writes:

>I am currently working on a DDS would like to be able to connect the
>high order bit to the mixer through an LPF. I built a spread sheet based
>on the output from the high order bit and looked at the fourier
>spectrum generated. It looked ok in that there was no even harmonics and
>the odd harmonics were way down.

>I'm using an IF of 10.7MHz with down conversion, ie dds operates above 10.7MHz

>If I arrange for the front end to reduce images, is this a viable idea, or am I
>missing something here?

>Best Regards,

>Ian

Given the recent discussion of MSB phase noise, that sounds a little
too good to be true.  Did you run the fourier analysis over many
periods of the simulated DDS output?  I would think the phase noise
would generate a lot of close-in noise - in effect the 'signal' would
be a narrow band of noise with a peak in the middle.

I'll have to try this experiment myself when I get home from work...

Chris, N1IIR
[e-mail]



From [e-mail] Fri Jun 30 19:32:44 1995
Path: grape.epix.net!news.sprintlink.net!cam.news.pipex.net!pipex!soap.news.pipex.net!pipex!edi.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS & PLL Hybrid Theory
Date: 29 Jun 1995 17:15:55 GMT
Organization: ENST - Telecom Paris
Lines: 8
Message-ID: <3sun4b$[e-mail]>
References: <[e-mail]> <[e-mail]> <3stnc8$[e-mail]> <[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Say, in the middle of your talk, just a question :

Your DDS is fed by an XTAL oscillator.
What is the effect of its phase noise on the phase noise output of the DDS ?
It seems to me that there must be some.
But I may be wrong.

Vince, F5RCS/I2


From [e-mail] Fri Jun 30 19:32:45 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: DDS & PLL Hybrid Theory
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Wed, 28 Jun 1995 12:37:14 GMT
Lines: 37

In article <[e-mail]> [e-mail] (Chris Stratton) writes:
>Direct Digital Synthesis is too noisy, and Phase Locked Loop
>synthesizers don't have a small enough step size for HF use.
>So it seems like a popular way to do things is touse DDS to
>generate the frequency, but then use a PLL to reproduce a
>spectrally clean version of it.
[snip]
>By why even bother with 8 bits?  The PLL compares the phase of
>the local oscillator and the DDS (the reference).  Why does it's
>phase comparator care if the reference is a nice sine wave?  In fact,
>wouldn't it be happier with just a square wave?  So why not use
>a 1-bit DAC - ie, just feed the phase accumulator MSB into the PLL.
[snip]
>I'm not sure if this argument makes any sense, much less if it
>is correct.  I would guess I'm missing something somewhere which
>says that in the DDS/PLL hybrid, the DDS ouput has to at least look
>like a reasonable sine wave, not a bunch of pulses that only average
>out to being on frequency.
>
>Anyone have any thoughts?  I'm tryin to get my hands on the Harris
>DDS code generator, and will see what happens with the MSB driving
>a PLL - but if someone can tell me directly why this won't work,
>it would save a lot of trouble.

It seems to me the problem is that the gross steps are going to
introduce a lot of phase jitter into the PLL, IE mondo phase
noise, that would take an incredibly slow loop filter to handle.
So you'd lose all the advantage of DDS by doing this. The cleaner
the DDS output, the less loop filtering you need, and the faster
response time you get.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Jun 30 19:32:46 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (TANTONR)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Fiinger Stock
Date: 28 Jun 1995 17:01:42 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <3ssfvm$[e-mail]>
References: <3si57e$[e-mail]>
Reply-To: [e-mail] (TANTONR)
NNTP-Posting-Host: newsbf02.mail.aol.com

I believe RF Parts of San Marcos California carries finger stock- their #
is [phone].  You can also try Fair Radio Sales in Lima Ohio.

GL es DXOM!


From [e-mail] Fri Jun 30 19:32:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!dorite!news
From: [e-mail] (~name)
Subject: Re: Fiinger Stock
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
References: <3si57e$[e-mail]>
Date: Thu, 29 Jun 1995 14:58:10 GMT
Lines: 15

<3ssfvm$[e-mail]>
Organization: IQuest Network Services
X-Newsreader: WinVN 0.91.6

In article <3ssfvm$[e-mail]>, [e-mail] (TANTONR)
says:
>
>I believe RF Parts of San Marcos California carries finger stock- their
#
>is [phone].  You can also try Fair Radio Sales in Lima Ohio.
>
>GL es DXOM!

Call MAI/Prime Parts @ 317-257-6811 (Fax [phone]) in Indpls., IN.
Stocking finger stock and associated items for homebrewing.


From [e-mail] Fri Jun 30 19:32:47 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!dorite!news
From: [e-mail] (~name)
Subject: Re: Fiinger Stock
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
References: <3si57e$[e-mail]>
Date: Thu, 29 Jun 1995 15:02:48 GMT
Lines: 12

<3ssfvm$[e-mail]>
Organization: IQuest Network Services
X-Newsreader: WinVN 0.91.6

In article <3ssfvm$[e-mail]>, [e-mail] (TANTONR)
says:
>
>I believe RF Parts of San Marcos California carries finger stock- their
#
>is [phone].  You can also try Fair Radio Sales in Lima Ohio.
>
>GL es DXOM!


From [e-mail] Fri Jun 30 19:32:48 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PAPAWIZARD)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Finals and Drivers
Date: 29 Jun 1995 12:05:08 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <3suivk$[e-mail]>
References: <3rsl5a$[e-mail]>
Reply-To: [e-mail] (PAPAWIZARD)
NNTP-Posting-Host: newsbf02.mail.aol.com

Steven,
What your attempting to do is admirable, however it would involve changing
more than just the driver and final. You would have to increase the
pre-drive stages to be able to supply enough rf to the driver. Also the
power cable, on/off switch,and circuit traces are not designed to handle
the current needed to opperate at 100-watts output. If you must have more
output wattage I suggest you purchase an external amp or an RCI-2970
10-meter radio.

PAPAWIZARD


From [e-mail] Fri Jun 30 19:32:49 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.shortwave,rec.radio.swap
Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!fnnews.fnal.gov!gw1.att.com!nntpa!bigtop!news
From: YourName <[e-mail]>
Subject: FS: Microwave Equipment
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
Sender: [e-mail] (Netnews Administration Login)
Nntp-Posting-Host: drpccft1
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Date: Fri, 30 Jun 1995 16:51:00 GMT
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Xref: grape.epix.net rec.radio.amateur.equipment:13818 rec.radio.amateur.homebrew:8064 rec.radio.amateur.misc:82012 rec.radio.shortwave:54520 rec.radio.swap:38399

YourName <[e-mail]> wrote:
>Communication System: Microwave, military, 3 complete units
0A-8044A/TRC-97A by Radiation Systems, Inc
Antenna Group ANTRC-97A,0A 7161A/TRC97 by RCA
all records - equipment is in working order

Govt cost $248,000.00 ea.

All 3 units for about $4500.  we load - you haul

Cedardege, Colorado

970-856-7303  -Larry

------------------------------------

This is posted for a friend - please call the number above for more info.
Thank you





From [e-mail] Fri Jun 30 19:32:49 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!europa.chnt.gtegsc.com!library.ucla.edu!info.ucla.edu!csulb.edu!ddillon
From: [e-mail] (Daniel Dillon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Glass solar panel
Date: 28 Jun 1995 03:22:12 GMT
Organization: Cal State Long Beach
Lines: 26
Message-ID: <3sqht4$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: heart.engr.csulb.edu
X-Newsreader: TIN [version 1.2 PL2]

Pat Moore ([e-mail]) wrote:
: I picked up a glass solar panel at Dayton and they gave me some little
: brass clips to attach to the sides of the panel as contacts.  They keep
: slipping off.  Does anyone know how to attach secure contacts to the
: panel to get the juice out of it?  I'm trying to get it hooked up to
: recharge a gel-cell this weekend so our club can get those extra points.

: Pat Moore, AL7L
: [e-mail]
: 502-793-0470
Go to your local hobby shop, get some brass tubing.
Cut off about an inch, and then cut a slit lengthwise in the brass.  Now,
solder a piece of wire to the brass.  Now, expand and force the brass
onto the solar panel.  I did this, and it makes a good, damn tight fit.
Holds up well in inclinent weather also!

Dan


--
___________________________________________________________________________
Finger or e-mail for PGPv2.6 key.      |       Are these views really mine?
Internet:[e-mail]        | PGPprint = 02 A6 07 34 22 80 53 09
WWIVnet: #612 @ 1187                   |            8C 1E 5E 15 1A B4 43 1F
Packet: kd6fpx@k6ve.#soca.ca.usa.noam  |Infinet: #224 @ 1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


From [e-mail] Fri Jun 30 19:32:50 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Mikelder)
Newsgroups: rec.radio.amateur.homebrew
Subject: gps receivers
Date: 28 Jun 1995 22:43:29 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <3st40h$[e-mail]>
Reply-To: [e-mail] (Mikelder)
NNTP-Posting-Host: newsbf02.mail.aol.com

A friend of mine was telling me that there was a gps radio out there
somewhere, that only had an rs232 interface. No readout or controls, just
rs-232 out. He said that it was very cheap. less than $150. If anyone
knows of anything like that please let me know. Also I would like a good
book on gps.


From [e-mail] Fri Jun 30 19:32:50 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PAPAWIZARD)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help:  Reattaching plates on variable capacitor shaft
Date: 29 Jun 1995 12:05:07 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <3suivj$[e-mail]>
References: <3sfubi$[e-mail]>
Reply-To: [e-mail] (PAPAWIZARD)
NNTP-Posting-Host: newsbf02.mail.aol.com

Dave ,
I suggest replacing the whole cap.
I have several of these available and the price is a lot less than the
trouble of attempting to fix the old one.
PAPAWIZARD


From [e-mail] Fri Jun 30 19:32:51 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!torn!news.unb.ca!coranto.ucs.mun.ca!leif!fhartery
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: HIGH POWER RF SWITCH ?
Date: 27 Jun 95 20:21:22 -0230
Organization: Memorial University. St.John's Nfld, Canada
Lines: 11
Message-ID: <1995Jun27.202122.1@leif>
NNTP-Posting-Host: leif.ucs.mun.ca



Hi,
        This posting may seem a bit odd for this group, but I am looking
for a source for a high power solid state switch capable of 5 KW PEP
while operating in the RF band. If I seem a bit crazy here, it comes
with the territory ! Many thanks in advance.

Fabian Hartery
C-CORE
St.John's, Newfoundland, Canada


From [e-mail] Fri Jun 30 19:32:52 1995
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!library.ucla.edu!info.ucla.edu!csulb.edu!ddillon
From: [e-mail] (Daniel Dillon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: how to isolate HT from auto power spikes?
Date: 28 Jun 1995 03:24:40 GMT
Organization: Cal State Long Beach
Lines: 27
Message-ID: <3sqi1o$[e-mail]>
References: <3sf230$[e-mail]>
NNTP-Posting-Host: heart.engr.csulb.edu
X-Newsreader: TIN [version 1.2 PL2]

Peter Reiner ([e-mail]) wrote:

: I'm powering my HT from the cigarette lighter, and although there are no
: problems with noise, I'm afraid of volage spikes from the
: alternator or starter blowing out the radio.
: Would it suffice to put a 35 volt Metal Oxide Varistor in paralell
: with the radio, or do I need a sink resistor somewhere also?
: There *is* a fuse on the lighter plug.
: Thanks for any advice.


This would be a good idea.  In addition, you could put a coil in seeries,
and a large cap in paralell with the power leads.  I ran with an HT in
th4e car for a few years, and ran a couple of large electrolytic caps in
paralell with the power leads.  (I had a dedicated power line from the
battery, with the caps near the radio.)  I never had any problem.

Dan


--
___________________________________________________________________________
Finger or e-mail for PGPv2.6 key.      |       Are these views really mine?
Internet:[e-mail]        | PGPprint = 02 A6 07 34 22 80 53 09
WWIVnet: #612 @ 1187                   |            8C 1E 5E 15 1A B4 43 1F
Packet: kd6fpx@k6ve.#soca.ca.usa.noam  |Infinet: #224 @ 1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


From [e-mail] Fri Jun 30 19:32:53 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!news.cerf.net!nntp2.cerf.net!pelican.com!grian!morris
From: [e-mail] (Mike Morris)
Subject: Re: how to isolate HT from auto power spikes?
Message-ID: <[e-mail]>
Organization: College Park Software, Altadena, CA
References: <3sf230$[e-mail]> <3sqi1o$[e-mail]>
Date: Thu, 29 Jun 1995 07:37:34 GMT
Lines: 35

[e-mail] (Daniel Dillon) writes:

>Peter Reiner ([e-mail]) wrote:

>: I'm powering my HT from the cigarette lighter, and although there are no
>: problems with noise, I'm afraid of volage spikes from the
>: alternator or starter blowing out the radio.
>: Would it suffice to put a 35 volt Metal Oxide Varistor in paralell
>: with the radio, or do I need a sink resistor somewhere also?
>: There *is* a fuse on the lighter plug.
>: Thanks for any advice.

>This would be a good idea.  In addition, you could put a coil in seeries,
>and a large cap in paralell with the power leads.  I ran with an HT in
>th4e car for a few years, and ran a couple of large electrolytic caps in
>paralell with the power leads.  (I had a dedicated power line from the
>battery, with the caps near the radio.)  I never had any problem.

A friend of mine did the same thing, but used a 110v-24v transformer
as the choke - ran the +12 thru the secondary winding, then to the
+ end of the cap (2000 uf, 35v) then to the radio.  It worked real well.
He used a fuse rated at one amp more than the radio manual specified,
and a LM 317 set as a 13v regulator, and a 15v 10w zener as a
just-in-case, lets-blow-the-fuse-NOW device.

It worked even better when he shorted the primary winding of the
transformer....



--
Mike Morris   WA6ILQ          | All opinions must be my own since nobody
PO Box 1130                   | pays me enough to be their mouthpiece...
Arcadia, CA. 91077            |
ICBM: 34.07.930N, 118.03.799W | Reply to: [e-mail]


From [e-mail] Fri Jun 30 19:32:54 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!dog.ee.lbl.gov!newshub.nosc.mil!rcp6.elan.af.mil!usenet
From: Chris Spacone <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: how to isolate HT from auto power spikes?
Date: 29 Jun 1995 17:13:20 GMT
Organization: Air Force Flight Test Center
Lines: 5
Message-ID: <3sumvg$[e-mail]>
References: <3sf230$[e-mail]>
NNTP-Posting-Host: 129.198.18.254
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

You could try using one of the many linear voltage regulator chips
available in the market.

73, Chris



From [e-mail] Fri Jun 30 19:32:55 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: how to isolate HT from auto power spikes?
Date: 30 Jun 1995 00:25:59 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 35
Message-ID: <3svgan$[e-mail]>
References: <3sf230$[e-mail]> <3sumvg$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <3sumvg$[e-mail]>,
Chris Spacone  <[e-mail]> wrote:
>You could try using one of the many linear voltage regulator chips
>available in the market.

Keep in mind most of the common three pin linear regulators have
about a 2 volt input-output differential; for the device to stay
in regulation, the input must be about 2V greater than the desired
output.  For example, a 7812 really needs about 14V in to give a
regulated 12V output.  If the input drops, so will the output.
The voltage drop also increases as the load increases; an HT
that works OK receiving may not transmit correctly.

Also, most of the common regulators aren't specified to the
kind of transient voltages that occur in the automotive electrical
system.  In fact, for large input spikes or negative input
spikes the regulator may fail, often as a short circuit (I've
tried this at home).

There are regulators designed for the automotive environment;
the LM2941 is a nice 5V part from NatSemi which is specified
for negative and large positive input transients.  Also, the
input-output differential is very low, something like 600mV
with a 1A load.  The downside is the +5V fixed output.... but
there may be similar devices at higher or adjustable voltages
available now.

I'd probably use an LC filter followed by a fuse and a healthy
Zener on the order of 19V/5W, like a 1N5356A, to protect the
power supply if I was worried.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Fri Jun 30 19:32:55 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!netnet2.netnet.net!en.com!news.erinet.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!mgate.arrl.org!not-for-mail
From: [e-mail] (Zack Lau)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: how to isolate HT from auto power spikes?
Date: 30 Jun 1995 09:44:22 -0400
Organization: American Radio Relay League
Lines: 27
Message-ID: <3t0v3m$[e-mail]>
References: <3sf230$[e-mail]> <3sumvg$[e-mail]> <3svgan$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
X-Newsreader: TIN [version 1.2 PL2]

Dana Myers ([e-mail]) wrote:

: There are regulators designed for the automotive environment;
: the LM2941 is a nice 5V part from NatSemi which is specified
: for negative and large positive input transients.  Also, the
: input-output differential is very low, something like 600mV
: with a 1A load.  The downside is the +5V fixed output.... but
: there may be similar devices at higher or adjustable voltages
: available now.

QST published an article on using the LM2941T adjustable
regulator in November 1989.  It even has information
about the auto electrical enviroment.

They have one well known problem--you need a good electrolytic
or tantalum capacitor of sufficiently large capacitance and low
series resistance on the output of the device to keep it
from oscillating.  The more current you draw, the smaller
the capacitor you need.  A 22 uF tantalum works well in many
cases, though I'd recommend you look up the data book notes
or copy a circuit that works.


--
Zack Lau  KH6CP/1           2 way QRP WAS
                           8 States on 10 GHz
Internet: [e-mail]   10 grids on 2304 MHz


From [e-mail] Fri Jun 30 19:32:57 1995
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From: [e-mail] (Stephen William Simpson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ignorant question about envelope detectors
Date: 30 Jun 95 15:05:09 +1200
Organization: University of Canterbury, Christchurch, New Zealand
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Hola Everyone,

        I'm fairly ignorant of electronics, but I have a question which you may
be able to answer.

        It seems to me that a standard envelope detector as used in the
detection of an AM signal would perform better if the standard fixed value
capacitor was replaced by a circuit which had a capacitance which varied with
changes in frequency.

        If a large valued capacitor is used in an ordinary envelope detector
lower frequency 'message' signals would be detected well as the discharge from
the capacitor would be roughly linear over the short period of time to the next
signal.

        However, at higher 'message' signal frequencies the 'slope' of the
discharge from the capacitor would not be steep enough to ensure that the
voltage across the capacitor at the arrival of the next carrier peak the was
below that carrier peak.

        Me thinks that most envelope detectors compromise by having a smaller
valued capacitor, which unfortunately are not so good for the lower freqency
'message' signals.

        I of course claim ignorance, so if I'm completely and utterly wrong
then feel free to correct my ignorance.

        So if I am right, do there exist any circuits out there, which use off
the shelf components, which may be used as a sought of frequency dependant
capacitor.

        Also a friend of mine had an idea about using a 'dual detector' in an
AM receiver, the idea is to use a bridge rectifier of Germainium diodes instead
of the standard single diode.  Me thinks it should improve the quality of
detection.  Any thoughts or comments on this much appreciated.

Regards,

Stephen Simpson




From [e-mail] Fri Jun 30 19:32:57 1995
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From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: JVFAX&AA Multifax board
Date: 29 Jun 1995 12:36:27 GMT
Organization: IT
Lines: 15
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Has anyone tried to interface the AA NOAA WEFAX board to JVFAX 7.0?
The "simple" opamp comparator circuit works very well for HF fax.
The 2206 based VCO that takes the NOAA siganl and then sends it to
opamp comparator works.   Just not to well.  I have the old multifax
system and was wondering if anybody had had any success interfacing
it to JVFAX 7.0.  The old multifax system worked ok but the resolution
was never what I had wanted.  The AA board has an 8bit adc with all 8
bits brought out the ouput connector.  Parallel ports are rather tricky
to feed.  I am thinking that I will need to change the noninverting
output buffer to an inverting buffer.  Any thoughts?
The JVFAX program is wonderfull.  Anyone who has ever had any interest
in fax hf or NOAA LEO weather sats ought to check it out.

Terry Fugate
WN4ISX


From [e-mail] Fri Jun 30 19:32:58 1995
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From: [e-mail] (randson)
Newsgroups: rec.radio.amateur.homebrew
Subject: looking for 12:1 of baluns
Date: 28 Jun 1995 07:02:37 GMT
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Hello, anybody home?

   Who know where can get find a 12:1 of balun, what factory or comapny
   sale this one, or who want to sale, active is ok,
   I want to using on inverted V diploe!


                                            de Radnson Huang/ BV2DQ
                                               in Taipei, Taiwan
                                         [e-mail]



From [e-mail] Fri Jun 30 19:32:58 1995
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From: [e-mail] (Steve Bertsch)
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew
Subject: looking for crystal
Date: 30 Jun 1995 21:40:59 GMT
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Xref: grape.epix.net rec.radio.swap:38404 rec.radio.amateur.homebrew:8066


I'm looking for a crystal in the range of 8.08333.. to 8.1 MHz, preferably in
a FT-243 holder, but other styles will do. This is to put my Heath lunchbox
in the 145.50 -> 145.80 (misc. & experimental) part of the bandplan.

Let me know if you've got one to sell!

Steve N8KWV


From [e-mail] Fri Jun 30 19:32:59 1995
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From: Alf Green <alf>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for GaAsFETs to buy
Date: 28 Jun 1995 19:41:57 GMT
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[e-mail] (Steve Schiller) wrote:
>
>Well you are right, there are silicon transistors that could do the
>job. But I haven't been able to locate a mail order, or surplus, source
>for any of those either.
>
>
>Actually, I think the BFR91 is about as fast as the MRF901. Don't
>know about the BFR96. I was looking for something with an Ft around
>8GHz.
>


I'd suggest RF Parts, in San Marcos, CA 1-619-744-0750
They carry the MGF 1302/1402 and the NE32184A at reasonable prices.

For a silicon part, I like the MRF571,  fT 8GHz @40mA/8v also from RF Parts at
abt $1:50 ea.

Good luck
Alf  NU8I/G4ABB
[e-mail]
Phoenix, AZ



From [e-mail] Fri Jun 30 19:33:00 1995
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Subject: Looking for schematics/plans for homebrew TNC
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Tue, 27 Jun 95 13:36:53 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 48


>
> I'm looking for plans for a simple but reasonably-performing TNC.
> I've got the skills to etch a board and build the thing, and I might
> even be able to lay my hands on a PROM burner, but I need a plan/place
> to start.
>
> I'd _like_ one that incorporates or can incorporate a 'standard' modem
> disconnect header, and I'd also like one that might be useful for
> working PACSATs someday (with appropriate modifications, if
> necessary).  It would also be nice if it either had a state machine
> DCD or used an XR-2211 (so that I could use the TAPR mod).
>
> Any or all of these extras are negotiable.  What's _not_ negotiable is
> at least KISS capability (I'd use a Baycom, otherwise).  I want to use
> this with Linux, and KISS _might_ be all I'd need, but I'd still be
> happier with more.
>
> Any pointers/tips?  I'm living on a budget that would starve a
> field-mouse, so I'm looking to do things on the cheap.  Any help would
> be appreciated...
> --
> o David Negaard                         o [e-mail]
> o Help Desk Technician            o http://www.graceland.edu/~negaard
> o 700 College Avenue              o linux-phile
> o Lamoni, IA  50140               o 73 de KB0PXK
>
>

The only plans that I've seen for "a simple but reasonably-performing
TNC" are for the TAPR TNC-2A.  I purchased a bare board at Dayton 2
years ago.  Came with the documentation and firmware on diskette.
You might want to contact TAPR and ask if they are still available.
Mind you, it's not really a "simple" TNC...it's a full blown upgradable
board.

Regards...Hugh  VA3TO  Toronto


---
 ■ NFX v1.3 [000]

--
---------------------------------------------------------------------
  HumberNet LSS (Learning Support System) - Humber College, Toronto
     "Tomorrow's communication and learning environment, today"
          Visit our Website at http://humnet.humberc.on.ca/



From [e-mail] Fri Jun 30 19:33:01 1995
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From: [e-mail] (JBLS)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Looking to transmit CW from PC
Date: 30 Jun 1995 04:39:32 -0400
Organization: America Online, Inc. (1-800-827-6364)
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Xref: grape.epix.net rec.radio.amateur.misc:81964 rec.radio.amateur.homebrew:8055

>I'm looking for software that can be used with a simple interface to
>send CW on an HF transceiver.  Receive would be a nice plus, but not
>necessary.  Is there anything out there like this?

>73...Jim  N2VNO

Try HAMCOM30. A schematic is in the program's docs on how to build the
interface. It is relatively simple (I am in process of building one---in
fact the PCB is at this moment being etched in my bathroom!!) to build the
interface. It is available, I believe, by FTP at oakland.edu (not quite
sure of the name).

John
KE6TGN


From [e-mail] Fri Jun 30 19:33:02 1995
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From: [e-mail] (Glenn Sparks)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Looking to transmit CW from PC
Date: 30 Jun 1995 14:14:58 GMT
Organization: Netcom
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In <3svils$[e-mail]> [e-mail] (CRONIN)
writes:
>
>
>I'm looking for software that can be used with a simple interface to
>send CW on an HF transceiver.  Receive would be a nice plus, but not
>necessary.  Is there anything out there like this?
>
>73...Jim  N2VNO
>

Look on QRZ web server at http://www.qrz.com

Under the FTP option go into the files section, then the morse.  There
are several files here.  The ones I'm familiar with that I think do
what you want is PROCW and CW104.  It has been a year or two since I
played with them, but I think they will do what you want.

or if you have a CD go ahead and spring $25 for the CD and get lots of
shareware stuff.

I am in no way associated with QRZ, just a satisfied customer.

KI5GY   Sparky


From [e-mail] Fri Jun 30 19:33:03 1995
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low phase noise VCO design
Date: 29 Jun 1995 02:38:25 GMT
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In article <3sq00g$[e-mail]>, Elendir <[e-mail]> wrote:
>
>
>Hello.
>I'm looking (in the scope to build up a good rx)
>for a design of a very low phase noise VCO.
>Typically, I seek something very near what the ARRL book
>qualifies as 'excellent'
>
>I'll eat everything, every piece of bread :-)
>
>Thanks !
>Vince
>
>--
>F5RCS - Worldwide Friendship through Amateur Radio
>ENST, Ecole Nationale Superieure des Telecommunications, Paris

Tap way down on the tank circuit with the transistor connections.
And use the highest Q tank you can get.  Below 20 MHz., use a
Fair-Rite #67 toroid with a few dozen turns of fine magnet wire.
Above 20 MHz, use #68.  Above 150 MHz, use an air core coil in
a shield can.  Use a large L/C ratio in your tank.

Rick Karlquist N6RK
[e-mail]



From [e-mail] Fri Jun 30 19:33:04 1995
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From: [e-mail] (Donald J. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low phase noise VCO design
Date: 29 Jun 1995 05:30:56 -0700
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
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Richard Karlquist ([e-mail]) wrote:

: a shield can.  Use a large L/C ratio in your tank.

Huh?

When a parallel tank is loaded with a resistance, the Q is equal to
that resistance divided by the reactance of the L or C (it doesn't
matter which, since the two reactances are equal in magnitude at
resonance).

If large L's are used, the reactance goes up, the Q goes down, and
the phase noise increases, per theory.

In the real world, there are other complications.  For a given frequency
of operation, high quality inductors can be fabricated over only a
finite range of inductance, so the designer is constrained from using an
arbitrarily small value of inductance.

Later,


--
-------------------------------------------------
Don Miller         My opinions are my own!
[e-mail]
-------------------------------------------------


From [e-mail] Fri Jun 30 19:33:04 1995
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From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low phase noise VCO design
Date: 29 Jun 1995 17:09:41 GMT
Organization: ENST - Telecom Paris
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Thanks for all answers.
Here is what I thought before asking :

- Using a high Q tank.
- Using two varicaps
- Optimizing the input impedance for lowest noise (but how to compute Zin ?)
- Using a high frequency reference in the loop
- Using a TCXO as refrence crystal
- Divide the output of the VCO (I mean divide its frequency)

What would be the type of oscillator that would generate the less phase noise ?

Thanks and 73s.
Vince, F5RCS/I2


From [e-mail] Fri Jun 30 19:33:05 1995
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From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low phase noise VCO design
Date: 29 Jun 1995 23:42:49 GMT
Organization: SunSoft South, Los Angeles, CA
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Message-ID: <3svdpp$[e-mail]>
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NNTP-Posting-Host: sunspot.west.sun.com

In article <3su6e0$[e-mail]>, Donald J. Miller <[e-mail]> wrote:
>Richard Karlquist ([e-mail]) wrote:
>
>: a shield can.  Use a large L/C ratio in your tank.
>
>Huh?
>
>When a parallel tank is loaded with a resistance, the Q is equal to
>that resistance divided by the reactance of the L or C (it doesn't
>matter which, since the two reactances are equal in magnitude at
>resonance).

Isn't the usual case where the resistance is in series with the
reactive components?  In this case, Q = X/R; larger X gives a
larger Q for a constant R.  Of course, the R isn't constant,
it goes up linearly as the turns on the inductor increase, but
the inductance is proportional to the square of the turns; thus
a larger L is better for high Q.  I'd also guess using a larger
L means that the smaller C required will also have a higher
Q...

>If large L's are used, the reactance goes up, the Q goes down, and
>the phase noise increases, per theory.

See above.  I'd guess that parallel loading of tank circuits
isn't as much of a problem as the component series R.

>In the real world, there are other complications.  For a given frequency
>of operation, high quality inductors can be fabricated over only a
>finite range of inductance, so the designer is constrained from using an
>arbitrarily small value of inductance.

At upper UHF+, there are some neato ceramic resonators available,
but they're kind of exotic for home experimentation as far as I
can tell, since they have to be fabricated to the desired frequency.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Fri Jun 30 19:33:08 1995
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From: [e-mail] (Donald J. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low phase noise VCO design
Date: 29 Jun 1995 19:42:16 -0700
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Dana Myers ([e-mail]) wrote:

: Isn't the usual case where the resistance is in series with the
: reactive components?  In this case, Q = X/R; larger X gives a
: larger Q for a constant R.  Of course, the R isn't constant,
: it goes up linearly as the turns on the inductor increase, but
: the inductance is proportional to the square of the turns; thus
: a larger L is better for high Q.  I'd also guess using a larger
: L means that the smaller C required will also have a higher
: Q...

The loading is indeed parallel in general, however.  Remember Rick's
suggestion that the load be tapped well down on the tank?  This tapped-C
(or alternatively) tapped L arrangement is used as an impedance transformer
so that the tank sees a higher *parallel* resistance.  Keep in mind that
it is the  circuit *loaded* Q and not just the component Q that matters
here.

I guess the main problem with your argument is that you are talking
about component Q, not tank Q.  When calculating the Q of a parrallel
resonant circuit, you must model the resistance in parallel with circuit.
The Q of a series resonant circuit is modeled with the resistor in
series.

When calculating *component* Q, you can model the resistor as being
in series *or* parallel.  In fact, you can do a transformation from
one case to the other.

Consider a 1 uH inductor with 0.1 ohms in series at 1 MHz:

     * The component Q is (2*Pi*1E6*1E-6)/0.1 = XL/Rs = 62.8

     * The equivilent parallel Rp = Rs*Q^2 = 394.78

     * Now you can compute Q as Rp/XL = 394.78/6.28 = 62.8

So I guess you could use your series Q formula as long as you
transformed the tank load to the inductor in series, and then
added it to the inductor's own series resistance, and then
computed the Q.  Once you started considering your neglected
tank load term, I think you would reach the same conclusions
I did.  For cases where the resonator is litely coupled into
the circuit (possible for high device gains), your analysis
is absolutely correct.

: >If large L's are used, the reactance goes up, the Q goes down, and
: >the phase noise increases, per theory.

I guess I should have used the term "loaded Q" here.

: See above.  I'd guess that parallel loading of tank circuits
: isn't as much of a problem as the component series R.

Well, power *is* extracted from the tank, so you better consider it.
At low frequencies, where you can use devices with outrageous gain, then
the tank can be quite isolated.  At higher frequencies, however, the
tank will generally see more of a load.  Since the device gain is lower,
the tank will "see" the device input port more, since more power must
be coupled out of the resonator to keep the loop gain above unity.

: At upper UHF+, there are some neato ceramic resonators available,
: but they're kind of exotic for home experimentation as far as I
: can tell, since they have to be fabricated to the desired frequency.

These are coaxial structures that behave as shorted transmission lines
with a characteristic impedance of something like 6 ohms.  They are
easy to work with: I am currently developing a modem product that uses
three of those type of oscillators.  The small packaged 900 MHz
oscillators in cellular phones usually use them as well.  The home
experimenter can build simular oscillators by using shorted sections
of hardline (but at a bit of a size penalty :)

If you can get hold of a resonator that is for a *lower* frequency
that you desire, you can in fact do some homebrew however:

1) Secure the resonator in a rubber Jaw vise, such as a Panavise, so
   as not to damage the plating.

2) Carefully heat the center pin and pull it out with needle nose pliers.

3) The end of the resonator that had the center pin is not plated.
   You can grind this end.  This is best done quite slowly, with a fast,
   fine, wet grinding wheel.  Your fingers may be at risk if you are not
   extremeely careful.

4) When you are satisfied with the length, solder the center pin back in.
   Use 2% silver bearing solder.

5) Most of these resonators use a silver plating.  Solder them to your
   circuit using 2% silver bearing solder, or the silver will leech or
   disolve into the tin-lead solder, ruining the resonator.

6) If you grind too far, capacitive loading can generaally be used to
   place your oscillator back on frequency.  It is typical to couple
   a varactor or trim-cap in to the "tank" with a 1 pf cap.  Tenths
   of picofarads count.

Have fun!

--
-------------------------------------------------
Don Miller         My opinions are my own!
[e-mail]
-------------------------------------------------


From [e-mail] Fri Jun 30 19:33:09 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low phase noise VCO design
Date: 30 Jun 1995 19:53:21 GMT
Organization: ENST - Telecom Paris
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References: <3sq00g$[e-mail]> <3st3n1$[e-mail]> <3su6e0$[e-mail]> <3svdpp$[e-mail]> <3svoa8$[e-mail]>
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X-Newsreader: TIN [version 1.2 PL2]

I'm bazck...

Well. Okay for using a large L with a small C.
But what about capacitive leakage ? Stray capacitance ?
What about the Q of the varicaps ?

There is something I don't really figure out :
Which one of these hypothesis is wrong :
1. A small C implemented with a varicap will be more sensitive to thermal or
other types of noise, thereby increasing phase noise of the VCO.
2. Since small changes in varicap command signal produce great swing, the PLL
will reduce more efficently the noise.

Thanks.
Vince - F5RCS


From [e-mail] Fri Jun 30 19:33:10 1995
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From: Chris Spacone <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Mast-mounted pre-amps
Date: 30 Jun 1995 19:17:51 GMT
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[e-mail] (Russ Renaud) wrote:

>
>If relays, how do they get them to switch fast enough without burning out the active device?
>

Sequencers.  When you key the mic it switches the preamp out, then the
transverter (if you are using one) then keys the rig.  Unkey the mike and
it all happens in reverse.  Works great, most of the time.

73, Chris KD6OUB



From [e-mail] Fri Jun 30 19:33:11 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modifying CB Amp for multiband HF use?
Date: 28 Jun 1995 18:52:11 GMT
Organization: Los Alamos National Laboratory
Lines: 39
Message-ID: <3ss8cr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov

[e-mail] (Patrick Stickler) wrote:
>
>
> How difficult/feasible is it to modify a CB amplifier (e.g. 5W -> 30W)
> for use on multiple HF bands? Is it as simple as replacing the final
> filter with several bandswitched filters, or would such an amp not be
> suitable for the lower HF frequencies?
>
> Thanks,
>
> =========================================================================
>  Patrick Stickler * KC4YYY * Orlando, Florida U.S.A. * [e-mail]
> -------------------------------------------------------------------------
>  Don't put off until tomorrow what you can do today; for if you enjoy it
>  today, you can do it again tomorrow...
> =========================================================================


I too have not had any trouble using solid-state CB linears 80-10
meters.  I have only tried a couple, don't have lots of
experience with them, but many if not most of the CB amps
have the same sort of input/output broadband toroid networks as
the typical Ham amp has.  As has been mentioned, harmonic
suppression is marginal but tuners can help both input and
output.
As for the older or current higher power tube amps they will
be quite narrow.  I'm surprised at the comments received about
so-called linears not having any bias at all... I have seen the
innards of several cb amps and they all had biasing networks.
I wonder how much of these comments are from first hand
knowledge or just the typical ham-gut reaction to the nastiest
2-letter word ever invented?  The noise and hash and splatter
that emanates from many CB linears results from the same thing
that causes it on the Ham bands.... non technical operators
overdriving them, one transistor in a push-pull amp being bad,
transmitting into an antenna system with open/shorted/intermittent
cable connections or otherwise highly mismatched, etc.
Jim WB5AOX



From [e-mail] Fri Jun 30 19:33:12 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!vixen.cso.uiuc.edu!prairienet.org!w9sz
From: [e-mail] (Zack Widup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modifying CB Amp for multiband HF use?
Date: 29 Jun 1995 04:39:59 GMT
Organization: University of Illinois at Urbana
Lines: 30
Message-ID: <3staqv$[e-mail]>
References: <3ss8cr$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Zack Widup)
NNTP-Posting-Host: firefly.prairienet.org


In a previous article, [e-mail] (Jim Devenport) says:

>As for the older or current higher power tube amps they will
>be quite narrow.  I'm surprised at the comments received about
>so-called linears not having any bias at all... I have seen the
>innards of several cb amps and they all had biasing networks.
>I wonder how much of these comments are from first hand
>knowledge or just the typical ham-gut reaction to the nastiest
>2-letter word ever invented?  The noise and hash and splatter
>that emanates from many CB linears results from the same thing
>that causes it on the Ham bands.... non technical operators
>overdriving them, one transistor in a push-pull amp being bad,
>transmitting into an antenna system with open/shorted/intermittent
>cable connections or otherwise highly mismatched, etc.
>Jim WB5AOX
>
>

I have seen about a dozen CB solid-state amps in the last few years. They
were in the 60-100 watt range; NONE of them had any biasing networks.
They were all what you would call "off-brands" I had never heard of before.
(Probably made in someone's basement or garage.)

I built an HF amp from the Motorola Applicantion Notes a few years ago
(the AN-762 amp.) This is an excellent amp that puts out about 140 watts
for 5 watts of drive up to 30 MHz. Just need to make sure you put a LP
filter on the output! IMO, this is the way to go!

                                        73, Zack W9SZ


From [e-mail] Fri Jun 30 19:33:13 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modifying CB Amp for multiband HF use?
Date: 29 Jun 1995 09:23:14 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 41
Sender: [e-mail]
Message-ID: <3su9g2$[e-mail]>
References: <3ss8cr$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

>>As for the older or current higher power tube amps they will
be quite narrow.  I'm surprised at the comments received about
so-called linears not having any bias at all... I have seen the
innards of several cb amps and they all had biasing networks.
I wonder how much of these comments are from first hand
knowledge or just the typical ham-gut reaction to the nastiest
2-letter word ever invented?  The noise and hash and splatter
that emanates from many CB linears results from the same thing
that causes it on the Ham bands.... non technical operators
overdriving them, one transistor in a push-pull amp being bad,
transmitting into an antenna system with open/shorted/intermittent
cable connections or otherwise highly mismatched, etc.
Jim WB5AOX<<

Jim, You haven't looked at the amplifiers from a micro level then. The
bias circuits are almost always very poor. They have NO regulation, and
that is what causes or aggrivates the excessive IMD products they produce.


For example, look at a typical 4CX250 B amplifier sold as a "Ham"
amplifie4r to CB operators. They almost always have NO screen regulation,
no control grid regulation (an absolute no no with any amplifier that
operates with grid current) and no metering.

Sweep tube CB style amps are often the same. They let the grid jump around
with the drive power.  Flat-top and non-linear city....here we come!

Even the solid state amplifiers do not use active devices to source
constant bias voltages, so when the drive goes up the device moves into
class C!

I have *yet* to see a well designed CB amplifier, since the end user
demands carrier shift (forward modulation good buddy) with modulation, and
the very act of complying with this requirement means the amplifier is
pathatically poor in linearity.

CB amplifiers are by far and large absolute junk. They don't belong on
amateur bands unless the user understands the proper way to modify them
and that includes biasing as well as input and output circuits.

73 Tom


From [e-mail] Fri Jun 30 19:33:14 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Modifying CB Amp for multiband HF use?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <3smpkn$[e-mail]>
Date: Wed, 28 Jun 1995 12:30:55 GMT
Lines: 35

In article <3smpkn$[e-mail]> [e-mail] (Mike Groves) writes:
>[e-mail] (Patrick Stickler) wrote:
>>How difficult/feasible is it to modify a CB amplifier (e.g. 5W -> 30W)
>>for use on multiple HF bands? Is it as simple as replacing the final
>>filter with several bandswitched filters, or would such an amp not be
>>suitable for the lower HF frequencies?
>
>Hi Pat,
>These amplifiers can often be 'pulled' (or tuned up) to the 10 Meter
>band, but that's about it.  The transistor matching networks are
>always too high Q (narrow band) to support multiple band operation.
>You'ld be doing good to get it to operate over both the sideband and
>FM portions of 10M band at the same time.

That hasn't been my experience, Mike. Most of these amplifiers
seem to be copied direct from the Motorola application note
for a broad band 2-30 MHz 100 watt amplifier. The main problem
with them is that they have little or no filtering in them to
suppress harmonic radiation, just broadband transformers in and
out.  If you put a good output filter on them, tweak the bias,
and watch your drive levels, they can be made into passably fair
amateur HF amps for QRP rigs.

The tube amps, now, are generally adapted from a 1960s ARRL
Handbook design, consisting of multiple sweep tubes in parallel.
They're pretty hopeless. The huge parallel output capacitance
of the tubes makes the output networks funky. Junking them out
for parts is about all they are worth.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Jun 30 19:33:15 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!EU.net!Austria.EU.net!newsfeed.ACO.net!swidir.switch.ch!scsing.switch.ch!news.rediris.es!news.uva.es!simu1.ele.cie.uva.es!jesus
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Data Sheet of LM 1391
Date: 28 Jun 1995 18:30:24 GMT
Organization: Universidad de Valladolid (Spain)
Lines: 28
Message-ID: <3ss740$[e-mail]>
References: <3smd22$[e-mail]>
NNTP-Posting-Host: simu1.ele.cie.uva.es
X-Newsreader: TIN [version 1.2 PL2]

limaux ([e-mail]) wrote:
: I am looking for the data sheet of the LM 1391. I have found this
: chip in a monitor for Horizontal synchro, i suppose. Please send
: the answer in this news group or to :

: [e-mail]

Yes, I have seen this IC in a Philips VGA monitor. It's a PLL to synchonize
the horizontal scan with the HSYNC pulse from the VGA card.

The pins are:
1       Output (Open colector)
2       GND
3       Sync Input
4       Sawtooth input
5       Phase Detector output
6       Regulator Voltage (A simple Zener regulator is included, so, connect
        a resistor to your power suply (20 mA typical))
7       Oscilator Timing (with R to pin 6 and C to GND)
8       Duty Cycle control

From National Semiconductor Special Purpose Linear Devices Databook.

I hope this can help :)
--
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ Jes·s Arias ([e-mail]) $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$


From [e-mail] Fri Jun 30 19:33:15 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!uunet!in1.uu.net!escc.corp.es.com!not-for-mail
From: [e-mail] (Harrison Cooper)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need UHF 1200 baud link
Date: 28 Jun 1995 08:33:37 -0600
Organization: Evans & Sutherland Computer Coorporation
Lines: 14
Message-ID: <3srp81$[e-mail]>
NNTP-Posting-Host: moons.sim.es.com
Summary: UHF 1200 baud link
X-Newsreader: NN version 6.5.0 #1 (NOV)

Anyone know of a small and inexpensive UHF (or better) tx and rx pair
that can handle a 1200 baud bandwidth link.  Or schematics for such.  I
have seen the stuff from Linear, but it won't pass anything better than
300 baud.  Oh, this is a low power, 300' type setup (i.e., no license stuff)
and I believe that the 300 MHz used for wireless alarms and such falls into
this catagory.

[e-mail]

--
| Harrison Cooper                    | email : hcooper@.es.com            |
| SP Hardware Design                 | Phone : [phone] ext 3275      |
| Evans & Sutherland Computer Corp.  | Radio : N7KST  147.04 R, 145.49 R  |
| Salt Lake City, Utah  84158        |         Davis County ARES 147.42 S |


From [e-mail] Fri Jun 30 19:33:16 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!network.ucsd.edu!news-mail-gateway
From: [e-mail] (C. Nathan Sykes)
Newsgroups: rec.radio.amateur.homebrew
Subject: NRZI
Date: 28 Jun 95 07:59:01 GMT
Organization: PSI Process Systems, Inc.
Lines: 9
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I have a computer with a  7201 serial chip in it (similar to the
z8530).  However, it uses high for mark and low for space.  How can I
convert this to Non-Return-to-Zero-Inverted (transition=space, no
transition=mark)?  Anybody with a SCC card schematic?
-------------------------------------------------------------
Nathan Sykes            email: [e-mail]
Sr. Engineer          amprnet: [e-mail]
Process Systems Inc.     ax25: KD4GHG@W4BS.#WESTN.TN.USA.NOAM
-------------------------------------------------------------


From [e-mail] Fri Jun 30 19:33:17 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news2.near.net!sunfish.hi.com!brainiac.hi.com!user
From: [e-mail] (Steve Byan)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: phased array receiving antennas
Date: Wed, 28 Jun 1995 12:49:30 -0400
Organization: Hitachi Computer Products, Inc.
Lines: 33
Message-ID: <[e-mail]>
NNTP-Posting-Host: brainiac.hi.com
Xref: grape.epix.net rec.radio.amateur.antenna:11508 rec.radio.amateur.homebrew:8001

A while back I posted a query to rec.radio.amateur.antenna and
rec.radio.amateur.homebrew about using R-C lattice networks to provide a
wideband Hilbert transformer (90 degree phase shift) for a receive antenna
phasing unit. These networks are commonly used to generate the audio phase
shift for SSB generation or detection.

I asked for a reference on how to design these networks. Yesterday, I
received the June 1995 issue of QEX, which has a great article  on these
networks: "Polyphase Network Calculation usaing a Vector Analysis Method"
by Tetsuo Yoshida, JA1KO.

Thanks to Tetsuo Yoshida for the excellent article, and QEX and ARRL for
publishing this kind of material.

My next problem is designing a high-input-impedance, high-dynamic-range
differential RF amp for the output of the phase shift network.

I've noticed the new JPS antenna noise canceling unit (which is a
phased-array receiving antenna, intended to null locally-generated RFI
noise) must use some kind of wideband phase-shift network, since it covers
at least 3 to 30 MHz with only a two-position bandswitch: low band and
high band. Has anyone opened one of these up? What does the phasing
network look like? Is it a polyphase network? What does JPS use for an
amplifier?

Thanks,
-Steve

--
Steve Byan                                  internet: [e-mail]
Hitachi Computer Products (America), Inc.
1601 Trapelo Road                           phone: [phone]
Waltham, MA 02154                           FAX: [phone]


From [e-mail] Fri Jun 30 19:33:18 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: phased array receiving antennas
Date: 29 Jun 1995 09:32:38 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 43
Sender: [e-mail]
Message-ID: <3sua1m$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: grape.epix.net rec.radio.amateur.antenna:11534 rec.radio.amateur.homebrew:8033


>>A while back I posted a query to rec.radio.amateur.antenna and
rec.radio.amateur.homebrew about using R-C lattice networks to provide a
wideband Hilbert transformer (90 degree phase shift) for a receive antenna
phasing unit. These networks are commonly used to generate the audio phase
shift for SSB generation or detection.

I asked for a reference on how to design these networks. Yesterday, I
received the June 1995 issue of QEX, which has a great article  on these
networks: "Polyphase Network Calculation usaing a Vector Analysis Method"
by Tetsuo Yoshida, JA1KO.

Thanks to Tetsuo Yoshida for the excellent article, and QEX and ARRL for
publishing this kind of material.

My next problem is designing a high-input-impedance, high-dynamic-range
differential RF amp for the output of the phase shift network.

I've noticed the new JPS antenna noise canceling unit (which is a
phased-array receiving antenna, intended to null locally-generated RFI
noise) must use some kind of wideband phase-shift network, since it covers
at least 3 to 30 MHz with only a two-position bandswitch: low band and
high band. Has anyone opened one of these up? What does the phasing
network look like? Is it a polyphase network? What does JPS use for an
amplifier?

Thanks,
-Steve<<

Steve,

I've been using phased arrays on HF since the early 80's. I use coaxial
delay lines and cross fire phasing with broad band untuned loop elements.
Some of the arrays have used as many as eight elements.

I am not sure why you would want to use a RC network for phasing. It does
not seem like an efficient way to obtain phase shift (in this application)
when coaxial delay lines provide lower attenuation and octave band widths
(with proper array design).

Can you expound on the merits of RC networks in this application??

73 Tom


From [e-mail] Fri Jun 30 19:33:18 1995
Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!cs.utexas.edu!math.ohio-state.edu!hobbes.physics.uiowa.edu!news.uiowa.edu!news1.icaen!drenze
From: [e-mail] (Douglas J Renze)
Newsgroups: rec.radio.amateur.homebrew
Subject: QRP-L?
Date: 30 Jun 1995 16:48:01 GMT
Organization: Iowa Computer Aided Engineering Network, University of Iowa
Lines: 10
Message-ID: <3t19s1$[e-mail]>
NNTP-Posting-Host: grind.isca.uiowa.edu

Folks, how do I subscribe to the QRP-L list?  It's been so long since I
was subscribed that I just cain't 'member.

Tnx es 73 de Doug, N0YVW

--
         Doug Renze, N0YVW * [e-mail] * N0YVW @ W0IUQ.ia.usa.na
                                [e-mail]

                           Hitchhiking the Infobahn.


From [e-mail] Fri Jun 30 19:33:19 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!network.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re[2]: DDS & PLL Hybrid Theory
Date: 29 Jun 95 16:04:13 GMT
Organization: ucsd usenet gateway
Lines: 33
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Chris:

        You are correct about the MSB changing being when the DAC output crosses
zero.  Now let's see, where did I leave my brain? :<)

        The problem is that there is phase jitter in the MSB changes.  You are
correct that they average out over time, BUT each individual zero crossing is
VERY likely to be in the wrong place. ( To paraphrase a famous TV guy: Can you
say Phase Noise?).  Any phase noise in the reference will be directly translated
into phase noise in the PLL.  The phase noise will be multiplied by the same
factor as the ratio of PLL output frequency/reference frequency.

        I would say one of your assertions differently.  The low pass (band
pass) filter moves the zero crossing to EXACTLY the right place (not just
closer!).  This is true, of course, only for ideal components.  The amount of
phase noise in the output of the DDS is a measure of how good your DAC/filter
are.  You were pretty close to the answer in your first post.  A DDS output of
20 KHz with a clock rate of 4 MHz and 10 bit DAC will give a MUCH cleaner sine
wave with almost no phase noise.  The same clock frequency with an 8 bit DAC and
a 1.5 MHz output would have a much tougher time holding down the phase noise.

        I have been curious what effect settling time of the DAC has on spurs
and phase noise.  Theory pretty well predicts how far down the spurs will be
from the fundamental for a given number of bits, but many have remarked that
they have seen better results than theory would predict.  I want to look into
the possibility that the settling time amounts to a LPF inherent in the DAC.
This would tend to reduce some of the higher frequency spurs.


Ray Mack
WD5IFS
[e-mail]



From [e-mail] Fri Jun 30 19:33:20 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (TANTONR)
Newsgroups: rec.radio.amateur.homebrew
Subject: REF maual for "2SCtype" rf transistors?
Date: 28 Jun 1995 17:34:20 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <3sshss$[e-mail]>
Reply-To: [e-mail] (TANTONR)
NNTP-Posting-Host: newsbf02.mail.aol.com

Well there- I was just repairing my Ft757GX, and had to replace a pair of
blown 2SC2879's with a pair of 2N5942's in a pinch (no bux for new ones
right now, and I had the 2N's in the junk box).

This got me to wondering- I have a Motorola RF data manual, which comes in
VERY handy in times like this, but BOY would it be nice to have a Toshiba
or equiv. "2SCtype" manual, showing all the stuff that Motorola shows in
their databook.

 It would make "repairing by the seat of my pants" a little more based on
qualitative data than on- "well- looks the same... databook says it puts
out about that much... wonder what the impedance is... what's the effect
of running this 28V part at 14V... put on the safety glasses at power
up...lets try and see :^)

THANX!


From [e-mail] Fri Jun 30 19:33:21 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!cs.utexas.edu!uwm.edu!fnnews.fnal.gov!nntp-server.caltech.edu!ferrari.mst6.lanl.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: REF maual for "2SCtype" rf transistors?
Date: 29 Jun 1995 03:51:25 GMT
Organization: JP Accelerator Works, Inc.
Lines: 15
Message-ID: <3st7vt$[e-mail]>
References: <3sshss$[e-mail]>
NNTP-Posting-Host: dial131.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b1 (Windows; I; 16bit)

What you want is the ECG or NTE replacement parts catalog.  These cross reference
2sC devices (and many others) to their corresponding brand of replacement parts.
You shoud be able to get one at a local TV service parts distributor.  With a litle
work you might be able to deduce which 2N device in your junk box will replace the
2SC device.

--
===================================================================

James M. Potter, President      Internet: [e-mail]
JP Accelerator Works, Inc.      AOL: [e-mail]
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]




From [e-mail] Fri Jun 30 19:33:22 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!spool.mu.edu!bloom-beacon.mit.edu!crl.dec.com!crl.dec.com!nntpd.lkg.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!est.enet.dec.com!randolph
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: REF maual for "2SCtype" rf transistors?
Date: 29 JUN 95 14:40:23
Organization: Digital Equipment Corporation
Lines: 20
Message-ID: <3susd9$[e-mail]>
References: <3sshss$[e-mail]>
NNTP-Posting-Host: pipa.enet.dec.com


In article <3sshss$[e-mail]>, [e-mail] (TANTONR) writes...
>This got me to wondering- I have a Motorola RF data manual, which comes in
>VERY handy in times like this, but BOY would it be nice to have a Toshiba
>or equiv. "2SCtype" manual, showing all the stuff that Motorola shows in
>their databook.

Well, they don't show all the good stuff the Moto books show, like for instance
S-parameters and whatnot, but MCM Electronics sells Japanese "2S" databooks for
transistors, FETs, and diodes. I have only the bipolar transistor book. What
you get is mostly in Japanese, but the data tables use the normal "hFE, Vce,
etc." type symbols, so it's readable.

There's enough detail to allow substitutions. I can also pluck "2SC"
transistors out of old junk radios and know what they're good for. The best
part is all the currently available "2SC" parts are in one book - you don't
have to find a book by a manufacturer that happens to make that particular
part. I wish there was such a thing for "2N" parts!

-Tom R.   N1OOQ   [e-mail]


From [e-mail] Fri Jun 30 19:33:23 1995
Path: grape.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: [e-mail]
Newsgroups: rec.ponds,rec.puzzles,rec.pyrotechnics,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur
Subject: Re: Responding to Spams
Date: 28 Jun 1995 21:10:29 GMT
Organization: iii.net subscriber
Lines: 54
Message-ID: <3ssggo$[e-mail]>
References: <3sobjd$[e-mail]> <[e-mail]> <3sphde$[e-mail]>
NNTP-Posting-Host: bike.iii.net
X-Newsreader: WinVN 0.92.6+
Xref: grape.epix.net rec.ponds:600 rec.puzzles:44763 rec.pyrotechnics:30473 rec.radio.amateur.digital.misc:9160 rec.radio.amateur.equipment:13742 rec.radio.amateur.homebrew:8007

In article <3sphde$[e-mail]>, [e-mail] (Lee Jones) says:
>
>In article <[e-mail]>,
>Tse-Sung Wu  <[e-mail]> wrote:
>>Spam somewhere else, dude.
>
>Folks - re-posting to a spam does nothing but lengthen its life.  You
>want to do something about the spammers (and I'm all for that), contact
>[e-mail].   The big online services (aol, prodigy) seem to
>produce the most spams (probably because they have the most users, and
>many of those are fairly clueless :-).  The good side of that is that
>those big online services also respond very quickly to spamming problems
>originating inside their walls.
>
>The current one we're dealing with did *not* originate there - it came
>from a site called "ixc.net", which means nothing to me, but I'm going to
>send an e-mail to the [e-mail], just in case.
>
>Regards, Lee
>--
>Lee Jones     | "Jesus just left Chicago, and he's bound for New Orleans."
>[e-mail]  |            -Z.Z. Top
>415-390-3356  |

My provider (and many others) just ignores letters like that a lot of the time,
as it's a waste of the providers time, except for the big, stupid fellows
like AOL or prodigy, who like having "Family net access" which is
a bunch of bull.

-Dr. Grant


























From [e-mail] Fri Jun 30 19:33:24 1995
Path: grape.epix.net!news.sprintlink.net!nntp.sunbelt.net!dial-2.r1.scsumt.sunbelt.net!higginsj
From: [e-mail] (Jim Higgins)
Newsgroups: rec.ponds,rec.puzzles,rec.pyrotechnics,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur
Subject: Re: Responding to Spams
Date: Wed, 28 Jun 1995 19:25:44 EDT
Organization: SunBelt.Net
Lines: 20
Message-ID: <[e-mail]>
References: <3sobjd$[e-mail]> <[e-mail]> <3sphde$[e-mail]> <3ssggo$[e-mail]>
NNTP-Posting-Host: dial-2.r1.scsumt.sunbelt.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]
Xref: grape.epix.net rec.ponds:624 rec.puzzles:44797 rec.pyrotechnics:30507 rec.radio.amateur.digital.misc:9176 rec.radio.amateur.equipment:13766 rec.radio.amateur.homebrew:8024


>>Folks - re-posting to a spam does nothing but lengthen its life.  You
>>want to do something about the spammers (and I'm all for that), contact
>>[e-mail].

>My provider (and many others) just ignores letters like that a lot of the time,
>as it's a waste of the providers time, except for the big, stupid fellows
>like AOL or prodigy, who like having "Family net access" which is
>a bunch of bull.

Ever consider that an e-mail message to the spammer from EVERYONE bugged
by it would FLOOD their e-mailbox?... and no one else has to be subjected to
it either...  I have gotten fairly good response to [e-mail]
messages but I approach them very politely as they are easily offended as if
you might be blaming them.


Jim Higgins
[e-mail]
icbm: 33.55.54N, 80.28.13W


From [e-mail] Fri Jun 30 19:33:25 1995
Path: grape.epix.net!news.sprintlink.net!demon!plug.news.pipex.net!pipex!cam.news.pipex.net!pipex!soap.news.pipex.net!pipex!edi.news.pipex.net!pipex!europa.chnt.gtegsc.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in1.uu.net!news.inhouse.compuserve.com!news.production.compuserve.com!news
From: none-set <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Simple UHF receiver circuit needed
Date: 25 Jun 1995 18:15:59 GMT
Organization: via CompuServe Information Service
Lines: 5
Message-ID: <3sk94v$fi7$[e-mail]>

I am looking for a simple circuit which would be
able to receive a single UHF frequency.  Does
anyone know if a kit for something like this exists?
Or, could it easily be done using a crystal?
Thanks for your help!  Greg.


From [e-mail] Fri Jun 30 19:33:25 1995
Path: grape.epix.net!news.sprintlink.net!demon!plug.news.pipex.net!pipex!soap.news.pipex.net!pipex!edi.news.pipex.net!pipex!swrinde!news.uh.edu!uuneo.neosoft.com!usenet
From: David Lee <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Site for QRP stuff???
Date: 29 Jun 1995 05:37:50 GMT
Organization: NeoSoft Internet Services   [phone]
Lines: 33
Message-ID: <3ste7e$[e-mail]>
References: <3sjgi9$[e-mail]> <[e-mail]>
NNTP-Posting-Host: scooter-ppp-d5.neosoft.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 32bit)
To: [e-mail]

[e-mail] (Brian Carling) wrote:
>Newsgroups: rec.radio.amateur.homebrew
>
>RLL>Hi!  I am interested in finding plans & discussions on QRP rigs.  Does anyo
>RLL>know if a site exists on this subject?   --Gerry
>
>Hi Gerry - do a SUBSCRIBE message to
>[e-mail]
>
>you will love it!
>---


Hi Brian-

Saw your interesting reponse to Gerry's post.  I tried to subscribe by
sending message to [e-mail]; and put "subscribe" on first line of
message.  Nothing entered as Subject.  Didn't work.  Can you advise me of
my error?

thanks

-dave


--
============================================
David D. Lee, AB5AX, Houston, Tx
Internet:   [e-mail]
Compuserve: 71330,2022
"Take 2 aspirin and call me at Turtle Island..."




From [e-mail] Fri Jun 30 19:33:26 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!demon!plug.news.pipex.net!pipex!edi.news.pipex.net!pipex!swrinde!cs.utexas.edu!uwm.edu!newsspool.doit.wisc.edu!night.primate.wisc.edu!aplcenmp!wb3ffv!hambbs!Mike.Czuhajewski
From: [e-mail] (Mike Czuhajewski)
Subject: Re: Site for QRP stuff???
Sender: [e-mail] (Mike Czuhajewski)
Message-ID: <[e-mail]>
Date: Thu, 29 Jun 1995 03:41:06 GMT
Reply-To: [e-mail] (Mike Czuhajewski)
References: <3sjgi9$[e-mail]> <3snec1$[e-mail]>
X-Posting-Software: UniBoard 2.00beta3 S/N 329931
Organization: The WB3FFV Amateur Radio Internet BBS
Lines: 26

The proper way to subscribe to the QRP list is to send e-mail to

    [e-mail]        [do NOT send to [e-mail] or
                                the entire list of over 500 people
and in the text say,            will see it...and it will not get you
                                subscribed, anyhow :-)  ]
     subscribe QRP-L

That's QRP-L, with an "ell" at the end. People always used to advertise
it as "qrp-l", and that often caused confusion; some thought that
final character was the number one (1).  It is not case sensitive, and
either way will work, but when telling someone else about it you should
type it in upper case to eliminate confusion.

The mailing list also has a daily digest function available, which can
be a god-send for some people, as it bundles all the days messages into
a single e-mail message addressed to you.  If you are not subscribed to
the digest, you will receive a large quantity of mail every day, which
causes problems for many people for a variety of reasons.  Information
on getting the digest will be included in the automatic "welcome"
message you will receive shortly after subscribing.
Typical daily traffic averages well over 20 messages.  (If you are on a
system which charges by the number of messages received, the digest
will help.  If charged by the byte, it will not help.)

73 and Queue Our Pea DE WA8MCQ


From [e-mail] Fri Jun 30 19:33:27 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!howland.reston.ans.net!ix.netcom.com!netcom.com!n1ist
From: [e-mail] (Michael L. Ardai)
Subject: Re: Site for QRP stuff???
Message-ID: <[e-mail]>
Organization: Utopia Planetia Shipyards - Mars
References: <3sjgi9$[e-mail]> <[e-mail]>
Date: Thu, 29 Jun 1995 15:02:26 GMT
Lines: 24
Sender: [e-mail]

In article <[e-mail]> [e-mail] (Brian Carling) writes:
-Newsgroups: rec.radio.amateur.homebrew
-RLL>Hi!  I am interested in finding plans & discussions on QRP rigs.  Does
-RLL>anyone know if a site exists on this subject?   --Gerry
-Hi Gerry - do a SUBSCRIBE message to
[e-mail]

Yikes!  Please don't!!!

The subscribe message should go to [e-mail] with the body (the
subject is ignored)

subscribe QRP-L

(or unsubscribe qrp-l to unsubscribe).  Sending it to [e-mail]
sends it to everyone on the list except the automated list manager that
can handle it.

/mike

--
\|/     Michael L. Ardai     N1IST             Teradyne ATB, Boston MA
-*- -------------------------------------------------------------------------
/|\     [e-mail]          [e-mail]


From [e-mail] Fri Jun 30 19:33:28 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news2.near.net!news.umass.edu!nic.umass.edu!deimos.oit.umass.edu!LEMPICKI
From: [e-mail] (Robyn Lyn Lempicki)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Site for QRP stuff???
Date: 30 Jun 1995 01:35:23 GMT
Organization: University of Massachusetts, Amherst
Lines: 18
Message-ID: <3svkcr$[e-mail]>
References: <3sjgi9$[e-mail]> <[e-mail]> <3ste7e$[e-mail]>
NNTP-Posting-Host: deimos.oit.umass.edu
X-Newsreader: TIN [version 1.2 PL2v [VAX/VMS]]


: Saw your interesting reponse to Gerry's post.  I tried to subscribe by
: sending message to [e-mail]; and put "subscribe" on first line of
: message.  Nothing entered as Subject.  Didn't work.  Can you advise me of
: my error?
: -dave

: ============================================
: David D. Lee, AB5AX, Houston, Tx

Dave, I just did it, so here's the info:

in the body,

SUBSCRIBE QRP-L FULL NAME CALLSIGN

Good Luck!   -Gerry



From [e-mail] Fri Jun 30 19:33:29 1995
Path: grape.epix.net!news.sprintlink.net!cam.news.pipex.net!pipex!edi.news.pipex.net!pipex!sunic!sunic.sunet.se!trane.uninett.no!due.uninett.no!rapid.fi.uib.no!fred
From: [e-mail] (Fred-Johan Pettersen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Some basic info needed
Date: 28 Jun 1995 11:04:34 GMT
Organization: Department of Physics, University of Bergen
Lines: 36
Message-ID: <3srd02$[e-mail]>
NNTP-Posting-Host: polar.fi.uib.no

Hi

I've given up finding any example schematics on the net via News, ftp, or WWW.
The result is that I have to design my own radio receiver.

Here is my plan:

Antenna -> Selective filter ---> Mixer -> Very selective filter -> Demodulator
                             |
     VCO/Variable oscillator-

My assumptions:

1. The antenna delivers a uV signal.
2. There is a need for amplifying the signal from the antenna/filter
3. The selective filter is optional.
4. There are a lot of mixer IC's.
5. There are a lot of demodulator IC's available.

Are these assumptions OK?
I know general electronics, but I'm unexperienced in this field, so any
help will be appreciated.

Fred-Johan

--
Fred-Johan Pettersen  Phone: Office: [phone]
Fysisk institutt             Home:   [phone]
Universitetet i Bergen       Fax:    [phone]
Allegt. 55                   E-mail: [e-mail]
N-5007 Bergen          Or: [e-mail]
WWW: http://www.uib.no/People/nfyfp/fred.html
=========================================================
Remember: Lindyhoppers do it on the floor...
IRMA 1000 medlem nr. 1952
=========================================================


From [e-mail] Fri Jun 30 19:33:30 1995
From: [e-mail] (Bob Liesenfeld)
Path: grape.epix.net!news.sprintlink.net!hookup!bloom-beacon.mit.edu!usc!math.ohio-state.edu!news.cyberstore.ca!skypoint.com!news3.mr.net!mr.net!medtronic.com!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Temp Comp of osc
Message-ID: <[e-mail]>
Date: Mon, 26 Jun 1995 23:47:12 -0100
X-FTN-To: All
Lines: 12

Hi all,
 I have a Colpitts type J-FET oscillator running at 14 MHz that I want
to apply some temperature compensation to. I am familiar with the
standard techniques, but I'm hoping that someone out there may have some
shortcuts to this tedious procedure.
 By the way the un-comped osc currently has a negative temp coefficient.
Thanks for any input!
Bob L.  WB0POQ

   Technology is OUT of control.........




From [e-mail] Fri Jun 30 19:33:30 1995
Path: grape.epix.net!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Temp Comp of osc
Date: 29 Jun 1995 03:19:16 GMT
Organization: News & Observer Public Access
Lines: 24
Message-ID: <3st63k$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: vyger208.nando.net

[e-mail] (Bob Liesenfeld) wrote:
>
> Hi all,
>  I have a Colpitts type J-FET oscillator running at 14 MHz that I want
> to apply some temperature compensation to. I am familiar with the
> standard techniques, but I'm hoping that someone out there may have some
> shortcuts to this tedious procedure.
>  By the way the un-comped osc currently has a negative temp coefficient.
> Thanks for any input!
> Bob L.  WB0POQ

The only simplification for the long and tedious process I know
about is the one used by E.F. Johnson for quite a spell way back when
in the 50s and 60s.  They used a differential capacitor with a
neg temp coeficient on one side of the capacitor, and one of the
same value but a positive coeficient on the other side.  The drift
was corrected by changing the position of the differential cap.
As I recall it still took some time to correct drift, but calibration
didn't change as well while correcting for drift.

73,
Don W3FPR




From [e-mail] Fri Jun 30 19:33:31 1995
Path: grape.epix.net!news.sprintlink.net!simtel!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Temp Comp of osc
Date: 29 Jun 1995 02:35:01 GMT
Organization: Hewlett-Packard
Lines: 23
Message-ID: <3st3gl$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
Bob Liesenfeld <[e-mail]> wrote:
>Hi all,
> I have a Colpitts type J-FET oscillator running at 14 MHz that I want
>to apply some temperature compensation to. I am familiar with the
>standard techniques, but I'm hoping that someone out there may have some
>shortcuts to this tedious procedure.
> By the way the un-comped osc currently has a negative temp coefficient.
>Thanks for any input!
>Bob L.  WB0POQ
>
>   Technology is OUT of control.........

First of all, get rid of the JFET.  A bipolar is typically much
more temperature stable in the first place.

Second, ever heard of the Hallicrafters technique where you use
a differential type air variable connected in series with a P150
and an N1500 fixed capacitor?  You can then continuously vary
the tempco till you hit zero.

Rick Karlquist, N6RK
[e-mail]


From [e-mail] Fri Jun 30 19:33:32 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PAPAWIZARD)
Newsgroups: rec.radio.amateur.homebrew
Subject: TUBES FOR SALE
Date: 29 Jun 1995 12:05:17 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 2
Sender: [e-mail]
Message-ID: <3suivt$[e-mail]>
Reply-To: [e-mail] (PAPAWIZARD)
NNTP-Posting-Host: newsbf02.mail.aol.com

I have thousands of NEW tubes for sell at reasonable prices.
Please send reply direct to [e-mail].


From [e-mail] Fri Jun 30 19:33:32 1995
Path: grape.epix.net!news.sprintlink.net!matlock.mindspring.com!n4da.mindspring.com!n4da
From: [e-mail] (Luther M. Lord)
Newsgroups: rec.radio.amateur.homebrew
Subject: Videos for repair and alignment
Date: Thu, 29 Jun 1995 00:43:24 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 9
Message-ID: <[e-mail]>
NNTP-Posting-Host: n4da.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

For a complete listing of all the videos available for the repair and
alignment of HF radios; visit the Radio Doctor's home page.
at:
-------------------------------------------------------------------------------
  http://www.mindspring.com/~n4da/top.html
-------------------------------------------------------------------------------
The Radio Doctor's home page describes each video in detail along with full




From [e-mail] Fri Jun 30 19:33:33 1995
Path: grape.epix.net!news.sprintlink.net!cei.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: Hallicrafter S-38 to S-38c
Date: 28 Jun 1995 22:14:30 GMT
Organization: World Link
Lines: 1
Message-ID: <3ssk86$[e-mail]>
NNTP-Posting-Host: slip3.fs.cei.net
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)




From [e-mail] Fri Jun 30 19:33:33 1995
Path: grape.epix.net!news.sprintlink.net!cei.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: Hallicrafter S-38 to S-38c
Date: 28 Jun 1995 22:16:57 GMT
Organization: World Link
Lines: 1
Message-ID: <3sskcp$[e-mail]>
NNTP-Posting-Host: slip3.fs.cei.net
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

I want to buy a Hallicrafter model S-38 to S-38c from anyone looking to get rid of one.  Will pay good for a COMPLETE radio.


From [e-mail] Fri Jun 30 19:33:34 1995
Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!cs.uoregon.edu!reuter.cse.ogi.edu!netnews.cc.wwu.edu!netnews.nwnet.net!fred.uswnvg.com!jdonimi
From: [e-mail] (Jeremy A. Donimirski)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Kenwood YK-88 Filter Board
Date: 28 Jun 1995 20:11:14 GMT
Organization: U S WEST NewVector Group, Inc.
Lines: 14
Message-ID: <3ssd12$[e-mail]>
NNTP-Posting-Host: nv2.uswnvg.com
X-Newsreader: TIN [version 1.2 PL2]

f you've purchased a Kenwood YK-88 crystal filter recently, you noticed
it's the same filter as always but now it comes soldered to a daughter
board. If you installed that crystal filter in an older rig (TS-940,
TS-440) you had to remove the filter from the daughterboard before you
soldered it into your rig.

I want that daughter board and will pay $10 for one and I will pay the
postage besides.

Contact me at [e-mail] or call me at [phone].






From [e-mail] Fri Jun 30 19:33:35 1995
Path: grape.epix.net!news.sprintlink.net!matlock.mindspring.com!n4da.mindspring.com!n4da
From: [e-mail] (Luther M. Lord)
Newsgroups: rec.radio.amateur.homebrew
Subject: WWW site for radio repairs and info
Date: Wed, 28 Jun 1995 11:22:13 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: n4da.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

From: [e-mail] (Luther M. Lord)
Subject: WWW site for radio repairs and info
Date: Wed, 28 Jun 1995 10:52:51 -0400

If you need a good place to get your amateur radio repaired; we can help.
Visit the Radio Doctor's home page at:
-------------------------------------------------------------------------------
           http://www.minspring.com/~n4da/top.html
-------------------------------------------------------------------------------
We will answer all technical questions recieved via E-Mail. This sevice is
offered presently at no charge.
Our E-Mail address is:
-------------------------------------------------------------------------------
   [e-mail]




From [e-mail] Fri Jun 30 19:33:35 1995
Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!news.sprintlink.net!matlock.mindspring.com!n4da.mindspring.com!n4da
From: [e-mail] (Luther M. Lord)
Newsgroups: rec.radio.amateur.homebrew
Subject: WWW site for radio repairs and info (correction)
Date: Wed, 28 Jun 1995 19:37:01 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: n4da.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

The URL address for the Radio Doctor's home page was incorrect in my previous
listing. It is correct as follows:
-------------------------------------------------------------------------------
  http://www.mindspring.com/~n4da/top.html
-----------------------------------------------------------------------------
The letter d was left out of the word mindspring