World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1995_09/_homebre.txt

Text File | 1997-02-01 | 388KB | 9,397 lines

The World of Ham Radio CD-ROM



From [e-mail] Mon Sep 04 15:09:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Plans for solid state HF Linear
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Motorola has several excellent ap notes on the subject and they can be
had for free on their internet home page.
Regards, Al




From [e-mail] Mon Sep 04 15:09:15 1995
Path: grape.epix.net!news.sprintlink.net!gryphon.phoenix.net!usenet
From: "T. Hanson" <[e-mail]>
Newsgroups: soc.culture.russian,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.ham-radio,ott.jobs,ott.forsale.other,ott.forsale.computing,ont.jobs,newbridge.rec,newbridge.notice,newbridge.forsale,misc.invest.technical,misc.invest.stocks,misc.invest.canada,bc.jobs,alt.current-events.russia,ab.jobs
Subject: Re: $1,800 WEEKLY! MAILING OUR CIRCULARS
Date: 1 Sep 1995 03:39:00 GMT
Organization: Phoenix Data Systems
Lines: 38
Message-ID: <425v8k$[e-mail]>
References: <41ii92$[e-mail]> <[e-mail]> <41t2vt$[e-mail]> <41t842$[e-mail]> <41v3t2$[e-mail]>
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[e-mail] (Igor Chudov @ home) wrote:
>John L. Rouse ([e-mail]) wrote:
>* Bell-Northern Research <[e-mail]> wrote:
>* >
>* > Come and visit our WWW site we may be able to help you advertise your mail
>* > order business.  We offer many different types of jobs and income opportunities
Isn't it funny how by you spamming back you get your site spammed all
around.  When will you self appointed internet police learn to ignore the
post, and mail the postmaster.


>* > for everyone!!
>* >
>* > http:******
>* >
>* Boy, this really has a lot to do with ham radio, doesn't it?
>* Just another example of the greedy in hot pursuit of the
>* greenback without actually spending money for advertising..
>* I see this is also copied to alt.current-events.russia. Lots
>* of potential there -- get your kiosk on the Internet, hi...
>
>Just mail to his postmaster.
>--
>    - Igor. SCS&R Yellow Pages: http://www.galstar.com/~ichudov/index.html
>   For public PGP key, finger me or send email with Subject "send pgp key"
>"There is something sexy about a computer nerd."   - actress Sandra Bullock


--

Sincerely,
Todd H. Hanson

E-Mail [e-mail]
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From [e-mail] Mon Sep 04 15:09:16 1995
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From: [e-mail] (Ed Burress)
Newsgroups: rec.radio.amateur.homebrew
Subject: multiband mobile HF antenna plans wanted.........
Date: 1 Sep 1995 13:47:19 -0700
Organization: Tektronix, Inc., Wilsonville,  OR.
Lines: 13
Distribution: usa
Message-ID: <[e-mail]>
NNTP-Posting-Host: sepia.wv.tek.com

I saw a particular antenna design at the last Ham swap meet I attended
which used a loading coil mounted on a motorized threaded shaft which
was used to tune the antenna.  The whole thing was housed in a 4 foot
section of 2" pvc pipe.  You had to supply your own whip antenna
for the top, but this thing would tune up on any frequency!!
If I remember right, the original design was done by a guy named
Don Johnson.

Has anyone seen plans or an article on how to build one of these?
Any pointers would be appreciated.
Thanks,
Ed Burress
KC7GFX


From [e-mail] Mon Sep 04 15:09:17 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home-made low Ohm resistors
Message-ID: <[e-mail]>
Date: 1 Sep 95 15:01:50 EST
References: <420boq$[e-mail]> <42314g$[e-mail]>
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 32

In article <42314g$[e-mail]>, [e-mail] (Gary Chatters) writes:
> In article <420boq$[e-mail]>,
> Gary Davis  <[e-mail]> wrote:
>>I am building a high-amp, variable voltage power supply.  The heart
>>of the circuit is a LM317T voltage regulator, followed by several
>>series pass transistors (2N3055). The output of each transistor should
>>be followed by a .05 Ohm, 2 watt resistor.  Such resistors are not
>>readily available at Radio Shack.
>>
>>Can anyone give me advice on how to custom build such resistors?
>>I have many high ohm, high watt resistors, but need to know how
>>many wraps of wire around the resistors are needed for .05 ohms?
>>
>
> The ARRL Handbook has a table of properties of copper wire.
> For example, 20 guage copper wire has a resistance of 10 milliohms
> per foot.
>
> gc

Use Nichrome (Nickel/Chromium) alloy wire. It is a fairly high resistance wire
(don't remember the ohms/ft) used for winding resistors and heating elements.
We used to use it for model rocket engine ignitors. Back in Jr high school, I
borrowed a few yards from the lab. I'm sure you can get it from elect.
suppliers.
One problem is you cannot solder to it. Screw the ends to a barrier strip.


Joe - AA3GN
--
Joe Landis - Systems and Network Manager - North American Drager - Telford, PA
[e-mail]                        ..speaking only for myself, of course..


From [e-mail] Mon Sep 04 15:09:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!gatech!howland.reston.ans.net!tank.news.pipex.net!pipex!wave.news.pipex.net!pipex!dish.news.pipex.net!pipex!bt!btnet!uunet!in1.uu.net!ncrgw2.ncr.com!ncrhub2!ncrcae!news
From: AT&T GIS <[e-mail]>
Subject: Re: FSK Demodulator schematic?
Message-ID: <[e-mail]>
Sender: [e-mail] (news)
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Organization: MSGSC Columbia, SC
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References: <425h92$[e-mail]>
Date: Fri, 1 Sep 1995 16:48:32 GMT
Lines: 22

You are right.. In a 1980/81 QST there were plans for this
MOulator/DEModulator. I built several for some friends & myself to do rtty &
cw with our Radio Shack Model I Computers. Chip was 2207 & 2210, I think. I'll
look in my mothballs when I get time. If you don't get another answer, post
again here with a mailing address.

Happy Hamming,
Bob Archer, N4ECO

>==========RudyKEVY, 8/31/95==========
>
>I'd like to put together a little outboard (serial port) FS
>demodulator.
>I believe that there is a chip out there which does much of the
>work and
>would take  audio output from my transceiver and give me TTL
>level input
>to my computer.  Any suggestions as to where to look for a
>schematic or
>the chip?  Thanks for your help.
>
Bob Archer N4ECO


From [e-mail] Mon Sep 04 15:09:19 1995
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From: [e-mail] (RudyKEVY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FSK Demodulator schematic?
Date: 1 Sep 1995 18:54:41 -0400
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
Message-ID: <4282vh$[e-mail]>
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NNTP-Posting-Host: newsbf02.mail.aol.com

Thanks for your comments, Pat especially those pertaining to the type of
input I need to the computer.

The op amp circuit you describe is not the one I am after.  That is a
"comparator" type demodulator and feeds a squared up audio signal to the
computer where the software does the rest of the job.  This works quite
well for SSTV and (I am told) fairly well for RTTY, etc.  However I want
to do the frequency to voltage conversion outside the computer and feed
some really promising software for the commercial and amateur TOR modes.


From [e-mail] Mon Sep 04 15:09:20 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.iadfw.net!usenet
From: [e-mail] (Floyd Adams)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment
Subject: Re: Sub-audible tone generator
Date: Fri, 01 Sep 1995 21:41:05 GMT
Organization: Internet America
Lines: 24
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[e-mail] (Butch Magee) wrote:

>I have a Kenwood tr-7950 that does not have the optional tu-79 tone unit
>installed.  Kenwood says that option is no longer available.  does any
>one know of a way to build one?  The local repeaters are all using 100Hz
>tones, so thats the only one I will need.
>Any info about how to make one or how to modify another unit to work in
>the 7950 would be appreciated.

>Thanks,

>Butch KF5DE

Butch, It shouldn't be that hard to put in an aftermarket tone board.
The factory board will only let you set it up for three different
frequencies, if I remember correctly.  If you only need one frequency,
I would look at one of the miniature tone boards that Communications
Specialists sell.  They are available from a lot of the mail order
places.  They are very simple to hook up.  The original factory tone
board plugged into a small plug on the 7950.  My guess it was a B+,
GND and tone into the radio line.  Even if it is not, you can call
Communications Spealists and they will tell you where to connect their
boards on most radios.  I hope this helps....73's  Floyd  WD5ENJ



From [e-mail] Mon Sep 04 15:09:21 1995
Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!gatech!newsfeed.internetmci.com!solaris.cc.vt.edu!swiss.ans.net!netnews.lightside.com!user55.lightside.com!user
From: [e-mail] (Raymond J. Sarrio)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Mod. Manual??
Date: Sat, 02 Sep 1995 00:30:40 +0100
Organization: Raymond Sarrio Co.
Lines: 6
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Check out the Artsci Mod books, all major brands covered. The manual is
discounted at URL http://www.csz.com/sarrio.html. 73's Ray

--
Ray Sarrio Co.
http://www.csz.com/sarrio.html


From [e-mail] Mon Sep 04 15:09:22 1995
Path: grape.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!netnews
From: [e-mail] (Gerald Phillips )
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: DJ580T mod question
Date: 2 Sep 1995 00:57:28 GMT
Organization: Netcom
Lines: 10
Message-ID: <428a5o$[e-mail]>
NNTP-Posting-Host: ix-tf8-11.ix.netcom.com
Xref: grape.epix.net rec.radio.amateur.misc:85900 rec.radio.amateur.homebrew:9292

I am atempting to do the extended receive mod. on my DJ580T.  I know
that you are supposed to cut the red wire, but I want to make sure
which wire you cut.  With the unit's display facing up and the bottom
removed you can see a "red" loop wire that is about the same size as
the blue one, and then there is a small "orange/red" wire at the top.
I believe I cut the larger loop which is red and not the smaller loop
that is orange/red.  If anyone can clear this up for me I would greatly
appreciate it.  Thanks and 73.

KE4MBD - Travis


From [e-mail] Mon Sep 04 15:09:22 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: $1,800
Date: 2 Sep 1995 05:26:15 GMT
Organization: Real/Time Communications - Bob Gustwick and Associates
Lines: 3
Message-ID: <428ptn$[e-mail]>
NNTP-Posting-Host: jake-5i.ip.realtime.net
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Why is this article here?? It's outright commercial advertising, free of charge! If it were in my power, I would
delete every one of them!!



From [e-mail] Mon Sep 04 15:09:24 1995
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Push-pull, grounded-screen amplifer.
Date: Sat, 02 Sep 95 07:58:31 GMT
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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X-Newsreader: News Xpress Version 1.0 Beta #4

   "Al Koblinski  (W7XA)" <[e-mail]> wrote:
>grounded grid and screen I have not seen...

Isn't this a common configuration for tubes like 4-400's (not
push-pull, but grounded grid and screen)?  Sweep tubes, too.

73,

Jack  WB3U


From [e-mail] Mon Sep 04 15:09:25 1995
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From: [e-mail] (PTracy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FSK Demodulator schematic?
Date: 2 Sep 1995 11:22:44 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 37
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In article <4282vh$[e-mail]>, [e-mail] (RudyKEVY)
writes:

> However I want
>to do the frequency to voltage conversion outside the computer and feed
>some really promising software for the commercial and amateur TOR modes.
>
>

Oh, I understand now.  I guess what you are seeking is a true demodulator
part of a MODEM.  Sorry, I can't be of much help in that area.  I am no
expert when it comes to hf modems, but I have grabbed a few files from
here and there on the subject of hf modems. I would probably atttempt to
build a simple one for myself for RTTY, but when you get into some of the
more complicated hf modems & techniques, things get a little more
difficult.  I am pretty much completly ignorant about SITOR, AMTOR, GTOR,
PACTOR, etc..., other than the fact that they exist.  My guess is that the
prices of multimode hf modems reflect the level of sophistication
contained within.  If I had to guess, I would say that the day of the
simple analog band pass filter, followed by a frequency discrimator
/detector/flip-flop have gone the way of the dodo bird, hoop skirts, bobby
sox, and big fins on Caddilacs.  With the prices of DSP products being
what they are, and the capabilities of DSP, I would boldly guess that this
is what will be used for all types of modems in the future, if not
already.  Trying to duplicate this function with discrete parts would be
quite a chore.  I mean shucks, you can go to Radio Shaft, and for a few
bucks, come home with a simple, functional automatic notch filter that
uses digital filtering techniques.  Granted, it's not the best, but try
and duplicate that in the analog world.  Possible, but not easy.  When I
finally get around to fiddling with the RTTY & related modes on hf, I
think I'll just take the lazy mans way, buy a box, and plug it in.  Even a
bad one (MFJ) will probably work better than one that I spent 100 hours
building and troubleshooting.

Good luck to 'ya Rudy(?)  Happy motoring.

Pat Tracy, KE1C


From [e-mail] Mon Sep 04 15:09:26 1995
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From: [e-mail] (LOTTSIM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Fm Transmitter...
Date: 2 Sep 1995 12:09:18 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <429vje$[e-mail]>
Reply-To: [e-mail] (LOTTSIM)
NNTP-Posting-Host: newsbf02.mail.aol.com

I was going to buy this $29 FM Transmitter, but I then I realized it only
transmitted a few feet.  I've seen some FM transmitters that do 3/4 of a
mile, but that don't have stereo line in with dual speaker separation.

I'm no genious at electronics, so I'd really appreciate it if either (A)
somebody could build it for me and I'd pay him/her $65, or (B) Somebody
directs me in the right direction.

One time I made an electrical thing that "buzzes" when you touch the two
wires together...one of my great accomplishments.

Thanks,
Alex Rampell


From [e-mail] Mon Sep 04 15:09:27 1995
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From: [e-mail] (PDRUNEN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tube Manuals FS
Date: 2 Sep 1995 18:00:45 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <42ak6d$[e-mail]>
Reply-To: [e-mail] (PDRUNEN)
NNTP-Posting-Host: newsbf02.mail.aol.com

I have a set of RCA tube manuals as published by RCA back in the early
50's.
These manuals have all the good stuff like design information and load
lines.
They are in good condition and have never been exposed to a harsh
environment.

e-mail for info!

[e-mail]


From [e-mail] Mon Sep 04 15:09:28 1995
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From: [e-mail] (RudyKEVY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FSK Demodulator schematic?
Date: 2 Sep 1995 21:14:46 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <42avi6$[e-mail]>
References: <42ajmt$[e-mail]>
Reply-To: [e-mail] (RudyKEVY)
NNTP-Posting-Host: newsbf02.mail.aol.com

Ok...thanks a lot for the postings and the E-mail.  The AM7911 and EXAR
XR2211 sound most promising.

Just to clarifiy for those who questioned me.  I do use a PK232 and also
some small homebrew comparators (Jan'94 QST) but the object is to feed
some software with especially broad capability for examining and printing
a wide variety of commercial and amateur TOR transmissions.

Since there appears to be some interest I will post my results along with
the software source if/when I get permission to do that and/or it becomes
commercially available.

Thanks again.


From [e-mail] Mon Sep 04 15:09:29 1995
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone ever use that Mr. Beer thing?
Date: Sun, 03 Sep 95 01:46:39 GMT
Lines: 16
Message-ID: <[e-mail]>
References: <420ofn$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (J. L. Blanton) wrote:
> [e-mail] (Paul M. Zeller) wrote:

>> I was browsing my television channels, as I tend to do from time to
>> time, and noticed a thing called Mr. Beer on QVC 2.  Does anyone >>
have any experience with this and is this worth it?  It appears to >>
be cheaply put together.

>Definitely a different kind of 'homebrew'!!!   ;-)

Maybe it's a new type of Beverage antenna.  :)

73,

Jack  WB3U


From [e-mail] Mon Sep 04 15:09:30 1995
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Fm Transmitter...
Date: Sun, 03 Sep 95 01:50:34 GMT
Lines: 13
Message-ID: <[e-mail]>
References: <429vje$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (LOTTSIM) wrote:

>I was going to buy this $29 FM Transmitter, but I then I realized it
>only transmitted a few feet.  I've seen some FM transmitters that do
>3/4 of a mile, but that don't have stereo line in with dual speaker
>separation.
>
>I'm no genious at electronics, so I'd really appreciate it if either
>(A) somebody could build it for me and I'd pay him/her $65,  <<snip>>

Wow, $65.00 to build a transmitter.  I must be in the wrong business.
:)


From [e-mail] Mon Sep 04 15:09:31 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (John B. Lawrence )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone ever use that Mr. Beer thing?
Date: 3 Sep 1995 05:05:48 GMT
Organization: Netcom
Lines: 18
Message-ID: <42bd3c$[e-mail]>
References: <420ofn$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ix-bak-ca1-03.ix.netcom.com

In <[e-mail]> [e-mail] (J. L.
Blanton) writes:
>
>In article <420ofn$[e-mail]>, [e-mail] (Paul M.
>Zeller) wrote:
>
>> I was browsing my television channels, as I tend to do from time to
>> time, and noticed a thing called Mr. Beer on QVC 2.  Does anyone
have
>> any experience with this and is this worth it?  It appears to be
>> cheaply put together.
>
>
>Definitely a different kind of 'homebrew'!!!   ;-)
>
>Lee, WA8YBT/6

Tried it once on 2m but intermod was terrible . . . .


From [e-mail] Mon Sep 04 15:09:32 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!usenet
From: [e-mail] (Dan Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics from Radio Shack
Date: Sun, 03 Sep 1995 06:11:08 GMT
Organization: CRL Dialup Internet Access
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Message-ID: <42bh4r$[e-mail]>
References: <41na2e$[e-mail]>
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[e-mail] (james P. Meyer) wrote:


>Is whatever service manual I might be able to get from R-S going to be
>halfway decent as far as showing me a full schematic with parts
>values?  If so, what's the R-S part number for the manual?

        I can't speak for their SW radios, but the service manual for my
HTX-202 was very complete in that regard.  Cheap too--compared to the
Yaesu one for my FT-530 at $25, RS only wanted $6.59 for this one.

        The part number would probably be MS- followed by the catalog number
of your radio.  The best thing woud be to take the radio to a store
and tell them that you want a service manual for it.  If the
salesperson looks blank at that, ask him/her to call Consumer Mail and
ask for a service manual...  (They may be calling it Radio
Shack/Unlimited by now, I'm not sure).  If the person _still_ doesn't
have a clue, ask for the manager, but it's really not too hard.


--
Dan Brown, KE6MKS
[e-mail], NOT [e-mail]
Don't tread on me.



From [e-mail] Mon Sep 04 15:09:33 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!usenet
From: [e-mail] (Dan Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Power Supply Question...
Date: Sun, 03 Sep 1995 06:19:25 GMT
Organization: CRL Dialup Internet Access
Lines: 33
Message-ID: <42bhkb$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: a105003.sfo5.as.crl.com
X-Newsreader: Forte Free Agent 1.0.82

I've recently come into possession of an (apparently) old power
supply, and I'm wondering if anyone might have info on it.

The nameplate reads:

POWER SUPPLY
MODEL

(stamped) OEM 10E P 1912 (may be 1942)

INPUT 105-125V., 47-429 CPS

POWER/MATE CORP.
Hackensack, N. J.


It measures about 5" square by 9 1/2" long, and is labeled "REGULATED
POWER SUPPLY" on the front, with a pot for voltage adjustment.  AC
input, DC output, and "Sense" (+ and -) are via a 6-position barrier
strip.

One transformer occupies the back half of the unit; another, smaller,
one is nearer the front.

I'm wondering (1) what the voltage/current capacity of this are (I
expect large; the thing weighs a ton), (2) if the company's still in
business, and (3) anything else that might be useful.  Thanks for any
information!
--
Dan Brown, KE6MKS
[e-mail], NOT [e-mail]
Don't tread on me.



From [e-mail] Mon Sep 04 15:09:35 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Grid dipper, tale of woe
Date: Sun, 03 Sep 1995 12:03:54 GMT
Organization: Duke University, Durham, NC, USA
Lines: 105
Message-ID: <42cafi$[e-mail]>
NNTP-Posting-Host: async114.async.duke.edu
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        Please take a moment to read this rather long tale of woe.
I am looking for some sympathy and/or some suggestions about what I
might be able to do to get some action.  At this point, I'm ready to
try just about anything.  What follows is a series of E-mail messages
that resulted from a post I made here in this newsgroup.  Note the
dates:

---------------Message #1----------------------

To: [e-mail] (james P. Meyer)
From: [e-mail] (Mike Barnes)
Subject: Re: WTB: portable grid dip meter
Date: Sun, 16 Jul 1995 13:30:50

[e-mail] (james P. Meyer) writes:

>        I'd like to buy a portable (battery powered) grid dip
>meter (oscillator).  Nothing fancy, just cheap but with all the coils.

>Jim "no sig" Meyer

Jim,

I have a NOVEX that covers 1.5 to 200 Mhz powered by a 9volt batter.
This is in the original box with all coils.  I only used it about 3
times

I am asking $50

Mike
[e-mail]

----------------Message #2----------------------------

Date: Sun, 16 Jul 1995 20:00:14 -0400
X-Sender: [e-mail]
To: [e-mail] (James P. Meyer)
From: [e-mail] (Michael Barnes)
Subject: Re: WTB: portable grid dip meter X-Status:

>>I am asking $50
>>
>>Mike
>>[e-mail]
>
>        All I need is a mailing address, and I'll get a post office money
>order in the mail to you.
>
>Thanks,
>Jim
>
Ok,  send to

Mike Barnes
1233 SE Astorwood Place
Stuart, FL  34994

I will ship the next business day after receiving check

Thanks
Mike
[e-mail]
>

------------------------Message #3------------------------

Date: Fri, 28 Jul 1995 12:33:22 -0400
X-Sender: [e-mail]
To: "James P. Meyer" <[e-mail]>
From: [e-mail] (Michael Barnes)
Subject: Re: Still waiting...

>
>       I haven't heard anything from you since I mailed you the $50.00
>for the grid-dip meter.  If you haven't gotten the money order, please
>let me know.  If you have cashed the MO, please let me know when the
>meter was shipped.
>
>Jim
>
>Received Money Order today 7/28.
>I will try to make it to UPS today otherwise it will ship monday.

Mike
>
----------------------------------------------------------------------

        I've sent several messages to Mike since then, but he hasn't
answered any of them.  I wrote to his Internet provider, gate.net, and
they told me that he is still able to receive messages (is still one
of their customers).  I used the phone and got Mike's number from
information.  I called the number and left a very nice,
non-threatening,
message at the tone, but he hasn't called me back.  I looked him up in
an on-line callbook, and he's listed as a licenced ham.

        Do you think I've been "taken"?  Should I kiss the fifty bucks

goodbye and get on with my life?

Signed: Rejected in Durham





From [e-mail] Mon Sep 04 15:09:36 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer.itd.umich.edu!agate!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics from Radio Shack
Date: Sun, 03 Sep 1995 12:15:13 GMT
Organization: Duke University, Durham, NC, USA
Lines: 26
Message-ID: <42cb4p$[e-mail]>
References: <41na2e$[e-mail]> <42bh4r$[e-mail]>
NNTP-Posting-Host: async114.async.duke.edu
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Dan Brown) wrote:

>[e-mail] (james P. Meyer) wrote:


>>Is whatever service manual I might be able to get from R-S going to be
>>halfway decent as far as showing me a full schematic with parts
>>values?  If so, what's the R-S part number for the manual?

>       I can't speak for their SW radios, but the service manual for my
>HTX-202 was very complete in that regard.  Cheap too--compared to the
>Yaesu one for my FT-530 at $25, RS only wanted $6.59 for this one.

        I ordered the service manual last friday.  Twelve bucks and it will be
mailed to me.  The lady at R-S knew exactly what I wanted and even
remembered 90% of the part number for it!  A quick call to wherever,
resulted in a full part number and price.

        Say what you will about "Radio Shaft" or "Radio Schlock", I have found
that generally I get very good service.  And I've found one store that
will get *all* my R-S business.

Jim "no sig" Meyer





From [e-mail] Mon Sep 04 15:09:37 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!news.ptd.net!news
From: Dave Skarbowski <[e-mail]>
Subject: Re: Power Supply Question...
X-Nntp-Posting-Host: cs1-15.hol.ptd.net
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Lines: 37

[e-mail] (Dan Brown) wrote:
>I've recently come into possession of an (apparently) old power
>supply, and I'm wondering if anyone might have info on it.
>
>The nameplate reads:
>
>POWER SUPPLY
>MODEL
>
>(stamped) OEM 10E P 1912 (may be 1942)
               ^^^
              10 volts

>
>INPUT 105-125V., 47-429 CPS
>
>POWER/MATE CORP.
 ^^^^^^^^^^^^^^^^
They closed their doors in Hacensack NJ about 87' or so and moved to
California.  I'm pretty sure they are completely out of business now.  I
worked as a power suply design engineer for them during the early 80's.

>I'm wondering (1) what the voltage/current capacity of this are (I
>expect large; the thing weighs a ton), (2) if the company's still in
>business, and (3) anything else that might be useful.  Thanks for any
>information!

10 volts @ ????A....sorry, I don't have much info on the current rating
or how to decode the date code.  They made some pretty good OEM supplies
back in the late 70's.  I have several 12 and 15 volt 40 amp models here
that have been powering my shack for 15 plus years without repair.  Hope
this helps....

Dave, n2fam





From [e-mail] Mon Sep 04 15:09:38 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.iii.net!iii2.iii.net!not-for-mail
From: [e-mail] (Thomas C Sefranek)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home-made low Ohm resistors
Date: 3 Sep 1995 13:45:25 -0400
Organization: iii.net
Lines: 7
Message-ID: <42cpjl$[e-mail]>
References: <420boq$[e-mail]> <42314g$[e-mail]> <[e-mail]>
NNTP-Posting-Host: iii2.iii.net

Or, better still consider power FETs, no resistors necessary.
Don't use copper wire, it drifts with temperature.

Tom

--
Thomas C. J. Sefranek  WA1RHP  Work: 508-425-2200


From [e-mail] Mon Sep 04 15:09:39 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!news.cyberstore.ca!van-bc!vanbc.wimsey.com!news.rmii.com!newsjunkie.ans.net!interaccess!d160.nb.interaccess.com!user
From: [e-mail] (Dave Moorman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Vintage Schematics Wanted
Date: Sun, 03 Sep 1995 16:11:43 -0500
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: d182.nb.interaccess.com

In article <[e-mail]>, [e-mail] (Robert Watson) wrote:

> I wish to build a 1930's era transmitter and receiver, I wish for the
project to
> be fairly simple in design.

It might be best to get a copy of the ARRL Handbook from the 30's.

Dave Moorman, K9SW
Downers Grove,
Illinois

--
Still looking for a snappy signature


From [e-mail] Mon Sep 04 15:09:39 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!pipeline!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: HTX100 schem or transverter mods??
Message-ID: <[e-mail]>
Date: 3 Sep 95 17:07:08 EST
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 10
Xref: grape.epix.net rec.radio.amateur.equipment:16579 rec.radio.amateur.homebrew:9312

Hi,
Does anyone have a schematic for the Radio Shack HTX100 10 meter rig,
or has anyone added seperate low-level transmit and recieve?
I'd like to use mine for a 28mhz tunable if for a DEM 432 mhz IF transverter.

Thanks,
Joe - AA3GN
--
Joe Landis - Systems and Network Manager - North American Drager - Telford, PA
[e-mail]                        ..speaking only for myself, of course..


From [e-mail] Mon Sep 04 15:09:40 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Amp parts FS
Date: 3 Sep 1995 17:49:06 GMT
Organization: Real/Time Communications - Bob Gustwick and Associates
Lines: 16
Message-ID: <42cpqi$[e-mail]>
NNTP-Posting-Host: jake-5c.ip.realtime.net
X-Newsreader: AIR News 3.X (SPRY, Inc.)

I have lots of amp parts forsale, a list follows;
(NEW) Peter Dahl plate transformer , primary is 220-240vac, sec, 2000-2400-3040vac rms @ 1amp. CCS
$200 plus shipping 46lbs.
(NEW) electrolitic capacitor bank (11) 800 mf @ 450vdc caps., in series is 73.3 mf @4950vdc  $160
shipped
(NEW) 30 amp power contactors DPDT $15 ea.
(NEW) (2) JENNINGS vac rlys SPST 12kv @5 amps. 26.5 vdc coils ( setup in tandem for T/R rely) $200
shipped.
(USED) load cap 140-1100 pf @2kv $20 shipped
(USED) plate cap (c-1) 150pf @ 4kv $20 shpd
(USED) manual for DRAKE L-75 amp $5 w/sase
(USED) DRAKE L-75 power transformer, good shape. $50 + shpg
(USED) squirrel cage & muffin blowers, misc.
etc. etc. etc. etc. E-mail for more, or to check for other parts or cabinets.
                                                                          Signed, Matt/KK5DR



From [e-mail] Mon Sep 04 15:09:42 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mathworks.com!solaris.cc.vt.edu!swiss.ans.net!newsjunkie.ans.net!lantana.singnet.com.sg!temasek.teleview.com.sg!temasek.teleview.com.sg!not-for-mail
From: [e-mail] (Anderson @ Mpower)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Re: Ultra-miniature Direction-finding Unit
Followup-To: sci.electronics,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Date: 3 Sep 1995 20:35:47 +0800
Organization: Teleview, Singapore Telecom
Lines: 32
Message-ID: <42c7f3$[e-mail]>
References: <cjg007-2604951238200001@145.1.90.177> <[e-mail]> <[e-mail]>
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Xref: grape.epix.net sci.electronics:142116 rec.radio.amateur.homebrew:9301 rec.radio.amateur.antenna:13589 rec.radio.amateur.misc:85916

On behalf of Martin Landeros ([e-mail]), who wrote:


: On Thu, 27 Apr 1995, Mark Kinsler wrote:

: > >I've always thought it would be great if one could make a really small
: > >direction-finding unit that would be the size of a small calculator,
: > >including the antenna (something like James Bond would use).  I'm curious
: > >if anyone has ever tried making such a unit, and would like to share their
: > >experiences with it.  I've never gotten beyond the "thinking about it"
: > >stage myself.
: >
: > Am I imagining it, or did I see a very small direction finding unit that
: > used the GPS satellite in Popular Science or somewhere?   I think it cost
: > about a zillion dollars.  Anyone remember?
: >                                             M Kinsler
: >
: >
:       I just sow one last week on one of those catalogs found on Alaska
: Airlines, I think it was around 500.00 US $$.

:                               Martin.


Are you discussing direction, as in Lat/Lon, or are you discussing
RFemission direction, which I happen to be interested in ?

--
------------------------------------------------------------------
Discover the businesses of MENSA members at the MpowerBase:
http://cyber-active.com/mpower          Mpower Consultants, Ltd.(M^)



From [e-mail] Mon Sep 04 15:09:43 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!cobia.gulf.net!valinor.mythical.com!valinor!n5ial!jim
From: [e-mail] (Jim Graham)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone ever use that Mr. Beer thing?
Message-ID: <[e-mail]>
Date: Sun, 3 Sep 1995 20:49:24 GMT
References: <420ofn$[e-mail]> <[e-mail]>
Organization: Okaloosa Island dep't of fishing/brewing/ham radio/computers
Lines: 37

In article <[e-mail]> [e-mail]
(J. L. Blanton) writes:
>In article <420ofn$[e-mail]>, [e-mail] (Paul M.
>Zeller) wrote:
>
>> I was browsing my television channels, as I tend to do from time to
>> time, and noticed a thing called Mr. Beer on QVC 2.  Does anyone have
>> any experience with this and is this worth it?  It appears to be
>> cheaply put together.

>Definitely a different kind of 'homebrew'!!!   ;-)

Definitely an interesting concept, though....  <grin>

I mean think about it....  I'm assuming (at least, in a humorous and
not-so-serious sense), from where the original poster placed his article
and from the kit's name, that this Mr. Beer kit is an Amateur Radio kit
that works as a radio and also dispenses and/or brews beer.

This could really be a neat thing---it combines two of my hobbies into
one nice, neat package, and could be fun for long nights of operating,
too.  Just picture it...you're in the middle of a nice chat with AMTOR,
PacTOR, or cw (or whatever modes you prefer), and you draw a nice, fresh
IPA, bitter, bock, or even a nice oatmeal stout right straight from your
radio.  Saves a trip (or trips) to the beer fridge!  :-)

Hmmmmm.....I wonder......  <grin>

Later,
   --jim

--
73 DE N5IAL (/4)         MiSTie #49997     < Running Linux 1.2.13 >
      [e-mail]                 ICBM: 30.23N 86.32W
  ||  [e-mail]          Packet:  --OFFLINE-- (Ft. Walton Beach, FL)
E-mail me for information about KAMterm (host mode for Kantronics TNCs).



From [e-mail] Mon Sep 04 15:09:44 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!pipeline!not-for-mail
From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Fm Transmitter...
Date: 4 Sep 1995 00:55:31 -0400
Organization: The Pipeline
Lines: 41
Message-ID: <42e0s3$[e-mail]>
References: <429vje$[e-mail]>
NNTP-Posting-Host: pipe2.nyc.pipeline.com

To: [e-mail] (LOTTSIM)
Subject: Fm Transmitter...
From: acatalan

In rec.radio.amateur.homebrew [e-mail] (LOTTSIM) said:


>I was going to buy this $29 FM Transmitter, but I then I realized it only

>transmitted a few feet.  I've seen some FM transmitters that do 3/4 of a
mile,
>but that don't have stereo line in with dual speaker separation.

I used to build surveillance FM x-mitters for private dicks. That was fun.
You need a stereo x-mitter? Ramsey electronics makes one.. I picked one up
at a ham fest and put it together in an hour and a half. A no brainer,
plenty of
room to work on the board ( no tiny SMT parts) I looked for their address
I can't find the papers. Look in the hobby mags. The heart of the stereo
xmitter was a vlsi chip that did all the multiplexing for the stereo FM
modulating
of the free running oscillator with only one next stage of amplification
really
acting only as a buffer. the output goes to an antenna through a 75 or 100
ohm resistor. I removed that to get a bit more range. As you can imagine
the
FCC would not appreciate a substantial amount of amplification from any
transmitter whose frequency stability is derived from a FREE-running
oscillator.
(licensed or not) My Ramsey stereo FM transmitter works like a charm. I
built
a MONO one in the late 70's which I brought to the beach with me to play
Black Sabbath over the crappy disco stations - DEATH to DISCO!!!!!!!
Pirate FM lives! (at least within a 500 ft perimeter)
You can do it yourself, save your 65 bucks to buy it. I think it was less
than that to buy it. Let me know how you made out and/or if you need any
help.
Anthony G. Catalano 73 de  WW2W ham op

--
Anthony G. Catalano WW2W ham op


From [e-mail] Mon Sep 04 15:09:45 1995
Path: grape.epix.net!usenet
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: multiband mobile HF antenna plans wanted.........
Date: 4 Sep 1995 00:56:27 GMT
Organization: epix.net
Lines: 24
Message-ID: <42dirr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mango.epix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b4 (Windows; I; 16bit)

[e-mail] (Ed Burress) wrote:
;>I saw a particular antenna design at the last Ham swap meet I attended
;>which used a loading coil mounted on a motorized threaded shaft which
;>was used to tune the antenna.  The whole thing was housed in a 4 foot
;>section of 2" pvc pipe.  You had to supply your own whip antenna
;>for the top, but this thing would tune up on any frequency!!
;>If I remember right, the original design was done by a guy named
;>Don Johnson.
;>
;>Has anyone seen plans or an article on how to build one of these?
;>Any pointers would be appreciated.
;>Thanks,
;>Ed Burress
;>KC7GFX
You are right the designer is Don Johnson and the design is published in
a book he wrote "40+5 Years of HF Mobileing. It is available from World
Radio Books for about $15.00 or so. The design may be published in other
places also but I don't know of any. There are also several commerical
sources of the antenna one of which is Hi Sirrea who along with others
adverise in QST and probabbly other places. I recomend the book as its a
very nice bedside reader and tells of many designs over the years.

                                         Garry(WB0NNO)



From [e-mail] Mon Sep 04 15:09:46 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (John B. Lawrence )
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.misc
Subject: Change WBFM to NBFM????
Date: 4 Sep 1995 07:15:33 GMT
Organization: Netcom
Lines: 8
Message-ID: <42e92l$[e-mail]>
References: <429vje$[e-mail]> <42e0s3$[e-mail]>
NNTP-Posting-Host: ix-bak-ca1-23.ix.netcom.com
Xref: grape.epix.net rec.radio.amateur.homebrew:9313 rec.radio.amateur.equipment:16585 rec.radio.amateur.misc:85939

I may purchase a military surplus RT-68/GRC 38 - 54.9mhz FM
transceiver. It uses wide-band FM. Any way to change it to narrow-band
FM? If so, how? I plan to use it for 6m operation.

Thanks

John
KE6TGN


From [e-mail] Mon Sep 04 15:09:47 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!america.com!usenet
From: "Paul C. Barnes" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorcycle intercom
Date: 4 Sep 1995 08:16:04 GMT
Organization: PSS InterNet Services, InterNet in Fl 904 253 7100
Lines: 6
Message-ID: <42eck4$[e-mail]>
References: <4277jn$[e-mail]>
NNTP-Posting-Host: brig.ppp
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

Some of the radio gadget places in the US sell wireless transmitters that
are very small.  Go to an electronic store and browse thru some of the
books and see if there are some ads there for such devices.  In the US
they are fairly cheap and easy to use, just connect to power, microphone
and antenna.  They usually have an accompanying receiver, too.



From [e-mail] Mon Sep 04 15:09:48 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!uknet!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: Re: Push-pull, grounded-screen amplifer.
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Mon, 4 Sep 1995 09:40:58 GMT
Reply-To: [e-mail]
References: <[e-mail]>
Organization: UCL Dept of Medical Physics
Lines: 19

In article [e-mail], [e-mail] (WB3U) writes:
>    "Al Koblinski  (W7XA)" <[e-mail]> wrote:
> >grounded grid and screen I have not seen...
>
> Isn't this a common configuration for tubes like 4-400's (not
> push-pull, but grounded grid and screen)?  Sweep tubes, too.
>
> 73,
>
> Jack  WB3U


I know grounded screen can be used, but I've never seen anything push-pull
grounded screen. I've had some trouble doing this, and woder if there are any
known problems (and hopefully solutions).


davek



From [e-mail] Mon Sep 04 15:09:49 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!uwm.edu!msunews!netnews.upenn.edu!anat3d1.anatomy.upenn.edu!alex
From: [e-mail] (Alex Shrom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE
Date: 4 Sep 1995 16:43:21 GMT
Organization: University of Pennsylvania
Lines: 9
Message-ID: <42fab9$[e-mail]>
References: <[e-mail]> <42561p$[e-mail]> <42e2of$[e-mail]>
NNTP-Posting-Host: anat3d1.anatomy.upenn.edu

Try Information Unlimited, 603-673-4730.  They advertise a kit that
does what you want for $24.50 + $5 S&H.  They advertise bi-monthly in
Popular Electronics (a great mag for strange ads).

--

Alex Shrom  -  [e-mail]  -  Major: History of Cat Art
Princeton '98 http://www.princeton.edu/~ajshrom  Minor: Yes, unfortunately



From [e-mail] Mon Sep 04 15:09:50 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!lucky.innet.com!smithj
From: [e-mail] (Jim Smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics from Radio Shack
Date: Mon, 04 Sep 95 16:58:06 GMT
Organization: Internet Network Corporation
Lines: 24
Message-ID: <42fak8$[e-mail]>
References: <41na2e$[e-mail]> <42bh4r$[e-mail]> <42cb4p$[e-mail]>
NNTP-Posting-Host: tex-37.innet.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <42cb4p$[e-mail]>,
   [e-mail] (james P. Meyer) wrote:
>[e-mail] (Dan Brown) wrote:
>
>
>       I ordered the service manual last friday.  Twelve bucks and it will be
>mailed to me.  The lady at R-S knew exactly what I wanted and even
>remembered 90% of the part number for it!  A quick call to wherever,
>resulted in a full part number and price.
>
>
>
Yup, if you can find a store that hires good people and trains them right, you
got a good one.

I went into a RadShack and asked for a manual and was told they do not sell
them to the general public. When asked why, I was told it was because they
don't want to be responsible if someone modifies a piece of equipment to do
something illegal, or hurt themselves fixing it.

A call to the District Manager solved that. all in all, RadShack is a good
deal, if you can stand the high prices...

Jim N8AVX


From [e-mail] Thu Sep 07 16:51:36 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!bloom-beacon.mit.edu!eru.mt.luth.se!news.kth.se!nac.no!Norway.EU.net!scimitar!it
From: [e-mail] (Ivan Tving)
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorcycle intercom
Date: 1 Sep 1995 15:07:35 GMT
Organization: Dolphin Interconnect Solutions
Lines: 28
Sender: it@scimitar (Ivan Tving)
Distribution: world
Message-ID: <4277jn$[e-mail]>
NNTP-Posting-Host: scimitar.dolphinics.no

Hi,

I would like to build a motorcycle intercom that transmits in the 46Mhz range.
This range is used by illegal cordless phones in Norway, so I shouldn't
interfer with a critical band.

Since I only need a range of approx. 300m, I'll probably only need a few
milliwats. I know how to build the microphone preamplifier, a VOX and the
FM receiver part. But how do I build a fairly frequency stable transmitter
stage using a xtal based oscillator? In other words: how do I get from the
audio signal to the antenna?

It is almost impossible to find litterature in Norway covering these issues.
Please help me out. If you know where to find schematics (books or on the Web)
I would appreciate that information.

Thanks,

Ivan Tving

--
==============================================================================
Ivan Tving, development engineer    | Tel:[phone], Fax:[phone]
Dolphin Interconnect Solutions AS   | Visiting Address: Olaf Helsets vei 6,
E-mail: [e-mail]            | P.O. Box 52 Bogerud, N-0621 Oslo, Norway
------------------------------------------------------------------------------
                    "It's not a job - it's an adventure"
==============================================================================


From [e-mail] Thu Sep 07 16:51:37 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!pipeline!not-for-mail
From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE
Date: 4 Sep 1995 01:27:43 -0400
Organization: The Pipeline
Lines: 15
Message-ID: <42e2of$[e-mail]>
References: <41m7tm$[e-mail]> <[e-mail]><42561p$[e-mail]>
NNTP-Posting-Host: pipe2.nyc.pipeline.com

Get a "junk box" 3,579.5KHz colorburst crystal. Make an oscillator using a
9v battery. Connect a 3ft piece of wire to an RF hot-spot on the ckt and
run it down your pant leg. If they notice the TV goes wacky evertime you
enter the room they will put you in charge of the fridge detail in the
kitchen during playtime.
p.s. With the colors going wacky and after a few buds both teams will look
the same and you'll just enjoy the pretty colors. As an alternate you can
become MR. POULARITY in your neighborhood by calling CQ on CW at full legal
limit
during the last quarter on that 80mtr frequency!
--
Anthony G. Catalano WW2W ham op

"We should have controlls on certain forms of speach" - Dianne Feinstein
(how liberating)


From [e-mail] Thu Sep 07 16:51:38 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!van-bc!vanbc.wimsey.com!news.rmii.com!newsjunkie.ans.net!pipeline!not-for-mail
From: [e-mail] (Anthony G. Catalano)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to make fox hunt target?
Date: 4 Sep 1995 01:50:45 -0400
Organization: The Pipeline
Lines: 18
Message-ID: <42e43l$[e-mail]>
References: <41vcos$[e-mail]><mmusick-3108951113210001@198.102.74.50>
NNTP-Posting-Host: pipe2.nyc.pipeline.com

I built one that keyed the ht and sent CW tones into the audio mic line.
The keyer can ID my call only as it is diode programmed. A better way is
simply to use a 555 chip for the key timing and the new vioce recording
chip now carried by Radio Shack. you ca get up to 20 seconds of audio. I
was thinking of making a simpex repeater with 2 or 3 of them cascaded. You
can record a taunting audio message to all those wandering plebes! I place
my "bunny" in a military shell box, painted it camoflauge and had drilled a
small hole for a BNC connector onto which I made a thin stiff wire antenna
painted black with some twigs and leaves twisted around it taken from the
spot where it was hidden. It was in a bush "protected" by a catapillar nest
off in a god-forsaken corner in Floyd Bennet Air Field in Brooklyn. It was
found after 2 hours. If you can take advantage of a radio's HI/LO setting
by keying that randomly too. You can also mess up those phase sensitive
arrays by horizontally polarizing the signal. Placing a hidden wire
reflector or director neaby can also "tax" one's expertise in such an
effort. Have no mercy let them suffer.
--
Anthony G. Catalano WW2W (the BUNNY) ham op


From [e-mail] Thu Sep 07 16:51:39 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!tcsi.tcs.com!agate!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Quad Antenna Design Programs
Date: 4 Sep 95 04:40:39 GMT
Organization: ucsd usenet gateway
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


    Hello, Folks:

    I'm looking  for a  program, preferably  either PD/Freeware or Shareware,
  that will do Quad antenna design and modeling similar to what Yagi Max does
  for a Yagi antenna.

    I have played with MiniNEC and a few others similar to that, but frankly,
  they are harder to use than doing the calculations by hand!

    Thanks for any help or info that you may be able to provide!

        Marty Albert -- KC6UFM
         Cherokee Pass, MO
         [e-mail]




From [e-mail] Thu Sep 07 16:51:41 1995
Path: grape.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cyberport.com!news.magick.net!gp.magick.net!not-for-mail
From: [e-mail] (Sean Smithers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics from Radio Shack
Date: 4 Sep 1995 17:16:58 GMT
Organization: Magick Net
Lines: 143
Message-ID: <42fcaa$[e-mail]>
References: <41na2e$[e-mail]>
NNTP-Posting-Host: gp.magick.net
X-Newsreader: TIN [UNIX 1.3 941216BETA PL0]

james P. Meyer ([e-mail]) wrote:

:       Before I spend money on something that may not be what I need, I'll
: ask for some advise.

:       I've got a used R-S DX-440 that seems to be a bit low in sensitivity
: on almost all the AM bands including all the SW bands.  I could test
: and probably fix whatever's wrong if I could get decent schematics.
: Is whatever service manual I might be able to get from R-S going to be
: halfway decent as far as showing me a full schematic with parts
: values?  If so, what's the R-S part number for the manual?

: Jim "no sig" Meyer

Subject: Re: Static Killer
Message-ID: <[e-mail]>
In-reply-to: [e-mail]'s message of Thu, 5 Jan 1995 00:48:54 GMT
Lines: 109
Nntp-Posting-Host: willow021
Organization: Cray Research, Inc.
References: <[e-mail]>
Date: 5 Jan 95 12:07:04 CST

Art Burke writes:

   Several messages back, someone posted information relating to a MOSFET
   on one of the boards in the Radio Shack DX series shortwave radios.
   I have a Sangean 803 or 803a, the one without narrow/wide, etc. It, too
   has become 'deaf.' Could the person who posted the 'fix' either re-post
   it or e-mail the info to me? Thanks.

Following are excerpts from my info file on this model.  Write me if
you'd like the whole file.

Chris

-----------------------------------------------------------------------


                        ANTENNAS AND STATIC ZAPPING

From: [e-mail] (Tim Deady)

     I found that the only thing that had been fried was a Field-Effect
Transistor labaled Q1 [See next note.  Ed.] on the circuit board (this
is in a DX-390/Sangean 818 mind you, other models could be different).
I replaced this with an MPF102 FET that I bought at Radio Shack for $.99
(Cat. No. 276-2062) and my radio has been working fine ever since.


From: [e-mail] (Mike Stine)

Your message mentioned zapping the front end of the Sangean The front end
of the Sangean 803A/DX-440 has a FET which will blow.  Its Q115.  Radio
Shack used to sell the part which you can use as a replacement, its MPF102
and sells for 79 cents (US).

-------------------------------------------------------------------------

WARNING! Some receivers (Sangean, early Sonys, etc) do not have overload
protection for reasonable voltage transients on external antennas! Put
back-to-back diodes in parallel between the external antenna lug and the
external ground lug on the radio. Most any silicon diodes will do. Then
your front end FET won't burn out as easily next time. (This includes
damage from static electricity when you touch the antenna terminals in the
dry wintertime.)

-------------------------------------------------------------------------

From: [e-mail] ( Joseph Feng )

>is there any way to prevent the damage in the first place?

I would use the technique that is described for the Sony 2010:  put a
couple of paralleled back-to-back diodes between the antenna lead and
the circuit ground(usually the same as the negative battery terminal).
This method has a wide applicability beyond just RF front ends.

Suggested diodes are 1N914/1N4148, available almost anywhere including
Radio Shack.  The circuit can be found in the 2010 mods that get posted
occasionally.  I have no evidence that it works for Sangean radios,
although the principle is well-known.


    Antenna  ----------------------------------------------- Radio Antenna
                        |              |                       input
                        |              |
                        |              |
                      -----           \ /
                       / \           -----
                        |              |
                        |              |
                        |              |
    Ground   ----------------------------------------------- Radio ground
                                                        ( usually the power
                                                          bus connected to
                                                          the negative
                                                          battery
                                                          terminal )

-----------------------------------------------------------------------

From: [e-mail] (Zack Lau (KH6CP))

Perhaps the most cost effective solution is to ground the antenna through a
high value resistor, perhaps 470 ohms to 10,000 ohms.  This will drain
the charge while not noticeably degrading reception.  The resistor
wattage isn't important, 1/4 watt is a common value.  A 1000 ohm 1/4 watt
resistor might be a good value to ask for.

Basically, static electricity accumulates on the antenna, and it discharges
through the FET.  The resistor drains the charge, preventing the voltage
from building up.


From: [e-mail] (charles mikelson)

I took it to a local Dealer , who said "I was lucky it wasn't worse"
as it turned out it was easy to fix:
Just remove the batteries until all capacitors discharged I haven't had
any problems since.


From: [e-mail] (Peter Whisker)

I posted an article a week ago about how I thought my DX-440 had been
zapped.  Thankfully, when I opened it up, all that had happened was that
the wire had become detached from the whip antennna. Phew!  All is now
happy again!

--

Chris Brewster                            Cray Research, Inc.


Hope this is what you need.

--
=============================================================================
Sean Smithers
Internet:   [e-mail]
CompuServe: 70132,136
Packet:     N7ZWU @ WB7VMS.#MURPH.OR.USA.NOAM


From [e-mail] Thu Sep 07 16:51:42 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!ftpbox!mothost!newdelph.cig.mot.com!oribi!sherwood
From: [e-mail] (Charles A. Sherwood)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FSK Demodulator schematic?
Date: 4 Sep 1995 18:24:52 GMT
Organization: Motorola Inc., Cellular Infrastructure Group
Lines: 22
Message-ID: <42fg9k$[e-mail]>
References: <42ajmt$[e-mail]> <42barf$[e-mail]>
NNTP-Posting-Host: oribi.rtsg.mot.com

>>The EXAR XR2211 demodulator chip is just the thing!
>>I have designed around it and it will work upto 2400 baud on
>>VHF,  300 Baud on HF.  Some of the MFJ decoder also used this chip
>>
>anxious to get it hooked up with the hf station.  It seems there could be
>some software for the soundblaster thingy to allow one to maybe demodulate
>RTTY and SSTV.  Whaddaya think?

I have been brousing through the Amsoft CD rom and there is shareware
on there for using a sound blaster card. Also there is software on there
to receive various digital modes(even pactor, I think). It requires an
external demodulator. Maybe that would be just what you guys are looking for.
Let me know if you need more details; I cant write this and look at the CD
rom at the same time.

chuck sherwood N9QZT
[e-mail]

--
Chuck Sherwood
[e-mail]
708-632-7078


From [e-mail] Thu Sep 07 16:51:43 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.iadfw.net!usenet
From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1500B push-pull amplifer.
Date: Mon, 04 Sep 1995 21:47:28 GMT
Organization: Internet America
Lines: 21
Message-ID: <42fm2a$[e-mail]>
References: <424ds7$[e-mail]> <424o0d$[e-mail]>
NNTP-Posting-Host: dal01-05.ppp.iadfw.net
X-Newsreader: Forte Free Agent v0.55

>Push pull operation

Call me soft hearted, Tom.  But the thought of anyone spending time to
build up a pair of 4CX1000'a in push-pull and then watching the
fireworks when they turn them on was just too cruel to allow.  Got me
to thinking about an old Gates rig: the FM-5B.  Had a pair of 6076's
in push-pull.  The tubes didn't have much gain at VHF so it wasn't too
awful.  So they took the same idea and put a pair of 4CX15000's in
push pull.  Called it the FM-20B.  Oscillated wonderfully on 27 MHz.
And every time it did the repair bill was about two thousand bucks.
The rig used screen neutralization with bread cutters in parallel with
each screen bypass.  When it oscillated the RF current in the screen
circuit would be so high it would turn the aluminum plates on the caps
soft and, over time, they would bend over into each other.

Who was that kid over in Cleveland with the pair of oscillating
4-1000's that had a Nike missle target-acquisition radar shut down?
K8RRR?

Fred



From [e-mail] Thu Sep 07 16:51:44 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!news.trw.com!gatekeeper.svl.trw.com!root
From: [e-mail] (ron bardarson)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Re: Ultra-miniature Direction-finding Unit
Date: 4 Sep 1995 21:49:48 GMT
Organization: TRW ASG
Lines: 19
Message-ID: <42fs9s$[e-mail]>
References: <cjg007-2604951238200001@145.1.90.177> <[e-mail]> <[e-mail]> <42c7f3$[e-mail]>
NNTP-Posting-Host: lenin.svl.trw.com
Xref: grape.epix.net sci.electronics:142415 rec.radio.amateur.homebrew:9343 rec.radio.amateur.antenna:13631 rec.radio.amateur.misc:86059

In article <42c7f3$[e-mail]>,
Anderson @ Mpower <[e-mail]> wrote:
>On behalf of Martin Landeros ([e-mail]), who wrote:
>
>
>: On Thu, 27 Apr 1995, Mark Kinsler wrote:
>
>: > >I've always thought it would be great if one could make a really small
>: > >direction-finding unit that would be the size of a small calculator,
>: > >including the antenna (something like James Bond would use).  I'm curious
>
>Are you discussing direction, as in Lat/Lon, or are you discussing
>RFemission direction, which I happen to be interested in ?

What interest do you have?  It's a specialty here.  Small DF units
exist, it's primarily a price-performance issue.

--
#include <std.dsclmr>  [e-mail]


From [e-mail] Thu Sep 07 16:51:45 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: transistor replacement
Date: Mon, 04 Sep 95 22:25:44 GMT
Lines: 24
Message-ID: <[e-mail]>
References: <42f53e$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <42f53e$[e-mail]>, [e-mail] (ed guinn) wrote:

>I have an ft101ex and I am working on the now deaf reciever. I found
>that q2 on the IF board is dead. The manual calls for a 2SC784r. What
>is an easy to find replacement  for that transistor.

Larger audio/video service companies stock numbers like that.  They
buy them from companies like MCM Electronics and Consolidated
Electronics (CEI).  These are Japanese numbers, and both the 2SC784
and 2SK19 (fet) are very common.  The 2SK19, in fact, was used in
thousands and thousands of stereos as a good low-noise device for FM
front ends.

Reputable shops don't substitute these parts, they use identical
Japanese numbers, or worst case, Japanese replacements.  MCM and CEI
also sell data books covering 2SA, 2SB, 2SC, 2SD, 2SK and 3SK (mosfet)
devices.  The same shop that stocks the transistors should have a
copy of those books to look up devices.  If they don't, you're in the
wrong place.

73,

Jack  WB3U


From [e-mail] Thu Sep 07 16:51:46 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news2.near.net!news.delphi.com!usenet
From: John Shuster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP KIT pse help me out!
Date: Tue, 5 Sep 95 01:37:19 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: bos1e.delphi.com
X-To: <[e-mail]>

For a good low cost high quality kit, write to:
Oak Hills Research
20879 Madison St.
Big Rapids, MI  49307

Ask for a copy of their catalogue.

You can get their Sprint II on sale now for $80.

John


From [e-mail] Thu Sep 07 16:51:47 1995
Path: grape.epix.net!news.sprintlink.net!EU.net!dkuug!Norway.EU.net!scimitar!it
From: [e-mail] (Ivan Tving)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: How to design antenna for 48MHz
Date: 5 Sep 1995 08:51:48 GMT
Organization: Dolphin Interconnect Solutions
Lines: 27
Sender: it@scimitar (Ivan Tving)
Distribution: world
Message-ID: <42h334$[e-mail]>
NNTP-Posting-Host: scimitar.dolphinics.no
Xref: grape.epix.net rec.radio.amateur.homebrew:9358 rec.radio.amateur.antenna:13646

How do one build a mono-pole antenna shorter that lambda/4 that has a
75ohms impedance matching?

I need an antenna for portable equipment that transmits and receives at
approx. 48MHz. It is inconvenient to use a dipole and it shouldn't be
longer than 10" (25cm).

If I put a coil in series with the antenna, it should be possible to
compensate for the shorter length. How do I determine the induction
of that coil?

Since it is not a dipole (and I can't use the earth as reflector) how
do I "emulate" the second half of a dipole? Can a LC network between
signal ground and the base of the antenna do the trick? How do I calculate
the LC values?

That was a lot of questions. I'll appreciate all replies.

Thanks, Ivan Tving

==============================================================================
Ivan Tving, development engineer    | Tel:[phone], Fax:[phone]
Dolphin Interconnect Solutions AS   | Visiting Address: Olaf Helsets vei 6,
E-mail: [e-mail]            | P.O. Box 52 Bogerud, N-0621 Oslo, Norway
------------------------------------------------------------------------------
                    "It's not a job - it's an adventure"
==============================================================================


From [e-mail] Thu Sep 07 16:51:48 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (IBM Del F)
Newsgroups: rec.radio.amateur.homebrew
Subject: odd-ball IC chip
Date: 5 Sep 1995 14:54:58 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 12
Sender: [e-mail]
Message-ID: <42i6e2$[e-mail]>
Reply-To: [e-mail] (IBM Del F)
NNTP-Posting-Host: newsbf02.mail.aol.com

I'm looking for a replacement IC that is the control chip in a Sear garage
door opener.  The Texas Instrument ID on it is CX8544 (16-pin DIP).  It
took a lightning hit and it's got to be replaced.  The rest of the control
board checks out.  None of the usual parts houses lists it.  I'm thinking
it might be a special chip made to order for the real manufacturer of the
opener.

Any ideas on this one?

Thanks,
Del, KD4B
Raleigh, NC


From [e-mail] Thu Sep 07 16:51:49 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!tank.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!cri.ens-lyon.fr!news
From: [e-mail] (Frederic Tronel)
Newsgroups: rec.radio.amateur.homebrew
Subject: 1N21B or TH8121C
Date: 5 Sep 1995 17:51:00 GMT
Organization: Ecole Normale Superieure de Lyon, France
Lines: 13
Distribution: world
Message-ID: <42i2m4$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: gerland.ens-lyon.fr

Hello,


I need informations about diodes 1N21B or TH8121C.
I only know that they could be used in microwave applications.

Please e-mail : [e-mail]

Frederic
F1SDZ





From [e-mail] Thu Sep 07 16:51:50 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Home-made low Ohm resistors
Date: 5 Sep 1995 17:58:53 GMT
Organization: Hewlett-Packard
Lines: 14
Message-ID: <42i34t$[e-mail]>
References: <420boq$[e-mail]> <42314g$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

>Use Nichrome (Nickel/Chromium) alloy wire. It is a fairly high resistance wire
>(don't remember the ohms/ft) used for winding resistors and heating elements.

>One problem is you cannot solder to it. Screw the ends to a barrier strip.
>Joe - AA3GN

A better choice is Manganin wire.  You *can* solder to it, and it has a very
low temperature coefficient of resistance.  It is almost as high resistance
as Nichrome.

Manganin wire is available from Lakeshore, ([e-mail])

Rick Karlquist N6RK
[e-mail]


From [e-mail] Thu Sep 07 16:51:51 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!lll-winken.llnl.gov!taurus.cs.nps.navy.mil!pcmks.ece.nps.navy.mil!shields
From: [e-mail] (Michael K. Shields)
Subject: Re: Ramsey Kits
Message-ID: <[e-mail]>
Lines: 26
Sender: [e-mail]
Organization: Naval Postgraduate School, Monterey
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1]
References: <42f5d5$[e-mail]> <42fbs1$[e-mail]>
Date: Tue, 5 Sep 1995 23:27:28 GMT

>In article <42f5d5$[e-mail]>, [e-mail] says...
>>
>>Has anyone built any of the QRP transmitter kits by Ramsey?  Are they
>>mostly just for the fun of building or do they actually perform
>>reasonably well?  If the adage "you get what you pay for" applies, then
>>I wouldn't expect much performance for just $30.
>>
>>Tom Snyder  [e-mail]

I teach a communications class for graduate students in management curriculums
here at NPS. I require a class project and one of the options is for the
students to get a no code tech license and build a kit. Many of the students
(who have never seen a resistor, etc.) choose to build Ramsey kits and over
the past three years I have seen about 50 FM stereo transmitters and 2m and 6m
transmitters and receivers. The students have always been able to get them to
work and their complaints, if any, are that there is a part or two missing
(Ramsey always sends the missing parts), and that they had trouble determining
what some of the componets were (I have had students ask how to tell which
lead is which on resistors, etc.).

Thus it is my opinion that anyone could build any of the Ramsey kits and
that they will work. The smarter and more experienced one is, the more
likely you are to want to modify and improve the kit, but they all seem to
work as specified.

Mike Shields


From [e-mail] Thu Sep 07 16:51:52 1995
Path: grape.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!spool.mu.edu!howland.reston.ans.net!newsjunkie.ans.net!news.rmii.com!thoth.nilenet.com!Default
From: [e-mail] (Dave Zachritz)
Newsgroups: alt.radio.college,alt.radio.pirate,alt.radio.talk,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Help with a phonetap! - phone.txt [01/01]
Date: 6 Sep 1995 04:46:21 GMT
Organization: Bizzell Productions
Lines: 34
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BEGIN -- Cut Here -- cut here
Path: thoth.nilenet.com!Default
From: [e-mail] (Dave Zachritz)
Newsgroups: rec.radio,rec.radio.broadcasting,rec.radio.amateur,rec.radio.amateur.equipment
Subject: Phonetap on a BE 150A
Date: 5 Sep 1995 19:00:36 GMT
Organization: Bizzell Productions
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Status: N

I am trying to build a phone tap for my school's station.  We can get the
caller's voice onto one channel, and we can send signal from the board to the
phone, but we can't do it simultaneously.
Basically what I want to do is send the audition channel to the telephone.  To
 what will I connect the output of the audition channel?
Also, I want to use the phone line to send voice to the board over the phone
line.  Since phone mic's suck, I want to connect a Shure SM-58 to a telephone.
 I have tried, but I can't get any signal to go through.  Do I need some form
of amplification?
Any help you can give would be most appreciated either by posting to the group
or by sending me email to [e-mail]

Thanks very much,

David Zachritz
General Manager
KRCX - Regis University
Denver, Colorado
1490AM
END -- Cut Here -- cut here


From [e-mail] Thu Sep 07 16:51:53 1995
Path: grape.epix.net!news.sprintlink.net!maya.pfi.net!news.admu.edu.ph!910256
From: [e-mail] (Diaz. Manuel O. Jr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF Radio Transmitter: MAKING ONE
Date: 6 Sep 1995 05:18:32 GMT
Organization: Ateneo de Manila University
Lines: 8
Message-ID: <42jav8$[e-mail]>
NNTP-Posting-Host: penoy.admu.edu.ph
X-Newsreader: TIN [version 1.2 PL2]


Can somebody help me out with how to make a home-made
vhf radio transceiver? I'd like schematics, if possible.
Manuals, references, etc., are most welcome.

Please email me at: [e-mail]
********************************************************



From [e-mail] Thu Sep 07 16:51:54 1995
Path: grape.epix.net!news.sprintlink.net!news.gate.net!hopi.gate.net!ghudson
From: Grant Hudson <[e-mail]>
Newsgroups: alt.radio.college,alt.radio.pirate,alt.radio.talk,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Help with a phonetap! - phone.txt [01/01]
Date: Wed, 6 Sep 1995 09:41:51 -0400
Lines: 13
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References: <42j92t$[e-mail]>
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Audition or Program channel doesn't matter.  You'll need to buy ( or
build the equivelant of) a phone hybrid.

You need to come up with mix-minus audio to feed back down the phone
line.

On 6 Sep 1995, Dave Zachritz wrote:

>
> I am trying to build a phone tap for my school's station.  We can get the
> caller's voice onto one channel, and we can send signal from the board to the
> phone, but we can't do it simultaneously.
>


From [e-mail] Thu Sep 07 16:51:55 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!eskimo!localhost
From: [e-mail] (Bill Turner)
Subject: Re: Ramsey Kits
X-Nntp-Posting-Host: tia1.eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
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References: <42f5d5$[e-mail]> <42fbs1$[e-mail]>
Date: Wed, 6 Sep 1995 09:57:54 GMT
Lines: 7

I stopped buying Ramsey kits when I saw a design which had a bypass
capacitor directly from the output of an op amp to ground.  Every
first-semester electronics student knows better than that.


73, Bill W7LZP
[e-mail]


From [e-mail] Thu Sep 07 16:51:56 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!simtel!swidir.switch.ch!CERN.ch!sp056!bohl
From: [e-mail] (Thomas Bohl)
Subject: Search spare part for wide band amplifier ZHL-1042J
X-Nntp-Posting-Host: sp056.cern.ch
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Date: Wed, 6 Sep 1995 10:21:15 GMT
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   Dear colleagues,

   does anybody know what type of transistor is used in the final
   stage of the Mini Circuits wideband amplifier ZHL-1042-J ?

   Mini Circuits does not make spare parts available for this
   amplifier. A new amplifier costs about USD 500.

   Until now I just got one useful info. It was Mike, KD4QDM, who
   told me that the transistor is probably a GaAs FET from Avantek.

   Does anybody know more ?

   73 de Thomas, F5SWE
   [e-mail]




From [e-mail] Thu Sep 07 16:51:57 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!usenet.eel.ufl.edu!psgrain!news.tek.com!gazette!not-for-mail
From: [e-mail] (Ed Burress)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for Don Johnson book............
Date: 6 Sep 1995 11:29:03 -0700
Organization: Tektronix, Inc., Wilsonville,  OR.
Lines: 18
Distribution: usa
Message-ID: <[e-mail]>
NNTP-Posting-Host: sepia.wv.tek.com

I'm looking for a book called
"40 years of HF mobileering" by Don Johnson.  I have tried
Ham Radio Outlet, Portland Radio Supply, Norvac Electronics,
Powells Technical Books, Old Tyme Radio Company, and The
ARRL. I also tried our County, and State library, no luck.

I am sure that this book is out of print, but since several
people have suggested it as a source of information, I have
reason to believe that it does exist.  It is the Radio
equivalent of searching for the Necronomichon (fictitious
book of spells and names of the dead).

Anyone know where I can find a copy?  I'm looking in particular
for plans to build a motorized tuneable HF mobile antenna.

Thanks,
Ed Burress
KC7GFX


From [e-mail] Thu Sep 07 16:51:59 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] (ITUTec)
Newsgroups: rec.radio.amateur.homebrew
Subject: PIC Programmers starting at only $29!
Date: 6 Sep 1995 14:52:51 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 82
Sender: [e-mail]
Message-ID: <42kqm3$[e-mail]>
Reply-To: [e-mail] (ITUTec)
NNTP-Posting-Host: newsbf02.mail.aol.com


ITU Technologies is proud to introduce the ITU PIC Programmer Model
PIC-1, the first truly low-cost and versatile programmer for the
Microchip Family of PIC microcontrollers.  This programmer is designed
for programming Microchip's popular PIC16C6x/7x/8x family of
microcontrollers.  The programmer is approximately 3.3" x 3.7" in size
and features a built-in 18 pin DIP socket and an expansion header.  The
expansion header is provided for programming adapters and in-system
programming of EEPROM-based PICs.  A variety of adapters will also be
available to support 28/40 pin DIP PICs and other packaging forms.  The
PIC-1 programmer comes complete with an interfacing cable to connect to
your PC parallel port, programming software, and power supply.  The
included power supply is for US use only, foreign customers must provide
their own converter/power supply.

The programming software included is designed to program all of the
supported PICs mentioned above.  Software updates will be available
electronically free of charge.  The software allows programming of the
PICs program memory, setting of configuration fuses, program
verification and the ability to read PIC memory to a file.  The software
also allows data memory programming, reading of data memory, and bulk
erase of EEPROM-based PICs.  The software is DOS-based and is Windows95
compatible.

An UNREGISTERED shareware version of Don Lekei's Macro+ Assembler for
Microchip PIC Microcontrollers (ASPIC) is included with each programmer
for your evaluation.

SPECIAL INTRODUCTORY PRICING FOR INTERNET CUSTOMERS
For a limited time, this special introductory pricing is available:

ITU PIC Programmer (Model PIC-1)        KIT $29
This kit includes:
* an easy to follow instruction manual for building your programmer
* a high quality printed circuit board with silkscreen
* all components needed to build the programmer
* PIC Programming Software for IBM PC AT-compatible Computers
* a cable to connect the programmer to a PC's parallel port
* a power supply for the programmer (for US use)
* a User's manual introducing the PIC-1 programmer and software

ITU PIC Programmer (Model PIC-1)        Assembled/Tested $49
As above, but assembled and tested.

ALSO AVAILABLE PIC-N-GO PACKAGES:

PIC-N-GO packages are designed for the microcontroller novice.  They
include the ITU PIC Programmer Model PIC-1, as above, plus a
PIC16C84-04/P microcontroller.  This EEPROM-based microcontroller is
ideal for the novice and the PIC-N-GO packages are the most attractive
programmers available for the beginner.  You can program and erase the
PIC16C84 many times without the use of an EPROM eraser, making it the
best choice for those starting out with microcontrollers.  These packages
are great for students and hobbyists looking to acquaint themselves with
microcontrollers.

PIC-N-GO KIT only $39
* includes PIC-1 programmer kit and PIC16C84-04/P microcontroller (w/
data sheet)

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* includes assembled and tested PIC-1 programmer and PIC16C84-04/P (w/
data sheet)

Quantity discounts are available, making these packages the perfect
choice for schools and clubs wishing to teach introductory
microcontroller usage.

All products include a 30-day money back guarantee and a 90-day
warranty.  Due to the nature of kit building, all kits must be returned
unassembled to qualify for a full refund.

Please e-mail us at [e-mail] with your questions or if you would
like ordering information.  Also, see our World-Wide Web page at
http://www.iglou.com/itu for more product information!


-----------------------------------------------------------------------
ITU Technologies
e-mail: [e-mail]
http://www.iglou.com/itu    ftp://iglou.com/members/ITU
PIC programmers starting at $29!


From [e-mail] Thu Sep 07 16:52:00 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!in1.uu.net!news1.digital.com!decwrl!tribune.usask.ca!news.sasknet.sk.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03
From: VE4KLM <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for old QST articles
Date: Wed, 6 Sep 1995 15:24:30 -0500
Organization: The University of Manitoba
Lines: 48
Message-ID: <[e-mail]>
NNTP-Posting-Host: access.mbnet.mb.ca
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


I am looking for several articles in old QST magazines that are no longer
available at any of the local libraries here. Most of the libraries only
catalogue articles back to 5 years ago on micro film. After that you are
on your own.

If any one can help me, I would like the following articles :

 QST Apr 1959, "An inside picture of Directional Wattmeters", W. Bruene

 QST Jul 1973, "A simple computing SWR meter", D. Fayman

 QST Oct 1956, "The Monimatch", L. McCoy

 Ham Radio Aug 1979, "Broadband Power Tracking VSWR Bridge", H. Perras

 Ham Radio May 1980, "Automatic VSWR and Power Meter", V. Leenerts

Also, I find that alot of schematics and articles only deal with HF, how
about anything regarding VHF VSWR measurments ?

You can fax (if you don't mind) any articles to the following fax number
where I work :

        204 783 8286

If you can scan the article (GIF or JPG) that would be even better since we
have the UNIX version of XV at our disposal.

I hope some one can help me here. Thanks.

  ---------------------------------------------------------------------------

                                Regards from

    |_       |_  |_|_|_|_  |_          |_    |_   |_        |_        |_
    |_       |_  |_        |_    |_    |_   |_    |_        |_|_    |_|_
    |_       |_  |_        |_    |_    |_  |_     |_        |_ |_  |_ |_
     |_     |_   |_|_|_    |_|_|_|_|_  |_|_       |_        |_  |_|_  |_
      |_   |_    |_              |_    |_  |_     |_        |_   |_   |_
       |_ |_     |_              |_    |_   |_    |_        |_        |_
        |_       |_|_|_|_        |_    |_    |_   |_|_|_|_  |_        |_

          -----------------------------------------------------
           Maiko Langelaar, VE4KLM, Winnipeg, Manitoba, Canada
            Winnipeg ARES Group, Basic + 5 WPM, Software Eng.
                 Internet Address : [e-mail]
                ----------------------------------------


From [e-mail] Thu Sep 07 16:52:01 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.misc
Subject: Re: Change WBFM to NBFM????
Date: 6 Sep 1995 15:49:58 GMT
Organization: UniSQL, Inc.
Lines: 26
Message-ID: <42kfv6$[e-mail]>
References: 29vje$[e-mail]> <42e0s3$[e-mail]> <42e92l$[e-mail]> <42ht1a$[e-mail]> <42it32$[e-mail]>
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Xref: grape.epix.net rec.radio.amateur.homebrew:9352 rec.radio.amateur.equipment:16682 rec.radio.amateur.misc:86082

In my defense, I suggested a 0.02 fix on a $20. rig.

If you want a 25-year-old military surplus rig to work like a $900 1995
rig, you can do it.  But it's going to cost more than $900 if you figure
your time as worth more than minimum wage.

A speech processor (properly adjusted) is useful on any rig.  There's no
telling what condition the existing audio shaping circuitry is in on a
surplus rig that's old enough to vote.  Getting the deviation down to where
the rig can be heard and understood on the air is the first step.  Better
receiver filtering is esssential as well -- but you can buy a superior
one-chip FM receiver from Moto for $3.   Do you want to go through a
varnish-laden IF chain to get a couple more dB when you can go to Radio
Shack and buy 20 dB and a hamburger for $5?

I am a strong proponent of CHEAP test lash-ups that provide a go/no-go initial
test on surplus gear.  It saddens me when people spend hundreds of dollars
testing and tweaking a tin-can radio when they could have put a nickel bandaid
on it, had some fun, and put the money toward a nice rig -- either a modern
rig or a classic that's worth the time and money.

BTW, is there any place in the country where there's enough 6 meter traffic
for adjacent-channel rejection to be a factor?

Jim N6OTQ



From [e-mail] Thu Sep 07 16:52:02 1995
Path: grape.epix.net!news.sprintlink.net!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What type of capacitor is this ???????
Date: 6 Sep 1995 16:50:16 GMT
Organization: ELNEC/EZNEC Software
Lines: 26
Message-ID: <42kjg8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-pdx09-03.teleport.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)

;   [e-mail] (Dave Kirkby) writes:
;
;  I've a circuit diagram that specifies a type DM-15, 500pF, 500V silver-mica
;  capacitor. Anyone know what a type DM-15 is ????? More to the point, where
;  can I get them from - preferably in the UK, but a foreign source will do,
;  if I cant get them here.
;
;  The circuit specifies a lead length (1/4") to use on these caps to resonate at
;  144MHz, so substituting any old 500V, 500pF silver-mica cap may not be wise.
;
;  davek G8WRB.

As I recall (he said in a geezerly voice), the DM15 was one of the rectangular
jobs with the dots for color code. There were several sizes of the things, and
I suppose but don't know that the DM15 was one specific size. Haven't seen one
in a coon's age, and would be surprised if you could still buy one.

Should be pretty easy to set up a test fixture with an HT and diode detector
to test for resonance. I'd guess you'd end up with leads just a bit longer
than 1/4" on a more modern, physically smaller capacitor if 1/4" was right
with the DM15.

73,
Roy Lewallen, W7EL




From [e-mail] Thu Sep 07 16:52:03 1995
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hpscit.sc.hp.com!icon!greg
From: [e-mail] (Greg Dolkas)
Subject: Re: DJ580T mod question
Sender: [e-mail] (News Administrator)
Message-ID: <[e-mail]>
Date: Wed, 6 Sep 1995 17:15:50 GMT
References: <428a5o$[e-mail]>
Organization: HP - Information Networks Division
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Xref: grape.epix.net rec.radio.amateur.misc:86084 rec.radio.amateur.homebrew:9353

Gerald Phillips ([e-mail]) wrote:
: I am atempting to do the extended receive mod. on my DJ580T.  I know
: that you are supposed to cut the red wire, but I want to make sure
: which wire you cut.  With the unit's display facing up and the bottom
: removed you can see a "red" loop wire that is about the same size as
: the blue one, and then there is a small "orange/red" wire at the top.
: I believe I cut the larger loop which is red and not the smaller loop
: that is orange/red.  If anyone can clear this up for me I would greatly
: appreciate it.  Thanks and 73.
:
: KE4MBD - Travis

Yes, the right wire is the thicker, red wire.  The skinnier orange-ish wire
loop goes to the microphone.  Don't ask me how I know this... :-).

Greg  KO6TH


From [e-mail] Thu Sep 07 16:52:04 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!tank.news.pipex.net!pipex!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (LTLBOOZER)
Newsgroups: alt.radio.college,alt.radio.pirate,alt.radio.talk,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Help with a phonetap! - phone.txt [01/01]
Date: 6 Sep 1995 17:17:56 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <42l364$[e-mail]>
References: <42j92t$[e-mail]>
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Xref: grape.epix.net alt.radio.pirate:9942 rec.radio.amateur.homebrew:9349 rec.radio.amateur.misc:86066

They make Machines that do this. You can get annything from an expensive
telephone interface for your whole studio to a little black box from radio
shack.

It's just a little transformer and it does the job Beautifully.

           I've been to denver. Nice city but the air's too thin, I don't
trust any air I can't see.
()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()
Roman Bielski, Bklyn,NY 11209
[e-mail]

Tune in Every MONDAY Night to  | Let me be your immortal slave
*** 88.7 fm WRHU  ***                 | and WHIP ME!!
WHIPLASH--Music heavy            | Teenage Rave
 enough to sink any Island.


From [e-mail] Thu Sep 07 16:52:05 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news1.digital.com!nntp-hub2.barrnet.net!pacbell.com!dmturne
From: [e-mail] (Dave Turner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What type of capacitor is this ???????
Date: 6 Sep 1995 17:55:03 GMT
Organization: Pacific Bell
Lines: 17
Message-ID: <42kn9n$[e-mail]>
References: <[e-mail]> <42kjg8$[e-mail]>
NNTP-Posting-Host: stdin
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit


In article <42kjg8$[e-mail]> [e-mail] (Roy Lewallen) writes:
>;  I've a circuit diagram that specifies a type DM-15, 500pF, 500V silver-mica
>;  capacitor. Anyone know what a type DM-15 is ????? More to the point, where
>
>As I recall (he said in a geezerly voice), the DM15 was one of the rectangular
>jobs with the dots for color code. There were several sizes of the things, and
>I suppose but don't know that the DM15 was one specific size. Haven't seen one
>in a coon's age, and would be surprised if you could still buy one.
>

A DM-15 is a Dipped Mica (size 15); they use printed value numbers
(eg NNX: NN first two digits, X number of zeros).

Jameco, Circuit Specialists and many others still sell them.

--
Dave Turner     [phone]  [e-mail]


From [e-mail] Thu Sep 07 16:52:07 1995
Path: grape.epix.net!news.sprintlink.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!vixen.cso.uiuc.edu!usenet
From: "Charles J. Hawley Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Don Johnson book............
Date: 6 Sep 1995 21:12:40 GMT
Organization: University of Illinois
Lines: 34
Message-ID: <42l2s8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: berlin-5.slip.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

[e-mail] (Ed Burress) wrote:
>I'm looking for a book called
>"40 years of HF mobileering" by Don Johnson.  I have tried
>Ham Radio Outlet, Portland Radio Supply, Norvac Electronics,
>Powells Technical Books, Old Tyme Radio Company, and The
>ARRL. I also tried our County, and State library, no luck.
>
>I am sure that this book is out of print, but since several
>people have suggested it as a source of information, I have
>reason to believe that it does exist.  It is the Radio
>equivalent of searching for the Necronomichon (fictitious
>book of spells and names of the dead).
>
>Anyone know where I can find a copy?  I'm looking in particular
>for plans to build a motorized tuneable HF mobile antenna.
>
>Thanks,
>Ed Burress
>KC7GFX

As of Jan, 1993 Don Johnson could be reached at:
Box 595
26659 Capay Street
Esparto, CA  95267-0595
Although he is not in the antenna business, he sells a few parts and will
send you a printout of the construction details.
Maybe he has some books left. They have only been out about 2 years.
He doesn't give a phone # in the notes, but refers to phone calls
regarding construction problems. Maybe information gives it out.

Chuck
KE9UW
Urbana, Illinois



From [e-mail] Thu Sep 07 16:52:08 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Thomas Amoroso)
Newsgroups: rec.radio.amateur.homebrew
Subject: Oak Hills xcvr-not receiving?
Date: 6 Sep 1995 21:41:23 GMT
Organization: Netcom
Lines: 13
Message-ID: <42l4i3$[e-mail]>
NNTP-Posting-Host: ix-dc13-15.ix.netcom.com
X-NETCOM-Date: Wed Sep 06  2:41:23 PM PDT 1995

I have an Oak Hills QRP Explorer 80M kit built radio, and am having
trouble receiving any signal.  My Sony SWL radio gets good signal on
80M-ie W1AW code practice, which I need, but the Explorer is silent.
The factory says it is properly aligned (they did it-I don't have the
instrumentation) and working.  Do I need a true 80M antenna for
reception? (inasmuch as I don't right now) Would an antenna tuner help?
All replies appreciated-save bandwidth if possible and email to

[e-mail]

TNX ES 73'S

>Tom<


From [e-mail] Thu Sep 07 16:52:08 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!hp-cv!reuter.cse.ogi.edu!news.tek.com!gazette!not-for-mail
From: [e-mail] (Ed Burress)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Don Johnson book............
Date: 7 Sep 1995 09:54:50 -0700
Organization: Tektronix, Inc., Wilsonville,  OR.
Lines: 12
Distribution: usa
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sepia.wv.tek.com

I found a copy at the Radio Bookstore, $14.95 + shipping.  When I told
the guy on the phone what the title was, he finished the sentence before
I could...he knew the author, the publisher, the copyright date, etc.
If anyone is interested, they have a free 24 page catalog and a 1-800 number:
1-800-457-7373.  I have no relationship with them other than they were
able to sell me a copy of a book that the ARRL technical department, and
librarian didn't even know existed.

Thanks for all the replies.
73's
Ed Burress
KC7GFX


From [e-mail] Thu Sep 07 16:52:10 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!in2.uu.net!pipeline!psinntp!psinntp!psinntp!interramp.com!usenet
From: Grant Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solid state convesions.
Date: 7 Sep 1995 12:38:54 GMT
Organization: PSI Public Usenet Link
Lines: 30
Message-ID: <42mp4u$[e-mail]>
References: <42lj4v$[e-mail]>
NNTP-Posting-Host: ip239.dallas2.tx.interramp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

[e-mail] (PTracy) wrote:
>Well, lets see what this turns into.
>
>I have a great radio that I just won't unload, at least not yet.  It is a
>Drake B line, all tube.  I just haven't been all that satisfied with the
>reliability (real or perceived) of most of the Jap Crap on the market.
>

You're right on there!


>What I have been thinking of is this - I would like to convert some parts
>of this to solid state.  I would like to do this only because of the
>difficulty in obtaining tubes.

Actually, the tubes for the Drakes are still pretty much available.  As a fan of
vintage radios,  I have a station with about 250 tubes -- everything from metal to
hard-to-find transmitting types.  SO FAR -- everything I've needed has been
available from one of several off-the-shelf suppliers.  Of course, I also keep my
spares box inventory current, too -- more for quick repairs, but also as a hedge
against availability.  With as many Drake A,B,C lines out there seeing day-in
day-out use, there doesn't seem to have been much of a problem yet ....

I have the feeling you'd be better off just building a solid state transmitter from
scratch -- but then, why would anyone even WANT to build a solid state transmitter

:-)  :-)

Grant/NQ5T



From [e-mail] Thu Sep 07 16:52:10 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!not-for-mail
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: HTX100 schem or transverter mods??
Date: 7 Sep 1995 13:35:18 -0500
Organization: UTexas Mail-to-News Gateway
Lines: 23
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: news.cs.utexas.edu
Xref: grape.epix.net rec.radio.amateur.equipment:16705 rec.radio.amateur.homebrew:9362

 [e-mail] (Joe Landis - Systems & Network Mgr) writes:

 -Hi,
 -Does anyone have a schematic for the Radio Shack HTX100 10 meter rig,
 -or has anyone added seperate low-level transmit and recieve?
 -I'd like to use mine for a 28mhz tunable if for a DEM 432 mhz IF
transverter.
 -
 -Thanks,
 -Joe - AA3GN

You can go to your "friendly" neighborhood Radio Shack store and
ask for a Service Manual for your HTX-100.  They cost around $15.
This is the book that is used by the service technician.
I think you can also call 1-800-THE-SHACK and order it on your
credit card.  It won't have anything about modifications but it has
a detailed schematic.  As far as the low level transmit you might
be able to modify the output section for low level output.
I guess you are looking for the milliwatt range.  It might be easier
to build a 30db attenuator.

Kevin, WB5RUE
[e-mail]


From [e-mail] Tue Sep 12 11:26:23 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone ever use that Mr. Beer thing?
Date: 9 Sep 1995 13:57:07 GMT
Organization: JP Accelerator Works, Inc.
Lines: 29
Message-ID: <42s6fj$[e-mail]>
References: <420ofn$[e-mail]> <42dn2v$[e-mail]> <42r2nf$[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

[e-mail] (Gary P. Fiber) wrote:
>In article <42dn2v$[e-mail]>, [e-mail]   (Bill Newkirk) says:
>>
>>In <420ofn$[e-mail]>, [e-mail] (Paul M. Zeller) writes:
>>>I was browsing my television channels, as I tend to do from time to
>>>time, and noticed a thing called Mr. Beer on QVC 2.  Does anyone have
>>>any experience with this and is this worth it?  It appears to be
>>>cheaply put together.
>>
>>zounds! sounds like a visit to alt.beer is in order...
>>
>Are all of to young to remember " 807s ".  :)
>
>Gary
>
Well, I for one remember 807's.  Had a couple last night.

I also have a real 807 on a shelf above my Pentium to remind me where
this all started.  :-)

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

James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]




From [e-mail] Tue Sep 12 11:26:24 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PTracy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for CB schematic ***CB > 10M convertalble?***
Date: 9 Sep 1995 15:17:11 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
Message-ID: <42sp7n$[e-mail]>
References: <42sfbq$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

What I have is an old KRACO cb.  It is called "OUT-A-SIGHT" and the model
# is KCB-4060.  This is an under the seat / in trunk type of radio, with
channel selection, volume control, and squelch controls in the mic, with a
long cord connecting the mic to the radio.  It's really well built  built
unit!  Shielding, all metal housing, feedthru caps, well done.  Oh, it
works too.

What I would like to do is find a schematic for this radio to determine if
it is possible (I'm sure it is) and just how hard this would be to convert
10M.  I does have a PLL type synthesizer in it's own sheilded box.  I does
NOT look anything even remotely like the HY-GAIN type of radios that I'm
familiar with.  Being frugal, (or is that cheap?) I hesitate to buy a Sams
photofact for it.  It would be worth more than the radio.

Does anybody out there have a schematic / photofact for this unit?  If so,
please let me know.  I'll be happy to pay copying costs, postage, etc.....

Pat Tracy, KE1C


From [e-mail] Tue Sep 12 11:26:25 1995
Path: grape.epix.net!news.sprintlink.net!news.onramp.net!usenet
From: [e-mail]@
Newsgroups: comp.robotics.misc,sci.electronics,rec.radio.amateur.homebrew
Subject: Seeking Info on Short-Range (8-9 ft) RF Data Links
Date: 9 Sep 1995 18:13:31 GMT
Organization: On-Ramp; Individual Internet Connections; Dallas/Ft Worth/Houston, TX USA
Lines: 28
Distribution: world
Message-ID: <42slgb$[e-mail]>
Reply-To: [e-mail] (Jeff Rush)
NNTP-Posting-Host: dal21.onramp.net
X-Newsreader: IBM NewsReader/2 v1.2
Xref: grape.epix.net sci.electronics:142918 rec.radio.amateur.homebrew:9412

Can anyone direct me to an info source for short-range radio links used to
keep several robots in constant contact with a central computer, in a constrained
environment like a test maze?  Must be low-power and light-weight.

I've checked rec.radio.*, rec.radio.amateur.*, sci.electronics; and searched the
Web various ways.  I've been seeking such for a couple of years.  It seems there
are several FM transmitter ICs for Mr. Microphone/Karoke toys, not too many
simplified FM receiver chips and no one I've found that builds an FSK modem into
them.  It seems this problem crosses multiple disciplines so I've been unsure of the
best place to look.

I'm looking for a very low-cost approach to have a 9600-baud serial link between
non-line-of-sight but close-proximity points.  It seems such gadgets would be
useful for many different projects; radio-controlled cars, radio-mice, robots etc.

Originally I considered ultrasonics, which I don't think would be as reliable for
data transmission and just seems messy.  I'm also thinking of pulsed, dispersed IR
with many detectors mounted around the maze.  I need bi-directional, so the
maze would also have many ganged transmitters with a receiver on the robots.

I'm looking for something I can build rather than buy.  This is a pet project of mine
for several years and I've been hoping the technology would catch up and I would
find a two-chip solution that you just add a few discrete components to and go.

Have I overlooked an easy solution here?  Any help is greatly appreciated!

Jeff Rush
email: [e-mail]


From [e-mail] Tue Sep 12 11:26:26 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RMore30042)
Newsgroups: comp.robotics.misc,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Seeking Info on Short-Range (8-9 ft) RF Data Links
Date: 9 Sep 1995 22:56:51 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <42tk5j$[e-mail]>
References: <42slgb$[e-mail]>
Reply-To: [e-mail] (RMore30042)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: grape.epix.net sci.electronics:142932 rec.radio.amateur.homebrew:9415

In the 8 - 9 foot range you will find that infrared communications is far
superior.  It is a simple matter to use commonly available IR detectors
(they cost around $2.50) and LEDs to transmit serial data.  With checksums
and an ACK NAK protocol this can be very reliable and really inexpensive.


From [e-mail] Tue Sep 12 11:26:27 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] (PSKH)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need source of custom CERAMIC Filters for 240kHz
Date: 9 Sep 1995 23:27:59 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <42tlvv$[e-mail]>
References: <428jdt$[e-mail]>
Reply-To: [e-mail] (PSKH)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am having a hard time myself looking for SSB filters at 9.0 Mhz .

Incidentally, it may be possible to make simple 4 crystal 10 mHZ filters
usingh 4 crystals and 4 capacitors + 2 transformers, but the performance
will be  not in the
same league as a professional 9.0 Mhz 10 crystal filters .
I ts hould be fine for  CW or rough SSB though.



From [e-mail] Tue Sep 12 11:26:28 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!news.rmii.com!van-bc!news.mindlink.net!agate!newsxfer.itd.umich.edu!news.eecs.umich.edu!hideg.cc.nd.edu!user
From: [e-mail] (Steve Hideg)
Newsgroups: alt.radio.college,alt.radio.pirate,alt.radio.talk,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: PHONE TAP: YOU MEAN PHONE PATCH!
Date: Sun, 10 Sep 1995 00:02:35 -0500
Organization: .
Lines: 7
Message-ID: <[e-mail]>
References: <42j92t$[e-mail]> <42qejj$[e-mail]>
NNTP-Posting-Host: hideg.cc.nd.edu
Xref: grape.epix.net alt.radio.pirate:10002 rec.radio.amateur.homebrew:9416 rec.radio.amateur.misc:86264

In article <42qejj$[e-mail]>, Don Huff <[e-mail]> wrote:

> JUST A HAM RADIO TERMINOLOGY CLARIFICATION:  TELEPHONE INTERFACES  TO

<deletia>

I thought hp computers had lower-case letters in their character sets by now.


From [e-mail] Tue Sep 12 11:26:29 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Info wanted on Heath HX-1681 transmitter
Date: 10 Sep 1995 00:34:52 GMT
Organization: JP Accelerator Works, Inc.
Lines: 20
Message-ID: <42tbrc$[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 1.2N (Windows; I; 16bit)

I just purchased a shiny, new-looking Heath HX-1681 at an auction, cheap.
It is a transmitter for 80 through 10.  The final has a pair of tubes -
looked like 6146's but could be sweep tubes.  I didn't open it up that
far.  Can anyone tell me a bit more about it? specfications? vintage?
I'd also be interested in locating a schematic and/or manual for a fair
price.  It's also missing the power cable, an 11 pin "octal type", male
on one end, female on the other. (I don't know what else to call it, it
looks like an octal tube base, but with 11 pins.)

73 de K9GXC (Jim), licensed since 1956.

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

James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]




From [e-mail] Tue Sep 12 11:26:30 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!w8ji..tom
From: [e-mail] (W8JI  TOM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1500B push-pull am
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (W8JI  TOM)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
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ws.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Subject: Re: 4CX1500B push-pull amplifer.
Date: 9 Sep 1995 01:57:31 -0400
Message-ID: <42racb$[e-mail]>
In article <42o6ou$[e-mail]>, Wes Stewart
<[e-mail]> writes:

>
>"Care and Feeding" does suggest, however, that below the
self-neutralizing
>frequency, normal cross-neutralizing circuits apply. (para 5.6.1) It
mentions
>the series capacitor method for use above the self-neutralizing frequency
>in paragraph 5.6.2.  It goes on to say that if the tube is to be used
over
>a wide range of frequencies, then the capacitor should be user
adjustable.
>This reinforces my suggestion that this is a narrow-band solution. All of

>the above is in the case of tetrodes and pentodes, which I believe was
the
>subject of the discussion.
>
>

Hi Wes and Fred,

Not only does the amp have a restricted operating range, the designer has
to exceptionally careful that no spurious resonances occur. The screen
grid tuning circuits decrease isolation at other frequencies, and can
create problems with out of band stability.

All in all, I prefer conventional bridge or other broad band techniques,
and a tube that isn't operated near or above it's self neutralizing
frequency.

73 Tom

--- QScan/PCB v1.15b / 01-0228
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From [e-mail] Tue Sep 12 11:26:31 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!john.h..ferguson
From: [e-mail] (JOHN H  FERGUSON)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Don Johns
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (JOHN H  FERGUSON)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
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From: "John H. Ferguson" <[e-mail]>
Subject: Re: Looking for Don Johnson book............
Date: 9 Sep 1995 07:56:43 GMT
Message-ID: <42rhbr$[e-mail]>
The book '40 + 5 years of HF Mobileering' is available from Worldradio
Books, Sacramento, CA or Big DK Publishing Co. Esparto CA.

Hope this helps!

John (N1IPT)



--- QScan/PCB v1.15b / 01-0228
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From [e-mail] Tue Sep 12 11:26:32 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!don.huff
From: [e-mail] (DON HUFF)
Newsgroups: rec.radio.amateur.homebrew
Subject: PHONE TAP: YOU MEAN PHONE
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (DON HUFF)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
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From: Don Huff <[e-mail]>
Subject: PHONE TAP: YOU MEAN PHONE PATCH!
Date: 8 Sep 1995 22:03:31 GMT
Message-ID: <42qejj$[e-mail]>
misc:29162

JUST A HAM RADIO TERMINOLOGY CLARIFICATION:  TELEPHONE INTERFACES  TO
RIGS HAVE HISTORICALLY ALWAYS BEEN CALLED A "PHONE PATCH", NOT A "PHONE TAP".

"TAPPING" OF TELEPHONES HAS OFTEN BEEN DONE WITH A LINEMAN'S HANDSET,
CALLED A "BUTT-IN", WHICH CLIPS DIRECTLY ONTO THE LINE PAIR.

A TELEPHONE INTERFACE OR "PHONE PATCH" FOR A HAM RIG IS BEST DONE WITH A
TRANSFORMER -BASED HYBRID, WHICH IS EASILY HOMEBREWED.  DESIGNS FOR THESE HAVE
BEEN AROUND SINCE THE 50'S IN NUMEROUS HAM RADIO ARTICLES, INCLUDING QST.

GL ES 73,
          DON, W6JL


--- QScan/PCB v1.15b / 01-0228
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+--------------------------------------------------------------------------+
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From [e-mail] Tue Sep 12 11:26:33 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!evan.platt
From: [e-mail] (EVAN PLATT)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PHONE TAP: YOU MEAN P
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (EVAN PLATT)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 47


From: [e-mail] (Evan Platt)
Subject: Re: PHONE TAP: YOU MEAN PHONE PATCH!
Date: Fri, 08 Sep 1995 22:57:39 GMT
Message-ID: <42qhgi$[e-mail]>
misc:29169

Don Huff <[e-mail]> wrote:

>JUST A HAM RADIO TERMINOLOGY CLARIFICATION:  TELEPHONE INTERFACES  TO
>RIGS HAVE HISTORICALLY ALWAYS BEEN CALLED A "PHONE PATCH", NOT A "PHONE TAP".

>"TAPPING" OF TELEPHONES HAS OFTEN BEEN DONE WITH A LINEMAN'S HANDSET,
>CALLED A "BUTT-IN", WHICH CLIPS DIRECTLY ONTO THE LINE PAIR.

>A TELEPHONE INTERFACE OR "PHONE PATCH" FOR A HAM RIG IS BEST DONE WITH A
>TRANSFORMER -BASED HYBRID, WHICH IS EASILY HOMEBREWED.  DESIGNS FOR THESE
HAVE>BEEN AROUND SINCE THE 50'S IN NUMEROUS HAM RADIO ARTICLES, INCLUDING QST.

>GL ES 73,
>          DON, W6JL

Uh... no, read the article... he means phone tap. autopatch (where one
can make phone calls from a HT) is something different..


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+--------------------------------------------------------------------------+




From [e-mail] Tue Sep 12 11:26:35 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!amatuer.cross.link.repeat
From: [e-mail] (AMATUER CROSS LINK REPEAT)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DJ580T mod question
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (AMATUER CROSS LINK REPEAT)
X-Newsreader: PCBoard Version 15.22
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Lines: 43


From: [e-mail] (Amatuer Cross Link Repeater Assoc.)
Subject: Re: DJ580T mod question
Message-ID: <[e-mail]>
Date: Sat, 9 Sep 1995 02:19:06 GMT
Greg Dolkas ([e-mail]) wrote:
: Gerald Phillips ([e-mail]) wrote:
: : I am atempting to do the extended receive mod. on my DJ580T.  I know
: : that you are supposed to cut the red wire, but I want to make sure
: : which wire you cut.  With the unit's display facing up and the bottom
: : removed you can see a "red" loop wire that is about the same size as
: : the blue one, and then there is a small "orange/red" wire at the top.
: : I believe I cut the larger loop which is red and not the smaller loop
: : that is orange/red.  If anyone can clear this up for me I would greatly
: : appreciate it.  Thanks and 73.
: :
: : KE4MBD - Travis

: Yes, the right wire is the thicker, red wire.  The skinnier orange-ish wire
: loop goes to the microphone.  Don't ask me how I know this... :-).

: Greg  KO6TH

cut the blue wire and tx on those freqs


--
               The Amateur Cross Link Repeater Association.
                          Post Office Box 34446
                            Chicago, IL 60634
                              312.714.5411
       [e-mail]  http://pages.ripco.com:8080/~aclr/aclr.html

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From [e-mail] Tue Sep 12 11:26:36 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!gary.coffman
From: [e-mail] (GARY COFFMAN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PHONE TAP: YOU MEAN P
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (GARY COFFMAN)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 55


From: [e-mail] (Gary Coffman)
Subject: Re: PHONE TAP: YOU MEAN PHONE PATCH!
Message-ID: <[e-mail]>
Date: Sat, 9 Sep 1995 02:58:50 GMT
misc:29196

In article <42qhgi$[e-mail]> [e-mail] writes:
>Don Huff <[e-mail]> wrote:
>
>>JUST A HAM RADIO TERMINOLOGY CLARIFICATION:  TELEPHONE INTERFACES  TO
>>RIGS HAVE HISTORICALLY ALWAYS BEEN CALLED A "PHONE PATCH", NOT A "PHONE
TAP".>
>>"TAPPING" OF TELEPHONES HAS OFTEN BEEN DONE WITH A LINEMAN'S HANDSET,
>>CALLED A "BUTT-IN", WHICH CLIPS DIRECTLY ONTO THE LINE PAIR.
>
>>A TELEPHONE INTERFACE OR "PHONE PATCH" FOR A HAM RIG IS BEST DONE WITH A
>>TRANSFORMER -BASED HYBRID, WHICH IS EASILY HOMEBREWED.  DESIGNS FOR THESE
HAVE
>>BEEN AROUND SINCE THE 50'S IN NUMEROUS HAM RADIO ARTICLES, INCLUDING QST.
>
>Uh... no, read the article... he means phone tap. autopatch (where one
>can make phone calls from a HT) is something different..

No, he's correct. Phone taps are what the FBI, spies, and other
scum do, broadcasters do phone interfaces, or patches, and so do
hams. A phone patch is a *two* way interface with the phone network
while a tap is a one way eavesdropping technique. You're thinking of
*autopatching*, which is a semi-automatic variation of phone patching
used by repeater stations. Phone patches pre-date repeaters and HTs,
and have traditionally been manually controlled by the local operator.

Patching terminology came from the broadcasting world where phone
lines are traditionally terminated in patch fields through two wire
to four wire hybrids, and the operator could patch the line into the
console at need. Prior to the Carterphone decision, the telco had
to supply the hybrid. Now, of course, we can supply our own.

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     |                     |

--- QScan/PCB v1.15b / 01-0228
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 [e-mail]                  //                   Running PCBoard 15.22
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From [e-mail] Tue Sep 12 11:26:37 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!gary.p..fiber
From: [e-mail] (GARY P  FIBER)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone ever use that
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (GARY P  FIBER)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 33


From: [e-mail] (Gary P. Fiber)
Subject: Re: Anyone ever use that Mr. Beer thing?
Date: 9 Sep 1995 03:46:55 GMT
Message-ID: <42r2nf$[e-mail]>
In article <42dn2v$[e-mail]>, [e-mail]   (Bill Newkirk) says:
>
>In <420ofn$[e-mail]>, [e-mail] (Paul M. Zeller) writes:
>>I was browsing my television channels, as I tend to do from time to
>>time, and noticed a thing called Mr. Beer on QVC 2.  Does anyone have
>>any experience with this and is this worth it?  It appears to be
>>cheaply put together.
>
>zounds! sounds like a visit to alt.beer is in order...
>
Are all of to young to remember " 807s ".  :)

Gary





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From [e-mail] Tue Sep 12 11:26:39 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!intac!hobbs!gary.coffman
From: [e-mail] (GARY COFFMAN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 900 MHz repeaters
Message-ID: <[e-mail]>
Date: Sun, 10 Sep 95 01:01:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-3126
Reply-To: [e-mail] (GARY COFFMAN)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 50


.cc.duq.edu!news.duke.edu!agate!howland.reston.ans.net!swrinde!emory!cssun.mat
hcs.emory.edu!wa4mei!ke4zv!garyFrom: [e-mail] (Gary Coffman)
Subject: Re: 900 MHz repeaters
Message-ID: <[e-mail]>
s>
Date: Sat, 9 Sep 1995 03:53:23 GMT
In article <42pt7o$[e-mail]>
[e-mail] (Tom Swisher) writes:
>Gary Coffman ([e-mail]) wrote:
>: In article <420j0j$[e-mail]> [e-mail] (Mark
McDermott) writes:
>: >Has anyone built a 900 MHz repeater out there, if so what did you use
>: >for the RXTX sections?
>
>: Grainger Associates 6710 duplex radio. Rack mount, 15 watts, duplexer
>: included, 24 MHz split. Works good, costs little (surplus anyway).
>: These radios were originally intended to supply the equivalent of
>: a 4-wire leased line over radio in the spectrum immediately above
>: 928 MHz. A crystal change and a bit of tweaking brings them down
>: into the ham band. And a simple controller turns one into a repeater.
>: The harder part is finding mobile and HT rigs for the users.

>Where'd you get it???????? How much????? Enquiring minds want to know!!!!!

The local power company was using them to control their network before
they switched to fiber. I bought all they had at a surplus sale. They
were using GA 6710s as masters, GA Scancom 1200s in the switchyards,
and a bunch of Motorola MR9600s for trunks. I've been peddling the
excess units at hamfests for a couple of years now. I still have 5
of the MR9600s available, in 8 foot rack mounts. $150 each, you pay
truck freight.

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     |                     |

--- QScan/PCB v1.15b / 01-0228
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 [e-mail]                  //                   Running PCBoard 15.22
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From [e-mail] Tue Sep 12 11:26:40 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Robert Hulvey)
Newsgroups: comp.robotics.misc,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Seeking Info on Short-Range (8-9 ft) RF Data Links
Date: 10 Sep 1995 01:41:11 GMT
Organization: Netcom
Lines: 64
Message-ID: <42tfnn$[e-mail]>
References: <42slgb$[e-mail]>
NNTP-Posting-Host: ix-la25-04.ix.netcom.com
X-NETCOM-Date: Sat Sep 09  6:41:11 PM PDT 1995
Xref: grape.epix.net sci.electronics:142929 rec.radio.amateur.homebrew:9414

> It seems there
>are several FM transmitter ICs for Mr. Microphone/Karoke toys, not too
many
>simplified FM receiver chips and no one I've found that builds an FSK
modem into
>them.  It seems this problem crosses multiple disciplines so I've been
unsure of the
>best place to look.
>
>I'm looking for a very low-cost approach to have a 9600-baud serial
link between
>non-line-of-sight but close-proximity points.  It seems such gadgets
would be
>useful for many different projects; radio-controlled cars, radio-mice,
robots etc.


For simple commands that only go across the link in small bursts,
Holtek makes some nice chips for remote control applications  These
chips can be used to modulate IR, RF or whatever.  They just
encode/decode a ternary (3 state) string which you program by tying a
few inputs high or low, or leaving them open.  I've heard the open
state can be unreliable, but I would think that tying it to a voltage
divider made from two equal value resistors might keep it stable.
Untied high-impedance inputs have a tendency to float around with 60Hz
current in your walls.

For a continuous link, the XR-2206 and XR-2211 can be used to do simple
FSK encoding and decoding.  The chips are made by Exar, but can also be
found from other suppliers.  However, they only work up to a few 100
kHz.  You could chopper-modulate them up to the frequency of interest,
though, and then filter it to the proper bandwidth.  Then, just chpper
modulate it back down before demodulating it at the receiver.

Of course, you would have to abide by the good ol' FCC part 15, no
matter what you do, and the 26.96MHz to 27.28MHz and 49.82MHz to
49.90MHz bands ( I think those frequencies are right, but I'd check
that) are commonly used for remote control applications (like RC cars
and boats, etc.).  For FSK at these frequencies, you might try a
74HC4046 (or 74HCT4046) made by RCA/Harris.  (Other versions of the
4046 like the original CMOS CD4046 made by Harris, or the MC14046 by
Motorola) only go to around 1 MHz.)  It might be tweaked into working
at the 27 MHz band with a really small cap.  However, it may be
unstable.  Also, you could build a voltage controlled oscillator with a
varactor cap and a transistor and a crystal to control the frequency
and use that for generating FSK.  Crystals for such a VCXO are
available from hobby shops who sell remote control items.  There are
also several PLL circuits which will operate at those frequencies.

The chip in most of those Mr. Microphone toys is probably the BA1404
made by ROHM in San Diego.  It doesn't even operate over the entire FM
broadcast band if I remember correctly (just the lower half, I think),
but might be made to work at lower frequencies.  You can buy a kit
based on the BA1404 from Ramsey Electronics.  Also, they have an FM
receiver kit.  You could start with these kits and modify them to
transmit data.

I think there are many ways of doing this with the current technology,
but all will require some tailoring to the specific band you are
planning to transmit in.  That usually means doing a little math to
calculate tank frequencies, filter cut-off frequencies, RC time
constants, etc.  All are pretty cheap, too.  Good luck!

-Rob


From [e-mail] Tue Sep 12 11:26:41 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!eskimo!rmwatson
From: [e-mail] (Robert Watson)
Subject: WTD: Source for Surplus Inductors, Transformers, Etc.
X-Nntp-Posting-Host: eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: Eskimo North (206) For-Ever
X-Newsreader: TIN [version 1.2 PL2]
Date: Sun, 10 Sep 1995 02:30:29 GMT
Lines: 73


I am working on a homebrew project, and need a reliable source for
SURPLUS hard to find and obsolete power transformers, coils, and other radio
parts. Your help is appreciated. Also, please see the following list of
parts I need, maybe we could work something out.

Thanks,

Robert/KJ7BO
[e-mail]

LIST:

TRANSFORMERS:

Triad R-8A (or equivalent)
250-0-250 volts, 75ma
5v, 2A
6.3v, 2.5A
(Qty: 1)

Stancor PM-8410 (or equivalent)
360-0-360 volts, 120ma
5v, 3A
6.3v, 3.5A
(Qty: 1)

Stancor A-3823 (or equivalent)
8.5K Ohm to 3.2 Ohm voice coil
(Qty: 1)

Miller 512-W1 (or equivalent)
1,500 KHz/(Kc) Converter
(Qty: 1)

CHOKES:

Thordarson 20C50 (or equivalent)
350h, af-coupling
(Qty: 1)

Thordarson 20C53 (or equivalent)
12h, 80ma filter
(Qty: 1)

National R-100 (or equivalent)
2.5mh RFC
(Qty: 3)

Stancor C1001 (or equivalent)
10.5h, 110ma
(Qty: 1)

Stancor C2305 (or equivalent)
5h, 100ma
(Qty: 1)

COILS:

Barker & Williamson 40JEL (Plug-in end link set)
Barker & Williamson 80JEL (Plug-in end link set)
(Qty: 1 each)

Note: If anybody has suggestions on where to learn how to make the above
coils, please let me know, ie books, or whatever.

Your help is indeed appreciated, and I will provide an update as to what
has been found, etc.

73 de Robert/KJ7BO
[e-mail]




From [e-mail] Tue Sep 12 11:26:42 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: PARTS is parts
Date: 10 Sep 1995 18:34:12 GMT
Organization: Real/Time Communications - Bob Gustwick and Associates
Lines: 5
Message-ID: <42vb34$[e-mail]>
NNTP-Posting-Host: maria-4a.ip.realtime.net
X-Newsreader: AIR News 3.X (SPRY, Inc.)

I've got amp building parts; plate transformers, electolitic caps. air vari.caps. plate choke, plate blocking
cap. cabinets, blowers etc etc   let me know what you need , I'll see if I got it , and let you know how much I
need for it.
                                  Matt/KK5DR



From [e-mail] Tue Sep 12 11:26:44 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!mnemosyne.cs.du.edu!nyx10.cs.du.edu!not-for-mail
From: [e-mail] (larry kollar)
Newsgroups: comp.robotics.misc,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Seeking Info on Short-Range (8-9 ft) RF Data Links
Date: 10 Sep 1995 20:33:01 -0600
Organization: University of Denver, Dept. of Math & Comp. Sci.
Lines: 39
Message-ID: <43074t$[e-mail]>
References: <42slgb$[e-mail]>
NNTP-Posting-Host: nyx10.cs.du.edu
Xref: grape.epix.net sci.electronics:143093 rec.radio.amateur.homebrew:9432

Thus spake Jeff Rush:

>Can anyone direct me to an info source for short-range radio links used to
>keep several robots in constant contact with a central computer, in a
>constrained
>environment like a test maze?  Must be low-power and light-weight.

[...]

>I'm looking for a very low-cost approach to have a 9600-baud serial link
>between
>non-line-of-sight but close-proximity points.

>  I'm also thinking of pulsed, dispersed IR
>with many detectors mounted around the maze.  I need bi-directional, so the
>maze would also have many ganged transmitters with a receiver on the robots.

IR is probably your best bet.  I've seen point-to-point links over 1/4 mile
using IR... no licensing hassles, no interference from CBs or baby monitors,
etc.

By sheer coincidence, the October MacUser has a quick review of an
IR-based LocalTalk setup called GameNet.  It's not cheap ($160 for a
pair, includes a two-person copy of Marathon), but it'll give you lots
more than 9600-baud and covers a room up to 25'x25'.

Given that your robots probably don't have Macs on board, this isn't
exactly what you're looking for... but the technology *IS* available at
the consumer level.  You probably won't even need to mount detectors;
just paint the ceiling white & aim your transcivers straight up.

The company is Photonics, SanJose CA.  800-997-2326 or 408-955-7930.
Not that they're going to send you a schematic or anything, but you
might be able to get some leads on where to find the IR gadgets....

Hope this helps.
--
Larry Kollar, Dawsonville GA  | *** Hatred is murder *** (1 Jn 3:15)
[e-mail]      | Crawling down the infobahn at 1200 baud...


From [e-mail] Tue Sep 12 11:26:45 1995
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news-feed-1.peachnet.edu!darwin.sura.net!bcfreenet.seflin.lib.fl.us!dcfreenet!d013889c
From: [e-mail] (Al Goldberg)
Newsgroups: rec.radio.amateur.homebrew
Subject: schemat
Date: 11 Sep 1995 00:43:13 GMT
Organization: SEFLIN Free-Net - Dade
Lines: 7
Message-ID: <4300n1$[e-mail]>
NNTP-Posting-Host: dcfreenet.seflin.lib.fl.us
X-Newsreader: TIN [version 1.2 PL2]



--

Al Goldberg
[e-mail]



From [e-mail] Tue Sep 12 11:26:46 1995
Newsgroups: comp.robotics.misc,sci.electronics,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: Seeking Info on Short-Range (8-9 ft) RF Data Links
Message-ID: <[e-mail]>
Organization: College Park Software, Altadena, CA
References: <42slgb$[e-mail]> <42tk5j$[e-mail]>
Date: Mon, 11 Sep 1995 01:59:38 GMT
Lines: 17
Xref: grape.epix.net sci.electronics:143053 rec.radio.amateur.homebrew:9421

[e-mail] (RMore30042) writes:

>In the 8 - 9 foot range you will find that infrared communications is far
>superior.  It is a simple matter to use commonly available IR detectors
>(they cost around $2.50) and LEDs to transmit serial data.  With checksums
>and an ACK NAK protocol this can be very reliable and really inexpensive.

Your robot could have a little whip "antenna" sticking up above hte maze
walls, with an omni directional emitter-sensor on it. The PC could have
a wide angle (120 degrees) mate to it.


--
---
Mike Morris                                [e-mail]
#include <disclaimer.std.h>       I have others, but this works the best.
   This message assembled from 100% recycled electrons (and pixels).


From [e-mail] Tue Sep 12 11:26:47 1995
Path: grape.epix.net!news.sprintlink.net!globe.indirect.com!NewsWatcher!user
From: [e-mail] (David Forbes)
Newsgroups: alt.radio.college,alt.radio.pirate,alt.radio.talk,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: PHONE TAP: YOU MEAN PHONE PATCH!
Date: 11 Sep 1995 08:30:05 GMT
Organization: Internet Direct, Inc.
Lines: 15
Message-ID: <boboforbes-1109950130200001@165.247.101.36>
References: <42j92t$[e-mail]> <42qejj$[e-mail]> <[e-mail]>
NNTP-Posting-Host: s65.tucslip.indirect.com
X-Newsreader: Value-Added NewsWatcher 2.0b24.0+
Xref: grape.epix.net alt.radio.pirate:10011 rec.radio.amateur.homebrew:9430 rec.radio.amateur.misc:86372

In article <[e-mail]>, [e-mail]
(Steve Hideg) wrote:

> In article <42qejj$[e-mail]>, Don Huff <[e-mail]> wrote:
>
> > JUST A HAM RADIO TERMINOLOGY CLARIFICATION:  TELEPHONE INTERFACES  TO
>
> <deletia>
>
> I thought hp computers had lower-case letters in their character sets by now.

Not HP computers used by hams! They use Morse code instead of ASCII. It's
a factory option, only $250 extra.

--Bobo [I couldn't resist]


From [e-mail] Tue Sep 12 11:26:48 1995
Path: grape.epix.net!news.sprintlink.net!news.onramp.net!usenet
From: [e-mail]@  (Jeff Rush)
Newsgroups: comp.robotics.misc,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Seeking Info on Short-Range (8-9 ft) RF Data Links
Date: 11 Sep 1995 10:21:18 GMT
Organization: On-Ramp; Individual Internet Connections; Dallas/Ft Worth/Houston, TX USA
Lines: 25
Message-ID: <4312iu$[e-mail]>
References: <42slgb$[e-mail]> <42tfnn$[e-mail]>
Reply-To: [e-mail] (Jeff Rush)
NNTP-Posting-Host: dal14.onramp.net
X-Newsreader: IBM NewsReader/2 v1.2
Xref: grape.epix.net sci.electronics:143110 rec.radio.amateur.homebrew:9433

In <42tfnn$[e-mail]>, [e-mail] (Robert Hulvey) writes:
>For simple commands that only go across the link in small bursts,
>Holtek makes some nice chips for remote control applications.

>For a continuous link, the XR-2206 and XR-2211 can be used to do simple
>FSK encoding and decoding.  The chips are made by Exar, but can also be
>found from other suppliers.  However, they only work up to a few 100
>kHz.  You could chopper-modulate them up to the frequency of interest,
>though, and then filter it to the proper bandwidth.  Then, just chpper
>modulate it back down before demodulating it at the receiver.

Exar I've heard of but not Holtek, although I had forgotten Exar until now.
Does anyone have contact info easily at hand for:
  Holtek
  Exar

Or if there are other outlets for hobbyists, I'd appreciate those.  Some of the
parts houses here in Dallas are sticky about non-large corporate buyers of
prototype quantities.  It didn't use to be that way, but it is getting harder.

Thanks for your response, and thanks to several other people.  I'm seeing
several good responses outlining approaches I had not considered.

-Jeff



From [e-mail] Tue Sep 12 11:26:48 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need help with Vladimirescu's "The Spice Book"
Date: 11 Sep 1995 13:23:00 GMT
Organization: Netcom
Lines: 10
Message-ID: <431d7k$[e-mail]>
NNTP-Posting-Host: ix-pa1-17.ix.netcom.com
X-NETCOM-Date: Mon Sep 11  6:23:00 AM PDT 1995


I picked up a copy of Vladimirescu's "The Spice Book" while visiting my
old alma mater over the weekend.  When I returned home I discovered
that half of page 383/384 was missing.  Because it's an hour drive each
way to exchange the book, I was wondering if someone who has this book
could copy these two pages for me?  I'll gladly send you $1 in return.

Thanks,

- Jeff, WA6AHL


From [e-mail] Tue Sep 12 11:26:49 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!hearye.mlb.semi.harris.com!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: B&W 850 Tank Coil
Date: 11 Sep 1995 15:31:07 -0400
Organization: Harris Controls Division
Lines: 16
Message-ID: <4322pr$[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]



Does anyone have one laying around or have the specs on one? Actually
what I want to know is what the low frequency winding consists of. The
one I have has a sagging coil (as most are that I see) and I'd like
to replace the coil section. How many turns of what wire, or what coil
stock is used for this???


Thanks, Doug, N4IJ [e-mail]

--
Doug  Snowden
work: [phone]
[e-mail]



From [e-mail] Tue Sep 12 11:26:50 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tank.news.pipex.net!pipex!btnet!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solid state convesions.
Date: Mon, 11 Sep 95 16:09:23 GMT
Lines: 27
Message-ID: <[e-mail]>
References: <42lj4v$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Gary Coffman) wrote:

>Yes, sounds like you're trying to ruin a fairly good pair of old
>radios by turning them into poor clones of modern Japanese radios.
>The Japanese have more experience, and more engineers. You're
>unlikely to come up with anything that works as good as the B line
>does now, much less as good as a modern Japanese radio.

Geez Gary, you're making a lot of assumptions about Pat's technical
ability aren't you?  Most tube designs aren't that difficult to
substitute with solid state, as long as the overall plan for devices
and circuits is laid out from the beginning.

You know, as a fun project, this is sure a lot easier than starting
from scratch.  So what if the intrinsic value of the equipment is
lost?  These rigs aren't exactly rare, and besides, he didn't say he
wanted to sell it when he was done.

Personally, I've always considered projects like the one he's
describing to be an integral part of homebrew.  Based on past
modification articles in Amateur Radio magazines, I'd say other Hams
do too.

73,

Jack  WB3U


From [e-mail] Tue Sep 12 11:26:52 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Re: Ammeter shunt help needed...
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Mon, 11 Sep 1995 18:30:55 GMT
References: <42omog$[e-mail]>
Nntp-Posting-Host: hplsnb.lsid.hp.com
Organization: Hewlett-Packard
X-Newsreader: TIN [version 1.1 PL9.4]
Lines: 18

W8JI  Tom ([e-mail]) wrote:
: Tom, Actually the way we made sure stray resistance didn't hurt was to tap
: the meter across an inner section of the shunt material, with the high
: current connections at the outside. We used low current meters. If the

(Standard Kelvin connection, and the only way to go for things like this!)

: meter is a full current meter with internal shunt (usually the case in
: cheap automotive or generator type moderate current applications) I can't
: think of any way to avoid contact resistance problems. Can you?

Welding??  ;-)    (Or perhaps removing the internal shunt, if there really
is one.  I think most of the OEM ones aren't moving-coil meters, but rather
wierd things like moving magnet, next to the bus carrying the current, or
thermal, working on expansion and contraction--though that doesn't work to
distinguish charging and discharging currents of the same magnitude.)

73, Tom (the K7ITM one)


From [e-mail] Tue Sep 12 11:26:53 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!col.hp.com!jms
From: [e-mail] (Mike Stansberry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info wanted on Heath HX-1681 transmitter
Date: 11 Sep 1995 20:43:05 GMT
Organization: HP Colorado Springs Division
Lines: 19
Message-ID: <43270p$[e-mail]>
References: <42tbrc$[e-mail]>
NNTP-Posting-Host: mssjms.col.hp.com
X-Newsreader: TIN [version 1.2 PL2]

Jim Potter ([e-mail]) wrote:
: I just purchased a shiny, new-looking Heath HX-1681 at an auction, cheap.
: It is a transmitter for 80 through 10.  The final has a pair of tubes -
: looked like 6146's but could be sweep tubes.  I didn't open it up that
: far.  Can anyone tell me a bit more about it? specfications? vintage?
: I'd also be interested in locating a schematic and/or manual for a fair
: price.  It's also missing the power cable, an 11 pin "octal type", male
: on one end, female on the other. (I don't know what else to call it, it
: looks like an octal tube base, but with 11 pins.)

It's a fairly good CW only transmitter.  I got mine about 15 years ago.
I built the xmtr and my wife built the power supply for me. It DOES
need an external power supply.  It uses 6146 tubes, and a tube driver
for the output stage.  I've had trouble with the driver tube going
bad at a fairly regular interval.  I can bring in the manual and
send you the specs, if you want.

Mike, K0TER



From [e-mail] Tue Sep 12 11:26:54 1995
Path: grape.epix.net!news.sprintlink.net!news.icon.net!okc134.icon.net!ssampson
From: [e-mail] (Steve Sampson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Rf link for Network
Date: Mon, 11 Sep 1995 22:10:53
Organization: (ICON) InterConnect Online, Inc.
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: okc134.icon.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <[e-mail]> [e-mail] (Myself) writes:

>I am after a schematic diagram for a rf link to be put into a network.
>Through put has to be over 1Mbaud and the output power has to be enough
>to be able to link up over 5 km.
>Any designs would nice .....

How much money are you willing to spend on building what's on the schematic?
I have an early 70's link design using a klystron at 40 Watts :-)



From [e-mail] Tue Sep 12 11:26:55 1995
Path: grape.epix.net!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone ever use that
Date: 12 Sep 1995 00:16:30 GMT
Organization: News & Observer Public Access
Lines: 12
Message-ID: <432jgu$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: grail1110.nando.net

[e-mail] (GARY P  FIBER) wrote:
>
> Are all of to young to remember " 807s ".  :)
>
> Gary
>
>
Brings back fond memories - especially of Field Days when
there was a special bin for dead 807s.  :>)

Tnx es 73,
Don W3FPR


From [e-mail] Sun Sep 17 12:00:25 1995
Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: (HELP)CORE CHOICE FOR COIL DESIGN
Date: 12 Sep 1995 01:47:59 GMT
Organization: Primenet [phone]
Lines: 42
Message-ID: <432osg$[e-mail]>
References: <[e-mail]> <42ps04$[e-mail]>
NNTP-Posting-Host: usr5.primenet.com
X-Newsreader: TIN [version 1.2 PL2]

Roy Lewallen ([e-mail]) wrote:
: ;   [e-mail] writes:
: ;  I am working on a radio design for thru the ground radio using coils as the
: ;  receiver and transmitter antenna.
: ;
: ;  I need a impedance matching transformer between the coil and the receiver. The
: ;  problem is that I need a very high al value (Large amount of inductance).
: ;
: ;  Powder Iron toroids are out of the question because of size. My other choice
: ;  is a ferrite pot core made by Amidon which is type material 77. It is of the
: ;  right size and will accommadate the windings. This material is primarally used
: ;  at higher frequencies than the 31 KHZ I wish to use.
: ;
: ;  Will this type of core material (type 77) cause excessive core loss (poor
: ;  sensitivity due to core loss at receiver impedance match) at the frequency I
: ;  wish to use on receive (31KHZ).
: ;
: ;  If so, Then can you suggest another core manufactor and type material.
: ;
: ;  Danny Britton
: ;  [e-mail]

: The type 77 pot core is a good choice for this application. Use one which does
: not have a gap.

: Roy Lewallen, W7EL
: [e-mail]

I would like to suggest that you use Litz wire to improve the Q of the coil.
Litz wire is composed of a number of single strands of enamled magnet wire,
covered usually with a cotton or silk sheath.  It can be somewhat expensive,
but it is well worth the effort and cost.

                                        Chris Trask / N7ZWY

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


From [e-mail] Sun Sep 17 12:00:26 1995
Path: grape.epix.net!news.sprintlink.net!jupiter.planet.net!news.ia.net!usenet
From: [e-mail] (Allan Butler)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Radio for 9600 baud@UHF
Date: 12 Sep 1995 04:31:10 GMT
Organization: Inter Access Internet services Cedar Rapids IA USA
Lines: 15
Message-ID: <4332ef$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pbutlalj.ia.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11
Xref: grape.epix.net rec.radio.amateur.digital.misc:10466 rec.radio.amateur.homebrew:9487

                Hello Everyone,

        I was wondering if there are any suggestions out there for which
radios are easiest to convert to UHF 9600 baud packet radios.  There are
several people in the area that would like to get on the air and it has
been a while since anyone purchased any commercial radios that got
converted to this mode.  Of course we are looking at inexpensive and
reliable radios.

        Thanks for any information that would be available out there.

--
                                                Allan Butler KA0IES
                                                [e-mail]



From [e-mail] Sun Sep 17 12:00:27 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!news.corpcomm.net!news.pepboys.com!netaxs.com!usenet
From: "[e-mail]" <Joe Rocci>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 455KHz IF amp ICs: Any Suggestions?
Date: 13 Sep 1995 10:16:21 GMT
Organization: Net Access - Philadelphia's Internet Connection
Lines: 12
Message-ID: <436b1l$[e-mail]>
References: <435955$[e-mail]>
NNTP-Posting-Host: slip-748.netaxs.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b4 (Windows; I; 16bit)

Just about any modern transistor or IC is going to have frequency
response several orders of magnitude greater than 455 KHz.

Not to worry!

Take a hard look at the Motorole MC1350...it will give you just about 50
dB of gain with an untuned input and a single tuned output...very easy to
handle, even without UHF construction techniques.

Joe
WA3CMQ



From [e-mail] Sun Sep 17 12:00:29 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!swrinde!emory!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: turnstile antenna
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <435kf3$[e-mail]>
Date: Wed, 13 Sep 1995 17:04:49 GMT
Lines: 61

In article <435kf3$[e-mail]> [e-mail] (Mike Brothers) writes:
>I'm interested in listening to the satelites with my scanner.  The small
>whip on my scanner has a hard time picking up the birds.  In an old
>issue of Science Probe (premier issure, Nov. 1990), An artical written
>by David A. Wolf mentions building a "turnstile antenna" using copper
>wire and pvc pipe.  Complete construction details appeared in the next
>issue.  The problem is, I don't have this issue!
>
>Can anyone help me out?

A turnstile is a simple antenna, just two crossed dipoles mounted
a quarterwave above a groundplane (usually made from window screen
wire stretched on a frame). Two 1/4-wave sections of 75 ohm coax,
one to each dipole and joined by a coax Tee to a 50 ohm cable to the
receiver is how you feed it.

There are much better antennas. The popular eggbeater style is
better, a Lindenblad or a quadrafilar helix are better still
while still being omni-directional (and circularly polarized).
Steerable yagis are better yet. Cost and complexity rise with
performance, however, and the turnstile is one of the cheapest
and easiest antennas that will offer improvement over the scanner's
whip.

(All these antennas are described in "The Satellite Experimenter's
Handbook, available from the ARRL.)

For passes below 30 degrees above your local horizon, however,
a gain vertical antenna will outperform the turnstile. That's
because the turnstile has maximum gain straight up, where you
need it least because the satellite is closest to you at that
time. The vertical offers gain toward the horizon, where you
need it most because the satellite is furtherest from you at
that time.

Using both, and a coax switch to choose between them, is a
viable alternative for a manned receive site, or an automated
site with the coax switch driven by a timer. This type of
antenna arrangement is only suitable for the LEO birds. For
those in higher orbits, you need the extra gain of a steered
yagi or helix.  Hand steering is viable in a manned station,
but automatic rotators are needed for an automated setup.

Your scanner's IF filters are too broad for best results,
but should suffice for most of the LEO birds. For the higher
orbit birds, you need a filter response tailored to the
power spectrum of the satellite's signals in order to have
a good SNR. And an antenna mounted preamp will be a major
boost if you have a long lossy feedline run. The preamp
won't be a great help with an omni antenna that has Earth
in it's main lobe, however, because the Earth's noise
temperature will set a floor to the achievable SNR. An
antenna with its main lobe excluding Earth can benefit
much more from a low noise preamp.

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] Sun Sep 17 12:00:29 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!uknet!liv!runestaff.pbs.plym.ac.uk!arc.csd.plym.ac.uk!user
From: [e-mail] (Mark H. Steer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Bugs & Transmitters
Date: Thu, 14 Sep 1995 11:16:30 +0100
Organization: Network Support, University of Plymouth
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: arc.csd.plym.ac.uk


 Can anyone out there supply me with / point me in the direction of
microtransmitter plans available over the net. Any help greatly
appreciated.

EMail me: [e-mail]


From [e-mail] Sun Sep 17 12:00:31 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!news.delphi.com!uunet!in2.uu.net!news.erinet.com!bug.rahul.net!a2i!sierra.net!NewsWatcher!user
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1500B push-pull amplifer.
Date: Thu, 14 Sep 1995 15:14:26 -0700
Organization: Engineered Solutions
Lines: 31
Message-ID: <rst-1409951514260001@204.94.234.244>
References: <[e-mail]> <4379a5$[e-mail]> <439n0m$[e-mail]>
NNTP-Posting-Host: 204.94.234.244

In article <439n0m$[e-mail]>, [e-mail]
(Charles A. Sherwood) wrote:

> I read in the VHF/UHF Manual that push pull is the prefered way to build a
> vhf amp. Push pull is limited to single band but for vhf that is usually
> all you can do anyway. Its been a while since I read this, but I remember
> the primary reason for using a push pull configuration is because the
> tube capacitance in divided in half, making it easier to make a vhf amp.
> I think this affects circuit Q. I think the push pull also has lower
> harmonics.
>
> my two cents worth.
> chuck sherwood
> [e-mail]


Yes, it is the preferred way in some applications to build a vhf amp
because it tends to halve the tube capacitances.  There are other ways to
deal with the C, which the referenced Handbook amp used, though I can't
recall what it was, and if I go look it up, I'll lose my connection...
And the push-pull also cancels even order harmonics, which may be academic
if the single ended design is done right, though I note your orgs hybrid
amps for CATV and cellular are universally push-pull for those reasons.
Push-pulls can be built for multiband, classically (at HF) using plug-in
coils, perhaps you could build one using some humongous double pole switch
to bring in the inductors (don't key it while switching...).
The complexities of the mechanical design requirements make me prefer to
build two in parallel; a rigorous parallel design can make the even order
harmonic advantage that push-pull designs have an academic point.

rst, ex WB6BXU


From [e-mail] Sun Sep 17 12:00:32 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Ramsey Kits
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <42f5d5$[e-mail]> <42fbs1$[e-mail]> <[e-mail]> <42n7nj$[e-mail]> <[e-mail]> <[e-mail]>
Date: Thu, 14 Sep 1995 16:45:03 GMT
Lines: 78

In article <[e-mail]> [e-mail] writes:
>In article <[e-mail]>, <[e-mail]>
>writes:
>> Folks, if you're going to build transmitters, look at the kit
>> suppliers as convienent one stop purchasing agents, but know
>> enough about design and testing to correct their errors and
>> tune up their designs properly, just as if you were working
>> from scratch. If all you know is how to follow directions in
>> a manual, you'll likely end up in deep doo.
>
>But the Ramsey kit _seems_ to offer a functional 2M transceiver for MUCH less
>money than even a cheap HT, this makes it very attractive to folks without a
>lot of money to spend! I might build one but I have ready access to the test
>equipment to make sure it's legal though I would probably do so even if I did.
>I'm currently studying for the license exams and when I look at the prices for
>some of the 2M equipment I have to admit I'm a little put off. Is there a
>low-buck alternative (after all 50% off an expensive radio still may not be a
>bargain for some) ?

Yes, there is an alternative, commercial 2-way surplus. You can easily
and inexpensively convert surplus commerical 2-way gear to the 2m or
70cm bands from their adjacent commercial allocations. And this stuff
is cheap, typically in the $50 and under price range. Its also likely
to be of higher quality and higher performance than even the big buck
new amateur gear. Of course there won't be any Gameboy features, and
it won't be a sorry excuse for a scanner, but it will be a great
communications radio.

As example, I bought a high band GE MVP that someone had installed in
a portable carrying case for $10 at Dayton. It was crystalled on a
Forest Service frequency. When I got this diamond in the rough home
and opened the homemade case, I found a brand new looking 90 watt
amplifier tucked inside, and the MVP worked too! $20 for a set of
channel element crystals in the 2 meter band, a bit of tweaking,
and I have a 90 watt portable or mobile rig that will outperform
any Japanese radio or Ramsey kit as far as purity of emissions
and freedom from intermod are concerned, all for a total outlay
of $30.

Now you won't stumble on something like this every day, but I
did pick up 3 UHF Mastr Execs (80 watt mobiles) the same day
for $50 each to serve as repeater spare parts, and they all
worked too! There are stacks and stacks of Motorola and GE
commercial rigs for sale at most hamfests. HTs too! If you
take the time to learn the combo numbers of the various models,
you can find some wonderful communications radios, cheap.

IMHO, Motorolas are overpriced on the amateur market, especially HTs,
so I mostly search out GE radios. They're perhaps even more bulletproof
than the Motos, but are usually cheaper. I bought 8 GE PE HTs with a
gang charger all for $100 once. They were ex-police UHF units. Those
things can be used as clubs for subduing the bad guys, and then used
to call it in. They won't fall to pieces under rough treatment like
the Japanese HTs, and they also won't howl with intermod in high RF
areas.

Of course, all but the newest, and most expensive, commercial
surplus will be crystal controlled, but most hams hang out on
only one or two repeater frequencies most of the time anyway,
so that's not really a problem.  The commercial rigs are typically
2, 6, or 8 channel units. If you fill all the channel element
slots in an 8 channel unit, you could spend $160, but you typically
don't need that many frequencies. If you do, you might opt for
the more expensive synthesized surplus equipment. That might
run you $200 or so (and you might pull your hair figuring out
how to program the synthesizer). I haven't felt the need, and
avoid the aggravation of fooling with synthesizers.

These rigs also make wonderful packet radios.  Tuck them in
a crawl space somewhere and forget them. They'll just work and
work for years and years without attention.

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] Sun Sep 17 12:00:34 1995
Path: grape.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!news.netins.net!solaris.cc.vt.edu!newsfeed.internetmci.com!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (MattCrw17)
Newsgroups: rec.radio.amateur.homebrew
Subject: help with DTMF reciever project
Date: 14 Sep 1995 18:44:58 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <43ab9a$[e-mail]>
Reply-To: [e-mail] (MattCrw17)
NNTP-Posting-Host: newsbf02.mail.aol.com

I would really appreciate any help or info on this project.  Maybe
somebody here has built something similar to this, and could E-mail me
tips or schematics but do not post for my benefit because I do not
frequent this group.


Okay, I need a DTMF pad hooked up to a inexpensize short range transmitter
walkie-talkey, homebrew,or somthing like that.  I need to have my reciever
fire a relay or solenoid or something when the proper 4 digit code is
entered.  P.S. must be portable (DC)  My problem is I have little
expertise, but I could have somebody build it properly if it is too
involved.  Tips on where to salvage circuts from for this are also
appreciated.


Thanx. E-mail me


From [e-mail] Sun Sep 17 12:00:35 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.ssd.intel.com!chnews!ornews.intel.com!news
From: [e-mail] (Collier Chun)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: turnstile antenna
Date: Fri, 15 Sep 95 07:29:55 PST
Organization: Intel Corporation
Lines: 45
Message-ID: <43c2lb$[e-mail]>
References: <435kf3$[e-mail]> <[e-mail]>
NNTP-Posting-Host: cchun.intel.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.8

In article <[e-mail]>, [e-mail] says...
>In article <435kf3$[e-mail]> [e-mail] (Mike Brothers) writes:
>>by David A. Wolf mentions building a "turnstile antenna" using copper
>>wire and pvc pipe.  Complete construction details appeared in the next
>>issue.  The problem is, I don't have this issue!
>A turnstile is a simple antenna, just two crossed dipoles mounted
>a quarterwave above a groundplane (usually made from window screen
>wire stretched on a frame). Two 1/4-wave sections of 75 ohm coax,
>one to each dipole and joined by a coax Tee to a 50 ohm cable to the
>receiver is how you feed it.

One additional note: the two dipoles are fed out of phase to induce circular polarization.
The rotational polarization can be switched by determining which antenna has the
longer feedline to the tee.

>There are much better antennas. The popular eggbeater style is
>better, a Lindenblad or a quadrafilar helix are better still
>while still being omni-directional (and circularly polarized).
>Steerable yagis are better yet. Cost and complexity rise with
>performance, however, and the turnstile is one of the cheapest
>and easiest antennas that will offer improvement over the scanner's
>whip.

My observations verify this; the turnstile worked much better than the
terrestial whip.  Another possibility is the egg beater antenna, which is
(I think) vertically polarized on the horizon, and circular in the vertical
direction.  Lindenblads, like the turnstile, are easy to build as "PVC
specials".  I build a 300-ohm TV twinlead-based turnstile for the whopping
cost of about $10.  Quadrafilars are more difficult to build.

>For passes below 30 degrees above your local horizon, however,
>a gain vertical antenna will outperform the turnstile. That's
>because the turnstile has maximum gain straight up, where you
>need it least because the satellite is closest to you at that
>time. The vertical offers gain toward the horizon, where you
>need it most because the satellite is furtherest from you at
>that time.

This is true.  The biggest improvement I noticed was the elimination
of cross-polarization fading while the satellite was well-above
the horizon.  Fading, of course, led to fading ripples in my imaging.
I figured that for the interim, I was interested in seeing images of
myself, so horizon fading was acceptable.




From [e-mail] Sun Sep 17 12:00:36 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!news.bc.net!unixg.ubc.ca!van-bc!news.mindlink.net!agate!howland.reston.ans.net!EU.net!sun4nl!news
From: erwin Cremers <[e-mail]>
Subject: Transvertor for 6 Mtr. from 27Mhz
X-Nntp-Posting-Host: solair1.inter.nl.net
Content-Type: text/plain; charset=us-ascii
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I'm looking for a transvertor for 6 Mtr. with a input from a old CB rig.

Is there any body who has any experience doing this and are there schematics
available or compleet manufactured transverters to do this ??

Erwin Cremers
PE1MGR
Dutch HAM radio amateur.





From [e-mail] Sun Sep 17 12:00:37 1995
Path: grape.epix.net!news.sprintlink.net!news.onramp.net!usenet
From: [e-mail]@  (Jeff Rush)
Newsgroups: comp.robotics.misc,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Seeking Info on Short-Range (8-9 ft) RF Data Links
Date: 15 Sep 1995 10:34:06 GMT
Organization: On-Ramp; Individual Internet Connections; Dallas/Ft Worth/Houston, TX USA
Lines: 9
Message-ID: <43bkqu$[e-mail]>
References: <42slgb$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Jeff Rush)
NNTP-Posting-Host: dal11.onramp.net
X-Newsreader: IBM NewsReader/2 v1.2
Xref: grape.epix.net sci.electronics:143513 rec.radio.amateur.homebrew:9486

In <[e-mail]>, [e-mail] (Phil Harris) writes:

>There is a company called RF Monolithics in Dallas, Texas

Sounds perfect for what I want... will check them out.  They are just
down the street from me.

-Jeff



From [e-mail] Sun Sep 17 12:00:38 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!uknet!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: Re: Need advice on amp building
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Fri, 15 Sep 1995 10:43:21 GMT
Reply-To: [e-mail]
References: <sherwood.811087229@oribi>
Organization: UCL Dept of Medical Physics
Lines: 61

In article 811087229@oribi, [e-mail] (Charles A. Sherwood) writes:
>
> People,
> I need some help. I have always wanted to build an amp. I have ran
> across a supply of tubes and would like some opinions.

You lucky fella!! Want to share em???


> One is the 4-1000. This seems like an old reliable tube. There are many
> articles to copy. However it is 30 year old technology(I have a construction
> article for a 3-1000 in a 1964 handbook), so I'm wondering if I should
> consider the ceramic tubes.

> I can also obtain 4cx3000As. All the information I have is 10 pages from
> the data book. Can this tube be ran grounded grid and grounded screen
> like the 4-1000? The application notes only talk about grid driven.

I've no idea, but the data sheet would surely say? If not, I assume its not
reccomended. The 'typical operation' section usually tells you this.

> I can deal with solid state supplies, but I'm pretty lost trying to build
> a 500 volt regulated supply for the screen. Can anyone help me out here?
> Seems to me that a grid bias supply is also required.
> How about overcurrent sensors? Are they also required for grid and screen?

You need to be able to sink and source current on the screen supply. John Nelson
GW4FRX shouws in the VHF/UHF DX book (DIR Publishing), how to do it for
 4CX250/350 screen supplies
of either 300 or 350V. I've built a shunt stabilier using a rather expensive
high voltage/high-pwer FET. It works, but it not quite good enough yet for me to
be willing to advise you copy it exactly.  That provided -325V, for a grounded screen
amp, to put -325V on the cathode, with the screen earhted.

> Assuming that this tube must be used grid driven, how critical is the layout?
> Will it be a power oscillator without super critical shielding?
Assuming you take reasonable precautions - ie put the grid and anode in different
compartments, I doubt you should have any problems, but  I've never used the 4CX3000.
I've no idea of your frequency of interest, so cant comment much.

> It appears to me that the 4cx3000 will be a lot more work. Since it would
> be ran at considerably less than it capable of, maybe its not worth all
> the extra work. Opinions please?

Does the 4CX3000 need a special base ? If it does, and you dont have it, that might
be a deceiding factor. Bases usually cost much more than the valves, and are
much less easily available on the surplus market.

There was a circuit in some earlier (1991 for sure, probably others too) ARRL
handbooks for a grounded screen, signle 4CX1000A. That might be worth looking at,
since it does not require an expensive socket with a built-in screen
decoupling capacitor, it can save a lot of money. I've tried to build an amp
with a pair of 4CX1000A's in push-pull, grounded screen, using home-made
bases. However, making bases is not easy! Its very time consuming, unless you happen
to be an expert on a lathe and milling machine - which I'm not. However, it can be
done, and can save you a small fortune.

dave kirkby G8WRB.





From [e-mail] Sun Sep 17 12:00:39 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!bcrkh13.bnr.ca!NewsWatcher!user
From: [e-mail] (Garry Taylor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 455KHz IF amp ICs: Any Suggestions?
Followup-To: rec.radio.amateur.homebrew
Date: Fri, 15 Sep 1995 11:55:30 +0900
Organization: Nortel Aust.
Lines: 24
Distribution: world
Message-ID: <augxt01-150995115530@47.226.128.146>
References: <435955$[e-mail]> <43a505$[e-mail]>
NNTP-Posting-Host: 47.226.128.146

In article <43a505$[e-mail]>, [e-mail] (Geoff
Schecht) wrote:

> In article <435955$[e-mail]>,
> [e-mail] says...
>
> The MC1590 and its cheaper cousin, the MC1350 from
> Motorola have been around about 25 years and will do
> what you want to do very nicely at 455kHz. Philips and
> Plessey have some newer, lower power/noise parts but
> the Motorola IF amps are cheap and available.
>
> 73's
>
> Geoff NQ7A

Available from where, one would ask? Not only are they 25 years old,
they haven't been manufactured for years either.

 _____________________________________________________________________
| Garry Taylor                               Nortel Aust. Pty. Ltd.   |
|                                            5/380  St Kilda Rd.      |
| EMAIL:[e-mail]                       Melbourne 3004           |
|_____________________________________________________________________|


From [e-mail] Sun Sep 17 12:00:40 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (J. Duffy Beischel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ramsey Kits
Date: 15 Sep 1995 13:59:29 GMT
Organization: Netcom
Lines: 54
Message-ID: <43c0s1$[e-mail]>
References: <42f5d5$[e-mail]> <42fbs1$[e-mail]> <[e-mail]> <42n7nj$[e-mail]>  <[e-mail]>  <[e-mail]>
NNTP-Posting-Host: ix-cin3-26.ix.netcom.com
X-NETCOM-Date: Fri Sep 15  6:59:29 AM PDT 1995

In <[e-mail]>
[e-mail] writes:
>
>
>In article <[e-mail]>,
<[e-mail]>
>writes:
>
>> Folks, if you're going to build transmitters, look at the kit
>> suppliers as convienent one stop purchasing agents, but know
>> enough about design and testing to correct their errors and
>> tune up their designs properly, just as if you were working
>> from scratch. If all you know is how to follow directions in
>> a manual, you'll likely end up in deep doo.
>>
>> 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     |                     |
>>
>
>But the Ramsey kit _seems_ to offer a functional 2M transceiver for
MUCH less
>money than even a cheap HT, this makes it very attractive to folks
without a
>lot of money to spend! I might build one but I have ready access to
the test
>equipment to make sure it's legal though I would probably do so even
if I did.
>I'm currently studying for the license exams and when I look at the
prices for
>some of the 2M equipment I have to admit I'm a little put off. Is
there a
>low-buck alternative (after all 50% off an expensive radio still may
not be a
>bargain for some) ?
>
>Tom
>
>

Yes there is!  Ten-Tec has a real nice 2 meter transceiver kit for just
a few bucks more.  Digital read out, nice case, and complete and ready
to go.  Call Ten-Tec for their catalog.

Regards,

Duffy - WB8NUT



From [e-mail] Sun Sep 17 12:00:41 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom15!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: Looking for old QST articles
In-Reply-To: [e-mail]'s message of Fri, 15 Sep 1995 02:27:10 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]>
        <42o76b$[e-mail]> <[e-mail]>
Date: Fri, 15 Sep 1995 17:56:08 GMT
Lines: 4

In that area, there's an Antique Electronics Museum next to the BWI
Marriot in Linthicum(sp) that has a very good library, incuding QST
and other ham mags.  One of the local clubs meets there, also.
73, doug


From [e-mail] Sun Sep 17 12:00:42 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!sparky!nlcnews.nlc.state.ne.us!usenet
From: [e-mail] (Mark D. Conner)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Using HT mic on Alinco DR610T
Date: Sat, 16 Sep 1995 02:06:20 GMT
Organization: NLC Nebraska
Lines: 19
Message-ID: <43db8i$[e-mail]>
NNTP-Posting-Host: monarch.papillion.ne.us
X-Newsreader: Forte Free Agent 1.0.82
Xref: grape.epix.net rec.radio.amateur.equipment:17017 rec.radio.amateur.misc:86568 rec.radio.amateur.homebrew:9495

I recently bought an Alinco DR610T and would like to use my headset
microphone designed to be used with an Alinco/Yaesu/Icom HT.  I've
been told it's possible to make a circuit that will let it work with a
mobile rig without completely tearing apart the mike.  Has anyone
built such a thing?

E-mail responses/copies appreciated, and I'll summarize responses if
desired.

73 de Mark N9XTN



Mark D. Conner
Internet: [e-mail]
AMPRnet:  [e-mail]
"Paradigm shifting without a clutch" - Dogbert




From [e-mail] Sun Sep 17 12:00:43 1995
Path: grape.epix.net!news.sprintlink.net!news.eznet.net!usenet
From: [e-mail] (John R. Cunliffe)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transvertor for 6 Mtr. from 27Mhz
Date: Sat, 16 Sep 1995 02:37:42 GMT
Organization: E-Znet Inc. Rochester N.Y. 14623 (716)-262-2485
Lines: 26
Message-ID: <43ddih$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dialin-35.eznet.net
X-Newsreader: Forte Free Agent 1.0.82

erwin Cremers <[e-mail]> wrote:


>I'm looking for a transvertor for 6 Mtr. with a input from a old CB rig.

>Is there any body who has any experience doing this and are there schematics
>available or compleet manufactured transverters to do this ??
Look for a used or new 10m-->50Mhz transverter.  Exchange the xtal
from a 22Mhz to a 23Mhz xtal.  You may have to tweak the oszillator
circuit a little but it should work fine.  Dont forget,that this
transverters mostly have 10dBm (10 mW) input.  You may want to build a
attenuator or reduce your drive with other means.






>Erwin Cremers
>PE1MGR
>Dutch HAM radio amateur.







From [e-mail] Sun Sep 17 12:00:44 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.erinet.com!bug.rahul.net!a2i!sierra.net!squaw-d116.sierra.net!user
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4CX1500 redux
Date: Sat, 16 Sep 1995 11:45:08 -0700
Organization: Engineered Solutions
Lines: 50
Message-ID: <[e-mail]>
NNTP-Posting-Host: 204.94.233.116

Nolo Contendere,
my generalizations did not include several qualifications made by the
citation; that power gain of most grounded grid amplifiers is not as great
as tetrode amps.

In any event, it was prompted by the series screen neutralization thread.
My example cited used a directly grounded screen and a cathode floating
for DC.  The argument being that with the "high power gain" of a tetrode,
and with the significant dimensions of the screen at 144, it was highly
probable that the screen could not be "grounded" capacitively at that
frequency.  Having to AC bypass the cathode is not as problemmatic as for
the screen, as any "floating" of the cathode would only add degenerative
feedback and subsequently raise the required drive power.  The example
mentioned a very expensive version of the tube and socket that was
designed for grounded screen, they deigned to fashion a reasonable
substitute.

The example also used a pair of quarter wave lines at both grid and plate,
arguing that the impedance would drop towards zero as the frequency
changed, preventing the grid from floating off to some undefined impedance
for frequencies off resonance.

These were all details of a design that displayed 40 dB reverse isolation
while generating 25 dB of forward gain, with no neutralization.  That is a
significant achievement, and my earlier postings intended only to make
note of this amp example.

Frankly, the thread for screen neutralization went on so long (IMHO) that
I was prompted to propose an alternative.  Albeit that the Handbook data
is wrong, the example cited frankly states they got 1400 out for 10 watts
in regardless of 4CX1000 or 4CX1500.

I have seen many older Class C amplifiers, push-pull triodes, say 833's,
that gave an easy kilowatt for ten watts of drive, but they were swamped
*and* neutralized.  There were paralled 813 tetrodes or single 4-400's
giving the same output/drive performance, showing the essentially moot
choice one could have if the triodes were not GG.

I wonder what the state of kilowatt level tube development would be like
if we had not had the plethora of 100 watt output rigs, but instead only
10 watts. The ease of GG application and broadbanding of the input circuit
allowed many amps out on the market and probably made a lot of people
happy, and raised the intermod level, that drove people to better
receivers, and so on.

It still bears a review by the poor guy who originally asked the question
about PP 4CX1500's...I have frequently referred to the amp as a motivator
for when I finish my 20 watt HF transceiver.

Regards


From [e-mail] Sun Sep 17 12:00:45 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.cac.psu.edu!news.math.psu.edu!hudson.lm.com!asia.lm.com!not-for-mail
From: [e-mail] (Joe LeSesne)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: 50 to 300 Ohm converter?
Followup-To: sci.electronics,rec.radio.amateur
Date: 16 Sep 1995 20:53:15 -0400
Organization: Telerama Public Access Internet, Pittsburgh, PA
Lines: 13
Message-ID: <43frhr$[e-mail]>
References: <43fqdt$[e-mail]>
NNTP-Posting-Host: asia.lm.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: grape.epix.net rec.radio.amateur.antenna:13937 rec.radio.amateur.homebrew:9498

 Ok, I need to buid a 50 to 300 Ohm converter and I was curious as to how
 to go about it. If anyone has any ideas could you post them here or email
 me at [e-mail]

 Thanks much in advance.
                                Joe

 --


--




From [e-mail] Sun Sep 17 12:00:46 1995
Path: grape.epix.net!news.sprintlink.net!news.charm.net!news.cais.net!news.cais.com!news
From: [e-mail] (Gary Mitchelson)
Newsgroups: rec.radio.amateur.homebrew
Subject: AM-1178/GRC manual/schematic wanted
Date: Sat, 16 Sep 1995 20:55:32 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 12
Message-ID: <43fdm7$[e-mail]>
NNTP-Posting-Host: garym.cais.com
X-Newsreader: Forte Free Agent 1.0.82

I am looking for a manual or schematic for a AM-1178/GRC  400-600 Mhz
Amplifier/Multiplier.

Or does anyone have any info on converting this over to 432 mhz SSB
amp? It has a nice pair or 4X-150's in nice tuned cavities that should
work great.

Any info would be appreciated.

Gary
N3JPU



From [e-mail] Sun Sep 17 12:00:47 1995
Path: grape.epix.net!news.sprintlink.net!news.icon.net!okc148.icon.net!ssampson
From: [e-mail] (Steve Sampson)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: 50 to 300 Ohm converter?
Date: Sat, 16 Sep 1995 21:45:09
Organization: (ICON) InterConnect Online, Inc.
Lines: 17
Message-ID: <[e-mail]>
References: <43fqdt$[e-mail]> <43frhr$[e-mail]>
NNTP-Posting-Host: okc148.icon.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]
Xref: grape.epix.net rec.radio.amateur.antenna:13938 rec.radio.amateur.homebrew:9500

In article <43frhr$[e-mail]> [e-mail] (Joe LeSesne) writes:

> Ok, I need to buid a 50 to 300 Ohm converter and I was curious as to how
> to go about it. If anyone has any ideas could you post them here or email
> me at [e-mail]

Since you mention the numbers 50 and 300, I assume you are talking about
transmission lines?  That you wish to match a 300 Ohm transmission line
to a 50 Ohm transmission line?

Is this for transmitting or receiving?

How much power?

--
Steve



From [e-mail] Sun Sep 17 12:00:48 1995
Path: grape.epix.net!news.sprintlink.net!sundog.tiac.net!usenet
From: Paul Keezer <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HamView Products on the WWW
Date: 17 Sep 1995 01:33:29 GMT
Organization: PDK Inc.
Lines: 11
Message-ID: <43ftt9$[e-mail]>
NNTP-Posting-Host: keez.tiac.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b5 (Windows; I; 32bit)

Finally a WWW page has been set up for HamView products, a
Windows based Ham Radio program.  This page can now be located
at http://www.tiac.net/users/pkeezer/hamview.htm
There is an upgrade file right now for Win95, but the bug has
only been corrected in Logview 5.0  Come and check us out.

                           Paul Keezer, President of PDK Inc.






From [e-mail] Tue Sep 19 18:47:25 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!news.corpcomm.net!news.pepboys.com!netaxs.com!usenet
From: "[e-mail]" <Joe Rocci>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 455KHz IF amp ICs: Any Suggestions?
Date: 16 Sep 1995 00:20:12 GMT
Organization: Net Access - Philadelphia's Internet Connection
Lines: 12
Message-ID: <43d57s$[e-mail]>
References: <435955$[e-mail]> <43a505$[e-mail]> <augxt01-150995115530@47.226.128.146> <43c7cs$[e-mail]>
NNTP-Posting-Host: slip-748.netaxs.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b4 (Windows; I; 16bit)

Presently available version of the MC1350 is MC1349. Most specs are
identical, but noise figure is better.
Great little chip...easy to use & practically foolproof (unless you don't
load the output heavily enough, then it might become unstable).
The application circuit in the Motorola data book shows a push-pull
output circuit, but you make it single ended by taking the output from
one collector and bypassing the other. Same goes for the balanced
input...bypass one input and feed the other singled ended.

Joe
WA3CMW



From [e-mail] Tue Sep 19 18:47:26 1995
Path: grape.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: crystal drive specs  How to measure?
Date: Sun, 17 Sep 1995 16:27:03 GMT
Organization: RST Engineering
Lines: 44
Message-ID: <43hics$[e-mail]>
References: <43evsb$[e-mail]>
NNTP-Posting-Host: @rst-engr.oro.net
X-Newsreader: Forte Free Agent v0.55

[e-mail] (PTracy) wrote:

>Here we go with project #12554.  I have built several crystal oscillators
>mostly of the colpitts and pierce variety.  One spec that I never complety
>understood is Drive power to the crystal.  My usual approach to setting
>"drive" is to adjust feedback by whatever means that seems to work to a
>point where the oscillator doesn't start some times, and then back up.  I
>can measure ESR in a roundabout fasion using a signal genertor, a
>resistor, and a FET probe.  I no longer have access to a vector voltmeter
>or crystal impedance meter.  I can and have measured crystal current using
>a Tektronix current probe.  I am just not sure how to go about calculating
>the crystal drive to make sure it's within acceptable limits.  Is it as
>simple as I^2 * esr?  Nahh, couldn't be.  Unless I am mis-using the
>current probe, the current and voltage are nearly 180 deg out of phase.
>If one applies ac power triangle formulas, then the TRUE power is much
>much less than the apparent power, with reactive power being almost equal
>to apparent power.  Any help?

>Thanks, Pat - KE1C

One quick and dirty way I've done it is to measure the output power of
the oscillator into its design load (milliwattmeter or e^2/r).
Measure or calculate or estimate (SEWAG) the power gain of your device
as published by the mfg. at your freq., voltage, and current level.
The power drive to the crystal is the output power reduced by the
power gain of the circuit.  It seems like going to CHicago by way of
FOrt Worth to do it this way, but it is a pretty foolproof method of
approximating.

If you aren't at least 10 dB below the max drive limits of the rock,
you are going to get aging and drift problems.  I usually shoot for 20
dB below max limits.

Jim




Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  ARS WB6BHI  CFI A&G / Comml Inst A&G / A&P / C-182A N73CQ



From [e-mail] Tue Sep 19 18:47:27 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (BCdlr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Friend needs TS140 service man.
Date: 17 Sep 1995 22:23:13 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <43il6h$[e-mail]>
Reply-To: [e-mail] (BCdlr)
NNTP-Posting-Host: newsbf02.mail.aol.com

A friend of mine needs a service manual for a Kenwood TS140.  Anybody have
one or know where to get one reasonable?
Dan Reynolds, [e-mail], KB9JLO


From [e-mail] Tue Sep 19 18:47:28 1995
Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ Leblanc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Quasi-sync detector in the new Handbook?
Date: 17 Sep 1995 22:57:14 GMT
Organization: Hurricane DX Club
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I heard some talk over in Fidonet about plans for a "quasi"-synchronous
detector in the new Radio Amateurs Handbook, anybody know how it compares
to a regular sync detector or ECSSB tuning?

Russ



From [e-mail] Tue Sep 19 18:47:29 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!vixen.cso.uiuc.edu!ehsn10.cen.uiuc.edu!pz12235
From: [e-mail] (Paul Norman Zaremba)
Newsgroups: alt.radio.college,alt.radio.pirate,alt.radio.talk,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: PHONE TAP: YOU MEAN PHONE PATCH!
Date: 17 Sep 1995 23:31:06 GMT
Organization: University of Illinois at Urbana
Lines: 20
Message-ID: <43ib3q$[e-mail]>
References: <42j92t$[e-mail]> <42qejj$[e-mail]> <42qhgi$[e-mail]> <43512b$[e-mail]> <43735c$[e-mail]> <[e-mail]>
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Xref: grape.epix.net alt.radio.pirate:10105 rec.radio.amateur.homebrew:9504 rec.radio.amateur.misc:86613

Yes, on WLS AM 890 in Chicago, they consistently admonish callers to turn
their radios down, while they stutter and hesitate as you hear the delayed
audio from the radio into the phone, and so on...

And, all theoretical pontifications aside, I have done this with a reasonable
degree of success.

My voice doesn't drown out the caller because I don't talk directly into the
mouthpiece. It is the low-tech way to go, especially if one doesn't have the
resources to obtain a hybrid, much less a digital delay.

And it's also quite difficult to get feedback, once again verified through
my field trials. The caller has to hold the phone receiver quite close to
the stereo speaker to get feedback.

--
           *** Paul Zaremba - Product Engineering - TDM, Inc. ****
                       Urbana, IL / State College, PA
     RF Devices, Photonics, SCoPTiC, AL/TENS, AV Processing and more....
                          email: [e-mail]


From [e-mail] Tue Sep 19 18:47:31 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!wa2ise
From: [e-mail] (Robert Casey)
Subject: Modiying an old tube AM radio with pencil tubes, results
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Date: Mon, 18 Sep 1995 02:09:17 GMT
Lines: 48
Sender: [e-mail]


I have a few "pencil" tubes, or "sub-mini's" as they are called.
Mostly from mil surplus stuff.  These are about a 1/3 inch diameter
and about 1 1/2 to 2 inches tall, one style has 8 pins in a circle,
another style is 5 or 7 pins in a straight row.

I've thought of using some of these sub-mini tubes in an AM BC band
radio, like the old AC/DC "AA5" tube radios.  So I took an
otherwise ordinary AA5 tube radio (AA5 = "All American 5 tube")
and decided to modify it to use some pencil tubes.  First mod was
to change the IF amp tube (12BA6) to a 5840, which came out of
a mil IF strip, guessing it would work in the AM radio.  And it
actually did work, though I found I needed a tube shield to keep it
from oscillating.  Worked well, actually, maybe a bit better than
the 12BA6 did.  I measured the heater current with a DVM and a 6.3
volt supply, and it was close to the 150mA of the AA5 heater string.
Checked it in the radio, voltage a bit high, so I paralleled a 330
resistor to get the voltage and current to spec.

A few days later...:

The AA5 tube radio I modified with a 5840 sub-mini tube in the IF stage
recieved some more sub-mini tubes today.  This time I replaced the
12AV6 det and 1st audio tube.  With two triodes, 5703's.  I also
had some twin triode sub-minis, but a restriction I had to adhere to
is that the heater current should be around the 150 ma of the AA5
string.  One of the triodes became the 1st audio stage (50C5 driver),
with a grounded cathode and self-biasing grid.  It draws a bit more
b+ current than a 12AV6 does, as the voltage on the plate measured
about 18V, but it sounds fine.   And enough gain.  The other triode
became the diode detector.  Cathode grounded, plate grounded, grid
tied to the IF transformer.  A tube knowlegdable friend suggested the
grounded plate, to act as an RF shield to keep the harmonics of the
rectified 455KHz IF signal from causing tweets at 910Khz radio stations.
Couldn't find any tweets there yet tonight, tommrow I'll try a daytimer
station at 910.  I used a wire wrap socket, and needed to spread the
leads on the 5703's a bit (didn't have any proper in line tube sockets).
Bent the wire wrap posts to reach the tube socket holes on the AA5's
circuit board.

Radio is working well, here in northern NJ, I'm listening to "84 WHAS"
which I think is in the South somewheres, near an Interstate 65 or such.
Propagation must be pretty good tonight.

The AA5 design must have been an excellent design job, to take the above
"crude" mods, and still work well.




From [e-mail] Tue Sep 19 18:47:32 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!vixen.cso.uiuc.edu!uchinews!gw2.att.com!gw1.att.com!news.bu.edu!acs4.bu.edu!toyo
From: [e-mail] (Toyo Cheng)
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorola Director voice pager...
Date: 18 Sep 1995 03:47:14 GMT
Organization: Boston University
Lines: 22
Message-ID: <43iq42$[e-mail]>
NNTP-Posting-Host: acs4.bu.edu
X-Newsreader: TIN [version 1.2 PL2]

Hi!

Could anyone tell me how to modify Motorola 'Director' voice pager?
It's frequency is tuned to 462.825MHz and it has 18.49480Mhz X'tal.
It seems it's IF is 450KHz.  Local OSC seems like 462.375MHz(?) generated
by 18.4948Mhz X'tal... 462.825MHz-462.375MHz=450Khz??

If anyone know how to calculate the X'tal frequency in order to bring
down to hamradio band, please let me know!

It has two mechanical resonace to open or turn on the voice. (533.9 hz &
600.9 hz) (two-sequence-tone-decoder.)  I felt the age of the receiver, it
only contains two ICs and a lot of transistors. Anyone know what is
M6778 and 79G08 ICs for?

Or, if you have any information regarding to the voice pager, please let
me know!!

Thanks in advance.

Toyo
[e-mail]


From [e-mail] Tue Sep 19 18:47:33 1995
Path: grape.epix.net!news.sprintlink.net!usit.net!usenet
From: [e-mail] (Starchild (Samantha))
Newsgroups: rec.radio.amateur.homebrew
Subject: set-down slanted instrument consoles (like NASA uses)
Date: Mon, 18 Sep 1995 05:01:02 GMT
Organization: Romper Room
Lines: 11
Message-ID: <43iufq$[e-mail]>
NNTP-Posting-Host: 199.1.57.34
X-Newsreader: Forte Free Agent 1.0.82

Does anyone know of a mail-order company that sells them, prefer
used---- money is tight. Want one to build a mega-B.S. Box into.

Thanks
Samantha

If you need to ask what a NASA console is, send me an "E" at my
address and I will send you an encoded line drawing of what I'm
talking about.\




From [e-mail] Tue Sep 19 18:47:34 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: crystal drive specs  How to measure?
Date: 18 Sep 1995 05:09:51 GMT
Organization: Hewlett-Packard
Lines: 48
Message-ID: <43iuuv$[e-mail]>
References: <43evsb$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <43evsb$[e-mail]>, PTracy <[e-mail]> wrote:
>Here we go with project #12554.  I have built several crystal oscillators
>mostly of the colpitts and pierce variety.  One spec that I never complety
>understood is Drive power to the crystal.  My usual approach to setting
>"drive" is to adjust feedback by whatever means that seems to work to a
>point where the oscillator doesn't start some times, and then back up.  I
>can measure ESR in a roundabout fasion using a signal genertor, a
>resistor, and a FET probe.  I no longer have access to a vector voltmeter
>or crystal impedance meter.  I can and have measured crystal current using
>a Tektronix current probe.  I am just not sure how to go about calculating
>the crystal drive to make sure it's within acceptable limits.  Is it as
>simple as I^2 * esr?  Nahh, couldn't be.  Unless I am mis-using the

Yes it is that simple.  Be sure to excite the crystal at the specified
drive power when characterizing its ESR, because ESR is itself affected
to some extent by drive power.

>current probe, the current and voltage are nearly 180 deg out of phase.

If the crystal is being operated in "parallel" resonant mode, it will
look mostly inductive, so the current and voltage are 90 degrees out of
phase.  The thing to do is measure current and ESR and forget about
voltage.

>If one applies ac power triangle formulas, then the TRUE power is much
>much less than the apparent power, with reactive power being almost equal
>to apparent power.  Any help?
>
>Thanks, Pat - KE1C

Most oscillator designs subject the crystal to rather high drive levels
(several mW.).  The easiest way to avoid this problem is to either run
the oscillator on a very low voltage supply, such as 3 volts or put
clamping diodes on the collector to limit the voltage swing.  Otherwise,
you're stuck with using small capacitors in the circuit which decreases
the stability.  In the high precision oscillators we make here at
the Hewlett Packard Santa Clara division, we run the crystals at 40
microwatts to minimize phase noise, but the crystal people tell us
they consider that an astronomical amount of power and wish we could
hold it down to 1 microwatt!  In the high precision oscillators, we
use an AGC circuit to precisely set the drive power.

Rick Karlquist, N6RK
[e-mail]






From [e-mail] Tue Sep 19 18:47:35 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!newsxfer.itd.umich.edu!agate!tcsi.tcs.com!uunet!in2.uu.net!utcsri!newsflash.concordia.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03
From: VE4KLM <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Is someone deleting my posts ?
Date: Mon, 18 Sep 1995 09:11:46 -0500
Organization: The University of Manitoba
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: access.mbnet.mb.ca
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


I have been a fan of this newsgroup for a little while now and truly
appreciate the technical knowledge that is so prevalent here. I find
that I can get some very good answers to questions about antenna
design, etc.

I find however, that my posts may last no more than a week, or even
several days at most. Does this newsgroup get 'wiped' once a week,
or what ? I have legitimate questions to ask, so why are they getting
removed so quickly ? If anyone can help me, please do.

Regards,

Mike
VE4KLM


 ---------------------
|  SLM Software Inc.  |
| [e-mail] |
 ---------------------



From [e-mail] Tue Sep 19 18:47:36 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!homer.alpha.net!uwm.edu!spool.mu.edu!howland.reston.ans.net!agate!tcsi.tcs.com!uunet!in1.uu.net!ftpbox!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: Re: (HELP)CORE CHOICE FOR COIL DESIGN
Reply-To: [e-mail]
Organization: Motorola Satellite Communications
Date: Mon, 18 Sep 1995 14:11:17 GMT
Message-ID: <[e-mail]>
References: <432osg$[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
Lines: 32

: ;  I am working on a radio design for thru the ground radio using coils as the
: ;  receiver and transmitter antenna.
: ;
: ;  I need a impedance matching transformer between the coil and the receiver. The
: ;  problem is that I need a very high al value (Large amount of inductance).
: ;
: ;  Powder Iron toroids are out of the question because of size. My other choice
: ;  is a ferrite pot core made by Amidon which is type material 77. It is of the
: ;  right size and will accommadate the windings. This material is primarally used
: ;  at higher frequencies than the 31 KHZ I wish to use.
: ;
: ;  Will this type of core material (type 77) cause excessive core loss (poor
: ;  sensitivity due to core loss at receiver impedance match) at the frequency I
: ;  wish to use on receive (31KHZ).
: ;
: ;  If so, Then can you suggest another core manufactor and type material.
: ;
: ;  Danny Britton
: ;  [e-mail]

: The type 77 pot core is a good choice for this application. Use one which does
: not have a gap.


You might just use a FET buffer to perform the impedance transformation.  Since the
gate input impedance is very high, just hang a resistor to ground from the gate to set
the termination reistance.  The impedance at the drain can be much lower, or you can
use the FET as a source follower and have the source resistor match the receiver input
impedance.

- Dan WB0NVB



From [e-mail] Tue Sep 19 18:47:37 1995
Path: grape.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newshost.marcam.com!usc!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Kent Ogletree)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for PIN diode switching info
Date: 18 Sep 95 19:08:49 GMT
Organization: ucsd usenet gateway
Lines: 20
Message-ID: <Pine.3.89.9509181245.A18566-0100000@kings>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

> I'd like to try pin diode switching in a homebrew 2-meter amp.  Are there
> pin diodes that can handle 40 watts at that frequency?  How about 150
watts?
> What are some part numbers used for higher power levels.  The 95 ARRL
> Handbook shows an example of receive filter switching, but that's about it.
>
> 73...Jim  N2VNO

Hi, Jim

Call micro-semi Corp. and ask for publication PD-600. It is the PIN Diode
Designers Handbook and is VERY handy. And yes PIN diodes can work in
Power Amps up to 1K Watt!

In my last post I FORGOT ;-) the number to Micro-semi. it is 1-617-926-0404

        -- 73 --
           Kent
           KD6NHP



From [e-mail] Tue Sep 19 18:47:38 1995
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!nntp.crl.com!pacbell.com!gw2.att.com!nntpa!zeus!jkbe
From: jkbe@zeus (John_Bednar)
Subject: Re: Radio for 9600 baud@UHF
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Sender: [e-mail] (Netnews Administration)
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Organization: AT&T
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References: <4332ef$[e-mail]>
Date: Mon, 18 Sep 1995 20:52:59 GMT
Lines: 8
Xref: grape.epix.net rec.radio.amateur.digital.misc:10494 rec.radio.amateur.homebrew:9512


We use the TEKK data radio's.

Their phone number is: (816)-746-1098. I believe you must purchase
through a distributor now.

John



From [e-mail] Tue Sep 19 18:47:39 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (KE4IOF)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ten Tec T-Kits
Date: 18 Sep 1995 23:38:11 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <43ldv3$[e-mail]>
References: <43l9it$ko4$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

I talked today to someone at Ten Tec about their T-Kit line. Actually I
placed an order. Anyway, Ten Tec is still firmly behind their kit line
even though they never advertise, and the latest catalog I have is over a
year old.

I guess we've all heard about the impressive 2meter radio kit Ten Tec was
to release over a year ago. Believe it or not, it has still not been
released. The gentleman on the phone said they were still trying to work
some problems, but were hoping to release it soon.

Has anyone built any of their kits before?

Mark, KE4IOF


From [e-mail] Tue Sep 19 18:47:40 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!news.dacom.co.kr!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Old Man <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Cleaning Hamshack Sale..
Date: 19 Sep 1995 02:23:25 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 57
Message-ID: <43l9it$ko4$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.homebrew:9513 rec.radio.swap:43324

Shack cleaning sale again revised!  Gotta make room for more stuff
coming in.

FOR SALE or TRADE:   Stoddard AN/PRM-1 Radio Test Set.  With
storage trunk for receiver, adaptors.  Also have Remote indicator assy
and AC power supply, but NO storage trunk for them.  This is an RFI
(Or in modern language "EMI") receiver.  It has the capability of
measuring Field Intensity in microvolts per meter via a whip antenna
or a loop antenna.  VERY handy for finding interference sources,
measuring field strength etc. in the range 150 khz to 25 Mhz in 7
bands. I also have the original Technical manual/Depot manual.
These are fairly rare, I have only heard of one other one in the
last 25 years.  They have been largely superceded by the more modern
Stoddart solid state version.  (Tucker had them for around $5000!!!)
Will sell for $250 plus packing/shipping

GENERAL RADIO Model 650 'Antique' Impedance bridge, Cosmetically fair
to good.  Works!  Measure L/C/R.  Sell for $50 plus shipping/packing.

GENERAL RADIO Model 1330A Bridge Oscillator.  15 Khz. thru 50 mhz
in 8 bands.  Working OK, cosmetically good.  Sell for $60 plus
shipping/packing.

GENERAL RADIO Megohmmeter model 1862C in excellent condition and
working.  Missing only two small 'latches' in lid locking system
which does not affect operation.  $75 plus shipping/packing.

GENERAL RADIO 722-MD Precision Variable Capacitor, absolutely in
mint condition with fitted wood carrying case. $100 plus packing/
shipping.

Heathkit IT-2250 Autoranging capacitance meter, excellent condition,
$50 with manual plus shipping/packing.

Heathkit QM-1 "Q" meter, works OK, well worn condition, $30 with
manual plus packing/shipping.

Heathkit IG-42 Laboratory Generator, covers 100 khz-30 Mhz., With cable
works fine, good cosmetic condition.  $30 plus shipping/packing.

Heathkit IB-2 Impedance Bridge.  Measures L/C/R.  Well worn
condition, works OK, with manual.  $30 plus shipping/packing.

ICOM IC-R1 pocket receiver.  Covers .1-1300 mhz., AM/FM/wideband FM,
have original box, carrying cases, rubber duck and additionally BP-83
NiCad battery, BP-90 dry battery box, BC-72 desktop charger, and R1
service manual.  Have about $800 invested.  Will sell for $400 plus
shipping/packing.  THIS IS NOT THE "BLOCKED" MODEL, it covers all
the cellular channels!

Trade?  I am looking for the following:  Hallicrafters SX-88 receiver,
Hallicrafters SX-100 (late Mark), Hallicrafters SR-75 Transceiver,
Heathkit IP-17, SP-17A or IP-32 power supply all in good condition
or better.

Sandy, W5TVW Internet:[e-mail]



From [e-mail] Tue Sep 19 18:47:41 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!hookup!noc.tor.hookup.net!gatewest!usenet
From: [e-mail] ([e-mail])
Newsgroups: rec.radio.amateur.homebrew
Subject: URGENT URGENT: NEED 2SK291 SEMICONDUCTOR
Date: Tue, 19 Sep 1995 03:55:12 GMT
Organization: Gate West Communications, Winnipeg, Manitoba, Canada
Lines: 5
Message-ID: <43lbhn$[e-mail]>
NNTP-Posting-Host: ppp71.gatewest.net
X-Newsreader: Forte Free Agent v0.46

Please,
if anyone knows where to find this semiconductor: 2SK291 write at:
[e-mail].
Thanks, a.s.



From [e-mail] Tue Sep 19 18:47:42 1995
Path: grape.epix.net!news.sprintlink.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Spice Simulator
Date: Tue, 19 Sep 95 08:13:04 PDT
Organization: Northwest Nexus Inc.
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: blv-pm1-ip6.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


I've seen several requests on this group for information about free
or inexpensive Spice simulator programs.  I just came across a
notice of an evaluation copy of spice, including schematic entry,
and graphics post processor from Intusoft.  These are evaluation
copies for PC/Windows based computers.

Can be downloaded via ftp from "ftp.iee.ufrgs.br", which I believe
is a site in Brazil.

There is also mention of a compuserve forum that may also include
the software:  Go CADDVEN  .. Library 21

I haven't checked either site to confirm, but good luck....

73 de KI7RH (Jay)




From [e-mail] Tue Sep 19 18:47:42 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HV supply chokes
Date: 19 Sep 1995 15:35:27 GMT
Organization: UniSQL, Inc.
Lines: 13
Message-ID: <43mnvv$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

Peter Dahl is a good source for HV transformers and chokes.

Things to consider:
additional filter caps may be cheaper than a filter choke, and will definitely
    weigh less
if you put the filter choke in the negative leg, you remove the requirement
    for HV protection and reduce/eliminate the need for a dielectric standoff
you may be able to find a big filament transformer whose primary winding
    provides sufficient inductance for your application.

Jim N6OTQ




From [e-mail] Tue Sep 19 18:47:44 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sgigate.sgi.com!bridge2!Isis.st.3com.com
From: [e-mail] (Peter Simpson)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Homemade TNC schematics avaiable
Message-ID: <[e-mail]>
Date: 19 Sep 95 18:40:48 GMT
References: <43k9sd$[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail]
Followup-To: rec.radio.amateur.digital.misc
Organization: 3Com Corporation
Lines: 14
Nntp-Posting-Host: 152.67.45.67
Xref: grape.epix.net rec.radio.amateur.digital.misc:10497 rec.radio.amateur.homebrew:9519

Thank you, Jesus!  I just downloaded the stuff, and will start
trying to build my own TNC.

73,
Peter

--
--

 Peter Simpson, KA1AXY       Linux!       [e-mail]
 3Com Corporation         The free Unix   [phone] voice
 Northborough, MA 01532    for the 386    [phone] fax




From [e-mail] Tue Sep 19 18:47:45 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!news.vcd.hp.com!news
From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AMATEUR RADIO GONE COMMERCIAL!!!
Date: 19 Sep 1995 20:34:17 GMT
Organization: Hewlett-Packard
Lines: 25
Message-ID: <43n9g9$[e-mail]>
References: <43kbvd$[e-mail]>
NNTP-Posting-Host: hpvcldu.vcd.hp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.05 9000/720)
X-URL: news:43kbvd$[e-mail]

Hi Gary OM,

  Hear hear!  I could not agree more, with your concerns about
commercialization of ham radio.  Also, the posts you have received so far
regarding the Dumbing Down of Ham Radio, QST, and our American culture in
general.
  I am almost at the point of canning my ARRL membership after 40 years. QST
now has "construction" articles in which all parts are listed as supplied by
the author, no theory of operation, no details of the software/firmware, etc.
Then it is nothing more than an advertisement, instead of an article.  Plus,
now
we are seeing many "articles" that are nothing more than advertisements for
ARRL
products like the "Radio Designer" software.   When I go back and browse
through
my QST collection, and review what QST was like 10, 20, 30, and more years ago,
it is readily apparent what has happened to QST in recent years.
  Remember, the ARRL is really a PUBLISHING house, and they will do whatever
the market demands to maximize their success in the PUBLISHING business, and to
attract advertisers.  That is why the "Equipment Reviews" have always been a
joke; they are often very incomplete and almost never say anything "bad" about
the equipment being reviewed, when in fact I have used the equipment and noted
many glaring design errors and performance or cost-effectiveness deficiencies
which were never mentioned in their equipment reviews.



From [e-mail] Fri Sep 22 13:30:04 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.amherst.edu!news.mtholyoke.edu!uhog.mit.edu!news.kei.com!simtel!oleane!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10 meter portable antenna plans wanted
Date: 21 Sep 1995 06:56:16 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 10
Message-ID: <43r2ag$[e-mail]>
References: <43q6jb$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

In article <43q6jb$[e-mail]>,
DedElvis01 <[e-mail]> wrote:
>I plan on a field trip and would like any suggestions for a small
>effiecient antenna for 10 meters, beams also. Thanks.
If you want a resonable efficiency, do not go for minibeams
and other small antennas, they are inherently poor.
(small refers to element length less than 1/2 wl.
Consider a cubical quad, or a HB9CV.




From [e-mail] Fri Sep 22 13:30:05 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news5.ner.bbnplanet.net!news3.near.net!news2.near.net!news.delphi.com!usenet
From: internet <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1500 redux
Date: Wed, 20 Sep 95 00:42:14 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: bos1b.delphi.com
X-To: Bob T. <[e-mail]>

I may be way off base here, but I was under the impression
that the main rush toward high drives and GG AB2
amplifiers was when the FCC decided they had to give 'type
acceptance' to commercial amps. The 100 watt drive level
fit with current transmitters without the need for step
attenuators, and it took just a few of the possibilities
away from the CB group.

Actually, back when we had to build our own equipment,
many a tetrode amp was built to work with a 10 watt
exciter. Done a few myself. What I'm trying to point out
here, is the prevalence of GG amplifiers was caused by
political rather than technical considerations.
K0UYH


From [e-mail] Fri Sep 22 13:30:06 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!news.service.uci.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: 50 ohm to 300 ohm converter
Date: 20 Sep 95 13:29:03 GMT
Organization: ucsd usenet gateway
Lines: 20
Message-ID: <9509201329.AA26500@dilbert>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

>Ok, I need to buid a 50 to 300 Ohm converter and I was curious as to how
> to go about it. If anyone has any ideas could you post them here or email
> me at [e-mail]
>
> Thanks much in advance.
>                               Joe
>
Joe-
     I believe what you need is a balun, which is used for matching
unbalanced 50 ohm coax to 'balanced' 300 ohm twinlead or the like.
Look in the October issue of Electronics Now (was Radio Electronics).
This contained an article that described the designing and building
of baluns.

Hope this helps you out!

73's

David
kb0nkw


From [e-mail] Fri Sep 22 13:30:08 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!cs.utexas.edu!natinst.com!news.dell.com!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: AMATEUR RADIO GONE COMMERCIAL!!!
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <43kbvd$[e-mail]>
Date: Wed, 20 Sep 1995 15:38:55 GMT
Lines: 37

In article <43kbvd$[e-mail]> [e-mail] (Gary V. Deutschmann, Sr.) writes:
>AMATEUR RADIO GONE COMMERCIAL!!!
>
>I recently picked up a new study guide for the Advanced Class test
>to prepare myself for taking the upgrade examination.
>
>While reviewing the question pool, as I neared the end of the list,
>I found two very disheartening questions, both of which the answers
>were related directly to proprietary data and information.
>
>I was so mad that I tore the book in half and threw it in the trash.
>
>As I no longer have the book, I can't put the two questions here, but
>the questions were related to antennas and the method of moments, which
>is definately proprietary information and has no place on the exam.
>
>How can such proprietary questions be put in the question pool and can
>I request a test that does not contain either of these two questions?

As far as I know, the method of moments is not a patented algorithm,
though of course many programs which use it are copyrighted works of
their authors. So I don't understand your beef. You could always calculate
using it by hand, or write your own program, if you don't want to buy a
commercial version. You'd expect to pay for a pen wouldn't you? Why should
you not expect to pay for a more complex computational tool? Of course
you *could* kill your own fowl for a quill, and dip it in your own blood
to write the exam, but I hardly think that reasonable. As technology has
advanced, so has the sophistication of the tools we use to work with it.
You don't want the exam *dumbed down* to the level where only hand
calculation is convienent do you?

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 Sep 22 13:30:09 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Re: AMATEUR RADIO GONE COMMERCIAL!!!
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Wed, 20 Sep 1995 18:09:01 GMT
References: <43kbvd$[e-mail]>
Nntp-Posting-Host: hplsnb.lsid.hp.com
Organization: Hewlett-Packard
X-Newsreader: TIN [version 1.1 PL9.4]
Lines: 30

Gary V. Deutschmann, Sr. ([e-mail]) wrote:

..

: While reviewing the question pool, as I neared the end of the list,
: I found two very disheartening questions, both of which the answers
: were related directly to proprietary data and information.

: I was so mad that I tore the book in half and threw it in the trash.

: As I no longer have the book, I can't put the two questions here, but
: the questions were related to antennas and the method of moments, which
: is definately proprietary information and has no place on the exam.

: How can such proprietary questions be put in the question pool and can
: I request a test that does not contain either of these two questions?

Maybe I'm being too damned analytical here, but how can I hope to carry
on a meaningful discussion about this if I don't know what the questions
were?  How do I know what you consider to be "proprietary"?  Do you
consider explanations about how electromagnetic radiation propagates to be
"proprietary"?  Do you consider discussions about how semiconductor
devices operate to be "proprietary"?  I believe that anything published
in a journal, book or dissertation is not "proprietary", and I also
believe that anything which is patented is not "proprietary" ... it is
_protected_ but not proprietary.  Part of the purpose of a patent is to
disclose the invention to the public.

de K7ITM



From [e-mail] Fri Sep 22 13:30:10 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!col.hp.com!bobw
From: [e-mail] (Bob Witte)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AMATEUR RADIO GONE COMMERCIAL!!!
Date: 22 Sep 1995 02:43:29 GMT
Organization: HP Electronic Measurements Division
Lines: 21
Message-ID: <43t7sh$[e-mail]>
References: <43kbvd$[e-mail]>
NNTP-Posting-Host: la.col.hp.com
X-Newsreader: TIN [version 1.2 PL2]

Gary V. Deutschmann, Sr. ([e-mail]) wrote:

: AMATEUR RADIO GONE COMMERCIAL!!!

: I recently picked up a new study guide for the Advanced Class test
: to prepare myself for taking the upgrade examination.

: While reviewing the question pool, as I neared the end of the list,
: I found two very disheartening questions, both of which the answers
: were related directly to proprietary data and information.

: I was so mad that I tore the book in half and threw it in the trash.

  <snip>

  Geez, I must have pushed the "rec.radio.amateur.policy button" since
  I'm clearly in the wrong newsgroup. Oops, no this really is
  "rec.radio.amateur.homebrew".


Bob Witte / [e-mail] / HP / EMD / [phone] / KB0CY / 7J1AUE


From [e-mail] Fri Sep 22 13:30:11 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!godot.cc.duq.edu!news.duke.edu!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.delphi.com!usenet
From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AMATEUR RADIO GONE COMMERCIAL!!!
Date: 21 Sep 1995 09:54:41 GMT
Organization: Delphi Internet Services Corporation
Lines: 36
Message-ID: <43rcp1$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
NNTP-Posting-Host: bix.com
X-Newsreader: NetBix 1.160
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] (Gary Coffman) wrote:
..
>>You don't need a 1st Class License issued in 1970 to work on anything made
>>in the 80's and 90's.  It's a waste of time, a waste of study.
>
>Well, lets just say it isn't cost effective. In the broadcast business
>today, most equipment has diagnostic self-test, and repair is replacement
>at the subsystem level. That may be the board level, or it may be the chip
>level considering the sophistication of today's chips. But it is a very
>different skill set from the discrete component days. That skill set isn't
>necessarily less either, but it is different. Today you need a systems
>engineering understanding more than you need a component level circuit
>understanding.

Of course if you're called to the 50KW transmitter to repair a blown final
amplifier tube it helps to have some basic rework skills, especially when
a moth sneaks into the cavity as you are putting it back together after
replacing the final amplifier tube. Such a thing tends to bring the final
down again REAL fast. And since nobody has any replacement chimneys to
replace the one with carbon scoring you get out a Dremel (tm) tool and carve
away the scoring and pray it still works. (This happened to a friend of mine
a couple/three years ago. Wotta mess!)

>
>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     |                     |

{^_-}     Joanne Dow     The Wizardess
          Quibbling again.... (With today's electronics yank and replace is
          MUCH more efficient than soldering iron and component debug.)



From [e-mail] Fri Sep 22 13:30:13 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!godot.cc.duq.edu!news.duke.edu!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.delphi.com!usenet
From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AMATEUR RADIO GONE COMMERCIAL!!!
Date: 21 Sep 1995 09:54:50 GMT
Organization: Delphi Internet Services Corporation
Lines: 63
Message-ID: <43rcpa$[e-mail]>
References: <43pnij$[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
NNTP-Posting-Host: bix.com
X-Newsreader: NetBix 1.160
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 <43pnij$[e-mail]>,
   [e-mail] (Gary V. Deutschmann, Sr.) wrote:
>In article <[e-mail]>, [e-mail] says...
>>
>>Gary V. Deutschmann, Sr. ([e-mail]) wrote:
>>
>>..
>>
>>: While reviewing the question pool, as I neared the end of the list,
>>: I found two very disheartening questions, both of which the answers
>>: were related directly to proprietary data and information.
>>
>>: I was so mad that I tore the book in half and threw it in the trash.
>>
>>: As I no longer have the book, I can't put the two questions here, but
>>: the questions were related to antennas and the method of moments, which
>>: is definately proprietary information and has no place on the exam.
>>
>>: How can such proprietary questions be put in the question pool and can
>>: I request a test that does not contain either of these two questions?
>>
>>Maybe I'm being too damned analytical here, but how can I hope to carry
>>on a meaningful discussion about this if I don't know what the questions
>>were?  How do I know what you consider to be "proprietary"?  Do you
>>consider explanations about how electromagnetic radiation propagates to be
>>"proprietary"?  Do you consider discussions about how semiconductor
>>devices operate to be "proprietary"?  I believe that anything published
>>in a journal, book or dissertation is not "proprietary", and I also
>>believe that anything which is patented is not "proprietary" ... it is
>>_protected_ but not proprietary.  Part of the purpose of a patent is to
>>disclose the invention to the public.
>>
>>de K7ITM
>>
>
>The questions were A9B09 and A9B10!
>Proprietary means either the product is copyrighted or patented and offered
>for resale by a private firm or organization and the contents of which are
>not freely distributed.
>No, in order to sell a new semiconductor, the manufacturer freely publishes
>the data sheets on same.
>You can feel that way if you want, but I hold three US Patents myself and my
>products are definately proprietary, meaning I don't allow anyone other than
>myself to produce or sell my products, however, I do publicize every single
>thing about my products in their respective patent abstracts.  But for
>seventeen years they are my proprietary product.
>You think so, most patents do not disclose the operation of any device, nor
>the exact manufacturing specifications.  Patents are usually generalizations
>to extend the scope and coverage of the device.  For example, one claim in
>Land's patent was, any device wherein the development process takes place as
>a result of or an action of the device or casual user.  That is why Kodak
>did not have a Polaroid type camera for 17 years.  It was totally
>proprietary to Mr. Land.
>
>TTUL - 73+ de Gary - N0ZOI
>

Now hold on there podnah - I seem to remember studying something called a method
of moments way back in the mid 60's in college antennas courses. Are you *SURE*
you researched prior art properly when making your patent claims?

{^_^}     Joanne Dow     The Wizardess



From [e-mail] Fri Sep 22 13:30:13 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Blown diodes
Date: 21 Sep 1995 15:31:59 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 8
Distribution: usa
Message-ID: <43s0hf$[e-mail]>
References: <43p6s0$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com
Originator: [e-mail]

In article <43p6s0$[e-mail]>,
Stephen Hawkins <[e-mail]> wrote:

>I can't make out any markings on the diodes.

Hi Stephen, more than likely, they are 1N34A's.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Fri Sep 22 13:30:14 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.delphi.com!uunet!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bulk Reply AMATEUR RADIO GONE COMMERCIAL
Date: 20 Sep 1995 22:40:37 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 24
Sender: [e-mail]
Message-ID: <43qjb5$[e-mail]>
References: <43qa5m$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <43qa5m$[e-mail]>, [e-mail] (Donald J. Miller)
writes:

> If you want theory, you
>better look elsewhere.  If you research one of the modern textbooks
>on *Electromagnetic Theory*, you should find a discussion on the
>method of moments.

Hi Don,

I'm still trying to understand what you all are yakking about.

I have EM and antenna theory engineering textbooks by Kraus, Jasik,
Jordan-Balmain, and Kuecklin along with general electronics and electrical
engineering books but I can't find anything about Method of Moments.

Can you tell me what the hell it is so I can join the fight too?<<grin>>

No seriously, what is it? It must be something to do with these
new-fangled computers and not in my old textbooks.

73 Tom




From [e-mail] Fri Sep 22 13:30:16 1995
Path: grape.epix.net!news.sprintlink.net!EU.net!uknet!dispatch.news.demon.net!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bulk Reply AMATEUR RADIO GONE COMMERCIAL
Date: Thu, 21 Sep 1995 08:42:24 GMT
Organization: IFWtech
Lines: 81
Message-ID: <[e-mail]>
References: <43pmqe$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Broken-Date: Thursday, Sep 21, 1995 08.42.24
X-Newsreader: Newswin Alpha 0.7

In article: <43pmqe$[e-mail]>  [e-mail] (Gary V. Deutschmann, Sr.) writes:


: As an antenna designer myself, I was surprised that the question first
: indicated that the program in question was a "commonly used computer
: program", so common I never heard of it.

If the questions had asked about "NEC, MININEC and related computer
programs", would that have helped? Because that's all they mean by
"Method of Moments".

I truly can't believe that anyone claiming to be an antenna designer
is unaware of these programs, or doesn't already use them intensively.

(On the  other hand, if you're the kind of person who never reads
 page 1 of the manual but jumps straight into the interesting stuff,
 then you might have missed the academic information that all these
 programs use the method of Moments  :-)

These programs are the biggest single development in antenna design
for decades - or maybe even the biggest development ever. No holder
of a recent Amateur Extra ticket should be wandering around in total
ignorance of their existance or importance.

: From the posts I have read thus
: far, apparently our Tax Dollars paid for it's inception and private
: companies are offering it for sale, making it even more proprietary than I
: originally suspected.

You can download free, fully working versions of NEC and MININEC, and
even the source code, from many academic ftp sites. You can order full
printed reports from NTIS for a few dollars more. There's even an
amateur-written beginner's FAQ for MININEC.

What you'll find is that both programs are very powerful, but
competely user-oblivious. People like W7EL and K6STI have put
thousands of hours into improving the user interface, adding
plot routines, streamlining the calcuations and taking some bugs
out of the original code. In other words, they have turned NEC and
MININEC into usable tools.

When you buy EZ-NEC for example, you're paying for all the
proprietary enhancements that make it "EZ" to use: you're not being
asked to pay for any of the original public-domain NEC code.

If you don't choose to buy an enhanced (read "usable") version,
you're completely at liberty to struggle on with NEC or MININEC -
or write your own enhancements.


Coming back to the exam question: OK, so you got a stupid answer
from whoever you chose to ask at ARRL - but that doesn't change any
of the above.

Now can someone please post a word-for-word copy of the questions
and answers, so we can see what all the fuss was about?

Don't be bashful - the questions aren't proprietary :-)



: Hypothetically, if 1 out of every 10 questions consisted of proprietary type
: information and this information cost you $29.95 to obtain, it would cost
: you well over $1,500.00 just to study for your upgrade.

Aw, c'mon Gary! Something about these two questions has "pushed
one of your buttons" and provoked a fury that is totally out of
proportion. We all have these buttons, and some of them are marked
"Amateur Radio". (Me too: I'll confess to having hurled RSGB's Radio
Communication Handbook across the room  :-)

It's time to press "Reset".


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



From [e-mail] Fri Sep 22 13:30:19 1995
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: Bulk Reply AMATEUR RADIO GONE COMMERCIAL
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <43pmqe$[e-mail]>
Date: Fri, 22 Sep 1995 01:52:50 GMT
Lines: 95

In article <43pmqe$[e-mail]> [e-mail] (Gary V. Deutschmann, Sr.) writes:
>The two questions in the Advanced Question Pool, as many of you figured out
>are, A9B09 and A9B10.  The first asks "What type of computer program is
>commonly used for modeling antennas?" and the second "What is the principle
>of a "Method of Moments" analysis?"
>
>As an antenna designer myself, I was surprised that the question first
>indicated that the program in question was a "commonly used computer
>program", so common I never heard of it.  From the posts I have read thus
>far, apparently our Tax Dollars paid for it's inception and private
>companies are offering it for sale, making it even more proprietary than I
>originally suspected.

NEC was developed at public expense, and is available, including source
code, for free, on the net and elsewhere. NEC isn't very user friendly,
however, and several companies package the NEC engine in a friendly user
interface and sell the result. You're paying for "user friendly" not for
NEC. If you can live without point and click, you can run good old mini-NEC
for only the cost of downloading the bits. There's nothing even remotely
proprietary about it.

Since NEC seems to be so widely used among professional antenna designers,
and examples of NEC plots so widely published in professional papers, it's
*very* surprising you, as a self-proclaimed antenna designer, didn't already
know about it. And that's all the exam question, A9B09, is trying to determine,
your knowledge of the *existance* of a common antenna design tool. The other
question is trying to determine if you understand a very common numerical
methods technique. To the computer literate, this is akin to asking how do
we arrive at 2+2=4 (though honestly the latter is a tougher question to
answer properly).

>In my course of study to upgrade to Advanced Class, I try to find out
>everything I can about the questions posed in the exam.  When I tried to
>find out about the "Method of Moments" I initially found nothing about it.
>I purchased "The ARRL ANTENNA Book" along with a disk containing the
>computer programs they offer.  After reading the book cover to cover and
>finding nothing mentioned about the "Method of Moments Computer Program", I
>contacted the ARRL about this supposedly "commonly used computer program"
>and was informed that I would have to order it for a specific price.
>Until today, I just figured it was the property of the ARRL, now I find many
>different private enterprises have claimed something our tax dollars already
>paid for.

You'd have had better luck finding out about the method of moments
in a numerical methods textbook. It's a classic algorithm for doing
piecewise numerical integration, a form of the Newton-Cotes method.
It's a widely used technique in mechanical engineering, as well as
in electromagnetic modeling. It's not specific to antennas.

As an aside, the ARRL antenna books are *cookbooks*, you didn't really
expect to find anything to do with *theory* in there did you?  (This is
a really serious failing, and one that I've railed about before. With
antennas and EM radiation such an important part of amateur radio, the
ARRL publishes *nothing* that explains the theory of how antennas generate
EM fields.  Sure, they devote an entire chapter to transmission line
calculations in the Handbook, but when it comes to antennas they are
merely descriptive and only offer cookbook recipes for a limited subset
of radiators without a word of explanation of *why* they work.)

>In any case, both of the questions presented in the current question pool
>are directly contrary to the FCCs goal of giving the public the best
>possible service at minimal cost.

Service? The tests are to determine your competency in the field.
If you aren't even aware of a widely used tool's existance, the
test seems to be doing its job of weeding out the incompetent, or
more politely, of serving to lead you to discover valuable and
widely used techniques you were not yet aware existed.

>There are currently 582 questions in the Advanced question pool.
>Hypothetically, if 1 out of every 10 questions consisted of proprietary type
>information and this information cost you $29.95 to obtain, it would cost
>you well over $1,500.00 just to study for your upgrade.

Oh, please. In any educational setting you expect to pay for the
information and tools you are gaining. You buy books, pens, paper,
calculating tools, pay tuition, etc. That doesn't make the knowledge
you gain proprietary. A computer program is no different than a
slide rule, it's just a calculating tool, and you don't *really*
expect such tools to be *free* do you? In this case, NEC really
is free, in the sense that it was already paid for by all our taxes,
but that's really an exception. Should the exam not have questions
about the tools commonly used in the field? Remember, you don't
have to own a copy of NEC to answer the question. All is expected
is that you be aware that it *exists* and is in common use by
antenna designers. That's no different than a question that asks
what instrument do you use to measure VSWR. You don't need to go out
and buy a reflectometer to answer the question.

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 Sep 22 13:30:20 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.drexel.edu!news.ge.com!ctrlnews.erie.ge.com!news.crd.ge.com!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!usenet.cis.ufl.edu!usenet.ufl.edu!freenet3.scri.fsu.edu!freenet1.scri.fsu.edu!cwixson
From: [e-mail] (Chuck Wixson)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.misc
Subject: Re: Change WBFM to NBFM????
Date: 11 Sep 1995 17:18:31 GMT
Organization: Tallahassee Free-Net
Lines: 9
Message-ID: <431r17$[e-mail]>
References: <42e92l$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.homebrew:9538 rec.radio.amateur.equipment:17152 rec.radio.amateur.misc:86721

I have a few of those RT-68's and have fun using them just the way
they are.  Talk lightly and the nbfm'ers can hear you, or talk loud to
another rt-68 and its the only thing that will hear you. you'll get
used to limiting the audio.  Any-way , thats how i use mine. Also have
a few rt-67's and rt.70's.  Want to convert the 70's to cw.

See-Ya

Chuck, WD8DTH, MICHIGAN


From [e-mail] Fri Sep 22 13:30:21 1995
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: Composite-->RGB schems?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <43ltmr$[e-mail]>
Date: Wed, 20 Sep 1995 15:27:13 GMT
Lines: 31

In article <43ltmr$[e-mail]> [e-mail] writes:
>Looking to convert a composite signal to an RGB (ie: video out -> VGA
>monitor, w/o PC intervention).  If you know where I can find a schem,
>could you email [e-mail]?   Thanks!

What you need is the video subsystem of a TV to do this. That's usually
a single chip in modern TVs. Motorola and others make these chips, and
have application notes for how to use them, or you can just buy a SAMS
for a TV using one of these chips and copy their circuitry.

The basic problem is that composite video (we assume NTSC) is a complex
waveform encoding luminance information in a baseband analog fashion
while encoding hue information in the phase of a 3.58 MHz subcarrier
and color saturation information in the amplitude of that subcarrier.
You have to recover the phase and amplitude information from the
subcarrier, and combine that with the luminance information in a
decoder matrix to get RGB. Every TV ultimately has to do this in
order to drive the RGB guns of the CRT, so every set has the proper
decoding matrix implemented. The only difference for your application
is in how you apply sync, and in the levels you apply to the VGA monitor
(again we assume a multisync monitor capable of supporting TV sync
rates). Those issues are easily addressed via simple resistor networks
once you've broken the composite signal down into H sync, V sync, R,
G, and B with the TV video subsystem chip.

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 Sep 22 13:30:22 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!uunet!in2.uu.net!fred.interval.com!burdick.interval.com!user
From: [e-mail] (wayne burdick)
Newsgroups: rec.radio.amateur.homebrew
Subject: custom crystal suppliers besides ICM, JAN?
Date: Thu, 14 Sep 1995 16:13:00 -0800
Organization: interval research
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: burdick.interval.com

I heard there may be less expensive alternatives to ICM and JAN for custom
crystals.   There was mention of a manufacturer in San Diego.   Any
infomation would be appreciated.

Wayne,
N6KR

[e-mail]


From [e-mail] Fri Sep 22 13:30:23 1995
Path: grape.epix.net!news.sprintlink.net!nwnews.wa.com!news.halcyon.com!usenet
From: "Gary P. Fiber" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DSP
Date: 22 Sep 1995 12:35:54 GMT
Organization: Northwest Nexus Inc.
Lines: 5
Message-ID: <43uaja$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blv-pm10-ip7.halcyon.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 32bit)

A good group to look into is comp.dsp.  All they chat about is DSP chips
and FFT's, assembly language etc.  Sometimes a TI rep shows up there too.

73' Gary Fiber  KF7XV



From [e-mail] Fri Sep 22 13:30:24 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Bill Fuqua)
Newsgroups: rec.radio.amateur.homebrew
Subject: Heathkit HO-5404 station monitor Manual needed
Date: 21 Sep 95 15:17:14 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

  I picked up an uncompleted Heathkit HO-5404 station monitor at an hamfest.
It seems to have all the components installed but some multi-conductor cables
are not completed.

  I need a manual so that I can complete the project.'

TNX
73
Bill ko4ww



From [e-mail] Fri Sep 22 13:30:25 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.drexel.edu!news.ge.com!ctrlnews.erie.ge.com!news.crd.ge.com!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!van-bc!unixg.ubc.ca!rover.ucs.ualberta.ca!tribune.usask.ca!news.sasknet.sk.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03
From: VE4KLM <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Help me build 80m helical vertical
Date: Fri, 15 Sep 1995 15:47:09 -0500
Organization: The University of Manitoba
Lines: 31
Message-ID: <[e-mail]>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


Due to limited space on my city propery, I have considered building a
helical vertical for 80 m. I have seen a similar design for 160 meters
but there are a few things that confuse me. I hope you can help me...

They say for 160 m, to get a 20-25 ft length of PVC pipe and wrap HALF
a wavelength of wire on the full length of the pipe. They then say that
this will give you a QUARTER WAVE resonant vertical. Does that mean if
I use a FULL wavelength on a 50 ft length of PVC pipe, that I can have
a HALF WAVE resonant vertical ? If so, does this mean I will not need
the ground radials for the HALF WAVE version. Naturally both versions
are end fend and tuned at the bottom for the best SWR. A capacitive hat
is placed on top to prevent the 'tesla' affect, so to speak.

I have no experience at all with helicals so ANY useful info would be
nice. By the way, if there is a way for me to avoid use of ground radials
with a vertical helical, then please tell me how to do this. I do not
have the room either for spreading wires all over my yard, and using the
water or sewer lines may or may not work. I need something dependable and
efficient, since I am running QRP (in the 1/4 watt region).

Regards,

Mike
VE4KLM
Winnipeg ARES Group

 ---------------------
|  SLM Software Inc.  |
| [e-mail] |
 ---------------------


From [e-mail] Fri Sep 22 13:30:26 1995
Path: grape.epix.net!news.sprintlink.net!news.dgsys.com!sloth.swcp.com!pagesat.net!news.uoregon.edu!vixen.cso.uiuc.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: Help with new Pirate Radio in S. FL.
Date: 13 Sep 1995 22:12:17 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 34
Sender: [e-mail]
Message-ID: <438321$[e-mail]>
References: <437r7s$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <437r7s$[e-mail]>, Victor DeVore <[e-mail]>
writes:

>
>A friend of mine and I are going to start a radio station.  We
>want to pump out about 15-20 Watts, or at least enough to get
>me 6-12 miles, VERY CLEARLY, and in Stereo.  I will need an
>antenna too, and a power supply.  As of now, Im looking at a
>new 15 watt stereo transmitter.  It costs $469.00, but than I
>need to get a good antenna for $70.00, and then I need the
>power supply, for $60.00 (according to a buddy).  Thats quite a
>bit of cash for a 15 watt signal.  If someone has any help and
>suggestions, and especialy equipment, I would appreciate it.
>Please... no kits, Im not too good with that kind of stuff.
>
>--
>Victor DeVore

Victor,

I can give you the address of a place that sells equipment very cheap.
Write to my friend Bill English at Equipment Authorizations, Box 429,
Columbia, MD. 21045.

Be sure to put attn Bill English on the envelope, and enclose an SASE.
Just tell him what you want to do and that you are looking for some cheap
surplus equipment. They work out of a post office but you can trust them.
Their company has been dealing with radios for 60 or 70 years now. He'll
either handle your request or put you in contact with someone that can
take care of you.

Tom

Tom


From [e-mail] Fri Sep 22 13:30:27 1995
Path: grape.epix.net!news.sprintlink.net!news.icon.net!okc150.icon.net!ssampson
From: [e-mail] (Steve Sampson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with new Pirate Radio in S. FL.
Date: Wed, 20 Sep 1995 21:40:08
Organization: (ICON) InterConnect Online, Inc.
Lines: 21
Message-ID: <[e-mail]>
References: <437r7s$[e-mail]> <438321$[e-mail]>
NNTP-Posting-Host: okc150.icon.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <438321$[e-mail]> [e-mail] (W8JI  Tom) writes:

>A friend of mine and I are going to start a radio station.  We
>want to pump out about 15-20 Watts, or at least enough to get
>me 6-12 miles, VERY CLEARLY, and in Stereo.  I will need an
>antenna too, and a power supply.  As of now, Im looking at a
>new 15 watt stereo transmitter.  It costs $469.00, but than I
>need to get a good antenna for $70.00, and then I need the
>power supply, for $60.00 (according to a buddy).  Thats quite a
>bit of cash for a 15 watt signal.  If someone has any help and
>suggestions, and especialy equipment, I would appreciate it.
>Please... no kits, Im not too good with that kind of stuff.

Call me anytime after 8am Eastern and I can help you "I'm with
the Government."

---
Steve Sampson
FBI/Federal Codes Division
1-800-IM-SNITCH



From [e-mail] Fri Sep 22 13:30:28 1995
Path: grape.epix.net!news.sprintlink.net!news.rain.org!marvin
From: [e-mail] (Marvin Johnston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help: Find Design Solution for application
Date: 21 Sep 1995 18:34:17 GMT
Organization: RAIN Public Access Internet (805) 967-RAIN
Lines: 9
Message-ID: <43sb79$[e-mail]>
References: <43s915$[e-mail]>
NNTP-Posting-Host: [e-mail]
X-Newsreader: TIN [version 1.2 PL2]

PFZouave ([e-mail]) wrote:
: I am working on a microprocessor based device for a medical application.
: What I need is a simple circuit to detect proximity of the device to the
: human body -- in other words, a binary (go/no go) indication if the device
: is on the body or has been removed.

You might take a look at the Zircon electronic stud finder available in
hardware stores.  It appears to measure capacitance and has 4 or 5 LEDs
operating as a bar graph display.


From [e-mail] Fri Sep 22 13:30:29 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help: Find Design Solution for application
Date: 21 Sep 1995 13:56:53 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 35
Sender: [e-mail]
Message-ID: <43s915$[e-mail]>
Reply-To: [e-mail] (PFZouave)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am working on a microprocessor based device for a medical application.
What I need is a simple circuit to detect proximity of the device to the
human body -- in other words, a binary (go/no go) indication if the device
is on the body or has been removed.

I am thinking in terms of two small metal plates (which could actually be
pads on the circuit board itself) that constitute the plates of a large
air-capacitor. In theory, I think, an oscillator could be adjusted to
break into oscillation when the value of the "capacitor" changes due to
the proximity of human flesh.

Another possibility would be to excite one of the plates with an
oscillator. The other plate would be connected to a rectifier and
comparitor. The comparitor would be triggered when rf coupling between the
plates increased (due to the presence of human flesh).

I can kluge something together on a breadboard that will do all this. But
what I need is an *optimum* design that can meet the following
specifications:

* First, the lower the parts count, the better.
* The more generic the parts, the better (for future production reasons).
* As low a current consumption as possible (device is battery powered)
* 3 volt supply max.
* Must provide a binary (on/off) output that can be connected to an i/o
pin of my         microcontroller (a PIC 16C74)
* For power conservation reasons, ciruitry should only "turn on" when
enabled by      a microcontroller i/o pin. (0 or 3 volts).

If you have tackled a similar problem, your input would be greatly
appreciated. Please E-mail responses directly to me. Thanks in advance.
[e-mail]
Pete Friedrichs
*** We don't inherit the earth from our parents, we borrow it from our
children ***


From [e-mail] Fri Sep 22 13:30:30 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (keeper)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help: Find Design Solution for application
Date: Fri, 22 Sep 95 05:04:36 GMT
Lines: 15
Message-ID: <[e-mail]>
References: <43s915$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (PFZouave) wrote:

>I am working on a microprocessor based device for a medical application.
>What I need is a simple circuit to detect proximity of the device to the
>human body -- in other words, a binary (go/no go) indication if the device
>is on the body or has been removed.

If this device will consist of two electrodes in contact with the skin,
then the simplest solution is to build the equivalent of a megohmmeter.
The output should be fed to a CMOS comparator, then to your controller.

73,

Jack  WB3U


From [e-mail] Fri Sep 22 13:30:31 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.voicenet.com!news.sprintlink.net!in2.uu.net!newsfeed.pitt.edu!godot.cc.duq.edu!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homemade crystal filters for SSB ?
Date: Sat, 16 Sep 1995 02:38:28 GMT
Organization: Duke University, Durham, NC, USA
Lines: 73
Message-ID: <43diaj$[e-mail]>
References: <43828v$[e-mail]>
NNTP-Posting-Host: async42.async.duke.edu
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (PSKH) wrote:


>Has anybody practical experience with home made 4 crystal  ladder filters
>for SSB ? This is what I am talking about:-


>I would appreciate any thoughts on the above


      Gernsback, the same guys that publish "Electronics Now!",
devoted a special issue to radios a year or so ago.  In it was plans
for a shortwave receiver that included a crystal filter like what you
unsuccessfully tried to post.  It was a six crystal ladder though. I
kept the issue for a "rainy day" and just a month ago I saw an ad from
Jameco where they were closing out 9.834 MHz crystals for 39 cents
apiece.  That was exactly the same frequency as the article I was
saving.

      So I got 20 of the crystals.  I have access to a network
analyzer at work that will measure things like crystals down to a
gnat's eyelash, so I plugged the crystals in and got their specs.  I
also have a copy of PSpice for my IBM-PC.  I simulated the crystal
filter based on the schematic shown in the magazine and the parameters
I measured for the crystals.  The resulting (simulated) bandpass and
attenuation specs that PSpice cranked out matched the magazine specs
to a "T".  I was amazed!  The author of that article had really done
his homework.

      The passband looked to me to be a little too wide for SSB
generation, but just fine for receiver work.  I suspect that some
other center frequency, most likely lower, would be necessary to
reduce the passband width to the 3 or 4 KHz needed for really good
unwanted sideband suppression.  Or that a change from a "ladder" to a
"lattice" circuit would be necessary in order to keep the frequency up
at 9.834 Mhz.

      The interesting thing about the PSpice simulation was the way it
showed me that the values of the caps in the circuit are *extremely*
critical if you want a smooth, ripple-free, top to the passband.  So
critical, that I suspect that you will need to use small trimmers and
adjust the values while you can see the response on an analyzer of
some sort.  This is because of the fact that even closely matched
crystals will have some variation in their specs.

      The typical values for the crystals I got from Jameco are:

        Inductance............6.9813 milliHenrys
        Capacitance "Ca".....37.5999 femtoFarads
        Capacitance "Cb"......8.3413 picoFarads
        Resistance............4.53   Ohms


      I'll *try* to post an ascii schematic here.  Please bear with me
if it doesn't look too good on *your* machine........


            |-----[R]---[L]---[Ca]----|
       -----|                         |------
            |                         |
            |-----------[Cb]----------|


      BTW, 37 femtoFarads is the same as 0.037 picoFarads.

      And, for somebody as old as I am, a picoFarad is the same as a
micro-micro-Farad.  8-)


      Jim "no sig" Meyer





From [e-mail] Fri Sep 22 13:30:32 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.voicenet.com!news.sprintlink.net!in2.uu.net!newsfeed.pitt.edu!godot.cc.duq.edu!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homemade crystal filters for SSB ?
Date: Sat, 16 Sep 1995 02:38:52 GMT
Organization: Duke University, Durham, NC, USA
Lines: 24
Message-ID: <43diba$[e-mail]>
References: <43828v$[e-mail]> <[e-mail]>
NNTP-Posting-Host: async42.async.duke.edu
X-Newsreader: Forte Free Agent 1.0.82

Leon Heller <[e-mail]> wrote:


>To calculate the caps. multiply the coefficients by 1/(2*PI*f*R)
>where f = xtal. freq. in Hz, R = I/O impedance in ohms. I keep meaning
>to do some experiments with some of the test equipment we've got at
>work, to see which is best. The above circuit needs good matching for the
>I/O impedances, I think ladder filters are much more critical than lattice
>filters in this respect.

        Hi Leon,

        If you have access to PSpice, and would like to see my network
simulation file, let me know and I'll post it here or E-mail it to
you.

        I was just about to order back issues of QST to get the original
articles about the design.  But now, thanks to your info about them
being included in W1FB's book, I'll just get that instead.

        Jim "no sig" Meyer





From [e-mail] Fri Sep 22 13:30:33 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!uunet!in2.uu.net!nntpgate.primenet.com!nntpdist.primenet.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: HTX100 schem or transverter mods??
Date: 11 Sep 1995 12:45:27 GMT
Organization: Primenet
Lines: 16
Message-ID: <431b17$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip044.phx.primenet.com
X-Newsreader: IBM NewsReader/2 v1.2
Xref: grape.epix.net rec.radio.amateur.equipment:17153 rec.radio.amateur.homebrew:9540

In <[e-mail]>, [e-mail] (Muenzler, Kevin) writes:
> [e-mail] (Joe Landis - Systems & Network Mgr) writes:
>
> -Hi,
> -Does anyone have a schematic for the Radio Shack HTX100 10 meter rig,
> -or has anyone added seperate low-level transmit and recieve?
> -I'd like to use mine for a 28mhz tunable if for a DEM 432 mhz IF
>transverter.
> -
> -Thanks,
> -Joe - AA3GN

        qrz.com has a large mods directory with text files, no schematics, that will
help. Check ftp.qrz.com or www.qrz.com. Or buy the cd-rom if all else fails.

Jim N7TCF


From [e-mail] Fri Sep 22 13:30:34 1995
Path: grape.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!pcies4.trl.OZ.AU!ddiamond
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HV supply chokes
Date: Wed, 20 Sep 1995 11:28:01
Organization: TRL
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pcies4.trl.oz.au
Keywords: Chokes
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]

 Winding-to-case breakdown isn't too critical, as I can mount the
>choke on
>a dielectric support.

From here cannot help with source of chokes. However, the voltage breakdown
requirement is considerably reduced by placing the choke in the negative
supply lead rather than the usual method where it is wired in the positive
side. Achieves the same thing.

73, Drew, VK3XU.  Telstra Research Laboratories.





From [e-mail] Fri Sep 22 13:30:36 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Re: HV supply chokes
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Wed, 20 Sep 1995 18:32:00 GMT
References: <[e-mail]>
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Drew Diamond ([e-mail]) wrote:
:  Winding-to-case breakdown isn't too critical, as I can mount the
: >choke on
: >a dielectric support.

: From here cannot help with source of chokes. However, the voltage breakdown
: requirement is considerably reduced by placing the choke in the negative
: supply lead rather than the usual method where it is wired in the positive
: side. Achieves the same thing.

Drew (and others) have pointed out that the insulation requirements in the
choke are reduced by placing it in the ground return lead.  But I'd like to
offer something a bit more quantitative on this.

First, I'd like to note that if you put the choke in the ground return
lead, now there is a different requirement for the insulation on the
_transformer_ secondary, since _it_ is floating.  It turns out to not be
too bad, but it's worth noting.

For the choke, since it will have the same current waveform through it,
it will have the same voltage drop.  But in normal operation of a choke
input filter, the peak voltage causes lower drop across the choke than
the min voltage point.  If the peak voltage is 3000, a properly
operating choke input filter will output .6366 times that, or about 1910
volts.  Properly operating means that it has enough load current to have
good regulation, and I'm ignoring I*R voltage drops in the resistance of
choke and transformer windings here, and assuming "ideal" rectifiers.
Anyway, the peak forward voltage across the choke is 3000-1910 or 1090
volts.  But the peak negative is 1910 volts.  If you put the choke in
the output lead, then, for this example, it sees 3000 volts peak on one
side, and a constant 1910 volts on the other.  If you put it in the
return lead, it sees zero on one side and 1910 volts peak on the other.
It's not like you cut the insulation requirements to a couple hundred volts
or less.

Although the transformer secondary is floating, it turns out to not be too
much worse off than before, but it is a little worse, especially if it's a
center-tapped secondary.  In that case, at peak voltage across the
secondary, if the center tap is grounded, each side reaches a peak of 3000
volts, in this example.  But if the choke is in the return lead, at the
peak secondary voltage one side is at 1910 volts and the other is 6000
volts below that, or -4090.

Also, though I've assumed normal operation, if the load goes away, the
output voltage goes to the peak value, and you must be able to either
handle that or protect against it ever happening in some safe way.

In any event, I'd strongly agree with what others have posted:  use a choke
whose core and case you can ground!  And do the same with the transformer!
Don't take shortcuts around high power/high voltage.  It can kill you.

73, K7ITM



From [e-mail] Fri Sep 22 13:30:37 1995
Path: grape.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HV supply chokes
Date: Wed, 20 Sep 1995 13:56:52 -0700
Organization: CallAmerica, San Luis Obispo CA USA
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References: <[e-mail]> <[e-mail]>
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In-Reply-To: <[e-mail]>

Hi all.  You might want to be careful about putting the choke in the
negative lead of a full wave configured power supply.  If a short, even a
momentary one like a flashover were to occur, then almost the full supply
voltage would appear across the choke and, therefore the center tap of the
transformer.  Center taps are often placed near the core NOT anticipating
high voltage, and can be punchured in this fashion..73  de Cliff  W6HDO


From [e-mail] Fri Sep 22 13:30:39 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news1.digital.com!pa.dec.com!crl.dec.com!nntpd.lkg.dec.com!netcad.enet.dec.com!wade
From: [e-mail] (Paul Wade)
Newsgroups: rec.radio.amateur.homebrew
Subject: re: HV supply chokes
Date: 20 Sep 1995 21:14:03 GMT
Organization: Digital Equipment Corporation, LKG1-3/M07
Lines: 42
Distribution: world
Message-ID: <43q06r$[e-mail]>
Reply-To: [e-mail] (Paul Wade)
NNTP-Posting-Host: kali.enet.dec.com


>Article 10378 of rec.radio.amateur.homebrew:
>Path: nntpd.lkg.dec.com!crl.dec.com!crl.dec.com!caen!hookup!uwm.edu!spool.mu.edu!usenet.eel.ufl.edu!col.hp.com!simtel!news.sprintlink.net!bga.com!ftp.uni
>From: Jim Strohm <jstrohm@blazer>
>Newsgroups: rec.radio.amateur.homebrew
>Subject: Re: HV supply chokes
>Date: 19 Sep 1995 15:35:27 GMT
>Organization: UniSQL, Inc.
>Lines: 13
>Message-ID: <43mnvv$[e-mail]>
>References: <[e-mail]>
>NNTP-Posting-Host: blazer.unisql.com
>X-Newsreader: NCSA Mosaic
>
>Peter Dahl is a good source for HV transformers and chokes.
>
>Things to consider:
>additional filter caps may be cheaper than a filter choke, and will definitely
>    weigh less

>if you put the filter choke in the negative leg, you remove the requirement
>    for HV protection and reduce/eliminate the need for a dielectric standoff

DANGER!  putting the choke in the negative lead REDUCES the HV requirement
from roughly twice the operating voltage to roughly the operating voltage.
there is still a very serious dielectric requirement.

>you may be able to find a big filament transformer whose primary winding
>    provides sufficient inductance for your application.

high voltage is serious stuff -- do it right!

>
>Jim N6OTQ

sounds like it's time to finish the article on SPICE modelling of
high-voltage power supplies...

paul N1BWT





From [e-mail] Fri Sep 22 13:30:40 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: re: HV supply chokes
Date: 21 Sep 1995 15:04:44 GMT
Organization: UniSQL, Inc.
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References: <43q06r$[e-mail]>
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X-Newsreader: NCSA Mosaic

Paul Wade writes:
<snip>
> DANGER!  putting the choke in the negative lead REDUCES the HV requirement
> from roughly twice the operating voltage to roughly the operating voltage.
> there is still a very serious dielectric requirement.

True, unless some level of standard safety precautions are followed.

Maybe I should have qualified that the builder needs to include a low-impedance,
low-resistance path to ground, to allow for current metering as well as to
limit the potential on the (negative) return line.

The ARRL standard practice is to provide two paralleled power resistors of
approx 50 to 100 ohms from the return line to a proper chassis ground. This
will keep the return from swinging more than a few tens of volts off ground
and will sink enough current to blow fuses in a hurry if the voltage does
go too far from normal.  (Yeahyeah, I know the relative value of ARRL
technical information.)

I made the assumption that since the builder is asking for parts
here, he's doing this project on the cheap and knows what he's doing,
safety-wise and design-wise.

If he's doing this with no prior knowledge of the art, he doesn't need
filter chokes, he needs life insurance.

Isolated, full floating B+ and return were not in the design specs the builder
provided.

Jim N6OTQ

BTW, I just got flamed somewhere else for volunteering information.  I'll
grant that I don't know everything, but I feel that what I do know is
generally of value and is more information than the requestor had before,
and hence is useful.  I shouldn't have to cover my you-know-what
against everybody's trivial "yes, BUT" objection relating to some off-the-wall
case that occurs once in a blue moon.  I've offered simple information that
I felt was relevant to the scale of the problem described, and hoped that
others would add to this information, not trash me for opening my mouth.

There's absolutely no doubt in my mind that if I never posted again, a lot
of information that NEEDS to be shared would be lost, to the detriment
of a lot of hams. potential hams, and electronics hobbyists (yes, and
to newbies in a lot of other fields and hobbies).  Punish me for sharing?
Great idea.  I'll lurk or leave.  And so will a whole lot of others who
get slammed for offering info GRATIS, leaving the few of you who are
so convinced you know everything here to bicker over the tediously trivial.

Have a nice day.

Standard disclaimer


From [e-mail] Fri Sep 22 13:30:41 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HV supply chokes
Date: 21 Sep 1995 17:03:13 -0400
Organization: America Online, Inc. (1-800-827-6364)
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What a weird scramble? My text was little garbled. So let me finish.

The supply arced through the insulation and blew the wire in two, and the
wire pasted itself to my wrist. I received 1st, 2nd and 3rd degree burns
from that experience.
The resonant choke filter suggested in the book almost killed me! The
rubber mat and grounded panel certainly saved my life.

Since then I include spark gaps or other clamping across chokes. As near
as I could figure, when the choke hit resonance at turn on it must have
"rung" a bit. The peak voltage must have built up to many kilovolts of
surge causing the tubes to arc, and when they were removed the test lead
became the breakdown point.

Weird things can happen, so I am more cautious now.

73 Tom


From [e-mail] Fri Sep 22 13:30:42 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HV supply chokes
Date: 21 Sep 1995 22:24:51 -0400
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
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In article <43sfgi$[e-mail]>, [e-mail] (Bob
Hale) writes:

Hi Bob,

>
>But a capacitor input filter puts much more stress (in the form of RMS
>current) on the rectifiers, transformer, and power line.

Didn't you mean to say (in the form of peak current)??

73 Tom


From [e-mail] Fri Sep 22 13:30:44 1995
Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HV supply chokes
Date: Fri, 22 Sep 1995 10:25:26 GMT
Organization: IFWtech
Lines: 110
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References: <43ruuc$[e-mail]> <43sapa$[e-mail]>
Reply-To: [e-mail]
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Tom is SOOOO right!
:
: 1.) During a HV fault (and that is a common occurrence) the filter
: capacitance in the supply can release many hundreds of amperes of current,
: and the 50 ohm resistance will still allow the negative HV rail to rise
: nearly to full supply voltage.
:
: 2.) During the fault, the resistors will be subjected to huge overloads.
: If common wire wound, metal film, or carbon resistors are used (instead of
: the proper expensive and rare surge rated resistors) the components
: depended on for protection may fail.
:
: 3.) Even during normal supply operation, the negative rail can float to
: dangerious voltages. As little as one ampere can pull the negative rail to
: 50 or 100 volts if a negative rail connection fails or is not attached.
:
: I always use a diode network (with heavy diodes) to clamp the negative
: rail to the chassis, as well as a liberal sprinkling of 50 volt rated
: by-pass capacitors. The normal failure mode of these components is
: shorted, not open. So even in the event of a huge fault current between
: the rail and ground the supply rail remains clamped. Additionally I use a
: HV rated fuse and/or high surge current and voltage rated resistor in the
: positive lead near the capacitor to output connection (the bleeder remains
: directly across the capacitor).


What many designers don't appreciate is that in the event of a short
from B+ to chassis (like when you switch on without disabling the
top-cover safety switch) the short-circuit current will flow UP FROM
GROUND to the B- rail. As Tom says, in the absence of any built-in
precautions this can hoist the B- rail way above ground. It will
probably vaporize meter shunts, meters and various other forms of
delicate electronics connected in the region between B- and ground.

There's a dual approach to safety here.

First, Eimac and other tube manufacturers recommend a high-wattage
resistor in the B+ lead. This is not intended as a fuse, but as a
current limiter. About 25R per kV of B+ will limit the maximum
possible current to 40A. This will help greatly to protect the tube
in the event of an arc-over, and also protects the region around
the B- rail. The other advantage of this B+ resistor is that it
gives you a definite maximum current to design for (the actual
maximum current might be less, but it can't possibly be more).

In the B- rail, the main short-circuit protection should be a
DIODE (as Tom says). Yes there are resistors there too, but the
diode pointing UP FROM GROUND is the real line of defence to
prevent the B- rail from flying away above ground.

If the maximum possible current is 40A, why not use a protection
diode that is rated for 40A continuous? After all, they don't cost
much and a lot of collateral damage risk is riding on that
component. The cheapest source is a 40A potted bridge rectifier:
connect from corner to corner and you have two diodes in
parallel, back-to-back with two more. (The reverse diode,
pointing down from B- to ground is under much less stress.)

The meter shunt resistor (for grid current in the case of a GG
amplifier) is connected in parallel with this protection diode.
To prevent the diode from affecting the meter readings, the
voltage drop across the shunt must be much less than 0.5V.

Obviously you can connect other high-wattage "safety" resistors
between B- and ground if you want to, but the DIODE is the
real safety component.

To repeat: over-rate everything, because come hell or high
voltage the B+ resistor and the safety diode have got to hang
in there for as long as it takes the fuses to blow!

Here's a quick poll of the 1995 ARRL Handbook.

Power Supplies chapter: no mention of B- protection. The two
HV supply projects both feature 10R 25W resistors from B- to
ground and 50R 50W resistors in the B+. Not bad... but only
if there's some effective B- protection in the PA.

1500W HF amp and PSU: 15R 20W from B- to ground in PSU,
10R 20W in B+. The amp has another 10R 25W in series with B+
and unusually 25R 10W in series with the B-. That's a total
of 45R to limit the prospective B+ short-circuit current to
100A, give or take. But the short-circuit protection diode
(D104) in the PA is "1A, 100PIV, such as 1N4002". And if that
diode fails, everything goes through the grid-current meter.

8877 amp and PSU: 10R 25W from PSU B- to ground, 10R 25W in
PSU B+. Another 25R 25W in the PA B+ and - yes! - a 1N4007
to "protect" the B- rail and the meters from the effects of
a B+ short!

Get the picture? All the other designs are the same. They all
use a 1N400x because that's what the guy before used.
(OK, so a 1N400x has a much higher surge-current rating than
its continuous rating of 1A. But don't try to tell us that's
why they aren't using anything larger.)

On a related topic, why do US designs always seem to use the
single-pole Millen HV connectors, and not a coaxial HV type that
automatically provides a ground return as well? The idea of making
it physically possible to connect the B+ and forget the separate
ground/B- wire scares the hell out of me!

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



From [e-mail] Fri Sep 22 13:30:46 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HV supply chokes
Date: 22 Sep 1995 11:57:44 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 90
Sender: [e-mail]
Message-ID: <43umdp$[e-mail]>
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In article <[e-mail]>, Ian G3SEK
<[e-mail]> writes:

Hi Ian,

Interesting what you pointed out. I never looked at those articles before.
Now that I have, I see why you are concerned. Let me add a few comments of
my own.

>
>Here's a quick poll of the 1995 ARRL Handbook.
>
>Power Supplies chapter: no mention of B- protection. The two
>HV supply projects both feature 10R 25W resistors from B- to
>ground and 50R 50W resistors in the B+. Not bad... but only
>if there's some effective B- protection in the PA.
>

I take it you mean page 13.32.

My comments are:
R207 is too low in value. 10 ohms only limits the current to 300 amperes,
and not only that...the resistor is not speced to be the proper surge
rated HV type resistor. The resistor may explode or arc across the
internal winding and offer little or no resistance at all to a HV
overload.

No HV B- rail protection. R204 will NOT clamp the negative rail in the
event of an open B- return. If drive is applied to the tubes the B- rail
can only go to 12 volts or so, but if a fault condition occurs and none of
the non-high voltage rated resistors arc internally the - supply rail can
fly up to 1800 volts!

Then how about the 120V blowers returned to the *chassis* instead of the
power line neutral or just being placed across the filament transformer
primary?? What about one side of the filament transformer primary being
grounded to the chassis in the RF deck?? If we're worried about HV if a
ground lead breaks, we should also worry because the whole RF deck chassis
can reach 120 Vac from the unnecessary line voltage "neutral" ground
connections to the chassis.

Wow! A switch in the HV secondary winding!! Lord protect us!

And the builder is not duly cautioned to the hazzards if the shaft is not
securely grounded! The thing shouldn't be in the secondary at all. The
entire text is "S3 is a high-voltage switch with large contacts and
ceramic insulation used to select among the taps." Not enough caution or
care on this item alone.

Now here's where the low voltage design trouble begins..page 13.34 Control
circuitry

The exciter is subjected to the full discharge current of a 4.7 MFd cap
(C116) charged to 1.5 volts (no current limiting) every time the relay
closes. The circuit depends on the internal resistance of C116, the
wiring, and D116 to limit exciter contact closure current. The little reed
relay in the exciter probably says ouch, and for no reason at all! This
overcomplicated sequencing and control circuit now connects to both
antenna relays in parallel, so there IS NO SEQUENCING!! The only thing
sequenced is the LC voltage, and it is sequenced the wrong way!!!!!

The grid trip depends on the current gain of a 2N2222 (instead of a $.39
comparator) to fire a relay. Not too precise.

I see your point Ian. Lot's of parts that don't do anything. It does look
like they were put there just because someone saw them used elsewhere.

>1500W HF amp and PSU: 15R 20W from B- to ground in PSU,
>10R 20W in B+. The amp has another 10R 25W in series with B+
>and unusually 25R 10W in series with the B-. That's a total
>of 45R to limit the prospective B+ short-circuit current to
>100A, give or take. But the short-circuit protection diode
>(D104) in the PA is "1A, 100PIV, such as 1N4002". And if that
>diode fails, everything goes through the grid-current meter.
>

Good point again Ian. But please add this...

NO RF bypassing on the negative rail in the power supply. It would help
with safety if the bypass caps were 25 or 50 volt rated devices. The
bypass caps in the RF deck negative rail should be LV types (25-50 V) so
they fail shorted to protect the operator.

Unnecessary series resistance should NEVER be placed in *series* with the
negative (near ground potential) lead of a HV supply for obvious safety
reasons.

The non-surge rated limiting resistor are not speced to handle the
operating voltage.
And what good d


From [e-mail] Fri Sep 22 13:30:47 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: HV supply chokes
Date: 22 Sep 1995 13:26:16 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 43
Sender: [e-mail]
Message-ID: <43urjo$[e-mail]>
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The following didn't make it throught the text editor:

Unnecessary series resistance should NEVER be placed in *series* with the
negative (near ground potential) lead of a HV supply for obvious safety
reasons.

The non-surge rated limiting resistor are not speced to handle the
operating voltage.
And what good does a 1 A fuse do in the cathode??? Fuses are too slow and
unpredictable for serious protection, although they can prevent fires!

>8877 amp and PSU: 10R 25W from PSU B- to ground, 10R 25W in
>PSU B+. Another 25R 25W in the PA B+ and - yes! - a 1N4007
>to "protect" the B- rail and the meters from the effects of
>a B+ short!
>
>Get the picture? All the other designs are the same. They all
>use a 1N400x because that's what the guy before used.
>(OK, so a 1N400x has a much higher surge-current rating than
>its continuous rating of 1A. But don't try to tell us that's
>why they aren't using anything larger.)

Well the *normal* failure mode is shorted Ian, so I understand the 1N400x.
But the unreliability indicated by the word "normal" causes me to think
adding secondary failsafe components like LV rated bypass caps is
worthwhile. Nothing wrong with a bigger diode like you suggest, except
let's not put all our eggs in one basket here. Let's tack in a few 5 penny
parts for extra safety.

>
>On a related topic, why do US designs always seem to use the
>single-pole Millen HV connectors, and not a coaxial HV type that
>automatically provides a ground return as well? The idea of making
>it physically possible to connect the B+ and forget the separate
>ground/B- wire scares the hell out of me!
>

Because cost outweighs safety. On this side of the pond we prefer a little
excitement, such as pulling the unprotected ground lead while letting the
cat sleep on the chassis near our feet. :-) That's why we connect the
power line center-tap to chassis here also!

73 Tom


From [e-mail] Fri Sep 22 13:30:48 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!emory!darwin.sura.net!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: JW Miller Parts
Date: 21 Sep 1995 08:32:16 -0400
Organization: Harris Controls Division
Lines: 11
Message-ID: <43rm0g$[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]

Does anyone know a source for JW Miller parts. I am looking for slug
tuned inductors. i.e, 42A336CBI, 42A156CBI, etc etc. Maybe there is
a stock of these items somewhere???

Doug, N4IJ [e-mail]

--
Doug  Snowden
work: [phone]
[e-mail]



From [e-mail] Fri Sep 22 13:30:49 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news1.digital.com!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!est.enet.dec.com!randolph
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Land Mobile Radio FAQ needs your input!
Date: 22 SEP 95 11:09:12
Organization: Digital Equipment Corporation
Lines: 70
Message-ID: <43ujg9$[e-mail]>
NNTP-Posting-Host: improv.enet.dec.com
Xref: grape.epix.net rec.radio.amateur.misc:86823 rec.radio.amateur.homebrew:9583 rec.radio.amateur.equipment:17205


[This post lists all the information I'm looking for. You'll only have to look
 at this once in a while from now until the FAQ is ready - N1OOQ]

The Land Mobile Radio FAQ is now under way... I need your support!

What is it?

     A listing of those surplus police and taxicab radios from the various
manufacturers, how to identify them, what band they're on, how easy it is to
tweak them into the ham bands, average price used, etc., all in one file for
your flea market shopping convenience!

     What it's not is a mod manual. You won't find out HOW to do the mods in
the FAQ. That's up to you. You will find out where to get the manufacturer's
manuals, most of which have detailed tuning procedures. Some of the radios
can only be programmed by the manufacturer, and/or by using the
manufacturer's proprietary software. Such details will be in the FAQ.

     I'd like to include any and all mobile or handheld radios aimed at the
commercial or public service market. Many of these out-perform the imported
synthesized units by a long shot, are cheaper, and make great ham rigs! Let's
put these great radios back to work and on the air!

I NEED YOUR INPUT TO MAKE THIS A REALITY!

     You don't need to mail me manuals or anything like that, unless you WANT
to. All I ask is a few bits of data for any of these radios you or your
friends may have worked on in the past. If you've put one on the air, you've
had to answer these questions, so fill 'em out and send 'em in!

Model?                  Manufacturer, model name (like Mastr II, Syntor,
                        Delta, etc.), model number

Band?                   These radios are usually made for use in a specific
                        band of frequencies, like 30-50 MHz, 150-170 MHz,
                        450-470 MHz, etc.

Freq control?           Crystal, synthesized/ROM programmed,
                        synthesized/microprocessor programmed

Average price?          What did you pay? What prices did you see when
                        shopping? New or used?

Manual price?           How much did the manual cost?

Mod difficulty?         How hard was it to get it tuned to ham band?
                        Easy: re-crystal, tweak a few tuning screws
                        Difficult: program a new ROM, swap a few parts
                        Extremely difficult: Major modification and re-design
                                             of some circuits, you must pay
                                             authorized technician to use
                                             manufacturer's software

How to indentify?       What details do you need to know to tell these radios
                        apart? Does the serial number tell you anything? Does
                        the Model number? Are there physical differences?
                        This is the stuff you need to know when sorting
                        through the radios at the flea markets.  This
                        information is usually in the manufacturer's manuals
                        in great detail.

I will re-post this notice about every couple of weeks for a while, until the
FAQ is somewhat filled out.

My net address is:   [e-mail]
All information, network pointers, periodical references, anything, is
appreciated, and thanks in advance!

-Tom R.   N1OOQ   [e-mail]


From [e-mail] Fri Sep 22 13:30:51 1995
Path: grape.epix.net!news.sprintlink.net!psgrain!rainrgnews0!usenet
From: [e-mail] (Joe Sullivan)
Newsgroups: rec.radio.amateur.homebrew
Subject: looking foe ICOM 2GXAT mod to give me 155 mhz
Date: 20 Sep 1995 04:23:21 GMT
Organization: RGNet
Lines: 4
Message-ID: <43o4vq$[e-mail]>
NNTP-Posting-Host: p16.t0.halsey.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

I need to modify an Icom 2gxat to transmit on 155 Mhz for use with a
commercial buisness liscense on that frequency.
Post replys here or email to [e-mail]



From [e-mail] Fri Sep 22 13:30:52 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: [e-mail] (Gary P. Fiber)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking foe ICOM 2GXAT mod to give me 155 mhz
Date: 20 Sep 1995 12:27:25 GMT
Organization: Northwest Nexus Inc.
Lines: 14
Message-ID: <43p1bd$[e-mail]>
References: <43o4vq$[e-mail]>
NNTP-Posting-Host: blv-pm10-ip28.halcyon.com
X-Newsreader: WinVN 0.92.1

In article <43o4vq$[e-mail]>, [e-mail] (Joe Sullivan) says:
>
>I need to modify an Icom 2gxat to transmit on 155 Mhz for use with a
>commercial buisness liscense on that frequency.
>Post replys here or email to [e-mail]
>
send your MARS or CAP license to ICOM America, Inc
                                                     2380 116th Ave N.E.
                                                     Bellevue, WA 98004

They will send you the modification if you ask for it.  But will only furnish it when one of the above
licenses  is supplied. Also there is the book named radio / Tech Modifications that has the information in it also.

73' Gary .


From [e-mail] Fri Sep 22 13:30:53 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: looking foe ICOM 2GXAT mod to give me 155 mhz
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <43o4vq$[e-mail]>
Date: Fri, 22 Sep 1995 00:20:29 GMT
Lines: 14

In article <43o4vq$[e-mail]> [e-mail] (Joe Sullivan) writes:
>I need to modify an Icom 2gxat to transmit on 155 Mhz for use with a
>commercial buisness liscense on that frequency.

Sorry, the 2GXAT isn't Type Accepted for business band use. Icom
makes a *very* similar radio that is, however.

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 Sep 22 13:30:54 1995
Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!btnet!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Sandy Blaize, W5TVW <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.homebrew,rec.radio.swap
Subject: More Stuff for Sale/Swap
Date: 21 Sep 1995 00:14:54 GMT
Organization: Alligator Amateur Radio of the South
Lines: 34
Message-ID: <43qapu$cq6$[e-mail]>
Xref: grape.epix.net rec.radio.amateur.homebrew:9543 rec.radio.swap:43443

EICO Test Equipment for sale or trade:

Nine EICO 324 Signal Generators (Factory wired models) cover
150 Khz. to 145 Mhz in six bands. Condition is good, excellent or mint. With
manuals. Will sell from $15 to $25 plus shipping and packing.

EICO 666 Factory wired tube tester.  Also has transistor test function. Dynamic
Conductance type tester.   Condition: internally good to excellent,
case is worn with a dent. Sell with manual for $25 plus shipping/packing.

Two EICOModel 667 Factory wired tube testers.  Condition good internally,
cases show wear.  These basically same as 666 above, but have Novar and
Compactron sockets added.  Sell with manual for $35 each plus shipping
and packing.

2 each Amperex 4CX250B Tubes New old stock..$40 each shipped.

3 each 4CX250B tubes, one new but tarnished, 2 are pullouts.  The lot
for $35 shipped.

2 each Amperex (British made) 813 tubes, New old stock.  These have graphite
anodes! $25 each shipped.

Sencore "Mighty Mite" tube checker, small compact.  Fair condition.
$15 plus shipping/packing.

I am open to trades.  Looking for a Hallicrafters SR-75 transceiver in good
condition or better, Hallicrafters SX-100 (late mark) in excellent condition
or better, Hallicrafters S38 (5 knob model) in good condition or better,
McMurdo-Silver "Super Gainer" receiver with coils, McMurdo Model 802
receiver with coil sets.....what have you?

Sandy Blaize W5TVW Internet:70401,[e-mail]



From [e-mail] Fri Sep 22 13:30:55 1995
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.homebrew,rec.radio.swap
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!news1.boi.hp.com!dougj
From: [e-mail] (Doug Jackson)
Subject: Re: More Stuff for Sale/Swap
Sender: [e-mail] (Boise Site News Server)
Message-ID: <[e-mail]>
Date: Thu, 21 Sep 1995 17:31:45 GMT
References: <43qapu$cq6$[e-mail]>
Nntp-Posting-Host: hpdmmef.boi.hp.com
Organization: Hewlett Packard, Boise ID
X-Newsreader: TIN [version 1.2 PL1.4]
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Lines: 18
Xref: grape.epix.net rec.radio.amateur.homebrew:9559 rec.radio.swap:43500

SandyBlaize wrote:
: EICO Test Equipment for sale or trade:

: Nine EICO 324 Signal Generators (Factory wired models) cover
: 150 Khz. to 145 Mhz in six bands. Condition is good, excellent or mint. With
: manuals. Will sell from $15 to $25 plus shipping and packing.

: EICO 666 Factory wired tube tester.  Also has transistor test function. Dynamic
--
Doug Jackson (Hewlett-Packard DMD Development)

Sandy, I am interested in one of the Eico 324's in the $15-$20 range.
My email reply to you bounced. Can you try to email me direct if you still
have one???

thanks,
Doug Jackson



From [e-mail] Fri Sep 22 13:30:57 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.voicenet.com!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Patch Antennas -- References??
Date: Thu, 21 Sep 1995 17:49:18 GMT
Organization: RST Engineering
Lines: 28
Message-ID: <43s8o4$[e-mail]>
NNTP-Posting-Host: @rst-engr.oro.net
X-Newsreader: Forte Free Agent v0.55
Xref: grape.epix.net rec.radio.amateur.homebrew:9567 rec.radio.amateur.misc:86777

In the October '95 issue of QST, Hal Ward (W1GE) wrote an article on a
GPS patch antenna.  One of the references he used to design the
antenna was a book by David Pozar titled "Antenna Design Using
Personal Computers".  Hal also noted that the book was published by
Artech House in '85 and is out of print.

It is also out of library.  My library did a data search and came up
empty.  Does anybody know either (a) where I can get my hands on a
copy of this book even if only for a day or (b) another good reference
text for patch antennas.  Neither Jasik nor Hamsher (my two antenna
bibles) make any reference to a "patch" antenna.

You can post here or email me, whichever suits your fancy.  BTW, I
will obviously be willing to pay copy and/or postage costs for any of
this information.

Thanks for your help, gang.

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From [e-mail] Fri Sep 22 13:30:58 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.voicenet.com!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Re: Patch Antennas -- References??
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Thu, 21 Sep 1995 21:48:46 GMT
References: <43s8o4$[e-mail]>
Nntp-Posting-Host: hplsnb.lsid.hp.com
Organization: Hewlett-Packard
X-Newsreader: TIN [version 1.1 PL9.4]
Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Lines: 34
Xref: grape.epix.net rec.radio.amateur.homebrew:9582 rec.radio.amateur.misc:86812

Jim Weir ([e-mail]) wrote:
: In the October '95 issue of QST, Hal Ward (W1GE) wrote an article on a
: GPS patch antenna.  One of the references he used to design the
: antenna was a book by David Pozar titled "Antenna Design Using
: Personal Computers".  Hal also noted that the book was published by
: Artech House in '85 and is out of print.

: It is also out of library.  My library did a data search and came up
: empty.  Does anybody know either (a) where I can get my hands on a
: copy of this book even if only for a day or (b) another good reference
: text for patch antennas.  Neither Jasik nor Hamsher (my two antenna
: bibles) make any reference to a "patch" antenna.

"Reference Data for Engineers," published by Howard Sams, has a chapter
on antennas which by its own admission is a broad-brush overview.  The
seventh edition, at least, has a page or so on "Printed-Circuit
Antennas," including the patch antenna.  There are several references.
The fundamental one seems to be Deschamps and Sichak, "Microstrip
Microwave Antenna,"  Proc. 1953 Allerton Antenna Symposium, University
of Illinois.  Skipping several references, we come to the following text
and footnote-reference:

    "... Although a square patch could be fed on two adjacent sides with
    the proper phases to obtain circularly polarized radiation, simpler
    circularly polarized patches have been developed."

    (Reference to above:  Kerr, J. L.  "Microstrip Antenna Developments."
    Proc. Printed Circuit Antenna Technology Workshop, October, 1979, New
    Mexico State University.

Many of the references are to papers from conferences, alas.

73, K7ITM



From [e-mail] Fri Sep 22 13:30:59 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!spool.mu.edu!news.cs.indiana.edu!rsg1.er.usgs.gov!stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: question: NE-602A
Date: Wed, 20 Sep 1995 11:39:12 GMT
Organization: Oak Ridge National Lab, Oak Ridge, TN
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: zaek25.ymd.ornl.gov
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

Does anyone have the figures for the noise current and the noise voltage for
the  RF inputs for the NE-602A mixer.

Or the noise resistance figure for it.

Danny
[e-mail]



From [e-mail] Fri Sep 22 13:31:01 1995
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.voicenet.com!news.sprintlink.net!newsfeed.internetmci.com!newsxfer.itd.umich.edu!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Radio for 9600 baud@UHF
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4332ef$[e-mail]>
Date: Fri, 15 Sep 1995 16:45:41 GMT
Lines: 61
Xref: grape.epix.net rec.radio.amateur.digital.misc:10505 rec.radio.amateur.homebrew:9532

In article <4332ef$[e-mail]> [e-mail] writes:
>       I was wondering if there are any suggestions out there for which
>radios are easiest to convert to UHF 9600 baud packet radios.  There are
>several people in the area that would like to get on the air and it has
>been a while since anyone purchased any commercial radios that got
>converted to this mode.  Of course we are looking at inexpensive and
>reliable radios.

You want the Tekk KS-900. It's designed for 9600 baud data, and it's cheap.
Or you can use the Kantronics D4-10. It's also designed for 9600 baud data,
but not quite so cheap. Or you can butcher an old Micor or Mitrek, though
opening up the IF bandwidth is not trivial if you want good performance.

QST says that of the Japanese radios you want an all-mode since
they usually avoid the synthesizer loop bandpass problem by
modulating an IF stage. They also raved about a new, and expensive,
Azden that's designed for 9600 baud data and FM voice.

Most of the Japanese radios advertised as "9600 baud ready", aren't.
That's just advertising copy, not engineering. It usually means they
put a jack on the back labeled "data", but didn't do any of the
bandpass modifications necessary to properly handle 9600 baud, IE
phase linearity sucks. A case in point is the Kenwood 733. While many
have tried to use them at 9600 baud, the BER is disappointing. And QST
gagged over a couple of Icom models too.

You want a direct FM radio, preferably crystal controlled or IF
modulated, with a receiver IF filter that's gentle and fairly
broad in order to have a reasonable phase response. IF filters
generally suffer severe phase linearity problems near their edges,
so you need a filter that's broader than the modulation would indicate
in order to stay near the filter center and avoid the phase errors
out at the edges. A 30 kHz bandpass seems to work well for 9600 baud.

Unfortunately, SNR and adjacent channel rejection suffer with the broad
gently sloped filters, so you'll need more than expected signal strength,
and a greater guard band, in order to get through with a low BER. This
is a result of the decisions made for the modulating signal in order
to use it through voice grade FM radios. There are much better modulation
forms that could be used with purpose built radios. An example is the
MSK used with the 56kb RF modem. More nearly ideal filters can be used
with this modulation than with the K9NG/G3RUH modulation, but voice
grade FM radios can't be used with MSK so you need purpose built
data radios.

Interestingly, QST found that *overdeviating* the voice grade radios
often resulted in lower BER at 9600 baud. This is contrary to the
experience with 1200 baud where low deviations generally work best,
IE 3 kHz instead of 5 kHz works better for 1200 baud. It may be that
a form of limiting occurs in the non-linear IF filters of voice
grade radios with hot 9600 baud modulation which sidesteps some of
the phase linearity problem. If you try this, watch total occupied
spectrum, however, to make sure you stay within the limits for the
band you are using, IE don't try this at 2 meters.

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 Sep 22 13:31:02 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!uunet!in1.uu.net!explorer.csc.com!wb3ffv!bbs!Mike.Czuhajewski
From: [e-mail] (Mike Czuhajewski)
Subject: Re: Ramsey Kits
Sender: [e-mail] (Mike Czuhajewski)
Message-ID: <[e-mail]>
Date: Fri, 15 Sep 1995 02:21:46 GMT
Reply-To: [e-mail] (Mike Czuhajewski)
References: <42f5d5$[e-mail]> <42fbs1$[e-mail]> <[e-mail]> <42n7nj$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
X-Posting-Software: UniBoard 2.00beta3 S/N 329931
Organization: ABSnet Internet Services, Inc.
Lines: 16

Ramsey and spurs and harmonics?   A friend once built one of their 40
meter QRP transmitters.  I tested it on a $5,000 communications monitor
and it showed that the second harmonic was 20 dB down from the
fundamental, clearly contrary to FCC rules.  I later verified that
figure with a $10K comm monitor, and later with a $25K Hewlett-Packard
spectrum analyzer.  The pi net filter was a simple 3 element design,
with odd component values to boot.  (All component values were correct,
ie, they had the proper parts in the kit--I verified actual values.)
Instead of letting him put the rig on the air as-is, I tacked on an
additional filter in series with the existing one, and the output is
now much cleaner, with the second harmonic about 51 dB below the
fundamental at a very small cost in added insertion loss.  Moral--if
you build a Ramsey QRP transmitter, you might want to have someone
check the spectrum if they have the equipment.  I don't know if this
problem appears in other bands, but it certainly exists in the 40M
version unless they made design changes in the last 2 years.


From [e-mail] Fri Sep 22 13:31:04 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!gateway.sequent.com!muncher.sequent.com!sledge
From: [e-mail] (Dwight Sledge)
Subject: Re: Ramsey Kits
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet )
Nntp-Posting-Host: sequent.sequent.com
Organization: Sequent Computer Systems Inc.
References: <42f5d5$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Date: Fri, 22 Sep 95 01:42:03 GMT
Lines: 94

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>In article <[e-mail]> [e-mail] writes:
>>In article <[e-mail]>, <[e-mail]>
>>writes:
>>> Folks, if you're going to build transmitters, look at the kit
>>> suppliers as convienent one stop purchasing agents, but know
>>> enough about design and testing to correct their errors and
>>> tune up their designs properly, just as if you were working
>>> from scratch. If all you know is how to follow directions in
>>> a manual, you'll likely end up in deep doo.
>>
>>But the Ramsey kit _seems_ to offer a functional 2M transceiver for MUCH less
>>money than even a cheap HT, this makes it very attractive to folks without a
>>lot of money to spend! I might build one but I have ready access to the test
>>equipment to make sure it's legal though I would probably do so even if I did.
>>I'm currently studying for the license exams and when I look at the prices for
>>some of the 2M equipment I have to admit I'm a little put off. Is there a
>>low-buck alternative (after all 50% off an expensive radio still may not be a
>>bargain for some) ?
>
>Yes, there is an alternative, commercial 2-way surplus. You can easily
>and inexpensively convert surplus commerical 2-way gear to the 2m or
>70cm bands from their adjacent commercial allocations. And this stuff
>is cheap, typically in the $50 and under price range. Its also likely
>to be of higher quality and higher performance than even the big buck
>new amateur gear. Of course there won't be any Gameboy features, and
>it won't be a sorry excuse for a scanner, but it will be a great
>communications radio.
>
>As example, I bought a high band GE MVP that someone had installed in
>a portable carrying case for $10 at Dayton. It was crystalled on a
>Forest Service frequency. When I got this diamond in the rough home
>and opened the homemade case, I found a brand new looking 90 watt
>amplifier tucked inside, and the MVP worked too! $20 for a set of
>channel element crystals in the 2 meter band, a bit of tweaking,
>and I have a 90 watt portable or mobile rig that will outperform
>any Japanese radio or Ramsey kit as far as purity of emissions
>and freedom from intermod are concerned, all for a total outlay
>of $30.
>
>Now you won't stumble on something like this every day, but I
>did pick up 3 UHF Mastr Execs (80 watt mobiles) the same day
>for $50 each to serve as repeater spare parts, and they all
>worked too! There are stacks and stacks of Motorola and GE
>commercial rigs for sale at most hamfests. HTs too! If you
>take the time to learn the combo numbers of the various models,
>you can find some wonderful communications radios, cheap.
>
>IMHO, Motorolas are overpriced on the amateur market, especially HTs,
>so I mostly search out GE radios. They're perhaps even more bulletproof
>than the Motos, but are usually cheaper. I bought 8 GE PE HTs with a
>gang charger all for $100 once. They were ex-police UHF units. Those
>things can be used as clubs for subduing the bad guys, and then used
>to call it in. They won't fall to pieces under rough treatment like
>the Japanese HTs, and they also won't howl with intermod in high RF
>areas.
>
>Of course, all but the newest, and most expensive, commercial
>surplus will be crystal controlled, but most hams hang out on
>only one or two repeater frequencies most of the time anyway,
>so that's not really a problem.  The commercial rigs are typically
>2, 6, or 8 channel units. If you fill all the channel element
>slots in an 8 channel unit, you could spend $160, but you typically
>don't need that many frequencies. If you do, you might opt for
>the more expensive synthesized surplus equipment. That might
>run you $200 or so (and you might pull your hair figuring out
>how to program the synthesizer). I haven't felt the need, and
>avoid the aggravation of fooling with synthesizers.
>
>These rigs also make wonderful packet radios.  Tuck them in
>a crawl space somewhere and forget them. They'll just work and
>work for years and years without attention.
>
>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     |                     |


Gary,

I don't see the Japaneses radios as items that will, to quote you

"fall to pieces under rough treatment"

My ICOM u2AT was launched from my car on a highway at 50 mph. The worst
problem was the volume knob came off and I could not find it. The radio
still works fine to this day.

sledge



From [e-mail] Fri Sep 22 13:31:05 1995
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!EU.net!dkuug!Norway.EU.net!nntp-trd.UNINETT.no!nntp-trd.UNINETT.no!pc158-89
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematics for Receiver
Date: 21 Sep 1995 11:35:29 GMT
Organization: Oslo College
Lines: 23
Message-ID: <43rim1$[e-mail]>
NNTP-Posting-Host: pc158-89.iu.hioslo.no
X-Newsreader: News Xpress Version 1.0 Beta #4


I am interested in any
schematics of recievers
at the:
        160m - 10m .

I am only interested in receivers,
not transmittors. (I have a technical license
only permitted to recieve).

If anyone have, or know where to find, such
schematics please mail me, or leave
a message at this newsgroup.

My e-mail is:
        [e-mail]

Thanks.
Geir.

-------------------------------------------------------------------------
 AARVIK GEIR/3EY, email : [e-mail]
-------------------------------------------------------------------------


From [e-mail] Fri Sep 22 13:31:06 1995
Path: grape.epix.net!gopher.cs.uofs.edu!netnews.upenn.edu!news.voicenet.com!news.sprintlink.net!ralph.vnet.net!lys.vnet.net!not-for-mail
From: [e-mail] (MARK REEVES)
Newsgroups: comp.robotics.misc,sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Seeking Info on Short-Range (8-9 ft) RF Data Links
Date: 14 Sep 1995 21:04:12 -0500
Organization: Vnet Internet Access, Inc. - Charlotte, NC. [phone]
Lines: 13
Message-ID: <43amus$[e-mail]>
References: <42slgb$[e-mail]> <42tfnn$[e-mail]> <4312iu$[e-mail]> <4365pp$[e-mail]>
NNTP-Posting-Host: lys.vnet.net
Xref: grape.epix.net sci.electronics:144112 rec.radio.amateur.homebrew:9546

You could use an IR arrangement, just use a white ceiling to bounce the
light off. It works with my remote.  You might have to increase the IR
leds a bit, but it should work.

Digikey sells some 300 MHZ transmitters/receivers.  They seem intended
for remote unlocking of things, but you can use them as a regular serial
stuff.

I have a set that I am trying to use to sned data on my hot tub to my PC,
I haven't gotten far with it though...

MArk



From [e-mail] Fri Sep 22 13:31:07 1995
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From: [e-mail] (DedElvis01)
Newsgroups: rec.radio.amateur.homebrew
Subject: Small 10 meter beam antenna construction HELP
Date: 20 Sep 1995 19:03:02 -0400
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I am looking to build a small 10 meter beam antenna and would appreciate
any help from anyone who may have ideas or plans for such an antenna. I am
also interested in the X beam 2 element antenna.


From [e-mail] Fri Sep 22 13:31:08 1995
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From: "[e-mail]" <Joe Rocci>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spice Simulator
Date: 19 Sep 1995 22:36:38 GMT
Organization: Net Access - Philadelphia's Internet Connection
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Jay Wicklund <[e-mail]> wrote:
>
>I've seen several requests on this group for information about free
>or inexpensive Spice simulator programs.  I just came across a
>notice of an evaluation copy of spice, including schematic entry,
>and graphics post processor from Intusoft.  These are evaluation
>copies for PC/Windows based computers.
>
>Can be downloaded via ftp from "ftp.iee.ufrgs.br", which I believe
>is a site in Brazil.
>
>There is also mention of a compuserve forum that may also include
>the software:  Go CADDVEN  .. Library 21
>
>I haven't checked either site to confirm, but good luck....
>
>73 de KI7RH (Jay)
>
>

There's also an evaluation version of MicroSim's Spice suite available
from :
             ftp://ftp.ksu.ksu.edu/ieee/pspice/

This package includes schematic editor, spice analyzer, and plotting
programs.

Joe
WA3CMQ












From [e-mail] Fri Sep 22 13:31:09 1995
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From: [e-mail] (Clark W. Hanley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spice Simulator
Date: Wed, 20 Sep 1995 15:01:18 GMT
Organization: The Aerospace Corporation, El Segundo, CA
Lines: 45
Distribution: world
Message-ID: <43pac1$[e-mail]>
References: <[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

Hi All

   The (as far as I know) newest version of PSpice is avalible from
SimTel and its mirrors.  The first place to try is:

http://www.acs.oakland.edu/oak/SimTel/msdos/electric.html

or

ftp://oak.oakland.edu/oak/SimTel/msdos/electric

or any of your faverit SimTel mirrors.

The Files you want are:

pspic54a.zip
pspic54b.zip
pspic54c.zip


Good luck.           Clark


Jay Wicklund <[e-mail]> wrote:


>I've seen several requests on this group for information about free
>or inexpensive Spice simulator programs.  I just came across a
>notice of an evaluation copy of spice, including schematic entry,
>and graphics post processor from Intusoft.  These are evaluation
>copies for PC/Windows based computers.

>Can be downloaded via ftp from "ftp.iee.ufrgs.br", which I believe
>is a site in Brazil.

>There is also mention of a compuserve forum that may also include
>the software:  Go CADDVEN  .. Library 21

>I haven't checked either site to confirm, but good luck....

>73 de KI7RH (Jay)






From [e-mail] Fri Sep 22 13:31:10 1995
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From: "James P. Meyer" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spice Simulator
Date: Thu, 21 Sep 1995 14:11:47 -0400
Organization: Duke University, Durham, NC, USA
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On Wed, 20 Sep 1995, Ian G3SEK wrote:

> Thanks to the several people who said where the program can be found.
>
> Now where's the manual, please?

        Gee, you give some folks an arm and then they come back later
looking for a leg...  8-)

        You'll have to pay for a manual.  The free software is just to
give you a little look at some of the capabilities of the program.  There
are several books out that will serve as a manual.  I had a list of
several of them, but of course, I can't seem to find them now.  8-(

Jim "no sig" Meyer



From [e-mail] Fri Sep 22 13:31:11 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Tom Bruhns)
Subject: Re: Spice Simulator
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Thu, 21 Sep 1995 20:13:31 GMT
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Ian G3SEK ([e-mail]) wrote:
: Thanks to the several people who said where the program can be found.

: Now where's the manual, please?

Gee, depends on which manual.  As others have said, you can get one of the
many books that folk have written about Spice.  I recently got
Rashid, "Spice for Circuits and Electronics Using PSpice," second edition,
Prentice Hall.  Seems OK.  Before that, I used just the Berkeley manual
which you used to be able to get via ftp from the UC Berkeley site; I don't
recall its exact name right now.  It's available at least in postscript
format, which produces a fairly nice printout on a postscript laser
printer.  It's for Berkeley Spice 3.  It won't tell you very much about the
hows and whys and troubleshooting, but it tells you what models are built
in and what the format is for them.




From [e-mail] Fri Sep 22 13:31:12 1995
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From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spice Simulator
Date: Wed, 20 Sep 1995 22:54:39 GMT
Organization: IFWtech
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References: <[e-mail]>
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Thanks to the several people who said where the program can be found.

Now where's the manual, please?


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



From [e-mail] Fri Sep 22 13:31:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Spice Simulator
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]>
Date: Fri, 22 Sep 1995 00:16:32 GMT
Lines: 18

In article <[e-mail]> [e-mail] writes:
>
>Thanks to the several people who said where the program can be found.
>
>Now where's the manual, please?

Manual? We're amateurs, we don't need no stinkin' manuals. :-)

This is where they get you. There's a good book, _Computer-Aided
Circuit Analysis Using PSpice_ by Walter Banzhaf ISBN 0-13-159534-2
from Prentice Hall for a mere $37.50.

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 Sep 22 13:31:14 1995
Path: grape.epix.net!news.sprintlink.net!news.onr.com!usenet
From: [e-mail] (Charlie Thompson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spice Simulator--Free
Date: 21 Sep 1995 18:44:55 GMT
Organization: .....Very little organization
Lines: 33
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References: <[e-mail]> <[e-mail]>
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There should be a student version of PSpice floating around
the net somewhere.  It does a max of 10 transistors....but's
it's a NICE freeware package.

-c.t.


>In article [e-mail], Ian G3SEK <[e-mail]> writes:
>> Thanks to the several people who said where the program can be found.
>>
>> Now where's the manual, please?
>>
>>
>> --
>> 73 from Ian G3SEK            Editor, 'The VHF/UHF DX Book'
>>                             'In Practice' columnist for RadCom (RSGB)
>> Professionally:
>> IFW Technical Services       Clear technical English - anywhere.
>>
>
>
>I dont know of a free source, but one book I have is:
>
>SPICE  - A guide to Circuit Simulation & Analysis Using PSpice, by P. W. Tuinenga,
>Prentice Hall, 1988. Cost #25 at some time between 1988 and now.
>
>Cant say how good/bad it is, since I've only glanced at the first few pages, but
>other in the department think its okay.
>
>dave kirkby G8WRB.
>
>


From [e-mail] Fri Sep 22 13:31:15 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Was Re: Ramsey Kits, now modified commercial gear
In-Reply-To: [e-mail]'s message of Thu, 14 Sep 1995 16:45:03 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <42f5d5$[e-mail]> <42fbs1$[e-mail]>
        <[e-mail]> <42n7nj$[e-mail]>
        <[e-mail]>
        <[e-mail]>
        <[e-mail]>
Date: Fri, 15 Sep 1995 03:42:53 GMT
Lines: 14

While I think modified commercial gear is probably a good thing, it's
somewhat less accessible to most of us, because we have no history
with it.  For instance, I have no idea which GE radios are easy to
convert, and which aren't.  Same goes for Motorola.  I mean, Micor,
Motran, Mitrek, etc. mean nothing in themselves, and even less when
I'm looking at a radio at a swap meet.  In some cases, I can't even
tell if I've got all the pieces.

There's been lots of good information put forth here, and on the
land-mobile mailing list, but you people who know the details need to
put together a FAQ about all of this.  The information is out there,
and it dribbles in from time to time, but it needs to be put together.
Thanks and 73,
doug


From [e-mail] Fri Sep 22 13:31:16 1995
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From: [e-mail] (Mark Monninger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Was Re: Ramsey Kits, now modified commercial gear
Date: Wed, 20 Sep 1995 19:22:09 MST
Organization: Primenet
Lines: 15
Message-ID: <[e-mail]>
References: <42f5d5$[e-mail]> <42fbs1$[e-mail]> <[e-mail]> <43mo3s$[e-mail]>
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While I don't disagree with the advice about old commercial gear, you gotta do
a little research before you get into it. Crystals run $12-15 each and you'll
probably need 2 for each freq you want to use. Add a couple pairs of rocks to
the $50 or so you pay for the radio, plus the time and additional parts you
may need and you're in the ballpark of a used ham transceiver. I've found
older 2M and 70cm  Icoms and Kenwoods for $125-150 at swap meets...an
alternative to old commercial rigs and a helluva lot better alternative than
the Ramsey radios for less money.

On the other hand, A buddy of mine and I rescued a bunch of old Motorola
radios (Mocom 70's) from the dumpster (literally) and tweaked them onto the
freq of the local 70cm rptr for $25 each (a pair of crystals) and a couple
hours work. They'll probably outlast the cars/trucks they're installed in.

73...     Mark   AA7TA


From [e-mail] Fri Sep 22 13:31:17 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!news.rmii.com!nexus.interealm.com!root
From: [e-mail] (wayne wicks)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: EIMAC 8874
Date: Thu, 21 Sep 1995 22:50:04 GMT
Organization: ICG/MagNET [phone]
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Need one more 8874 for spare.
Please contact Wayne WA2KEC
[e-mail]
73's and tnx



From [e-mail] Fri Sep 22 13:31:18 1995
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From: [e-mail] (wayne wicks)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: EIMAC 8874
Date: Fri, 22 Sep 1995 02:16:58 GMT
Organization: ICG/MagNET [phone]
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Need one more 8874 for amp spare,

wayne  /  wa2kec



From [e-mail] Fri Sep 22 13:31:19 1995
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From: [e-mail] (DedElvis01)
Newsgroups: rec.radio.amateur.homebrew
Subject: X beam antenna suggestions
Date: 20 Sep 1995 19:02:50 -0400
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
Message-ID: <43q6iq$[e-mail]>
Reply-To: [e-mail] (DedElvis01)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am interested in building an X beam for a small space antenna. I would
appreciate if anyone have had any luck, good or bad with this antenna to
please pass it along.Any other suggestions for a small portable gain
antenna >???


From [e-mail] Mon Sep 25 19:34:05 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] (KGreasbyjr)
Newsgroups: rec.radio.amateur.homebrew
Subject: *********NEED SHORTWAVE FREQ. FOR BO GRIS
Date: 24 Sep 1995 21:51:01 -0400
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
Message-ID: <4451u5$[e-mail]>
Reply-To: [e-mail] (KGreasbyjr)
NNTP-Posting-Host: newsbf02.mail.aol.com

PLEASE HELP ME!!!  I am looking for the freq. and time for the Bo Gris
shortwave radio show.  Please E-mail them to me.


From [e-mail] Mon Sep 25 19:34:06 1995
Path: grape.epix.net!news.sprintlink.net!sundial.sundial.net!usenet
From: [e-mail] (John Hoaglun)
Newsgroups: rec.radio.amateur.homebrew
Subject: 190.400 reciever
Date: Sun, 24 Sep 1995 03:12:05 GMT
Organization: Sundial Internet Services
Lines: 15
Message-ID: <442i3l$[e-mail]>
NNTP-Posting-Host: sundial.sundial.net
X-Newsreader: Forte Free Agent 1.0.82

How hard would it be to build a 190.400 reciever ???? Where could I
get  the needed info to build this reciever ?



John Hoaglun
[e-mail]

  John Hoaglun
  [e-mail]

  To surf one of the  web pages  that I maintain point to:

  http://www.sundial.net/~wftvch9/



From [e-mail] Mon Sep 25 19:34:06 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!interaccess!d181.nb.interaccess.com!user
From: [e-mail] (Dave Moorman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AMATEUR RADIO GONE COMMERCIAL!!!
Date: Sun, 24 Sep 1995 18:46:36 -0500
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 15
Message-ID: <[e-mail]>
References: <43kbvd$[e-mail]> <43t7sh$[e-mail]>
NNTP-Posting-Host: d168.nb.interaccess.com

In article <43t7sh$[e-mail]>, [e-mail] (Bob Witte) wrote:

>   Geez, I must have pushed the "rec.radio.amateur.policy button" since
>   I'm clearly in the wrong newsgroup. Oops, no this really is
>   "rec.radio.amateur.homebrew".


Very witte, Bob.  :-)

Dave Moorman, K9SW
Downers Grove,
Illinois

--
Still looking for a snappy signature


From [e-mail] Mon Sep 25 19:34:07 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bulk Reply AMATEUR RADIO GONE COMMERCIAL
Date: 23 Sep 1995 12:44:17 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 29
Sender: [e-mail]
Message-ID: <441dh1$[e-mail]>
References: <thomas.g.booth-220995182000@160.205.101.24>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

<< A review of the Proceedings of the IEEE, IEEE Transactions
on Antennas & Propagation, and IEEE Transactions on Electromagnetic
Compatibility (just to name a few periodicals) from 1967 onward will
reveal
a fair amount of papers written on the application of the Method of
Moments
to a variety of problems.

TGB

 >>
Thanks TGB,

Now let me ask a silly question. What part of "MOM" relates to
understanding how to operate, construct, or maintain an amateur radio
station?

If it can only be found in specialized engineering textbooks or
publications from the 70's, and if it is only one method of analysis
method dealing with EM fields, why the heck did someone stick it in an
amateur exam? Or is the object of the new Ham tests just to test
memorization instead of understanding?

The guy complaining may have gone a little overboard, but let's be
honest.....it is a obscure question to place in an amateur radio test.
Especially when fundamentals are often misunderstood and yet much more
important.

73 Tom


From [e-mail] Mon Sep 25 19:34:09 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!news.pubnix.net!usenet
From: Mark Hillier <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Cable TV Converter Schematics for Spectrum Anal.
Date: 24 Sep 1995 00:17:29 GMT
Organization: HVW Technologies
Lines: 23
Distribution: inet
Message-ID: <44282q$[e-mail]>
NNTP-Posting-Host: port95.pubnix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Hello,

I am still looking for a  SCHEMATIC for a cable TV converter; any make,
any model. This is to help a friend of mine with a project to 'repair' a
spectrum analyzer he has.

Thanks to all those who responded to me previous post. Alot of useful
info came to light. However, nobody seems to have an actual schematic!

Since these things are so cheap to produce, I expect that there were not
alot of places that bothered fixing them; so, no schematics. But they
have to *exist*.

Anyone  ?

As usual, happy to pay for photocopying etc..

Thanks,

Mark, VE2HVW

[e-mail]



From [e-mail] Mon Sep 25 19:34:10 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!ub!galileo.cc.rochester.edu!ceas.rochester.edu!atd.rochester.ny.us!al
From: [e-mail] (Al Davis)
Subject: Re: CAD tools and distribution was(Re: 2m to 6m Transverter
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
X-Newsreader: TIN [version 1.2 PL2]
References: <[e-mail]> <43mg1u$[e-mail]> <[e-mail]> <43roe4$[e-mail]> <[e-mail]>
Date: Sat, 23 Sep 1995 15:37:35 GMT
Lines: 50
Xref: grape.epix.net rec.radio.amateur.equipment:17249 rec.radio.amateur.homebrew:9594

Gary Coffman ([e-mail]) wrote:
: I'd like to see us standardize on a schematic distribution
: format, a netlist format, and a mechanical drawing format.
: Then form a rec.radio.amateur.CAD group where we could
: post such things, as well as Radio Designer and Spice
: files, Mathcad worksheets, etc. Since many of the CAD tools
: can handle several formats, and there are utilities to convert
: others, perhaps we should start with a survey of what tools
: the majority of us interested in this have in common and see
: if there are common formats we all share. I'll kick it off.

It is not just "have in common".  We need a format that is free and
will not become obsolete.  Unfortunately, the tool vendors like to
lock you in.  Not all of us use dos/windoze.  There is also Mac and
a variety of unix systems.

For netlists, Spice is the obvious choice, possibly with well
documented extensions.  Every good analog simulator either can use it
directly or has conversion utilities available.  (to the extent that
the features overlap)

For schematics, postscript seems like a good choice on a quick
glance, but there are problems.  The plus side is that some systems
have it built-in, and some printers use it directly.  Postscript
previewers are available for anything, sometimes free (Ghostscript).
All good drawing programs can generate it, at least indirectly.  The
down sides are that may not be editable, it may not be possible to
convert it back to something that it editable, and it is hard to
extract a netlist from it.  Some programs can edit a subset of
Postscript. (Illustrator)  But how do we convince the others to
stick to the subset that can be edited?

How about demanding an annotated Spice netlist?  It is easy to add
coordinates to each element.  How about 2 sets each -- one for
schematic, one for layout.  It is easy to make a tool to strip them
out for Spice.  It should be easy to patch the simulators to ignore
the extra fields.  The simulators could actually make use of the
layout info for interconnect analysis.  Since many schematic programs
will output a Spice deck, they could be changed to preserve the
locations.  Maybe someone could make a simple viewer for it, and make
it available on the net for free.  How about an anno-spice to
postscript converter?  (master's project, perhaps?) Any takers?

Please don't make me buy any particular tool, especially one that
doesn't run on my machine.  Free ones off the net are no problem, as
long as they have source and can be compiled on my machine.


--



From [e-mail] Mon Sep 25 19:34:11 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Composite-->RGB schems?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <43ltmr$[e-mail]> <[e-mail]> <43uuh9$[e-mail]>
Date: Sun, 24 Sep 1995 17:25:42 GMT
Lines: 22
Sender: [e-mail]

in <43uuh9$[e-mail]>, Richard Karlquist wrote:
: In article <[e-mail]>,
: >In article <43ltmr$[e-mail]> [e-mail] writes:
: >>Looking to convert a composite signal to an RGB (ie: video out -> VGA
: >>monitor, w/o PC intervention).  If you know where I can find a schem,
: >>could you email [e-mail]?   Thanks!

: October 1990 Radio & Electronics Magazine had an article that described
: a circuit for doing this.  A place called Harmonic Research in Paramus, NJ
: sells boards that implement the circuit in the article.  I built one and
: it works fine.  They also have boards to go from RGB to NTSC and other
: RGB stuff.

I built one for a friend and was impressed with the quality of the parts.
But I've heard the color processor chip has been obseleted by Motorola.
In addition, the output was only multisync EGA, as no scan rate conversion
was done.  We hooked it up to a CGA monitor to test it, and the analog
outputs combined with the TTL inputs on the monitor made for some interesting
special effects.

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



From [e-mail] Mon Sep 25 19:34:12 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!howland.reston.ans.net!plug.news.pipex.net!pipex!tank.news.pipex.net!pipex!in1.uu.net!solaris.cc.vt.edu!news.duke.edu!usenet
From: [e-mail] (james P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: crystal drive specs  How to measure?
Date: Sat, 23 Sep 1995 03:52:36 GMT
Organization: Duke University, Durham, NC, USA
Lines: 21
Message-ID: <4405b6$[e-mail]>
References: <43evsb$[e-mail]>
NNTP-Posting-Host: async32.async.duke.edu
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (PTracy) wrote:

>Here we go with project #12554.  I have built several crystal oscillators
>mostly of the colpitts and pierce variety.  One spec that I never complety
>understood is Drive power to the crystal.

        Drive power used to be important way back when tubes were used and
folks needed to squeeze the maximum number of watts out of the minimum
number of tubes.  In that case it was often a single-tube power
oscillator connected to an antenna!  When you're pushing a 6V6
oscillator to cherry-red plate condition, it's easy to get enough
feedback through the crystal to damage it.

        Nowadays, unless you are trying stunts like that, drive power maximums
and crystal currents are something you should never have to worry
about.

        Jim "no sig" Meyer





From [e-mail] Mon Sep 25 19:34:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!news3.noc.netcom.net!zdc!zippo!user
From: [e-mail] (Dave Calhoun)
Subject: Crystals in cordless phone
Sender: [e-mail]
Nntp-Posting-Host: 205.162.195.21
Organization: household
Message-ID: <AC8A1B3D9668175ED1@205.162.195.2>
Date: Sun, 24 Sep 1995 04:14:53 GMT
Lines: 28

I have a cordless phone that has stopped working. It emitted harsh static
and then nothing. I thought it was the battery and hooked a 9v battery to
it. I heard static, but no dial tone. I popped it open and tested a few
components (I am not big into electronics). I noticed that there were two
boards inside. The first board had two of what I believe are crystals. They
are pink and about 1/2 inch square approx. They are as follows:
QX-293
16.5567

QX-359
46.155

There is another crystal on the other board marked:
qx-237
4.192

I used an ohm meter to see if there was any resistance on these. Only the
one marked 16.5567 had resistance. Also, on the first board there is
written:
tx rx 4890

Can anyone tell me a little bit about what I am seeing? I figure at the
very least I can salvage the 9v out of the unit and convert it for use with
my handheld although the handheld wants 12v. Will that damage it if I use
only 9v?
dave




From [e-mail] Mon Sep 25 19:34:14 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news1.cle.ab.com!usenet
From: Ed Lieser <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Even simpler NE602 question
Date: 24 Sep 1995 21:50:18 GMT
Organization: Allen-Bradley Co.
Lines: 7
Distribution: inet
Message-ID: <444jqq$[e-mail]>
NNTP-Posting-Host: trier.cle.ab.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2b5 (Windows; I; 32bit)


Where can they be obtained?  Mouser and Digi-Key both said
they don't stock this part.  While I'm asking questions, I
may as well inquire as to the price, too.  :-)

Ed Lieser



From [e-mail] Mon Sep 25 19:34:15 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!newsxfer.itd.umich.edu!news.eecs.umich.edu!newshost.marcam.com!uunet!in1.uu.net!noc.near.net!aquila.sni-usa.com!news.sni.de!news
From: [e-mail] (W.F.Schroeder)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HamView Products on the WWW
Date: Mon, 25 Sep 1995 12:40:16 GMT
Organization: none
Lines: 15
Message-ID: <44681p$[e-mail]>
References: <43ftt9$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: django.pdb.sni.de
X-Newsreader: Forte Free Agent 1.0.82

Paul Keezer <[e-mail]> wrote:

>Finally a WWW page has been set up for HamView products, a
>Windows based Ham Radio program.  This page can now be located
>at http://www.tiac.net/users/pkeezer/hamview.htm
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

All i got was:

403 Forbidden

Your client does not have permission to get URL
/users/pkeezer/hamview.htm from this server.




From [e-mail] Mon Sep 25 19:34:16 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!darwin.sura.net!jabba.ess.harris.com!news.ess.harris.com!usenet
From: [e-mail] (kennedy)
Newsgroups: rec.radio.amateur.homebrew
Subject: High Voltage Capacitors
Date: 21 Sep 1995 12:54:30 GMT
Organization: Your Organization
Lines: 2
Message-ID: <43rna6$[e-mail]>
NNTP-Posting-Host: mtde08.mtp.semi.harris.com
Mime-Version: 1.0
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X-Newsreader: WinVN 0.92.6

Can anyone tell me of a vendor who can supply a 2000WVDC capacitor
with a value of at least 1000ufs??


From [e-mail] Mon Sep 25 19:34:17 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!news.cerf.net!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: High Voltage Capacitors
Date: 24 Sep 1995 23:01:08 GMT
Organization: JP Accelerator Works, Inc.
Lines: 29
Message-ID: <444nvk$[e-mail]>
References: <43rna6$[e-mail]>
NNTP-Posting-Host: dial132.roadrunner.com
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

[e-mail] (kennedy) wrote:
>Can anyone tell me of a vendor who can supply a 2000WVDC capacitor
>with a value of at least 1000ufs??

Chicago Condenser 312-227-7070
Condenser Products 800-382-6874
High Energy Corp. 800-732-5405

All of these should be capable of meeting your needs in quantities from
1 to many.  There are many others listed in the "Capacitors, High
Voltage" section of the Thomas Register.   I have purchased capacitors
uot to 5,000 joules energy storage from all of the above.  As I recall
High Energy Corp had the best prices for one offs, but the others rapidly
dropped in price as a function of quantity.  Be sure to give them
sufficient information about your application.  Peak discharge current,
RMS current, and frequency of charge-discharge cycles are important
parameters that can affect the design (and size and price) of a
capacitor.  If they don't ask for such information beware!




--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]




From [e-mail] Mon Sep 25 19:34:18 1995
Path: grape.epix.net!news.sprintlink.net!news.uoregon.edu!news.algonet.se!usenet
From: [e-mail] (Christer Johansson)
Newsgroups: sci.electronics,comp.robotics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: List of Stamp Applications
Date: Sun, 24 Sep 1995 18:04:25 GMT
Organization: HTH
Lines: 67
Message-ID: <444a1k$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sophocles.algonet.se
X-Newsreader: Forte Free Agent 1.0.82
Xref: grape.epix.net sci.electronics:144530 rec.radio.amateur.homebrew:9604 rec.radio.amateur.misc:86932

Hi,

I've started to compile a "List of Stamp Application" (L.O.S.A for
short). I think there are lots of *GREAT* ideas and problems solved
with the BASIC Stamp and the main purpose of this list is to read
what other people are using their BASIC Stamps for and maybe get
some inspiration or hints.

So if you have done something with the BASIC Stamp (small or big)
that you are willing to tell others please use the form below and
write a short description, nothing fancy is needed just a simple
explanation. If you have source code to share thats even better but
it's not necessary.

Then e-mail the form to:

     [e-mail]

With the following as the subject:

     L.O.S.A Contribution

When there are a bunch of contributions I'm going to post the L.O.S.A
to this newsgroup and upload it to Parallax, Inc. FTP-site. I will
update it approx. once a month.

[--- cut ---]

======================================================================
                    - L.O.S.A Contribution Form -
======================================================================
 Title :
 Author:
 E-mail: (optional)
----------------------------------------------------------------------

 Stamp model    : BASIC Stamp/BS1-IC/BS2-IC
 Code available : YES/NO
 Filename       : (optional)
 FTP-site       : (optional)
----------------------------------------------------------------------
 Description    : (5-50 rows describing your application)












======================================================================

[--- cut ---]

/Christer

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon - Christer Johansson - * email: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
    >> World Wide Web - http://www.algonet.se/~cj/catalog.html <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Mon Sep 25 19:34:19 1995
Path: grape.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Litz Wire
Date: Sun, 24 Sep 1995 13:23:39 -0700
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 24
Message-ID: <[e-mail]>
References: <4424gd$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <4424gd$[e-mail]>

Hi OM.  You must be one of the LOWFERS that experiment in the 160 to 190
kHz range! Yes indeed Litzendraht wire is still available but horribly
expensive.  The only source I know of is:  Kerrigan-Lewis Wire Products,
4421 West Rice Street, Chicago, Ill  60651.  Telephone [phone]

Getting information on the use of Litz wire is even more difficult.  The
best write up on this is in the LOWDOWN newsletter for April 1987 where
the Hudson Wire Company 1962 Technical Inforamtion Guide is reproduced.

For the very basics, you must go back to Fred Terman, "Radio Engineering
Handbook" First Edition 1943.  Subsequent editions will NOT do.  This
issue is a collectors item nowdays!  73 and luck Cliff Buttschardt W6HDO

On 23 Sep 1995, Thomas Guillaume wrote:

> Can anyone tell me where I can purchase, mail order or otherwise, Litz
> wire.
>
> Thanks.
>
> [e-mail]
>
>
>


From [e-mail] Mon Sep 25 19:34:21 1995
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Path: grape.epix.net!news.sprintlink.net!news.tyrell.net!tyrell.net!bowers
From: John Bowers <[e-mail]>
Subject: Re: Need your input for Surplus Land Mobile Radio FAQ
In-Reply-To: <43n25h$[e-mail]>
X-Nntp-Posting-Host: tyrell.net
Content-Type: TEXT/PLAIN; charset=US-ASCII
Message-ID: <[e-mail]>
Sender: [e-mail] (*)
Organization: Tyrell Corporation - 800-TYRELL-1 - POP's in 504/816/913/316
References: <43n25h$[e-mail]>
Mime-Version: 1.0
Date: Sun, 24 Sep 1995 04:19:38 GMT
Lines: 52
Xref: grape.epix.net rec.radio.amateur.misc:86905 rec.radio.amateur.homebrew:9597 rec.radio.amateur.equipment:17259

Tom
read your msg on putting these older radios back in service on the ham
bands.  My son and I bought some Motorola Mitreks and are converting
them.  These were a matter of recrystaling and replacing one cap and
rewinding a small coil.  All this is done in the frequency elements and
then retuning the radio.  I have had good luck with the first one (just
finished it).

I would like info on the conversion of a 450 Mhz MICOR.

Let's discuss

John K9UTK


On 19 Sep 1995, Tom Randolph wrote:

>
> What the heck, let's make it official:
> I'm willing to compile a FAQ, all about those surplus police and taxicab
> radios and converting them for ham-band use... you know, the ones you always
> hear on the air 'cuz somebody converted one: Motorola Mitrek, GE Master II,
> Phoenix, Delta, blah, blah, blah. There's dozens of these things available for
> cheap money, and I'm sure a lot of us would like to know which ones to look
> for, and which to skip over, as their performance often beats the imported
> synthesized rigs!
>
> In particular, what I want to get is information on how to identify the
> particular models, what band they're on, crystal or synth, whether they're an
> easy conversion, need a fair amount of work and skill, or are impossible, and
> how to tell all of this by looking at them and reading the model/serial
> numbers. Also, it'd be good to know if a full manual with schematics and
> tune-up procedure is available, from either the manufacturer or a Sam's
> photofact type publication.
>
> I don't really want to start a database of HOW to do the mods. That would be
> difficult without graphics, and would occupy megabytes! This should be fairly
> easy to deduce from the tune-up procedure and other details in the manual.
>
> WHY do this?
> 1) I'm interested - I've passed over a lot of these at fleas, for lack of any
>    information about what I was looking at.
> 2) It doesn't seem to exist anywhere else. A lot of hams have some knowledge
>    about some radios, no one has written it all up.
> 3) Put these radios back to work, and save them from the scrapyards!
>
> So there it is... all info, pointers, literature references appreciated! Send
> to me at: [e-mail]
>
> -Tom R.   N1OOQ   [e-mail]
>
>


From [e-mail] Mon Sep 25 19:34:22 1995
Path: grape.epix.net!news.sprintlink.net!in1.uu.net!taligent!apple.com!apple.com!not-for-mail
From: [e-mail] (Kok Chen)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Patch Antennas -- References??
Date: 22 Sep 1995 15:42:11 -0700
Organization: Apple Computer, Inc., Cupertino, California
Lines: 22
Message-ID: <43ve43$[e-mail]>
References: <43s8o4$[e-mail]>
NNTP-Posting-Host: apple.com
Xref: grape.epix.net rec.radio.amateur.homebrew:9590 rec.radio.amateur.misc:86858

[e-mail] (Jim Weir) writes:

>It is also out of library.  My library did a data search and came up
>empty.  Does anybody know either (a) where I can get my hands on a
>copy of this book even if only for a day or (b) another good reference
>text for patch antennas.  Neither Jasik nor Hamsher (my two antenna
>bibles) make any reference to a "patch" antenna.


In the Third Edition of Jasik (edited by R. C. Johnson), patch antennas
are discussed in chapter 7, Robert E. Munson, "Microstrip Antennas."

The second edition of Kraus also has a section on patch antennas.

If all else fails, I do have a copy of the book you are looking for.
Pretty rudimentary stuff, and a bunch of BASIC programs in that book.
You are far better off with Jasik and Kraus; believe me.

73

Kok Chen, AA6TY                         [e-mail]
Apple Computer, Inc.


From [e-mail] Mon Sep 25 19:34:23 1995
Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!sgigate.sgi.com!enews.sgi.com!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.oanet.com!dialin1.oanet.com!ve6nap
From: [e-mail] (Gerald Caouette)
Newsgroups: rec.radio.amateur.homebrew
Subject: Require Tube info on  8987M
Date: Sat, 23 Sep 1995 01:01:50
Organization: OA Internet SLIP client
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: dialin1.oanet.com
Keywords: Tube , Help ,
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

I have recently obtained a 8987M Tube Made in England
The tube Filiment is rated at 12.6 Volts  and this information is  printed on
the tube , But no other info : I have looked in the Eimac Power Grid tube Cat
1993 Version But no luck

I would like to get all the tech spec for the tube  if possible
or at least connecion info and voltage and power ratings .... Element
capacitence and other info would also be nice.

Regards
Gerald Caouette
ve6nap @ oanet.com

73 de ve6nap




From [e-mail] Mon Sep 25 19:34:24 1995
Path: grape.epix.net!news.sprintlink.net!news.inc.net!news.moneng.mei.com!sol.ctr.columbia.edu!howland.reston.ans.net!newsjunkie.ans.net!news-m01.ny.us.ibm.net!usenet
From: [e-mail] (Jose Antonio Gonzalez)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: SUPER KEYER CMOS III
Date: Mon, 25 Sep 1995 09:31:05 GMT
Lines: 12
Message-ID: <44640h$[e-mail]>
NNTP-Posting-Host: slip145-2.ut.nl.ibm.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: grape.epix.net rec.radio.amateur.equipment:17288 rec.radio.amateur.homebrew:9613

Hello!

I would like get the QST's review of this keyer. May some one send it
to me, previous send of green stamps, of course?

Many thanks and 73 from Spain

--
__________________________________________________________________________
Jose Antonio Gonzalez Lorenzo --- [e-mail] ---  Amateur Radio: EA2BSN
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



From [e-mail] Mon Sep 25 19:34:25 1995
Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!newshost.marcam.com!usc!howland.reston.ans.net!swrinde!sgigate.sgi.com!atha!unixg.ubc.ca!van-bc!io.org!innuendo.tlug.org!telly!whome!gts!reptiles.org!westonia!humnet.humberc.on.ca!hduff
Subject: Ten Tec T-Kits
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Wed, 20 Sep 95 21:49:04 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 41


>
> I talked today to someone at Ten Tec about their T-Kit line. Actually I
> placed an order. Anyway, Ten Tec is still firmly behind their kit line
> even though they never advertise, and the latest catalog I have is over a
> year old.
>
> I guess we've all heard about the impressive 2meter radio kit Ten Tec was
> to release over a year ago. Believe it or not, it has still not been
> released. The gentleman on the phone said they were still trying to work
> some problems, but were hoping to release it soon.
>
> Has anyone built any of their kits before?
>
> Mark, KE4IOF
>

I built one of the Ten-Tec "T-Kit" 6 meter transverter kits...
Works quite well, uses discrete components (easier,cheaper repairs
if necessary). Includes EVERYTHING...all parts, case, switches,
connectors, wire...
The manual was very comprehensive, Tuning was simple.
Mine worked the first time ! I use it with a TS-50 in the car...
Worked about 50 grids including some rare ones this past spring.
Without hesistation, I recommend it to anyone who already ownes an
HF rig and wants to check out 6 meters.  The best $100 I've spent on
the hobby in years !

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 Sep 25 19:34:25 1995
Newsgroups: rec.radio.amateur.homebrew
Path: grape.epix.net!news.sprintlink.net!in2.uu.net!cs.utexas.edu!swrinde!sgigate.sgi.com!uhog.mit.edu!news.mtholyoke.edu!news.umass.edu!news.hampshire.edu!hamp!aswNS
From: [e-mail] (Albert S Woodhull)
Subject: UHF brick amp data needed
Message-ID: <9177cb$[e-mail]>
Date: Sun, 24 Sep 1995 01:01:07 GMT
Organization: Hampshire College, Amherst MA
X-Newsreader: TIN [version 1.2 PL2]
Lines: 11

Can anyone supply me with some specs on a TRW MX12-3 440-470 Mhz
"brick" amplifier? I need to know at least voltage and drive power
limits, more info would be very nice.

Thanks, Al N1AW

--
Albert S. Woodhull, Hampshire College, Amherst, MA
[e-mail]
[e-mail]
413-549-2962



From [e-mail] Mon Sep 25 19:34:26 1995
Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!news-m01.ny.us.ibm.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Uniden Pro510xl
Date: 25 Sep 1995 03:45:24 GMT
Lines: 5
Message-ID: <4458kk$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 129.37.210.99
X-Newsreader: IBM NewsReader/2 v1.03

Hello All,

Any one have schematics for a Uniden Pro510xl. I want to butcher mine....

Raymond Tant


From [e-mail] Mon Sep 25 19:34:27 1995
Path: grape.epix.net!news.sprintlink.net!bga.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Want VAC VARI CAP.
Date: 24 Sep 1995 19:52:06 GMT
Organization: Real/Time Communications - Bob Gustwick and Associates
Lines: 5
Message-ID: <444ct6$[e-mail]>
NNTP-Posting-Host: jake-5o.ip.realtime.net
X-Newsreader: AIR News 3.X (SPRY, Inc.)

I need a vacum variable capacitor, about  5-6 KV, min cap. 20-50pf  max.cap 500-750pf ceramic or glass
ok.  I have a space resriction of 4" max dia. 8" max. long.
If you have what I need pls. E-mail me.
                                                                         Thanks, Matt/KK5DR



From [e-mail] Mon Sep 25 19:34:28 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] (EricNess)
Newsgroups: rec.radio.amateur.homebrew
Subject: Where to Find 40673 MOSFET
Date: 24 Sep 1995 01:20:18 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <442pqi$[e-mail]>
Reply-To: [e-mail] (EricNess)
NNTP-Posting-Host: newsbf02.mail.aol.com

Many of the projects in ARRL publications specify the RCA 40673 dual gate
MOSFET.  I understand that this part has ben discontinued so, can anyone
recommend suitable replacement or better yet, does anybody know of a
surplus outlet that still has some old stock.