World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_04/_homebre.txt

Text File | 1997-02-01 | 344KB | 9,506 lines

The World of Ham Radio CD-ROM



From [e-mail] Fri Apr 05 16:17:53 1996
From: douglas <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 3 Apr 1996 23:10:46 GMT
Message-ID: <4jv0hm$[e-mail]>

i'm very new to this amateur radio thing.  tell me what i would need to
reach a 10 mile radius.  including amps, antenna, etc.




From [e-mail] Fri Apr 05 16:17:53 1996
From: [e-mail] (KN5S)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6m hb transverter
Date: 1 Apr 1996 04:37:51 -0500
Message-ID: <4jo85f$[e-mail]>
Reply-To: [e-mail] (KN5S)

A state-of-the-art  6 meter transverter design was described by Zack
Lau in QEX, Sept., 1995, publ. by ARRL.

73,  Mark  KN5S     [Mark  Mandelkern,  Las Cruces,  NM]


From [e-mail] Fri Apr 05 16:17:54 1996
From: [e-mail] (Murray Treyvaud)
Newsgroups: rec.radio.amateur.homebrew
Subject: 6m hb transverter
Date: 2 Apr 1996 20:30:41 +1000
Message-ID: <4jqvkh$[e-mail]>
Summary: 6m hb transverter

i previously posted a request for info on the cheesebit 6m transverter.
harry brown w3iit replied with a mail address [e-mail]
unfortunately that address does not work for me.
harry please send me a mail with your address to
[e-mail]
thanks
murray



From [e-mail] Fri Apr 05 16:17:56 1996
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6m XCVR project
Date: 5 Apr 1996 17:28:39 GMT
Message-ID: <4k3l87$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>,
Eric M. Brombaugh <[e-mail]> wrote:
>Hello,
>
>I've recently become interested in 6m operation, and have started a small
>project to build a 6m FM Transceiver.  I'm basing the whole thing on a
>bunch of Motorola parts which were originally intended for cordless phones.
>
>I started with the reciever, based on an MC3362 Dual Conversion FM reciever.
>It looks pretty good on paper, and overall it works pretty well.  I use an
>MC145162 PLL chip to lock the first LO, and the 10.245 2nd LO as the input
>to the reference divider.
>
>As it stands right now, the thing has a sensitivity of about -100 dBm.  This
>is about 20 dB off of what it should be able to do, and I think I know why:
>Looking at the 1st LO on a spectrum analyzer, it is REALLY messy.  I have
>tried all the common solutions to phase noise in PLLs - wider loop bandwidth,
>regulation of the Phase Detector and VCO supplies, boosting the VCO output
>levels into the feedback divider, but no improvments yet.

The MC3362 isn't all that sensitive by itself - around -100dBm if I
recall correctly.  If you want more sensitivity, you'll need to
add a pre-amp, but keep in mind the MC3362 mixer isn't all that strong.

Increasing the loop bandwidth can reduce the close-in phase noise
of the VCO if your reference oscillator is clean enough, but the
trade-off is that you'll probably see increased reference sideband
levels.  I'd suggest keeping the loop bandwidth below 50Hz and the
damoing around .6 - .8.

If the regulator used for the VCO and PD supply is very noisy, that
will show up in the output spectrum.

The loop divider in the MC145162 only requires a volt of so of
p-p amplitude, I doubt this is your problem..

>So, anyone have any ideas on other things to do to clean up that LO?

To begin with, the LO not be your problem at all.  Check your input
match to the MC3362 - you might be able to pick up 10dB here if you're
not properly matched to the Rp=660 + Cp = 7.2pF input impedance
specified in the data sheet.  A balun wound on a ferrite core would
probably do the trick here.  Also, to get a sensitivity better
than -107 dBm, you'll probably need a pre-amp.

If the VCO really is problem, the best thing you can do is make
sure the VCO tank Q is as good as possible and then use only the
minimum necessary VCO gain to maintain lock over the desired tuning
range under the intended range of operating conditions.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are mine and should *
 * [phone]               | not be interpreted or represented as     *
 * [e-mail]      | those of Sun Microsystems, Inc.          *



From [e-mail] Fri Apr 05 16:17:58 1996
From: [e-mail] (Steve Drury)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6m XCVR project
Date: Fri, 05 Apr 1996 21:43:44 GMT
Message-ID: <3165939c.11293623@194.72.192.4>
References: <[e-mail]> <4k3l87$[e-mail]>
Reply-To: [e-mail]

Perhaps I can help with my experiance of 2 to 6M design,

>>I started with the reciever, based on an MC3362 Dual Conversion FM reciever.
>>It looks pretty good on paper, and overall it works pretty well.  I use an
>>MC145162 PLL chip to lock the first LO, and the 10.245 2nd LO as the input
>>to the reference divider.

In my designs I use an MC3371, this device provides IF amplification
squelch and S meter outputs. For the front end I use a dual gate
mosfet (actually has too much gain and had to be biased to a lower
gain for 6M operation to give sensible S meter response), the mixer
was a simple junction FET with LO injected into the source feeding
four poles of crystal filter and then on to the IF chip.

>Increasing the loop bandwidth can reduce the close-in phase noise
>of the VCO if your reference oscillator is clean enough, but the
>trade-off is that you'll probably see increased reference sideband
>levels.  I'd suggest keeping the loop bandwidth below 50Hz and the
>damoing around .6 - .8.

I found it very hard to eliminate spurious noise from the VCO when
using the Motorola synth. chips, but turning to the Philips TSA1057
made the loop filter very simple and very little reference frequency
gets through to the VCO.

For info. on how I did it follow the HTML text on my WWW page
html://homepages.enterprise.net/hamlab/ for the piccolo transciever.



From [e-mail] Fri Apr 05 16:17:58 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: [Q] Help! Building RF Dector For 18mhz - 22mhz
Date: Wed, 03 Apr 96 09:10:03 PDT
Message-ID: <[e-mail]>


I am looking to build a receiver for detecting RF from Jupiter.
The range must cover 18Mhz - 22Mhz. I'd like to be able to tune in
500Khz increments. The output will be directed to a 12-bit A/D for
sampling. Any information, books to refer to, or existing schematics
would greatly be appreciated. Keep in mind that I do not have an
extensive RF design background.


Gary



From [e-mail] Fri Apr 05 16:18:00 1996
From: Jaded <[e-mail]>
Newsgroups: aus.radio.amateur.misc,rec.music.makers.guitar.tablature,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,alt.radio.pirate
Subject: A newbie needs help settingup local
Date: 3 Apr 1996 19:57:44 GMT
Message-ID: <4jul7o$r9b$[e-mail]>

I am interested in setting up a local radio channel with a 1000m
radius.  I want to do this cheaply, But I do have several
investors, so the total can at most be $100.

Thanks in advance!
Jade El'Muerte

--


Jaded


From [e-mail] Fri Apr 05 16:18:00 1996
From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: Air core coils?
Date: 4 Apr 96 20:06:16 GMT
Message-ID: <[e-mail]>

        Where do you get large air core coils now days?

Say 3 or 3.5 inches in dia and 8 or 10 TPI.

  73
  Bill ko4ww

  William L. Fuqua III  P.E.  E-mail [e-mail]  Phone [phone]
5
  Department of Physics and Astronomy      CP-177 Chem. Phys. Bldg.
  University of Kentucky ,                 Lexington, Ky 40506-0055





From [e-mail] Fri Apr 05 16:18:01 1996
From: "Lorelei Lindenaux (SAR)" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Astro 200 Transceiver
Date: Wed, 3 Apr 1996 20:39:06 -0500
Message-ID: <Pine.SUN.3.91.960403203516.12364A-100000@virtu>

Hello:

My dad ahs an Astro 200 Transceiver 80M - 10M with factory installed 500
cycle CW filter.  Includes, Mic, AC power supply, DC cables and Spkr.
SASE brings Brochure.  Will ship US for $475.00.  Please e-mail me at
[e-mail]  or you may call my dad at 813-842-4818.
(New Port Richey Fla.)  My dads name is Maurice  W4NHP

                             Thanks,  Lorelei


From [e-mail] Fri Apr 05 16:18:02 1996
From: [e-mail] (Edward Kravitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Controlled Carrier AM (was Re: Transmitting tubes!)
Date: 3 Apr 1996 03:46:51 GMT
Distribution: world
Message-ID: <4jssbb$[e-mail]>
References: <4jlao4$[e-mail]> <4jmdbu$[e-mail]> <[e-mail]> <[e-mail]>

David :   I was under the impression that controlled carrier AM was being
used in other early rigs , ie:  Heathkit  DX-35,40,and 60  and  Knight T-
60, 150
Hallicrafters HT-40.  Check em out.



From [e-mail] Fri Apr 05 16:18:03 1996
From: [e-mail] (Alan Peake)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Conversion of noise voltage into noise figure ?
Date: Mon, 1 Apr 1996 11:27:36
Message-ID: <[e-mail]>
References: <4im80h$[e-mail]> <4io1df$[e-mail]> <[e-mail]> <[e-mail]>


>That said, I step on the slippery slope and state that the generally accepted

>definition of noise figure is noise factor expressed in dB, e.g. a noise
>factor of 2 is a noise figure of 3.01 dB. This is in opposition to Alan's
>usage.
No, I accept that definition. Most formulae for sensitivity just use noise
figure but I recently came across the form I gave. This is in "Reference
Data for Radio Engineers" in Section 29-8. It uses the following formula.

            dBm at input = -198.6 +10*logB + 10*log(Te)
where Te is the effective noise temperature of the receiving system and is
given by
           Te = Ta + (LF - 1) * To
where Ta  = antenna temp., L= line loss factor, F= noise factor and To is
ambient temp.
Replace the antenna and line with an ideal signal generator (Ta=0, L=1) and
10*log(Te) becomes 10*log((F-1) * To) or 10*log(F-1) + 10*log(To).
For To=290, dBm at input is now -174 + 10*logB + 10*log(F-1)
It doesn't matter for large noise figures i.e. where noise factor>>1 but
consider a noise figure of 0dB (noise factor = 1) This is a noiseless
amplifier and thus should have an infinitely small sensitivity which this
formula gives. 10*log(1-1) is very small!
So why doesn't the -174 + 10*logB + noise figure give infinite sensitivity for

a perfect amplifier (noise figure = 0)?

>letting B = 1 and using the log form, 10*log(kT) = -204 dBw = -174 dBm. Note
>that Alan used -174 for dBw, which is also incorrect.
Oops! you're correct.



From [e-mail] Fri Apr 05 16:18:05 1996
Newsgroups: rec.radio.amateur.homebrew
From: Monty Wilson <[e-mail]>
Subject: Direct-modulated AM with solid state final?
Message-ID: <[e-mail]>
Date: Thu, 4 Apr 1996 20:08:58 GMT

AMers:

Call me unamerican, but I like my no-tune transistor rig.
Right now I'm running a Yaesu FT747 which even has a fair
AM receiver in it.

Unfortunately the AM transmitter is low-level modulated
of course.

I know a lot of "real AMers" have built plate-modulated
transmitters.  I know because I've heard the wonderful
signals from your stations.  I only run AM on 10m; it's
my favorite band for just about everything including
spreading out above 29 MHz and having fun talking to all
you guys that have built your own equipment with nuvistors
in the front end, etc.  As soon as the spots come back,
we'll talk again on 10 meters.

What I want to know is: has anyone managed to take a late-
model solid state transceiver (like mine) and modify it to
run collector- modulated AM?  Other than finding or winding
a modulation transformer, it would seem relatively simple
to modify a solid-state rig like this, and you could run
a 40W carrier, which on 10m would be plenty.

Has anyone tried this?

I figure I have a few years to work on this one, until the
sunspots come back from the dead.

--
.........Monty.
[e-mail]




From [e-mail] Fri Apr 05 16:18:05 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct-modulated AM with solid state final?
Date: 5 Apr 1996 15:28:22 -0500
Message-ID: <4k3vp6$[e-mail]>
References: <4k3o3d$[e-mail]>

When collector modulating a solid state amplifier, the following
conditions must be met:

1.) The driver must also be modulated. This is because driver power
"leaks" directly through the PA to the output. Unless the drive power is
also modulated the correct amount, you won't be able to get more than 80
or 90 percent modulation.

2.) The PA and driver must be class C. If a stage is operating in a linear
mode, it will be impossible to modulate it without severe distortion.

Without meeting these requirements, a solid state PA can not be correctly
collector modulated no matter what components are used. You can bet
meeting this criteria isn't easy.

I think someone else hit it right on the head. If you want to high level
modulate, plug in a stage designed to do that. You'll gain 30 percent
collector efficiency, and it won't sound a bit better than proper low
level modulation.

73 Tom


From [e-mail] Fri Apr 05 16:18:06 1996
From: [e-mail] (Robert P. Murray Jr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Eimac tube info
Date: 1 Apr 1996 05:21:21 GMT
Message-ID: <4jnp4h$[e-mail]>
References: <4j7thd$[e-mail]>

In article <4j7thd$[e-mail]>, [e-mail]
says...
>
>
>Does anyone have the specs on an Eimac 7609?

The 7609 is identical to a 4X150A with the exception of a 26.5v, 0.51a
filament.  It was listed in their "Quick Reference Catalog 175" but not
in QRC 181, except as a replacement.  By this time, it's probably been
discontinued, but was made at the San Carlos, CA plant

Bob, KA7HLB :{)



From [e-mail] Fri Apr 05 16:18:07 1996
From: [e-mail] (Ashapiro00)
Newsgroups: rec.radio.amateur.homebrew
Subject: Flavorig!
Date: 2 Apr 1996 09:56:46 -0500
Message-ID: <4jrf7e$[e-mail]>
Reply-To: [e-mail] (Ashapiro00)

Has anyone built the Flavorig! from a Nov. 89 73 Amateur Radio magazine
article? It is an 80M CW transceiver based on a Radio Shack Flavoradio.
Any details would be appreciated.


From [e-mail] Fri Apr 05 16:18:08 1996
From: Lennart Nilsson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: G2DAF linear amplifier
Date: 2 Apr 1996 16:47:10 GMT
Message-ID: <4jrlme$[e-mail]>

I'm building a HF-PA with three 813's in grounded grid but I
would like to try the G2DAF grid-driven design instead. Has
anybody compared efficiency and linearity between those circuits?
- SM5DFF



From [e-mail] Fri Apr 05 16:18:09 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (David Stockton)
Subject: Re: G2DAF linear amplifier
Message-ID: <[e-mail]>
Date: Wed, 3 Apr 1996 15:22:19 GMT
References: <4jrlme$[e-mail]>

Lennart Nilsson ([e-mail]) wrote:
: I'm building a HF-PA with three 813's in grounded grid but I
: would like to try the G2DAF grid-driven design instead. Has
: anybody compared efficiency and linearity between those circuits?
: - SM5DFF


   The novelty of the G2DAF design was in using the incoming RF to power
the screen grid supply. The grounded cathode configuration gives somewhat
more gain than grounded grid, but the screen supply keeps the drive power
requirement up. It is difficult to find seniconductor diodes that are
fast enough to work well in this circuit at the necessary voltage
ratings. The original used thermionic rectifier valves.

   With a 100Watt exciter, I'd suggest the grounded grid for its good
linearity and freedom from neutralising/decoupling difficulties. Grounded
grid passes exciter power to the load and so might just be noticably more
efficient...

    Cheers
           David  GM4ZNX


From [e-mail] Fri Apr 05 16:18:11 1996
From: [e-mail] (Robert A. Lanier)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Ham Radio Article
Date: Tue, 02 Apr 1996 14:22:46 GMT
Message-ID: <4jrcu6$[e-mail]>

I am trying to get a copy of the article "Digital HF Radio A Sampling
of Techniques" by Rohde. It was published in Ham Radio magazine in
April 1985.

Does anyone have a copy of this article or know of a source for it? I
would be willing to pay all shipping costs.

73s de
Tony,  KE4ATO
[e-mail]



From [e-mail] Fri Apr 05 16:18:12 1996
From: [e-mail] (Richard Todd Perry)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Handheld batteries help, please
Date: Wed, 03 Apr 1996 21:49:57 GMT
Message-ID: <4jurq7$[e-mail]>

Does anyone remember the name and adress of the place that does the
really good (and cheap) reconditioned/used handheld batteries? I can't
seem to find it around here...

Thanks!

Regards,

R. T. Perry
[e-mail]
KF4BAL
GMOO

- The world is divided up into two groups of people: Those that use HP's, and
those that yell "HEY! Where's the equals sign!"



From [e-mail] Fri Apr 05 16:18:13 1996
From: [e-mail] (Gustavo D. Leizerovich)
Newsgroups: rec.radio.amateur.homebrew
Subject: HF SSB Selective Call
Date: Fri, 5 Apr 1996 10:46:49
Message-ID: <[e-mail]>

HF-SSB Selective Call Units.
Brand new in the box.
Compatible with any SSB radio.
Excellent performance in poor S/N environments.
Ackback and Busy modes of operation.

Price:  $99 each

Gus Leizerovich
[e-mail]



From [e-mail] Fri Apr 05 16:18:14 1996
From: [e-mail] (HH357)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to make rubber stamps ?
Date: 1 Apr 1996 21:34:01 -0500
Message-ID: <4jq3mp$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (HH357)

There is a store in Santa Barbara, CA called Stampa Barbara.
Try them.    cheers


From [e-mail] Fri Apr 05 16:18:15 1996
From: [e-mail] (Franky Noten)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: How to setup an dual computerlink via radio. Is it possible ?
Date: Mon, 01 Apr 1996 18:24:15 GMT
Message-ID: <4jp38s$[e-mail]>


I would like to setup an link between 2 computers.
What's the maximum speed I can transmit on ?
Please give some solutions.

Thanks.



From [e-mail] Fri Apr 05 16:18:16 1996
From: Mark Schoonover <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: How to setup an dual computerlink via radio. Is it possible ?
Date: Wed, 03 Apr 1996 13:49:36 -0800
Message-ID: <[e-mail]>
References: <4jp38s$[e-mail]> <4jt8cm$[e-mail]>

[e-mail] wrote:
>
> Franky Noten <[e-mail]> wrote:
>
> >I would like to setup an link between 2 computers.
> >What's the maximum speed I can transmit on ?
>
> The speed of light.

^^^^^^^^^^^^^^^^^^^^^

Well, That's not entirely true. Electrons move slower through copper
wire than throught the void of space.
>
> >Thanks.
>
> You are welcome.

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mark Schoonover -- KA6WKE                   E-Mail: [e-mail]
San Diego, CA
   Kenwood R-1000, BC2500XLT, PK232MBX/JVFAX, 66' Indoor Dipole
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


From [e-mail] Fri Apr 05 16:18:17 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Identity of the mystery coax and the invention of Gore-Tex!
Date: Wed, 03 Apr 96 04:44:59 GMT
Message-ID: <4jt064$[e-mail]>
References: <[e-mail]>

   [e-mail] (Jon Goguen) wrote:

>I don't expect to get the VSWR of 1.25 typical for these cables @ 18
>GHz, but if I can do as well as that at 2 GHz, I'll be reasonably
>satisfied.

Were you able to come up with any figures for the cable regarding loss
VS frequency?


From [e-mail] Fri Apr 05 16:18:18 1996
From: [e-mail] ( Timothy R. Linde)
Newsgroups: rec.radio.amateur.homebrew
Subject: In theory only.
Date: Mon, 01 Apr 1996 00:58:16 GMT
Message-ID: <4jn9n3$[e-mail]>

Although this may not be the right news group, it seemed to be the
likeliest place for this post.
For those of you who may have in days gone by used a test oscilator as
a transmitter, or learned how a local transmitter could over-ride an
amplifier in a juke box, here's a good "what if" type of question.
Does anybody know of something that will broadcast only 10-20 feet yet
over ride an amplifier with a squeel of chirp or something.?
I ask this on part of a couple who can't stand drive by's with loud
car stereos.
Personnally I don't notice if they're loud or not. (is that good or
bad?)
Like I said in the beginning, this is strickly in theory only for
reason of debate and information.


TRL



From [e-mail] Fri Apr 05 16:18:20 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: In theory only.
Date: Mon, 01 Apr 96 17:22:01 GMT
Message-ID: <4jp3p2$[e-mail]>
References: <4jn9n3$[e-mail]>

Post / CC by Mail

   [e-mail] ( Timothy R. Linde) wrote:

>Does anybody know of something that will broadcast only 10-20 feet
>yet over ride an amplifier with a squeel of chirp or something.?
>I ask this on part of a couple who can't stand drive by's with loud
>car stereos.

You could probably build a jammer for the entire FM band, but that
won't do much to a cassette deck or CD player.

I once had a friend who got so frustrated with people zooming through
his neighborhood, making it unsafe for kids to play, that one day he
threw a rock through a car's side window.

The driver got out of the car swearing like crazy and started towards
the guy, who promptly walked into his garage and reemerged with a 12
gauge.  End of argument.

Maybe your neighborhood should consider installing gates to control
traffic flow?

73,
Jack  WB3U


From [e-mail] Fri Apr 05 16:18:20 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for doppler schematics
Date: 1 Apr 1996 17:35:08 GMT
Message-ID: <4jp44c$[e-mail]>
References: <4jmejr$[e-mail]>

Andreas Junklewitz ([e-mail]) wrote:
: I'm looking for schematics to build a doppler
: unit for 144-146MHz. Was there something in
: the QEX?

: Any hints are appreciated. Thank you very much
: in advance.

May, 1978, QST magazine had an article on the "DoppleScAnt" scanning
Doppler antenna/DF system.  Mine, that I built in 1978, still works fine.
Some of the IC's are starting to get scarce, but substitutions are fairly
easy, I think.

--

Cheers,
Tom
[e-mail]


From [e-mail] Fri Apr 05 16:18:21 1996
From: Eric Jones <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for doppler schematics
Date: Tue, 02 Apr 1996 06:59:55 -0500
Message-ID: <[e-mail]>
References: <4jmejr$[e-mail]>

Andreas Junklewitz wrote:
>
> I'm looking for schematics to build a doppler
> unit for 144-146MHz. Was there something in
> the QEX?
>
> Any hints are appreciated. Thank you very much
> in advance.
>
> Bye,
>         Andreas
> There is a book I just got from Tab books called Radio Direction
finding and (something else, cant quite remember) made easy. Call Tab
books and you can get it for about 20 bucks. I know they have it becouse
I just got it about 2 weeks ago and had to special order it myself.
It's a very good book and has scematics on all kinds of stuff related to
RDF.  I myself just finished a Dopplar unit I use in my car and have
vary good results with it.  It is a Dick Smith clone but not the
original.

73 and happy hunting  :)  Eric KE4KIKAndreas Junklewitz wrote:
>



From [e-mail] Fri Apr 05 16:18:22 1996
From: [e-mail] (Ed Gallup)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for doppler schematics
Date: Thu, 04 Apr 96 21:06:27 GMT
Message-ID: <4k1dh0$[e-mail]>
References: <4jmejr$[e-mail]> <[e-mail]>

In article <[e-mail]>,
   Eric Jones <[e-mail]> wrote:
>Andreas Junklewitz wrote:
>>
>> I'm looking for schematics to build a doppler
>> unit for 144-146MHz. Was there something in
>> the QEX?

> There is a book I just got from Tab books called Radio Direction
>finding and (something else, cant quite remember) made easy. Call Tab
>books and you can get it for about 20 bucks.


      The book you want is:   TRANSMITTER HUNTING  (Radio Direction Finding
Simplified),   by Joseph D. Moell, K0OV  and Thomas N. Curlee, WB6UZZ.
Published by TAB.

  Ed  WB6SAT  [e-mail]



From [e-mail] Fri Apr 05 16:18:23 1996
From: [e-mail] (William Buck)
Newsgroups: rec.radio.amateur.homebrew
Subject: Morse Code Decoder
Date: 2 Apr 1996 19:14:37 GMT
Distribution: world
Message-ID: <4jruat$[e-mail]>

Can anyone tell me where I might buy a Morse Code Decoder? I'm willing to
pay between $100 & $500 for a decder. Also, A kit would be o.k. if it
comes with ready made PC Boards. Bill buck



From [e-mail] Fri Apr 05 16:18:24 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Tom  Zoch)
Subject: NE602 parts in stock at Arrow Elect.
Message-ID: <[e-mail]>
Reply-To: [e-mail]
Date: Tue, 2 Apr 1996 01:12:05 GMT

I was having trouble finding the NE602AD and had read a number of posts
by outhers also unable to find this part. I found out today that Arrow
Electronics @ 1-800-833-3557 has about a 150 of them in stock as of this
afternoon and wanted to pass this info. on to anyone else looking for
them.  All other sources I had tried were backordered.
73,
KC7PMQ




From [e-mail] Fri Apr 05 16:18:25 1996
From: [e-mail] (Ranson J. Pelt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Data for VPO-300L
Date: Wed, 03 Apr 1996 15:38:22 -0500
Message-ID: <[e-mail]>

Help!  Can someone who has an old FET data book give me the charcteristics
for a VPO-300L FET.  This is an old device which I need a substitute for.

Any help would be greatly appreciated.

Tnx...73

--
Ranson J. Pelt

[e-mail]
QST de nz4i


From [e-mail] Fri Apr 05 16:18:25 1996
From: [e-mail] (John Stroppel)
Newsgroups: rec.radio.amateur.homebrew
Subject: need schematic for HW-99
Date: 3 Apr 1996 13:58:36 GMT
Distribution: world
Message-ID: <4ju06c$[e-mail]>

Can any one out there help?  Thanks   John WA0VYZ


--
 John Stroppel                         | Internet: [e-mail]
 The University of Iowa - Hygienic Lab | Amateur Radio: WA0VYZ
 Oakdale Research Campus, OH-M7A       | Voice:    [phone]
 Iowa City, IA   52242                 | Fax:      [phone]


From [e-mail] Fri Apr 05 16:18:26 1996
From: [e-mail] (Parf)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB plated thru holes
Date: 1 Apr 1996 23:57:14 -0500
Message-ID: <4jqc3a$[e-mail]>
References: <4jfhlc$[e-mail]>
Reply-To: [e-mail] (Parf)

Hi Ken,

Don't have an address right off but typically plated thru holes are
'simulated' w/ small rivets. The Motorola handbook for RF Devices makes
mention of these- Perhaps the ARRL handbook or the microwave compendiums
may mention them.

73,  Dale WA2YPY


From [e-mail] Fri Apr 05 16:18:27 1996
From: "miker in Tigard, OR." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB plated thru holes
Date: 1 Apr 1996 21:45:34 GMT
Message-ID: <4jpipu$[e-mail]>
References: <4jfhlc$[e-mail]> <4jmcn7$[e-mail]>

I've seen advertised a gizmo that looks like a tool for punching phone patch b
locks.  you fill it with
eyelet things and ram them into the board.  It autofeeds the eyelets and looks
 like it would be fast.
Check out DigiKey and similar catalogs.  Let me know if you find it.  I'd like
 one too.
miker



From [e-mail] Fri Apr 05 16:18:28 1996
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB plated thru holes
Date: Wed, 03 Apr 1996 16:04:25 GMT
Message-ID: <4ju7od$[e-mail]>
References: <4jfhlc$[e-mail]> <4jmcn7$[e-mail]>

Ed Hare <[e-mail]> shared the following priceless pearls of
wisdom:

>Ken Burtchaell <[e-mail]> wrote:

>>I am looking for a method to simulate plated thru holes in thin(.010
>>duroid).This is for small quanity work,one of a kind boards for amateur
>>microwave projects.

There is an outfit in Santa Barbara CA (and it has only been thirty
years since I bought my last batch of 10,000 from them, so their name
escapes me for the moment -- "Electronic Rivets", "Electronic
Eyelets", or something like that) that make little teeny tiny soft
hollow copper rivets that come in all lengths from 0.010 to 0.250.
They are VERY thin (0.002 or 0.005) so you simply insert them into a
hole drilled .005 or .010 oversize and then splay them with an icepick
or something like that.  If it is a component hole, you solder the
component into one side and it will suck up and solder the other side.
If it is a via, you solder them directly.

I really hope somebody will come on and tell you the name of the
outfit.  I've used my supply for YEARS now.

Jim


Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1/C phone--Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-----A&P Mechanic



From [e-mail] Fri Apr 05 16:18:29 1996
From: Ken Burtchaell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB plated thru holes
Date: 4 Apr 1996 03:16:29 GMT
Message-ID: <4jveud$[e-mail]>
References: <4jfhlc$[e-mail]> <4jmcn7$[e-mail]> <4ju7od$[e-mail]>

Jim The outfit you are trying to remember is International Rivet! Ken



From [e-mail] Fri Apr 05 16:18:30 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: QEX
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]>
Date: Thu, 4 Apr 1996 17:58:20 GMT

In article <[e-mail]> [e-mail] writes:
>
>For my part, Jon and his group do a fine job of putting out a quality
>magazine.  The biggest problem for me is the withdrawal from not
>getting QEX.  I intend to be patient and not bother them too much
>while they continue to dig themselves out of this hole.

Yeah, you bet. And they seem to be taking some of our gripes to
heart too. The latest issue has *source code* listings. Wheeee!
I've gotta have one of those dual synthesizers!

Gary

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


From [e-mail] Fri Apr 05 16:18:31 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:QEX
Date: 4 Apr 96 14:30:51 GMT
Message-ID: <[e-mail]>

Someone asked again about QEX.  I got my January issue earlier this
week, too.  It reminded me that I didn't know when my subscription
expires.

I e-mailed to circulation and got a *very* prompt reply from Kathy C.
She said that, yes, they are still a little behind on getting the
magazine out.

The way I figure it, they are 3 months behind and they have been since
about October.  HOWEVER, I have been receiving a new issue about once
a month since November or December (I forget).  This means they need
to cut about a week off the turn around time to start to get caught
up.

Again, my guess is that this is basically Jon, the editor, and one or
2 other people putting together QEX for us.  It doesn't take much,
like the editor being *really* sick or some such to really mess wtih
the schedule.

For my part, Jon and his group do a fine job of putting out a quality
magazine.  The biggest problem for me is the withdrawal from not
getting QEX.  I intend to be patient and not bother them too much
while they continue to dig themselves out of this hole.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Fri Apr 05 16:18:32 1996
From: [e-mail] (KN5S)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QEX Delivery Problems
Date: 3 Apr 1996 14:11:51 -0500
Message-ID: <4juihn$[e-mail]>
References: <4jrrm2$[e-mail]>

I'm just guessing, but I don't think it's so much a delivery,
as a publication, problem.  Our copies are probably mailed
out immediately upon publication.  It reminds me of some iron
curtain math journals some years ago. They would publish only
as material, press time, and paper became available.  LIke in
this morning's mail I would get an issue with a "publication date"
of  "July 1994".

Let's be patient.  Circulation might just handle things like billing.
You'll probably get a friendly reply if you write or call Lori Weinberg.




73,  Mark  KN5S     [Mark  Mandelkern,  Las Cruces,  NM]


From [e-mail] Fri Apr 05 16:18:33 1996
From: [e-mail] (Malcolm J. Kudra)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio Telemetry Module?
Date: Tue, 02 Apr 96 22:56:01 GMT
Message-ID: <4jsba1$[e-mail]>

We are searching for a module or small board to provide real-time telemtry
transmissions from high-powered model rockets.

This unit would need to be:

a) Licensed or legitimately usable unlicensed in several countries,
b) Interfaceable to an altimeter/accelerometer CPU,
c) capable of transmissions to a range of 50K feet.

Any leads will be greatly appreciated.

BTW, we are not 'radio-knowledgeable' people, so if there is a more suitable
newsgroup to target, please let us know.

Thanks,
Malcolm


From [e-mail] Fri Apr 05 16:18:35 1996
From: Phil Keller <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: Re: Shortwave etc database program....
Date: Tue, 02 Apr 1996 16:33:50 -0800
Message-ID: <[e-mail]>
References: <[e-mail]>

And the Cost is ????

-Phil-

Charles Bolland wrote:
>
> Sir,
>
> A stand alone IBM compatible Broadcasting Radio Station Database
> program for Longwave, Mediumwave, or Shortwave.  4000 records...
> Completely read/write and updateable...
>
> If you'd like a copy, send your EMail address and Postal Address
> which will be used to pass you more detailed information on
> the full featured program....
>
> The above program will be sent via EMAIL...
>
> All information will be kept confidential....
>
> Chuck
>
> KA4PRF

--
====================================
"Those who avoid decapitation,
              leave more offspring."
    -Carl Sagan-
====================================
Phil Keller                    N6MWC
mailto:[e-mail]


From [e-mail] Fri Apr 05 16:18:36 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting tubes!
Date: 2 Apr 1996 19:30:48 GMT
Message-ID: <4jrv98$[e-mail]>
References: <4jg1om$[e-mail]>

Dino Darling ([e-mail]) wrote:
: What is a good RF tube capable of 100 watts output ...?

I'm surprised nobody (until now) has mentioned the 811A as a
possibility in this power range.  It's capable of a bit more
power than this, but it should run 100 watts out pretty
comfortably.

--
Cheers,
Tom
[e-mail]


From [e-mail] Fri Apr 05 16:18:37 1996
Newsgroups: rec.radio.amateur.homebrew
From: Tom Skelton <[e-mail]>
Subject: Re: Transmitting tubes!
Message-ID: <[e-mail]>
Reply-To: [e-mail] (skeltt)
References: <4jls3c$[e-mail]>
Date: Mon, 1 Apr 1996 17:47:05 GMT


>==========William W Janssen, 3/31/96==========
>
>[e-mail] (Nan Gwa) wrote:
>>In article <4jlao4$[e-mail]>, Wayne Glover
><[e-mail]>
>>writes:
>>
>>>Subject:     Re: Transmitting tubes!
>>>From:     Wayne Glover <[e-mail]>
>>>Date:     31 Mar 1996 07:03:31 GMT
>>>
>>>>>
>>>>>I think Yaesu used the 6146 tube.  Is this a good choice?
>>>>>
>>>
>>>Actually the Yaesu FT101B through the FT101E used a pair of
6JS6C sweep
>>>tubes driven by a 12BY7A.
>>>
>>>Not the best transmitter tubes in the world, but the story I
heard was
>>>that in the '50s-'70s rf tubes like the 6146s were not
>available to the
>>>Japanese,(embargos or whatever) so they used whatever they had.
>>>
>>>73s
>>>
>>>Wayne,  KI$XR
>>>
>>>
>>Aside from problems the
>>Japanese may have had, why would anyone have wanted to make a sweep
>>tube amplifier anyway?
>>
>>Tom Donaly KA6RUH
>>
>Sweep tubes can handle larg PEAK currents. Ideal for low duty cycle
>equipment. They were cheep also.
>
>Bill K7NOM
>

It wasn't just the Japanese.  I can't count the number of times
we replaced
the sweep tube finals in a Drake T4XB at the Clemson U club
station.  I think
it also used a pair of 6JS6C's, but I'm probably wrong.  When we
got a Kenwood
TS530S with 6146B's, even with fairly regular contesting, Dx'ing
and general usage,
they kept going and going and going......  Of course, by then
the RTTY enthusiasts
had graduated.  :-)

73, Tom WB4iUX
Clemson U, '76, '82

[e-mail]
or
[e-mail]



From [e-mail] Fri Apr 05 16:18:38 1996
Newsgroups: rec.radio.amateur.homebrew
From: Monty Wilson <[e-mail]>
Subject: Re: Transmitting tubes!
Message-ID: <[e-mail]>
Date: Mon, 1 Apr 1996 19:13:27 GMT
References: <4jlao4$[e-mail]> <4jmdbu$[e-mail]>

[e-mail] (Nan Gwa) wrote:
>My venerable old 1973 ARRL Handbook, in a section entitled "A Sweep
>Tube Linear Amplifier", states, "Because only low-duty-cycle transmission
>is suitable for sweep tubes operated at high power levels, this amplifier
>cannot be used for a-m, fm, or RTTY service."  Aside from problems the
>Japanese may have had, why would anyone have wanted to make a sweep
>tube amplifier anyway?

My dad's Drake TR-3 transceiver uses three sweep tubes in parallel,
and it does use them on AM, but they pulled a trick to keep the
duty cycle down.  They suppressed the carrier and screen-grid-
modulated the tubes so your wattmeter looks like you're talking on
sideband, but when the sidebands are present the carrier is also,
making it possible to copy you on an AM receiver.  Of course, a
REAL AMer would tell you you don't sound too good...

--
.........Monty.
[e-mail]




From [e-mail] Fri Apr 05 16:18:39 1996
From: [e-mail] (Randall Bradley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting tubes!
Date: 1 Apr 1996 14:57:23 GMT
Message-ID: <4joqsj$[e-mail]>
References: <4jlao4$[e-mail]> <4jmdbu$[e-mail]> <4jls3c$[e-mail]>

Bill, K7NOM said sweep tubes were 'cheep', I beg to differ:

        Sweep tubes were cheAp,
        while birds, birdies go cheEp.

                Minor points to be sure, but the speeling on the
                net culd be bedder.

                        _-_randy_-_


From [e-mail] Fri Apr 05 16:18:40 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (David S.A. Stine)
Subject: Re: Transmitting tubes!
Message-ID: <[e-mail]>
References: <4jlao4$[e-mail]> <4jmdbu$[e-mail]>
Date: Wed, 3 Apr 1996 21:03:50 GMT

In article <4jmdbu$[e-mail]>, Nan Gwa <[e-mail]> wrote:
>My venerable old 1973 ARRL Handbook, in a section entitled "A Sweep
>Tube Linear Amplifier", states, "Because only low-duty-cycle transmission
>is suitable for sweep tubes operated at high power levels, this amplifier
>cannot be used for a-m, fm, or RTTY service."  Aside from problems the
>Japanese may have had, why would anyone have wanted to make a sweep
>tube amplifier anyway?
>
>Tom Donaly KA6RUH

Because TV sweep tubes have humongous cathode emission levels -- ie, even
tho the plate dissapation might be only 25 watts in ICAS, the tube's
cathode might well be able to supply enough current to allow for peak power
levels of well over 100W per tube.

As a result, if you were producing a final which was going to be used in a
[relatively] compact unit, you could get your power density waaaay up
there, compared to how much space it would have taken you if you were using
"real" tubes for the job.

Look at the Swan line of transceivers -- they used sweep tubes and were
very popular for mobile SSB work in the late 70's and early 80's.

So what if the key-down power level was only 15% of what the SSB rating
was? Were you really going to use it for CW? RTTY? How many people used to
work RTTY when you were using 026's and model 19's? FM? On HF? Nah. AM was
well on its way out the door by the late 70's, so sweep tubes were a pretty
nifty idea on how to get SSB equipment down to a tolerable size for mobile
work.  In that era, SSB was "the thing" in commercial equipment.

Transmitters I've owned (or still own) which use sweep tubes:

- Hammarlund HX-50 (6DQ5) (not exactly a mobile unit)
- Swan 260, 270, 500 (very usable for mobile work, and I used the 260
  for mobile work *very* well during college)

So sweep tubes have their uses. You just have to understand that they're
while they're cheap, small and high-output, they don't forgive key-down
applications.

dsa



From [e-mail] Fri Apr 05 16:18:41 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting tubes!
Date: Thu, 04 Apr 96 08:41:49 GMT
Message-ID: <4k02eg$[e-mail]>
References: <4jg1om$[e-mail]> <4jrv98$[e-mail]>

   [e-mail] (Tom Bruhns) wrote:

>I'm surprised nobody (until now) has mentioned the 811A as a
>possibility in this power range.  It's capable of a bit more
>power than this, but it should run 100 watts out pretty
>comfortably.

Good idea!  I guess the temporary absence of the 811A from the market
still tends to displace it as a choice for transmitters.  I don't
usually think about using it as a grid-driven final, although there's
no reason not to.

At 100 watts out, an 811A would last almost forever.  It's also
cheaper than a pair of 6146B's.

73,
Jack  WB3U


From [e-mail] Fri Apr 05 16:18:43 1996
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Valve amp/masthead amp design
Date: 4 Apr 1996 17:52:40 GMT
Message-ID: <4k1298$[e-mail]>
References: <[e-mail]>

>I was hoping to use 250's as they are common. But if you say, "Hey, use
>this tube, its cheaper than a pair of 250's, and easier to build around"
>then I'm listening :-)

There is a guy here Karl Wiener, who designs amplifiers around some russian
tubes and he says that they are sturdy and cheap.

>I'd also be grateful for specific articles that describe fully (fit part
>a to part b..) the building of suitable amp/amps.

Get the VHF-DX book by Ian G3SEK, it will tell you a lot about assembling
a good station. Also DUBUS publishes technical notes (Rainer DJ9BV).

>It occurs to me that he might be slid in between 2 coax relays, and poked
>on top of my mast, to make a masthead for 50,144 AND 432 in one box.

Such a thing would completely overload from broadcast and TV.

>You reckon mast head described, if works, be any
>good for EME ??

You would soon learn to appreciate a state-of-the art no-compromize
preamp.

There are a few mailing lists related to VHF and EME, where knowledgeble
people ca be found.

73, Moritz DL5UH


From [e-mail] Fri Apr 05 16:18:44 1996
From: Roger L Traylor <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted Siliconix SD5000 for experimenting
Date: 2 Apr 1996 06:14:41 GMT
Message-ID: <4jqgkh$[e-mail]>

Does anyone know of a source willing to sell SD5000's in small (2-3)
quantity?  I want to try one in a high level mixer.

Thanks,

Roger Traylor WB4TPW


From [e-mail] Fri Apr 05 16:18:45 1996
From: [e-mail] (wayne burdick)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: WTB:  Ten-Tec Argonaut, any species, <= $250
Date: Tue, 02 Apr 1996 11:22:27 -0800
Message-ID: <[e-mail]>

It must be in excellent working order, and rediculously low prices would
be appreciated.  ( I have a couple of friends who know these rigs inside
out who will give me advice on whether the price is right--or better.)
Please include a microphone and power supply if the total price will still
be <= $250.

I'm trying to help out a retired (fixed-income) ham in San Francisco who
really needs a rig.  Thanks in advance for parting with your little-used
gem!


73,
Wayne
N6KR

415-494-3806


From [e-mail] Fri Apr 05 16:18:45 1996
From: Norm Hammar <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: #12 fuse lamp for Drake TR-4 transceiver
Date: Thu, 04 Apr 1996 07:51:01 -0500
Message-ID: <[e-mail]>

Please email [e-mail] or [e-mail]


From [e-mail] Fri Apr 05 16:18:46 1996
From: [e-mail] (Derek Cohn)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: 0 - 140 to 170 pf Variable Capacitors
Date: 1 Apr 1996 04:41:02 GMT
Message-ID: <4jnmou$[e-mail]>

Dear Fellow Swappers,

My antique radio club is trying to homebrew a regenerative receiver project an
d
we are having trouble finding 0 - 140 pf variable capacitors.  We need
approximately 20 of them.  The capacitance is not critical and we can use
anything up to 0 - 175pf.  Does any body have any of these available?  If not,

can you recommend a parts house that has these?

73,

Derek Cohn
WB0TUA




From [e-mail] Tue Apr 09 17:51:53 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna,rec.antiques.radio+phono
Subject: ! Attention Software Authors !
Date: Tue, 09 Apr 96 16:12:25 PDT
Message-ID: <NEWTNews.829091616.3336.amsoft@amsoft>


ATTENTION AUTHORS OF AMATEUR RADIO, SWL, AND ELECTRONIC SOFTWARE!

If your software is shareware, freeware or public domain, AmSoft
would like to include your software in our publication of The
World of Ham Radio CD-ROM.  If you only have a commercial version
you may want to think about a shareware version with registration.
Most authors have had good returns on registrations from the first
year of publishing thier software on this CD-ROM.  If 50 users
registered your program from our CD-ROM publication, what would that
convert to in income for you?  Please give this some thought and let
us here at AmSoft know if you would like to publish your works on
the AmSoft CD-ROM.  If you decide to publish on our CD please
upload your software to our FTP site and send me an E-Mail letter of
authorization to publish your software on the AmSoft CD-ROM.

NOTE: DEADLINE FOR NEXT CD-ROM IS APRIL 29, 1996

The FTP site is HAMSTER.BUSINESS.UWO.CA directory /PUB/AMSOFT






From [e-mail] Tue Apr 09 17:51:54 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: 6146 tubes
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4jgila$[e-mail]> <4k49op$[e-mail]>
Date: Sat, 6 Apr 1996 18:15:36 GMT

In article <4k49op$[e-mail]> [e-mail] writes:
>[e-mail] wrote:
>>Does  anybody know what the differences are between a 6146B and a 6146W tran
smitting tube?
>
>>      Bob  W1FYO
>
>"W" is _supposedly_ the ruggedized military version.
>
>Uncle Brian VK6BQN

Yeah, but that refers to *physical* ruggedness, not increased
electrical ruggedness. In the latter regard, it is no different
from a 6146A. The 6146B has 10 more watts of plate dissipation.

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


From [e-mail] Tue Apr 09 17:51:55 1996
From: [e-mail] (Eric M. Brombaugh)
Newsgroups: rec.radio.amateur.homebrew
Subject: 6m XCVR project
Date: Thu, 04 Apr 1996 20:43:49 -0700
Message-ID: <[e-mail]>

Hello,

I've recently become interested in 6m operation, and have started a small
project to build a 6m FM Transceiver.  I'm basing the whole thing on a
bunch of Motorola parts which were originally intended for cordless phones.

I started with the reciever, based on an MC3362 Dual Conversion FM reciever.
It looks pretty good on paper, and overall it works pretty well.  I use an
MC145162 PLL chip to lock the first LO, and the 10.245 2nd LO as the input
to the reference divider.

As it stands right now, the thing has a sensitivity of about -100 dBm.  This
is about 20 dB off of what it should be able to do, and I think I know why:
Looking at the 1st LO on a spectrum analyzer, it is REALLY messy.  I have
tried all the common solutions to phase noise in PLLs - wider loop bandwidth,
regulation of the Phase Detector and VCO supplies, boosting the VCO output
levels into the feedback divider, but no improvments yet.

So, anyone have any ideas on other things to do to clean up that LO?

Advice appreciated.

--
Eric Brombaugh     KC7GXA
[e-mail] (private)
[e-mail]   (work)


From [e-mail] Tue Apr 09 17:51:56 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] ("Stephen Walters")
Subject: Re: 6m XCVR project
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Sun, 7 Apr 1996 15:48:38 GMT

FT1000mp+Transverter
Kenwood 870+Transverter
IcomDSP 775+Transverter
Kenwood 470 (New, midi sized dsp rig)+Transverter
Kenwood ts950dx or 850dx? + Transverter
Kenwood TS 690 HF+6m
Yaesu FT736 with 6m module
Icom 706
Yaesu Ft690R2 Mono band 6m The only portable of the bunch
NRD JST125 (Have not tried but ment to be very good, liked in QST last
year.


regards

Steve G7VFY

PS I have a FT736 and a FT690r2 (Great for back packing with motorcycle
battery, small linear and maybe a solar panel.)







From [e-mail] Tue Apr 09 17:51:57 1996
From: Brad Adams <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 6MJ6 Sweep Tubes
Date: Fri, 05 Apr 1996 18:20:21 -0800
Message-ID: <[e-mail]>

Does anyone know of a good source for 6MJ6 sweep tubes? I have an AMP
SUPPLY LA1000 that I would like to have some spare tubes for.

Leave email for [e-mail] or here on this newsgroup.

73... Brad N4PYI




From [e-mail] Tue Apr 09 17:51:57 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (J Gerwitz)
Subject: 70 cm Transverter recommendations needed
Date: Thu, 04 Apr 96 13:10:14 GMT
Message-ID: <[e-mail]>
Keywords: Transverter, YEASU, 70 cm

I have a Yaesu FTV-107 dual transverter box which contains only the 2 M
module.  I would like to add the 70 cm band module but have been unable to
find anyone willing to part with theirs.  As a result I am considering
building my own module using commercial modules, PCBs, or whatever that
already exist and substitute my own module in place of the YASEU module.

Can anyone give me some recommendations on modules, PCB's etc that use the
standard 28 mhz as the local osc and switchable IF?

You can email me at [e-mail].

Thanks

Jim


From [e-mail] Tue Apr 09 17:51:59 1996
From: [e-mail] (John 015)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: [Q] Pulling a crystall up 1000ppm. Doable
Date: Sat, 6 Apr 1996 22:11:59 EST
Message-ID: <4k7c26$[e-mail]>
References: <4k4ret$[e-mail]> <[e-mail]>

In article <[e-mail]>, Rocci <[e-mail]> said:

>> I have a 22 MHz crystall and I want to pull it up in frequency.
>> Ideally 1000ppm (0.1%) but barring that I want get as close as
>> possible to this higher value.  The stability of the oscillator
>> is not important.
>>
>
>Forget about doing anything which materially affects the series
>resonant frequency of the crystal. No can do!
>If the 22 MHz frrequency is truly the crystal's SERIES resonant
>frequency, then you can probably hit the higher frequency by operating
>the crystal in a circuit which runs at  PARALLEL resonance.
>
>Get a CMOS inverter, like the 74HCU04 (should be an unbuffered part,
>hence the "U"). Put a 100K (not critical at all) resistor from output to
>input of one of the inverters. This will bias the output to 1/2 Vcc. Put
>the crystal from output to input. Put a 33Pf cap from input to ground,
>and another from output to ground. The circuit should oscillate at the
>crystal's parallel resonant frequency. Adjust the capacitor at the input
>of the inverter to "pull" the oscillation frequency.
>
Hmm,  my optimism is fadin.. :-).   I'll try this though
and see what happens.

Thanks,
John


From [e-mail] Tue Apr 09 17:51:59 1996
From: [e-mail] (John 015)
Newsgroups: rec.radio.amateur.homebrew
Subject: [Q] Pulling a crystall up 1000ppm. Doable ?
Date: Fri, 5 Apr 1996 23:16:23 EST
Message-ID: <4k4ret$[e-mail]>

Hi,


I have a 22 MHz crystall and I want to pull it up in frequency.
Ideally 1000ppm (0.1%) but barring that I want get as close as
possible to this higher value.  The stability of the oscillator
is not important.

I'm assuming it's a series resonant crystall and I'm
speculating that if I put a capacitor in series with the
crystall it's resonant frequency will increase.

I wonder if I'm on the right track and I'm fishing for a
ballpark value on the capacitor I have to insert.

Thanks,
John


From [e-mail] Tue Apr 09 17:52:00 1996
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Alinco DX-70 -- better i-f filtering?
Date: 4 Apr 1996 13:15:12 GMT
Message-ID: <4k0i10$[e-mail]>
References: <4jr8tm$[e-mail]>

>I tried
>to work some of the WPX contest this past weekend while I
>was out motoring around over the weekend, and it was really
>a lost cause.

Are you sure it is the IF selectivity and not input overloading?
The best advice is to sell it while it is still under garantee
and get a decent radio.

73, Moritz DL5UH



From [e-mail] Tue Apr 09 17:52:01 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] ("Stephen Walters")
Subject: Re: Best DSP Outboard Radio ?
Message-ID: <[e-mail]>
References: <4k3oce$[e-mail]>
Date: Sun, 7 Apr 1996 15:48:40 GMT

Wait until the Kenwood TS-470, the new midi-sized hf box with DSP.


From [e-mail] Tue Apr 09 17:52:03 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (David Feldman)
Subject: Controlled Carrier AM (was Re: Transmitting tubes!)
Message-ID: <[e-mail]>
References: <4jlao4$[e-mail]> <4jmdbu$[e-mail]> <[e-mail]>
Date: Mon, 1 Apr 1996 20:26:35 GMT

In article <[e-mail]> Monty Wilson <mwilson@bangat
e.compaq.com> writes:
>[e-mail] (Nan Gwa) wrote:
>>My venerable old 1973 ARRL Handbook, in a section entitled "A Sweep

>My dad's Drake TR-3 transceiver uses three sweep tubes in parallel,
>and it does use them on AM, but they pulled a trick to keep the
>duty cycle down.  They suppressed the carrier and screen-grid-
>modulated the tubes so your wattmeter looks like you're talking on
>sideband, but when the sidebands are present the carrier is also,
>making it possible to copy you on an AM receiver.  Of course, a
>REAL AMer would tell you you don't sound too good...

Drake calls this "controlled carrier AM". I think what's really happening
is that the carrier level into the finals tracks the modulation envelope,
so when the signal is only lightly modulated (i.e., less power into the
sidebands), the carrier level is reduced accordingly, so that the carrier-
to-peak-modulation-power level is held more in line. It definately gives
you lower average plate dissipation (unless you're also using audio
compression) and it is still audiable on a regular AM receiver (altho the
RF-derived "S" meter on an old style AM receiver will now move at a syllabic
rate, rather than hold steady). It's kind of an interesting scheme and the
only drawback I can see is that the receiving end might perceive a lower
signal/noise ratio during periods of low modulation.

No other HF transceiver (even modern solid state ones) seem to work this way.

73 Dave WB0GAZ [e-mail]



From [e-mail] Tue Apr 09 17:52:04 1996
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Diff between Tx and Rx Crystals?
Date: Sun, 7 Apr 1996 10:39:16 LOCAL
Message-ID: <[e-mail]>
References: <[e-mail]>

In article <[e-mail]> [e-mail] (SARUMAN) writ
es:
>From: [e-mail] (SARUMAN)
>Subject: Diff between Tx and Rx Crystals?
>Date: Sun, 7 Apr 1996 16:10:38 GMT

>Ok this may be an incredibly dopey question but what if any are the physical
>differences between Transmit and Receive Crystals? IOW can a TX Crystal be
>used to Receive and Can a Receive Crystal Transmit? If no why?
>Thanx folks.....Electronics novice am I.

There is no fundamental (no pun intended) difference. Radios that use one
crystal for transmit and another for receive need the two different
frequencies to compensate for the intermediate frequency offset. In
otherwords, if the i-f is 10.7MHz, then the receive crystal will be either
10.7MHz above or below the transmit crystal frequency.

HTH,
73, Wes N7WS


From [e-mail] Tue Apr 09 17:52:06 1996
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Diff between Tx and Rx Crystals?
Date: Mon, 08 Apr 1996 19:38:21 GMT
Message-ID: <4kbtj9$[e-mail]>
References: <[e-mail]>

[e-mail] (SARUMAN) wrote:

>Ok this may be an incredibly dopey question but what if any are the physical
>differences between Transmit and Receive Crystals? IOW can a TX Crystal be
>used to Receive and Can a Receive Crystal Transmit? If no why?
>Thanx folks.....Electronics novice am I.

Not so dopey at all.  Transmit crystals operate on the frequency that
eventually gets out of the antenna, or some submultiple of that
frequency.  For example, a 17.5 Mhz crystal can generate RF at 17.5
Mhz, or you can triple the frequency to 52.5Mhz to operate on 6
meters.  (You can double it, or multiply it by some other integral
value as well.)

Receive crystals do NOT work on the transmit frequency.  They are
offset by a certain frequency to facilitate mixing with the incoming
receive signal from the antenna, and conversion down to an
intermediate frequency for amplification and eventually detection.  In
most VHF FM work, the receive crystal is offset from the transmit
frequency by 10.7 Mhz.  When you mix that offset crystal frequency
with incoming signals, you get (along with some other combinations) a
difference frequency of 10.7 Mhz.  This frequency is passed through a
narrow bandwidth filter that passes 10.7 Mhz signals and blocks all
others.  On the output of that filter you have your desired receiver
signal, and nothing else.  (All of this is an ideal case, of course;
there's always "slop" in systems like this.)

An example: My 6M receiver uses a receive crystal with a frequency of
41.825.  (52.525 - 10.7.)  In the first mixer, this 41.825 Mhz
frequency is mixed with incoming signals from the antenna, with the
result that the signals coming in at 52.525 (the 6M calling frequency)
appear at the output of the mixer at 10.7 Mhz.  This 10.7 Mhz mixer
output is then filtered, processed further,  and detected, allowing me
to receive on 52.525 Mhz.

So receive and transmit crystals do not operate on the same
frequencies and are thus NOT interchangeable.  A transmit crystal may
be used in a receiver in some cases, but it will NOT receive the
frequency stamped on it, but at some offset from that frequency,
probably 10.7 Mhz up or down.  (Other offsets in common use are 455
Khz and 262 Khz, but generally not in crystal-controlled receivers.)

Hope this helps some.  Best way to understand this stuff is to build
some of it yourself!

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona



From [e-mail] Tue Apr 09 17:52:07 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Diff between Tx and Rx Crystals?
Date: 8 Apr 1996 18:27:14 GMT
Message-ID: <4kblq2$[e-mail]>
References: <[e-mail]>

Gary Coffman ([e-mail]) wrote:
: The former is the gotcha, make sure that you know the
: frequency on which the crystal actually oscillates. It may not be the
: frequency stamped on the case with crystals intended to be used in
: receivers.

Of course, the same is true of crystals stamped with the transmitter
frequency:  the crystal likely will oscillate on a fraction (like 1/9 or
1/12) of the actual transmitter output frequency; in some cases there is
even an IF offset on transmit as well as on receive (e.g., a
crystal-controlled HF SSB transmitter).  (Though in that case, the rig
would likely use one crystal for both receive and transmit.)  And to
further complicate things, often both the receive and transmit crystals
will be stamped with a "channel number" instead of an actual frequency.
It's not only the CB band that's channelized.

If you are lucky, the crystal may be stamped with _both_ the frequency of
oscillation and the radio input/output frequency.

--
Cheers,
Tom
[e-mail]


From [e-mail] Tue Apr 09 17:52:08 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Re: Diff between Tx and Rx Crystals?
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Mon, 8 Apr 1996 22:22:12 GMT

Thanx for the info on Crystals

<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Tue Apr 09 17:52:09 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Re: Diff between Tx and Rx Crystals?
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Mon, 8 Apr 1996 22:22:22 GMT

>In article  [e-mail] (SARUMAN) writes:
>>Ok this may be an incredibly dopey question but what if any are the physical
>>differences between Transmit and Receive Crystals? IOW can a TX Crystal be
>>used to Receive and Can a Receive Crystal Transmit? If no why?

>Sure, with some caveats. A crystal is a crystal, and is just a source
>of a stable frequency (when used in a proper oscillator circuit). The
>caveats are that the frequency *stamped* on the receive crystal may
>include the IF offset of the intended receiver, IE 10.7 MHz above or
>below the actual frequency of oscillation of the crystal as one example,
>and that receive crystals in general can't handle as much RF current as
>some transmit crystals. This latter is of vanishing importance since most
>transmitters today don't require much crystal current either, but some did
>in the old days. The former is the gotcha, make sure that you know the
>frequency on which the crystal actually oscillates. It may not be the
>frequency stamped on the case with crystals intended to be used in
>receivers.

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

<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Tue Apr 09 17:52:10 1996
From: [e-mail] (mkeitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct-modulated AM with solid state final?
Date: 5 Apr 1996 18:17:17 GMT
Message-ID: <4k3o3d$[e-mail]>
References: <[e-mail]> <4k1g6e$[e-mail]> <4k30es$[e-mail]>

In article <4k30es$[e-mail]>, [e-mail] (Dana Myers) sa
ys:
>
>In article <4k1g6e$[e-mail]>,
>WB3U <[e-mail]> wrote:
>>Post / CC by Mail
>>
>>   Monty Wilson <[e-mail]> wrote:
>>
>>>What I want to know is: has anyone managed to take a late-
>>>model solid state transceiver (like mine) and modify it to
>>>run collector- modulated AM?  Other than finding or winding
>>>a modulation transformer, it would seem relatively simple
>>>to modify a solid-state rig like this, and you could run
>>>a 40W carrier, which on 10m would be plenty.
>>
>>Check the price of replacement finals before you try this.  The peak
>>Vcc that results from collector modulation may exceed their ratings.
>
>If you *really* want to use an FT-747 like this, I'd suggest using the
>radio as a low level exciter to feed a class-C amplifier chain with
>high level modulation.  For the FT-747, you can get a low level output
>from the main PCB where the PA coax normally plugs in, and run the
>radio in split mode, CW on transmit / AM on receive.

The sound quality from a low-level modulated transmitter should be the
same as that from a high-level modulated one, the only difference is that
the power amplifier is not as efficient.  Maybe there are harsh audio
filters/processors intended for SSB use still in the audio path.  Or
maybe the problem is that you are telling the hard-core AMers that you
are using a modern radio, and they just expect it to sound bad.

Direct modulation could be done by disconnecting the collector supply
to the finals and connecting it to a source of high-power audio, such
as a voltage follower.  I wouldn't use a choke or transformer as that
may allow the voltage to go too high or swing negative, which is likely
to damage the finals.  If the peak modulated voltage is 13.8V, there'll
be no undue stress on the finals, but you'll still get 100 W PEP (25 W
carrier).  If you want/need more power, an external amplifier is the only
way to get it safely.

Strange things may happen during the negative peaks when the bases of
the finals still have high RF drive applied, but no collector voltage. I
don't know if this has the potential to cause damage or not.

-Mike KD4QDM


From [e-mail] Tue Apr 09 17:52:11 1996
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct-modulated AM with solid state final?
Date: 5 Apr 1996 11:33:48 GMT
Message-ID: <4k30es$[e-mail]>
References: <[e-mail]> <4k1g6e$[e-mail]>

In article <4k1g6e$[e-mail]>,
WB3U <[e-mail]> wrote:
>Post / CC by Mail
>
>   Monty Wilson <[e-mail]> wrote:
>
>>What I want to know is: has anyone managed to take a late-
>>model solid state transceiver (like mine) and modify it to
>>run collector- modulated AM?  Other than finding or winding
>>a modulation transformer, it would seem relatively simple
>>to modify a solid-state rig like this, and you could run
>>a 40W carrier, which on 10m would be plenty.
>
>Check the price of replacement finals before you try this.  The peak
>Vcc that results from collector modulation may exceed their ratings.

If you *really* want to use an FT-747 like this, I'd suggest using the
radio as a low level exciter to feed a class-C amplifier chain with
high level modulation.  For the FT-747, you can get a low level output
from the main PCB where the PA coax normally plugs in, and run the
radio in split mode, CW on transmit / AM on receive.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are mine and should *
 * [phone]               | not be interpreted or represented as     *
 * [e-mail]      | those of Sun Microsystems, Inc.          *



From [e-mail] Tue Apr 09 17:52:12 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Direct-modulated AM with solid state final?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4k3o3d$[e-mail]> <4k3vp6$[e-mail]>
Date: Sat, 6 Apr 1996 18:12:31 GMT

In article <4k3vp6$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>When collector modulating a solid state amplifier, the following
>conditions must be met:
>
>1.) The driver must also be modulated. This is because driver power
>"leaks" directly through the PA to the output. Unless the drive power is
>also modulated the correct amount, you won't be able to get more than 80
>or 90 percent modulation.

I thought that only PAs that were operating common base were subject
to this limitation.

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


From [e-mail] Tue Apr 09 17:52:13 1996
From: Grant Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct-modulated AM with solid state final?
Date: Sat, 06 Apr 1996 23:50:48 -0600
Message-ID: <[e-mail]>
References: <[e-mail]> <4k1g6e$[e-mail]> <4k30es$[e-mail]>

> >   Monty Wilson <[e-mail]> wrote:
> >
> >>What I want to know is: has anyone managed to take a late-
> >>model solid state transceiver (like mine) and modify it to
> >>run collector- modulated AM?  Other than finding or winding
> >>a modulation transformer, it would seem relatively simple
> >>to modify a solid-state rig like this, and you could run
> >>a 40W carrier, which on 10m would be plenty.

Unless you're just into experimenting, I can't imagine why you would want to d
o this at
all.

You can purchase a decent AM transmitter for a few hundred dollars or less, an
d spend
your time restoring it and getting it going.

Or, you can run most modern rigs on AM and still have an excellent signal.  Mo
st sandbox
radios sound bad on AM not because they "just do", but because they are improp
erly
adjusted -- usually too much carrier output (leaving insufficient headroom to
develop
the required PEP at about 4 times the carrier power without distortion in the
finals)
and WAAAAY to much audio drive.  There are many fine sounding legal limit AM s
tations
operating in the AM windows which start life as modern transceivers, properly
adjusted.
And they are indistinguishable from the plate modulated guys (like me).

Grant/NQ5T


From [e-mail] Tue Apr 09 17:52:14 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct-modulated AM with solid state final?
Date: Thu, 04 Apr 96 21:42:38 GMT
Message-ID: <4k1g6e$[e-mail]>
References: <[e-mail]>

Post / CC by Mail

   Monty Wilson <[e-mail]> wrote:

>What I want to know is: has anyone managed to take a late-
>model solid state transceiver (like mine) and modify it to
>run collector- modulated AM?  Other than finding or winding
>a modulation transformer, it would seem relatively simple
>to modify a solid-state rig like this, and you could run
>a 40W carrier, which on 10m would be plenty.

Check the price of replacement finals before you try this.  The peak
Vcc that results from collector modulation may exceed their ratings.

73,
Jack  WB3U


From [e-mail] Tue Apr 09 17:52:15 1996
Newsgroups: rec.radio.amateur.homebrew
From: Monty Wilson <[e-mail]>
Subject: Re: Direct-modulated AM with solid state final? (thanks)
Message-ID: <[e-mail]>
Date: Mon, 8 Apr 1996 18:01:48 GMT
References: <[e-mail]> <[e-mail]>

Many thanks to Gary, Jack, Dana, Mike, Tom, and Grant who have talked
me out of hacking on my radio, and reminded me of some electronics
that I should have remembered all along.  Here's what I've learned:

It is usually improper adjustment, rather than IMD from nonlinearity,
that causes low-level-modulated AM to sound bad.

High-level modulation of a transistor final is much more complicated
than just lifting a leg of a transistor and sticking a transformer
in the circuit.

If I ever want to try this, I'm definitely going to start with a 50W
CB pre-driver and hack on THAT, rather than mess up my main rig.

When ten meters comes back and I want to get on AM again, I'm getting
a peak-reading wattmeter so I can adjust my transmitter properly.

There are still some folks out there knowledgeable enough about AM and
nice enough to lend a hand.

Thanks again and 73

--
.........Monty.
[e-mail]




From [e-mail] Tue Apr 09 17:52:16 1996
From: [e-mail] (Brian)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DTMF Decoder
Date: Sun, 07 Apr 1996 17:13:46 GMT
Message-ID: <4k8t5v$[e-mail]>
References: <[e-mail]>

Patrick Millar <[e-mail]> wrote:

>Hello,

>I am looking for a DTMF decoder chip.  Can anyone recommend a particular
>model?

>Patrick Millar VE3BFC
>[e-mail]


Silicon Systems makes a simple chip  SSI 202 or 203
schematics can be found in 1993  ARRL handbook



From [e-mail] Tue Apr 09 17:52:17 1996
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Error in Motorola RF Databook?
Date: Mon, 08 Apr 1996 18:48:33 GMT
Message-ID: <4kbqlr$[e-mail]>

I know a lot of Motorola guys read this group, and this question is
directed mainly to them.  In my 1983 copy of the Motorola RF Device
Data book, the data sheet for the MRF497 transistor contains a test
circuit and PC board for what would be a whopping good start on a
35-45 watt 6M power amp.  (Page 4-126 of that edition of the book.)

The problem is that the schematic doesn't seem to match the PC board
or the photo of the assembled test fixture.  The photo shows four Arco
trimcaps, but the circuit calls out only three.  The coils seem in the
wrong places on the circuit board vis a vis the schematic, and I've
started to wonder if either the schematic or the test fixture PCB and
photo are wrong for that data sheet.  Does anybody have any clue here?

As RF Parts sells the MRF497 for $19.95, it would be pretty easy to
build the amp, if I knew I could trust both the circuit and the PCB.

Thanks in advance for any help here.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona




From [e-mail] Tue Apr 09 17:52:18 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FREEMEN
Date: 5 Apr 1996 08:30:05 -0500
Message-ID: <4k378t$[e-mail]>
References: <[e-mail]>

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

>
>Will they take a check?
>
>(idiots)
>
>

They will take a check, but not a Czech. They will also take idiots, and
do quite often.


From [e-mail] Tue Apr 09 17:52:19 1996
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FREEMEN
Date: Fri, 05 Apr 1996 21:19:50 -0800
Message-ID: <[e-mail]>
References: <[e-mail]> <4k378t$[e-mail]>

In article <4k378t$[e-mail]>, [e-mail] (W8JI  Tom)
wrote:

> In article <[e-mail]>, Eric Jones
> <[e-mail]> writes:
>
> >
> >Will they take a check?
> >
> >(idiots)
> >
> >
>
> They will take a check, but not a Czech. They will also take idiots, and
> do quite often.

Really, a quite good pun.  I'll bet you can also do that real time...

Recent headline in a local paper: "Pipe bombs tied to Freemen," (We all
Hope so)!


From [e-mail] Tue Apr 09 17:52:19 1996
From: William Leonard <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: misc. 2meter equipment
Date: Wed, 03 Apr 1996 02:40:14 -0600
Message-ID: <[e-mail]>

I am wanting to sell the following equipment:
 HTX-202 2m transceiver 6watt out!.....make an offer

MFJ SWR/power/field strenght meter.....make an offer

Ramsey PA-10 2m power amp.: 6watt in-> 45 watts out!....make an offer

E-mail replies or questions to: [e-mail]

thanks...


From [e-mail] Tue Apr 09 17:52:20 1996
From: jcarey (Joe Carey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: fuses vs. circuit breakers vs. polyswitch
Date: Sun, 07 Apr 96 00:18:25 GMT
Distribution: world
Message-ID: <4k78fq$[e-mail]>
References: <4ik0es$[e-mail]>

Tom Kreyche <[e-mail]> wrote:

>Circuit breakers appear to have a voltage drop of about 1.5 v which
>minimizes useful battery life, so it appears to be a bad option for a
>system which isn't charging continuously.

Look a little bit more.  Bussman makes some very nice, light weight fuses at
low values.  However, they may fail completely if the battery is capable of
supplying too much voltage/current.  This is because there is an internal
resistor used to heat a bi-metal strip which trips when the current
draw becomes too great.   Under extreme faults, this resistor opens up,
just like a fuse!  This also means that the trip point changes with
ambient temperature, which you just might find problematic for sailplanes.

The PolySwitch (tm) has a limited life, slow trip time, and is  sensitive to
ambient temperature.  Note also that the polyswitch opens up by becoming
a high resistance, which gets REALLY hot when it trips.  This means that
the load on the battery doesn't dissappear when the PolySwitch (tm) trips.

PolySwitches (tm) find application especially in places where it is INCREDIBLY
difficult to change a fuse (i.e. a craftsperson might need to climb a telephon
e
pole, you might need to send an instrument back to the factory to get access t
o
the fuse, etc.).


>Any suggestions?

If it was me, I'd use a fuse.  It's lightweight, reliable, and fast.

YMMV.


Joe Carey

[e-mail]
[e-mail]


From [e-mail] Tue Apr 09 17:52:22 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: G2DAF linear amplifier
Date: 3 Apr 1996 12:56:45 -0500
Message-ID: <4jue4t$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail]
(David Stockton) writes:

>   The novelty of the G2DAF design was in using the incoming RF to power
>the screen grid supply. The grounded cathode configuration gives somewhat
>more gain than grounded grid, but the screen supply keeps the drive power
>requirement up. It is difficult to find seniconductor diodes that are
>fast enough to work well in this circuit at the necessary voltage
>ratings. The original used thermionic rectifier valves.

And not only that, the circuit is horribly non-linear! It is probably the
single most IMD prone circuit in history.

The scrren voltage fluctiates wildly with drive, the screen grid loads the
input RF envelope at a non-linear rate with power,  and so on. It ranks
right up there with class C amplifiers for SSB purity!

>   With a 100Watt exciter, I'd suggest the grounded grid for its good
>linearity and freedom from neutralising/decoupling difficulties. Grounded
>grid passes exciter power to the load and so might just be noticably more
>efficient...

I'll vote for that! There is no merit in using grid driven circuits unless
you need the gain. Grid driven circuits are more complex (expensive) and
harder to stabilize. They are also more critical for voltage regulation,
and harder to tune!

Use grounded grid! Does the 813 have the beam forming plates brought out
on a seperate connection? If so, it'll work. If the beam forming plates
are tied to the heater it won't work in grounded grid.

73 Tom


From [e-mail] Tue Apr 09 17:52:23 1996
From: [e-mail] (Frank Ellesmere)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: G2DAF linear amplifier
Date: Sat, 06 Apr 1996 00:39:37 GMT
Message-ID: <4k47dl$[e-mail]>
References: <4jrlme$[e-mail]>

Lennart Nilsson <[e-mail]> wrote:

>I'm building a HF-PA with three 813's in grounded grid but I
>would like to try the G2DAF grid-driven design instead. Has
>anybody compared efficiency and linearity between those circuits?
>- SM5DFF

I think I would forget the 813s and go with a 4CX800A from Svetlana
and swamp the grid with a 50 ohm resistor. Really simple circuit.
Relatively low plate voltage requirement, good gain, neutralization
not required etc. If you can run higher power in SM land than 800
watts of plate dissipation would allow  try the 4CX1600B. These two
tubes are quite inexpensive.

73, Frank, KG0FC/G8CJ, Mankato, Minnesota.



From [e-mail] Tue Apr 09 17:52:24 1996
From: [e-mail] (SandDRal)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.shortwave,rec.radio.swap
Subject: Re: GrandFather left 2 Garages full of Stuff
Date: 1 Apr 1996 20:30:28 -0500
Message-ID: <4jpvvk$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (SandDRal)

Todate the 800 phone number is not working, good luck.


From [e-mail] Tue Apr 09 17:52:25 1996
From: [e-mail] (Pablo Lewin)
Newsgroups: rec.radio.amateur.homebrew
Subject: HAM III/CD44 (CDE) Rotor Problems, help!
Date: Mon, 08 Apr 1996 19:37:13 GMT
Message-ID: <4kbprb$[e-mail]>
Reply-To: [e-mail]

Hi, and thank you for reading this

I have a HAM III/CD44  (CDE) rotor and controller, the rotor works
really well, however the heading indicator stopped working yesterday,
it just won't "track" anymore and the needle is not physically stuck,
I fear that I may have misplaced a wire and I don't have the
schematic/owners manual.        Does anybody out there know how to find out
how the wires are connected ?, any troubleshooting techniques for the
meter?, could anybody send me the text or the GIF of the Schematic (or
both)?, where can I get an old owner's manual?/ book?

Any help appreciated, thanks in advanced

Pablo Lewin
WA6RSV
please reply through e-mail to  [e-mail]



From [e-mail] Tue Apr 09 17:52:26 1996
From: Adriano Sgarbi <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HAM SHOP  - VIRTUAL MARKET
Date: Mon, 08 Apr 1996 11:22:20 +0200
Message-ID: <[e-mail]>

NEW !!

HAM SHOP  virtual market for radio amateur.

NO commercial site !!
only for private announce !!

visit it at :

http://www.datas.it/~arg/


Advanced Radio Group

e-mail : [e-mail]


From [e-mail] Tue Apr 09 17:52:27 1996
From: [e-mail] (KD4GEU)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with older FT-530?
Date: 9 Apr 1996 04:15:31 -0400
Message-ID: <4kd6b3$[e-mail]>
Reply-To: [e-mail] (KD4GEU)

Hello:
     I have an older Yaesu FT-530 that's about 3 years old
and its one that only took the solder pad 13 mod. My question
is that it will only transmit up to about 456.000mHz but at
that freq it flutters at keyup, its quite about 454.000mHz.

     Does anyone have any suggestions to get the unit to
transmit up to 470.000mHz. I did the same mod on a friend's
530 and his will transmit up around 470.000 to my jealously.

     I have permission to use a 460 business band repeater,
and would like to be able to do so with the 530.

     I think the 530 is a excellent radio and hate to see them
discontinue it. Any help with my mod will be appreciated.

                         Thanks for reading this!
                          [e-mail]


From [e-mail] Tue Apr 09 17:52:28 1996
From: [e-mail] (Brian)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help: need altimeter device for ham balloon
Date: Sun, 07 Apr 1996 17:14:44 GMT
Message-ID: <4k8t7p$[e-mail]>



Me and a few of the local hams are putting together an Amateur Balloon

We are in the fist stages of equipment design and I'm the lucky (or is
that unlucky) one who gets to build the instrument package.  For the
first flight we are going to use a Basic Stamp (I or II not sure yet)
to send telemetry and collect data from onboard sensors.

I have completed the temperature sensors and i am looking for a way to
determine the altitude of the balloon (low cost needed)  I have heard
of a few chips or rather modules by motorola that do this.  If anyone
can help we would be most greatful.


Thanks   Brian McClure  ( N8PQI )
email: [e-mail]
phone: [phone]




From [e-mail] Tue Apr 09 17:52:29 1996
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF SSB Selective Call
Date: Fri, 05 Apr 1996 21:21:50 -0800
Message-ID: <[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail] (Gustavo D.
Leizerovich) wrote:

> HF-SSB Selective Call Units.
> Brand new in the box.
> Compatible with any SSB radio.
> Excellent performance in poor S/N environments.
> Ackback and Busy modes of operation.
>
> Price:  $99 each
>
> Gus Leizerovich
> [e-mail]

Can you elucidate?  What/who are they? By whom? When?


From [e-mail] Tue Apr 09 17:52:30 1996
From: Ken Burtchaell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How can I print directly on PCBs?
Date: 5 Apr 1996 12:35:47 GMT
Message-ID: <4k3433$[e-mail]>
References: <4k2b93$m1a$[e-mail]>
To: [e-mail]

Hi Mike: I do a fair amount of onesy twoesy pcb boards.
Most of my boards are very simple because they are one or two stage
microwave amps.
Somewhere in the newsgroups presently there is a lengthy article about
numerous methods that you should read.
I print my artwork on a Okidata laser printer.If you print to ordinary
printer paper you will have difficulty cleaning all the paper off after
ironing on without losing some of the trace.The board should be ultra
clean before ironing,Pre-etching the board surface seems to help.There
are better papers to print on.I have been experimenting with a baking pan
liner paper sold by rolls in grocery stores that works very well.You iron
your print on the board,cool the board and peel the paper right off
cleanly.There is another kind of bakery paper which is a sugar base that
I understand will disolve in water after ironing.I haven't found any to
tyr yet!    73  Ken



From [e-mail] Tue Apr 09 17:52:31 1996
From: Mike Colley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: How can I print directly on PCBs?
Date: 5 Apr 1996 05:32:19 GMT
Message-ID: <4k2b93$m1a$[e-mail]>

Sorry if this is a repeating question, if it is, then flame me by
e-mail, I'm new here.

I want to find a way to use a PC printer to print directly on
printed circuit board raw stock for the purpose of making
quantity 1 or two boards.  Is there a printer not expensive (read
<$600) that can do that?  I don't want to mess with several photo
steps if I can eliminate that.

Maybe a straight paper path printer would work if raw stock was
thin enough.  I have found two printers with almost straight
paper paths, one is a HP ink jet, the other is a Citizen portable
thermal wax transfer.  But I'm not limited to these, I haven't
bought yet.  I have found .007 double sided 1 oz. stock.

I have tried the laser printing to paper then use a hot iron to
transfer ink to PCB from DIGIKEY.  Much of the ink fell off of
the PCB and the heat from the iron oxidated the copper.

Can I print directly on to a sheet of copper then glue it to PCB
and then etch that?  What glue withstands soldering heat?

Thanks - All responses appreciated - All the best
Mike Colley
I can also be emailed at uudell.us.dell.com!sneezy!mike


From [e-mail] Tue Apr 09 17:52:32 1996
From: [e-mail] (Nstorman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How can I print directly on PCBs?
Date: 6 Apr 1996 04:02:41 -0500
Message-ID: <4k5bvh$[e-mail]>
References: <4k2b93$m1a$[e-mail]>

Sorry, I don't have any suggestions to your questions but do hope someone
does and look forward to reading them.

I have been seeking some info along these lines, though. I once read an
article ( maybe ad? ) about a process for producing multi-layer boards
using conductive ink and, I believe, mylar sheets. The idea was to print
them out and then laminate them together. I seem to remember the company
or process was called "Green something or other". Does anyone have any
information related to this process?

Thanks,

Norman



From [e-mail] Tue Apr 09 17:52:33 1996
From: "miker in Tigard, OR." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How can I print directly on PCBs?
Date: 8 Apr 1996 20:00:53 GMT
Message-ID: <4kbr9l$[e-mail]>
References: <4k2b93$m1a$[e-mail]>

Can't help with the printer, but most any flatbed plotter will work.  Just put

resist ink in the pen and plot the board.  Be careful that the plot is exactly

1-1 or things won't fit.  Most CAD programs have a means to calibrate the plot

dimensions.  I use a Tektronix 4662.  Had to write a translator to take HPGL a
nd
convert it to TEK codes. Have used AutoCad and PADS-PCB.
miker

Mike Colley <[e-mail]> wrote:

>I want to find a way to use a PC printer to print directly on
>printed circuit board raw stock for the purpose of making
>quantity 1 or two boards.  Is there a printer not expensive (read
><$600) that can do that?  I don't want to mess with several photo
>steps if I can eliminate that.
>





From [e-mail] Tue Apr 09 17:52:34 1996
From: [e-mail] (JJ Martin)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: How to setup an dual computerlink via radio. Is it possible ?
Date: Mon, 08 Apr 1996 07:32:17 GMT
Message-ID: <4ka50g$[e-mail]>
References: <4jp38s$[e-mail]> <4jt8cm$[e-mail]> <[e-mail]>
Reply-To: [e-mail]

>[e-mail] wrote:
>>
>> Franky Noten <[e-mail]> wrote:
>>
>> >I would like to setup an link between 2 computers.
>> >What's the maximum speed I can transmit on ?
>>
>> The speed of light.

Then came the term VELOCITY FACTOR.   Where velocity factor, "v", is
expressed as a percentage by :

                                v = 100c' / c

where c' represents the speed of propogation in a particular
substance, and c is the speed of light in a perfect vacuum.  Both c'
and c must be specified in the same units. -Amateur Radio Encyclopedia

-73 de wk1v



From [e-mail] Tue Apr 09 17:52:35 1996
From: "Irina N. Borisova" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: I look for metal detectors creator for technical information exchange.
Date: 5 Apr 1996 22:32:57 +0400
Distribution: world
Message-ID: <[e-mail]>




From [e-mail] Tue Apr 09 17:52:36 1996
From: Bob Winingham <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ICOM interface commands
Date: 5 Apr 1996 08:12:10 GMT
Message-ID: <4k2kkq$[e-mail]>
References: <[e-mail]>
To: [e-mail]

There are lots of commands GET the Book
It is worth it.

73




From [e-mail] Tue Apr 09 17:52:37 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Kelly Leavitt)
Subject: ICOM interface commands
Message-ID: <[e-mail]>
Summary: Request info on ICOM CI-V interface commands
Keywords: ICOM Interface
Date: Wed, 3 Apr 1996 17:44:33 GMT

Hello:
  Name here is Kelly.  I am currently builind an RS-232 interface for my ICOM
736 radio.  I will use this to control my rig from my computer instead of the
CI-V converter box ICOM sells.  I got the plans from compuserve, and the total
cost (not counting the stuff from my junk drawer) was about $5.00.  All parts
except the power supply are available from Radio Shack.

  Anyway, I would like more information on the command structure used by ICOM.
I have a brief document from compuserve, but I am sure it does not contain ALL
of the interface commands.  If nothing else, I guess I'll have to by the book
from ICOM for $15.  I fully understand the commands I have information on, but
would like to know if there are any addional commands.

Thanks in advance,
73 de Kelly
KB2SYD
([e-mail])


From [e-mail] Tue Apr 09 17:52:38 1996
From: [e-mail] (Douglas R Davis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for doppler schematics
Date: 7 Apr 96 05:51:12 GMT
Message-ID: <[e-mail]>

Subject: Looking for doppler schematics

Andreas Junklewitz wrote:
>
> I'm looking for schematics to build a doppler
> unit for 144-146MHz. Was there something in
> the QEX?
>
> Any hints are appreciated. Thank you very much
> in advance.
>
> Bye,
>         Andreas
>

Andreas check out this site for Doppler info:

http://members.aol.com/bmgenginc/

Doug
KC8CGX





From [e-mail] Tue Apr 09 17:52:39 1996
From: [e-mail] (Charles Cashion)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Morse Code Decoder
Date: 4 Apr 1996 15:41:33 GMT
Distribution: world
Message-ID: <4k0qjd$[e-mail]>
References: <4jruat$[e-mail]>

William Buck ([e-mail]) wrote ( wb> )

 wb> Can anyone tell me where I might buy a Morse Code Decoder?
 wb> I'm willing to pay between $100 & $500 for a decder. Also,
 wb> A kit would be o.k. if it comes with ready made PC Boards.
 wb> Bill Buck

The 1996 issue of the ARRL Handbook contains one you can assemble
yourself. It is on page 24 of section 22. It is the designe of
Ralph Taggart, WB8DQT. A PCB is available from Far Circuits.
The software is on the floppy which comes with the handbook.
Charles Cashion
AC5GT
--


From [e-mail] Tue Apr 09 17:52:40 1996
From: Glenn KD4ULB <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need help w/ VHF/UHF amp & 4CX250 tubes
Date: 5 Apr 1996 05:41:46 GMT
Message-ID: <4k2bqq$[e-mail]>

I recently aquired a pair of 4CX250 tubes with sockets and other odds and ends
. I'm
trying to gather as much info as possible to construct an amp for VHF/UHF work
.
Multimode possible? Dual band possible? 500+ watts possible? Minimum driver pw
r
required? Any plans, articles, schematics, hints, tips, etc. available? Any he
lp at
all will be greatly appreciated. KD4ULB
                                      [e-mail]



From [e-mail] Tue Apr 09 17:52:41 1996
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED R-390A Meters! Can Anyone Help?
Date: 3 Apr 1996 13:19:26 GMT
Message-ID: <4jttsu$[e-mail]>
References: <4jmh1t$[e-mail]>

In article <4jmh1t$[e-mail]>, George Sereikas <SE
[e-mail]> says:
>
>Thanks for reading this message. I am looking for the meters for
>my Collins R-390A receiver. One is the "Carrier Level" meter and
>the other is the "Line Level Meter". If anyone has either of
>these meters (or one of them) or knows where I can find them, I
>would appreciate your getting back to me. Thanks much!
>George
>KC2MF
>[e-mail]
>
>
Starting about 15 years ago the us federal gov required that they,
the meters be removed before being released for sale.  The meters have
radium on the needle and meter face and are quite "hot"(radioactive).
While I suspect that the level is less than a 1950 watch or clock face,
we must be protected.  I had a R392, kind of the mobile version of the
R390, and was amazed that the meter would "peg" my old civil defense
gieger counter.  Have you tried Fair Radio Sales in Lima Oh?(I would
have given the address/phone number but my catalog has "vanished")
I traded away my R392 and have recently regretted it. Bu. we can't hang
on to everything.  Of course our cat sure liked the R392 much more than
the Kenwood R2000 that replace it.  The R392 got nice and hot. And the
cat like to sleep on top of it.
Good luck.


From [e-mail] Tue Apr 09 17:52:42 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Subject: NorCal QRP Cascade
Message-ID: <[e-mail]>
Date: Thu, 4 Apr 1996 16:23:03 GMT


Home brew crew,
I would like to build the NorCal QRP club's nifty 75m/20m SSB rig.  Problem is

I can't get to the NorCal web page right now and I need to get purchase
details on my birthday wish list right away.  (XYL shopping plans imminent!)
Anyone know how much it is and where to get it?  Please respond ASAP.
Thx all!
73 de KB2TCG
[e-mail]



From [e-mail] Tue Apr 09 17:52:43 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: PC instead of keyer - CW TSR keyer shareware info
Date: Fri, 05 Apr 1996 15:33:48 GMT
Message-ID: <4k2f3g$[e-mail]>

I wrote a CW-TSR utility for PC-DOS so computer can now play role of
CW keyer. All you need is paddle and simple CW interface (1 diode, 2
resistors, 1 capacitor) connected to your serial port.

This CW TSR utility has been primarely written for s53ww - Robi
who wrote the VHFCTEST program, which is very popular in our region.

Information for HAM-SOFTVARE programmers is also provided if you
want to use it with your software.
You can download the latest version of the VHFCW and VHFCTEST from the
ftp server:

ftp.hamradio.si /pub/ham/contest/vhf
files: CWTSR.TXT, CWTSR.ZIP

for aditional information write to
PR   : S57RA @ S50BOX.SVN.EU
email: [e-mail]



From [e-mail] Tue Apr 09 17:52:44 1996
Newsgroups: rec.radio.amateur.homebrew
From: Christopher Comeaux <[e-mail]>
Subject: Powerless communication?
Message-ID: <[e-mail]>
Date: Mon, 8 Apr 1996 17:25:45 GMT

 I am wondering about the feasibility of the following scenario: A
person gets his boat wrecked on an uninhabited island nearby Hawaii.
He has no electricity, but lots of wire from his smashed up boat.
He uses it to make a directional antenna that is pointed toward
Oahu, and tuned to the FM broadcast band. Then he keys in SOS by
shorting the antenna.
 I am thinking this analogous to using a mirror to flash code using
the sun's light. In this case, interference should be created either
at the FM frequencies, or if the person was able to construct a diode,
multiples thereof.
 My question is, could this produce a detectable effect which might
have the slimmest chance of getting the person rescued; or can anyone
think of another possible example of "powerless communication"?

CC/Impulse/N2QMU


From [e-mail] Tue Apr 09 17:52:44 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Pulling a crystal up to 1000 ppm.  Doable?
Date: 7 Apr 96 05:34:33 GMT
Message-ID: <[e-mail]>

One of the old tricks to 'warp' a crystal is to put an inductor and
variable capacitor in series with it.  Depending on how "lazy" your
crystal/oscillator combination is, you may be able to warp the
crystal quite a bit.  As a Novice, I had only one 15 meter crystal and
was able to cover most of the 15 meter band with it:  It's stability
was terrible near the bottom, but it worked...  Typically, you'll
be able to move the crystal below it's original frequency more
than above it...

<Clint>


From [e-mail] Tue Apr 09 17:52:45 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Robert Watson)
Subject: Question: Xtal Grinding Technique
Message-ID: <[e-mail]>
Date: Sun, 7 Apr 1996 03:39:26 GMT


I recently was discussing with a friend of mine, a technique that seems to
be quite interesting, yet seems almost too good to be true. I was
wondering if anybody else has heard of this technique?

It is used when regrinding crystals from a lower frequency to a higher
frequency, (what else?), anyway, here goes:

You take a sheet of aluminum foil and lay it down on the workbench, and
upon the top of the aluminum foil you lay a sheet of glass. You take some
jumper wires and connect one end to the aluminum foil, and the other end
to the center conductor of your receiver. You then take the receiver and
tune in to the "target" crystal frequency. You then begin to grind the
crystal, (using Comet and water, or some other recommended abrasive, in
the figure-eight pattern), and while you are grinding, you will begin to
hear the oscillation of the crystal through the receiver.

I was told that this will bring the frequency to close proximity, but I
was thinking you could also use the audio filters to "narrow" the target.

Has anybody tried this out at one time or another, and if so, do you have
any further suggestions that may help me (or others)?

Thanks much,

Robert/KJ7BO
[e-mail]



From [e-mail] Tue Apr 09 17:52:46 1996
From: William W Janssen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question: Xtal Grinding Technique
Date: 7 Apr 1996 12:19:34 GMT
Message-ID: <4k8bsm$[e-mail]>
References: <[e-mail]> <[e-mail]>

Rocci <[e-mail]> wrote:
>Robert Watson wrote:
>>
>> You then begin to grind the crystal,
>>
snip.....
>>
>>
>
>
>
>Modern crystals have electrodes which are plated onto both sides of
>a quartz disc, making it difficult to grind or etch the quartz without
>damaging the electrodes. You can move the resonance DOWN by depositing
>pencil lead or some other mass on the quartz surface, but this dampens
>the natural oscillation and results in a "sluggish" crystal which might
>not oscillate properly in most circuits.
>
>
snip
>
>Joe
>WA3CMQ

I have used the "loading" technique with mixed results. I have used
a pencil and the side of a piece of solder. The main problem I had
was that the vibration of the crystal caused the "loading" material
to move or fall off resulting in frequency drift. However it
worked long enough to get the proper crystal.

Bill K7NOM



From [e-mail] Tue Apr 09 17:52:48 1996
From: Charles Bolland <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec,radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc.,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave
Subject: Radio Broadcasting Database LW MW, SW
Date: Fri, 05 Apr 1996 23:30:26 -0500
Message-ID: <[e-mail]>

A Stand alone IBM compatible Broadcasting Radio Station Database Program
for longwave, Mediumwave, and Shortwave.  Over 4,000 records included
already.  Completely, read/write and update-able.

If you would like a copy, send your Mailing Address - the one you
receive letters with - and your E-mail address.  The program will be
sent back via E-mail to you within 24 hours.

Your mailing address will be used to send you further details on a full
featured database program called Voyageur.   All information is
confidential.........!

Hope to hear from you.

Chuck Bolland
[e-mail]

P.O. BOX 18402
WEST PALM BEACH, FL 33416

KA4PRF


From [e-mail] Tue Apr 09 17:52:48 1996
From: [e-mail] (Spencer Trombly)
Newsgroups: rec.radio.amateur.homebrew
Subject: radio telemetry module
Date: 5 Apr 96 10:53:43 GMT
Message-ID: <[e-mail]>

 I use several PACIFIC CREST RFM96 radio modems to broadcast DGPS
corrections at 9600 baud and at times other types of data.
 470 MHZ
 2 WATTS
 DIGIPEATER MODE
 PASS THROUGH
 MENU DRIVEN SET UP
 SEVERAL BAUD RATES

Not cheap, license is a pain but do-able.
They work very well.
MARTEL ELECTRONICS in NH makes a little board analog to RS232 14 bit
+ sign, 2400 baud out $70, or you can buy just the IC. Uses a MAXIM
110 or 111 serial A/D.
73
spencer trombly W1GAK


From [e-mail] Tue Apr 09 17:52:49 1996
From: [e-mail] (Pablo Lewin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Rotor problem, please help :-(
Date: Mon, 08 Apr 1996 19:54:42 GMT
Message-ID: <4kbqs3$[e-mail]>
Reply-To: [e-mail]

Hi, and thank you for reading this

I have a HAM III/CD44  (CDE) rotor and controller, the rotor works
really well, however the heading indicator stopped working yesterday,
it just won't "track" anymore and the needle is not physically stuck,
I fear that I may have misplaced a wire and I don't have the
schematic/owners manual.        Does anybody out there know how to find out
how the wires are connected ?, any troubleshooting techniques for the
meter?, could anybody send me the text or the GIF of the Schematic (or
both)?, where can I get an old owner's manual?/ book?

Any help appreciated, thanks in advanced

Pablo Lewin
WA6RSV
please reply through e-mail to  [e-mail]



From [e-mail] Tue Apr 09 17:52:50 1996
From: [e-mail] (James P. Rybak)
Newsgroups: rec.radio.amateur.homebrew
Subject: Russian Tubes
Date: 7 Apr 1996 17:34:27 -0600
Message-ID: <4k9je3$[e-mail]>




From [e-mail] Tue Apr 09 17:52:51 1996
From: [e-mail] (James P. Rybak)
Newsgroups: rec.radio.amateur.homebrew
Subject: Russian Tubes
Date: 7 Apr 1996 17:37:31 -0600
Message-ID: <4k9jjr$[e-mail]>

I need to get some replacement tubes (811A and other varieties).  Is
there any difference in quality between Sovtek and Svetlana?

Thanks.



From [e-mail] Tue Apr 09 17:52:52 1996
From: Pete McQuail <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Silver plating PCB
Date: Mon, 8 Apr 1996 21:42:03 +0100
Distribution: world
Message-ID: <$[e-mail]>
References: <[e-mail]>

In article <4k9i8i$[e-mail]>, Roy Lewallen
<[e-mail]> writes
>In article <[e-mail]>,
>   Pete McQuail <[e-mail]> wrote:
>>Does anyone know of a chemical method for silver plating PCBs? I
>>currently use silver paint but find that this can be a bit of a pain if
>>the area to be coated is large or the tracks are thin/close together. I
>>know that there is a chemical method for applying tin coats to copper.
>>Is there an equivalent for silver?
>>Pete Mcquail, G8DCJ
>
>I'm curious about why you want to do this. In my career as a design
>engineer, I've never seen a silver-plated board, just gold, tin, or
>tin/lead. Silver is widely used for conductors on thick-film hybrid
>circuits, but generally alloyed with palladium. The alloying is necessary
>because without it, the silver will migrate in the presence of applied
>D.C. (particularly in high humidity), eventually forming short-circuiting
>tendrils between conductors. The palladium-silver alloys I've seen are much
>less conductive than copper. I'd think that silver would be inferior to tin
>as a plating material because of its tendency to tarnish. It might also try
>to alloy with the underlying copper, requiring a nickel barrier, as is done
>with gold plating.
>
>Roy Lewallen, W7EL
>
>
The objective is to reduce losses and improve overall efficiency in
VHF/UHF RF circuits. As I understand it the silver layer should reduce
losses by providing a better (than copper) conductor for the 'skin
effect' currents at these frequencies. I assume that this is why silver
plated wire is recomended in these RF circuits. Obviously gold would
provide an even better conductor but my finances do not run to providing
gold plating services for one off type runs. I suspect also that a
permit would be required here in the UK for such activities.
Would not the problems of surface corrosion etc be reduced or even
eliminated by the use of a non-conductive varnish?
Pete Mcquail, G8DCJ


From [e-mail] Tue Apr 09 17:52:53 1996
From: [e-mail] (Bruce Micales)
Newsgroups: rec.radio.amateur.homebrew
Subject: Solar power station
Date: 6 Apr 1996 05:36:54 GMT
Message-ID: <4k4vtm$[e-mail]>

Hello all,

I am thinking of putting together a portable packet station for field
and/or emergency work.  One source of power would of course be
rechargeable batteries.  However, I also thought one might be able to
use solar panels to help run the radio (13.5 DCV, 1200 mAhr),a laptop
(12 DCV, 1.7A, and a TNC (6-25 DCV, <40 ma).

Does anyone know of a place that sells solar panels?  I have found a
few but they appear a bit high.  On the other hand this is my first
attempt so all the help would be welcomed.  Thank you

Bruce Micales WA2DEU
E-mail: [e-mail]
Packet : [e-mail]



From [e-mail] Tue Apr 09 17:52:54 1996
From: [e-mail] (Gary E Snyder Jr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solar power station
Date: Sun, 07 Apr 96 17:34:20 GMT
Message-ID: <4k8v0k$[e-mail]>
References: <4k4vtm$[e-mail]>

I have found a reasonably good source of solar panels is
Jade Mountain
pobox 4616
Boulder ,CO 80306-4616
[phone]

They have new and used stuff that would probably give you what you need. The
only bad part about this company is there 'appropriate' terminoligy.
It allways sounds so judgemental!

The bad news is the cost per watt of output goes up the smaller the pannel is!
a 60 watt used panel is $220 ($3.67/watt)
a nice portable 10 watt unit is $135, ($13.50/watt) but these size/price
ratios vary.

anyway call them and get there catalog.

In article <4k4vtm$[e-mail]>, [e-mail] (Bruce

Micales) wrote:
>Hello all,
>
>I am thinking of putting together a portable packet station for field
>and/or emergency work.  One source of power would of course be
>rechargeable batteries.  However, I also thought one might be able to
>use solar panels to help run the radio (13.5 DCV, 1200 mAhr),a laptop
>(12 DCV, 1.7A, and a TNC (6-25 DCV, <40 ma).
>
>Does anyone know of a place that sells solar panels?  I have found a
>few but they appear a bit high.  On the other hand this is my first
>attempt so all the help would be welcomed.  Thank you
>
>Bruce Micales WA2DEU
>E-mail: [e-mail]
>Packet : [e-mail]
>

Gary Edwin Snyder Jr.
[e-mail]
http://www.frugal.com/~snyder


From [e-mail] Tue Apr 09 17:52:56 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Source for parts
Date: 8 Apr 96 21:09:18 GMT
Message-ID: <[e-mail]>

I saw something about this place a while back on ham-homebrew but had
no opportunity to get there until last Friday.

The place is City Electronics in Bellaire (Houston).  He is,
unfortunately, only open 9 to 5 Mon-Fri.  He has a phone
(713-663-6066) and does MC/Visa and shipping.

He has fun stuff like high wattage pots and tube sockets.  He also has
the more modern stuff like toroids (a *really* good selection), a good
selection of things like Plate chokes for BA rigs, and miniature pots
for things like your HT.  One other thing he has is a good assortment
of knobs which might be of interest to the BA folk.  He might also be
a source for BA transformers.

The prices were quite reasonable.  A lot of stuff was much less
Electronics Part Outlet here in Webster.

He even has speaker grill cloth which I hadn't seen anywhere in
*years*.  (each of my 3 children has, at the age of 18 months,
destroyed a speaker).

all in all a good source for some of the off the wall stuff.

Ray Mack
WD5IFS
[e-mail]
Friendswood, TX



From [e-mail] Tue Apr 09 17:52:57 1996
From: [e-mail] (Schmidt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Sweep tubes
Date: 5 Apr 1996 19:41:40 GMT
Distribution: world
Message-ID: <4k3t1k$[e-mail]>



>>>>
>>>>I think Yaesu used the 6146 tube.  Is this a good choice?
>>>>
>>
>>Actually the Yaesu FT101B through the FT101E used a pair of 6JS6C sweep
>>tubes driven by a 12BY7A.
>>
>>Not the best transmitter tubes in the world, but the story I heard was
>>that in the '50s-'70s rf tubes like the 6146s were not available to the
>>Japanese,(embargos or whatever) so they used whatever they had.
>>
>>73s
>>
>>Wayne,  KI$XR
>>
>>
>Aside from problems the
>Japanese may have had, why would anyone have wanted to make a sweep
>tube amplifier anyway?
>
>Tom Donaly KA6RUH
>
>Sweep tubes can handle larg PEAK currents. Ideal for low duty cycle
>equipment. They were cheep also.

>
Bill K7NOM

My two cents on sweep tubes. I bought a Drake TR4C back in 1975. It
uses 3 (if I remember right, as my dad has the radio now) 6JG6's that
have a 300 watt PEP input rating. Some time in the last 20 years I bought
a new set of finals. Only thing is that they never needed to be replaced!
I used the radio for years, and now my dad uses the radio at least two
hours a week (as I talk to him at least that long every week on 20m). The
old sweep tubes just keep on trucking (although we both used a small fan
mounted over the finals). Drake reason for using 6JG6's :they wanted a
lower profile rig, which was not possiable with the 6146's. I still wish
it had 6146's though!

Steve KG5KL


From [e-mail] Tue Apr 09 17:52:58 1996
From: KF9CM [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting tubes!
Date: 5 Apr 1996 11:57:05 GMT
Message-ID: <4k31qh$[e-mail]>
References: <4jrv98$[e-mail]>

>   [e-mail] (Tom Bruhns) writes:
>  Dino Darling ([e-mail]) wrote:
>  : What is a good RF tube capable of 100 watts output ...?
>
>  I'm surprised nobody (until now) has mentioned the 811A as a
>  possibility in this power range.  It's capable of a bit more
>  power than this, but it should run 100 watts out pretty
>  comfortably.
>
>  --
>  Cheers,
>  Tom
>  [e-mail]
>
>>>>
I concur The 811A is the best bang for the buck ($14 new). Operating
classs B Grounded Grid the output is aprox, 150 watts out with 15 watts
drive.

                                   Good luck Gary KF9CM



From [e-mail] Tue Apr 09 17:52:59 1996
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting tubes!
Date: 1 Apr 96 08:41:42 GMT
Message-ID: <claude.828348102@bauv111>
References: <4jg1om$[e-mail]> <4jhicb$[e-mail]>
Reply-To: [e-mail]

[e-mail] (K2EK) writes:

>EVERYONE used a pair of 6146Bs with a 12BY7 driver... well, almost
>everyone.

But the 6CL6 is a more robust driver than the 12BY7.
--
Claude
([e-mail])
The opinions expressed above represent those of the writer
and not necessarily those of her employer.


From [e-mail] Tue Apr 09 17:53:00 1996
From: Norm Hammar <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB:Electrolytic 40-40-20 mfd, 250vdcw
Date: Wed, 03 Apr 1996 13:19:35 -0500
Message-ID: <[e-mail]>

Please email [e-mail]


From [e-mail] Tue Apr 09 17:53:01 1996
From: George Harris <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb
Subject: YAESU FT-200 Help?
Date: 8 Apr 1996 13:20:33 GMT
Message-ID: <4kb3r1$neu$[e-mail]>

Hi Everyone,
My Friend has an Yaesu Ft-200 Radio and is looking for a
possible modification to include 11 meter capability. Does anyone
know of such a modification. All answers are appreciated.

Thanks!!!!!!
73,
George

--
Don't do anything that I wouldn't, At least don't get CAUGHT!!!!


From [e-mail] Sun Apr 14 17:43:48 1996
From: [e-mail] (Malezet Jean-Pierre F6FLV)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radi
Subject: Re: ! Attention Software Authors !
Date: 13 Apr 1996 13:09:11 GMT
Message-ID: <4ko91n$[e-mail]>
References: <NEWTNews.829091616.3336.amsoft@amsoft>

In article <NEWTNews.829091616.3336.amsoft@amsoft>, [e-mail] says:
>
>
>ATTENTION AUTHORS OF AMATEUR RADIO, SWL, AND ELECTRONIC SOFTWARE!
>
>If your software is shareware, freeware or public domain, AmSoft
>would like to include your software in our publication of The
>World of Ham Radio CD-ROM.  If you only have a commercial version
>you may want to think about a shareware version with registration.
>Most authors have had good returns on registrations from the first
>year of publishing thier software on this CD-ROM.  If 50 users
>registered your program from our CD-ROM publication, what would that
>convert to in income for you?  Please give this some thought and let
>us here at AmSoft know if you would like to publish your works on
>the AmSoft CD-ROM.  If you decide to publish on our CD please
>upload your software to our FTP site and send me an E-Mail letter of
>authorization to publish your software on the AmSoft CD-ROM.
>
>NOTE: DEADLINE FOR NEXT CD-ROM IS APRIL 29, 1996
>
>The FTP site is HAMSTER.BUSINESS.UWO.CA directory /PUB/AMSOFT
>
>
>
>
I give you authorization to publish my software on the AmSoft CD-ROM.
The FTP site of this software is ftp.ucsd.edu
Directory :"/hamradio/packet/tcpip/incoming "
The name is CWMSTXRX.ZIP and CWMSTXRX.TXT

Jean-Pierre MALEZET F6FLV


From [e-mail] Sun Apr 14 17:43:49 1996
From: Markus Buehler <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 10m Conversion President Harry
Date: Fri, 12 Apr 1996 20:44:25 -0700
Message-ID: <[e-mail]>

Thank you for reading this.
I got a cb radio president harry. It's an AM/FM rig. Are there any
modification ideas for the 10 m band ? Which is the best way to
build a repeater shift ?
Thank you for any tips.
Marc  HB9CPW


From [e-mail] Sun Apr 14 17:43:50 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 2N2156
Date: 12 Apr 96 12:09:03 GMT
Message-ID: <[e-mail]>
Reply-To: [e-mail]

This is a very old transistor, I doubt it's in production any more.

I found it's specs in an old (1974) Motorola data manual and they may
help you locate a sub.  It's a PNP Germanium power transistor in a
TO-36 (doorknob) package.  Maximum Collector-Emitter voltage is 30VDC.
Maximum collector current is 30 Amps.  The nominal hFE (beta) is 105 at
5 Amps.  It's rated for a maximum heat disipation of 170 watts.  Common
emitter cutoff frequency is 2.7kHz (nominal).

Pin-out looking down at the terminal side:

            -----         o - index pin and case
          /   o   \       1 - BASE
         (  2 3 1  )      2 - EMITTER
          \       /       3 - COLLECTOR, mounting stud and case
            -----

>From these specs I'd guess it's good for a DC voltage regulator's pass
transistor or a low frequency DC to AC power inverter.

Happy hunting and 73

        =o           =o           =o           =o           =o
      _ /-_        _ /-_        _ /-_        _ /-_        _ /-_
....(_)>(_) .....(_)>(_) .....(_)>(_) .....(_)>(_) .....(_)>(_)

      Lynn Richardson, Lee's Summit, Mo
      [e-mail]
      [44.46.176.3]

     o=           o=           o=           o=           o=
    _-\_         _-\_         _-\_         _-\_         _-\_
   (_)<(_)..... (_)<(_)..... (_)<(_)..... (_)<(_)..... (_)<(_)...


From [e-mail] Sun Apr 14 17:43:51 1996
From: Colin Schmutter
Newsgroups: rec.radio.amateur.homebrew
Subject: 2N2156 transistor
Date: 10 Apr 1996 04:54:14 GMT
Message-ID: <4kfetm$[e-mail]>

I am looking for a source for 2N2156  transistors.

If these are unavailable what would be an equivalent?

Any help would be appreciated.

Please reply to [e-mail]

Colin

VE7CQH



From [e-mail] Sun Apr 14 17:43:52 1996
From: [e-mail] (John R. Cunliffe)
Newsgroups: rec.radio.amateur.homebrew
Subject: 3cx400U7
Date: Fri, 12 Apr 1996 16:36:57 GMT
Message-ID: <4km0po$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]

Hi
I am looking for a socket for a 3cx400U7 tube. If you have one in your
parts box and have no use for please trop me a line.
Thanks,  John
=====================================
John R. Cunliffe  N2NEP
[e-mail]
http://www.frontiernet.net/~cunliffe




From [e-mail] Sun Apr 14 17:43:52 1996
From: [e-mail] (Mike)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-1000 Tube and Socket For Sale
Date: 10 Apr 1996 23:42:34 GMT
Message-ID: <4khh1b$[e-mail]>

Im cleaning the shack and also trying to raise some spending money for a
trip in a couple weeks.
I have an Eimac 4-1000A tube and Socket I'll take $75.00 plus shipping.
Please leave voice # if interested.
Thanks
Mike
[e-mail]
[e-mail]





From [e-mail] Sun Apr 14 17:43:53 1996
From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-1000A amplifier on 2 meters?
Date: 11 Apr 96 16:06:49 GMT
Message-ID: <[e-mail]>

  I have been looking over the specs for the 4-1000A and the 4PR1000 tubes and

was wondering if  anyone ever used one around 144 MHz. I am currently working
on a HF amplifier and need to build a 2 Meter one as well. The specs for
these tubes are good for up to 110MHz but at higer frequencies they are
screen grid neutrlzed by using a series adjustable capacitor to ground. If
they have too great of lead inductance this may not work.
  A 4CX or 3CX series tube would obviously be a better choice but I thougt
it would be intersting to make one with a tube that glows.
  Please let me know if you have seen anything in a magazine or know anyone
that has had some success in doing this.

 73
 Bill ko4ww


  William L. Fuqua III  P.E.  E-mail [e-mail]  Phone [phone]
5
  Department of Physics and Astronomy      CP-177 Chem. Phys. Bldg.
  University of Kentucky ,                 Lexington, Ky 40506-0055





From [e-mail] Sun Apr 14 17:43:54 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4-1000A amplifier on 2 meters?
Date: 11 Apr 1996 15:36:31 -0400
Message-ID: <4kjmvv$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>,
[e-mail] (William L. Fuqua III) writes:

> Please let me know if you have seen anything in a magazine or know
anyone
>that has had some success in doing this.
>
> 73
> Bill ko4ww

Bill,

The internal leads are too long. The 4-1000 is barely usable in the FM
BCB, and difficult to use at 30 MHz.

Stay away from it if you have other choices, even for HF work, if you plan
on using it above 20 meters. They can be made to work, but they can be
headaches even on ten and fifteen.

73 Tom


From [e-mail] Sun Apr 14 17:43:55 1996
From: [e-mail] (mkeitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6146 tubes
Date: 5 Apr 1996 18:21:02 GMT
Message-ID: <4k3oae$[e-mail]>
References: <4jgila$[e-mail]>

In article <4jgila$[e-mail]>, [e-mail] says:
>
>Does  anybody know what the differences are between a 6146B and a 6146W
> transmitting tube?

There was considerable discussion about this last summer.  As I remember,
the conclusion was that the 6146W was a military-grade version of the
6146A, having a 25W plate dissipation rating.  Therefore the 6146B, with
a 35W rating, was considered superior for most uses.

-Mike KD4QDM


From [e-mail] Sun Apr 14 17:43:56 1996
From: Don Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 6146 tubes
Date: 13 Apr 1996 01:30:07 GMT
Message-ID: <4kn02v$[e-mail]>
References: <4jgila$[e-mail]> <4klbre$[e-mail]>
To: [e-mail]

The 6146W is ruggedized, but the 6146B has increased plate dissipation.
Sooo - use the "W" if you are mobile over rough terrain, but you can get a
bigger signal out of the "B" variety if you are into pushing the amplifier
to the limits.  The ratings of the 6146W are EXACTLY the same as the 6146A.

73,

Don



From [e-mail] Sun Apr 14 17:43:57 1996
From: [e-mail] (Andy Domonkos)
Newsgroups: sci.astro.amateur,rec.radio.amateur.homebrew
Subject: Re: [Q] Modifying Ramsey SW Receiver
Date: 10 Apr 1996 15:33:35 GMT
Message-ID: <4kgkcf$[e-mail]>
References: <[e-mail]>

The Ramsey receiver is too wide at the front end, no selectivity. You will
get SW broadcasters across 10 Mhz. You're better off buying a cheap radio
shack SW receiver.

Andy



From [e-mail] Sun Apr 14 17:43:58 1996
From: [e-mail] (Rich Mulvey)
Newsgroups: sci.astro.amateur,rec.radio.amateur.homebrew
Subject: Re: [Q] Modifying Ramsey SW Receiver
Date: 10 Apr 1996 21:51:02 GMT
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]

On Wed, 10 Apr 96 09:44:04 PDT, [e-mail] <[e-mail]
anto.com> wrote:
>
>I have a question.
>
>
>Before I commence work on a 18mhz - 22mhz receiver for
>monitoring Jupiter, can I simpley modify the filter section of
>a Ramsey shortwave kit for this range.

   Well, it's generally difficult to modify something that isn't there... :-)
( Ramsey's are known for their very poor front ends and transmitter
filtering. )

- Rich

---
Rich Mulvey, aa2ys                                        Rochester, NY   USA
[e-mail]
[e-mail]
aa2ys@wb2psi.#wny.ny.us



From [e-mail] Sun Apr 14 17:43:59 1996
From: [e-mail] (Andre Kesteloot)
Newsgroups: sci.astro.amateur,rec.radio.amateur.homebrew
Subject: Re: [Q] Modifying Ramsey SW Receiver
Date: 11 Apr 1996 13:53:40 -0400
Message-ID: <4kjgv4$[e-mail]>
References: <[e-mail]> <4kgkcf$[e-mail]> <4khb5k$[e-mail]>

In article <4khb5k$[e-mail]>,
David W. Knisely <[e-mail]> wrote:
>[...]
> I highly recommend the Sony ICF 7600G (available
> from Grove
> Enterprises for near $200).
>[...]
>David Knisely, KA0CZC, Beatrice, Nebr.
>
>
>
Indeed it is a nice receiver.
FYI,  it is available at Electronic Equipment Bank (EEB) 703 938-3350  for
$179.95

Andre Kesteloot N4ICK




From [e-mail] Sun Apr 14 17:44:00 1996
From: [e-mail]
Newsgroups: sci.astro.amateur,rec.radio.amateur.homebrew
Subject: [Q] Modifying Ramsey SW Receiver
Date: Wed, 10 Apr 96 09:44:04 PDT
Message-ID: <[e-mail]>


I have a question.


Before I commence work on a 18mhz - 22mhz receiver for
monitoring Jupiter, can I simpley modify the filter section of
a Ramsey shortwave kit for this range. I have not yet seen the
kit nor the schematic, I have however looked over the 118-136mhz
receiver they have for aircraft reception. I believe they may
be using a similar circuit based on the Signetics frequency
converter (NE602). Any information would be helpful. I'd rather
make modifications to an existing receiver then build one from
scratch, however, I'm not opposed to doing so... Any thoughts, or
ideas would greatly be appreciated...

Thanks,

Gary-



From [e-mail] Sun Apr 14 17:44:01 1996
From: [e-mail] (Ross Boswell)
Newsgroups: sci.astro.amateur,rec.radio.amateur.homebrew
Subject: Re: [Q] Modifying Ramsey SW Receiver
Date: 11 Apr 1996 19:53:23 +1200
Message-ID: <4kidpj$[e-mail]>
References: <[e-mail]> <4kgkcf$[e-mail]> <4khb5k$[e-mail]>

David W. Knisely ([e-mail]) wrote:
: I highly recommend the Sony ICF 7600G (available from Grove
.
: It is quite sensitive . . .

I have one of these (at least, mine is labelled ICF-SW7600) and while
I like it a lot, I would NOT praise its sensitivity.
It seems rather disappointing, especially above 12MHz.

Does anybody out there have measurements of its sensitivity?
--
+---------------------------------+-----------------------------------+
| Ross Boswell                    | Email : [e-mail]          |
| Department of Pathology         | FAX   : [phone]            |
| Christchurch School of Medicine | Phone : [phone]            |
| NEW ZEALAND                     | Post  : PO Box 4345, Christchurch |
+---------------------------------+-----------------------------------+


From [e-mail] Sun Apr 14 17:44:02 1996
From: [e-mail] (MThompson)
Newsgroups: rec.radio.amateur.homebrew
Subject: All band antenna.
Date: 9 Apr 1996 03:47:12 GMT
Message-ID: <4kcmk0$[e-mail]>

Does anyone have any suggestions on how to make an all band antenna.  I
presumed the best would be a discone, its will be used for receiving
only.



From [e-mail] Sun Apr 14 17:44:03 1996
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can't catch me
Date: Thu, 11 Apr 96 20:16:01 GMT
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]

In article <[e-mail]>
           [e-mail] "Ed Burress" writes:

> In article <[e-mail]>
>  [e-mail] (RUSS WUERTZ) writes:
>
> A bunch of QRM deleted.
> Wow! Way too much time too close to RF.
>
> Now for the homebrew question...
> Does anyone have a source here in the US for a MuRata 455J1 SSB filter used
in
>  the Epiphyte-2 Transceiver?
> How about you folks in other countries, are they available there?  I have
>  checked Mouser, Newark, DC, and DigiKey
> without success.

Cirkit, here in the UK, have the CFM455J1 in their catalogue, at #9.40.
It's stock number is 16-45513. Cirkit's phone number is [phone].

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


From [e-mail] Sun Apr 14 17:44:04 1996
From: [e-mail] (Ed Burress)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can't catch me
Date: 11 Apr 1996 09:35:13 -0700
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>

In article <[e-mail]> russ.wuertz@spacecoas
t-bbs.com (RUSS WUERTZ) writes:

A bunch of QRM deleted.
Wow! Way too much time too close to RF.

Now for the homebrew question...
Does anyone have a source here in the US for a MuRata 455J1 SSB filter used in
 the Epiphyte-2 Transceiver?
How about you folks in other countries, are they available there?  I have chec
ked Mouser, Newark, DC, and DigiKey
without success.

Thanks,
Ed Burress
KC7GFX




From [e-mail] Sun Apr 14 17:44:05 1996
From: [e-mail] (Qwick)
Newsgroups: rec.radio.amateur.homebrew
Subject: CD MODS NEEDED
Date: Wed, 10 Apr 1996 23:40:50 GMT
Message-ID: <4kh9lp$[e-mail]>

I need mods for the following:
Uniden 66
Ranger 2950
Cobra 29  23-channel
and most important.. Midland ??  a cheapy from walmart
Any other info on linears and amplifiers would help a lot too.
Thanks...




From [e-mail] Sun Apr 14 17:44:06 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Diff between Tx and Rx Crystals?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]> <4kblq2$[e-mail]>
Date: Tue, 9 Apr 1996 17:13:46 GMT

In article <4kblq2$[e-mail]> [e-mail] (Tom Bruhns) writes
:
>Gary Coffman ([e-mail]) wrote:
>: The former is the gotcha, make sure that you know the
>: frequency on which the crystal actually oscillates. It may not be the
>: frequency stamped on the case with crystals intended to be used in
>: receivers.
>
>Of course, the same is true of crystals stamped with the transmitter
>frequency:  the crystal likely will oscillate on a fraction (like 1/9 or
>1/12) of the actual transmitter output frequency;

Yeah, if the crystal is for a VHF or UHF rig you can count on this.
If it is for a HF rig, it may operate on its fundamental or an overtone.

>If you are lucky, the crystal may be stamped with _both_ the frequency of
>oscillation and the radio input/output frequency.

Yeah again, but push come to shove you can always rig up a simple
oscillator circuit and *measure* the frequency of the unknown crystal.
If it's an overtone crystal, you'll get the fundamental instead, and
that won't be the frequency or channel stamped on the crystal, or an
exact submultiple thereof. That's a clue, and you can then try it in
an overtone circuit and try to find where it really is intended to
oscillate. Or just use it in fundamental mode if that turns out to
be convienent.

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


From [e-mail] Sun Apr 14 17:44:08 1996
Newsgroups: rec.radio.amateur.homebrew
From: Monty Wilson <[e-mail]>
Subject: Re: Direct-modulated AM with solid state final? (thanks)
Message-ID: <[e-mail]>
Date: Tue, 9 Apr 1996 17:59:36 GMT
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>

[e-mail] (Gary Coffman) wrote:
>In article <[e-mail]> Monty Wilson <mwilson@banga
te.compaq.com> writes:
>>...If I ever want to try this, I'm definitely going to start with a 50W
>>CB pre-driver and hack on THAT, rather than mess up my main rig.
>
>Ugh. You *can* just use your ham rig in CW mode with reduced carrier
>output to drive an external class C stage that you "plate" modulate.

That's what I meant.  I would modify the predriver to go class C, and do
all the other stuff you guys have been telling me about, but do it to the
external amp stage, not my main station rig.

>Actually today I wouldn't do that. I'd run the external stage Class D,
>and vary the switching duty cycle...

I thought about that too, but that's something I need to learn a LOT more
about before I go throwing signals on the air.  Thanks.  You wouldn't
happen to have a good text to recommend on PWM, would you?

>>When ten meters comes back and I want to get on AM again, I'm getting
>>a peak-reading wattmeter so I can adjust my transmitter properly.

>Wrong tool. You need a modulation monitor scope. Any old oscilloscope
>that lets you drive both the horizontal and vertical plates will do.

If I run across one at a hamfest, I'll certainly pick it up.  But finding
one of these working would be more difficult than a peak reading wattmeter.
I thought the latter would allow me to view my 20W unmodulated carrier, then
to speak in a normal voice and adjust my modulation until I could see the
correct peak value on the meter.  I would then be able to learn more about
what my final stage could really do before it starts sounding like bad audio.

Also I could get a better idea what my signals were doing when I'm on SSB.

>>There are still some folks out there knowledgeable enough about AM and
>>nice enough to lend a hand.
>
>Some of us still have to do it for a living. :-(

Yes but you still volunteer your valuable advice free of charge to us
lost souls out here floating adrift in SSBland, rescuing us, well never mind.
Thanks again again Gary, and 73,

--
.........Monty.
[e-mail]




From [e-mail] Sun Apr 14 17:44:09 1996
From: Tom Medlin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DTMF Decoder
Date: 11 Apr 1996 02:30:33 GMT
Message-ID: <4khqs9$[e-mail]>
References: <[e-mail]> <4k8t5v$[e-mail]>
To: [e-mail]

I think radio shack sells the ssi202 decoder chip.

please check out my radio shack at http://www.cris.com/~tcmedlin



From [e-mail] Sun Apr 14 17:44:09 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: misc. 2meter equipment
Date: 8 Apr 1996 19:11:45 GMT
Distribution: world
Message-ID: <4kbodh$[e-mail]>

In article <[e-mail]>, William Leonard
<[e-mail]
>MFJ SWR/power/field strenght meter.....make an offer
>
10 bucks?
kb9mma
jim


From [e-mail] Sun Apr 14 17:44:11 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: HAM III/CD44 (CDE) Rotor Problems, help!
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4kbprb$[e-mail]>
Date: Tue, 9 Apr 1996 17:05:50 GMT

In article <4kbprb$[e-mail]> [e-mail] writes:
>I have a HAM III/CD44  (CDE) rotor and controller, the rotor works
>really well, however the heading indicator stopped working yesterday,
>it just won't "track" anymore and the needle is not physically stuck,
>I fear that I may have misplaced a wire and I don't have the
>schematic/owners manual.       Does anybody out there know how to find out
>how the wires are connected ?, any troubleshooting techniques for the
>meter?, could anybody send me the text or the GIF of the Schematic (or
>both)?, where can I get an old owner's manual?/ book?

The rotator uses a pot for position reporting. Use your VOM to
find the pair of wires that change resistance when you turn the
rotator. That's the pair that go to the meter circuit. To find
the meter circuit connection on the control box, use the VOM to
find the pair of terminals that have a DC voltage on them *when
the rotator is not turning* but the box is on. That's where the
pot connects. The motor winding terminals have an AC voltage
on them when the rotator is commanded to turn.

Now assuming you have things wired correctly, and it still doesn't
work, you may be missing the DC voltage, or the pot may have failed.
Your VOM checks should have told you which has happened. If the
pot has failed, replace it. If the DC sense voltage is missing,
you'd better find a diagram for the control box. Of course you
might just have a break in the rotator cable. Ring that out if
you can before plunging into the innards of the rotator.

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


From [e-mail] Sun Apr 14 17:44:12 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Help with older FT-530?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4kd6b3$[e-mail]>
Date: Tue, 9 Apr 1996 17:22:56 GMT

In article <4kd6b3$[e-mail]> [e-mail] (KD4GEU) writes:
>Hello:
>     I have an older Yaesu FT-530 that's about 3 years old
>and its one that only took the solder pad 13 mod. My question
>is that it will only transmit up to about 456.000mHz but at
>that freq it flutters at keyup, its quite about 454.000mHz.
>
>     Does anyone have any suggestions to get the unit to
>transmit up to 470.000mHz. I did the same mod on a friend's
>530 and his will transmit up around 470.000 to my jealously.

The VCO in your unit is coming unlocked. You'd have to retune
it to make it work, but you might lose the bottom of the ham
band coverage in the process.

>     I have permission to use a 460 business band repeater,
>and would like to be able to do so with the 530.

You *do* know this is *illegal* don't you? The 530 is not
Type Accepted for land mobile use. The FCC is *really*
starting to get ticked off about people doing this.

Gary

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


From [e-mail] Sun Apr 14 17:44:13 1996
From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help: need altimeter device for ham balloon
Date: 9 Apr 1996 14:46:27 GMT
Message-ID: <4kdt83$[e-mail]>
References: <4k8t7p$[e-mail]>
Summary: there is such a project

In Article '<4k8t7p$[e-mail]>', through puissant locution, 'acc@p
obox.com' soliloquized:
>Me and a few of the local hams are putting together an Amateur Balloon
(A few local hams and I... :-)
>We are in the fist stages of equipment design and I'm the lucky (or is
>that unlucky) one who gets to build the instrument package.  For the
>first flight we are going to use a Basic Stamp (I or II not sure yet)
>to send telemetry and collect data from onboard sensors.
[zap]

Greetings. See URL:

http://www.paranoia.com/~filipg/HTML/RC/F_Altim.html

comes with parts list and schematics. It's by Paolo Zini and
you will find all info in the URL.

Take care.
--
+-->Filip "I'll buy a vowel" Gieszczykiewicz | E-mail: [e-mail]
| http://www.paranoia.com/~filipg/| Sci.Electronics, RC, Misc FAQs + MORE!
| Enjoy your job, work within the law, make lots of money : Choose any two.
| I think for myself. I listen. I make decisions. I speak what I believe.


From [e-mail] Sun Apr 14 17:44:14 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Joe Mack)
Subject: Re: Help: need altimeter device for ham balloon
Message-ID: <[e-mail]>
References: <4k8t7p$[e-mail]>
Date: Tue, 9 Apr 1996 15:33:35 GMT

In article <4k8t7p$[e-mail]> [e-mail] (Brian) writes:
>Me and a few of the local hams are putting together an Amateur Balloon
>
>We are in the fist stages of equipment design and I'm the lucky (or is
>that unlucky) one who gets to build the instrument package.  For the
>first flight we are going to use a Basic Stamp (I or II not sure yet)
>to send telemetry and collect data from onboard sensors.
>
>I have completed the temperature sensors and i am looking for a way to
>determine the altitude of the balloon (low cost needed)  I have heard
>of a few chips or rather modules by motorola that do this.  If anyone
>can help we would be most greatful.
>
>
>Thanks   Brian McClure  ( N8PQI )
>email: [e-mail]
>phone: [phone]
>
>

Radiosondes are available sometimes surplus and they have a nice barometer
with a wiper arm on a variable resistor. Mine cost $5 for the whole
radiosonde at a ham fest. I guess you could start with Surplus
of Nebraska, or go to Dayton.

        Joe NA3T
        [e-mail]



From [e-mail] Sun Apr 14 17:44:16 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Homebrew?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4kjmvv$[e-mail]> <4kl4dn$[e-mail]>
Date: Sat, 13 Apr 1996 17:19:44 GMT

In article <4kl4dn$[e-mail]> [e-mail] (KN5S) writes:
>I am in the process of switching internet connections, so for a few days I
>receive this newsgroup on both AOL and Netscape.
>
>The strange thing is, that the messages I receive are different.  Some
>arrive only via one connection, some via the other, and some on both, but
>often at very different times, sometimes a day apart.
>
>Can anyone explain this?

Sure. Usenet is a cooperative of servers located throughout the world.
Each exchanges posts with at least one other. Eventually every server
in the system gets all posts (unless there was a communications failure
somewhere in the forwarding net). Because each post may take a different
path through the forwarding net, different servers will receive the post
at different times. Some servers only forward to their partners once a
day, so the delay can be substantial if many servers have to be traversed.

There is no central control or central plan. Usenet is a chaotic system,
and connections are at the whim of individual system administrators. So
there can be routing loops and routing stubs, IE some parts of usenet
may be unreachable from other parts of usenet. So not all posts make it
to all servers. To avoid that, most usenet servers have multiple forwarding
partners scattered widely across the net so that if one route is a stub,
another will not be, and the posts will propagate. This often leads to
many duplicate posts arriving at a given server, but the news server
software detects this and deletes duplicates automatically so that the
user should only see the post once on a given server.

If you read news on more than one server, you'll see the same articles
again, though perhaps not in the same order or at the same times. This
is a natural result of the way the system operates. If you see a post
on one server but never on the other, that may mean there's a routing stub
somewhere in the path of the one who didn't get it. The server administrator
might need to establish another forwarding link with another partner in
a different part of the net to avoid that happening in the future. Or it
could be that the news software gagged while processing one batch of posts
so that group of posts never appeared on the server. It happens from time
to time that a batch is corrupt, or the machine processing it hiccups
at the wrong time. There is no assured delivery mechanism in usenet.

Note: usenet and internet are not synonyms. While today much of usenet
traffic is forwarded over internet links, not all of it is. Some still
travels by uucp links, or moves over other networks by other means.
Usenet is a *virtual* network, riding atop other real hardware networks,
some centrally planned, some ad hoc.

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


From [e-mail] Sun Apr 14 17:44:17 1996
From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How can I print directly on PCBs?
Date: 9 Apr 1996 14:30:20 GMT
Message-ID: <4kds9s$[e-mail]>
References: <4k2b93$m1a$[e-mail]>
Summary: two pointers

In Article '<4k2b93$m1a$[e-mail]>', through puissant
locution, '[e-mail]' soliloquized:
>I want to find a way to use a PC printer to print directly on
>printed circuit board raw stock for the purpose of making
>quantity 1 or two boards.  Is there a printer not expensive (read
><$600) that can do that?  I don't want to mess with several photo
>steps if I can eliminate that.
[zap]

Greetings. For those looking for a way, there are really three
pointers: (+ one for front panel jobs)

1) See the PCB FAQ, I keep a copy at URL:
http://www.paranoia.com/~filipg/HTML/FAQ/BODY/F_PCBfaq.html

2) I used to be into doing this at home, so I have a Home PCB
faq at URL: (see Press-n-Peel - best stuff!)
http://www.paranoia.com/~filipg/HTML/FAQ/BODY/F_Home_PCB.html

3) My boards are 2 layer and lotsa plated holes so I have them
done by hobbiest-friendly PCB places, a dated list at URL:
http://www.paranoia.com/~filipg/HTML/FAQ/BODY/F_Commercial_PCB.html

4) For those who want to try their hand at a fron panel as well,
there is a Decals FAQ at URL:
http://www.paranoia.com/~filipg/HTML/FAQ/BODY/F_Decals.html

Take care.

P.S. Now that the Repair pages are in good shape, see URL:
http://www.paranoia.com/~filipg/HTML/REPAIR/
I will be reworking the above. Lotsa work. Input welcome!
--
+-->Filip "I'll buy a vowel" Gieszczykiewicz | E-mail: [e-mail]
| http://www.paranoia.com/~filipg/| Sci.Electronics, RC, Misc FAQs + MORE!
| Enjoy your job, work within the law, make lots of money : Choose any two.
| I think for myself. I listen. I make decisions. I speak what I believe.


From [e-mail] Sun Apr 14 17:44:18 1996
From: [e-mail] (Lyndon David)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How can I print directly on PCBs?
Date: 9 Apr 1996 10:24:56 GMT
Message-ID: <4kddto$[e-mail]>
References: <4k2b93$m1a$[e-mail]>

In article <4k2b93$m1a$[e-mail]>, Mike Colley <103650
[e-mail]> says:
>
>Sorry if this is a repeating question, if it is, then flame me by
>e-mail, I'm new here.
>
>I want to find a way to use a PC printer to print directly on
>printed circuit board raw stock for the purpose of making
>quantity 1 or two boards.  Is there a printer not expensive (read
><$600) that can do that?  I don't want to mess with several photo
>steps if I can eliminate that.
>
I do my boards by printing with a laser onto mylar film, the stuff
people used to do drafting on. It makes a big difference having a
high resolution laser. 600dpi works very well. Print it out so that
the toner side will be against the board and expose to the UV to cure
the resist. It seems to work very well and is sharp enough to make
surface mount boards with.

Lyndon


From [e-mail] Sun Apr 14 17:44:20 1996
From: [e-mail] (Charles Curtis)
Newsgroups: rec.radio.amateur.homebrew
Subject: How can I print directly on PCBs?
Date: 10 Apr 96 01:39:15 GMT
Message-ID: <[e-mail]>

> I do my boards by printing with a laser onto mylar film, the stuff
> people used to do drafting on. It makes a big difference having a
> high resolution laser. 600dpi works very well. Print it out so that
> the toner side will be against the board and expose to the UV to cure
> the resist. It seems to work very well and is sharp enough to make
> surface mount boards with.
>
> Lyndon

This is an interesting method, Lyndon.  I thought that heat was was
required to tranfer the toner from the mylar to the copper
side of the board.  Please elaborate on your method.

Chuck Curtis, N2UCN

amprnet: [e-mail]           internet: [e-mail]
ax25   : n2ucn@wa2soc.#nnj.nj.usa.na     internet: [e-mail]


From [e-mail] Sun Apr 14 17:44:21 1996
From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How can I print directly on PCBs?
Date: 11 Apr 1996 00:42:06 GMT
Message-ID: <4khkgu$[e-mail]>
References: <[e-mail]>

In <[e-mail]> [e-mail] (Charles Curtis) writes:

>
>> I do my boards by printing with a laser onto mylar film, the stuff
>> people used to do drafting on. It makes a big difference having a
>> high resolution laser. 600dpi works very well. Print it out so that
>> the toner side will be against the board and expose to the UV to
cure
>> the resist. It seems to work very well and is sharp enough to make
>> surface mount boards with.
>>
>> Lyndon
>
>This is an interesting method, Lyndon.  I thought that heat was was
>required to tranfer the toner from the mylar to the copper
>side of the board.  Please elaborate on your method.
>
>Chuck Curtis, N2UCN
>
>amprnet: [e-mail]           internet: [e-mail]
>ax25   : n2ucn@wa2soc.#nnj.nj.usa.na     internet: [e-mail]

One method that I have used that I've never seen mentioned is using an
HP single pen flatbed plotter with a sharpie mounted in place of the
std pen.  The ink from a sharpie will resist the etch.

The method Lyndon described uses the photo sensitive board method.

Glenn Sparks  KI5GY


From [e-mail] Sun Apr 14 17:44:22 1996
From: Bob Winingham <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: How to setup an dual computerlink via radio. Is it possible ?
Date: 4 Apr 1996 20:19:25 GMT
Message-ID: <4k1asd$[e-mail]>
References: <4jp38s$[e-mail]> <4jt8cm$[e-mail]> <[e-mail]>
To: [e-mail]

>Well, That's not entirely true. Electrons move slower through copper
>wire than throught the void of space.
>
>

I think you will be very surprised to know
how VERY slow Electrons move through copper.ie
from one end to the other.  and if using AC they NEVER make it. :-)
---
That DARN power compamy, selling me the SAME electrons month
after month.

73




From [e-mail] Sun Apr 14 17:44:23 1996
From: [e-mail] (Steve Shumway )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: In theory only.
Date: 9 Apr 1996 02:43:00 GMT
Message-ID: <4kcirk$[e-mail]>
References: <4jn9n3$[e-mail]> <4jp3p2$[e-mail]>

In <4jp3p2$[e-mail]> [e-mail]
(WB3U) writes:
>
>Post / CC by Mail
>
>   [e-mail] ( Timothy R. Linde) wrote:
>
>>Does anybody know of something that will broadcast only 10-20 feet
>>yet over ride an amplifier with a squeel of chirp or something.?
>>I ask this on part of a couple who can't stand drive by's with loud
>>car stereos.
>
>You could probably build a jammer for the entire FM band, but that
>won't do much to a cassette deck or CD player.
>
>I once had a friend who got so frustrated with people zooming through
>his neighborhood, making it unsafe for kids to play, that one day he
>threw a rock through a car's side window.
>
>The driver got out of the car swearing like crazy and started towards
>the guy, who promptly walked into his garage and reemerged with a 12
>gauge.  End of argument.
>
>Maybe your neighborhood should consider installing gates to control
>traffic flow?
>

I understand than an atomic bomb will produce a LARGE electromagnetic
pulse which can "mess up" most radio communications gear (likely
including cassets, CD players, computers, CB radios <grin>...you name
it).

This may also slow down traffic in you neighborhood.


73 de N8SHP

Steve Shumway
[e-mail]




From [e-mail] Sun Apr 14 17:44:24 1996
From: [e-mail] (Filip M Gieszczykiewicz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: List Of Stamp Applications [960408]
Date: 9 Apr 1996 14:50:11 GMT
Message-ID: <4kdtf4$[e-mail]>
References: <[e-mail]> <4kdivc$[e-mail]>
Summary: correction!

In Article '<4kdivc$[e-mail]>', through puissant locution, 'hbrow
[e-mail]' soliloquized:
>I tried the URL's listed and also got an error message.
>I then shortened the URL to http://www.hth.com/ and got the High Tech
>Horizon's On-Line Catalog. Unfortunately it is only in Swedish.

Greetings. The other thing to try in this situation is for the
use of Micro$oft braindeath: 8.3...

http://www.hth.com/losa.htm
                           |Missing 'l'

WORKS. Which means they run Dos or Windoze. Poor people.

Take care.
--
+-->Filip "I'll buy a vowel" Gieszczykiewicz | E-mail: [e-mail]
| http://www.paranoia.com/~filipg/| Sci.Electronics, RC, Misc FAQs + MORE!
| Enjoy your job, work within the law, make lots of money : Choose any two.
| I think for myself. I listen. I make decisions. I speak what I believe.


From [e-mail] Sun Apr 14 17:44:26 1996
From: [e-mail] (Mike McCarty)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low Frequency Counter.
Date: 13 Apr 1996 01:56:43 GMT
Message-ID: <4kn1kr$[e-mail]>
References: <4j7571$[e-mail]> <4jihra$[e-mail]> <[e-mail]>

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
)In article <4jihra$[e-mail]> [e-mail] (W
B3U) writes:
)>   [e-mail] (Rane Curl) wrote:
)>
)>>I need a simple (cheap) low frequency timed counter with an LCD
)>>display. Frequencies up to ca. 100 cps; timing intervals of the order
)>>of 10-50 seconds. Seems simple enough, but I have not seen a kit or
)>>even small (ca. 5 digit) LCD display at a low price. Suggestions?
)>
)>A frequency counter with a Period function is useful for this,
)>although you have to convert the readout to frequency. In the Period
)>function, the clock is reset by the signal, not the internal timebase.
)>So, the lower the frequency, the longer the elapsed time that reads on
)>the display.  This is probably the best way to accurately measure very
)>low frequency signals.
)>
)>Other than that, I suppose you could buy a counter with a 10 MHz
)>timebase and replace the crystal with a 1 MHz or 100 KHz equivalent.
)
)Ramsey (yeah, I know) offers a frequency multipler for this use.
)It multiplies the input frequency by 10x or 100x before presenting
)it to the counter. This lets you measure low frequency signals with
)better precision (if not accuracy) on an ordinary counter. I've
)used it to precisely measure audio frequencies. An oscilloscope
)and a precision frequency source is a better method, however.

Do you need a decimal display? If not, how about taking a digital clock,
and removing the AC feed to the counter chip. Feed it instead with the
signal you're trying to count (suitably conditioned) and use it as a
counter? This would be very cheap.

Mike
--
----
char *p="char *p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}

I don't speak for DSC.         <- They make me say that.


From [e-mail] Sun Apr 14 17:44:26 1996
From: [e-mail] (Dennis Selwa)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need ideas to build a 10 meter half wave wire vertical
Date: 9 Apr 1996 22:40:43 GMT
Message-ID: <4kep1b$[e-mail]>

 I want to make a wire version of the 10 meter ringo but made with
 wire and PVC pipe


From [e-mail] Sun Apr 14 17:44:27 1996
From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need info:  National XR-50 coil form
Date: 11 Apr 1996 20:05:51 GMT
Message-ID: <4kjomv$[e-mail]>

Does anyone have specs on the National XR-50 slug-tuned
coil form?  This is a 1960s part, so dig wa-a-a-a-ay on
back into the olden days.

Anyone have one or more of these they'd sell me?  I am
thinking about building any one of several one-tubers
for 40m CW and some call for this coil form.

73 de KC5NG



From [e-mail] Sun Apr 14 17:44:28 1996
From: Don Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need info:  National XR-50 coil form
Date: 13 Apr 1996 01:46:26 GMT
Message-ID: <4kn11i$[e-mail]>
References: <4kjomv$[e-mail]>

Brings back memories - I have one or two, but I wont part with anything that
has a ceramic form.  That coil form is 1/2 inch in diameter, and has a winding
length of about 1 1/2 inches.  I know little about the tuning slug characteris
tics,
but if your goal is to produce an equivalent working model of an old circuit,
I would use a polystyrene tube (hollow) and jury rig a way to hold a salvaged
tuning slug (from junk IF xformer maybe) inside it.  At least that way you wou
ld be
able to obtain a starting point inductance just from the published number of t
urns,
and once you get the circuit working, substitute a stable coil.

The XR-50 coil form was easy to wind and mechanically stable since there was a

locking mechanism on the screw for the tuning slug.  The ceramic form was
stable with temperature (but I wouldn' vouch for the temperature stability of
the tuning slug).

Hope this helps,
73,  Don




From [e-mail] Sun Apr 14 17:44:29 1996
From: Dave Perkins <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need schematics for Linear Amp. (600 watt)
Date: 13 Apr 1996 01:16:36 GMT
Message-ID: <4kmv9k$[e-mail]>

  Me and my step-dad want to build a linear amp but we need to know what
parts to get and schematics on it...If anyone has any of the above or
maybe and article from QST on how to build one, please let me know..

  Please email me (I rarely check the newsgroups)
  Any help would be greatful

  Thanx again
  Dave




From [e-mail] Sun Apr 14 17:44:30 1996
From: Mark Mandelkern <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Newsgroup trouble
Date: 14 Apr 1996 07:27:17 GMT
Message-ID: <4kq9cl$[e-mail]>

I wrote  >Can anyone explain this?

Gary,  KE4ZV,  wrote  >Sure. Usenet is ...

Thanks, Gary.  What a great explanation.  I thought I had pushed
the wrong button.

I don't know, Gary.  I was happy most of the century with s-mail.
I am being dragged into the information age kicking and screaming.

73,    Mark   KN5S





From [e-mail] Sun Apr 14 17:44:31 1996
From: [e-mail] (Ranson J. Pelt)
Newsgroups: rec.radio.amateur.homebrew
Subject: PC Board Software???
Date: Wed, 10 Apr 1996 14:25:50 -0500
Message-ID: <[e-mail]>

Can someone tell me where I can get/buy/borrow/steal software to design
printed circuit boards??  Mac or PC

Many tnx

--
Ranson J. Pelt

[e-mail]
QST de nz4i


From [e-mail] Sun Apr 14 17:44:32 1996
From: [e-mail] (John Kolb)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Powerless communication?
Date: 9 Apr 1996 18:29:22 GMT
Message-ID: <4keaa2$[e-mail]>
References: <[e-mail]>

Christopher Comeaux ([e-mail]) wrote:
:  I am wondering about the feasibility of the following scenario: A
: person gets his boat wrecked on an uninhabited island nearby Hawaii.
: He has no electricity, but lots of wire from his smashed up boat.
: He uses it to make a directional antenna that is pointed toward
: Oahu, and tuned to the FM broadcast band. Then he keys in SOS by
: shorting the antenna.
:  My question is, could this produce a detectable effect which might
: have the slimmest chance of getting the person rescued; or can anyone
: think of another possible example of "powerless communication"?

This indeed could give you the "slimmest" chance of rescue. The very
slimmest. It is possible to receive a radio signal and reradiate it,
(usually in a different direction, as in passive repeaters to get
TV signals over mountains. With a carbon mike, it's even possible
to impose new modulation on top of the existing signal (AM modulation).

But, the problem here, is using the FM bcst band. A small change in
signal strength would not be noticable to a FM listener. Slightly better
chance of making a noticable difference in the background noise level
on the AM band.

I'd use the wire to saw down a few palm trees, and tie them together for
a raft.

John Kolb



From [e-mail] Sun Apr 14 17:44:34 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Powerless communication?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]>
Date: Tue, 9 Apr 1996 16:56:39 GMT

In article <[e-mail]> Christopher
 Comeaux <[e-mail]> writes:
> I am wondering about the feasibility of the following scenario: A
>person gets his boat wrecked on an uninhabited island nearby Hawaii.
>He has no electricity, but lots of wire from his smashed up boat.
>He uses it to make a directional antenna that is pointed toward
>Oahu, and tuned to the FM broadcast band. Then he keys in SOS by
>shorting the antenna.
> I am thinking this analogous to using a mirror to flash code using
>the sun's light. In this case, interference should be created either
>at the FM frequencies, or if the person was able to construct a diode,
>multiples thereof.
> My question is, could this produce a detectable effect which might
>have the slimmest chance of getting the person rescued; or can anyone
>think of another possible example of "powerless communication"?
>
>CC/Impulse/N2QMU

I don't think it would have a prayer of working. The passive antenna
would reradiate too little signal to have a noticable effect on an
FM receiver at a distant location. Remember that the FM receiver
has a limiter that saturates on the desired signal so your very
tiny reradiated signal would be swamped. Only if you could introduce
enough signal to generate significant multipath would there be detectable
distortion in the receiver, and that, I'm afraid, would require the
receiver to be very close by, IE you could probably holler further
than this would work.

OTOH, you have something with the idea of rectifying the signal
to use as power for generating another signal, say on the emergency
band. That might have a ghost of a chance of working. You need more
than a diode though. You need a tuned circuit you can "ring" with
the excitation so as to generate a signal on 121.5 or 243 MHz.
The signal will be horribly weak, but as we know, even very weak
signals can sometimes be detected to surprising distances.

I think I'd be looking for some zinc plating off the wreck, however.
Sticking a piece of zinc and a piece of copper into a coconut makes
a dandy little battery. *Now* I can start to generate a real signal.
Or I'd wind some of that wire around a bit of iron and make a dynamo
so that I could crank up electricity to order. Once I've got some
power, I can make a nasty spark transmitter that will annoy someone
enough to come looking for it.

In the latter vein, if all you can generate is a very weak signal,
put it where it'll be the most annoying, where the weakest signals
are received. In that regard, be aware of what frequencies radio
astronomers monitor.

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


From [e-mail] Sun Apr 14 17:44:35 1996
From: [e-mail](Tim Hynde ka8ddz qrp/Rochester, MI)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Powerless communication?
Date: 11 Apr 1996 16:56:18 GMT
Message-ID: <4kjdji$[e-mail]>
References: <[e-mail]> <4keaa2$[e-mail]> <4kecri$[e-mail]>


>In article <4keaa2$[e-mail]>, John Kolb <[e-mail]>
wrote:
>>Christopher Comeaux ([e-mail]) wrote:
>>:  I am wondering about the feasibility of the following scenario: A
>>: person gets his boat wrecked on an uninhabited island nearby
Hawaii.
>
>[...]
>
>>I'd use the wire to saw down a few palm trees, and tie them together
for
>>a raft.
>
>I'd make sure I had Ginger and Mary Anne along when I was
ship-wrecked,
>and then I'd probably not worry being rescued.

Forget the wire, I'd make a small transmitter out of coconut shells,
for more information reference "Gilligans Island" episode #16.


From [e-mail] Sun Apr 14 17:44:36 1996
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Powerless communication?
Date: 9 Apr 1996 19:12:50 GMT
Message-ID: <4kecri$[e-mail]>
References: <[e-mail]> <4keaa2$[e-mail]>

In article <4keaa2$[e-mail]>, John Kolb <[e-mail]> wrote:
>Christopher Comeaux ([e-mail]) wrote:
>:  I am wondering about the feasibility of the following scenario: A
>: person gets his boat wrecked on an uninhabited island nearby Hawaii.

[...]

>I'd use the wire to saw down a few palm trees, and tie them together for
>a raft.

I'd make sure I had Ginger and Mary Anne along when I was ship-wrecked,
and then I'd probably not worry being rescued.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are mine and should *
 * [phone]               | not be interpreted or represented as     *
 * [e-mail]      | those of Sun Microsystems, Inc.          *



From [e-mail] Sun Apr 14 17:44:37 1996
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Powerless communication?
Date: 12 Apr 1996 12:35:50 -0400
Message-ID: <4km0p6$[e-mail]>
References: <4kkpka$[e-mail]>
Reply-To: [e-mail] (PFZouave)

>Brings up a related point.  Aren't there some simple ways
>to make batteries out of acidic fruit or potatoes or
>saltwater, etc.?

A lemon and some pocket change will make a cell.


/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Sun Apr 14 17:44:38 1996
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Professional looking front panels - how?
Date: Fri, 12 Apr 1996 17:43:49 LOCAL
Message-ID: <[e-mail]>
References: <[e-mail]>

In article <[e-mail]> [e-mail].
ca   (Frank Bures) writes:
>From: [e-mail]   (Frank Bures)
>Subject: Professional looking front panels - how?
>Date: Fri, 12 Apr 1996 12:19:47 GMT

>I am soliciting an advice on how to create professionally looking front panel
s
>of electronic devices.

>Over my 37 years of both amateur and professional prototyping I tried all
>kinds of technologies, none of them with the results I want. E.g.:
>Letraset: Too time consuming, very difficult to keep equal spacing between
>letters, inability to create graphics.
>I even tried PnP Blue to transfer front panel images printed on a laser
>printer. It works _very_ well on Vector aluminum front panels. I does NOT wor
k
>at all on sand blasted panels or pre-painted panels. The toner simply would
>not stick.

In my experience, you can't beat engraved lettering. For small panels, you
might try locating a maker of signs, badges, etc and having a overlay panel
made out of plastic laminate.  It comes in various thickness and colors,
resists fingerprints and the lettering sure doesn't wear off. I have done this

on my smaller projects, keyer, speech processor and so forth.

If the engraver has a big enough setup, he can directly engrave aluminum
panels. If you protect the already painted surface with thin tape (mylar, etc)

you may get away without re-painting the panel. If not, figure on repainting
and then filling the lettering with either paint sticks (messy) or hand
filling with India ink in a drafting pen.

I know this can get expensive if you don't have access to the equipment, but
it is very professional looking and permanent.

73, Wes -- N7WS

>I would very much appreciate any advice on how to create silk-screen-like
>panels.

>Thanks

>Frank Bures, Dept. of Chemistry, University of Toronto, ON
>[e-mail]
>CompuServe:71324,1515
>[e-mail]




From [e-mail] Sun Apr 14 17:44:39 1996
From: [e-mail] (Jerry Flanders)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Professional looking front panels - how?
Date: Sat, 13 Apr 1996 01:21:19 GMT
Message-ID: <4kmvi1$[e-mail]>
References: <[e-mail]>

[e-mail]   (Frank Bures) wrote:

>I am soliciting an advice on how to create professionally looking front panel
s
>of electronic devices....

>Thanks

>Frank Bures
======================================================================
Use the overhead transparency material in your laser printer to make a
full-sized panel overlay with all the lettering properly placed.
Cutout holes and trim appropriately.

Place the above transparency over your (light-colored) front equipment
panel.

Place a pre-cut pre-drilled one-sixteenth acrylic cover over the
transparency and fasten all together with decorative-head screws.

Jerry W4UKU   [e-mail]



From [e-mail] Sun Apr 14 17:44:40 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Professional looking front panels - how?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]>
Date: Sat, 13 Apr 1996 17:23:17 GMT

In article <[e-mail]> [e-mail].
ca   (Frank Bures) writes:
>
>I would very much appreciate any advice on how to create silk-screen-like
>panels.

Create and use a real silk screen. I know of no better method, and it
is not hard to do. If you can make a PC board, you can make a silk screen.

Gary

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


From [e-mail] Sun Apr 14 17:44:41 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Mark Zenier)
Subject: Re: Professional looking front panels - how?
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Sat, 13 Apr 1996 17:15:19 GMT

in <[e-mail]>, Frank Bures wrote:
: I would very much appreciate any advice on how to create silk-screen-like
: panels.

See if you can find a copy of "Electronic Prototype Construction" by
Stephen B. Kasten.  A 10-15 year old book from Sams, back before
the computers books took over.

Or check out the local silkscreen suppliers.  That's a large and
diverse industry with a mind boggling selection of materials.
Try to find a place that supplies the local sign shops and tee
shirt makers.  At least around here (Seattle) the local art supply
shops don't have anything above the level of dabblers, while the
local sign supply place has a 3/4 inch thick catalog with all sorts
of epoxy inks and plating resists.

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



From [e-mail] Sun Apr 14 17:44:42 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]   (Frank Bures)
Subject: Professional looking front panels - how?
Message-ID: <[e-mail]>
Date: Fri, 12 Apr 1996 12:19:47 GMT
Reply-To: [e-mail] (Frank Bures)

I am soliciting an advice on how to create professionally looking front panels
of electronic devices.

Over my 37 years of both amateur and professional prototyping I tried all
kinds of technologies, none of them with the results I want. E.g.:
Letraset: Too time consuming, very difficult to keep equal spacing between
letters, inability to create graphics.
I even tried PnP Blue to transfer front panel images printed on a laser
printer. It works _very_ well on Vector aluminum front panels. I does NOT work
at all on sand blasted panels or pre-painted panels. The toner simply would
not stick.

I would very much appreciate any advice on how to create silk-screen-like
panels.

Thanks

Frank Bures, Dept. of Chemistry, University of Toronto, ON
[e-mail]
CompuServe:71324,1515
[e-mail]



From [e-mail] Sun Apr 14 17:44:43 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Subject: QRP 2m Transmitter plans??
Message-ID: <[e-mail]>
Date: Tue, 9 Apr 1996 15:56:28 GMT


Home brew crew,

Can anyone suggest inexpensive plans for a low power ~100-500mW 2m
transmitter?  The application is a hidden transmitter for a fox hunt.  A
single frequency (146.565 MHz) FM signal is required.  Input signals for PTT
and audio will be provided by my CW memory keyer (CMOS Super Keyer III from
QST/Idiom Press).

I know I could use an HT for this application, but I would like to construct
an inexpensive set up I could give to our club for use in future events
without risk to my personal radio collection ;-).  Best I've found so far are
hundred dollar kits from Ramsey or Hamtronics; I might as well buy an old
rockbound xcvr at a hamfest.
Any pointers to appropriate plans?

-Paul
KB2TCG



From [e-mail] Sun Apr 14 17:44:45 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP 2m Transmitter plans??
Date: Sat, 13 Apr 1996 04:23:17 GMT
Message-ID: <4kn6gm$[e-mail]>
References: <[e-mail]>

[e-mail] wrote:


>Home brew crew,

>Can anyone suggest inexpensive plans for a low power ~100-500mW 2m
>transmitter?  The application is a hidden transmitter for a fox hunt.  A
>single frequency (146.565 MHz) FM signal is required.  Input signals for PTT
>and audio will be provided by my CW memory keyer (CMOS Super Keyer III from
>QST/Idiom Press).

>I know I could use an HT for this application, but I would like to construct
>an inexpensive set up I could give to our club for use in future events
>without risk to my personal radio collection ;-).  Best I've found so far are

>hundred dollar kits from Ramsey or Hamtronics; I might as well buy an old
>rockbound xcvr at a hamfest.
>Any pointers to appropriate plans?

>-Paul
>KB2TCG

use the motorola mc2833 1 chip transmitter. i've done several low
power xmitters with it. it's cheap and fairly easy to bring up.btw it
an fm transmitter.
de david n5inb





From [e-mail] Sun Apr 14 17:44:45 1996
From: [e-mail] (George De Grazio)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP Newsgroup
Date: Tue, 09 Apr 1996 16:18:54 -0600
Message-ID: <[e-mail]>
References: <4ke1od$[e-mail]>

In article <4ke1od$[e-mail]>, [e-mail] (Marti Sawyer ) wrot
e:

> Is this the best newsgroup to monitor for QRP info?  I'm just getting into
> some of the kit built stuff and would like to monitor QRP related info...

> Tnx,
>
> Marti Sawyerá

Marti-

Follow the QRPlink from

http://www.qadas.com/hambrew

73,
George WF0K


From [e-mail] Sun Apr 14 17:44:47 1996
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question: Xtal Grinding Technique
Date: 11 Apr 1996 19:01:45 GMT
Message-ID: <4kjkup$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, Robert Watson <[e-mail]> wrote:
>
>I recently was discussing with a friend of mine, a technique that seems to
>be quite interesting, yet seems almost too good to be true. I was
>wondering if anybody else has heard of this technique?
>
>It is used when regrinding crystals from a lower frequency to a higher
>frequency, (what else?), anyway, here goes:
>
>You take a sheet of aluminum foil and lay it down on the workbench, and
>upon the top of the aluminum foil you lay a sheet of glass. You take some
>jumper wires and connect one end to the aluminum foil, and the other end
>to the center conductor of your receiver. You then take the receiver and
>tune in to the "target" crystal frequency. You then begin to grind the
>crystal, (using Comet and water, or some other recommended abrasive, in
>the figure-eight pattern), and while you are grinding, you will begin to
>hear the oscillation of the crystal through the receiver.
>
>I was told that this will bring the frequency to close proximity, but I
>was thinking you could also use the audio filters to "narrow" the target.
>
>Has anybody tried this out at one time or another, and if so, do you have
>any further suggestions that may help me (or others)?
>
>Thanks much,
>
>Robert/KJ7BO
>[e-mail]
>

This is a standard industry technique that we use here at the Hewlett-Packard
Santa Clara Division in our crystal fab.  The part about listening with a
radio receiver works just like you describe.  Of course, we have "slightly"
more sophisticated grinding methods than you are using.  For instance, we
hold the grinding angle to about a 1/1000 of a degree.

You might replace your Comet abrasive with the cerium stuff they sell at
lapidary supply stores that is used for polishing decorative quartz.
Also, after grinding, you should etch the quartz in hydroflouric acid.
If you don't, the quartz may disintegrate over time due to microscopic
cracks that grow.  This actually happened to early WWII vintage crystals.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Sun Apr 14 17:44:48 1996
From: [e-mail] (MHorn22377)
Newsgroups: rec.radio.amateur.homebrew
Subject: Question:Hallicrafters restoration project
Date: 10 Apr 1996 11:14:13 -0400
Message-ID: <4kgj85$[e-mail]>
Reply-To: [e-mail] (MHorn22377)

I am new to shortwave listening and need some help.
Recently, I purchased a receiver (Hallicrafters SW-500) to restore.
Does anyone know where I can find the schematics for this receiver?

Thank you in advance,
Michael R. Horn
[e-mail]


From [e-mail] Sun Apr 14 17:44:49 1996
From: [e-mail] (WB3U)
Newsgroups: sci.electronics.repair,rec.radio.amateur.homebrew
Subject: Re: Replacing SOIC & TSOP devices?
Date: Wed, 10 Apr 96 06:59:14 GMT
Message-ID: <4kftor$[e-mail]>
References: <4keo3m$[e-mail]>

   [e-mail] (Cliff Yamamoto) wrote:

>It seems easy enough to remove once the correct tip is purchased, but
>what is the best way to solder it back in?  Which method will achieve
>the best "as-new" appearance?

Flux the board, then solder the part in place quickly with the
sloppiest tip you've got.  Don't worry about shorts or (within
reason) using too much solder.  Let the part cool, then go over the
leads with *fresh* solder wick.  Don't heat all the leads at once or
the part will lift off the board and you'll have to start over. Also,
make sure your iron is hot enough to get on and off the leads quickly
with the wick.

When you're done, wash the residue off and the part will look like it
hasn't even been replaced.  :)

73,
Jack  WB3U


From [e-mail] Sun Apr 14 17:44:50 1996
From: [e-mail] (Cliff Yamamoto)
Newsgroups: sci.electronics.repair,rec.radio.amateur.homebrew
Subject: Replacing SOIC & TSOP devices?
Date: 9 Apr 1996 22:24:54 GMT
Message-ID: <4keo3m$[e-mail]>
Keywords: SOIC, TSOP, SMT


Greetings,

Does anyone have any experience or techniques they can share about replacing
surface mount IC's such as SOIC's and TSOP's?

It seems easy enough to remove once the correct tip is purchased, but what
is the best way to solder it back in?  Which method will achieve the best
"as-new" appearance?

- Fine tip pencil?     (Can be done but you need steady hands and connections
                        don't look consistant - as done by machine)
- Small butane torch?  (I'VE NEVER TRIED)
- Static-free hot air? (I'VE NEVER TRIED)
- ? ? ? ? ?

I have replaced SMT transistors and 8-pin SOIC's using my plain ol' Weller
pencil using a 1mm tip with good results.  Only thing is I just can't regulate
the exact amount of solder per lead for consistant looking connections.

Now with TSOPs and other finer pitch packages with 0.5mm lead spacing, I can't
use the ol' Weller anymore so I'm looking for other means.  Any suggestions
from those who've replaced SMT devices would be appreciated.

Thanks,
- Cliff


From [e-mail] Sun Apr 14 17:44:51 1996
From: [e-mail] (Tony Salvador)
Newsgroups: rec.radio.amateur.homebrew
Subject: RS-232 Computer Interface - FT-736R
Date: Tue, 09 Apr 96 18:57:56 GMT
Distribution: world
Message-ID: <4kec2s$[e-mail]>

Need a RS-232 interface for the FT-736R or other rigs ?
check out the free software and information on this unit
at:

http://www.gcr1.com/n5gpi/


From [e-mail] Sun Apr 14 17:44:52 1996
From: [e-mail] (Tony Salvador)
Newsgroups: rec.radio.amateur.homebrew
Subject: RS-232 to TTL interfaces ...
Date: Wed, 10 Apr 96 16:10:40 GMT
Distribution: world
Message-ID: <4kgmlc$[e-mail]>

If you are thinking about using you PC to control
you ham rig check out my page and the FT-736R CAT
section. The unit shown is usable on all rigs that
require a RS-232 to TTL level converter to control
the rig. Kits include all connectors needed for
connection to Kenwood, Yaesu or Icom rigs and as
well as others.

Check it out ...

http://www.gcr1.com/n5gpi/

73,
N5GPI


From [e-mail] Sun Apr 14 17:44:54 1996
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Silver plating PCB
Date: Tue, 09 Apr 96 17:09:23 GMT
Message-ID: <4ke5i8$[e-mail]>
References: <[e-mail]>

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

>The objective is to reduce losses and improve overall efficiency in
>VHF/UHF RF circuits. As I understand it the silver layer should reduce
>losses by providing a better (than copper) conductor for the 'skin
>effect' currents at these frequencies. I assume that this is why silver
>plated wire is recomended in these RF circuits. Obviously gold would
>provide an even better conductor but my finances do not run to providing
>gold plating services for one off type runs. I suspect also that a
>permit would be required here in the UK for such activities.
>Would not the problems of surface corrosion etc be reduced or even
>eliminated by the use of a non-conductive varnish?
>Pete Mcquail, G8DCJ

The difference between the conductivity of copper and silver isn't large,
and it's less at radio frequencies due to skin effect. (The skin depth in
copper is greater than in silver, reducing the advantage.) There was quite
a discussion here recently about silver-plating cavities which addressed
this in detail.

When you have a conductor over a ground plane, e.g., microstrip
construction, nearly all the current is flowing on the bottom of the
conductor and the top of the ground plane, which you won't be able to plate
anyway.

73,
Roy Lewallen, W7EL


From [e-mail] Sun Apr 14 17:44:55 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Site for AM homebrewers
Date: Sat, 13 Apr 1996 02:50:29 GMT
Message-ID: <[e-mail]>

http://hamradio.bicnet.com is a site to check out for homebrewing.
Chuck WA1IIE



From [e-mail] Sun Apr 14 17:44:55 1996
From: [e-mail] (KN5S)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Six Meter Transceiver
Date: 9 Apr 1996 02:57:20 -0400
Message-ID: <4kd1og$[e-mail]>
References: <[e-mail]>

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

>where I can get a reprint?

You'll probably be able to get a back issue of QEX from ARRL.
Their phone numbers and e-mail addresses are in QST.

Good luck with the project.  Hope to work you on 6.

73,   Mark    KN5S     DM62

73,  Mark  KN5S     [Mark  Mandelkern,  Las Cruces,  NM]


From [e-mail] Sun Apr 14 17:44:56 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Six Meter Transceiver
Date: Thu, 11 Apr 96 07:48:12 PDT
Message-ID: <[e-mail]>
References: <[e-mail]>



> a 6 meter transceiver had been described in the Sept. 1995 issue
> of QEX. The author of the article was Zack Lau.
>

> Does anyone know where I can get a reprint? Is it in the 1996
> ARRL Handbook (which I plan to purchase)?


I haven't seen it, but ARRL is selling a CD Rom that is supposed to
contain the entire contents of the QST, QEX, and (I think a contest
journal) for the year.  I believe that the price is $19.95.  Sounds
like a good way to archive the year, without taking up a whole
bookshelf.

73....de KI7RH (Jay)



From [e-mail] Sun Apr 14 17:44:57 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source for parts
Date: Wed, 10 Apr 96 07:04:55 GMT
Message-ID: <4kfu3g$[e-mail]>
References: <[e-mail]>

   [e-mail] wrote:

>I saw something about this place a while back on ham-homebrew but had
>no opportunity to get there until last Friday.
>
>The place is City Electronics in Bellaire (Houston).  He is,
>unfortunately, only open 9 to 5 Mon-Fri.  He has a phone
>(713-663-6066) and does MC/Visa and shipping.
>
>He has fun stuff like high wattage pots and tube sockets.

City Electronics is a great source for all kinds of parts and its one
of the things I miss most about Houston.  Next time you're in, tell
Alex that Jack from SST said hello.  He'll know who you mean.

73,
Jack  WB3U


From [e-mail] Sun Apr 14 17:44:58 1996
From: [e-mail] (Ian Morrison)
Newsgroups: rec.radio.amateur.homebrew
Subject: Sub
Date: 11 Apr 96 16:49:07 GMT
Message-ID: <[e-mail]>

subscribe [e-mail] ham-homebrew



From [e-mail] Sun Apr 14 17:44:59 1996
From: [e-mail] (Rick)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Ten-Tec 1209 transverter kit: comments?
Date: Wed, 10 Apr 1996 02:56:22 GMT
Message-ID: <4kfc9v$[e-mail]>
References: <4j8v9u$[e-mail]> <4je7ud$[e-mail]>



>

>       I received my 1209 2m - 6m transverter kit last week, but have

What other new kits have they announced?  I hadn't heard about the
2m to 6m kit?

Rick  KT2Q



From [e-mail] Sun Apr 14 17:45:00 1996
From: [e-mail] (Jeff Gold)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Ten-Tec 1209 transverter kit: comments?
Message-ID: <[e-mail]>
Date: 12 Apr 96 08:56:57 -0500
References: <4j8v9u$[e-mail]> <4je7ud$[e-mail]> <4kfc9v$[e-mail]>

In article <4kfc9v$[e-mail]>, [e-mail]
t.net (Rick) writes:
>>
>
>>      I received my 1209 2m - 6m transverter kit last week, but have
>
> What other new kits have they announced?  I hadn't heard about the
> 2m to 6m kit?
>
> Rick  KT2Q

I am completing a review of the 2 meter kit. The basic kit is $200
and an extra $50 I believe for the 35 watt amplifier module which
fits on a large heat sink that attaches to the back of the rig.

The finished rig won't have all the bells and whistles of a mobile
2 meter rig.. no scanning, and right now no DTMF mike to go with
it.. but it has internal provisions for tones and packet and they
are looking to put a matching mike or mike kit out for it.

The rig does have 15 memories, is small and looks very
professional (not like a kit) when completed.. does the offset and
non-standard offset.

The rig is built in sections and you test each section and get it
functional before proceeding.. I love this approach. The quality
of all parts is excellent.. the manual is excellent. the original
had a couple of minor errors, only one that would cause you
desoldering problems.. but they have already done an addendum that
caught all the problems I came across.. the Faxed it to me. The
support is excellent.. if you run into a problem,  you can talk to
someone I believe who designed it.. but at least he knows about
everything there is to know about the rig.

You only need a standard meter for most of the alignment. I found
the alignment process for all sections extremely easy.

I loved building the kit.. it works great and the enjoyment I had
building it justified its cost.

73
Jeff


From [e-mail] Sun Apr 14 17:45:01 1996
From: Steve Clements <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Thanks
Date: Wed, 10 Apr 1996 21:06:30 GMT
Message-ID: <[e-mail]>

hi,

Thanks to Moritz DL5UH for your reply.

I have now a design set using a very similar MMIC, for masthead amps.

Thanks also to K2?? for your reply. Sorry for not remembering your call
better, or your name, but your mail is safely stored away on my HD.

Trouble is I have just changed computers, and the HD wont work on this
one, and the other is dismantled :-(

Yes please, I would like the photocopies if OK by you.

73 Steve G1YBB
-
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 STEVE CLEMENTS (radio : G1YBB @ GB7MAD.#24.GBR.EU)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


From [e-mail] Sun Apr 14 17:45:02 1996
From: <.,@compuserve.com>
Newsgroups: rec.radio.amateur.homebrew
Subject: Uniden 2510 / 2830
Date: 12 Apr 1996 21:49:17 GMT
Message-ID: <4kmj4u$[e-mail]>
Keywords: Mods for Uniden needed


Hi all, I have a President Lincon which is also called the Uniden 2510 and 283
0 plus a few other numbers, I am looking for any mods for the radio. I look fo
rward to your replys.


From [e-mail] Sun Apr 14 17:45:02 1996
From: [e-mail] (Christer Johansson)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Wrong URL to L.O.S.A List !
Date: Wed, 10 Apr 1996 16:31:49 GMT
Reply-To: [e-mail]
Message-ID: <[e-mail]>

Hi,

I'm sorry to bother you but thanks to Dave Fritsche who pointed
out an typo in the L.O.S.A address given in the list.

The correct URL is...

  http://www.hth.com/losa.htm

and NOT...

  http://www.hth.com/losa.html
                          ^^^^

Regards,

/Christer

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon  -  Christer Johansson  -  E-mail: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
     >>  World Wide Web On-Line Catalog - http://www.hth.com  <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Sun Apr 14 17:45:04 1996
From: Gerald Caouette <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.cb
Subject: Re: YAESU FT-200 Help?
Date: Sat, 13 Apr 1996 10:07:50 -0700
Message-ID: <[e-mail]>
References: <4kb3r1$neu$[e-mail]>

George Harris wrote:
>
> Hi Everyone,
> My Friend has an Yaesu Ft-200 Radio and is looking for a
> possible modification to include 11 meter capability. Does anyone
> know of such a modification. All answers are appreciated.


George

You mean recieve only " RIGHT "

Would not want your "FRIEND" to go astray of the law, eh!


Although the licence requirements for the 11 M bands are
very lax, there is one thing that the law requires and that
is the transmissions are below very specific power levels and
on assigned frequencies. Failing to comply may bring a complaint
and then the respective departments in the government react
swiftly , and  harshly. It can be very expensive and in some
cases accomodation is provided by the state for various periods.

I believe I have seen your posts on other matters in the past,
that have raised some disscussion. Perhaps take the time and
read the regulations and laws set out by your government and
the international agreements that make the world of radio
communications possible..


If you don't have the technical skills to know how to modify the
radio, I doubt if you would have the skill to ensure that you
could meet and maintain, all the requirements to have the radio
type accepted for use in the 11 M  band....

There is nothing wrong in learning how, but I would suggest you
limit the mod to recieve only.

If your are serious about learning how the FT200 works and
require manuals and schematics, I can provide you with a
photo copy.


GERALD G. CAOUETTE
[e-mail]


From [e-mail] Thu Apr 18 15:21:01 1996
From: [e-mail] (Russ Renaud)
Newsgroups: rec.radio.amateur.homebrew
Subject: BFR-91 equivilant
Date: 12 Apr 1996 14:37:01 GMT
Message-ID: <4klpqd$[e-mail]>
Reply-To: [e-mail] (Russ Renaud)

Could someone tell me what what be an equivilant to a BFR-91?

I can order them locally thru Active, but it's a $25.00 minimum.

tnx


From [e-mail] Thu Apr 18 15:21:02 1996
From: [e-mail] (Barbara Fehner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Controlled Carrier AM (was Re: Transmitting tubes!)
Date: Mon, 15 Apr 1996 19:46:02 GMT
Message-ID: <[e-mail]>
References: <4jlao4$[e-mail]> <4jmdbu$[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]

This system was developed in 1950 by Bob Carter and was called Carter
modulation. He developed it for mobile use in the days of 6V. car
batteries and dynamotors inorder to reduce power consumption. A switch
controlled the screen grid clamping voltage allowing either controlled
carrier or normal screen grid modulation. I used the system with an
ARC5 transmitter in the early 50's and it worked great with just a
little non-linearity in the modulation.

Barbara  KK6IB
E-Mail: [e-mail]


___________________________________________________________________
[e-mail] (David Feldman) wrote:

>In article <[e-mail]> Monty Wilson <mwilson@banga
te.compaq.com> writes:
>>[e-mail] (Nan Gwa) wrote:
>>>My venerable old 1973 ARRL Handbook, in a section entitled "A Sweep
>
>>My dad's Drake TR-3 transceiver uses three sweep tubes in parallel,
>>and it does use them on AM, but they pulled a trick to keep the
>>duty cycle down.  They suppressed the carrier and screen-grid-
>>modulated the tubes so your wattmeter looks like you're talking on
>>sideband, but when the sidebands are present the carrier is also,
>>making it possible to copy you on an AM receiver.  Of course, a
>>REAL AMer would tell you you don't sound too good...
>
>Drake calls this "controlled carrier AM". I think what's really happening
>is that the carrier level into the finals tracks the modulation envelope,
>so when the signal is only lightly modulated (i.e., less power into the
>sidebands), the carrier level is reduced accordingly, so that the carrier-
>to-peak-modulation-power level is held more in line. It definately gives
>you lower average plate dissipation (unless you're also using audio
>compression) and it is still audiable on a regular AM receiver (altho the
>RF-derived "S" meter on an old style AM receiver will now move at a syllabic
>rate, rather than hold steady). It's kind of an interesting scheme and the
>only drawback I can see is that the receiving end might perceive a lower
>signal/noise ratio during periods of low modulation.
>
>No other HF transceiver (even modern solid state ones) seem to work this way.
>
>73 Dave WB0GAZ [e-mail]
>



From [e-mail] Thu Apr 18 15:21:04 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Matt Roberts)
Subject: CTCSS decode with DSP??
Message-ID: <[e-mail]>
Date: Sun, 14 Apr 96 19:30:55 GMT

Hi!

I'm working on an amateur project with DSP, in which a part will be to decode
a PL tone from
receiver audio.  At this point I am inclined to use a phase-locked loop emulat
ed by software.
Has anyone worked with this type of project before, perhaps something similar
used for
DTMF?  I'd like to hear from you!
----
Matt Roberts, KK5JY,
[e-mail]





From [e-mail] Thu Apr 18 15:21:05 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Do I need new Glasses?
Date: 16 Apr 96 21:57:17 GMT
Message-ID: <[e-mail]>

___________________________________________________________________
Tom wrote:

From: [e-mail] (W8JI  Tom)
Subject: New Svetlana Trasmitting tubes

<snip>
The recent QST piece about the 811A that shamelessly plugged the
"4CX1600"
should have been a paid advertisement, not a QST article.
<snip>
________________________________________________________________



Tom:
        Maybe I need new glasses but I saw about 15 3-???, 3CX????,
88??, and others made by Eimac mentioned as well as the 811 and 812
made by RCA and others.  There is a reproduction of a full page RCA ad
from years ago in the article.  There were also mentions of Collins,
Heath, Hallicrafters, Henry, and Drake.  Oddly enough I see Svetalana
mentioned *once* generically and Russia mentioned *once* generically.

There was not ONE SINGLE mention of a specific tetrode ANYWHERE in the
article.

Maybe you read a different article?

The only direct reference to Svetlana as a tube manufacturer was the
first footnote that said you could get data sheets for most of the
tubes mentioned from Svetlana, *even if you happen to be using Eimac
tubes* (emphasis mine).

If anything the article was an Eimac ad!

All in all I thought it was a very well written *historical* piece.

I am not sure why the mood has changed but I see a lot of bashing of
QST and QEX here that disturbs me.  Come on folks, the staff in
Newington are folks a whole lot like you and me.  They are doing the
best they can to produce a quality product just like I am sure you do
for your employer (but then maybe not ;<).  They sometimes make errors
in judgement or fall short of the mark.  I'm sure glad you and I never
do ;<).

At the very least if we have a gripe let's get the facts straight!
Especially if we air the gripes in public.


Ray Mack
WD5IFS
[e-mail]
Friendswood (Houston), TX



From [e-mail] Thu Apr 18 15:21:05 1996
From: [e-mail] (David Allen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Glass solar panel
Date: Wed, 17 Apr 1996 06:37:01 GMT
Message-ID: <4l23hc$[e-mail]>
References: <[e-mail]>





From [e-mail] Thu Apr 18 15:21:06 1996
From: [e-mail] (David Allen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Hallicrafters SX-28A
Date: Wed, 17 Apr 1996 06:36:49 GMT
Message-ID: <4l23h1$[e-mail]>

I still have my very first receiver -- an 80 pound boat anchor -- in
storage for many an moon.  Any interest?



From [e-mail] Thu Apr 18 15:21:08 1996
From: [e-mail] (RUSS WUERTZ)
Newsgroups: rec.radio.amateur.homebrew
Subject: HAM
Message-ID: <[e-mail]>
Date: Wed, 17 Apr 96 08:39:00 -0500
Distribution: world
Reply-To: [e-mail] (RUSS WUERTZ)

Date: 10-12-95 (18:45)              Number: 13348 of 13367 (Refer# NONE)
  To: All
From: Russ Wuertz
Subj: ELF RECIEVING SYSTEM
Read: NO                            Status: PUBLIC MESSAGE (Echo)
Conf: Shortwave (35)             Read Type: TEXT SCAN (+)


     For the interested party in E.L.F.:

An ELF recieving system, like what Congress is using on C-Span (I guess?)
can be had from Panaxis Productions assembled for 79.00 .   Its the L500

There is also an Ethereal Plane Monitor that can be had for 32.00 dollars
assembled.   It is the EPM.   It recieve that annoying VLF that are
"voices" that the police department seem to be broadcasting.  (That also could
be repeating your thoughts)    They refer to it in the catalog as "whistlers"
and the "dawn chorus".    For me, they use the voice of a little girl that the
locals named, "the girl with the desperate voice."

For better Quality VLF sound listening and possible recording, you can get]
the L700 for 109.00 bucks.

     They seem to be legal and are sold in Paradise, CA.  [phone]

There is also a micro-harminizer that costs 119.00 bucks that broadcasts
hormonics of 7.83 Hz that will block your thoughts from being stolen.
1-800-456-9887.

    If anyone else has any devices that are in this field, please let me know.
There are people being terrorized right now and are in hospitals because of it
.

--- FLAME v1.1
 * Origin: Techtalk BBS, Cocoa, FL 407-635-8833 (1:374/1)

<<<>>>


From [e-mail] Thu Apr 18 15:21:09 1996
From: Norm Hammar <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HF Xmtr plans
Date: Mon, 15 Apr 1996 06:51:29 -0600
Message-ID: <[e-mail]>

Has anyone recently built an HF transmitter (50-100 watts) that you
would be willing to share the instructions? Looking for a project for my
son and me to build...and this is what he selected. We would need
insructions, parts list and suppliers, and schematics. Thanks
[e-mail]


From [e-mail] Thu Apr 18 15:21:09 1996
From: [e-mail] (steve eizenberg)
Newsgroups: rec.radio.amateur.homebrew
Subject: re: high scan composet video to slow scan tv
Date: Thu, 11 Apr 1996 12:20:22 GMT
Message-ID: <4kij5v$[e-mail]>

i am looking for a shairware prog and a schematic for a smpile
interface that will convert the high scan composet video from my video
camera to slow scan tv. does anyone have anything like that?



steve kc7byp



From [e-mail] Thu Apr 18 15:21:10 1996
From: [e-mail] (Dave Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Homebrew
Date: 14 Apr 1996 19:24:29 GMT
Message-ID: <4krjdd$[e-mail]>

Anybody doing any homebrew stuff on 2m these days?




From [e-mail] Thu Apr 18 15:21:11 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Homebrew
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4krjdd$[e-mail]>
Date: Mon, 15 Apr 1996 15:44:49 GMT

In article <4krjdd$[e-mail]> [e-mail] (Dave Stewart) writ
es:
>Anybody doing any homebrew stuff on 2m these days?

I built a HT based on the MC2833 and MC13135 FM transmitter and
receiver subsystems. Ugly minibox construction, but it works.
And I converted a surplus airways 1 kW AM transmitter to be a
1 kW 2m FM amplifier. Kind of dwarfs the rest of the HT, however.

Gary

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


From [e-mail] Thu Apr 18 15:21:12 1996
From: [e-mail] (KN5S)
Newsgroups: rec.radio.amateur.homebrew
Subject: Homebrew?
Date: 12 Apr 1996 04:31:51 -0400
Message-ID: <4kl4dn$[e-mail]>
References: <4kjmvv$[e-mail]>

I am in the process of switching internet connections, so for a few days I
receive this newsgroup on both AOL and Netscape.

The strange thing is, that the messages I receive are different.  Some
arrive only via one connection, some via the other, and some on both, but
often at very different times, sometimes a day apart.

Can anyone explain this?



73,  Mark  KN5S     [Mark  Mandelkern,  Las Cruces,  NM]


From [e-mail] Thu Apr 18 15:21:13 1996
From: Greg Lohstroh <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Micronauts
Date: Sun, 14 Apr 1996 17:42:11 -0400
Message-ID: <[e-mail]>

 I read an article in April 96 Issue of CQ about a low power transmitter
that they call the "Micronaut" I'm looking for the coil form for L2,it's
a T-50-2 core,can this be improvised? where would I order one? I checked
Mouser,Newark...no luck,any help would be appreciated!
         Thanks.



From [e-mail] Thu Apr 18 15:21:14 1996
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Hp-8410A and 8411
Date: 14 Apr 1996 09:51:28 -0400
Message-ID: <4kqvt0$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)



Need 8410A and 8411. Other options like 8414 and 8741 will be considered.
Thnks beforehand.
Vince


From [e-mail] Thu Apr 18 15:21:14 1996
From: qwick@???????.com (Qwick)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need schematics for Linear Amp. (600 watt)
Date: Sat, 13 Apr 1996 23:52:12 GMT
Message-ID: <4kp7du$[e-mail]>
References: <4kmv9k$[e-mail]>

Dave Perkins <[e-mail]> wrote:

>  Me and my step-dad want to build a linear amp but we need to know what
>parts to get and schematics on it...If anyone has any of the above or
>maybe and article from QST on how to build one, please let me know..
>
>  Please email me (I rarely check the newsgroups)
>  Any help would be greatful

>  Thanx again
>  Dave

I'm a Computer Enginering major and for a project, I'd like to build a
CB linear.  Thus...
I'd like the same info if possible...  [e-mail]
Thanks



From [e-mail] Thu Apr 18 15:21:16 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need schematics for Linear Amp. (600 watt)
Message-ID: <[e-mail]>
Date: Sun, 14 Apr 96 12:45:47 PDT
References: <4kp7du$[e-mail]>
Reply-To: [e-mail]
Distribution: world

qwick@???????.com (Qwick) writes:

> I'm a Computer Enginering major and for a project, I'd like to build a
> CB linear.  Thus...
> I'd like the same info if possible...  [e-mail]
> Thanks
>

CB linears are certainly illegal to use in the USA and Canada, so it's
unlikely anyone here is going to tell you how to break the law.

On the other hand, amateur radio operators may build all sorts of
amplifying equipment and use it quite legally in the amateur bands.
May I encourage you to visit a local ham club and see how easy it would
be to get a license to do this sort of thing first?

73, Bob VE7HS



[e-mail]                             __|
Robert Smits                                _/. |\
(VE7HS)                CQ CQ CQ !!!        <   (0)
                                       _   /__    |
                                      ( ) <_______/
                                       \ \/       \__


From [e-mail] Thu Apr 18 15:21:17 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: New Svetlana Trasmitting tubes
Date: 15 Apr 1996 08:27:59 -0400
Message-ID: <4ktfcf$[e-mail]>
References: <4ksoea$[e-mail]>

In article <4ksoea$[e-mail]>, [e-mail] (Donald E.
Turner) writes:

>I'm considering the construction of a new linear amp using
>the Svetlana 4CX1600B.  This is the Russian version of the
>original American tube.

The 4CX1600 is a unique tube made in Russia. It isn't the Russian version
of anything ever made anywhere else in the world, especially an
"origninal" American tube.

> This tube is very attractive because
>of the low drive requirements, grid driven with a passive
>input circuit.

Don't count on it being easier to use or cheaper and easier to build. The
simplest and cheapest amps to build are grounded grid triodes. It will
remain that way until someone invents a linear amplifiying device with two
terminals instead of three.

I know what you say is what recent articles about that tube say, but
remember that information comes from marketing people that **want to sell
tubes**.

The truth is this. Grid driven amplifiers faded from the amateur market
because they are much more costly and difficult to build. Grid driven
amplifiers are more difficult to tune, and generally less compatable with
the drive power of amateur exciters. They require expensive regulated and
protected screen supplies, and constant attention to screen current and
output tuning. None of that has changed, despite what marketing people
would have us believe. Right now I'm corresponding with two amateurs who
have built 4CX1600 amps, and are having a real time getting them going.

The recent QST piece about the 811A that shamelessly plugged the "4CX1600"
should have been a paid advertisement, not a QST article.

> The question is, does anyone have experience
>with the Svetlana transmitting tubes, and more specifically
>with this one.  I'm using their 6550C's in an audio amp,
>and they are great. Leave email if you have information.

I understand Svetlana tubes are OK, my only concern is they are being
touted as an "easy and inexpensive improvement over grounded grid". In
today's world I guess that isn't so bad. In advertising, one out of three
is pretty good. They certainly are inexpensive.

73 Tom


From [e-mail] Thu Apr 18 15:21:18 1996
From: [e-mail] (Alan Bloom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NorCal QRP Cascade
Date: 9 Apr 1996 19:25:24 GMT
Message-ID: <4kedj4$[e-mail]>
References: <[e-mail]>

[e-mail] wrote:

: Home brew crew,
: I would like to build the NorCal QRP club's nifty 75m/20m SSB rig.  Problem
is
: I can't get to the NorCal web page right now and I need to get purchase
: details on my birthday wish list right away.  (XYL shopping plans imminent!)
: Anyone know how much it is and where to get it?  Please respond ASAP.
: Thx all!
: 73 de KB2TCG
: [e-mail]

For info about the NorCal QRP club, write to

     Jim Gates
     3241 Eastwood Rd.
     Sacramento, CA 95821

AL N1AL



From [e-mail] Thu Apr 18 15:21:19 1996
From: [e-mail] (Jay Huldeen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Powerless communication?
Date: 13 Apr 1996 22:02:57 GMT
Message-ID: <4kp8ah$[e-mail]>
References: <4kkpka$[e-mail]>

Carl Steen ([e-mail]) wrote:

: Brings up a related point.  Aren't there some simple ways
: to make batteries out of acidic fruit or potatoes or
: saltwater, etc.?

: carl steen

I vaguely recall making such a battery in 5th or 6th grade, and I think
it involved nickels, a potato and lemon juice, but the details are gone
now.  I remember being amazed though!

--
Jay Huldeen
[e-mail]


From [e-mail] Thu Apr 18 15:21:20 1996
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Powerless communication?
Date: 14 Apr 1996 20:58:45 GMT
Message-ID: <4krou5$[e-mail]>
References: <[e-mail]> <[e-mail]>

In article <[e-mail]>, [e-mail] says..
.
>
>In article <[e-mail]> Christophe
r
Comeaux <[e-mail]> writes:
>> I am wondering about the feasibility of the following scenario: A
>>person gets his boat wrecked on an uninhabited island nearby Hawaii.
>>He has no electricity, but lots of wire from his smashed up boat.
>>He uses it to make a directional antenna that is pointed toward

stuff deleted...

>>have the slimmest chance of getting the person rescued; or can anyone
>>think of another possible example of "powerless communication"?
>>
>>CC/Impulse/N2QMU
>
>I don't think it would have a prayer of working. The passive antenna
>would reradiate too little signal to have a noticable effect on an
>FM receiver at a distant location. Remember that the FM receiver
>has a limiter that saturates on the desired signal so your very
>tiny reradiated signal would be swamped. Only if you could introduce
>enough signal to generate significant multipath would there be detectable

more stuff deleted...
>
>In the latter vein, if all you can generate is a very weak signal,
>put it where it'll be the most annoying, where the weakest signals
>are received. In that regard, be aware of what frequencies radio
>astronomers monitor.
>
>Gary
>--
>Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
>Destructive Testing Systems |    we break it.     | with previous uucp addres
ses
>534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
>Lawrenceville, GA 30244     |                     |


In this latter vein, I'd always heard the way to get the fastest notice
from the FCC (put another way, to be the most annoying) was to put out a
signal on the aviation distress channels.

That way you have _two_ government agencies, neither one known for their
excellent sense of humor, trying to find you and make you stop.  Might be
just the thing if you were shipwrecked.



--
Bob Lombardi            WB4EHS in Melbourne, FL          o        \---\---\
[e-mail]    or   [e-mail]        /\            |
Telescope making, optics, astronomy, piano, bicycling  -\ 7   & radio |
I've run out of things I can say in 4 lines.         (*)/(*)          |



From [e-mail] Thu Apr 18 15:21:21 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Zac)
Subject: Re: Powerless communication?
Message-ID: <[e-mail]>
Reply-To: [e-mail]
References: <[e-mail]>
Date: Wed, 17 Apr 1996 05:45:28 GMT

I suppose one could make a big loop antenna which is resonant with WWVH
or whatever transmits the most power in the area and rectify that for a
source of power. The trouble is how would you know if it is tuned
correctly?

If you get tired of trying to figure it out, you can go play with
Ginger and Mary-Anne for a while....

Heckuva deal!


---
Zachrey Helmberger
Amplifier Design Engineer       408-721-6020 [e-mail]
National Semiconductor Corporation
Data sheets at http://www.national.com/    my opinions are MINE!



From [e-mail] Thu Apr 18 15:21:23 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Press-n-Peel and Scratched Copper
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]>
Date: Mon, 15 Apr 1996 16:35:35 GMT

In article <[e-mail]> [e-mail] (David Shalita
) writes:
>
>Just before heating the Press-n-Peel film , I preheat the bare clean
>unetched copper board by laying the hot iron bottom directly onto thecopper
>surface. Immediately, scratches appear. The clothes iron surface seems to
>scratch the new copper. These are fine scratches and not deep. But, after
>placing the Press-N-Peels film on the hot board, and ironing, the deep
>circular scores and scratches appear on the unetched copper and can be seen
>in the toner  patterns.
>
>Is anyone else seeing these deep scratches?
>How do I avoid these scratches?

Didn't your mother teach you how to iron "delicate" things?

Don't ever ever touch the hot iron directly to the copper or to
the transfer sheet. *Always* use a cover cloth. Old cotton Tee
shirt material works fine, or well worn flannel shirt material
will work too. Use *lots* of pressure, but don't get too vigorous
with iron motion. Just move it enough to get even heat transfer
across the pattern. It you scorch the cotton, you left the iron
down too long.

I usually preheat my boards under a heat lamp. Remember the
board has to be perfectly clean and oxide free. Don't overheat
it or leave it heating too long or fresh oxide will form and
mess up your transfer. The copper always has tiny scratches
in it, it is the overheating that is highlighting them due to
oxide formation.

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


From [e-mail] Thu Apr 18 15:21:23 1996
From: [e-mail] (Robert Crable)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Press-n-Peel and Scratched Copper
Date: 15 Apr 1996 15:24:35 GMT
Message-ID: <4ktpnj$[e-mail]>
References: <[e-mail]>


Dave,
  Have you considered your oven?  We used a plain old oven set at 400F
(200C) for years.  It is more even than a clothes iron and will not
scratch the board.  Put the board in for about 7 minutes, or until it just
starts turning purple (the oxidation will not affect the toner adhesion),
then remove it and place the pattern on the board and use a rolling pin to
roll it down.  Works great.
  For cleaning the board, we use a Scotch Brite green pad and Comet
cleanser, followed by a water rinse, then an acetone rinse.  Can't say
we've ever seen the scratch marks you refer to.
  Good luck.
  Bob Crable
  Engineering Aide
  Research Instruments
  Electronics Shop
  Chemistry Department
  The Pennsylvania State University



From [e-mail] Thu Apr 18 15:21:24 1996
From: "miker in Tigard, OR." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Professional looking front panels - how?
Date: 15 Apr 1996 19:25:14 GMT
Message-ID: <4ku7qq$[e-mail]>
References: <[e-mail]> <[e-mail]>

I've had pretty good luck designing front panels using AutoCad and plotting di
rectly
on the aluminum panel.
miker



From [e-mail] Thu Apr 18 15:21:25 1996
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Question: Having Circuit boards made: Where?
Date: 15 Apr 1996 21:01:00 -0400
Message-ID: <4kurgc$[e-mail]>
Reply-To: [e-mail] (PFZouave)

Does anyone have a favorite circuit board house or fabricator that they
like to use to produce small qty boards for prototypes? Can anyone
recommend a cheap but functional software package to do the CAD work?
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Thu Apr 18 15:21:26 1996
From: [e-mail] (Art Blair)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Questions about SAW devices
Date: 16 Apr 1996 02:38:40 GMT
Message-ID: <4kv17g$[e-mail]>
References: <4kjuq5$[e-mail]>

Kelly McArthur ([e-mail]) wrote:
: I just read an article that briefly described the use of SAW (Surface Acoust
ic Wave)
: devices in simple, low-cost RF transmitters.  Apparently, they are available
 both
: as filters and resonators, for frequencies in the hundreds of MHz.

: I'm interested in short-range RF data transmission via simple, inexpensive l
inks,
: and these seem like they might be a good alternative to the LC circuit's sta
bility
: problems, or the complexity of crystals with frequency triplers, etc.  I was

: also wondering if the SAW resonators are pullable, for FM or FSK transmissio
n
: schemes?

: If anyone can help with info on Manufacturers and Data Sheets, Distributors
and
: Application Information, I would be very interested.  Thanks!

Manufacturers include Sawtek & Phonon. I'm not familiar with the term "pullabl
e"
but if it involves changing the characteristics of the filter by electrical
control, the answer is no. Advantages include size and STEEP skirts.
Disadvantages include lots of loss and so-called "triple transient" distortion
(signal bounces around in the device yielding more pulses out than you put
in, for instance.)
Art.


From [e-mail] Thu Apr 18 15:21:28 1996
From: [e-mail] (Sean Edward Dunn)
Newsgroups: rec.radio.amateur.homebrew
Subject: radio homing devices..help!
Date: 15 Apr 1996 21:35:37 GMT
Message-ID: <4kuff9$[e-mail]>

I'm planning the design of homing device, or "bug" to track the movement
of a transmitter across about a square mile area.  I'm planning on using
some kind of triangulation system, and once the relative signal strength
is known from each tracking antenna, these radial distance values need to
be fed into a computer through an a/d converter.  The transmitter also has
to have some kind of long-lasting, or regenerating power supply.  The
problem is, I don't know where to start, and I've only had a little
experience in electronic theory (enough to understand what's going on and
to build the device).

What I'm looking for are webpages, books, and personal advice on the
design of this device.  Any help would be GREATLY appreciated.

Sean Dunn
Worcester Polytechnic Institute

--
          ==========================================================
          | Sean Dunn                  |        (This space        |
          | [e-mail]            |       intentionally       |
          | http://cs.wpi.edu/~skacore |        left blank)        |
          ==========================================================


From [e-mail] Thu Apr 18 15:21:28 1996
From: [e-mail] (Jim Barry)
Newsgroups: rec.radio.amateur.homebrew
Subject: RF modules for telemetry application
Date: Tue, 16 Apr 1996 16:17:38 GMT
Message-ID: <4l0h5d$[e-mail]>

I am looking for sources for small inexpensive RF modules, seperate tx
and rx would be OK, for a telemetry application.  Would prefer 470 or
800-900mhz.  With the all the consumer rf devices on the market now,
900 mhz telephones and stereo headphones, there must be several
suorces for "building block" modules.

Any help on locating information and sources will be appreciated!

Jim  WA0AXB

[e-mail]




From [e-mail] Thu Apr 18 15:21:29 1996
From: [e-mail] (Tony Salvador)
Newsgroups: rec.radio.amateur.homebrew
Subject: RS-232 to TTL Rig Control ...
Date: Wed, 17 Apr 96 13:29:36 GMT
Distribution: world
Message-ID: <4l2rs9$[e-mail]>

If you are thinking about using you PC to control
you ham rig check out my page and the FT-736R CAT
section. The unit shown is usable on all rigs that
require a RS-232 to TTL level converter to control
the rig. Kits include all connectors needed for
connection to Kenwood, Yaesu or Icom rigs and as
well as others.

Check it out ...

http://www.gcr1.com/n5gpi/

73,
N5GPI


From [e-mail] Thu Apr 18 15:21:31 1996
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: schematics for VHF amp using 2c39 /
Date: 15 Apr 96 20:52:00 GMT
Message-ID: <[e-mail]>


hello peter,

i saw your request for 2m amps using 4cx250/2c39, here some facts:

Do not overstress price and construction needs of transistor and tubes. The
things depend on the power level you start with and you want to reach.

for 1-25w input i would say a power module as they are produced by
mitsubishi and others is the easiest way to reach 100w (and if you couple
two of them even 200w). also the price is not too much.

this is because you did not consider the power supply needed...

First, for the 2c39 you will need a 1000V-1200V supply. biasing is easy as
it can be done by a simple zener diode, or better with an adjustable one.
maximum output power with a single tube is about 100W-150W.

Second, for the 4cx250 it gets more complicated. first you will need
2000V-2500V anode supply, stabilized 350V for the screen grid and -100V
(switchable to adjustable -55V) for the control grid. So this is a
complicated triple power supply.

Third, you must think about the cabinet and mechanics. Transistors are
mostly easy as they can be assembled to a PCB and are ready to go after
that. Tubes always need metal cabinets which are not easy to make without
tools.

I am very shure about what I tell you. I use a homemade 2*4CX250 on 70cm, a
2*2*2C39 on 23cm and currently I build a GS35B amplifier for 2m.

vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
                [e-mail]            (Internet)
                http://www.scn.de/~koellner (WWW)


From [e-mail] Thu Apr 18 15:21:32 1996
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solar Cells Efficiency?
Date: 15 Apr 1996 21:01:05 -0400
Message-ID: <4kurgh$[e-mail]>
References: <4kul5q$[e-mail]>
Reply-To: [e-mail] (PFZouave)

From what I've read, the single most important factor in maximizing the
output of your solar supply, whatever its fabrication technology,  is
*tracking*. If I remember the figure correctly, a panel that is set up to
track the sun over the course of the day is supposed to produce 40% more
electricity than an equivalent south-facing fixed panel.
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Thu Apr 18 15:21:33 1996
From: [e-mail] (Mark Downing)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Ten-Tec 1209 transverter kit: comments?
Date: 15 Apr 1996 22:19:52 GMT
Message-ID: <4kui28$[e-mail]>
References: <4j8v9u$[e-mail]> <4je7ud$[e-mail]> <4kfc9v$[e-mail]>

Rick ([e-mail]) wrote:


: What other new kits have they announced?  I hadn't heard about the
: 2m to 6m kit?

I called today, and found out that my 20m->6m kit shipped last week.

73 de AC6PN
--Mark


--
Mark A. Downing                       Relational Data Systems
Phone:[phone]              30 Executive Park, Suite 260
Internet: [e-mail]              Irvine, CA 92714


From [e-mail] Thu Apr 18 15:21:34 1996
From: [e-mail] (Dave)
Newsgroups: rec.radio.amateur.homebrew
Subject: WEFAX/RTTY interface....
Date: 15 Apr 1996 17:43:32 GMT
Message-ID: <4ku1s4$[e-mail]>

Good afternoon all,

    I am currently looking to purchase (not construct) an interface for runnin
g HAMCOM or JVFAX
If anyone has one lying around the SHACK and would wish to part with it, pleas
e let
me know.....

73'S

JEFF


From [e-mail] Tue Apr 23 07:50:14 1996
From: Eric Howell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 8877 (3CX1500A7)
Date: Fri, 19 Apr 1996 21:59:08 -0700
Message-ID: <[e-mail]>

For you serious home brewers (up to 250Mhz)

I have a few EIMAC 8877 (3CX1500) tubes available. They are pulls and
have been tested good....

If you are interested, drop me a line.

Eric - WB8VTK/4
[e-mail]



From [e-mail] Tue Apr 23 07:50:15 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ?RF PROBE RECOMMENDATIONS?
Date: 18 Apr 1996 18:01:00 GMT
Message-ID: <4l600s$[e-mail]>
References: <[e-mail]>

Jay Wicklund ([e-mail]) wrote:


(Writing about RF diode detector probes...)
: I bought a similar probe from HP, and it is certainly a useful tool,
: but not the same as a good RF voltmeter or RF Power meter.  I played
: with the HP probe and a calibrated signal generator; and at 20MHz
: accuracy falls off fast for signal levels below 100 or 200mV.

There's an article in the Dec.  1995 "HP Journal" about "zero bias
detector diodes."  There are also some ap notes in the HP
"Communications Components" catalog about diode RF detectors.  It turns
out that if you operate them into an appropriate load impedance
(generally up near 1 megohm), the output _voltage_ is very nearly linear
with input _power_ (as measured in a 50 ohm load) up to 10's of
millivolts, and above the couple hundred millivolt level, they act as
peak detectors.  When I first started playing with a simple diode
detector for close-in fox hunting work, I was amazed to find that I
could detect RF down to a couple hundred microvolts.  That makes it
useful up to a few hundred feet from the hidden fox transmitter in many
cases.

--
Cheers,
Tom
[e-mail]


From [e-mail] Tue Apr 23 07:50:17 1996
From: [e-mail] (DARRYL LINKOW)
Newsgroups: rec.radio.amateur.homebrew
Subject: ADMS-1B Webpage wanted
Message-ID: <[e-mail]>
Date: Sun, 21 Apr 96 00:57:00 -0800
Distribution: world
Reply-To: [e-mail] (DARRYL LINKOW)


Hello all and thanks for reading this.  A couple of weeks ago
someone posted the Web Page for downloading the patch files for the
latest version of the Yaesu ADMS-1B software.  If you know that
Website, please Email me or leave message here.
              73, Darryl KE6IHA

              [e-mail]

---
 * OLX 2.2 * Darryl Linkow [phone]  9 am - 5 pm PDT


From [e-mail] Tue Apr 23 07:50:18 1996
From: [e-mail] (Tony Salvador)
Newsgroups: rec.radio.amateur.homebrew
Subject: Computer Control For Your Rig !!
Date: Mon, 22 Apr 96 13:40:26 GMT
Distribution: world
Message-ID: <4lg2c6$[e-mail]>

If you are thinking about using you PC to control
you ham rig check out my page and the FT-736R CAT
section. The unit shown is usable on all rigs that
require a RS-232 to TTL level converter to control
the rig. Kits include all connectors needed for
connection to Kenwood, Yaesu or Icom rigs and as
well as others.

Check it out ...

http://www.gcr1.com/n5gpi/

73,
N5GPI


From [e-mail] Tue Apr 23 07:50:19 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Controlled Carrier AM (was Re: Transmitting tubes!)
Date: Tue, 16 Apr 96 17:28:34 GMT
Message-ID: <4l0sui$[e-mail]>
References: <4jlao4$[e-mail]> <4jmdbu$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>

   [e-mail] (Barbara Fehner) wrote:

>This system was developed in 1950 by Bob Carter and was called Carter
>modulation. He developed it for mobile use in the days of 6V. car
>batteries and dynamotors inorder to reduce power consumption. A
>switch controlled the screen grid clamping voltage allowing either
>controlled carrier or normal screen grid modulation. I used the
>system with an ARC5 transmitter in the early 50's and it worked great
>with just a little non-linearity in the modulation.

There were some solid state (homebrew) designs in the 60's or early
70's that did the same thing.  The amount of carrier varied with
modulation and would fall to zero with no audio input.

73,
Jack  WB3U


From [e-mail] Tue Apr 23 07:50:20 1996
From: [e-mail] (Peter Frenning)
Newsgroups: rec.radio.amateur.homebrew
Subject: Converting Uniden AM/SSB CB Pro 810E to 10meters????
Date: Mon, 22 Apr 1996 10:51:20 GMT
Message-ID: <4lfob9$[e-mail]>
Reply-To: [e-mail]

I have this rig in pristine condition. It is useless to me as it is, now
that I have moved to Denmark (CB is FM exclusively here)

I would like to convert it to 10 meter/28 MHz amateur band use, if
possible.

Has anyone tried this???

Schematics for the rig/mod anyone????

Regards

Peter
******************************************************************************
**
Peter Frenning, UNIX Product Mgr., Siemens-Nixdorf DK, Ph.: [phone]
Snailmail: Dybendalsvaenget 3, 2630 Taastrup, Denmark, Fax: [phone]
Email: [e-mail](...!dkuug!sni.dk!pef)(NERV: pfrenning.cph)
X400:C=DK; A=400NET; P=SCN; O=SNI; S=Frenning; G=Peter; OU1=CPH1; OU2=CC
       Private connection: [e-mail]
************  Come visit us on the web; URL http://www.sni.dk  ***************
**



From [e-mail] Tue Apr 23 07:50:21 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Mike Morris)
Subject: Re: CTCSS tone generator
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Mon, 22 Apr 1996 01:37:48 GMT

Andrew Zimmerman <[e-mail]> writes:

>Does anyone know how to make a simple CTCSS tone generator to connect to
>the audio input line of a 2M crystal rig? Is there a chip to generate
>these tones? Thank you.

>Andrew

>-------------------------------------------------------------------------
>[e-mail]      Compu$erve  73307,2755     Amateur Radio AA3AK
>-------------------------------------------------------------------------

Check out the Communications Specialists ads in QST or 73 - they've
already done the engineering for you and $50 or so for a TS-32 is pretty
cheap - and if you have problems they'll help over the phone.... or fax.


--
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).
   Looking for CDA-banned material?  Try the bible: Genesis 19:30-38


From [e-mail] Tue Apr 23 07:50:22 1996
From: [e-mail] (Stanley L. Flegler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Delrin, insulating properties?
Date: 22 Apr 1996 15:07:43 GMT
Message-ID: <4lg7bv$[e-mail]>

Does anyone know the RF insulating properties of Delrin?  Is it terrible
or comparable with other materials such Teflon, polyethylene, etc?  Any
input would be appreciated.  Stan Flegler K8RPA, [e-mail]



From [e-mail] Tue Apr 23 07:50:24 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Diff between Tx and Rx Crystals?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]> <4kblq2$[e-mail]> <4l93uu$[e-mail]>
Date: Sun, 21 Apr 1996 06:49:37 GMT

In article <4l93uu$[e-mail]> [e-mail] (M
ike McCarty) writes:
>In article <4kblq2$[e-mail]>, Tom Bruhns <[e-mail]> wrot
e:
>)Gary Coffman ([e-mail]) wrote:
>): The former is the gotcha, make sure that you know the
>): frequency on which the crystal actually oscillates. It may not be the
>): frequency stamped on the case with crystals intended to be used in
>): receivers.
>)
>)Of course, the same is true of crystals stamped with the transmitter
>)frequency:  the crystal likely will oscillate on a fraction (like 1/9 or
>)1/12) of the actual transmitter output frequency; in some cases there is
>
>[rest cut]
>
>Do you know something I don't know? I thought that overtone crystals
>only worked on odd harmonics (1,3,5,7,9,11,etc.) and that 5th overtone
>was about as high as they go (a few 7th exist, I think). Except when
>used with a frequency multiplier circuit. I didn't think that crystals
>intended for frequency multiplication were marked with the multiplied
>frequency.
>
>Mike

Yeah they often are, in fact it's almost standard practice. When
I order a 145.01 MHz channel element for a Micor, that's what's
going to be stamped on it, even though that's not the frequency
at which the crystal oscillates.

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


From [e-mail] Tue Apr 23 07:50:25 1996
From: Steve Siegel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HAM
Date: Thu, 18 Apr 1996 10:37:36 -0400
Message-ID: <[e-mail]>
References: <[e-mail]>

RUSS WUERTZ wrote:
>
> Date: 10-12-95 (18:45)              Number: 13348 of 13367 (Refer# NONE)
>   To: All
> From: Russ Wuertz
> Subj: ELF RECIEVING SYSTEM
> Read: NO                            Status: PUBLIC MESSAGE (Echo)
> Conf: Shortwave (35)             Read Type: TEXT SCAN (+)
>
>      For the interested party in E.L.F.:
>
> An ELF recieving system, like what Congress is using on C-Span (I guess?)
> can be had from Panaxis Productions assembled for 79.00 .   Its the L500
>
> There is also an Ethereal Plane Monitor that can be had for 32.00 dollars
> assembled.   It is the EPM.   It recieve that annoying VLF that are
> "voices" that the police department seem to be broadcasting.  (That also cou
ld
> be repeating your thoughts)    They refer to it in the catalog as "whistlers
"
> and the "dawn chorus".    For me, they use the voice of a little girl that t
he
> locals named, "the girl with the desperate voice."
>
> For better Quality VLF sound listening and possible recording, you can get]
> the L700 for 109.00 bucks.
>
>      They seem to be legal and are sold in Paradise, CA.  [phone]
>
> There is also a micro-harminizer that costs 119.00 bucks that broadcasts
> hormonics of 7.83 Hz that will block your thoughts from being stolen.
> 1-800-456-9887.
>
>     If anyone else has any devices that are in this field, please let me kno
w.
> There are people being terrorized right now and are in hospitals because of
it.
>
> --- FLAME v1.1
>  * Origin: Techtalk BBS, Cocoa, FL 407-635-8833 (1:374/1)
>
> <<<>>>

I'm so glad my multi-vitamin contains Lithium.
********************************
73 de N3WUU
[e-mail]
[e-mail]


From [e-mail] Tue Apr 23 07:50:26 1996
From: Tom Kreyche <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help: need altimeter device for ham balloon
Date: 18 Apr 1996 14:25:04 GMT
Distribution: world
Message-ID: <4l5jc0$[e-mail]>
References: <[e-mail]>

SenSym has a 'Solid-state Pressure Sendors Handbook' -408-954-1100
Motorola has 'Pressure sendor Device Data' DL200/D -602-244-6900

Tom KG6YJ


From [e-mail] Tue Apr 23 07:50:28 1996
Newsgroups: rec.radio.amateur.homebrew
From: "Robert W. Lewis" <[e-mail]>
Subject: Re: homemade acoustic coupler
Message-ID: <[e-mail]>
Date: Fri, 19 Apr 1996 21:40:47 -0400
References: <4kis6g$[e-mail]>

Carl Steen wrote:
>
> Is it possible to build a cheap acoustic coupler for
> computer modem use?
> My situation is I have a cell phone in a cabin with
> power but no phone lines.
>
> Since cell phones are smaller than regular phones,
> a normal acoustic coupler will not work (plus they
> are expensive).
> Would it be possible to run separate small mikes
> from each, speak and listen ends of the phone
> (each mike would be covered with some kind of
> elastic soundproofing material I guess) and
> run these two separate lines sever feet away,
> amplify them and receive these signals into
> separate corresponding ends of computer modem
> line jack?
>
> I don't think I have written this very clearly.
> The computer talks through a phone line via
> a modem and phone line jack.
> The phone line jack must have wires for sending
> and receiving audio.
> I am looking for a cheap homemade solution to
> this.
> Perhaps if I ran the two mike wires to small
> speakers which were placed on a regular sized
> phone receiver, then ran the phone jack from
> it into the computer.
>
> any comments on this
>
> Carl Steen

I do quite a bit of work with data via cell phones (normally mobile -
moving).  Data over cell phone is not as simple as data over a normal
phone (if you want it to be reliable).  I use a special modem with MNP10
protocol (packets with error checking).  I doubt that you will be very
successful with an acoutic coupler - but then I have never actually
tried that.



From [e-mail] Tue Apr 23 07:50:29 1996
From: Nathan Sykes <[e-mail].n>
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: How can I print directly on PCBs?
Date: 17 Apr 1996 23:25:35 GMT
Message-ID: <01bb2cb3.fba540e0$05160ace@nsykes>
References: <[e-mail]> <4khkgu$[e-mail]>


On Wednesday, April 10, 1996, Glenn Sparks wrote...

> One method that I have used that I've never seen mentioned is using an
> HP single pen flatbed plotter with a sharpie mounted in place of the
> std pen.  The ink from a sharpie will resist the etch.

I've read that red sharpie ink resist better than black.  Never tried it.

Nathan, KD4GHG



From [e-mail] Tue Apr 23 07:50:31 1996
From: Lee Allen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: How to interface Osc "cans" w/ CMOS @ 12VDC?
Date: Thu, 18 Apr 96 20:54:57 GMT
Distribution: usa
Message-ID: <[e-mail]>
References: <4l5l5k$[e-mail]>
Reply-To: [e-mail]

In article <4l5l5k$[e-mail]>
           [e-mail] "Cliff Yamamoto" writes:

> Greetings,
>
> This may seem like a simple question, and I hope it is.  But not having
> used these components before, I'm not sure.
>
> I have a CMOS circuit running off 12VDC.  I need a clock source.  Digikey
> has some Oscillator "cans" (I call them "cans" because they are in those
> silver cans the size of a 14pin DIP) from ECS that are labelled TTL/CMOS.
>
> What I don't know is, can I interface these ECS TTL/CMOS oscillators
> directly to my CMOS circuit?  I believe these oscillators run off of
> 5VDC so do I need a pullup to 12VDC on their output?  I'm driving a
> CD4518 chip for divide purposes.
>
> Thanks in advance for any advice.
>
> Regards,
> - Cliff


You can't connect direct due to the differing supplies and thus logic
levels. You'll need to use a logic level shifter as an interface.
For example MC14504BD = hex logic level shifter.

If your application is non critical and/or low frequency you could use a
single transistor and a couple of resistors as a level shifter. Crude
but easier to patch into a circuit as an after thought.


--
Lee Allen. Altek Instruments    Email: [e-mail]
Walton-on-Thames, Surrey UK     Phone: [phone] & 244110
http://www.hello.co.uk/altek/   Fax & Vox mail: 01932 227279



From [e-mail] Tue Apr 23 07:50:31 1996
From: [e-mail] (William Nolle)
Newsgroups: rec.radio.amateur.homebrew
Subject: Making professional looking panels
Date: Mon, 22 Apr 1996 19:05:38 GMT
Message-ID: <4lge9o$[e-mail]>

For those asking about the professional looking front panels for your
projects, here is what i use and that works just great. I use a
product called Masterpiece it's a metallic laser printer material with
a self adhesive back. I use CorelDraw for the artwork, but other paint
programs would work. Then i print it on my laser printer and have done
many panels that look professional. The material comes in either Gold
or Aluminum. I do advice a coat of clear spray to make wiping
fingerprints of easyer. Be carefull tough not use a laqauer based
spray, test it on a sample first. It's available at 1-800-A-PAPERS.

Bill [e-mail]



From [e-mail] Tue Apr 23 07:50:33 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MICROSTRIP LINES - what are they and who sells them
Date: 21 Apr 96 22:32:14 GMT
Message-ID: <[e-mail]>

Richard Potter asks:

> I notice that many of these have a "component" shown in the circuit
> as a "microstrip" or "microstrip line." The parts list simply lists
> them as "Z1 = 0.31 x 0.15 microstrip."

> What are these devices and who makes them? Even more important, who
> sells them?

You make them when you etch the pc board! Microstrip lines are
distributed components, somewhat analogous to taking a piece of
coaxial cable, slitting it along one edge and unrolling it flat, so
you have a conductor floating over a groundplane, separated by
dielectric. By varying the size of the line you control the impedance,
and can make components that exhibit inductive or capacitive reactance
at the desired frequency.

See, among other references, the ARRL or RSGB Microwave Handbooks for
further details.

> BTW..I'm wanting to build a 100 Mhz to 1.4 Ghz broadband amp. Any
> favorite circuits that worked out as a good experience for you that
> you's like to share...or even a suggestion as to which type of amp
> worked well.

I recently built a broadband amplifier as the IF preamp for a 10 GHz
WBFM rig, using a MAR-6 MMIC driving a MAR-3, with 1 nF chip coupling
capacitors between them. I followed WB5LUA's suggestion of running
them off an 8 volt bus (with the help of a 7808 voltage regulator) to
make the power supply that much stiffer and more resistant to dying
batteries. I laid out the microstrip (such as it is :-) with scotch
tape and a straightedge, and drew in the DC stuff with one of the
(in)famous Sharpie pens. It works fine.

Laura Halliday VE7LDH         "C'est une femme mutine, assez
[e-mail]           elegante, grave et legere, ayant le
[e-mail]               sens du confort et du plaisir
Locator: CN89mg                en tout." - C. Deneuve



From [e-mail] Tue Apr 23 07:50:34 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (JT)
Subject: Re: Need info: So Cal surplus/electronics/ham shops
Message-ID: <[e-mail]>
References: <[e-mail]>
Distribution: usa
Date: Mon, 22 Apr 1996 01:58:44 GMT

David Feldman ([e-mail]) wrote:
: Business will start taking me to so cal this year, and I'd like to take
: the opportunity to visit good surplus-electronics-ham type shops. I used
: to live in the LA area about 15 years ago, but I've forgotten my favorite
: haunts. Any referrals would be gratefully appreciated!

: 73 Dave WB0GAZ [e-mail]

Hopefully this thread will go somewhere!  I'd like to find more surplus
electronic ham places as well.

1. The last sat of every month there is the TRW ham swap meet. I think its
the corner of Marine and Aviation in Redondo Beach.  All kinds of
stuff for sale.

2. For surplus, try C&H surplus on Colorado Blvd in Pasadena.

3. For (new) ham stuff there's Jun's in Culver City, or HRO in Anaheim.

Anyone else have good "secret" spots they'd like to let us in on ?  :)

Later,

James KB6NYG

--
                                             [e-mail]


From [e-mail] Tue Apr 23 07:50:35 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Erik K.Sorgatz)
Subject: Re: Need schematics for Linear Amp. (600 watt)
Message-ID: <[e-mail]>
References: <4kmv9k$[e-mail]> <4kp7du$[e-mail]>
Date: Mon, 22 Apr 1996 19:53:24 GMT

In article <4kp7du$[e-mail]> qwick@???????.com (Qwick) writes:
>Dave Perkins <[e-mail]> wrote:
>
>>  Me and my step-dad want to build a linear amp but we need to know what
>>parts to get and schematics on it...If anyone has any of the above or
>>maybe and article from QST on how to build one, please let me know..
>>
>>  Please email me (I rarely check the newsgroups)
>>  Any help would be greatful
>
>>  Thanx again
>>  Dave
>
>I'm a Computer Enginering major and for a project, I'd like to build a
>CB linear.  Thus...
>I'd like the same info if possible...  [e-mail]
>Thanks
>

 Its obviously flame-bait...ignore him.


[e-mail] (or:[e-mail]) KB6LUY (private email:eks@westwo
rld.com)
TTI 3100 Ocean Park Blvd. Santa Monica, CA  90405
"ANY COMMENTS OR STATEMENTS MADE ARE NOT NECESSARILY THOSE OF CITICORP, ITS SU
BSIDIARIES
OR AFFILIATES." (Copyright 1995, ARR-permission to store/archive hereby grante
d)


From [e-mail] Tue Apr 23 07:50:36 1996
From: Mark Mandelkern <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: New Svetlana Trasmitting tubes
Date: 15 Apr 1996 08:12:13 GMT
Message-ID: <4kt0ct$[e-mail]>

Re: New Svetlana Trasmitting tubes

Any of the 4CX1000A designs should work well with the Svetlana
4CX1600B.  There have been several designs in the ham magazines.
I use one 4CX1000A in a 1.8 to 54 mc amp and one on 144 mc.  These
tetrodes are all similar, and the circuit need not vary with the
tube mfgr.


73,   Mark   KN5S    NM




From [e-mail] Tue Apr 23 07:50:37 1996
From: Mark Mandelkern <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: New Svetlana Trasmitting tubes
Date: 15 Apr 1996 08:12:38 GMT
Message-ID: <4kt0dm$[e-mail]>

Re: New Svetlana Trasmitting tubes

Any of the 4CX1000A designs should work well with the Svetlana
4CX1600B.  There have been several designs in the ham magazines.
I use one 4CX1000A in a 1.8 to 54 mc amp and one on 144 mc.  These
tetrodes are all similar, and the circuit need not vary with the
tube mfgr.


73,   Mark   KN5S    NM




From [e-mail] Tue Apr 23 07:50:38 1996
Newsgroups: comp.dsp,rec.radio.amateur.homebrew
Subject: new version of ezkitapp for the Macintosh available
Message-ID: <[e-mail]>
From: Gerrit Polder <[e-mail]>
Date: Mon, 22 Apr 1996 08:24:40 +0200

A new version of ezkitapp for the mac is available.

Ezkitapp is the Macintosh version of ezkitapp, the EZ-KIT Lite Host
Program. With this program you can communicate with and upload programs
to
the EZ-KIT Lite from Analog Devices.

version 1.1 - April 1996:
        - added upload/download of data/program memory files
        - added graphics memory map display
        - added demo commands
        - changed status window (looks better now)

it can be found at info-mac and it's mirrors:

[Archived as /info-mac/app/ez-kit-lite-11.hqx; 148K]

or in the macintosh hamradio archive:

file://oak.oakland.edu/pub/hamradio/mac/digital/ezkitapp_1.1.hqx

Gerrit.
[e-mail]


From [e-mail] Tue Apr 23 07:50:39 1996
From: Gordon B Slater <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Professional looking front panels - how?
Date: Wed, 17 Apr 1996 14:48:52 GMT
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]

In article: <[e-mail]>  [e-mail] (Ga
ry Coffman)
writes:

> >I would very much appreciate any advice on how to create silk-screen-like
> >panels.
>
> Create and use a real silk screen. I know of no better method, and it
> is not hard to do. If you can make a PC board, you can make a silk screen.

any chance of elaborating the technique or pointing us to a URL Gary?
I've been paying screen-printers for years, but if I can do it here
on the bench I'll have much more neer money left over....

TIA
Gordy
--

* Gordon B. Slater              Email:  [e-mail] *
* G B Slater (Communications)                  Fax: [phone] *
* http://www.netlink.co.uk/users/gbscomms        Sales/Service/Ops *
-                                                                  -
* To quote an infamous lady...                                     *
* "Oh, 'tis my delight on a shiny night in the season of the year" *




From [e-mail] Tue Apr 23 07:50:40 1996
From: [e-mail] (Ed Ganger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Professional looking front panels - how?
Date: Sun, 21 Apr 1996 10:04:50 -0400
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>

In article <[e-mail]> rlong@magnu
s.acs.ohio-state.edu (Ron Long) writes:
>I use the following. I create the panel in a PC drawing program
>(CorelDraw, e.g.) using colors as appropriate, including the desired
>overall background color. I then take the disk to Kinkos and print it on
>one of their professional quality laser printers ($1.99 per page - and for
>many projects you can have
>2 or more copies on that page). If there is a window, like for an LCD, I
>cut it out with a knife. Finally I have Kindo laminate the page. You ask
>for roll laminating, and the thinnest material, 2 mils I think. They have
>two thicknesses. Finally I spray the panel (not the laminate) with a shot
>of spray adhesive, available at hobby stores, and place the overlay. It
>works great, looks good, and is almost indestructible.
>Ron, w8gus.

Even easier, if you want to mess around ....

I reverse the bitmap before I print to a BW Laser printer on overhead
film. This puts the markings on the BACK of the acetate(? mylar?)
sheet. Then I mix up some clear epoxy and with a plastic spreader
I smear it all over the sheet and stick it on. With a little trouble,
bubbles are eliminated. After about 2 minutes (when the epoxy is gummy)
clean up with denatured alcohol.

Also, BONDO (car fixit goop) can be spread over the panel and the
plastic sheet set into it. I never tried spray adhesive, but it should
work. The advantage of BONDO is that it is a neutral grey and gives a
good background.

The big trick is to print MIRROR IMAGE of your panel onto the BACK of
your clear sheet. This eliminates any laminating step.

By the way --- It is important to use the ACTUAL PRINTER that you intend
to do your finish work on and make a "calibration sheet." Many printers
are not quite 1:1 and if your panel is 5% off, all sorts of things do not
line up well. ( Most printers are within about 2-4% uncalibrated)
Regards,
Ed



From [e-mail] Tue Apr 23 07:50:42 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Conflict of interest again.
Date: Fri, 19 Apr 96 09:12:26 PDT
Message-ID: <[e-mail]>
References: <4l5tbt$16b$[e-mail]>


> From: Jay Craswell <[e-mail]>

> Is there a law against making some money for your
> work?  Is QST supposed to be the Peoples Republic of Amateur Radio?
> Yes, I am one of those writers with a vested interest and if I read
> your comments correctly I would fit your conflict of interest.  I
> just happen to think we should support US designers and kit
> builders.  Not try to trash them for having an interest in paying a
> few bills.
> --
> 73, Jay WB0VNE - AAV5TH
>
Hi Jay, I'm one of those that has complained in the past about the way
some articles in QST have been presented.  But I have no problem with
the author selling parts or kits (I've done it myself).  But I do have
a problem with presenting a construction article and then keeping part
of the critical information (such as the software or pcb layout)
confidential and forcing the reader to buy from the author, or
redesign the whole thing.  Fine, sell parts and kits, but also provide
the information to those that might get more satisfaction out of doing
their own work.  It probably won't hurt sales that much anyway....

73.....KI7RH (Jay)



From [e-mail] Tue Apr 23 07:50:42 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Conflict of interest again.
Date: 22 Apr 1996 13:54:49 -0400
Message-ID: <4lgh59$[e-mail]>
References: <4lg6u0$[e-mail]>

In article <4lg6u0$[e-mail]>, [e-mail] (Rob
Whitacre) writes:

>
>The historical tube article was an out and out advertisement paid for by
you
>and me. I see this all the time in trade publications I receive, but in
that
>case I am not paying for them. When I pay for a magazine I expect the
>advertisers to pay too.
>
>Rob WB8WQA
>
>

The facts seem to suppport your comments 100 percent Rob.

But I am more concerned with the technical inacccuracies presented. It is
a much larger problem when fact are mis-stated to promote a product, even
in a paid ad.

Technical articles should be based on fact, not hyperbole.

I am puzzled why more of us don't share that view.

73 Tom



From [e-mail] Tue Apr 23 07:50:44 1996
From: Dave Lagzdin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: question  on RC radio
Date: 18 Apr 1996 14:31:00 GMT
Message-ID: <4l5jn4$[e-mail]>
To: all


I have come to the conclusion from reading this group over the past
year that you guys do indeed know everything about everything!

I seem to recall that the typical Radio Control receiver is an AM
beast which put out some kind of variable width pulse to the servos.

Can anyone provide or point me to specifics: range of pulse width,
frequency of pulses etc?

Thanks

Dave

--
is this where I put my tagline?




From [e-mail] Tue Apr 23 07:50:44 1996
From: Peter Trapp <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: question  on RC radio
Date: 19 Apr 1996 03:01:50 GMT
Message-ID: <4l6vmu$[e-mail]>
References: <4l5jn4$[e-mail]>
To: [e-mail]

Dave Lagzdin <[e-mail]> wrote:
>
>I have come to the conclusion from reading this group over the past
>year that you guys do indeed know everything about everything!
>
>I seem to recall that the typical Radio Control receiver is an AM
>beast which put out some kind of variable width pulse to the servos.
>
>Can anyone provide or point me to specifics: range of pulse width,
>frequency of pulses etc?
>
The typical R/C system can be AM or FM.

The neutral position pulse width is approx 1.25 Millisecond wide, while the
range is approx 1 to 1.5 ms at the extremes. The pulse frame repetition rate i
s
approx 60 frames per second (each frame contains a pulse for each channel
ie. 4 channel r/c system - 4 pulses per frame).

I hope this answers you questions.

BTW You might find one of the rec.models.rc news groups interesting
--
******************************************************************
*      Peter Trapp KD4CN - [e-mail]                   *
******************************************************************




From [e-mail] Tue Apr 23 07:50:46 1996
From: Alan Wolke <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: question  on RC radio
Date: 19 Apr 1996 13:05:15 GMT
Message-ID: <4l832b$mdc$[e-mail]>
References: <4l5jn4$[e-mail]>

>I seem to recall that the typical Radio Control receiver is an
>AM beast which put out some kind of variable width pulse to the
>servos.
>
>Can anyone provide or point me to specifics: range of pulse
>width, frequency of pulses etc?

Dave,

The servos in most hobby RC systems rely on a pulse stream to set
their position.  The pulse width determines the position, 1.5ms
for center, 1.0ms for full left, and 2.0ms for full right.  The
pulses repeat every 20ms.  Each servo channel is transmitted in
series in a frame (20ms).  The RF output begins a frame by
turning off for a fixed modulation time, usually 0.5ms, then goes
to full amplitude for the remainder of the channel 1 pulse width
(0.5ms to 1.5ms).  This is followed by the beginning of channel
two, which also starts out with 0.5ms off time....  All of this
is followed by a longer sync pulse of RF, and the cycle repeats.
The National Semi LM1871 and 1872 used to be popular encoder/tx
and rx/decoders used in these systems.  They've got a decent
description of the methods.

Alan

--
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+         I usta cudn't spel enjinere, now I ar wun             +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


From [e-mail] Tue Apr 23 07:50:47 1996
From: Steve Clements <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re homebrew front panels
Date: Wed, 17 Apr 1996 19:51:32 GMT
Message-ID: <[e-mail]>

When I wanted to make a nice front panel for some of my kit, I used a
simpler and cheaper method than anodising,silk screens or engraving.
A more "amateur" method :-)

Stating with the bare ally panel, I rubbed it down with 1200 (fine) wet
and dry, and sprayed it with a cellulose (speeling?) filler/primer as
bought in car shops. This gives a good flat white base.

Then application of the nice fonts you can get in Letraset (rub down
lettering) these days for the text.

A cellulose clear laquer to protect the lettering , several layers will
finish the job.

I've used this on gear I take /P contesting, and doesn't seem to wear
off
at all.

A few pounds and few hours and sorted.

73 Steve
-
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 STEVE CLEMENTS (radio : G1YBB @ GB7MAD.#24.GBR.EU)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


From [e-mail] Tue Apr 23 07:50:48 1996
From: [e-mail]    (Bill Newkirk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Re homebrew front panels
Date: 23 Apr 1996 03:42:13 GMT
Message-ID: <4lhjil$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Bill Newkirk)

In <[e-mail]>, Steve Clements <steve.clements@a
migabee.posnet.co.uk> writes:
>Then application of the nice fonts you can get in Letraset (rub down
>lettering) these days for the text.

works, but, boy, those rub off letters sure can be a pain to use.

limited ability to set odd sizes for best fit as well....

Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
Melbourne, FL                       duty now for the future of amateur radio
Lombardi's 1st Law of Business:
Companies succeed in spite of their best effort.  If they succeed at all.



From [e-mail] Tue Apr 23 07:50:49 1996
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
From: [e-mail] (Gary Coffman)
Subject: Re: RFI: Eico 710 Dipper Coils?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4l05n3$[e-mail]>
Date: Tue, 16 Apr 1996 19:02:29 GMT

In article <4l05n3$[e-mail]> [e-mail] (Watts)
 writes:
>Hello, I have obtained an Eico model 710 Grid Dip Meter, covering
>0.4 to 250 MHz, but no coils.  Internal inspection reveals three
>terminals for the coils, and a small test with a coil of wire didn't
>come out too nice.
>Anybody have any information on how the various coils are wound or
>where to get a copy of a manual?
>Trying to dip,
>galen, KF0YJ

Straining the brain, I seem to recall that dipper uses the Hartley
circuit.  So the third wire connection is to a tap near one end of
the coil for feedback excitation. Memory could be faulty, but I
also recall that the highest frequency "coil" is just a loop of
heavy wire formed from a piece of wire about 6 inches long and
plugged into only the two outside pins of the socket. Feedback
in that case must be by circuit strays. I had one of these many
years ago, but sold it and bought a solid state version, a Heath,
a long time ago.

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


From [e-mail] Tue Apr 23 07:50:51 1996
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RFI: Eico 710 Dipper Coils?
Date: Sun, 21 Apr 1996 03:18:48 GMT
Message-ID: <4lc9k6$[e-mail]>
References: <4l05n3$[e-mail]> <4l353h$[e-mail]>

[e-mail] (Tom Bruhns) shared the following priceless pearls of
wisdom:

>Watts ([e-mail]) wrote:
>: Hello, I have obtained an Eico model 710 Grid Dip Meter, covering
>: 0.4 to 250 MHz, but no coils.

I've got an old 710 that I don't want to get rid of, but I do have the
manual and the coils.  If you can work out a foolproof system for me
to insure getting the stuff back, you are welcome to borrow them for a
month or so.

Jim



Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1/C phone--Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-----A&P Mechanic



From [e-mail] Sun Apr 28 13:11:07 1996
From: Pete <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: *Problem wiring CAT to IC725*
Date: 25 Apr 1996 22:54:51 GMT
Message-ID: <4lovrr$nav$[e-mail]>

Hi all!
        Can anyone tell me how to wire up a RS232-TTL converter
to my IC725

I have the following connections out of my converter:

CTS, RTS, TXD, RXD, GND.

where do I connect these on my radio?

Peter


From [e-mail] Sun Apr 28 13:11:08 1996
From: Russell Chandler <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 2 Watt Resistors
Date: Tue, 23 Apr 1996 11:38:17 -0400 (EDT)
Message-ID: <[e-mail]>
References: <[e-mail]>

Could someone point to a source for
2 Watt, 5% Tolerence, Carbon Composistion
resistors.

                     Thanks
                     Russell


From [e-mail] Sun Apr 28 13:11:09 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2 Watt Resistors
Date: 24 Apr 1996 00:19:31 -0400
Message-ID: <4lka4j$[e-mail]>
References: <[e-mail]>

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

>Could someone point to a source for
>2 Watt, 5% Tolerence, Carbon Composistion
>resistors.
>
>

Make sure they are carbon comps! To my knowlege, only A-B still makes them
and they are special order. At least in manufacturing quantities.

73 Tom


From [e-mail] Sun Apr 28 13:11:10 1996
From: Rex Hebert <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Anodizing Front Panels?
Date: Tue, 23 Apr 1996 16:29:22 -0700
Message-ID: <[e-mail]>

I've always wondered ...
 How does Anodizing work? Whats the process?
 I imagine it to be something like electroplating.
 Can it be done at home for small project front panels?
 Does it only work with aluminum?

 Is there a FAQ that addresses this?
 Thanks



 Rex Hebert

 TECH TOYS!
 Microcontroller Solutions
 Lafayette, Louisiana

 [e-mail]


From [e-mail] Sun Apr 28 13:11:11 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anodizing Front Panels?
Date: 24 Apr 1996 16:15:33 GMT
Message-ID: <4llk35$[e-mail]>
References: <[e-mail]>

Rex Hebert ([e-mail]) wrote:
: I've always wondered ...
:  How does Anodizing work? Whats the process?
:  I imagine it to be something like electroplating.
:  Can it be done at home for small project front panels?
:  Does it only work with aluminum?

Anodizing is oxidizing under power.  Chemical oxidation always occurs at
the anode in any electrochemical cell.  The panel is made the anode in
a bath that's normally chromic or sulphuric acid, with proprietary
additives in commercial operations, I believe.  After anodizing an
aluminum piece, there is a layer of "porous" aluminum oxide on the surface.
Typically it's 1/2 to 3 thousandths of an inch thick.  After anodizing,
it's optionally dyed some color (again with proprietary dyes) and sealed,
to "close up the pores".  Anodizing is only done on metals that form a
tight, insoluble oxide:  mainly aluminum and titanium.

_CAN_ it be done at home for small projects??  Yes.  Do you really
_want_ to do it??  Probably not!  Unfortunately, anodizing places
usually have a minimum billing, like $50 or $100.  If you just have
one panel to do, you might be able to cajole or bribe them into doing
it as a sample for you.  If you insist on doing it at home, your local
library should have, or be able to get, a book on metal finishing that will
cover the basics of anodizing.

Some personal experience:  alloys do make a difference.  The Anadite shop
in Tucson recommended that I use 2024-T3 to get a good, deep black.  They
were right.  But when I had to change anodizing shops when I moved, I found
that it was _very_ hard to find a shop that could do a good job on 2024-T3!
Panels came back all pitted--looked terrible.  Ended up having to _ship_
them to Anadite to get a good job.

--
Cheers,
Tom
[e-mail]


From [e-mail] Sun Apr 28 13:11:12 1996
From: [e-mail] (robert bowman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone have Amidon phone number?
Date: 25 Apr 1996 14:14:55 GMT
Message-ID: <4lo1cv$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail].
rochester.edu (Bill VanRemmen) says:
>
>Does anyone have the phone number, address or 'net address of Amidon
>Associates?

it was:
PO Box 956
Torrance, CA 90508
310-763-5770

but i think they move around a bit.


From [e-mail] Sun Apr 28 13:11:12 1996
From: [e-mail] (Sean Devanny)
Newsgroups: rec.radio.amateur.homebrew,rec.antiques.radio+phono
Subject: Article in ETI
Date: Tue, 23 Apr 1996 19:01:30 GMT
Message-ID: <4lj81f$[e-mail]>

There's a  5 part series on valve radio servicing and restoration in
the latest edition of ETI (Electronics today international) magazine



From [e-mail] Sun Apr 28 13:11:14 1996
From: Cal Eustaquio <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Conv  the SB-620 to 455 kc
Date: Fri, 26 Apr 1996 11:56:26 -0700
Message-ID: <[e-mail]>

Has anyone successfully converted the Heathkit SB-620 Hamscan from some
other IF to 455 kcs? I'm considering this as a major projct utilizing
easily obtainable  parts. But if anyone has any adds they'd like to
state, I'd be interested. Cal, N6KYR.


From [e-mail] Sun Apr 28 13:11:16 1996
From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CTCSS tone generator
Date: 27 Apr 1996 11:10:26 -0700
Message-ID: <[e-mail]>
References: <[e-mail]> <4lihp7$[e-mail]> <[e-mail]>

In article <[e-mail]>,
[e-mail] (David Kelly) wrote:
> In article <4lihp7$[e-mail]>, [e-mail] (Rob
> Whitacre) wrote:
>
> > In article <[e-mail]>,
> > [e-mail] says...
> > >
> > >Does anyone know how to make a simple CTCSS tone generator to connect to
> > >the audio input line of a 2M crystal rig? Is there a chip to generate
> > >these tones? Thank you.
> > >
> > >Andrew
> > >
> > >-------------------------------------------------------------------------
> > >[e-mail]      Compu$erve  73307,2755     Amateur Radio AA3AK
> > >-------------------------------------------------------------------------
> > >
> > >
> >
> > The Comm Spec boards work great, but if you are really interested in build
ing
> > your own, check out a company called MX-COM, INC., 800-638-5577.For exampl
e,
> > the MX315 will do what you want.
>
> The MX315 is a very nice part and its under $5 in modest volume. Last time
> I heard MX-COM would sell low volume to those who are interested.
>
> Also Ramsey makes at least one CTCSS kit, the one I'm thinking of uses the
> MX165 (or was it the MX365?) which encodes and decodes. Don't know how
> much the kit was.
>
> 73,
> --
> David Kelly N4HHE,   [e-mail],    [e-mail]
> ===========================================================
> To invent, you need a good imagination and a pile of junk.
>                 - Thomas Edison

Or if you are the experimental type, just build an audio oscillator
of the right frequency for the CTCSS tone required.  Look in the
library for the circuitry for an audio oscillator, which is no
more than an op-amp or two and a few resistors and capacitors.
The CTCSS frequency should be easy to find.  Just tune for the
right frequency and experiment.  Good luck.

73,

---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'
Remembering: KE6LTH, KD6HNU, March 22, 1996


From [e-mail] Sun Apr 28 13:11:17 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Delrin, insulating properties?
Date: Mon, 22 Apr 96 16:34:44 GMT
Message-ID: <4lgk3a$[e-mail]>
References: <4lg7bv$[e-mail]>

Post / CC by Mail

   [e-mail] (Stanley L. Flegler) wrote:

>Does anyone know the RF insulating properties of Delrin?

I have a catalog that shows specifications for Delrin AF blend as
follows:

Dielectric Strength Short Time (Volts/mil):  4,000
Volume Resistivity (Ohm/CM):  3x10^16
Dielectric Constant, 60 Hz:  not specified
Dielectric Constant, 1 KHz:  3.1
Dielectric Constant, 1 MHz:  3.1

From the standpoint of voltage breakdown, this material is one of the
best.  However, for overall electrical qualities, cross-linked
polystyrene is superior.

73,
Jack  WB3U


From [e-mail] Sun Apr 28 13:11:18 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Joe Mack)
Subject: Re: Delrin, insulating properties?
Message-ID: <[e-mail]>
References: <4lg7bv$[e-mail]>
Date: Tue, 23 Apr 1996 20:24:25 GMT

In article <4lg7bv$[e-mail]> [e-mail] (Stanley L. F
legler) writes:
>Does anyone know the RF insulating properties of Delrin?  Is it terrible
>or comparable with other materials such Teflon, polyethylene, etc?  Any
>input would be appreciated.  Stan Flegler K8RPA, [e-mail]
>
Not sure what you mean here. Delrin doesn't insulate from RF
at all. RF goes straight through it, which is why it is used
, similary for teflon etc

        Joe Mack
        [e-mail]




From [e-mail] Sun Apr 28 13:11:19 1996
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Delrin, insulating properties?
Date: Wed, 24 Apr 96 17:46:46 GMT
Message-ID: <4lm12q$[e-mail]>
References: <4lg7bv$[e-mail]> <[e-mail]>

Post / CC by Mail

   [e-mail] (Joe Mack) wrote:

>Not sure what you mean here. Delrin doesn't insulate from RF
>at all. RF goes straight through it, which is why it is used
>, similary for teflon etc

Hi Joe,

Which technical specification of plastics provides an indicator of
this characteristic?

73,
Jack  WB3U


From [e-mail] Sun Apr 28 13:11:20 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Steve Ellington)
Subject: Re: Delrin, insulating properties?
Message-ID: <[e-mail]>
References: <4lg7bv$[e-mail]>
Date: Wed, 24 Apr 1996 20:29:09 GMT

Dupont has the info on webb url
www.ashchem.com/GP/data/14134.htm
resistance is listed in great detail. 73

Stanley L. Flegler ([e-mail]) wrote:
: Does anyone know the RF insulating properties of Delrin?  Is it terrible
: or comparable with other materials such Teflon, polyethylene, etc?  Any
: input would be appreciated.  Stan Flegler K8RPA, [e-mail]


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


From [e-mail] Sun Apr 28 13:11:21 1996
From: [e-mail] (qrk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Fluorinert?
Date: Sat, 27 Apr 1996 09:27:49 GMT
Message-ID: <4lsopn$[e-mail]>
References: <4lrink$[e-mail]>

[e-mail] (Lawrence Koga) wrote:

>I am looking for Fluorinert.  It's almost as hard as finding relative
>grease, or a fantail spanner.

>Fluorinert is used in Mil-Spec equiment to draw heat away from components
>and transfer this heat to the heat sink.  Fluorinert comes in gel bags of
>various sizes.  No it is not the same as "Blue Ice".  "Blue Ice" performs
>a different function, it is used to retain heat.

3M makes Fluorinert.  In fact, fluorinert is trademarked by 3M.  Be
sure your wearing your seatbelt when they tell you the price!  The
substance is expensive!  The bags of flourinert made by 3M are called
"Liquid Heatsink".  They work quit well, but again they are expensive.

3M Industrial Chemical Products Division
[phone]  (literature request)

-
Mark Chun  |  [e-mail]  |  Santa Barbara, CA



From [e-mail] Sun Apr 28 13:11:22 1996
From: [e-mail] (Chris Boone)
Date: 21 Apr 96 20:42:30
Newsgroups: rec.radio.amateur.homebrew
Subject: FM Band Code Practice XMITTER- Help!
Message-ID: <[e-mail]>

5*** Quoting Ed Ganger to All dated 04-19-96 ***
> What I am looking for is a way to use Part-15 xmitters on the FM band,
> with Audio CW so that we can form a "Lunchtime Net"
>
> My first attempt was to AM modulate a 3.58MHz crystal divided by
> four, giving about 1 MW on 890KHz AM Band. This worked _really_ well
> here at the house with a range of about 200ft to a portable AM
> receiver.
> At work, however, due to building construction and computer noise,
> I get a maximum range of about 12-15 feet. (someone said that the
> metal floor and the metal ceiling were too close together to allow
> propagation at such a low frequency! These same people say that FM
> will have no problem filling the area!)
>
> I am trying to design a small transmitter with these important
> characteristics:
> 1. CHEAP -- I would like to see about 10 of these around work.
> 2. EASY TO BUILD -- I am hoping to build mine myself, and hope
>       that the (electronically aware) novices-to-be could build
>       their own.
> 3. Crystal control -- and I would hope to use a cheap uP crystal
>       for frequency control. This would keep all the transmitters
>       on a single frequency and eliminate off-frequency operation.
> 4. FM Modulation at about 500Hz-1KHz for audio code.
> 5. Low Power- part 15 type equipment.
> 6. 88-108 MHz operation so that standard FM radio could be used
>       as the "desk top" receiver.
Well Ramsey makes a FM xmtr for about 29 bucks...not xtalled controlled but at
FM BC freqs, you really dont need to worry too much....

You will have to inject a 1Khz toneinto the TX audio line inputs....
You could use the AC wiring as the antenna (using caps of say .01 or .01 in
series with the AC lead to the antenna out on the TX...I did that once with an
old RS FM mic and it covered the neighborhood)....once it hits a xfmr it wont
be going anywhere!

73
Chris
WB5ITT

GL on the upgrade!

--
|Fidonet:  Chris Boone 1:106/4267
|Internet: [e-mail]
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Sun Apr 28 13:11:23 1996
From: [e-mail] (robert bowman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM Band Code Practice XMITTER- Help!
Date: 27 Apr 1996 01:06:41 GMT
Message-ID: <4lrrv1$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail] (C
hris Boone) says:
>You will have to inject a 1Khz toneinto the TX audio line inputs....
>You could use the AC wiring as the antenna (using caps of say .01 or .01 in
>series with the AC lead to the antenna out on the TX...I did that once with a
n
>old RS FM mic and it covered the neighborhood)....once it hits a xfmr it wont
>be going anywhere!

you might be able to just float the signal on the AC wiring, if this
is just in one building. some intercomms used to do that, and it worked
reasonably well for voice, so CW shouldn't be a prob.


From [e-mail] Sun Apr 28 13:11:24 1996
From: NewsBoy! <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HAM
Date: 26 Apr 1996 23:09:43 GMT
Message-ID: <4lrl3n$rs2$[e-mail]>
References: <[e-mail]>

This was really damn weird....

--
"I am personally responsible for the agony of Christ"
"I am personally responsible for the agony of Christ"
"I am personally responsible for the agony of Christ"
"I am personally responsible for the agony of Christ"


From [e-mail] Sun Apr 28 13:11:25 1996
From: Ted Spitzmiller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HAM Equipment Available
Date: Thu, 25 Apr 1996 14:14:55 -0600
Message-ID: <[e-mail]>

An elderly gentleman recently passed away and left his wife with
a whole shop full of a wide vcariety of HAM equipment.  She would
like to have someone in the New Mexico area (or farther away if you
can travel) give her a token price for his equipment.  She has no idea
what it is worth (and neither do I) but she would like someone to
make her an honest offer for whatever they would like have, and
perhaps tell her what might simply be junk so that she can
get rid of it without feeling like she is thowing away something
that might be useful to someone.

She is in Albuquerque.

Please call me, Ted at [phone] evenings for details.

Thanks a bunch.

Ted


From [e-mail] Sun Apr 28 13:11:26 1996
From: "George J. Molnar" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Icom IC-215 for Marine use?
Date: Fri, 26 Apr 1996 00:15:04 -0600
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
To: SARUMAN <[e-mail]>

SARUMAN wrote:
>
> Yup it's me again with another question. Anyone know if it's possible to use
> the Icom IC-215 to Tx/Rx on the Marine Bands? If no does anyone know of a mo
d
> to allow this? Thanx folks
> Hoping that it's simply a matter of installing Crystals but doubt it

Don't know if there is a mod or not, but it should be stressed that
any equipment not designed for, and type-accepted, for marine use
is ILLEGAL to operate there. Emergency use aside, it's just not allowed.
Marine gear has very tight frequency stability and accuracy
specifications, specific power levels, and spectral purity requirements.



--
George J. Molnar
Highlands Ranch, Colorado
Amateur Radio: KF2T@N0QCU.#NECO.CO.USA.NOAM
http://www.interealm.com/p/gmolnar/index.html


From [e-mail] Sun Apr 28 13:11:28 1996
From: [e-mail] (Christer Johansson)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: L.O.S.A Contribution Form
Date: Wed, 24 Apr 1996 16:24:01 GMT
Reply-To: [e-mail]
Message-ID: <[e-mail]>

List Of Stamp Applications (L.O.S.A for short)
==============================================

If you have done something with the BASIC Stamp (big or small)
that you are willing to tell others please use the form below and
write a short description, nothing fancy is needed just a simple
explanation. If you have source code to share that's even better but
it's not necessary.

Then e-mail the form to:

     [e-mail]

With the following as the subject:

     L.O.S.A Contribution

Or you could point your Web-browser to the following URL and fill in
the L.O.S.A form on the Web-page...

     http://www.hth.com/losa.htm

The latest version of L.O.S.A is going to be posted to the following
mailing lists and news groups, I will update it approx. once a month.

Mailing lists:

BASIC Stamp Mailing List

News groups:

comp.robotics.misc
comp.home.automation
sci.electronics.misc
rec.radio.amateur.homebrew
rec.radio.amateur.misc

FTP-site:

     ftp://ftp.parallaxinc.com/pub/text/losa.txt

You can also find the latest version on the following URL...

     http://www.hth.com/losa.htm


[--- cut ---]

======================================================================
                    - L.O.S.A Contribution Form -
======================================================================
 New Contribution [ ]  Update [ ]
----------------------------------------------------------------------

 Title :
 Author:                                       Date:

 E-mail: (optional)
----------------------------------------------------------------------

 Stamp model   : BASIC Stamp/BS1-IC/BS2-IC
 Code available: YES/NO
 Filename      : (optional)
 URL           : (optional)
----------------------------------------------------------------------
 Description   : (5-50 rows describing your application)


======================================================================

[--- cut ---]

If you think something are missing in the "L.O.S.A Contribution Form"
please let me know and I will add it.

Regards,

/Christer

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon  -  Christer Johansson  -  E-mail: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
     >>  World Wide Web On-Line Catalog - http://www.hth.com  <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Sun Apr 28 13:11:29 1996
From: [e-mail] (Larry Mackey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for info on QRP 6 meter circuits
Date: Tue, 23 Apr 1996 21:41:27 GMT
Message-ID: <4ljiqc$[e-mail]>
Reply-To: [e-mail]

I am interested in building a 6 meter QRP setup for my own
experimenting.

While I have some old circuits, I was hoping to find some more upto
date designs using some of the IC's that I assume are on the market
today.

I am hoping to be able to make the transmitter and receiver more
compact (for backpacking, etc.)

Anyone have any ideas where I can look?

Regards
Larry Mackey  WD6GGJ
Larry Mackey  Staff EE  Oceaneering Technologies
16201 Trade Zone Ave.  Upper Marlboro, MD 20774
Voice Mail:  301 249 3300  FAX Mail  301 390 1309
E-Mail:  lmackey@adtech1,oceaneering.com



From [e-mail] Sun Apr 28 13:11:30 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] ("Stephen Walters")
Subject: Re: Looking for info on QRP 6 meter circuits
Message-ID: <[e-mail]>
References: <4lhhmj$[e-mail]>
Date: Sun, 28 Apr 1996 12:06:44 GMT

me too...


From [e-mail] Sun Apr 28 13:11:30 1996
From: [e-mail] (HH357)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need info: So Cal surplus/electronics/ham shops
Date: 25 Apr 1996 09:25:56 -0400
Message-ID: <4lnuh4$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (HH357)

Sorry, I don't have any "secret" spots, but the TRW HAM swap meet is this
Saturday 7-11 am.   Aviation blvd and Marine (El Segundo or Torrance)


From [e-mail] Sun Apr 28 13:11:31 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Mark Zenier)
Subject: Re: Need info: So Cal surplus/electronics/ham shops
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Date: Mon, 22 Apr 1996 17:10:34 GMT

in <[e-mail]>, JT wrote:
: Anyone else have good "secret" spots they'd like to let us in on ?  :)

For those with WWW access, try the surplus directory pages in
Filip G's pages.

http://www.paranoia.com/~filipg/

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



From [e-mail] Sun Apr 28 13:11:33 1996
From: [e-mail] (DAVE.FORMILAN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Phone In-Use Light
Message-ID: <[e-mail]>
Date: Thu, 25 Apr 96 10:50:00 -0400
Distribution: world
Reply-To: [e-mail] (DAVE.FORMILAN)

Does anyone a nifty circuit for a phone in-use indicator. The indicator
can be LED, neon or whatever. I just need something to light at each of
my phones that would tell the would-be phone user that the phone line is
being used.

I lose more connections to the Internet when either my wife or daughters
picks up the phone and says sorry.

I sure someone must have solved this problem without major rewining or
adding a dedicated line.

Thanks,

Dave
---
  OLXWin 1.00a  MSI - Connecting The World (tm)

              .....oooooOOOOOo         http://www.intac.com/~cono
      __,-----. ---+_________#_     The Roy Hobbs BBS [e-mail]
     |________| |__|___________}          Node 1: 201-641-7307
      ooooo oo ~ ooO-O-O-O == oo\         Node 2: 201-641-3126



From [e-mail] Sun Apr 28 13:11:35 1996
From: Michael Blankenship <mblank@topeka>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Phone In-Use Light
Date: Fri, 26 Apr 1996 13:34:45 -0500
Message-ID: <Pine.SOL.3.91.960426133224.14279C-100000@topeka>
References: <[e-mail]>

Just connect your outside phone line to the "line" connector of your
modem and the rest of the house connects to the "phone" connector on your
modem card. That way, one cannot get a "live" connection whenever your
computer is on-line.

On Thu, 25 Apr 1996, DAVE.FORMILAN wrote:

> Does anyone a nifty circuit for a phone in-use indicator. The indicator
> can be LED, neon or whatever. I just need something to light at each of
> my phones that would tell the would-be phone user that the phone line is
> being used.
>
> I lose more connections to the Internet when either my wife or daughters
> picks up the phone and says sorry.
>
> I sure someone must have solved this problem without major rewining or
> adding a dedicated line.
>
> Thanks,
>
> Dave
> ---
>   OLXWin 1.00a  MSI - Connecting The World (tm)
>
>               .....oooooOOOOOo         http://www.intac.com/~cono
>       __,-----. ---+_________#_     The Roy Hobbs BBS [e-mail]
>      |________| |__|___________}          Node 1: 201-641-7307
>       ooooo oo ~ ooO-O-O-O == oo\         Node 2: 201-641-3126
>
>
>


From [e-mail] Sun Apr 28 13:11:36 1996
From: [e-mail] (Curtis, Charles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:  Pinout for MRF966
Date: 24 Apr 96 18:37:00 GMT
Message-ID: <[e-mail]>


Date: Mon, 22 Apr 1996 14:49:43 GMT
From: [e-mail] (Chris Hinkle )
Subject: Pinout for MRF966

  Help, need pinout for mrf966. any help appreciated.

N7UJU, Chris in Gilbert, AZ.
 ----------------------------------------
My search through a Motorola database turns up nothing on this number.

Chuck, N2UCN


From [e-mail] Sun Apr 28 13:11:36 1996
From: [e-mail] (Rob Whitacre)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pinout for MRF966
Date: 25 Apr 1996 12:05:54 GMT
Message-ID: <4lnpr2$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail] says...
>
>  Help, need pinout for mrf966. any help appreciated.
>
>N7UJU, Chris in Gilbert, AZ.

Here is the pinout for the MRF966:  looking at the top of the device (the
side with the printing on it), the leg which is longer than the others is the
drain. Clockwise from this leg you have source, gate 1, and gate 2.

Rob WB8WQA



From [e-mail] Sun Apr 28 13:11:37 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] ("Stephen Walters")
Subject: Re:  Pinout for MRF966
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Thu, 25 Apr 1996 00:21:17 GMT

what about MRF 646?


From [e-mail] Sun Apr 28 13:11:38 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Mark Zenier)
Subject: Re: Professional looking front panels - how?
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <1996Apr19.174946.26042@ke4 <4lbeqr$[e-mail]> <4liq9n$[e-mail]>
Date: Wed, 24 Apr 1996 17:41:12 GMT

in <4liq9n$[e-mail]>, robert bowman wrote:
: >Gary, thanks for posting this.  My only silkscreen experience was
: >about twenty years ago when I printed my own QSL cards.  I didn't
: >realize photoresist could be applied directly to the silk.  Neat.

: you can also photoprocess a sheet of gel, and adhere it to the silk.
: its a fairly easy processs, and gives a little better resolution
: for pc work. the name escapes me at the moment, but there is one
: company that is real big in the field. they have an excellent line
: of aluminum frames, registration devices, and so forth. a little
: spendy for a one off hobby project, but will really pay back if you
: are doing volume. wooden frames, vise grip type stretchers, and that
: stuff is best left for qsl cards. check Thomas Register, as i'm sure its
: listed. i'll post the name, if it ever surfaces in my failing neural
: net.

Ulano ?

The buzzwords seem to be direct (a photoemulsion that is exposed and
developed on the screen) and indirect (a photoemulsion that is exposed
and developed on the backing paper and then applied to the screen).
A tradeoff for ease of use versus accuracy.

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



From [e-mail] Sun Apr 28 13:11:39 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Conflict of interest
Date: 23 Apr 1996 07:21:57 -0400
Message-ID: <4liegl$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail]
(Clint Bradford) writes:

>You didn't believe that the article - when taken in its entirety -
>benefitted the Amateur community with its information?
>
>Clint Bradford

No, not at all. See the thread in equipment.

73 Tom


From [e-mail] Sun Apr 28 13:11:40 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Re homebrew front panels
Date: 23 Apr 1996 16:44:09 GMT
Message-ID: <4lj1cp$[e-mail]>
References: <4lhjil$[e-mail]>

Bill Newkirk ([e-mail]) wrote:
: In <[e-mail]>, Steve Clements <steve.clements
@amigabee.posnet.co.uk> writes:
: >Then application of the nice fonts you can get in Letraset (rub down
: >lettering) these days for the text.

: works, but, boy, those rub off letters sure can be a pain to use.

: limited ability to set odd sizes for best fit as well....

Well, one thing you could do is create the image you want and
transfer it to 3M's INT ("Image 'n Transfer") film to create
a dry-transfer image of just what you want.   Seems like a
rather convoluted way to do it, but it would get around the
problem you mention.

--
Cheers,
Tom
[e-mail]


From [e-mail] Sun Apr 28 13:11:41 1996
From: Mark Pettigrew <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Re homebrew front panels
Date: Wed, 24 Apr 1996 15:55:41 -0700
Message-ID: <[e-mail]>
References: <4lhjil$[e-mail]> <4lj1cp$[e-mail]>

Tom Bruhns wrote:
>
> Well, one thing you could do is create the image you want and
> transfer it to 3M's INT ("Image 'n Transfer") film to create
> a dry-transfer image of just what you want.   Seems like a
> rather convoluted way to do it, but it would get around the
> problem you mention.
>

Could you give a bit more detail of the INT film, Tom?

Thanks!

Mark
G0WLR


From [e-mail] Sun Apr 28 13:11:43 1996
From: Mike Willis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Re homebrew front panels
Date: Wed, 24 Apr 1996 16:19:01 +0100
Message-ID: <[e-mail]>
References: <[e-mail]>

Steve Clements wrote:
>
> When I wanted to make a nice front panel for some of my kit, I used a

snip

>
> Then application of the nice fonts you can get in Letraset (rub down
> lettering) these days for the text.
>
> A cellulose clear laquer to protect the lettering , several layers will
> finish the job.
>
> I've used this on gear I take /P contesting, and doesn't seem to wear
> off
> at all.
>


I have used this method, but be careful not to apply the clear laquer
too thickly in one go or the leteraset will start to break up. As I
found out early on.

Another possibility is to cover the panel with some stick on laminate or
vinyl. A realy simple way for smaller (under A4) panels is to prepare
the lettering on a wordprocessor and print it onto an OHP slide, back to
front if possible. Stick this onto a painted panel. Similar results can
be obtained by using paper with a clear OHP slide in front, or if you
want a "frosted" effect with a cut up A4 plastic paper holder in front.

With a colour inkjet printer and the expensive glossy paper you can make
some really impressive panel fronts for about a pound each.

Rear panels, I do with a permanent marker pen. Simple and if you make a
mistake it cleans off with alcohol (propanol or surgical spirit).

Remember, it is what is inside that counts, not how pretty the front is.

Mike


From [e-mail] Sun Apr 28 13:11:43 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Re homebrew front panels
Date: 24 Apr 1996 19:50:47 GMT
Message-ID: <4lm0mn$[e-mail]>
References: <[e-mail]>

Mark Pettigrew ([e-mail]) wrote:
: Tom Bruhns wrote:
: > Well, one thing you could do is create the image you want and
: > transfer it to 3M's INT ("Image 'n Transfer") film to create
: > a dry-transfer image of just what you want.   Seems like a

: Could you give a bit more detail of the INT film, Tom?

I'm not sure 3M still make it.  It is/was like sheets of solid black
dry transfer material.  You expose it through a line negative to
intense light and develop it with special INT developer, which washes
away the black where the film wasn't exposed to light.  The result is dry
transfer material with whatever line pattern you want:  lettering,
logos, block diagrams, smiley faces, Celtic lace patterns, whatever.

--
Cheers,
Tom
[e-mail]


From [e-mail] Sun Apr 28 13:11:45 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Re: Re homebrew front panels
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Fri, 26 Apr 1996 20:21:27 GMT

>Tom Bruhns wrote:
>>
>> Well, one thing you could do is create the image you want and
>> transfer it to 3M's INT ("Image 'n Transfer") film to create
>> a dry-transfer image of just what you want.   Seems like a
>> rather convoluted way to do it, but it would get around the
>> problem you mention.
>>

>Could you give a bit more detail of the INT film, Tom?

>Thanks!

>Mark
>G0WLR
if you are also into Photography you might look into a product called Liquid
Light. It's a Liquid Photo Emulsion which you can apply to almost ANY surface
expose as if it were photo paper develop and fix and have a permenant image
after applying clear Laquer. I know "How do I get the negative?" easy you can
do it several ways such as Drawing it and taking a Photograph of it then use
that negative. If you have no Enlarger still no problem if you have a good
Laser Printer, 300 DPI is ok tho the newer 600 DPI printers are better. Get
yerself some Transparency Film made for Laser Printers and draw up the display
in yer fave DTP prg then print it on the Transparancy film scaled 1 to 1
then simply do a "Contact" print by placing the Transparency film "Negative"
over the panel which has already been treated with the liquid light emulsion.
Turn on a Standard Incandescent Bulb on then off quickly and develop and fix.
Voila'! Works great, I've done it, a bit grainy with my old 300 DPI Laser
printer but for Text and a logo should be fine. Same Company also makes Silk
Screening supplies as well. Company name is Rockland Colloid Corp in Piermont
NY 10968 but any well stocked Photo shop should carry it. B&W developing is
VERY easy too in a case like this.


<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Sun Apr 28 13:11:46 1996
From: Mark Mandelkern <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Repeater
Date: 25 Apr 1996 18:15:50 GMT
Message-ID: <4lofgm$[e-mail]>
References: <4ln4jg$[e-mail]>

QEX, Feb. 1996, has an article about making a repeater from two HTs.

73, Mark    KN5S

--
Mark Mandelkern
Las Cruces, New Mexico, USA

[e-mail]




From [e-mail] Sun Apr 28 13:11:47 1996
From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RFI from linear amp
Date: Sun, 21 Apr 1996 14:44:02 -0700
Message-ID: <[e-mail]>
References: <4lc05i$[e-mail]>

Doug Brede wrote:
>
> I've got a homebrew linear using a pair of 3-500Z tubes.  Lately I've
> noticed some RFI being generated from it -- a S2 hiss across the bands
> above 40 meters.  This hiss occurs on receive only when the high voltage
> is on, making me think that it is a diode in the HV supply.
>
> Does anyone know a way to spot the offending diode without replacing the
> whole bunch?  I don't really want to poke around in a 4 kv supply when
> it's on.  Ideas?
>
> Doug W3AS

Hi Doug,

  Make sure that the 3-500's are fully CUT OFF during receive (ie,
drawing NO plate current).  Idle plate currant can make a nice wideband
noise generator (this is the basis of one kind of noise generator in
fact).
  73, GL
      Don, W6JL


From [e-mail] Sun Apr 28 13:11:48 1996
From: Brian Olliver <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RFI from linear amp
Date: Mon, 22 Apr 1996 01:23:01 +0100
Distribution: world
Message-ID: <[e-mail]>
References: <4lc05i$[e-mail]>

In article <4lc05i$[e-mail]>, Doug Brede
<[e-mail]> writes
>I've got a homebrew linear using a pair of 3-500Z tubes.  Lately I've
>noticed some RFI being generated from it -- a S2 hiss across the bands
>above 40 meters.  This hiss occurs on receive only when the high voltage
>is on, making me think that it is a diode in the HV supply.
>
>Does anyone know a way to spot the offending diode without replacing the
>whole bunch?  I don't really want to poke around in a 4 kv supply when
>it's on.  Ideas?
>
>Doug W3AS
>

-hello doug
this ones an old timer, i think you will find that the hiss is created by
secondary emmision i.e. the cloud of electrons straying from the anode/s
- you have in effect a broad band noise diode, remove the ht or change the
biasing arrangement
hope this was the answer 73's g8dqq
Brian Olliver


From [e-mail] Sun Apr 28 13:11:49 1996
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RFI from linear amp
Date: 24 Apr 1996 22:45:24 -0400
Message-ID: <4lmp04$[e-mail]>
References: <4lhr62$[e-mail]>

In article <4lhr62$[e-mail]>,
[e-mail] (WB3U) writes:

>
>This is probably the result of diode noise generated in the tubes
>themselves.  However, it's rare in my experience to encounter this
>except when an electronic T/R switch is in use.
>
>Maybe you could describe the setup in more detail, particularly the
>means used to implement T/R switching?  Do you cut off the tubes in
>receive, or do they draw idling current all the time?  Also, how is
>your antenna system being fed?
>
>73,
>Jack  WB3U
>
>

Another source of hissing is corona in the HV transformer or related
components. In that case, it is a sign of impending disaster.

Usually it is shot noise in the tube, but it is very unlikely it would be
loud enough to hear if the relay is working correctly and disconnecting
the tank.

Perhaps he is using an electronic TR switch?

73 Tom


From [e-mail] Sun Apr 28 13:11:50 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Selling VT-4-C transmitting tubes
Date: Mon, 22 Apr 1996 06:27:38 GMT
Message-ID: <4leu4v$[e-mail]>

I have two brand-new VT-4-C transmitting tubes.  Interested? email me.
AIRWICK



From [e-mail] Sun Apr 28 13:11:51 1996
From: Greg Lohstroh <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: SMD relacement for Amidon coil
Date: Fri, 26 Apr 1996 08:35:28 -0400
Message-ID: <[e-mail]>

 I don't know if any of you saw the "Micronaunt" project in the April 96
edition of CQ mag. But,I would like to make this project using SMDs.The
problem is that I don't know if the Amidon coil which is 12 turns of #28
on an Amidon T-50-2 core can fit in the project box I have intended (REAL
small!) this coil should be .720 uH.Can I use a surface mount coil here?
         Thanks.
                  Greg



From [e-mail] Sun Apr 28 13:11:51 1996
From: [e-mail] (Jonny)
Newsgroups: rec.radio.amateur.homebrew
Subject: Vic D. ex of Screamin' Black Cadillacs -- read this
Date: Sun, 21 Apr 1996 01:58:23 EST
Message-ID: <[e-mail]>

 Hey Vic,
     How's dentist college?!?  I thought that I'd be able to catch you on one
of these news groups!  Paul W told me that you'd stopped playing your upright
-- the neck had cracked.  Could you ever dare to part with it?  By the way,
its me Jonny from St. Kitts.   e-mail is [e-mail]


From [e-mail] Sun Apr 28 13:11:52 1996
From: "Steve Fuller, KB5FIP" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Want Mods for the Alinco DR-610T
Date: Thu, 25 Apr 1996 10:10:42 -0600
Message-ID: <[e-mail]>

Does anyone know what the mods are for the Alinco DR-610T?

Steve Fuller
KB5FIP
email address:  [e-mail]
Bus. phone:  [phone]
home phone:  [phone]


From [e-mail] Sun Apr 28 13:11:53 1996
From: Mark Pettigrew <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: RS232 to TTL
Date: Thu, 25 Apr 1996 10:40:23 -0700
Message-ID: <[e-mail]>
References: <[e-mail]>

Ricky Scott wrote:
>
> Im looking for a RS232 to TTL converter that I could use with my ICOM 735
> to control its functions.  Anyone have a quick and dirty Schematic or an
> article I could Find (No Commercial Boxes please).

Don't have an answer as you ask, but there is a posting to the
rec.radio.amateur.equipment newsgroup from Tony Salvador, N5GPI, pointing
to the FT-736R CAT section on his page. He says that the unit is usable
on all rigs that require a RS-232 to TTL level converter to control
the rig. Kits include all connectors needed for connection to Kenwood,
Yaesu or Icom rigs and as well as others.

http://www.gcr1.com/n5gpi/

Mark
G0WLR


From [e-mail] Sun Apr 28 13:11:56 1996
From: Charlie Panek <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: RS232 to TTL
Date: Wed, 24 Apr 1996 10:18:38 -0700
Message-ID: <[e-mail]>
References: <[e-mail]>

This is a multi-part message in MIME format.

--------------56595F135C26
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Ricky Scott wrote:
>
> Im looking for a RS232 to TTL converter that I could use with my ICOM 735
> to control its functions.  Anyone have a quick and dirty Schematic or an
> article I could Find (No Commercial Boxes please).
>
> --
> Ricky J. Scott

This one comes up every so often, so I thought I might as well post
my little circuit, rather than just email it to Ricky.  I think you'll
agree that this is about a simple as it gets!
--
Charlie Panek                   Hewlett Packard Company
[e-mail]            Lake Stevens Division
                                Everett, Washington

--------------56595F135C26
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="civ.info"

         The tightwad's ICOM CI-V interface:
DB-9F
                                       +9V
                                       ___
pin    CR1                              |
 4 >--->|--------------------------------
       CR2          |    |          |
 7 >--->|------------   ___         |
                        ___ C1     ___
                         |        | R2|
                        GND       |___|
                                    |
                                    |
                                    |
              C/---------------------------------------------> to IC-735
             |/                         |          |      ---<
 3>---|R1|---| Q1                       |          |      |
           | |\                        ___/        |     GND
           |  E\          +9V         / ^  CR4     |
       CR3___   |         ___           |          |
           ^    |          |            |          |
           |   GND        ___          GND         |
           |             |R5 |                     |
          GND            |___|                     |
                           |                       |
 2>-------------------------\C                     |
                             \|                    |
                         Q2   |-------------|R3|---|
                             /|     |
                            /E     ___
 5>---                     |      |R4 |
     |                     |      |___|
    GND                   GND       |
                                    |
                                   GND

Parts List:

  C1: .1 uf ceramic cap.

  CR1,CR2,CR3: 1N914, or just about any silicon diode, good for 25V, 100mA.

  CR4: 5.1V Zener diode.

  R1,R2: 10K ohms

  R3,R4: 47k ohms

  R5: 1.5k ohms

  Q1, Q2: 2N3904 or just about any small signal, NPN switching transistor.

Note that no external power is required, if the software supports it.
If the software drives pins 4 or 7 of the DB-9 high, they will supply the
voltage to run the interface.  If the software doesn't do this, connect
a 9V battery or other supply to the +9V node.

Note also that this interface will work fine with *most* PC's, even though
it doesn't generate "true" RS-232 voltage levels.  It's a little known fact
that most RS-232 circuits actually have an input switching threshold of
about +1V, and will respond just fine to TTL levels. (e.g. the MC1489
chip.)  I haven't encountered any that won't work, though, in my limited
experience.

--------------56595F135C26--



From [e-mail] Sun Apr 28 13:11:57 1996
From: [e-mail] (Christer Johansson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: RS232 to TTL
Date: Thu, 25 Apr 1996 17:57:58 GMT
Reply-To: [e-mail]
References: <[e-mail]>
Message-ID: <[e-mail]>

[e-mail] (Ricky Scott) wrote:

>Im looking for a RS232 to TTL converter that I could use with my ICOM 735
>to control its functions.  Anyone have a quick and dirty Schematic or an
>article I could Find (No Commercial Boxes please).

Take a look at MAX232 from Maxim, it's an IC but only needs four 0.1uF
caps and +5 VDC to run. There are several other models of RS232 to TTL
but this one is popular...

Regards,

/Christer

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon  -  Christer Johansson  -  E-mail: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
     >>  World Wide Web On-Line Catalog - http://www.hth.com  <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Sun Apr 28 13:11:58 1996
Newsgroups: rec.radio.amateur.homebrew
From: "R.J. Scott" <[e-mail]>
Subject: Re: Wanted: RS232 to TTL
Message-ID: <Pine.SUN.3.91.960425060820.4056A-100000@bcstec>
References: <[e-mail]> <[e-mail]>
Date: Thu, 25 Apr 1996 13:09:10 GMT


Thanks anyway Mark.  But that is a commercial box and I want to build my
own. I have several leads. But again thanks for the note, its all usefull.

Ricky J. Scott

I dont speak for my company and they do not speak for me
We like it that way and so do their Lawyers.



From [e-mail] Sun Apr 28 13:11:59 1996
Newsgroups: rec.radio.amateur.homebrew
From: "R.J. Scott" <[e-mail]>
Subject: Re: Wanted: RS232 to TTL
Message-ID: <Pine.SUN.3.91.960424113045.1470E-100000@bcstec>
References: <[e-mail]> <[e-mail]>
Date: Wed, 24 Apr 1996 18:31:46 GMT


That is exactly what I was looking for. Just somthing to play with.  Ill
get the RS232 chips and build a better one later but that simple one is
just the ticket to see if I can make the program talk to the 735.
Charlie you is a saint.

Ricky J. Scott

I dont speak for my company and they do not speak for me
We like it that way and so do their Lawyers.



From [e-mail] Mon Apr 29 16:42:03 1996
From: [e-mail] (Donald E. Turner)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-1000A Grid Driven
Date: 28 Apr 1996 06:52:21 GMT
Message-ID: <4lv4j5$[e-mail]>

I'm considering an amplifier using the old 4-1000A, mostly because I have
two of them.  One of the disadvatages of these tubes is lower efficiency
at plate potentials of 3kV and lower. Most designs use these in cathode
driven configurations, probably because of circuit simplicity. I'm
considering running one in a conventional grid driven mode in AB2.
According to Eimac spec's a pair runs 3000 watts output with 4kV Vp,
(I)idle 300mA & 1.2 A running, 500V Vscreen, -60 Vgrid and 140 Vpeak grid
drive. Of course, a single would put out 1500 with half the idle and
running current.

A passive input circuit has definate advantages. It requires NO tuned
circuits and is very stable because everything is a low impedance to
ground. Most of the time one sees this approach with Eimac external anode
tubes, probably because of their lower control grid bias requirements. If
one does the math for 140 peak (peak drive req'd 4-1000A in AB2), the RMS
drive required with a 100 ohm passive input (not a bad match) is 138
watts. This is right in the ball park for most exciters and transcievers.

The trade-off in this approach is building screen and bias supplies, but
NO input tuned circuits, input bandswitch and bifilar wound filament
choke. The drive requirement is roughly the same as in the cathode driven
configuration.

The question is simple.  Does anyone have thoughts or experience as to
this approach with this tube. Send some mail if you have thoughts.



From [e-mail] Mon Apr 29 16:42:05 1996
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone have Amidon phone number?
Date: Sun, 28 Apr 96 10:03:38 GMT
Message-ID: <[e-mail]>
References: <[e-mail]> <4lo1cv$[e-mail]>
Reply-To: [e-mail]

In article <4lo1cv$[e-mail]>
           [e-mail] "robert bowman" writes:

> In article <[e-mail]>,
>  [e-mail] (Bill VanRemmen) says:
> >
> >Does anyone have the phone number, address or 'net address of Amidon
> >Associates?
>
> it was:
> PO Box 956
> Torrance, CA 90508
> 310-763-5770

The '96 ARRL Handbook gives:

        Amidon, Inc.
        3122 Alpine Avenue
        Santa Ana, CA 92704
        714-850-1163

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


From [e-mail] Mon Apr 29 16:42:05 1996
From: [e-mail] (David MEDLEY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Calling Australia
Date: Mon, 29 Apr 1996 01:38:12
Message-ID: <4m1hpi$[e-mail]>

I would like to hear from any homebrewers in Australia. I need some
help in procuring parts for a project I am working on.
Lets hear from you Mates
Regards
Dave Medley

David Medley



From [e-mail] Mon Apr 29 16:42:07 1996
From: [e-mail] (Jack Yazel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Code practice tapes and oscilator needed
Date: 28 Apr 1996 15:20:07 -0400
Message-ID: <4m0gd7$[e-mail]>
References: <4lu460$[e-mail]>

Bill Johnson ([e-mail]) wrote:
: I am interseted in learning Morse code and becoming a ham. I'm disabled
: and on a fixed income, so I cannot afford to pay much for them, but I
: would like to find a set of instruction tapes, as well as a practice
: oscilator and key. If anyone has these items that they would be willing
: to part with at a reasonable price, please let me know. I would really
: appreciate it.

: Thanks,
: Bill
: [e-mail]

   Why not use a computer program to practice with. It works very much
 like tapes and the cost is reasonable.

   If you can FTP, get Super Morse at:

       oak.oakland.edu
             /pub3/hamradio/arrl/bbs/vec    filename: sm415.exe

   If you need any help using FTP, email me and I will give you some
  tips.

          Jack,  W8RAG


From [e-mail] Mon Apr 29 16:42:08 1996
From: [e-mail] (Donald E. Turner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Fluorinert?
Date: 28 Apr 1996 07:15:52 GMT
Message-ID: <4lv5v8$[e-mail]>
References: <4lrink$[e-mail]> <4lsopn$[e-mail]>


>3M makes Fluorinert.  In fact, fluorinert is trademarked by 3M.  Be
>sure your wearing your seatbelt when they tell you the price!  The
>substance is expensive!  The bags of flourinert made by 3M are called
>"Liquid Heatsink".  They work quit well, but again they are expensive.
>

This would make wonderful stuff for cooling water cooled tubes with
something that has very high dielectric strength and is practically an
OPEN in terms of resistivity. Wonder if a guy could buy some in small
quantities? We use some at work, and you are right, the price is heart
stopping! Its' on the order of $400 per gallon!



From [e-mail] Mon Apr 29 16:42:09 1996
From: [e-mail] (robert bowman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM Band Code Practice XMITTER- Help!
Date: 28 Apr 1996 02:43:37 GMT
Message-ID: <4lum0p$[e-mail]>
References: <[e-mail]> <4lnqrl$[e-mail]>

In article <4lnqrl$[e-mail]>, [e-mail] (Marcum N. Nanc
e III) says:
>>You could use the AC wiring as the antenna (using caps of say .01 or .01 in
>I may be missing something but it seems a bit dangerous...

not really. the cap is isolating you from the ac, since it presents
a high impedance at 60 hz.

>Wireless intercoms that use the AC lines for their connection... can
>they be used in a simular manner if people attach a receiver to the ac
>lines?

yes, if i understand your question. that is how they work. there have
been a number of schemes for putting a low frequency (30 khz, say) signal
on the ac lines for switching or intercomm purposes. the biggest problem,
if you are looking for reliability, is all the other stuff, like fork
lift battery chargers, etc, that are also putting a signal on the lines.
but for casual morse code practice, it shouldn't be a problem.


From [e-mail] Mon Apr 29 16:42:10 1996
From: Spencer Petri <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS:HV PS DIODES
Date: 27 Apr 1996 14:05:09 GMT
Message-ID: <4lt9il$[e-mail]>

These are great. 25KV and I tested them for 1.38 Amps for 4 hours. These
babies can take it. $10 each or build a bridge for $35. You ship.

73 de Pete WA5JCI



From [e-mail] Mon Apr 29 16:42:11 1996
From: [e-mail] (clyde edgar)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.components
Subject: Help ID These
Date: Sun, 28 Apr 1996 23:51:50 GMT
Message-ID: <4m140i$[e-mail]>
Reply-To: [e-mail]

Does anyone have any info on a Mitsubushi MD003,  it is a 7 pin inline
package that apparently switches RF. Also I have a varian/beverly
VMC-1680. It has a single SMA output and a three wire input, red
,black, grey. The wires appear to have 5K shunted by a capacitance
when measured with an ohmmeter. I applied between 5 and 15 volts DC to
the red and black leads but no RF out.         Tnx Again,  Clyde
WA6DCM



From [e-mail] Mon Apr 29 16:42:12 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Re: Icom IC-215 for Marine use?
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Sun, 28 Apr 1996 20:14:37 GMT

>SARUMAN wrote:
>>
>> Yup it's me again with another question. Anyone know if it's possible to
>> use the Icom IC-215 to Tx/Rx on the Marine Bands? If no does anyone know of
>> a mod to allow this? Thanx folks Hoping that it's simply a matter of
>> installing Crystals but doubt it

>Don't know if there is a mod or not, but it should be stressed that
>any equipment not designed for, and type-accepted, for marine use
>is ILLEGAL to operate there. Emergency use aside, it's just not allowed.
>Marine gear has very tight frequency stability and accuracy
>specifications, specific power levels, and spectral purity requirements.



>--
>George J. Molnar
>Highlands Ranch, Colorado
>Amateur Radio: KF2T@N0QCU.#NECO.CO.USA.NOAM
>http://www.interealm.com/p/gmolnar/index.html

I guess that idea is a bust then. Thanx for the info.

<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Mon Apr 29 16:42:13 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (SARUMAN)
Subject: Re: Looking for info on QRP 6 meter circuits
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Sun, 28 Apr 1996 20:14:25 GMT

>me too...
CQ magazine recently had an article on 6 meter Reciever based on a Motorola IC
MC-3367(mighta been 3667) was pretty str8 forward looking. They also mentioned
in that article a previous artcle on the Transmitter. I think it was the
February issue.


<tsb>
                               Midgard Graphics
           3D Animation and Special FX for the hobbyist videographer
                          Email: [e-mail]

--
          Drop into #amigacafe on IRC's undernet for a chat sometime

--

<tsb>

                     A man of many hobby's master of none.




From [e-mail] Mon Apr 29 16:42:14 1996
From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Phone In-Use Light
Date: 27 Apr 1996 19:55:55 -0700
Message-ID: <[e-mail]>
References: <[e-mail]> <Pine.SOL.3.91.960426133224.14279C-100000@topeka>

In article <Pine.SOL.3.91.960426133224.14279C-100000@topeka>,
Michael Blankenship <mblank@topeka> wrote:
>
> On Thu, 25 Apr 1996, DAVE.FORMILAN wrote:
>
> > Does anyone a nifty circuit for a phone in-use indicator. The indicator
> > can be LED, neon or whatever. I just need something to light at each of
> > my phones that would tell the would-be phone user that the phone line is
> > being used.
> >
> > I lose more connections to the Internet when either my wife or daughters
> > picks up the phone and says sorry.
> >
> > I sure someone must have solved this problem without major rewining or
> > adding a dedicated line.
> >

I my office I just connect a volt meter across the phone lines.  If it
says ~48 V, line's available; less than 10 V, busy!  Simple.

73,

---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'
Remembering: KE6LTH, KD6HNU, March 22, 1996


From [e-mail] Mon Apr 29 16:42:15 1996
From: [e-mail] (Eugene Welcome)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Phone In-Use Light
Date: Sun, 28 Apr 1996 05:12:25 GMT
Message-ID: <[e-mail]>
Distribution: world

Hi Dave, I am responding via E-Mail a solution and I didn't want to post
a iffy?? off topic here. I have had some E-Mail not get through and let
me know either here or return answer my E-Mail message. I can re-post it
to another conference that deals with phones.

                       _   /|
                       \'o 0'
73, Gene, K7"EEK" !! a =(_"_)= ?? He ate my Mouse !
                          U
[e-mail]