World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_02/_homebre.txt

Text File | 1997-02-01 | 669KB | 17,174 lines

The World of Ham Radio CD-ROM



From [e-mail] Mon Feb 05 21:42:22 1996
Path: news.epix.net!news.sprintlink.net!news.icanect.net!news
From: Eliot Fenton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: Thu, 01 Feb 1996 01:38:19 -0800
Organization: Internet Communications of America
Lines: 12
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References: <4emtge$[e-mail]> <[e-mail]>
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> There is a chip that does what you want. Sorry, can't think of the
> manufacturer. Ramsey sells two complete kits that uses it and does what you
> want. I've seen the chip sold separatly but can't find a listing in a catalo
g
> just for the chip at the present time.

Drew:

Thanks for the reply.  I've heard of Ramsey, but have never bought from them.
 Do you have a
phone number so I contact them?

Eliot Fenton
[e-mail]


From [e-mail] Mon Feb 05 21:42:23 1996
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From: Gary Davidson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED CENTRAL ELECTRONICS 20-A  COMPONENTS
Date: 1 Feb 1996 01:53:34 GMT
Organization: North Bay Network, Inc. news server - not responsible for content
Lines: 7
Message-ID: <4ep6eu$[e-mail]>
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I need the VFO for a CE 20-a, a very professional grade, 10 meter capable
unit, please, and also the plug-in antitrip module - sure would like to
get this rig back on the air!

Gary, KJ6Q, KJ6Q@WA6HAM (packet) [e-mail], or 707-448-5221.
Vacaville, ca.



From [e-mail] Mon Feb 05 21:42:24 1996
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From: [e-mail] (Kenneth Burtchaell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Printer generated transparency problem
Date: 1 Feb 1996 02:13:04 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 7
Distribution: world
Message-ID: <4ep7jg$[e-mail]>
NNTP-Posting-Host: inugap3.news.prodigy.com
X-Newsreader: Version 1.2

I am experiecing difficulty in getting a good solid blackening in the
solid trace areas of PCB layout transparencies on my Okidata OL400
printer.It has been suggested to me that this might be a electro static
induced problem . Anybody have any good ideas?

      73 Ken W6GHV



From [e-mail] Mon Feb 05 21:42:25 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TA7204 audio amp chip
Date: Thu, 01 Feb 96 03:21:54 GMT
Lines: 18
Message-ID: <[e-mail]>
References: <4eqh0o$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Jurg L. Jaggi) wrote:

>I recently got a Kyokuto FM144-10SXRII radio. Unfortunately, the audio
>amplifier chip is defective and needs to be replaced. It is labelled
>TA7204.

The TA7204 is a common audio amplifier IC used in many types of
Japanese audio equipment, particularly automobile stereos.  The chip
is still available, listed for sale at $10.44 from MCM Electronics.
MCM has a $20.00 minimum order, but will ship smaller orders with a
$5.00 service fee.  Their phone for orders is [phone].

Alternately, you might also try a few local stereo repair shops to
see if any of them stock this part.

73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:42:26 1996
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From: rew5808 <[e-mail]>
Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: WTB: lafayette, allied electronics & heathkit catalogs
Date: 1 Feb 1996 05:12:37 GMT
Organization: PrismNet - (512)-418-1568
Lines: 7
Message-ID: <4epi45$[e-mail]>
References: <[e-mail]> <4ehl14$[e-mail]>
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I am looking for some lafayette radio, allied electronics, and heathkit
catalogs from 1957 thru 1965.
would appreciate any help and/or any leads you can give me.

thanks
bobby  wb5wur



From [e-mail] Mon Feb 05 21:42:27 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!uunet!in2.uu.net!ferengi.prismnet.com!usenet
From: rew5808 <[e-mail]>
Newsgroups: rec.radio.amateur.swap,rec.radio.amateur.misc,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: WTB: lafayette, allied electronics & heathkit catalogs
Date: 1 Feb 1996 05:51:45 GMT
Organization: PrismNet - (512)-418-1568
Lines: 9
Message-ID: <4epkdh$[e-mail]>
References: <[e-mail]> <4ehl14$[e-mail]> <4epi45$[e-mail]>
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I am looking for some lafayette radio, allied electronics, and heathkit
catalogs from 1957 thru 1965.
would appreciate any help and/or any leads you can give me.

thanks
bobby  wb5wur





From [e-mail] Mon Feb 05 21:42:27 1996
Path: news.epix.net!news.sprintlink.net!news.comm.net!imci3!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!ferengi.prismnet.com!usenet
From: rew5808 <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: wtb: allied, lafayette, heathkit catalogs
Date: 1 Feb 1996 06:06:59 GMT
Organization: PrismNet - (512)-418-1568
Lines: 7
Message-ID: <4epla3$[e-mail]>
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i would appreciate any help i can get in locating some spare lafayette
radio/electronics, heathkit, or allied electronics catalogs from 1957
thru 1965.

thanks
bobby  wb5wur



From [e-mail] Mon Feb 05 21:42:29 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip51.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: Thu, 1 Feb 1996 07:03:19 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 30
Distribution: world
Message-ID: <[e-mail]>
References: <4enu4k$[e-mail]> <4eqdr2$[e-mail]>
NNTP-Posting-Host: usr7ip51.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4eqdr2$[e-mail]> [e-mail] (Bob Lombardi) writes:
>From: [e-mail] (Bob Lombardi)
>Subject: Re: PTO Temperature Compensation
>Date: 1 Feb 1996 13:05:38 GMT

>WB3U ([e-mail]) wrote:
>: I have four identical PTO's in solid-state rigs that I've been trying
>: to stabilize, with only limited success.  Maybe someone with more
>: experience in this area can help me with this.

[snip]

>Perhaps someone in the crystal business will tell you how they make a
>TCXO, but the basic process is to match the exact crystal variation
>over temp with an inverse variation in the circuit.  You can tune a
>varactor across the crystal with thermistors.  The same approach may
>work for you.  You have to test the oscillator over temperature and
>find out how much it drifts, then figure how much C you need to pull
>it in, what voltage to drop in thermistors, etc., etc..  To do this
>productively, like at a crystal oscillator house, you need to have
>experience, good measurement equipment and probably curve-fitting
>software (I'd guess).

Jack a good reference on this is: Crystal Oscillator Design and Temperature
Compensation" by M. E. Frerking.

The subject is also mentioned in: "Single Sideband Systems & Circuits", Bill
Sabin, Editor.

73, Wes -- N7WS


From [e-mail] Mon Feb 05 21:42:30 1996
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From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Printer generated transparency problem
Date: Thu, 01 Feb 96 09:14:25 PDT
Organization: Northwest Nexus Inc.
Lines: 23
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References: <4ep7jg$[e-mail]>
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In article <4ep7jg$[e-mail]>,
<[e-mail]> writes:

> I am experiecing difficulty in getting a good solid blackening
in the
> solid trace areas of PCB layout transparencies on my Okidata
OL400
> printer.It has been suggested to me that this might be a
electro static
> induced problem . Anybody have any good ideas?

>

>       73 Ken W6GHV
Hi Ken, well that is certainly an interesting problem.  I hope
you get some help with it and post it to the group.  I've had
the same problem with my HP Laserjet IIP using one of the films
sold for that purpose.  I eventually gave up because the traces
always ended up badly pitted from all the little pinholes.

73 de KI7RH



From [e-mail] Mon Feb 05 21:42:31 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: rf circuit simulation
Date: 1 Feb 1996 09:48:16 GMT
Organization: The University of Waikato
Lines: 6
Message-ID: <4eq290$[e-mail]>
NNTP-Posting-Host: 166.83.104.17
X-Newsreader: AIR News 3.X (SPRY, Inc.)


        Are the spice rf models available in the public domain What else is available

freely for simulation of rf circuit designs?

        Thanks



From [e-mail] Mon Feb 05 21:42:32 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!oleane!jussieu.fr!citi2.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!newshost.vu.nl!cs.vu.nl!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: 82 Repeater in Kansas City/Repeater Use
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]> <[e-mail]> <4elgqo$[e-mail]>
Date: Thu, 1 Feb 1996 10:20:31 GMT
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In <4elgqo$[e-mail]> [e-mail] (Mark Fellhauer)
 writes:

>[e-mail] (Rob Janssen) wrote:

>>In <[e-mail]> Eddie Caffray <[e-mail]> wri
tes:

>>> On the 146.85 repeater here in Central NY we had trouble with one user als
o. He made it that
>>>no one would even monitor the reapeater anymore. The club voted to ban him
and we did. The
>>>reapeater is a great place to be again.

>>How do you manage to effectively ban malicious users from a repeater?
>>Of course this problem is known all over the world, but at least over
>>here we have not yet found an effective way of stopping them.  How do
>>you do that?

>Go to the Arizona Repeater Association's Home Page to see how this is
>done.  It involves actively pursuing people who engage in such
>activity.  The ARA, as a matter of routine, has an interference
>committee dedicated to tracking these people down.

>Despite reports to the contrary, the FCC does frown on this activity,
>and will enforce sanctions.  Just ask the people here in Phoenix about
>that.  An NAL, Notice of Apparant Liability, carries a stiff monetary
>fine, about $20,000 (US) worth and forfeiture of ALL broadcasting
>equipment and license(s).

Hmmm...   it looks like HDTP (or equivalent of the FCC) does not put
out such drastic sanctions.
Normally one will lose the license for a year or so, and one could get
a fine of maybe $500.

This does not seem to stop some people...   when you have been reading the
BBSes, you can see that the wellknown person that causes havoc on the
local packet network is still active.  He is fully known by name,
ex-callsign, and address.
(he just uses callsigns of other people, mainly VERON officials, to
post offensive messages.  he was also active on the phone repeater sometime,
transmitting over those same people, but I think he has lost interest in that)

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Mon Feb 05 21:42:34 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!tank.news.pipex.net!pipex!oleane!jussieu.fr!citi2.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!newshost.vu.nl!cs.vu.nl!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: 82 Repeater in Kansas City
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Date: Thu, 1 Feb 1996 10:22:49 GMT
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In <[e-mail]> [e-mail] (Donald
 I. Baker) writes:

>Technical solutions do exist.  Using a "TX-ID" board, which uniquely
>fingerprints each transmitter and a PC one can "slectively" include or
>preclude individual users.

>The board was not meant for that purpose, but with just a little Basic of C
>codes, it workd just fine.  It is especially easy if you have a single or
>limited number of receive site.

Is that using some public key encryption technique?
If not, what is preventing the malicious from cloning one of the
apparently valid codes?

Also, what is preventing the malicious user from just keying up over
other people's transmissions, thus rendering the repeater useless?

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Mon Feb 05 21:42:35 1996
Path: news.epix.net!news.sprintlink.net!news-res.gsl.net!news-dc.gsl.net!news-lond.gsl.net!Tagada.grolier.fr!rain.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!panix!not-for-mail
From: [e-mail] (Michael Schuster)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.scanner
Subject: Re: need 10 to 150 khz FM demodulator
Date: 1 Feb 1996 11:10:09 -0500
Organization: panix
Lines: 18
Message-ID: <4eqol1$[e-mail]>
References: <4eomvr$[e-mail]>
NNTP-Posting-Host: panix3.panix.com
Xref: news.epix.net rec.radio.amateur.homebrew:13077 rec.radio.scanner:44848

In article <4eomvr$[e-mail]>,
Bruce M. Marshall <[e-mail]> wrote:
>Does anyone know of a chip that is used to demodulate multiplexed
>signals such as FM sterio, secondary audio programming (SAP) on TV
>sound and SCA on FM broadcast? I thought I could use my HF radio in FM
>mode but I tried it and it didn't work. I finally figured out that
>although the readout goes down to 0 hz it actually won't receive
>anything less than 150 khz (the manual says so and I can hear the
>relay click out.)
>I'm sure there is a small, easy circuit to do this.

Get a VLF converter, such as the ones made by Datong or Palomar Engineers,
and put it in the antenna path.


--
Mike Schuster       |        [e-mail] | [e-mail]
------------------- | [e-mail] | [e-mail]


From [e-mail] Mon Feb 05 21:42:37 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1600B Amp.
Date: 1 Feb 1996 11:32:54 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <4eqpvm$[e-mail]>
References: <4eqj7f$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

I have some questions. Does this circuit contain screen protection and
voltage regulation in the screen and control grid?

73 Tom


From [e-mail] Mon Feb 05 21:42:38 1996
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From: [e-mail]
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MIL VCO
Date: Thu, 01 Feb 1996 12:31:49 GMT
Organization: World-Net information exchange, Internet provider.
Lines: 14
Message-ID: <4eqc3a$[e-mail]>
References: <4el6f3$[e-mail]> <[e-mail]>
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Xref: news.epix.net sci.electronics.components:1805 rec.radio.amateur.homebrew:13070

Hi Jon

>  Avantek was acquired by Hewlett Packard.  You can still get an catalog of
>  the Avantek products, but you'll have to contact HP for it.

Thanks for answer. I will try to get the right entry to HP because
when I called HP, here in France, I found only informatic division and
they don't know other division !


Have
a nice                    [e-mail]
Day



From [e-mail] Mon Feb 05 21:42:40 1996
Path: news.epix.net!news.sprintlink.net!cc.iu.net!bb.iu.net!blombard
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: 1 Feb 1996 13:05:38 GMT
Organization: InternetU, Inc., Palm Bay, FL
Lines: 77
Distribution: world
Message-ID: <4eqdr2$[e-mail]>
References: <4enu4k$[e-mail]>
NNTP-Posting-Host: bb.iu.net
X-Newsreader: TIN [version 1.2 PL2]

WB3U ([e-mail]) wrote:
: I have four identical PTO's in solid-state rigs that I've been trying
: to stabilize, with only limited success.  Maybe someone with more
: experience in this area can help me with this.

I have some experience with this, so perhaps I can help a little.

: First, the oscillator is a JFET in the usual Colpitts configuration,
: operating from 5.0-5.5 MHz.  From the factory, the two feedback
: capacitors are each 91 pf silver micas.  The inductor is paralleled
: with approximately 140 pf.  The latter is composed of three separate
: disc capacitors, ranging from N220 to N330 types.

much description deleted...

: If anyone has any suggestions or can point out an error in my
: thinking on this work, I would certainly appreciate it.

: 73,
: Jack  WB3U


Your thinking is okay, it's just a very thorny problem to solve in
real life.  Think of it in terms of PPM: at 5 MHz, a cheap crystal
oscillator (not compensated) will drift 250 to 500 Hz over temp.  To
get better than that you need better temperature compensation.

What you need to do is find out what is drifting, how much, and correct
it (like you didn't know that, right ;-).  That may mean that you
would have to measure specific temperature drifts on caps, and pick
particular caps.  That may mean, say, getting several 390 pf, N330 caps
and picking the one with the exact drift you need.  It's tedious, and
expensive.  I've only been marginally involved with this sort of thing,
but I know it takes time.

Ideally, if everything had a zero TC, nothing would change, and I like
the idea of NPO (COG) caps everywhere.  But if the inductor core is
what's drifting, your problem would get worse (I'll bet it is the
inductor).

Perhaps someone in the crystal business will tell you how they make a
TCXO, but the basic process is to match the exact crystal variation
over temp with an inverse variation in the circuit.  You can tune a
varactor across the crystal with thermistors.  The same approach may
work for you.  You have to test the oscillator over temperature and
find out how much it drifts, then figure how much C you need to pull
it in, what voltage to drop in thermistors, etc., etc..  To do this
productively, like at a crystal oscillator house, you need to have
experience, good measurement equipment and probably curve-fitting
software (I'd guess).

You could try a couple of other things they do in the crystal
business to get around the problem.  For example, if the oscillator
drifts versus temperature, you can fix its temperature.  Just make
sure it is held higher than the level it will see during operation.
(For example, if the circuit will see 130F, keep the oscillator at
140 or 150, just be sure to use some sort of thermostat).  You can
use resistors as the heating elements and wrap the whole thing in
insulation.  Another idea would be to lower the power output in the
oscillator, to keep it cooler, and use an amplifier after it to
get the signal back.  If the problem is heat from elsewhere, though,
this won't work.

Well, this is sort of vague, but I hope it helps.


73,
Bob


--
Bob Lombardi    WB4EHS  from Melbourne, FL    >>>>>  [e-mail]
The average male bicycle rider consumes 375 calories to ride 10 miles.
The average car uses 1/2 gallon of gasoline, or 18,600 calories, to go
the same distance.  -- from Bicycle Guide magazine, July 1994




From [e-mail] Mon Feb 05 21:42:41 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!news.net99.net!news.igc.net!news.zynet.com!ez0!pagesat.net!netserv.com!aimnet.com!news.exodus.net!uunet!in1.uu.net!iglou!iglou.com!n4lq
From: [e-mail] (Steve Ellington)
Subject: Re: Kit HF receivers
X-Nntp-Posting-Host: iglou
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Date: Thu, 1 Feb 1996 13:13:49 GMT
Lines: 7

TenTec has just released several nice receiver kits at very low prices.
Call them for a flyer.



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


From [e-mail] Mon Feb 05 21:42:42 1996
Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!msunews!netnews.upenn.edu!news
From: [e-mail] (Jurg L. Jaggi)
Newsgroups: rec.radio.amateur.homebrew
Subject: TA7204 audio amp chip
Date: Thu, 01 Feb 1996 13:59:42 GMT
Organization: University of Pennsylvania
Lines: 12
Message-ID: <4eqh0o$[e-mail]>
NNTP-Posting-Host: brain1.med.upenn.edu
X-Newsreader: Forte Free Agent 1.0.82

Hi folks,

I recently got a Kyokuto FM144-10SXRII radio. Unfortunately, the audio
amplifier chip is defective and needs to be replaced. It is labelled
TA7204. Are these chips (still) available? If not, what would be a
good choice for a replacement. Thanks for any help and/or advice to
get this radio going again.

73s,

Jurg KB2WKX



From [e-mail] Mon Feb 05 21:42:43 1996
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From: [e-mail] (COUGER GORDON)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec QEX "construction article??"
Date: 1 Feb 1996 15:20:05 GMT
Organization: CEAT at Oklahoma State University, Stillwater
Lines: 33
Message-ID: <4eqln5$[e-mail]>
References: <[e-mail]> <4eoq1i$[e-mail]>
Reply-To: Gordon Couger <[e-mail]>
NNTP-Posting-Host: master.ceat.okstate.edu

In article <4eoq1i$[e-mail]>,
Rand Gray <[e-mail]> wrote:
>Jay Wicklund made some comments about our article in QEX, as though
>there was no way of reproducing the design without purchasing one
>of our kits.
>
>We included in the article 100% of the board schematics -- what we
>omitted was the 179 page software listing, which was obviously
>inappropriate anyway.
>
>The design includes a DDS which is controlled either from a knob
>or a keypad, and includes switching control to support anyone's
>RF modules to make up to a 10-band radio.
>
>The bulk of the article most certainly is NOT a "kit review" as
>characterized by KI7RH.
>
I found the artical very informative. It shows the way a micro is intergrated
into a xciver. It provides the info nessary for me to build a radio not only
with the kit parts but also intergrating other stuff. I am not a fair test
as I write software for a living, but it was clear to me how to do it.

If I choose to build one I would like to look at the source code if available
to see how they did. I would do it to suit me in the end anyway.

Keep up this kind of artical.

Gordon AB5DG

   Gordon Couger
   Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075
   [e-mail] 405 744 8392 day 625-2855 evenings



From [e-mail] Mon Feb 05 21:42:45 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: PTO Temperature Compensation
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Thu, 1 Feb 1996 16:39:32 GMT
References: <4enu4k$[e-mail]>
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WB3U ([e-mail]) wrote:
: I have four identical PTO's in solid-state rigs that I've been trying
: to stabilize, with only limited success.  Maybe someone with more
: experience in this area can help me with this.


   It's quite easy to have mechanical expansion effects spoil the
stability of a PTO. I've come across ones where it changed everytime I
touched them. Look critically at their mechanical design...


: I decided to tackle the worst ones first, and I began by replacing the
: oscillator transistors with MPF102's.  This helped considerably.
: Next, following many, many hours of trial and error, I ended up
: replacing the silver micas with 100 pf polystyrene capacitors, and the
: remaining three compensation capacitors also with polystyrene units.


    That sounds sensible: get rid of the compensation then use low tempco
components everywhere to minimise drift, finally compensate the remaining
drift.




: Now the first two PTO's drift upward almost an identical amount, about
: 200-300 Hz during the same warmup period.  This may not sound like
: much, but the problem is that when the rig is used to transmit,
: chassis temperature quickly rises another 10 or 15 degrees.  This
: causes another drift to take place during the first hour or so of a
: QSO, and the drift amounts to approximately 200-300 Hz.  This occurs
: in addition to the longer-term warmup drift, and it takes place no
: matter how long the rig is powered on prior to the QSO.


    Note that polystyrene capacitors should never be taken above 70 C as
they undergo a permanent value change



: There's not much left for me to do, other than trying to find some
: type of linear, positive-coefficient capacitor.  Mallory does
: manufacturer them (disc type SL), but they're apparently difficult to
: come by.  Also, I've already spent a considerable sum on polystyrene
: capacitors and I'm reluctant to buy additional specialized capacitors
: after my results with the NPO's.


     You can go through a lot of components, also virtually nobody
nowadays uses controlled (non-zero) tempco capacitors, so finding them is
now virtually impossible.  Temp compensated ctrstal osc manufacturers use
thermistors and varactor diodes.

     Oxley used to make variable tempco capacitors for osc compensation,
but these are also like hen's teeth. I put a circuit for my favourite
easy-to-adjust  thermistor based compensator in the osc chapter in the
1995 and 1996 ARRL handbooks.

      Don't try compensation until you've weeded out any poor components,
remember that if you have signifiacnt temp changes, you need to make your
compensator and the thing that's being compensated heat and cool at the
same rates or else you get drift during temp CHANGE and recovery after
the change has stopped.


    Cheers
           David



From [e-mail] Mon Feb 05 21:42:46 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Dec QEX "construction article??"
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Thu, 1 Feb 1996 17:06:01 GMT
References: <4eoq1i$[e-mail]>
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Rand Gray ([e-mail]) wrote:


     I've not got that QEX yet, though I think I tried one out on my
spectrum analyser at the famous QRP vicarage (chez G3RJV), courtesy of
Sheldon Hands.  Sheldon had his proto transceiver along at the G-QRP
convention in October, and George G3RJV had bought a DDS unit from Sheldon
as a Christmas present, which those of us at the Christmas party had a
good play with....

     Very, very, nice indeed.

    One comment; I found a fair amount of processor related noise on the
DDS output co-ax coming down as (mostly) a common mode signal. Having a
transformer couple at one end of this cable, or else a ferrite sleeve
balun helps. This is nothing serious, it's roughly equal to the level of
the quantisation noise spurs, and might as well be eliminated as it's
easy enough to do....


: We included in the article 100% of the board schematics -- what we
: omitted was the 179 page software listing, which was obviously
: inappropriate anyway.


   It'd make a mess of QEX :-)

   It comes down to coercion. If you make the code available, a few
people will program their own CPUs, but the majority will opt for buying
PCBs and ready-blown chips.

   If you don't make the code available, you get loads of people upset
about the lack of a choice that they would probably not exercise anyway.

   What you don't want to happen, of course, is for someone else to take
your released code and go into business flogging programmed parts.

    As the software content of constructional projects is going to
continue to increase, I think some effort is needed to find a way round
this quandry. There have been some articles in QST where the code has
been kept private, and programmed parts made available only from the
author. No, it's not a matter of review articles, but I don't see how
they are not single-sourced kits with their *assembly instructions*
published in a magazine.


    I don't know of any solution to this problem, but I can see valid concerns
for both sides.


      Cheers
             David  GM4ZNX


From [e-mail] Mon Feb 05 21:42:48 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: Thu, 1 Feb 1996 17:51:03 -0800
Organization: Call America Internet Services  [phone]
Lines: 14
Message-ID: <[e-mail]>
References: <4enu4k$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4enu4k$[e-mail]>

Jack, in the your PTO temperature compensation problem there is something
that is fundamentally wrong in that these units never have need for
positive temperature compensation.  In fact, if you were to remove the
case from most any Collins PTO, there would be N100, N1500 and even N2200
ppm caps there!  I would first see that there is no mechanical binding
that would cause such problems.  Secondly, I suspect that you are
suffering from what I call "thermal delay"---that is the ability of the
temperature compensating capactior to be in the right physical position
to make timely change.  This becomes especially critical in units where
transmitting heat flows rapidly to the PTO.  The only solution is to
place the capacitor farther or closer to the heat source experimentally.
     With your call I suspect you have been around the barn as many times
as I, so I will limit comment to this since it might well be a refresher!
73  Cliff Buttschardt   W6HDO   Morro Bay, Calif


From [e-mail] Mon Feb 05 21:42:49 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!newsstand.cit.cornell.edu!news.tc.cornell.edu!newsserver.sdsc.edu!newshub.csu.net!newshub.sdsu.edu!ucsnews!sol.ctr.columbia.edu!news.uoregon.edu!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!news.physics.uiowa.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Date: 1 Feb 1996 18:27:25 GMT
Organization: Continental Cablevision
Lines: 11
Message-ID: <4er0md$[e-mail]>
References: <4e6tbm$[e-mail]> <4ee9o0$[e-mail]>
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To: [e-mail]

My favorite cleaner/lubricant for potentiometers and switch contacts was
manufactured by Daven.  I believe that Daven and Shallco were the sole
suppliers of ladder-type audio attenuators to the broadcast mixing
console industry (RCA, Gates, Collins, McMartin, etc.).

I still have an original container of "Daven Oil" for this purpose and
use it sparingly of course.  It's got to last me a lifetime!  Anyone else
remember using Daven Oil?

-Paul, N9AZ



From [e-mail] Mon Feb 05 21:42:50 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news1!ind-004-236-177
From: [e-mail] (Patrick Croft)
Subject: Re: WD-40 vice Contact/Tuner Spray!!
X-Nntp-Posting-Host: ind-004-236-177.iquest.net
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Sender: [e-mail] (News Admin)
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Date: Thu, 1 Feb 1996 19:50:44 GMT
Lines: 42

[e-mail] (W8JI  Tom) wrote:
>In article <4eiks1$[e-mail]>, James Garland
><[e-mail]> writes:
>
>>I've never had the nerve to try this technique.  I just can't bring
>>myself to dunk, say, my Central Electronics 100V in the bathtub and let
>>it soak. I'd be interested in knowing others' experience with this
>>cleaning method. Is it really necessary to remove the transformers? What
>>happens to the cardboard sleeves of IF transformers? Does it hopeless
>>ruin paper capacitors? Are there other precautions to take?
>>
>>Jim W8ZR
>
>A bubble bath may be the only way to clean the signal up an old
>boatanchor! (Just kidding Jim, I couldn't resist)
>
>Seriously. I use a quick soapy water bath, a water hose bath, then a
>distilled water bath, then I use an airhose to blow em out, then I let the
>rig dry under a heatlamp for a few days, and last I put a light coating of
>WD-40 in the right spots. I did that to a Ranger, DX-100 and an Apache.
>
>My rigs now look very clean and still work, only the signals are dirty.
>
>73 Tom
>
>
This is the basics to what Tektronix and HP  equipment went through.
Couple added steps included baking in an oven at 135 degrees for
about 30-60 min. after the bath.  The cleanser used was called 'Swipe",
and the currently marketed 'SimpleGreen' appears to be same stuff.
Of course all knobs and related parts should be removed and bathed
using an ultrasonic cleaner for best results - gets ALL the dirt out.  You
may need to remark pointer 'dots' or 'lines' - tire markers work great,
and available in various colors needed (white, red, yellow, etc).  One
point to watch - meters!  Some aren't sealed and bathing is a problem
for them.  Worth taking out and cleaning on the bench with a brush.
Also, keep a hair dryer handy - after blowing excessive water off, hit
with the hair dryer before baking.  A lot of test gear valued well above
any ham gear received this treatment and was resold as 'reconditioned'.
Good luck.

Patrick  WB9IQI


From [e-mail] Mon Feb 05 21:42:52 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!usenet
From: "Dana H. Myers" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec QEX "construction article??"
Date: 1 Feb 1996 19:52:40 GMT
Organization: Sunsoft, Los Angeles
Lines: 21
Message-ID: <4er5m8$[e-mail]>
References: <[e-mail]> <4eoq1i$[e-mail]>
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[e-mail] (Rand Gray) wrote:
>Jay Wicklund made some comments about our article in QEX, as though
>there was no way of reproducing the design without purchasing one
>of our kits.
>
>We included in the article 100% of the board schematics -- what we
>omitted was the 179 page software listing, which was obviously
>inappropriate anyway.

Since a significant amount of the functionality of the project is
contained in that 179 page listing, why is it appropriate to
publish the schematics but not the firmware?

Is this firmware available in source form via SASE+diskette, or
via download?

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *



From [e-mail] Mon Feb 05 21:42:53 1996
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From: Mark Mansfield <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Looking for mechanical filters.
Date: Thu, 01 Feb 1996 21:06:55 -0600
Organization: Univ. of Tenn at Martin
Lines: 9
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Xref: news.epix.net rec.radio.amateur.homebrew:13100 rec.radio.swap:56652

Thanks for everyone's response. I'm learning and hearing that maybe the
second filter is not the greatest idea but does offer some improvement?
Let me ask the group, given the choice between a second IF filter and
a DSP, all things considered, for only CW (weak signal work), which
would you rather have or recommend? By asking the question, I've certainly
gained some knowledge about the second filter, both pro and con. My
primary goal is reception at LF with the emission CW (in a otherwise
very noisy enviroment at best).
Mark


From [e-mail] Mon Feb 05 21:42:54 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!uunet!in2.uu.net!news.ios.com!usenet
From: [e-mail]@fwi.com
Newsgroups: rec.radio.amateur.homebrew
Subject: free programs
Date: 1 Feb 1996 22:24:31 GMT
Organization: Internet Online Services
Lines: 10
Message-ID: <4ereiv$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 204.235.86.126
X-Newsreader: IBM NewsReader/2 v1.2

Hi,
 I've put a few free programs out that might be of interest to experimenters.
At
this time they are on ftp.qrz.com.  ant2.exe, coax2.exe, resist2.e and coil2.e
xe.
They are all 32 bit OS/2 applications. They are simple graphic programs.
and will run with Warp.

 Teerev.zip which is a graphic EIRP calculator that'll run with Windows is on
the ARRL BBS.




From [e-mail] Mon Feb 05 21:42:55 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!tomrice
From: [e-mail] (Tom R. Rice)
Subject: Thordarson Xfmr Specs sought
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date: Fri, 2 Feb 1996 01:59:14 GMT
Lines: 25
Sender: [e-mail]

        I've run across two NOS Thordarson power xfmrs, but
        have no data on their specs.  The part number is

                        T-92R21

        If some kind soul has a post-WWII Thordarson catalog,
        I'd appreciate a copy (costs supported, of course),
        or at least the parameters of this particular xfmr.
        I could measure the volts parts, but have no real
        way to measure the power ratings (load it up 'til
        it gets hot?  Bummer!)

        Thanks and 73 de WB6BYH

-----------------------------------------------------------------
Tom Rice  WB6BYH               ||              [e-mail]
PO Box 2152                    ||
Livermore, CA  94551           ||
-----------------------------------------------------------------

--
"Start off every day with a smile and get it over with."  --W.C.Fields
Tom R. Rice
[e-mail]
CIS: 71160,1122


From [e-mail] Mon Feb 05 21:42:57 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Michael C. McHugh (TA2ZG/W2AV))
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need MC1648P I.C.
Date: 2 Feb 96 02:10:14 GMT
Organization: ucsd usenet gateway
Lines: 23
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

On 30 Jan 1996 [e-mail] (Doug Snowden) wrote:

>I need 2 or more of these. Anyone know where I can get small quantities
>of these - some place without a minimum order?
>These are 16 pin DIP VCO s.

Hi, Doug -

I just got an Oct-Dec 1995 Jameco catalogue that lists the MC1648P
for $3.95 in quantity 1-9.  Mail is a little slow getting here.

They are at 800-831-4242 voice or 800-237-6948 FAX.  I don't think they
have a minimum order, but they want $5 'processing' for orders under
$25.  That'd be no problem for me - looking through that catalogue
at all the parts I can't get here, I can run up a $25 order in about
thirty seconds flat ;-).  BTW, the Jameco catalogue shows it as a
14 pin DIP.

Hope this helps - 73

de Mike (TA2ZG/W2AV)     Remote Sysop TA2EM BBS - first PRBBS in Turkiye
Amateur Packet Radio:    TA2ZG@TA2EM.#IST.TUR.EU
Internet (email only):   Michael C. McHugh <[e-mail]>


From [e-mail] Mon Feb 05 21:42:58 1996
Path: news.epix.net!news.sprintlink.net!isc-newsserver.isc.rit.edu!jdc3538
From: [e-mail] (CRONIN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: 2 Feb 1996 03:26:56 GMT
Organization: Rochester Institute of Technology, Rochester, NY
Lines: 40
Message-ID: <4es0a0$[e-mail]>
References: <4emtge$[e-mail]>
NNTP-Posting-Host: grace.isc.rit.edu
Keywords: stereo transmitter


What you want is the BA-1404.  Everything you need is on one chip.  Get
the Ramsey FM-10 or DC Electronics Stereocaster kit for $30 or so..  By
the time you find the BA-1404, a 38 KHz crystal, etc., you may as well
have bought the kit.  I got a Stereocaster and replaced the output
transistor with a MRF581.  It was good for 1/4 watt or so when run off
12 volts..  Don't forget a low pass filter...

Oh, and they don't use PLL's, but the Stereocaster was stable enough
after running for 10 or 15 minutes.  The Ramsey is said to drift a little
more.

Check alt.pirate.radio (or alt.radio.pirate?)for a FAQ.  There's a FTP
site at ftp.dg.rtp.com or something like that, and a few web pages floating
around.

73..Jim  N2VNO

In article <4emtge$[e-mail]>,
Eliot Fenton <[e-mail]> wrote:
>Pardon my lack of stereo fundamentals...............
>
>But does anyone know of a chip manufactured by Motorola, National, etc.
>that will take left and right stereo audio outputs (from say a C.D.
>player) and produce an RF carrier suitable for reception and demod. on any
>stereo receiver?  If not a single chip, does anyone know of any articles
>written on how to build such a thing?  I would think the hardest part
>would be generating the subcarrier (a PLL?), but I would like to see what
>other people have come up with.
>
>Regards,
>
>--
>
>Eliot Fenton
>[e-mail]
>Compuserve: [e-mail]
>




From [e-mail] Mon Feb 05 21:42:59 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: trx designs (vac tube or transistor) help / beginner
Date: 2 Feb 1996 07:57:11 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 16
Message-ID: <4esg4n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de
Keywords: build tube transistor

>  I'm interested in possibly getting started in ham .. but I'd like to build
>my own set.  Unfortunately, the only resources I've found to this regard is
>anold 20W transmitter vac tube design.. and a corresponding reciever.

Wellcome.

However, when you want to build your own gear, it is vrey important
to carefully choose a design. there are of course lots of nice
designs around, eg in the ARRL Handbook. For simplicity and performance
designs with transistors and integrated circuits are best. Tubes are
only of interest once you get into the state when you are thinking about
a kilowatt output power on transmit.

73, Moritz DL5UH




From [e-mail] Mon Feb 05 21:43:00 1996
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From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec QEX "construction article??"
Date: Fri, 02 Feb 96 07:58:08 PDT
Organization: Northwest Nexus Inc.
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blv-pm1-ip21.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


Well, I seem to stand alone on this issue, so I'll drop it.  Just so
there is no misunderstanding, I enjoyed the article in question, and
think that the authors did a fine job of design.  I just didn't think
that it belonged in the "QEX ARRL Experimenters Exchange" (emphasis on
exchange) without more disclosure.  But I started the thread to see
how others felt; and it appears that there isn't a whole lot of
interest in the matter.  So, thanks for the comments....73



From [e-mail] Mon Feb 05 21:43:01 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Wanda M Desmond )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Printer generated transparency problem
Date: 2 Feb 1996 09:14:54 GMT
Organization: Netcom
Lines: 31
Message-ID: <4eskme$[e-mail]>
References: <4ep7jg$[e-mail]> <[e-mail]>
NNTP-Posting-Host: bak-ca1-14.ix.netcom.com
X-NETCOM-Date: Fri Feb 02  1:14:54 AM PST 1996

In <[e-mail]> Jay
Wicklund <[e-mail]> writes:
>
>
>In article <4ep7jg$[e-mail]>,
><[e-mail]> writes:
>
>> I am experiecing difficulty in getting a good solid blackening
>>in the solid trace areas of PCB layout transparencies on my Okidata
>>OL400 printer.It has been suggested to me that this might be a
>>electro static induced problem . Anybody have any good ideas?
>>
>>
>>       73 Ken W6GHV

>Hi Ken, well that is certainly an interesting problem.  I hope
>you get some help with it and post it to the group.  I've had
>the same problem with my HP Laserjet IIP using one of the films
>sold for that purpose.  I eventually gave up because the traces
>always ended up badly pitted from all the little pinholes.
>
>73 de KI7RH
>

I use a Canon Bj-10 to print transparencies. The "trick" is to print
two of them. Place one over the other, making very sure they match
exactly, and tape them together. This should help alleviate the
problem, unless you've got major size holes in the traces.

John
KE6TGN


From [e-mail] Mon Feb 05 21:43:02 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!inn
From: Don C Hamiel <hamiel>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: NEED HELP WITH HTX-202 AND ALINCO DJ-160 FINAL
Date: 2 Feb 1996 10:00:14 GMT
Organization: Hewlett-Packard, San Diego
Lines: 6
Message-ID: <4esnbe$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpsdlme5.sdd.hp.com
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To: [e-mail]
X-URL: news:[e-mail]
Xref: news.epix.net rec.radio.amateur.equipment:24537 rec.radio.amateur.homebrew:13114

Igor, the srfh transistor sounds like a Motorola part number. I know that they
manufacture a line with the prefix of "SRF". If I can find a data book I will
check it for you.

73 de Don N6NLX.



From [e-mail] Mon Feb 05 21:43:03 1996
Path: news.epix.net!news.sprintlink.net!hideout.emanon.net!alpha.sky.net!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!agate!cocoa.brown.edu!news
From: [e-mail] (john 015)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: Fri, 2 Feb 1996 10:08:58 EST
Organization: Brown University - Providence, Rhode Island  USA
Lines: 10
Message-ID: <4et9jr$[e-mail]>
References: <4emtge$[e-mail]> <[e-mail]>
NNTP-Posting-Host: brownvm.brown.edu
X-News-Software: BNN via BNN_POST v1.0 beta

In article <[e-mail]>, [e-mail] (Drew R. McGhee) said:
>Posted on 31 Jan 1996 at 16:11:57 by Drew R. McGhee
>There is a chip that does what you want. Sorry, can't think of the
>manufacturer. Ramsey sells two complete kits that uses it and does what you
>want. I've seen the chip sold separatly but can't find a listing in a catalog
>just for the chip at the present time.

Rohm's BA1404 is listed in the Dalbani catalog.

j


From [e-mail] Mon Feb 05 21:43:04 1996
Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!news.tcst.com!dildog.lgc.com!news.sesqui.net!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!newsmaster
From: Joerg Hedtmann <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: 2 Feb 1996 10:35:42 GMT
Organization: SubSea Offshore Ltd.
Lines: 6
Message-ID: <4espdu$[e-mail]>
References: <4emtge$[e-mail]> <[e-mail]>
NNTP-Posting-Host: dd05-015.compuserve.com
Mime-Version: 1.0
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To: [e-mail]

There are articles in the old Dutch Free Radio Magazine (Pirates off
course). All based on "normal" components. I can post a copy to you, if
you contact me.

Joerg (GM4YRI/DF3EI)



From [e-mail] Mon Feb 05 21:43:05 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!blanket.mitre.org!linus.mitre.org!usenet
From: Al Wong <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorola MICOR - Repeater MOD
Date: 2 Feb 1996 13:23:30 GMT
Organization: The MITRE Corp.
Lines: 11
Message-ID: <4et38i$[e-mail]>
NNTP-Posting-Host: m24837-pc.mitre.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.2N (Windows; I; 32bit)

Does any one have any info on modifying the Motorola MICOR to
be a repeater?  I saw this ad in a recent copy of CQ and was
wondering what the specs were and what it entails.

--
Al Wong                 The above opinion is mine, and does
KF4GDD                  not reflect that of my employer.  As
[e-mail]        with all my opinions, I write them, you
                        interpret them.




From [e-mail] Mon Feb 05 21:43:06 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!gatech!newsjunkie.ans.net!Rezonet.net!mixnews2!qbc-clic!com18!daniel.lacasse
Newsgroups: rec.radio.amateur.homebrew
In-Reply-To: [e-mail]
Subject: If you have a 742
From: [e-mail]
Message-ID: <[e-mail]>
Date: Fri, 2 Feb 96 14:28:00 EST
Organization: Babillard COM18 BBS
Lines: 1

If you have a 742, let me know...                [e-mail]


From [e-mail] Mon Feb 05 21:43:07 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: 2 Feb 1996 14:41:31 GMT
Organization: American Radio Relay League
Lines: 13
Message-ID: <4et7qr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: zlau.arrl.org
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
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To: [e-mail]

Intead of buying costly temperature compensating
capacitors, consider the circuit on page 14.20 of
the 1996 ARRL Handbook, which uses a pair of
thermistors to control a varactor diode.

Even better might be a digital circuit that can
differentiate between warmup drift and temperature
variation, as well as accomodate non-linearities
easily.  But, I've not seen a published example to
copy.

Zack KH6CP/1



From [e-mail] Mon Feb 05 21:43:08 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!gatech!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MIL VCO
Date: 2 Feb 1996 16:43:52 GMT
Organization: Hewlett-Packard
Lines: 12
Message-ID: <4etf08$[e-mail]>
References: <4el6f3$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com
Xref: news.epix.net sci.electronics.components:1912 rec.radio.amateur.homebrew:13135

In article <4el6f3$[e-mail]>,  <[e-mail]> wrote:
>Hi,
>
>I've heard that a compagny name Avantek (I'm not shure) make high
>quality VCO.
>a nice                    [e-mail]

Avantek is now owned by the Hewlett-Packard Communications Components
Division 408-435-7400.

Rick Karlquist N6RK
HP Santa Clara Div.


From [e-mail] Mon Feb 05 21:43:09 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!gatech!sdd.hp.com!hplabs!unix.sri.com!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: 10 Ghz Door Opener Sources
Date: 2 Feb 1996 18:13:37 GMT
Organization: Stanford Amateur Radio Club
Lines: 20
Message-ID: <4etk8h$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <[e-mail]> Neil Gjere <[e-mail]> write
s:
>I'm looking for a source of the 10 Ghz Gunns used in Door Openers.
>I'm specifically looking for Solfans or Other cavities that include a
>Varactor as well as the Gunn diode in the housing.
>
>I have several cavities that have just the Gunns in them, and would like
>to experiment with other designs.
>
>73s,
>
>Neil N0PFZ

I don't think any of the modules you mention have varactor diodes in them.
Motion detectors, which are just simple doppler radar implementations,
don't need varactors and would just be more expensive.  What you probably
want is a full blown Gunnplexer.  Be prepared to pay the price!

Steve Muther (WF6R)




From [e-mail] Mon Feb 05 21:43:10 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!imci4!newsfeed.internetmci.com!news.connectnet.com!draagen
From: [e-mail] (David Negaard)
Newsgroups: rec.radio.amateur.homebrew
Subject: Interface information for LCD display
Date: 2 Feb 1996 18:39:45 GMT
Organization: CONNECTnet Internet Network Services (service provider)
Lines: 25
Message-ID: <4etlph$[e-mail]>
NNTP-Posting-Host: cn1.connectnet.com
X-Newsreader: TIN [version 1.2 PL2]

 Picked up an interesting item at the local "Industrial Liquidator's"
yesterday, and I'm wondering if there's anyone out there who can help
me learn to interface it.

It's a dot-matrix LCD display, 128x67 (I think, it's somewhere between
64 and 70).  It has a board attached to the back that has three SMT
ICs and one of those odd ribbon connectors like you find inside a PC
keyboard, and also inside a lot of lap-tops.  Two of the ICs are
HD61202s, and one is an HD61203.  The ribbon is twenty-conductor.

The board is silk-screened with the name "Solomon" and what looks to
me like a part number "LM7310SGLU."  The bin that the item was found
in indicated that the display could 'do' grapics.

I'm planning on (eventually) using this item to display information
either for my packet/satellite station (still in the conceptual
stage), or for my HF station (also still in the conceptual stage).

Any help anyone out there can offer would be most welcome.

--
San Diego District Youth Leader
David Negaard                                    phone: [phone]
625 Shenandoah Avenue                    mailto:[e-mail]
San Marcos, CA  92069          http://www3.graceland.edu/~jrmj/negaard


From [e-mail] Mon Feb 05 21:43:11 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!news.usafa.af.mil!usenet
From: Brian Mork <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP Interference
Date: 2 Feb 1996 19:02:47 GMT
Organization: United States Air Force Academy
Lines: 14
Message-ID: <4etn4n$[e-mail]>
References: <4el9nf$[e-mail]>
NNTP-Posting-Host: dfp83.usafa.af.mil
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

[e-mail] (George) wrote:
>I'm trying to use my AEAfax to receive FAX/RTTY.  But My computer
>generates too much interfercne.
>I'm thinking of running a ground wire from
>second floor wind and driving a rod in the ground. Will this help?  I
>know nothing about grounding.

What frequency is the noise?  That will affect the answer of
whether grounding externally with a ground rod will help.

/Brian Mork





From [e-mail] Mon Feb 05 21:43:12 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!thunder.mgl.ca!granite.sentex.net!torn!howland.reston.ans.net!gatech!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!news.usafa.af.mil!usenet
From: Brian Mork <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec QEX "construction article??"
Date: 2 Feb 1996 19:06:27 GMT
Organization: United States Air Force Academy
Lines: 12
Message-ID: <4etnbj$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dfp83.usafa.af.mil
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Jay Wicklund <[e-mail]> wrote:
>I subscribed to QEX for the exchange of ideas and
>more technical design information than appears in QST; but this
>article doesn't do it for me.

They're all going this way (gluing together commercially available
stuff).  Do you get CCInk?  I just wrote a letter to their
editor saying the same think.  I subscribe for ideas, etc, not
just extended product reviews.





From [e-mail] Mon Feb 05 21:43:13 1996
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!ub!netfs.dnd.ca!nouvelles-sp.e33.dreo.dnd.ca!usenet
From: [e-mail] (Norm Reed)
Newsgroups: rec.radio.amateur.homebrew
Subject: INFO ON FERROXCUBE CHOKES
Date: 2 Feb 1996 20:47:29 GMT
Organization: DREO
Lines: 16
Message-ID: <4ett91$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 131.136.36.25
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

Could you please tell me what value a VK200-4 Ferroxcube choke has?
Also where to procure them?

Thanks
--
Norm Reed
[e-mail]
DND/DREO/Aerospace Radar & Navigation
3701 Carling Avenue
Building T86
Ottawa, ON, Canada
K1A 0K2
613-998-2891
fax [phone]
VE3AJI and VE7ALW



From [e-mail] Mon Feb 05 21:43:14 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!gatech!swrinde!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!jusdnews.fir.fbc.com!fitt-85.fir.fbc.com!mfischbe
From: [e-mail] (Mike Fischbein)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Date: 2 Feb 1996 23:13:56 GMT
Organization: CS First Boston Corporation
Lines: 36
Distribution: world
Message-ID: <4eu5rk$[e-mail]>
References: <4e6tbm$[e-mail]> <4e9a5d$[e-mail]> <[e-mail]> <4eiks1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: fitt-85.fir.fbc.com
X-Newsreader: TIN [version 1.2 PL2]

Robert Smits ([e-mail]) wrote:
: James Garland <[e-mail]> writes:

: >The suggestion to soak dirty rigs in warm water
: >with bubble bath raises a question I've wondered about
: >for years.

: >I've never had the nerve to try this technique.  I
: >just can't bring myself to dunk, say, my Central
: >Electronics 100V in the bathtub and let it soak.

: Never tried it with a scope. I have tried it with an
: 8 track tape player

: I'd only do this if there was no other way to clean
: it, and removing the transformers is certainly
: advisable on AC equipment.

I used to be responsible for computer access for about
80 users; there were several heavy smokers whose
terminal keyboards regularly gave up after three or
four months.  On a "why not" basis, I tried washing a
couple of them in the dishwasher (without the dry
cycle, of course) and letting them air dry
completely.

Worked fine.  I rinsed out all the smokers keyboards
every two months after that, and had no further problems.

        mike

--
Mike Fischbein   [e-mail]   CS First Boston

Any opinions expressed are mine only, and not necessarily
those of any other entity.  They may not even be mine.


From [e-mail] Mon Feb 05 21:43:15 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Path: news.epix.net!news.sprintlink.net!news.cirrus.com!bug.rahul.net!a2i!in-news.erinet.com!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Looking for mechanical filters.
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.homebrew,rec.radio.swap
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]>
Date: Sat, 3 Feb 1996 01:31:26 GMT
Lines: 15
Sender: [e-mail]
Xref: news.epix.net rec.radio.amateur.homebrew:13165 rec.radio.swap:56895

Mark Mansfield ([e-mail]) wrote:
: I'm looking for a pair of Collins (or equiv.) mechanical filters for a
: CW receiver which I'm building. I'm planning on using one of the filters
: in the front of the IF and using another in the "tail-ended" mode after

As I recall, Collins mechanical filters are 455 KHz.  Toyo makes
inexpensive 455 KHz ceramic resonators and filters in various
bandwidths, and DigiKey sells them.  Obviously these are no match for
the mechanical filters.  However they are cheap enough such that you
could cascade them or use them in various feedback configurations.  I
saw one design where the ceramic resonator was used instead of an
emitter bypass capacitor in an IF amp. The low cost and easy
availability of these filters invite experimentation.

Thomas KI4N


From [e-mail] Mon Feb 05 21:43:16 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!lamarck.sura.net!fconvx.ncifcrf.gov!mack
From: [e-mail] (Joe Mack)
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Message-ID: <[e-mail]>
Organization: Frederick Cancer Research and Development Center
References: <4e6tbm$[e-mail]> <4ee9o0$[e-mail]>
Date: Sat, 3 Feb 1996 04:16:20 GMT
Lines: 33

In article <4ee9o0$[e-mail]> [e-mail] (Roy Lewallen)
writes:
>>   [e-mail] (DAVE M . SCHERTZER) writes:
>>  Use WD-40 on my mobile rig to fix a LCD prob and
>>  it worked!!!! Tried contact/tuner spray and had to
>>  re-apply every 2 weeks, WD-40 no probs fer the
>>  last 6 months..works fine in a pinch.....
>>
>>  de ve7-lfa
>
>

>I use WD-40 all the time on swiches (rotary, AC power, relays,
>you name it), noisy potentiometers, sticky slugs in old UHF
>rig inductors, locks, and anything else that slides or turns.
>Doesn't hurt any of 'em. It's one of the Great Inventions of
>the 20th Century (along with latex paint and plastic drinking
>straws. .)
>
>Roy Lewallen, W7EL
>

I think last year was the 40th annivesary of WD-40. There
was a program on it on NPR (or something). It was the 40th
formulation tested to stop rocket parts (or jet aircraft
parts) from sticking together (or rusting, don't exactly
remember the whole story). WD-40 is the only product of
the WD-40 company. I don't think the guy who invented it
made much money out of it - it was formulated as an in-house
thing.

        Joe Mack NA3T




From [e-mail] Mon Feb 05 21:43:19 1996
Path: news.epix.net!news.sprintlink.net!news1.cris.com!news
From: [e-mail] (Mike Cook - AF9Y)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: See Weak Signals with your PC & Soundcard
Date: 3 Feb 1996 06:47:26 GMT
Organization: Concentric Internet Services
Lines: 42
Message-ID: <4ev0du$[e-mail]>
NNTP-Posting-Host: crc8-fddi.cris.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news.epix.net rec.radio.amateur.misc:97675 rec.radio.amateur.homebrew:13105

See Weak Signals with your PC & Soundcard

FFTDSP is a PC program which uses the soundcard
and audio from your radio to detect weak signals

The original FFTDSP38 program displays a
screen (spectrograph) which shows weak
signals as color traces against a dark background.
A continuous 4096 Point FFT (fast Fourier transform)
is used to provide 640, 2Hz wide filters.


FFTDSP41 - Beta Demo Version now available

Key Additional Features of the upgraded FFTDSP are:

- Record and Playback WAV files for post spectral analysis
- Automatic Color Gradient for optimum visibility
- Integration mode for signal detection below the noise
- Mouse point and click for selective recording
- On screen Moon position and TOD tracking
- True S/N (in 100 Hz Ref) bar graph
- Selective area and mode for S/N display
- Display Smoothing Filters
- Zoom In/Out for wider frequency coverage
- Improved Graphics Interface and Setup Screens
- Find Call feature from partial information



Available Download Sites for Beta Demo:

     Internet - http://www.webcom.com/af9y
     Internet - ftp.webcom.com/pub/af9y
     BBS - East Coast Atlantic BBS [phone]


EMail:
     [e-mail]   (preferred)
     [e-mail]




From [e-mail] Mon Feb 05 21:43:20 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!news.clubnet.net!news.interworld.net!news.net99.net!news1.exit109.com!ppp17-tr
From: [e-mail] (Harry J. Britton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Receiving SSB on AM SW radio.
Date: Sat, 03 Feb 96 16:32:32 GMT
Organization: Alantic Internet Technologies, Inc.
Lines: 6
Message-ID: <4f02nd$[e-mail]>
NNTP-Posting-Host: ppp17-tr.exit109.com
X-Newsreader: News Xpress Version 1.0 Beta #4

Hi:
        I use to only use two radios. One SW receiver, and an ordinary AM is
fine.  Find the SSB on the SW receiver, and tune around with the AM radio
(with the volume down) until you hear a hetrodyning from the AM radio. A
simple AM radio can transmit a strong signal sometimes! more than likely, you
will be able to find a spur in the band your listening.


From [e-mail] Mon Feb 05 21:43:21 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Arizona Microschip
Date: Sat, 3 Feb 1996 17:12:23 -0800
Organization: Call America Internet Services  [phone]
Lines: 6
Message-ID: <[e-mail]>
References: <4eu5rk$[e-mail]> <4f07e3$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4f07e3$[e-mail]>

Recently, I ran across a reference to Arizona Microchip devices which was
interesting.  Does anyone have an address or a clue as what they
manufacture?  I suspect it might be  a "STAMP" product but I am not
sure.  They have a development kit available too.
Cliff Buttschardt   W6HDO   Morro Bay, Calif



From [e-mail] Mon Feb 05 21:43:22 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!news2.net99.net!news.cais.net!xara.net!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!in1.uu.net!news.ios.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Thordarson Xfmr Specs sought
Date: 3 Feb 1996 20:51:35 GMT
Organization: Internet Online Services
Lines: 33
Message-ID: <4f0hsn$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dialup24.fwi.com
X-Newsreader: IBM NewsReader/2 v1.2

In <[e-mail]>, [e-mail] (Tom R. Rice) writes:
>       I've run across two NOS Thordarson power xfmrs, but
>       have no data on their specs.  The part number is
>
>                       T-92R21
>
>       If some kind soul has a post-WWII Thordarson catalog,
>       I'd appreciate a copy (costs supported, of course),
>       or at least the parameters of this particular xfmr.
>       I could measure the volts parts, but have no real
>       way to measure the power ratings (load it up 'til
>       it gets hot?  Bummer!)
>
>       Thanks and 73 de WB6BYH
>
>-----------------------------------------------------------------
>Tom Rice  WB6BYH               ||              [e-mail]
>PO Box 2152                    ||
>Livermore, CA  94551           ||
>-----------------------------------------------------------------
>
>--
>"Start off every day with a smile and get it over with."  --W.C.Fields
>Tom R. Rice
>[e-mail]
>CIS: 71160,1122

 Weight! Yep, weight will get you into the ballpark on those old iron core xfo
rmers
 at least approximate the KVA rating.

                        WD9AHF
p.s. powdered cores and new fangled space aged core designs won't comply. You
might try an old NEWARK Catalog.


From [e-mail] Mon Feb 05 21:43:24 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!inquo!vyzynz!news.dacom.co.kr!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!spool.mu.edu!howland.reston.ans.net!nntp.crl.com!newshub.cts.com!not-for-mail
From: [e-mail] (John Kolb)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Looking for mechanical filters.
Date: 3 Feb 1996 23:14:25 GMT
Organization: CTS Network Services (CTSNET), San Diego, CA
Lines: 38
Message-ID: <4f0q8h$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: sd-i2.cts.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.homebrew:13130 rec.radio.swap:56774

Thomas G. McWilliams ([e-mail]) wrote:
: Mark Mansfield ([e-mail]) wrote:
: : I'm looking for a pair of Collins (or equiv.) mechanical filters for a
: : CW receiver which I'm building. I'm planning on using one of the filters
: : in the front of the IF and using another in the "tail-ended" mode after

: As I recall, Collins mechanical filters are 455 KHz.

Collins mech filters are available in a number of center freqs.
My junkbox has CF's of 455, 450, 462, 500, 250 kHz, and maybe
others.

<Shameless Plug> e-mail for a list of filters for sale.

: Toyo makes
: inexpensive 455 KHz ceramic resonators and filters in various
: bandwidths, and DigiKey sells them.  Obviously these are no match for
: the mechanical filters.  However they are cheap enough such that you
: could cascade them or use them in various feedback configurations.  I
: saw one design where the ceramic resonator was used instead of an
: emitter bypass capacitor in an IF amp. The low cost and easy
: availability of these filters invite experimentation.

Note: ceramic resonators are a two terminal device, much like
a quartz crystal, except not as stable or as high a Q.

Replacing the emitter bypass cap of the IF stages DOES work well,
but is becoming less of an available option as receivers go to
mostly integrated circuits. You have some degree of control over
the results by selecting the resonators: two resonators with a
CF of 455 kHz will give a sharper IF than one of 456 and one
of 454 kHz.

This has been an interesting thread, but perhaps it should stay
in r.r.a.homebrew, and not rec.radio.swap if continued.

John Kolb  KK6IL  [e-mail]



From [e-mail] Mon Feb 05 21:43:25 1996
Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!usenet
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: controlled carrier AM?
Date: Sat, 03 Feb 1996 23:55:25 GMT
Organization: customer of Internet America
Lines: 26
Message-ID: <4f0sm1$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dal21-27.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

Michael Haydon <[e-mail]> wrote:

>Read an article in april 1962 qst regarding controlled carrier amplitude
>modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w
>mobile rig. am hoping to put together 300watt or so unit using a pair of
>microwave oven transformers, but am wondwering abt their audio freq.
>response.
>any replies commenting on how much you hate am will be ignored.

Not sure about the audio response, but know about controlled carrier
a.m. a little.  I hv an old set of Drake Twins which use controlled
carrier.  The guys on the other end don't seem to even notice the
difference unless I say something about it.  The benefit isn't so much
that you get more power, but that you have less dissipation to get the
same power.  The Drake uses sweep tubes, it wouldn't do but a few
watts if it used regular full carrier a.m.  Sounds like a neat
project, good luck!

Ok, so I didn't provide any help, just defending a.m. in advance of
the attacks!  I also run a Yaesu FT-990, but the a.m. sounds better on
the Drakes, even though it has less power!
73,
Kerry
WD5ABC




From [e-mail] Mon Feb 05 21:43:26 1996
Path: news.epix.net!news.sprintlink.net!news.comm.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!news.iadfw.net!usenet
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: QRP Schematics scanned and ready!
Date: Sat, 03 Feb 1996 23:58:35 GMT
Organization: customer of Internet America
Lines: 15
Message-ID: <4f0sru$[e-mail]>
NNTP-Posting-Host: dal21-27.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

Hi guys,  I finally got the schematics scanned today.  They need a
little cleaning up, but they're about ready.  I'm open for
suggestions, should I post them here, somewhere else, or just e-mail
them to whoever wants them.  Does anybody mind if I post them here?
Is there a proper place to post a schematic?  They are bmp's now,
would .jpg's be better?

All these dumb questions from a newbie poster!  I don't even know for
sure I can post them, but I'll try it somewhere first.
Thanks,
Kerry Miller
[e-mail]
WD5ABC




From [e-mail] Mon Feb 05 21:43:27 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: Sun, 04 Feb 96 02:09:52 GMT
Lines: 52
Message-ID: <[e-mail]>
References: <4enu4k$[e-mail]> <4eqdr2$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

First, I want to thank everyone for the excellent ideas and information
on this subject.

The first two PTO's are back in the rig now and I have had a chance to
use them on the air for a few days.  They seem to have settled down a
little, or at least they're not showing the same drift characteristics
as when they were on the test bench.  I'm not sure why that is, because
I was testing them in the rig after each change.

At any rate, the initial, slow warmup drift now seems to be downward
rather than upward, indicating that some additional compensation might
be needed.  It's not too bad though, and I may leave it as-is.  The
drift that occurs when I begin transmitting (which is aggravated when
I use my amplifier because it's next to the rig), is still in an
upward direction.

This may be the result of a temperature gradient across the PTO
components (I think it was Cliff who mentioned that possibility).
Short of potting the PTO or installing a heater, there may not be much
I can do about this.  I want to mention that the problem isn't all
that bad, and maybe I'm just being picky.  I was reading an older
receiver construction article recently titled "An Engineer's Ham-Band
Receiver", which describes a very well-constructed piece of equipment.
The author's VFO was built on a custom (heavy) subassembly using a few
of the parts from a BC-221 frequency meter.  When he talks about how
good the stability is, he describes it as being within 5 ppm per
degree (Centigrade, I think).  Now, if my math is correct, that means
that at a PTO frequency of approximately 5 MHz, a temperature change
from 70F to 80F could cause a frequency change of as much as 150 Hz.
Actually, the PTO's I've already worked on are not be too far from that
kind of stability at this point, at least for initial drift.

I guess what's bothering me most about this is that my old Yaesu
FT-101EE was like a rock, despite the fact it was a hybrid.  After a
fifteen minute warmup, I could ragchew for hours on CW without touching
the dial once.  Maybe this was just luck of the draw; some owners I've
talked to have apparently had major problems with drift in their 101's.

Anyway, the responses to my original question are enough to keep me
busy reading, checking components and experimenting for several weeks
or even months.  As a possible alternative before I start this project
in earnest, can anyone tell me whether it's feasible to consider
replacing the PTO's with 5-5.5 MHz synthesizers?  I've missed most of
the QST/CQ/Ham Radio articles in the last five years so I'm not familiar
with advances regarding available components.  Is it possible to build
a synthesizer for this application with 10 Hz resolution at a reasonable
cost, say with two or three chips?  Or is this the type of design that
still requires a fairly complex circuit?

Tnx & 73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:43:29 1996
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in2.uu.net!news.goodnet.com!goodguy!ecloud
From: ecloud@goodguy (Shawn Ruttledge)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 4 Feb 1996 05:05:29 GMT
Organization: GoodNet
Lines: 18
Message-ID: <4f1eqp$[e-mail]>
References: <4d5d0k$[e-mail]> <4d7lvt$[e-mail]> <[e-mail]> <4e9pvl$[e-mail]>
NNTP-Posting-Host: goodnet.com
X-Newsreader: TIN [version 1.2 PL2]

While we're on the subject, can anybody identify this MOV (at least I think
it's an MOV):

<triangle symbol>ZNR
14K201U
<backwards R>U 46

It's black, shiny, looks like a disc cap but is a bit too thick to be one of
those, and I can see through the coating that the leads bend and go to the
center of the material.  I'd like to find out what the joule rating is for the
se
- maybe they'd be useful.  I got a bunch of them in a Circuit Specialists
mystery box.  My meter says the capacitance is 878 pF.

--
  _______                      KB7PWD @ KC7Y.AZ.US.NOAM   [e-mail]
 (_  | |_)                              html: http://www.goodnet.com/~ecloud
 __) | | \__________________________________________________________________
* OO * Khoros * Linux * robotics * techno * Gravis Ultrasound * X window *


From [e-mail] Mon Feb 05 21:43:30 1996
Path: news.epix.net!news.sprintlink.net!news.missouri.edu!hptemp1.cc.umr.edu!gamma.rollanet.org!access-1-1.rollanet.org!joeh
From: joe haas <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Yaesu FT-530 remote control info
Date: 4 Feb 1996 06:02:03 GMT
Organization: FF Systems
Lines: 16
Distribution: world
Message-ID: <4f1i4r$[e-mail]>
NNTP-Posting-Host: access-1-1.rollanet.org
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Newsreader: Nuntius 2.0.4_68K
X-XXMessage-ID: <[e-mail]>
X-XXDate: Sun, 4 Feb 1996 06:07:11 GMT

I am looking for info concerning the fromat of the remote control
data stream used by the Yaesu MH-29(a2b) speaker mic and the FT-530 dual
band
HT.  I do not have the aforementioned speaker mic, so I can't "reverse
engineer"
the spec.  I want to build a remote control interface for my computer and
need the formats to change frequency, band, etc...

***************************************
* From the desktop of Joe Haas, KE0FF *
*******************************************************************
* FF Systems                           [phone] (voice)     *
* P.O. Box 2363                        [phone] (fax)       *
* Rolla, MO  65402              http://www.rollanet.org/~joeh     *
*   ...Where repeater controllers (and other stuff) are cool...   *
*******************************************************************


From [e-mail] Mon Feb 05 21:43:31 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 BAND SWITCH REPLACEMENT
Date: 4 Feb 1996 14:34:42 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 20
Sender: [e-mail]
Message-ID: <4f31oi$[e-mail]>
References: <4f28pv$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4f28pv$[e-mail]>, "Thomas L. Gaines, Sr."
<[e-mail]> writes:

>
>I am looking for a replacement switch deck(wafer) for the SB-220
>amplifier.  If anyone has a substitution, plase give me the source.\\
>
>Tom Gaines/N5ISE
>
>

Buy an Ameritron AL-80B bandswitch and use the wafers in the Heathkit. The
single rear wafer is the only one necessary to use, unless you want 160
through 10.

The voltage rating is higher, so the switch won't be damaged as easily if
you mis-tune or underload the amp.. Improper loading is by far the biggest
cause of switch failure.

73 Tom


From [e-mail] Mon Feb 05 21:43:32 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.emf.net!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: controlled carrier AM?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sun, 4 Feb 1996 15:34:05 GMT
Lines: 21

In article <[e-mail]> Michael
Haydon <[e-mail]> writes:
>Read an article in april 1962 qst regarding controlled carrier amplitude
>modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w
>mobile rig. am hoping to put together 300watt or so unit using a pair of
>microwave oven transformers, but am wondwering abt their audio freq.
>response.
>any replies commenting on how much you hate am will be ignored.


Controlled carrier AM is a lot harder to get to work *right* than
it may appear. It's usually better to just beef up the PA to run
regular plate modulation, or build a high level DSB rig. The latter
is even more conserving of input power, and not really harder to
do than doing controlled carrier correctly.

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


From [e-mail] Mon Feb 05 21:43:33 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!uw-beaver!nntp.cs.ubc.ca!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!chi-news.cic.net!nntp.coast.net!howland.reston.ans.net!news-e1a.megaweb.com!pop.gnn.com!DBerg95252
From: [e-mail] (DENNIS BERG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Feb '96 QST Rotator pal
Date: Sun, 04 Feb 1996 15:59:33
Organization: GNN
Lines: 7
Message-ID: <4f36uc$[e-mail]>
NNTP-Posting-Host: www-36-171.gnn.com
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
X-GNN-NewsServer-Posting-Date: 4 Feb 1996 21:03:08 GMT
X-Mailer: GNNmessenger 1.2

Has anyone completed building the rotator pal and
found it to work without modifications.  My first
attempt at it has been a dud.  Seems most of the
projects listed in most magizines require a patch
to work. Problem is the patch doesn't show up
untill several months have gone by.



From [e-mail] Mon Feb 05 21:43:34 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!news.alt.net!news1.alt.net!news.exodus.net!uunet!in1.uu.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: controlled carrier AM?
Date: Sun, 04 Feb 1996 18:09:48 GMT
Organization: RST Engineering
Lines: 26
Message-ID: <4f2srh$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

Michael Haydon <[e-mail]> wrote:

>Read an article in april 1962 qst regarding controlled carrier amplitude
>modulation, YES A.M.!!!. anyone tried this technique?

Make my living at it.  Are you referring to controlled carrier as in
controlling the RF drive to the final stage or controlled carrier as
in supply half the Vcc to the finals through a modulator that then
swings from ground to Vcc?

> Article was on 40w
>mobile rig. am hoping to put together 300watt or so unit using a pair of
>microwave oven transformers

On what frequencies, and what does a uwave oven transformer have to do
with it?

Jim


Jim Weir VP Engineering  | You bet your sweet patootie I speak
RST Engineering          | for the company.  I OWN the cotton-
Grass Valley CA 95945    | pickin' company.
voice/fax [phone]   | AR Adv. WB6BHI               Cessna 182A N73CQ
[e-mail]         | Comm'l Pilot & CFI Airplane/Glider  A&P Mechanic



From [e-mail] Mon Feb 05 21:43:35 1996
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news4.noc.netcom.net!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!usenet
From: [e-mail] (James P. Meyer)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: See Weak Signals with your PC & Soundcard
Date: Sun, 04 Feb 1996 19:31:28 GMT
Organization: Duke University, Durham, NC, USA
Lines: 16
Message-ID: <[e-mail]>
References: <4ev0du$[e-mail]>
NNTP-Posting-Host: async46.async.duke.edu
X-Newsreader: Forte Agent .99c/16.141
Xref: news.epix.net rec.radio.amateur.misc:97740 rec.radio.amateur.homebrew:13133

[e-mail] (Mike Cook - AF9Y) wrote:


>Available Download Sites for Beta Demo:
>
>     Internet - http://www.webcom.com/af9y
>     Internet - ftp.webcom.com/pub/af9y
>     BBS - East Coast Atlantic BBS [phone]
>

        Adding a tilde (~) before the "af9y", like this "~af9y", might be
necessary for some ftp or web browser programs.

        Jim




From [e-mail] Mon Feb 05 21:43:36 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!usenet
From: [e-mail] (James P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: Sun, 04 Feb 1996 19:40:07 GMT
Organization: Duke University, Durham, NC, USA
Lines: 16
Message-ID: <[e-mail]>
References: <4d5d0k$[e-mail]> <4d7lvt$[e-mail]> <[e-mail]> <4e9pvl$[e-mail]> <4f1eqp$[e-mail]>
NNTP-Posting-Host: async46.async.duke.edu
X-Newsreader: Forte Agent .99c/16.141

ecloud@goodguy (Shawn Ruttledge) wrote:

>While we're on the subject, can anybody identify this MOV (at least I think
>it's an MOV):
>
><triangle symbol>ZNR
>14K201U
><backwards R>U 46

     Check your DigiKey catalog.  They're nominal 130 VAC "ZNR"s.  4500
Amp surge rating.  They'd make ideal surge suppressors for 120 Volt AC
applications like turning a regular outlet strip into a "protected" strip.

        Jim




From [e-mail] Mon Feb 05 21:43:37 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jim Storm)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 BAND SWITCH REPLACEMENT
Date: Sun, 04 Feb 1996 21:05:42 GMT
Organization: ix.netcom.com
Lines: 12
Message-ID: <4f3737$[e-mail]>
References: <4f28pv$[e-mail]>
NNTP-Posting-Host: smx-ca3-10.ix.netcom.com
X-NETCOM-Date: Sun Feb 04  1:05:43 PM PST 1996
X-Newsreader: Forte Free Agent 1.0.82

"Thomas L. Gaines, Sr." <[e-mail]> wrote:

>I am looking for a replacement switch deck(wafer) for the SB-220
>amplifier.  If anyone has a substitution, plase give me the source.\\

>Tom Gaines/N5ISE

According to QST,  parts are still available from the Heath Order Desk
at 616-925-5899/4914.

                                     73, Jim WB6LWS



From [e-mail] Mon Feb 05 21:43:38 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!dimensional.com!news.wizard.com!imci5!imci4!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet
From: [e-mail] (Glenn E. Little)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 4 Feb 1996 21:12:09 GMT
Organization: Amateur Radio
Lines: 30
Message-ID: <4f37f9$[e-mail]>
References: <4d5d0k$[e-mail]> <4d7lvt$[e-mail]> <[e-mail]> <4e9pvl$[e-mail] <4f1eqp$[e-mail]>
NNTP-Posting-Host: chs0053.awod.com
X-Newsreader: WinVN 0.92.6+

In article <4f1eqp$[e-mail]>, ecloud@goodguy (Shawn Ruttledge) sa
ys:
>
>While we're on the subject, can anybody identify this MOV (at least I think
>it's an MOV):
>
><triangle symbol>ZNR
>14K201U
><backwards R>U 46
>
>It's black, shiny, looks like a disc cap but is a bit too thick to be one of
>those, and I can see through the coating that the leads bend and go to the
>center of the material.  I'd like to find out what the joule rating is for th
ese
>- maybe they'd be useful.  I got a bunch of them in a Circuit Specialists
>mystery box.  My meter says the capacitance is 878 pF.
>
The ZNR implies that they are made by Panasonic.
Digi-Key sells Panasonic MOVs.
Their catalog should shead some light on the ratings.


201 gives voltage at 200 volts +- 10%
14 is the series surge current is 4500 Amps.
Max allowable voltage ia 130 VAC, 270 VDC

Hope this helps

73
Glenn
WB4UIV



From [e-mail] Mon Feb 05 21:43:39 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in2.uu.net!gunner.wpe.com!news
From: Eddie Caffray <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: English IC Chip Needed
Date: Sun, 04 Feb 1996 22:58:28 -0500
Organization: Oneonta Amateur Radio Club
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp10.wpe.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0GoldB1 (Win95; I)

I have some Baxall video cameras from Great Britan, model CD6210/24AB.
I need a IC part number NXA1031/103. Wnat to use them for ATV work.

Eddie N2XDS


From [e-mail] Mon Feb 05 21:43:40 1996
Path: news.epix.net!news.sprintlink.net!paperboy.ids.net!anomaly.ideamation.com!anomaly.ideamation.com!not-for-mail
From: [e-mail] (Michael P. Deignan)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: 82 Repeater in Kansas City
Date: 4 Feb 1996 23:21:25 -0500
Organization: The Ace Tomato Company
Lines: 20
Message-ID: <4f40k5$[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: anomaly.ideamation.com
Xref: news.epix.net rec.radio.amateur.policy:33006 rec.radio.amateur.antenna:18905 rec.radio.amateur.equipment:24587 rec.radio.amateur.homebrew:13144 rec.radio.amateur.digital.misc:13971

In <[e-mail]>
        [e-mail] (Donald I. Baker) writes:

>Technical solutions do exist.  Using a "TX-ID" board, which uniquely
>fingerprints each transmitter and a PC one can "slectively" include or
>preclude individual users.
>
>The board was not meant for that purpose, but with just a little Basic of C
>codes, it workd just fine.  It is especially easy if you have a single or
>limited number of receive site.

I too can attest to the helpfulness of the TX-ID system. Coupled with our
Doppler Systems DF gear, the TX-ID has allowed us to bag several Drew-like
scumbags here in the RI area who have no appreciation for Part 97.

MD
--
--
-- "Who needs looks when you've got taste?"
--


From [e-mail] Mon Feb 05 21:43:41 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: wrinkle paint
Date: Mon, 05 Feb 96 01:11:24 GMT
Lines: 39
Message-ID: <[e-mail]>
References: <4egsuk$[e-mail]> <[e-mail]> <4eovge$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

This is slightly off the subject, but I wanted to mention something
that might help someone who's painting a cabinet but doesn't want
wrinkle paint.

I recently built a custom desk for my ham shack and I needed to match
a light gray formica finish on some other office furniture in the same
room (as per instructions from XYL).  The paint I used was Dutch Boy
Floor and Porch polyurethane enamel, custom mixed to match the color.

I brushed on two coats but the paint was very thick and it refused
to completely level (even though it took six or seven hours for the
surface to dry).  What I ended up with was a lot of brush marks and
streaks on an otherwise nice-looking desk.

Another application method was needed, but due to winter weather, it
was impossible to load up my spray gun and take the piece outside.
Finally, I went back to the hardware store and purchased several mini-
size 3" paint rollers intended for trim work.  I used these to apply a
third coat to the piece, and that coat not only hid the previous
faux pas, it left a great-looking textured finish.

I have since tried this paint on a small aluminum panel, using the
same application technique but sanding the panel with 100-grit first.
The result was a terrific semi-gloss finish with a *light* texture that
looks like an expensive powder-coat paint job.  After a week or so, the
surface becomes so hard it's almost impossible to scratch unless you're
really trying to damage it.

Anyone wanting to paint or repaint a piece of equipment owes this
method a try.  The materials are cheap and the resulting finish is
tougher than many spray enamels (and much tougher than lacquer).
Clean-up is simple too - throw away the roller and put the lid back on
the can.  This is one of the few ways I know to produce a genuine
high-quality finish at home without commercial-grade equipment. With
just a little care, it should last the life of the equipment.

73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:43:43 1996
Path: news.epix.net!news.sprintlink.net!cc.iu.net!news
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: 5 Feb 1996 02:36:13 GMT
Organization: Organized?  I can't even find my car keys
Lines: 44
Message-ID: <4f3qet$[e-mail]>
References: <4enu4k$[e-mail]> <4eqdr2$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: netport-80.iu.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

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

>Anyway, the responses to my original question are enough to keep me
>busy reading, checking components and experimenting for several weeks
>or even months.  As a possible alternative before I start this project
>in earnest, can anyone tell me whether it's feasible to consider
>replacing the PTO's with 5-5.5 MHz synthesizers?  I've missed most of
>the QST/CQ/Ham Radio articles in the last five years so I'm not familiar
>with advances regarding available components.  Is it possible to build
>a synthesizer for this application with 10 Hz resolution at a reasonable
>cost, say with two or three chips?  Or is this the type of design that
>still requires a fairly complex circuit?
>
>Tnx & 73,
>Jack  WB3U

As a synthesizer designer, I'd say to be careful.  I really think it's
so much easier to design a bad synthesizer than a bad PTO, that I wouldn't
recommend going that route.  Unless you want to read up on and learn
about PLL design as a new hobby, in which case go for it.

That said, I think I'd look long and hard at a DDS for this job.  Use
a TCXO for the source, and get one of those CMOS DDSes that will handle at
least a 20 MHz clock.  Wrap a good tight BP filter around it, and it
seems like a good approach.

Any reasonable approach using regular PLLs would entail at least a couple
of loops, and be fairly complex, IMO.



73,
Bob


--
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] Mon Feb 05 21:43:44 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!usc!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!aztec.asu.edu!ballnt
From: [e-mail] (John Ballentine)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Arizona Microschip
Date: 5 Feb 1996 03:52:33 GMT
Organization: Arizona State University, Tempe, AZ (USA)
Lines: 17
Message-ID: <4f3uu1$[e-mail]>
References: <[e-mail]> <4eu5rk$[e-mail]> <4f07e3$me5@newsbf02.
Reply-To: [e-mail] (John Ballentine)
NNTP-Posting-Host: aztec.asu.edu


In a previous article, [e-mail] (Clifford Buttschardt) sa
ys:

>Recently, I ran across a reference to Arizona Microchip devices which was
>interesting.  Does anyone have an address or a clue as what they
>manufacture?  I suspect it might be  a "STAMP" product but I am not
>sure.  They have a development kit available too.
>Cliff Buttschardt   W6HDO   Morro Bay, Calif
>
This probably refers to Microchip Technology. They make microcontroller
chips and do have several development kits available. I don't have the
address or phone number, but the main offices are here in Chandler, AZ on
Chandler Blvd.

--
John Ballentine WB2SNB          Divina natura dedit agros,
Chandler, Arizona               ars humana aedificavit urbes.


From [e-mail] Mon Feb 05 21:43:46 1996
Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!usenet
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: First QRP schematic (description)
Date: Mon, 05 Feb 1996 04:32:31 GMT
Organization: customer of Internet America
Lines: 21
Message-ID: <4f419j$[e-mail]>
NNTP-Posting-Host: dal10-16.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

Ok, here goes nothing.  I'm trying a small one first.  This is a
single-chip vfo/exciter from 73 magazine.  It has several files, all
zipped together into 1.  The parts list may not be legible, so I
retyped it along with some instructions for the tuning capacitor.  If
this one works, I'll start sending the others as soon as I get them
cleaned up a little better.

I've heard from several guys, if email attatchments work better, I'll
do that too, I'm easy!  I'll give this a try, be patient, I've never
posted a file before.  Funny, you get DXCC, but you still don't know
how to use a stupid news reader!  Here goes nothing, hope it works!

Let me know what you think.  The other ones are a 40 and an 80 meter
transmitter, and a few odd tx/rx/tranceiver schematics.  I'll attatch
the schematic to a different file so those who aren't interested won't
have to wait on a download!
73,
Kerry
[e-mail]




From [e-mail] Mon Feb 05 21:43:46 1996
Path: news.epix.net!news.sprintlink.net!shore4.intercom.net!usenet
From: "Steven A. Bailey" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Toner Transfer System?
Date: 5 Feb 1996 13:08:33 GMT
Organization: Skipjack.net
Lines: 9
Message-ID: <4f4vgh$[e-mail]>
NNTP-Posting-Host: modem186.intercom.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)

Has anyone ever tryed this 'Toner Transfer System'
by DynaArt Designs for PCB creation?

Thanks,

Steve

WF3O



From [e-mail] Fri Feb 09 16:59:46 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news.utdallas.edu!news.swmed.edu!news
From: Antonio Howell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 7 Feb 1996 21:19:26 GMT
Organization: UT Southwestern Medical Center
Lines: 5
Message-ID: <4fb50u$[e-mail]>
NNTP-Posting-Host: 129.112.43.147
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; PPC)
X-URL: news:rec.radio.amateur.homebrew

Looking to buy a scanner that has been fixed to get all the
cellular channels. Please write me if you know where I can
find one




From [e-mail] Fri Feb 09 16:59:47 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!ccsun2.sogang.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 6 Feb 96 19:28:42 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hi !
I'm interested in make-it-yourself metal detectors. I need a description and
schematics  for such devices. Somehow I tend to trust the British magazine
Practical Electronics , but I have access to issues up to 1990. In July and
October 1988 issues there are such articles, but they are missing. The central
Science and Technology Library In my country has no extra magazines. Any PE
readers or someone who can access searchable databases holding past issues of
PE, please help.

PS-I hope this group accepts non-ham-related questions as well

Thank you
 Christo
Bulgaria


From [e-mail] Fri Feb 09 16:59:48 1996
Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!globe.indirect.com!s92.phxslip4.indirect.com!tracker
From: [e-mail] (Mark Saunders)
Newsgroups: rec.radio.amateur.homebrew
Subject: 1996 ARRL November Sweepstakes Location Needed
Date: Thu, 1 Feb 1996 20:52:23 UNDEFINED
Organization: Amateur Radio Station KJ7BS
Lines: 38
Message-ID: <[e-mail]>
NNTP-Posting-Host: s92.phxslip4.indirect.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1]

Dan Rockhold, AB7AS and Mark Sunders, KJ7BS are looking for a location in
North Dakota from which to operate AB7AS during the 1996 ARRL November
Sweepstakes.

If you are not a contester or know someone who is not a contester, and would
be agreeable to having 2 guest operators for the contest, please respond!

We are in the planning stages for this expedition, but we need to get a
location very soon.

We are interested in the station equipment, especially the antennas.  We can
bring out own radios, power supplies, computers and interfaces, if necessary.

However, we can not bring the antenna farm, too.

The station owner is more than welcome to join us in out endevor, or just
watch, keep up awake, or what ever.  WE WANT YOU TO BE PART OF OUR TEAM.  Our
goal is NOT to win the contest, but to have a good time and gain new operating

skills.  From Dan's home QTH in Phoenix, AZ, we got all but 7 sections in the
1995 November Sweepstakes.  We do have a lot of fun with this hobby.

If you are interested, or know someone who is interested, please contact me or

Dan at one of the addresses below.

Mark Saunders, KJ7BS
[e-mail]
[e-mail]

Dan Rockhold, AB7AS
[e-mail]


73 DE


Mark Saunders - KJ7BS
Glendale, AZ
PACKET:   [e-mail]
INTERNET: [e-mail]


From [e-mail] Fri Feb 09 16:59:51 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!chassis.demon.co.uk
From: David Chapman <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,sci.electronics.components
Subject: Re: 7910 MODEM CHIPS WANTED
Date: Tue, 06 Feb 96 21:28:38 GMT
Organization: Chapman Associates
Lines: 25
Message-ID: <[e-mail]>
References: <4f7mjg$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: chassis.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: chassis.demon.co.uk
Xref: news.epix.net rec.radio.amateur.digital.misc:14017 rec.radio.amateur.homebrew:13192 sci.electronics.components:1998

  Hi David...

> does anyone have any 7910 or 7911 modem chips for sale. Either the AMD or
> SGS Thompson variety?

  I have one brand new AM 7911 DC chip which I would willingly donate to
help a good cause.  If you consider that you are one <G>, then send me a
stamped addressed envelope (see my web site) and I will send it back by
return post.

  BTW, I also have a built-up modem from a Wireless World design which
uses, I think, a 7910 chip.  It is built on their approved PCB and cased
with a 240v PSU.  It worked when I last used it some years ago. If that is
of any interest I am open to offers.

  ATB  -  Dave

--
David C.Chapman - Chartered Engineer. FIEE.   ([e-mail])
--------------------------------------------------------------------------
CHAPMAN ASSOCIATES is a Consultancy offering practical expertise and
design skills in the fields of counter-surveillance, electronic protection
and security.  Visit our Web site at  http://www.ant.co.uk/~chassis/
--------------------------------------------------------------------------


From [e-mail] Fri Feb 09 16:59:52 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail
From: [e-mail] (Dave Mann)
Subject: 813 Xmtr for 160M
Message-ID: <287cc$[e-mail]>
Date: Thu, 08 Feb 1996 11:50:42 GMT
Reply-To: [e-mail]
X-Newsreader: Forte Free Agent 1.0.82
Lines: 12

I would very much appreciate any advice or opinions about constructing
a crystal controlled cw-only transmitter for 160 meters.  I have 2
brand new 813's and sockets, lots of other "junk box" parts.  My idea
is to have a very simple but high power cw transmitter to use for cw
QSO's around 1.835mhz.   If there is another "window" for 160M that I
should use (like for JA's), perhaps I could come up with a 2 crystal
design.

Thanks in advance es 73's
Dave, VP2EHF





From [e-mail] Fri Feb 09 16:59:53 1996
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 813 Xmtr for 160M
Date: Thu, 08 Feb 96 09:07:54 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 30
Distribution: world
Message-ID: <4fdpkf$[e-mail]>
References: <287cc$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Dave Mann) wrote:

>I would very much appreciate any advice or opinions about
>constructing a crystal controlled cw-only transmitter for 160 meters.
>I have 2 brand new 813's and sockets, lots of other "junk box" parts.
>My idea is to have a very simple but high power cw transmitter to use
>for cw QSO's around 1.835mhz.

Can't tell you much about the windows on 160M, but a pair of 813's
will provide 1KW input on CW.  RCA's recommendation for these tubes
was +2,250V on the plate and +400V on the screen.

You can either key the cathode of the finals (by means of a center-
tapped filament transformer) or the oscillator itself.  If you key
only the stages ahead of the final, you'll need either a bias supply,
about -160V, or a clamper tube in the screen circuit.  Alternately,
you could use grid-block keying and key the oscillator, driver(s) and
final simultaneously (preferred, in my opinion).

Depending on the layout, the 813's may or may not need neutralization
and/or parasitic suppressors.  Also, either push-pull or parallel
operation would be fairly easy to implement due to the single-band
design.

This transmitter will be operating straight-through, so be sure all
stages, particularly the oscillator, are well-shielded from the
high-level energy at the final.

73,
Jack  WB3U


From [e-mail] Fri Feb 09 16:59:54 1996
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!msunews!uwm.edu!newsspool.doit.wisc.edu!night.primate.wisc.edu!nntp.msstate.edu!cssun.mathcs.emory.edu!swrinde!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!news
From: [e-mail] (Robert Dengler)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: 82 Repeater in Kansas City/Repeater Use
Date: 2 Feb 1996 21:43:49 GMT
Organization: Image Analysis Systems Group, JPL
Lines: 30
Message-ID: <4eu0il$[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]> <[e-mail]> <4elgqo$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Robert Dengler)
NNTP-Posting-Host: 128.149.10.55
X-Newsreader: IBM NewsReader/2 v1.02
Xref: news.epix.net rec.radio.amateur.policy:33021 rec.radio.amateur.antenna:18930 rec.radio.amateur.equipment:24650 rec.radio.amateur.homebrew:13179 rec.radio.amateur.digital.misc:13998

In <[e-mail]>, [e-mail] (Rob Janssen) writes:
>In <4elgqo$[e-mail]> [e-mail] (Mark Fellhauer
) writes:
>
>>[e-mail] (Rob Janssen) wrote:
>
>>>In <[e-mail]> Eddie Caffray <[e-mail]> wr
ites:
>
>>>> On the 146.85 repeater here in Central NY we had trouble with one user al
so. He made it that
>>>>no one would even monitor the reapeater anymore. The club voted to ban him
 and we did. The
>>>>reapeater is a great place to be again.
>
>>>How do you manage to effectively ban malicious users from a repeater?
>>>Of course this problem is known all over the world, but at least over
>>>here we have not yet found an effective way of stopping them.  How do
>>>you do that?
>

Here's what a local repeater club in So. Cal. did:

-Changed the status of their repeater from 'open' to 'private', so that only
 club members are 'supposed' to use it.

-Got a restraining order prohibiting the undesired user from using the
 repeater.

The restraining order was enforced & the undesired user was forced off the
repeater, along with lots of 'good' non-member users.

Bob NO6B



From [e-mail] Fri Feb 09 16:59:56 1996
Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!news.net99.net!news.corpcomm.net!news.gate.net!news.icix.net!news-w.ans.net!newsfeeds.ans.net!newsjunkie.ans.net!chi-news.cic.net!brutus.bright.net!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: ? Low-/Bandpass for 144MHz and 432MHz
Date: 8 Feb 96 15:55:00 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


Hello,

I was looking for a long time for designs do built tube amplifiers for
144MHz and 432MHz which are able to carry my GS35B providing some kW output.
Now I found suitable and they are just under construction. The days ago I
thought about the third harmonics and I think I need some lowpass or
bandbass filters.

Of course I know that caveties are the best, but they are too heavy. I would
need some designs using standard L/C combinations. For the input I need
filters which can run with about 200W, so some standard designs could be
used. But for the output I need designs which are able to carry 4kW. I
remember a design from ON5FF for his 2*3CX800 144MHz amp, he uses heavy
silver plated copper tube as inductance and short pieces of semi rigid as
capacitances.

My question: do you know anything else, especially for 432MHz?

NB: A simple calculation told me that if I have say 40dB suppression of the
third harmonic and 4kW output it is 0.1W at the harmonic... This should be
suppressed additionally about 10-20dB.
And: If I have 0.5dB loss that is 435W loss... Some people would be happy if
they could reach the power that I would loose, hi. If I allow 100W loss in
the output filter thats about 0.1dB and 50W about 0.05dB, so insertion loss
should be below 0.1dB

vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
                [e-mail]            (Internet)
                HTTP://WWW.SCN.DE/~KOELLNER (WWW)


From [e-mail] Fri Feb 09 16:59:57 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Amplifier
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4f7g7g$[e-mail]>
Date: Thu, 8 Feb 1996 21:16:49 GMT
Lines: 30

In article <4f7g7g$[e-mail]> [e-mail] (Sager Bi
nghalib) writes:
>Hi....
>
> I am trying to build an amplifier for the HF BANDS 25-35 mhz
>generally..... any one knows how ???
>
> Seger Binghalib
>
> [e-mail]

How much power, and what modulations are you going to amplify?
I note you are posting from outside the US, so I won't belabor
the Type Acceptance that would be required here since that doesn't
apply in your case. But we still need to know how much power you
want, the strength of the driving signal, and the type of modulation
in order to answer your question properly.

In general, you use the same type of circuits commonly used for
the lower part of HF, just with some scaling of tuned circuit
values. For modest power, up to the 100-200 watt level, the
amplifier would commonly be solid state. At higher power levels,
vacuum tubes would normally be used (though you can build higher
power amplifiers with solid state too).

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


From [e-mail] Fri Feb 09 16:59:58 1996
Path: news.epix.net!news.sprintlink.net!news.interport.net!imci2!news.internetMCI.com!darwin.sura.net!news.er.usgs.gov!stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone else read Bowick's RF circuit Design?
Date: Thu, 8 Feb 1996 18:54:45 GMT
Organization: Oak Ridge National Lab, Oak Ridge, TN
Lines: 69
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: zaek25.ymd.ornl.gov
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <[e-mail]> Ference Kish <fk
[e-mail]> writes:
>Path: stc06.ctd.ornl.gov!fnnews.fnal.gov!uwm.edu!spool.mu.edu!munnari.OZ.AU!n
ews.mel.connect.com.au!harbinger.cc.monash.edu.au!ns.saard.net!news.adelaide.e
du.au!curlew.mtx.net.au!usenet
>From: Ference Kish <[e-mail]>
>Newsgroups: rec.radio.amateur.homebrew
>Subject: Anyone else read Bowick's RF circuit Design?
>Date: Wed, 07 Feb 96 08:06:53 GMT
>Organization: Microtronics Information Systems
>Lines: 49
>Message-ID: <[e-mail]>
>NNTP-Posting-Host: attila.mtx.net.au
>Mime-Version: 1.0
>Content-Type: TEXT/PLAIN; charset=US-ASCII
>X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage



>Hi!

>  I've just started reading Chris Bowick's RF Circuit Design.

>  I quite like it and recommend it to others, however, there is something tha
t
>  is puzzling me.

>  On pages 34 and 35 the book discusses the loaded Q of a resonant
>  circuit; explains the effect of the source and load resistance on
>  the Q of the tuned circuit.

>  Where I got a bit confused is Eq 2-6 onward. Bowick says that the
>  Q of the circuit is

>        Q = Rp /Xp

>  where Rp is (Rs * Rl) / (Rs + Rl) and Xp is the inductive/capacitive
>  reactance, Rs and Rl are source and load resistance respectively.

>  No worries so far.

>  Then he goes on saying that if we want to optimize the Q of the tank
>  circuit with source/load resistance fixed we need to change Xp thru'
>  the L or C of the circuit. Fair enough.

>  No comes the tricky bit: He than concludes ( if I've read it correctly )
>  that the best way of doing this is by INCREASING the capacitance...

>  I'm not an expert, I'm just starting of, however, from what I heard and
>  tried before, it seemed to me that increasing the L is the better way.

>  I thought the more inductance we have the better the Q of the tuned circuit
>  will be.


>  Mathematically he seems correct if one looks at his example:

>   changing from L=50nH, C=25pF to L=2.5nH and C=500pF @142.35Mhz the Q
>
>  of the second combination seems higher ( load resistance of 50R).


>  Could someone enlighten me, have I misread anything?


>        regards, ference, [e-mail]


You might consider that increaseing the inductance also may increase the
series resistance of the coil.

Danny



From [e-mail] Fri Feb 09 17:00:00 1996
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From: Ference Kish <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Anyone else read Bowick's RF circuit Design?
Date: Wed, 07 Feb 96 08:06:53 GMT
Organization: Microtronics Information Systems
Lines: 49
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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Hi!

  I've just started reading Chris Bowick's RF Circuit Design.

  I quite like it and recommend it to others, however, there is something that

  is puzzling me.

  On pages 34 and 35 the book discusses the loaded Q of a resonant
  circuit; explains the effect of the source and load resistance on
  the Q of the tuned circuit.

  Where I got a bit confused is Eq 2-6 onward. Bowick says that the
  Q of the circuit is

        Q = Rp /Xp

  where Rp is (Rs * Rl) / (Rs + Rl) and Xp is the inductive/capacitive
  reactance, Rs and Rl are source and load resistance respectively.

  No worries so far.

  Then he goes on saying that if we want to optimize the Q of the tank
  circuit with source/load resistance fixed we need to change Xp thru'
  the L or C of the circuit. Fair enough.

  No comes the tricky bit: He than concludes ( if I've read it correctly )
  that the best way of doing this is by INCREASING the capacitance...

  I'm not an expert, I'm just starting of, however, from what I heard and
  tried before, it seemed to me that increasing the L is the better way.

  I thought the more inductance we have the better the Q of the tuned circuit
  will be.


  Mathematically he seems correct if one looks at his example:

   changing from L=50nH, C=25pF to L=2.5nH and C=500pF @142.35Mhz the Q

  of the second combination seems higher ( load resistance of 50R).


  Could someone enlighten me, have I misread anything?


        regards, ference, [e-mail]




From [e-mail] Fri Feb 09 17:00:01 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!gatech!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!news2.acs.oakland.edu!newshub.gmr.com!oldsuna.gmr.com!cmsa
From: [e-mail] (Clyde)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone else read Bowick's RF circuit Design?
Date: Fri, 09 Feb 1996 11:56:18 GMT
Organization: General Motors Research and Development Center
Lines: 6
Message-ID: <4ffuk5$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Clyde)
NNTP-Posting-Host: re3cmc.gmr.com

I believe that your equation is for the loss tangent which is 1/Q.
"Q" is the ratio stored to dissipated energy, and should be
Q=X/R. Clearly X and R give rise to energy stored and dissipated
respectively. I think it's a typo in the book.

73', Clyde.


From [e-mail] Fri Feb 09 17:00:03 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!howland.reston.ans.net!gatech!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone else read Bowick's RF circuit Design?
Date: 9 Feb 1996 18:57:16 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 64
Message-ID: <4fg5ec$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Ference Kish ([e-mail]) asked some questions about
understanding Q of a circuit.  There have been some good replies,
and I'll try not to just repeat what they've written, but maybe a little
different viewpoint will also help.

You can define Q as the energy stored in a resonator divided by the
energy lost per radian of oscillation (or 2*pi*energy stored/energy
lost per cycle).  That definition of Q is valid for any resonator, be
it mechanical, acoustical, lumped-electrical, transmission line, or
cavity -- or others.

So, in a tank circuit connected to a load (including also resistance in a
source if that's appropriate), you can figure the power dissipated in the
load(s) by knowing the voltage across the resistive part or the current
through the resistive part.  From the power and frequency, you can get the
energy dissipated per cycle or per radian.  (You want the _average_ per
radian; don't try to use some particular radian of the cycle, cuz some
have less energy dissipated and some more.)  And in a lumped element tuned
circuit -- L-C circuit -- the energy stored is also pretty easy.  The
energy "sloshes" back and forth between the L and the C, and twice per
cycle essentially all is in the C -- at voltage peaks -- and 90 degrees
out of phase with that, twice more, all is in the L, when the capacitor
voltage is zero and the inductor current is max.  If you know either the
max voltage or the max current, you can get the stored energy easily.
It's just V(peak)^2 * C / 2,  or  I(peak)^2 * L / 2.  You do have to be
careful to understand that that's the peak voltage across the capacitor
and the peak current through the inductor -- some circuit configurations
can confuse this a little.  For example, with series resonance, the
voltage across the (L + C) can be very small compared with the voltage
across the L or the C individually.

OK, in the case Ference mentioned, there is a constant peak voltage, for
a constant power dissipated in the net load resistance, since the
generator and load are each in parallel across the parallel tank.
So, to increase the Q, we need to increase the energy stored in the
tank under the same conditions.  And we do that by making C bigger,
so that the V^2 * C / 2 gets bigger.

If instead you had a series circuit of generator, L, C, and load resistor,
then for constant power in the load, you no longer easily know what the peak
capacitor voltage is.  But you do know that the RMS current in the load is
constant, and since it's a series circuit, the current in the tank is the
same as the load current.  NOW it's obvious that you must increase the
INDUCTANCE to get higher Q, because that increases I^2 * L / 2.

By the way, for most practical inductors, for a given volume and core
material, the unloaded coil Q for a good design is quite insensitive to
the inductance.  That is, if you have an air-core coil 5cm diameter and
10cm long, you can get pretty close to the same Q over perhaps a 100 to
1 range of inductances.  That's the unloaded coil Q at a particular
frequency, and of course not the same at all as the loaded tank Q
discussed above.

This just scratches the surface, but I hope this energy-based viewpoint
helps out.  With it, you can more easily look at other resonant structures
and compare and contrast them to the (perhaps) more familiar lumped LC.
And you can understand easily the loss in a filter by knowing the unloaded
Q of each resonator and its loaded Q...


--
Cheers,
Tom
[e-mail]


From [e-mail] Fri Feb 09 17:00:04 1996
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Jeff Otterson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Arizona Microschip
Date: Tue, 06 Feb 1996 01:16:03 GMT
Organization: MindSpring Enterprises
Lines: 24
Message-ID: <4f6b9o$[e-mail]>
References: <[e-mail]> <4eu5rk$[e-mail]> <4f07e3$me5@newsbf02. <4f3uu1$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: otterson.mindspring.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (John Ballentine) wrote:
>In a previous article, [e-mail] (Clifford Buttschardt) s
ays:

>>Recently, I ran across a reference to Arizona Microchip devices which was
>>interesting.  Does anyone have an address or a clue as what they
>>manufacture?  I suspect it might be  a "STAMP" product but I am not
>>sure.  They have a development kit available too.
>>Cliff Buttschardt   W6HDO   Morro Bay, Calif
>>
>This probably refers to Microchip Technology. They make microcontroller
>chips and do have several development kits available. I don't have the
>address or phone number, but the main offices are here in Chandler, AZ on
>Chandler Blvd.

Check out http://www.ultranet.com/biz/mchip for all your microchip
questions.  All the data sheets, development tools and manuals are
there, and the price is right!

Jeff Otterson
-------------
[e-mail]
Maker and user of tools
PGP key available at http://www.mindspring.com/~otterson/pgp.htm



From [e-mail] Fri Feb 09 17:00:06 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!ip-pdx02-47
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Be a Radio Disk Jockey!
Date: Fri, 09 Feb 96 09:12:50 GMT
Organization: EZNEC Antenna Software
Lines: 10
Message-ID: <4ff351$[e-mail]>
References: <4f68c2$[e-mail]>
NNTP-Posting-Host: ip-pdx02-47.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <4f68c2$[e-mail]>,
   [e-mail] (ARnd2it) wrote:
>Need a Job?  Be a Disk Jockey!
>. . .
>  The money is good, the hours are flexible. . .
>. . .

Wow! Sounds like two things have changed a whole lot since my radio days.

Roy Lewallen, W7EL


From [e-mail] Fri Feb 09 17:00:06 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet
From: Russell Wells <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Books for Sale
Date: 1 Feb 1996 21:56:35 GMT
Lines: 2
Message-ID: <4ercuj$[e-mail]>
References: <4ehp3l$[e-mail]>
NNTP-Posting-Host: chs0023.awod.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

still got them let me know     "Russ"



From [e-mail] Fri Feb 09 17:00:07 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!miwok!pacific.net!usenet
From: "Mr. Brooke Clarke" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: COIL WINDING PROGRAM  (freeware Win95 only)
Date: 7 Feb 1996 07:36:10 GMT
Organization: Rack and Stack Systems
Lines: 7
Message-ID: <4f9kpa$[e-mail]>
References: <4eeig5$[e-mail]> <4ennab$[e-mail]>
NNTP-Posting-Host: ts-30.pacific.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)
To: [e-mail]

What exactly are you looking for in a "coil winding program".  I can give
you some simple calculator formulas depending on your needs.

Have Fun,
Brooke
N6GCE



From [e-mail] Fri Feb 09 17:00:08 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!news.dacom.co.kr!newsrelay.netins.net!imci3!imci4!newsfeed.internetmci.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon
From: Michael Haydon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: controlled carrier AM?
Date: Tue, 6 Feb 1996 17:44:43 -0600
Organization: Olivet Nazarene University
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]> <4f2s7v$[e-mail]>
NNTP-Posting-Host: tiger.olivet.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4f2s7v$[e-mail]>

What is the purpose of a magnetic shunt? will admit to knowing precious
little abt transformer theory. Lots of enthusiasm though. Your further
input welcomed.


On 4 Feb 1996 [e-mail] wrote:

> Michael Haydon <[e-mail]> wrote:
> >Read an article in april 1962 qst regarding controlled carrier amplitude
> >modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w
> >mobile rig. am hoping to put together 300watt or so unit using a pair of
> >microwave oven transformers, but am wondwering abt their audio freq.
> >response.
> >any replies commenting on how much you hate am will be ignored.
> >
> Check out those transformers before you start. I don't know much about
> them but if you look at the iron core you will see a magnetic shunt
> between the primary and secondary. Make sure they will do the job
> for you before you go too far.
> Bill K7NOM
>
>
>


From [e-mail] Fri Feb 09 17:00:09 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon
From: Michael Haydon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: controlled carrier AM?
Date: Tue, 6 Feb 1996 17:41:36 -0600
Organization: Olivet Nazarene University
Lines: 38
Message-ID: <[e-mail]>
References: <[e-mail]> <4f2srh$[e-mail]>
NNTP-Posting-Host: tiger.olivet.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4f2srh$[e-mail]>

160 and 80 meter ham bands, using method where in modulation is supplied
to two sources, one of which is rectified and filter and supplies the Vcc
and the other supplies the modulation, system is CLAIMED to provide 100%
modulation for any audio input level. using microwave oven transformers
because i have two that are identical lying around
Thanks for your input and any constructive criricism is welcome.


On Sun, 4 Feb 1996, Jim Weir wrote:

> Michael Haydon <[e-mail]> wrote:
>
> >Read an article in april 1962 qst regarding controlled carrier amplitude
> >modulation, YES A.M.!!!. anyone tried this technique?
>
> Make my living at it.  Are you referring to controlled carrier as in
> controlling the RF drive to the final stage or controlled carrier as
> in supply half the Vcc to the finals through a modulator that then
> swings from ground to Vcc?
>
> > Article was on 40w
> >mobile rig. am hoping to put together 300watt or so unit using a pair of
> >microwave oven transformers
>
> On what frequencies, and what does a uwave oven transformer have to do
> with it?
>
> Jim
>
>
> Jim Weir VP Engineering  | You bet your sweet patootie I speak
> RST Engineering          | for the company.  I OWN the cotton-
> Grass Valley CA 95945    | pickin' company.
> voice/fax [phone]   | AR Adv. WB6BHI               Cessna 182A N73CQ
> [e-mail]         | Comm'l Pilot & CFI Airplane/Glider  A&P Mechanic
>
>
>


From [e-mail] Fri Feb 09 17:00:10 1996
Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!nntp.inet.fi!news.tele.fi!news.csc.fi!news.eunet.fi!EU.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!in2.uu.net!nntp.crl.com!pacbell.com!unet.net.com!loren!larson
From: [e-mail] (Alan Larson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: controlled carrier AM?
Date: 7 Feb 1996 22:46:20 GMT
Organization: n.o.n.e.
Lines: 13
Message-ID: <4fba3s$[e-mail]>
References: <[e-mail]> <4f2srh$[e-mail]>
NNTP-Posting-Host: loren.net.com

In article <4f2srh$[e-mail]> [e-mail] (Jim Weir) writes:

>Make my living at it.  Are you referring to controlled carrier as in
>controlling the RF drive to the final stage or controlled carrier as
>in supply half the Vcc to the finals through a modulator that then
>swings from ground to Vcc?


  How does this latter choice differ from being essentially plate
(collector) modulation?


        Alan


From [e-mail] Fri Feb 09 17:00:12 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: controlled carrier AM?
Date: 3 Feb 1996 13:01:45 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 52
Sender: [e-mail]
Message-ID: <4f07u9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>Read an article in april 1962 qst regarding controlled carrier amplitude
>modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w
>mobile rig. am hoping to put together 300watt or so unit using a pair of
>microwave oven transformers, but am wondwering abt their audio freq.
>response.
>any replies commenting on how much you hate am will be ignored.
>
>

Controlled carrier AM has the same fidelity as any other AM system, they
are all limited by the skill of the designer.

The idea of controlled carrier AM is to reduce dissipation between words.
So it allows the PA to be used at it's PEP rating rather than it's
continious dissipation rating.

You have to be careful to increase the carrier *before* the modulation
increases, and decrease it *after* the modulation decreases. You can use
controlled carrier with control grid, screen, cathode, or plate
modulation. In my view, it's just one more thing to go wrong for the small
increase in power it provides.

For example, a 100 watt dissipation PA capable of 800 watts PEP can
operate at more than 200 watts carrier output in plate modulated class C
voice operation. That's because efficiency can be well over 70%. (RCA made
a plate modulated AM BCB transmirtter that had 90% plus carrier eff)

The same PA can only operate at 50 watts AM carrier output (200 watts PEP)
in linear or grid modulated service, because the efficiency is restricted
to 33% or less.

With controlled carrier, in theory each PA can operate at the maximum 800
PEP during modulation peaks of short duration with a long cooling off time
in between, but the real world result of normal modulation duty cycles
limit it to a figure more like 400 watts PEP (100 watts carrier). So you
gain 3 dB for a *LOT* of grief in adjustments.

A better solution is to reduce the carrier. The weak carrier can be
filtered and amplified in the receiver and re-injected with the audio
sidebands. Or another carrier can be generated and re-injected in the
receiver. This modulation scheme also can be arranged to remove signal
from one sideband and add it to the other, allowing narrower receiver BW
and improved S/N ratios.You can do this easily in the PA by adding phase
shift to the carrier and audio signals, or by a modulator/filter scheme.

I use this system all the time. If you tune around, you will find other
experimenters using it.

73 Tom


From [e-mail] Fri Feb 09 17:00:13 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec QEX "construction article??"
Date: 5 Feb 1996 16:22:41 GMT
Organization: Dover Research Corp.
Lines: 9
Message-ID: <4f5ash$e3t$[e-mail]>

I thought a software listing was important for my May piece but I've been
convinced that any listings will turn off a large segment of the people who
read QST.  Many guys see computer listings and really get upset.  And as noted
the complete source with comments is available for download.  And believe me
this is how you want users to get it.  Just look at all my typos for the
reason why <grin>  A flowchart?  Humm that might not be a bad idea <kLuNk>
(That was my editor socking my head for saying that) <grin>
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Fri Feb 09 17:00:14 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.mind.net!chi-news.cic.net!newsfeed.internetmci.com!gatech!news.jsums.edu!news.uoregon.edu!news.u.washington.edu!uw-beaver!uw-coco!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec QEX "construction article??"
Date: Thu, 01 Feb 96 16:51:19 PDT
Organization: Northwest Nexus Inc.
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>  <4eoq1i$[e-mail]>
NNTP-Posting-Host: blv-pm1-ip14.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In article <4eoq1i$[e-mail]>,
<[e-mail]> writes:

> We included in the article 100% of the board schematics --
what we
> omitted was the 179 page software listing, which was obviously
> inappropriate anyway.
>
> The design includes a DDS which is controlled either from a
knob
> or a keypad, and includes switching control to support
anyone's
> RF modules to make up to a 10-band radio.
>
> The bulk of the article most certainly is NOT a "kit review"
as
>
> 73,
>
> Tim, WA5VQK and Rand, W1GXN
>
>
>
I Beg to differ, the schematic of a dedicated microprocessor is
trivial compared to the software that operates it.  Even if you
don't feel that the entire program can be included, a complete
and detailed flow diagram can be.  In addition there are sites
available including the arrl web  page where additional files
can be downloaded for those that are interested.

73 de KI7RH Jay Wicklund



From [e-mail] Fri Feb 09 17:00:15 1996
Path: news.epix.net!uunet!in2.uu.net!spool.mu.edu!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec Qex "construction article??"
Date: 2 Feb 96 14:08:48 GMT
Organization: ucsd usenet gateway
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


     I think a good compromise would be to put the software listing on the
     net somewhere and on a dial up BBS.  Anyone who is going to do their
     own programming has got to have a PC and should be able to get a modem
     (even an old 1200/2400 baud!).  If they subscribe and desire to do so
     they could download and print the software and keep it with the
     magazine.  Anyone trying to build it after 3-5 years might have to
     recreate the software unless it made its way to some of the Ham CDs.
     The same could be done for board layouts using .pdf format.  (Boy
     that'll start a flaming thread...)


     I would characterize the article as "construction" as it had full
     schematics and circuit descriptions.

     I would characterize it as useful because of what it contained.  That
     does not mean it could not be more useful by including the parts that
     were omitted!

     It was a more useful article than the antenna tuner (very personal
     opinion).

     Eric Bryan
     KC5EBY


From [e-mail] Fri Feb 09 17:00:16 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy Load
Date: 5 Feb 1996 16:23:32 GMT
Organization: Dover Research Corp.
Lines: 4
Message-ID: <4f5au4$e3t$[e-mail]>

Carbon resistors are around for that low output.  And it depends on your
output freq.
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Fri Feb 09 17:00:17 1996
Path: news.epix.net!news.sprintlink.net!dfw.nkn.net!news.startext.net!news
From: [e-mail] (Charles Knight)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy Load
Date: 5 Feb 1996 23:27:40 GMT
Organization: StarText department of the Fort Worth Star Telegram
Lines: 14
Message-ID: <4f63pc$[e-mail]>
References: <4f3h22$[e-mail]>
NNTP-Posting-Host: dial3.startext.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

 I'm about to complete a small transmitter and need something to use
as
>a dummy load...

A #47 pilot lamp bulb works fairly well. On most SeaLand ships, the HF
RF is passed through a couple of 100 watt household bulbs which offer
lightening protection. It is crude, but it works well. Of course, at 2
watts, a 52 ohm resistor will work well. In fact, it will work up to
about 5 watts intermittant duty as long as it's carbon as most 2 watts
and less are. You could also parallel several larger resistors and get
away with it. At HF and even lower VHF frequencies, it is not too
critical. Radio shack sells a dummy load of about 15 or 20 watts, but
that costs about $20.00 and really isn't necessary.



From [e-mail] Fri Feb 09 17:00:18 1996
Path: news.epix.net!news.sprintlink.net!ratty.wolfe.net!news.aa.net!tsunami.ixa.net!news.ironhorse.com!sloth.swcp.com!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy Load
Date: Mon, 05 Feb 1996 07:10:11 -0800
Organization: JP Accelerator Works, Inc.
Lines: 28
Message-ID: <[e-mail]>
References: <4f3h22$[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6b (Win16; I)
To: Thom <[e-mail]>

Thom wrote:
>
> Hi and thanks in advance for your help,
>
>   I'm about to complete a small transmitter and need something to use as
> a dummy load...The rig should put out about 2 or 3 watts so I was

snip....

If you have any suggestions as to the what's readiliy available, and of
> course economical (!), I'd appreciate your help
>
> tnx es 73
> de
> Tom
> WB2QDG





A few 2 W (or 1 W) carbon composition resistors in parallel (say two 100
ohms, 2 W) will fix you up.  Use short leads and don't expect perfection
at 144 MHz, but it will be adequate for most transmitter testing.  Ask
your friends to look in their junk boxes.  These resistors are now a
couple of dollars each, with a minimum order of 25 from Newark.

de K9GXC, Jim


From [e-mail] Fri Feb 09 17:00:19 1996
Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!news.sics.se!news.funet.fi!news.eunet.fi!EU.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!li.net!thom
From: [e-mail] (Thom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Dummy Load
Date: 4 Feb 1996 23:55:46 GMT
Organization: LI Net (Long Island Network)
Lines: 19
Message-ID: <4f3h22$[e-mail]>
NNTP-Posting-Host: linet01.li.net
X-Newsreader: TIN [version 1.2 PL2]

Hi and thanks in advance for your help,

  I'm about to complete a small transmitter and need something to use as
a dummy load...The rig should put out about 2 or 3 watts so I was
thinking of a power resistor.

However, it is my understanding that a wire-wound resistor will not work
with RF due to the inductance it will produce.

If you have any suggestions as to the what's readiliy available, and of
course economical (!), I'd appreciate your help

tnx es 73
de
Tom
WB2QDG

[e-mail]



From [e-mail] Fri Feb 09 17:00:20 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy Load
Date: 7 Feb 1996 08:41:05 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 35
Sender: [e-mail]
Message-ID: <4faa5h$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>
>A few 2 W (or 1 W) carbon composition resistors in parallel (say two 100
>ohms, 2 W) will fix you up.  Use short leads and don't expect perfection
>at 144 MHz, but it will be adequate for most transmitter testing.  Ask
>your friends to look in their junk boxes.  These resistors are now a
>couple of dollars each, with a minimum order of 25 from Newark.
>
>de K9GXC, Jim
>
>

Hi All,

Everything thing Jim says is true, but I want to add a little bit. We had
a big discussion about this a few months ago.

True non-inductive carbon and metal resistors are very rare, and the one
and two waatters can be very reactive at VHF and UHF. Our plant goes
directly to Allen-Bradley for them and pays about $.30 each for
non-inductive carbon comps in 5000 lots.

Just because the resistor is carbon or metal based (rather than wire
wound) it does not mean it's "non-inductive". As a matter of fact, even if
the resistor specs say "non-inductive" it may not be suitable for some RF
applications. Non-inductive is a very nebulous term.

Cut a sample resistor open and examine the insides (or measure it on a
good analyzer). If it uses a ceramic core with a metal or carbon spiral
for the resistance element....it is inductive. If it is made that way (and
nearly off shelf units are) it may be ok for a load, or it may not. It
will likey be very poor in a critical load like a parasitic supressor.

73 Tom


From [e-mail] Fri Feb 09 17:00:21 1996
Path: news.epix.net!news.sprintlink.net!quiknet3.quiknet.com!calweb!jolt.pagesat.net!pagesat.net!news.uoregon.edu!news.orst.edu!engr.orst.edu!reuter.cse.ogi.edu!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!agate!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy Load
Date: 7 Feb 1996 19:32:10 GMT
Organization: University of Colorado, Boulder
Lines: 13
Message-ID: <4faunq$[e-mail]>
References: <4f3h22$[e-mail]> <4f87so$[e-mail]>
NNTP-Posting-Host: spot.colorado.edu

From Jim Strohm@ausq1ak Wed Feb  7 12:22:29 MST 1996

>[snip]
>These dummy loads work well past VHF frequencies and handle 2 watts
>[snip]                           ^^^^^^^^^^^^^^^

>OK, everybody flame me now.  N6OTQ

I'll bite...

"VHF frequencies" = very high frequency frequencies

Bruce, N6URH


From [e-mail] Fri Feb 09 17:00:23 1996
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy Load
Date: Fri, 09 Feb 96 06:34:34 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 20
Distribution: world
Message-ID: <4fg515$[e-mail]>
References: <4f3h22$[e-mail]> <4f87so$[e-mail]> <4faunq$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (TIEMANN BRUCE) wrote:

>>These dummy loads work well past VHF frequencies and handle 2 watts
>>OK, everybody flame me now.  N6OTQ

>I'll bite...
>"VHF frequencies" = very high frequency frequencies

Actually, the first post was correct.  The phrase "Very High
Frequency" (abbreviated as "VHF") is an adjective.  Despite the fact
that we often treat it as a noun, such use is grammatically incorrect.
"VHF" must be followed by the object it modifies, such as "band",
"frequency", "transmitter", "antenna", etc.

Now, who can find the error in this sentence:  "I are a nit-picker."

:)

73,
Jack  WB3U


From [e-mail] Fri Feb 09 17:00:24 1996
Path: news.epix.net!news.sprintlink.net!news.interport.net!imci2!news.internetMCI.com!darwin.sura.net!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: HyGain TH-3, near new
Date: 8 Feb 1996 09:14:04 -0500
Organization: Harris Controls Division
Lines: 18
Message-ID: <4fd0fc$[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]

This antenna was up last field day for the weekend, and has never seen
any other service. I have a spare trap, the instruction manual, a few
spare trap end caps, and asst. hardware. It is presently partially
assembled (elements and boom). I can leave it that way to save a person
the trouble of re-assembling it. This is in very good shape. I bought
it from a guy that had stored it in his garage and never assembled it.
I am getting rid of it because I don't have room for it on the tower.
I presently have a 3 el 20m monobander up. Meet me at the Orlando hamfest
17-18 February, or other arrangements.  $125


Doug, N4IJ [e-mail]
Palm Bay, Florida [phone] after 6pm est

--
Doug  Snowden
[e-mail]



From [e-mail] Fri Feb 09 17:00:25 1996
Path: news.epix.net!news.sprintlink.net!news.interport.net!imci2!news.internetMCI.com!darwin.sura.net!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: Monster Amplifier Plate Transformer
Date: 8 Feb 1996 09:08:03 -0500
Organization: Harris Controls Division
Lines: 17
Message-ID: <4fd043$[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]

I am re-building my 3-1000 amplifier into a table-top cabinet and am
rebuilding the power supply also. I am getting rid of the plate transformer.
It is built for Gates Radio and is about 6,600 volts @ 1 amp, or 3,300 volts
@ 2 amps. I use it at 3300v for a 3-1000. This brute weighs probably
80 to 90 pounds and is about 18" X 9" X 20" high. Asking $100. I'll drive
an hour or two to meet you. Or you can pick it up and see it in service
first. If you are planning on going to the Orlando hamfest the weekend of
17 February, I can meet you there.

Doug, N4IJ [e-mail]
Palm Bay, Florida
[phone] after 6pm est

--
Doug  Snowden
[e-mail]



From [e-mail] Fri Feb 09 17:00:26 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.west.net!term2-10
From: [e-mail] (Ronald Doctors)
Newsgroups: rec.radio.amateur.homebrew
Subject: GARAGE CLEAR OUT
Date: Tue, 06 Feb 96 17:16:25 GMT
Organization: West.Net Communications
Lines: 3
Message-ID: <4f82d9$[e-mail]>
NNTP-Posting-Host: term2-10.sb.west.net
X-Newsreader: News Xpress Version 1.0 Beta #4

look at http://www.west.net/~rondoc/clearall
I have some old tek scopes and project boxes plus loads of new
small 120-240 - low volst transformers let me know I may have what you need.


From [e-mail] Fri Feb 09 17:00:27 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #28
Date: 1 Feb 96 17:54:10 GMT
Organization: ucsd usenet gateway
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]



<---- Begin Forwarded Message ---->
From: [e-mail]
Subject: Re: Ham-Homebrew Digest V96 #28
To: [e-mail]

I want to make a homepage. I don't know how? Where can I read in the internet
that teach how to construct a home page?

KC5RBM.
<----  End Forwarded Message  ---->



From [e-mail] Fri Feb 09 17:00:28 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!sierra.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!news.ios.com!usenet
From: Walt W., [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #28
Date: 5 Feb 1996 14:09:14 GMT
Organization: Internet Online Services
Lines: 47
Message-ID: <4f532a$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ppp-3.ts-2.la.idt.net
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Hello KC5RBM,

Use a web crawler to search for the info you need. A really good
search engine that I have found is run by DEC and is called
SuperSpider, at URL:

 http://altavista.digital.com

I would suggest that you use the keywords "HTML"  AND " Web Page",

Try the above string. There are so many sources that it is difficult
to list them.

A very good book can be had at BookStar book stores for
around $25, "HTML Publishing on the Internet", by Heslop & Budnick,
and is published by Vantena Press.

ISBN1-56604-229-1.

In addition to learning to write in HTML which is the language of
web page/home page construction, you might also consider CGI
and later Perl.

Good luck,

73's
Walt Williams
[e-mail]


>   [e-mail] writes:
>
>
>  <---- Begin Forwarded Message ---->
>  From: [e-mail]
>  Subject: Re: Ham-Homebrew Digest V96 #28
>  To: [e-mail]
>
>  I want to make a homepage. I don't know how? Where can I read in the intern
et
>  that teach how to construct a home page?
>
>  KC5RBM.
>  <----  End Forwarded Message  ---->
>
>
>>>>



From [e-mail] Fri Feb 09 17:00:28 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Buster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HELP FT-225 or 221 AM Rx Improvement
Date: 7 Feb 1996 17:56:17 GMT
Organization: <Jensen's Catalog Sales> http://aimnet4.aimnet.com/~scot/jensens.html
Lines: 8
Message-ID: <4fap41$[e-mail]>
NNTP-Posting-Host: usr7ip7.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Anybody know a modification for the FT-225 or 221
to improve AM reception?

Please respond via e-mail

Buster, KC7KMJ
[e-mail]



From [e-mail] Fri Feb 09 17:00:30 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!overload.lbl.gov!news.emf.net!gatech!newsfeed.internetmci.com!chi-news.cic.net!ddsw1!news.mcs.net!news.enteract.com!delta.misha.net!news
From: [e-mail] (M Simon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: Wed, 07 Feb 1996 07:20:11 GMT
Organization: Space-Time Productions
Lines: 27
Message-ID: <4f9jkr$[e-mail]>
References: <4d5d0k$[e-mail]> <4d7lvt$[e-mail]> <[e-mail]> <4e9pvl$[e-mail]> <4f1eqp$[e-mail]>
NNTP-Posting-Host: 206.230.95.11
X-Newsreader: Forte Free Agent 1.0.82

ecloud@goodguy (Shawn Ruttledge) wrote:

>While we're on the subject, can anybody identify this MOV (at least I think
>it's an MOV):

><triangle symbol>ZNR
>14K201U
><backwards R>U 46

>It's black, shiny, looks like a disc cap but is a bit too thick to be one of
>those, and I can see through the coating that the leads bend and go to the
>center of the material.  I'd like to find out what the joule rating is for th
ese
>- maybe they'd be useful.  I got a bunch of them in a Circuit Specialists
>mystery box.  My meter says the capacitance is 878 pF.

>--
>  _______                      KB7PWD @ KC7Y.AZ.US.NOAM   [e-mail]
> (_  | |_)                              html: http://www.goodnet.com/~ecloud
> __) | | \__________________________________________________________________
>* OO * Khoros * Linux * robotics * techno * Gravis Ultrasound * X window *

Check the Digikey catalog. Look for equivalent sizes. Also do a
leakage check to find out at what voltage they 'zener.' 1mA of
current vs voltage.

Simon



From [e-mail] Fri Feb 09 17:00:30 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news1.isp.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!prodigy.com!usenet
From: [e-mail] (K Short)
Newsgroups: rec.radio.amateur.homebrew
Subject: HTX-202, HTX-404 external mic mod
Date: 5 Feb 1996 17:35:18 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 6
Distribution: world
Message-ID: <4f5f4m$[e-mail]>
NNTP-Posting-Host: inugap3.news.prodigy.com
X-Newsreader: Version 1.2


There is a mod to overcome the weak external mic audio problem
of the HTX-202 and 404 rigs. Check out :
http://pages.prodigy.com/CA/LA/htx202htx404/htx202htx404.html




From [e-mail] Fri Feb 09 17:00:31 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Interface information for LCD display
Date: 7 Feb 1996 16:10:38 GMT
Organization: Dover Research Corp.
Lines: 11
Message-ID: <4faitu$7ll$[e-mail]>

I'm not sure but I'm pretty sure that this type of display works a lot like
a TTY unit.  Simple ASCII in (with some command handshaking) and you get
text.  Everyone everywhere appears to use the same chipset which is
(I tink) the same ones you mentioned.  I've written some assembler programs
to drive them from a printer port.  The printer port works on except in the
4 bit mode (for unknown reasons) but it lets you try things out.  Note that
the Doc for these things is awful hard to digest.  Working code is worth it
weight in gold so when you get depressed E-Mail me or better yet send a SASE
and I will slip you a disk.  Oh better yet send the disk!
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Fri Feb 09 17:00:32 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!services.arn.net!usenet
From: [e-mail] (Frank M.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood TS120S MOD NEEDED!
Date: Tue, 06 Feb 1996 00:57:53 GMT
Organization: ARNet, Inc.
Lines: 6
Message-ID: <4f691r$[e-mail]>
NNTP-Posting-Host: arnet-209.arn.net
X-Newsreader: Forte Free Agent 1.0.82

I need to find a mod for the Kenwood TS120S for wide recieve, if one
exist. Please post or e-mail me.

Thanks
N5ZLT



From [e-mail] Fri Feb 09 17:00:33 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!news.corp.sgi.com!inn
From: Jim Fellows <jimf>
Newsgroups: rec.radio.amateur.homebrew
Subject: Kits, where to find
Date: 6 Feb 1996 22:11:39 GMT
Organization: Silicon Graphics, Inc.
Lines: 7
Message-ID: <4f8jmr$[e-mail]>
NNTP-Posting-Host: zoinks.corp.sgi.com
Mime-Version: 1.0
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X-URL: news:rec.radio.amateur.homebrew

Subject pretty much says it all.  I'm looking for sources of good quality kits
for VHF/UHF amplifiers, preamps and transverters.

Thanks,

Jim



From [e-mail] Fri Feb 09 17:00:34 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!erinews.ericsson.se!eua.ericsson.se!news.algonet.se!usenet
From: [e-mail] (Christer Johansson)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: L.O.S.A Contribution Form
Date: Tue, 06 Feb 1996 17:11:28 GMT
Organization: HTH
Lines: 72
Message-ID: <4f827k$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sophocles.algonet.se
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Xref: news.epix.net comp.robotics.misc:3008 comp.home.automation:14049 sci.electronics.misc:1151 rec.radio.amateur.homebrew:13187 rec.radio.amateur.misc:97825


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.algonet.se/~cj/losa.html

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
sci.electronics.misc
rec.radio.amateur.homebrew
rec.radio.amateur.misc

[--- 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




From [e-mail] Fri Feb 09 17:00:36 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (SteveBragg)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MIL VCO
Date: 7 Feb 1996 11:27:31 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 36
Sender: [e-mail]
Message-ID: <4fajtj$[e-mail]>
References: <4el6f3$[e-mail]>
Reply-To: [e-mail] (SteveBragg)
Xref: news.epix.net sci.electronics.components:2046 rec.radio.amateur.homebrew:13222

Sir (name not given),

Avantek is the correct name.  They have since sold out to Hewlett-Packard,
and given up the VCO business.  I've used the Avantek VCO's for 3.5 GHz,
and they're really nice and linear.  Sigh.
Oh, well, there are other sources.

The engineering company I work for uses such VCO's, and here are a couple
places we get them:

Z-COMM
9939 Via Parar
San Diego, CA 92126
[phone]

Mini-Circuits
Div. of Scientific Components
P.O. Box 350166
Brooklyn, NY 11235-0003
[phone]

I'm not sure what freq range you're looking for, but both of these
companies provide high-quality linear VCO's from about 150 MHz to at least
3.5 GHz.  I personally have used the Z-COMM parts for 1296 MHz weak-signal
work, and they're relatively cheap ($10-$24 as of about 1 year ago).

The Z-COMM folks were really friendly and willing to sell me only one
VCO (which some places like Mini-Circuits won't do).  Call them for
a catalog.

Mini-Circuits has stuff to 1240 MHz, for less than $20.  Best of luck!

73,

Steve Bragg, KA9MVA
http://members.aol.com/SteveBragg/private/ka9mva


From [e-mail] Fri Feb 09 17:00:37 1996
Path: news.epix.net!news.sprintlink.net!snunews.snu.ac.kr!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!news.dacom.co.kr!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Wanda M Desmond )
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,sci.electronics.design
Subject: Modify cell phone to transceiver?
Date: 5 Feb 1996 09:26:53 GMT
Organization: Netcom
Lines: 12
Message-ID: <4f4igt$[e-mail]>
References: <4d5d0k$[e-mail]> <4d7lvt$[e-mail]> <[e-mail]> <4e9pvl$[e-mail] <4f1eqp$[e-mail]> <4f37f9$[e-mail]>
NNTP-Posting-Host: bak-ca1-08.ix.netcom.com
X-NETCOM-Date: Mon Feb 05  1:26:53 AM PST 1996
Xref: news.epix.net rec.radio.amateur.homebrew:13178 rec.radio.amateur.equipment:24647 sci.electronics.design:2456

Seems I've read on one of the newsgroups a while back of modifying a
cell phone into a transceiver. I picked up a couple of Motorola cell
phones for next to nothing at a "junk" store the other day thinking
they were transceivers (the handset was missing so I didn't know
exactly what they were <g>).

Anyone know if this is possible? And how do you go about it?

Thanks for any help you can give me!

John
KE6TGN


From [e-mail] Fri Feb 09 17:00:38 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.westnet.com!usenet
From: [e-mail] (James P. Ryan)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc
Subject: Re: Morse code to text display wanted
Date: 7 Feb 1996 15:09:27 GMT
Organization: WestNet Internet Services
Lines: 34
Message-ID: <4fafb7$[e-mail]>
References: <4du55d$[e-mail]>  <4e11t1$[e-mail]>
NNTP-Posting-Host: port3.ts2.westnet.com
X-Newsreader: NeoLogic News for OS/2 [version: 4.2 UNREGISTERED 29 days remaining]
Xref: news.epix.net rec.radio.amateur.homebrew:13226 rec.radio.amateur.equipment:24767 rec.radio.amateur.digital.misc:14042

There are two more programs that I am aware of.
The first was published in 73 magazine with source it is called ROBOCOPY.
This one is a copy/read only program with source in "C".

I have also used a program called CW version 1.04 based on the robocopy
program. This one was written by W0NFU, has no source code with it, runs
on an IBM PC.
Both of these programs require a seperate interface to your HF rig.

N2IKO >>>


In message <[e-mail]> -
Ference Kish <[e-mail]> writes:
:>
:>
:>> >
:>> >Hi. My dad is a Ham operator, and asked me if there were some
:>> inexpensive
:>> >way to have incoming Morse code automatically translated and displayed
:>> on
:>> >a CRT. Since I know nothing about Ham radio, I thought I'd post here.
:>
:>There is a program called MORSEFFT which you should be able to find on the n
et
:>(use ARCHIE to find the site storing it )
:>
:>It needs a sound blaster card as an input device. It comes with C source cod
e,
:>too
:>
:>






From [e-mail] Fri Feb 09 17:00:39 1996
Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!maggie.ionsys.com!newspeak.ultratech.net!worldlinx.com!onlink3.onlink.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Manual for Hallicrafter s.w.
Date: 3 Feb 1996 03:12:19 GMT
Organization: Ontario Northland--ONLink
Lines: 7
Message-ID: <4eujqj$[e-mail]>
NNTP-Posting-Host: nrba1_onlink14.onlink.net
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

I need a service manual for the Hallicrafters Radio model TW 2000
this is an all band short wave radio made in the late 40s or early 50s
and I beleive that it was made in Canada. I have two of them and both
need work but the manual is needed in order to do the job right.
Can anyone help?

Neil


From [e-mail] Fri Feb 09 17:00:40 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!newshost.comco.com!news.tamu.edu!news.utdallas.edu!news01.aud.alcatel.com!gatech!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NP0 vs. C0G Capacitors
Date: 6 Feb 1996 22:55:47 GMT
Organization: Continental Cablevision
Lines: 12
Message-ID: <4f8m9j$[e-mail]>
NNTP-Posting-Host: 169.152.167.74
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

I'm seeing conflicting information on the technical specifications (i.e.,
temperature coefficient) of NP0 and C0G capacitors.  Some sources
indicate they're identical; others show slight percentage differences
between the two.  Is there a formal EIA specification for these two
types?

Jordan's "Reference Data for Engineers," seventh edition lists ceramic
capacitors in their respective EIA classes but not in terms of a three
digit designator.

-Paul, N9AZ



From [e-mail] Fri Feb 09 17:00:41 1996
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!fdurt1.fdu.edu!xyzzy.bubble.org!newshost.cyberramp.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (CooperJim)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Opinions - Ramsey SX-20
Date: 4 Feb 1996 03:43:19 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <4f1rj7$[e-mail]>
References: <4e6fps$[e-mail]>
Reply-To: [e-mail] (CooperJim)
NNTP-Posting-Host: newsbf02.mail.aol.com

I built one a couple of years ago.  It worked well and heard plenty
signals with about 20 feet of wire.
It took only an evening and the manual was easy to follow.  It describes
the function of the components as you put them in so its a good learning
experience.
I just sent the 40 meter receiver kit as a gift for my nephew so he can
pick up W1AW from Phila.
The tuning with the single variable resistor is too broad.  Put in the
bandspread one suggested in the manual.

73
Jim Cooper NE6O
[e-mail]


From [e-mail] Fri Feb 09 17:00:42 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsxfer2.itd.umich.edu!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon
From: Michael Haydon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: phone patch project
Date: Sat, 3 Feb 1996 11:48:33 -0600
Organization: Olivet Nazarene University
Lines: 14
Message-ID: <[e-mail]>
References: <4euk48$[e-mail]>
NNTP-Posting-Host: tiger.olivet.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4euk48$[e-mail]>

Try Mendelsons Electronic Surplus in Dayton, Ohio.
Their # 1-800-344-4465


On 3 Feb 1996, David Lawson wrote:

> Does anyone know where I can search for an acoustic coupler? You know; the
> modem used in the movie "Wargames" that required you to physically set the
> handset down on it. Please respond by E-mail.
>                               Thanks,
>                               KF4EBP
>
>
>


From [e-mail] Fri Feb 09 17:00:43 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!newsfeed.direct.ca!usenet
From: [e-mail] (chris coupland)
Newsgroups: rec.radio.amateur.homebrew
Subject: Poor Man's Packet
Date: Wed, 07 Feb 1996 03:39:57 GMT
Organization: Internet Direct
Lines: 10
Message-ID: <4f971p$[e-mail]>
NNTP-Posting-Host: 204.174.248.163
X-Newsreader: Forte Free Agent 1.0.82

Looking for a project article titled "Poor Man's Packet" found in the
August 1991 (pg. 8) of `73: Amateur Radio Today'.
Any help in locating this would be greatly appreciated.

Also looking for other info concerning one chip packet modems to use
in a project. It will be used to send async serial data one way to a
remote PC. Thanks.

Chris.



From [e-mail] Fri Feb 09 17:00:44 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!tuegate.tue.nl!news.IAEhv.nl!news
From: [e-mail] (Eric-Jan W÷sten)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Printer generated transparency problem
Date: Fri, 02 Feb 1996 10:07:55 GMT
Organization: Internet Access Eindhoven, the Netherlands
Lines: 23
Message-ID: <4esraa$[e-mail]>
References: <4ep7jg$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pm2d10.iaehv.nl
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Kenneth Burtchaell) wrote:

>I am experiecing difficulty in getting a good solid blackening in the
>solid trace areas of PCB layout transparencies on my Okidata OL400
>printer.It has been suggested to me that this might be a electro static
>induced problem . Anybody have any good ideas?
>
>      73 Ken W6GHV

I use a HP 4P with the original toner cartridges and HP's
transparencies....only on some traces minor problems...
I use to make really black with an ink-pen...really no
real problem.


\   Eric-Jan Wosten DDS
 \  Best, Holland
  =========================

Internet: [e-mail]
AMPRnet: [e-mail]
AX25:pa3cev@pi8zaa.#bra.nld.eu



From [e-mail] Fri Feb 09 17:00:45 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!gatech!newsfeed.internetmci.com!sierra.net!squaw-d118.sierra.net!user
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: Tue, 06 Feb 1996 06:33:29 -0800
Organization: Engineered Solutions
Lines: 9
Message-ID: <[e-mail]>
References: <4enu4k$[e-mail]> <4eqdr2$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: squaw-d118.sierra.net

A crystal based digital frequency source may be possible with some
increase in elaboration over one or two chips, and the result could well
be more stable than the PTO, however the digital noise (and phase noise)
of the modification will probably (almost certainly) be a step backwards,
and there may be also a new host of idiosyncratic components to
characterize in ways you never thought possible.

Good Luck.
Bob T.


From [e-mail] Fri Feb 09 17:00:46 1996
Path: news.epix.net!news.sprintlink.net!guitar.sound.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet
From: [e-mail] (Glenn E. Little)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: 4 Feb 1996 21:03:44 GMT
Organization: Amateur Radio
Lines: 68
Message-ID: <4f36vg$[e-mail]>
References: <4enu4k$[e-mail]> <4eqdr2$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: chs0053.awod.com
X-Newsreader: WinVN 0.92.6+

In article <[e-mail]>, [e-mail]
e.com (WB3U) says:
>
>First, I want to thank everyone for the excellent ideas and information
>on this subject.
>
>The first two PTO's are back in the rig now and I have had a chance to
>use them on the air for a few days.  They seem to have settled down a
>little, or at least they're not showing the same drift characteristics
>as when they were on the test bench.  I'm not sure why that is, because
>I was testing them in the rig after each change.
>
>At any rate, the initial, slow warmup drift now seems to be downward
>rather than upward, indicating that some additional compensation might
>be needed.  It's not too bad though, and I may leave it as-is.  The
>drift that occurs when I begin transmitting (which is aggravated when
>I use my amplifier because it's next to the rig), is still in an
>upward direction.
>
>This may be the result of a temperature gradient across the PTO
>components (I think it was Cliff who mentioned that possibility).
>Short of potting the PTO or installing a heater, there may not be much
>I can do about this.  I want to mention that the problem isn't all
>that bad, and maybe I'm just being picky.  I was reading an older
>receiver construction article recently titled "An Engineer's Ham-Band
>Receiver", which describes a very well-constructed piece of equipment.
>The author's VFO was built on a custom (heavy) subassembly using a few
>of the parts from a BC-221 frequency meter.  When he talks about how
>good the stability is, he describes it as being within 5 ppm per
>degree (Centigrade, I think).  Now, if my math is correct, that means
>that at a PTO frequency of approximately 5 MHz, a temperature change
>from 70F to 80F could cause a frequency change of as much as 150 Hz.
>Actually, the PTO's I've already worked on are not be too far from that
>kind of stability at this point, at least for initial drift.
>
>I guess what's bothering me most about this is that my old Yaesu
>FT-101EE was like a rock, despite the fact it was a hybrid.  After a
>fifteen minute warmup, I could ragchew for hours on CW without touching
>the dial once.  Maybe this was just luck of the draw; some owners I've
>talked to have apparently had major problems with drift in their 101's.
>
>Anyway, the responses to my original question are enough to keep me
>busy reading, checking components and experimenting for several weeks
>or even months.  As a possible alternative before I start this project
>in earnest, can anyone tell me whether it's feasible to consider
>replacing the PTO's with 5-5.5 MHz synthesizers?  I've missed most of
>the QST/CQ/Ham Radio articles in the last five years so I'm not familiar
>with advances regarding available components.  Is it possible to build
>a synthesizer for this application with 10 Hz resolution at a reasonable
>cost, say with two or three chips?  Or is this the type of design that
>still requires a fairly complex circuit?
>
>Tnx & 73,
>Jack  WB3U


Your drift now may be due to rf heating.
Commercial VFOs use multiple caps in parallel in areas of RF in the
VFO.
This is addressed in the ARRL handbook.
The theory is the RF will distrubute itself across the parallel
caps and reduce the capacitance change due to heating,  The heating
is caused by dielectric loss and RF.

Maybe you can get the thing totally settled dowm.

73
Glenn
WB4UIV


From [e-mail] Fri Feb 09 17:00:47 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: 7 Feb 1996 21:58:35 GMT
Organization: Continental Cablevision
Lines: 8
Message-ID: <4fb7ab$[e-mail]>
References: <4enu4k$[e-mail]> <4eqdr2$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 169.152.167.75
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

Jack:

Additionally, you may want to read Wes Hayward's article in the December,
1993 issue of QST, entitled, "Measuring and Compensating Oscillator
Frequency Drift."

-Paul, N9AZ



From [e-mail] Fri Feb 09 17:00:48 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!newsspool.doit.wisc.edu!news.uwsuper.edu!wpo.uwsuper.edu!pguello
From: [e-mail] (Paul Guello)
Newsgroups: rec.radio.amateur.homebrew
Subject: radio direction finding
Date: 6 Feb 1996 16:04:00 GMT
Organization: University of Wisconsin - Superior, Wisconsin
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: 137.81.10.154

I'm looking for technical information about radio direction finding
eauipment.  Can anyone suggest where to look.  I am especially interested in
how automatic direction finders work.
Thanks, Paul.


From [e-mail] Fri Feb 09 17:00:49 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!newsfeed.pitt.edu!bb3.andrew.cmu.edu!casaba.srv.cs.cmu.edu!fore.com!not-for-mail
From: [e-mail] (Ed Bathgate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Repeater controller speech synth chip?
Date: 9 Feb 1996 11:10:10 -0500
Organization: FORE Systems, Inc.
Lines: 8
Message-ID: <4ffrl2$[e-mail]>
NNTP-Posting-Host: baleen.fore.com
X-newsreader: xrn 7.03


What chips / chipset is used in programmable speech boards on repeater
controllers?  I have noticed several that have quite clear synth speech
and one that even goes from male to female after midnight.

73

Ed N3SDO  [e-mail]


From [e-mail] Fri Feb 09 17:00:50 1996
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!news99.sunet.se!erinews.ericsson.se!eua.ericsson.se!news.algonet.se!news.uoregon.edu!news.orst.edu!engr.orst.edu!reuter.cse.ogi.edu!qiclab.scn.rain.com!psgrain!newsfeed.internetmci.com!in2.uu.net!alterdial.uu.net!not-for-mail
From: "Thomas L. Gaines, Sr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: SB-220 BAND SWITCH REPLACEMENT
Date: 4 Feb 1996 12:28:47 GMT
Lines: 5
Message-ID: <4f28pv$[e-mail]>
NNTP-Posting-Host: 192.251.143.110
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

I am looking for a replacement switch deck(wafer) for the SB-220
amplifier.  If anyone has a substitution, plase give me the source.\\

Tom Gaines/N5ISE



From [e-mail] Fri Feb 09 17:00:51 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail
From: "Thomas L. Gaines, Sr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 BAND SWITCH REPLACEMENT
Date: 6 Feb 1996 12:50:22 GMT
Lines: 4
Message-ID: <4f7iqe$[e-mail]>
References: <4f28pv$[e-mail]> <4f3737$[e-mail]>
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Tnx to Tom and Jim for the response.

73, Tom Gaines/N5ISE



From [e-mail] Fri Feb 09 17:00:52 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 BAND SWITCH REPLACEMENT
Date: 9 Feb 1996 11:52:53 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
Message-ID: <4ffu55$[e-mail]>
References: <4fb65g$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4fb65g$[e-mail]>, Paul Christensen
<[e-mail]> writes:

>
>C'mon Tom...We all know that VHF parasitics are the #1 cause of band
>switch failure. <g>..
>
>-Paul, N9AZ

Yeah right, and photons come down from space and ruin tubes when the amp
is on standby. And fuses work better than electronic overload circuits,
and we can spin a bad tube in a lathe to straighten the filament or grid.

And (as Garth said) monkeys fly out of your butt!

;-)

Tom


From [e-mail] Fri Feb 09 17:00:53 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Edward)
Newsgroups: rec.radio.amateur.homebrew
Subject: SB220 HELP NEEDED
Date: 6 Feb 1996 16:12:25 GMT
Organization: The Electric Playhouse
Lines: 11
Message-ID: <4f7ul9$[e-mail]>
NNTP-Posting-Host: whx-ca6-07.ix.netcom.com
Mime-Version: 1.0
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X-NETCOM-Date: Tue Feb 06  8:12:25 AM PST 1996
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I have a Heathkit SB 220 amp that has a problem with the high voltage
power supply. Every time I key down, the high voltage drops considerbly.
I have heard that the HV supply leaves a lot to be desired and that the
tubes in the amp are not running at their real potential. Does anyone
have any info on how to improve the HV supply in this amp?
I suspect that the caps may be old. Does this sound like it could be
the problem?
Any help would be welcomed.

Thank you.......KC6HVI



From [e-mail] Fri Feb 09 17:00:54 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics going to a web page
Date: 7 Feb 1996 16:06:26 GMT
Organization: Dover Research Corp.
Lines: 19
Message-ID: <4faim2$7ll$[e-mail]>

Hi Kerry, there has been a lot of talk about posting schematics on the net.
Some of the talk has been how (what format) some has been a lot of bandwidth
of the legalities.  I'm more interested in the how.  In my mind a schematic
should be in a machine readably format that can be "used".  So not in GIF,
TIFF etc type "Paint" formats.  Sure you get the info from one place to anothe
r
but if you send me a GIF file of a really neat QRP rig that I want to build
I start by reentering it from scratch.  Thus I term all paint type files as
Engineering Napkins.  You know, like in the old days when the CAD operator
was a draftsman and the engineer was not involved in that stage.  A better
approach is to use some electronic format that includes the parts, connections
and can create a netlist.  One other desired feature is ASCII format so we
can send it back and forth without UUEncoding etc.  My (highly Jaded) view
is to use CIRCAD.  It meets all of the above and the program also works with
OrCAD, Tango, Protel, ACAD and other files.  The demo is free so everyone
can view files.  The demo also lets you write (aprox 32K) files so we can
all exchange small files cheaply.  So, thats my 2 cents worth.  Thanks for
the new WEB Site!
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Fri Feb 09 17:00:55 1996
Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!usenet
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematics going to a web page
Date: Wed, 07 Feb 1996 04:34:27 GMT
Organization: customer of Internet America
Lines: 35
Message-ID: <4f9a50$[e-mail]>
NNTP-Posting-Host: dal22-30.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

Hello again, guys!

Well, I asked before I posted the schematic and got many good
suggestions about where/how to post the schematics.  Now that I've
posted the first one, everyone has been very helpful except for a few
flames from those who didn't appreciate me using up the bandwidth in
the newsgroup.  I knew it might be a hardship on some folks, that's
why I asked first!  Wish they'd have said something before I did it!

To accomodate those who don't want them on the newsgroup, I'll be
sending them to a gentleman who offered to put them on his QRP web
page.  When I finish cleaning up the scans, I'll send him the files
and you can find them there when he has time to upload them.

If there is anyone who doesn't have access to a web browser or can't
get to them, let me know and I'll put the drawings into one big zip
file and send them via email.  The whole lot of them will be around
250Kb, so it won't be unbearable.

Hope this works, I'm sending this note with Eudora and I've never
tried making a mailing list before!  I'll drop a note on the newsgroup
for anybody who misses it.  Thanks for your patience and suggestions.

The web page to watch belongs to:

John R. Cunliffe  N2NEP
[e-mail]
http://www.frontiernet.net/~cunliffe

Keep an eye out for it, maybe the schematics will appear there in the
next week or so.  Make a bookmark!
73,
Kerry Miller




From [e-mail] Fri Feb 09 17:00:56 1996
Path: news.epix.net!news.sprintlink.net!lori.albany.net!news.sover.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon
From: Michael Haydon <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source of crystals?
Date: Fri, 2 Feb 1996 22:50:20 -0600
Organization: Olivet Nazarene University
Lines: 17
Message-ID: <[e-mail]>
References: <4en0gj$[e-mail]>
NNTP-Posting-Host: tiger.olivet.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4en0gj$[e-mail]>

try   1-800-jan-xtal


On 31 Jan 1996, Stan Jacox wrote:

> I'm in the process of refurbing a Motorola Micor T83RTA mobile rig after
> many years of not working on commercial gear and found that I don't have a
> source for xtals.  Apparently the grinders I used to use aren't in
> business anymore.
> Who still makes crystals for the KN1005 and KN1007 TCXOs?  Looking through
> QST didn't reveal a single ad,
>
> Stan Jacox  KM6XZ
> http://www.studio-maint.com/~stanj
>
>
>


From [e-mail] Fri Feb 09 17:00:58 1996
Path: news.epix.net!uunet!in2.uu.net!gatech!news.sprintlink.net!news.icanect.net!news
From: Eliot Fenton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: Thu, 01 Feb 1996 21:50:41 -0800
Organization: Internet Communications of America
Lines: 14
Message-ID: <[e-mail]>
References: <4emtge$[e-mail]> <[e-mail]>
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X-Mailer: Mozilla 2.0b6b (Win16; I)

Cliff:

I found an article in Radio Electronics from March 1988 that details the
construction of a stereo xmitter.  From what I've read in the
alt.pirate.radio group, Rohm makes a chip (BA1404) that does much of the
same thing and is available in an FM kit (FM10 or FM25) from Ramsey.
Unfortunately, most of the responses indicated that the performance was
lackluster.  I downloaded the specs. on the chip, and it has decent
channel separation (45 dB) so I don't understand why it should perform
poorly.

--
Eliot Fenton
[e-mail]


From [e-mail] Fri Feb 09 17:00:59 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!bk296
From: [e-mail] (Gordon Symonds)
Subject: Thordarson T92R21 Transformer Specs
Message-ID: <[e-mail]>
Sender: [e-mail] (Gordon Symonds)
Reply-To: [e-mail] (Gordon Symonds)
Organization: The National Capital FreeNet
Date: Wed, 7 Feb 1996 02:04:57 GMT
Lines: 16


According to Thordarson catalogue #400CX (Spring/Summer 1939), this
transformer is a metal cased, general purpose power transformer:

Primary VA - 150

Secondary  - 800 VAC CT @ 150 ma
             5 VAC @5A
             6.3 VAC CT @ 5A

Dimensions - 4 1/4W x 3 3/4D x 4 7/8H

Weight     - 9 lbs

Hope this is of help.



From [e-mail] Fri Feb 09 17:01:00 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!uw-beaver!newsfeed.rice.edu!bcm.tmc.edu!pendragon!ames!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!tom-dunn.caltech.edu!user
From: [e-mail] (T Dunn)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Thordarson Xfmr Specs sought
Date: Mon, 05 Feb 1996 17:33:10 -0800
Organization: Caltech
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: tom-dunn.caltech.edu


>         I've run across two NOS Thordarson power xfmrs, but
>         have no data on their specs.  The part number is
>
>                         T-92R21
>
>         If some kind soul has a post-WWII Thordarson catalog,
>         I'd appreciate a copy (costs supported, of course),
>         or at least the parameters of this particular xfmr.
>
>         Thanks and 73 de WB6BYH
>
Well the catalog from my file does not show any Thordarson part # begining
with a single letter "T". I also checked a Traid cross reference for
Thordarson part # and no "T" either. I found a Thordarson 26R21 in thier
catalog. It's a 350v CT at 225 Mils with 5v at 3 amps 6.3 at 10 amp and
6.3 at 2.7 amps. Size is 4.75H X  3.75W X 4.5" , Weight is 11.5 lb. The
Thordarson catalog I have is OLD. It list thier phone number as 1200 in
Mt. Carmel Illinois. That right only 4 digits. If the Xformer above is not
close to the size you have give me some specks, and I'll see if I can find
a match.   73 Tom

[e-mail]


From [e-mail] Fri Feb 09 17:01:01 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TT 22 Valve
Date: Mon, 5 Feb 1996 18:53:38 -0800
Organization: Call America Internet Services  [phone]
Lines: 4
Message-ID: <[e-mail]>
References: <4enu4k$[e-mail]> <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Does anyone know of an American replacement for the TT 22 tube?  It
appears to be a sweep tube of some sort.  A pair is used in a marine SSB
radio made in Denmark.  Alternately, a source for the tube in the USA
would be appreciated.  Cliff Buttschardt   W6HDO


From [e-mail] Fri Feb 09 17:01:02 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Pierpaolo Sardelli)
Newsgroups: rec.radio.amateur.homebrew
Subject: vfo.zip file attachment corrupted
Date: 7 Feb 96 22:59:23 GMT
Organization: ucsd usenet gateway
Lines: 17
Message-ID: <v02130500ad3e7b1fbd77@[194.21.198.12]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hi all !

I received from the Mailing List a corrupted file... i tried to fetch it
twice from my server, but having always the same modem.
Can anyone of you send it again to me, please ?

Thanks a lot !

 - Pierpaolo -
e-mail   [e-mail]


_____________________________
Pierpaolo Sardelli
E-mail: [e-mail]




From [e-mail] Fri Feb 09 17:01:03 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!marlin.ucsf.edu!overload.lbl.gov!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!csnews!coopnews.coop.net!news.den.mmc.com!usenet
From: "joseph c. hawkins" <claven.den.mmc.com>
Newsgroups: rec.radio.amateur.homebrew
Subject: VOX Circuit?
Date: 5 Feb 1996 22:45:06 GMT
Organization: Lockheed Martin -- Denver  InterNetNews site
Lines: 6
Message-ID: <4f619i$[e-mail]>
NNTP-Posting-Host: mac-athena.den.mmc.com
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X-URL: news:rec.radio.amateur.homebrew

Any sample VOX circuits or info of where to get info would be greatly
appreciated.

Thanks




From [e-mail] Fri Feb 09 17:01:03 1996
Path: news.epix.net!news.sprintlink.net!hookup!gatech!newsfeed.internetmci.com!news1.isp.net!news.isp.net!not-for-mail
From: "Michael M. Butler" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Want dual jack assembly for spkr-mic
Date: Mon, 05 Feb 1996 14:35:29 -0800
Lines: 6
Message-ID: <4f60ql$[e-mail]>
NNTP-Posting-Host: sc152.isp.net
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NNTP-NEWS-ADMIN: [e-mail]
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I've got a couple of aftermarket MFJ-285 speaker-mics that have a
2-conductor mini plug and a *3*-conductor micro plug.  I'm looking
for a source for the compatible dual jack assembly.  Anyone know
of a source?  Thanks...

Michael M. Butler      [e-mail]


From [e-mail] Fri Feb 09 17:01:04 1996
Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!dns.crocker.com!calweb!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: 10 Ghz Door Opener Sources
Date: 5 Feb 1996 16:57:38 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 18
Message-ID: <4f5cu2$[e-mail]>
References: <[e-mail]> <4f05ba$[e-mail]> <[e-mail]>
NNTP-Posting-Host: sac1-27.calweb.com
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To: [e-mail]

Neil Gjere <[e-mail]> wrote:
>[e-mail] wrote:
>>
>> Neil Gjere <[e-mail]> wrote:
>> >I'm looking for a source of the 10 Ghz Gunns used in Door Openers.

>BTW, any sources for those units mentioned in your previous post???
>
>Neil, N0PFZ

Well Neil I have a few extras and I think there are a hundred or so
in town at a dealer in scrap. Also I think there are some in a scrap
metel yard but they have been out in the rain. These units are not
the SOLFAN type and use a PILL type diode. How many do you want?
The price would vary depending on who supplies them. I paid $1.00 each
from the metal dealer (before the rain came).
Bill K7NOM



From [e-mail] Fri Feb 09 17:01:05 1996
Path: news.epix.net!uunet!in2.uu.net!skypoint.com!usenet
From: Neil Gjere <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: 10 Ghz Door Opener Sources
Date: Thu, 01 Feb 1996 20:07:20 -0600
Organization: GjereRig Inc.
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: dial104.skypoint.net
Mime-Version: 1.0
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X-Mailer: Mozilla 2.0b6a (Win95; I)

I'm looking for a source of the 10 Ghz Gunns used in Door Openers.
I'm specifically looking for Solfans or Other cavities that include a
Varactor as well as the Gunn diode in the housing.

I have several cavities that have just the Gunns in them, and would like
to experiment with other designs.

73s,

Neil N0PFZ


From [e-mail] Fri Feb 09 17:01:06 1996
Path: news.epix.net!uunet!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!calweb!calweb!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: 10 Ghz Door Opener Sources
Date: 3 Feb 1996 17:17:30 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 17
Message-ID: <4f05ba$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sac1-9.calweb.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)

Neil Gjere <[e-mail]> wrote:
>I'm looking for a source of the 10 Ghz Gunns used in Door Openers.
>I'm specifically looking for Solfans or Other cavities that include a
>Varactor as well as the Gunn diode in the housing.
>
>I have several cavities that have just the Gunns in them, and would like
>to experiment with other designs.
>
>73s,
>
>Neil N0PFZ
I also have GUNN units that have a detector diode. I have found
that I could bias the diode and use it as a Varactor and get some
usable FM deviation. I havent seen any alarm units or door openers
that have the Varactor.
Bill K7NOM



From [e-mail] Fri Feb 09 17:01:07 1996
Path: news.epix.net!news.sprintlink.net!hideout.emanon.net!alpha.sky.net!winternet.com!guitar.sound.net!imci5!imci4!newsfeed.internetmci.com!vixen.cso.uiuc.edu!qualcomm.com!kbanke-mac.qualcomm.com!user
From: [e-mail] (Kerry Banke)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: info on ASI Satellite Controlled Clock
Date: 5 Feb 1996 14:59:58 GMT
Organization: Qualcomm
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: kbanke-mac.qualcomm.com

At a flea market I picked up a Satellite Controlled Clock model1026B made
by Arbiter Sysytems Inc.  I'm looking for any general info on this unit as
I'd like to fire it up if practical.  The front end appears to be tuned
for the 470 MHz range so I'm wondering if it really uses a satellite in
this range or if it uses a down converter at the antennna. Any info would
be greatly appreciated.
 - Kerry N6IZW -


From [e-mail] Fri Feb 09 17:01:08 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet
From: [e-mail] (Glenn E. Little)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: info on ASI Satellite Controlled Clock
Date: 8 Feb 1996 21:02:14 GMT
Organization: Amateur Radio
Lines: 29
Message-ID: <4fdocm$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: chs0105.awod.com
X-Newsreader: WinVN 0.92.6+

In article <[e-mail]>, kbanke@qualcomm.
com (Kerry Banke) says:
>
>At a flea market I picked up a Satellite Controlled Clock model1026B made
>by Arbiter Sysytems Inc.  I'm looking for any general info on this unit as
>I'd like to fire it up if practical.  The front end appears to be tuned
>for the 470 MHz range so I'm wondering if it really uses a satellite in
>this range or if it uses a down converter at the antennna. Any info would
>be greatly appreciated.
> - Kerry N6IZW -


The Military used a sat. system called "TRANSIT" to provide positional
data to ships at sea.  This system used frequencies of 149.9995 and 399.9995
MHz (I believe these are correct).  The computer would determine the position
of the platform it was located on by recording the doppler shift of the
signal transmitted from the bird. It would compare this to an internally
generated doppler curve based on assummed position and sat. orbital
parameters.

The sat would xmit data every even two min.  This was known as a Barker
word.  This data contained very accurate time.

Possibly this is the functiion of your unit.

Transit I belive is no longer operational.  When operational it could be heard
 on a scanner.

73
Glenn
WB4UIV


From [e-mail] Fri Feb 09 17:01:09 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!news.spss.com!uchinews!news.luc.edu!newsfeed.acns.nwu.edu!math.ohio-state.edu!usc!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!apollo.hp.com!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Thu, 1 Feb 1996 16:16:40 GMT
References: <4ee9o0$[e-mail]>
Nntp-Posting-Host: hpqmocc.sqf.hp.com
Organization: Hewlett-Packard LTD, South Queensferry, Scotland
Lines: 18

Roy Lewallen ([e-mail]) wrote:

: It's one of the Great Inventions of
: the 20th Century (along with latex paint and plastic drinking
: straws. .)


  WD40, latex paint, and plastic drinking straws ?

   Roy,  *WHAT* were you making?


    Cheers,
            David GM4ZNX


   G3RJV tells me you're intending making a foray to this side of the
ocean.....


From [e-mail] Fri Feb 09 17:01:10 1996
Path: news.epix.net!uunet!in2.uu.net!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Date: 3 Feb 1996 12:53:07 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <4f07e3$[e-mail]>
References: <4eu5rk$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail] (Patrick Croft) writes:

>ing in an oven at 135 degrees for
>about 30-60 min. after the bath.  The cleanser used was called 'Swipe",
>and the currently marketed 'SimpleGreen' appears to be same stuff.

Be careful. My mother in law rubbed Simple Green on her car and it took
the paint off!!!!!!!!!!!!!!!!

73 Tom


From [e-mail] Fri Feb 09 17:01:11 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!nctuccca.edu.tw!news.cc.nctu.edu.tw!news.csie.nctu.edu.tw!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Where can I find GPS protocol format?
Date: Wed, 07 Feb 1996 12:27:01 GMT
Organization: Dept. Comp. Sci. & Info. Eng., Chiao-Tung Univ., Taiwan
Lines: 10
Message-ID: <4fa5qa$[e-mail]>
NNTP-Posting-Host: @a237172.nctu.edu.tw
X-Newsreader: Forte Free Agent 1.0.82

        I want to DIY a  GPS receiver. I am familiar with spred-spectrum
systems, but no idea about the protocol of GPS signals. Is there any
ftp site that I can get a detail information about the signal format?
Or, is there any tecnical book has the detail description of GPS
signal? Thanks in advance!

fred kuo
BV3DH,   [e-mail]




From [e-mail] Fri Feb 09 17:01:12 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.ghgcorp.com!usenet
From: "Ros St. John" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: TOWER/ANTENNAE
Date: Tue, 06 Feb 1996 22:38:08 -0800
Organization: GHG Corporation
Lines: 20
Message-ID: <[e-mail]>
NNTP-Posting-Host: dialupline73.ghgcorp.com
Mime-Version: 1.0
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X-Mailer: Mozilla 2.0 (Win16; I)

Hi.  Due to a tornado, my tower and antennae are now junk.

STATE FARM INSURANCE REFUSES TO PAY CLAIM!!!!!  BEWARE!!!!

I am looking for a used TRI-EX/HYGAIN LM-354 tower or at the very
least, the center section thereof.

Want used HYGAIN TH-7DXS OR TH-11.

Want used CUSCHCRAFT 2 METER BOOMER.

Want M2 1.2 gig atv antenna.

Want AEA OR  M2 434 mhz. atv antenna.

Thank you.

W5BRY, Ros.

my email is [e-mail]


From [e-mail] Tue Feb 13 21:00:30 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!imci3!imci4!newsfeed.internetmci.com!news.bctel.net!news.island.net!news.qb.island.net!K
From: [e-mail] (ken madsen)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2020 Mods Radio Shack WANTED
Date: 9 Feb 1996 03:09:37 GMT
Organization: Island Internet Customer
Lines: 6
Message-ID: <4fedth$[e-mail]>
NNTP-Posting-Host: slip22.qb.island.net
To: ALL
X-Newsreader: News Xpress Version 1.0 Beta #3

Does any body have good frequence mod for a Radio Shack 2020 base mobile
scanner...

EMAIL ME ...

[e-mail]


From [e-mail] Tue Feb 13 21:00:31 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!newshost.vu.nl!cs.vu.nl!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: 82 Repeater in Kansas City
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]>   <[e-mail]> <[e-mail]>   <[e-mail]> <4ete1q$[e-mail]>
Date: Tue, 6 Feb 1996 22:41:41 GMT
Lines: 17
Xref: news.epix.net rec.radio.amateur.policy:33052 rec.radio.amateur.antenna:18989 rec.radio.amateur.equipment:24803 rec.radio.amateur.homebrew:13253 rec.radio.amateur.digital.misc:14059

In <4ete1q$[e-mail]> [e-mail] (Dean Denter) writes:

>Every radio has a "unique" pattern when you key it (due to differences
>in the components etc), this pattern can be used to identify a radio.
>There is no encrypted signal or anything that fancy.

I have my doubts about the uniqueness of the pattern generated by
same-type transmitters...  and the stability of the pattern as a
function of temperature, time etc.
But it seems another sub-thread starts to discuss this.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Tue Feb 13 21:00:33 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!gatech!newsfeed.internetmci.com!in2.uu.net!news-m01.ny.us.ibm.net!ausnews.austin.ibm.com!geraldo.cc.utexas.edu!usenet
From: Bruce Bostwick <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 913 or 2AP1 CRT?
Date: 6 Feb 1996 22:05:51 GMT
Organization: tangled hierarchy, man..
Lines: 11
Message-ID: <4f8jbv$[e-mail]>
NNTP-Posting-Host: pcl-a75.lib.utexas.edu
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X-URL: news:rec.radio.amateur.homebrew

Willing to either buy one, or barter whatever you find listed in
http://ccwf.cc.utexas.edu/~lihan/tube_catalog.html is worth one, for a
project I'm planning.  I've already (maybe) located a 2AP1 and a 2BP1,
but got pointed here from news:sci.electronics.misc by someone that
said I might have more luck here.

Email link available on my home page.  Thanks!  ;-)

<BGB>  http://ccwf.cc.utexas.edu/~lihan/




From [e-mail] Tue Feb 13 21:00:35 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: Any Interest in Some Filters?
Reply-To: [e-mail]
Organization: MOTOROLA
Date: Tue, 13 Feb 1996 15:03:43 GMT
Message-ID: <[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
Lines: 31

I have a number of crystal filters laying around that
might be of interest to the experimenter community here.

These are 11.4 MHz available in both USB and LSB.  The
passband is about 300 to 2900 Hz, with 5 db of insertion
loss, and 21 to 29 db of carrier supression.  These
values represent typical numbers I have seen on several
samples that apparently have been measured at one time or
another.

These filters are composed of a set of three individual
filters that are cascaded.  More could be cascaded together
for steeper skirt response.  It may be possible to narrow
the response (as is done in normal ladder filters) by using
larger termination load capacitance.

I myself have not used these, so I don't know the terminating
resistance or the load capacitance to get the desired filter
shaping.

If you are interested, I am asking $5.00 per set and I will
pay for shipping.  Please indicate if you want Upper Sideband
or Lower Sideband or if you really don't care.

Thanks!

- Dan Tayloe, WB0NVB, Phoenix, AZ






From [e-mail] Tue Feb 13 21:00:37 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci5!imci4!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Chris Bowick, WD4C <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:  Anyone else read Bowick's RF circuit Design?
Date: 11 Feb 1996 05:58:55 GMT
Organization: RF Circuit Design
Lines: 25
Message-ID: <4fk0iv$cpl$[e-mail]>
References: <[e-mail]>

Thank you all for your very nice comments about my book RF
Circuit Design.  I'm glad that you have found it useful.  I
originally wrote the book because I was unable to find a text on
the topic that could adequately explain the in-depth RF theory
the way I felt it needed to be explained---with detailed example
problems and step-by-step solutions.

The book was originally published by Howard W. Sams, which was
later bought out by Macmillan, and is still going strong.

Kish, Curtis, and Coffman et.al. did a great job of providing
further explanation of Xp as it relates to Q of resonant
circuits.

I am considering an update to the book (2nd Edition) and would be
interested in any input, suggestions, corrections, etc. that any
of you might have.  Perhaps we can make it an even better
reference book in the future!

Thanks again!  Enjoy!

Chris Bowick, WD4C

--
Chris Bowick, WD4C, Author, RF Circuit Design


From [e-mail] Tue Feb 13 21:00:38 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!overload.lbl.gov!agate!howland.reston.ans.net!newsfeed.internetmci.com!castle.nando.net!news
From: steve harris <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone else read Bowick's RF circuit Design?
Date: Mon, 12 Feb 1996 05:04:19 -0500
Organization: News & Observer Public Access
Lines: 74
Message-ID: <[e-mail]>
References: <[e-mail]> <4fg0ob$[e-mail]>
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michael silva wrote:
good book.  Try KBR (krauss, Bastion, Raab) for more rigor.
One explanation for your confusion is as follows:

        f0 = K * (LC)^0.5, K is constant (1/2pi)

        given f0, raising C will "lower" L, this I think
        you know.

        Now remember that an inductor is manufactured from
        some REAL world material (usually metal), eg wire.

        Same for the cap.

        Turns out that the losses in the
        cap's dielectric (and any other effects) are much
        lower than the losses in an inductor of comparable
        impedence.  The inductor's losses are almost all
        due to the resistence.

        Hope this helps.

        steve


>
> In <[e-mail]> Ference Kish
> <[e-mail]> writes:
>
> >  On pages 34 and 35 the book discusses the loaded Q of a resonant
> >  circuit; explains the effect of the source and load resistance on
> >  the Q of the tuned circuit.
> >
> >  Where I got a bit confused is Eq 2-6 onward. Bowick says that the
> >  Q of the circuit is
> >
> >       Q = Rp /Xp
> <...>
> >  No comes the tricky bit: He than concludes ( if I've read it
> correctly )
> >  that the best way of doing this is by INCREASING the capacitance...
> <...>
> >  I thought the more inductance we have the better the Q of the tuned
> circuit
> >  will be.
>
> This is often confusing (to me as well), because whether you use R/X or
> X/R depends on whether you're talking about a parallel or series
> circuit.  These definitions of 'Q' are just derived from the more
> fundamental meaning (ratio of 'lossless' power to power dissipated), so
> it helps to go back to the fundamental meaning when thinking of X's and
> R's.  In a parallel tuned circuit, such as the one in your example, the
> voltage across the circuit is the independant variable (kind of...), so
> to increase the ratio of lossless power to dissipated power you need to
> increase the ratio of current thru the X's to current thru the R.  You
> do this by decreasing the X's (higher C, lower L).  Another way to look
> at this is that lower X's in a parallel circuit will shunt the voltage
> across the circuit faster as you move away from resonance, thus giving
> the sharper peak of a higher-Q circuit.
>
> For series circuits the situation is reversed, with current being the
> independant variable (again, kind of...).  Here the way to increase the
> ratio of lossless power to dissipated power is to increase the voltages
> across the X's by making them larger (lower C, higher L).  Then as you
> move away from resonance the dominant X (the one that's rising) will
> reduce the current faster, resulting in a sharper peak once more.
>
> I know I've done a lot of hand-waving here, but I've tried to explain
> it in an intuitive way.  Hope it was helpful.
>
> BTW, I think Bowick's book is great.
>
> 73,
> Mike, KK6GM


From [e-mail] Tue Feb 13 21:00:39 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!khis_news.khis.kodak.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Anyone else read Bowick's RF circuit Design?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Fri, 9 Feb 1996 09:14:02 GMT
Lines: 60

In article <[e-mail]> Ference Kish <fk
[e-mail]> writes:
>  I've just started reading Chris Bowick's RF Circuit Design.
>
>  I quite like it and recommend it to others, however, there is something tha
t
>  is puzzling me.
>
>  On pages 34 and 35 the book discusses the loaded Q of a resonant
>  circuit; explains the effect of the source and load resistance on
>  the Q of the tuned circuit.
>
>  Where I got a bit confused is Eq 2-6 onward. Bowick says that the
>  Q of the circuit is
>
>       Q = Rp /Xp
>
>  where Rp is (Rs * Rl) / (Rs + Rl) and Xp is the inductive/capacitive
>  reactance, Rs and Rl are source and load resistance respectively.
>
>  No worries so far.
>
>  Then he goes on saying that if we want to optimize the Q of the tank
>  circuit with source/load resistance fixed we need to change Xp thru'
>  the L or C of the circuit. Fair enough.
>
>  No comes the tricky bit: He than concludes ( if I've read it correctly )
>  that the best way of doing this is by INCREASING the capacitance...
>
>  I'm not an expert, I'm just starting of, however, from what I heard and
>  tried before, it seemed to me that increasing the L is the better way.
>
>  I thought the more inductance we have the better the Q of the tuned circuit
>  will be.
>
>
>  Mathematically he seems correct if one looks at his example:
>
>   changing from L=50nH, C=25pF to L=2.5nH and C=500pF @142.35Mhz the Q
>
>  of the second combination seems higher ( load resistance of 50R).
>
>
>  Could someone enlighten me, have I misread anything?

Two things are at work here. First, when the value of C is increased,
the value of Xc *decreases*, but when the value of L is increased,
XL *increases*. Now since Q is Rp/Xp, the *smaller* we can make
Xp, the higher the resulting Q. The second thing at work, and not
shown in this example, is that most of the circuit intrinsic R
is in the inductor. All other things equal, reducing L also reduces
intrinsic R. Now that's usually only significant for lightly loaded
circuits, but it is another factor favoring high C low L circuits.
As Q increases, so do circulating currents, and the intrinsic R
of the circuit begins to play a larger role in ultimate Q.

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


From [e-mail] Tue Feb 13 21:00:40 1996
Path: news.epix.net!uunet!in1.uu.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet
From: Philip Manning <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Apologises for multiple mailings.
Date: 13 Feb 1996 12:58:34 GMT
Organization: University of Surrey, Guildford, England
Lines: 4
Message-ID: <4fq1tq$[e-mail]>
NNTP-Posting-Host: olympus.ee.surrey.ac.uk
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Sorry folks, murphy's law occurred, re my mailing on Icom IC-2SAT article.

Phil Manning G1LKJ



From [e-mail] Tue Feb 13 21:00:41 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Arizona Microschip
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]> <4eu5rk$[e-mail]> <4f07e3$me5@newsbf02. <4f3uu1$[e-mail]> <4f6b9o$[e-mail]>
Date: Thu, 8 Feb 1996 20:16:46 GMT
Lines: 17
Sender: [e-mail]

in <4f6b9o$[e-mail]>, Jeff Otterson wrote:
: [e-mail] (John Ballentine) wrote:
: >In a previous article, [e-mail] (Clifford Buttschardt)
 says:
: >>Recently, I ran across a reference to Arizona Microchip devices which was
: >>interesting.  Does anyone have an address or a clue as what they
: >>manufacture?  I suspect it might be  a "STAMP" product but I am not
: >>Cliff Buttschardt   W6HDO   Morro Bay, Calif

: Check out http://www.ultranet.com/biz/mchip for all your microchip
: questions.  All the data sheets, development tools and manuals are
: there, and the price is right!

Also www.parallaxinc.com for the web page for the makers of the
Basic Stamp.

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



From [e-mail] Tue Feb 13 21:00:42 1996
Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Arizona Microschip
Date: Tue, 13 Feb 1996 09:41:01 -0800
Organization: Call America Internet Services  [phone]
Lines: 31
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Thanks Paul for the reply.  Appreciate your help.  Cliff Buttschardt W6HDO

On 9 Feb 1996, Paul Ostby wrote:

>
> > Recently, I ran across a reference to Arizona Microchip devices which was
> > interesting.  Does anyone have an address or a clue as what they
> > manufacture?  I suspect it might be  a "STAMP" product but I am not
> > sure.  They have a development kit available too.
> > Cliff Buttschardt   W6HDO   Morro Bay, Calif
>
> Microchip Technology Inc. manufactures some nifty CMOS microcontrollers.  I'
ve
> used them for several years now.  They are hard to beat for high speed, low
> power, and low cost.  The address  from their most recent databook is:
>      Microchip Technology Inc.
>      2355 West Chandler Blvd.
>      Chandler, AZ  85224-6199
>      Tel: [phone]
>      Fax: [phone]
>
> Microchip also manufactures various EPROMs, EEPROMs, an LCD controller, and
some
> other miscellaneous chips.  You can download datasheets from their web site
at:
>      http://www.ultranet.com/microchip
>
> The BASIC Stamp is manufactured by Parallax, Inc.  The Stamp uses a Microchi
p
> controller for the CPU, but Parallax adds an EEPROM and a BASIC interpreter.
>
> Paul Ostby,    KC7CKU
>
>
>


From [e-mail] Tue Feb 13 21:00:43 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.tc.cornell.edu!news.cac.psu.edu!news.math.psu.edu!chi-news.cic.net!newsfeed.internetmci.com!in2.uu.net!news.ner.bbnplanet.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Be a Radio Disk Jockey!
Date: 12 Feb 1996 14:10:37 GMT
Organization: Continental Cablevision
Lines: 13
Message-ID: <4fnhot$[e-mail]>
References: <4f68c2$[e-mail]> <4ff351$[e-mail]>
NNTP-Posting-Host: 169.152.167.73
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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To: [e-mail]

>>  The money is good, the hours are flexible. . .
>>. . .
>
>Wow! Sounds like two things have changed a whole lot since my radio days.
>
>Roy Lewallen, W7EL

Since these two things haven't changed in twenty years, I left the dead
broadcasting industry last year.  It's a loser unless you're 100% into
sales.

-Paul, N9AZ



From [e-mail] Tue Feb 13 21:00:44 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!zippy.cais.net!news
From: Jim Sutton/AC4CZ
Newsgroups: rec.radio.amateur.homebrew
Subject: Computer Control of FT-1000
Date: 7 Feb 1996 03:38:43 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 7
Message-ID: <4f96s3$[e-mail]>
NNTP-Posting-Host: ppp20.erols.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Would appreciate any information on computer control of FT-1000 and
also FT-736R.

Many thanks,

73/Jim/AC4CZ
[e-mail]


From [e-mail] Tue Feb 13 21:00:45 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy Load
Date: 9 Feb 1996 20:37:10 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 14
Sender: [e-mail]
Message-ID: <4fgss6$[e-mail]>
References: <4fg515$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4fg515$[e-mail]>,
[e-mail] (WB3U) writes:

>Now, who can find the error in this sentence:  "I are a nit-picker."
>
>:)
>
>73,
>Jack  WB3U

The error is you left the J off. The correct phrase is "JI are a
nit-picker" not "I are a nit picker".

73 Tom W8JI


From [e-mail] Tue Feb 13 21:00:46 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!swidir.switch.ch!in2p3.fr!usenet
From: Jean Marie Bussat <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Function and pinout for some RF IC
Date: 13 Feb 1996 14:07:10 GMT
Organization: Centre de Calcul In2p3
Lines: 26
Message-ID: <4fq5ue$[e-mail]>
NNTP-Posting-Host: lapphp.in2p3.fr
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.04 9000/897)
X-URL: news:rec.radio.amateur.homebrew

Hello,

Does anybody have (or may tell me where I can find) the pinout
and the function of the following IC's.

CX 7925 (nothing from Sony's Web site)
TC 5081 (nothing from Thoshiba)
TC 5082
TA 7310
HD 1055 (nothing from Hitachi)

There are in the PLL section of a RANGER RCI2950 tranceiver and
I want to understand how does it work. I've made some deductions
but I don't think they're all right.

Thanks for any kind of help.

Jean-Marie

+---------------------------------------------------------------+
| Jean-Marie Bussat - Laboratoire d'Annecy-le-vieux de Physique |
| des Particules - BP 110 - 74941 ANNECY-LE-VIEUX - FRANCE      |
| Email: [e-mail]                                   |
| Tel: [phone]                   Fax: [phone] |
+---------------------------------------------------------------+



From [e-mail] Tue Feb 13 21:00:47 1996
Path: news.epix.net!news.sprintlink.net!news.accessone.com!news
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.space,rec.radio.amateur.antenna,,rec.radio.amateur.equipment,rec.radio.amateur.policy,rec.radio.scanner,rec.radio.shortwave
Subject: Ham Radio Online goes Interactive! Check us out!
Date: 12 Feb 1996 16:20:22 GMT
Organization: Virtual Publishing Co.
Lines: 44
Message-ID: <4fnpc6$[e-mail]>
NNTP-Posting-Host: vbook.accessone.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5
Xref: news.epix.net rec.radio.amateur.misc:98010 rec.radio.amateur.digital.misc:14099 rec.radio.amateur.homebrew:13295 rec.radio.amateur.space:6310 rec.radio.amateur.antenna:19025 rec.radio.amateur.equipment:24869 rec.radio.amateur.policy:33073 rec.radio.scanner:45431 rec.radio.shortwave:70000


INTRODUCING HAM RADIO ONLINE INTERACTIVE!
Now you can post free classified ads, DX openings, VHF band openings
and much more. And with over 10,000 readers stopping by last month,
your thoughts will actually get read at this ham radio web site! We are not
just pointers to cyberspace - we've got actual content - feature articles,
newsletters, product reviews, real-time propagation conditions and more.

The February 1996 edition of Ham Radio Online International Magazine
is available at http://www.accessone.com/~vbook/hronline.htm

Some of the NEW February stories include a review of SkyTel's "2-way paging" s
ystem,
radio surveillance frequencies, and the effects of two-way radio operation in
blasting
zones.

Ham Radio Online has been selected as a featured web site by America Online
and a Top 100 web site for the month of January by Planet Earth, Inc.
New articles are available now and we add articles throughout the month.

Ham Radio Online has up-to-date news about Amateur Radio from around the world
,
feature stories, real-time propagation and auroral condition reports, real-tim
e
earthquake and severe weather conditions for emergency communications planning
,
online humor section and the Ham Radio Online Library with fully indexed (find
any section with just a mouse click) Part 97 rules and regulations.

Plus we cover broadcasting, shortwave, scanning generally anything having to
do with radio telecommunications.

And we plan to offer some totally cool new services during the coming months.
As
always its free and free of ads.

Thanks to you, we had over 10,000 readers stop by during January!

Please enjoy!

73, Ed Mitchell
KF7VY
[e-mail]
http://www.accessone.com/~vbook/hronline.htm

------------------------
personal email to [e-mail]
Visit Ham Radio Online, it's free, at http://www.accessone.com/~vbook/hronline
.htm



From [e-mail] Tue Feb 13 21:00:48 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!intac!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Tom Turnbull)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help
Date: 8 Feb 96 17:23:45 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <v01510100ad3fe20ff392@[129.234.2.1]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

HELP




From [e-mail] Tue Feb 13 21:00:49 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!aimnet.com!news.exodus.net!uunet!in1.uu.net!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design
Subject: Re: Help design coil for coupling 2 amplifiers
Date: 11 Feb 1996 12:01:09 GMT
Organization: SRC
Lines: 11
Message-ID: <4fklqo$[e-mail]>
References: <4fkhdu$[e-mail]>
NNTP-Posting-Host: wa1rhp.iii.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]
Xref: news.epix.net rec.radio.amateur.homebrew:13272 sci.electronics.design:2705

If you were lucky, and the phase difference is not too bad between
amplifiers, a simple 1/4 wave line from/to each amplifier of 75 ohm
coax will function as splitter and combiners.

50 -> 1/4 wave 75 ohm coax -> 102.5 Ohms
Use a tee to join both and you're backto about 50 ohms!

Enjoy!
Tom




From [e-mail] Tue Feb 13 21:00:50 1996
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design
Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!imci4!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Help design coil for coupling 2 amplifiers
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4fkhdu$[e-mail]>
Date: Mon, 12 Feb 1996 00:30:37 GMT
Lines: 33
Xref: news.epix.net rec.radio.amateur.homebrew:13305 sci.electronics.design:2775

In article <4fkhdu$[e-mail]> [e-mail] writes:
>I would like to add the power of two identical amplifiers in 80-120MHz
>range with 300W each.
>
>I don't know how.
>
>I believe that you have to apply signal to each amplifier (invert one
>signal like LF amplifier ?) adapting impedance (50 ohms -> 50 + 50
>ohms). For output add power with impedance matching.

What you need is called a Wilkinson power splitter/combiner. This
will divide the drive power equally between the amplifiers, and
combine their output powers. Phase is maintained identical through
both paths, except for the differences in phase internal to the two
amplifiers. That can be compensated by using an adjustable phase
shifting network at the input of one of the amplifiers, IE a line
stretcher or the like, and adjusting to null reject power. You
may also need to be able to control the gain of one of the amplifiers
so that you can exactly match amplitude response too, again adjusting
to null reject power.

Wilkinson networks are easy to build for a specific frequency. In
your range they would just be lengths of coax and a reject load
resistor. To cover the entire 80-120 MHz spread without retuning
would be more difficult. See any RF handbook for details of building
Wilkinson splitters and combiners.

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


From [e-mail] Tue Feb 13 21:00:51 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: NAME: <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: ICOM IC-2SAT HELP!?
Date: 12 Feb 1996 02:16:28 GMT
Organization: ORG:
Lines: 18
Message-ID: <4fm7ts$no7$[e-mail]>
Xref: news.epix.net rec.radio.amateur.equipment:24867 rec.radio.amateur.homebrew:13292 uk.radio.amateur:10833

I have just bought an ICOM IC-2SAT minus instuction manual.
can anyone help me with the following points:-

1) does this radio have a tone burst for reapeter use ,if so how
is it operated?

2) my radio seems to have rx 100-200 Mhz and tx 140-150Mhz
but the disply will read 0-1300 Mhz. does this mean it can
be made to receive from 0-1300 Mhz if so how?

3)does anyone know of any other mods or add-on modules for the
2-sat ?

 i would be greatful of any help or details on this radio..

THANX

  ROB!!!!!


From [e-mail] Tue Feb 13 21:00:52 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!warwick!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!microvst.demon.co.uk
From: "Anthony R. Gold" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: ICOM IC-2SAT HELP!?
Date: Mon, 12 Feb 96 13:58:26 GMT
Organization: Microvest Limited, London
Lines: 25
Message-ID: <[e-mail]>
References: <4fm7ts$no7$[e-mail]> <4fncpo$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: microvst.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.30
X-Mail2News-Path: microvst.demon.co.uk
Xref: news.epix.net rec.radio.amateur.equipment:24868 rec.radio.amateur.homebrew:13293 uk.radio.amateur:10838

In article <4fncpo$[e-mail]>
           [e-mail] "Philip Manning" writes:

> To Rob, You had better alter your Compuserve address, otherwise mail will
> bounce, bring your address CompuServe.COM down to lower case, otherwise you
> might not get any mail at all, if somebody copies it verbatim.
>
> Best to address it Internet:[e-mail]

I think that Rob has it right. Internet email host names are case
insensitive. (But user names may not be.) Compuserve's mail system will
definitely not bounce this and your host system should get the correct
address from the dns with this name, if it isn't broken.  Judging from the
six copies of the posting you sent, I wouldn't bet on that.

BTW, the format of `Best address' which you suggest is perfect for sending
email from one CompuServe user to another Comuserve address but via
Compuserve's Internet gateway, which is a fairly unusual thing to do.

Regards,
--
   Tony - G3SKR / AA2PM                  email: [e-mail]
                                                [e-mail]
                                        packet: g3skr@n0ary.#nocal.ca.usa.na


From [e-mail] Tue Feb 13 21:00:53 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet
From: Philip Manning <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: ICOM IC-2SAT HELP!?
Date: 12 Feb 1996 12:47:42 GMT
Organization: University of Surrey, Guildford, England
Lines: 11
Message-ID: <4fncte$[e-mail]>
References: <4fm7ts$no7$[e-mail]>
NNTP-Posting-Host: olympus.ee.surrey.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m)
To: [e-mail]
X-URL: news:4fm7ts$no7$[e-mail]
Xref: news.epix.net rec.radio.amateur.equipment:24873 rec.radio.amateur.homebrew:13298 uk.radio.amateur:10846

To Rob, You had better alter your Compuserve address, otherwise mail will
bounce, bring your address CompuServe.COM down to lower case, otherwise you
might not get any mail at all, if somebody copies it verbatim.

Best to address it Internet:[e-mail]

Phil G1LKJ

Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very
similar.



From [e-mail] Tue Feb 13 21:00:54 1996
Path: news.epix.net!news.sprintlink.net!fish.pond.com!kd3bj!jolt.pagesat.net!netserv.com!aimnet.com!news.exodus.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (N1MM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood 241
Date: 10 Feb 1996 12:22:51 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 22
Sender: [e-mail]
Message-ID: <4fik9b$[e-mail]>
References: <4fh3t1$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4fh3t1$[e-mail]>, Thomas Martin
<[e-mail]> writes:

>Does anyone know what causes the infamous problem with the 241
>display going haywire? It has to be documented somewhere. I
>know 4 people with the same problem in my area but noone knows
>how to fix it.
>
>

If the author above is referring to a Kenwood TM-241, then I have the same
problem, and would love to see an answer to his query.  Sometimes the
display looks fine...  Right now, all of the horizontal segments are on,
and a few of the vertical ones.  It is *really* annoying, but I don't want
to give up usage of my packet radio to get it fixed.  It seems to have no
affect on operation, just the display.

Thanks.

Tom - N1MM

Tom - N1MM


From [e-mail] Tue Feb 13 21:00:54 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!jazz!butch
From: [e-mail] (' ALLAN W. BART)
Subject: Looking For Good Transformer
Message-ID: <[e-mail]>
Organization: Maestro Technologies, Inc.
X-Newsreader: TIN [version 1.2 PL0]
Date: Sun, 11 Feb 1996 14:25:46 GMT
Lines: 9

Hello,

I have talked about building a linear for years and I have collected all
of the parts,however, the transformer that I have is no match in quality
for the 120mf oil capacitor, and I would also like a high quality
bandswitch- 7 or more positions at 10kv would be nice. So tell me what
you have, btw I am located in New York City.

allan


From [e-mail] Tue Feb 13 21:00:55 1996
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.space,rec.radio.scanner,rec.radio.swap,rec.video.cable-tv,rec.video.satellite.dbs,rec.video.satellite.tvro
Subject: Looking for interconnection cable for HP8505, 8501 or 8750
Date: 13 Feb 1996 03:06:43 GMT
Organization: -.-. --.-     -.. -..-
Lines: 11
Message-ID: <4fov83$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news.epix.net rec.radio.amateur.equipment:24880 rec.radio.amateur.homebrew:13304 rec.radio.amateur.space:6314 rec.radio.scanner:45466 rec.radio.swap:57386 rec.video.cable-tv:19567 rec.video.satellite.dbs:23079 rec.video.satellite.tvro:23110

I am in desperate need of a couple interconnection cables for the
HP8505 network Analyzer. The cable is a D-connector with 17 pins and
7 coax cables, but only six are used. If you have any info on where I can
find some I would appreciate it.

Thanks
AC4OP
Pieter
[e-mail]
http://www.mindspring.com/~wave



From [e-mail] Tue Feb 13 21:00:56 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!night.primate.wisc.edu!nntp.msstate.edu!gatech!newsxfer2.itd.umich.edu!chi-news.cic.net!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!news.usafa.af.mil!usenet
From: [e-mail] (Tired of the question...)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MFJ QRP SSB Rigs - Worth the $$?
Date: Fri, 09 Feb 1996 20:50:49 GMT
Organization: United States Air Force Academy
Lines: 25
Message-ID: <4fgcbt$[e-mail]>
References: <49voub$[e-mail]> <4a59nc$[e-mail]>
NNTP-Posting-Host: dfl52.usafa.af.mil
X-Newsreader: Forte Free Agent 1.0.82


Greetings!

Thanks for all of your E-Mails and posted responses.

Just got a winning suggestion, well, a couple of 'em, actually,  that
make fundamental sense to me...

I think I'll put a second battery in my 4x4 and use my favorite Atlas
210x when 'wheeling and "car camping"...

and I'll go for a kit like the NorCal 20m/75m SSB QRP rig for
backpacking.

Great!  Thanks again for all of your inputs and recommendations!

-- Dave

P.S.  BTW, I got nothing but praise for the MFJ SSB rigs, even though
it looks like I'll probably not go that route.







From [e-mail] Tue Feb 13 21:00:57 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!drm6!drm6
From: [e-mail] (Drew R. McGhee)
Newsgroups: rec.radio.amateur.homebrew
Subject: Multiplexing was Re: Stereo xmitter chip?
Date: Mon, 12 Feb 1996 20:38:01 GMT
Organization: CAC
Lines: 18
Message-ID: <[e-mail]>
References: <4emtge$[e-mail]> <[e-mail]> <4fglva$[e-mail]>
NNTP-Posting-Host: zag.aa.psu.edu
X-Authinfo-User: [e-mail]
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

Other stuff deleted

>I don't know if multiplex transmitting is
>legal on the ham bands.

>                        --David
>--
>David Kazdan, M.D., Ph.D      [e-mail]; Amateur Radio: AD8Y


Greetings to David and the group,

I believe ATV qualifies as a multiplexed signal. So yes, multiplexed signals
are permitted on the ham bands.

Drew R. McGhee, KA3EJV
Altoona, PA



From [e-mail] Tue Feb 13 21:00:58 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RICKCRIDER)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need ID: Motorola final/ MRF327-8851
Date: 11 Feb 1996 04:18:04 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <4fkc8c$[e-mail]>
Reply-To: [e-mail] (RICKCRIDER)
NNTP-Posting-Host: newsbf02.mail.aol.com

Peering inside of an amplifier that I aquired at a military surplus store,
trying to figure out what band it is for and what the power output is.
It takes a 28v DC power supply.  Has 'N' type connectors for in and out.
Made by 'TPL Com Inc.
Inside there are five identical circuit boards tied together, with the
heart of each board appearing to be Motorola brand finals.   White ceramic
looking discs, about 1/2" in diameter and 1/8" thick.   On them is the
Motorola logo and the following:
MRF327 (on the top line) and 8851 directly under the top line.   Any
techies out there know what frequencies these may operate at, and at what
power output?
I really have no idea what I have here.   It is modern, and brand new.
Just don't know how to figure out what it was made for.


From [e-mail] Tue Feb 13 21:00:59 1996
Path: news.epix.net!news.sprintlink.net!news.icon.net!imci2!news.internetMCI.com!imci4!newsfeed.internetmci.com!in1.uu.net!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need ID: Motorola final/ MRF327-8851
Date: 11 Feb 1996 11:56:37 GMT
Organization: SRC
Lines: 9
Message-ID: <4fkli8$[e-mail]>
References: <4fkc8c$[e-mail]>
NNTP-Posting-Host: wa1rhp.iii.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

MRF327 information is available from the Motorola web site.

MRF327 80Watts 100-500 Mhz.

Enjoy
Tom
WA1RHP




From [e-mail] Tue Feb 13 21:01:00 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!classic.iinet.com.au!yarrina.connect.com.au!news.mira.net.au!Germany.EU.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (SteveBragg)
Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components
Subject: Re: Need VCO, 1-2 gHz - circuit or off-shelf
Date: 7 Feb 1996 11:38:18 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <4fakhq$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (SteveBragg)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: news.epix.net aus.electronics:1742 aus.radio.amateur.misc:425 rec.radio.amateur.homebrew:13280 sci.electronics.components:2140

Steve,

Z-Communications in USA will sell you a single piece part.  I
personally have built a 1296-MHz synthesizer around their
VCO, and they are quite linear and predictable.   Z-COMM has VCO's to at
least 2.4 GHz, and they are in the US$10 to US$25 price range (13.40 to
33.50 Aussie $, 1992 exchange; sorry, it's the most current rate I have).
 Write or call them at:

Z-Communications
9939 Via Pasar
San Diego, CA 92126 USA
USA TEL [phone]

Best of luck, and let me know how it comes out.

Steve Bragg, KA9MVA
Stillwater, Oklahoma, USA
E-Mail:  [e-mail]   or    [e-mail]
Web Page:  http://members.aol.com/SteveBragg/private/ka9mva
USA Tel:  [phone]


From [e-mail] Tue Feb 13 21:01:01 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.tc.cornell.edu!news.cac.psu.edu!news.math.psu.edu!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: noise source
Date: 12 Feb 1996 14:05:56 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 7
Distribution: world
Message-ID: <4fnhg4$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

>There was a thread running a couple of weeks back on construction of a
>diode noise source that was described in QST.

That article is "A Calibrated Noise Source for Amateur Radio" by
W.E. Sabin, in the May 1994 QST. This article is also found in the
ARRL Handbook, 1995/1996 editions.



From [e-mail] Tue Feb 13 21:01:02 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 10 Feb 1996 22:24:15 GMT
Lines: 14
Message-ID: <4fj5uf$[e-mail]>
References: <willmore.823905417@whelk>
NNTP-Posting-Host: node094.axiom.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

I'm not a PLL expert but have worked with some simple stuff at
1Khz.  I believe the design of the filter will affect the capture
and lock range of the PLL.  For example, too sharp a filter could
easily lose lock (If I understand it right).  However I think the
gear shifting filter idea might work just dandy.  Although
depending on your application, there usually isn't much need for a
really whopper filter in the PLL.

Just my thoughts

73s
de KI5XW




From [e-mail] Tue Feb 13 21:01:03 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!cmchub.rns.com!news.silcom.com!news.west.net!coconut!news.enteract.com!delta.misha.net!news
From: [e-mail] (M Simon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: Sun, 11 Feb 1996 21:31:40 GMT
Organization: Space-Time Productions
Lines: 44
Message-ID: <4fln1c$[e-mail]>
References: <willmore.823905417@whelk>
NNTP-Posting-Host: 206.230.95.11
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (David A Willmore) wrote:

>It seems that every time I look for information on PLL loop filter design,
>they focus on simple implementation of the loop filter.  Is it because
>simple one or two pole filters are the ideal filters for this use or
>is there some other design constraint involved?  The filter only has to
>work in the audio range--from my understanding.  Would a brick wall, low
>pass filter of a high order be a better solution?  What if you could widen
>the passband while tuning and narrow it down once you have aquired lock?

>Maxim has some nice eighth order switched capacitor filters which could
>easily fill this role.  They are clocked at 100 times the highest passed
>frequency and are available in the three classic filter topoligies.  It
>would be easy to put in a 1MHz clock with a 10x prescaler for a wide
>passband and then increase the prescaler value (eight bit counter) when
>the PLL has locked.  Would this do what I think and decrease phase noise?

>Just a few thoughts and questions.  BTW, anyone have a good VCO design for
>60.7 to 64.7 MHz? :)

>Cheers,
>David N0YMV

>Disclaimer:  I don't speak for Motorola.

You should talk with some Mot. engineers in Illinois they could
provide you with good info.

The problem with the Maxim filters is noise.

High order filters are more prone to ringing which increases
settling times.

Mot. has some good books on PLL's get them.

Changing the loop BW is sometimes done if needed. Adds
complication.

Simon
M. Simon is a         Master in   The Ascended Bastard
                                     School of Yoga
 [e-mail]
                              Our Aim is Money and Power



From [e-mail] Tue Feb 13 21:01:04 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!lamarck.sura.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!usc!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 10 Feb 1996 19:08:01 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 19
Message-ID: <4fiqeh$[e-mail]>
References: <willmore.823905417@whelk>
NNTP-Posting-Host: hplsnb.lsid.hp.com

David A Willmore ([e-mail]) wrote:
: It seems that every time I look for information on PLL loop filter design,
: they focus on simple implementation of the loop filter.  Is it because
: simple one or two pole filters are the ideal filters for this use or
: is there some other design constraint involved?  The filter only has to
: work in the audio range--from my understanding.  Would a brick wall, low
: pass filter of a high order be a better solution?  What if you could widen
: the passband while tuning and narrow it down once you have aquired lock?

The problem is that the filter is part of a closed-loop feedback control
system.  If you have unity gain and net 360 degrees phase shift in the
loop, you are going to have oscillations.  Since high-order filters have
large phase shifts where their gain is still high, they aren't appropriate
for use in a closed loop.

--
Cheers,
Tom
[e-mail]


From [e-mail] Tue Feb 13 21:01:05 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!saga.demon.co.uk!Steve
From: Steve W <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Power Supply schematic wanted
Date: Sun, 11 Feb 1996 21:02:32 +0000
Organization: Widdy
Lines: 14
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: saga.demon.co.uk
X-NNTP-Posting-Host: saga.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.10 <RuaZWvhmDJHKvdesDaHUurUnJr>

Hi all,

Could anyone out there help me out with a schematic diagram to build a
13.8v 15-20A power supply, regulated and stabilised ?

Thanks in advance

Steve G7ULW
[e-mail]


--
Steve W


From [e-mail] Tue Feb 13 21:01:06 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: Fri, 09 Feb 96 03:23:15 GMT
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]> <rohrwerk-0502961808280001@10.0.2.15>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I've just come across an IC in an old National data book that looks
like a good candidate for building a stable VFO or PTO.  It's the
LM175 (derated versions are 275/375).  This is an oscillator/buffer
combination and the specifications regarding stability are pretty
impressive:

    Parameter               Conditions          Typical

Power Supply Rejection    5V < Vcc < 10V       0.1 ppm / V
Temperature Rejection    -55C < Ta < +125C     0.05 ppm / Deg. C
     Load Pull          short <= RL <= open    0.01 ppm

Seems to me it would be much easier to compensate an oscillator
built around this IC, because the chip would eliminate many of
the potential variables and problem areas of a discrete design.

Does anyone know if this IC is still available, and does anyone
here have any experience using it?

Tnx & 73,
Jack  WB3U


From [e-mail] Tue Feb 13 21:01:07 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PTO Temperature Compensation
Date: Fri, 09 Feb 96 03:28:17 GMT
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <4fb86a$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I've just come across an IC in an old National data book that looks
like a good candidate for building a stable VFO or PTO.  It's the
LM175 (derated versions are 275/375).  This is an oscillator/buffer
combination and the specifications regarding stability are pretty
impressive:

    Parameter               Conditions          Typical

Power Supply Rejection    5V < Vcc < 10V       0.1 ppm / V
Temperature Rejection    -55C < Ta < +125C     0.05 ppm / Deg. C
     Load Pull          short <= RL <= open    0.01 ppm

Seems to me it would be much easier to compensate an oscillator
built around this IC, because the chip would eliminate many of
the potential variables and problem areas of a discrete design.

Does anyone know if this IC is still available, and does anyone
here have any experience using it?

Tnx & 73,
Jack  WB3U


From [e-mail] Tue Feb 13 21:01:10 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!djwhome.demon.co.uk
From: David Woolley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP Schematics scanned and ready!
Date: Sun, 11 Feb 1996 10:37:35 GMT
Organization: Demon Subscriber at Home
Lines: 15
Message-ID: <[e-mail]>
References: <4f0sru$[e-mail]> <[e-mail]>
X-NNTP-Posting-Host: djwhome.demon.co.uk
X-Mail2News-Path: djwhome.demon.co.uk

In article <[e-mail]>,  <[e-mail]> wrote:
>
>I think here is as good a place as any to post them.  Personally I would
>prefer JPEG's.  I would start with one and see what kind of response you get.

>They should be uuencoded first.

Do not post them here.  This is not a binaries group and news admins don't
like hidden binaries groups; they are even more likely to block them than
overt binaries groups.

JPEG is not a good format for line drawings.  TIFF FAX, PCX and GIF are
all better at handling them (JPEG is very good for natural images, though).
--
David Woolley, London, England          [e-mail]


From [e-mail] Tue Feb 13 21:01:11 1996
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!hp.fciencias.unam.mx!uaem!op.net!agis!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!in1.uu.net!interaccess!d105.nb.interaccess.com!user
From: [e-mail] (Dave Moorman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP Schematics scanned and ready!
Date: Mon, 12 Feb 1996 18:44:31 -0600
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 25
Message-ID: <[e-mail]>
References: <4f0sru$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: d187.nb.interaccess.com

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

> In article <[e-mail]>,  <[e-mail]> wrote:
> >
> >I think here is as good a place as any to post them.  Personally I would
> >prefer JPEG's.  I would start with one and see what kind of response
you get.
> >They should be uuencoded first.
>
> Do not post them here.  This is not a binaries group and news admins don't
> like hidden binaries groups; they are even more likely to block them than
> overt binaries groups.

Amen!

They are likely to be cancelled by admins.

Post them to alt.binaries.pictures.misc.  and post a message here saying
they are there.  Then we'll know where to go to get them.

Dave Moorman, K9SW
Downers Grove,
Illinois,
USA


From [e-mail] Tue Feb 13 21:01:12 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!egsner!convex!newshost.convex.com!news.dfw.net!imci4!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!amber1.ultranet.com!user
From: [e-mail] (Jon Goguen)
Newsgroups: rec.radio.amateur.homebrew
Subject: QST Noise Source Article?
Date: 12 Feb 1996 01:40:29 GMT
Organization: UltraNet Communications, Inc.
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: amber1.ultranet.com
X-Newsreader: Value-Added NewsWatcher 2.0b22.0+

There was a thread running a couple of weeks back on construction of a
diode noise source that was described in QST a couple of years ago.
Anyone have the exact reference so I can order the acticle via
inter-library loan?

Thanks,

Jon


From [e-mail] Tue Feb 13 21:01:13 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!nntp.coast.net!news.net99.net!news.cyberg8t.com!host15.cyberg8t.com!user
From: [e-mail] (John)
Newsgroups: rec.radio.amateur.homebrew
Subject: Repair: Memorex 4010 TV
Date: 7 Feb 1996 20:58:55 GMT
Organization: Cyberg8t Internet Services (800) 399-4NET
Lines: 41
Message-ID: <[e-mail]>
NNTP-Posting-Host: host15.cyberg8t.com

I have a Memorex TM-4010(made for Tandy) Screen TV(for ATV) that has
recently lost it picture and Sound.

I checked fuses on the power supply and one near  the Flyback transformer.
I feed video and audio from a VCR to the "F" connector on the back.
Nothing. I then tried feeding audio and video from the RCA jack on the VCR
to the RCA jacks on the TV. I then get audio but no video.

My first guess is the tuner has died. Is there anything else I should try
before buying a tuner?

Where is a good source for TV tuners?





73 de John KN6LH        (714)-324-6320

------------------------------------------------------
|       AX25: KN6LH@K6VE.#SOCAL.CA.NA.USA            |
|       tcp/ip: [e-mail]                 |
|       Internet: [e-mail]                   |
|                [e-mail]                   |
|          URL: http://www.anawave.com/~kn6lh        |
|        Snail Mail: John Fay                        |
|                    P.O. Box 1271                   |
|                    Claremont CA 91711              |
|                                                    |
------------------------------------------------------

--
73 de John KN6LH

------------------------------------------------------
|        AX25: KN6LH@K6VE..#SOCAL.CA.NA.USA          |
|        tcp/ip: [e-mail]                |
|        Internet: [e-mail] or               |
|                 [e-mail]                  |
|        http://www.anawave.com/~kn6lh               |
------------------------------------------------------


From [e-mail] Tue Feb 13 21:01:14 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!khis_news.khis.kodak.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Repair: Memorex 4010 TV
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Fri, 9 Feb 1996 08:53:23 GMT
Lines: 37

In article <[e-mail]> [e-mail] (John)
 writes:
>I have a Memorex TM-4010(made for Tandy) Screen TV(for ATV) that has
>recently lost it picture and Sound.
>
>I checked fuses on the power supply and one near  the Flyback transformer.
>I feed video and audio from a VCR to the "F" connector on the back.
>Nothing. I then tried feeding audio and video from the RCA jack on the VCR
>to the RCA jacks on the TV. I then get audio but no video.
>[
>My first guess is the tuner has died. Is there anything else I should try
>before buying a tuner?

You might try feeding *RF* to the tuner. That's what the F connector
is for, RF not video. But that's probably what you meant to say anyway.
Now you've got audio, so you know the TV is getting power. You don't
have video when you feed video to the set (I'm assuming here that
you're *really* feeding video to the set, and not just RF to the
wrong port). Now the direct video input is *after* the tuner, since
video is the *demodulated* RF from a TV transmission, so whether the
tuner is bad or not is irrelevant, you've got video display problems.

Do you have a raster? To check that, turn the brightness all the way up,
the screen should turn grey. If it doesn't, you may have a high voltage
problem, or an open filament in the CRT. If you do have a raster, then
you've got video amplifier problems. (This could be as simple as a *switch*
set incorrectly to tuner when you are feeding direct video, or vice versa,
or it could be an actual video amplifier problem.)

In any event, forget the tuner for now, get the video display to
work first, then we'll see if there's a tuner problem.

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


From [e-mail] Tue Feb 13 21:01:15 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!intac!newsstand.cit.cornell.edu!ub!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Thinker335)
Newsgroups: rec.radio.amateur.homebrew
Subject: RF remote control link to toy.
Date: 10 Feb 1996 18:12:31 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <4fj8ov$[e-mail]>
Reply-To: [e-mail] (Thinker335)
NNTP-Posting-Host: newsbf02.mail.aol.com


I am interested in making a remote controlled toy robot that has a
relatively high BW ( ~ 19.2 Kbaud) full duplex (if possible) connection to
a computer base station.

I don't want to violate FCC regulations, and I don't want to have to get a
license. Except for the 900 - 928 MHz spread specturm band, is there any
portion of the spectrum that allows unlicensed usage of this type ?

Also, what do frequencies are used for commercially available radio
controlled toys ?

How would I find information on FCC regulations on the RF spectrum  < 1
GHz ?

Thanks in advance.


From [e-mail] Tue Feb 13 21:01:16 1996
Path: news.epix.net!uunet!in2.uu.net!inews.intel.com!usenet
From: Dave Curtis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF remote control link to toy.
Date: 13 Feb 1996 16:53:44 GMT
Organization: Intel Microcomputer Software Laboratories
Lines: 37
Message-ID: <4fqfmo$[e-mail]>
References: <4fj8ov$[e-mail]>
NNTP-Posting-Host: 143.183.124.181
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 32bit)
To: [e-mail]

[e-mail] (Thinker335) wrote:
>
>I am interested in making a remote controlled toy robot that has a
>relatively high BW ( ~ 19.2 Kbaud) full duplex (if possible) connection to
>a computer base station.
>
>I don't want to violate FCC regulations, and I don't want to have to get a
>license. Except for the 900 - 928 MHz spread specturm band, is there any
>portion of the spectrum that allows unlicensed usage of this type ?

Perhaps the ISM (Industrial/Scientific/Medical) band(s) -- there is one
around 2.3GHz, shared with a ham band.

>
>Also, what do frequencies are used for commercially available radio
>controlled toys ?

I know of three bands, to my knowledge limited to one of 2 modulation schemes.
One sold as "FM", where PPM servo control data is FM modulated, and "PCM" wher
e
digital servo control data is sent as a digital code.  "AM" has been phased ou
t.
There are some channels in the 27 MHz CB band -- good luck here.  R/C flyers a
bandoned
this band a long time ago due to encroachment from illegal CB voice communicat
ions.
(There, I said that as nicely as I could.)
There are some frequencies allocated for R/C in the 50 MHz ham band, you need
a
Technician class ham license here.  And then there is a band at 72 MHz, betwee
n
TV channels 4 & 5.  Also, there are toys with low power transmitters operating
under part 15 rules at 49 MHz.

>
>How would I find information on FCC regulations on the RF spectrum  < 1
>GHz ?
>
>Thanks in advance.

-Dave NG0X




From [e-mail] Tue Feb 13 21:01:17 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB220 HELP NEEDED
Date: 9 Feb 1996 11:52:42 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 25
Sender: [e-mail]
Message-ID: <4ffu4q$[e-mail]>
References: <4fb50u$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

>I have a Heathkit SB 220 amp that has a problem with the high voltage
>power supply. Every time I key down, the high voltage drops considerbly.
>I have heard that the HV supply leaves a lot to be desired and that the
>tubes in the amp are not running at their real potential. Does anyone
>have any info on how to improve the HV supply in this amp?

I did a few PA designs for Heath. Let me say this. The SB-220 was designed
to run 1 KW INPUT, or 600 watts out on carrier, and 2 KW PEP SSB input, or
~1200 watts PEP (no more than 600 watts average) out on SSB. The cooling,
transformer, and other things are perfectly selected if you follow the
manual. If you try to run the full capability of the 3-500's, the entire
amp needs re-designed.

>I suspect that the caps may be old. Does this sound like it could be
>the problem?

Not if the amp's RF output isn't "humming" excessively on a single tone
carrier (CW keydown) test. How much is it dropping? It could be normal.
That isn't the stiffest supply in the world. And what type of house wiring
are you using?

73 Tom
>Any help would be welcomed.
>
>Thank you.......KC6HVI


From [e-mail] Tue Feb 13 21:01:19 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!news.sol.net!daily-planet.execpc.com!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!shore!news3.near.net!transfer.stratus.com!usenet
From: Scott Adams <scotta>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics going to a web page
Date: 9 Feb 1996 23:44:10 GMT
Organization: Stratus Computer Inc, Marlboro MA
Lines: 23
Message-ID: <4fgm8a$[e-mail]>
References: <4faim2$7ll$[e-mail]>
NNTP-Posting-Host: coyoacan.sw.stratus.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1 (X11; U; SunOS 4.1.3_U1 sun4c)
X-URL: news:4faim2$7ll$[e-mail]

Jay WB0VNE wrote:

> was a draftsman and the engineer was not involved in that stage.  A better
> approach is to use some electronic format that includes the parts, connectio
ns
> and can create a netlist.  One other desired feature is ASCII format so we
> can send it back and forth without UUEncoding etc.  My (highly Jaded) view
> is to use CIRCAD.  It meets all of the above and the program also works with
> OrCAD, Tango, Protel, ACAD and other files.  The demo is free so everyone
> can view files.  The demo also lets you write (aprox 32K) files so we can
> all exchange small files cheaply.  So, thats my 2 cents worth.  Thanks for
> the new WEB Site!

I'm looking around for a modestly-priced, PC-compatible (ie: MSWin 3.1 or
MSDOS) schematic pkg, preferably with compatible PC-board layout (decent
auto-router would be nice).  I've not heard of CIRCAD; would this qualify as
modestly-priced (ie: hobby - I don't consider any of those you mentioned to fi
t
this catagory)?  Any suggestions for such a beast?

Suggestions appreciated (of the non-flame type)...

Scott Adams
[e-mail]



From [e-mail] Tue Feb 13 21:01:20 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!news.mindspring.com!uunet!in1.uu.net!alterdial.uu.net!not-for-mail
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics going to a web page
Date: 11 Feb 1996 16:52:44 GMT
Lines: 15
Message-ID: <4fl6ss$[e-mail]>
References: <4faim2$7ll$[e-mail]> <4fgm8a$[e-mail]>
NNTP-Posting-Host: node094.axiom.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Have you heard of "PADS"?  It is a circuit schematic editor, and
PCB layout program.  I believe it comes in a Sharware or lite
version.  I had a copy but played with it very little.  It does do
the job though - definately not as well as a high dollar program,
but it does work.  I did have some problems getting it to run
properly, but my system was lacking memory and running on a 386
chip.  I don't know how you can find it, but it should be out
there somewhere.  It is definately worth trying out if you can get
a copy.  Some neat features are the ability to interface with
SPICE and has several export/import formats for both schematics
and PCB layout.

73s KI5XW
Dave



From [e-mail] Tue Feb 13 21:01:21 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!news.mindspring.com!uunet!in1.uu.net!alterdial.uu.net!not-for-mail
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics going to a web page
Date: 11 Feb 1996 16:52:13 GMT
Lines: 15
Message-ID: <4fl6rt$[e-mail]>
References: <4faim2$7ll$[e-mail]> <4fgm8a$[e-mail]>
NNTP-Posting-Host: node094.axiom.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: scotta

Have you heard of "PADS"?  It is a circuit schematic editor, and
PCB layout program.  I believe it comes in a Sharware or lite
version.  I had a copy but played with it very little.  It does do
the job though - definately not as well as a high dollar program,
but it does work.  I did have some problems getting it to run
properly, but my system was lacking memory and running on a 386
chip.  I don't know how you can find it, but it should be out
there somewhere.  It is definately worth trying out if you can get
a copy.  Some neat features are the ability to interface with
SPICE and has several export/import formats for both schematics
and PCB layout.

73s KI5XW
Dave



From [e-mail] Tue Feb 13 21:01:22 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!news.sol.net!uniserve!van-bc!news.cyberstore.ca!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Screwdriver Ant. Plans Wanted
Date: 10 Feb 1996 00:03:01 GMT
Lines: 6
Message-ID: <4fgnbl$[e-mail]>
NNTP-Posting-Host: node094.axiom.net
Mime-Version: 1.0
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Xref: news.epix.net rec.radio.amateur.homebrew:13270 rec.radio.amateur.antenna:19005

Does anyone know of a resource for building a screwdriver antenna?
Perhaps a net resource, magazine article etc.

Thanks and 73s
de KI5XW



From [e-mail] Tue Feb 13 21:01:22 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!uunet!in2.uu.net!news.iadfw.net!usenet
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: software for mfj-1278 tnc
Date: Sun, 11 Feb 1996 05:51:37 GMT
Organization: customer of Internet America
Lines: 18
Message-ID: <4fk06d$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dal14-15.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Peter L. Williamson) wrote:

>Hello all,
>           I amlooking for some software to use all the functions of the mfj
>1278 multimode tnc.  I am sure I saw somewhere a program described that does
>all the functions (but much better ) than multicom 3.1.  Unfortunately I did
>not bookmark the site or program name, can you help????.
>regards Peter L. Williamson VK4AWP.
I'm using multicom, but I have a friend using a program from Canada
called "Skyrider".  I don't think it supports fax and maybe other
video modes though.  He said that he saw it in an ad in a magazine.
Sorry but that's all I remember about it.
73,
Kerry
[e-mail]





From [e-mail] Tue Feb 13 21:01:24 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!hookup!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Switching Power Supplies
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4fgk2v$[e-mail]>
Date: Sat, 10 Feb 1996 01:54:37 GMT
Lines: 45

In article <4fgk2v$[e-mail]> [e-mail] writes:
>Folks,
>
>Should a switching power supply be used to supply power to
>radio equipment?   Does it introduce problems I want to avoid?
>(This question comes up because I have ready access to some
>200 watt power supplies that have been "pulled" from PCs...)

Switchers *can* work fine for powering amateur equipment, witness
the Icom and Yaesu switching supplies. *However*, the switcher
used must be designed to work with the radio in several respects.

First, it must maintain regulation across the wide current load
demands from a few milliamps to 20 amps that a radio may present.
Many switching supplies require a *minimum* load or they lose
regulation (often disasterously by going to a very high voltage).

Second, it must adequately suppress switching hash. Switchers
are inherently generators of high harmonic content. This has
to be suppressed or you'll pickup the hash in the radio.

Third, the power supply must be tolerant of a high RF environment.
Switchers are often sensitive to stray RF, which can cause them
to lose regulation (sometimes with disasterous consequences).

Now the PC power supply presents special problems in this regard.
It requires a minimum load on the 5 volt bus to function. So if
you're going to use it to power 12 volt equipment, you're going
to have to put a "dummy load" on the 5 volt bus to make it work
correctly. Most PC switchers require at least a 2 amp draw on the
5 volt bus to function correctly. And of course the PC supply can
only source 2 amps on the 12 volt line, so it is *really* only a
24 watt 12 volt supply. Most of that 200 watt rating is on the 5
volt bus where it normally supplies *large* amounts of current.

I'd just strip them for parts. There are some good parts inside
there, including some nice capacitors you could use in the power
supply of your tube amplifier projects.

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


From [e-mail] Tue Feb 13 21:01:25 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!uunet!in2.uu.net!alterdial.uu.net!not-for-mail
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Switching Power Supplies
Date: 10 Feb 1996 22:20:50 GMT
Lines: 12
Message-ID: <4fj5o2$[e-mail]>
References: <4fgk2v$[e-mail]>
NNTP-Posting-Host: node094.axiom.net
Mime-Version: 1.0
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To: [e-mail]

It all depends on what you want to run with your power supply.
Switchers do introduce some noise, but most are well filtered and
out of the audio and amateur bands.  The hard part is finding a
switcher that can handle the load.  For example, a 200 watter is
15 amps approx, barely enough for a solid state HF rig.  Also note
that your 200 watt supply is more than likely only rated for an
amp or two at 12 volts.  Usually all the ooommmpph is in the 5
volt supply.

-dnult
KI5XW



From [e-mail] Tue Feb 13 21:01:26 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!imci4!newsfeed.internetmci.com!news.smart.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: tech info
Date: Sun, 11 Feb 96 05:29:54 PDT
Organization: Smartnet Internet Services [via news]
Lines: 26
Message-ID: <[e-mail]>
NNTP-Posting-Host: ttttt.smart.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


I have some questionable chips used in a keyboar
in an electric typewriter and I'm going to try to
get them locally if possible.

If someone has a couple of minutes, could you please
post substitution numbers on these chips.
Fairchild or TI numbers should be be fine.

Chip #1:
Mostek 8509
MK23128
MK 23032N-25

Chip #2:
NEC 8430x8

Chip #3:
AMD
8349MPA
P8031

Thanks for the help

email; [e-mail]



From [e-mail] Tue Feb 13 21:01:27 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!tank.news.pipex.net!pipex!demon!ifwtech.demon.co.uk!G3SEK
From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Use for ferite materials???
Date: Mon, 12 Feb 1996 22:10:21 +0000
Organization: IFW Technical Services
Lines: 28
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
X-NNTP-Posting-Host: ifwtech.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL>

In article <[e-mail]>, Steven B Reed wrote:
>Hello all,
>       I work at a large CRT manufacturer, and they throw away a large
>quanity of defection yokes.  I have saved a few from the landfill,
>(mostly for the enameled copper wire), and have discovered what appears
>to be a large cone of ferite looking material.  I know that this "stuff"
>can be used to make chokes and the like.  My question is,  can these
>half cone shapes be used for anything usefull?  Now that I have them
>home I would rather do something with them besides just pitching them in
>MY trash.
>

Keep them in the original pairs! G0SNO of the RSGB EMC committee has
found that they make excellent RF chokes for heavy AC line currents,
with just the right combination of permeability and physical size.
Wind the whole line cord about 10 turns through the cone, and it'll be
resonant in the mid-HF region. You could even do the same with RG213 for
a monster feedline choke.

They don't look pretty but they do work, and scrap deflection yokes are
usually available free at the back door of the local TV repair shop.


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


From [e-mail] Tue Feb 13 21:01:28 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!ratty.wolfe.net!news.aa.net!tsunami.ixa.net!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news.service.uci.edu!ttinews!avatar!sorgatz
From: [e-mail] (Erik K.Sorgatz)
Subject: Re: VOX Circuit?
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: avatar
Organization: Citicorp TTI
References: <4f619i$[e-mail]>
Date: Thu, 8 Feb 1996 22:35:07 GMT
Lines: 18

In article <4f619i$[e-mail]> "joseph c. hawkins" <claven.den.mmc.co
m> writes:
>Any sample VOX circuits or info of where to get info would be greatly
>appreciated.
>
>Thanks
>
>

 Get hold of a copy of the ARRL Handbook for 1971...swell transistor vox
with easy-to-find parts and no headaches!

73! and dont breathe that flux smoke!


[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 Feb 13 21:01:29 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!nott!bcarh189.bnr.ca!bmerhc5e.bnr.ca!bcarh8ab.bnr.ca!bgtyi23
From: [e-mail] (Bill Kirkland)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VOX Circuit?
Date: 7 Feb 1996 14:19:51 GMT
Organization: Bell Northern Research Ltd.
Lines: 12
Message-ID: <4face7$[e-mail]>
References: <4f619i$[e-mail]> <[e-mail]>
NNTP-Posting-Host: bgtyi23.bnr.ca
X-Newsreader: News Xpress Version 1.0 Beta #4

Check the ARRL handbooks from the late 80s to possibly the early 90s.  There
is a VOX circuit in there using LM3900 current feedback op amps.  I've built
it and it works O.K.  There is an error in the schematic regarding the 555
timer that is used.  The schematic shorts out part of the 555 timer.  The
effect of this is to distroy part of the 555 timer.  However, if the short is
removed (I bent the offending pin up) the 555 timer will still do the job.
If you check the 555 timer data sheet the error in the schematic will
hopefully become obvious.


Bill Kirkland
VE3JHU


From [e-mail] Tue Feb 13 21:01:30 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Date: 3 Feb 1996 16:29:14 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <4f0k3a$[e-mail]>
References: <4er0md$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4er0md$[e-mail]>, Paul Christensen
<[e-mail]> writes:

>
>I still have an original container of "Daven Oil" for this purpose and
>use it sparingly of course.  It's got to last me a lifetime!  Anyone else

>remember using Daven Oil?
>
>-Paul, N9AZ

Hi Paul,

They made alcohol based drinks also. I have some, it's called Daven Port.

73 Tom


From [e-mail] Tue Feb 13 21:01:31 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!crl4.crl.com!not-for-mail
From: [e-mail] (Peter Gerba)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB dud 4CX5000A; 3CX10000A-15k, 20K
Date: 10 Feb 1996 07:15:49 -0800
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 7
Message-ID: <4ficr5$[e-mail]>
NNTP-Posting-Host: crl4.crl.com
X-Newsreader: TIN [version 1.2 PL2]

Hi;

I'm looking for rebuildable 4CX5,000A, 3CX10,000, 15K, 20K duds.

pete
[e-mail]



From [e-mail] Tue Feb 13 21:01:31 1996
Path: news.epix.net!uunet!in2.uu.net!cs.utexas.edu!howland.reston.ans.net!news.sprintlink.net!news1.sunbelt.net!usenet
From: [e-mail] (Jerry Flanders)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.swap,rec.radio.swap
Subject: Re: WTB HW-9 OR SIMILAR QRP RIG
Date: Tue, 13 Feb 1996 15:36:29 GMT
Organization: SunBelt.Net INTERNET Access
Lines: 12
Message-ID: <4fqb1r$[e-mail]>
References: <4fme92$[e-mail]>
NNTP-Posting-Host: ags-r1-p3.groupz.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.homebrew:13316 rec.radio.amateur.misc:98037 rec.radio.swap:57412

I am looking for a Heath HW-9 QRP rig or similar. Any condition
considered, but must have manual. Accessories OK,
but not required. Please quote exact condition, appearance,
accessories and price.

Thanks

Jerry Flanders    W4UKU   South Carolina    [e-mail]






From [e-mail] Tue Feb 13 21:01:32 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!wabbit.cc.uow.edu.au!news.une.edu.au!news.cs.su.oz.au!tmx!news.tmx.com.au!news.acay.com.au!news
From: spiro evagelakos ([e-mail])
Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap
Subject: WTB:5KW AM Transmitter
Date: 12 Feb 1996 10:19:25 GMT
Organization: ACAY Network Computing P/L, Sydney AUSTRALIA.
Lines: 4
Message-ID: <4fn47d$[e-mail]>
NNTP-Posting-Host: spiroe.acay.com.au
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)
Xref: news.epix.net aus.radio.amateur.misc:428 aus.radio.amateur.wicen:67 rec.radio.amateur.antenna:19019 rec.radio.amateur.digital.misc:14094 rec.radio.amateur.equipment:24856 rec.radio.amateur.homebrew:13283 rec.radio.amateur.misc:98001 rec.radio.scanner:45416 rec.radio.swap:57330

This time I am after a second hand 5KW  AM Transmitter

Regards
Spiro


From [e-mail] Tue Feb 13 21:01:33 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!harbinger.cc.monash.edu.au!ns.saard.net!yarrina.connect.com.au!news.mel.connect.com.au!munnari.OZ.AU!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!wabbit.cc.uow.edu.au!news.une.edu.au!news.cs.su.oz.au!tmx!news.tmx.com.au!news.acay.com.au!news
From: spiro evagelakos ([e-mail])
Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap
Subject: WTB:AMATURE TRANSMITTER @ 160MTRS
Date: 12 Feb 1996 10:15:25 GMT
Organization: ACAY Network Computing P/L, Sydney AUSTRALIA.
Lines: 5
Message-ID: <4fn3vt$[e-mail]>
NNTP-Posting-Host: spiroe.acay.com.au
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)
Xref: news.epix.net aus.radio.amateur.misc:427 aus.radio.amateur.wicen:66 rec.radio.amateur.antenna:19018 rec.radio.amateur.digital.misc:14093 rec.radio.amateur.equipment:24855 rec.radio.amateur.homebrew:13282 rec.radio.amateur.misc:98000 rec.radio.scanner:45415 rec.radio.swap:57329

Hi ,
I am after a second hand amature transmitter for the 160mtr band

Regards
Spiro


From [e-mail] Tue Feb 13 21:01:34 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!wabbit.cc.uow.edu.au!news.une.edu.au!news.cs.su.oz.au!tmx!news.tmx.com.au!news.acay.com.au!news
From: spiro evagelakos ([e-mail])
Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap
Subject: WTB:LINEAR AMPLIFIER FOR 160MTR BAND
Date: 12 Feb 1996 10:17:15 GMT
Organization: ACAY Network Computing P/L, Sydney AUSTRALIA.
Lines: 5
Message-ID: <4fn43b$[e-mail]>
NNTP-Posting-Host: spiroe.acay.com.au
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)
Xref: news.epix.net aus.radio.amateur.misc:426 aus.radio.amateur.wicen:65 rec.radio.amateur.antenna:19017 rec.radio.amateur.digital.misc:14092 rec.radio.amateur.equipment:24854 rec.radio.amateur.homebrew:13281 rec.radio.amateur.misc:97999 rec.radio.scanner:45414 rec.radio.swap:57328

Hi ,
I am after a second hand  linear Amplifier for the 160mtr band

Regards
Spiro


From [e-mail] Sat Feb 17 13:44:34 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!nntp.netrex.net!news.consultix.com!newsstand.cit.cornell.edu!ub!dsinc!netnews.upenn.edu!news
From: Jeff DePolo WN3A <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: (no subject)
Date: Wed, 14 Feb 1996 14:31:55 -0500
Organization: InterMedia Interactive Software, Inc.
Lines: 25
Message-ID: <[e-mail]>
References: <4ft621$[e-mail]>
NNTP-Posting-Host: ts11-44.upenn.edu
Mime-Version: 1.0
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X-Mailer: Mozilla 2.0b5 (Win95; I)

Gary,

Tried to send you email but your host says you don't exist.

The 1N5408 is rated for 1000V PIV, 3.0A, 125A surge, 1.0 Vf.  Digi-Key has the
m at
10 for $3.36.

I'd replace the whole string.

I don't think you'll find a beefier diode in that same package (DO-201AD).  If
 you
have enough room to work and can handle a slightly larger package, something l
ike
a Motorola MR760 which is rated for 6A might be a decent upgrade.  I don't thi
nk
I've seen diodes in small packages like you will need that have PIV's larger t
han
1000V, but they're probably out there somewhere.

I've seen a blowout as you describe because of RF-related problems elsewhere
causing a lot of radiation inside the cabinet of the amplifier.  Just a quick
blue
flash and adios power supply.  A friend of mine had the same thing happen with
 a
single 3-500 amp sold by AEA (OEM Vectronics).

                                                --- Jeff
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Jeff DePolo  WN3A            Twisted Pair: H:610-337-7383 W:215-387-3059 x300
[e-mail]  RF: 442.1 442.2 442.4 443.45 443.8 444.15 linked
Claim to Fame:  I got the 1st speeding ticket on the information superhighway


From [e-mail] Sat Feb 17 13:44:35 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!miwok!usenet
From: Gary Davidson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 14 Feb 1996 17:27:29 GMT
Organization: North Bay Network, Inc. news server - not responsible for content
Lines: 14
Message-ID: <4ft621$[e-mail]>
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I just bought an Amp Supply LK500 linear amp, running a pair of 3-500
tubes, and immediately blew a leg out of the HV rectifier stack. These
diodes are listed as 1N5408 diodes, and there are 4 diodes in each leg of
a full wave bridge. I have no idea what the ratings are on these diodes,
and would appreciate info from someone who might have a reference manual.
I amd also unaware of availability of these diodes at this point in time,
and haven't figured out whether to replace the bad string, assuming I can
locate exact replacements, or just go ahead and replace the entire string
with some diodes having higher ratings than what it originally came with.
All help and comments appreciated!

&3, Gary, KJ6Q.



From [e-mail] Sat Feb 17 13:44:36 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!nwfocus.wa.com!calvino.alaska.net!nntp.alaska.net!news.accessus.net!news.uoregon.edu!news.emf.net!gatech!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!oleane!jussieu.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: 1296 MHz VCO with comb filter
Date: 15 Feb 1996 15:22:19 GMT
Organization: ENST - Telecom Paris
Lines: 19
Message-ID: <4fvj3b$[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Hi !
Since I'm planning a 23 cm repeater, and I am not in the USA (!)
I was thinking about buiding it on my own.
And using an atomic reference (of WWW kind) to lock it.
Since I want to be able to choose the input and output frequencies,
I need something tuneable. I thought about comb filter with three
digits, the middle one being tuned by a varicap (or PIN diode).
Does anybody have any experience in this field ?
Should I use a YIG instead ?
Another form of filter ?
What noise can I expect from such a system ?

I thank you in advance for any suggestion

Vince, F5RCS

--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From [e-mail] Sat Feb 17 13:44:37 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!atl.com!ldesot
From: [e-mail] (Larry DeSoto)
Subject: Re: 813 Xmtr for 160M
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: atl.com
Organization: Advanced Technology Laboratories
References: <287cc$[e-mail]> <4fnihv$[e-mail]>
Distribution: usa
Date: Wed, 14 Feb 1996 01:24:22 GMT
Lines: 20

In article <4fnihv$[e-mail]>, Tom Pfaffenbach <tvpfaffe@mai
l.delcoelect.com> writes:
> The 1953 ARRL Handbook has an excellent design for a single 813 transmitter.
 It uses a 6AG7
> oscillator, 6L6 driver, 6Y6 clamper and an 813 as Power Amplifier. A Classic
 1930's design!
>
> Fair Radio in Lima Ohio has the ART-13 available in surplus again for $150.
It covers 2-18 Mhz
> (and is easily re-worked for 160 thru 10 meters) and uses an 813 modulated w
ith a pair of
> 811's. You might have more fun rebuilding the ART if you just want to run th
e 813's!
>

Hey, I had one of these things many years ago.  Watching the autotune
operate is more fun than a barrel of monkeys.  What's the address for
Fair Radio?


--
Larry                                 *************************
                                      *                       *
                                      *  Speaking for myself  *
                                      *                       *
                                      *************************


From [e-mail] Sat Feb 17 13:44:38 1996
Path: news.epix.net!news.sprintlink.net!lori.albany.net!news.sover.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!noc.nyx.net!nyx10.cs.du.edu!not-for-mail
From: [e-mail] (larry kollar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A successfull recipe
Date: 9 Feb 1996 21:04:19 -0700
Organization: University of Denver, Dept. of Math & Comp. Sci.
Lines: 12
Message-ID: <4fh5g3$[e-mail]>
References: <4fdhuf$[e-mail]>
NNTP-Posting-Host: nyx10.nyx.net

In article <4fdhuf$[e-mail]>,
EeebyJeeby <[e-mail]> wrote:
>SAVE NOW!! FILE IS TOO LONG TO BE READ!
 ^^^^
    | You misspelled "skip."

>From: [e-mail] [e-mail]
>Date: 2nd Feb 1996 10:30:14pm
--
Larry Kollar, Dawsonville GA  | *** Hatred is murder *** (1 Jn 3:15)
[e-mail]              | http://www.nyx.net/~lekollar/
                  "His third dimension done been re-VOKED!"


From [e-mail] Sat Feb 17 13:44:39 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!scanner.worldgate.com!rover.ucs.ualberta.ca!news.sas.ab.ca!drygalo
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Any ham VHF prop map pgms?
Date: 14 Feb 1996 18:18:48 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 6
Message-ID: <4ft928$[e-mail]>
NNTP-Posting-Host: fn1.freenet.edmonton.ab.ca
X-Newsreader: TIN [version 1.2 PL2.4]

Does anyone know of a moderate cost (cheap) VHF/UHF propagation coverage
mapping program out there for DOS?  We have a good sprinkling of
repeaters out here and it would be a usefull project to put a booklet
together with coverage contours.  That would make using the repeaters
much easier when traveling.  73 de VE6MIL  !



From [e-mail] Sat Feb 17 13:44:40 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bofh.mi.org!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!mksim8!blair
From: [e-mail] (Art Blair)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone else read Bowick's RF circuit Design?
Date: 14 Feb 1996 02:24:50 GMT
Lines: 16
Message-ID: <4frh5i$[e-mail]>
References: <[e-mail]> <4fk0iv$cpl$[e-mail]>
NNTP-Posting-Host: mksim8.dseg.ti.com
X-Newsreader: TIN [version 1.2 PL2]

ChrisBowick wrote:
: I am considering an update to the book (2nd Edition) and would be
: interested in any input, suggestions, corrections, etc. that any
: of you might have.  Perhaps we can make it an even better
: reference book in the future!

Since you posted without an email address I guess I'll reply
here...
Since you asked... How about a chapter on microstrip design? I`ve
yet to find a usable book on the subject. I've seen alot of
theoretical tomes with scads of waveguide theory but nothing
on how to design, say, a filter with printed spiral inductors
and interdigital capacitors.
Luv the book,
Art.



From [e-mail] Sat Feb 17 13:44:42 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.flinet.com!usenet
From: chuck <[e-mail]>
Newsgroups: rec.radio.shortwave,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.swap
Subject: Broadcasting Radio Station Database for you......
Date: 12 Feb 1996 04:04:46 GMT
Organization: Orchid City Software
Lines: 28
Message-ID: <4fme8u$[e-mail]>
NNTP-Posting-Host: wpb46.flinet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)
Xref: news.epix.net rec.radio.shortwave:70065 rec.radio.amateur.antenna:19052 rec.radio.amateur.digital.misc:14132 rec.radio.amateur.equipment:24923 rec.radio.amateur.homebrew:13323 rec.radio.amateur.misc:98059 rec.radio.amateur.policy:33090 rec.radio.amateur.space:6321 rec.radio.noncomm:5156 rec.radio.scanner:45512 rec.radio.swap:57465

Friend,

A fully functional standalone Broadcasting Radio Station Database for IBM
and compatibles with more than 4,000 Radio Station records already.  This
program covers stations on Longwave, Mediumwave, and Shortwave.  Each
record contains the Station name, Frequencies, Schedule, Languages,
Country, and Continent.  The program sorts in same order.

What's needed to get it?  Your EMail address and your Postal Mailing
address for registration and future information via Post of other Radio
Related Database programs.  This information will be kept confidential.

If you can read a document written in MS Word(extension is DOC), request
the operating instructions for the Radio Station Database Program called
Voyageur.  You'll get an idea from reading this document of the Voyageur
Database and what it does.

Incidently, the program offered with this notice is valid until June 6,
1996.

Hope to hear from you..

Chuck

KA4PRF





From [e-mail] Sat Feb 17 13:44:43 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!cambridge-news.cygnus.com!news3.near.net!news.ner.bbnplanet.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Frank L. Jamison )
Newsgroups: rec.radio.amateur.homebrew
Subject: Computerized Vacuum Tube List
Date: 16 Feb 1996 18:30:55 GMT
Organization: Netcom
Lines: 6
Message-ID: <4g2igv$[e-mail]>
NNTP-Posting-Host: ix-btr-la1-22.ix.netcom.com
X-NETCOM-Date: Fri Feb 16 10:30:55 AM PST 1996

I am trying to determine if a CD-ROM or Floppy Disk exists listing all
Vacuum Tubes.  It would be preferable if the program had a database of
individual tube specifications but a simple listing would be
satisfactory.  Any help will be appreciated.
    Frank 'Jamie' Jamison - W5YSM - Email:  [e-mail]



From [e-mail] Sat Feb 17 13:44:44 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!nott!bcarh189.bnr.ca!crchh327.rich.bnr.ca!b4pph13e!cnc23a
From: [e-mail] (Ken Edwards)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: DS-1A (DC-DC converter for Kenwood) question
Date: 14 Feb 1996 15:49:07 GMT
Organization: Bell-Northern Research, Ottawa, Canada
Lines: 29
Distribution: world
Message-ID: <4ft09j$[e-mail]>
NNTP-Posting-Host: b4pph13e.bnr.ca
Xref: news.epix.net rec.radio.amateur.homebrew:13341 rec.radio.amateur.misc:98091

I have a Kenwood TS-820S that I would like to run off battery in
cases of emergency.  And as a (good ?) homebrew project, I thought
I could emulate the offering from the manufacturer.  Problem is,
the information in the back of the service manual is sufficently
ambigeous enough that I have a few questions.

Is the transformer shown part of the DC-DC converter kit, or is
it the one already in the radio, with the barrier strip that already
has the matching color coded wires ?

The drawing shows the same connector as used for AC input, but wired
for DC, then another "power connector" thet does not appear to match
the previous which interrconnects with the barrier strip.  How exactly
is the power (DC) connected into the system ?


Any other hints/explainations on this 'project' would be welcomed.


Thanks..

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

Ken M. Edwards, PE                  Nortel, Research Triangle Park, NC
[phone]      email: [e-mail]

All opinions are my own and do not necessarily reflect the views of
my employer or co-workers, family, friends, congress, or president.


From [e-mail] Sat Feb 17 13:44:45 1996
Path: news.epix.net!uunet!in2.uu.net!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dummy load
Date: 14 Feb 1996 03:02:46 GMT
Organization: University of Colorado, Boulder
Lines: 58
Message-ID: <4frjcm$[e-mail]>
NNTP-Posting-Host: spot.colorado.edu

>From [e-mail] Fri Feb  9 17:37:46 MST 1996

   [e-mail] (TIEMANN BRUCE) wrote:

>>These dummy loads work well past VHF frequencies and handle 2 watts
>>OK, everybody flame me now.  N6OTQ

>I'll bite...
>"VHF frequencies" = very high frequency frequencies

>Actually, the first post was correct.  The phrase "Very High
>Frequency" (abbreviated as "VHF") is an adjective.  Despite the fact
>that we often treat it as a noun, such use is grammatically incorrect.
>"VHF" must be followed by the object it modifies, such as "band",
>"frequency", "transmitter", "antenna", etc.

Thanks for your correction!  I'll be sure to update my dictionaries, which
claim "frequency" is only a noun, including the online one (and therefore
that "very high frequency" is also, just a particular piece of it):

spot> webster frequency

fre.quen.cy \-kw*n-se-\ n 1: the fact or condition of occurring frequently
   2a: the number of times that a periodic function repeats the same sequence
   of values during a unit variation of the independent variable 2b: the
   number of individuals in a single class when objects are classified
   according to variations in a set of one or more specified attributes 3: the

   number of repetitions of a periodic process in a unit of time : as 3a: the
   number of complete alternations per second of an alternating current 3b:
   the number of sound waves per second produced by a sounding body 3c: the
   number of complete oscillations per second of an electromagnetic wave

and that VHF does _not_ mean "the band between 30 and 300 MHz of the
electromagnetic spectrum," as erroneously defined on spectrum allocation
charts, but is actually just a modifier.

I've got lots of updating to do:  Turns out "dog" and "computer" are also
adjectives, as in "dog cage" and "computer screen" - just like "VHF radio"
and "VHF antenna."  Zounds!  Turns out _every_ noun is an adjective.  "Noun"
is an an adjective when used in "noun list"; it just modifies 'list'!

But before I do that, I have lots of other things to do.  I better check the
SWR ratio of my HF frequency antenna, because the ATU tuning unit blew an FET
transistor, keeping me from tuning all the way up to the MUF frequency.  In
which case I'll have to go the the ATM machine (and type in my PIN number) to
get some money to buy more IC circuits for the TTL logic part of the CPU
unit's LED diode (and CRT tube) display driver, since it's all SNAFU'd up.
Too much DC current on the RF frequency (not the VHF frequency) RFI
interference blocking choke.  Or was it EMI interference, and AC current?  I
better get out the DMM meter, and follow the trouble-shooters standard SOP
operating procedure.

I hate it when that happens.

Very best 73s's, and CUL later.

Bruce
N6URH


From [e-mail] Sat Feb 17 13:44:46 1996
Path: news.epix.net!news.sprintlink.net!shore4.intercom.net!usenet
From: "Steven A. Bailey" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Ferric Chloride Question
Date: 14 Feb 1996 01:43:12 GMT
Organization: Skipjack.net
Lines: 7
Message-ID: <4freng$[e-mail]>
NNTP-Posting-Host: modem224.intercom.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)

I am wondering the ramifications of dumping some
dilluted ferric chloride out in my yard (used for
PCB etching).  Seems this is a very weak acid...even
when at full strength.  Any ideas are welcome.

Steve



From [e-mail] Sat Feb 17 13:44:47 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!news.ruhr-uni-bochum.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ferric Chloride Question
Date: 15 Feb 1996 17:05:46 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 12
Message-ID: <4fvp5a$[e-mail]>
References: <4freng$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>I am wondering the ramifications of dumping some
>dilluted ferric chloride out in my yard (used for
>PCB etching).  Seems this is a very weak acid...even
>when at full strength.  Any ideas are welcome.

There are two catches: Although copper salts are relatively non-toxic
for humans, they are highly toxic for bacteria etc. and therefore
enviromentally harmfull. Also the ferric chloride is very aggressive,
during hydrolysis it releases substantial amounts of hydrochloric acid.

You have been warned. 73, Moritz DL5UH



From [e-mail] Sat Feb 17 13:44:48 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ferric Chloride Question
Date: Thu, 15 Feb 96 10:58:24 PDT
Organization: Northwest Nexus Inc.
Lines: 32
Message-ID: <[e-mail]>
References: <4freng$[e-mail]>  <4fthmc$[e-mail]>
NNTP-Posting-Host: blv-pm1-ip18.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage



> >I am wondering the ramifications of dumping some
> >dilluted ferric chloride out in my yard (used for
> >PCB etching).  Seems this is a very weak acid...even
> >when at full strength.  Any ideas are welcome.
> >
> >Steve
> >
>
> I believe that if you dilute it well you may spray it on your yard
and it will do a
> nice job of greening it up(in warm weather, of course). Ferric
cloride is acidic
> but not a strongly so as, say hydrogen cloride(muriatic acid), since
iron does not
> hold on to its outer electrons as well(being large) as hydrogen, and
so ionizes much
> more easily. Iron plays an important role in the manufacture of
clorophyll and this,
> of course makes the grass green.
>
>
What about all that dissolved Copper??  I believe that the EPA
considers FeCl a hazardous material.

73 de KI7RH

p.s. that's how we got rid of it in the old days (before we knew any
better).




From [e-mail] Sat Feb 17 13:44:49 1996
Path: news.epix.net!uunet!in2.uu.net!gatech!newsjunkie.ans.net!newsfeeds.ans.net!lexis-nexis!news
From: [e-mail] (John Heck)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ferric Chloride Question
Date: 14 Feb 1996 20:46:04 GMT
Organization: Mead Data Central, Dayton OH
Lines: 19
Distribution: world
Message-ID: <4fthmc$[e-mail]>
References: <4freng$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: beans.lexis-nexis.com

In article [e-mail], "Steven A. Bailey" <[e-mail]> w
rites:
>I am wondering the ramifications of dumping some
>dilluted ferric chloride out in my yard (used for
>PCB etching).  Seems this is a very weak acid...even
>when at full strength.  Any ideas are welcome.
>
>Steve
>

I believe that if you dilute it well you may spray it on your yard and it will
 do a
nice job of greening it up(in warm weather, of course). Ferric cloride is acid
ic
but not a strongly so as, say hydrogen cloride(muriatic acid), since iron does
 not
hold on to its outer electrons as well(being large) as hydrogen, and so ionize
s much
more easily. Iron plays an important role in the manufacture of clorophyll and
 this,
of course makes the grass green.






From [e-mail] Sat Feb 17 13:44:50 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!multiverse!hookup!news.mathworks.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.uwa.edu.au!swing.iinet.net.au!opera.iinet.net.au!news
From: [e-mail] (Richard Hosking)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: File formats to download
Date: Mon, 12 Feb 1996 23:08:47 GMT
Organization: iiNet Technologies Pty Ltd
Lines: 20
Message-ID: <4foh5t$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: grunge26.nv.iinet.net.au
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net sci.electronics.design:2840 rec.radio.amateur.homebrew:13325


G,day from Oz

I am setiing up a web page with articles on various topics in RF and
digital design. Current interests are DDS systems, SSB phasing
receivers and the PIC

Any ideas re

The best document format to download files?

Any sites with info on these topics?

Richard Hosking VK6BRO

VK6BRO
51 Sulman Rd
Wembley Downs
WA 6019



From [e-mail] Sat Feb 17 13:44:51 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!gatech!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!usenet
From: [e-mail] (Rit Keiter)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: File formats to download
Date: Thu, 15 Feb 1996 02:41:10 GMT
Organization: GNN
Lines: 54
Message-ID: <[e-mail]>
References: <4foh5t$[e-mail]>
NNTP-Posting-Host: www-14-50.gnn.com
X-GNN-NewsServer-Posting-Date: 14 Feb 1996 14:41:25 GMT
X-Newsreader: Forte Agent .99d/16.182
Xref: news.epix.net sci.electronics.design:2858 rec.radio.amateur.homebrew:13336

[e-mail] (Richard Hosking) wrote:
>G,day from Oz
>
>I am setiing up a web page with articles on various topics in RF and
>digital design. Current interests are DDS systems, SSB phasing
>receivers and the PIC
>
>Any ideas re
>
>The best document format to download files?
>
>Any sites with info on these topics?
>
>Richard Hosking VK6BRO
>
>VK6BRO
>51 Sulman Rd
>Wembley Downs
>WA 6019
>
>Any sites with info on these topics?

Recently, I was so impressed with Adobe's Acrobat PDF (Portable
Document File) format, that I bought 300 shares of their stock.  I
also purchased their $125 Adobe Exchange for win that produces .pdf's
from any app that can print to a windows printer.  Portable means all
platforms; Windows, Macs, Unix.

Adobe has a free download of Acroread, which is a subset of the
Exchange SW that allows reading and printing *.pdf's.

I discovered Acrobat by visiting the Maxim Integrated Products site
(search on maxim).  They have a link to the free reader download.   I
downloaded a 10 page Maxim data sheet in 45 seconds at 14.4 K.  I was
astounded by the quality and detail of the line art and the tiny
fonts.  It took 4 minutes to print on an old HP laser III without
Postscript capability.  May be much faster with Postscript printers.

I have used Exchange on a 255K WordPerfect document containing several
Acad generated line dwgs, to produce a 110K PDF that prints with no
perceptible degradation.

I see now that Motorola is also using Acrobat PDF, and a CD sampler
from Adobe implies that the Dept of Defense is standardizing on PDF
and using the Adobe Capture product to archive all DOD legacy paper
documents.

The CD sampler contains the complete works of Shakespeare, a complete
issue of the London Herald, several informative videos and lots more.
Adobe sent it to me free and that is where I discovered the $125
special offer for Exchange.

My Adobe stock is doing very well.
Rit Keiter


From [e-mail] Sat Feb 17 13:44:52 1996
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.swap,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: FS PTS 160, 100KHz to 160MHz 1Hz resolution DAS synthesizer.
Date: 14 Feb 1996 23:22:05 GMT
Organization: -.-. --.-     -.. -..-
Lines: 12
Message-ID: <4ftqqt$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news.epix.net rec.radio.swap:57598 rec.radio.amateur.misc:98105 rec.radio.amateur.homebrew:13350 rec.radio.amateur.equipment:24965

I have a mint PTS160 frequency Synthesizer by Programmed Test Sources.
It generates carriers from 100 KHz to 160 MHz in 1 Hz steps. The unit uses
Direct Analog Synthesis and can switch frequencies in extremely short times.
Power is adjustable from the front panel up to around 15dBm. Unit is calibrate
d
and within 1Hz of WWV. This unit sells new from PTS for over $7000. Asking
$1200. OBO. Unit has TCXO, GPIB, Rack mount and other options.

AC4OP
Pieter
[e-mail]




From [e-mail] Sat Feb 17 13:44:53 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!psgrain!newsfeed.internetmci.com!in2.uu.net!news.ios.com!usenet
From: [e-mail] (Blackshadow)
Newsgroups: rec.radio.scanner,alt.radio.scanner,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: FT-8500 Need Mods
Date: 13 Feb 1996 03:05:45 GMT
Organization: Frequency Spectrum
Lines: 8
Message-ID: <4fov69$[e-mail]>
NNTP-Posting-Host: 205.147.154.75
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news.epix.net rec.radio.scanner:45599 alt.radio.scanner:27506 rec.radio.amateur.misc:98108 rec.radio.amateur.equipment:24966 rec.radio.amateur.homebrew:13353



      Someone have the mods for FT-8500?


Email: [e-mail]
N2RVM



From [e-mail] Sat Feb 17 13:44:54 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!caen!kuhub.cc.ukans.edu!kuhub.cc.ukans.edu!nntp
Newsgroups: rec.radio.amateur.homebrew
Subject: GIANT  E.F. JOHNSON  VARIABLE  CAPACITOR  FOR  SALE
Message-ID: <[e-mail]>
From: Bill <[e-mail]>
Date: 15 Feb 96 21:15:15 CST
Nntp-Posting-Host: kuts9p10.cc.ukans.edu
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain
Lines: 32

AIR-VARIABLE TRANSMITTING CAPACITOR

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

Manufacturer:           E.F. Johnson Co.
                        Waseca, Minn.
                        U.S.A.

PART NO:                150DD70

CAP uuf               * 150 X 2

VOLTS:                * 7000

AIR GAP:              * .175

SIZE:                   approx  14 inch  X  4.5 inch

COMMENTS:             * Ratings apply to each section of this multiple
                        section condenser.

                        Includes insulated (steatite) shaft coupling.

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

Would anyone care to make an offer on this beauty?

73s

Bill
AA4FM/0



From [e-mail] Sat Feb 17 13:44:55 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!rain.fr!world-net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design
Subject: Re: Help design coil for coupling 2 amplifiers
Date: Fri, 16 Feb 1996 13:21:31 GMT
Organization: World-Net information exchange, Internet provider.
Lines: 14
Message-ID: <4g20kf$[e-mail]>
References: <4fkhdu$[e-mail]>
NNTP-Posting-Host: client66.sct.fr
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.homebrew:13381 sci.electronics.design:2967

 Hi everybody

Thanks a lot for documented answers.

In order I learn something, is there a pratical book a pointer on the
net where I can get more informations about Wilkinson splitter ?

Regards


Have
a nice                    [e-mail]
Day



From [e-mail] Sat Feb 17 13:44:56 1996
Path: news.epix.net!uunet!in1.uu.net!news.icanect.net!news.sprintlink.net!sparky.midwest.net!usenet
From: [e-mail] (Dan Reynolds)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with Icom u2sat HT - Batt. packs
Date: Wed, 14 Feb 1996 13:08:16 GMT
Organization: Midwest Internet
Lines: 14
Message-ID: <4fsmdf$[e-mail]>
NNTP-Posting-Host: decatur14.midwest.net
X-Newsreader: Forte Free Agent v0.55

Help me! Please!

I have an Icom u2sat HT.  It uses a battery pack smaller, but similar
to the Icom 2sat, HTX202, etc....  The packs themselves are no longer
available.  Anybody have any ideas of any other packs that might work
or connectors, etc.  I wouldn't care if I had to put batteries in
them.  Any ideas on what the regulator circuit would look like?  I
really like this little HT, I bought it "new" at a hamfest last summer
and other than finding batteries for it, it has been a great HT, my
first 2 meter rig!
TNX, Dan Reynolds, KB9JLO, [e-mail]
Peace+
Dan Reynolds, [e-mail], KB9JLO



From [e-mail] Sat Feb 17 13:44:56 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!nntp.coast.net!chi-news.cic.net!news.compuserve.com!newsmaster
From: Dietrich Morgenstern <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Homebrew GPS RX
Date: Thu, 15 Feb 1996 21:54:43 +0100
Organization: NN
Lines: 11
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ad41-136.compuserve.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Macintosh; I; 68K)

About 2 years ago there was a very detailed description of a
homebuilt GPS Rx in the german journal UKW-Berichte.
It went over several issues and if I remember correctly there were
detailed schematics.
The author was a very wellknown Yougoslawian amateur.
The article was in the german language.
Hope this helps

Dietrich DJ1VA

NB.: The rx was also suitable for GLONASS.


From [e-mail] Sat Feb 17 13:44:58 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: "Gary P. Fiber" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: ICOM IC-2SAT HELP!?
Date: 14 Feb 1996 04:25:02 GMT
Organization: Northwest Nexus Inc.
Lines: 33
Message-ID: <4fro6u$[e-mail]>
References: <4fm7ts$no7$[e-mail]>
NNTP-Posting-Host: blv-pm12-ip28.halcyon.com
Mime-Version: 1.0
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Xref: news.epix.net rec.radio.amateur.equipment:24945 rec.radio.amateur.homebrew:13339 uk.radio.amateur:10905


>1) does this radio have a tone burst for reapeter use ,if so how
>is it operated?

On the 2SAT, 1750 Hz burst could be added if the serial number was below
about 9500, also the minimum offset tuning step size needed to be 25 kHz.
Here you would need to convert the radio to a european version and install
2 SMD resisotrs.  After S/N 9500 or so the offset tuning was made
adjustable and the 12.5kHz tuning step was removed, also so was the ability
to have a 1750 hz tone burst.  The reason was to free enough memory in the
CPU to have the adjustable offset tuning steps rather than the original
fixed 25 khz tuning in the earlier model 2SAT radios.

>2) my radio seems to have rx 100-200 Mhz and tx 140-150Mhz
>but the disply will read 0-1300 Mhz. does this mean it can
>be made to receive from 0-1300 Mhz if so how?

The radio will actually receive from 110 to 136 aircraft A.M. and 136 to
174 Mhz F.M.  Signals above or below this range are usually overloads or
images.  The tuning ability never stopped in the CPU program, how ever the
VCO never had the kind of range the frequency readout would report.

Gary












From [e-mail] Sat Feb 17 13:44:59 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet
From: Philip Manning <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: ICOM IC-2SAT HELP!?
Date: 12 Feb 1996 12:45:44 GMT
Organization: University of Surrey, Guildford, England
Lines: 11
Message-ID: <4fncpo$[e-mail]>
References: <4fm7ts$no7$[e-mail]>
NNTP-Posting-Host: olympus.ee.surrey.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m)
To: [e-mail]
X-URL: news:4fm7ts$no7$[e-mail]
Xref: news.epix.net rec.radio.amateur.equipment:24972 rec.radio.amateur.homebrew:13357 uk.radio.amateur:10919

To Rob, You had better alter your Compuserve address, otherwise mail will
bounce, bring your address CompuServe.COM down to lower case, otherwise you
might not get any mail at all, if somebody copies it verbatim.

Best to address it Internet:[e-mail]

Phil G1LKJ

Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very
similar.



From [e-mail] Sat Feb 17 13:45:00 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet
From: Philip Manning <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: ICOM IC-2SAT HELP!?
Date: 12 Feb 1996 12:47:41 GMT
Organization: University of Surrey, Guildford, England
Lines: 11
Message-ID: <4fnctd$[e-mail]>
References: <4fm7ts$no7$[e-mail]>
NNTP-Posting-Host: olympus.ee.surrey.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m)
To: Internet:[e-mail]
X-URL: news:4fm7ts$no7$[e-mail]
Xref: news.epix.net rec.radio.amateur.equipment:24973 rec.radio.amateur.homebrew:13358 uk.radio.amateur:10920

To Rob, You had better alter your Compuserve address, otherwise mail will
bounce, bring your address CompuServe.COM down to lower case, otherwise you
might not get any mail at all, if somebody copies it verbatim.

Best to address it Internet:[e-mail]

Phil G1LKJ

Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very
similar.



From [e-mail] Sat Feb 17 13:45:01 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet
From: Philip Manning <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: ICOM IC-2SAT HELP!?
Date: 12 Feb 1996 12:47:47 GMT
Organization: University of Surrey, Guildford, England
Lines: 11
Message-ID: <4fnctj$[e-mail]>
References: <4fm7ts$no7$[e-mail]>
NNTP-Posting-Host: olympus.ee.surrey.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m)
To: Internet:[e-mail]
X-URL: news:4fm7ts$no7$[e-mail]
Xref: news.epix.net rec.radio.amateur.equipment:24992 rec.radio.amateur.homebrew:13365 uk.radio.amateur:10937

To Rob, You had better alter your Compuserve address, otherwise mail will
bounce, bring your address CompuServe.COM down to lower case, otherwise you
might not get any mail at all, if somebody copies it verbatim.

Best to address it Internet:[e-mail]

Phil G1LKJ

Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very
similar.



From [e-mail] Sat Feb 17 13:45:02 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!crc-news.doc.ca!usenet
From: Jim Cummings <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Ignition noise reduction
Date: 16 Feb 1996 14:06:12 GMT
Organization: Industry Canada
Lines: 29
Message-ID: <4g230k$[e-mail]>
References: <4g0j7q$[e-mail]>
NNTP-Posting-Host: cummings.jim.dgrr000.ic.gc.ca
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]
Xref: news.epix.net sci.electronics.design:2946 rec.radio.amateur.misc:98138 rec.radio.amateur.homebrew:13369

[e-mail] (Paul A. Cianciolo) wrote:
>Hello all
>
>Has anyone ever done any work to quiet down the ignition system (spark
>impulse noise) in a gasoline powered vehicle?? I wonder if one could
>use large ferrite beads to choke off the spectrum of the spark from
>radiating off the wire at the frequencies of interest. 1 mhz and
>above? I have done a lot of grounding , and am using resistor plugs
>and wires..  Are there any shielded wire kits out there?
>
>PaulC
>"Noisy in Connecticut"
>
>

Hello Paul:

I have had good success with passing the ignition cables through some Snap-On
Chokes.  However, you will have to use a large number of them because, if your

vehicle is like my Ford Ranger, there is not enough slack in the ignition cabl
es to
loop them through (I really wouldn't care to try it anyways).

I wish you luck

73 and live better digitally
Jim, VE3XJ





From [e-mail] Sat Feb 17 13:45:06 1996
Newsgroups: 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
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!mdisea!pilchuck!news
From: [e-mail] (Tom  Zoch)
Subject: Information on equipment sought by new Tech
X-Nntp-Posting-Host: inet-gw
Message-ID: <[e-mail]>
Sender: [e-mail] (Usenet news)
Reply-To: [e-mail]
Organization: Sosiity fer spelen exalanse
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Mime-Version: 1.0
Date: Fri, 16 Feb 1996 02:20:34 GMT
Lines: 50
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Hi,
I am going to be taking my Tech tests on Saturday (2/17) and am now starting
to look in to what type of radios to get. I plan to put a 2M Mobile in my
truck and get a more substantial base for home.

For home I'm looking into Base Multiband / Multimode Transceivers and trying
to decide what will be my best bet. I was thinking of one that would cover
at least 2M and perhaps 70cm. I am interested in working into Satellite and
EME as well as FM and perhaps some local CW, 12V operation would be a plus
but not a major requirement. I do plan on upgrading to at least General with
in the next year and expanding also into some HF as well. So I would want to
take that into consideration as well. possibly using Transverters get to the
higher freqs for satellite and EME and going with a more basic UHF/VHF base
unit.

For the mobile unit I was thinking of a rather simple 2M unit for repeater
and simplex FM. I live in a rather remote area in the western foothills of
the Cascades so I think one of the higher output power units would be in
order. I was considering picking up one of the new Radio Shack units. As far
as I can tell it has most everything I am looking for at a reasonable price.
From the cross talk I have seen on the net and the write up in CQ (VHF) it
seems to be a good choice.

I would like to take advantage of the wealth of experience of those out here
on the net and get some input from you as to what you think. Suggestions on
equipment to get or avoid as well as things to look for or useless features
to not even consider. For me price, value and reliability are important, I
have a modest but hopefully adequate amount set aside for starting up and
want to use it wisely. The Base unit I'll be looking for used at up coming
Ham fests so any information about current or older equipment would be
helpful.  I was thinking of picking up the Mobil new  ( if it is in or
around the same price range as the Radio Shack unit ) but am vary open to
suggestions.  I would also welcome comment on other accessory gear that you
feel would be useful as well as thoughts on band selection (pros and cons
of the diffrent amature bands ) or what ever info. you would like to pass on
to a newbie like myself. I know there are lots of books and other sources
around and would not mind pointers to the better source like that, but I am
primarily looking for personal insights and experience.

Thanks
TZ

Reply here or by e-mail to [e-mail]







From [e-mail] Sat Feb 17 13:45:07 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!nntp.coast.net!news.net99.net!premier1.premier1.net!news
From: [e-mail] (Tom)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.swap,alt.radio.amateur.club.clarc,rec.radio.amateur,rec.radio.amateur.digital.misc,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Information sought by new Tech
Date: 16 Feb 1996 18:13:31 GMT
Organization: none of the above
Lines: 48
Distribution: world
Message-ID: <4g2hgb$[e-mail]>
NNTP-Posting-Host: dynamic-39.premier1.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14
Xref: news.epix.net rec.radio.amateur.antenna:19125 rec.radio.amateur.equipment:25002 rec.radio.amateur.homebrew:13372 rec.radio.swap:57676 rec.radio.amateur.digital.misc:14200 rec.radio.amateur.misc:98147 rec.radio.amateur.policy:33120 rec.radio.amateur.space:6339


Hi,
I am going to be taking my Tech tests on Saturday  (2/17) and am now
starting to look in to what type of radios to get. I plan to put a 2M Mobile
in my truck and get a more substantial base for home.

For home I'm looking into Base Multiband  / Multimode Transceivers and
trying to decide what will be my best bet. I was thinking of one that would
cover at least 2M and perhaps 70cm. I am interested in working into
Satellite and EME as well as FM and perhaps some local CW, 12V operation
would be a plus but not a major requirement. I do plan on upgrading to at
least General with in the next year and expanding also into some HF as well.
So I would want to take that into consideration as well. possibly using
Transverters get to the higher freqs for satellite and EME and going with a
more basic UHF/VHF base unit.

For the mobile unit I was thinking of a rather simple 2M unit for repeater
and simplex FM. I live in a rather remote area in the western foothills of
the Cascades so I think one of the higher output power units would be in
order. I was considering picking up one of the new Radio Shack units. As far
as I can tell it has most everything I am looking for at a reasonable price.
>From the cross talk I have seen on the net and the write up in CQ (VHF) it
seems to be a good choice.

I would like to take advantage of the wealth of experience of those out here
on the net and get some input from you as to what you think. Suggestions on
equipment to get or avoid as well as things to look for or useless features
to not even consider. For me price, value and reliability are important, I
have a modest but hopefully adequate amount set aside for starting up and
want to use it wisely. The Base unit I'll be looking for used at up coming
Ham fests so any information about current or older equipment would be
helpful.  I was thinking of picking up the Mobil new  ( if it is in or
around the same price range as the Radio Shack unit ) but am vary open to
suggestions.  I would also welcome comment on other accessory gear that you
feel would be useful as well ( for example band selection for Satellite and
EME ), or what ever info you would like to pass on to a newbie like myself.
 I know there are lots of books and other sources around and would not mind
pointers to the better source like that, but  I am primarily looking for
personal insights and experience .

Reply here or  by  e-mail to    [e-mail]

Thanks
TZ






From [e-mail] Sat Feb 17 13:45:09 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!thunder.mgl.ca!granite.sentex.net!torn!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!felix.teclink.net!usenet
From: Thomas Martin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood 241
Date: 10 Feb 1996 03:37:05 GMT
Organization: Martin Enterprises
Lines: 14
Message-ID: <4fh3t1$[e-mail]>
NNTP-Posting-Host: tc2_46.teclink.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)

Does anyone know what causes the infamous problem with the 241
display going haywire? It has to be documented somewhere. I
know 4 people with the same problem in my area but noone knows
how to fix it.

If I could find out what the problem is I think I could repair
the rig.

Thanks for any help.

Thomas Martin N5ZNO
[e-mail]




From [e-mail] Sat Feb 17 13:45:10 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.luc.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: More NP0 vs. C0G Capacitors Thoughts
Reply-To: [e-mail]
Organization: Motorola Satellite Communications
Date: Thu, 15 Feb 1996 15:48:45 GMT
Message-ID: <[e-mail]>
References: <4ft9t0$[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
Lines: 20

>Since no one else has come forward, I'll offer my two cents worth.  NPO
>stands for Negative-Positive-Zero.  COG is a type of ceramic dielectric, much

>as Z5U and X7R are.  COG is considered to be an NPO, whereas Z5U and X7R
>capacitors vary radically with temperature.

I think that some of the negative experiences that I have had with drift
and COG capacitors could be due in part to their small size (I have a very
difficult time even reading the markings on the tiny little things).  The
NPOs that I have dealt with are quite large in comparison to the *very* small
size of the NPOs.

With such a small size, any RF heating of the part will cause a significantly
higher temperature rise in a very small part than a much larger one.  This
*could* have accounted for the effect I was seeing.

- Dan Tayloe, WB0NVB, Phoenix, AZ






From [e-mail] Sat Feb 17 13:45:10 1996
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!torn!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc
Subject: Re: Morse code to text display wanted
Date: 9 Feb 1996 00:44:49 GMT
Organization: Dover Research Corp.
Lines: 6
Message-ID: <4fe5e1$ecl$[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:13321 rec.radio.amateur.equipment:24913 rec.radio.amateur.digital.misc:14127

Hamcom uses a simple 741 interface to an unused comm port and also decodes
CW, RTTY, SSTV and AMTOR.  I've got some boards that will do this that I will
let go for $10 (You build em!)
E-Mail me if you are interested.
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Sat Feb 17 13:45:12 1996
Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!nntp.inet.fi!news.tele.fi!uunet!in2.uu.net!brighton.openmarket.com!decwrl!tribune.usask.ca!duke.usask.ca!buydens
From: [e-mail] (Brian Buydens)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc
Subject: Re: Morse code to text display wanted
Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc
Date: 12 Feb 1996 15:58:22 GMT
Organization: University of Saskatchewan
Lines: 30
Message-ID: <4fno2u$[e-mail]>
References: <4du55d$[e-mail]>  <4e11t1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: duke.usask.ca
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.homebrew:13331 rec.radio.amateur.equipment:24937 rec.radio.amateur.digital.misc:14143


I believe the SuperMorse program also has provisions for translating cw to tex
t.


Brian.


Ference Kish ([e-mail]) wrote:

: > >
: > >Hi. My dad is a Ham operator, and asked me if there were some
: > inexpensive
: > >way to have incoming Morse code automatically translated and displayed
: > on
: > >a CRT. Since I know nothing about Ham radio, I thought I'd post here.

: There is a program called MORSEFFT which you should be able to find on the n
et
: (use ARCHIE to find the site storing it )

: It needs a sound blaster card as an input device. It comes with C source cod
e,
: too



--
Brian Buydens                        There was a young poet named Dan,
Department of Computing Services     Whose poetry never would scan.
University of Saskatchewan           When told this was so,
email: [e-mail]        He said, "Yes, I know.
VE5RDV


From [e-mail] Sat Feb 17 13:45:14 1996
Path: news.epix.net!news.sprintlink.net!itnews.sc.intel.com!chnews!ornews.intel.com!news.ssd.intel.com!uunet!in2.uu.net!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!tube.news.pipex.net!pipex!lade.news.pipex.net!pipex!news00.sunet.se!sunic!news.sprintlink.net!ionews.ionet.net!usenet
From: [e-mail] (Martin T. Vinson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola MICOR - Repeater MOD
Date: 10 Feb 1996 07:15:14 GMT
Organization: Internet Oklahoma
Lines: 30
Message-ID: <4fhgm2$[e-mail]>
References: <4et38i$[e-mail]>
NNTP-Posting-Host: osip119.ionet.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

In article <4et38i$[e-mail]>, [e-mail] says...
>
>Does any one have any info on modifying the Motorola MICOR to
>be a repeater?  I saw this ad in a recent copy of CQ and was
>wondering what the specs were and what it entails.
>
Vhf or UHF ????????????   The VHF is easy, as the TX and RX are two
separate strips.  Just cut a couple of jumpers, add a couple of jumpers
and tada - instant repeater.  (Complete with built in desense and the
shielding is inadequate)  The UHF version is a bit more complicated.
The TX oscilator is derived from the RX LO.  You have to change the
offset xtal and rewind a coil to shift the offset from +5Mhz. to
-5Mhz....The rest is easy.  Has a lot of problems with RF getting into
the PL encoder on the UHF conversions.  Don't do them anymore....
The internal shielding really isn't quite good enough to make a real
repeater out of it....Additionally, the UHF version is real flaky,
the LPA and IPA decks fail often and are real expensive and hard to
find.  It is easier to build a repeater from a Master II GE but I would
still separate the transmitter and receiver into separate units.  I
have built 15 or 20 of them that way.

Martin, KN6UG
>--
>Al Wong                 The above opinion is mine, and does
>KF4GDD                  not reflect that of my employer.  As
>[e-mail]        with all my opinions, I write them, you
>                        interpret them.
>
>



From [e-mail] Sat Feb 17 13:45:15 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!xetron.com!news
From: [e-mail] (Jack Giehl)
Subject: Need Globar Resistor Info
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: jackg.xetron.com
Reply-To: Jack Giehl <[e-mail]>
Organization: Xetron Corp.
X-Newsreader: WinVN 0.93.02
Mime-Version: 1.0
Date: Wed, 14 Feb 1996 17:49:14 GMT
Lines: 7

Hi,

I am looking for a supplier or an address/phone number for
Globar resistors.

Thanks, Jack, WB8BFS



From [e-mail] Sat Feb 17 13:45:16 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!usenet
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need ID: Motorola final/ MRF327-8851
Date: Mon, 12 Feb 1996 22:18:18 GMT
Organization: The Coriolis Group, Inc.
Lines: 35
Message-ID: <4foee7$[e-mail]>
References: <4fkc8c$[e-mail]>
NNTP-Posting-Host: 165.247.88.102
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (RICKCRIDER) wrote:

>Peering inside of an amplifier that I aquired at a military surplus store,
>trying to figure out what band it is for and what the power output is.
>It takes a 28v DC power supply.  Has 'N' type connectors for in and out.
>Made by 'TPL Com Inc.
>Inside there are five identical circuit boards tied together, with the
>heart of each board appearing to be Motorola brand finals.   White ceramic
>looking discs, about 1/2" in diameter and 1/8" thick.   On them is the
>Motorola logo and the following:
>MRF327 (on the top line) and 8851 directly under the top line.   Any
>techies out there know what frequencies these may operate at, and at what
>power output?
>I really have no idea what I have here.   It is modern, and brand new.
>Just don't know how to figure out what it was made for.

Another gentleman described the device itself, and I'll add that the
"8851" means the part was manufactured in 1988.  The "51" could mean
Day 51 or May 1.  These codes vary, tho I'll bet the military has a
standard, which I don't know.

Fersure don't miss Motorola's Web site:

http://motserv.indirect.com/

There is a HUGE amount of information there, including a lot of nice
downloadable data sheets in Adobe Acrobat format.

Good luck with that rig.

--73--

--JD--




From [e-mail] Sat Feb 17 13:45:17 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.slic.com!usenet
From: Chris Tabor <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Info on 2Gig band
Date: Wed, 14 Feb 1996 11:40:07 -0500
Organization: Edwards Productions
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: nich_dial12.slic.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6a (Win95; I)

Hello,
I am trying to find a 2 gig amp, or some info.
Can anyone help me?
--
-C
--H
---R
----I
-----S
______________________________________________________________________


From [e-mail] Sat Feb 17 13:45:18 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RStapestry)
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED SCHEMATICS FOR GPS RECIEVER
Date: 13 Feb 1996 20:51:22 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <4frf6q$[e-mail]>
Reply-To: [e-mail] (RStapestry)
NNTP-Posting-Host: newsbf02.mail.aol.com

Please, anyone with the schematics for a GPS reciever.
I'm 16 and I really want to make my own GPS unit.
If you know of any information like this, please e-mail me.


From [e-mail] Sat Feb 17 13:45:18 1996
Path: news.epix.net!news.sprintlink.net!news.fast.net!news
From: Tony <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NEW HAMFEST !!!
Date: 16 Feb 1996 23:09:25 GMT
Organization: FASTNET(tm) PA/NJ/DE Internet
Lines: 7
Message-ID: <4g32r5$[e-mail]>
NNTP-Posting-Host: abe-ppp213.fast.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1PE (Windows; I; 16bit)

THE FIRST NORTHWEST NEW JERSEY HAMFEST
will be held on April 28 1996
at the Budd Lake Fire House
route 46 Budd Lake, NJ
for more info look to "THE HAM-STRING"
at http://www.users.fast.net/~n3itn/



From [e-mail] Sat Feb 17 13:45:19 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!tank.news.pipex.net!pipex!howland.reston.ans.net!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news
From: [e-mail] (Bill Sorsby)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NP0 vs. C0G Capacitors
Date: 14 Feb 1996 18:33:04 GMT
Organization: Texas Instruments
Lines: 29
Message-ID: <4ft9t0$[e-mail]>
References: <4f8m9j$[e-mail]>
NNTP-Posting-Host: wsorsby.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <4f8m9j$[e-mail]>, [e-mail]
says...
>
>I'm seeing conflicting information on the technical specifications (i.e.,
>temperature coefficient) of NP0 and C0G capacitors.  Some sources
>indicate they're identical; others show slight percentage differences
>between the two.


Hi Paul,

Since no one else has come forward, I'll offer my two cents worth.  NPO
stands for Negative-Positive-Zero.  COG is a type of ceramic dielectric, much
as Z5U and X7R are.  COG is considered to be an NPO, whereas Z5U and X7R
capacitors vary radically with temperature.

I'm not aware of a standard, although there could be one.  If your
application is critical it may be wise to consult the manufacturer's data
sheets for exact specifications on a particular device.  Manufacturing
processes also affect drift characteristics so similar capacitors from
different manufacturers, using the same dielectric material, while close,
will display predictably different drift characteristics.

Hope this is of some help.


Regards,
Bill Sorsby, N5BU



From [e-mail] Sat Feb 17 13:45:20 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.luc.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: Re: NPO vs. COG Capacitors
Reply-To: [e-mail]
Organization: Motorola Satellite Communications
Date: Thu, 15 Feb 1996 15:39:31 GMT
Message-ID: <[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
Lines: 16


>Since no one else has come forward, I'll offer my two cents worth.  NPO
>stands for Negative-Positive-Zero.  COG is a type of ceramic dielectric, much

>as Z5U and X7R are.  COG is considered to be an NPO, whereas Z5U and X7R
>capacitors vary radically with temperature.

Last year I tried using COG capacitors in a VFO design.  My local supplier
had commented that COG is the same as NPO.  In my case, I found that the
resulting drift was *much* worse than the assorted NPO capacitors I had been
using.

Of course, your mileage may vary....

- Dan Tayloe, WB0NVB, Phoenix, AZ




From [e-mail] Sat Feb 17 13:45:22 1996
Path: news.epix.net!news.sprintlink.net!ratty.wolfe.net!news.aa.net!tsunami.ixa.net!news.ironhorse.com!sloth.swcp.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!ncar!imci4!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 12 Feb 1996 08:29:22 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 43
Message-ID: <4fmtp2$[e-mail]>
References: <willmore.823905417@whelk> <4fiqeh$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <4fiqeh$[e-mail]>, Tom Bruhns <[e-mail]> wrote
:
>David A Willmore ([e-mail]) wrote:
>: It seems that every time I look for information on PLL loop filter design,
>: they focus on simple implementation of the loop filter.  Is it because
>: simple one or two pole filters are the ideal filters for this use or
>: is there some other design constraint involved?  The filter only has to
>: work in the audio range--from my understanding.  Would a brick wall, low
>: pass filter of a high order be a better solution?  What if you could widen
>: the passband while tuning and narrow it down once you have aquired lock?
>
>The problem is that the filter is part of a closed-loop feedback control
>system.  If you have unity gain and net 360 degrees phase shift in the
>loop, you are going to have oscillations.  Since high-order filters have
>large phase shifts where their gain is still high, they aren't appropriate
>for use in a closed loop.

What is important to look at is the loop Bode plot; it is easy to design
a filter to one particular parameter (minimum reference feedthrough OR
fast lock-up time OR ..., etc.) but the real task is to balance between
several conflicting design goals, one of which is loop stability.  A Bode
plot of the loop response is important (and not difficult to do) to
make sure the loop is stable.  At the same time, be sure to take into
account the changing loop parameters (mostly VCO gain) over the operational
range; you'll need to calculate loop stability at both extremes of VCO
gain to make sure it doesn't break into oscillaton (don't forget to include
overshootas part of the VCO extreme).

Don't forget that noise in the loop filter directly translates to
noise in the VCO output, and more complicated filters tend to be
noisier, which can ruin otherwise good phase noise performance.

Of course, the filter is there to stabilize the loop and minimize
undesired reference frequency modulation of the VCO, so you might do
as suggested in one Motorola app note and design the "right" loop
filter and then follow this with a notch filter at the reference
frequency in order to gain a way to independently achieve both goals.

Also, don't forget I'm a computer programmer and not a PLL designer ;-)

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Sat Feb 17 13:45:23 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!nntp.crl.com!newshub.cts.com!not-for-mail
From: [e-mail] (John Kolb)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 13 Feb 1996 21:19:30 GMT
Organization: CTS Network Services (CTSNET), San Diego, CA
Lines: 30
Message-ID: <4fqv92$[e-mail]>
References: <willmore.823905417@whelk>
NNTP-Posting-Host: sd-i2.cts.com
X-Newsreader: TIN [version 1.2 PL2]

David A Willmore ([e-mail]) wrote:
: It seems that every time I look for information on PLL loop filter design,
: they focus on simple implementation of the loop filter.  Is it because
: simple one or two pole filters are the ideal filters for this use or
: is there some other design constraint involved?  The filter only has to
: work in the audio range--from my understanding.  Would a brick wall, low
: pass filter of a high order be a better solution?  What if you could widen
: the passband while tuning and narrow it down once you have aquired lock?

Just offhand, I would say the varying phase shifts as you moved
across a complex filter would be very unsetting to loop dynamics.

Looking at someone's synthesizer IC the other day (National?) that
brings out a pin called QuickLock which can be used to throw a
shunting resistor in a simple lead/lag network to speed up the
lock time.


: Just a few thoughts and questions.  BTW, anyone have a good VCO design for
: 60.7 to 64.7 MHz? :)


Years ago now, I had very good luck using a capacitor at the end
of an ~ 1/4 wavelength of coax to replace the inductor in a VCO,
to get higher Q and thus lower phase noise. Use minature coax, and
just roll it up out of the way.

John Kolb   KK6IL   [e-mail]




From [e-mail] Sat Feb 17 13:45:24 1996
Path: news.epix.net!uunet!in2.uu.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!tuegate.tue.nl!news.IAEhv.nl!news
From: Rik Slingerland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 13 Feb 1996 21:30:40 GMT
Organization: Internet Access Eindhoven, the Netherlands
Lines: 12
Message-ID: <4fqvu0$[e-mail]>
References: <willmore.823905417@whelk> <4fln1c$[e-mail]>
NNTP-Posting-Host: pm1d05.iaehv.nl

It's a long time ago I did something with them,
but I seem to remember that if the phase shift at
unity gain OF THE LOOP was more than 90 degrees,
oscillation occurs. Therefore higher order filters
are used, but at the unity gain 'frequency' they must
be stopped to 1st order.

A good book on this might be:
Frequency Synthesizers, Vadim Manassewitch, John Wiley & Sons

PE1BIZ



From [e-mail] Sat Feb 17 13:45:25 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.luc.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.cig.mot.com!whelk!willmore
From: [e-mail] (David A Willmore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 14 Feb 96 20:34:30 GMT
Organization: Motorola Cellular Infrastructure Group
Lines: 43
Message-ID: <willmore.824330070@whelk>
References: <willmore.823905417@whelk> <4fqv92$[e-mail]>
NNTP-Posting-Host: whelk.cig.mot.com

[e-mail] (John Kolb) writes:

>David A Willmore ([e-mail]) wrote:
>: It seems that every time I look for information on PLL loop filter design,
>: they focus on simple implementation of the loop filter.  Is it because
>: simple one or two pole filters are the ideal filters for this use or
>: is there some other design constraint involved?  The filter only has to
>: work in the audio range--from my understanding.  Would a brick wall, low
>: pass filter of a high order be a better solution?  What if you could widen
>: the passband while tuning and narrow it down once you have aquired lock?

>Just offhand, I would say the varying phase shifts as you moved
>across a complex filter would be very unsetting to loop dynamics.

Supposedly, the filters come in an eliptic variety which, I would think,
would not suffer from this much.

>Looking at someone's synthesizer IC the other day (National?) that
>brings out a pin called QuickLock which can be used to throw a
>shunting resistor in a simple lead/lag network to speed up the
>lock time.

Hmmm, I'll have to give them a look.  This design is for personal use,
BTW.  I don't do these things for a career. :)

>: Just a few thoughts and questions.  BTW, anyone have a good VCO design for
>: 60.7 to 64.7 MHz? :)


>Years ago now, I had very good luck using a capacitor at the end
>of an ~ 1/4 wavelength of coax to replace the inductor in a VCO,
>to get higher Q and thus lower phase noise. Use minature coax, and
>just roll it up out of the way.

Hmmm, this would be even more practical as I'm thinking of going to a
mutiplied VCO which would get divided down to make the LO.

>John Kolb   KK6IL   [e-mail]

Thanks for the ideas.

Cheers,
David


From [e-mail] Sat Feb 17 13:45:26 1996
Path: news.epix.net!uunet!in2.uu.net!news.sprintlink.net!malgudi.oar.net!imci4!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.cig.mot.com!whelk!willmore
From: [e-mail] (David A Willmore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 14 Feb 96 20:26:13 GMT
Organization: Motorola Cellular Infrastructure Group
Lines: 21
Message-ID: <willmore.824329573@whelk>
References: <willmore.823905417@whelk> <4fj5uf$[e-mail]>
NNTP-Posting-Host: whelk.cig.mot.com

David Nulton <[e-mail]> writes:

>I'm not a PLL expert but have worked with some simple stuff at
>1Khz.  I believe the design of the filter will affect the capture
>and lock range of the PLL.  For example, too sharp a filter could
>easily lose lock (If I understand it right).  However I think the
>gear shifting filter idea might work just dandy.  Although
>depending on your application, there usually isn't much need for a
>really whopper filter in the PLL.

>Just my thoughts

>73s
>de KI5XW

Thanks.  My two concerns with this design are fast lock times with variable
step sizes and low phase noise once lock has been acheived.

Cheers,
David



From [e-mail] Sat Feb 17 13:45:27 1996
Path: news.epix.net!news.sprintlink.net!news.intelenet.com!unogate!mvb.saic.com!homer.alpha.net!daily-planet.execpc.com!news.sol.net!news.inc.net!news.uoregon.edu!waikato!comp.vuw.ac.nz!central.co.nz!usenet
From: [e-mail]@central.co.nz (Barry Lennox)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Poor Man's Packet
Date: 12 Feb 1996 09:34:39 GMT
Organization: Personal
Lines: 15
Message-ID: <4fn1jf$[e-mail]>
References: <4f971p$[e-mail]>
NNTP-Posting-Host: barryl.central.co.nz
X-Newsreader: WinVN 0.93.14

In article <4f971p$[e-mail]>, [e-mail] says...
>
>Looking for a project article titled "Poor Man's Packet" found in the
>August 1991 (pg. 8) of `73: Amateur Radio Today'.
>Any help in locating this would be greatly appreciated.

I have the article. I ordered the software from the author, built the PMP
system from the junkbox (purchased the IC) and it works fine.

You should be able to get the original copy of 73 from a good library.

E-Mail me if you get really stuck.

Barry Lennox



From [e-mail] Sat Feb 17 13:45:28 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bofh.mi.org!frankensun.altair.com!nntp.coast.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ae517
From: [e-mail] (Russ Renaud)
Subject: PostScript to Gerber
Message-ID: <[e-mail]>
Sender: [e-mail] (Russ Renaud)
Reply-To: [e-mail] (Russ Renaud)
Organization: The National Capital FreeNet
Date: Wed, 14 Feb 1996 20:48:30 GMT
Lines: 7


Is there any shareware utility that will convert a ppostscript file
to Gerber format (for cad/cam), or a shareware cad app that will
read a postscript and output in Gerber?

thanks



From [e-mail] Sat Feb 17 13:45:29 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!guitar.sound.net!imci3!imci5!imci4!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (ITUTec)
Newsgroups: rec.radio.amateur.homebrew
Subject: Press Release - PIC-1 Pro Pack
Date: 12 Feb 1996 00:29:48 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 42
Sender: [e-mail]
Message-ID: <4fmj8c$[e-mail]>
Reply-To: [e-mail] (ITUTec)
NNTP-Posting-Host: newsbf02.mail.aol.com

ITU Technologies is proud to introduce the new PIC-1 Pro Pack.  This new
package is geared toward serious hobbyists and engineers looking for a
high-quality PIC programmer at a low price.

The PIC-1 Pro Pack includes:
        * the PIC-1 Programmer w/software, cables and power supply (US
only)
        * the PIC-n-GO upgrade (PIC16C84 processor and data sheet)
        * 18-pin ZIF socket upgrade for PIC-1
        * 40/28 pin ZIF adapter module for PIC-1

The PIC-1 Pro Pack is _only_ $79US in kit form or $99US assembled/tested.

This package will allow you to program all of Microchip's PICs in the
mid-range family (PIC16C6x/7x/8x) with out-of-the-box support!  This
high-quality package includes everything you will need to begin
programming PIC microcontrollers today!

This is the same PIC-1 programmer you have read about in Electronic
Products, MicroComputer Journal, Electronics Now, Popular Electronics
and Nuts and Volts Magazine.

For those just starting out with PICs, we recommend our PIC-n-GO Package.
This includes our PIC-1 programmer with one PIC16C84 EEPROM-based
processor and data sheet.  This package includes all software, cables
and power supply (US only) for only $45US in kit form or $61US assembled/
tested.  The PIC-1 programmer alone is available for $39US in kit form or
$55 assembled/tested.

Please add $5 shipping in North America, $10 to all other destinations.

You may pay with VISA or MasterCard, COD (US only), money order, or your
personal check.

See our WEB PAGE for more details and other great products!
WEB URL: http://www.itutech.com

ITU TECHNOLOGIES
E-mail: [e-mail]
Phone : [phone]     9AM - 5PM Eastern
Fax   : [phone]



From [e-mail] Sat Feb 17 13:45:30 1996
Path: news.epix.net!news.sprintlink.net!news.icon.net!imci2!pull-feed.internetmci.com!imci5!imci4!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP Schematics scanned and ready!
Date: 16 Feb 1996 13:28:00 GMT
Lines: 6
Message-ID: <4g20p0$[e-mail]>
References: <4f0sru$[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

I'd love to see the QRP schematics.  Do you have parts
lists, coil winding info, etc?  I am a QRP animal, and
I enjoy building and operating homebuilt equipment.

73 / 72 de KC5NG / QRP-ARCI #8204



From [e-mail] Sat Feb 17 13:45:31 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!newsfeed.internetmci.com!howland.reston.ans.net!quagga.ru.ac.za!uct.ac.za!iafrica.com!aztec.co.za!workspc
From: [e-mail] (Workshop)
Newsgroups: rec.radio.amateur.homebrew
Subject: Shunt peaking coils
Date: 15 Feb 1996 12:18:12 GMT
Organization: Professional Computer Manufacturers
Lines: 11
Message-ID: <4g012e$[e-mail]>
NNTP-Posting-Host: workspc.pcm.co.za
X-Newsreader: News Xpress Version 1.0 Beta #3

Is there anyone out there who can give me design formulas/rules
for calculating the value of shunt peaking coils.
I have a design for an aerial amp,but the coil winding instructions
have been left out.The only info it has is that the coil is 2.5
turns.No wire gauge,diameter or length!(FAT HELP)
The design comes from the TV DXers handbook published around 1988.
Maybe someone out there has come across or built the circuit
and could help out.
Thanks
Cheers
Robin


From [e-mail] Sat Feb 17 13:45:32 1996
Path: news.epix.net!news.sprintlink.net!bison.alfred.edu!kato.theramp.net!chi-news.cic.net!newsxfer2.itd.umich.edu!agate!spool.mu.edu!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Peter L. Williamson)
Newsgroups: rec.radio.amateur.homebrew
Subject: software for mfj-1278 tnc
Date: 11 Feb 96 04:40:39 GMT
Organization: ucsd usenet gateway
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hello all,
           I amlooking for some software to use all the functions of the mfj
1278 multimode tnc.  I am sure I saw somewhere a program described that does
all the functions (but much better ) than multicom 3.1.  Unfortunately I did
not bookmark the site or program name, can you help????.
regards Peter L. Williamson VK4AWP.



From [e-mail] Sat Feb 17 13:45:33 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!news.sol.net!news.inc.net!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!po.CWRU.Edu!dxk10
From: [e-mail] (David Kazdan Md)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: 9 Feb 1996 23:39:22 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Lines: 40
Message-ID: <4fglva$[e-mail]>
References: <4emtge$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (David Kazdan Md)
NNTP-Posting-Host: christopher.ins.cwru.edu


In a previous article, [e-mail] (Mark Zenier) says:

>in <4emtge$[e-mail]>, Eliot Fenton wrote:
>: But does anyone know of a chip manufactured by Motorola, National, etc.
>: that will take left and right stereo audio outputs (from say a C.D.
>: player) and produce an RF carrier suitable for reception and demod. on any
>: stereo receiver?
>
>A Japanese company has a single chip stereo transmitter, the Rohm Ba1404.
>
>
>Unless you want to deal with a fairly quirky chip, you can get a
>preassembled stereo to RF converter at your local discount store for
>about $20 in the form of the FX Wave Fx-100.  Hanging on the pegboard in
>the audio department.  (I use one hooked to my VCR for wireless
>headphones.)  It's just LC tuned, but seems stable enough.  The main
>chip has the label sanded off.  It doesn't have enough pins to be a
>BA1404, but I suspect it is a related chip.  I hear Rohm makes a stero
>multiplexer chip without the transmitter section.  The FX wave has a
>seperate 4 transistor RF section.


Mine is labelled differently, from a Canadian manufacturer.  It is cheap
and works well.

The Ramsey FM25 is expensive and in kit form, but works _very_ well.  The
1404 has a varactor in parallel with the tank capacitor, and the Ramsey kit
uses that as the VCO in a PLL; it DIP-switch sets to a standard FM
frequency and does indeed stay there.

Any ham uses for these things?  I don't know if multiplex transmitting is
legal on the ham bands.

                        --David
--
David Kazdan, M.D., Ph.D      [e-mail]; Amateur Radio: AD8Y
Anesthesiologist,
Whitacre Department of Anesthesiology, Meridia Huron Hospital,
     East Cleveland, Ohio


From [e-mail] Sat Feb 17 13:45:34 1996
Path: news.epix.net!uunet!in1.uu.net!spool.mu.edu!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Steve Lisle)
Newsgroups: rec.radio.amateur.homebrew
Subject: test msg
Date: 14 Feb 96 15:41:42 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

just seeing if this gets to the digest ok.


From [e-mail] Sat Feb 17 13:45:35 1996
Path: news.epix.net!uunet!in2.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet
From: Jim Strohm <Jim Strohm@ausq1ak>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Use for ferite materials???
Date: 13 Feb 1996 18:28:25 GMT
Organization: Semiconductor Products Sector
Lines: 16
Message-ID: <4fql89$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 222.229.249.54
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12(Macintosh; I; PPC)
X-URL: news:[e-mail]

A pair of the ferrite cones can be used as a filter for your
phone line -- take a half a dozen turns through the core.

If you had hundreds of these cores, you might find a sculptor
who is working with "found" art who could use them.

That's all I've found you could do with yoke cores.

We already know that flyback transformer cores can be used in
some toroid applications such as filament chokes.

N6OTQ
The line for flames forms over there. Take a number- 196.
Now serving number 3.




From [e-mail] Sat Feb 17 13:45:36 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!fury.berkshire.net!news.ironhorse.com!sloth.swcp.com!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!ix.netcom.com!netnews
From: Steven B Reed <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Use for ferite materials???
Date: Mon, 12 Feb 1996 08:20:26 -0500
Organization: Netcom
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ix-day-oh1-08.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Mon Feb 12  5:22:45 AM PST 1996
X-Mailer: Mozilla 2.0b6a (Win95; I)

Hello all,
        I work at a large CRT manufacturer, and they throw away a large
quanity of defection yokes.  I have saved a few from the landfill,
(mostly for the enameled copper wire), and have discovered what appears
to be a large cone of ferite looking material.  I know that this "stuff"
can be used to make chokes and the like.  My question is,  can these
half cone shapes be used for anything usefull?  Now that I have them
home I would rather do something with them besides just pitching them in
MY trash.

Any and all help is appreciated
73
--
Steven Reed  KB8STB


From [e-mail] Sat Feb 17 13:45:36 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!spool.mu.edu!noc.nyx.net!nyx.cs.du.edu!not-for-mail
From: [e-mail] (Thomas Mahanna)
Newsgroups: rec.radio.amateur.homebrew
Subject: Voice Command Chip??
Date: 15 Feb 1996 23:48:38 -0700
Organization: Nyx.net, free public access to the Internet
Lines: 39
Message-ID: <4g19c6$[e-mail]>
NNTP-Posting-Host: nyx.nyx.net
X-Newsreader: TIN [version 1.2 PL2]



Hi:

        Does anyone remember a VCP-200 or whatever chip that used to be

sold a Radio Crap?? It allowed you to give voice commands like:



        1. Stop

        2. Left

        3. Right



        etc...



It was speaker independent and cost about $20. Are these available

anywhere else? Is there a cheaper/better alternative?



THANKS!



-Tom



please reply to : [e-mail]




From [e-mail] Sat Feb 17 13:45:37 1996
Path: news.epix.net!news.sprintlink.net!itnews.sc.intel.com!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.midplains.net!gw2.att.com!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail](Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: W1FB's univ. dc rx
Date: 11 Feb 1996 15:12:32 GMT
Organization: Netcom
Lines: 13
Message-ID: <4fl110$[e-mail]>
References: <4f971p$[e-mail]>
NNTP-Posting-Host: ix-pon-mi3-11.ix.netcom.com
X-NETCOM-Date: Sun Feb 11  7:12:32 AM PST 1996


Has anyone build the W1FB Universal RX from the W1FB QRP Notebook?
I am halfway through putting parts on the board and noticed that there
is no value for C3. ( Schem is on page 78)

C3 appears to just couple the signal but I dont know if its part of the
tuned input or not. And not well enough versed to know what a good
value would be.

Any comments or success storys related to this schematic are
appreciated.

Tim, ka8ddz


From [e-mail] Sat Feb 17 13:45:39 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!psgrain!nntp.teleport.com!ip-pdx03-06
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted Schematics for TEKTRONIX 2215A SCOPE
Date: Wed, 14 Feb 96 09:53:50 GMT
Organization: EZNEC Antenna Software
Lines: 19
Message-ID: <4fsbdt$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-pdx03-06.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <[e-mail]>,
   [e-mail] (Peter L. Williamson) wrote:
>Can any reader help me with some schematics/scope trace for the TEK 2215A.
>Mine has just developed a fault where it will not trigger on CH. 2 and I
am
>keen to repair it  (AGAIN! SIGH! I think I could take this one apart in my
>sleep----)
>Tnx Peter VK4AWP.

Manuals for most older Tektronix scopes can be obtained from

        Deane Kidd, W7TYR
        2727 SW Ladd Hill Road
        Sherwood, OR 29140 USA
        ([phone]

You might still be able to get a manual for the 2215A from Tektronix.

Roy Lewallen, W7EL


From [e-mail] Sat Feb 17 13:45:40 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!solaris.cc.vt.edu!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB 6,000 watt linear amp 75 meters
Date: 16 Feb 1996 18:53:10 GMT
Organization: Virginia Tech, Blacksburg, Virginia
Lines: 2
Message-ID: <4g2jqm$[e-mail]>
NNTP-Posting-Host: jimo.mine.vt.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

        Please forward info.



From [e-mail] Sat Feb 17 13:45:42 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JRosariojr)
Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap
Subject: Re: WTB:5KW AM Transmitter
Date: 14 Feb 1996 03:49:49 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 1
Sender: [e-mail]
Message-ID: <4fs7nd$[e-mail]>
References: <4fn47d$[e-mail]>
Reply-To: [e-mail] (JRosariojr)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: news.epix.net aus.radio.amateur.misc:446 aus.radio.amateur.wicen:71 rec.radio.amateur.antenna:19099 rec.radio.amateur.digital.misc:14179 rec.radio.amateur.equipment:24980 rec.radio.amateur.homebrew:13359 rec.radio.amateur.misc:98120 rec.radio.scanner:45613 rec.radio.swap:57615

good luck


From [e-mail] Wed Feb 21 16:05:48 1996
Subject: ### KISS on a Baycom?
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Edwin Teh)
Date: Mon, 19 Feb 1996 18:37:47
Message-ID: <[e-mail]>

Hello people,

    I've recently taken an interest in working tcp/ip over
    packet, and it seems a little difficult to do that
    with my homebrewed baycom-style packet modem.

    Anyway, I've been considered porting over to a varient
    of unix, and it seems I would need a TNC which supports
    KISS (that'd mean my baycom would have to be scrapped).

    Since cost is a rather high consideration for me, I'd like
    to know if it's possible to homebrew a KISS interface for
    a baycom-style packet modem? The idea doesn't seem impossible,
    could someone point me in the right direction to work on
    such a project?

73 de 9V1ZY

--
[e-mail]              -[ Standard Disclaimers Apply ]-

          Now Faith is a substance of things hoped for,
           the evidence of things not seen. [Heb 11:1]

             As Email can be altered electronically,
     the integrity of this communication is not guaranteed.





From [e-mail] Wed Feb 21 16:05:49 1996
Subject: Re: ### KISS on a Baycom?
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Edwin Teh)
Date: Wed, 21 Feb 1996 09:07:26
References: <[e-mail]> <[e-mail]>
Message-ID: <[e-mail]>

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

> There are a number of KISS drivers around for the Baycom - style modem.

> TFPCX
> TFX
> probably some more that I dont recall off the top of my head.

> For NOS use AX25.COM from Pawel Jalocha.

Thanks for your helpful infomation - but I'm to understand baycom
style modems don't work on unix(and it's varients) based systems
due to the way they operate.

I haven't seen any KISS drivers for the Baycom for unix.

73 de 9V1ZY

--
[e-mail]              -[ Standard Disclaimers Apply ]-

          Now Faith is a substance of things hoped for,
           the evidence of things not seen. [Heb 11:1]

             As Email can be altered electronically,
     the integrity of this communication is not guaranteed.





From [e-mail] Wed Feb 21 16:05:51 1996
From: [e-mail] (Ed Bathgate)
Newsgroups: rec.radio.amateur.homebrew
Subject: 'Memory keyer - Public domain code'
Date: 15 Feb 1996 11:56:27 -0500
Message-ID: <4fvojr$[e-mail]>



Does anybody know of a microcontroller based keyer with public domain
software?  I have FTP'd, and searched, and archied, and webbed, and havent
found one yet.  Perhaps it doesent exist.

I recall a while back there were a lot of posts complaining about a cpu
Super Keyer construction article published recently in QST, not having source
code.  From what I understand, the only way to build this keyer was with his
preprogrammed $50 chip.

Well... I pose an idea...

Pool a list of desired features, get a group of geeks together via internet,
and group write and post the source code, and design and build a public
domain keyer... and then make a group article for QST.

Sound plausable, or am I asking for a democracy in the land of chaos?

Perhaps we could have code for several types of Microcontrollers.

My personal MPU of choice is the motorola 68hc11, why is that you ask?
Low cost - under $20 bucks each.  (I already have some)
EEPROM 512 bytes, ram 256 bytes, on board serial and parallel and A>D ports.
It can be programmed via its own serial port WITHOUT A SPECIAL PROGRAMMER!
The motorola compiler software is available via bbs and internet to run on a P
C.
I like many others learned 6800 on a heathkit trainer 10+ years ago and am
  quite comfortable with its instruction set.
The design could be easily be ported to 6800, 68x711,811 or whatever.
Perhaps there is some guru who could port the final design over to RISC for PI
C.

Features/functions...

Iambic operation, single or dual paddle.
Single striaght key operation. (How?  input requested)
Adjustable weight, speed and spacing. (Pots to analog input channels? input
  requested)
Multiple memorys - push button selection.
  (several discrete buttons, or up/down buttons and status leds? input request
ed)
TX relay control for older tube type rigs that shorten first character while
  the tx/rx relay closes.  Prevents relay from opening until EOM or SK is sent
.
  Perhaps an SK button?

Now is your chance to have some input into a new keyer design, one that you
can really build and program yourself!

Send your thoughts to [e-mail]

73

Ed N3SDO



From [e-mail] Wed Feb 21 16:05:52 1996
From: Gary Davidson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: (no subject)
Date: 14 Feb 1996 23:58:09 GMT
Message-ID: <4ftsuh$[e-mail]>
References: <4ft621$[e-mail]>

NEVER MIND, I was able to locate exact replacement diodes, all is well!

--
Gary... KJ6Q... I am the NRA  | "Only in AMERICA, Veterans in shacks,
============================  | a DRAFT DODGER in the White House...
"Did you come here to *LEARN*,|======================================
or to look around, make rude  | "It's *EASY* to be a liberal, it's
noises & provide proof our    | OTHER people's money you are giving
educational system stinks?"   | away! (or living off of!)




From [e-mail] Wed Feb 21 16:05:54 1996
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <[e-mail]>
Date: Fri, 16 Feb 1996 16:55:00 -0500
Subject: Re: 813 Xmtr for 160M
Message-ID: <[e-mail]>

From: [e-mail]
"mail sometimes bounces here, please resend if needed!"

I once had an ART-13 - got it free at a hamfest, built a 28V DC supply
for the autotune and put it on the air! Had a ball with it!

FAIR RADIO is listed in my file MEGALIST.TXT aka MEGALIST.ZIP
available as follows:

Updated copies downloadable from BBSes at:
[phone], [phone], [phone],  [phone]
[phone], [phone], [phone]

FTP site is at ftp.Lehigh.EDU.  Login as anonymous, and use your
e-mail address as the password.
FTP:  ftp://ftp.lehigh.edu/pub/listserv/qrp-l/misc/megalist.txt
WWW: http://qrp.cc.nd.edu/QRP-L/index.html
WWW: http://www.nd.edu/~shideg/

megalist.txt
manuals.txt
dealers.txt
tubes.txt
xtals.txt
========

LD>> Fair Radio in Lima Ohio has the ART-13 available in surplus again for $15
0
LD>It covers 2-18 Mhz
LD>> (and is easily re-worked for 160 thru 10 meters) and uses an 813 modulate
d
LD>with a pair of
LD>> 811's. You might have more fun rebuilding the ART if you just want to run
LD>the 813's!

LD>Hey, I had one of these things many years ago.  Watching the autotune
LD>operate is more fun than a barrel of monkeys.  What's the address for
LD>Fair Radio?

LD>Larry                                 *************************

The Evolution of Contemporary Thought:

---->   McHale's Navy ->
->  Mikhail Gorbachev ->
---------->   Al Gore ->
------->   Gore Vidal ->
---->   Vidal Sassoon........

A natural progression!

---
 ■ SLMR 2.1a ■


From [e-mail] Wed Feb 21 16:05:55 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 813 Xmtr for 160M
Message-ID: <[e-mail]>
Date: 18 Feb 96 22:23:59 -0500

Check the ARRL Operating Manual for the 160M windows that are used in
different parts of the world.  I really made me appreciate OUR frequency
allocations!!!


From [e-mail] Wed Feb 21 16:05:57 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
From: [e-mail] (Donald I. Baker)
Subject: Re: 82 Repeater in Kansas City, TXxID-1
Message-ID: <[e-mail]>
Date: Sun, 18 Feb 1996 02:18:32 GMT
References: <4efpb3$[e-mail]> <4ete1q$[e-mail]> <[e-mail]> <[e-mail]> <4fgm3h$[e-mail]> <[e-mail]> <4g6ard$[e-mail]>

In article <4g6ard$[e-mail]> [e-mail] () writes:
>From: [e-mail] ()
>Subject: Re: 82 Repeater in Kansas City, TXxID-1
>Date: 18 Feb 1996 04:44:29 GMT

>I WRITE:

>        Of course if you are a smart jammer like myself. You simply
>construct a simple automatic rf sensing switch box. Simply made from rip
>off shack parts. What it does is for the first 100mills on the tx my rf
>output is directed into a small 10 watt 50 ohm dumy load, after the cap
>charges up it causes the relay to swithc me over to my antenna.
>VAWALLLLAAAAA   NO fingerprint. Of course no fingerprint is a fingerprint.
>but now i cant give out all my secrets can I?
>jeff aa7up
>PDX, or
of course you could just mod the radio so that the final is "up" all the time
and just switch the link between the driver and final...........


Donald I. Baker
Reville Engineering Services
4619 Schenley Road
Baltimore, MD 21210-2525
[phone]
Custon Harsh Environment
Computers and RF Products
"Where no PC has gone before..."


From [e-mail] Wed Feb 21 16:05:59 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: ? transverter 10m-70cm
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4fsn2a$[e-mail]>
Date: Thu, 15 Feb 1996 17:42:19 GMT

In article <4fsn2a$[e-mail]> [e-mail]
i-erlangen.de (Hans Reiser (CIP 95)) writes:
>I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and
>i'm looking for any information about this. Any hints how to do
>so would be appreciated, as well as sources for schematics, literatur,
>etc, and personal experiences with this.
>One additional intended use of my project is in digital communication,
>and therefor I'm especially interested in the capability of
>full-duplex operation (simultanious TX and RX), and fast (electronic)
>TX/RX switching. And of course I'm interested also in
>low-budget-designs... :-)

Get a copy of the RSGB VHF DX book. There are a number of good
transverter designs in there as well as good material on designing
your own.

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


From [e-mail] Wed Feb 21 16:06:00 1996
From: [e-mail] (Hans Reiser (CIP 95))
Newsgroups: rec.radio.amateur.homebrew
Subject: ? transverter 10m-70cm
Date: 14 Feb 1996 13:11:38 GMT
Message-ID: <4fsn2a$[e-mail]>
Summary: Looking for information about building an 10m-70cm transverter

Hello!

I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and
i'm looking for any information about this. Any hints how to do
so would be appreciated, as well as sources for schematics, literatur,
etc, and personal experiences with this.
One additional intended use of my project is in digital communication,
and therefor I'm especially interested in the capability of
full-duplex operation (simultanious TX and RX), and fast (electronic)
TX/RX switching. And of course I'm interested also in
low-budget-designs... :-)

Thanks for your replies.

        Hansi.

-----
Hansi Reiser, dl9rdz         <[e-mail]>
                             WWW-URL:   <http://home.pages.de/~dl9rdz>
                             packet radio: <dl9rdz@db0wgs.#bay.deu.eu>


From [e-mail] Wed Feb 21 16:06:01 1996
From: [e-mail] (RStapestry)
Newsgroups: rec.radio.amateur.homebrew
Subject: ANCIENT W.M Welch Oscilliscope, Info needed!!!
Date: 15 Feb 1996 19:57:12 -0500
Message-ID: <4g0kp8$[e-mail]>
Reply-To: [e-mail] (RStapestry)

ANCIENT W.M Welch Oscilliscope, Info needed!!!

Hello.

I've been posting q's about GPS, haven't found too much info.

HOWEVER!!!
I recently acquired a Cathode Ray Oscilliscope from my Physics teacher,
with a little coaxing, and I have no clue how to make it run again. It has
vacuum tubes and a huge CRT projector. It's a work of art, however it
looks like it was soldered together by a two year old.

Technical information.

It's a W.M. Welch CROscilliscope, 115 volts, 50-60 cycles, 35 watts.
CRT projector is model... Phillips  JAN-CNY-5cpl
Vacuum tubes:
RCA 2x2-879
RCA 6x4
CBS 6CG7
Sylvania 6AU6  (two of these)

There are two huge capacitors
Solar CP70E   1FH504K
1500WVDC    .5 mFd

Asst. large resistors.

Ancient transformers.

My best estimates are that it's 40's vintage.
I want to get this thing to work.
If anyone knows of technical data, and replacement parts for one of these,
Please let me know.

Thanx, Dave.


From [e-mail] Wed Feb 21 16:06:02 1996
From: Roland S Geter PhD <[e-mail]>
Newsgroups: rec.radio.shortwave,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.swap
Subject: Re: Broadcasting Radio Station Database for you......
Date: 17 Feb 1996 07:47:44 GMT
Message-ID: <4g4170$[e-mail]>
References: <4fme8u$[e-mail]>
To: [e-mail]

Hi Chuck,

Let's try to get the database over here on this provider, OK?

Thanks
Roland S Geter PhD
[e-mail]



From [e-mail] Wed Feb 21 16:06:03 1996
From: [e-mail] (JohnsonHE)
Newsgroups: rec.radio.amateur.homebrew
Subject: crystal lattice filters
Date: 19 Feb 1996 17:48:58 -0500
Message-ID: <4gauoq$[e-mail]>
Reply-To: [e-mail] (JohnsonHE)

Looking to purchase several of the old McCoy 9 MHz crystal lattice filters
.
These carried the nickname Silver sentinal and Golden Guardian.
SSB bandwidths only.
Please direct response to e-mail address

[e-mail]


From [e-mail] Wed Feb 21 16:06:04 1996
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Driving a CCD/ Building a CCD camera
Date: Sat, 17 Feb 1996 22:30:42 LOCAL
Message-ID: <[e-mail]>
References: <4g5sg9$[e-mail]>

In article <4g5sg9$[e-mail]> [e-mail] (TheBots) writes
:
>From: [e-mail] (TheBots)
>Subject: Driving a CCD/ Building a CCD camera
>Date: 17 Feb 1996 19:39:37 -0500

>How might I go about constructing a CCD camera out of components? Can
>anyone direct me to schematics?

Buy "The CCD Camera Cookbook" by Veikko Kanto, KB7UCZ, and John Munger, N7WBQ.
The publisher is Willmann-Bell, Box 35025, Richmond, VA 23235, [phone].

This will take you through theory to construction and operation of a CCD
camera. The book includes software for trouble shooting and image processing.
I'm not sure of the cost, but I believe it's under $20.

Have fun.

73, Wes -- N7WS



From [e-mail] Wed Feb 21 16:06:06 1996
From: [e-mail] (John Kolb)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: DS-1A (DC-DC converter for Kenwood) question
Date: 19 Feb 1996 21:27:31 GMT
Message-ID: <4gaq03$[e-mail]>
References: <4ft09j$[e-mail]> <[e-mail]>

charles copeland ([e-mail]) wrote:
: In article <4ft09j$[e-mail]>,
: Ken Edwards <[e-mail]> wrote:
: >I have a Kenwood TS-820S that I would like to run off battery in
: >cases of emergency.  And as a (good ?) homebrew project, I thought
: >I could emulate the offering from the manufacturer.  Problem is,
: >the information in the back of the service manual is sufficently
: >ambigeous enough that I have a few questions.
: >
: >Is the transformer shown part of the DC-DC converter kit, or is
: >it the one already in the radio, with the barrier strip that already
: >has the matching color coded wires ?
: >
: >The drawing shows the same connector as used for AC input, but wired
: >for DC, then another "power connector" thet does not appear to match
: >the previous which interrconnects with the barrier strip.  How exactly
: >is the power (DC) connected into the system ?


I've looked into this for my TS-520SE.  The DC version TS-520S
(or did I reverse the two names?) has an added heatsink on the back
with two switching transistors, wired to a terminal strip in the
rig. The power transformer is different, however. It has an added
winding to serve as a low voltage primary, switched by the transistors.
To convert to 12V DC in you would have to change the transformer
and add the heat sink/transistors on the back.

John Kolb  KK6IL



From [e-mail] Wed Feb 21 16:06:07 1996
From: [e-mail] (PDRUNEN)
Newsgroups: rec.radio.amateur.homebrew
Subject: DTMF Program/Schematics
Date: 18 Feb 1996 02:18:22 -0500
Message-ID: <4g6jru$[e-mail]>
Reply-To: [e-mail] (PDRUNEN)

Hello everyone,

I have a DTMF program and the associated schematic free to anyone
interested.  The hardware is a simple two chip circuit which
connects into your existing Parallel port, the port where the printer
is connected.

The schematics are in a GIF format so you need a GIF viewer.

If you want it, e-mail me at [e-mail] and I will send it
via the Internet!

Paul


From [e-mail] Wed Feb 21 16:06:08 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ferric Chloride Question
Date: 15 Feb 1996 18:01:37 GMT
Distribution: world
Message-ID: <4fvse1$[e-mail]>
References: <4fthmc$[e-mail]>

John Heck ([e-mail]) wrote:
: In article [e-mail], "Steven A. Bailey" <[e-mail]>
 writes:
: >I am wondering the ramifications of dumping some
: >dilluted ferric chloride out in my yard (used for
: >PCB etching).  Seems this is a very weak acid...even
: >when at full strength.  Any ideas are welcome.

: I believe that if you dilute it well you may spray it on your yard and it wi
ll do a
: nice job of greening it up(in warm weather, of course). Ferric cloride is ac
idic
: but not a strongly so as, say hydrogen cloride(muriatic acid), since iron do
es not
: hold on to its outer electrons as well(being large) as hydrogen, and so ioni
zes much
: more easily. Iron plays an important role in the manufacture of clorophyll a
nd this,
: of course makes the grass green.

Two comments:  if it's spent, after etching copper-clad board, the copper
sure won't help the plant life much.  And if it's not used, the Fe+3 is a
fairly strong oxidant (etches copper after all), and may not be as good
for plants as Fe+2.

Second, you can't dissolve very much ferric ion in neutral water!  The
solubility product of ferric hydroxide is something like 10^-36, so if you
want one molar ferric ion, plan on getting the hydroxide down to about
10^-12, which means the hydrogen ion must be 10^-2, or pH=2 or less.  In
other words, to get ferric chloride to dissolve appreciably in water, you
must make the water acidic.  Otherwise you get ferric hydroxide
precipitate, brown "glop".  In fact, by the act of precipitating, it
leaves behind hydrogen ion, so whether you add acid to get everything to
dissolve, or just remove hydroxide by letting Fe(OH)3 precipitate, you've
made hydrochloric acid solution.  It's not terribly strong, but do treat
it with some respect.

--
Cheers,
Tom
[e-mail]


From [e-mail] Wed Feb 21 16:06:09 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Ferric Chloride Question
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4freng$[e-mail]>
Date: Thu, 15 Feb 1996 17:06:17 GMT

In article <4freng$[e-mail]> "Steven A. Bailey" <bailey@skipjac
k.net> writes:
>I am wondering the ramifications of dumping some
>dilluted ferric chloride out in my yard (used for
>PCB etching).  Seems this is a very weak acid...even
>when at full strength.  Any ideas are welcome.

Have your local agricultural extension agent send a
soil sample off to your land grant university. That'll
tell you how iron deficient your soil is, and how much
ferric chloride to apply per acre. If you grow tomatos,
a bit of ferric chloride on the root ball will prevent
blossom end rot. In other words, use of this chemical
for agricultural purposes is common, so I wouldn't
worry about putting it on the yard. Dilute and spray,
don't dump it in one spot.

Note however, if this is *spent* etching solution,
avoid using it on agricultural crops. Cupric chloride
is toxic. Dispose as a hazardous waste.

Gary

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


From [e-mail] Wed Feb 21 16:06:10 1996
From: [e-mail] (Josh Heide, KD6KML)
Newsgroups: rec.radio.amateur.homebrew
Subject: For Sale: general Electric Manuals, and some Motorola
Date: 18 Feb 1996 21:35:55 GMT
Message-ID: <4g863r$[e-mail]>

I have General Electric service manuals from the late 50's to the late 80'
for sale. I also have some Motorola, also. I will sell complete manuals or
just the sections you need. Please contact me via e-mail for prices and
availibility. Also, if you would, please include a phone number and the best
time to reach you.
                                JOSH  KD6KML
                                [e-mail]



From [e-mail] Wed Feb 21 16:06:11 1996
From: Robert Rolfness <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: Jenning Vacuum Caps
Date: Sun, 18 Feb 1996 14:40:22 -0800
Message-ID: <Pine.BSD/[e-mail]>

I have for sale two models of Jennings Vacuum Variable Capacitors for $60
each.  These are type UCS-375, 375 pfd. at 14,000 volt and type UCS-750,
750 pfd. at 14,000 volt.

73, Bob W7VZX


From [e-mail] Wed Feb 21 16:06:12 1996
From: [e-mail] (GreenDS01)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: K-Band Radar unit
Date: 19 Feb 1996 23:33:08 -0500
Message-ID: <4gbiu4$[e-mail]>
Reply-To: [e-mail] (GreenDS01)

For sale: KR-11 Kustom Signals mobile radar unit. Just calibrated in 95.
can be used stationary or moving. Auto or manual modes with overspeed
indicator. Both target and patrol speed windows. Comes with case. Asking
$400.00. includes shipping.


From [e-mail] Wed Feb 21 16:06:12 1996
From: Mike Obermeier <[e-mail]>
Newsgroups: rec.radio.scanner,alt.radio.scanner,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: FT-8500 Need Mods
Date: 15 Feb 1996 04:56:45 GMT
Message-ID: <4fueef$[e-mail]>
References: <4fov69$[e-mail]>
To: [e-mail]

The mod is easy.  This will give you 137-174mhz and 410-470mhz Tx/Rx.

1. disconnect power and antenna (like, you would'nt of done it already.)
2. open up the case by removing the screws and gently removing the cover and
   unpluging the speaker.
3. locate and CUT the GREEN WIRE on the CONTROL BOARD ( the vertical board beh
ind
   the control panel.
4. reassemble the radio.
5. RESET THE MICROPROCESSOR (so much for the memory!)

   (press and hold [D/M] & [REV] & [ENT] & turn the power on (got enough finge
rs?).

   (turn off the radio).

   (press and hold [SCAN] & [HOME] & turn on the radio (extended RX mod).


Tha, Tha, Tha, That's All Folks!



From [e-mail] Wed Feb 21 16:06:13 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Heathkit Tubes
Date: Mon, 19 Feb 96 09:22:14 PDT
Message-ID: <[e-mail]>
References: <4g6cu4$[e-mail]>


In article <4g6cu4$[e-mail]>, <[e-mail]> writes:

> I am trying to keep my very old Heathkit HW101 on the air. But am
> having trouble sourcing 6HS6 RF amplifier tubes. I have tried many
> sources of tubes, but so far without success. If there is anyone out
> there with some new tubes to sell me, please contact me.
> [e-mail]
> 73s Roger ZL2RX
>
Hi Roger, I just purchased a couple of those from

International Components Corp
105 Maxess Road
Melville, NY 11747
[phone]

they cost $4.60 each.

I would also expect Antique Electronics Supply to have them

Antique Electronic Supply
6221 South Maple Ave
Tempe, AZ 85253
[phone]

73.....Jay



From [e-mail] Wed Feb 21 16:06:14 1996
From: [e-mail] (Roger Wincer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Heathkit Tubes
Date: 18 Feb 1996 05:20:04 GMT
Message-ID: <4g6cu4$[e-mail]>

I am trying to keep my very old Heathkit HW101 on the air. But am having
trouble sourcing 6HS6 RF amplifier tubes. I have tried many sources of
tubes, but so far without success. If there is anyone out there with some
new tubes to sell me, please contact me. [e-mail]
73s Roger ZL2RX


From [e-mail] Wed Feb 21 16:06:16 1996
From: [e-mail] (Stephen Dunifer)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design
Subject: Re: Help design coil for coupling 2 amplifiers
Date: 12 Feb 1996 20:50:54 -0800
Message-ID: <4fp5be$[e-mail]>
References: <4fkhdu$[e-mail]> <[e-mail]>

Gary Coffman ([e-mail]) wrote:
: In article <4fkhdu$[e-mail]> [e-mail] writes:
: >I would like to add the power of two identical amplifiers in 80-120MHz
: >range with 300W each.
: >
: >I don't know how.
: >
: >I believe that you have to apply signal to each amplifier (invert one
: >signal like LF amplifier ?) adapting impedance (50 ohms -> 50 + 50
: >ohms). For output add power with impedance matching.

: What you need is called a Wilkinson power splitter/combiner. This
: will divide the drive power equally between the amplifiers, and
: combine their output powers. Phase is maintained identical through
: both paths, except for the differences in phase internal to the two
: amplifiers. That can be compensated by using an adjustable phase
: shifting network at the input of one of the amplifiers, IE a line
: stretcher or the like, and adjusting to null reject power. You
: may also need to be able to control the gain of one of the amplifiers
: so that you can exactly match amplitude response too, again adjusting
: to null reject power.

: Wilkinson networks are easy to build for a specific frequency. In
: your range they would just be lengths of coax and a reject load
: resistor. To cover the entire 80-120 MHz spread without retuning
: would be more difficult. See any RF handbook for details of building
: Wilkinson splitters and combiners.

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


Here are the dimensions for the Wilkinson Hybrid for 88-108 Mhz.  Its
center frequency is 97.49 Mhz.  You will need two lengths of PTFE
(Teflon) 75 ohm coaxial cable suitable for the power level being used.
Do not use anything other PTFE cable.  The length is 54.4 centimeters.
connect in a V configuration.  For the splitter to drive the two amps,
at one end of the cables conncect the two center conductors together and
the shieldst to ground, this is your input.  At the other end of the two
cable are your two output ports to the two amps.  Shields are connected
to ground with the two center conductor becoming the two output ports.  A
100 ohm non-inductive resistor is connected between the two output
ports.  It has to have a dissipation equal to 1/2 of the applied power.
For the combiner use the above configuration but the output ports become
the input ports for the two amps and the input port becomes the output
port.  You will need a non-inductive resistor with a 150 watt capability,
these are made especially for RF, contact Richardson Electronics for them.

Stephen Dunifer



From [e-mail] Wed Feb 21 16:06:18 1996
From: [e-mail] (Nan Gwa)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help design coil for coupling 2 amplifiers
Date: 16 Feb 1996 11:18:12 -0500
Message-ID: <4g2ao4$[e-mail]>
References: <4g20kf$[e-mail]>

In article <4g20kf$[e-mail]>, [e-mail] writes:

>
> Hi everybody
>
>Thanks a lot for documented answers.
>
>In order I learn something, is there a pratical book a pointer on the
>net where I can get more informations about Wilkinson splitter ?
>
>Regards
>
>
>Have
>a nice                    [e-mail]
>Day
>
>

You might want to get the book "Radio Frequency Transistors, Principles
and Practical Applications" by Norm Dye and Helge Granberg of Motorola.
Chapter 11, Power Splitting And Combining, may prove useful.  The book
is published by Butterworth-Heineman, 80 Montvale Avenue, Stoneham MA
USA.  Closer to home, you might try Linacre House, Jordan Hill, Oxford OX2
 8DP, United Kingdom.  The ISBN number is 0-7506-9059-3.  (Listed at
$49.95 U.S.)

Tom Donaly  KA6RUH


From [e-mail] Wed Feb 21 16:06:19 1996
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help:Low Power AM Broadcast Transmitter
Date: 16 Feb 1996 20:27:40 -0500
Message-ID: <4g3auc$[e-mail]>
Reply-To: [e-mail] (PFZouave)

Is anyone familiar with the low-power AM broadcast transmitter(s) used by
Airports, DMV's real estate agents, or drive-in theatres  to broadcast
local site-specific information to  car radios?

I know, for example, that some real estate outfit puts 'em in houses for
sale, and you can hear the whole lowdown on the house by tuning in on your
car radio. Some airports do the same thing to give local information on
parking and rental cars.

Is some sort of special license required? Who makes the hardware? Is it
expensive? Any guidance or direction would be appreciated. Please email,
though, my newsreader is less than reliable.
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Wed Feb 21 16:06:20 1996
From: Peter Shintani <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: How to make a simple Hi-Q loop
Date: 20 Feb 1996 00:24:35 GMT
Message-ID: <4gb4c3$[e-mail]>

Hi:
        I decided to throw away some efficiency for the sake of simplicity.
Most HF hi-Q loop antenna are made in the shape of an octagon since
this approximates a circle quite well. However, there are many 45
degree elbow joints which can cause the resistance to increase and thus
reduce efficiency. Furthermore the use of a trombone capacitor for
tuning is "neat" but is places hardware inside the loop and is difficult to
align for smooth operation.
        I designed and built a square loop. Cut a 10 foot piece of 3/4" copper
pipe into four equal lengths. Use two 90 degree elbows to join three of the
pieces into a square. Attach a "T" fitting to the unattached open ends. Take t
he
remaining fourth piece of pipe,  cut about an inch off of it, and then cut it
in half, so that
it is about  1.25 ft long.
There are   plastic pipe inline joint meant for 1/2" ID
plastic pipe. 1/2' plastic pipe OD is very close to the OD of 3/4"
copper pipe. Ream the inside ID out so that it makes
a tight friction fit over the 3/4" copper pipe piece that is about 1.25 ft lon
g.
Slip the plastic joint over one of the 1.25 ft long piece. Fit a 1.25 ft piece
into a "T" fitting, and do the similar to the other side. Finally, tightend th
e
plastic joint to make a rigid square. No alignment problems.
Sweat solder the T fittings and 90 degree elbows. Make sure to push the plasti
c joint
away from the side being soldered, it might be deformed from the heat of solde
ring.

Buy and cut a +2.5 ft length of 1/2" pipe
and solder some nuts into the ends, cover with heat shrink tubing. Slide
the 1/2" heat shrink covered pipe into the loop through the "T" fittings to
make a variable capacitor. Use a threaded rod to move the 1/2" pipe with a low
rpm motor.

A  gamma match is used to match the coax to the loop, it should be centered op
posite
the plastic joint, and it's lenth should be about 1/4 the length of the main l
oop.
I used a ferrite bead balun but I haven't confirmed if it hurts or helps. The
piece of
RG-58, I had already had 70 beads on it from a previous project.


As is the antenna tunes from 10~30 MHz. If a vacum variable is used place of t
he
coaxial capacitor, the distributed capacitance affect is reduced so with a 5~2
00pF
unit, the tunning range is from 6.8~30 MHz.

Good luck and I welcome all comments.

Peter




From [e-mail] Wed Feb 21 16:06:21 1996
From: William Vaughn <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Ignition noise reduction
Date: 18 Feb 1996 01:35:18 GMT
Message-ID: <4g5vom$[e-mail]>
References: <4g0j7q$[e-mail]> <[e-mail]>

Paulc,
You did not mention the age or type of vehicle. These are important
factors since different models manifest there noise in different ways.
One of the biggest problems in vehicles and boats are the alternators. A
good preventitive maintenance item is to take your vehicle to an
electrical shop and have them rebuild it. If that doesn't work then you
might need an alternator filter. The marine types work best don't waste
your money on the radio shack units. Install the filter as close to the
output of the alternator as possible. The caps across all small motors
and the bonding of body panels works good too.



From [e-mail] Wed Feb 21 16:06:22 1996
From: "Gary P. Fiber" <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Ignition noise reduction
Date: Sat, 17 Feb 1996 09:52:58 -0800
Message-ID: <[e-mail]>
References: <4g0j7q$[e-mail]>

Paul A. Cianciolo wrote:
>
> Hello all
>
> Has anyone ever done any work to quiet down the ignition system (spark
> impulse noise) in a gasoline powered vehicle?? I wonder if one could
> use large ferrite beads to choke off the spectrum of the spark from
> radiating off the wire at the frequencies of interest. 1 mhz and
> above? I have done a lot of grounding , and am using resistor plugs
> and wires..  Are there any shielded wire kits out there?
>
> PaulC
> "Noisy in Connecticut"

I bonded my entire vehicle a few years back. The interference from ignition
dropped from S-9 to S-2.  Follow thw suggestions in the Radio Amateurs
Handbook for mobile installiations.  Most police vehicles use the same type
of body panel bonding where all of the panels are connected with braid.  it
does work quite well.  Also you might want to install some 0.01 uf disc
ceramic caps across the heater motor leads and wiper motor leads. This helped
quiet them down too.

Gary


From [e-mail] Wed Feb 21 16:06:23 1996
From: [e-mail] (Paul A. Cianciolo)
Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Ignition noise reduction
Date: Thu, 15 Feb 1996 14:10:13 GMT
Message-ID: <4g0j7q$[e-mail]>

Hello all

Has anyone ever done any work to quiet down the ignition system (spark
impulse noise) in a gasoline powered vehicle?? I wonder if one could
use large ferrite beads to choke off the spectrum of the spark from
radiating off the wire at the frequencies of interest. 1 mhz and
above? I have done a lot of grounding , and am using resistor plugs
and wires..  Are there any shielded wire kits out there?

PaulC
"Noisy in Connecticut"




From [e-mail] Wed Feb 21 16:06:24 1996
From: Siegfried Rambaum <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Ignition noise reduction
Date: Wed, 21 Feb 1996 13:16:06 -0500
Message-ID: <[e-mail]>
References: <4g0j7q$[e-mail]>

In our county, I have seen some stickers "NEED HELP - CALL YOUR SHERIFF".
This might seem a bit farfetched for your problem, but think of it. Those
guys drive in cars, and they are radio equipped. Just call your local
office and ask your way through to the guy in charge for maintaining the
cars. That guy should know all the tricks about grounding. And chances
are, it might be a ham, too :)

At least, it wont hurt to try it that way.


On Thu, 15 Feb 1996, Paul A. Cianciolo wrote:

> Hello all
>
> Has anyone ever done any work to quiet down the ignition system (spark
> impulse noise) in a gasoline powered vehicle?? I wonder if one could
> use large ferrite beads to choke off the spectrum of the spark from
> radiating off the wire at the frequencies of interest. 1 mhz and
> above? I have done a lot of grounding , and am using resistor plugs
> and wires..  Are there any shielded wire kits out there?


From [e-mail] Wed Feb 21 16:06:26 1996
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Need Contact for Don Johnson RE: Screwdriver Antenna
Date: 19 Feb 1996 16:29:36 GMT
Message-ID: <4ga8hg$[e-mail]>

If anyone knows an email address, snail mail address, phone
number, callsign, anything...please forward.  I want to enquire
about his "screwdriver antenna" design.

73s
de KI5XW



From [e-mail] Wed Feb 21 16:06:26 1996
From: Hank Blackstock <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: Need Contact for Don Johnson RE: Screwdriver Antenna
Date: 19 Feb 1996 22:27:00 GMT
Message-ID: <4gatfk$[e-mail]>
References: <4ga8hg$[e-mail]>
To: [e-mail]

David Nulton <[e-mail]> wrote:
>If anyone knows an email address, snail mail address, phone
>number, callsign, anything...please forward.  I want to enquire
>about his "screwdriver antenna" design.
>
>73s
>de KI5XW
>
Callsign is W6AAQ.

73 Hank WA5JRH



From [e-mail] Wed Feb 21 16:06:27 1996
From: Jim Brown <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need GE LBI-3615 Manual
Date: Wed, 14 Feb 1996 21:30:06 -0500
Message-ID: <[e-mail]>
Reply-To: [e-mail]

I am looking for the manuals for a GE LBI-3615 GE Power Amp Model
4EF5A1 Rev. B.  If anyone has this manual I would be happy to pay
for the duplication and cost of mailing.

Thanks es 73 de WM3O <Jim>


From [e-mail] Wed Feb 21 16:06:28 1996
From: [e-mail] (Charles T. Young)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED GPS INFORMATION  MY NEW HOBBY!!!
Date: 18 Feb 1996 22:09:05 -0500
Message-ID: <4g8pkh$[e-mail]>
References: <4fpefq$[e-mail]>

RStapestry ([e-mail]) wrote:
:  I wish to build a working GPS reciever. Can anyone out there provide me
: with links to the technical data and/or circut designs to build one?
: I don't believe that it's proprietary, so someone out there must have
: built their own... right?
: Any help is appreciated.
:
: Btw, I'm 16 and also into robotics. Parts Donations Welcome (low budget
: here!!).
: Thanx

I suggest that you don't bother to build your own.  They look really
complicated, full of proprietary software.  I think GPS is fascinating
but you will end up with a whole tabletop full of stuff to emulate
what goes on in a pocket sized case.


I think you are best off saving your money do buy one and finding
interesting things to do with it.

There have been articles in 73 Amateur Radio Today and QST about
things to do with store-bough GPSs, but they dont build them for
the same reason they don't build their own handi-talkies.

Chuck Young  [e-mail]



From [e-mail] Wed Feb 21 16:06:30 1996
From: [e-mail] (Eric-Jan W÷sten)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED GPS INFORMATION  MY NEW HOBBY!!!
Date: Mon, 19 Feb 1996 10:17:47 GMT
Message-ID: <4g9lld$[e-mail]>
References: <4fpefq$[e-mail]> <4g8pkh$[e-mail]>
Reply-To: [e-mail]

[e-mail] (Charles T. Young) wrote:

>RStapestry ([e-mail]) wrote:
>:  I wish to build a working GPS reciever. Can anyone out there provide me
>: with links to the technical data and/or circut designs to build one?
>: I don't believe that it's proprietary, so someone out there must have
>: built their own... right?
>: Any help is appreciated.
>:
>: Btw, I'm 16 and also into robotics. Parts Donations Welcome (low budget
>: here!!).
>: Thanx

>I suggest that you don't bother to build your own.  They look really
>complicated, full of proprietary software.  I think GPS is fascinating
>but you will end up with a whole tabletop full of stuff to emulate
>what goes on in a pocket sized case.


>I think you are best off saving your money do buy one and finding
>interesting things to do with it.

>Hi!


Sure you can build one....it's been done by Madjaz Vidmar in I think
is called VHF-Communications, a German magazine and as far as I
know also available in the USA....
I'm sure that building a trx for example for  HF which is good, is
more expensive than buying one, so the price is not always an
argument.
I'm at my qrl here, if someone wants to know exactly which VHF-COMM
decribes the GPS-system, just let me know.


73, Eric
\   Eric-Jan Wosten DDS
 \  Best, Holland
  =========================

Internet: [e-mail]
AMPRnet: [e-mail]
AX25:pa3cev@pi8zaa.#bra.nld.eu



From [e-mail] Wed Feb 21 16:06:32 1996
From: [e-mail] (Brett Coningham)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Handheld Doppler Ant Circuit
Date: Sun, 18 Feb 1996 20:40:57 GMT
Message-ID: <4g82tb$[e-mail]>
References: <4g0inc$[e-mail]>

Hi Steve,

I'll bet you are looking for the "Handi-Finder", which was described
in QST, May, 1993, pg. 35.   This circuit was not really a doppler
design, but one of the "time difference of arrival" designs.   I don't
have a fax at home, and cannot use the work fax for personal
use (even collect),  but maybe one of the other folks reading
this can help.   If all else fails, I CAN mail you a copy. Let me
know.

73 de Brett AB5P
-------------------------------
[e-mail] wrote:

>Hello:

>It never fails, you keep a magazine for years and one day decide you
>should toss it out. Within seconds of the garbage man taking it away,
>you NEED an article from it!!!

>I'm looking for an article on building a handheld D.F. antenna with a
>small doppler circuit on the handle. This particular one looked like a
>bow tie antenna on a short handle with a 9vdc battery and PCB doppler
>circuit attached. I can't remeber which mag it was in, but it was a
>few years old.

>If you have the article or a similar circuit, can you PLEASE contact
>me and I'll pay for costs to get a copy.

>If you wish, you could fax it to me, call my voice phone number and
>I'll arrange for the fax to be collect.



>Steve Crawford, VE7IIF
>Ph: [phone]
>Fax: [phone]



>PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38
>Finger: [e-mail] for PGP Public Key


>Steve Crawford
>PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38
>Finger: [e-mail] for PGP Public Key


[e-mail]
Albuquerque Transmitter Hunting Homepage:
     http://www.swcp.com/~ab5p/foxhunt.html



From [e-mail] Wed Feb 21 16:06:33 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Handheld Doppler Ant Circuit
Date: 16 Feb 1996 00:22:04 GMT
Distribution: world
Message-ID: <4g0inc$[e-mail]>
Reply-To: [e-mail]

Hello:

It never fails, you keep a magazine for years and one day decide you
should toss it out. Within seconds of the garbage man taking it away,
you NEED an article from it!!!

I'm looking for an article on building a handheld D.F. antenna with a
small doppler circuit on the handle. This particular one looked like a
bow tie antenna on a short handle with a 9vdc battery and PCB doppler
circuit attached. I can't remeber which mag it was in, but it was a
few years old.

If you have the article or a similar circuit, can you PLEASE contact
me and I'll pay for costs to get a copy.

If you wish, you could fax it to me, call my voice phone number and
I'll arrange for the fax to be collect.



Steve Crawford, VE7IIF
Ph: [phone]
Fax: [phone]



PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38
Finger: [e-mail] for PGP Public Key


Steve Crawford
PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38
Finger: [e-mail] for PGP Public Key



From [e-mail] Wed Feb 21 16:06:34 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: need info..sorenson power supply
Date: Mon, 19 Feb 96 09:27:31 PDT
Message-ID: <[e-mail]>


i need any literature,schematics for a dcr10-40b sorenson power supply.
made by raytheon co.
email [e-mail]
call 610 588 4463
de bill n3ipj



From [e-mail] Wed Feb 21 16:06:35 1996
From: [e-mail] (IAESTE Oslo)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need: Scematics for CW tranciever
Date: 19 Feb 1996 09:31:47 GMT
Message-ID: <4g9g23$[e-mail]>

Hi!
As a (fairly) new radio amateur, I am planning to go to Malta
for the summer holliday, and then take along a CW tranciever.
Therefore, I am looking for the posibillities to build one myself.
I only need the simplest of CW trancievers, something that's light
and easy to make, one band is enough.

I hope some friendly person out there would point me to some
inforemation about this, on WWW or ftp, or email: [e-mail]

73 de LC1MAT/LB4PE
packet: [e-mail]



From [e-mail] Wed Feb 21 16:06:36 1996
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Not a binaries group? QRP Schematics
Date: Sat, 17 Feb 1996 19:39:29 GMT
Message-ID: <4g5aus$[e-mail]>
References: <4f0sru$[e-mail]> <[e-mail]> <[e-mail]> <4g51h1$[e-mail]>

[e-mail](Tim Hynde ka8ddz/qrp Rochester, MI ) wrote:



>Well Mr. Woolley, where exactly would you want QRP schematics posted?
>I don't understand why you would not post it here since this is a
>newsgroup dedicated to QRP, schematics, building, etc.

>Tim Hynde
>ka8ddz

Tim,
     Thanks, but I'll save you the "flame job" that I got for asking
and then posting the first one!  I knew it was poor netiquette to post
binaries on a non-binary news group, but after I asked and got several
positive responses, I did it with the first and smallest one to give
it a try.  Apparently there is quite a bit of lag time on some
servers, I got negative responses after I posted the file.
     The problem with binaries is that several folks apparently get
this newsgroup through a mailing list, therefore they get everything
that gets posted whether they want it or not.  A binary file takes too
much time for them to download, especially if they are paying by the
minute.
     I posted the short one first to give it a try, but now have found
a better way.  All of the schematics will be on John Cunliffe's web
page at:

www.frontiernet.net/~cunliffe

He'll put them up as soon as he gets them.  I already sent him the
first two files.  This way, the guys who get the newsgroup from a list
won't have to put up with it.  When he gets all the files posted, I'll
drop a note on here.

Thanks for the help, but the guys are right, it really isn't the best
way to do it, it was just the only way I had at the time!
73,
Kerry Miller
WD5ABC

Loook for us on Field Day - N5 Big Texas Hombres (N5BTH) at 5 watts!




From [e-mail] Wed Feb 21 16:06:38 1996
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RE:Not a binaries group? QRP Schematics
Date: Sat, 17 Feb 96 20:58:50 GMT
Message-ID: <[e-mail]>
References: <4f0sru$[e-mail]> <[e-mail]> <[e-mail]> <4g51h1$[e-mail]>
Reply-To: [e-mail]

In article <4g51h1$[e-mail]>
           [e-mail](Tim
           "Tim Hynde ka8ddz/qrp Rochester, MI " writes:

>  In regards to the QRP schematics scanned and ready,
>
>
> >In article <[e-mail]>,  <[e-mail]> wrote:
> >>
> >>I think here is as good a place as any to post them.  Personally I
> would
> >>prefer JPEG's.  I would start with one and see what kind of response
> you get.
> >>They should be uuencoded first.
> >
> >Do not post them here.  This is not a binaries group and news admins
> don't
> >like hidden binaries groups; they are even more likely to block them
> than
> >overt binaries groups.
> >
> >JPEG is not a good format for line drawings.  TIFF FAX, PCX and GIF
> are
> >all better at handling them (JPEG is very good for natural images,
> though).
> >--
> >David Woolley, London, England          [e-mail]
>
>
> Well Mr. Woolley, where exactly would you want QRP schematics posted?
> I don't understand why you would not post it here since this is a
> newsgroup dedicated to QRP, schematics, building, etc.

David is quite right, images and binaries have no place on a newsgroup
like this. The schematics should be put on a server somewhere, so that
they can be downloaded using ftp. A short periodic posting could then be
made to inform people where they are, or a mention made in the group's
FAQ. This way, they are always available, people know where they are,
and bandwidth isn't wasted distributing them to people who don't want
them. This is simply good "netiquette", and is probably in this group's
charter, that was promulgated when it was formed, and should also be in
the FAQ, if one exists.

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


From [e-mail] Wed Feb 21 16:06:39 1996
From: [e-mail] (Rich Mulvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Not a binaries group? QRP Schematics
Date: 17 Feb 1996 21:13:06 GMT
Message-ID: <[e-mail]>
References: <4f0sru$[e-mail]> <[e-mail]> <[e-mail]> <4g51h1$[e-mail]>
Reply-To: [e-mail]

On 17 Feb 1996 16:59:13 GMT, Tim Hynde ka8ddz/qrp Rochester, MI <timhynde@ix.n
etcom.com> wrote:
> In regards to the QRP schematics scanned and ready,
>
>
>>In article <[e-mail]>,  <[e-mail]> wrote:
>>>
>>>I think here is as good a place as any to post them.  Personally I
>would
>>>prefer JPEG's.  I would start with one and see what kind of response
>you get.
>>>They should be uuencoded first.
>>
>>Do not post them here.  This is not a binaries group and news admins
>don't
>>like hidden binaries groups; they are even more likely to block them
>than
>>overt binaries groups.
>>
>>JPEG is not a good format for line drawings.  TIFF FAX, PCX and GIF
>are
>>all better at handling them (JPEG is very good for natural images,
>though).

>
>Well Mr. Woolley, where exactly would you want QRP schematics posted?
>I don't understand why you would not post it here since this is a
>newsgroup dedicated to QRP, schematics, building, etc.


   You wouldn't want to post it here, because it's generally considered
to be poor USENET practice - many people pay for their news/mail
feeds, and don't particularly like paying for massive posts in discussion
groups.  Not to mention that the ignorant poster will quite likely
be mail-bombed.  :-)


   The *PROPER* way is to post a short note indicating the FTP site where
the schematic can be retrieved, or the address of a web page where it
can be viewed.  As it happens, there is a QRP mailing list at
lehigh.edu that also has an FTP site full of QRP-related material.
That would be a fine place to put it.

- Rich

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



From [e-mail] Wed Feb 21 16:06:40 1996
From: [e-mail](Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: RE:Not a binaries group? QRP Schematics
Date: 17 Feb 1996 16:59:13 GMT
Message-ID: <4g51h1$[e-mail]>
References: <4f0sru$[e-mail]> <[e-mail]> <[e-mail]>

 In regards to the QRP schematics scanned and ready,


>In article <[e-mail]>,  <[e-mail]> wrote:
>>
>>I think here is as good a place as any to post them.  Personally I
would
>>prefer JPEG's.  I would start with one and see what kind of response
you get.
>>They should be uuencoded first.
>
>Do not post them here.  This is not a binaries group and news admins
don't
>like hidden binaries groups; they are even more likely to block them
than
>overt binaries groups.
>
>JPEG is not a good format for line drawings.  TIFF FAX, PCX and GIF
are
>all better at handling them (JPEG is very good for natural images,
though).
>--
>David Woolley, London, England          [e-mail]


Well Mr. Woolley, where exactly would you want QRP schematics posted?
I don't understand why you would not post it here since this is a
newsgroup dedicated to QRP, schematics, building, etc.

Tim Hynde
ka8ddz


From [e-mail] Wed Feb 21 16:06:42 1996
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 14 Feb 1996 23:57:51 GMT
Message-ID: <4ftstv$[e-mail]>
References: <willmore.823905417@whelk> <4fiqeh$[e-mail]>

In article <4fiqeh$[e-mail]>, Tom Bruhns <[e-mail]> wrote
:
>David A Willmore ([e-mail]) wrote:
>: It seems that every time I look for information on PLL loop filter design,
>: they focus on simple implementation of the loop filter.  Is it because
>: simple one or two pole filters are the ideal filters for this use or
>: is there some other design constraint involved?  The filter only has to
>: work in the audio range--from my understanding.  Would a brick wall, low
>: pass filter of a high order be a better solution?  What if you could widen
>: the passband while tuning and narrow it down once you have aquired lock?
>
>The problem is that the filter is part of a closed-loop feedback control
>system.  If you have unity gain and net 360 degrees phase shift in the
>loop, you are going to have oscillations.  Since high-order filters have
>large phase shifts where their gain is still high, they aren't appropriate
>for use in a closed loop.
>
>--
>Cheers,
>Tom
>[e-mail]

Tom is of course right, but I did a study to determine how much filtering
you could get away with before the loop oscillates.  The best I came up
with was to use an elliptic function filter (typically 5 or 7 poles)  with
a bandwidth about 10 to 20 times the loop bandwidth.   If you obey that
constraint, you will lose only a manageable amount of phase margin.  The
elliptic function filter is in addition to the normal second order lead
lag filtering for the loop.  It is important to use elliptic function
filters, NOT all-pole filters such as Butterworth, Chebyshev, "Linear
Phase", Bessel, etc.  I have built many successful loops this way.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Wed Feb 21 16:06:44 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (David Stockton)
Subject: Re: PLL loop filter questions and idea
Message-ID: <[e-mail]>
Date: Fri, 16 Feb 1996 13:38:45 GMT
References: <willmore.824330070@whelk>

David A Willmore ([e-mail]) wrote:

: Supposedly, the filters come in an eliptic variety which, I would think,
: would not suffer from this much.


    Elliptics are even worse as you approach the 3db frequency. Check the
group delay plots in Zverev.


    I've used elliptic filters in the tuning lines of phase-locked loops
many times in the past, for special reasons, but the filter has to have its
3dB point at a much, much, higher frequency than the loop bandwidth to
prevent the filter spoiling the loop response.

     Unless there is some special reason forcing high-order filters into
a loop - which is more important than the compromised loop that results,
avoid them like the plague.  Straight forward RC networks with the loop
amplifier are just about ideal, though a notch or two to kill the psd ref
freq and its worst harmonics can be useful.


: Hmmm, I'll have to give them a look.  This design is for personal use,
: BTW.  I don't do these things for a career. :)

     I do.  The loops with fancy filtering were specialised frequency
summing loops and other loops used as tracking jitter demodulators - the
filters controlled the jitter demodulation bandwidth, the loops were set
for sub-Hertz bandwidths.

      Have a look at the end of chapter 14 in 1995 and 1996 ARRL
handbooks for a run-down on a practical methodology for designing PLL
characteristics.

   Cheers
          David
                   GM4ZNX



From [e-mail] Wed Feb 21 16:06:45 1996
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: Sun, 18 Feb 1996 13:22:56 -0800
Message-ID: <[e-mail]>
References: <willmore.823905417@whelk> <[e-mail]>

All of us might want to check out the latest issue of COMMUNICATIONS
QUARTERLY.  There are quite a few VCO desgins therein and a number of PLL
considerations worth reading..   73   Cliff    W6HDO


On Sun, 18 Feb 1996, Eric M. Brombaugh wrote:

> In article <willmore.823905417@whelk>, [e-mail] (David A
> Willmore) wrote:
>
> > What if you could widen
> > the passband while tuning and narrow it down once you have aquired lock?
>
> That's not a bad idea in some situations.  Generally though, you want
> the loop filter to be as wide as possible in order to track out the
> inherent noise of your VCO.  Sometimes you want to FM the VCO by adding
> an audio signal to the output of the loop filter - then, a narrower loop
> filter won't track out your FM signal.
>
> > Maxim has some nice eighth order switched capacitor filters which could
> > easily fill this role.  They are clocked at 100 times the highest passed
> > frequency and are available in the three classic filter topoligies.  It
> > would be easy to put in a 1MHz clock with a 10x prescaler for a wide
> > passband and then increase the prescaler value (eight bit counter) when
> > the PLL has locked.  Would this do what I think and decrease phase noise?
>
> Typically, the clock-feedthrough of a SCF will tend to cause nasty sidelobes
> on your VCO unless you place additional RC filters in the circuit.
> Essentially, the requirements for the loop filter are easy to achieve
> with a simple 2nd order circuit.  SCFs really don't add anything to the
> performance.
>
> > Just a few thoughts and questions.  BTW, anyone have a good VCO design for
> > 60.7 to 64.7 MHz? :)
>
> You might want to check out Motorola App Note AN980 and the data sheet
> for the MC3362 for some tips on such things.  The MC3362 has a built-in
> oscillator and varactor diode which work up to 180 MHz, and I have seen
> 40m designs using it as well.
>
> --
> Eric Brombaugh     KC7GXA
> [e-mail] (private)
> [e-mail]   (work)
>
>


From [e-mail] Wed Feb 21 16:06:48 1996
From: [e-mail] (Eric M. Brombaugh)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: Sun, 18 Feb 1996 11:46:22 -0700
Message-ID: <[e-mail]>
References: <willmore.823905417@whelk>

In article <willmore.823905417@whelk>, [e-mail] (David A
Willmore) wrote:

> What if you could widen
> the passband while tuning and narrow it down once you have aquired lock?

That's not a bad idea in some situations.  Generally though, you want
the loop filter to be as wide as possible in order to track out the
inherent noise of your VCO.  Sometimes you want to FM the VCO by adding
an audio signal to the output of the loop filter - then, a narrower loop
filter won't track out your FM signal.

> Maxim has some nice eighth order switched capacitor filters which could
> easily fill this role.  They are clocked at 100 times the highest passed
> frequency and are available in the three classic filter topoligies.  It
> would be easy to put in a 1MHz clock with a 10x prescaler for a wide
> passband and then increase the prescaler value (eight bit counter) when
> the PLL has locked.  Would this do what I think and decrease phase noise?

Typically, the clock-feedthrough of a SCF will tend to cause nasty sidelobes
on your VCO unless you place additional RC filters in the circuit.
Essentially, the requirements for the loop filter are easy to achieve
with a simple 2nd order circuit.  SCFs really don't add anything to the
performance.

> Just a few thoughts and questions.  BTW, anyone have a good VCO design for
> 60.7 to 64.7 MHz? :)

You might want to check out Motorola App Note AN980 and the data sheet
for the MC3362 for some tips on such things.  The MC3362 has a built-in
oscillator and varactor diode which work up to 180 MHz, and I have seen
40m designs using it as well.

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


From [e-mail] Wed Feb 21 16:06:49 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: Mon, 19 Feb 1996 11:54:44 GMT
Message-ID: <4g9oln$[e-mail]>
References: <willmore.823905417@whelk> <4fj5uf$[e-mail]>

Hi

On same subject, is there a better filter after a PLL than the
classical with opamp, 2 resistances and 2 capacitors ?

Regards



Have
a nice                    [e-mail]
Day



From [e-mail] Wed Feb 21 16:06:50 1996
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 15 Feb 1996 17:44:00 GMT
Message-ID: <4fvrd0$[e-mail]>
References: <willmore.823905417@whelk> <4fiqeh$[e-mail]> <4ftstv$[e-mail]>

In article <4ftstv$[e-mail]>,
Richard Karlquist <[e-mail]> wrote:
>In article <4fiqeh$[e-mail]>, Tom Bruhns <[e-mail]> wrot
e:
>>David A Willmore ([e-mail]) wrote:
>>: It seems that every time I look for information on PLL loop filter design,
>>: they focus on simple implementation of the loop filter.  Is it because
>>: simple one or two pole filters are the ideal filters for this use or
>>: is there some other design constraint involved?  The filter only has to
>>: work in the audio range--from my understanding.  Would a brick wall, low
>>: pass filter of a high order be a better solution?  What if you could widen
>>: the passband while tuning and narrow it down once you have aquired lock?
>>
>>The problem is that the filter is part of a closed-loop feedback control
>>system.  If you have unity gain and net 360 degrees phase shift in the
>>loop, you are going to have oscillations.  Since high-order filters have
>>large phase shifts where their gain is still high, they aren't appropriate
>>for use in a closed loop.
>>
>>--
>>Cheers,
>>Tom
>>[e-mail]
>
>Tom is of course right, but I did a study to determine how much filtering
>you could get away with before the loop oscillates.  The best I came up
>with was to use an elliptic function filter (typically 5 or 7 poles)  with
>a bandwidth about 10 to 20 times the loop bandwidth.   If you obey that
>constraint, you will lose only a manageable amount of phase margin.  The
>elliptic function filter is in addition to the normal second order lead
>lag filtering for the loop.  It is important to use elliptic function
>filters, NOT all-pole filters such as Butterworth, Chebyshev, "Linear
>Phase", Bessel, etc.  I have built many successful loops this way.

Why are you using this additional filter? - the only real issue I
can think of is to reduce reference sideband level, the importance
of which depends on the application.  At the same time, the elliptic
filter may become a significant source of noise if built with
active devices, resulting in a trade-off between sideband suppression
and phase noise content.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Wed Feb 21 16:06:52 1996
From: [e-mail] (Douglas L. Datwyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 19 Feb 1996 14:22:00 GMT
Message-ID: <4ga128$[e-mail]>
References: <willmore.823905417@whelk> <4flegc$[e-mail]>

In article <4flegc$[e-mail]>, [e-mail] says...
>
>>Maxim has some nice eighth order switched capacitor filters which could
>>easily fill this role.  They are clocked at 100 times the highest passed
>>frequency and are available in the three classic filter topoligies.  It
>>would be easy to put in a 1MHz clock with a 10x prescaler for a wide
>>passband and then increase the prescaler value (eight bit counter) when
>>the PLL has locked.  Would this do what I think and decrease phase noise?
>
>PLL 'Filters' don't actually filter as such.  They serve to set the
>loop bandwidth and damping factors and as such only need one or two
>poles.  For basic loops there is nothing to be gained by going to
>higher order filters.  The PLL can only clean up phase noise closer to
>the carrier than the loop bandwidth.  Phase noise needs to be
>minimised at start by using as wide a loop bandwidth as possible and a
>VCO with an inherently good phase noise performance in its own right.
>
>
>Don't even think of using switched capacitor filters in PLLs.  There
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Better tell Linear Technologies Corp. Thieir Design Note 7 utilizes an
LTC1062, a 5th order, switched-capacitor filter for the loop filter. The note
shows the jitter of a standard RC filter in a CD4046 loop and a filter built
with this part. THe jitter is down to internal jitter of VCO (Claimed).

Douglas L. Datwyler  WR7O
[e-mail]

>could easily be horrible interactions between switching components and
>loop frequencies!
>
>73  Andy  G4JNT
>



From [e-mail] Wed Feb 21 16:06:53 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: PostScript to Gerber
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]>
Date: Thu, 15 Feb 1996 17:50:43 GMT

In article <[e-mail]> [e-mail] (Russ Re
naud) writes:
>
>Is there any shareware utility that will convert a ppostscript file
>to Gerber format (for cad/cam), or a shareware cad app that will
>read a postscript and output in Gerber?

The folks in rec.crafts.metalworking are facing this same problem.
I believe you'll find that unless the Postscript file uses only
the basic line drawing primitives, information is lost and you won't
be able to reconstruct a CAD file from the Postscript file.

Postscript is a printer language, IE it describes a bitmap in
terms of a set of descriptive primitives, and isn't generally
a good geometric object language suitable for CAD.

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


From [e-mail] Wed Feb 21 16:06:54 1996
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PostScript to Gerber
Date: 16 Feb 96 20:58:03 GMT
Message-ID: <stefans.824504283@bauv111>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]

[e-mail] (Gary Coffman) writes:

>In article <[e-mail]> [e-mail] (Russ R
enaud) writes:
>>
>>Is there any shareware utility that will convert a ppostscript file
>>to Gerber format (for cad/cam), or a shareware cad app that will
>>read a postscript and output in Gerber?

>The folks in rec.crafts.metalworking are facing this same problem.
>I believe you'll find that unless the Postscript file uses only
>the basic line drawing primitives, information is lost and you won't
>be able to reconstruct a CAD file from the Postscript file.

>Postscript is a printer language, IE it describes a bitmap in
>terms of a set of descriptive primitives, and isn't generally
>a good geometric object language suitable for CAD.

Exactly speaking, PostScript is a programing language having a lot
of language elements suitable for various tasks, but especially
for graphics. There are language elements for bitmaps as well as
for vectors, circles of fonts. Have a look on the PostScript FAQ.

73,
--
Claude
([e-mail])
The opinions expressed above represent those of the writer
and not necessarily those of her employer.


From [e-mail] Wed Feb 21 16:06:55 1996
From: [e-mail] (Kenneth Burtchaell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Printer generated transparency problem
Date: 17 Feb 1996 20:51:04 GMT
Distribution: world
Message-ID: <4g5f3o$[e-mail]>
References: <4ep7jg$[e-mail]> <4f2lje$[e-mail]> <4g08g5$[e-mail]>

My printer controls darkness by software command.I use paintbrush for my
pcbs as most the layouts are straight lines.Look up sci.electronics.
basics for a recent article describing various toner transfer methods  73
Ken



From [e-mail] Wed Feb 21 16:06:57 1996
From: ecloud@goodguy (Shawn Rutledge)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Printer generated transparency problem
Date: 15 Feb 1996 21:27:33 GMT
Message-ID: <4g08g5$[e-mail]>
References: <4ep7jg$[e-mail]> <4f2lje$[e-mail]>

ian white ([e-mail]) wrote:
: [e-mail] (Kenneth Burtchaell) wrote:

: >I am experiecing difficulty in getting a good solid blackening in the
: >solid trace areas of PCB layout transparencies on my Okidata OL400
: >printer.It has been suggested to me that this might be a electro static
: >induced problem . Anybody have any good ideas?
: >
: >      73 Ken W6GHV
: I have been trying to do the same with my KODAK lazer printer.
: Generally it is black enough now I have set it darker from the slider
: bar in printer setup options in windows 3.1. although the acetate film

My Brother HL-8V (HPIII compatible, uses the Canon SX engine - paper
tray in front, output on the top) has a knob inside to adjust "darkness"
as well, and it really makes quite a difference (in output, I
haven't tried making PC boards yet).  If your printer looks similar to an
HPIII it probably has this control as well.  Open the printer as if
you were going to change the toner cartridge, and the knob is on the
front left corner of the open space.

: I am using goes a bit crinckly through the heated rollers.
: Have you any suggestions as to software for making PCB layouts?

Corel Draw works nicely if you are doing it by hand, or if you have an
old pattern not suitable form directly photocopying onto acetate,
you can scan it, import it into Corel, and then draw the traces over top
(trace the scanned version).  When you're done tracing it, remove the
bitmap from the background and you will have nice cleaned up artwork.
The nice thing about Corel (as opposed to some generic CAD program) is
the ease of doing curved lines, and making closed shapes which you can
fill solid black.  Alternatively, you could take the scanned version into
Photoshop, tweak the brightness and contrast to get rid of smudges and
inconsistency, use the line tool, paint brushes, etc. to clean up edges
and light areas, and print that, but Photoshop would be one of the worst
choices for creating a layout from scratch.

If you're going to design a circuit, there are some schematic capture
and PC board layout packages.  I got Chipmunk and some other package,
both for Linux, and they appear quite nice and easy to work with but
I haven't done any real work with them yet.  My conclusion after designing
one board with a really ancient version of PCAD that I picked up at a
hamfest is that doing a schematic first isn't worthwhile unless you need
it for documentation, or can afford one of the nice ($1000+) design programs
that has a worthwhile router.  PCAD did such a lousy job routing that I
ended up doing layout from scratch anyway, and mentally verifying the operatio
n
of the circuit based on the pc board layout rather than the schematic.


--
  _______                      KB7PWD @ KC7Y.AZ.US.NOAM   [e-mail]
 (_  | |_)   Shawn T. Rutledge    on the web: http://www.goodnet.com/~ecloud
 __) | | \__________________________________________________________________
* PIC * alternative energy * packet * VRML * Star Trek * Khoros * X window *


From [e-mail] Wed Feb 21 16:06:58 1996
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: QRP Schematics
Date: Wed, 21 Feb 1996 12:29:29 GMT
Message-ID: <4gf38m$[e-mail]>

Ok, I finally got them all finished.  The schematics are at John
Cunliffe's web page:

http://www.frontiernet.net/~cunliffe

If you have problems, drop me a note, I have all the original
articles.  Have fun!
73,
Kerry Miller
[e-mail]




From [e-mail] Wed Feb 21 16:06:58 1996
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Safe mains voltage connector.
Date: 16 Feb 1996 17:26:55 GMT
Message-ID: <4g2eov$[e-mail]>
References: <[e-mail]>

Dave Kirkby ([e-mail]) wrote:
: I have a need for a connector to handle 240 VAC @ 30 A. Nothing unusal you t
hink. The
: problem is, that either side (plug or socket) of the connector may be live.
Has that
: exhaused all possibilities, or does something exits that works safely ??????

I haven't had any experience with them, but what about the connectors that
are designed to be connected/disconnected underwater?  I'd guess they may
do a good job protecting both the "plug" and the "socket" ends from
contact.



--
Cheers,
Tom
[e-mail]


From [e-mail] Wed Feb 21 16:06:59 1996
From: Barry Newberger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Spec for AMD ID8031AH MCU
Date: 18 Feb 1996 06:57:47 GMT
Distribution: world
Message-ID: <4g6ilb$[e-mail]>

Can someone tell me what package and operating
temperature range the prefix ID denotes
on the subject line microcontroller.

Thanks,
Barry Newberger W5KH


From [e-mail] Wed Feb 21 16:07:00 1996
From: [e-mail] (Ronald Doctors)
Newsgroups: rec.radio.amateur.homebrew
Subject: TEK SCOPES 4 SALE
Date: Fri, 16 Feb 96 22:05:33 GMT
Message-ID: <4g2v3d$[e-mail]>

GOT a 585 witha type 82 this is a 1.5 nanosec rise time scope and also
a 535A with a CA plugin. I'll take the best offer recievd in the next 30 days.
I am in Santa Barbar CA shipping OK freight prepaid or UPS.


From [e-mail] Wed Feb 21 16:07:01 1996
From: [e-mail] (McCarthy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tubes
Date: Sun, 18 Feb 1996 05:35:57 GMT
Message-ID: <4g66rh$[e-mail]>

Need 2 tubes:
12BY7A
S2001 or 6146B
                                             Thanks
                                             Robert KC5RYI
                                             [e-mail]



From [e-mail] Wed Feb 21 16:07:02 1996
From: [e-mail] (Geert Pirens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Want to made myself a SWR and Milli Watt meter.
Date: Sat, 17 Feb 1996 00:44:37 GMT
Message-ID: <4g38cu$[e-mail]>

Hello


Can somebody help me on this ?

I want to make myself a SWR and Power meter for the 2M and 70cm.

If you have some Schematic diagrams or PCB layouts ?

Plaese let me now

ALL INFORMATION IS WELKOM

73!

Geert, ONL2057




From [e-mail] Wed Feb 21 16:07:03 1996
From: [e-mail] (Geert Pirens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted schematic diagram of SWR and power meters. who can help ?
Date: Sat, 17 Feb 1996 00:47:03 GMT
Message-ID: <4g38hh$[e-mail]>
Reply-To: [e-mail]

Hello


Can somebody help me on this ?

I want to make myself a SWR and Power meter for the 2M and 70cm.

If you have some Schematic diagrams or PCB layouts ?

Plaese let me now

ALL INFORMATION IS WELKOM

73!

Geert, ONL2057




From [e-mail] Wed Feb 21 16:07:04 1996
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB 6,000 watt linear amp 75 meters
Date: Sun, 18 Feb 1996 23:47:18 GMT
Message-ID: <4g8dri$[e-mail]>
References: <4g2jqm$[e-mail]>

[e-mail] wrote:

>       Please forward info.

If you can find an old Alpha 77 2-holer, it will do it.  I saw a guy
do 8kw before he started a fire at the base of the tower.  Guess the
shunt feed for 160 wasn't up to it!  Too much hassle to run that much
pwr.
73,
Kerry
WD5ABC

PS  It's a hassle, but he was S9+40 in Europe!




From [e-mail] Wed Feb 21 16:07:05 1996
From: [e-mail] (Rich Mulvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB 6,000 watt linear amp 75 meters
Date: 18 Feb 1996 16:15:47 GMT
Message-ID: <[e-mail]>
References: <[e-mail]> <4g6vfl$[e-mail]> <[e-mail]>
Reply-To: [e-mail]

On Sun, 18 Feb 1996 08:33:06 -0400, [e-mail] <[e-mail]> wrote:
>In article <4g6vfl$[e-mail]> [e-mail] (W8JI  Tom) wri
tes:
>>From: [e-mail] (W8JI  Tom)
>>Subject: Re: WTB 6,000 watt linear amp 75 meters
>>Date: 18 Feb 1996 05:36:37 -0500
>
>I thought 1500w was the legal limit?

   It's a troll, son.  :-)


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



From [e-mail] Wed Feb 21 16:07:05 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB 6,000 watt linear amp 75 meters
Date: Sun, 18 Feb 1996 08:33:06 -0400
Message-ID: <[e-mail]>
References: <[e-mail]> <4g6vfl$[e-mail]>

In article <4g6vfl$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>From: [e-mail] (W8JI  Tom)
>Subject: Re: WTB 6,000 watt linear amp 75 meters
>Date: 18 Feb 1996 05:36:37 -0500

I thought 1500w was the legal limit?


From [e-mail] Wed Feb 21 16:07:07 1996
From: [e-mail] (Kerry W. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB 6,000 watt linear amp 75 meters
Date: Mon, 19 Feb 1996 23:07:44 GMT
Message-ID: <4gavt8$[e-mail]>
References: <4g8dri$[e-mail]> <4g9p8k$[e-mail]>

[e-mail] (W8JI  Tom) wrote:

>In article <4g8dri$[e-mail]>, [e-mail] (Kerry W.
>Miller) writes:

>>
>>If you can find an old Alpha 77 2-holer, it will do it.  I saw a guy
>>do 8kw before he started a fire at the base of the tower.  Guess the
>>shunt feed for 160 wasn't up to it!  Too much hassle to run that much
>>pwr.
>>73,
>>Kerry

>No offense Kerry, but that must have been a VERY special 77 two holer or
>the guy was BS'ing you. For example, I can find a lot of old Pontiac GTO
>owners that claim their cars run 11's!   ;-)  If that ETO was really doing
>8 k out, the fire would have been in the amplifier! Maybe with the
>feedpoint arcing the meter said 8 kW, but 4 or 5 kW of it must have been
>reflected power!
>
>77 two holers only run around 3-4 kW out (even with the bigger
>transformer)! 160 is one of the worst bands, where they only do around 3
>kW or so out. Even at that power, the HV is down from 4000 volts no load
>to 3 kV!!!!

>The plate choke is too small and the tank is too inefficient on 160, there
>is no input matching (just a parallel L/C circuit), and the power supply
>is WAY too weak. Even if you fixed all of that, the grids of the 8877's
>would pop like last week's Mexican dinner if each 8877 was pushed past 3
>kW. With a big external plate supply and a big exciter a 77 owner is VERY
>lucky to see 5 kW out.

>It takes a lot more than a tiny little girly whimp like an 8877 (or a even
>a pair of those little sissies) to do 8 kW! It takes a man sized amp with
>some real hair under it's arms.

>73 Tom.
Tom,
     Hi!  It really will do it, but not for long.  The 8kw was on a
PEP meter, not a "real" meter.  The 8877 won't last long at that rate,
but this guy has more money than sense anyway.  He has a wall full of
OO cards, collects them like QSLs!
73,
Kerry
PS  Yep, he's full of it, but I saw the meter this time, I thought he
was lying too, had to go see it.  Does that make me an accessory?




From [e-mail] Wed Feb 21 16:07:08 1996
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB 6,000 watt linear amp 75 meters
Date: 18 Feb 1996 15:41:56 GMT
Message-ID: <4g7hc4$[e-mail]>
References: <[e-mail]> <4g6vfl$[e-mail]> <[e-mail]>



'In article <4g6vfl$[e-mail]> [e-mail] (W8JI  Tom)
'writes:
'From: [e-mail] (W8JI  Tom)
'Subject: Re: WTB 6,000 watt linear amp 75 meters
'Date: 18 Feb 1996 05:36:37 -0500

'I thought 1500w was the legal limit?

1500W is the legal limit, But what if he want's to run 1500W at reduced IMD.



From [e-mail] Wed Feb 21 16:07:08 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB HP5082-2900 diodes (not from I.R.&C.)
Date: 17 Feb 1996 20:39:48 GMT
Message-ID: <4g5eek$[e-mail]>

I need 4 to 8 of these diodes,but I don't want to pay more than $4 each.



From [e-mail] Wed Feb 21 16:07:09 1996
From: Russ <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew
Subject: WTB, H.D. Bandswitch
Date: Fri, 16 Feb 1996 13:55:59 -0700
Message-ID: <[e-mail]>
Reply-To: [e-mail]

I am building a 4-1000A Amp and almost have the
Power Supply done, 5000 volts at .5 Amps plus. The
RF deck is being laid out now and I realize the
Bandswitch I was going to use won't cut it at a
6000 ohm plate impedance. Looking for 4-6 positions
SPDT OK for simple Pi net. Anyone have a spare
switch for my beast??

Russ, WA6CWV, Boise Idaho


From [e-mail] Wed Feb 21 16:07:10 1996
From: Roland S Geter PhD <[e-mail]>
Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap
Subject: Re: WTB:5KW AM Transmitter
Date: 17 Feb 1996 07:58:55 GMT
Message-ID: <4g41rv$[e-mail]>
References: <4fn47d$[e-mail]>
To: [e-mail]

What are you going to do with it?

Roland S Geter PhD
Internet:  [e-mail]
  Packer:  [e-mail]



From [e-mail] Wed Feb 21 16:07:11 1996
From: Roland S Geter PhD <[e-mail]>
Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap
Subject: Re: WTB:5KW AM Transmitter
Date: 17 Feb 1996 07:57:37 GMT
Message-ID: <4g41pi$[e-mail]>
References: <4fn47d$[e-mail]>
To: spiro,evagelakos

What are you going to do with it?

Roland S Geter PhD
Internet:  [e-mail]
  Packer:  [e-mail]



From [e-mail] Tue Feb 27 20:09:38 1996
Newsgroups: rec.radio.amateur.homebrew
From: Helmut Strickner <[e-mail]>
Subject: Re: ### KISS on a Baycom?
Message-ID: <[e-mail]>
Date: Thu, 22 Feb 1996 00:14:20 GMT
To: [e-mail]
References: <[e-mail]> <[e-mail]> <[e-mail]>

[e-mail] (Edwin Teh) wrote:
>In article <[e-mail]>, Helmut Strickner <[e-mail]
> writes:
>
>> There are a number of KISS drivers around for the Baycom - style modem.
>
>> TFPCX
>> TFX
>> probably some more that I dont recall off the top of my head.
>
>> For NOS use AX25.COM from Pawel Jalocha.
>
>Thanks for your helpful infomation - but I'm to understand baycom
>style modems don't work on unix(and it's varients) based systems
>due to the way they operate.
>
>I haven't seen any KISS drivers for the Baycom for unix.
>
>73 de 9V1ZY
>
>--
>[e-mail]              -[ Standard Disclaimers Apply ]-
>
>          Now Faith is a substance of things hoped for,
>           the evidence of things not seen. [Heb 11:1]
>
>             As Email can be altered electronically,
>     the integrity of this communication is not guaranteed.
>
>
>


Hi Edwin,

You did not mention in your first posting that you want to use the Baycom
modem on a *NIX system.
Of course the ax25.com driver can only be used under DOS.
It takes quite a bit of CPU power to use the driver due to its function
of bit timing etc.

There is possibly a driver for Baycom modem out there which runs under
LINUX but I dont know. Your best bet is to put a posting in the .linux
newsgroups.

What is your reason to run TCP/IP on a UNIX platform, there is a lot of
programmes available which run on DOS and can do all you need.

If you need a unix platform and want to use the Baycom modem why dont you
use a low cost PC 286/386 as front end and network it to your unix
machine using TCP/IP?

To get more response I would also suggest to use the more appropriate
newsgroup rec.radio.amateur.digital.misc, there are far more people with
the knowledge required to help you reading your postings. Most computer
guys are not really "into" homebrew.

73 de Helmut VK4STR




From [e-mail] Tue Feb 27 20:09:39 1996
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 'Memory keyer - Public domain code'
Date: 20 Feb 1996 08:29:12 GMT
Message-ID: <4gc0oo$[e-mail]>
References: <4fvojr$[e-mail]> <[e-mail]>

In article <[e-mail]>,
Jay Wicklund  <[e-mail]> wrote:
>
>In article <4fvojr$[e-mail]>, <[e-mail]> writes:
>
>> Well... I pose an idea...
>>
>> Pool a list of desired features, get a group of geeks together via
>> internet, and group write and post the source code, and design and
>> build a public domain keyer... and then make a group article for QST
>>
>> Sound plausable, or am I asking for a democracy in the land of
>> chaos?
>
>Hi Ed, sounds like an interesting project, and maybe something like
>this might get this group doing more that talking (spice things up a
>little).  Its been getting a little boring here, and it is a homebrew
>group.
>
>As for the processor, what is the power requirements of the HC11?  I
>would think you would want to keep the power low, and would also think
>that the 6805 family might have some lower powered versions available.
>If I remember right, some of that family can also program themselves
>by a simple connection to a PROM.

Look for the lowest cost part with decent availability, not someone's
favorite processor.  The Atmel 89C2051 is a 20 pin 8051 processor with
1 or 2 K of on-chip EEPROM.  The PIC processors come in a dozen
different flavors.

We really can't tell without doing more of a feature/cost brainstorm
session, but HC11 or 68HC05 or 80C51 might be overkill in power and
cost.  I believe it is Wayne Burdick that already supplies a memory
keyer in a PIC for a QRP kit.... maybe he'd make a variant of the
source code PD?


--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Tue Feb 27 20:09:40 1996
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 15pin video,  want to use old monitor
Date: 26 Feb 1996 12:58:57 GMT
Message-ID: <4gsaqh$[e-mail]>
References: <4gnt6c$[e-mail]>

In article <4gnt6c$[e-mail]>, [e-mail](Tim Hynd
e ka8ddz/qrp Rochester, MI) says:
>
>
> I've got an old laptop (386) Im going to dedicate to the ham shack,
>mostly to run Hamcomm, Baycomm, and perhaps JVFAX. It has a 15 pin
>output for a VGA monitor, since everything I'm running is CGA and even
>then, mostly text based I want to use an amber monitor pulled out of a
>terminal. As best I can tell there are 3 inputs to the monitor for
>horz,vert, and video. (I may not have those terms correct but I know
>they are the minimum nessesary) I've successfully connected it to an
>old Sinclair Z-80, but dont want  to blow the video out of the laptop.
>
>Any suggestions on which pins will provide the nessesary signals. I'm
>just not up on the types of signals comming from the 15 pin video out.
>
>Thanks for any and all input.
>
>73, Tim
>ka8ddz
LAter today I will try to Email the VGA pinout for a
HD(high density)DB15. Sadly, you are going to run into e problem that
stoped me when I was given an IBM PS1.  VGA horizontal starts out at
about twice the horizontal of CGA.  CGA is 15750HZ and VGA is 31,500Hz.
Then there is the fun of vertical.  CGA is 60.0Hz, while VGA runs from
60 to 70 hz, with the sync polarity changing again depending on mode.
Super VGA has the same pin out as VGA, but, H freq runs from 35,370
up to as high as 60,800.  I am a TV Engineer and aster frying several
CGA(actually monochrome green and ambers)monitors, I just gave up an
scrounged up a VGA monitor.
Good Luck
The figures I quated are from a 'PC Hardware' handbook, in the subsection
on Video Standards.  I have seen slightly different figures in some
IBM documentation once, but, if memory serves correctly, they all
are withen a few percent of each other.
up to


From [e-mail] Tue Feb 27 20:09:41 1996
From: [e-mail] (David Lawson)
Newsgroups: rec.radio.amateur.homebrew
Subject: 49 mhz to 6 meter conversion
Date: 23 Feb 1996 08:09:34 GMT
Message-ID: <4gjsnu$[e-mail]>

I have recently read an article in the Boston Amateur radio club archives
about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter
tranciever with a 1 repeater coverage. Does anyone know why this shouldnt
work with a simple crystal change? Has anyone done it? It might become my
next project.

David Lawson
KF4EBP



From [e-mail] Tue Feb 27 20:09:42 1996
From: [e-mail] (Mark A. Garrett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 49 mhz to 6 meter conversion
Date: 23 Feb 1996 17:39:33 GMT
Message-ID: <4gku4l$[e-mail]>
References: <4gjsnu$[e-mail]>
Reply-To: [e-mail] (Mark A. Garrett)


In a previous article, [e-mail] (David Lawson) says:

>I have recently read an article in the Boston Amateur radio club archives
>about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter
>tranciever with a 1 repeater coverage. Does anyone know why this shouldnt
>work with a simple crystal change? Has anyone done it? It might become my
>next project.
>
>David Lawson
>KF4EBP
>
I have done it.  It is really quite simple to change over the 1 channel
units that are crystal controlled.  If you order crystals order wire leads
so that you can lay over the transmitter cystal over on the board (if you
use the hc18 style and mount it vertical you will not get the case closed)
Tuneup is straighforward.  You might want to add a small pot to the fixed
resistor squelch circuit to loosen up the squelch and come up with another
type of antenna (at 50mw you still have only a 1/4 mile range tops with
the antennas on these units.  A decent antenna or beam can really help out
on range).>

--
Mark Garrett   [e-mail]
               KA9SZX @ N9LNQ.#ECIL.IL.USA.NOAM


From [e-mail] Tue Feb 27 20:09:43 1996
From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ? transverter 10m-70cm
Date: Fri, 23 Feb 1996 14:36:36 +0000
Distribution: world
Message-ID: <[e-mail]>
References: <4fsn2a$[e-mail]>

In article <4gju1n$[e-mail]>,  wrote:
>[e-mail] (Hans Reiser (CIP 95)) wrote:
>
>>Hello!
>
>>I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and
>>i'm looking for any information about this. Any hints how to do
>>so would be appreciated, as well as sources for schematics, literatur,
>>etc, and personal experiences with this.
>>One additional intended use of my project is in digital communication,
>>and therefor I'm especially interested in the capability of
>>full-duplex operation (simultanious TX and RX), and fast (electronic)
>>TX/RX switching. And of course I'm interested also in
>>low-budget-designs... :-)
>
>>Thanks for your replies.
>
>>        Hansi.
>
>>-----
>>Hansi Reiser, dl9rdz         <[e-mail]>
>>                             WWW-URL:   <http://home.pages.de/~dl9rdz>
>>                             packet radio: <dl9rdz@db0wgs.#bay.deu.eu>
>
>73,
>The 70 cm - 10m transverter named DX'ers transverter for 432 Mhz with
>good performance IP3, sensitivity... g4hgt design has been published
>in 'THE VHF/UHF DX BOOK' (g3sek Ian White - editor) , published by DIR
>PUBLISHING LTD, p.box 771, Buckingham MK18 4HH, England
>

Wait... there may be a better design coming up soon in the DUBUS
magazine. The G4HGT design works well but is not easy to get going -
mostly because of the difficulty in preventing Norton amplifiers from
oscillating.


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


From [e-mail] Tue Feb 27 20:09:44 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ? transverter 10m-70cm
Date: Fri, 23 Feb 1996 17:28:03 GMT
Message-ID: <4gju1n$[e-mail]>
References: <4fsn2a$[e-mail]>

[e-mail] (Hans Reiser (CIP 95)) wrote:

>Hello!

>I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and
>i'm looking for any information about this. Any hints how to do
>so would be appreciated, as well as sources for schematics, literatur,
>etc, and personal experiences with this.
>One additional intended use of my project is in digital communication,
>and therefor I'm especially interested in the capability of
>full-duplex operation (simultanious TX and RX), and fast (electronic)
>TX/RX switching. And of course I'm interested also in
>low-budget-designs... :-)

>Thanks for your replies.

>        Hansi.

>-----
>Hansi Reiser, dl9rdz         <[e-mail]>
>                             WWW-URL:   <http://home.pages.de/~dl9rdz>
>                             packet radio: <dl9rdz@db0wgs.#bay.deu.eu>

73,
The 70 cm - 10m transverter named DX'ers transverter for 432 Mhz with
good performance IP3, sensitivity... g4hgt design has been published
in 'THE VHF/UHF DX BOOK' (g3sek Ian White - editor) , published by DIR
PUBLISHING LTD, p.box 771, Buckingham MK18 4HH, England

GL, de Pavel Reberc, S57RA, [e-mail]




From [e-mail] Tue Feb 27 20:09:45 1996
From: [e-mail] (ZaaX)
Newsgroups: rec.radio.amateur.homebrew
Subject: Are Ten-Tec Transverters Any Good?
Date: 20 Feb 1996 03:58:57 -0500
Message-ID: <4gc2gh$[e-mail]>
Reply-To: [e-mail] (ZaaX)

I would like to hear from anyone that has built a Ten-Tec 6 metre
transverter.
How good is the receiver? Would you build one again? Any impressions
would be most welcome!

73 Zack Schindler
N8FNR


From [e-mail] Tue Feb 27 20:09:46 1996
From: [e-mail] (PaulS90212)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are Ten-Tec Transverters Any Good?
Date: 22 Feb 1996 01:39:28 -0500
Message-ID: <4gh330$[e-mail]>
References: <4gcro2$[e-mail]>
Reply-To: [e-mail] (PaulS90212)

I have worked a number of hams using the Ten-Tec transverters.  They all
sounded quite good and the owners really liked them.

- Paul, N6DN


From [e-mail] Tue Feb 27 20:09:47 1996
From: Francis Lyn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are Ten-Tec Transverters Any Good?
Date: 22 Feb 1996 12:52:03 GMT
Message-ID: <4ghotj$[e-mail]>
References: <4gc2gh$[e-mail]> <4gcro2$[e-mail]>

A friend and myself both built up the TenTec 6 m transverter last year.
It's a well designed piece of gear that performs exceptionally well. It
is complete, well documented, and not hard to put together. I use mine
with a Kenwood TS50 to get on to the new 6 m repeater just put in service
by the local club.

This transverter is exceptional in that it has everything necessary built
in; input attenuator, T/R switch, and 3 connectors for the antennas/rig.
No messing about with T/R switching signals from the rig.

The only small gripe I have is that the PCB board could have been of a
higher quality, but hey, what do you expect for a kit costing $100!
Technically, the PCB board supplied does the job just as well as a
an epoxy-glass board would.

73
Francis Lyn, VE3TDL.



From [e-mail] Tue Feb 27 20:09:48 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are Ten-Tec Transverters Any Good?
Date: 22 Feb 1996 17:49:07 GMT
Message-ID: <4giaaj$[e-mail]>
Reply-To: [e-mail]
Keywords: TenTec 6meter

Best $95 I've ever spent on radio gear!!!!!!!!!!

Gene,
wd4mps
Birmingham, AL
EM-63



From [e-mail] Tue Feb 27 20:09:49 1996
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: building a packet interface
Date: Tue, 20 Feb 1996 10:32:13 -0700
Message-ID: <[e-mail]>
References: <4g822s$[e-mail]> <4gas0d$[e-mail]>
To: Glenn Sparks <[e-mail]>

Over 50% of PC's will work with an unmodified Digicom (the actual name
for the German TNC-emulator for the Commodore series) modem, all you
have to do is wire in a serial connector that fits your PC, and Baycom
software for your PC.  For a schematic of the necessary connections you
can view my web page listed in my signature, page down until you get to
the packet radio links.
--
|-------------------------------------------------------|
|Jim Devenport  WB5AOX                                  |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|HTTP://nis-www.lanl.gov/~jdport/                       |
|-------------------------------------------------------|


From [e-mail] Tue Feb 27 20:09:50 1996
From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: building a packet interface
Date: 19 Feb 1996 22:01:49 GMT
Message-ID: <4gas0d$[e-mail]>
References: <4g822s$[e-mail]>

You can get Baycom software for the IBM pc also.  It is on the QRZ
CDrom, and I would suspect on their home page also.

I think the schematics for the modem are in the documentation, if not
it is probably just a matter of putting in a RS-232 driver chip



In <4g822s$[e-mail]> [e-mail] (Chuck
Dicken,314 Hayes Hall,3727757,) writes:
>
>
>Ill reference Feb 1996 73 magazine, article "Basic Packet Modem".
> Doesn't seem to difficult to replicate and the price sure beats
>whats available commercially.  (if all you want is the BASIC packet).
>
>Sometime ago, I built a baycom for my C-64.  The questions I have,
>
>1.  Can this C-64 baycom interface be modified to run on an IBM?
>
>2.  If it can be changed, what software could be used (Procomm
>    perhaps)?
>
>3.  Has anyone sucessfully done what I am looking for?
>
>       Thanks for stopping and looking in.
>        73's  Chuck
>
>
>--
>Ham Call  WD8ICP                            /      /        /
>Internet  [e-mail]          /      /        /
>Telephone [phone]                  /______/________/
>                                         /      / |      /



From [e-mail] Tue Feb 27 20:09:51 1996
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: building a packet interface
Date: Thu, 22 Feb 1996 09:22:59 -0700
Message-ID: <[e-mail]>
References: <4gd8ie$[e-mail]> <4gfamb$[e-mail]>
To: Lyle Murphy <[e-mail]>

BAYCOM refers to software that allows a PC to be used as a Terminal Node
Controller (TNC) for packet radio communications.  All functions except
tone-to-digital (modem) functions take place inside the computer itself,
thus requiring a relatively simple and inexpensive modem to interface
the radio to the PC.  This software was originally developed by the
German authors for the Commodore 64/128 machines which was called
Digicom.
--
|-------------------------------------------------------|
|Jim Devenport  WB5AOX                                  |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|HTTP://nis-www.lanl.gov/~jdport/                       |
|-------------------------------------------------------|


From [e-mail] Tue Feb 27 20:09:52 1996
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Comb and interdigital filters for diplexers
Date: 22 Feb 1996 12:37:35 GMT
Message-ID: <4gho2f$[e-mail]>

Hi,
do you think that a diplexer such as :

- Having less than 1 dB of insertion loss at 1297 MHz.
- Having more than 80 dB of attenuation at 1291 MHz

can be built using "standard" (not microstrip, but with rods) comb or
interdigital filters ?

A cavity filter costs more than $750, it's too expensive for me.

THX et 73
Vincent

--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From [e-mail] Tue Feb 27 20:09:54 1996
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Comb and interdigital filters for diplexers
Date: 24 Feb 1996 20:22:01 GMT
Message-ID: <4gns19$[e-mail]>
References: <4gho2f$[e-mail]> <4gl0m6$[e-mail]>

Glenn Elmore ([e-mail]) wrote:

: Q of the resonator.  However, I agree with the other response that
: simultaneously achieving low insertion loss and high stopband that close
: is going to be a challenge for this kind of implementation.

I barely have the choice. I cannot place a pre-amp before the filter,
and any loss will affect the noise figure. And outputing 10 W...

: If I were trying to do it, I think I'd investigate inexpensive ways to
: make the highest Q resonator I could, almost certainly a copper or
: silver cavity of some kind.  Once determined, I'd see how many of them
: it would take to get the required performance.

I have done it. 3 should do the job (3 cavities). But the Q of a single
rod cannot reach 1000 ?

:   Having some machining capability will no doubt help here.

We have a machine (sorry, the English name is unknown to me !) - it's
called a "tour" in French.
The diplexer should be used for a repeater. It would perhaps be the
first 23 cm repeater in France, and it would be multimode (FM, BLU).


: If you are interested in a lesser filter, I'd be happy to supply the
: design of a ~.5 dB IL, ~30 MHz wide interdigital filter I've built.
: They're easy to fabricate, cheap and perform well, though not even close
: to what you are asking for.

It won't help me for the diplexer, but it may be useful at other stages
of the repeater (especially after the final up-mixer).

Thanx ES 73 :-)
Vince, F5RCS


From [e-mail] Tue Feb 27 20:09:57 1996
From: [e-mail] (Glenn Elmore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Comb and interdigital filters for diplexers
Date: 23 Feb 1996 18:23:02 GMT
Message-ID: <4gl0m6$[e-mail]>
References: <4gho2f$[e-mail]>

Elendir ([e-mail]) wrote:

: do you think that a diplexer such as :

: - Having less than 1 dB of insertion loss at 1297 MHz.
: - Having more than 80 dB of attenuation at 1291 MHz

: can be built using "standard" (not microstrip, but with rods) comb or
: interdigital filters ?

: A cavity filter costs more than $750, it's too expensive for me.


  I have designed and built interdigital filters using ~10 mm diameter
brass rods in copper boxes with various numbers of sections.  These work
very well, give stable and repeatable performance due to the basic high
Q of the resonator.  However, I agree with the other response that
simultaneously achieving low insertion loss and high stopband that close
is going to be a challenge for this kind of implementation.

  I suspect that to get that kind of performance you'll find yourself
with larger volume structures or at least a lot more elements.
It may start to look a lot like  the $750 implementation you mention.

If I were trying to do it, I think I'd investigate inexpensive ways to
make the highest Q resonator I could, almost certainly a copper or
silver cavity of some kind.  Once determined, I'd see how many of them
it would take to get the required performance.
  Having some machining capability will no doubt help here.

If you are interested in a lesser filter, I'd be happy to supply the
design of a ~.5 dB IL, ~30 MHz wide interdigital filter I've built.
They're easy to fabricate, cheap and perform well, though not even close
to what you are asking for.


73
Glenn Elmore n6gn

amateur IP:     [e-mail]
Internet:       [e-mail]

|--------------- N6GN's Higher Speed Packet WWW Page -------------------|
|                                                                       |
|       ftp://col.hp.com/hamradio/packet/n6gn/index.html                |
|                                                                       |
|-----------------------------------------------------------------------|







From [e-mail] Tue Feb 27 20:09:58 1996
From: Gareth Edwards <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Comb and interdigital filters for diplexers
Date: Fri, 23 Feb 96 14:37:26 GMT
Message-ID: <[e-mail]>
References: <4gho2f$[e-mail]>
Reply-To: [e-mail]

In article <4gho2f$[e-mail]> [e-mail] "Elendir" writes:

> Hi,
> do you think that a diplexer such as :
>
> - Having less than 1 dB of insertion loss at 1297 MHz.
> - Having more than 80 dB of attenuation at 1291 MHz
>
> can be built using "standard" (not microstrip, but with rods) comb or
> interdigital filters ?
>
> A cavity filter costs more than $750, it's too expensive for me.
>
> THX et 73
> Vincent
>
> --
> F5RCS - Worldwide Friendship through Amateur Radio
> ENST, Ecole Nationale Superieure des Telecommunications, Paris
>

Vincent,

I'm a filter engineer by trade, and this sounds like a tough job.
I presume there is a passband required and a stop band required, rather
than just two spot frequencies. If this is the case, then I don't
think an all pole Chebyshev would be up to the job; you'd probably need
a ridiculous number of poles and resonators about half a metre across.

For comparison, we cellular guys have a passband requirement of
<1dB from 880-915MHz, > about 60dB attenuation 925-960MHz, and usually
use 7 or 8 poles and a couple of finite frequency zeros a la elliptic
filter to do the job. Tough to design and tune if you don't have either
a) a deep understanding of filter theory or b) lots of brute force
computing power and a very good optimiser.

In short, not the kind of spec *I* would look forward to, and I get paid
for this.

I know this doesn't help, but I just thought I'd throw in the
professional perspective.

Cheers,
Gareth.


--
I don't want the world; I just want your half. - TMBG
------------------------------------------------------------------
|  Gareth Edwards       |  [e-mail]           |
|  Edinburgh,           |  Home of Edinburgh Beige Cricket Club  |
|  Scotland             |  PGP public key available on request   |
------------------------------------------------------------------


From [e-mail] Tue Feb 27 20:10:00 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (John Seboldt)
Subject: DigiBrain Spur/Noise Elimination?
Message-ID: <rohrwerk-2302962250450001@10.0.2.15>
Date: Sat, 24 Feb 1996 04:50:43 GMT

March QST's refinement of the DigiVFO (adding a microprocessor and "knob"
tuning with display) looks wonderful.  It raises, of course, the same
question I had about the original:  additional circuitry needed to "clean
up" the output to avoid spurs on receive.  (Spurs at only 70 dB down can
mean lots of receive birdies!)  I'd love to apply it to my R2 setup, but
not at the price of tons of spurs and noise!

A good PLL is of course the obvious solution... but I wonder... I am using
a 74HC240 buffer to generate square wave drive for my system... similar to
the buffer of the "remote VFO" project a while back.  Would this tend to
take care of those spurs and noise, the chips responding only to the main
(strongest) signal in shaping the square wave?

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
 <http://www.lehigh.edu/lists/qrp-l/k0jd/index.html>


From [e-mail] Tue Feb 27 20:10:01 1996
From: [e-mail] (Charles J. Mishmash)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: DS-1A (DC-DC converter for Kenwood) question
Date: 24 Feb 1996 16:23:02 GMT
Message-ID: <4gne16$[e-mail]>
References: <4ft09j$[e-mail]> <[e-mail]> <4gaq03$[e-mail]>

In article <4gaq03$[e-mail]>, [e-mail] says...
>
>charles copeland ([e-mail]) wrote:
>: In article <4ft09j$[e-mail]>,
>: Ken Edwards <[e-mail]> wrote:
>: >I have a Kenwood TS-820S that I would like to run off battery in
>: >cases of emergency.
<snip>
>:How is the power (DC) connected into the system ?
>
The TS-820S that I had only required the DS-1A (2 Transistors & Heatsink). The

original transformer had separate winding for the DS-1A.  Worked very nicely.
 I wanted to build my own, but could not find the transistors at the time
(early 1980's)

Charlie AA7NQ



From [e-mail] Tue Feb 27 20:10:02 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: File formats to download
Date: Thu, 22 Feb 96 09:34:25 PDT
Message-ID: <[e-mail]>
References: <4foh5t$[e-mail]> <[e-mail]>  <4ge356$[e-mail]>


In article Christer Johansson writes:

> I must say that I agree 100% even if I didn't bought any shares in
> Adobe. The PDF format is *GREAT* for technical publications and now
> when the Netscape plugin is avaiable I think it will become more and
> more common.
>
 Only one caution; the first time that I downloaded a large datasheet
using pdf, my system warned me that it was possible to imbed macros
and viruses in the pdf documents that could disrupt your system - and
therefore to only download documents from sources that you trust.

I don't know much about Acrobat and the pdf format so I can't verify
the accuracy of the warning, but I have no reason to doubt it.  Other
than that caution, I agree it does result in very nice looking
documents and in more compact form than postscript.

73 de KI7RH




From [e-mail] Tue Feb 27 20:10:03 1996
From: [e-mail] (Christer Johansson)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: File formats to download
Date: Wed, 21 Feb 1996 03:13:40 GMT
Message-ID: <4ge356$[e-mail]>
References: <4foh5t$[e-mail]> <[e-mail]>
Reply-To: [e-mail]

Hi Rit,

[e-mail] (Rit Keiter) wrote:

>Recently, I was so impressed with Adobe's Acrobat PDF (Portable
>Document File) format, that I bought 300 shares of their stock.  I
>also purchased their $125 Adobe Exchange for win that produces .pdf's
>from any app that can print to a windows printer.  Portable means all
>platforms; Windows, Macs, Unix.

I must say that I agree 100% even if I didn't bought any shares in
Adobe. The PDF format is *GREAT* for technical publications and now
when the Netscape plugin is avaiable I think it will become more and
more common.

>I discovered Acrobat by visiting the Maxim Integrated Products site
>(search on maxim).  They have a link to the free reader download.   I
>downloaded a 10 page Maxim data sheet in 45 seconds at 14.4 K.  I was
>astounded by the quality and detail of the line art and the tiny
>fonts.  It took 4 minutes to print on an old HP laser III without
>Postscript capability.  May be much faster with Postscript printers.

Yes, many of the Semiconductor manufacturers have their datasheets and
application notes available in PDF and I like to be able to get new
tech info right from the net and maybe someday my crowded bookshelfs
will dissapear :-)....

>I have used Exchange on a 255K WordPerfect document containing several
>Acad generated line dwgs, to produce a 110K PDF that prints with no
>perceptible degradation.

The PDF format has "builtin" compression and it's quite effective as
you just mentioned. Good luck with your stocks ;-)...

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] Tue Feb 27 20:10:04 1996
From: [e-mail] (Brian Jones)
Newsgroups: rec.radio.amateur.homebrew
Subject: First QRP CW kit.
Date: Mon, 26 Feb 1996 18:29:59 GMT
Message-ID: <4gsu79$[e-mail]>
Reply-To: [e-mail]

I'm looking to build a QRP CW transceiver preferably for 20m. Any
reccomendations for a good kit for a first time builder. I can solder
OK and probably manage fairly fine tracks but don't have a barrage of
test equipment (except a good multimeter and an old 'scope which I'm
pretty inexperienced at using).

I'd like something reasonably challenging but not to difficult to
align with rudimentary gear which doesn't cost an arm and leg  (and of
course which will work VP9 on 1milliwatt at sunspot cycle low !!).


Brian Jones G0UKB - KB8YKJ

[e-mail]



From [e-mail] Tue Feb 27 20:10:05 1996
From: [e-mail] (Henrik Holmgaard)
Newsgroups: rec.radio.amateur.homebrew
Subject: Frankfurt VLF time standard
Date: Thu, 22 Feb 96 16:28:35 PST
Message-ID: <4gi22t$[e-mail]>

Hi All

Does anybody in this news group Where I can get information about
Frankfurt VLF time standard: freq., time specifications, etc.
if anybody have a ciurcit for at reciever to this Time standard.

Henrik
[e-mail]



From [e-mail] Tue Feb 27 20:10:06 1996
From: [e-mail] (Magne M{hre)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Frankfurt VLF time standard
Date: 24 Feb 1996 10:18:49 GMT
Message-ID: <4gmom9$[e-mail]>
References: <4gi22t$[e-mail]>

Henrik Holmgaard ([e-mail]) wrote:
: Hi All

: Does anybody in this news group Where I can get information about
: Frankfurt VLF time standard: freq., time specifications, etc.
: if anybody have a ciurcit for at reciever to this Time standard.

Look up http://www.tu-bs.de/rz/sysadmin/dienste/ntp/clock.txt.html

The document describes various standard time/frequency stations, with
the protocols, frequencies etc. used.

--Magne




From [e-mail] Tue Feb 27 20:10:07 1996
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Frankfurt VLF time standard
Date: 23 Feb 1996 09:38:34 GMT
Message-ID: <4gk1uq$[e-mail]>
References: <4gi22t$[e-mail]>

Henrik Holmgaard ([e-mail]) wrote:
: Hi All
: Does anybody in this news group Where I can get information about
: Frankfurt VLF time standard: freq., time specifications, etc.
: if anybody have a ciurcit for at reciever to this Time standard.

You mean DCF77 ?

I guess it's on 77 kHz, and there has been a decoder published some time
ago on Elektuur.

I'll try to get more info.

73, Vince
--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From [e-mail] Tue Feb 27 20:10:08 1996
From: [e-mail] (Thierry Wautelet)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Frankfurt VLF time standard
Date: Sun, 25 Feb 1996 16:54:29 +0100
Message-ID: <[e-mail]>
References: <4gi22t$[e-mail]>

In article <4gi22t$[e-mail]>,
[e-mail] (Henrik Holmgaard) wrote:

>Hi All
>
>Does anybody in this news group Where I can get information about
>Frankfurt VLF time standard: freq., time specifications, etc.
>if anybody have a ciurcit for at reciever to this Time standard.
>
>Henrik
>[e-mail]
>

Hi,

Freq is 77 Khz (easy enough, it's called DCF77).
Take a look at some Elektuur (or whatever it's called in your national
language if there is an edition), you should be able to find
more info.
I have 2 clocks (one analog other digital) running on DCF77,
nice gadget makrr are CITIZEN and JUNGHANS.
There a lot of clocks available quite cheap from german company.
Also interface for PC (and Mac ?).
Hope it help,
Thierry


----------------------------------------------------------------------------
Internet : [e-mail]              A PowerMac User !
CIS      : 76334,337
Ham      : ON7KL@ON7RC.#BT.BE.EU



From [e-mail] Tue Feb 27 20:10:09 1996
Newsgroups: rec.radio.amateur.homebrew
Subject: FS  --  SHURE  450  DISK  MIC
Message-ID: <[e-mail]>
From: Bill <[e-mail]>
Date: 17 Feb 96 21:39:15 CST

SHURE MODEL 450 desk mic

Selectable impedance:

                HI-Z = 15K ohm
                LO-Z = 215 ohm


$35.00

I will pay all shipping and C.O.D. fees to any address
in lower 48 states.

Bill
AA4FM/0



From [e-mail] Tue Feb 27 20:10:10 1996
Newsgroups: rec.radio.amateur.homebrew
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: FS: Jenning Vacuum Caps
Message-ID: <[e-mail]>
To: [e-mail]
References: <Pine.BSD/[e-mail]>
Date: Sat, 24 Feb 1996 00:45:06 GMT

Are the caps still available?  Do you have any mounting hardware?  I
might as well ask this too, do you have any transmitting type "doorknob"
ceramic capacitors, 1000pf @ 20KV or 500pf @ 20 KV?
let me know please.
73, Al




From [e-mail] Tue Feb 27 20:10:11 1996
From: Bill Meara <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Hamtronics e-mail???
Date: 24 Feb 1996 11:30:13 GMT
Message-ID: <4gmss5$[e-mail]>

I'm having a bit of trouble with my Hamtronics 435 mhz tranverter (no
doubt caused by me!)  Anyone have an e-mail address for them.  Better
yet, are there any tranverter guru's out there?   Bill  N2CQR/HI8



From [e-mail] Tue Feb 27 20:10:11 1996
From: [e-mail] (bandyopadhyay,asismoy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help Please !!!
Date: 20 Feb 1996 18:18:21 -0500
Distribution: usa
Message-ID: <4gdkrt$[e-mail]>



I need the following transistors:

MJH16010A - 2pcs. probably Motorola

ZTX650 - 4 pcs. & ZTX750 - 4 pcs. - probably Zetex ?

I tried Mouser, Digikey, no luck. Digikey can order
ZTX 650 and 750 for me but it would take 18 weeks!

Will Motorola or Zetex (?) entertain orders for
such miniscule quantities ?

Any ideas ????

Thanks - asis  VU2MKI






From [e-mail] Tue Feb 27 20:10:12 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with Heath VTVM!!!!
Date: Fri, 23 Feb 96 13:19:51 PDT
Message-ID: <[e-mail]>
References: <4gj9k5$[e-mail]>


Hi Jeff,  I can't think of anything obvious but there are a couple of
things that you can look at.

1. put the meter in the ohms position with the probes disconnected or
open.  Does it read full scale now?  This also puts 1.5v onto the
meter circuit but without the DC input attenuator in the circuit.  If
this doesn't give you full scale (you might have to adj the ohms adj),
then the problem is most likely in the 12AU7 & meter circuit.  If it
does look normal, then the problem is most likely in the probe and
attenuator circuit.

2.  You didn't say which model, but if it has the combined AC/DC/OHMs
probe, try putting the probe switch (not the mode selector) into the
AC/ohms position while probing the 1.5v battery.  This will bypass the
1m resistor in the probe.  If the meter now adjusts to full scale it
suggests that the input attentuator has too low a resistance and the
1meg in the probe is dropping the voltage.  If you have a good DVM you
can try measuring the input attenuator resistance (do this with the
VTVM power off and the plug pulled.  Then just connect the dvm probes
to the VTVM probes - you should get 11meg).

Let me know what you find----we'll get it working....Jay



From [e-mail] Tue Feb 27 20:10:14 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with Heath VTVM!!!!
Date: 24 Feb 1996 00:21:17 GMT
Message-ID: <4glllt$[e-mail]>
References: <4gj9k5$[e-mail]>
Reply-To: [e-mail]

In <4gj9k5$[e-mail]>, [e-mail] (Jeffrey L. Bau
man) writes:
>
>
>I'm having the dumb problem of not being able to swing the
>needle all the way over to the 1.5V marker by adjusting the DC
>calibrate pot.  All wiring is correct, and the 12AU7 is just
>fine.
>
>Double checked the wiring - it's correct, with no apperent
>cold solder joints.  Correct components in place.
>
>I wired this myself recently, and just cant "calibrate" the
>meter.
>
>Anyone know of any mods / errata on this VTVM?  it
>'s the wide one with the large meter.  The box pivots in a
>"U" shaped mounting bracket.
>
>Probe is fine.  1.5V voltage source fine.  This is stupid, but
>just can't get it to calibrate!
>
>Thanks,
>
>Jeff
>WB5KZW
>--

 Hi Jeff,
  If you have another meter, you just might want to check the B+ and the other
voltages to the tube. Even though you have a good tube, you may not be putting
the correct DC levels to it.  Good luck.

                                                     WD9AHF - Jim



From [e-mail] Tue Feb 27 20:10:14 1996
From: [e-mail] (Jeffrey L. Bauman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with Heath VTVM!!!!
Date: 23 Feb 1996 02:43:17 GMT
Message-ID: <4gj9k5$[e-mail]>



I'm having the dumb problem of not being able to swing the
needle all the way over to the 1.5V marker by adjusting the DC
calibrate pot.  All wiring is correct, and the 12AU7 is just
fine.

Double checked the wiring - it's correct, with no apperent
cold solder joints.  Correct components in place.

I wired this myself recently, and just cant "calibrate" the
meter.

Anyone know of any mods / errata on this VTVM?  it
's the wide one with the large meter.  The box pivots in a
"U" shaped mounting bracket.

Probe is fine.  1.5V voltage source fine.  This is stupid, but
just can't get it to calibrate!

Thanks,

Jeff
WB5KZW
--


From [e-mail] Tue Feb 27 20:10:15 1996
From: "Michael G. Reiney" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: HF receive for Yaesu FRG9600??
Date: 21 Feb 1996 21:01:49 GMT
Message-ID: <4gg17t$[e-mail]>

Is/was there available a HF receive option to the Yaesu FRG9600?
There's a blank spot on the board for the module.  The software and PLL are se
t up
to receive from zero to 999 MHz. if you use 73 MHz. first IF and high side LO
injection.

Has anyone ever tried to build such an option?

Anybody interested in working on such an option?  Except for the availability
of the
Xtal to get from 73 MHz. to 45 MHz. it should be pretty trivial.

miker



From [e-mail] Tue Feb 27 20:10:16 1996
From: [e-mail](Tim Hynde ka8ddz/qrp Rochester, MI)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrew earphone - Mike
Date: 26 Feb 1996 14:03:32 GMT
Message-ID: <4gsejk$[e-mail]>
References: <4grm8r$[e-mail]>

In <4grm8r$[e-mail]> [e-mail] (MVenable) writes:
>
>I want to use my 2-meter HT while motorcycle mobile.  I also wear a full
>face helmet.  The helmet speaker/microphone conversions are pretty pricey.
>I've seen ads for earphones that work as mikes (also expensive). Seems
>like a good do-it-yourself project.   Does anyone know how to homebrew an
>earphone-mike that will work under the helmet?
>
>Thanks and 73
>
>Mark Venable N1RSK
>

Hi Mark:

I used to ride and had a Bell full face, I used a simple electret mike
element glued into the chin portion of the helment, the speaker used
was a simple 2" flat style I picked up at a hamfest. I did have to dig
out a little of the cushion inside the helmet.

The most unique portion however was a differential circuit made which
took the input from another mike element mounted on the side of the
helmet just under the lip. With motor noise comming into both elements
the differential circuit only passed my voice to the rig (Well not 100%
obviously) but WOW what a difference! Without it there was too much
engine noise to have a decent QSO.

The rest was just simple switching, I ran the PTT to a snap action
micro-switch near the horn. Hope this gives you some ideas. Good Luck

Tim, ka8ddz


From [e-mail] Tue Feb 27 20:10:17 1996
From: [e-mail] (MVenable)
Newsgroups: rec.radio.amateur.homebrew
Subject: Homebrew earphone - Mike
Date: 26 Feb 1996 02:08:11 -0500
Message-ID: <4grm8r$[e-mail]>
Reply-To: [e-mail] (MVenable)

I want to use my 2-meter HT while motorcycle mobile.  I also wear a full
face helmet.  The helmet speaker/microphone conversions are pretty pricey.
I've seen ads for earphones that work as mikes (also expensive). Seems
like a good do-it-yourself project.   Does anyone know how to homebrew an
earphone-mike that will work under the helmet?

Thanks and 73

Mark Venable N1RSK



From [e-mail] Tue Feb 27 20:10:18 1996
From: [e-mail] (Fender)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ideas on a power antenna
Date: 21 Feb 1996 15:50:14 -0500
Message-ID: <4gg0i6$[e-mail]>


Here's my idea.  I have a Lincoln Continental that I'm absolutely in love
with and I really would like to have my 2m radio in it but I'm not too eager
to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea
for a compromise.  How feasable would it be to build some sort of matchbox
so that I could run realtively low power (50 watts or less) at good SWR
through the power antenna used for the FM stereo.  I figure that if it works,
 I'd mount a second in the fender and it could retract out of the way when
not in use.  I figure that it would have a good ground plane but how
would I achieve a good match?  All advice appreciated!  If this idea doesn't
work out, anybody have any others for a rather inconspicuous  antenna?

                                        Thanks!
                                          Jay
                                        N2OTK




From [e-mail] Tue Feb 27 20:10:19 1996
From: Jim Strohm <Jim Strohm@ausq1ak>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ideas on a power antenna
Date: 22 Feb 1996 13:17:07 GMT
Message-ID: <4ghqcj$[e-mail]>
References: <4gg0i6$[e-mail]>

[e-mail] (Fender) wrote:
> anybody have any others for a rather inconspicuous  antenna?

I don't know if these are still available -- a few years ago, there
was a stick-on 2 meter antenna available that looked like some kind
of car alarm decal.  You'd just paste it inside a window.  Performance
reports were good, considering the style of antenna (couldn't touch
a 5/8 whip on the roof, but it would take > 50 watts).

You might also consider some of the on-glass antennas, if you don't
mind having people think you have a call phone.

Both of these would be simpler than loading up the FM antenna.




From [e-mail] Tue Feb 27 20:10:20 1996
From: [e-mail]@fwi.com
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ideas on a power antenna
Date: 24 Feb 1996 01:15:44 GMT
Message-ID: <4glos0$[e-mail]>
References: <4gg0i6$[e-mail]>
Reply-To: [e-mail]

In <4gg0i6$[e-mail]>, [e-mail] (Fender) writes:
>
>Here's my idea.  I have a Lincoln Continental that I'm absolutely in love
>with and I really would like to have my 2m radio in it but I'm not too eager
>to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea
>for a compromise.  How feasable would it be to build some sort of matchbox
>so that I could run realtively low power (50 watts or less) at good SWR
>through the power antenna used for the FM stereo.  I figure that if it works,
> I'd mount a second in the fender and it could retract out of the way when
>not in use.  I figure that it would have a good ground plane but how
>would I achieve a good match?  All advice appreciated!  If this idea doesn't
>work out, anybody have any others for a rather inconspicuous  antenna?
>
>                                       Thanks!
>                                         Jay
>                                       N2OTK
>
>Jay,
  Have you ever considered an 'on glass' antenna? It'll do just about every th
ing
 you want except retract. In that case you, unscrew the antenna mast and toss
 it in the back seat. It'll be a lot less hassle in the long run. They run abo
ut $50
 for a pretty good one.
                                                                            Ji
m



From [e-mail] Tue Feb 27 20:10:22 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Ideas on a power antenna
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <4gg0i6$[e-mail]>
Date: Fri, 23 Feb 1996 17:13:54 GMT

In article <4gg0i6$[e-mail]> [e-mail] (Fender) w
rites:
>
>Here's my idea.  I have a Lincoln Continental that I'm absolutely in love
>with and I really would like to have my 2m radio in it but I'm not too eager
>to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea
>for a compromise.  How feasable would it be to build some sort of matchbox
>so that I could run realtively low power (50 watts or less) at good SWR
>through the power antenna used for the FM stereo.  I figure that if it works,
> I'd mount a second in the fender and it could retract out of the way when
>not in use.  I figure that it would have a good ground plane but how
>would I achieve a good match?  All advice appreciated!  If this idea doesn't
>work out, anybody have any others for a rather inconspicuous  antenna?

Antenna Specialists offers a line of "disguise" antennas to the police
market for undercover use. They replace the stock factory entertainment
radio antenna and *look just like it*. Under the fender they're different
of course. Models are available for VHF and UHF, *and* the entertainment
radio still works too thanks to a duplexer circuit included with the
antennas.

These antennas aren't listed in amateur catalogs, just in police
supply catalogs. Check with your local PD radio shop, or talk
directly to Antenna Specialists to see if they have one for your
model Lincoln (probably so since it shares antennas with other
Fords). You could build something similar, but the mechanics could
be somewhat daunting if appearance is important.

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 Feb 27 20:10:23 1996
From: Rick Perry <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: info NORCAL QRP
Date: Wed, 21 Feb 1996 20:30:06 -0800
Message-ID: <[e-mail]>

Does anyone out there know where I can get info (cost-where to order
etc.)on the NORCAL QRP 75&20 SSB xcvr.  I've seen one and it really looks
interesting.  TNX

Rick KG7A


From [e-mail] Tue Feb 27 20:10:24 1996
From: [e-mail] (jerry shepherd)
Newsgroups: rec.radio.amateur.homebrew
Subject: KENWOOD TM-251A MODS
Date: Thu, 22 Feb 1996 04:42:27 GMT
Message-ID: <4ggs2q$[e-mail]>

i NEED ANY MODS FOR THE KENWOOD TM51-A 2 METER RIG.

[e-mail]



From [e-mail] Tue Feb 27 20:10:24 1996
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Mods for PRO-23??
Date: Thu, 22 Feb 1996 09:18:41 -0700
Message-ID: <[e-mail]>

I'm still looking for mods for the Realistic PRO-23 scanner, or a
newsgroup/list that supports such mods.  Thanks in advance,
--
|-------------------------------------------------------|
|Jim Devenport  WB5AOX                                  |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|HTTP://nis-www.lanl.gov/~jdport/                       |
|-------------------------------------------------------|


From [e-mail] Tue Feb 27 20:10:26 1996
From: [e-mail] (zimmie)
Newsgroups: rec.radio.amateur.homebrew
Subject: MOSFET X-Ref: help!
Date: 22 Feb 1996 03:08:39 GMT
Message-ID: <4ggmnn$[e-mail]>

        Recently an audio amplifier of mine ceased to work.  Upon smelling
fried semiconductor, I opened the case and found two of the power supply
FET's fried.  I assume they are MOSFET's since the company boasts of it
being a mosfet amp.

        All four (there are two banks of two) FET's are the same;
however, I cannot find any cross-referance to the number on them.  There
is an emblem on the case (TO-220) that appears to be "ST" in reverse
text, followed by the number 9448.  There is also a number, P30N06,
towards the bottom of the case.  I may be wrong, but from following the
circuit, these devices seem to be N-channel.  Although it would be
bennificial to try to track down the cause of the failure, I would like
to try replacing these devices first, if the cost is not high.  I would
greatly appreciate it if anyone can help me find these devices or give me a
cross-ref part number.
73
jeff


From [e-mail] Tue Feb 27 20:10:26 1996
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MOSFET X-Ref: help!
Date: 23 Feb 1996 02:34:04 GMT
Message-ID: <4gj93f$[e-mail]>
References: <4ggmnn$[e-mail]>
To: [e-mail]

Try MTP30N06

Motorola

See the Motorola Power FETs web site for specifications

Tom




From [e-mail] Tue Feb 27 20:10:28 1996
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 source drys up
Date: 20 Feb 1996 23:03:43 GMT
Message-ID: <4gdk0f$[e-mail]>
References: <4gdcou$[e-mail]>

In article <4gdcou$[e-mail]>,
Ben E. Cline <[e-mail]> wrote:
>There was talk here a while back about Digi-Key selling
>NE602s.  They are out of stock now and don't plan to
>restock.  (If someone else has already noted this here,
>sorry for the extra post.)
>
>73, Benjy

Oh no!!!!  At least you can still buy discrete JFETs and bipolar
transistors, build an oscillator, and either build or buy a diode
ring mixer.  If you really want gain in front of the mixer, you
can use another discrete transistor to build a preamp....

;-)

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Tue Feb 27 20:10:29 1996
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 source drys up
Date: Thu, 22 Feb 1996 09:57:07 -0800
Message-ID: <[e-mail]>
References: <4gdcou$[e-mail]> <4gee00$[e-mail]>

One of the reasons the NE602 is unavailable is that higher dynamic range
NE602A units are coming out!  The newer units have larger printed letters
than the older units.  Just how much better the newer units are to be is
a question I have as well!  73  Cliff Buttschardt  W6HDO Morro Bay, CA

On 21 Feb 1996, John Kolb wrote:

> Ben E. Cline ([e-mail]) wrote:
> : There was talk here a while back about Digi-Key selling
> : NE602s.  They are out of stock now and don't plan to
> : restock.  (If someone else has already noted this here,
> : sorry for the extra post.)
>
> I picked up a couple last week at RF Parts, San Marcos CA.
> See ads in QST, etc.
>
>
>


From [e-mail] Tue Feb 27 20:10:30 1996
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 source drys up
Date: Thu, 22 Feb 1996 21:47:03 GMT
Message-ID: <4giobq$[e-mail]>
References: <4gdcou$[e-mail]> <4gee00$[e-mail]> <[e-mail]>

>> Ben E. Cline ([e-mail]) wrote:
>> : There was talk here a while back about Digi-Key selling
>> : NE602s.  They are out of stock now and don't plan to
>> : restock.  (If someone else has already noted this here,
>> : sorry for the extra post.)
>>
>> I picked up a couple last week at RF Parts, San Marcos CA.
>> See ads in QST, etc.

A company here in Scottsdale stocks a great many RF-related ICs and
some transistors, and their customer service is superb.   They're
called DC Electronics, on Scottsdale Road. (I don't have an address or
phone for them here at the office, but they're in directory
assistance.)  By all means get their catalog.  I've bought most of my
NE602s from them, as well as the Motorola RF chips like the MC3362 and
MC2833.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona







From [e-mail] Tue Feb 27 20:10:31 1996
From: [e-mail] (Ben E. Cline)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 source drys up
Date: 22 Feb 1996 18:29:05 GMT
Message-ID: <4giclh$[e-mail]>
References: <4gdk0f$[e-mail]>

In article <4gdk0f$[e-mail]> [e-mail] (Dana Myers)
writes:
> In article <4gdcou$[e-mail]>,
> Ben E. Cline <[e-mail]> wrote:
> >There was talk here a while back about Digi-Key selling
> >NE602s.  They are out of stock now and don't plan to
> >restock.  [snip]
>
> Oh no!!!!  At least you can still buy discrete JFETs and bipolar
> transistors, build an oscillator, and either build or buy a diode
> ring mixer.  If you really want gain in front of the mixer, you
> can use another discrete transistor to build a preamp....
>
> ;-)

Isn't that a lot to ask from a software guy like me who doesn't
always remember which end of the soldering to hold :-).

Benjy
--
Benjy Cline, AC4XO, Ph.D.
Virginia Tech Computing Center
[e-mail]
http://benjy.cc.vt.edu:1951/~benjy/


From [e-mail] Tue Feb 27 20:10:34 1996
From: [e-mail] (Your Name)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need 6.5536 mhz crystal
Date: 21 Feb 1996 14:20:16 GMT
Message-ID: <4gf9n0$[e-mail]>

If you`ll sell one, email [e-mail].  I`ll only pay in cash, must
be in U.S.  No more than $5.

[e-mail]



From [e-mail] Tue Feb 27 20:10:35 1996
From: [e-mail] (DAVE M . SCHERTZER)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need MOD for Kenwood TH251a
Date: 22 Feb 1996 14:33:40 GMT
Message-ID: <4ghus4$[e-mail]>
References: <4g8uep$[e-mail]>

Only mod I have iz...

- Remove diode D416

[e-mail]



From [e-mail] Tue Feb 27 20:10:35 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Recommendation for DSP Design
Date: Thu, 22 Feb 1996 18:45:34 GMT
Message-ID: <[e-mail]>

I need a recommendation for a compact DSP unit for 2.7 KHz Bandwidth SSB
transceiver only. I thought about robbing a Radio Shack unit of the components

needed just for my homebrew application.

Any recommendations for DSP chips which already have the code in them and I
can design around them?

Danny Britton
[e-mail]



From [e-mail] Tue Feb 27 20:10:37 1996
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Recommendation for DSP Design
Date: 25 Feb 1996 16:12:39 GMT
Message-ID: <4gq1pn$[e-mail]>
References: <[e-mail]> <[e-mail]>
To: [e-mail]

Danny:

For audio DSP - the Texas Instruments TMS320C(10,20,30) chips are
the best (IMHO).  There is also a large collection of TMS320
programs and discussion associated with audio filters and other
DSP stuff.  As far as a DSP chip with stuff already in it, I don't
know of any.  You must write a program, assemble and program the
chip.

For assembly, TASM is a freeware assembler that handles the 320 in
addition to other popular uPs.  I believe the EEPROM version of
the TMS320 can be adapted to a 27c256 or simular EEPROM
programmer.  If you really want to get into it, TI offers some
development kits with already assembled boards and PC software to
plug and play you programs for about $100 if I remember correctly.

Hope this helps

73s

de KI5XW



From [e-mail] Tue Feb 27 20:10:38 1996
From: Peter Trapp <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Recommendation for DSP Design
Date: 23 Feb 1996 00:20:46 GMT
Message-ID: <4gj18u$[e-mail]>
References: <[e-mail]>
To: [e-mail]


Is this filter for the audio or receiver's "IF"? If it's for the "IF"
what is the if frequency?
--
******************************************************************
* An explanation should be as simple as possible, but no simpler *
*   -  Albert Einstein                                           *
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*
*      Peter Trapp  [e-mail]                          *
******************************************************************




From [e-mail] Tue Feb 27 20:10:39 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Recommendation for DSP Design
Date: Fri, 23 Feb 1996 12:34:19 GMT
Message-ID: <[e-mail]>
References: <[e-mail]>

In article <[e-mail]> [e-mail] writes:
>Path: stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid
>From: [e-mail]
>Newsgroups: rec.radio.amateur.homebrew
>Subject: Need Recommendation for DSP Design
>Date: Thu, 22 Feb 1996 18:45:34 GMT
>Organization: Oak Ridge National Lab, Oak Ridge, TN
>Lines: 10
>Message-ID: <[e-mail]>
>NNTP-Posting-Host: zaek25.ymd.ornl.gov
>X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]


>I need a recommendation for a compact DSP unit for 2.7 KHz Bandwidth SSB
>transceiver only. I thought about robbing a Radio Shack unit of the component
s
>needed just for my homebrew application.

>Any recommendations for DSP chips which already have the code in them and I
>can design around them?

>Danny Britton
>[e-mail]


Audio DSP

Danny


From [e-mail] Tue Feb 27 20:10:40 1996
From: Neal McEwen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Neel parts to restore old Keys and Bugs
Date: Mon, 19 Feb 1996 21:56:20 -0800
Message-ID: <[e-mail]>

I have several restoration in progress and need parts.  Do you have any
old telegraph keys or bugs lying in around.  I would like to buy what you
have for parts.  Would also be interested in any servicable keys that you
have.  Check out my home page for a list of duplicate keys that I have
for trade.
--
73 de K5RW     - Neal McEwen                    - Richardson, TX (Dallas)
  ******** I collect old telgraph and wireless telegraph keys  *********
HomeNet        - [e-mail]           - OS/2 tcp/ip SLIP
HomePage       - http://fohnix.metronet.com/~nmcewen/k5rw.html


From [e-mail] Tue Feb 27 20:10:41 1996
From: [e-mail] (wayne burdick)
Newsgroups: rec.radio.amateur.homebrew
Subject: new rigs now tested with Wilderness Radio's KC1 keyer/counter
Date: Tue, 20 Feb 1996 11:57:57 -0800
Message-ID: <[e-mail]>

In addition to the list of rigs in the current manual, the KC1 keyer/freq.
counter has now been successfully installed in the following rigs:

"A Small High-Performance CW Transceiver for 20m," Nov'95 QST, by Rick
Campbell, KK7B (installed by Dave, KE6ZBZ)

MFJ 9420 w/CW adapter (Mike, AC6JA)

OHR Explorer I (Tom, WA1GUV)

OHR Explorer II

NorCal Cascade (Rob, WA3ULH)

* * *

The original list of rigs includes:

NorCal 40 (all versions), Sierra (NorCal),  Heathkit HW8 and HW9, SWL
XX-40 (Small Wonders Labs), OHR-400 (Oak Hills Research), and the Gary
Breed transceiver (A&A kits and 624 kits).

* * *

If you know of others not on this list, please send them to me.  I will be
incorporating instructions for all of the new rigs in the next release of
the KC1 manual.

The KC1 is a subminature (2.5 x 0.8") universal Iambic keyer and
displayless frequency counter (3-digit Morse code output) for QRP rigs.
For more info contact Bob Dyer, KC6VIO at 415-494-3806.

73,
Wayne
N6KR


From [e-mail] Tue Feb 27 20:10:42 1996
From: [e-mail] (Clyde)
Newsgroups: rec.radio.amateur.homebrew
Subject: PIN Diode I-V ??
Date: Thu, 22 Feb 1996 11:05:52 GMT
Message-ID: <4gi3v2$[e-mail]>
Reply-To: [e-mail] (Clyde)

Hi guys,
  I'm building an X-band BPSK transmitter and need to know the I-V
characteristics of typical PIN diodes used in a double balanced mixer?
  Altough not elegant, I intend to directly modulate the carrier by
applying the NRZ to the LO port of the double balanced mixer which cost
about $700 each.  Hence, I need to control the drive to stay within
budget.

Thanks in advance, Clyde.



From [e-mail] Tue Feb 27 20:10:43 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (David Stockton)
Subject: Re: PLL loop filter questions and idea
Message-ID: <[e-mail]>
Date: Tue, 20 Feb 1996 17:07:19 GMT
References: <4gaohl$[e-mail]>

Dana Myers ([e-mail]) wrote:


: I'm not familiar with LTC Design Note 7, but I'd guess they're
: using the 4046 in some application other than a radio transmitter
: or receiver local oscillator.


   I've just had a look at LTC DN7 page 2.   I think you're dead right,
Dana.


   Fig D is nice, a scope shot of a rising edge showing about 1us of
jitter at an output freq of 6kHz and a ref freq of 60 Hz.
With an RC filter they show about 30us of jitter.

   OK, that's quite an improvement, but the 4046 VCO is spectacularly
nasty open loop.  Current/voltage/ Capacitor VCOs like RC oscillators
have Q's less than 1

    From the text, the thing seems to be a clock multiplier intended to
drive a tracking switched cap filter - presumably to filter a mains freq
signal.


   Cheers,
          David  GM4ZNX



From [e-mail] Tue Feb 27 20:10:44 1996
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL loop filter questions and idea
Date: 19 Feb 1996 21:02:45 GMT
Message-ID: <4gaohl$[e-mail]>
References: <willmore.823905417@whelk> <4flegc$[e-mail]> <4ga128$[e-mail]>

In article <4ga128$[e-mail]>,
Douglas L. Datwyler <[e-mail]> wrote:
>In article <4flegc$[e-mail]>, [e-mail] says...
>>
>>>Maxim has some nice eighth order switched capacitor filters which could
>>>easily fill this role.  They are clocked at 100 times the highest passed
>>>frequency and are available in the three classic filter topoligies.  It
>>>would be easy to put in a 1MHz clock with a 10x prescaler for a wide
>>>passband and then increase the prescaler value (eight bit counter) when
>>>the PLL has locked.  Would this do what I think and decrease phase noise?

...

>>Don't even think of using switched capacitor filters in PLLs.  There
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>Better tell Linear Technologies Corp. Thieir Design Note 7 utilizes an
>LTC1062, a 5th order, switched-capacitor filter for the loop filter. The note

>shows the jitter of a standard RC filter in a CD4046 loop and a filter built
>with this part. THe jitter is down to internal jitter of VCO (Claimed).

The problem with a switched capacitor PLL loop filter is that the
residual sampling noise of the filter could introduce additional
modulation sidebands in the VCO.  This can be reduced by using an
RC low pass filter following the switched capacitor filter with a
corner much higher than the loop filter corner but lower than the
filter sample rate.  The important question is "what is the application?".

A PLL used for frequency synthesis will be much more stringent than
a PLL used for clock recovery on a data signal or FM demodulation.
If you have modulation sidebands out 1MHz from the synthesizer
frequency that are -60dBc, that may not mean snot to a data recovery
circuit but could wreak havoc in a broadbanded radio transmitter.

I'm not familiar with LTC Design Note 7, but I'd guess they're
using the 4046 in some application other than a radio transmitter
or receiver local oscillator.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From [e-mail] Tue Feb 27 20:10:46 1996
From: Per Stangeland <[e-mail]>
Newsgroups: rec.radio.shortwave,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: Radio Database Program LW, MW, SW coverage for YOU.....
Date: 22 Feb 1996 19:50:43 GMT
Message-ID: <4gihej$[e-mail]>
References: <4gduns$[e-mail]>
To: [e-mail]

Charles Bolland <[e-mail]> wrote:
>FRIENDS,
>
>If you would like a free copy of a radio database program that covers
>longwave, mediumwave, and shortwave with at least 4,000 of records, send
>your NAME, POSTAL ADDRESS, and EMAIL address to chuck@flinet, and I will
>return the program to you via EMAIL.
>
>The program is not up to date!  It is a program used during 1994 and
>hasn't be updated since.  However, many of the records are still current
>for stations that do not change every quarter.
>
>The program is good until June 6, 1996.  After that it will not function.
>
>Hope to hear from you and don't forget your Postal Address for
>registration and future information via mail..
>
>All addresses will be kept confidential!
>
>Chuck
>
>[e-mail]
>
>
My address is:
Per Stangeland
Luftfartsverket
Luftveien 16
N-3440 Royken
Norway.

Best Regards Per



From [e-mail] Tue Feb 27 20:10:46 1996
From: [e-mail](Tim Hynde ka8ddz/qrp Rochester, MI)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Repeater controller speech synth chip?
Date: 21 Feb 1996 13:44:37 GMT
Message-ID: <4gf7k5$[e-mail]>
References: <4ffrl2$[e-mail]> <4fgp6h$719$[e-mail]>

In <4fgp6h$719$[e-mail]> Chris Boone
<[e-mail]> writes:
>
>The typical chips are the Texas Instruments TMS5220 (old series)
>or the TI TMS50C30 (new series) and associated eproms with the
>data in them...
>
>73
>Chris
>

I believe Newark Electronics still sells the National Semiconductor
Digi-Talker Chip along with a development kit for adding more words


From [e-mail] Tue Feb 27 20:10:47 1996
From: [e-mail] (John Kesling)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schematics going to a web page
Date: 22 Feb 1996 06:52:53 GMT
Message-ID: <4gh3s5$[e-mail]>
References: <4faim2$7ll$[e-mail]>

Jay Craswell ([e-mail]) wrote:
: Hi Kerry, there has been a lot of talk about posting schematics on the net.
: Some of the talk has been how (what format) some has been a lot of bandwidth
: of the legalities.  I'm more interested in the how.  In my mind a schematic
: should be in a machine readably format that can be "used".  So not in GIF,
: TIFF etc type "Paint" formats.  Sure you get the info from one place to anot
her
: but if you send me a GIF file of a really neat QRP rig that I want to build
: I start by reentering it from scratch.  Thus I term all paint type files as
: Engineering Napkins.  You know, like in the old days when the CAD operator
: was a draftsman and the engineer was not involved in that stage.  A better
: approach is to use some electronic format that includes the parts, connectio
ns
: and can create a netlist.  One other desired feature is ASCII format so we
: can send it back and forth without UUEncoding etc.  My (highly Jaded) view
: is to use CIRCAD.  It meets all of the above and the program also works with
: OrCAD, Tango, Protel, ACAD and other files.  The demo is free so everyone
: can view files.  The demo also lets you write (aprox 32K) files so we can

I've never heard of the programs mentionied above, are they all DOS/Windows
programs.

I believe any format used should be universal, and not limited to a
particular operating system or machine.  Are all/any of the programs
mentioned above available for DOS, Windows, Mac, Unix, Amiga, etc..
If not DON'T USE 'EM!  There are hundreds of thousands of users on the
internet that have no desire to use MS-DOS or Windows.

If there is no universal format for this kind of information then the
best solution would be to stick to the "universal" graphics formats.
At least we ALL can use them.

: all exchange small files cheaply.  So, thats my 2 cents worth.  Thanks for
: the new WEB Site!
: --
: 73, Jay WB0VNE - AAV5TH

And that's my 2 cents worth.

73 - John - WA8ZGO
--
[e-mail]


From [e-mail] Tue Feb 27 20:10:49 1996
From: [e-mail] (Mike Addlesee)
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Simulating old valves/tubes with FETs
Date: 22 Feb 1996 17:58:32 GMT
Distribution: world
Message-ID: <4gias8$[e-mail]>


--
I am looking for advice on FET based equivalent circuits to replace
old valves/tubes. In particular I have a National HRO-M which uses
several 6C6. What are the most important characteristics that need
to be reproduced?
-------------
Mike Addlesee


From [e-mail] Tue Feb 27 20:10:50 1996
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
From: [e-mail] (David Stockton)
Subject: Re: Simulating old valves/tubes with FETs
Message-ID: <[e-mail]>
Date: Fri, 23 Feb 1996 09:42:43 GMT
References: <4gias8$[e-mail]>

Mike Addlesee ([e-mail]) wrote:

: --
: I am looking for advice on FET based equivalent circuits to replace
: old valves/tubes. In particular I have a National HRO-M which uses
: several 6C6. What are the most important characteristics that need
: to be reproduced?


     There were various fet based valve replacements, but they never
equalled the originals.  Those valves ran appreciable amounts of anode
power and so gave quite remarkable dynamic range. Designing a
semiconductor circuit to fully equal a bottle in the same impedence
environment would be a major undertaking. Power VMOS fets can do the
power, but have electrode capacitances much too large to be absorbed by
adjusting the coupling circuits.

    You could make the think work with Jfet-bipolar cascodes, but you'll
lose the wonderful linearity of the HRO.

   Sorry,
         David  GM4ZNX


From [e-mail] Tue Feb 27 20:10:51 1996
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tunnel diodes: are they any good? If so, any circuits out there?
Date: Wed, 21 Feb 1996 20:51:20 -0700
Message-ID: <[e-mail]>
References: <4gb2jb$[e-mail]> <4gflu3$[e-mail]>

Somewhere in my collection I have an FM receiver that used a tunnel
diode as a local oscillator and mixer. I believe the circuit came from
the RCA tunnel diode handbook, but I forget.  The IF was roughly 300 kHz
and used about 4 stages of 2N1308 current switching pairs as limiters.
The detector was a pulse averaging circuit.  A one shot fired with a
fixed width pulse at every zero crossing and the audio was obtained by
passing the pulse through a low pass filter.  It actually worked pretty
well considering tthat it only had one inductor in the whole thing.  I
do remember that it was susceptible to interference from AM stations idf
the antenna lead got too long.  I just used the classic twin-lead folded
dipole tacked to the wall.  It was the source of background music in an
electronics lab I worked in circa 1963.

de K9GXC, Jim

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


From [e-mail] Tue Feb 27 20:10:52 1996
From: Peter Trapp <[e-mail]@digital.net>
Newsgroups: rec.radio.amateur.homebrew
Subject: upd7800 Dinosaur
Date: 21 Feb 1996 19:34:34 GMT
Message-ID: <4gfs4a$[e-mail]>

I am in need of a crossassembler for the NEC upd7800 microprocessor
ie: ASM87-D52 no longer avaliable from NEC. Or, an op-code instruction
set listing. Any help or advice you could offer would be greatly
appreciated.

--
******************************************************************
*      Peter Trapp (KD4CN)   [e-mail]                 *
******************************************************************




From [e-mail] Tue Feb 27 20:10:52 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: VCO question : 100 KHz deviation capability is it enough for 75KHz operation ?
Date: Sat, 24 Feb 1996 10:15:59 GMT
Message-ID: <4gmooj$[e-mail]>

Hi,

I plan to use a hybrid VCO with 100KHz deviation capability
(information from manufacturer). I design a stereo FM emetter and I
need 75KHz deviation.

Is it enough or do I choose a  VCO with wider deviation ? Is this
important for signal quality and purity ?

Regards


Have
a nice                    [e-mail]
Day



From [e-mail] Tue Feb 27 20:10:53 1996
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VHF LO Parasitic--common?
Date: Mon, 26 Feb 1996 12:04:53 -0700
Message-ID: <[e-mail]>
References: <[e-mail]>

I have not seen this phenomena, but it is very likely with high
multiplication ratios to see a component at the crystal fundamental
frequency.  This can be annoying also.  I once had to add a high Q
resonant filter after a VCXO source at 425 MHz to keep the fundamental
component from getting into a wideband modulator.

de K9GXC, Jim

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


From [e-mail] Tue Feb 27 20:10:54 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted 12 Volt 4 pin vibrator
Date: 23 Feb 1996 02:10:49 GMT
Message-ID: <4gj7n9$[e-mail]>
Reply-To: [e-mail]

I came across an old Terado 12 DC to 110 AC Inverter. I believe any 4 pin (2 b
ig,
2 smaller) 12 volt vibrator will switch it. Anybody got a lead on where I migh
t find
one?
                 [e-mail]  aka WD9AHF


From [e-mail] Tue Feb 27 20:10:55 1996
Date: Sat, 24 Feb 1996 15:59:55 +01
From: Bob Mueller <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted-DEAD! HP(8)478A Thermistor Mount

If anyone has a next to useless, burned-out, thermistor mount of the above
or similar types, I would like to buy it as "Raw material" if your price
matches the state of the head.  Also, coaxial thermal heads of other sorts
(No based on thermistors) would be interesting, even if dead.

          Bob<iff161@djukfa11>


From [e-mail] Tue Feb 27 20:10:56 1996
From: [e-mail] (ML, Michigan, USA)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: ICOM T21A & IC-2000H mods
Date: Mon, 26 Feb 96 13:35:14 GMT
Message-ID: <4gsd01$[e-mail]>

Please email mods to [e-mail].  Thanks!

73, KB8VBA


From [e-mail] Tue Feb 27 20:10:56 1996
From: [e-mail] (ML, Michigan, USA)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: ICOM T21A & IC-2000H mods
Date: Tue, 27 Feb 96 13:52:07 GMT
Message-ID: <4gv2bp$[e-mail]>

Please email mods to [e-mail].  Thanks!

73, KB8VBA


From [e-mail] Tue Feb 27 20:10:58 1996
From: [e-mail] (James M. Atkinson, Communications Engineer)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Wiretapping and Telephone Bugging Web Page tscm.com
Date: Sun, 25 Feb 1996 15:34:56 -0500
Message-ID: <[e-mail]>
Reply-To: [e-mail]
Keywords: Counterintelligence Debugging Surveillance Counter-Terrorism

Finally the tools and test equipment page is finished, and we have updated
our frequency tables/lists.

Check out our updated tool and TSCM test equipment list.

http://www.tscm.com/

http://www.tscm.com/tmde.html    <--- TSCM Test Equipment
http://www.tscm.com/tools.html   <--- TSCM Hand Tools
http://www.tscm.com/stu.html     <--- Secure Telephones and Scramblers

Upcoming Topics to watch for in March... Any interest??

   Wired Microphones and Pinhole devices... tons of pictures
   The Computer Audio/Video Threat... tons of pictures
   Join us for a real world TSCM sweep...

   Feel free to suggest topics...
 ===============================================================
    James M. Atkinson          "...Shaken, not Stirred..."
    TSCM.COM
    127 Eastern Avenue #291
    Gloucester, MA 01931-8008
    URL: http://www.tscm.com/      E-Mail:  [e-mail]
 ===============================================================
    The First, The Largest, The Most Popular, and the Most
    Complete TSCM Counterintelligence Site on the Internet
 ===============================================================



From [e-mail] Tue Feb 27 20:10:59 1996
From: Jim Strohm <Jim Strohm@ausq1ak>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB 6,000 watt linear amp 75 meters
Date: 22 Feb 1996 13:10:11 GMT
Message-ID: <4ghpvj$[e-mail]>
References: <4g8dri$[e-mail]> <4g9p8k$[e-mail]> <4gf9co$[e-mail]>

I'm surprised that nobody has suggested AM broadcast surplus as a good
source for 160 meter amplifiers.

Check out a copy of Radio News.  You'll pay a bunch for a working unit,
but you may also get a line on a "fixer-upper" that's not quite
good enough any more to run 8760 hours a year.

If you can wind 1/4" copper tube around an oatmeal box, you can convert
an FM broadcast transmitter to 160....

N6OTQ
Flame me now and avoid the rush!




From [e-mail] Fri Mar 01 21:06:12 1996
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Simulating old valves/tubes with FETs
Date: Thu, 22 Feb 96 23:33:54 GMT
Distribution: world
Message-ID: <[e-mail]>
References: <4gias8$[e-mail]>
Reply-To: [e-mail]

In article <4gias8$[e-mail]>
           [e-mail] "Mike Addlesee" writes:

> I am looking for advice on FET based equivalent circuits to replace
> old valves/tubes. In particular I have a National HRO-M which uses
> several 6C6. What are the most important characteristics that need
> to be reproduced?

I think that QST had something on this over 20 years ago. People used to
remove the glass envelope from the valve base, and the electrodes, and
wire a couple of JFETs, Rs and Cs across the pins in a cascode
configuration. In many cases the replacement 'valve' worked just as well
as the glass variety, and didn't need any other component changes. At
least one company actually manufactured such devices.

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] Fri Mar 01 21:06:13 1996
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: tunnel diodes, to Dave Moorman...
Date: 23 Feb 1996 19:16:10 GMT
Message-ID: <4gl3pq$[e-mail]>

Dave, K9SW:  I have lost your e-mail address; please resend it.

Bruce


From [e-mail] Fri Mar 01 21:06:14 1996
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 49 mhz to 6 meter conversion
Date: Fri, 23 Feb 1996 21:36:37 GMT
Message-ID: <4glc68$[e-mail]>
References: <4gjsnu$[e-mail]>

[e-mail] (David Lawson) wrote:

>I have recently read an article in the Boston Amateur radio club archives
>about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter
>tranciever with a 1 repeater coverage. Does anyone know why this shouldnt
>work with a simple crystal change? Has anyone done it? It might become my
>next project.

The only place you might trip up is not having enough "travel" on any
of the little can coils to bring resonance up by the 2-3 Mhz it might
take.  Some of the cheapies use "naked" wire coils that you can spread
out to reduce inductance, but it's not an exact science and make take
some futzing.

You might give it a shot and let us know how you do.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona




From [e-mail] Fri Mar 01 21:06:15 1996
From: [e-mail] (David Shore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrew GPS RX
Date: Sat, 24 Feb 1996 00:28:57 -0800
Message-ID: <[e-mail]>
References: <[e-mail]>

Hello, I wrote the original post about a homebuilt GPS. I can't find the
backlogs of the UKW berichte journal anywhere on the i-net. Is there any
more detailed information you can give me about this article?

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

> About 2 years ago there was a very detailed description of a
> homebuilt GPS Rx in the german journal UKW-Berichte.
> It went over several issues and if I remember correctly there were
> detailed schematics.
> The author was a very wellknown Yougoslawian amateur.
> The article was in the german language.
> Hope this helps
>
> Dietrich DJ1VA
>
> NB.: The rx was also suitable for GLONASS.

--
*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#

David and Dick Shore are very involved in computers and multimedia. David is w
orking on designing robots, advertising, and programming, and Dick is excellen
t on 3-D modelling programs, animations, and other computer art.


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Version: 2.6

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Thank you for whatever we discussed!
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$


From [e-mail] Fri Mar 01 21:06:16 1996
Newsgroups: rec.radio.amateur.homebrew
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: MOSFET X-Ref: help!
Message-ID: <[e-mail]>
To: [e-mail]
References: <4ggmnn$[e-mail]>
Date: Sat, 24 Feb 1996 00:30:09 GMT

These are SGS Thompson power Mosfets.  You can replace with National
Semi NDP4060, or Motorola MTP30n06.  They are 30A, 60 Volt devices and
should be available from Digikey at 1-800-344-4539.  I think they have a
web home page too.
Regards, Al
(Marketing manager for discrete transistors including the NDP4060)




From [e-mail] Fri Mar 01 21:06:17 1996
Newsgroups: rec.radio.amateur.homebrew
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Help with Heath VTVM!!!!
Message-ID: <[e-mail]>
To: [e-mail]
References: <4gj9k5$[e-mail]>
Date: Sat, 24 Feb 1996 00:33:26 GMT

I've had no problem with mine in 20 years.  Use a standard zinc-carbon
battery to calibrate it.  Alkalines have slightly different voltages. If
I remember correctly, you CAL to a red mark on the meter. (I'm not at
home where the meter is.)
Regards, Al




From [e-mail] Fri Mar 01 21:06:19 1996
From: [e-mail] (Steve Shumway )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Iron -on Transfers
Date: 25 Feb 1996 02:20:55 GMT
Message-ID: <4goh27$[e-mail]>
References: <4gnhnb$[e-mail]>

In <4gnhnb$[e-mail]> [e-mail] (John Caramatti)
writes:
>
>Has anyone had any good results using the Iron-on and peel transfer
>papers.  I believe it's call PnP Blue by a company called Techniks
>Inc. If you have had experience please pass on any tips you may have.
>
>Thanls,  John
>

John,

I have nothing but good things to say about PnP Blue.

I had some initial missgivings about it, because I had previously tried
to use normal overhead transpanancy film to build a printed circuit
board. This was a total failure.

The difference is: the PnP Blue "film" has a coating of (big surprise)
blue "stuff". This blue stuff adhears to the toner (from the laser
printer, or photo copier) and adds resilience to the resist once it is
stuck to the
 Cu.

A couple of tricks:


1) Make sure that the board is absolutly CLEAN.

2) Make sure that the board is absolutly CLEAN!

Even one finger print will cause the resist to transfer improperly. I
finaly used a laquer thinner to get the board to that final level of
clean (while wearing latex gloves).

Another problem that I've had is that registration of a double sided
board can be a bit tuff. Don't give up, it can be done.


Several things I DON'T know:

I have not as of this writing:

  Tried to produce a board which had traces smaller than 24 mills.

  Tried to run a trace between the pins of a 100 mill center component.

On the whole, I am very happy with PnP Blue. I recomend it for small
runs of PC boards with the above provisions.


Good luck


Steve Shumway
N8SHP
[e-mail]



From [e-mail] Fri Mar 01 21:06:20 1996
From: [e-mail] (JohnsonHE)
Newsgroups: rec.radio.amateur.homebrew
Subject: McCoy filters
Date: 25 Feb 1996 10:40:11 -0500
Message-ID: <4gpvsr$[e-mail]>
Reply-To: [e-mail] (JohnsonHE)

Wanted to buy...McCoy Silver Sentinel or Golden Guardian crystal lattice
filters.

Send response to [e-mail]


From [e-mail] Fri Mar 01 21:06:21 1996
From: Max Lock <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ### KISS on a Baycom?
Date: Sun, 25 Feb 1996 15:41:46 +0000
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>


 Hi there,

 Nope, as far as I know, theres no way possible to "do" a baycom on
Linux, beacause it's a multithreaded OS. Baycom relies on interrupts to
it's native DOS environment, and the Linux system has no way to this.

 I think i'm on the right path here, corect me if I'm wrong :)

 Max. G7UOZ & Linux fan.

--
         /_/_/      University of Hertfordshire ARS.     ______
        / /|/                                           /      \
 Callsign: G7UOZ - TCP/IP: 44.131.166.25 - AX25: [e-mail]
 WWW: HTTP://147.197.131.75/~g7uoz/g7uoz.html -  E-MAIL: [e-mail]
           |____________________________________________|______|



From [e-mail] Fri Mar 01 21:06:22 1996
From: David Nulton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Simulating old valves/tubes with FETs
Date: 25 Feb 1996 16:05:22 GMT
Message-ID: <4gq1c2$[e-mail]>
References: <4gias8$[e-mail]> <[e-mail]>
To: [e-mail]

Mike:

The only thing I've heard of in terms of reproducing valve effects
with semiconductor equivalents has been in the music business.  In
that case, musicians want to duplicate the harmonic
characteristics and compression of tubes.  A man named Eric
Pritchard had built a device the do just that.  However most of
his tubes are geared toward audio, particlarly the medium mu tubes
like 12ax7s and at7s.  He may have some 6L6 or EL34 type tubes.

This probably doesn't help, but if so, mail me and I can get you
in touch with Mr. Pritchard.

73s
de KI5XW



From [e-mail] Fri Mar 01 21:06:22 1996
From: [e-mail] (CraigIvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: FM-10 question
Date: 25 Feb 1996 18:36:21 -0500
Message-ID: <4gqrpl$[e-mail]>
Reply-To: [e-mail] (CraigIvey)

I have a FM-10 (rev. F) that drifts.  I read in the FM-10 FAQ that the
frequency selecting capacitor can be swapped out with a more stable one
(tantalum, silver mica, polystyren).  Also the diodes can be swapped out
with a zener diode.

What type of capacitor and zener diode do I need to get and where can I
get it?

[e-mail]


From [e-mail] Fri Mar 01 21:06:23 1996
From: [e-mail]    (Bill Newkirk)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: DS-1A (DC-DC converter for Kenwood) question
Date: 25 Feb 1996 22:01:38 GMT
Message-ID: <4gqm82$[e-mail]>
References: <4ft09j$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Bill Newkirk)

In <[e-mail]>, [e-mail] (charles copeland) wri
tes:
>In article <4ft09j$[e-mail]>,
>Ken Edwards <[e-mail]> wrote:
>>I have a Kenwood TS-820S that I would like to run off battery in

ts-820...about 160 W input...pulls about 20A at 12 V..

>I've looked into this also for my TS-820. The box that connects
>to the TS-820 that allows DC operation only contains a two resistors
>and two mega transistors.

sounds something like the supply used in the TS-520..

>The transistors are no longer in production, but the equivalent
>is ZN4049, PNP germanium, 60A, 45V, TO-36, NTE28 at the tune
>of $45 each. Thats $90 a pair. Not a pretty picture.
>
>I think it would be more feasible to buy a DC to AC converter for
>your cigarette lighter plug and drive the TS-820 with 120VAC.
>I would be interested in anyones experience doing this.

i don't think the lighter can supply enough current for transmit.

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] Fri Mar 01 21:06:25 1996
From: [e-mail](Tim Hynde ka8ddz/qrp Rochester, MI)
Newsgroups: rec.radio.amateur.homebrew
Subject: 15 pin video on laptop - Help
Date: 25 Feb 1996 22:46:09 GMT
Message-ID: <4gqorh$[e-mail]>



I've got an old laptop (386) Im going to dedicate to the ham shack,
mostly to run Hamcomm, Baycomm, and perhaps JVFAX. It has a 15 pin
output for a VGA monitor, since everything I'm running is CGA and even
then, mostly text based I want to use an amber monitor pulled out of a
terminal.(It has a really nice color to it) As best I can tell there
are 3 inputs to the monitor for horz,vert, and video. (I may not have
those terms correct but I know they are the minimum nessesary) I've
successfully connected it to an old Sinclair Z-80, but dont want to
blow the video out of the laptop.

Any suggestions on which pins will provide the nessesary signals. I'm
just not up on the types of signals comming from the 15 pin video out.
(Can I mix RBG all together on the same pin to drive monochrome?)

Thanks for any and all input.

73, Tim
>ka8ddz




From [e-mail] Fri Mar 01 21:06:26 1996
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.scanner,rec.radio.shortwave
Subject: Free classified Ads at Ham Radio Online
Date: 26 Feb 1996 04:33:49 GMT
Message-ID: <4grd7d$[e-mail]>

We've added free "classified" ads to our freeware Ham Radio Online
international "magazine" web site. We also have original feature stories,
international ham radio newsletters, broadcast/SWL info, REAL-TIME world-wide
propagation resources including MUFs, aurora, geomagnetic field conditions and
tons more stuff.

The March stories will begin by the end of the coming weekend. Stop on by
and check out the new Ham Radio Online Interactive section - where you can
add your own messages and your own ads, DX announcements, VHF band openings
or whatever.

Please enjoy,
73, Ed, KF7VY

------------------------
personal email to [e-mail]
Visit Ham Radio Online, it's free, at
http://www.accessone.com/~vbook/hronline.htm



From [e-mail] Fri Mar 01 21:06:27 1996
From: [e-mail] (Mike)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Recommendation for DSP Design
Date: 26 Feb 1996 05:50:30 GMT
Message-ID: <4grhn6$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>, [e-mail] says...
>
>I need a recommendation for a compact DSP unit for 2.7 KHz Bandwidth SSB
>transceiver only. I thought about robbing a Radio Shack unit of the
components
>needed just for my homebrew application.
>
>Any recommendations for DSP chips which already have the code in them
and I
>can design around them?
>
>Danny Britton
>[e-mail]
>

It really depends on the application you are planning in your tranceiver.
I use the Ti Tms320C50 DSK for some voice applications but it is crippled
by the slow sample rate analog interface. It is priced at $99.00 and
includes a simple assembler and debugger. Although the price is fair the
Motorola 56002EVM is a better deal at about $150.00.  This is a 24 bit
processor running at 50Mhz with the Crystal semi. analog interface. It
samples up to 48khz opposed to 19khz (I think for the Ti). It comes with
a nice assembler with a lot of internal functions and the Domain
Tech. Debugger. I have sent requests for help to both companies and only
got answers to them from Motorola. The Motorola is also stereo which
probably won't effect your application. The Ti's interface with the host
computer is a very simple one and not nearly as nice as the 56002EVM.
Ti does have an EVM for the C50 also but I don't think it will compete in
price with the 56002 because I got a $100.00 coupon toward it with the
dsk and you normally don't get a 100 dollar coupon for a 150 dollar item.

The Analog Devices starter kit is also priced low but when I checked out
their dsp products you had to buy the reference books from a 3'rd party
and Ti and Motorola books are free for the asking.




From [e-mail] Fri Mar 01 21:06:28 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Iron -on Transfers
Date: Mon, 26 Feb 96 09:30:29 PDT
Message-ID: <[e-mail]>
References: <4gnhnb$[e-mail]>  <4goh27$[e-mail]>


>
> Another problem that I've had is that registration of a double sided
> board can be a bit tuff. Don't give up, it can be done.
>
>
The standard technique for double sided boards is to tape both the top
and bottom films (transfer films with pattern on them) to a piece of
pcb material so that the pattern on the films is off the edge of pcb
material..  When taping the second film onto the pcb material
carefully align the two layers.  Then simply slide the pcb material
that you want to etch between the two films and butt upto the other
piece of material.  For extra safety in handling, you can then tape
the films to the work piece.  This method works well for photo
exposure but should work equally well for dry transfer.

Jay




From [e-mail] Fri Mar 01 21:06:29 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Need Recommendation for DSP Design
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]> <[e-mail]> <4gq1pn$[e-mail]>
Date: Mon, 26 Feb 1996 15:11:37 GMT

In article <4gq1pn$[e-mail]> David Nulton <[e-mail]> writes
:
>For audio DSP - the Texas Instruments TMS320C(10,20,30) chips are
>the best (IMHO).  There is also a large collection of TMS320
>programs and discussion associated with audio filters and other
>DSP stuff.  As far as a DSP chip with stuff already in it, I don't
>know of any.  You must write a program, assemble and program the
>chip.
>
>For assembly, TASM is a freeware assembler that handles the 320 in
>addition to other popular uPs.  I believe the EEPROM version of
>the TMS320 can be adapted to a 27c256 or simular EEPROM
>programmer.  If you really want to get into it, TI offers some
>development kits with already assembled boards and PC software to
>plug and play you programs for about $100 if I remember correctly.

The TI chip is good, but I think the Analog Devices chipset is
even better, and the development kit is $89. (As a bonus, this
chipset is used on some soundcards for the PC, which is really
convienent if you're doing a demodulator for digital data or
an audio spectrum analyzer or FAX or SSTV or whatever, and will
be interfacing to a PC anyway.)

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 Mar 01 21:06:30 1996
From: "joseph c. hawkins" <claven.den.mmc.com>
Newsgroups: rec.radio.amateur.homebrew
Subject: Pager Problems
Date: 26 Feb 1996 17:21:32 GMT
Message-ID: <4gsq6s$[e-mail]>

Does anyone have any info (schematics) on Pagecom or Minitor II pagers?
Our Vol service has several in need of repair and any info would be
appreciated.

Thanks
Joe




From [e-mail] Fri Mar 01 21:06:31 1996
From: Steve Benkoski <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 813 Xmtr for 160M
Date: Mon, 26 Feb 1996 18:09:29 -0500
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>

Brian Carling wrote:
>
> From: [e-mail]
> "mail sometimes bounces here, please resend if needed!"
>
> I once had an ART-13 - got it free at a hamfest, built a 28V DC supply
> for the autotune and put it on the air! Had a ball with it!
>
> FAIR RADIO is listed in my file MEGALIST.TXT aka MEGALIST.ZIP
> available as follows:
>
> Updated copies downloadable from BBSes at:
> [phone], [phone], [phone],  [phone]
> [phone], [phone], [phone]
>
> FTP site is at ftp.Lehigh.EDU.  Login as anonymous, and use your
> e-mail address as the password.
> FTP:  ftp://ftp.lehigh.edu/pub/listserv/qrp-l/misc/megalist.txt
> WWW: http://qrp.cc.nd.edu/QRP-L/index.html
> WWW: http://www.nd.edu/~shideg/
>
> megalist.txt
> manuals.txt
> dealers.txt
> tubes.txt
> xtals.txt
> ========
>
> LD>> Fair Radio in Lima Ohio has the ART-13 available in surplus again for $
150
> LD>It covers 2-18 Mhz
> LD>> (and is easily re-worked for 160 thru 10 meters) and uses an 813 modula
ted
> LD>with a pair of
> LD>> 811's. You might have more fun rebuilding the ART if you just want to r
un
> LD>the 813's!
>
> LD>Hey, I had one of these things many years ago.  Watching the autotune
> LD>operate is more fun than a barrel of monkeys.  What's the address for
> LD>Fair Radio?
>
> LD>Larry                                 *************************
>
> The Evolution of Contemporary Thought:
>
> ---->   McHale's Navy ->
> ->  Mikhail Gorbachev ->
> ---------->   Al Gore ->
> ------->   Gore Vidal ->
> ---->   Vidal Sassoon........
>
> A natural progression!
>
> ---
>  ■ SLMR 2.1a ■Hey, I managed to get 7 ART-13A's! 5 of them in near mint cond
ition,two
of them for parts. Also have a DRAKE 110vac power supply for the
ART-13A. I will trade of 3 of the nice ones in exchange for more old HF
stuff. Any takers?
                    Mark Foltarz KA4JVY


From [e-mail] Fri Mar 01 21:06:32 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Charles Hoffman)
Subject: Re: Need Globar Resistor Info
Message-ID: <[e-mail]>
Date: Mon, 26 Feb 1996 18:25:23 GMT
Reply-To: choffman @pelican.davlin.net
References: <[e-mail]>

You should contact The Carborundum Company, Electric Products
Division, Box 664, Niagara Falls, NY 14302;
phone [phone] or fax ...2298.

Note, there are hundreds of types of non inductive resistors, so you
will no doubt need to have some specific applications in mind as you
persue information; otherwise you may get burried!
73
Ric K5SBU


[e-mail] (Jack Giehl) wrote:

>Hi,

>I am looking for a supplier or an address/phone number for
>Globar resistors.

>Thanks, Jack, WB8BFS





From [e-mail] Fri Mar 01 21:06:34 1996
From: [e-mail] (Nigel Davison)
Newsgroups: rec.radio.amateur.homebrew
Subject: Necessary Bandwidth
Date: Mon, 26 Feb 1996 20:57:26 GMT
Message-ID: <[e-mail]>

Hi,

Can somebody explain to me exactly what is meant by necessary
bandwidth and how it is calculated,  or is it just another way of
expressing the conventional 3dB bandwidth?.

My understanding is that it is the necessary bandwidth required to
enable satisfactory reception of a modulated signal.  If this is so
then is there an equation to calculate it?.


Thanks

Nigel



From [e-mail] Fri Mar 01 21:06:34 1996
From: Roger L Traylor <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Plessey SL6440 - near end of life?
Date: 27 Feb 1996 01:45:38 GMT
Message-ID: <4gtno2$[e-mail]>

I have heard that the SL6440 balanced mixer made by GEC Plessey is to
be discontinued soon.  Has anybody heard any statement or rumor to
this effect?

Any suggestions for a replacement in the future?

Thanks,

Roger Traylor
WB4TPW


From [e-mail] Fri Mar 01 21:06:35 1996
From: [e-mail]
Newsgroups: sci.astro.amateur,rec.radio.amateur.space,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.antenna
Subject: [Q] Frequency of Jupitor emissions
Date: Tue, 27 Feb 96 13:51:35 PDT
Message-ID: <[e-mail]>


Hi All:

Anyone know what frequence emissions from Jupitor may
be picked up on. Also, is there equipment that can
be bought or built cheaply to do such. As I recall I thought
I saw mentioned in a trade rag 18Mhz - 22Mhz...

Thanks,

Gary-



From [e-mail] Fri Mar 01 21:06:36 1996
From: [e-mail] (Terry LaBrier)
Newsgroups: rec.radio.amateur.homebrew
Subject: Site for Mods
Date: Tue, 27 Feb 1996 14:34:54 GMT
Message-ID: <4gv6ua$[e-mail]>

Once, while surfing the Ham Radio Sites, I ran across a site for Mods
for Kenwoods, etc.  I have lost that site.  I would appreicate knowing
what sites may be out there for mods to ICOMS and Kenwoods.  Thanks
and 73.
Terry

***************************
* Terry LaBrier, N0AHY    *
* [e-mail] *
***************************



From [e-mail] Fri Mar 01 21:06:37 1996
From: [e-mail] (Scott Arnold)
Newsgroups: rec.radio.amateur.homebrew
Subject: 11 to 6 Meter??
Date: Tue, 27 Feb 96 15:58:44 GMT
Message-ID: <4gv9if$[e-mail]>

Anyone know if it's possible to convert CB's to 6 meters?  And if so, some
examples of model numbers and where the surgical information may be obtained
in order to do so.

Many thanks.
Scott
VE1CSA




C. Scott Arnold
New Brunswick Department Of Education
Technical Support   [e-mail]  [phone]
**OPINIONS EXPRESSED IN THIS MAIL ARE MINE, NOT MY EMPLOYERS'**


From [e-mail] Fri Mar 01 21:06:39 1996
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 11 to 6 Meter??
Date: Tue, 27 Feb 1996 16:39:36 -0700
Message-ID: <[e-mail]>
References: <4gv9if$[e-mail]>
To: Scott Arnold <[e-mail]>

Years ago I converted a Gemtronics 23-channel SSB CB to 6 meters.  I had
the SAMS manual and thus could calculate the necessary crystal to
provide a mix to 50 MHZ.  I only installed 1, giving me 4 channels of 50
MHZ starting at 50.100, ch2 50.110, ch3 50.120, and ch4 50.140.
I had to solder the crystal directly to the PC board close to the
oscillator transistor instead of the normal crystal socket to get it to
oscillate.  Transmitter tuneup consisted of replacing the capacitors in
the output circuit with 50% or smaller values, and as I recall a couple
of stages tuned up best with the parallel capacitors removed altogether.
Also seems like I had to rework at least 2 or 3 coils in the recv
circuits, RF preamp and 1st mixer, using an exacto knife to remove the
tiny caps imbedded in the base of the plastic coil forms inside the
cans, perhaps removing a few turns of wire from the coils too.  It
wasn't a trivial project but the cost in bucks was VERY low, the rig is
still operational 10-15 yrs later (loaned out to a more active 6M ham
now) but time involved was the big cost.  If I was to do it again I
think I'd try the external transverter approach (such as the Hamtronics
80 dollar kit) instead.  I am not the only nut to have done this;  I
worked another 6M ham once with it who was running a similar CB rig!
Power output was close to 5 watts SSB when I got thru with it;  the
receiver was not quite so hot and required the addition of a 40673-style
preamp to get the sensitivity up to acceptable levels.
I submitted an article to all the ham mags at the time (early
'80's) about the project but evidently they all thought it too involved
too and rejected it.  I think I could find the unpublished article in my
files if you decided you really wanted to tackle the job.
I think it would be best to attempt it on one of the older simpler rigs.
 If I had a more modern "sympathized" CB rig I would sure think the best
way would be to use an external transverter.
--
|-------------------------------------------------------|
|Jim Devenport   WB5AOX                                 |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|HTTP://nis-www.lanl.gov/~jdport/                       |
|-------------------------------------------------------|


From [e-mail] Fri Mar 01 21:06:40 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: re: Homebrew GPS RX
Date: 27 Feb 96 16:47:54 GMT
Message-ID: <[e-mail]>

In an earlier article David Shore asked:

> Hello, I wrote the original post about a homebuilt GPS. I can't find
> the backlogs of the UKW berichte journal anywhere on the i-net.
> Is there any more detailed information you can give me about this
> article?

I've never heard of UKW-Berichte being on the net (anybody? Ich
spreche wenig Deutsch...), but the international edition, VHF
Communications, is very much on the net. Visit:

   http://www.taynet.co.uk/~gdx/ag/vhfcomm.htm

The full title of the series of articles is "A DIY Receiver for GPS
and GLONASS Satellites". Say hi to Mike. Subscribe (Americans do it
through ATV Quarterly) - it's a neat magazine!

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] Fri Mar 01 21:06:41 1996
From: Dave Booth <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Site for Mods
Date: Tue, 27 Feb 1996 17:54:33 -0800
Message-ID: <[e-mail]>
References: <4gv6ua$[e-mail]>
To: Terry LaBrier <[e-mail]>

Terry LaBrier wrote:
>
> Once, while surfing the Ham Radio Sites, I ran across a site for Mods
> for Kenwoods, etc.  I have lost that site.  I would appreicate knowing
> what sites may be out there for mods to ICOMS and Kenwoods.  Thanks
> and 73.
> Terry
>
> ***************************
> * Terry LaBrier, N0AHY    *
> * [e-mail] *
> ***************************

here is the sight you prob were in.....

http://oak.oakland.edu:8080/pub/hamradio
it's the best i've seen... 73 de dave booth. kc6wfs

http://www.lookup.com/Homepages/65348/home.html


From [e-mail] Fri Mar 01 21:06:42 1996
From: [e-mail] (Stan Korzep)
Newsgroups: rec.radio.amateur.homebrew
Subject: TM231: where is memory battery?
Date: 28 Feb 1996 00:41:34 GMT
Message-ID: <4h08bu$[e-mail]>

Does anyone know where inside the Kenwood TM231A 2 meter transciever
the battery used for memory power is located?

Appreciate any help and any suggestions on how to remove front PC board
if battery is located on that board.

Stan
[e-mail]


From [e-mail] Fri Mar 01 21:06:43 1996
From: [e-mail] (Joe Fishbein)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where to find RF Chokes?
Date: Wed, 28 Feb 1996 03:07:06 GMT
Message-ID: <4h0g1l$[e-mail]>
References: <4gsjqb$[e-mail]>
Reply-To: [e-mail]

[e-mail] (Greg Snellgrove) wrote:

>I am building a 50s/60s vintage tube-type cw transmitter and after a long
>hard parts search, I finally have all the parts I need except for the rf
>chokes. I have called everywhere I knoe to call and have not had any
>luck. What I need is 1 1.0mH RFC such as a Miller 4652-E and 2 2.5 mH
>RFCs such as the Miller 4666-E. I have found out that these are still
>being made by Miller, but the best source I have found so far would have
>to order me 25 of each at $3.90 a piece! There has to be someplace to buy
>small quantities of these. Any source you know of would be greatly
>appreciated.

Ocean State Electronics has the 4666 in their catalog, priced at $4.30
each.  They don't show the 4652, but you might call them and see if
they carry it.

They also carry the Miller 70F- series of RF chokes, priced from $1.10
to $3.55 each, depending on inductance.

Ocean State Electronics
PO Box 1458
Westerley, RI  02891

[phone]  or 1-800-866-6626 (order line)
[phone] fax

Hope this helps.

73s,

Joe Fishbein  WD9GRK
[e-mail]




From [e-mail] Fri Mar 01 21:06:44 1996
From: "David W. Knisely" <[e-mail]>
Newsgroups: sci.astro.amateur,rec.radio.amateur.space,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.antenna
Subject: Re: [Q] Frequency of Jupitor emissions
Date: 28 Feb 1996 05:49:22 GMT
Message-ID: <4h0qd2$[e-mail]>
References: <[e-mail]>
To: [e-mail]

Hi there.  The Decameter radio bursts do not stay on a particular frequency.
They
are quite broad banded and move in frequency as time goes on.  22 Mhz is a goo
d
place to look, but it also has some broadcast stations on when the ionosphere
is
refractive to those freqencies.  It is best heard on a broad band AM shortwave

receiver with a directional antenna (like a Yagi or a loop) pointed at Jupiter
.  The
emissions are very irregular, and seem to be most often observed when the moon
 IO is
in certain positions around the planet.

David Knisely, Prairie Astronomy Club, Inc.



From [e-mail] Fri Mar 01 21:06:44 1996
From: [e-mail] (Barry Cheung)
Newsgroups: rec.radio.amateur.homebrew
Subject: Homebrew GPS receiver?
Date: 28 Feb 1996 06:26:53 GMT
Message-ID: <4h0sjd$[e-mail]>

Would like to have information on making a GPS receiver by my own.

Thanks for helping anyway.




From [e-mail] Fri Mar 01 21:06:45 1996
From: [e-mail] (Paul Erickson)
Newsgroups: rec.radio.amateur.homebrew
Subject: vfo230 - ts830s cable?
Date: 28 Feb 1996 07:08:33 GMT
Message-ID: <4h0v1h$[e-mail]>

I'm having trouble tracking down a cable for the vfo230 - ts830s combo.
Has anyone had any experience building one?

cheers, Paul
ve7cqk
email: [e-mail]



From [e-mail] Fri Mar 01 21:06:47 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Mike Morris)
Subject: Re: Homebrew earphone - Mike
Message-ID: <[e-mail]>
References: <4grm8r$[e-mail]> <4gsejk$[e-mail]>
Date: Wed, 28 Feb 1996 07:53:01 GMT

[e-mail](Tim Hynde ka8ddz/qrp Rochester, MI) writes:

>In <4grm8r$[e-mail]> [e-mail] (MVenable) writes:
>>
>>I want to use my 2-meter HT while motorcycle mobile.  I also wear a full
>>face helmet.  The helmet speaker/microphone conversions are pretty pricey.
>>I've seen ads for earphones that work as mikes (also expensive). Seems
>>like a good do-it-yourself project.   Does anyone know how to homebrew an
>>earphone-mike that will work under the helmet?
>>
>>Thanks and 73
>>
>>Mark Venable N1RSK
>>

>Hi Mark:

>I used to ride and had a Bell full face, I used a simple electret mike
>element glued into the chin portion of the helment, the speaker used
>was a simple 2" flat style I picked up at a hamfest. I did have to dig
>out a little of the cushion inside the helmet.

>The most unique portion however was a differential circuit made which
>took the input from another mike element mounted on the side of the
>helmet just under the lip. With motor noise comming into both elements
>the differential circuit only passed my voice to the rig (Well not 100%
>obviously) but WOW what a difference! Without it there was too much
>engine noise to have a decent QSO.

>The rest was just simple switching, I ran the PTT to a snap action
>micro-switch near the horn. Hope this gives you some ideas. Good Luck

Years ago I ran a Honda twin with a 2m and 220mhz mobile. I took the
starter button wires, ran them to a 3P3T switch, and ran one
side to the starter, the other side to the radio. The switch was
mounted by the right mirror on a small bracket that I made out of
cheap angle iron. For a microphone I mounted a electret cartridge in the
chin piece foam on a Bell clone helmet, and for received audio I
had an earphone. Make sure your radio unhooks the built in mic cartridge
when the external in plugged in - some don't.
For the antenna I glued a length of enameled wire to the edge of the
fairing windscreen. Later on I put a Larsen motorcycle antenna
(1/2 wave - no ground plane) on a saddlebag top. 2m on the left, 220mhz
on the right.

Sample schematic:
                                  0-------radio 220mhz PTT circuit
     +----------------------0---->0----original bike starter wiring
   starter                    !   0-------radio 2m PTT circuit
   button                     !
     !                        !
     !                        !   0-------radio 220m PTT circuit
     +----------------------0---->0----original bike starter wiring
                              !   0-------radio 2m PTT circuit
                              !
                              !   0------- 220mhz radio
          fused 12v   ------0---->0---- green light (i.e. engine start)
                                  0------- 2m radio
--
---
Mike Morris                                [e-mail]
#include <disclaimer.std.h>        I have others, but this works the best.
   This message assembled from 100% recycled electrons (and pixels).


From [e-mail] Fri Mar 01 21:06:48 1996
From: [e-mail] (progen et2)
Newsgroups: rec.radio.amateur.homebrew
Subject: WARP  WAS-1 AUTO-SWR SCHEMATICS
Date: 28 Feb 96 12:47:56 GMT
Message-ID: <[e-mail]>


I HAVE A WARP WAS-1 AUTO-SWR METER (THE ONE WITH REMOTE SENSORS)
SOME OF THE WIRES INSIDE IT HAVE BEEN CUT AND I HAVE NO REMOTE
SENSORS (YOU HAVE TO HAVE REMOTE SENSORS BECAUSE IT HAS NO OTHER SOCKETS)
I WAS WONDERING IF ANYBODY COULD GET SCHEMATICS FOR IT!
I WOULD REALLY LIKE TO FIX IT...I AM WILLING TO COVER ANY COPYING AND
POSTAGE OR ANY OTHER COSTS.
SORRY FOR ADDING EXTRA MAIL TO THE LIST! THANKS IN ADVANCE

WARREN EI6ETB

[e-mail]

ps. I might be able to build the remote sensors? after I fix the other bits..


From [e-mail] Fri Mar 01 21:06:49 1996
From: [e-mail] (ML, Michigan, USA)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED: ICOM T21A & IC-2000H mods
Date: Wed, 28 Feb 96 13:11:35 GMT
Message-ID: <4h1kbs$[e-mail]>

Please email mods to [e-mail].  Thanks!

73, KB8VBA


From [e-mail] Fri Mar 01 21:06:50 1996
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Marconi Signal Generator
Date: Wed, 28 Feb 1996 13:24:46
Message-ID: <[e-mail]>
Keywords: signal generator

Looking for operator's/service manual- or at least circuit schematic, for
Marconi Signal Generator, 10 kHz - 72 MHz, model TF144H/(4S) (military
CT452A).

Any assistance would be greatly appreciated. All costs refunded.

73, Drew Diamond, VK3XU.


From [e-mail] Fri Mar 01 21:06:50 1996
From: "Tom V. Pfaffenbach" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FRANKFURT VLF TIME STANDARD
Date: 28 Feb 1996 13:42:19 GMT
Distribution: usa
Message-ID: <4h1m3r$[e-mail]>

In regard to a posting by Alain Chabas - The best VLF receivers that I
have come across are the surplus Selective Voltmeters sold by Fair Radio
out of Lima,Ohio, USA. I have a Hewlett-Packard 312B that I use on the HF
bands 1.5-18 Mhz, and which I have occasionally tuned across the 10Khz to
500Khz range. There are a number of stations sending 3 letter morse
identifiers in that region. I have not heard any time broadcasts - at
least not in anything like the NIST-WWV format.

73 - K9JDU



From [e-mail] Fri Mar 01 21:06:51 1996
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MOSFET X-Ref: help!
Date: Wed, 28 Feb 1996 15:08:55 -0800
Message-ID: <[e-mail]>
References: <4ggmnn$[e-mail]> <4gj93f$[e-mail]>

Both Samsung and IRC make this same unit.  It is very commonly used
Cliff Buttschardt  W6HDO

On 23 Feb 1996, Thomas C. J. Sefranek wrote:

> Try MTP30N06
>
> Motorola
>
> See the Motorola Power FETs web site for specifications
>
> Tom
>
>
>
>


From [e-mail] Fri Mar 01 21:06:52 1996
From: Bert Burland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 40/80m  QRP CW kit?
Date: Wed, 28 Feb 1996 15:57:37 -0800
Message-ID: <[e-mail]>

Looking for leads to a QRP CW kit or construction plans for the same.
Prefer tubes and easy to follow instructions for a rank neophyte. :)
Any suggestions for reading materials?  /Bert - N5TOA


From [e-mail] Fri Mar 01 21:06:53 1996
From: [e-mail] (Ps7ab)
Newsgroups: rec.radio.amateur.homebrew
Subject: Unsubscribe
Date: 28 Feb 96 22:35:04 GMT
Message-ID: <[e-mail]>


unsubscribe

 * Sent via SFE-mail from [UNREGISTERED BBS]


From [e-mail] Fri Mar 01 21:06:54 1996
From: [e-mail] (Todd Owen)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: IC-245 and HTX-100 LSB mods needed
Date: Thu, 29 Feb 1996 00:38:02 GMT
Message-ID: <4h2sf2$[e-mail]>

I am looking the add LSB reception to my ICOM IC-245 2m and RS HTX-100
10m rigs for satellite downlinks.


--73, Todd KE4UDN

-----------------------------------------------------------------
Todd Owen       Hanover Engineers, P.C.
Richmond, VA    804-730-0011

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



From [e-mail] Fri Mar 01 21:06:55 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Subject: Re: 567 Tone Decoder Help Needed
Message-ID: <[e-mail]>
Date: Thu, 29 Feb 1996 15:09:01 GMT

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

(Jason Goldring) writes:

>I have been trying to set up a 567 tone decoder to install inside an old
Motorola radio, and
>I wish to set it's center frequency to 151.4 Hz (A CTCSS tone). After
reviewing several articles
>on how to implement the 567, I still cannot get it to decode the input tone.
>
>I realize that the formula is roughly Fo=1.1/(R x C) for determining the
center frequency,
>so from this formula, I have determined that a 0.47uf capacitor and a 25k
variable resistor
>for R and C would be sufficient, as I could tune the 567 to lock onto the
exact frequency, but
>this is where my problem starts. I have the earphone jack from my scanner
plugged into
>the 567 circuit, and decoupled with a .01uf capacitor. The output of the 567
is simply a
>red LED, for testing purposes. When I transmit from my portable, the scanner
receives
>it, but the LED does not light up, regardless on where the variable resistor
is set at.
>If the VR is set right to one end, though, the LED lights when I transmit, bu
t
it is not
>from the tone-in fact, I can turn the scanner off and transmit, and the LED
will light.
>Pretty weird. The schematic I used was based on the RAMSEY TD-1 tone decoder
>kit. I have checked and double checked my wiring, as well as making another
one,
>and it does the same. Any suggestions?
>
>Thanks in advance!
>Jason.
>
>

Can't comment on the operation of the circuit but CTCSS tones are usually
sub-audible.  Does you receiver have a high-pass filter in the audio output
which prevents the CTCSS tone appearing at the earphone jack.  ??



Dr. Gerry Butler,  CEng. MIEE. [[e-mail]]
TELTEC-TCD (Radio Propagation Planning), Trinity College,Dublin 2,Ireland
Dept. of Electronic and Electrical Engineering,
[ Dublin+Wicklow Mountain Rescue / EI0CH / EMT-D ]


From [e-mail] Fri Mar 01 21:06:56 1996
From: [e-mail] (Grzegorz Brzozowski)
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematy
Date: 29 Feb 96 16:42:08 GMT
Message-ID: <[e-mail]>

Czy moglbys mi wyslac jakies informacje o schematach, ktore posiadasz(o
sprzecie domowej konstrukcji).
                                [e-mail]


From [e-mail] Fri Mar 01 21:06:57 1996
From: mikemr (Michael Mraz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radiokit
Date: 29 Feb 1996 17:48:31 GMT
Message-ID: <4h4otf$[e-mail]>

Has anyone tried to call them lately? Their line has been
continually busy for the past 2 days. I'm trying to find out
the status of their 9-band SB-220 mod kit, if anyone knows. tnx

73  Mike  N6MZ  [e-mail]
--
The opinions expressed in this message are my own personal views
and do not reflect the official views of Microsoft Corporation.



From [e-mail] Fri Mar 01 21:06:58 1996
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: advice needed on homebrew ATU
Date: Thu, 29 Feb 1996 19:28:25 LOCAL
Message-ID: <[e-mail]>
References: <4h4kam$[e-mail]>

In article <4h4kam$[e-mail]> Paris Michael Andreou <[e-mail]
.ac.uk> writes:
>From: Paris Michael Andreou <[e-mail]>
>Subject: advice needed on homebrew ATU
>Date: 29 Feb 1996 16:30:14 GMT

>Dear all,

>hello. To all the hi-power experts out there:

>I want to construct an ATU, handling up to 1KW. I started searching for
> capacitors, but I am not sure what to look for. How does the voltage
>rating and/or spacing of air-caps relate to power handling?
>I was recently reading an  article on atu construction tips, and the author
>suggested that for severe mismatches at high power , the RF across a cap in a
>T-match could be up to 5000V. (the article was from a US amateur, so I take
>hi-power to be 1.5KW).So, if I understand well, the degree of mismatch you wa
nt
>your ATU to handle is also a critical factor in the voltage tolerance.

Yes the mismatch makes a significant difference and it is not just the SWR
that matters, but what the impedance is that causes the SWR. A tuner might
handle a much higher mismatch in one area of the Smith chart than another.

> Any advice from the gurus on how to pick the capacitors? Is there data in th
e
> literature I can look it up?

If you can find or afford them, vacuum capacitors are the way to go. The
voltage ratings are high, there are no sliding contacts and the minimum
capacitances are low.

> Another thing: can capacitors with the same spacing have different voltage
> rating? I have seen adverts of 2mm spacing capacitors with ratings of 4KV an
d
> 7.8KV. It doesn't look reasonable.

It's possible. It can depend on the thickness of the plates and their finish.
Thicker plates with radiused and polished surfaces will withstand higher
voltage before breakdown than will thin stamped plates with rough, sharp
surfaces and edges. The insulation supporting the fixed plates is a factor
too.

You must not forget the inductor either. Most of the loss in a well-designed
tuner will occur here.

Regards, Wes -- N7WS


From [e-mail] Fri Mar 01 21:06:59 1996
From: "Charles R. Patton" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Iron -on Transfers and  two layer register techniques
Date: 29 Feb 1996 21:32:39 GMT
Message-ID: <4h561n$[e-mail]>
References: <4gnhnb$[e-mail]>  <4goh27$[e-mail]> <[e-mail]>

There is still the chance of mis-registering when taping the sheets to the 'PC
B
spacer.  The method I used to use was to purchase a pair of "register pins" (t
hese are
1/4" stainless steel posts attached vertically to thin, flat stainless steel
sheets about 1" square and are available from commercial graphic art supply ho
uses.
They are used to register separation negatives during the graphics arts reprod
uction
process.)  Take your sheets and register them in contact.  Temporarily tape th
em
together.  Now using a standard 1/4" hole punch, either single hand operated o
r
3-hole, simultaneously punch at least two holes in a common edge of the films.
  Now
remove the tape and make up a 'PCB spacer' with enlarged holes at the position
 of the
film holes.  Now stack up as follows:  Tape 1st film layer to PCB with punch h
oles
beyond edge.  Turn over, insert register pins, and drop on 'PCB spacer' and 2n
d film
layer.  Tape 2nd layer to PCB.
  The register pins are perpendicular to the surface, so eliminate potential p
arallax
errors in conjunction with the 'PCB spacer'.  With this technique you can easi
ly
achieve a few mills of registration.
  Also as a side note, the register pins come in two flavors: totally round po
sts and
and ones that are flattened.  For really high accuracy one round, and one or t
wo
flattened units are used together.  This allows the different pieces of film t
o expand
or shrink slightly without causing  buckling which would lead to poor contacts
.
Unfortunately to use the flattened units requires an expensive punch.  However
 the
effect can be duplicated by using two round register pins, and elongating one
of the
holes in the film parallel to the edge.  (Think about it for awhile -- its a k
inematic
problem.)
  Hope this made sense.
Charles R. Patton
[e-mail]



From [e-mail] Fri Mar 01 21:07:00 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
From: [e-mail] (SARUMAN)
Subject: CB conversion for HAM use?
Message-ID: <[e-mail]>
Date: Thu, 29 Feb 1996 21:38:12 GMT

Howdy folks, I was just going thru some of my stuff and found my old Walkie T'
s
Both are 3 channel 3 watt units. one Lafayette one Radio Shack. Is it possable
to get Crystals for Frequencies other thatn the 40 CB Channels for use with
these units? Any other Mod's needed? Thanx for the help folks.
The Crystals in these are socketed if that matters. I've been out of this for
Years.


<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] Fri Mar 01 21:07:01 1996
From: Michael Petzold <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: What does GaAs-FET cost?
Date: 29 Feb 1996 22:14:07 GMT
Message-ID: <4h58ff$[e-mail]>

I've got a circuit diagram of a LNC, and its input stage is fitted with a
Mitsubishi MGF1502, a single-gate GaAs-FET. I couldn't find any GaAs
components in my catalogs (RS, Farnell), so my question is: What
(approx.) does such a device (or a similar one) cost? The text said it
was a cost-effective device, but I got no clue what the usual prices are.
(The same circuit uses a CF300 dual-gate GaAs tetrode. How much does this
cost?)

Thanks!

Michael



From [e-mail] Thu Mar 07 10:02:05 1996
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF LO Parasitic--common?
Date: Sun, 25 Feb 1996 19:38:02 -0500
Message-ID: <[e-mail]>

I recently noticed a low level parasitic
on a VHF crystal oscillator based on the
no-tune designs.  Seems that if the
transistors have enough gain at audio
frequencies, the parallel inductor that tunes
out the crystal's shunt capacitance can form
an audio feedback path.

The cure is simple--add a small value capacitor
in series to block the audio signal, yet pass the
desired VHF signal.

The spur is easier to see if the oscillator is
multiplied by a large number--with a 24 times
multiplier the +/- 930 Hz spurs were about 60 dB
down.

I wonder if other people have noticed similar
problems?  Maybe with similar circuits in more
critical applications where the spurs might be
a real problem?

Zack KH6CP/1  [e-mail]


From [e-mail] Thu Mar 07 10:02:06 1996
From: [e-mail] (PDRUNEN)
Newsgroups: rec.radio.amateur.homebrew
Subject: DTMF FTP SITE
Date: 25 Feb 1996 23:33:42 -0500
Message-ID: <4grd76$[e-mail]>
Reply-To: [e-mail] (PDRUNEN)

Special thanks to everyone that asked for a copy of my DTMF program.  I
have made the DTMF program available at my ftp  site.  You can still
request it by e-mailing me at [e-mail].

To get there ftp to users.aol.com

login as "ftp"
Password as "your e-mail address"
then cd /pdrunen
then cd /dtmf
get dtmf_v11.exe.

You will also find a really nice windows based GIF viewer, VUGRAF13.ZIP
for the taking.


From [e-mail] Thu Mar 07 10:02:08 1996
From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with Heath VTVM!!!!
Date: 26 Feb 1996 06:01:19 GMT
Distribution: usa
Message-ID: <thomas.g.booth-250296215018@160.205.101.24>
References: <4gj9k5$[e-mail]>

In article <4gj9k5$[e-mail]>, [e-mail]
(Jeffrey L. Bauman) wrote:
>
> I'm having the dumb problem of not being able to swing the
> needle all the way over to the 1.5V marker by adjusting the DC
> calibrate pot.  All wiring is correct, and the 12AU7 is just
> fine.

Jeff, when you say the 12UA7 is "just fine", does this mean you checked it
with a tube tester?  If you did use a tube tester, was it a dynamic
transconductance type (Military TV-7, Hickok 538, etc.) or the old
GOOD-?-BAD style emission tester so popular in Radio Shack stores 20 years
ago?  If your 12AU7 has low transconductance in either triode section, you
may not have enough differential gain to get full scale deflection on the
meter.

> Double checked the wiring - it's correct, with no apperent
> cold solder joints.  Correct components in place.

> I wired this myself recently, and just cant "calibrate" the
> meter.

I don't think Heath has made any VTVM kit for some years now.  Assuming
your kit sat unbuilt on someone's shelf for a long time, there's a slight
chance that the fixed resistors used on the plate and cathode sides of the
12AU7 may have gone out of tolerance.  A quick check w/ a friend's ohmmeter
should be able to check this possibility out.

> Anyone know of any mods / errata on this VTVM?  it
> 's the wide one with the large meter.  The box pivots in a
> "U" shaped mounting bracket.

I'm personally not aware of any errata w/ your VTVM...I'd think it unlikely
though, as the circuitry in your meter has gotta be almost identical w/
what's in the IM-18 I built over 20 years ago.

FWIW there have been a few aftermarket mods for the Heath and other similar
topology VTVMs from other manufacturers, most notably the battery
eliminator circuits intended to replace the D cell w/ a regulated 1.5 volt
DC source.  Heath for a time in the '70s offered a solid state conversion
kit for their VTVMs as well; this kit consisted of two custom modules which
replaced the 6AL5 & 12AU7, along w/ a resistor mod to the diode bleeder
string.

> Probe is fine.  1.5V voltage source fine.  This is stupid, but
> just can't get it to calibrate!

Oh, one last thing - have you checked the various voltages in the VTVM
against the values printed on the schematic?

> Thanks,

> Jeff
> WB5KZW

Good luck -

TGB

\\ The opinions expressed herein are my own. //


From [e-mail] Thu Mar 07 10:02:09 1996
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 15pin video, want to use old monitor
Date: Mon, 26 Feb 96 09:19:28 PDT
Message-ID: <[e-mail]>
References: <4gnt6c$[e-mail]>



> just not up on the types of signals comming from the 15 pin video
out.
>
> Thanks for any and all input.
>
> 73, Tim
> ka8ddz
>
You didn't say which brand laptop you were using, but most manuals
include pin out information in the back of the manual.  In any case,
my Zeos has the following pinout and it should be standard since all
the monitors work interchangably.

pin1    Red signal
pin2    Green signal
pin3    Blue signal
pin4    MS2
pin5    Ground
pin6    R ground
pin7    G ground
pin8    B ground
pin9    reserved
pin10   ground
pin11   MS0
pin12   MS1
pin13   Horizontal sync
pin14   Vertical sync
pin15   not used

MS0 - MS2 are inputs to the computer provided by the display to
indicate what type of display is connected.  I don't know the codes
off hand.  But the signals, I think, are simply open or grounded.

Also as you can see there is no simple composite video, or combined
intensity signal.  Unless one of the MS codes makes the display go
into a monochrome mode, you will have to pick one of the colors as
your output (probably green).

Hope this is a start, but you'll hopefully get a few more clues
somewhere else.

73....KI7RH



From [e-mail] Thu Mar 07 10:02:11 1996
From: [e-mail] (Pete Morgan-Lucas)
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Re: Simulating old valves/tubes with FETs
Date: 26 Feb 1996 09:51:08 GMT
Distribution: world
Message-ID: <4grvqc$[e-mail]>
References: <4gias8$[e-mail]>

Mike Addlesee ([e-mail]) wrote:

: --
: I am looking for advice on FET based equivalent circuits to replace
: old valves/tubes. In particular I have a National HRO-M which uses
: several 6C6. What are the most important characteristics that need
: to be reproduced?
: -------------
: Mike Addlesee

There's something on this in mid-sixties versions of the RSGB  "Amateur Radio
techniques" books.

Some guy replaced the RF amp and oscillator/mixer of an Eddystone S640 with
2N3819-type devices.

Personally, i consider this sacrilege, like making plasticene arms and
sticking them to the  Venus de Milo and calling it an improvement...

//Pete Morgan-Lucas//   G6WBJ
NERC Computer Services


From [e-mail] Thu Mar 07 10:02:11 1996
From: [e-mail] (Greg Snellgrove)
Newsgroups: rec.radio.amateur.homebrew
Subject: Where to find RF Chokes?
Date: 26 Feb 1996 15:32:27 GMT
Message-ID: <4gsjqb$[e-mail]>

I am building a 50s/60s vintage tube-type cw transmitter and after a long
hard parts search, I finally have all the parts I need except for the rf
chokes. I have called everywhere I knoe to call and have not had any
luck. What I need is 1 1.0mH RFC such as a Miller 4652-E and 2 2.5 mH
RFCs such as the Miller 4666-E. I have found out that these are still
being made by Miller, but the best source I have found so far would have
to order me 25 of each at $3.90 a piece! There has to be someplace to buy
small quantities of these. Any source you know of would be greatly
appreciated.

73,
Greg, KN4NO




From [e-mail] Thu Mar 07 10:02:13 1996
From: "Tom V. Pfaffenbach" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tunnel diodes: are they any good? If so, any circuits out there?
Date: 26 Feb 1996 15:58:14 GMT
Distribution: usa
Message-ID: <4gslam$[e-mail]>
References: <4gb2jb$[e-mail]>

Tunnel Diodes demonstrate negative resistance as the forward voltage
increases. Although they can be designed for sizeable currents, the power
level is limited by the low (typically tenths of a volt) level at which
the quantum tunneling effect is demonstrated. Hewlett Packard used tunnel
diodes for UHF/SHF oscillators and low-level amplifiers in some
instruments 3 decades ago, but the Gunn diode and small geometry devices
fill most applications today.

The quantum tunneling effect, like magnetic polarization, is
probabilistically instantaneous and has no upper frequency limit. To
demonstrate the effect, connect the diode to parallel resonant circuit
having d.c. continuity and bias the device into the forward region. In
the negative resistance region, oscillations will begin, and sustain.







From [e-mail] Thu Mar 07 10:02:14 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Charles Hoffman)
Subject: Re: Ideas on a power antenna
Message-ID: <[e-mail]>
Date: Mon, 26 Feb 1996 18:37:53 GMT
Reply-To: choffman @pelican.davlin.net
References: <4gg0i6$[e-mail]>

Ok on your Lincoln.  You can slot tune the rear window with a small
tuning network mounted on one side behind the rear seat.  Less
ingnition noise in the rear.  Good luck.


[e-mail] (Fender) wrote:


>Here's my idea.  I have a Lincoln Continental that I'm absolutely in love
>with and I really would like to have my 2m radio in it but I'm not too eager
>to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea
>for a compromise.  How feasable would it be to build some sort of matchbox
>so that I could run realtively low power (50 watts or less) at good SWR
>through the power antenna used for the FM stereo.  I figure that if it works,
> I'd mount a second in the fender and it could retract out of the way when
>not in use.  I figure that it would have a good ground plane but how
>would I achieve a good match?  All advice appreciated!  If this idea doesn't
>work out, anybody have any others for a rather inconspicuous  antenna?
>
>                                       Thanks!
>                                         Jay
>                                       N2OTK






From [e-mail] Thu Mar 07 10:02:15 1996
From: [e-mail] (Chuck Hanavin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where to find RF Chokes?
Date: 26 Feb 1996 21:12:17 GMT
Message-ID: <4gt7nh$[e-mail]>
References: <4gsjqb$[e-mail]>

In article <4gsjqb$[e-mail]>, Greg Snellgrove <[e-mail]> wrote:
>I am building a 50s/60s vintage tube-type cw transmitter and after a long
>hard parts search, I finally have all the parts I need except for the rf
>chokes. I have called everywhere I knoe to call and have not had any
>luck. What I need is 1 1.0mH RFC such as a Miller 4652-E and 2 2.5 mH
>RFCs such as the Miller 4666-E. I have found out that these are still
>being made by Miller, but the best source I have found so far would have
>to order me 25 of each at $3.90 a piece! There has to be someplace to buy
>small quantities of these. Any source you know of would be greatly
>appreciated.
>
>73,
>Greg, KN4NO
>
>



Try Mouser Electronics (1-800-346-6873). They sell 2.5 mh chokes,
similar to the J.W. Miller 4600 series. They cost $2.53 @ quanities
of one, and have no minimum order.

Good luck with the rig, I am building a 2e26 rig for 80m, maybe
we'll cross wires.

73, Chuck (WB3FJJ)



From [e-mail] Thu Mar 07 10:02:16 1996
From: [e-mail] (Conway Yee)
Newsgroups: rec.radio.amateur.homebrew
Subject: kits for HF rigs (QRO or QRP)
Date: 26 Feb 1996 23:04:03 GMT
Distribution: world
Message-ID: <[e-mail]>

I would like to build an HF rig.  Sadly, Heath is no longer around.
Ideally, I would like to build a rig that is in the 100Watt class.  Am
I mistaken that no such kits are bing sold nowadays and that I would
have to build from scratch if I wanted to build such a kit?

In the QRP class, I would like to build both CW and SSB rigs.  What is
out there that is multi-band?  I have written for information about
the Sierra from NorCal and now Wilderness.  What other CW rigs should
I be looking at?  How about SSB rigs?

--
                                  |       73 de Conway Yee, N2JWQ  | DON'T
                                  | EMAIL     : [e-mail] | TREAD
                                  | TELEPHONE :                    |  ON
                                  | FAX       :                    |  ME!


From [e-mail] Thu Mar 07 10:02:17 1996
From: [e-mail] (Glenn Elmore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Necessary Bandwidth
Date: 27 Feb 1996 16:14:57 GMT
Message-ID: <4gvam1$[e-mail]>
References: <[e-mail]>

Nigel Davison ([e-mail]) wrote:
: Hi,

: Can somebody explain to me exactly what is meant by necessary
: bandwidth and how it is calculated,  or is it just another way of
: expressing the conventional 3dB bandwidth?.

: My understanding is that it is the necessary bandwidth required to
: enable satisfactory reception of a modulated signal.  If this is so
: then is there an equation to calculate it?.
:

Nigel

  I suppose the term might be construed to mean "how much spectrum a
particular modulated signal occupies" using a 3 dB-down or 26 dB-down
or some other measure but my normal understanding of it would relate to
how much spectrum is necessary for a given signalling rate (baud).

 The Nyquist bandwidth deals with how much spectrum is required for a
particular signalling rate but the *information* bandwidth depends upon
S/N as described by Shannon.

   See my ARRL conference paper:

   ftp://col.hp.com/hamradio/packet/n6gn/arrlcnc/cnc.html

and select the paper "Physical Layer Considerations in building an
Amateur Radio Network" if you would like more details.

Glenn n6gn



From [e-mail] Thu Mar 07 10:02:19 1996
From: [e-mail] (Mark A. Garrett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM-10 question
Date: 27 Feb 1996 16:39:16 GMT
Message-ID: <4gvc3k$[e-mail]>
References: <4gqrpl$[e-mail]>
Reply-To: [e-mail] (Mark A. Garrett)


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

>I have a FM-10 (rev. F) that drifts.  I read in the FM-10 FAQ that the
>frequency selecting capacitor can be swapped out with a more stable one
>(tantalum, silver mica, polystyren).  Also the diodes can be swapped out
>with a zener diode.
>
>What type of capacitor and zener diode do I need to get and where can I
>get it?
>
>[e-mail]
>
The capacitors you can get from Newark but you will have to deal with a
minimum order (I believe around $25). You should be able to pick up
the caps at a local electronic parts dealer if you have one in your area.
You might also be able to pick up the 3 volt zener there too.  I did have
one question, what type of container do you have your FM-10 in?  If you
have it in the plastic one that Ramsey supplies it helps but if it is in
a metal box and the antenna is brought out thru a connector and mounted
away from other metal objects (and humans-they tend to cause possible
detuning) that might help.  Other items to note would be if you are using
batteries or a regulated power supply.
I have a friend I built one of these for and he is using the Ramsey supplied
case, a regulated power supply and has mounted on a shelf.  He never turns
the unit off and has had no problems with keeping the unit stable.  In fact
I have not reset it for him in over a year now.
--
Mark Garrett   [e-mail]
               KA9SZX @ N9LNQ.#ECIL.IL.USA.NOAM


From [e-mail] Thu Mar 07 10:02:19 1996
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Gary Coffman)
Subject: Re: Necessary Bandwidth
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
References: <[e-mail]>
Date: Tue, 27 Feb 1996 17:04:13 GMT

In article <[e-mail]> [e-mail] (N
igel Davison) writes:
>
>Can somebody explain to me exactly what is meant by necessary
>bandwidth and how it is calculated,  or is it just another way of
>expressing the conventional 3dB bandwidth?.

My books say that it is the bandwidth where the signal energy
has fallen 22 db from peak, or alternately, the bandwidth that
contains 99% of the signal energy of the emission, whichever is
greater.

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 Mar 07 10:02:20 1996
From: [e-mail] (Thomas M. Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: DDS  VFO
Date: Tue, 27 Feb 1996 17:50:42 GMT
Message-ID: <[e-mail]>

Greetings to everyone that reads this:

        I am wondering if anyone can recommend a single unit quantity
source for the Harris Semiconductor HSPA5102  DDS and CA3338 DAC chips
that are utilized in the DIGIVFO and DIGIBRAIN QST articles. Digikey
does not carry the DDS but does have the DAC.

        I would like to build my own variation of the DDS thus do not
wish to buy one of the kits as offered in the articles.

73 de VE7TMA


E-mail: [e-mail]
packet: VE7TMA@VE7KGW.#NVI.BC.CAN.NA


From [e-mail] Thu Mar 07 10:02:21 1996
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need 1n78 point contact mixer diodes
Date: 28 Feb 1996 12:13:06 -0500
Message-ID: <4h22f2$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)


For my old HP-8551 spectrum analyzer. If you have any I could sure use
them.

Thanks beforehand

-Viny Coppola


From [e-mail] Thu Mar 07 10:02:22 1996
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need attenuator for HP8551
Date: 28 Feb 1996 12:22:27 -0500
Message-ID: <4h230j$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)


The attenuator is for my deceased one in my HP 8551 spectrum analyzer. It
is
an
"N" coaxial type and it covers from 10 mhz to 10ghz. I guess any
substitute
could be pressed into service. Because of its age I will take what I can
get.


Thanks beforehand

-Viny Coppola


From [e-mail] Thu Mar 07 10:02:24 1996
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need microwave attenuator
Date: 28 Feb 1996 12:45:21 -0500
Message-ID: <4h24bh$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)



The attenuator is for my deceased one in my HP 8551 spectrum analyzer. It
is an
"N" coaxial type and it covers from 10 mhz to 10ghz. I guess any
substitute could be pressed into service.

Thanks beforehand

-Viny Coppola


From [e-mail] Thu Mar 07 10:02:25 1996
From: [e-mail] (Dave Dabell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TM231: where is memory battery?
Date: 28 Feb 1996 15:16:57 GMT
Message-ID: <4h1rl9$[e-mail]>
References: <4h08bu$[e-mail]>

Just did this last weekend.  Yes, the battery is mounted on the
back of the front panel pc board, wedged between the board and
the chassis.  Snap off the front panel plastic, remove knobs,
remove nuts from the mike connector and freq knob.  Then remove
clear plastic piece and then the sheet metal shield.  After all
this you can remove board, battery is on the back.  Sheet metal
has screws at the side that hold it on.  The clear plastic snaps
on kinda like the front panel.  Thanks, kenwood for making it
SO easy..
Instead of ordering a replacement from kenwood's parts subcontractor,
I got one from digi-key.  I hear you can also order one from radio
shack

  73,  dave  wa3u

Stan Korzep ([e-mail]) wrote:
: Does anyone know where inside the Kenwood TM231A 2 meter transciever
: the battery used for memory power is located?
: Appreciate any help and any suggestions on how to remove front PC board
: if battery is located on that board.
: Stan
: [e-mail]


From [e-mail] Thu Mar 07 10:02:26 1996
From: [e-mail] (ian simcock)
Subject: Help: Radio Design
Newsgroups: rec.radio.amateur.homebrew
Summary:
Keywords:
Message-ID: <[e-mail]>
Date: 28 Feb 96 15:25:01 GMT

I posted this before, but I didn't get any respose, so I'm trying again.

I'm hopeing that someone could point me to either
1) An Internet site with circuit diagrams
2) A book with appropriate circuits
3) A person who could design an appropriate circuit
4) A company that sells what I want.

What I need is a small radio that fits the following specs -
1) Any frequency (preferably an unlicenced piece of spectrum)
2) Digital transmition of 500 bytes per second
3) 200 meter range under bad indoor conditions
4) Digital tuning
5) Runs on 4-6 volts
6) Low power consumption
7) Rapid startup/shut down for the transmiter
8) 10 channels


If possible I'd like the following improvements
1) 1000+ bytes per second
2) 500+ meter range
3) Run on 3-6 Volts
4) 30+ channels
5) Able to easily transmit analogue (voice) signals
6) Full duplex opperation (Able to transmit and recieve at the same time)

Thanks for reading this far.
I'd appriciate any help anyone can give me,
   Ian Simcock.


From [e-mail] Thu Mar 07 10:02:27 1996
From: [e-mail] (Ken Edwards)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Whatever happened to AC-SSB ??
Date: 28 Feb 1996 15:51:55 GMT
Distribution: world
Message-ID: <4h1tmr$[e-mail]>


A few years ago ther was alot of talk about Amplitude Compandored Single-Side
Band communications.

Haven't heard much about it lately.

Any pointers on info ?

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

Ken M. Edwards, PE                  Nortel, Research Triangle Park, NC
[phone]      email: [e-mail]

All opinions are my own and do not necessarily reflect the views of
my employer or co-workers, family, friends, congress, or president.


From [e-mail] Thu Mar 07 10:02:28 1996
From: [e-mail] (James Blaney)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help needed
Date: Wed, 28 Feb 1996 16:38:53 LOCAL
Message-ID: <[e-mail]>

Hi folks,
IÆam new here so forgive me if I sound stupid.
Does anyone have details on how to build a ô very basic ô Short-wave Reviver
( Crystal set type of thing ). Any details on WWW sites, KitÆs, any informatio
n
at all would be appreciated.

-----------------------------------------------------------------
James Blaney               Why is the universe here ?
Harris Ireland.             Why ?, where else would it be !
-----------------------------------------------------------------
   Fax : Intl. + 353 42 32532  Call : Intl. + 353 42 35401
                   E-Mail : [e-mail]
                      These are my opinions,
         and not those of Harris Semiconductor.
-----------------------------------------------------------------


From [e-mail] Thu Mar 07 10:02:29 1996
From: [e-mail] (Ps7ab)
Newsgroups: rec.radio.amateur.homebrew
Subject: Unsubscribe
Date: 28 Feb 96 22:35:00 GMT
Message-ID: <[e-mail]>


unsubscribe

 * Sent via SFE-mail from [UNREGISTERED BBS]


From [e-mail] Thu Mar 07 10:02:30 1996
From: [e-mail] (EricNess)
Newsgroups: rec.radio.amateur.homebrew
Subject: 567 Tone Decoder Help Needed
Date: 29 Feb 1996 01:36:44 -0500
Message-ID: <4h3hhs$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (EricNess)

From your description, it is clear that RF is getting into your circuit.
This explains why the LED lights even when the power is turned off.  The
best way to keep the RF out would be to mount the circuit inside the
scanner.  Keep all the leads short and be sure to bypass the power line
(.001 uF should work fine.)  On the other hand, I can see two other
possible pitfalls so it would be best to get the circuit working first
before building it in.  If you transmit into a dummy load, there should be
enough signal for your scanner but not enough to mess up the 567.

Now for other pitfalls...It is quite possible that frequencies below 200Hz
are filtered out and therefore will never make it to the earphone jack.
If such is the case, you will need to get the audio right after the
discriminator.  The discriminator level audio may need additional
amplification to work with the 567.

Pitfall number 2 involves the input signal.  567s don't lock very well if
there is noise on the signal (like voice).  The best way to fix this is to
filter out the noise.  A simple lowpass filter with a cutoff freq of 200
Hz should do.  An 8 pin dual opamp will do the trick nicely, one amp for
the low pass filter and the second amp to raise the voltage level.


From [e-mail] Thu Mar 07 10:02:32 1996
From: [e-mail] (Mike Cook - AF9Y)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,aus.radio.amateur.misc,uk.radio.amateur
Subject: The Weak Signal Challenge - 1 Year, No Winner
Date: 29 Feb 1996 03:18:01 GMT
Message-ID: <4h35t9$[e-mail]>

The Weak Signal Challenge - 1 Year, No Winner


For the last year, I have sponsored a weak signal contest from my web
page (http://www.webcom.com/~af9y/).   Hundreds have attempted to
extract the call of this weak Morse code signal using various signal
processing techniques.  So far, all have failed.  I know it is
possible to extract the call letters using a combination of signal
processing and the "ears" of a well trained operator.

I am now increasing the prize to $100 for the first correct
identification of the calling station.  I believe the winner will have
to break new ground in signal processing techniques.  I've made
available a text list of all possible calls to neutralize any
recognition advantage that an experienced operator would have.

The challenge is a one minute digitized recording of a weak moonbounce
signal.  The Morse code signal is just above the noise but is strong
enough to allow copy of my call letters (AF9Y) near the middle of the
one minute period.  The mystery station is sending a simple repeat of
his call and my call.  The characters "DE" may or may not be between
the two calls.

The file is called unkn422.wav and is available from:

     http://www.webcom.com/~af9y

Additional information is available in the web page.


de Mike, AF9Y


http://www.webcom.com/af9y
Work: [e-mail]
Home: [e-mail]





From [e-mail] Thu Mar 07 10:02:33 1996
From: [e-mail] (CHARLES J. MICHAELS)
Newsgroups: rec.radio.amateur.homebrew
Subject: Source of MMICs
Date: 29 Feb 1996 03:59:24 GMT
Message-ID: <4h38as$[e-mail]>


        Can anyone suggest source in small quantities of
Avantec MSA cascadable MMICs or equivalent devices?  Specifically
the Avantec MSA 0685 or equivalent.
        I used these in the *Null Steerer* of my QST article in
July 1994 p 29 but have no response now from the sourvce mentioned
in my article.

Charlie, W7XC
--


From [e-mail] Thu Mar 07 10:02:35 1996
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <[e-mail]>
Date: Thu, 29 Feb 1996 12:19:00 -0500
Subject: kits for HF rigs (QRO or
Message-ID: <[e-mail]>

From: [e-mail]
"mail sometimes bounces here, please resend if needed!"

Hi COnway... if you want to build kits try looking up all of the
suppliers in MEGALIST.TXT (see below)

CY>I would like to build an HF rig.  Sadly, Heath is no longer around.
CY>Ideally, I would like to build a rig that is in the 100Watt class.  Am
CY>I mistaken that no such kits are bing sold nowadays and that I would
CY>have to build from scratch if I wanted to build such a kit?

CY>In the QRP class, I would like to build both CW and SSB rigs.  What is
CY>out there that is multi-band?  I have written for information about
CY>the Sierra from NorCal and now Wilderness.  What other CW rigs should
CY>I be looking at?  How about SSB rigs?

CY>                                  |       73 de Conway Yee, N2JWQ  | DON'T

Updated copies downloadable from BBSes at:
[phone], [phone], [phone], [phone]
[phone], [phone], [phone], [phone]

FTP site is at ftp.Lehigh.EDU.  Login as anonymous, and use your
e-mail address as the password.
FTP:  ftp://ftp.lehigh.edu/pub/listserv/qrp-l/misc/megalist.txt
WWW: http://qrp.cc.nd.edu/QRP-L/index.html
WWW: http://www.nd.edu/~shideg/

DOWNLOAD as MEGALIST.ZIP or individually as:
megalist.txt
manuals.txt
dealers.txt
tubes.txt
xtals.txt
========

 * SLMR 2.1a * I gave my argument to the judge, Tom said briefly.



From [e-mail] Thu Mar 07 10:02:36 1996
From: [e-mail] (Douglas R Davis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Linear Amp Modifications?
Date: 29 Feb 96 14:14:55 GMT
Message-ID: <[e-mail]>

How much trouble would it be to modify an amp made for use between 3-30 MHz,
for use on, say...75 meters? Is it possible or economically feasible?

Thanks.


From [e-mail] Thu Mar 07 10:02:37 1996
From: [e-mail] (Bob Applegate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Can anyone ID these IF amps?
Date: 29 Feb 96 20:38:08 GMT
Message-ID: <[e-mail]>

Last night I picked up some IF amps at our club's White Elephant sale.  They
have RCA part numbers, but none of the retired RCA guys at the meeting had
any idea what they were for.  Markings are:

   LOG IF AMPLIFIER
   RHG ELECTRONICS LAB (15286)
   MODEL NO. ICL60G23EA
   RCA CORP P/N 5616449-5

The connectors are labeled: IF IN, -15V, RET, +15V, TP1, VID 1, VID 2, TP2.

The price was right (25 cents each), so it was worth the gamble that they
might be something interesting.

Any info about specifications would be appreciated!

Tnx
Bob - WA2ZZX

Bob Applegate, [e-mail]
Water Wheel Systems
35A East Main Street, Suite 10
Marlton, NJ  08053
609-596-0032




From [e-mail] Thu Mar 07 10:02:38 1996
From: gary <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Linear Amp Modifications?
Date: 29 Feb 1996 22:52:03 GMT
Message-ID: <4h5amj$[e-mail]>
References: <[e-mail]>

Either this guy doesn't proofread his messages, or somehow has failed to
realize that 75 meters is *already* within the 3-30 mhz range...

--
Gary....    *** I AM THE NRA! ***




From [e-mail] Thu Mar 07 10:02:39 1996
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct conversion
Date: Thu, 29 Feb 1996 23:04:16 GMT
Message-ID: <4h2n4l$[e-mail]>
References: <[e-mail]>

[e-mail] (Clifton T. Sharp) wrote:

>I've decided to try to design a MW broadcast-band receiver (at least in
>part to bolster my meager analog design skills), and it occurred to me
>that I might like to try using direct conversion.

You sound like you're way ahead of me on this one in terms of
engineering skills, but as I understand it, DC receivers don't work
with AM signals such as you'd find on the MW broadcast band.  I've
managed to listen to AM SW on the several DC boxes I've built, but I
had to zero beat them very carefully.  It's unclear how to get rid of
the heterodyne in a DC design....

...but if there's a way, boy, I'd love to learn about it!

--73--

--Jeff Duntemann KG7JF
  Scottsdale Arizona



From [e-mail] Thu Mar 07 10:02:40 1996
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Where to find RF Chokes?
Date: Thu, 29 Feb 1996 23:21:10 GMT
Message-ID: <4h2o4d$[e-mail]>
References: <4gsjqb$[e-mail]>

[e-mail] (Greg Snellgrove) wrote:

>I am building a 50s/60s vintage tube-type cw transmitter and after a long
>hard parts search, I finally have all the parts I need except for the rf
>chokes.

If you're doing Glowbug work, you should have both the Fair Radio
Sales catalog (Lima, Ohio) and that of Antique Electronics Supply
(Tempe, Arizona.)  Both are long-time mail order firms with wonderful
reputations, and I've bought a lot of stuff from them.

Antique Electronic Supply is at [phone]; Fair Radio Sales is at
[phone].

DC Electronics here in Scottsdale has a good catalog with Miller
chokes, tho they're not heavy into tube stuff.  Call them and get
their catalog: [phone].

More and more people seem to be building with tubes.  It's a neat
trend.  I like radio parts that are big enough to see.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona