World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1995_10/_homebre.txt

Text File | 1997-02-01 | 562KB | 13,976 lines

The World of Ham Radio CD-ROM



From [e-mail] Wed Oct 04 13:49:15 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Clean audio PA op amp needed
Date: Mon, 2 Oct 1995 17:23:19 -0700
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 6
Message-ID: <[e-mail]>
References: <[e-mail]> <44prcd$[e-mail]>
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In-Reply-To: <44prcd$[e-mail]>

Do NOT try and run the LM 380 with less than 12 volt power supplies!
They do turn into noise generators even with many micofarad of supply
bypassing.  Use an LM 386 instead, even if a nine volt battery is used.
Some LM 380's are OK at lower voltages but why try and find the units
that will work at the lower voltage?  73 de Cliff  W6HDO



From [e-mail] Wed Oct 04 13:49:15 1995
Path: news.epix.net!news.sprintlink.net!news-relay.eworld.com!not-for-mail
From: [e-mail] (Allen.R)
Newsgroups: rec.radio.amateur.homebrew
Subject: Spectrum Display for Yaesu FT-1000
Date: 2 Oct 1995 20:12:35 -0700
Organization: eWorld
Lines: 6
Sender: [e-mail]
Message-ID: <44q9n3$[e-mail]>
Reply-To: [e-mail] (Allen.R)

I've been trying to buy/build a spectrum display unit for a Yaesu FT-1000
transceiver.  Grove used to carry one but now they only carry a 10.7 MHz
IF version and the FT-1000 has a 73.62 MHz IF.  Does anyone know of any
plans/articles on creating such a device?
AA6UZ
Dick Allen


From [e-mail] Wed Oct 04 13:49:17 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Clean audio PA op amp needed
Date: Mon, 02 Oct 95 22:33:55 GMT
Organization: Home
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <[e-mail]> [e-mail] "Pete Soper" writes:

> Hello,
>         Call me a sucker, but I tried to use an LM380 as the PA
> for an audio filter project. If I ever need a pink noise generator
> I've got just the thing in my junk box now :-)
>         Could somebody suggest a low noise (i.e. very low hiss)
> alternative that I can use with both headphones and speaker? Something
> I can get from DigiKey or Mouser would be ideal. I only need a half watt
> for speaker use, not the full power the LM380 is capable of. I'd like to
> use a 9 volt supply for this but could go up to 12 or down to 5 or 6.

I like the Philips TDA7052. It gives 1.2 W into 8R at 6V, and needs
virtually no external components. The gain is fixed at 40 dB, it needs
no heatsink, and produces no power on/off clicks. 8-pin DIL package, and
quite cheap!

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 Oct 04 13:49:18 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Clean audio PA op amp needed
Date: 3 Oct 1995 04:22:26 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 23
Message-ID: <44qdq2$[e-mail]>
References: <[e-mail]>
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X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

[e-mail] (Pete Soper) wrote:
>Hello,
>       Call me a sucker, but I tried to use an LM380 as the PA
>for an audio filter project. If I ever need a pink noise generator
>I've got just the thing in my junk box now :-)
>       Could somebody suggest a low noise (i.e. very low hiss)
>alternative that I can use with both headphones and speaker? Something
>I can get from DigiKey or Mouser would be ideal. I only need a half watt
>for speaker use, not the full power the LM380 is capable of. I'd like to
>use a 9 volt supply for this but could go up to 12 or down to 5 or 6.


Kevin's nice response probably answers a lot of questions (for me anyway). One
thing I noted many years ago in developing an audio system for a HB receiver
was that the distortion specs on these amps are for full output.  If you try
to use good quality (hi-fi) headphones, that require only a few millwatts of
drive, the crossover distortion will drive you nuts. In effect, the THD seems to
increase at lower signal amplitudes. I know it's not pure, but it's hard to beat
a nice LC filter for trash clean up. 'Course if you're into modern music, you
want all the distortion you can get <g>.

Regards, Wes



From [e-mail] Wed Oct 04 13:49:18 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!news.isp.net!newsadmin
From: Scott Frankel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: looking for info on theramins
Date: 3 Oct 1995 04:36:00 GMT
Lines: 14
Message-ID: <44qejg$[e-mail]>
NNTP-Posting-Host: eb236.slip.net
Mime-Version: 1.0
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No, not multi-vitamins -
Can't seem to find any references to these radio/musical instruments
anywhere.  Would anyone know where I can get more information on them
(I'm not even sure I'm spelling it correctly)?  Or better yet, would
anyone have any plans floating around for building a theramin?

Thanks in advance,
Scott
[e-mail]

p.s.  I've had very limited electronics experience so basic info would
be a big plus :)




From [e-mail] Wed Oct 04 13:49:20 1995
Path: news.epix.net!news.sprintlink.net!simtel!zombie.ncsc.mil!paladin.american.edu!news.jhu.edu!aplcenmp!night.primate.wisc.edu!newsspool.doit.wisc.edu!decwrl!news1.digital.com!nntp-hub2.barrnet.net!nntp-ucb.barrnet.net!well!cust30.max2.seattle.wa.ms.uu.net!tkreyche
From: Tom Kreyche <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for info on theramins
Date: 3 Oct 1995 06:08:51 GMT
Organization: well
Lines: 17
Distribution: world
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References: <44qejg$[e-mail]>
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In article <44qejg$[e-mail]> Scott Frankel, [e-mail]
writes:
>Subject: looking for info on theramins
>From: Scott Frankel, [e-mail]
>Date: 3 Oct 1995 04:36:00 GMT
>>No, not multi-vitamins -
>Can't seem to find any references to these radio/musical instruments
>anywhere.....

It's theremin. I built one from a kit about 25 years ago, I think it was
advertised or featured in Popular Electronics. If you can get an index
for PE you might find it. It was nearly impossible to keep tuned due to
temperature changes but it was a neat toy. I'm sure there are better
designs now. It's just an oscillator circuit with capacitive adjustment
(via the hand or body).

-tk


From [e-mail] Wed Oct 04 13:49:20 1995
Path: news.epix.net!news.sprintlink.net!EU.net!dkuug!Norway.EU.net!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!pc182-89
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Receiver Schematics
Date: 3 Oct 1995 07:46:18 GMT
Organization: Oslo College
Lines: 11
Message-ID: <44qpoa$[e-mail]>
NNTP-Posting-Host: pc182-89.iu.hioslo.no
X-Newsreader: News Xpress Version 1.0 Beta #4

Anybody know where to find schematics
for 2m - 160m receivers ?

Please post www/ftp adress or
mail me at e-mail adress:[e-mail]

Thanks.

-------------------------------------------------------------------------
 AARVIK GEIR/3EY, email : [e-mail]
-------------------------------------------------------------------------


From [e-mail] Wed Oct 04 13:49:21 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!kaiwan.kaiwan.com!ledge!bob.albert
From: [e-mail] (BOB ALBERT)
Newsgroups: rec.radio.amateur.homebrew
Subject: Heath catalogs FS
Message-ID: <[e-mail]>
Date: Tue, 03 Oct 95 10:04:00 -0800
Distribution: world
Organization: The Ledge PCBoard: Lake View Terrace, CA: USA: 818-896-2007
Reply-To: [e-mail] (BOB ALBERT)
X-Newsreader: PCBoard Version 15.22
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Lines: 2

I have a pile of old Heathkit catalogs that I want to sell.  Anyone
want them?  73 DE K6DDX


From [e-mail] Wed Oct 04 13:49:22 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!mn6.swip.net!plug.news.pipex.net!pipex!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!nntp.teleport.com!not-for-mail
From: [e-mail] (Wayne Allen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Anyone know of good 220 Ant.
Date: 3 Oct 1995 10:36:56 -0700
Organization: Teleport - Portland's Public Access [phone]
Lines: 13
Distribution: usa
Message-ID: <44rsbo$[e-mail]>
NNTP-Posting-Host: kelly.teleport.com

I own a couple 220 Mhz repeaters and I was wondering if anyone has found
a good homebrew antenna to use or if anyone knows where to get one cheap
that works really well.  Please e-mail me if you have any info.

Thanks,

Wayne Allen KB7OYI

[e-mail]

--
[e-mail]  Public Access User --- Not affiliated with Teleport
Public Access UNIX and Internet at [phone] (2400-14400, N81)


From [e-mail] Wed Oct 04 13:49:23 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Nan Gwa)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for info on theramins
Date: 3 Oct 1995 12:11:00 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 20
Sender: [e-mail]
Message-ID: <44rnak$[e-mail]>
References: <44qejg$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <44qejg$[e-mail]>, Scott Frankel <[e-mail]>
writes:

>
>No, not multi-vitamins -
>Can't seem to find any references to these radio/musical instruments
>anywhere.  Would anyone know where I can get more information on them
>(I'm not even sure I'm spelling it correctly)?  Or better yet, would
>anyone have any plans floating around for building a theramin?
>
>

I think they're named after a fellow named Leon Theremin, their inventor.
Joseph Schillinger, the musical theorist, (tried to marry music and math)
wrote some music for theremin.  They never caught on musically because
they're short on harmonics.  Just another curiosity like the heckelphon,
or the musette.  If you build one, don't practice when your neighbors
are home!

Tom Donaly


From [e-mail] Wed Oct 04 13:49:24 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!sunic!sunic.sunet.se!news.funet.fi!news.csc.fi!nokia.fi!ntc.nokia.com!trepc227!ilkka.kontola
From: [e-mail] (Ilkka Kontola)
Newsgroups: rec.radio.amateur.homebrew
Subject: 300 V Low Cost RF Power MOSFETs
Date: Tue, 3 Oct 1995 13:25:05
Organization: Nokia Mobile Phones
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: trepc227.nmp.nokia.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

RF Design Aug 1995 cover story "Low Cost 1000 Watt,
300 Volt RF Power Amplifier for 13.56" describes a
class C 1 kW amplifier using four MOSFETS.

The ARF444/ARF445 MOSFETs are manufactured by
Adcanced Power Technology. What is unusual with these
MOSFETs is the plastic TO-247 package. Also the 300 V
operating voltage simplifies the power supply a lot.

If these MOSFETs were as inexpensive as the article hints
and if one could get decent IMD in linear amplifier use
they would revolutionize HF amplifier homebrewing.

Personally being more declined to VHF/UHF weak
signal work (but somewhat active on HF) I would be
delighted if one could with 100 W drive (IC-736)
get, say, 500 Watts output on 50 MHz using these MOSFETs.

Does anyone have any experience or at least more data
on these MOSFETs?

73

Ilkka OH3NJC


*********************************************************************
Ilkka Kontola                   E-Mail: [e-mail]
Nokia Mobile Phones             Amateur packet radio: oh3njc@oh3rbr
Tampere, Finland


From [e-mail] Wed Oct 04 13:49:25 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!simtel!news.kei.com!travelers.mail.cornell.edu!cornellcs!rochester!galileo.cc.rochester.edu!ceas.rochester.edu!atd.rochester.ny.us!al
From: [e-mail] (Al Davis)
Subject: Re: Clean audio PA op amp needed
Message-ID: <[e-mail]>
X-Newsreader: TIN [version 1.2 PL2]
References: <[e-mail]>
Date: Tue, 3 Oct 1995 14:35:18 GMT
Lines: 16

In article <[e-mail]> you wrote:
:       Could somebody suggest a low noise (i.e. very low hiss)
: alternative that I can use with both headphones and speaker?  Something
: I can get from DigiKey or Mouser would be ideal. I only need a half watt
: for speaker use, not the full power the LM380 is capable of. I'd like
: use a 9 volt supply for this but could go up to 12 or down to 5 or 6.

How about a standard op-amp with a power stage added?  A single
complementary pair - emitter follower should do it.  Put it inside
the feedback loop.  With a pair bootstrap capacitors, you won't
lose voltage swing.  Use whatever op-amp meets the input and
gain-bandwidth requirements.


--



From [e-mail] Wed Oct 04 13:49:26 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!ftpbox!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: Re: Clean audio PA op amp needed
Reply-To: [e-mail]
Organization: Motorola Satellite Communications
Date: Tue, 3 Oct 1995 15:27:50 GMT
Message-ID: <[e-mail]>
References: <[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
Lines: 34

> Hello,
>       Call me a sucker, but I tried to use an LM380 as the PA
> for an audio filter project. If I ever need a pink noise generator
> I've got just the thing in my junk box now :-)
>       Could somebody suggest a low noise (i.e. very low hiss)
> alternative that I can use with both headphones and speaker? Something
> I can get from DigiKey or Mouser would be ideal. I only need a half watt
> for speaker use, not the full power the LM380 is capable of. I'd like to
> use a 9 volt supply for this but could go up to 12 or down to 5 or 6.
> -------------------------------------------------------------------------
> Pete Soper KS4XG  ([e-mail]) 919 481 3730/voice 919 481 3868/FAX
> Encore Computer Corp    901 Kildaire Farm Rd       Cary, NC 27511     USA

Yes, I have had the same experience.  I have since replaced
it with a LM383 (also known as a TDA2002, CA2002, or ULN3701Z).

It comes in a five pin TO220 package, cost about $2.50.

It is certainly not noiseless either, but is much better than that
lousy LM380.

I did experience some instability though, which I finally cured
by feeding the 12v via a 7808 voltage regulator (or was it a 78L09?).
The current limit feature of the regulator stopped the instability
(motorboating: self explanitory if you ever hear it).  Even at reduced
voltage, there was plenty of volume for bother speaker and headphone work.

Later, I noticed the same type of current limit circuit applied to a
LM380 in one of the ARRL QRP books.

- Dan Tayloe, WB0NVB





From [e-mail] Wed Oct 04 13:49:27 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Clean audio PA op amp needed
Date: Tue, 03 Oct 95 17:02:41 GMT
Lines: 12
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Dan Tayloe ) wrote:

>Yes, I have had the same experience.  I have since replaced
>it with a LM383 (also known as a TDA2002, CA2002, or ULN3701Z).

The TDA2002 is an excellent amplifier for this.  It's used in many
12V hi-fi audio applications.

73,

Jack  WB3U


From [e-mail] Wed Oct 04 13:49:28 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for info on theramins
Date: Tue, 03 Oct 95 17:12:46 GMT
Lines: 25
Message-ID: <[e-mail]>
References: <44qejg$[e-mail]> <44rnak$[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] (Nan Gwa) wrote:

>I think they're named after a fellow named Leon Theremin, their inventor.
>Joseph Schillinger, the musical theorist, (tried to marry music and math)
>wrote some music for theremin.  They never caught on musically because
>they're short on harmonics.  Just another curiosity like the heckelphon,
>or the musette.  If you build one, don't practice when your neighbors
>are home!

The lack of harmonics is easily rectified with a "fuzz" circuit employing
diodes.  The real disadvantage to these devices is the lack of multiple,
simultaneous notes (chords).  Nowadays, you can create the same effect as
a theremin with any good synthesizer, although the method of control is
different.

I remember a complete construction article for a theremin in Popular
Electronics, back in the mid-60's.  The device was pictured on the cover
and I think it used triangular plates for each surface.  One plate
controlled the volume, the other the pitch.  These devices work on the
same principle as metal detectors.

73,

Jack  WB3U


From [e-mail] Wed Oct 04 13:49:29 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Buster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Anyone know of good 220 Ant.
Date: 3 Oct 1995 19:22:50 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 16
Message-ID: <44s2ia$[e-mail]>
References: <44rsbo$[e-mail]>
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Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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To: [e-mail]

[e-mail] (Wayne Allen) wrote:
>I own a couple 220 Mhz repeaters and I was wondering if anyone has found
>a good homebrew antenna to use or if anyone knows where to get one cheap
>that works really well.  Please e-mail me if you have any info.


Try a J-Pole.   I had an old 2m twin-lead J-Pole that I cut down for
my 220 HT.  It works really good.  You could make a copper pipe J-pole
for about $8.  Down here in Arizona, a lot of people working FM on 2
meters just love the J-Pole.

  Good luck & thanks for putting up a buck and a quarter meter machine.


  Buster



From [e-mail] Wed Oct 04 13:49:30 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news.cac.psu.edu!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 300 V Low Cost RF Power MOSFETs
Date: 3 Oct 1995 19:30:24 GMT
Organization: Applied Research Laboratory, The Pennsylvania State Universitiy
Lines: 41
Message-ID: <44s30g$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sor.arl.psu.edu
X-Newsreader: IBM NewsReader/2 v1.2

In <[e-mail]>, [e-mail] (Ilkka Kontola) writes:
>RF Design Aug 1995 cover story "Low Cost 1000 Watt,
>300 Volt RF Power Amplifier for 13.56" describes a
>class C 1 kW amplifier using four MOSFETS.
>
>The ARF444/ARF445 MOSFETs are manufactured by
>Adcanced Power Technology. What is unusual with these
>MOSFETs is the plastic TO-247 package. Also the 300 V
>operating voltage simplifies the power supply a lot.
>
>If these MOSFETs were as inexpensive as the article hints
>and if one could get decent IMD in linear amplifier use
>they would revolutionize HF amplifier homebrewing.
>
>Personally being more declined to VHF/UHF weak
>signal work (but somewhat active on HF) I would be
>delighted if one could with 100 W drive (IC-736)
>get, say, 500 Watts output on 50 MHz using these MOSFETs.
>
>Does anyone have any experience or at least more data
>on these MOSFETs?
>
>73
>
>Ilkka OH3NJC
>
>
>*********************************************************************
>Ilkka Kontola                  E-Mail: [e-mail]
>Nokia Mobile Phones            Amateur packet radio: oh3njc@oh3rbr
>Tampere, Finland
I remember reading that article, and if my memory serves me correctly, due to
the high gate capacitance and other characteristics, you would be hard pressed
to use these devices much past the medium frequency range.  I think these
devices were developed for switching power supplies whose frequencies of
operation are in the hundreds of kiloHertz.  I doubt if you could get anywhere
close to VHF operation out of them.

regards,

Bob  AD3K


From [e-mail] Wed Oct 04 13:49:32 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.net99.net!ratty.wolfe.net!usenet
From: [e-mail] (Jim Barber)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to Interface aging Kaypros for CW keyers
Date: 3 Oct 1995 21:20:57 GMT
Organization: Crystal Linen/BDJ
Lines: 29
Message-ID: <44s9fp$[e-mail]>
References: <4496ad$[e-mail]>
NNTP-Posting-Host: yak-ts1-p05.wolfenet.com
X-Newsreader: WinVN 0.92.6+

In article <4496ad$[e-mail]>, [e-mail] () says:
>
>Can anyone tell me the correct data and status register ports for the
>Kaypro II and the Kaypro 4-84?  Also, can anyone confirm that the
>standard serial modem port is 04h-data/06h-status?
>

Bob:

Interesting application !
As it happens, I still have a mint Kaypro II in the closet.  I can
verify that you have the ports right; perhaps you aren't programming
the UART (I don't remember what chip they use) correctly.
If I remember correctly, you have to set the control register to
a specific bitmask to enable the handshaking lines.  It's been
8-10 years or so since I fooled much with 'em, but I'll take a look.
Do you know if they used the Z80 SIO ?  I still have the docs for
all the "native" Z80 peripherals on the "retired" shelf.

As to CP/M software, There are still a couple of CP/M UG's around
the country.  It probably wouldn't be a bad idea to sniff around
for some archives; I'll look into it when I have a little time.

BTW:  I have a NorthGate Advantage (with 5mb hard drive) that needs
a home !  Anyone ?? For free ??

Regards,
Jim Barber, N7CXI
[e-mail]


From [e-mail] Wed Oct 04 13:49:33 1995
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From: [e-mail] (Tim TJ)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Hombrew Tutorial
Date: 3 Oct 1995 22:53:09 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <44ssul$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Tim TJ)
NNTP-Posting-Host: newsbf02.mail.aol.com

You have a good idea.  Please share your experiences.  Often construction
articles assume more knowledge or experience than is typical in today's
amateur community.

Thanks and 73,   Tim   KB0XX


From [e-mail] Wed Oct 04 13:49:34 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!news00.sunet.se!sunic!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet
From: Grant H Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for info on theramins
Date: 4 Oct 1995 01:38:53 GMT
Organization: PSI Public Usenet Link
Lines: 50
Message-ID: <44sojd$[e-mail]>
References: <44qejg$[e-mail]> <44rnak$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ip45.ft.worth.tx.interramp.com
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]


>
>The lack of harmonics is easily rectified with a "fuzz" circuit employing
>diodes.

Oh, GROSS.  Why would you want to destroy the unique and wonderful
sould of a perfectly good instrument by this kind of uncool garbage.

>Nowadays, you can create the same effect as
>a theremin with any good synthesizer, although the method of control is
>different.
>

I SERIOUSLY beg to differ -- to get the effect of a theramin, you need a
REAL theramin.  You just can't get the pitch/volune shift effects or
tonality  with a keyboard, mod wheels and CV pedals no matter how good a
player you are.  There is simply no keyboard synth which can properly,
and in any but the most meager and unmusical way, duplicate the sound
that can be extracted from the real thing in a performance situation.  As
far as being monophonic, well, that's just the way it is -- its a solo
instrument.  You can't play cords on a trombone either ...  And I
certainly wouldn't want to listen to one played through a fuzz box.
Yecccch.


For the gentleman who asked the question, there are very modern theramins
which are still available commercially.  Best source would be to call
around to music shops which cater to the professional musician.  They
should be able to put you in the right direction.  Not being a theramin
player by skill or trade,  it would take a while, but I might be able to
find a current reference or two.  I have seen some theramin references
Keyboard or Electronic Musician magazines sometime in the past couple of
years or so.

Rather than posting here to rec.radio.stuff, you should be able to find
an appropriately musical newsgroup on USENET, where you could get some
definitive answers on the subject.  Some of the synth vendors are on line
(Ensoniq, etc.) and they might be willing to point you to a source if you
send to their E-mail.  Also, in the MIDI related forums on Compuserve
there should be some answers, if you have access to that service -- a lot
of expertise there (circuit info, too) and many vendors on-line as well.

You might also check your local library for electronic musical instrument
references -- books in the period 1930-50s or so (I don't really know the
right time periods).

Regards

Grant/NQ5T



From [e-mail] Wed Oct 04 13:49:35 1995
Path: news.epix.net!news.sprintlink.net!parsifal.nando.net!usenet
From: DB Wilhelm <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: multiple freq. filters
Date: 4 Oct 1995 03:02:29 GMT
Organization: News & Observer Public Access
Lines: 14
Message-ID: <44stg5$[e-mail]>
References: <44rjfs$[e-mail]>
NNTP-Posting-Host: grail616.nando.net

[e-mail] (JjdeD Enterprises) wrote:
>
> I need information on a multiple freq. notch filter. It needs to be user
> selectable, and be able to operate in the FM band. Please post replies in
> this newsgroup or email me at [e-mail]
>
I don't know if it will work in your application, but one easy thing
to try is an open 1/4 wavelength stub.  That should look like a
high Q series tuned circuit.  Ship sissors for one time user selection :-)

73,
Don




From [e-mail] Wed Oct 04 13:49:36 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sgigate.sgi.com!enews.sgi.com!decwrl!ablecom!ns2.mainstreet.net!news.isp.net!newsadmin
From: Scott Frankel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for info on theramins
Date: 4 Oct 1995 05:06:08 GMT
Lines: 8
Message-ID: <44t4o0$[e-mail]>
References: <44qejg$[e-mail]>
NNTP-Posting-Host: eb249.slip.net
Mime-Version: 1.0
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X-URL: news:44qejg$[e-mail]

Thanks for the replies!  Found a schematic and am on my way -

Scott
[e-mail]

p.s.  BTW, the vote's in on the spelling:  Leon Theremin.




From [e-mail] Wed Oct 04 13:49:37 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!nntp.cadence.com!turkey!whiting
From: [e-mail] (Neil Whiting)
Subject: Solder + silver conductivity
Message-ID: <[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail]
Organization: Cadence Spectrum Services
Date: Wed, 4 Oct 1995 09:24:32 GMT
Lines: 31

Hi,

I've been build some microwave stuff and find that solder
containing silver (eg 60/38/2% tin/lead/silver) is
recommended for this.

In other descriptions, normal tin/lead solder is said to be
lossy and should not be left around in cavities, etc.

The question (for you materials science types) is this:
Does a 2% silver content in the solder do anything to
sognificantly reduce the (resistive/skin effect) loss of
solder, such that I don't need to worry (so much) about
removing it from cavities, or would the silver content
have to be much higher to do this.

(It may be that this solder is recommended to avoid silver
leaching problems with smd components, rather than for
conductivity reasons?)

73,

Neil


---------------------------------
| Neil Whiting - G4BRK          |
|                               |
| Email:   [e-mail]  |
---------------------------------



From [e-mail] Wed Oct 04 13:49:38 1995
Path: news.epix.net!news.sprintlink.net!globe.indirect.com!bud.indirect.com!marcus
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Euphoria Tape...Try it with a Lover!
Date: 4 Oct 1995 14:16:02 GMT
Organization: Internet Direct, Inc.
Lines: 54
Message-ID: <44u4v2$[e-mail]>
NNTP-Posting-Host: bud.indirect.com
Originator: [e-mail]

I.C.P., Suite 578-101, 5360 E. Bay Dr., Clwr., FL 34624

The Euphoria Tape

Do The Euphoria Tape alone the first time, and then
with a lover. It's a phenomenon you will feel within
the first 3 minutes of use -- what you feel the rest of
the time is unbelievable.

The Euphoria Tape.

It was first whispered about on college campuses, and
only experimented with in seclusion, or among close
friends in private settings, but it has now become a
cult rush and is considered the next passion of our
Cyber lifestyles.

The Euphoria Tape.

Not a drug, not a chemical, but an audio stimulation of
brain centers controlling pleasure. And agony. And ecstacy.
The buzz. An audio mesmer signal strokes the base of the
mind, choking out pain sensations and producing the violent
flow of... euphoria.

The Euphoria Tape.

Copies have changed hands from friends to friends to other
friends. It is not regulated, there are no laws yet restricting
use of The Euphoria Tape.

The Euphoria Tape is rushing the masses.
*************************************************
Stereo audio cassette. Scientific treatment included.

Shipped immediately upon receipt of $11.88
personal check or money order.
Absolute satisfaction guaranteed (and
experienced) or full purchase price refunded.

Offered only to adults 18 years or older.

*******************
IntraNet Cyber Products
Suite 578-101
5360 E. Bay Dr.
Clearwater, FL 34624
*******************

Tape Duplication prohibited.
$2.00 for Scientific Treatment.

Copyright 1995 Intranet Cyber Products, All Rights Reserved.
-------------------------------------------------------


From [e-mail] Tue Oct 10 10:28:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!premier3.premier.net!news.jmls.edu!chi-news.cic.net!news.midplains.net!gw2.att.com!nntpa!zeus!jkbe
From: jkbe@zeus (John_Bednar)
Subject: Re: Anyone know of good 220 Ant.
Message-ID: <[e-mail]>
Sender: [e-mail] (Netnews Administration)
Nntp-Posting-Host: zeus.cnet.att.com
Organization: AT&T
X-Newsreader: TIN [version 1.2 PL2]
References: <44rsbo$[e-mail]> <44s2ia$[e-mail]>
Date: Fri, 6 Oct 1995 16:58:05 GMT
Lines: 16

: [e-mail] (Wayne Allen) wrote:
: >I own a couple 220 Mhz repeaters and I was wondering if anyone has found
: >a good homebrew antenna to use or if anyone knows where to get one cheap
: >that works really well.  Please e-mail me if you have any info.

Allen,

I like stacked dipoles (4 or 8). You can start with Cushcraft
dipoles and replace the phasing harness with one made from
superflex. If you have the time, build an array made from
folded dipoles mounted close to the center mast. The feedpoint
Z will be close to 100 ohms in this configuration. Combining
two folded dipoles with 50 ohm feed line is easy. As I said.....
if you have the time.

John, WB3ESS


From [e-mail] Tue Oct 10 10:28:47 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cascade QRP Kit Supplier Contact Details????
Date: Mon, 9 Oct 1995 16:25:01 -0700
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <[e-mail]>

Hi Ron... Yes indeed I know the supplier of the Cascade QRP kit.  It is
offered by the Northern California QRP through Jim Cates WA6GER.  His
address is:  3241 Eastwood Road, Sacramento, Calif. 95821
The cost is $169.95 in US funds.  The check must be made out to Jim Cates
and not to NorCal.  This price is available to NorCal members only and if
you need to suscribe, it will be $20 more.  The journal is well worth the
price alone.  You will need the journal to obtain the modifications that
this club is noted for.  There is a mod for 40/30 meter out already! 73


On Mon, 9 Oct 1995, Ronald Cruikshank wrote:

> Hello,
> Can anyone give me the contact details (address, phone etc) for the suppliers
> of the Cascade QRP Kit.
> Thanks, 73 VK1NRC.
>
> _______________________________________________________________
> Ron Cruikshank
>
>


From [e-mail] Tue Oct 10 10:28:48 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!uunet!in2.uu.net!jaxnet.jaxnet.com!ns2.mainstreet.net!bug.rahul.net!a2i!sierra.net!news
From: [e-mail] (Eric)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cascade QRP Kit Supplier Contact Details????
Date: Tue, 10 Oct 1995 08:49:58 GMT
Organization: Sierra-Net
Lines: 66
Message-ID: <45dbvu$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 204.94.237.7
X-Newsreader: Forte Agent .99b.112

On Mon, 9 Oct 1995 15:05:30 LOCAL, [e-mail] (Ronald
Cruikshank) wrote:

>Hello,
>Can anyone give me the contact details (address, phone etc) for the suppliers
>of the Cascade QRP Kit.
>Thanks, 73 VK1NRC.
>
>_______________________________________________________________
>Ron Cruikshank

   The Cascade was produced earlier this last year by the NorCal QRP
Club. I am not sure if you can still get one from the "first" run.
Orders had to be in by last June. I don't know what the future holds
for the rig, but I have the following info for you and any others:

   The Cascade was designed by John Liebenrood, K7RO. And only one run
was planned. John may make them available again through a commercial
company {See below}.
                                             John Liebenrood, K7RO
                                             1650 NW 130 AVE
                                             PORTLAND, OR  97229

   Two earlier 'projects' by the NorCal QRP Club are now produced by a
new company started by Bob Dyer, KD6VIO. The company is known as:

                                             Wilderness Radio
                                             P.O. Box 734
                                             Los Altos, CA 94023-0734
                                             [phone]

   They have the NorCal 40A and the multiband CW transceiver called
the NorCal Sierra.  Both are QRP kits. They may be offering the
Cascade sometime.

   The last resort would be to contact:

                                              Jim Cates, WA6GER
                                              3241 EASTWOOD RD
                                              SACRAMENTO, CA  95821

   Jim will probably know about the status of the Cascade. Also if
anyone would like join the NorCal QRP Club and get the journal of the
NorCal QRP Club known as 'QRPp' which discusses these radios, etc.
and is published professionally four times a year, contact Jim at the
above address. If you would like to call him you can E-mail me for the
phone number.

   Also, the NorCal QRP Club will meet and display all kinds of QRP
kits and equipment at:

                                Pacificon '95 Amateur Radio Convention
                                October 20, 21 & 22
                                Concord Hilton Hotel
                                Concord California
                                For more info: [phone]

  Good luck!

73 de KE6IIY

>>>>>>>>>>>>>>>>>>>>
Eric Hutchins  KE6IIY
[e-mail]
>>>>>>>>>>>>>>>>>>>>



From [e-mail] Tue Oct 10 10:28:49 1995
Path: news.epix.net!news.sprintlink.net!fastnet!fastnet!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Ciruit Board Specialists
Date: 8 Oct 1995 15:56:07 GMT
Organization: FASTNET(tm) PA/NJ/DE Internet
Lines: 4
Message-ID: <458san$[e-mail]>
NNTP-Posting-Host: victorj.fast.net
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Does any one know if Circuit Board Specialists"  in Pueblo,co are still in business?

Vic wm3b



From [e-mail] Tue Oct 10 10:28:50 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!mozo.cc.purdue.edu!storm.atms.purdue.edu!bap
From: BRETSKI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: easy keyer circuit needed
Date: Mon, 9 Oct 1995 16:35:24 -0500
Organization: Purdue University
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: storm.atms.purdue.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


Surely there is an easy circuit I can build
to key 700 Hz tones to a speaker.
I want soemthing real simple to practice sending code.


BRET A. PENNINGTON /  COMPUTER TECHNICIAN   /EARTH AND ATMOSPHERIC SCIENCES
CIVL 4252 317-494-0678 / PURDUE UNIVERSITY  / WEST LAFAYETTE, INDIANA 47907
[e-mail]                   /     speaking only for myself.
/\/\/\/\/\/ __... /\/\/\/\/\/\/\/\ N9ZFF /\/\/\/\/\/ ...__ /\/\/\/\/\/\/\/\



From [e-mail] Tue Oct 10 10:28:50 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!snorris
From: [e-mail] (Sean Norris)
Subject: Filter synthesis prog.??
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date: Fri, 6 Oct 1995 21:45:46 GMT
Lines: 19
Sender: [e-mail]


I'm looking for a filter synthesis program. Preferrably for windows and
has the following capabilities.

LPF, HPF, BPF
Butterworh, Chebyshev, Elliptic, Bessel, Transitional Gaussian, etc, (as
many types as possible)
component tolerances for yield analysis would be nice but not neccessary.
graphical schematics would be nice too for use in design reports
Good for RF frequencies
active compnents would be nice as well, but not neccessary.
Fairly reasonable cost or even shareware.

That's about it. I'm doing my own research right now, but if anyone has
some suggestions, I would love to hear them.


Sean



From [e-mail] Tue Oct 10 10:28:51 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!wb3ffv!bbs!Mike.Czuhajewski
From: [e-mail] (Mike Czuhajewski)
Subject: Re: Filter synthesis prog.??
Sender: [e-mail] (Mike Czuhajewski)
Message-ID: <[e-mail]>
Date: Sun, 8 Oct 1995 00:48:33 GMT
Reply-To: [e-mail] (Mike Czuhajewski)
References: <[e-mail]>
X-Posting-Software: UniBoard 2.00beta3 S/N 329931
Organization: ABSnet Internet Services, Inc. - [e-mail] - (410)-361-8160
Lines: 36

There is a good freeware filter synthesis program available at
lehigh.edu via ftp.  It's by Bob Lombardi, titled Filter Design System
or something similar, and the filename is something like FDS124.  It
does low pass, high pass, bandpass, Chebyshev, Butterworth, elliptic,
and is a good one.  (He won honorable mention several years ago when he
submitted an earlier version to RF Design magazine for their annual
design contest.)  There is no analysis available in the program, but
for that I use GPLA, General Purpose Ladder Analysys, by Wes Hayward,
W7ZOI.  It's part of the software suite that comes with the ARRL
reprint of Wes' Intro to Radio Frequency Design.  (True Story:  at
work, one of the other technicians went to a local ham store and bought
the Hayward book specifically to get the software.  For him, the book
was a bonus!)

To get the filter synthesis program, do anonymous ftp to
ftp.lehigh.edu, and dig down the directory tree to

   pub/listserv/qrp-l/tools    [that's QRP-L, not QRP-1, but use
                                lowercase when ftp'ing]

It's been a while since I uploaded a copy of Bobs program there, but I
think the filename I used was FDS124 or something like that.  (Ignore
the short .txt file there; it doesn't say much, and is a very, very
brief quote from the "on-disk" documentation.)  I think it's a PKZIP'ed
file (it's been a while since I uploaded a copy there).

If you use the output to disk function, which in the current version
writes files in the Touchstone format, there are a couple warts; I
mentioned them to the author.  One gives an error which stops
Touchstone from doing a sweep, so you know you have a problem.  The
other will work but give erroneous results, but only involves filters
with different input and output impedances.

This is a very good program, well worth taking a look at.

73 de WA8MCQ


From [e-mail] Tue Oct 10 10:28:53 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.ksu.ksu.edu!hptemp1.cc.umr.edu!dstuart
From: [e-mail] (Dave Stuart ([e-mail]))
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Heathkit
Date: 7 Oct 1995 00:59:38 GMT
Organization: UMR Missouri's Technological University
Lines: 26
Distribution: world
Message-ID: <454jdq$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: rocket.cc.umr.edu
X-Newsreader: TIN [version 1.2 PL2]


: Here ya go Bob:

: Heathkit Co.                  [phone]
: P.O. Box 1288
: Benton Harbor, MI 49023       Some parts & manuals still available

: Heath Replacement Parts       (800) 44-HEATH for free catalog
: 455 Riverview Dr.             FAX: [phone]
: Benton Harbor, MI 49022       Parts [phone]
:                               Repairs 925-3273

: Internet: [e-mail] (Brian Carling)
: This message was processed by NetXpress from Merlin Systems Inc.
: -----------------------------------------------------------------------------


I thought they were out of business?

--
-- Dave Stuart
[e-mail]
University of Missouri -- Rolla

KB0SLY



From [e-mail] Tue Oct 10 10:28:53 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JCHol)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help w/ Power Supply
Date: 10 Oct 1995 05:04:31 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <45dcuv$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (JCHol)
NNTP-Posting-Host: newsbf02.mail.aol.com

It sounds like the zener diode (shown as D3 on my PS-35g) has gone south.
They are cheap-try a replacement and let me know if that doesn't fix it.

73 de John, WA5TWL....


From [e-mail] Tue Oct 10 10:28:54 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: Mon, 9 Oct 1995 16:27:32 -0700
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 14
Message-ID: <[e-mail]>
References: <45aql3$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <45aql3$[e-mail]>

You might keep an eye open for some used CB amps.  They seem to be all
over the swap tables.  These amps ordinarily can be operated from at
least 20 meter thru ten meters.  Far cheaper!  73 Cliff  W6HDO


On 9 Oct 1995, Lord Wisp wrote:

> I am trying to built a linear for my 10 meter radio but cannot find any
> schematics... Can anyone help me or email me with schematics and parts
> lists..
> and where to get them,,, Thanks!!!
>
>
>


From [e-mail] Tue Oct 10 10:28:55 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!newshost.marcam.com!Empire.Net!news.net99.net!news!md
From: [e-mail] (Mike Denton)
Subject: How to Get Free Cable Premium TV .. LEGIT
Message-ID: <[e-mail]>
Organization: GoodNet
Date: Sat, 7 Oct 1995 12:18:05 GMT
Lines: 33

      First I want to say I am sorry that this has nothing
to do with the topic of this group. You may see this
message in other newsgroups, the reason is I am subscribed
to those too so please don't flame me. I have been posting
and reading to this group for a while. I just wanted to
let you people out know there is a way to get Cable TV for
FREE. I recieve this letter in the mail from a friend
that had told me it works. I gave this to one of my friends
and he had free cable in his house within 20 mins. I have not
tried this method yet but may soon try if my cable goes up in
price. If anyone would like a copy send the following to the
address below.

Address Envelope to:

FreeStuff
9393 N. 90th St.
Suite 102-289
Scottsdale, AZ  85258

Enclose in the envelope:

Send...

    $1.00 U.S MONEY    *** NO COINS *** NO CHECKS ***
 inside a sheet of carbon paper or construction paper,
 and send a *self-addressed*,*stamped* envelope to the
 address above.


Thanxs,
Just think if you pay 30$ + a month. 1$ will save
you 359 + dollars a year.


From [e-mail] Tue Oct 10 10:28:56 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!pipeline!psinntp!psinntp!psinntp!interramp.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Impedance of AM car radio
Date: 7 Oct 1995 20:11:34 GMT
Organization: PSI Public Usenet Link
Lines: 10
Message-ID: <456mtm$[e-mail]>
NNTP-Posting-Host: 38.13.121.65
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Anyone know impedance of AM car radio antenna input ?, is it 50 ohms ?.
I am designing a convertor and can not find info I need .

Please resond via Email....TNX      WB9EZB


FROM==>Michael Franks, MD
  [e-mail]




From [e-mail] Tue Oct 10 10:28:57 1995
Path: news.epix.net!news.sprintlink.net!news.eznet.net!usenet
From: [e-mail] (John R. Cunliffe)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of AM car radio
Date: Sun, 08 Oct 1995 00:55:22 GMT
Organization: E-Znet Inc. Rochester N.Y. 14623 (716)-262-2485
Lines: 27
Message-ID: <4577re$[e-mail]>
References: <456mtm$[e-mail]> <457751$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dialin-26.eznet.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (W8JI  Tom) wrote:

>In article <456mtm$[e-mail]>, [e-mail]
>writes:

>>
>>Anyone know impedance of AM car radio antenna input ?, is it 50 ohms ?.
>>I am designing a convertor and can not find info I need .
>>
>>Please resond via Email....TNX      WB9EZB
>>
>>

>No it's sure not 50 ohms, it's usually very high Z. The antenna it matches
>is a short unloaded voltage probe, so the input of the rx has to be very
>high Z to not load it.

>73 Tom


The cable used on car antennas is 125 ohm's or 93 ohm's dependend what
manufacturer used.
   John R. Cunliffe   N2NEP
   [e-mail]
   fax# [phone]
   http://home.eznet.net/~cunliffe/



From [e-mail] Tue Oct 10 10:28:58 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!cs.utexas.edu!not-for-mail
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Impedance of AM car radio
Date: 10 Oct 1995 08:19:17 -0500
Organization: UTexas Mail-to-News Gateway
Lines: 12
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: news.cs.utexas.edu

In article <456mtm$[e-mail]>, [e-mail]
writes:
>Anyone know impedance of AM car radio antenna input ?, is it 50 ohms ?.
>I am designing a convertor and can not find info I need .

Generally the impedance of an AM/FM car radio is about 75 ohms.
Impedance of the "old" AM only radios (transistor) was also about 75
ohms.  The really old (tube) AM radios had an impedance of between
75 and about 95 ohms.

Kevin, WB5RUE
[e-mail]


From [e-mail] Tue Oct 10 10:28:59 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!woodhill.demon.co.uk
From: [e-mail] (Bob Carter)
Newsgroups: rec.radio.amateur.homebrew
Subject: jota !help!!!! - jott.txt (1/1)
Date: Sun, 08 Oct 1995 16:32:59 GMT
Organization: Woodhill Creativity
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: woodhill.demon.co.uk
X-NNTP-Posting-Host: woodhill.demon.co.uk
X-Newsreader: Forte Free Agent 1.0.82

begin 644 jott.txt
M#0H-"@T*"4-A;B!A;GEO;F4@<&QE87-E(&AE;'`@;64_#0H-"@E/;B!T:&4@
M=V5E:V5N9"!O9B!/8W1O8F5R(#(Q<W0@=&AE(%-C;W5T(&UO=F5M96YT(&ES
M(&EN=F]L=F5D(`EI;B!T:&4@2F%M8F]R964@3VX@5&AE($%I<B`H2D]402DN
M(%=E(&%T('1H92!0:&]E;FEX(%9E;G1U<F4)"55N:70@*$ME;G1O;B`F($MI
M;F=S8G5R>2!$:7-T<FEC="D@:&%D(&%R<F%N9V5D(&9O<B!A(&QI8V5N8V5D
M(`ER861I;R!O<&5R871E<B!A;B!A(&9E=R!O9B!H:7,@8V]L;&5G=65S('1O
M('5S92!O=7(@56YI="!$96X@87,@"6$@8F%S92!F;W(@82!R861I;R!S=&%T
M:6]N+B!792!H879E(&UA9&4@86QL('1H92!A<G)A;F=E;65N=',@"69O<B!M
M87-T<R!A;F0@=VER97,@=&\@8F4@<W1R=6YG(&9O<B!A97)I86QS('1E;&5P
M:&]N92!L:6YE<R`)971C+B!B=70@:&4@:&%S(&IU<W0@8F5E;B!G:79E;B!T
M:&4@8V]M<&QE=&EO;B!D871E(&9O<B!M;W9I;F<@"6AO=7-E(&%N9"!I="!I
M<R!T:&%T('=E96ME;F0L('1H97)E9F]R92!W92!A<F4@=VET:&]U="!A(`EL
M:6-E;F-E9"!O<&5R871O<BX@27,@=&AE<F4@86YY8F]D>2!O<B!A(')A9&EO
M(&=R;W5P('1H870@=V]U;&0@"6QI:V4@82!C:&%N9V4@;V8@=F5N=64@=VET
M:"!O<'!O<G1U;FET:65S(&9O<B!N97<@8V]N=&%C=',@=&AA="`)=V]U;&0@
M8F4@=VEL;&EN9R!T;R!H96QP('5S(&]U="P@=&EM92!I<R!O9B!T:&4@97-S
M96YC92!W:71H(`ER96=A<F0@=&\@87)R86YG96UE;G1S(&%N9"!L:6-E;F-E
M<R!E=&,N($EF('EO=2!C86X@:&5L<"!O<B`)<F5Q=6ER92!A;GD@9G5R=&AE
M<B!D971A:6QS('!L96%S92!R97!L>2!A<V%P+@T*"0T*"4)O8F-`=V]O9&AI
M;&PN9&5M;VXN8V\N=6L-"@E";V)C0')O=F5R9&5N+F1E;6]N+F-O+G5K#0H)
>4F]B97)T+D-A<G1E<D!D;W,N=7,M<W1A=&4N9V]V
`
end


From [e-mail] Tue Oct 10 10:29:01 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!sunic!sunic.sunet.se!seunet!news2.swip.net!news.algonet.se!usenet
From: [e-mail] (Christer Johansson)
Newsgroups: sci.electronics,comp.robotics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: List of Stamp Applications
Date: Fri, 06 Oct 1995 18:16:02 GMT
Organization: HTH
Lines: 72
Message-ID: <453v6v$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sophocles.algonet.se
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net sci.electronics:155466 comp.robotics.misc:1333 rec.radio.amateur.homebrew:11011 rec.radio.amateur.misc:92739


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

When there are a bunch of contributions I'm going to post the L.O.S.A
to this list, upload it to Parallax, Inc. FTP-site and send it to the
following Usenet groups. I will update it approx. once a month.

sci.electronics
comp.robotics.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

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon - Christer Johansson - * email: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
    >> World Wide Web - http://www.algonet.se/~cj/catalog.html <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Tue Oct 10 10:29:02 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!uni-regensburg.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Litz Wire
Date: 6 Oct 95 11:52:55 GMT
Organization: University of the Federal Armed Forces Munich
Lines: 19
Message-ID: <claude.812980375@bauv111>
References: <4424gd$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de
Keywords: Litz Wire
X-Newsreader: NN version 6.5.0 #7 (NOV)

[e-mail] (Drew Diamond) writes:


>>Can anyone tell me where I can purchase, mail order or otherwise, Litz
>>wire.

>>Thanks.

>>[e-mail]

>Interestingly, I see Litz type wire now used extensively in HF switched-mode
>power supply transformers.

No surprise. They are the best choice for this frequency range.
--
Claude F. ([e-mail])

This message may contain opinions which are not shared by my employer.
The facts can speak for themselves.


From [e-mail] Tue Oct 10 10:29:02 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!newshost.marcam.com!usc!elroy.jpl.nasa.gov!swrinde!tank.news.pipex.net!pipex!in2.uu.net!jazz!butch
From: [e-mail] (' ALLAN W. BART)
Subject: Looking for Hamcomm 3
Message-ID: <[e-mail]>
Organization: Maestro Technologies, Inc.
X-Newsreader: TIN [version 1.2 PL0]
Date: Sun, 8 Oct 1995 20:06:37 GMT
Lines: 10

Hello,

I have heard that there is a newer version of Hamcomm that includes
amtor, is it available on the internet? should you know please let me
know via email.

yours,

allan bart
WA2RZQ


From [e-mail] Tue Oct 10 10:29:04 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in1.uu.net!newsfeed.internetmci.com!lamarck.sura.net!osceola.cs.ucf.edu!longwood.cs.ucf.edu!not-for-mail
From: [e-mail] (Tom Clarke)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: looking for info on theramins
Date: 9 Oct 1995 11:24:03 -0400
Organization: University of Central Florida
Lines: 27
Message-ID: <45beqj$[e-mail]>
References: <44qejg$[e-mail]> <[e-mail]> <a87cb$[e-mail]>
NNTP-Posting-Host: longwood.cs.ucf.edu

Stephens <[e-mail]> writes:

>The spelling for the device is theremin.  That may help your searches.

>Over 20 years ago, I dabbled with theremins.  Most of them were based on the idea that a human hand placed near an antenna can change the capacitance of

>Most of the flying-saucer sounds from science fiction movies of the 1950's were made with theremins.

Try this web page:

http://www.vuse.vanderbilt.edu/~jbbarile/theremin.html

If you can't web, the owners address is

[e-mail]

He can tell you how to ftp file with theremin articles
and schematics etc.

Tom Clarke



--
  People of the same trade seldom meet together, even for merriment
  and diversion, but the conversation ends in a conspiracy against
  the public, or in some contrivance to raise prices - Adam Smith, WofN


From [e-mail] Tue Oct 10 10:29:04 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Ted Viens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making labels from transparencies
Date: 7 Oct 1995 11:58:32 GMT
Organization: Netcom
Lines: 24
Message-ID: <455q18$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-hou5-13.ix.netcom.com
X-NETCOM-Date: Sat Oct 07  4:58:32 AM PDT 1995

In <[e-mail]> [e-mail] (John A. Thomas)
writes:
>
>Has anyone had experience making panel labels for projects using
laser-
>printed transparencies?  With Word for Windows, I can align and print
>very nice labels.  The only problem is gluing them to a panel.
Nothing I
>have tried (rubber cememt, contact cement, crazy glue, airplane
cement)
>seems to stick.  I assume the plastic is mylar.
>
>Any ideas?
>
>John A. Thomas
>[e-mail]
>N5RZP
---
Avery sells "Clear Laser Labels" product number 5661 which may make the
whole thing a lead pipe cinch.  Haven't tried it myself yet, just a
suggestion...
--
Bye...  Ted..
Deep in the Heart of the Armpits of Houston, Texas...


From [e-mail] Tue Oct 10 10:29:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!bubba.ucc.okstate.edu!news.cis.okstate.edu!gcouger
From: [e-mail] (Gordon Couger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making labels from transparencies
Date: 8 Oct 1995 07:52:21 GMT
Organization: Biosystems and Agricultural Engineering
Lines: 19
Message-ID: <457vvl$[e-mail]>
References: <[e-mail]>
Reply-To: Gordon Couger <[e-mail]>=
NNTP-Posting-Host: jsun.agen.okstate.edu

In article <[e-mail]>,
John A. Thomas <[e-mail]> wrote:
>Has anyone had experience making panel labels for projects using laser-
>printed transparencies?  With Word for Windows, I can align and print
>very nice labels.  The only problem is gluing them to a panel.  Nothing I
>have tried (rubber cememt, contact cement, crazy glue, airplane cement)
>seems to stick.  I assume the plastic is mylar.
>
What I have done is to use plain paper in the printer. I use a deskjet 540
and cover one side with  clear packing tape or coat it with clear spray
paint after gluing it to the panel with contact cement or mounting spray.

good luck
Gordon AB5DG
Gordon Couger - Biosystems & Ag Engineering Oklhoma State Univ.
         114 Ag Hall, Stillwater, OK 74078
         Home 624 Cheyenne, Stillwater, OK 74075
[e-mail] 405-624-2855 evenings 405 744 8392 work
    I do not speak for my employer


From [e-mail] Tue Oct 10 10:29:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!iafrica.com!ticsa.com!cstatd.cstat.co.za!usenet
From: [e-mail] (James Bestbier)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making labels from transparencies
Date: Sun, 08 Oct 1995 17:49:45 GMT
Organization: Internet Africa
Lines: 23
Message-ID: <45928i$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: slipper124254.iaccess.za
X-Newsreader: Forte Free Agent v0.55

[e-mail] (John A. Thomas) wrote:

>Has anyone had experience making panel labels for projects using laser-
>printed transparencies?  With Word for Windows, I can align and print
>very nice labels.  The only problem is gluing them to a panel.  Nothing I
>have tried (rubber cememt, contact cement, crazy glue, airplane cement)
>seems to stick.  I assume the plastic is mylar.

>Any ideas?

>John A. Thomas
>[e-mail]
>N5RZP
Get hold of a product called TEC-200 film. It is used  to transfer pcb
images onto copper clad board but it will work very well for your
need.
Place the film in the printer, print the designs onto the film, place
the film on your panel and apply heat and pressure (a regular clothes
iron works fine). After a few seconds,and after the panel has cooled,
the film is removed and the image stays behind.
Contact Meadowlake Corp at P O Box 1555 ONECO FL 34264.
James Bestbier ZS1XN  [e-mail]



From [e-mail] Tue Oct 10 10:29:07 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Koert Koelman )
Newsgroups: rec.radio.amateur.homebrew
Subject: Manual for Eico 324 Signal Generator
Date: 8 Oct 1995 07:17:25 GMT
Organization: Netcom
Lines: 11
Message-ID: <457tu5$[e-mail]>
NNTP-Posting-Host: ix-pa1-20.ix.netcom.com
X-NETCOM-Date: Sun Oct 08 12:17:25 AM PDT 1995

Hi:

Do any of you have a manual for an Eico 324 signal generator?  I picked
one up at a flea market without a manual.

Of course, I will gladly reimburse you for copying costs and postage.
Let me know if you could send me a copy.  Thanks.

                73/KC6WCI@N0ARY.#NOCAL.CA.USA.NOAM




From [e-mail] Tue Oct 10 10:29:08 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!news1.digital.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Mini linier
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]>
Date: Sat, 7 Oct 1995 09:59:38 GMT
Lines: 17
Sender: [e-mail]

Paul Erickson ([e-mail]) wrote:
: I was looking through the junk box and came across a 6146b and was
: wondering if anyone has had any experience with or ideas about using
: one of these as a linier for my qrp rig???


If you have a power supply available, or the parts to build one then it
would be a fun project. You will need something in the neighborhood of
(roughly) 700 volts at 200 mA. Depending on frequency you should get
about 40 or 50 watts output. It might be cheaper to build an amplifier
from solid state components if you can't scrape together a power
supply.

73,

Thomas
KI4N


From [e-mail] Tue Oct 10 10:29:09 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!lafn.org!lafn.org!ag001
From: [e-mail] (Abraham Stavsky)
Subject: Need a power supply person!
X-Nntp-Posting-Host: lafn.org
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: Los Angeles Free-Net
Date: Sun, 8 Oct 1995 04:05:24 GMT
Lines: 8


Any problem of using a 13v dc power supply putting out 10.4w
with an HTX-202? It's actually a cell phone intellicharge power
supply; could it double as a p.s. for an HTX-202?  Any ideas?
I don't know what the amperage is though, not listed.
Thanks
KE6OCM
--


From [e-mail] Tue Oct 10 10:29:10 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.moneng.mei.com!daily-planet.execpc.com!sundog.tiac.net!news.kei.com!travelers.mail.cornell.edu!news.tc.cornell.edu!newsserver.sdsc.edu!acsc.com!kaiwan.kaiwan.com!ledge!darryl.linkow
From: [e-mail] (DARRYL LINKOW)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Kenwood TR-7950 manu
Message-ID: <[e-mail]>
Date: Sat, 07 Oct 95 11:39:00 -0800
Distribution: world
Organization: The Ledge PCBoard: Lake View Terrace, CA: USA: 818-896-2007
Reply-To: [e-mail] (DARRYL LINKOW)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 11


Hello all and thanks for reading this message.  I am looking for
a copy of the owner's manual for a Kenwood TR-7950 2 Meter rig for
a friend of mine, KE6JWQ, who does not have Internet access.  If
you have one to sell, please let me know.  Or, if you can make a
photocopy, he would gladly pay for copying and postage.  Please
leave me a message here if you can help.
     73, Darryl KE6IHA

---
 * OLX 2.2 * Darryl Linkow [phone]  9 am - 5 pm PDT


From [e-mail] Tue Oct 10 10:29:11 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!eskimo!novatech
From: [e-mail] (Steven Swift)
Subject: Re: Need microwave/stripline design text
X-Nntp-Posting-Host: eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: Eskimo North (206) For-Ever
X-Newsreader: NN version 6.5.0 CURRENT BETA (06/24/1995) #4
References: <[e-mail]>
Date: Fri, 6 Oct 1995 20:17:40 GMT
Lines: 25

[e-mail] (Bill VanRemmen) writes:

>I will be doing a project soon that will involve quite a bit of striplines.

>Can someone point me to any articles or texts on designing these things?
>Emphasis on construction would be best, but if I have to slog through
>a DECENT EE text, that's ok too.

>-----------------------------------------------------------------------------
>Oh, I'm a sysadmin, and I'm ok.                | Bill VanRemmen, KA2WFJ
>I work all night and I work all day.   | [e-mail]
>I knock back Cokes, I skip my lunch,   | http://www.pas.rochester.edu/~bill
>I'm glued to the VDT!                  |
>-----------------------------------------------------------------------------

This isn't a stripline book, but rather a microstrip book.  I think you
will find it useful:

        Foundations fo Microstrip Circuit Design, 2nd Ed, Terry Edwards,
        Wiley, 1992, 0-471-93062-8.

--
Steven D. Swift, [e-mail], http://www.eskimo.com/~ntsales
NOVATECH INSTRUMENTS, INC.      1530 Eastlake Avenue East, Suite 303
206.322.1562, fax [phone]  Seattle, Washington 98102 USA


From [e-mail] Tue Oct 10 10:29:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!bcarh8ac.bnr.ca!nrchh52.rich.nt.com!crchh327.rich.bnr.ca!b4pph13e!cnc23a
From: [e-mail] (Ken Edwards)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Need technical info on duplexers.
Date: 9 Oct 1995 12:19:02 GMT
Organization: Bell-Northern Research, Ottawa, Canada
Lines: 21
Distribution: world
Message-ID: <45b3vm$[e-mail]>
NNTP-Posting-Host: b4pph13e.bnr.ca
Xref: news.epix.net rec.radio.amateur.homebrew:11036 rec.radio.amateur.misc:92860

Hello

I am taking a graduate course in a local university that requires a
'project'.  I would like my project to be a paper design on a 900 Mhz
duplexer.  Are there any technical papers, articles, books I could
use as a reference to complete my project.  (The ARRL antenna handbook
was a GOOD beginning reference, but I am looking for the 'theory and
math' behind the designs).


Thanks...

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

Ken M. Edwards, PE  Bell Northern Research, Research Triangle Park, NC
[phone] email: [e-mail]    Ham: N4ZBB   Packet: [e-mail]
DX PacketCluster (tm) Node : W4DW

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] Tue Oct 10 10:29:13 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need X-Band waveguide
Date: 7 Oct 1995 05:47:00 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 9
Sender: [e-mail]
Message-ID: <455iak$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am looking for the following X-Band parts:

   1) Flexible waveguide UG39 flange any length considered.

   2) Right angle waveguide UG39 flange

 Please respond by Email or phone: [phone] eves or 203-573-5581 days
 73's Viny



From [e-mail] Tue Oct 10 10:29:14 1995
Path: news.epix.net!news.sprintlink.net!usit.net!usenet
From: [e-mail] (Kevin Kidd)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Odd behavior of 4CX1000A
Date: Fri, 06 Oct 1995 15:37:40 GMT
Organization: United States Internet, Inc.
Lines: 42
Message-ID: <453ihb$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: lpcserv.usit.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Bill Turner) wrote:

>I have just finished a homebrew amp using a 4CX1000A and it works fine, with
>one small exception:  The plate current drifts a bit depending on the
>temperature of the tube.  For example, I have the idling plate current set at
>250 ma as recommended by the Eimac data sheet, but when I drive it to full
>output (1500 watts) and then remove the drive, the plate current drops back to
>about 220 ma and then climbs back up to 250, taking about five seconds or so.
> I can also see this after I have it tuned up -- I apply drive (continuous
>carrier) and the plate current rises to the normal 800 ma or so, then drifts
>down about 20-30 ma and stabilizes there.  This drift is NOT in any of the
>supply voltages.  It's definitely in the tube itself.  The supplies are:
>Plate:  3000 volts loaded, 3400 volts unloaded
>Screen:  355 volts (shunt regulated)
>Control grid:  -62 volts (for 250 ma idle)
>Filament:  6.1 volts

>Is this normal behavior or do I have a tube starting to go bad?  The tube is
>an old one (1960's era), but the fellow I got it from said he won it at a
>hamfest and it's been mostly sitting on a shelf all this time.

>Anyone have a known good one for sale?  Wouldn't hurt to have a spare, I
>suppose.


>73, Bill W7LZP
>[e-mail]


YOUR FILIMENT VOLTAGE COULD BE DROPING DUE TO EXCESSIVE INPUT VOLTAGE
DROP.  IF THE FILIMENT VOLTAGE IS AT OR BELOW THE KNEE OF FULL
EMMISSION AND THEN DROPS AS LITTLE AS .1 VOLT THE PLATE CURRENT WILL
TAKE A SUBSTANTIAL DROP.  CHECK THE FILIMENT VOLTAGE WITHOUT TX KEYED
AND WITH TX KEYED.  VOLTAGE SHOULD NOT DROP BELOW RATINGS FOR THIS
TUBE.  ALSO OPERATING A TUBE WITH INSUFFICIENT FILIMENT VOLTAGE IS
ACTUALLY HARDER ON SAID TUBE THAN OVER VOLTAGE (TO A POINT ANYWAY).

73

KEVIN, WD4RAT
[e-mail]



From [e-mail] Tue Oct 10 10:29:15 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.iadfw.net!usenet
From: [e-mail] (J. Fred Riley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Odd behavior of 4CX1000A
Date: Sat, 07 Oct 1995 15:10:07 GMT
Organization: Internet America
Lines: 26
Message-ID: <4565k7$[e-mail]>
References: <[e-mail]> <453ihb$[e-mail]>
NNTP-Posting-Host: dal07-02.ppp.iadfw.net
X-Newsreader: Forte Free Agent v0.55

>[e-mail] (Bill Turner) wrote:

>>when I drive it to full
>>output (1500 watts) and then remove the drive, the plate current drops back to
>>about 220 ma and then climbs back up to 250

>YOUR FILIMENT VOLTAGE COULD BE DROPING

Naw, this tube uses an oxide-coated cathode.  But it also has a grid
rated for 1 ma; no wattage rating at all.  The behavior being
described is pretty much what I was used to seeing when I ran my 30S-1
up into grid current.  Grid leak would shove the bias up and the time
constant of the bias circuit was quite long.  That doesn't eliminate
the possibility that something's happening at the cathode--especially
when you say the output power is 1.5 KW.  The extra current might be
changing the emissivity of the cathode.  I did not see this effect
when I switched over to 4CX1500B's (unless I went into grid current)
so the grid might be involved too.

73

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



From [e-mail] Tue Oct 10 10:29:16 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Odd behavior of 4CX1000A
Date: 7 Oct 1995 20:19:58 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <4575fe$[e-mail]>
References: <4565k7$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4565k7$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>t the cathode--especially
>when you say the output power is 1.5 KW.  The extra current might be
>changing the emissivity of the cathode.  I did not see this effect
>when I switched over to 4CX1500B's (unless I went into grid current)
>so the grid might be involved too.
>
>73
>
>Fred

Fred's correct about this. I've seen the same effect in 8877's also. It's
a common mox cath problem when the tube is near its ratings.

73 Tom


From [e-mail] Tue Oct 10 10:29:17 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!nntpgate.primenet.com!nntpdist.primenet.com!lager
From: [e-mail] (Woody Harper)
Newsgroups: rec.radio.amateur.homebrew
Subject: OK, 49MHZ to 6 meter: HELP!!!
Date: 7 Oct 1995 22:47:06 GMT
Organization: Primenet [phone]
Lines: 13
Message-ID: <45701a$[e-mail]>
NNTP-Posting-Host: usr2.primenet.com
NNTP-Posting-User: lager
X-Newsreader: TIN [version 1.2 PL2]

I just dug up a pair of 49MHz walkie talkies and am interested in
converting them to 6m operation. These are GE Starcode 11 units and have
a flexible antenna and a code key. I opened one up to check out the guts.
The xtal is marked 49.875 (If memory serves). Is the mod as simple as
re-crystalling this little guy? I am very curious about this and would
like to experiment. All help is appreciated.

Woody KC7???

--
-------------------------------------------------------------------------------
Home Page: http://www.primenet.com/~lager



From [e-mail] Tue Oct 10 10:29:18 1995
Path: news.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: R2 Single Signal Single Conversion Receiver - Experiences?
Date: 6 Oct 1995 14:41:57 GMT
Organization: UniSQL, Inc.
Lines: 35
Message-ID: <453f7l$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

I have an R2 / T2 pair "in the works"  (well, actually, buried in the
junkbox until after the next time I move).

1)  Order the commercially made circuit boards!!
2)  Follow the parts recommendations in the articles, especially for the
        capacitors.  For the phasing filters, a lot of same-value, different-
        part-number caps WILL NOT FIT, either in the PCB holes or in the
        spaces between the components.
3)  If you can custom-match the phasing L and C parts, you'll get a better
        performing rig.  You need an LCR bridge or similar, and probably
        10 friends who are also building R2 / T2 projects to get rid of
        all the extra parts you'll need to buy to get good matching components.
4)  I had no problem whatsoever getting parts, but at the time I was living in
        the Dallas/Ft. Worth area, and had excellent access to a number of
        well-stocked surplus houses.  Digi-Key and Mouser provided excellent
        service for the mail-order parts they stocked.  For the Mini-Circuits
        mixers, I was able to find some at a swap fest.  However, Mini-Circuits
        accepts small orders and Visa/MC.  For convenience you may want to
        batch your order with those of your 10 friends...and ask for the
        RF Designer's Guide, and order some of their other fun RF goodies
        like MMICs.
5)  Read the instructions carefully, look at the diagrams until you've
        memorized them, and be advised that there was at least one correction
        printed in QST a few months after the R2 plans were published.
6)  Although it's mentioned in the plans, it bears repeating -- socket the ICs
        or you will never be able to get them out of the PCB if you have a bad
        one or a failure later.

Hope this helps

Jim
N6OTQ

flames to /dev/null please



From [e-mail] Tue Oct 10 10:29:19 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: Re: R2 Single Signal Single Conversion Receiver - Experiences?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]>
Date: Sun, 8 Oct 1995 03:37:45 GMT
Lines: 25
Sender: [e-mail]

Dave Fifield <[e-mail]> writes:

>Hi,

>Have any of you built an R2 direct conversion receiver at all? This was
>published in 1992 in QST: basically it was a "phasing" SSB receiver.

>I'd be interested in exchanging experiences with other builders ...
>especially on sourcing of components, local oscillators tried (DDS
>anyone?) and DSP'ing the backend of the receiver.

>PSE KKK

>Dave Fifield (ex G8INR)

Kits are available from Kanga US -- write [e-mail] for information.

Check out my Web page for lots of documentation on my setup with the R2:
http://www.lehigh.edu/lists/qrp-l/k0jd/index.html . The various files are
also ftp accessible.

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing
:                                  / Di dah, di dah, di dah, di dah...



From [e-mail] Tue Oct 10 10:29:20 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: Dave Fifield <[e-mail]>
Subject: Re: R2 Single Signal Single Conversion Receiver - Experiences?
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
Sender: [e-mail] (netnews maintenance)
Nntp-Posting-Host: dfifield.nsc.com
Content-Transfer-Encoding: 7bit
Organization: National Semiconductor Corp.
References: <[e-mail]>
Mime-Version: 1.0
Date: Mon, 9 Oct 1995 21:06:28 GMT
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Lines: 29

I've received a couple of emails in addition top the replies posted here.

There seems to be quite a lot of "extra" information available! I'm glad I
asked!

I designed and made my own PCB last week - I added the "other" sideband
circuit on-board and put right-angled BNCs on the inputs. I changed the
biasing of the audio amp and reduced the quiescent current to 20mA (I
heard from others who have done this too). I made the board "double
sided", the top is a ground plane...I have always found that this method
of construction works best.

It fired up first time and it seems to have pretty decent opposite
sideband surpression. I am still playing around with VFOs. I just saw a
nice DDS design in October's 73 Amateur Radio Today. I might make a
version of this as an experiment.

By the way, Digikey's prices for the inductors for the R1/2 & T2 designs
are not the best. I get mine from the UK, a place called Cirkit, who'll do
credit card orders and air mail them over. They arrive in about 3 days and
it costs about $8 for the shipping (not much more than continental USA!).
Anyway, they charge 62p per 10RB inductor, that's $1 approx.....Digikey's
price is around $3.50 I think! This place, Cirkit, has lots of other
interesting RF things too - they are the main UK outlet for Toko. It's
worth getting a catalogue shipped to you. Phone number is
011-44-1992-444-111 (Sales) or 011-44-1992-464-457 (Switchboard).

More later....



From [e-mail] Tue Oct 10 10:29:21 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Solder + silver conductivity
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Wed, 4 Oct 1995 16:26:54 GMT
Lines: 22

In article <[e-mail]> [e-mail] writes:
>
>(It may be that this solder is recommended to avoid silver
>leaching problems with smd components, rather than for
>conductivity reasons?)

Bingo! Silver solder (2%) isn't markedly more conductive
than ordinary soft solder, but the silver content does reduce
leaching problems. It also offers a bit better mechanical
bond. In contrast, high silver content *hard* solder gives
a much stronger bond, and is also much more conductive, but
the melting point is too high for most electronic applications,
but not for things like cavity finger stock or finger stock
used for tube contacts. Then *hard* silver solder is just
the ticket (you need a torch).

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 Oct 10 10:29:24 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!vectorbd!jpll
From: [e-mail] (Jim Lill)
Subject: Re: Unwanted FM station
Organization: Vector Board BBS
Date: Thu, 5 Oct 1995 21:54:39 GMT
Message-ID: <[e-mail]>
X-Newsreader: TIN [version 1.2 PL2]
References: <446n6t$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Lines: 67

Here's some better related info

Free space path loss is

Lfs(db) = 37 + 20*log(d) + 20*log(F)

where d is distance in miles, and F is frequency in MHz.

For 30 miles and 444 MHz, the free space path loss is 119.49 db.

>Also, What is the calculation for figuring how much gain in the antenna I'll
>need and beamwidth etc.....

Well you need to know the required signal strength at the receiver to
achieve a 20 db quieting. That's typically in the 0.5 microvolt range.
Applying P=E^2/R, and assuming a system input impedance of 50 ohms,
we have a required signal level at the receiver of -143 dbW. With a
one watt transmitter, we're starting with 0 dbW, and must subtract
path loss from that giving a signal of -119.49 dbW at the receiver
with *no antenna gain*. That's a fade margin of 23.51 db with isotropic
antennas at each end. So if you *really* have a free space path between
the sites, simple 1/4-wave omni antennas will suffice. To determine
the signal level at the receiver, you apply the following formula,

Er = sqrt((10*10^(Txp + (Txant-TFeed) - PL + (Rxant-RFeed)))/50)

Where Er is in volts, Txp is transmit power in dbW, Txant is transmit
antenna gain in db, TFeed is feedline loss in db, PL is path loss in
db, Rxant is receive antenna gain in db, and RFeed is feedline loss
in db.

Now you probably *don't* really have line of sight between the sites.
30 miles is near the radio horizon for an antenna 1000 feet HAAT. So
you'll have additional loss. You have to figure loss from objects in
the path, such as trees, houses etc. And if you really have terrain
blockage, say by a ridgeline, then you'll be communicating by forward
scatter or tropo. An equation that will give path loss in the forward
scatter case is as follows,

Lsc = 126 + 30*log(F) + 20*log(d) + 10*A - 0.2*N

Where F is frequency in MHz, d is distance in miles, A is the scatter
angle in degrees, and N is the radio refractive index of air over the
scattering path.  N is expressed as

N = 77.6*P/T + 3.73*10^5*e/T^2

Where P is pressure in millibars, T is temperature in Kelvins, and
e is water-vapor pressure in millibars. Typical sea level value for
N is 324.

Working your problem with a scatter angle of 1 degree, we get a
path loss of 180.16 db. So you'll need combined antenna gains at
the transmitter and receiver of 37 db to make the trip on 1 watt.
Increasing transmit power to 45 watts (16.5 db) would help considerably,
allowing antennas with 10 db over isotropic on each end.

Tropo ducting will allow path loss to fall somewhere between the line
of sight case and the pure forward scatter case.

Gary Coffman KE4ZV

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

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jim Lill      [e-mail]       wa2zkd@wb2psi.#wny.usa.na



From [e-mail] Tue Oct 10 10:29:25 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!g6iqm.demon.co.uk
From: Michael J Wooding <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF Communications Magazine
Date: Sun, 08 Oct 1995 19:04:19 GMT
Organization: None
Lines: 32
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: g6iqm.demon.co.uk
X-Broken-Date: Sunday, Oct 08, 1995 19.04.19
X-Newsreader: Newswin Alpha 0.7

Hi There,

To all subscribers issue 3/1995 of VHF Communications magazine will be
shipped Monday Oct. 9th.  We apologise for the slight delay, but as they say
in the best circles, this was due to circumstances beyond our control - in
fact our printing house had a major machine failure.

To anyone who is not a subscriber to the magazine, it is a publication for
the Radio Amateur Worldwide, especially covering VHF, UHF and Microwaves.
95% of the contents are construction projects with a full backup with PCB's
and/or kits.  The worldwide subscription rate is UKP15.00 by cheque or
UKP15.75 by credit card or bank transfer.

To whet your appetite the contents of the latest issue include:

A Frequency Counter with Harmonic Mixing
200mW GaAsFET Amplifier for 24 GHz
Part-6 of a DIY Receiver for GPS and GLONASS Satellites
Linear Signal Rectification

For further information please send me an email.

Regards ... Mike

--
Michael J Wooding   [e-mail]
CompuServe: 100441,377
Tel: [phone]   Fax: [phone]
KM Publications, 5 Ware Orchard, Barby, Nr.Rugby, CV23 8UF, UK
VHF Communications Magazine - Especially Covering VHF, UHF and Microwaves



From [e-mail] Tue Oct 10 10:29:26 1995
Path: news.epix.net!news.sprintlink.net!newsboy.utelfla.com!newsboy.utelfla.com!news.iag.net!usenet.eel.ufl.edu!spool.mu.edu!daily-planet.execpc.com!news.moneng.mei.com!news.ecn.bgu.edu!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 Microwave Power Devices Amp
Followup-To: rec.radio.amateur.homebrew
Date: Mon, 09 Oct 1995 08:25:24 -0700
Organization: Qualcomm
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: kbanke-mac.qualcomm.com

I have a couple of military surplus Microwave power Devices Inc amplifiers
I would like to attempt to use for Amateur purposes. The info supplied
indicate its a 960-1215 MHz amplifier/modulator capable of 1 Kw peak pulse.
It appears to run on 115 VAC 400 Hz 3 phase. The model number is
SPWA9612-13/4880. Does anyone have connection information for the control
inputs on this unit or other info?
 - Kerry N6IZW [e-mail] -


From [e-mail] Fri Oct 13 21:07:11 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!waikato!news.massey.ac.nz!sysadmin
From: [e-mail] (Peter Dalliessi)
Newsgroups: rec.radio.amateur.homebrew
Subject: "SINADDER" signal+noise+distortion meter
Date: Thu, 12 Oct 1995 20:36:06 GMT
Organization: Massey University, Palmerston North, New Zealand
Lines: 18
Message-ID: <45ju7l$[e-mail]>
NNTP-Posting-Host: sis-dalliessi.massey.ac.nz
X-Newsreader: Forte Free Agent 1.0.82


Does anyone know where I can find the design for a s/n+dist. measuring
instrument?

Such a device was made by a US company many years ago, and named a
"SINADDER3".

There must be any amount of designs out there somewhere. Any help
would be greatly appreciated.

Thanks in advance.

Peter Dalliessi, ZL4MS,
Massey University,
Palmerston North, New Zealand.





From [e-mail] Fri Oct 13 21:07:13 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!lamarck.sura.net!isdnlin.mtsu.edu!atlas.tntech.edu!news!jra1854
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Anybody used Ramsey FX-440 for 9600?
Message-ID: <[e-mail]>
From: [e-mail] (Jeffrey Austen)
Date: Fri, 13 Oct 95 12:20:03 GMT
References: <4332ef$[e-mail]> <[e-mail]> <[e-mail]>
Organization: Tennessee Technological University (USA)
Nntp-Posting-Host: cookie-monster.ee.tntech.edu
X-Newsreader: VersaTerm Link v1.1.3
Lines: 35
Xref: news.epix.net rec.radio.amateur.digital.misc:12232 rec.radio.amateur.homebrew:11085

In Article <[e-mail]>, [e-mail] (James D. Cronin) wrote:
>
>Does the Ramsey FX-440 transceiver kit actually work for 9600 baud packet?
>I have friend-of-a-friend word that Ramsey claims it works on 9600 baud
>packet, but nobody has actually been able to get it going quite right.

Some time ago I bought their kit.  I found that the receiver suffered from
many spurious responses which, given right (wrong?) packet frequency would
make it pretty useless.  I did get it to receive 9600 but had a pretty
strong signal to work with and didn't make any performance measurements so
I can't really comment on the receive performance.  The transmitter was a
disaster!  Because they have no shielding anywhere in the radio the
transmitter output got back into the PLL and the resultant signal resembled
broadband noise.  I wasted a lot of time trying to clean that up and never
was successful.  I believe that  taking the time to build a good shield
around the PLL would have solved the problem but there are problems with
the board layout that make it a  difficult thing to do.  I did find a few
minor design errors which resulted a very long (for 9600 packet) TR
turnaround time.  They directly modulate the VCO, like most radios, so the
transmitter will distort the signal.  I never got far enough to worry about
that.

A friend of mine bought one and had similar problems.  Both of us wasted a
good bit of money.  Since then we have discovered the joys of converting
commercial (e.g., Motorola and GE) radios...they work!

My recommendation is to avoid the unit unless they have made major design
changes since the original radio (the 2-m version failed the transmitter
spurious output test -- see the QST review from about a year ago).

Jeff, k9ja
---
Jeffrey Austen       |  Tennessee Technological University
[e-mail]   |  Box 5004
[phone]      |  Cookeville Tennessee 38505   U.S.A.


From [e-mail] Fri Oct 13 21:07:14 1995
Path: news.epix.net!news.sprintlink.net!psgrain!news.uoregon.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!chi-news.cic.net!simtel!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan
From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ciruit Board Specialists
Date: 12 Oct 1995 17:03:44 GMT
Organization: The Greater Detroit Free-Net
Lines: 13
Message-ID: <45jhpg$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


I'm not fure if this is the same vender, but I have catalogs from
Circuit Specialist, Inc.:

CIRCUIT SPECIALIST, INC.
P.O.Box 3047
Scottsdale, AZ 85271-3047

1-800-528-1417

Roland Burgan, KB8XI
Hancock, MI
--


From [e-mail] Fri Oct 13 21:07:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cooling A 3-1000 Tube
Date: 13 Oct 1995 05:56:22 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 32
Sender: [e-mail]
Message-ID: <45ld46$[e-mail]>
References: <45h3tg$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <45h3tg$[e-mail]>, [e-mail] (Doug
Snowden) writes:

>Has anyone seen successful application of muffin fans as a cooling
>source for the 3-1000 ? I realize that one might need a larger size
>fan. Since the 3-500Z tube likes this method and the 3-1000 is just
>a bigger version I thought the same methods would work - that is
>raising the socket slightly to cool the pins, etc. Blowers take a
>lot of room...
>
>Doug N4IJ [e-mail]
>
>

If you use this tube be aware that the self neutralizing frequency is very
low, so you need very short grounds from the grid pins to the chassis and
a very short anode to chassis connection through the plate tuning cap. So
elevating the socket may mess up the performance!

A 3-1000A also usually requires a special parallel resonant parasitic
choke to stabilize the amp without excessive loss on ten meters or 15
meters.

You can cool the tube with big muffin fans, the back pressure is low. But
be sure you use temperature sensitive paint or crayons to check the seal
temps if you homebrew a non-standard cooling system. Remember that tube is
exactly like a 1000 watt electric heater, and it takes a good volume of
properly directed air to keep it cool. Muffin fans "puffing across the
tube" will be noisier than a blower or pressurized airflow system for the
same amount of cooling.

73 Tom


From [e-mail] Fri Oct 13 21:07:17 1995
Path: news.epix.net!news.sprintlink.net!news.onramp.net!convex!cs.utexas.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!mgarrett
From: [e-mail] (Mark A. Garrett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Crystals in cordless phone
Date: 12 Oct 1995 00:11:09 GMT
Organization: University of Illinois at Urbana
Lines: 50
Message-ID: <45hmet$[e-mail]>
References: <calhoun-0410951929480001@205.162.195.21> <AC8A1B3D9668175ED1@205.162.195.2> <44fcd5$[e-mail]>
Reply-To: [e-mail] (Mark A. Garrett)
NNTP-Posting-Host: firefly.prairienet.org


In a previous article, [e-mail] (Dave Calhoun) says:

>How do you retune a pilot tone? Thanks for the reply,
>dave

Dave:
First of all, make sure that everything else is working on the phone before
you try this.  Confirm that the phone is transmitting on both the base
and handset.  This can be done most easily with the help of a programmable
scanner.
Second, confirm that the recievers are working on both the base and handset.
Best thing to do there is to use a scope and go in on the IF/ decoder IC
and probe around for white noise on the hand held portion while the base
has no power applied to it and the base when the hand held is shut off.
Then, turn on the unit when you find it and see if you see the white noise
quiet down and possible look for audio when either the handset is talked
into on the base or on the handset when the page or intercom button is
pressed.  If you dont have a page or intercom on the base unit, then look
for quieting on the handset and leave it at that.
If you have all of this and your phone does not work, then and only then you
may need to adjust the pilot tone.  If you adjust anything in a phone be
sure to note the position on the pots inside either the base or handset.
Go thru the phone and determine what does what.  For examble in the handset
there will be a pot for deviation and earphone volume as well in some phones
for compression.  If you have one of the secure phones then there may be
more adjustments (I have yet to run into one of these).  Once you feel that
you have found the adjustment pot for the pilot, say in the handest, note
where it is and adjust with the base unit powered up and connected to the
phone line, antenna fully collapsed on the handset and base and at least
10 feet away from the base but not more than 50 feet.  Adjust slowly and see
if you can bring up a dialtone.  If you cannot, reset the pot back where it
was and move on.
Now Dave I am assuming that you know a little bit about transmitters and
recievers and that you know a pot from a coil.  If you have a schematic
great but you probably don't.  This takes a lot of thought in understanding
some of the workings of the cordless phone and where some of the controls
are in one of these units.
I have mostly experimented with cordless phones including a whole boxfull
that I recently picked up at a hamfest.  I do not fix cordless phones for
a living and just find them interesting devices so I am not a expert.
If you wish to write me direct, feel free to do so.  I posted this so that
others might be interested and post a reply on this.  I might have missed
something (very possible) or have a hint that may aid you in repair.
Good luck Dave
>

--
Mark Garrett   [e-mail]
               KA9SZX @ N9LNQ.#ECIL.IL.USA.NOAM


From [e-mail] Fri Oct 13 21:07:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: easy keyer circuit needed
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Tue, 10 Oct 1995 14:01:03 GMT
Lines: 19

In article <[e-mail]> BRETSKI <[e-mail]> writes:
>
>Surely there is an easy circuit I can build
>to key 700 Hz tones to a speaker.
>I want soemthing real simple to practice sending code.

A 555 timer chip running in astable mode will get you the tone,
though it may be a touch raspy. Or you could wire up a Twin-Tee
transistor audio oscillator if you are a purist. Circuits in
the Handbook. But if you aren't so picky about the tone frequency,
then just go to Rat Shack and get a piezo buzzer. Key the B+ and
instant code practice oscillator.

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 Oct 13 21:07:19 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!tank.news.pipex.net!pipex!oleane!simtel!news.kei.com!world!indra.com!rainman
From: [e-mail] (David G Cole)
Subject: FM Transmitter Schematic Wanted
Message-ID: <[e-mail]>
Organization: Indra's Net - Public Internet Access
Date: Wed, 11 Oct 1995 22:14:15 GMT
X-Newsreader: TIN [version 1.2 PL2]
Lines: 9

I'm looking for a schematic to build a legal, low-power, FM broadcast band
(88-108 MHZ) transmitter. The transmitter should be capable of high-quality
audio, approaching 20Hz -20Khz with low distortion, and preferably stereo.
While I'm on the subject, can someone enlighten me about what is and is not
legal to transmit in the FM band in the U.S.?

        David Cole

        [e-mail]


From [e-mail] Fri Oct 13 21:07:20 1995
Path: news.epix.net!news.sprintlink.net!news.icon.net!okc141.icon.net!ssampson
From: [e-mail] (Steve Sampson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM Transmitter Schematic Wanted
Date: Wed, 11 Oct 1995 22:36:32
Organization: (ICON) InterConnect Online, Inc.
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: okc141.icon.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <[e-mail]> [e-mail] (David G Cole) writes:

>I'm looking for a schematic to build a legal, low-power, FM broadcast band
>(88-108 MHZ) transmitter. The transmitter should be capable of high-quality
>audio, approaching 20Hz -20Khz with low distortion, and preferably stereo.
>While I'm on the subject, can someone enlighten me about what is and is not
>legal to transmit in the FM band in the U.S.?

Most of the chip Stereo transmitters don't have good audio quality.  You
should be able to transmit anything you like.  You can even transmit stereo
in the ham bands if you want.  The city library should be visited to learn all
the regulations under Part 15.  It mostly regulates power, not content. You
can't cause interference of course.  If you decide to broadcast phone sex,
then that probably wouldn't be allowed.  There are limits to everything.

I don't know of any schematics, but you probably want to start with the RF
section and work back.  You need a very linear, high bandwidth capable
transistor.  Otherwise all that quality audio before it goes right into the
dumpster.

Anyone know of a good choice?



From [e-mail] Fri Oct 13 21:07:21 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!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: FM Transmitter Schematic Wanted
Date: 13 Oct 1995 00:44:22 GMT
Organization: Stanford Amateur Radio Club
Lines: 39
Message-ID: <45kcp6$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <[e-mail]> [e-mail] (Steve Sampson) writes:
>In article <[e-mail]> [e-mail] (David G Cole) writes:
>
>>I'm looking for a schematic to build a legal, low-power, FM broadcast band
>>(88-108 MHZ) transmitter. The transmitter should be capable of high-quality
>>audio, approaching 20Hz -20Khz with low distortion, and preferably stereo.
>>While I'm on the subject, can someone enlighten me about what is and is not
>>legal to transmit in the FM band in the U.S.?
>
>Most of the chip Stereo transmitters don't have good audio quality.  You
>should be able to transmit anything you like.  You can even transmit stereo
>in the ham bands if you want.  The city library should be visited to learn all
>the regulations under Part 15.  It mostly regulates power, not content. You
>can't cause interference of course.  If you decide to broadcast phone sex,
>then that probably wouldn't be allowed.  There are limits to everything.
>
>I don't know of any schematics, but you probably want to start with the RF
>section and work back.  You need a very linear, high bandwidth capable
>transistor.  Otherwise all that quality audio before it goes right into the
>dumpster.
>
>Anyone know of a good choice?
>

The Ramsey Kit Model FM10A does what you need. The price is about $35.
for the board and parts.

I am not sure what the comments about linearity are all about. We are
talking about an FM transmitter here - unless you are talking about
voltage vs. frequency linearity of the FM modulator.  Amplitude linearity
is not a factor for the oscillator transistor.

Steve Muther

WF6R

[e-mail]




From [e-mail] Fri Oct 13 21:07:22 1995
Path: news.epix.net!news.sprintlink.net!news.icon.net!okc108.icon.net!ssampson
From: [e-mail] (Steve Sampson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FM Transmitter Schematic Wanted
Date: Thu, 12 Oct 1995 21:40:23
Organization: (ICON) InterConnect Online, Inc.
Lines: 37
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <45kcp6$[e-mail]>
NNTP-Posting-Host: okc108.icon.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <45kcp6$[e-mail]> [e-mail] (Steve Muther) writes:
>In article <[e-mail]> [e-mail] (Steve Sampson)
writes:
>>In article <[e-mail]> [e-mail] (David G
Cole) writes:>>
>>>I'm looking for a schematic to build a legal, low-power, FM broadcast band
>>>(88-108 MHZ) transmitter. The transmitter should be capable of high-quality
>>>audio, approaching 20Hz -20Khz with low distortion, and preferably stereo.
>>>While I'm on the subject, can someone enlighten me about what is and is not
>>>legal to transmit in the FM band in the U.S.?
>>
>>Most of the chip Stereo transmitters don't have good audio quality.  You
>>should be able to transmit anything you like.  You can even transmit stereo
>>in the ham bands if you want.  The city library should be visited to learn all
>>the regulations under Part 15.  It mostly regulates power, not content. You
>>can't cause interference of course.  If you decide to broadcast phone sex,
>>then that probably wouldn't be allowed.  There are limits to everything.
>>
>>I don't know of any schematics, but you probably want to start with the RF
>>section and work back.  You need a very linear, high bandwidth capable
>>transistor.  Otherwise all that quality audio before it goes right into the
>>dumpster.
>>
>>Anyone know of a good choice?
>>

>The Ramsey Kit Model FM10A does what you need. The price is about $35.
>for the board and parts.

>I am not sure what the comments about linearity are all about. We are
>talking about an FM transmitter here - unless you are talking about
>voltage vs. frequency linearity of the FM modulator.  Amplitude linearity
>is not a factor for the oscillator transistor.

I was thinking about the modulator.  The linearity of the deviation.  Instead
of folding at the edges like the Ramsey kit does.



From [e-mail] Fri Oct 13 21:07:23 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!newsmaster
From: <100271.1747.,@compuserve.com>
Newsgroups: rec.radio.amateur.homebrew
Subject: H.R.T
Date: 10 Oct 1995 21:01:42 GMT
Organization: CompuServe Incorporated
Lines: 5
Message-ID: <45emvm$[e-mail]>
NNTP-Posting-Host: ad36-130.compuserve.com
Content-Type: text/plain
Content-length: 101
X-Newsreader: AIR Mosaic (16-bit) version 1.00.198.07


Is the on-line version produced by yourselves?
WIll take a look.
regards, Mike G4GER (subscriber)



From [e-mail] Fri Oct 13 21:07:25 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!news.pubnix.net!mba!juxta!michael.black
From: [e-mail] (Michael Black)
Date: 13 Oct 95 11:21:04
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help w/ Power Supply
Message-ID: <[e-mail]>
Organization: MtlNet (MBA.org) Juxtaposition BBS. [phone]
Lines: 38

[e-mail] (Todd Goins) is trying to fix
a commercial power supply that uses a 723 voltage
regulator and a bunch of pass transistors.

jgoecks <[e-mail]> responded with some help
but added that "it sounds like a linear regulator that
uses a 3 terminal regulator to control pass transistors".

I just want to point out that the 723 IS NOT a 3-terminal
regulator.  The 723 is actually a much more complicated
voltage regulator IC.  It comes in a TO-5 package with10
pins, or a 14pin DIP.  I seem to recall that it predates
3-terminal regulators.  It is a quite common IC; probably
made by many different manufacturers.  I know National made
it, and I would assume they still do.  By itself, it can
supply only 150mA of output current.  It was intended for use
with an external pass transistor.  Probably in the very early
days it saw use as a low current regulator without pass transistor,
but ever since 3-terminal regulators hit the scene there's no
sense using the 723 for low current applications since it
requires external parts.  On the other hand, since you can
do things with those external components to change it's operation
(there's little that you can do to a 3-terminal regulator), the
723 can be used for quite a few different things.

It is worth having the data sheet for the 723, since you may
come across it in circuits.  Certainly if you are servicing a supply
that has one, it's worth getting the data sheet.  If you don't have
a schematic, it's a whole lot easier to figure out the circuit by
comparing the circuit on the board with the "standards" in the data
sheet than to trace out the circuit on the board and then try to
figure out how it works.

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



From [e-mail] Fri Oct 13 21:07:26 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!news.uoregon.edu!psgrain!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!howland.reston.ans.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (Bill Sorsby)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help!  Odd size British coil tuning cores needed
Date: 12 Oct 1995 13:20:26 GMT
Organization: TI
Lines: 12
Message-ID: <45j4mq$[e-mail]>
NNTP-Posting-Host: wsorsby.dseg.ti.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

I need a dozen or so powdered iron coil core slugs the diameter of which
is just slightly smaller than the common .25" O.D.  They are used in a
late '60 British made radio, so I assume the slugs are metric sizes of 6
mm or possibly 5 mm diameter.  I need various lengths also.

If you know where I might get some please contact me via e-mail at
[e-mail]


Regards,
Bill, N5BU



From [e-mail] Fri Oct 13 21:07:26 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!cs.utexas.edu!uunet!in1.uu.net!nntpgate.primenet.com!nntpdist.primenet.com!lager
From: [e-mail] (Woody Harper)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help! Need Silver Plated SO-239
Date: 12 Oct 1995 16:00:41 GMT
Organization: Primenet [phone]
Lines: 9
Message-ID: <45je39$[e-mail]>
NNTP-Posting-Host: usr1.primenet.com
NNTP-Posting-User: lager
X-Newsreader: TIN [version 1.2 PL2]

I want to build the 800MHz antenna profiled in the November, 1995 Popular
Electronics but cannot find a source for SILVER plated panel mount SO-239
connectors. I have nickel plated ones available but the plans call for
silve plated components. I need a source. Help!!!

--
-------------------------------------------------------------------------------
Home Page: http://www.primenet.com/~lager



From [e-mail] Fri Oct 13 21:07:27 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!tank.news.pipex.net!pipex!newsfeed.internetmci.com!chi-news.cic.net!simtel!news.kei.com!newshost.marcam.com!uunet!in1.uu.net!vivanews.vivanet.com!mulveyr
From: [e-mail] (Rich Mulvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: 11 Oct 1995 11:36:57 GMT
Organization: Mulvey Home Node
Lines: 15
Message-ID: <45ga8p$[e-mail]>
References: <45aql3$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip150.vivanet.com
X-Newsreader: TIN [version 1.2 PL2]

Lord Wisp ([e-mail]) wrote:
: I am trying to built a linear for my 10 meter radio but cannot find any
: schematics... Can anyone help me or email me with schematics and parts
: lists..
: and where to get them,,, Thanks!!!

   Was that 10M or 11M you were interested in?

:-)

---
Rich Mulvey, N2VDS                                        Rochester, NY   USA
[e-mail]
[e-mail]
n2vds@wb2psi.#wny.ny.us


From [e-mail] Fri Oct 13 21:07:28 1995
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!news.tek.com!gazette!not-for-mail
From: [e-mail] (Ed Burress)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: 10 Oct 1995 15:33:27 -0700
Organization: Tektronix, Inc., Wilsonville,  OR.
Lines: 16
Message-ID: <[e-mail]>
References: <45aql3$[e-mail]>
NNTP-Posting-Host: sepia.wv.tek.com

In article <45aql3$[e-mail]> [e-mail] (Lord Wisp) writes:
>I am trying to built a linear for my 10 meter radio but cannot find any
>schematics... Can anyone help me or email me with schematics and parts
>lists..
>and where to get them,,, Thanks!!!
>

Gee, no real name posted, no call sign, and aol account (not that that
means anything) and for 10 meter (or was that 11 meter?)
No thanks...
I like helping folks when I can, I just kind of like to know who the
other person is before I do....

Ed Burress
KC7GFX



From [e-mail] Fri Oct 13 21:07:29 1995
Path: news.epix.net!news.sprintlink.net!gatech!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!oleane!simtel!zombie.ncsc.mil!news.duke.edu!godot.cc.duq.edu!newsfeed.pitt.edu!uunet!in2.uu.net!csn!nntp-xfer-2.csn.net!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: 11 Oct 1995 23:12:48 GMT
Organization: University of Colorado, Boulder
Lines: 25
Message-ID: <45hj1g$[e-mail]>
References: <45aql3$[e-mail]> <45glna$[e-mail]>
NNTP-Posting-Host: spot.colorado.edu

In article <45glna$[e-mail]>,
DAVID J. DICENSO <[e-mail]> wrote:
>[e-mail] (Lord Wisp) wrote:
>
>>I am trying to built a linear for my 10 meter radio but cannot find any
>>schematics... Can anyone help me or email me with schematics and parts
>>lists..
>>and where to get them,,, Thanks!!!
>
>No!  Don't E-Mail!!! Post for other inquiring hams who want to know!!!
>(I've got an old homebrew 10m tube-type exciter that I'd like to beef
>up, and a converted CB (now 10m) radio that needs oompf, too!)
>
>Post 'em for the rest of us!
>
>Thanks.
>73,
>Dave    WB1CDG / 7J6CCH
>

Say, what's your callsign, Mr. Wisp?  Inquiring minds want to know
that too.

Bruce Tiemann
N6URH


From [e-mail] Fri Oct 13 21:07:30 1995
Path: news.epix.net!news.sprintlink.net!news.icon.net!okc104.icon.net!ssampson
From: [e-mail] (Steve Sampson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: Wed, 11 Oct 1995 20:49:24
Organization: (ICON) InterConnect Online, Inc.
Lines: 23
Message-ID: <[e-mail]>
References: <45aql3$[e-mail]> <45ga8p$[e-mail]>
NNTP-Posting-Host: okc104.icon.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <45ga8p$[e-mail]> [e-mail] (Rich Mulvey) writes:
>From: [e-mail] (Rich Mulvey)
>Subject: Re: HELP!!!!
>Date: 11 Oct 1995 11:36:57 GMT

>Lord Wisp ([e-mail]) wrote:
>: I am trying to built a linear for my 10 meter radio but cannot find any
>: schematics... Can anyone help me or email me with schematics and parts
>: lists..
>: and where to get them,,, Thanks!!!

>   Was that 10M or 11M you were interested in?

>:-)

There's a nice solid state amplifier in the 1986 ARRL Handbook.  I have a
Truckers AMP that is almost identical, and used it to get my 10m rig into
the 100 watt range.  Should be easy to duplicate.

But if you're interested I have a nice tube amp that will fit the bill, I think
it's a 100 watts out for 4 watts in.  Now that I have a real HF rig, I don't
need this converter stuff :-)



From [e-mail] Fri Oct 13 21:07:31 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!simtel!zombie.ncsc.mil!blackbird.afit.af.mil!news.usafa.af.mil!usenet
From: [e-mail] (DAVID J. DICENSO)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: Wed, 11 Oct 1995 14:49:41 GMT
Organization: United States Air Force Academy
Lines: 17
Message-ID: <45glna$[e-mail]>
References: <45aql3$[e-mail]>
NNTP-Posting-Host: dfl52.usafa.af.mil
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Lord Wisp) wrote:

>I am trying to built a linear for my 10 meter radio but cannot find any
>schematics... Can anyone help me or email me with schematics and parts
>lists..
>and where to get them,,, Thanks!!!

No!  Don't E-Mail!!! Post for other inquiring hams who want to know!!!
(I've got an old homebrew 10m tube-type exciter that I'd like to beef
up, and a converted CB (now 10m) radio that needs oompf, too!)

Post 'em for the rest of us!

Thanks.
73,
Dave    WB1CDG / 7J6CCH



From [e-mail] Fri Oct 13 21:07:32 1995
Path: news.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: 12 Oct 1995 15:55:53 GMT
Organization: UniSQL, Inc.
Lines: 23
Message-ID: <45jdq9$[e-mail]>
References: 45aql3$[e-mail]> <[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

Ham Radio published a short article on using the 4CX250-series
tubes withOUT forced air cooling.  Used a loctal socket
instead of a Eimac mondo-dollar socket.  Sep. 76??  I don't have
the reference handy, but I have a photocopy of the article.

Seems this tube works nicely to about 80 watts plate dissipation without
requiring any forced air cooling, just plenty of room for convection.
I don't recall if this was grounded-grid, but it wanted to see about
5 watts input for about 100 watts out on SSB.  They tested on 20m,
but a 10m network for this tube is trivial.

Power supply was from an old TV set transformer and gave about 800 V Ep
and provided filament for the final as well.  Pi network output,
untuned input.  It was so simple I don't know why it never made
the Handbook -- oh, wait, maybe I just figured it out.

The best part of this amp was that if you used the right socket and chimney
you could provide forced-air cooling, and QRO by simply providing a
hotter plate supply.

Jim N6OTQ




From [e-mail] Fri Oct 13 21:07:33 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: 13 Oct 1995 05:56:03 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <45ld3j$[e-mail]>
References: <45hj1g$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <45hj1g$[e-mail]>, [e-mail]
(TIEMANN BRUCE) writes:

>>>I am trying to built a linear for my 10 meter radio but cannot find any
>>>schematics... Can anyone help me or email me with schematics and parts
>>>lists..
>>>and where to get them,,, Thanks!!!
>>

Try Palomar Engineering,  D+A Raider, or Black Cat. They all make "HAM"
amplifiers like the one you're looking for.

73 Tom


From [e-mail] Fri Oct 13 21:07:33 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of AM car radio
Date: 10 Oct 1995 14:54:51 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 15
Sender: [e-mail]
Message-ID: <45efhr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail]
(Muenzler, Kevin) writes:

>
>Generally the impedance of an AM/FM car radio is about 75 ohms.
>Impedance of the "old" AM only radios (transistor) was also about 75
>ohms.  The really old (tube) AM radios had an impedance of between
>75 and about 95 ohms.
>
>Kevin, WB5RUE

What is the source of your data Kevin? That's contrary to everything I've
ever heard.

73 Tom


From [e-mail] Fri Oct 13 21:07:35 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Impedance of AM car radio
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <456mtm$[e-mail]> <457751$[e-mail]> <4577re$[e-mail]>
Date: Mon, 9 Oct 1995 16:00:08 GMT
Lines: 17
Sender: [e-mail]

in <4577re$[e-mail]>, John R. Cunliffe wrote:
: [e-mail] (W8JI  Tom) wrote:
: >In article <456mtm$[e-mail]>, [e-mail]
: >>Anyone know impedance of AM car radio antenna input ?, is it 50 ohms ?.
: >>I am designing a convertor and can not find info I need .
: >No it's sure not 50 ohms, it's usually very high Z. The antenna it matches
: >is a short unloaded voltage probe, so the input of the rx has to be very
: >high Z to not load it.
: The cable used on car antennas is 125 ohm's or 93 ohm's dependend what
: manufacturer used.

But car radios used to have a trimmer cap to adjust the capacitance of
the whole assembly.  Not something you'd need if it were a transmission
line.

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



From [e-mail] Fri Oct 13 21:07:36 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of AM car radio
Date: 13 Oct 1995 05:55:46 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 30
Sender: [e-mail]
Message-ID: <45ld32$[e-mail]>
References: <45h55u$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <45h55u$[e-mail]>, [e-mail] (Jeff
DePolo) writes:

>
>I've seen 50 ohm, 75 ohm, 93 ohm, and other cable impedances on car
>broadcast antennas.  I'm not sure there is a standard.  Like Mark
>said, it really doesn't matter.  It's just assumed to be very high-Z
>for AM.  Consider the length of the coax compared the wavelength of
>broadcast band AM and you'll see that the type of coax is really
>meaningless as is the short antenna.  Just assume very high Z at
>the input terminals.
>
>
>
>--
I'll disagree with a little bit of that. The capacitance per foot of the
feedline MUST be low, because the antenna is so short. So the feedline
length isn't as important as the total feedline capacitance, since it
shunts the antenna. That's why in the days when AM reception was
paramount, the feeder had a single teeny tiny hair like conductor in a
mostly air insulated cable.

An earlier statement that said "adding a few feet of regular 50 or 75 ohm
cable will kill AM sensitivity" is very true. It becomes a capacitance
voltage division problem. The input of a standard WELL DESIGNED car radio
is a very high impedance, and the feedline of a WELL DESIGNED AM system is
very low capacitance cable, because the AM antenna is a very high source
impedance voltage probe.

73 Tom


From [e-mail] Fri Oct 13 21:07:37 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!cs.utexas.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Impedance of AM car radio
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <456mtm$[e-mail]> <457751$[e-mail]> <4577re$[e-mail]> <[e-mail]> <45h55u$[e-mail]>
Date: Fri, 13 Oct 1995 11:12:40 GMT
Lines: 18
Sender: [e-mail]

Jeff DePolo ([e-mail]) wrote:
: Consider the length of the coax compared with the wavelength of
: broadcast band AM and you'll see that the type of coax is really
: meaningless as is the short antenna.

Good point. In one of National Semiconductor's data books (linear data
book? ) there is a very good technical analysis of auto radio AM
broadcast band antennas complete with math. One interesting point they
made was that the auto radio antenna is far more efficient than the
ferrite rods typical of portables and table radios. But then again, you
can peak or null signals with a ferrite rod. So the table radio
probably has potential for better signal/noise ratio but in the absence
of interference the whip is a better choice for weak signal reception.
Hard core AM DXers often use a combination of open loop and whip "sense"
antenna. The combination can be tuned for a cardioid type pattern.

Thomas
KI4N


From [e-mail] Fri Oct 13 21:07:38 1995
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!woodhill.demon.co.uk
From: [e-mail] (Bob Carter)
Newsgroups: rec.radio.amateur.homebrew
Subject: jota !help!!!! - jott.txt (1/1)
Date: Tue, 10 Oct 1995 17:01:34 GMT
Organization: Woodhill Creativity
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: woodhill.demon.co.uk
X-NNTP-Posting-Host: woodhill.demon.co.uk
X-Newsreader: Forte Free Agent 1.0.82

begin 644 jott.txt
M#0H-"@T*"4-A;B!A;GEO;F4@<&QE87-E(&AE;'`@;64_#0H-"@E/;B!T:&4@
M=V5E:V5N9"!O9B!/8W1O8F5R(#(Q<W0@=&AE(%-C;W5T(&UO=F5M96YT(&ES
M(&EN=F]L=F5D(`EI;B!T:&4@2F%M8F]R964@3VX@5&AE($%I<B`H2D]402DN
M(%=E(&%T('1H92!0:&]E;FEX(%9E;G1U<F4)"55N:70@*$ME;G1O;B`F($MI
M;F=S8G5R>2!$:7-T<FEC="D@:&%D(&%R<F%N9V5D(&9O<B!A(&QI8V5N8V5D
M(`ER861I;R!O<&5R871E<B!A;B!A(&9E=R!O9B!H:7,@8V]L;&5G=65S('1O
M('5S92!O=7(@56YI="!$96X@87,@"6$@8F%S92!F;W(@82!R861I;R!S=&%T
M:6]N+B!792!H879E(&UA9&4@86QL('1H92!A<G)A;F=E;65N=',@"69O<B!M
M87-T<R!A;F0@=VER97,@=&\@8F4@<W1R=6YG(&9O<B!A97)I86QS('1E;&5P
M:&]N92!L:6YE<R`)971C+B!B=70@:&4@:&%S(&IU<W0@8F5E;B!G:79E;B!T
M:&4@8V]M<&QE=&EO;B!D871E(&9O<B!M;W9I;F<@"6AO=7-E(&%N9"!I="!I
M<R!T:&%T('=E96ME;F0L('1H97)E9F]R92!W92!A<F4@=VET:&]U="!A(`EL
M:6-E;F-E9"!O<&5R871O<BX@27,@=&AE<F4@86YY8F]D>2!O<B!A(')A9&EO
M(&=R;W5P('1H870@=V]U;&0@"6QI:V4@82!C:&%N9V4@;V8@=F5N=64@=VET
M:"!O<'!O<G1U;FET:65S(&9O<B!N97<@8V]N=&%C=',@=&AA="`)=V]U;&0@
M8F4@=VEL;&EN9R!T;R!H96QP('5S(&]U="P@=&EM92!I<R!O9B!T:&4@97-S
M96YC92!W:71H(`ER96=A<F0@=&\@87)R86YG96UE;G1S(&%N9"!L:6-E;F-E
M<R!E=&,N($EF('EO=2!C86X@:&5L<"!O<B`)<F5Q=6ER92!A;GD@9G5R=&AE
M<B!D971A:6QS('!L96%S92!R97!L>2!A<V%P+@T*"0T*"4)O8F-`=V]O9&AI
M;&PN9&5M;VXN8V\N=6L-"@E";V)C0')O=F5R9&5N+F1E;6]N+F-O+G5K#0H)
>4F]B97)T+D-A<G1E<D!D;W,N=7,M<W1A=&4N9V]V
`
end


From [e-mail] Fri Oct 13 21:07:39 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: Minicircuit VCO's   ???
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Mon, 09 Oct 95 22:01:26 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 23



Wondering if anyone has any experience with the new line of
Minicircuits (MCL) VCO's ?

I understand that they come in a variety of ranges.
What is the supply voltage requirement ?  What type of package ?
What are the pinout definitions ?
Do they have one in the range of 23 to 26 MHz ?
How much are they and can they be bought in single qty ?

Thanks..Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]

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



From [e-mail] Fri Oct 13 21:07:40 1995
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!qns3.qns.com!news.ecn.uoknor.edu!munnari.oz.au!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Mark Aitken)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Mods to HR2600!!!
Date: 10 Oct 95 14:10:44 GMT
Organization: ucsd usenet gateway
Lines: 41
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]



While reading Ham-Homebrew I noticed........

>==========DAVID J. DICENSO, 9/29/95==========
>
>
>Anybody got a mod for the HR2600 that'll let me reduce power
>below the
>accepted QRP 5 watt level?
>
>I wrote Uniden, but got a rather impolite nasty-gram that implied
>serious repercussions if I were to modify my radio in any way...
>
>Same punishment as tearing that little tag of your matterss, I
>guess.
>
>Thanks for any suggestions!
>
>- Dave WB1CDG / 7J6CCH
>
>

Tell 'em to shove it!  You own the thing and experimentation is what Ham
Radio is all about.  I had a HR2510 and I remember nothing about a warning
about repercussions if working/modifying on the radio,  apart of course
about out of band transmission!

73

Mark


                Mark Aitken Amateur Radio Operator VK3JMA
                -----------------------------------------
                AX25net : VK3JMA @ VK3BLW.#MEL.VIC.AUS.OC
                AX25ip  : vk3jma@44.136.73.96
                Fidonet : Mark Aitken @ 3:635/502
                Internet: [e-mail]
                -----------------------------------------



From [e-mail] Fri Oct 13 21:07:42 1995
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From: BRETSKI <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: More antenna fun.
Date: Wed, 11 Oct 1995 09:45:23 -0500
Organization: Purdue University
Lines: 33
Message-ID: <[e-mail]>
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Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Xref: news.epix.net rec.radio.amateur.equipment:20353 rec.radio.amateur.homebrew:11055 rec.radio.amateur.antenna:16421


This time it was the 2 meter portable groundplane on page 20.59
of the ARRL Handbook for 1995. I sure do like this book.
The lesson I learned from this experience was to listen to
my elders or is that Elmers. :-)

He says to make sure to use a soldering iron that will go at least
700+ degrees F.

That's what he means.

My 100 watter crapped out last night so I tried to use my puny
pencil iron. Even after leaving it on the wire and solder for a long
time it still wasn't hot enough.

I even used a candle flame to heat the copper but the solder would
not melt. :-(

So I brought the thing in this AM to work and used our iron which
goes to 850+ F. That did a GREAT job. It all flowed together
nicely.

If we learn from our mistakes, then I am a genius.

See ya.
73 de N9ZFF


BRET A. PENNINGTON /  COMPUTER TECHNICIAN   /EARTH AND ATMOSPHERIC SCIENCES
CIVL 4252 317-494-0678 / PURDUE UNIVERSITY  / WEST LAFAYETTE, INDIANA 47907
[e-mail]                   /     speaking only for myself.
/\/\/\/\/\/ __... /\/\/\/\/\/\/\/\ N9ZFF /\/\/\/\/\/ ...__ /\/\/\/\/\/\/\/\



From [e-mail] Fri Oct 13 21:07:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!usenet
From: [e-mail]    (Robert L. Spooner, AD3K)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola Engineering Brief Help Needed!!
Date: 13 Oct 1995 21:16:46 GMT
Organization: Applied Research Laboratory, The Pennsylvania State Universitiy
Lines: 35
Message-ID: <45mkvu$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sor.arl.psu.edu
X-Newsreader: IBM NewsReader/2 v1.2

In <[e-mail]>, jason goldring <[e-mail]> writes:
>I recently aquired Motorola Engineering Brief number 63, which
>is a 140 watt 2-30 Mhz Broadband RF Amplifier, which is built
>around the MRF454's.
>
>After waiting patiently to get a hold of an engineer at Motorola
>regarding the substitution of RF devices in this circuit, I
>was told that the MRF455 could be substituted for the MRF454.
>( The 454 is a hard part to get around here, but the 455 is
>readily available.)
>
>My problem is that when I connect power to the unit, the
>transistors get hot very quickly, and my meter shows a current
>draw of 11 amps. I have gone over my wiring several times,
>and I have tested every single part for defects, and everything
>is ok. There are no shorts to ground. According to the engineering
>brief, the unit is supposed to draw only 500 ma. max per
>transistor during idle periods, and I am wondering if something
>has to be changed on the circuit board to allow the 455's to
>run properly, rather than drawing tons of current like it does
>now. Does anyone have any ideas? I get a feeling it has
>something to do with the bias resistor, which is a 33 ohm 5 watt
>wirewound unit, which feeds directly to the base of both
>transistors. Maybe the value has to be changed??
>
>Any information would be greatly appreciated!!.
>
If you're using a wirewound bias resistor, I hope it is well isolated for RF from the
rest of the circuit, otherwise the inductance may be causing a parasitic oscillation,
which could explain the high current!

Robert L. Spooner             Applied Research Laboratory
[phone]                             PO Box 30
[e-mail]      State College, PA 16804-0030



From [e-mail] Fri Oct 13 21:07:44 1995
Path: news.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola Engineering Brief Help Needed!!
Date: 13 Oct 1995 21:42:00 GMT
Organization: UniSQL, Inc.
Lines: 26
Message-ID: <45mmf8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

Replace the 33 ohm bias resistor with a NON-INDUCTIVE unit (what the
other poster said).

I built one of these amps some years ago and used a 2-watt carbon resistor,
raised about 3/4 inch off the PCB.  It worked fine.

Although it probably wasn't necessary, I added a couple of slip-on round
aluminum heatsinks, w/ heatsink compound, on the body of the resistor.
They were loose enough to slip and slide, so I doubt they gave any added heat dissipation.

The resistor never discolored, so it was well within its power range.

This is the cheap way. I think Vishay now owns Carborundum, who makes
leaded non-inductive resistors.  You can also get planar thick-film
non-inductive resistors (they look like a TO-220 transistor with 2 leads)
but I don't have a source.  Both these are expensive.

In a pinch you could substitute a bunch of paralleled 1/2 W resistors.
Since you're building a CB lee-nyar amplifier, I'll leave the determination
of values to you.

good luck, you're on the right track.

Jim N6OTQ




From [e-mail] Fri Oct 13 21:07:45 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!howland.reston.ans.net!news.starnet.net!wupost!news1.inlink.com!usenet
From: ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Need 3.490 Mhz Xtal for a HQ-160 High band
Date: Thu, 12 Oct 1995 06:00:25 GMT
Organization: inlink
Lines: 5
Message-ID: <45i01c$[e-mail]>
NNTP-Posting-Host: slip20.inlink.com
X-Newsreader: Forte Free Agent v0.55

 I an tring to get the high band on my Hammruland HQ-160 and have
discovered the high band converter crystal is needs replacement. I
don't know if it is parallel  or not. The crystal frequency is
3,490,000 Hz. Please give me a call at 314-839-9396. Ask for Scott



From [e-mail] Fri Oct 13 21:07:46 1995
Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Sergei Kulyov)
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED manual TM-201A
Date: 12 Oct 1995 00:32:41 -0400
Organization: The Greater Columbus FreeNet
Lines: 7
Message-ID: <45i5p9$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
X-Newsreader: TIN [version 1.2 PL2]


Hi gang. I'm looking for the manual for the Kenwood TM-201A 2 m radio
and the MC-48  mic.


73! Sergei
Aa8OT,  UA3AP


From [e-mail] Fri Oct 13 21:07:47 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!pa.dec.com!nntpd.lkg.dec.com!netcad.enet.dec.com!wade
From: [e-mail] (Paul Wade)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: Need microwave/stripline design text
Date: 11 Oct 1995 13:19:11 GMT
Organization: Digital Equipment Corporation, LKG1-3/M07
Lines: 19
Distribution: world
Message-ID: <45gg8f$[e-mail]>
Reply-To: [e-mail] (Paul Wade)
NNTP-Posting-Host: kali.enet.dec.com


>Article 10686 of rec.radio.amateur.homebrew:
>From: [e-mail] (Bill VanRemmen)
>Subject: Need microwave/stripline design text

>I will be doing a project soon that will involve quite a bit of striplines.
>Specifically, this will include matching and impedance-transforming
>sections, interdigital and/or combline filters and 'discrete' inductances
>and capacitances.  All of the above will be etched on some suitable PC
>board material.

>Can someone point me to any articles or texts on designing these things?
>Emphasis on construction would be best, but if I have to slog through
>a DECENT EE text, that's ok too.

STRIPLINE CIRCUIT DESIGN by Harlan Howe, Jr. is the standard reference
on striplines.  Artech House, 1974, my office copy says third printing 1979.

paul N1BWT


From [e-mail] Fri Oct 13 21:07:48 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!news1.toronto.fonorola.net!news.compulink.com!abyss!lethe!gts!reptiles.org!westonia!humnet.humberc.on.ca!hduff
Subject: PLL/VCO homebrew designs
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Sat, 07 Oct 95 16:04:24 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 26




I'm in the process of designing a PLL/VCO to eliminate the need for
crystals on a bunch of lowband GE mobile rigs that my club aquired for
use on 6 meters.
I plan on using the serial MC145157 along with a PIC or 87C750 single
chip micro and a VCO made up of discrete parts.

I'd like to hear from some experienced designers of LPF/VCO circuits
for your suggestions/comments.

Thanks !

Hugh Duff  VA3TO  Toronto               [e-mail]


---
 ■ NFX v1.3 [000]

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



From [e-mail] Fri Oct 13 21:07:49 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 13 Oct 1995 20:02:13 GMT
Organization: Hewlett-Packard
Lines: 41
Message-ID: <45mgk5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
 <[e-mail]> wrote:
>
>
>
>I'm in the process of designing a PLL/VCO to eliminate the need for
>crystals on a bunch of lowband GE mobile rigs that my club aquired for
>use on 6 meters.
>I plan on using the serial MC145157 along with a PIC or 87C750 single
>chip micro and a VCO made up of discrete parts.
>
>I'd like to hear from some experienced designers of LPF/VCO circuits
>for your suggestions/comments.
>
>Thanks !
>
>Hugh Duff  VA3TO  Toronto               [e-mail]
>
>
>---
> ■ NFX v1.3 [000]
>
>--
>---------------------------------------------------------------------
>  HumberNet LSS (Learning Support System) - Humber College, Toronto
>     "Tomorrow's communication and learning environment, today"
>          Visit our Website at http://humnet.humberc.on.ca/
>

Trying to replace a multiplied-up crystal oscillator with a simple
minded synthesizer consisting of a '157 and VCO is asking for trouble
with spurious sidebands.  Unless you really need a lot frequency
agility, you would be far better off negotiating a group purchase
of crystals by the club.  This is one of those projects where anyone
who knows enough about the technology to know what is involved wouldn't
want to do it.  (BTW, if you "want to learn about synthesizers", pick
an easier neophyte project).

Rick Karlquist N6RK
[e-mail]



From [e-mail] Fri Oct 13 21:07:50 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!news.dfn.de!RRZ.Uni-Koeln.DE!wmwap1.math.uni-wuppertal.de!usenet
From: "Robert J. Schneider" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: QEX and QST?
Date: Fri, 13 Oct 1995 09:53:13 +0100
Organization: University of Wuppertal
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: wrds15.urz.uni-wuppertal.de
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b1 (X11; I; OSF1 V3.2 alpha)

Hi.
Did the September issue of QEX ond the October issue of QST
arrive somewhere?

Regards
Robert Schneider       DB1JJ
[e-mail]


From [e-mail] Fri Oct 13 21:07:51 1995
Path: news.epix.net!news.sprintlink.net!news.eznet.net!news.enterprise.net!btnet!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!news.uh.edu!BUDS1.baylor.edu!bilbo!rgm
From: [e-mail] (Ross G. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: SAN/BAR?
Date: 13 Oct 1995 02:17:11 GMT
Organization: Baylor University
Lines: 31
Message-ID: <45ki77$[e-mail]>
NNTP-Posting-Host: bilbo.baylor.edu
X-Newsreader: TIN [version 1.1 PL8]

Hey All,
  At a recent hamfest, I picked up (for 50 cents) what appeares to be a
 telephone keypad (0-9, * and # in the traditional arrangement) with some
 electronics on the back.  The primary components appear to be 2 banks of dip
 switches (7 switches each) some sort of round transformer type thing (about
 an inch in diameter and .5 inches thick) and a 40 pin dip chip with the label:

    SAN/BAR
 In warrenty until


 void if defaced.

 There is also a warning saying that "all constomer provided equipment used in
 conjuction with this SAN BAR equipment must be FCC Grandfathered or Registered"

  The guy I got it from thought that this was a fairly standard piece of
 telephone equipment.  Does anyone know what this does or what the switch
 settings do?  (I got it figuring I could probably find a use for a keypad, but
 I'm begining to think that this does something else.)

  Any info is appreciated.

 -Ross
  KB2RVB

BTW: There are just three wires coming off this keypad (grey, green and white).
  They're terminated with spade lugs, like they were meant to be connected to a
 screw terminal.




From [e-mail] Fri Oct 13 21:07:52 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!simtel!news.kei.com!newshost.marcam.com!uunet!in2.uu.net!nntpgate.primenet.com!nntpdist.primenet.com!lager
From: [e-mail] (Woody Harper)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Silver vs. Nickel: Why?
Date: 12 Oct 1995 17:40:46 GMT
Organization: Primenet [phone]
Lines: 15
Message-ID: <45jjuu$[e-mail]>
NNTP-Posting-Host: usr6.primenet.com
NNTP-Posting-User: lager
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.antenna:16463 rec.radio.amateur.homebrew:11078

Ok, here's a newbie question for today.

The November 1995 Popular Electronics has a pretty neat project I want to
build. The project is a 1/4 wave ground plane antenna. The main component
in the antenna is an SO-239 panel mount connector. The author of the
article claims that the connector must be silver plated as nickel plating
will not work. Why? I am having a devil of a time finding silver plated
SO-239 connectors in Phoenix, but can get nickel plated for $5.00 at
Radio Shack. The author does not explain why he feels that only silver
will work and I have no clue. Thanks in advance for any help.

--
-------------------------------------------------------------------------------
Home Page: http://www.primenet.com/~lager



From [e-mail] Fri Oct 13 21:07:53 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!cs.utexas.edu!uunet!in2.uu.net!nntpgate.primenet.com!nntpdist.primenet.com!primenet
From: [e-mail] (John S. Hill)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: Fri, 13 Oct 95 03:44:05 GMT
Organization: Department of Redundancy Dept.
Lines: 10
Message-ID: <45kn77$[e-mail]>
References: <45jjuu$[e-mail]>
NNTP-Posting-Host: ip170.msp.primenet.com
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.radio.amateur.antenna:16465 rec.radio.amateur.homebrew:11080

>The author of the article claims that the connector must be silver
>plated as nickel plating will not work. Why?

Good question. The silver version would be easier to solder to. I
would say, make sure the dialectric inside was Teflon as the connector
will probably get fairly hot during soldering and Teflon doesn't melt
too easy. Often but not always, you can only get Teflon dialectric
SO-239's if you buy the silver plated ones. 73, John




From [e-mail] Fri Oct 13 21:07:54 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!simtel!news.kei.com!ub!dsinc!netnews.upenn.edu!Lehigh.EDU!Lehigh.EDU!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: 13 Oct 1995 09:04:35 -0400
Lines: 35
Message-ID: <45lo53$[e-mail]>
NNTP-Posting-Host: ns2-1.cc.lehigh.edu

In article <45jjuu$[e-mail]>, [e-mail] (Woody Harper
) writes:
>Ok, here's a newbie question for today.
>
>The November 1995 Popular Electronics has a pretty neat project I want to
>build. The project is a 1/4 wave ground plane antenna. The main component
>in the antenna is an SO-239 panel mount connector. The author of the
>article claims that the connector must be silver plated as nickel plating
>will not work. Why? I am having a devil of a time finding silver plated
>SO-239 connectors in Phoenix, but can get nickel plated for $5.00 at
>Radio Shack. The author does not explain why he feels that only silver
>will work and I have no clue. Thanks in advance for any help.
>
>--
>-------------------------------------------------------------------------------
>Home Page: http://www.primenet.com/~lager
>
I would suspect that silver was specified over nickel due to outdoor
application. The silver will give better conductivity over nickel when
corrosion occurs. However when you do put dissimilar metals together, galvanic
corrosion can exist at the interface. This would be dependent upon the two
metals and their respective positions in an electonegativity series.

Two dissimilar metals can also form a simple diode circuit. It would not be
unusual to get rf rectification off such an interface with subsequent tvi.
We do have a tendency to get hung up on the details and loose sight of the big
picture. I suspect the rest of the antenna is not silver plated so why worry
about dissimilar metals ???

My reccommendation is go with the Nickel and adequately weatherproof the
installation which is simply good engineering practice anyway. If you don't
get good results, don't be surprised if silver doesn't work any better.

Good Luck   73's    Dick K8WHA
>


From [e-mail] Fri Oct 13 21:07:55 1995
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Silver vs. Nickel: Why?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <45jjuu$[e-mail]> <45ljcm$[e-mail]>
Date: Fri, 13 Oct 1995 17:20:40 GMT
Lines: 27
Xref: news.epix.net rec.radio.amateur.antenna:16472 rec.radio.amateur.homebrew:11083

In article <45ljcm$[e-mail]> [e-mail] () writes:
>>The main component
>>in the antenna is an SO-239 panel mount connector. The author of the
>>article claims that the connector must be silver plated as nickel plating
>>will not work. Why? I
>
>Quite simply the answer is, that the author does not know, what he is
>talking about. Surely the silver plated connector has less loss, but the
>major concern is the plug that will mate with the connector. Unless you know
>pretty well how to do it, there is only little chance to mount the cable to
>the plug without substantial losses.

Actually, the author is probably concerned that the nickel plated
chassis fitting won't take solder well in the flange holes (for
the groundplane elements). Nickel plate is a pain in the a** to
get to take solder. Silver, OTOH, takes solder nicely.

However, if all you can find is nickel plated fittings, all is not
lost. Just file that blankety-blank plating off and the brass underneath
will take solder easily.

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 Oct 13 21:07:57 1995
Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!news.ia.net!news.sbt.net!news-out.internetmci.com!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: Fri, 13 Oct 95 15:57:11 GMT
Organization: TSE Systems
Lines: 64
Message-ID: <45m24i$[e-mail]>
References: <45jjuu$[e-mail]> <45ljcm$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.radio.amateur.antenna:16476 rec.radio.amateur.homebrew:11089

In article <45ljcm$[e-mail]>,
   [e-mail] () wrote:
>>The main component
>>in the antenna is an SO-239 panel mount connector. The author of the
>>article claims that the connector must be silver plated as nickel plating
>>will not work. Why? I
>
>
>Hi,
>
>Quite simply the answer is, that the author does not know, what he is
>talking about. Surely the silver plated connector has less loss, but the
>major concern is the plug that will mate with the connector. Unless you
know
>pretty well how to do it, there is only little chance to mount the cable
to
>the plug without substantial losses.
>
>My suggestion is to ise a N-typt connector if the cable is thick (RG213)
>or a BNC connector, if the cable is thinn enough.

Absolutely.  239-type connectors are not too good at either maintaining a
good connection or handling high frequencies.  Their only "advantage" is
low cost.  Especially at 800 MHz, N or BNC connectors should be used,
depending on the size of the cable to be used (which should be large if it
is more than a few feet long).

If this is one of those 1/4 wave pyramid-like antennas, the author probably
specified a silver connector because it is easier to solder the radial
wires on.  A connector with a Teflon center insulator is pretty much
essential for this as well as the other plastics tend to melt under
moderate heat.  The least expensive (Radio Shack grade) connectors are made
of plated zinc or brass; if you file the plating off the base metal
underneath can be soldered, but there may be problems with the insulator
melting.  Some of the mid-grade ones are nickel (or stainless?) throughout
and difficult to solder, even if filed.  The author may have had a bad
experience with one of those.  Silver or gold plated connectors are easiest
to solder and usually have the Teflon insulator.  Since an 800 MHz 1/4 wave
antenna is quite small, a gold-plated SMA may be a viable choice.

When soldering the radials on, it works best to heat the connector up first
and tin it, flowing solder around and through the holes.  Even with a
Teflon insulator, be careful not to overheat it.  A 100 Watt solder gun is
barely adequate.  If you use a torch do it carefully, keeping the flame
only on the flange of the connector and not the center where it could
damage the insulator.  After the connector is prepared, tin the ends of the
radial wires.  Then re-melt the solder on the connector one hole at a time
and join the radials on.  Careful heating is again required so only one
corner of the connector is hot enough to melt, but at the same time the
joint is not 'cold'.  If that seems impossible to do, some sort of jig
could be built to hold the radial wires in place while all the solder is
melted.

If the antenna is to be used outdoors, be sure to seal up the top side of
the connector (unless you have found a hermetically sealed military one)
and cable attachment to keep water out.  Silicone sealant should work for
this, though it may detune the antenna slightly.  It's also a good idea to
remove all solder flux before sealing.

This is probably entirely too many words about such a simple subject.  At
the same time, I've undoubtably left out much essential information.  Do I
qualify to write a magazine article yet?

-Mike KD4QDM


From [e-mail] Fri Oct 13 21:07:59 1995
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!elvis.delphi.com!uunet!in1.uu.net!world!wdr
From: [e-mail]
Subject: Re: Silver vs. Nickel: Why?
Message-ID: <[e-mail]>
Organization: Swamp-Castle Press, Boston
References: <45jjuu$[e-mail]> <45ljcm$[e-mail]> <[e-mail]>
Date: Fri, 13 Oct 1995 22:06:06 GMT
Lines: 33
Xref: news.epix.net rec.radio.amateur.antenna:16478 rec.radio.amateur.homebrew:11091

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
> >>The main component
> >>in the antenna is an SO-239 panel mount connector. The author of the
> >>article claims that the connector must be silver plated as nickel plating
> >>will not work. Why? I

> Actually, the author is probably concerned that the nickel plated
> chassis fitting won't take solder well in the flange holes (for

I've seen other versions of the article (the same antenna plan has been
published in *every* electronics magazine I've looked at sometime in the
last 6 months), the "author" recommends little nuts & bolts through the
flange holes to attach the ground-plane elements.  Gary's suggestion of
scraping down to brass sounds better if you don't plan to give it routine
maintenance...

The Radioshack antenna book has a tri-band version of this groundplane; it
hangs two L-shaped hooks on the main radiator to tune it to two other bands
(one at the base and another at a "node" up the main radiator).

I was thinking of trying one of these but replacing the ground-radials with
a miniature actual ground plane.  I've got a bulkhead BNC feedthrough that
I'm going to install in a pie-plate.  The pie-plat won't be a tuned
ground-wire, but it also won't poke me & will provide better near-field
shielding: I'm going to mount it on a pack-frame (with an adjustable lift)
for either/both/one-each my HT and cell-phone.  I got the idea from
someone who said they used a magmount rubber-ducky antenna on the
dinning room table with a pie-plate.

--
Bill Ricker, The Swamp-Castle Press    "The freedom of the press belongs
[e-mail]      N1VUX            to those who own one."--A.J.Lieberman


From [e-mail] Fri Oct 13 21:08:00 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!usenet.cis.ufl.edu!caen!ranecurl
From: [e-mail] (Rane Curl)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: 13 Oct 1995 22:35:07 GMT
Organization: University of Michigan Engineering, Ann Arbor
Lines: 16
Message-ID: <45mpir$[e-mail]>
References: <45jjuu$[e-mail]> <45ljcm$[e-mail]> <[e-mail]>
NNTP-Posting-Host: [e-mail]
Xref: news.epix.net rec.radio.amateur.antenna:16479 rec.radio.amateur.homebrew:11092

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
[...snips...]
>However, if all you can find is nickel plated fittings, all is not
>lost. Just file that blankety-blank plating off and the brass underneath
>will take solder easily.

I take a 100W iron and acid flux to the nickel plated connectors and
tin them in advance, where I want to solder them later. This works
quite well with plugs too - tin the whole interior where the braid will be
soldered. You might want to connect the mating fitting to hold the
pin/socket in place, if the dielectric is not teflon. [I have another
trick for plugs, but this isn't the place...]

Rane Curl       N8REG



From [e-mail] Fri Oct 13 21:08:02 1995
Path: news.epix.net!news.sprintlink.net!news.netrail.net!news-out.internetmci.com!newsfeed.internetmci.com!chi-news.cic.net!simtel!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-ulm.de!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: 13 Oct 1995 11:43:18 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 20
Message-ID: <45ljcm$[e-mail]>
References: <45jjuu$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de
Xref: news.epix.net rec.radio.amateur.antenna:16480 rec.radio.amateur.homebrew:11093

>The main component
>in the antenna is an SO-239 panel mount connector. The author of the
>article claims that the connector must be silver plated as nickel plating
>will not work. Why? I


Hi,

Quite simply the answer is, that the author does not know, what he is
talking about. Surely the silver plated connector has less loss, but the
major concern is the plug that will mate with the connector. Unless you know
pretty well how to do it, there is only little chance to mount the cable to
the plug without substantial losses.

My suggestion is to ise a N-typt connector if the cable is thick (RG213)
or a BNC connector, if the cable is thinn enough.

73, Moritz DL5UH




From [e-mail] Fri Oct 13 21:08:03 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!news
From: [e-mail] (Klaus Sch÷nhoff)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Unknown tube: CX1622 by EEV
Date: Fri, 13 Oct 1995 17:09:32 GMT
Organization: RWTH-AACHEN
Lines: 10
Message-ID: <45m9q6$[e-mail]>
NNTP-Posting-Host: pc7195.dialup.rwth-aachen.de
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.homebrew:11084 sci.electronics:156229

I've just found a impressive looking vacuum tube named CX1622
manufactured by EEV. Does anyone know the original purpose of this
device? EEV?

-------------------------------
Elektronik Gruppe Aachen e.V.
Klaus Sch÷nhoff Tel: [phone]
[e-mail]
-------------------------------



From [e-mail] Tue Oct 17 16:12:40 1995
Path: news.epix.net!news.sprintlink.net!simtel!zombie.ncsc.mil!news.duke.edu!usenet
From: [e-mail] (James P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: "SINADDER" signal+noise+distortion meter
Date: Mon, 16 Oct 1995 00:26:35 GMT
Organization: Duke University, Durham, NC, USA
Lines: 35
Message-ID: <45se2l$[e-mail]>
References: <45ju7l$[e-mail]>
NNTP-Posting-Host: async87.async.duke.edu
X-Newsreader: Forte Agent .99b.112

[e-mail] (Peter Dalliessi) wrote:

>
>Does anyone know where I can find the design for a s/n+dist. measuring
>instrument?
>
>Such a device was made by a US company many years ago, and named a
>"SINADDER3".

     You will need to build a sine wave oscillator and a sharp null filter
to match the frequency of the oscillator.  Shoot for about 1 KHz.

     The oscillator modulates a signal generator that supplies the
receiver with a test signal.  The output of the receiver is connected to
the filter and then to an AC voltmeter.

     The voltmeter is used to measure the noise at the receiver output.
The filter can be switched in and out of the circuit.

     With the filter switched out, you can measure signal+noise+distortion
and that becomes one of the reference points for the db measurement.  With
the filter switched in, you're measuring noise+distortion only and that
becomes the second reference point.

     There are quite a few different schematics for oscillators and
filters.  Pick one that matches the contents of your junk box or is
easiest for you to understand and get working.  There's nothing much to go
wrong.  A sinadder is really pretty simple.  When I was using one, I never
paid much attention to the absolute readings in db and just used it as a
visual aid to tuning for minimum noise and distortion.

        Jim "no sig" Meyer  ("sig" = "signature")





From [e-mail] Tue Oct 17 16:12:41 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!newsfeed.internetmci.com!chi-news.cic.net!news.midplains.net!gw2.att.com!nntpa!ssbunews!not-for-mail
From: [e-mail] (Bob Parnass, AJ9S)
Subject: Re: "SINADDER" signal+noise+distortion meter
Message-ID: <[e-mail]>
Keywords: Helper Instruments, sensitivity, modulation acceptance
Sender: [e-mail] (Netnews Administration)
Nntp-Posting-Host: radioman.ih.att.com
Reply-To: [e-mail]
Organization: Bell Laboratories, Naperville, IL
References: <45ju7l$[e-mail]> <45se2l$[e-mail]>
Date: Mon, 16 Oct 1995 13:42:04 GMT
Lines: 27

In article <45se2l$[e-mail]>,
James P. Meyer <[e-mail]> wrote:

    >...  A sinadder is really pretty simple.  When I was using one, I never
    >paid much attention to the absolute readings in db and just used it as a
    >visual aid to tuning for minimum noise and distortion.

I have a few instruments which measure SINAD, including a Helper
Sinadder SL105, which is an RMS device.  If you want to perform
industry standard SINAD sensitivity measurements, the 12 dB mark
becomes important.  Too, I think the current EIA standard for land
mobile specifies an RMS SINAD measurement (vs. the average response
type of measurement available in the SL103 model).

SINAD measuring equipment can also be used to determine the modulation
acceptance of NBFM receivers.

BTW, Helper Instruments, maker of the Sinadder line of SINAD meters,
is still alive and well. They can furnish reprints of informative
articles on SINAD.  Sorry, I don't have the address in front of me.
Helper used to advertise in Mobile Radio Technology but I don't
see their ads in most the recent issues.
--
==============================================================================
Copyright 1995, Bob Parnass, AJ9S                              [e-mail]

                      Locate transmitter sites with RadioMap(tm)


From [e-mail] Tue Oct 17 16:12:42 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: "SINADDER" signal+noise+distortion meter
Date: 16 Oct 1995 23:51:42 GMT
Organization: Hewlett-Packard
Lines: 16
Message-ID: <45ur6e$[e-mail]>
References: <45ju7l$[e-mail]> <45se2l$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <45se2l$[e-mail]>,
James P. Meyer <[e-mail]> wrote:
>[e-mail] (Peter Dalliessi) wrote:
>
>>
>>Does anyone know where I can find the design for a s/n+dist. measuring
>>instrument?
>>
>>Such a device was made by a US company many years ago, and named a
>>"SINADDER3".

I happen to have a schematic for the "SINADDER" that dates back to 1976.
Is that of any use, or must you have "SINADDER 3"?

Rick Karlquist N6RK
[e-mail]


From [e-mail] Tue Oct 17 16:12:42 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 723 REGULATOR
Date: 16 Oct 1995 21:11:18 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 3
Distribution: world
Message-ID: <45uhpm$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

See the 1995 ARRL Handbook, Power Supply Chapter for some
tips regarding the 723 regulator.



From [e-mail] Tue Oct 17 16:12:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.third-wave.com!usenet
From: [e-mail] (gary robison)
Newsgroups: rec.radio.amateur.homebrew
Subject: 8873 tube
Date: 12 Oct 1995 00:46:17 GMT
Organization: Third Wave Development
Lines: 3
Message-ID: <45hogp$[e-mail]>
NNTP-Posting-Host: pp8.third-wave.com
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Any one have a 8873 a less than poor house price...even used!
If i can locate one I will have to punch a hole in the back of
this old SB230 and add air I guess.....Thanks Gary ...K3SJX


From [e-mail] Tue Oct 17 16:12:44 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Mark Manuelian )
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Anybody used Ramsey FX-440 for 9600?
Date: 15 Oct 1995 09:46:04 GMT
Organization: Netcom
Lines: 5
Message-ID: <45ql8s$[e-mail]>
References: <4332ef$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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A friend of mine and I each built one, both experienced the same poor
spurious performance.  All synth had many huge spurs.  Some shielding
of the VCO and decoupling helped...a little.  We never used the radios,
there just weren't clean enough in receive and transmit. They were a
good education in kit building and debugging tho...


From [e-mail] Tue Oct 17 16:12:45 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!felix.TECLink.net!usenet
From: "Mark J. Acierno" <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Anybody used Ramsey FX-440 for 9600?
Date: 15 Oct 1995 14:48:37 GMT
Organization: TECLink Internet Services: [e-mail]
Lines: 17
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Xref: news.epix.net rec.radio.amateur.digital.misc:12260 rec.radio.amateur.homebrew:11117

My recommendation is to avoid the unit unless they have made major
design
changes since the original radio (the 2-m version failed the transmitter
spurious output test -- see the QST review from about a year ago).

Jeff, k9ja
---


Do you know which copy of qst this was in??? I'm about 95% of the way
through builing my ramsey kit and this does not make me happy to read!

thanx
mark
n2uem




From [e-mail] Tue Oct 17 16:12:46 1995
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From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Anybody used Ramsey FX-440 for 9600?
Date: 16 Oct 1995 11:17:22 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 39
Message-ID: <45tf02$[e-mail]>
References: <4332ef$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com
Xref: news.epix.net rec.radio.amateur.digital.misc:12274 rec.radio.amateur.homebrew:11144

In article <[e-mail]>,
Jeffrey Austen <[e-mail]> wrote:
>In Article <[e-mail]>, [e-mail] (James D. Cronin) wrote:
>>
>>Does the Ramsey FX-440 transceiver kit actually work for 9600 baud packet?
>>I have friend-of-a-friend word that Ramsey claims it works on 9600 baud
>>packet, but nobody has actually been able to get it going quite right.
>
>Some time ago I bought their kit.  I found that the receiver suffered from
>many spurious responses which, given right (wrong?) packet frequency would
>make it pretty useless.  I did get it to receive 9600 but had a pretty
>strong signal to work with and didn't make any performance measurements so
>I can't really comment on the receive performance.  The transmitter was a
>disaster!  Because they have no shielding anywhere in the radio the
>transmitter output got back into the PLL and the resultant signal resembled
>broadband noise.  I wasted a lot of time trying to clean that up and never
>was successful.  I believe that  taking the time to build a good shield
>around the PLL would have solved the problem but there are problems with
>the board layout that make it a  difficult thing to do.  I did find a few
>minor design errors which resulted a very long (for 9600 packet) TR
>turnaround time.  They directly modulate the VCO, like most radios, so the
>transmitter will distort the signal.  I never got far enough to worry about
>that.

I built one of these for a friend, and I also noted the very noisy
transmit audio.

I tend to believe the noisy transmit audio is due to the use of a
fairly noisy op-amp in the loop filter and audio chain driving a
VCO with a fairly high sensitivity.  The VCO gain is in excess
of 10MHz/V over most of the range;  less than 100uV of noise in the
op-amp output will result in about 1KHz of deviation!  This noise
will also show up in the receiver LO and degrade the receiver
audio, too.

--
 * 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 Oct 17 16:12:47 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!natinst.com!not-for-mail
From: [e-mail] (Mike Klopfer)
Newsgroups: sci.physics.electromag,sci.math.num-analysis,rec.radio.amateur.homebrew
Subject: approximation for Green's function of a dielectric slab on a conducting ground plane
Date: 16 Oct 1995 17:55:22 -0500
Organization: National Instruments, Austin, TX
Lines: 10
Distribution: inet
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Xref: news.epix.net sci.physics.electromag:6800 sci.math.num-analysis:24555 rec.radio.amateur.homebrew:11152


I'm interested in trying to implement some Method of Moments code for
microstrip circuits. I've been looking at the method of Chow, Yang and
Fang in IEEE Trans. MTT Vol 39 no. 3 March 1991 pgs 586-592 for
approximating the Green's function of a dielectric slab on a conducting
ground. I was wondering if anyone would have any suggestions for other
methods or if there is any code already available. Thanks for your help.

mike



From [e-mail] Tue Oct 17 16:12:48 1995
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From: [e-mail] (Ross G. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Balanced Line Microphones
Date: 15 Oct 1995 04:11:02 GMT
Organization: Baylor University
Lines: 15
Message-ID: <45q1km$[e-mail]>
NNTP-Posting-Host: bilbo.baylor.edu
X-Newsreader: TIN [version 1.1 PL8]

Hey all,
  I'm tossing around the idea of buiding a desktop microphone for my radios.
  Radio Shack sells a fairly inexpensive mike that is unidirectional (seems
 like a good idea in this application) and is mounted on its own gooseneck.
  The only signifigant drawback is that it is fed with 3-wire "balanced" line.
 (This is how Radio Shack describes it.)
  My question is:  In this context, does balanced mean the same thing as when
 refering to antenna feedline.  If so, what is the third wire for?  Does the
 mike need a DC bias?  Also, can I just use a regular balun to convert it back
 to two wire, unbalanced feed?  (R.S. sells adaptors, but they're $14.)

  Thanks,
  Ross
  KB2RVB



From [e-mail] Tue Oct 17 16:12:49 1995
Path: news.epix.net!news.sprintlink.net!news.edge.net!news
From: jim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Balanced Line Microphones
Date: 15 Oct 1995 14:50:24 GMT
Organization: Gutbang Entertainment
Lines: 48
Message-ID: <45r73g$[e-mail]>
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Ross


>  I'm tossing around the idea of buiding a desktop microphone for my radios.
>  Radio Shack sells a fairly inexpensive mike that is unidirectional (seems
> like a good idea in this application) and is mounted on its own gooseneck.
>  The only signifigant drawback is that it is fed with 3-wire "balanced" line.
> (This is how Radio Shack describes it.)
>  My question is:  In this context, does balanced mean the same thing as when
> refering to antenna feedline.

yes and no...

>If so, what is the third wire for?

the 3rd wire is a ground

> Does the
> mike need a DC bias?

no DC bias is needed

> Also, can I just use a regular balun to convert it back
> to two wire, unbalanced feed?  (R.S. sells adaptors, but they're $14.)

I'm not sure what a 'regular' balun would be, but nothing of the sort is needed here.
all that is meant by balanced in this case is that neither of the audio lines from the
mic element is grounded, and both are available at the connector.  the 3rd wire is to
ground the case of the mic.

all you need to do is connect one of the two audio leads to the ground and the mic is now
unbalanced.  don't buy the RS adapters for $14 they are really crap and you're paying mostly
for the hardware, not the transformer inside.

the only other area of concern would be impedence matching, which should be easy to take
care of...

73 ke4juh
--

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

I'm never home, so Visit me anytime...
http://edge.edge.net:80/~gutbang/

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




From [e-mail] Tue Oct 17 16:12:50 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.fibr.net!usenet
From: [e-mail] (Ron Cole)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Balanced Line Microphones
Date: Sun, 15 Oct 1995 15:49:50 GMT
Organization: Fibrnet Internet Services
Lines: 27
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References: <45q1km$[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Ross G. Miller) wrote:

>Hey all,
>  I'm tossing around the idea of buiding a desktop microphone for my radios.
>  Radio Shack sells a fairly inexpensive mike that is unidirectional (seems
> like a good idea in this application) and is mounted on its own gooseneck.
>  The only signifigant drawback is that it is fed with 3-wire "balanced" line.
> (This is how Radio Shack describes it.)
>  My question is:  In this context, does balanced mean the same thing as when
> refering to antenna feedline.  If so, what is the third wire for?  Does the
> mike need a DC bias?  Also, can I just use a regular balun to convert it back
> to two wire, unbalanced feed?  (R.S. sells adaptors, but they're $14.)


Ross, A "Balanced" line microphone as described by Radio Shack is a
Low Impedance microphone.   The Signals are Hi, Low and Ground.  For
operation with Ham Gear connect the Low and Ground wires together.  DC
Bias would only be needed if the Microphone is a Condenser requiring
Phantom powering then you would need to apply 48vdc between the HI &
LO leads and ground.  If the microphone comes with the standard 3 Pin
Male XLR Connector the signals are Pin 1 - Shield or Ground,  Pin 2 -
Hi,  Pin 3 - Low.  Hope that Helps.

Ron Cole
N5HYH




From [e-mail] Tue Oct 17 16:12:51 1995
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From: [e-mail] (Watts)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Balanced Line Microphones
Date: 15 Oct 1995 09:41:50 -0600
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 25
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References: <45q1km$[e-mail]>
NNTP-Posting-Host: lamar.acns.colostate.edu
X-Newsreader: TIN [version 1.2 PL2]

Ross G. Miller ([e-mail]) wrote:
:   I'm tossing around the idea of buiding a desktop microphone for my radios.
:   Radio Shack sells a fairly inexpensive mike that is unidirectional (seems
:  like a good idea in this application) and is mounted on its own gooseneck.
:   The only signifigant drawback is that it is fed with 3-wire "balanced" line.
:   My question is:  In this context, does balanced mean the same thing as when
:  refering to antenna feedline.  If so, what is the third wire for?  Does the
:  mike need a DC bias?  Also, can I just use a regular balun to convert it back
:  to two wire, unbalanced feed?

It's balanced just like an antenna, but it's shielded because it's a very
low level signal, so you have the two wires carrying the signal and a shield.
If it's a *dynamic* mic, it doesn't need DC.  If it's a *condenser* or
*electret condenser*, it needs DC or (as we say in the biz) *phantom power*.
To truly unbalance the signal, you use a *transformer* (balun at low freqs)
and phantom power with a center tap in the transformer primary getting +48v
and using the shield as ground for phantom.
I use a Shure SM-58 (vocal mic of the stars) and all I do is connect a
balanced line to the mic and tie the shield and the - side of the mic
together at the mic plug.  Works great, and the improved audio seems to help
the other end understand what I'm saying.

Galen, KF0YJ
Colorado Concert Sound



From [e-mail] Tue Oct 17 16:12:52 1995
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Balanced Line Microphones
Date: Sun, 15 Oct 95 20:37:54 GMT
Lines: 17
Message-ID: <[e-mail]>
References: <45q1km$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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X-Newsreader: News Xpress Version 1.0 Beta #4

Ross,

The other comments in this thread have pretty well covered the issue, but
I just wanted to mention one thing.

The purpose of balanced microphone designs is to eliminate hum that could
otherwise result from common mode voltage being picked up on the shield of
an unbalanced system.

This isn't at all likely to be a problem in the typical ham shack, so
connecting the "Low" side to ground is an acceptable alternative to
purchasing a balanced to unbalanced adaptor.

73,

Jack  WB3U


From [e-mail] Tue Oct 17 16:12:53 1995
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From: BRETSKI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment
Subject: Can I use a 12 volt deep-cycle marine battery to ...
Date: Mon, 16 Oct 1995 13:41:13 -0500
Organization: Purdue University
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Fellow amateurs.

Can I use a 12 volt deep-cycle marine battery to:

1. Power my HTX202? If so can I use the same guage wire that I use
   with the gel cell? Pardon my ignorance but the battery is so big
   compared to the HT. The battery runs the 12 volt system in the
   camper.

2. Power my Radio Shack 30 watt power AMP? The AMP draws 6 amps
   of current continous and I think the in-line fuse is
   8 amps. I bought a regulated power supply from Radio Shack
   that pops its breaker at 2.5 amps. It is ok for packet
   but voice draws too much. The supply gives 13.8 VDC steady.
   The battery would give probably 12.5 VDC and slowly drain off, obviously.
   Any problem with that? Again does the guage of the wiring
   make a difference?

Finally, I built a 2 meter ground-plane antenna from 12 guage wire
and a RO-239(?) connector. It works well off my HT, but would like
to use the AMP to it. Would 30 watt power hurt it? It has one
verticle radiator and two radials.

Thanks de N9ZFF



BRET A. PENNINGTON /  COMPUTER TECHNICIAN   /EARTH AND ATMOSPHERIC SCIENCES
CIVL 4252 317-494-0678 / PURDUE UNIVERSITY  / WEST LAFAYETTE, INDIANA 47907
[e-mail]                   /     speaking only for myself.
/\/\/\/\/\/ __... /\/\/\/\/\/\/\/\ N9ZFF /\/\/\/\/\/ ...__ /\/\/\/\/\/\/\/\


From [e-mail] Tue Oct 17 16:12:54 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment
Subject: Re: Can I use a 12 volt deep-cycle marine battery to ...
Date: Mon, 16 Oct 95 19:43:09 GMT
Organization: TSE Systems
Lines: 60
Message-ID: <45ucdd$[e-mail]>
References: <[e-mail]>
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Xref: news.epix.net rec.radio.amateur.homebrew:11147 rec.radio.amateur.misc:93273 rec.radio.amateur.equipment:20582

In article
<[e-mail]>,
   BRETSKI <[e-mail]> wrote:
>Fellow amateurs.
>
>Can I use a 12 volt deep-cycle marine battery to:
>
>1. Power my HTX202? If so can I use the same guage wire that I use
>   with the gel cell? Pardon my ignorance but the battery is so big
>   compared to the HT. The battery runs the 12 volt system in the
>   camper.

Yes.  12V is 12V regardless of where it comes from.  The same gauge wire is
OK as well, since the HT will only draw as much current as it needs.  But
it is *vital* to place a fuse or circuit breaker of a size apropriate for
the capacity of the wire right at the battery, so the high short-circuit
current of the large battery won't cause a fire in case of a short.

>
>2. Power my Radio Shack 30 watt power AMP? The AMP draws 6 amps
>   of current continous and I think the in-line fuse is
>   8 amps. I bought a regulated power supply from Radio Shack
>   that pops its breaker at 2.5 amps. It is ok for packet
>   but voice draws too much. The supply gives 13.8 VDC steady.
>   The battery would give probably 12.5 VDC and slowly drain off,
obviously.
>   Any problem with that? Again does the guage of the wiring
>   make a difference?

This will work fine as well.  The amp may not output quite as much power
with 12.5 V instead of 13.8, but it won't damage anything.  The reason the
power supply works on packet is because the breaker is a thermal type that
does not trip instantly.  You are drawing 6A from the supply (actually
less, since the voltage will drop) in either case, but the breaker doesn't
have time to open on packet.  Wire of 16 gauge (what probably came with the
amp) is OK for short runs at the 8A level.  It is important to keep the
wiring short so the voltage at the amp stays as high as possible.  If the
wire must be more than a few feet long, consider going to 14, 12 or 10
gauge, not as a safety concern, but for higher performance.  Again, the
fuse should be located right at the battery so any possible shorts in the
wiring will cause it to blow.  The best way to tell if your wiring is
adequate is to measure the voltage at the amplifier and at the battery
while transmitting.  If this test shows more than 0.5V or so drop, larger
wire will probably get you more RF output.

>
>Finally, I built a 2 meter ground-plane antenna from 12 guage wire
>and a RO-239(?) connector. It works well off my HT, but would like
>to use the AMP to it. Would 30 watt power hurt it? It has one
>verticle radiator and two radials.

This will handle 30W just fine.  I have used such antennas at the 100W
level and they can probably handle much more.  The thing to be careful of
is to keep the antenna reasonably away (10' or more, but this is a
trade-off with loss in the coax) from the rest of your hardware and
'wetware' when running high power.  This is so the RF doesn't feed back in
to low-level circuits and cause problems. Moving the antenna straight up is
the best direction to take when moving it away.

-Mike KD4QDM


From [e-mail] Tue Oct 17 16:12:56 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (John Amdor III )
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment
Subject: Re: Can I use a 12 volt deep-cycle marine battery to ...
Date: 17 Oct 1995 02:58:05 GMT
Organization: Netcom
Lines: 70
Message-ID: <45v63t$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-smx-ca2-17.ix.netcom.com
X-NETCOM-Date: Mon Oct 16  7:58:05 PM PDT 1995
Xref: news.epix.net rec.radio.amateur.homebrew:11159 rec.radio.amateur.misc:93299 rec.radio.amateur.equipment:20606

In <[e-mail]>
BRETSKI <[e-mail]> writes:
>
>Fellow amateurs.
>
>Can I use a 12 volt deep-cycle marine battery to:
>
>1. Power my HTX202? If so can I use the same guage wire that I use
>   with the gel cell? Pardon my ignorance but the battery is so big
>   compared to the HT. The battery runs the 12 volt system in the
>   camper.

Yes.  The load (the radio) determines the size of the wire needed.
Since the '202 draws abt 1 amp on high power transmit, light guage wire
will be OK on either power source.

Physical size of the battery isn't the concern...voltage is.  The
larger battery will last longer (a lot longer, most of the time.)

>
>2. Power my Radio Shack 30 watt power AMP? The AMP draws 6 amps
>   of current continous and I think the in-line fuse is
>   8 amps. I bought a regulated power supply from Radio Shack
>   that pops its breaker at 2.5 amps. It is ok for packet
>   but voice draws too much. The supply gives 13.8 VDC steady.
>   The battery would give probably 12.5 VDC and slowly drain off,
obviously.

It will work fine.

>   Any problem with that? Again does the guage of the wiring
>   make a difference?

Depends on the length of the run from the amp to the battery.  The
longer the run, the larger guage of wire you need to reduce voltage
drop.

>
>Finally, I built a 2 meter ground-plane antenna from 12 guage wire
>and a RO-239(?) connector. It works well off my HT, but would like
>to use the AMP to it. Would 30 watt power hurt it? It has one
>verticle radiator and two radials.

No, the output of the amp will not hurt the ground plane.  Make sure
you have a good match (SWR) between the amp, or the protection circuit
of the amp will shut down the amp.

Curious...why didn't you add the other two radials?

>
>Thanks de N9ZFF
>
>
>
>BRET A. PENNINGTON /  COMPUTER TECHNICIAN   /EARTH AND ATMOSPHERIC
SCIENCES
>CIVL 4252 317-494-0678 / PURDUE UNIVERSITY  / WEST LAFAYETTE, INDIANA
47907
>[e-mail]                   /     speaking only for
myself.
>/\/\/\/\/\/ __... /\/\/\/\/\/\/\/\ N9ZFF /\/\/\/\/\/ ...__
/\/\/\/\/\/\/\/\

Have fun...

John
KD6MXL@KM6PX.#NOCAL.CA
[e-mail]




From [e-mail] Tue Oct 17 16:12:57 1995
Path: news.epix.net!news.sprintlink.net!news.wwa.com!news
From: Gary KF9CM
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cooling A 3-1000 Tube
Date: 16 Oct 1995 11:04:05 GMT
Organization: WorldWide Access - Chicagoland Internet Services
Lines: 9
Message-ID: <45te75$[e-mail]>
NNTP-Posting-Host: vh1-007.wwa.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)

I have used a 4" 110 cfm muffin fan in my 4-1000a for 3 years with no heating
problems. See the older handbooks(1960s) dealing with 3-1000 amplifiers for details.

                         73 Gary KF9CM



     (G)ot (A)nother (R)adio (Y)esterday



From [e-mail] Tue Oct 17 16:12:57 1995
Path: news.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: CQ test
Date: 17 Oct 1995 14:13:41 GMT
Organization: UniSQL, Inc.
Lines: 7
Message-ID: <460dml$[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

CQ test.


I'd type "break for a radio check" but this isn't a CB news group.

Jim



From [e-mail] Tue Oct 17 16:12:59 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: DDS Article in 73
Date: 16 Oct 95 17:43:52 GMT
Organization: ucsd usenet gateway
Lines: 23
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

There was a thread in one of the groups last week regarding the DDS article in
October 1995 73 magazine.  Someone on the list erroneously read the AD part of
AD7008 as being an AMD part number.  It isn't.  It's an Analog Devices part.  I
just talked to Theresa at Allied in Corpus Christi.  She said they are out of
stock right now but the 20 MHz part is $28.20 in onsies and the 50MHz part is
$33.85 in onsies.

I remember seeing the product announcement for the AD7008 last year but didn't
pay a lot of attention because of the price at the time.

I don't know about y'all but I can't imagine a discreet design that I could make
for $33.85.  The cheapest 10 bit DAC is on the order of $50.00.

I took my 1994 AD design catalog home over the weekend to look at the part more
closely.  This looks like a REALLY nice part.  It will do QAM digital
modulation, phasing SSB, and other nifty things all digitally!  The $5 price
difference for the extra 15 MHZ out of the 50 MHz part (you can only get up to
about 24 MHZ with the 50 MHZ clock part) seems like a really small difference.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Tue Oct 17 16:12:59 1995
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From: [e-mail] (Bill Kirkland)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS Article in 73
Date: 17 Oct 1995 14:25:02 GMT
Organization: Bell Northern Research Ltd.
Lines: 7
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References: <[e-mail]>
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X-Newsreader: News Xpress Version 1.0 Beta #4

The one thing about the AD7008 is that its output is very dirty and one needs
to employ proper filtering before using it on the air.  It does look like an
excellant part to be used with Rhode's article (he does mention it)
"A High-Performance Hybrid Frequency Synthesizer"

Bill Kirkland
VE3JHU


From [e-mail] Tue Oct 17 16:13:01 1995
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Subject: easy keyer circuit needed
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Tue, 10 Oct 95 20:52:37 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 38


>
>
> Surely there is an easy circuit I can build
> to key 700 Hz tones to a speaker.
> I want soemthing real simple to practice sending code.
>
>
> BRET A. PENNINGTON /  COMPUTER TECHNICIAN   /EARTH AND ATMOSPHERIC SCIENCES
> CIVL 4252 317-494-0678 / PURDUE UNIVERSITY  / WEST LAFAYETTE, INDIANA 47907
> [e-mail]                   /     speaking only for myself.
> /\/\/\/\/\/ __... /\/\/\/\/\/\/\/\ N9ZFF /\/\/\/\/\/ ...__ /\/\/\/\/\/\/\/\
>


Hi Bret... the simplest thing you could do is to use a battery, a
sonalert type of pieziolectric sounder and of course a key. These are
usually fixed at a higher frequency than 700 Hz though.

If you are hung up on hearing something close to 700 Hz then you might
want to build up a simple tone generator using a 555 timer IC...
sample circuits should be easily accessible.


Regards..

Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]

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



From [e-mail] Tue Oct 17 16:13:01 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!relay-4.mail.demon.net
From: "m.b.dissanayake" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: EIMAC 5CX 1500A-Ceramic tube
Date: Sun, 15 Oct 1995 22:18:36 GMT
Organization: None
Lines: 8
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: relay-4.mail.demon.net
X-Broken-Date: Sunday, Oct 15, 1995 22.18.36
X-Newsreader: Newswin Alpha 0.7

Would anyone have operating parameters and  electrode side contact
details for the above Ceramic Tube--for a Linear.
Many Thanks and 73's

Bish
m.b.dissanayake



From [e-mail] Tue Oct 17 16:13:02 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: EIMAC 5CX 1500A-Ceramic tube
Date: 16 Oct 1995 06:21:07 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
Message-ID: <45tbmj$[e-mail]>
References: <[e-mail]>
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Fil; 5v @ 38.5A  Bottom two rings.

Class AB1

Control Grid Around -90v (25 w max) third ring up

Screen 500 volts (75w disp) fourth ring up

Suppressor 0 v  (25w disp) fifth ring up

Anode 4 kV max (1500w disp) adj bias for zero signal Ip of  250 mA

Grid driven feedback C =  1/4 pF

Cooling requires .76 inch water column at sea level for 1500w disp.

Anything else?
73 Tom


From [e-mail] Tue Oct 17 16:13:03 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Green's function
Date: 17 Oct 1995 01:02:38 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 3
Distribution: world
Message-ID: <45uvbe$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

Gardiol "Microstrip Circuits" Wiley, 1994 suggests Harrington R.F.
"Field Computations by Moment Methods", New York, Macmillan 1968.



From [e-mail] Tue Oct 17 16:13:04 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!news.eden.com!matrix.eden.com!n5kzw
From: "Edwin J. Bailen" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help w/ Power Supply
Date: Sun, 15 Oct 1995 11:51:20 -0500
Organization: Adhesive Media, Inc.
Lines: 25
Message-ID: <Pine.BSD/[e-mail]>
References: <[e-mail]>
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On 13 Oct 1995, Michael Black wrote:

> [e-mail] (Todd Goins) is trying to fix
> a commercial power supply that uses a 723 voltage
> regulator and a bunch of pass transistors.
>
> jgoecks <[e-mail]> responded with some help
> but added that "it sounds like a linear regulator that
> uses a 3 terminal regulator to control pass transistors".
>
> <SNIP>
>
>       Michael  VE2BVW
> --
> | InterNet: [e-mail]
> | Standard disclaimer: The views of this user are strictly their own.
>
>
In March of 1974, Fairchild Published a Voltage Regulator Applications
Handbook that devotes 25 pages to the theory of operations and
applications for the LM723.  I have never found a better discussion of
the workings of the LM723.  I keep my copy under lock and key. ;=)

73 -- Ed Bailen  N5KZW


From [e-mail] Tue Oct 17 16:13:05 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Help with HP hybrid ID?
Date: 17 Oct 1995 01:02:50 GMT
Organization: Netcom
Lines: 8
Message-ID: <45uvbq$[e-mail]>
NNTP-Posting-Host: ix-pa14-12.ix.netcom.com
X-NETCOM-Date: Mon Oct 16  6:02:50 PM PDT 1995
Xref: news.epix.net rec.radio.amateur.homebrew:11155 sci.electronics:156693


I recently picked up a Hewlett-Packard 6dB hybrid, but I can't find any
information on it in my catalogs.  Can anyone help me with its
specifications?  Its model number is:  15520C

Thanks for your help!

- Jeff


From [e-mail] Tue Oct 17 16:13:06 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.interlog.com!io.org!torfree!freenet.toronto.on.ca!ab419
From: [e-mail] (Randie Kochals)
Subject: HF AMP SCHEMATICS?
Message-ID: <[e-mail]>
Sender: [e-mail] (Randie Kochals)
Reply-To: [e-mail] (Randie Kochals)
Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada
Date: Mon, 16 Oct 1995 03:10:09 GMT
Lines: 11


 I hope someone out ther can remember...  I just got hold of
a home-built 2-30 Mhz amp that uses two 7094 tubes.  I have
no information on this amp.  I think it may have been built
from a design in an early '70's ARRL book.

 Does anyone remember a design using these tubes?  If so,
where did you see it?  Any help would be greatly appreciated !

                             Thanks,
                             Randie


From [e-mail] Tue Oct 17 16:13:07 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!EU.net!uknet!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF AMP SCHEMATICS?
Date: Mon, 16 Oct 95 07:14:59 GMT
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]>
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   [e-mail] (Randie Kochals) wrote:

> I hope someone out ther can remember...  I just got hold of
>a home-built 2-30 Mhz amp that uses two 7094 tubes.  I have
>no information on this amp.  I think it may have been built
>from a design in an early '70's ARRL book.
>
> Does anyone remember a design using these tubes?  If so,
>where did you see it?  Any help would be greatly appreciated !

The only schematic I ever remember seeing in the Handbook with that tube
was the "Self-Contained 500-Watt Transmitter" in the 1962 edition.  The
transmitter used a single 7094 for 500 watts CW input on 80-10M.  The
bias to the driver and final could be switched to Class AB1 for input of
a low-level, on-frequency SSB signal.

73,

Jack  WB3U


From [e-mail] Tue Oct 17 16:13:07 1995
From: [e-mail] (Doug Reed)
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uunet!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Ic-245 Schematic
Message-ID: <[e-mail]>
Date: Sat, 14 Oct 1995 08:06:36 -0100
X-FTN-To: All
Lines: 27

I have an old Icom IC-245 2 meter FM rig with an AM/SSB adaptor.
Last week the LED frequency display went dark and it hasn't come
back on.  This naturally makes it difficult to tell what frequency
I'm on or if the radio even happens to be working.
.
I took it apart and found someone had already been soldering jumper
wires on the PLL board.  Makes it sound like this radio previously
exhibited similar difficulties.  I've seen several old Icom's that
had problems because of the lousy solder joints on the rivets they
used to connect traces on the double sided board.
.
Since this is the only SSB rig I have access to, I'd like to fix
it but don't have any schematic or documentation at all.  I tried
our local ham radio store but their service dept had no manual.
If you have a service manual or schematic for this radio, please
send me email and let me know what it will cost to get a copy.
If you have access to a FAX machine, you could FAX it to me at
work.  Just be sure to put my name on the cover sheet.
Thanks for your help.

73's.
.
Doug Reed, N0NAS               email: [e-mail]
2014 Radatz Ave                voice: 612-777-0064
St Paul, MN  55109-1413        FAX:   [phone]




From [e-mail] Tue Oct 17 16:13:08 1995
Path: news.epix.net!news.sprintlink.net!simtel!news.kei.com!newshost.marcam.com!uunet!in1.uu.net!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet
From: Grant H Youngman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ic-245 Schematic
Date: 14 Oct 1995 14:52:22 GMT
Organization: PSI Public Usenet Link
Lines: 16
Message-ID: <45oir6$[e-mail]>
References: <[e-mail]>
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To: [e-mail]

[e-mail] (Doug Reed) wrote:
>I have an old Icom IC-245 2 meter FM rig with an AM/SSB adaptor.
>Last week the LED frequency display went dark and it hasn't come
>back on.  This naturally makes it difficult to tell what frequency
>I'm on or if the radio even happens to be working.
>.

Have you tried contacting Icom directly?

They can be reached at www.icomamerica.com (look at the menu once you get
to that page), or direct to Icom customer/tech support at
[e-mail].  Gary Fiber is the normal contact point at the
latter and is very helpful.

Grant/NQ5T



From [e-mail] Tue Oct 17 16:13:09 1995
Path: news.epix.net!news.sprintlink.net!simtel!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan
From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of AM car radio
Date: 14 Oct 1995 17:48:53 GMT
Organization: The Greater Detroit Free-Net
Lines: 6
Message-ID: <45ot65$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


Years ago, the input impedance for auto radios was designed for
600 ohms.  That was prior to FM being included as a standard
feature. But I seem to recall that it has not changed, for several
reasons.
--


From [e-mail] Tue Oct 17 16:13:10 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.tele.fi!news.inet.fi!usenet
From: [e-mail] (Osmo Vuorio)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of AM car radio
Date: 15 Oct 1995 10:46:25 GMT
Organization: Telecom Finland, Engineering
Lines: 22
Message-ID: <45qoq1$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: vuorios1.dial.tele.fi
X-Newsreader: WinVN 0.92.6+

In article <[e-mail]>, [e-mail] (Muenzler, Kevin) says:

>Generally the impedance of an AM/FM car radio is about 75 ohms.
>Impedance of the "old" AM only radios (transistor) was also about 75
>ohms.  The really old (tube) AM radios had an impedance of between
>75 and about 95 ohms.

The difference between the antenna inputs of the new and the old
AM(/FM) car radios is the way the input cicuit has been designed.

Earlier there was generally a resonant circuit in the antenna
input and a trimmer capacitor - for the cable capacitance.

Today the input stage of the AM receiver may be a single FET,
as a wideband buffer amplifier (the high/low impedance converter).

But the AM radio input impedance has nothing to do with 75 Ohms.
The main problem is the antenna cable capacitance. Today, it
works as a capacitive shunt due the non resonant input circuit.
So - the new cheap design is worse than the old, in this case.

Osmo, OH2EU


From [e-mail] Tue Oct 17 16:13:11 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!van-bc!news.mindlink.net!news
From: [e-mail] (Andrew Taylor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Info on building an autopatch
Date: 16 Oct 1995 19:34:47 GMT
Organization: MindLink
Lines: 7
Message-ID: <45uc4n$[e-mail]>
NNTP-Posting-Host: line108.nwm.mindlink.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

Hi Im interested in setting up an autopatch, no major thrills
needed for it.  If you can tell me how to go about it or point
me in the right direction Id appreciate it.  (VHF BAND)

73's
VE7ZXC



From [e-mail] Tue Oct 17 16:13:11 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!qbc-clic!com18!cybercop
Newsgroups: rec.radio.amateur.homebrew
In-Reply-To: [e-mail]
Subject: Kenwood on Internet?
From: [e-mail]
Message-ID: <[e-mail]>
Date: Tue, 17 Oct 95 01:50:00 EST
Organization: Babillard COM18 BBS
Lines: 4

I need to know if I can reach Kenwood via Internet?
I think my TM-742 has a big problem...  :(  HELP!!!

[e-mail]


From [e-mail] Tue Oct 17 16:13:12 1995
Path: news.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!newshost.anu.edu.au!workshop1.anu.edu.au!Ron.Cruikshank
From: [e-mail] (Ronald Cruikshank)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ladder Line .. how to make?
Date: Mon, 16 Oct 1995 12:52:05 LOCAL
Organization: Australian National University
Lines: 7
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: 150.203.15.249
Summary: How do you make ladder line?
Keywords: transmission lines
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

Hello from down under,
I am looking for any clues on making ladder line (approx 450 ohms or
thereabouts). What do you use for spreaders, how do you fix them to the line
etc etc.    Thanks, Ron.  VK1NRC.

_______________________________________________________________
Ron Cruikshank


From [e-mail] Tue Oct 17 16:13:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.telalink.net!uro!jackatak!root
From: [e-mail] (Jack GF Hill)
Subject: Re: Ladder Line .. how to make?
Organization: Jack's Amazing CockRoach Capitalist Ventures
Date: Mon, 16 Oct 1995 12:39:44 GMT
Message-ID: <[e-mail]>
References: <[e-mail]>
Keywords: transmission lines
Sender: [e-mail] (System nerd)
Lines: 37

[e-mail] (Ronald Cruikshank) writes:
> I am looking for any clues on making ladder line (approx 450 ohms or
> thereabouts). What do you use for spreaders, how do you fix them to the line
> etc etc.
Let's see...

An older copy of the Handbook should have all the formulae to allow
you to calc the spacing for whatever impedance you want.

As for spreaders, Popsicle sticks used to make great spreaders when I
was a kid (L-O-N-G time ago! ;^) and there were several wrapping
methods in vogue. Again, a handbook would be a great information
source...
              b
Zo = 276 log ---
              a

Where:
b is the center-to-center distance between conductors
a is the radius of the conductor (same units as b)

The spreader fastening technique in teh 1959 Handbook is to drill a
small hole in the spreader for the fastening wire, and simply wrap the
fastening wire around the transmission line wire. Popsicle sticks
don't drill too well, so a groove at each end worked for me...

Good luck, and HAVE FUN!!!
--
73,
Jack, W4PPT/M (75M SSB 2-letter WAS #1657/#1789 -- both from the mobile! ;^)

+--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+
| Jack GF Hill        |Voice: [phone] -             Ham Call: W4PPT |
| P. O. Box 1685      |Modem: [phone] -  Bicycling and SCUBA Diving |
| Brentwood, TN  37024|Fax:   [phone] -          Life Member - ARRL |
| [e-mail]  - "Plus ca change, plus c'est la meme chose" |
+--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+


From [e-mail] Tue Oct 17 16:13:14 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!pagesat.net!maw.montana.com!news
From: [e-mail] (bowman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ladder Line .. how to make?
Date: 16 Oct 1995 16:09:28 GMT
Organization: Montana Online
Lines: 24
Message-ID: <45u03o$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ptm22.montana.com
X-Newsreader: WinVN 0.92.6+

In article <[e-mail]>, [e-mail] (Ronald Cruikshank) says:
>. What do you use for spreaders,

polystyrene, plexiglas, phenolic, teflon

> how do you fix them to the line

run the wire through the holes. if using bare wire, put a small bead
of solder on each side of the spreader, or you can use epoxy.

>etc etc.


Z0 = 276 *  log(2S/d)

where Z0 = characteristic impedance in ohms
       S = distance between conductor centers
       d = outer diameter of conductor

12 AWG at 2" would be about 450 ohms.


hope this helps.  73 de kc7dma



From [e-mail] Tue Oct 17 16:13:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!simtel!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!pcies4.trl.OZ.AU!ddiamond
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ladder Line .. how to make?
Date: Tue, 17 Oct 1995 12:16:02
Organization: TRL
Lines: 39
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pcies4.trl.oz.au
Summary: How do you make ladder line?
Keywords: transmission lines
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]



>Hello from down under,
>I am looking for any clues on making ladder line (approx 450 ohms or
>thereabouts). What do you use for spreaders, how do you fix them to the line
>etc etc.    Thanks, Ron.  VK1NRC.

>_______________________________________________________________
>Ron Cruikshank
 G'day Ron. Daycom (03 ) 9543 6444 have 450 ohm ladder line.

However, if you want to make your own open wire line; cut up some 1/8" or
1/4" thick perspex into rectangles, about 1 X 2" .  You will need sufficient
for one spacer each 24" or so of line.

Drill a 1/16" hole through  each end of the rectangle, about 1/8" from each
end.

Using a triangular file, form a well-defined v-groove in the centre of each
end (corresponding to the 1/16" hole).

Obtain some plain copper wire (not insulated), about # 14 gauge (try
non-ferrous metal merchants). Measure out a pair, of required length. No kinks.

Anchor one end of the pair to a solid object, about 1 or 2 feet above ground.

Tie the other end of the pair to the tow-ball of your car.

Use the vehicle to impart just sufficient tension to remove the wrinkles, and
maintain a nice tension on the pair. Hand-brake & Park.

One at a time, insert you spacers between the pair so that the spacer is held
captive between the v-grooves. Use a single strand of plain #18 copper wire
threaded through each 1/16" hole to hold the pair onto the spacer. Wrap the
wire around each side, and solder. Repeat for the number of spacers required.

73 Drew, VK3XU.




From [e-mail] Tue Oct 17 16:13:16 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ladder Line .. how to make?
Date: Mon, 16 Oct 1995 16:47:53 -0700
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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In-Reply-To: <[e-mail]>

Jack---after many years of making open wire line, some with very strange
impedances, I think I have found the most convient, and best spreader
material possible!  It is rather simple stuff when you think about
it---air hose material used to transfer air from a manifold to an air
gun!  Usually, for no good reason it is yellow in color and retains a
coiled shape when relaxed.  Not that short lengths would matter.  The
best construction method is simply to burn a hole in the material some
half inch from the ends of the cut off piece whose length you have
already determined using log 276 b/a.  Then slit the end back to the hole
with a knife.  Simply press in the spreader with the wire line, into the
hole.  Insulated or bare wire can be used, just change the size of the
hole!  Nothing has even come close to the longevity here on the ocean
front than this system.  luck with it  73  de Cliff W6HDO Morro Bay, CA



From [e-mail] Tue Oct 17 16:13:17 1995
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From: '.Allan.W..Bart@'.Allan.W..Bart@*user@*site.*domain.org.org (' Allan W. Bart)
Date: 13 Oct 95 20:08:00
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking to hear from Hams Who Built &3 VLF Calibration Outfi
Message-ID: <[e-mail]>
Organization: Fidonet: PandA's Den BBS Usenet: SATINS/Net330 uucp gateway * PandA's Den BBS *
Lines: 21


From: [e-mail] (' ALLAN W. BART)
Subject: Looking to hear from Hams Who Built &3 VLF Calibration Outfit
Organization: Maestro Technologies, Inc.

Hi,

Last year 73 Magazine published a series of articles on building a
complete setup for calibration; receiver, comparator and a oven based
xtal calibrator. So if you have put together this setup, please email me
and let me know how it works.

allan

WA2RZQ
--
|Fidonet:  ' Allan W. Bart 1:330/204.1
|Internet: '.Allan.W..Bart@'.Allan.W..Bart@*user@*site.*domain.org.org
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Tue Oct 17 16:13:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Looking to hear from Hams Who Built &3 VLF Calibration Outfi
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]>
Date: Sun, 15 Oct 1995 08:54:38 GMT
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Sender: [e-mail]

Allan W. Bart wrote:
: Last year 73 Magazine published a series of articles on building a
: complete setup for calibration; receiver, comparator and a oven based
: xtal calibrator. So if you have put together this setup, please email me
: and let me know how it works.

I built it and it "works" in the sense that the circuit performs as
advertised when bench tested. However, I live in Virginia and am at the
far fringes of the NIST 60 KHz transmitter coverage area.  The
transmitter is in Colorado. There is just not enough usable field
strength in the area where I live. It is compounded by high levels of
industrial noise and RFI at those frequencies. I would say if you lived
west of the Appalachian mountains you would have a better chance. The
NIST time and frequency division will send you a field strength chart
and information if you ask.

One area of the circuit that could be improved would be the detector.
It uses a simple diode envelope detector which is a horror for the
high noise levels and low signal strength which I've experienced. Using
a PLL instead would probably aid in digging the carrier out of the muck.
At least that would recover the frequency information. Taking it one
step further and building a synchronous detector on top of the PLL
would probably recover the modulation information too.

Thomas (KI4N)
[e-mail]


From [e-mail] Tue Oct 17 16:13:19 1995
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From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: More antenna fun.
Date: 13 Oct 1995 18:30:41 GMT
Organization: Inlink
Lines: 19
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In article <[e-mail]>,
[e-mail] says...
>
>   BRETSKI <[e-mail]> wrote:
>
>>So I brought the thing in this AM to work and used our iron which
>>goes to 850+ F. That did a GREAT job. It all flowed together
>>nicely.
>     << snip >>
>>BRET A. PENNINGTON / COMPUTER TECHNICIAN  /EARTH AND ATMOSPHERIC SCIENCES
>
>Wow, that's really hot!  What kind of computers do you use that on?
>
>73,
>
>Jack  WB3U

Trashed 80's of course!!!



From [e-mail] Tue Oct 17 16:13:20 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: More on Code Practice Oscillators
Date: 16 Oct 95 14:41:29 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I saw a post in Sunday's digest with a suggestion for using a Sonalert. (a
reasonable suggestion).  It started me thinking back to when I was trying to get
my code speed up for the 100th time.

I found when using the computer program that I had considerable fatigue when
using 700 Hz.  My ears hurt like the dickens after about 10 minutes.  If I
lowered the tone to about 500Hz or 550 Hz it was much more comfortable.  Has
anyone else had such experience?  Does anyone have any idea why 700 Hz was ever
chosen as a quasi standard?

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Tue Oct 17 16:13:21 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: More on DDS
Date: 16 Oct 95 18:37:09 GMT
Organization: ucsd usenet gateway
Lines: 41
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I just called AD to request that they do the only improvement that I think the
AD7008 needs:  It needs quadrature outputs for image reject receive mixers.

I got a request for the specs for the chip:

2 speed classes:  20 MHz and 50 MHz

on board sine and cosine lookup tables for doing I/Q stuff
two 10 bit multipliers and adder for doing I/Q stuff digitally

serial interface as well as either 8 bit or 16 bit parallel microprocessor
interface

32 bit phase accumulator

2 frequency registers so you could for instance set both TX and RX frequencies
and switch in one cycle from one to the other

a phase adjust register for doing direct phase modulation


As you can see this device is capable of simultaneously performing all three
types of modulation(phase, frequency, and amplitude) all digitally!

They have a Fax Back number: [phone]

request document number 1240, but be ready!  It is 17 pages!

The biggest problem with the design in 73 magazine is that the author put all of
the computer smarts on the same board as the DDS.  If he had put the RF stuff on
one board and the computer stuff on another it would allow for one RF design to
be used in several system designs.

My favorite computer for control is a 8088 in minimum mode with one ROM and 1
SRAM and maybe an 8255 and 8250.  This can be wire wrapped if desired and is
still useful and for under $20 (I have a lot of ROMS in the junk box).

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Tue Oct 17 16:13:23 1995
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From: [e-mail] (William Houston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola Engineering Brief Help Needed!!
Date: 15 Oct 1995 21:18:06 GMT
Organization: Your Organization
Lines: 50
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In article <45mmf8$[e-mail]>, jstrohm@blazer says...
>
>Replace the 33 ohm bias resistor with a NON-INDUCTIVE unit (what the
>other poster said).
>
>I built one of these amps some years ago and used a 2-watt carbon resistor,
>raised about 3/4 inch off the PCB.  It worked fine.
>
>Although it probably wasn't necessary, I added a couple of slip-on round
>aluminum heatsinks, w/ heatsink compound, on the body of the resistor.
>They were loose enough to slip and slide, so I doubt they gave any added heat dissipation.
>
>The resistor never discolored, so it was well within its power range.
>
>This is the cheap way. I think Vishay now owns Carborundum, who makes
>leaded non-inductive resistors.  You can also get planar thick-film
>non-inductive resistors (they look like a TO-220 transistor with 2 leads)
>but I don't have a source.  Both these are expensive.
>
>In a pinch you could substitute a bunch of paralleled 1/2 W resistors.
>Since you're building a CB lee-nyar amplifier, I'll leave the determination
>of values to you.
>
>good luck, you're on the right track.
>
>Jim N6OTQ
>
>
Guys,
A few thoughts.  First the 33 ohm resistor is there to supply dc and provide a voltage drop for the diode thus
limiting the current it has to pass.  The diode is there to set the bias voltage at one silicon diode voltage
drop about .7Vdc.  The base bias resistors R5 and R6 (10 ohms each) are in parallel with the base emitter
junctions of each transistor.  If the diode were adjustable (as this voltage source is in most designs) then
it would be a simple matter of lowering the value and measuring the effects.  However, by decreasing the value
of the 10 ohm resistors to say 9 or 8 ohms the same effect could possibly be seen.  Also, I notice that the
parallel equivalent input impedance  (real part) of the MRF455 is about twice that of the MRF454.  I realize
that this is impedance and measured at 30MHz but it suggests to me that possible changes to the input bias
network as well as the input RF network might be in order here.  At any rate, it should prove useful to
experiment with the bias resistors mentioned by lowering their values.  Finally, the reason the 33 ohm is
wirewound is to ac isolate the power supply from the base network inputs.  Even though the connection point of
this resistor is to the common mode point of the transformer secondary there could be significant amounts of
ac present if the transformer is not well balanced.  This could find it's way back into the power supply.  I
wouldn't recommend changing it to another type.  However, the reason it works ok without being wirewound is
probably more of a testament to the transformer balance and board layout than anything else.  I agree that
there is a danger with an inductor becoming self resonant.  The question then becomes at what frequency this
occurs and will there be an adequate path for oscillation should this occur.  I would imagine that H.O.
Granberg had this well in mind when he selected the particular wirewound resistor for this design.

73 William N6AGV



From [e-mail] Tue Oct 17 16:13:24 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Chris Boone <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OK, 49MHZ to 6 meter: HELP!!!
Date: 15 Oct 1995 17:16:29 GMT
Organization: GSU/ENTERGY
Lines: 13
Message-ID: <45rfld$1ci$[e-mail]>
References: <45701a$[e-mail]>

Yep...just re xtal and retune.....they go right onto 6 mtr FM...

WB5HJV in Houston area did several years ago...

73
Chris
WB5ITT

--

Chris Boone WB5ITT                     Compuserve 72732,2610
PO Box 3102                            FIDO 1:106/4267
Conroe, Texas 77305-3102               Sysop WBBS @ 409-447-4267


From [e-mail] Tue Oct 17 16:13:24 1995
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From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Old radio repairs near Dallas
Date: Sat, 14 Oct 1995 22:36:36 GMT
Organization: Internet America
Lines: 9
Message-ID: <45pe66$[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

Does anybody know where I can get an old tabletop shortwave rx
repaired in/near Dallas, TX?  I have a friend who is not technically
inclined, but is attatched to the old radio and would like to have it
fixed.
Thanks,
Kerry Miller
WD5ABC




From [e-mail] Tue Oct 17 16:13:26 1995
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From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 14 Oct 1995 07:46:41 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 97
Message-ID: <45npt1$[e-mail]>
References: <[e-mail]> <45mgk5$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <45mgk5$[e-mail]>,
Richard Karlquist <[e-mail]> wrote:
>In article <[e-mail]>,
> <[e-mail]> wrote:
>>
>>
>>
>>I'm in the process of designing a PLL/VCO to eliminate the need for
>>crystals on a bunch of lowband GE mobile rigs that my club aquired for
>>use on 6 meters.
>>I plan on using the serial MC145157 along with a PIC or 87C750 single
>>chip micro and a VCO made up of discrete parts.
>>
>>I'd like to hear from some experienced designers of LPF/VCO circuits
>>for your suggestions/comments.
>>
>>Thanks !
>>
>>Hugh Duff  VA3TO  Toronto               [e-mail]
>>
>>
>>---
>> ■ NFX v1.3 [000]
>>
>>--
>>---------------------------------------------------------------------
>>  HumberNet LSS (Learning Support System) - Humber College, Toronto
>>     "Tomorrow's communication and learning environment, today"
>>          Visit our Website at http://humnet.humberc.on.ca/
>>
>
>Trying to replace a multiplied-up crystal oscillator with a simple
>minded synthesizer consisting of a '157 and VCO is asking for trouble
>with spurious sidebands.  Unless you really need a lot frequency
>agility, you would be far better off negotiating a group purchase
>of crystals by the club.  This is one of those projects where anyone
>who knows enough about the technology to know what is involved wouldn't
>want to do it.  (BTW, if you "want to learn about synthesizers", pick
>an easier neophyte project).

Though I don't claim to hold a candle to Rick's experience, I have
a couple of comments.  I essentially agree with him; synthesizing
at a lower frequency and multiplying up is asking for trouble with
reference sidebands.  The problem is, the '157 is limited to around
15 or 16MHz (lemme guess; the radios use rocks multiplied by 3, and
therefore look reasonable for the '157 to synthesize).  Suppose
you have a x3 chain after your transmit oscillator; to get a 5KHz
channel spacing, you need to run the PLL with a reference of 5KHz/3,
or about 1700Hz.  Getting adequate suppression of this reference
component in the output of the phase detector will be a pain in the
butt, not to mention the PLL will likely take a lot longer to lock
up than you really want.  So, you _could_ use an adaptive loop
filter to widen the PLL loop bandwidth until you start to detect
lock and then narrow it considerably, but you'll never be happy
with it.

If you're willing to select another PLL chip, I suspect you can get
better results.  To start with, I suggest you select a PLL that can
synthesize directly on frequency; the MC145170 immediately springs
to mind, this chip is good to at least 160MHz (and it is easier to
program than the '157).  Using a '170, you could run the VCO at the
1/3 frequency and take the feedback frequency from the multiplier
chain after it has been multiplied to on frequency.  Here, your
reference is whatever the desired channel spacing is, say 5KHz.
There's something else that happens that you may not expect, though;
the reference sidebands will be at 5KHz intervals at the VCO output
which is then multiplied by 3.  You'll have a radio with a 5KHz
reference PLL but the transmitted reference sidebands will be at
15KHz intervals!  If you can do a decent job of suppressing them
in the loop filter, they may not be objectionable in the transmitter
output and will be outside the passband of most receivers; your
synth won't exhibit the 5KHz whine that virtually every Japanese
FM radio does today.  You'll have a 15KHz whine but no one will
normally here it.  The risk is that these sidebands will cause
more interference to adjacent channel users than you want to live
with.

With all this said, Rick is right; buy the crystals.  You see,
even if you build a PLL that generates a decent carrier, you've
still got to modulate it.  If the radio is a phase modulated
type, this isn't a problem, it would just work.  However, if this
is a radio that modulates the rock, you'll have to develop a VCO
with decent linearity and reasonably constant modulation sensitivity
across the band.  This isn't easy at all.

If you have some '157s, build a few 10-15MHz synthesizers and
experiment with loop filters, if you haven't already.  It is
novel to see that the reference sidebands are clearly there when
tuning around on your HF receiver, and it is novel to hear the
PLL bounce onto frequency.

Take care!

--
 * 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 Oct 17 16:13:28 1995
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From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 14 Oct 1995 12:46:56 GMT
Organization: Net Access - Philadelphia's Internet Connection
Lines: 55
Message-ID: <45obg0$[e-mail]>
References: <[e-mail]> <45mgk5$[e-mail]> <45npt1$[e-mail]>
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>There's something else that happens that you may not expect, though;
>the reference sidebands will be at 5KHz intervals at the VCO output
>which is then multiplied by 3.  You'll have a radio with a 5KHz
>reference PLL but the transmitted reference sidebands will be at
>15KHz intervals!  If you can do a decent job of suppressing them
>in the loop filter, they may not be objectionable in the transmitter
>output and will be outside the passband of most receivers; your
>synth won't exhibit the 5KHz whine that virtually every Japanese
>FM radio does today.  You'll have a 15KHz whine but no one will
>normally here it.  The risk is that these sidebands will cause
>more interference to adjacent channel users than you want to live
>with.

This is absolutely wrong! If it were true, you would never be able to
accomplish voice modulation at the rock frequency then multiply up. The
voice sidebands, by this argument, would be spaced 3x apart from where
they should be! Clearly, this doesn't happen.
What really would happen is that the incidental modulation from the 1700
hz sidebands would be 3x as great at the output frequency as it was
coming out of the synthesizer. 1700 hz is a workable reference frequency
for x3 post multiplication... you just have to be careful with the loop
filtering. It's done all the time. If you want the 1700 hz whine at the
output frequency to be 40db down, then it has to 50 db down at the
Fo/3 input frequency.
>
>With all this said, Rick is right; buy the crystals.  You see,
>even if you build a PLL that generates a decent carrier, you've
>still got to modulate it.  If the radio is a phase modulated
>type, this isn't a problem, it would just work.  However, if this
>is a radio that modulates the rock, you'll have to develop a VCO
>with decent linearity and reasonably constant modulation sensitivity
>across the band.  This isn't easy at all.

This is partially true. If the radio employed phase modulation of the
crystal oscillator output, then it will modulate the synthesizer output
equally well...a CW carrier is a CW carrier - the modulator doesn't know
where it came from. On the other hand, if the radio modulated the
oscillator directly by 'pulling' the crystal, then you'll have to put the
modulation audio into the VCO. This is easily done by using an op-amp
mixer to AC couple the modulation into the DC contol voltage.
There are also plenty of other clever ways to get the same result. The
important goal is that the coupling must not upset the bandwidth and
performance of the loop filter.
Practically any VCO you build will have plenty of linearity to allow +/-
1.6 Khz of deviation.If you want a VCO design that will cover up to an
octave tuning range and is virtually foolproof, E-mail me. The real trick
will not be getting the synthesizer to work properly, but in solving the
subtle problems related to driving the radio properly. Of course, you'll
never get more of an agile range than the radio tuned circuits are
designed for, but you can become independent of pesky crystals over the
limited design range of the radio.
>




From [e-mail] Tue Oct 17 16:13:30 1995
Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!nntpgate.primenet.com!nntpdist.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 15 Oct 1995 03:32:42 GMT
Organization: Primenet [phone]
Lines: 81
Message-ID: <45pvcq$[e-mail]>
References: <[e-mail]> <45mgk5$[e-mail]>
NNTP-Posting-Host: usr5.primenet.com
NNTP-Posting-User: ctrask
X-Newsreader: TIN [version 1.2 PL2]

In article <[e-mail]>,
 <[e-mail]> wrote:
>
>
>
>I'm in the process of designing a PLL/VCO to eliminate the need for
>crystals on a bunch of lowband GE mobile rigs that my club aquired for
>use on 6 meters.
>I plan on using the serial MC145157 along with a PIC or 87C750 single
>chip micro and a VCO made up of discrete parts.
>
>I'd like to hear from some experienced designers of LPF/VCO circuits
>for your suggestions/comments.
>
>Thanks !
>
>Hugh Duff  VA3TO  Toronto               [e-mail]
>
>
>  HumberNet LSS (Learning Support System) - Humber College, Toronto
>     "Tomorrow's communication and learning environment, today"
>          Visit our Website at http://humnet.humberc.on.ca/
>

Hugh,
        Let's see if we can give you a more posotive response to your in-
quiry.  First of all, the MC145XXXseries of synthesizers has been greatly
surpassed in spurious performance by both Plessey (expensive [$35]) and,
lately, National Semiconductor (cheap [$7]).

        The National PLLatinum synthesizers are serially programmed, as is
the MC145157.  They have incorporated an improved frequency/phase detector
which greatly improves the phase noise normally encountered (not a real
concern unless you're dealing with high rate data) and also greatly re-
duces the reference spur problem, by around 20 dB or thereabouts.

        The LMX1501 and LMX1511 will operate up to 1.1 GHz, obviously in-
tended for personal communications.  You can get free sample kits from
them by calling them at 1-800-272-9959, or contact a local manufacturer's
representative.

        For your VCO, consider taking the easy route and use one of the
devices made by Mini-Circuits.  At $17 apiece, they're hard to beat.

        By the way:  Could you possibly help me in locating a couple of ar-
ticles from Elektor Electronics?  I've never heard of this magazine, and I
got the impression from the original poster that it is Canadian.  I was un-
able to contact him due to a faulty Internet address in his posting.  I
would also greatly appreciate a subscription card or telephone number by
which to contact them.

        The articles are:

Joseph Carr. See "Small Loop Antennas for MW, AM BCB, LF and VLF Reception"-
Elektor Electronics, June '94 and July '94 (excellent! Theory, with formulas
& several practical designs. Wire loop type antennas. I built one- which
works).

J. Barendrecht, "Wideband Active Loop Antenna"- Elecktor Electronics,
March '95. Uses BF981 MOSFET, 2N5109. Remote location, with power fed up the
coax. Full details, including circuit board.

        Oh yes, the address is:

                Chris Trask
                P.O. Box 25240
                Tempe, Arizona 85285-5240

        Thanks in advance for your assistance.

                                                Regards,

                                                Chris Trask


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


From [e-mail] Tue Oct 17 16:13:31 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!eastnews1.East.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 15 Oct 1995 04:53:24 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 26
Message-ID: <45q444$[e-mail]>
References: <[e-mail]> <45mgk5$[e-mail]> <45npt1$[e-mail]> <45obg0$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <45obg0$[e-mail]>, Rocci  <[e-mail]> wrote:
>
>>There's something else that happens that you may not expect, though;
>>the reference sidebands will be at 5KHz intervals at the VCO output
>>which is then multiplied by 3.  You'll have a radio with a 5KHz
>>reference PLL but the transmitted reference sidebands will be at
>>15KHz intervals!  If you can do a decent job of suppressing them
>>in the loop filter, they may not be objectionable in the transmitter
>>output and will be outside the passband of most receivers; your
>>synth won't exhibit the 5KHz whine that virtually every Japanese
>>FM radio does today.  You'll have a 15KHz whine but no one will
>>normally here it.  The risk is that these sidebands will cause
>>more interference to adjacent channel users than you want to live
>>with.
>
>This is absolutely wrong! If it were true, you would never be able to
>accomplish voice modulation at the rock frequency then multiply up. The
>voice sidebands, by this argument, would be spaced 3x apart from where
>they should be! Clearly, this doesn't happen.

Oh, yeah.  You're right.  Oh, goodness, am I embarrased.

--
 * 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 Oct 17 16:13:32 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!brutus.bright.net!usenet.eel.ufl.edu!news.interlog.com!io.org!reptiles.org!westonia!humnet.humberc.on.ca!hduff
Subject: PLL/VCO homebrew designs
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Sun, 15 Oct 95 15:04:37 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 68



> In article <[e-mail]>,
>  <[e-mail]> wrote:
> >
> >
> >
> >I'm in the process of designing a PLL/VCO to eliminate the need for
> >crystals on a bunch of lowband GE mobile rigs that my club aquired for
> >use on 6 meters.
> >I plan on using the serial MC145157 along with a PIC or 87C750 single
> >chip micro and a VCO made up of discrete parts.
> >
> >I'd like to hear from some experienced designers of LPF/VCO circuits
> >for your suggestions/comments.
> >
> >Thanks !
> >
> >Hugh Duff  VA3TO  Toronto               [e-mail]
> >



> Trying to replace a multiplied-up crystal oscillator with a simple
> minded synthesizer consisting of a '157 and VCO is asking for trouble
> with spurious sidebands.  Unless you really need a lot frequency
> agility, you would be far better off negotiating a group purchase
> of crystals by the club.  This is one of those projects where anyone
> who knows enough about the technology to know what is involved wouldn't
> want to do it.  (BTW, if you "want to learn about synthesizers", pick
> an easier neophyte project).
>
> Rick Karlquist N6RK
> [e-mail]
>


Hmm... Jumping to conclusions ?  Did I say anywhere that the frequencies
that I would synthesize would be at the crystal fundamentals ?

"This is one of those projects where anyone who knows enough about the
technology to know what is involved" ...would know that bypassing the
multiplication stages in the radio and just generating the highest
and closest to the operating frequency with the PLL/VCO would be best
approach (which IS indeed the way it is going to be done).
I'm operating the PLL/VCO at half the required frequency and running it
through 1 doubler stage within the radio. The doubled frequency runs
through a bandpass filter, spurs are not an big issue.

You might want to brush up on your personability skills...
"...simple minded synthesizer..." and your approach in general ceratinly
don't contribute positively to the spirit of homebrewing !

Hugh Duff  VA3TO  Toronto





---
 ■ NFX v1.3 [000]

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     "Tomorrow's communication and learning environment, today"
          Visit our Website at http://humnet.humberc.on.ca/



From [e-mail] Tue Oct 17 16:13:33 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!newsfeed.internetmci.com!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: PLL/VCO homebrew designs
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Sun, 15 Oct 95 11:44:02 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 68



> In article <[e-mail]>,
>  <[e-mail]> wrote:
> >
> >
> >
> >I'm in the process of designing a PLL/VCO to eliminate the need for
> >crystals on a bunch of lowband GE mobile rigs that my club aquired for
> >use on 6 meters.
> >I plan on using the serial MC145157 along with a PIC or 87C750 single
> >chip micro and a VCO made up of discrete parts.
> >
> >I'd like to hear from some experienced designers of LPF/VCO circuits
> >for your suggestions/comments.
> >
> >Thanks !
> >
> >Hugh Duff  VA3TO  Toronto               [e-mail]
> >



> Trying to replace a multiplied-up crystal oscillator with a simple
> minded synthesizer consisting of a '157 and VCO is asking for trouble
> with spurious sidebands.  Unless you really need a lot frequency
> agility, you would be far better off negotiating a group purchase
> of crystals by the club.  This is one of those projects where anyone
> who knows enough about the technology to know what is involved wouldn't
> want to do it.  (BTW, if you "want to learn about synthesizers", pick
> an easier neophyte project).
>
> Rick Karlquist N6RK
> [e-mail]
>


Hmm... Jumping to conclusions ?  Did I say anywhere that the frequencies
that I would synthesize would be at the crystal fundamentals ?

"This is one of those projects where anyone who knows enough about the
technology to know what is involved" ...would know that bypassing the
multiplication stages in the radio and just generating the highest
and closest to the operating frequency with the PLL/VCO would be best
approach (which IS indeed the way it is going to be done).
I'm operating the PLL/VCO at half the required frequency and running it
through 1 doubler stage within the radio. The doubled frequency runs
through a bandpass filter, spurs are not an big issue.

You might want to brush up on your personability skills...
"...simple minded synthesizer..." and your approach in general ceratinly
don't contribute positively to the spirit of homebrewing !

Hugh Duff  VA3TO  Toronto





---
 ■ NFX v1.3 [000]

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



From [e-mail] Tue Oct 17 16:13:34 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news-feed-1.peachnet.edu!galileo.sct.edu!root
From: [e-mail] (Jeffrey Otterson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 17 Oct 1995 07:47:13 -0400
Organization: Southern College of Technology, Atlanta
Lines: 5
Message-ID: <460541$[e-mail]>
References: <[e-mail]> <45mgk5$[e-mail]>
NNTP-Posting-Host: st6000.sct.edu

You could probably achieve better results using a DDS instead of a PLL synth.
There have been DDS articles in QST and 73 recently.  These would easily
triple up to the 6-meter band.




From [e-mail] Tue Oct 17 16:13:35 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!panix!news.columbia.edu!watsun.cc.columbia.edu!jbaltz
From: [e-mail] (Jerry B Altzman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QEX and QST?
Date: 15 Oct 1995 01:35:12 GMT
Organization: double ionizers association
Lines: 14
Message-ID: <45pogg$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: watsun.cc.columbia.edu

In article <[e-mail]>,
Robert J. Schneider <[e-mail]> wrote:
>Hi.
>Did the September issue of QEX ond the October issue of QST
>arrive somewhere?

I got my October (and November) QST's but I haven't yet seen my September
QEX.

>Robert Schneider       DB1JJ

//jbaltz
jerry b. altzman   Entropy just isn't what it used to be      [phone]
[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


From [e-mail] Tue Oct 17 16:13:36 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QEX and QST?
Date: 15 Oct 1995 03:35:27 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 14
Message-ID: <45pvhv$[e-mail]>
References: <[e-mail]> <45pogg$[e-mail]>
NNTP-Posting-Host: sprite154.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)

[e-mail] (Jerry B Altzman) wrote:
>In article <[e-mail]>,
>Robert J. Schneider <[e-mail]> wrote:


>I got my October (and November) QST's but I haven't yet seen my September
>QEX.



Ditto

N7WS



From [e-mail] Tue Oct 17 16:13:37 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!torn!news.unb.ca!coranto.ucs.mun.ca!gledrew
From: [e-mail] (Gerald D. LeDrew)
Newsgroups: rec.radio.amateur.homebrew
Subject: RC Ham Technical?
Date: 15 Oct 1995 02:26:17 GMT
Organization: Memorial University of Newfoundland
Lines: 7
Message-ID: <45prg9$[e-mail]>
NNTP-Posting-Host: terra.nlnet.nf.ca
X-Newsreader: TIN [version 1.2 PL2]

Hello to any Radio amateur model flyers....
      Trying to modify radios to make JR and hitec more
compatible....Would appreciate any info....


Thank you....& 73's
De VO1ET Jerry


From [e-mail] Tue Oct 17 16:13:38 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!newsfeed.internetmci.com!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: Remote mounting RFI ??
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Sun, 15 Oct 95 10:11:29 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 45



I'm in the process of adding a synthesizer to a GE lowband mobile radio
to eliminate the need for 6M crystals. This may lead to a club project
since we have aquired a few skids of these radios, one for each member.
These radios are trunk mounted with a remote head.  The synthesizer
consisting of a small single chip micro to program the serial interfaced
PLL chip will be located inside the radio chassis. Channel selection
will be done from a switch located of course at the head (on the car
dashboard). The distance from the head to the radio in the trunk will be
roughly 10 - 15 feet.

I am wondering if RFI from the engine might play havok with the channel
selection lines that lead into the synthesizer micro ? It was suggested
to me that I consider some means of protection on the channel select
lines since the micro may be vulerable to noise (other than simple
bypass caps to ground). My dilema is in trying to keep the design as simple
as possible with minimal parts count, I'd prefer to avoid the extra
hardware if not essential.  I observed that some of my other commercially
made Ham gear which is remote mounted uses a 4 wire interface
(pwr/gnd/rx/tx) that runs between the trunk mounted main chassis and the
head.  The wiring runs directly from one micro in the head to another micro
in the main chassis (no buffering or protection) and it seems to work just
fine.  Should I assume that RFI will not be a problem or should I practice
good design technics and incorporate some protection ?
I presume that running the same wiring through the engine compartment
would definitely require some protection but since I'm going the
other way and further away from the noise that it should not be a real
problem.

Any comments/suggestions welcome.

Thanks..Hugh Duff  VA3TO  Toronto



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From [e-mail] Tue Oct 17 16:13:39 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!pagesat.net!maw.montana.com!news
From: [e-mail] (bowman)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: 14 Oct 1995 06:38:24 GMT
Organization: Montana Online
Lines: 20
Message-ID: <45nlt0$[e-mail]>
References: <45jjuu$[e-mail]>
NNTP-Posting-Host: ptm15.montana.com
X-Newsreader: WinVN 0.92.6+
Xref: news.epix.net rec.radio.amateur.antenna:16490 rec.radio.amateur.homebrew:11095

In article <45jjuu$[e-mail]>, [e-mail] (Woody Harper) says:
>
>Ok, here's a newbie question for today.
>
>in the antenna is an SO-239 panel mount connector. The author of the
>article claims that the connector must be silver plated as nickel plating
>will not work.

i haven't seen this particular article. is it the deal where you solder
the 1/4 wave vertical in the conductor pin, and 4 radials in the mounting
holes of the connector?

if so, the only problem is soldering to the connector shell. it can be done.
use a file to cut through the chrome layer of the plating, clean the area
well, and use a lot of paste flux. i use a propane torch to solder. unless
you have a BIG soldering iron, the connector will suck out so much heat that
the cheap plastic insultation will melt down. get right in there with the
blue cone of the torch, hit it with plenty of solder, and cool it with a
wet rag or sponge before doing the next corner.



From [e-mail] Tue Oct 17 16:13:40 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: 14 Oct 1995 05:04:16 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 25
Message-ID: <45ngcg$[e-mail]>
References: <45jjuu$[e-mail]> <45ljcm$[e-mail]> <[e-mail]> <[e-mail]>
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Xref: news.epix.net rec.radio.amateur.antenna:16502 rec.radio.amateur.homebrew:11103

[e-mail] wrote:

[snip]

>I was thinking of trying one of these but replacing the ground-radials with
>a miniature actual ground plane.  I've got a bulkhead BNC feedthrough that
>I'm going to install in a pie-plate.  The pie-plat won't be a tuned
>ground-wire, but it also won't poke me & will provide better near-field
>shielding: I'm going to mount it on a pack-frame (with an adjustable lift)
>for either/both/one-each my HT and cell-phone.  I got the idea from
>someone who said they used a magmount rubber-ducky antenna on the
>dinning room table with a pie-plate.


In the "good ol' days" back in 1960 something, we used to acquire aluminum transcription disks
from radio and TV stations and use them for ground planes for two meter verticals. As I
recall, these were about 16" in diameter with a hole in the middle that could be enlarged for
a (gasp) SO-239. These were ALL silver-plated in those days <g>. I even used one as a GP in my
1956 Corvette (how I wish I had that back, sigh)

Regards,

Wes -- N7WS




From [e-mail] Tue Oct 17 16:13:41 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!nntpgate.primenet.com!nntpdist.primenet.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: 15 Oct 1995 14:23:22 GMT
Organization: Primenet
Lines: 8
Message-ID: <45r5gq$[e-mail]>
References: <45jjuu$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip045.phx.primenet.com
X-Newsreader: IBM NewsReader/2 v1.2
Xref: news.epix.net rec.radio.amateur.antenna:16515 rec.radio.amateur.homebrew:11116

        Although in this case it does not apply...

        There is some Mil-spec that I haven't memorized ;) deeming that only silver
plated connectors will be used at uhf frequencies. The iron content of the nickel plate
causes some magnetic problems.
        Can some clear this up? I cannot recall the source or the details.

        Jim     N7TCF


From [e-mail] Tue Oct 17 16:13:42 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: Sun, 15 Oct 1995 09:56:49 -0700
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 34
Message-ID: <[e-mail]>
References: <45jjuu$[e-mail]> <45ljcm$[e-mail]> <[e-mail]> <[e-mail]> <45ngcg$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
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NNTP-Posting-User: cbuttsch
In-Reply-To: <45ngcg$[e-mail]>
Xref: news.epix.net rec.radio.amateur.antenna:16523 rec.radio.amateur.homebrew:11124

Wes, those old transcription disks were just superb as ground planes!
Living near the ocean, we rapidly found the vinyl coating superb, but the
ability to survive a wind storm somewhat questionable! 73 Cliff  W6HDO


On 14 Oct 1995, Wes Stewart wrote:

> [e-mail] wrote:
>
> [snip]
>
> >I was thinking of trying one of these but replacing the ground-radials with
> >a miniature actual ground plane.  I've got a bulkhead BNC feedthrough that
> >I'm going to install in a pie-plate.  The pie-plat won't be a tuned
> >ground-wire, but it also won't poke me & will provide better near-field
> >shielding: I'm going to mount it on a pack-frame (with an adjustable lift)
> >for either/both/one-each my HT and cell-phone.  I got the idea from
> >someone who said they used a magmount rubber-ducky antenna on the
> >dinning room table with a pie-plate.
>
>
> In the "good ol' days" back in 1960 something, we used to acquire aluminum transcription disks
> from radio and TV stations and use them for ground planes for two meter verticals. As I
> recall, these were about 16" in diameter with a hole in the middle that could be enlarged for
> a (gasp) SO-239. These were ALL silver-plated in those days <g>. I even used one as a GP in my
> 1956 Corvette (how I wish I had that back, sigh)
>
> Regards,
>
> Wes -- N7WS
>
>
>
>


From [e-mail] Tue Oct 17 16:13:43 1995
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news5.ner.bbnplanet.net!news3.near.net!monk.proteon.com!jfw
From: [e-mail] (John Woods)
Subject: Re: Silver vs. Nickel: Why?
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: kerplop.proteon.com
Organization: Proteon, Inc., Westborough, Ma.
References: <45jjuu$[e-mail]> <45ljcm$[e-mail]>
Date: Mon, 16 Oct 1995 14:45:34 GMT
Lines: 11
Xref: news.epix.net rec.radio.amateur.antenna:16549 rec.radio.amateur.homebrew:11141

[e-mail] () writes:
>Quite simply the answer is, that the author does not know, what he is
>talking about. Surely the silver plated connector has less loss,

Even this isn't necessarily true.  Apparently one sometimes finds
(relatively) cheap silver-plated coax connectors where the manufacturer
didn't bother polishing the underlying metal first (which is a more
expensive step than a thin silver layer!), and the resulting rough
surface ends up having more loss than a (polished) nickel surface.
(Source: "The Radioman", at a talk given at the Boxboro Convention
a couple of years ago.)


From [e-mail] Tue Oct 17 16:13:44 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Silver vs. Nickel: Why?
Date: 16 Oct 1995 14:53:00 GMT
Organization: American Radio Relay League
Lines: 18
Message-ID: <45trkc$[e-mail]>
References: <45jjuu$[e-mail]> <45r5gq$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
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.antenna:16551 rec.radio.amateur.homebrew:11142

[e-mail] wrote:
>       Although in this case it does not apply...
>
>       There is some Mil-spec that I haven't memorized ;) deeming that only silver
>plated connectors will be used at uhf frequencies. The iron content of the nickel plate
>causes some magnetic problems.

The Andrew catalog has some information. Seems that if you run
the legal limit, you can generate IMD products around 120 dB down.
I don't consider this something worth worrying about.

Zack KH6CP/1

BTW, I never had trouble soldering nickel plated Amphenol
connectors--with shiny new connectors I don't even
file or polish them. I made a whole bunch of antennas like
this for a July 1991 QST article.



From [e-mail] Tue Oct 17 16:13:45 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!usenet.cis.ufl.edu!usenet.ufl.edu!gnv.ifas.ufl.edu!icbr.ifas.ufl.edu!laipis
Newsgroups: rec.radio.amateur.homebrew
Subject: Tachometer circuit designs?  Help.
Message-ID: <[e-mail]>
From: [e-mail]
Date: 15 Oct 95 12:05:44 -0500
Organization: ICBR
Nntp-Posting-Host: icbr.ifas.ufl.edu
Lines: 17

Hello, apologize in advance if this is wrong group, but I figure you guys
can point me in right direction.  I want to build a tachometer (Hall effect
or optical) for use with two outboard motors.  Digital preferred, but analog
OK.  Speed range 500 -> 6000 rpm, and if digital, only need 2 or 2 and a half
digits.  I know it can't be very hard, or even very expensive, because I have
an $18.95 Nashbar bike computer that does more than I want except it doesn't
respond fast enough (dies at about 2000 rpm).  It's a Hall device, and I put
the magnet on a disk on a variable speed motor to try it out.  I've seen
commercial optical tachs for about $150, but they are way too bulky and
again, more than I need (they were used to measure centrifuge rotor speeds).
One motor is a 8 hp, and there is no electrical output.  I've looked in the
Grafe "Encyclopedia of Elect. Circuits" in my public library, and nothing looks
applicable.  I can build just about anything, but design is out of my range.
TIA, and any help is apreciated.

Phil Laipis, Dept. of Biochemistry and Molecula
[e-mail]


From [e-mail] Tue Oct 17 16:13:46 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.flinet.com!usenet
From: [e-mail] (hrsil)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TS 520SE HALF POWER
Date: 15 Oct 1995 12:06:33 GMT
Organization: Florida Internet
Lines: 17
Message-ID: <45qtg9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: wpb30.flinet.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <[e-mail]>, [e-mail]
says...
>
>My TS-520SE has dropped to half power output. I,m still able to make DX
>contacts, though. Is it possible that one final is no good or do they have
to
>work as a pair? .
Ray My 520s did the same thing for a number of weeks before they died, but It
was recomended to me to replace both 6146s at the same time. Not that their a
matched set or anything. I did try to measure around and try to check the
driver condition before I did any replacing however, since this is a common
problem with the 12by7's. By the way the 800v stays on the finals for quite
some time after the unit is turned off!(ouch)observe safty practices!!!!!
        I'm new to vacuum tubes but gave the 520s a good working over with
advice found here on the newsgroups.
  Henry   KE4WBW



From [e-mail] Tue Oct 17 16:13:47 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!calliope.wln.com!news.scn.org!scn.org!bb840
From: [e-mail] (James Aeschliman)
Subject: Re: TS 520SE HALF POWER
Message-ID: <[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail] (James Aeschliman)
Organization: Seattle Community Network
References: <[e-mail]>
Date: Mon, 16 Oct 1995 02:00:40 GMT
Lines: 17


In a previous article, [e-mail] (Ray Fennessey) says:

>
>My TS-520SE has dropped to half power output. I,m still able to make DX
>contacts, though. Is it possible that one final is no good or do they have to
>work as a pair? .
>
It sounds like the heater for one of the finals blew.  Back when novices
were limited to 75 watts input, the way to do it was to remove one of the
finals (actually to remove the matched pair and put in a single 6146B,
then put the matched pair back in after upgrading).

73 de KD7MK
--
Jim Aeschliman                      [e-mail]
Black Diamond, Washington           KD7MK


From [e-mail] Tue Oct 17 16:13:48 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TS 520SE HALF POWER
Date: Mon, 16 Oct 95 07:25:04 GMT
Organization: TSE Systems
Lines: 58
Message-ID: <45t161$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <[e-mail]>, [e-mail] (James Aeschliman) wrote:
>
>In a previous article, [e-mail] (Ray Fennessey) says:
>
>>
>>My TS-520SE has dropped to half power output. I,m still able to make DX
>>contacts, though. Is it possible that one final is no good or do they
have to
>>work as a pair? .
>>
>It sounds like the heater for one of the finals blew.  Back when novices
>were limited to 75 watts input, the way to do it was to remove one of the
>finals (actually to remove the matched pair and put in a single 6146B,
>then put the matched pair back in after upgrading).
>
Several possibilties:

(1) Something is wrong with the radio other than a bad final tube.
(2) One of the final tubes quit working, the other is fine.
(3) Both final tubes are down to about 50% of original capacity.

#1 is not too likely, assuming the power has dropped slowly as would be
expected with a tube wearing out.  But it could be the driver tube.
#2 is really unlikely, unless the heater or something else became open.
#3 seems most likely.  The tubes are connected in parallel, so they should
be replaced at the same time so they share the load equally.

As James suggests, you could test the tubes by trying them one at a time,
or if it is the heater just look in and see that both light up.  This will
detect condition #2, but not differentiate #3 from #1.  Another poster
noted that the high voltage stays present for quite a while after switching
off, and it's also important while running one tube not to let the plate
lead for the other tube short out on anything.  There is about 800 VDC and
a lot of RF there.  After opening the tube compartment (with the power
unplugged, of course), discharge the tube plate caps (the terminal on top
of the tube) to ground before touching them.

If you have #2 or #3, the cure is the same: two new tubes.  Since they are
connected in parallel, it's not a good idea to only change one as they
won't share the load equally.  Probably using pairs of tubes of the same
brand, from the same manufacturer's lot would match well enough, although
some places offer (at a higher price), "matched pairs".  (As an aside, does
anyone know what parameter is measured and 'matched' in these?  Cutoff
bias?)

Just running one tube in a circuit intended for two might put the driver
plate/final grid circuit out of tune without the capacitance of the other
tube's grid.  Using two weak tubes would be about as good as one good one,
and if that's enough to make the contacts you want to, you could stick with
that.  New tubes are only $12 - $20.00 each though so it's not a bad idea
to start looking for a couple to use as replacements or spares.  If
you're on the rock-cheap budget plan, boxes of these tubes can sometimes be
found used from low- (and even a few high-) band VHF commercial mobile
radios.  The part number 8298A is equivalent to 6146B.  Plain 8298 (6146A)
tubes have a lower power rating but might do OK in occasional use.

-Mike KD4QDM



From [e-mail] Tue Oct 17 16:13:49 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: Unknown tube: CX1622 by EEV
Date: Sun, 15 Oct 95 15:19:17 GMT
Organization: Home
Lines: 16
Message-ID: <[e-mail]>
References: <45m9q6$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
Xref: news.epix.net rec.radio.amateur.homebrew:11122 sci.electronics:156484

In article <45m9q6$[e-mail]>
           [e-mail] "Klaus Schnhoff" writes:

> I've just found a impressive looking vacuum tube named CX1622
> manufactured by EEV. Does anyone know the original purpose of this
> device? EEV?

EEV is the trade mark of English Electric Valve Co. Ltd, now part of
GEC.

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] Tue Oct 17 16:13:50 1995
Path: news.epix.net!usenet
From: [e-mail]
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Updated WWW Site
Date: Tue, 17 Oct 95 15:56:35 PDT
Organization: epix.net
Lines: 9
Message-ID: <NEWTNews.813970745.11764.amsoft@amsoft>
NNTP-Posting-Host: lwbyppp123.epix.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage
Xref: news.epix.net rec.radio.swap:49424 rec.radio.shortwave:65001 rec.radio.scanner:39760 rec.radio.amateur.space:5511 rec.radio.amateur.policy:31539 rec.radio.amateur.misc:93331 rec.radio.amateur.homebrew:11169 rec.radio.amateur.equipment:20625 rec.radio.amateur.digital.misc:12298 rec.radio.amateur.antenna:16595


The AmSoft web page "http://hamster.business.uwo.ca/~amsoft/" has
been reworked.  It is now the Mother of all WWW sites for Amateur
Radio.  Connect to over 125 ham sites direct from the front page.
New HTML work includes online forms, plenty of  color and lots of
FUN!  It could be addicting using our page.





From [e-mail] Tue Oct 17 16:13:51 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!relay-4.mail.demon.net
From: Michael J Wooding <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF Communications Magazine
Date: Sat, 14 Oct 1995 16:23:15 GMT
Organization: None
Lines: 29
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: relay-4.mail.demon.net
X-Broken-Date: Saturday, Oct 14, 1995 16.23.15
X-Newsreader: Newswin Alpha 0.7

Hi There,

To all subscribers issue 3/1995 of VHF Communications magazine will be shipped Monday Oct. 9th.
We apologise for the slight delay, but as they say in the best circles, this was due to
circumstances beyond our control - in fact our printing house had a major machine failure.

To anyone who is not a subscriber to the magazine, it is a publication for the Radio Amateur
Worldwide, especially covering VHF, UHF and Microwaves.  95% of the contents are construction
projects with a full backup with PCB's and/or kits.  The worldwide subscription rate is UKP15.00
by cheque or UKP15.75 by credit card or bank transfer.

To whet your appetite the contents of the latest issue include:

A Frequency Counter with Harmonic Mixing
200mW GaAsFET Amplifier for 24 GHz
Part-6 of a DIY Receiver for GPS and GLONASS Satellites
Linear Signal Rectification

For further information please send me an email.

Regards ... Mike
--
Michael J Wooding   [e-mail]
CompuServe: 100441,377
Tel: [phone]   Fax: [phone]
KM Publications, 5 Ware Orchard, Barby, Nr.Rugby, CV23 8UF, UK
VHF Communications Magazine - Especially Covering VHF, UHF and Microwaves



From [e-mail] Tue Oct 17 16:13:52 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!bilbo.analogic.com!not-for-mail
From: [e-mail] (Howard Cohen)
Subject: Wanted: BFO design
Message-ID: <a117cb$[e-mail]>
Date: Tue, 17 Oct 1995 13:15:19 GMT
Organization: Analogic Corporation
X-Newsreader: WinVN 0.92.6+
Lines: 8

I would appreciate it if someone could point me to a BFO design
that I could build, so that I can use my conventional sw receiver
for cw and ssb.  I have seen older designs, but they contain hard
to get, but once plentiful, components like variable capacitors.

Thank you.

Howard, n1vxs



From [e-mail] Tue Oct 17 16:13:53 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!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: Zenith Transoceanic
Date: 14 Oct 1995 21:01:48 GMT
Organization: Stanford Amateur Radio Club
Lines: 27
Message-ID: <45p8fs$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <[e-mail]> [e-mail] (Thom LaCosta) writes:
>Hello All!
>   Anyone have a diagram, etc to build a bfo unit to fit inside a
>Zenith Transoceanic ??
>    Thanks
>
>Thom LaCosta
>--
>|Fidonet:  Thom LaCosta 1:261/1352
>|Internet: [e-mail]
>|
>| Standard disclaimer: The views of this user are strictly his own.
>

I remember, as a teenager, taking an off the shelf AM wireless microphone
kit (one transistor) and adding more C to lower the frequency to 455KHz.
It worked fine as a BFO.  Just placing it close to the receiver with no
direct connection worked fine.

The problem you will have with the Transoceanic is that it tunes such a
wide frequency range over such a small dial span that the stability is
probably not there for CW or SSB reception.  It might be difficult, if not
impossible, to use the radio for that purpose.

Steve Muther (WF6R)
[e-mail]



From [e-mail] Fri Oct 20 21:28:27 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!fred.interval.com!burdick.interval.com!user
From: [e-mail] (wayne burdick)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2N7000's: important information
Date: Tue, 17 Oct 1995 21:51:23 -0800
Organization: interval research
Lines: 54
Message-ID: <[e-mail]>
NNTP-Posting-Host: burdick.interval.com

This is important reading for designers and kit builders about a component
that has recently become popular in QRP circles.  [Please publish widely.]

The 2N7000 is a DMOS MOSFET transistor that is great for switching uses:
it can be used just like an NPN transistor, but requires no current-limit
or bias resistor at the base lead (its gate lead draws no current).  In
fact, in the TO-92 package, its leads are in the same order as a bipolar
transistor:  S-G-D correspond to E-B-C.

BUT: this part *IS* subject to static damage.  Before you handle one, sit
down and touch the nearest metal surface that is grounded (rig, scope
ground lead, etc.).

Several recent club and commercial kits use 2N7000s.   Hopefully, those
who pack the kits make sure that their 2N7000 transistors are good when
they go into the anti-static bags--after that it's up to the builder.  99%
of the time, you won't have a problem even if you handle them improperly
(see story at the end of the article).  It's the 1% I'm trying to
eliminate.

This is a very useful part that won't go away, so here are some strongly
recommended guidelines:

1.  NEVER buy surplus 2N7000s or similar parts unless they are still on or
in  their protective anti-static shipping material.  Loose parts in bins
must be 100% tested before use.

2.  NEVER remove them from the shipping material until you're properly
grounded.  It is then OK to put them into anti-static bags but NOT into
ordinary plastic bags.

3.  If you suspect one is bad, you can tentatively substitute a 2N2222A or
other NPN transistor for it in many cases, BUT you must add a resistor
(typically 10K) in series with the base lead.  This is necessary because
in most circuits, the 2N7000 is driven directly by things like
microprocessor output pins, and you'll fry the NPN transistor without base
current limiting.

Now, just to confuse the issue, here's an amusing counter-example:

When I designed the 2N7000s into a recent project, I attempted to do
"destructive testing" of one of the parts.   I held a 2N7000 loosely in my
hand, scuffed my feet around on carpet, rubbed the part on my cat, shocked
myself on the sliding glass door transistor-first, and other things too
horrible to mention.  Then I put it back in the circuit.  It still
worked!  Perhaps some of the parts are better than others!  After all,
they are made by more than one manufacturer.

Hope this clarifies the use of these devices.  Assume the worst, despite
my good luck with one of them.

73,
Wayne Burdick
N6KR


From [e-mail] Fri Oct 20 21:28:28 1995
Path: news.epix.net!news.sprintlink.net!EU.net!Germany.EU.net!news.dfn.de!server2.rz.uni-leipzig.de!news.uni-jena.de!prakinf2.PrakInf.TU-Ilmenau.DE!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 40m vertical - How to make?
Date: 20 Oct 1995 08:24:47 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 15
Message-ID: <467mcf$[e-mail]>
References: <464c9a$[e-mail]> <466cmr$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>You need no
>ground whatsoever with a halfwave vertical antenna.

Don,

Sorry to say so, bot you are wrong here. it is true, that the radiation
resistance of a halfwave is higher, and hence losses induced by a poor
ground in the vincinity of the antenna (no or little radials)
is less than for a shorter antenna.

But if you look into the problem of the radiation pattern, you will find,
that it is also degraded above poor gound.

73, Moritz DL5UH



From [e-mail] Fri Oct 20 21:28:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!eastnews1.East.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!usenet
From: Dan Mick <myers>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Anybody used Ramsey FX-440 for 9600?
Date: 19 Oct 1995 21:44:44 GMT
Organization: Sunsoft Inc., Los Angeles, Ca.
Lines: 39
Message-ID: <466gsc$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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X-URL: news:[e-mail]
Xref: news.epix.net rec.radio.amateur.digital.misc:12331 rec.radio.amateur.homebrew:11209

[e-mail] (Lyle Kraft) wrote:
>Jeffrey Austen ([e-mail]) wrote:
>: > In Article <[e-mail]>, [e-mail] (James D. Cronin) wrote:
>       <stuff deleted>
>: >
>: > The transmitter was a
>: > disaster!  Because they have no shielding anywhere in the radio the
>: > transmitter output got back into the PLL and the resultant signal resembled
>: > broadband noise.  I wasted a lot of time trying to clean that up and never
>: > was successful.  I believe that  taking the time to build a good shield
>: > around the PLL would have solved the problem but there are problems with
>: > the board layout that make it a  difficult thing to do.
>
>       I found exactly the same problem.  The VCO radiation is so strong
>       that it affected the operation of the PLL.  It created reference spurs
>       on either side of the VCO out past 200kHz.  I was able to fabricate
>       a shield over the VCO, including the PC inductor,  that reduced the
>       spurs to an acceptable level.

I'm curious how the VCO radiation is affecting the operation of the
PLL.  Certainly the reference spurs are expected as a result of leakthrough
in the loop filter; are the spurs much higher than you expect?  Did you
check the loop filter to make sure it was working correctly?

>       The receiver has very little front end selectivity,  and I was plagued
>       with pager intermod.  I was able to replace the front end "tuned"
>       circuit with a Toko two-section helical filter.  Now I don't have
>       the intermod problem,  and the sensitivity seems about the same
>       (not measured but using off the air signals).

Yeah, there's apparently way too much gain in the front end
with way too little selectivity.  I'm surprised it works as
well as it does.

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



From [e-mail] Fri Oct 20 21:28:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uunet!in1.uu.net!newshub1.wanet.net!ucsnews!newshub.sdsu.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: BFO for TransOceanic
Date: 18 Oct 95 15:24:22 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Michael Blacks suggestions are top notch.  He reminded me of something I did in
a similar fashion.  When I was 15 and learning electronics, I used to cause
interference in my AM table radio with my pocket AM radio.  If the IF of the
Trans Oceanic is in the 1400 to 1600 KHZ region which is the other IF used by
short wave radios of the day, any pocket AM radio should be able to generate the
BFO. Just subtract 455 from the IF and that is the dial indication to use.

If the IF in the TransOceanic is 455 KHz you could also modify an AM pocket
radio by adding about 100 pF across the tuning capacitor to bring the frequency
down to where you can get 455 KHz.

I say all this because WalMart has a little AM/FM pocket Radio for $9.  You
can't build anything that cheaply unless you have all the parts in your junk
box.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Fri Oct 20 21:28:31 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!mn6.swip.net!plug.news.pipex.net!pipex!dish.news.pipex.net!pipex!iol!usenet
From: leslie ferguson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: connecting transverter to ft757.
Date: 19 Oct 1995 02:39:52 GMT
Organization: Ireland On-Line
Lines: 15
Message-ID: <464dpo$[e-mail]>
NNTP-Posting-Host: dialup-025.limerick.iol.ie

Hi
    I wonder could help me....I have just got a 10 meter to 2 meter
transverter (spectrum communications trc2-10bl).
My problem is i want to run it from my HF rig ft757 but cant find away
to stop the 100w going into the transverter from the antenna output.
There is a low level rf output at the back of the 757 but when i
disconnect the power from the pa stage there is no reading from the
low level rf output,i need this to drive the transverter.
                    Is there any way around this for the safty of the
transverter .maybe someone has done this before.

                       Thankyou  lez....EI9EJB....

PS....if you need any more info please let me know bye email.....



From [e-mail] Fri Oct 20 21:28:31 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cooling A 3-1000 Tube
Date: 18 Oct 1995 10:59:12 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <4634o0$[e-mail]>
References: <461te1$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <461te1$[e-mail]>, [e-mail] (J. Fred
Riley) writes:

>
>The main thing is to get enough air over the filament pins.  Heat can
>take the temper out of the filament contact springs and eventually the
>pin will desolder or the base will crack.
>
>
>[e-mail]

That's true, but isn't the main thing is to keep air over ALL the seals?
If not, any of the seals (including the anode) will become overstressed
and the tube will become a leaker!  If you think it's a bitch resoldering
filament pins, try to get air out of a tube!

73 Tom


From [e-mail] Fri Oct 20 21:28:32 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!ttc.com!usenet
From: Harvey Sugar <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS Article in 73
Date: 18 Oct 1995 15:47:43 GMT
Organization: TTC
Lines: 6
Message-ID: <4637iv$[e-mail]>
References: <[e-mail]> <460ebu$[e-mail]>
NNTP-Posting-Host: sugarh_pc.tcom.ttc.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]

[e-mail] (Bill Kirkland) wrote:
>It does look like an
>excellant part to be used with Rhode's article (he does mention it)
>"A High-Performance Hybrid Frequency Synthesizer"
 Where was this article published?



From [e-mail] Fri Oct 20 21:28:33 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!vivanews.vivanet.com!mulveyr
From: [e-mail] (Rich Mulvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: easy keyer circuit needed
Date: 17 Oct 1995 21:41:34 GMT
Organization: Mulvey Home Node
Lines: 24
Message-ID: <4617ue$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip172.vivanet.com
X-Newsreader: TIN [version 1.2 PL2]

[e-mail] wrote:

: >
: >
: > Surely there is an easy circuit I can build
: > to key 700 Hz tones to a speaker.
: > I want soemthing real simple to practice sending code.

: Hi Bret... the simplest thing you could do is to use a battery, a
: sonalert type of pieziolectric sounder and of course a key. These are
: usually fixed at a higher frequency than 700 Hz though.

: If you are hung up on hearing something close to 700 Hz then you might
: want to build up a simple tone generator using a 555 timer IC...
: sample circuits should be easily accessible.

   I believe the applications note that comes with the 555's at
Radio Shack include a schematic for a tone generator.

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


From [e-mail] Fri Oct 20 21:28:34 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!spool.mu.edu!usenet.eel.ufl.edu!news.interlog.com!io.org!torfree!freenet.toronto.on.ca!ab419
From: [e-mail] (Randie Kochals)
Subject: Eimac sockets & chimneys
Message-ID: <[e-mail]>
Sender: [e-mail] (Randie Kochals)
Reply-To: [e-mail] (Randie Kochals)
Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada
Date: Wed, 18 Oct 1995 03:27:19 GMT
Lines: 12


 Does anyone know a source for Eimac sockets and chimneys?
I have a project that requires a SK-630A socket and a chimney
to match (I think it's a SK-626).  Does Eimac sell to the
public?  Is Eimac still in business?  If any of you people
can point me in the right direction, it would be greatly
appreciated !

                                      Regards,
                                      Randie




From [e-mail] Fri Oct 20 21:28:35 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news-relay.eworld.com!zdc!zippo!wsdial1.gorge.net!user
From: [e-mail] (Dave Calhoun)
Subject: Heathkit CB to 10meters?
Sender: [e-mail]
Nntp-Posting-Host: 205.162.195.21
Organization: household
Message-ID: <[e-mail]>
Date: Tue, 17 Oct 1995 05:26:20 GMT
Lines: 10

I have my great grandpa's HeathKit Model MW-34 CB. It can tune variably or
by crystal. There are five slots for crystals. Four are internal and one
is an external plug. Is it possible to plug a crystal into this that would
allow me to listen on 10meters?
dave

--
Dave Calhoun          Audio Fanatic
[e-mail]       Landcruiser Fanatic
[e-mail]


From [e-mail] Fri Oct 20 21:28:36 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!world!news.kei.com!ub!galileo.cc.rochester.edu!alfalfa.pas.rochester.edu!bill
From: [e-mail] (Bill VanRemmen)
Subject: helically-wound 40m vertical
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: alfalfa.pas.rochester.edu
Organization: University of Rochester Computing Center
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Date: Fri, 20 Oct 95 15:33:41 GMT
Lines: 21

I am in the process of making a helically-wound 1/2-wave 40M dipole.  The
form is a 40-inch piece of 2-inch PVC pipe (scrap).  I wound about 135 feet
of 18-ga wire (close to 1 wavelenght) and I plan to put BIG capacitive hats
the ends.  I know these things are notoriously narrowband, so I plan to do
a bunch of fiddling with the cap-hats and the feedpoint.

Can anyone suggest a good way to feed this beast?  I am planning to
inductively couple to the center and play with the number of turns and their
spacing and position on the radiator.

Can anyone offer any words of wisdom?

--

                My opinions.  No one elses.  Get your own!
-----------------------------------------------------------------------------
Oh, I'm a sysadmin, and I'm ok.         | Bill VanRemmen, KA2WFJ
I work all night and I work all day.    | [e-mail]
I knock back Cokes, I skip my lunch,    | http://www.pas.rochester.edu/~bill
I'm glued to the VDT!                   |
-----------------------------------------------------------------------------


From [e-mail] Fri Oct 20 21:28:37 1995
Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!usenet
From: [e-mail] (dave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help Using Spectrum Analyzer
Date: 19 Oct 1995 05:31:23 GMT
Organization: BuffNET
Lines: 17
Message-ID: <464nrb$[e-mail]>
NNTP-Posting-Host: dppp8.buffnet.net
X-Newsreader: WinVN 0.92.2

Owner said it worked fine but needed a connector repair. The price was
right so off I went with 60 lbs of spectrum analyzer. Well after repairing
a connector and the 12 volt rail it appears to work fine. Lots of stuff happening
the FM BCB with a small antenna at the input.

Here is the problem.. No operation manuals. It has knobs I am sure how to
use. It has a tuning and  phase control. Switches for LO enable, Phase Lock
and Signal Identifier. How do you operate this thing (ie: center frequency) ?

It is a late sixties early seventies vintage SINGER SPA-3000 (99% solid state).
This thing will tune from 100MHz to 40 Ghz. I really would like to be able to use
it properly. Thought some of the more experienced ones could steer me in the
right direction.

Thanks ...

Daveb


From [e-mail] Fri Oct 20 21:28:38 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!news.duke.edu!godzilla.acpub.duke.edu!jimbob
From: "James P. Meyer" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help Using Spectrum Analyzer
Date: Thu, 19 Oct 1995 10:22:29 -0400
Organization: Duke University, Durham, NC, USA
Lines: 12
Message-ID: <[e-mail]>
References: <464nrb$[e-mail]>
NNTP-Posting-Host: godzilla.acpub.duke.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <464nrb$[e-mail]>

On 19 Oct 1995, dave wrote:

> It is a late sixties early seventies vintage SINGER SPA-3000

        Give Tucker a call at 800-527-4642.

        They sell used test equipment *and* manuals.  It won't be cheap
though.  You may pay more for the manual than you did for the unit!

        Jim




From [e-mail] Fri Oct 20 21:28:38 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.mathworks.com!news.ultranet.com!amber1.ultranet.com!user
From: [e-mail] (Jon Goguen)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: Help with HP hybrid ID?
Date: 17 Oct 1995 23:34:13 GMT
Organization: UltraNet Communications, Inc.
Lines: 34
Message-ID: <[e-mail]>
References: <45uvbq$[e-mail]>
NNTP-Posting-Host: amber1.ultranet.com
X-Newsreader: Value-Added NewsWatcher 2.0b22.0+
Xref: news.epix.net rec.radio.amateur.homebrew:11173 sci.electronics:156824

In article <45uvbq$[e-mail]>, [e-mail] (Jeff
Anderson) wrote:

> I recently picked up a Hewlett-Packard 6dB hybrid, but I can't find any
> information on it in my catalogs.  Can anyone help me with its
> specifications?  Its model number is:  15520C
>
Jeff,

I found the following info on the 15520*A* in the Tucker catalog:


   Freq:  45-95 MHz
   Range of return loss measurement:  0 to 40 dB.
   Loss between input and side ports: 6 dB.
   Loss between output and side ports: 6 dB.
   Minimum balance: 56 dB.
   Impedance:  75 ohms
   Maximum input power: +20 dBm
   BNC(F) connectors

I don't know what the differences are between A and C models, but there's
a good chance that they're very similar.

Good Luck,

Jon
--

Jon D.Goguen, Ph.D.

"Nothing worth knowing can be understood by the human mind." (Woody Allen)
_____________________________________________________________________



From [e-mail] Fri Oct 20 21:28:39 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP!!!!
Date: 19 Oct 1995 19:22:13 GMT
Organization: Netcom
Lines: 32
Message-ID: <4668h5$[e-mail]>
References: <45aql3$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ix-hou6-05.ix.netcom.com
X-NETCOM-Date: Thu Oct 19 12:22:13 PM PDT 1995

In <[e-mail]> [e-mail] (Ed Burress)
writes:
>
>In article <45aql3$[e-mail]> [e-mail] (Lord
Wisp) writes:
>>I am trying to built a linear for my 10 meter radio but cannot find
any
>>schematics... Can anyone help me or email me with schematics and
parts
>>lists..
>>and where to get them,,, Thanks!!!
>>
>

>Gee, no real name posted, no call sign, and aol account (not that that
>means anything) and for 10 meter (or was that 11 meter?)
>No thanks...
>I like helping folks when I can, I just kind of like to know who the
>other person is before I do....
>
>Ed Burress
>KC7GFX
>
I personally think you are being a bit paranoid, 11m linears are so
plentiful and easy to get many hams are now buying them and cleaning
them up to use on 12 and 15, sometimes even 20.  If the person is
interested in building one, he probably isn't planning on just using it
for a kicker for his CB, those are easy enough to get.

just my $.02 worth.

Sparky   KI5GY


From [e-mail] Fri Oct 20 21:28:40 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!news99.sunet.se!columba.udac.uu.se!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: IF-amplifier for 71MHz
Date: Thu, 19 Oct 1995 07:26:43 GMT
Organization: Uppsala University
Lines: 17
Message-ID: <46520s$[e-mail]>
NNTP-Posting-Host: jubjub.teknikum.uu.se
X-Newsreader: Forte Free Agent 1.0.82

Are building a receiver for 1.8GHz with IF at 71MHz. The linear IF-amp
Im using is a micro-devices 2601 with digitally adjustable
gain-control.
Problem is that when the gain is set to a low value the noise figure
gets real bad (It goes up as much as the gain goes down). When set to
maximum gain the noise is ok though. But when the gain is set to a
high value the amp. goes easily into saturation (Input 1dB compression
gets worse with the same amount that the gain goes up).

Does anyone have some suggestion how to solve the problem or know some
other better linear IF-amp with AGC-line?

Thankful for answers!

Micke




From [e-mail] Fri Oct 20 21:28:41 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!imagen!rpal.rockwell.com!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: IF-amplifier for 71MHz
Date: 19 Oct 1995 15:28:04 GMT
Organization: Stanford Amateur Radio Club
Lines: 31
Message-ID: <465qq4$[e-mail]>
References: <46520s$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <46520s$[e-mail]> [e-mail] writes:
>Are building a receiver for 1.8GHz with IF at 71MHz. The linear IF-amp
>Im using is a micro-devices 2601 with digitally adjustable
>gain-control.
>Problem is that when the gain is set to a low value the noise figure
>gets real bad (It goes up as much as the gain goes down). When set to
>maximum gain the noise is ok though. But when the gain is set to a
>high value the amp. goes easily into saturation (Input 1dB compression
>gets worse with the same amount that the gain goes up).
>
>Does anyone have some suggestion how to solve the problem or know some
>other better linear IF-amp with AGC-line?
>
>Thankful for answers!
>
>Micke
>
>
I have also found stability and noise problems with the RF Micro parts.
I have also had difficulty getting the attention of competant Applications
staff there to resolve problems.

I have not found a good alternative yet.  Currently playing with the old
Motorola MC1350 and 1490.  Philips also has some AGC IF amps and I am
trying to get samples.

Good Luck

Steve Muther  WF6R




From [e-mail] Fri Oct 20 21:28:42 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: IF-amplifier for 71MHz
Date: Thu, 19 Oct 95 16:13:17 GMT
Organization: TSE Systems
Lines: 44
Message-ID: <465tfh$[e-mail]>
References: <46520s$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <46520s$[e-mail]>,
   [e-mail] wrote:
>Are building a receiver for 1.8GHz with IF at 71MHz. The linear IF-amp
>Im using is a micro-devices 2601 with digitally adjustable
>gain-control.
>Problem is that when the gain is set to a low value the noise figure
>gets real bad (It goes up as much as the gain goes down). When set to
>maximum gain the noise is ok though. But when the gain is set to a
>high value the amp. goes easily into saturation (Input 1dB compression
>gets worse with the same amount that the gain goes up).
>
>Does anyone have some suggestion how to solve the problem or know some
>other better linear IF-amp with AGC-line?

It sounds like you have too much overall gain in the system.  It should be
set up so that you use maximum IF gain on weak signals (where a low noise
figure is important), and reduce the gain on strong signals (which will
override the additional noise).  From your description, it appears that the
gain control on this part works like a variable attenuator at the input of
a fixed-gain amplifier.  There was another recent thread in this group
talking about different IF amplifiers.

You didn't say what type of modulation the receiver is for, if it is FM you
could just let the amplifier saturate.  For linear modulations it is of
course essential to vary the gain according to signal conditions,
regardless of the dynamic range of the IF amplifier, the demodulator can
handle only a limited range.  The selective filter needs to be before
most of your IF gain so that the IF amplifier is not saturated by a
strong adjacent signal when trying to receive a weak desired signal.
Again, without knowing the details of your project I couldn't say whether
digital or analog gain control is more suitable.

If the stage that overloads first is after the IF amp, add a fixed
attenuator at the IF amplifier output so it's input attenuator can be set
up for high gain/low noise (and look for IF amplifiers that have less gain
in the first place, since you're now wasting the capability of this one).
If too much signal is reaching the IF amp in the first place, causing it to
saturate on no or weak signals at maximum gain, this means you have a
really high-gain (or very noisy) front-end which is likely to dominate the
system noise instead of the IF amplifier.

-Mike KD4QDM




From [e-mail] Fri Oct 20 21:28:43 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Johnson Ranger II Question
Date: 20 Oct 1995 08:47:26 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 22
Sender: [e-mail]
Message-ID: <4685ou$[e-mail]>
References: <466g8m$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <466g8m$[e-mail]>, James Garland
<[e-mail]> writes:

>
>My "new" Ranger II seems to work fine (about 45 watts output), but the
>power transformer seems to run awfully hot -- not too hot to hold my hand

>on, but nearly so. It's a large transformer, considering the modest power

>level of the transmitter, so I'm puzzled. I measured all the voltages and

>they seem normal, but I suppose it's possible something is drawing too
>much current that I'm not aware of. Does anyone else notice the same
>thing?  Jim W8ZR
>
>
>
Jim, You could have a shorted turn in the transformer. You can check it by
disconnecting the loads from the secondarys and seeing if it runs warm! If
it does, or if it draws more than 50 or 100 mA from the power line with no
load, you'll soon be in big trouble! I do think they run a bit warm in
normal operation, mine always did. 73 Tom


From [e-mail] Fri Oct 20 21:28:44 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!delmarva.com!udel!stimpy.eecis.udel.edu!hanavin
From: [e-mail] (Chuck Hanavin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Johnson Ranger II Question
Date: 20 Oct 1995 14:29:47 GMT
Organization: University of Delaware, Newark
Lines: 31
Message-ID: <468bor$[e-mail]>
References: <466g8m$[e-mail]> <4685ou$[e-mail]>
NNTP-Posting-Host: stimpy1.eecis.udel.edu

In article <4685ou$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:
>In article <466g8m$[e-mail]>, James Garland
><[e-mail]> writes:
>
>>
>>My "new" Ranger II seems to work fine (about 45 watts output), but the
>>power transformer seems to run awfully hot -- not too hot to hold my hand
>
>>on, but nearly so. It's a large transformer, considering the modest power
>
>>level of the transmitter, so I'm puzzled. I measured all the voltages and
>
>>they seem normal, but I suppose it's possible something is drawing too
>>much current that I'm not aware of. Does anyone else notice the same
>>thing?  Jim W8ZR
>>
>>
>>
>Jim, You could have a shorted turn in the transformer. You can check it by
>disconnecting the loads from the secondarys and seeing if it runs warm! If
>it does, or if it draws more than 50 or 100 mA from the power line with no
>load, you'll soon be in big trouble! I do think they run a bit warm in
>normal operation, mine always did. 73 Tom

Yes they normaly operate very hot, One problem is the high voltage
is on all the time (even in stand by). Also there are a fair amount
of tubes in a small cabinet. I know all the 6L6 audio amps I have,
run very hot.

Chuck (WB3FJJ)


From [e-mail] Fri Oct 20 21:28:45 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!iafrica.com!ticsa.com!cstatd.cstat.co.za!duvi!usenet
From: Stan Holmes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood on Internet?
Date: 19 Oct 1995 13:56:55 GMT
Organization: ESKOM Technology
Lines: 4
Message-ID: <465lf7$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 147.110.12.126
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 32bit)
To: [e-mail]

You can try http://www.accessnv.com/kenwood/amateur.html
I hope this will help.




From [e-mail] Fri Oct 20 21:28:46 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!Germany.EU.net!news.dfn.de!news.kfa-juelich.de!djukfa11!iff161
Organization: Forschungszentrum Juelich
Date: Thu, 19 Oct 1995 21:25:31 +01
From: Bob Mueller <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KVG Filters; Where?
Lines: 26

Path: djukfa11!news.kfa-juelich.de!news.dfn.de!scsing.switch.ch!
 swidir.switch.ch!in2p3.fr!oleane!simtel!harbinger.cc.monash.edu.au!bunyip.cc.uq
.oz.au!news

I've been told that KVG has dropped the business for these filters.  One
can get special order filters, in massive (for homebrewers) quantities.
Hope for something on the used market, but these are now scarce
because they are irreplaceable treasures.  I could find none of the model
you seek at one of the best amateur fleamarkets in Germany.
                                              Bob






<
<My USA parts supplier info is a bit dated now, so can someone please
<provide me with a current supplier of KVG xtal filters. I'm looking
<or the XF-9B together with BFO xtals - prefer USA based, but of course
<f there is a VK distributor then that would be better!

<3 Ted VK1BL

<[e-mail]



From [e-mail] Fri Oct 20 21:28:47 1995
Path: news.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!news
From: ted <ted>
Newsgroups: rec.radio.amateur.homebrew
Subject: KVG Xtal Filters - where?
Date: 18 Oct 1995 21:42:20 GMT
Organization: University of Queensland
Lines: 9
Message-ID: <463sbs$[e-mail]>
NNTP-Posting-Host: t7.dialup.peg.apc.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; Linux 1.0 i486)
X-URL: news:rec.radio.amateur.homebrew

My USA parts supplier info is a bit dated now, so can someone please
provide me with a current supplier of KVG xtal filters. I'm looking
for the XF-9B together with BFO xtals - prefer USA based, but of course
if there is a VK distributor then that would be better!

73 Ted VK1BL

[e-mail]



From [e-mail] Fri Oct 20 21:28:48 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ae517
From: [e-mail] (Russ Renaud)
Subject: Re: Ladder Line .. how to make?
Message-ID: <[e-mail]>
Sender: [e-mail] (Russ Renaud)
Reply-To: [e-mail] (Russ Renaud)
Organization: The National Capital FreeNet
References: <[e-mail]> <[e-mail]>
Date: Tue, 17 Oct 1995 12:06:22 GMT
Lines: 16


Drew Diamond ([e-mail]) writes:
>>Hello from down under,
>>I am looking for any clues on making ladder line (approx 450 ohms or
>>thereabouts). What do you use for spreaders, how do you fix them to the line
>>etc etc.    Thanks, Ron.  VK1NRC.
>
> Obtain some plain copper wire (not insulated), about # 14 gauge (try
> non-ferrous metal merchants). Measure out a pair, of required length. No kinks.

Why not insulated, other than it's harder to detect breaks?
I prefer to use insulated for both feedlines and antennas;
less corrosion and rain static.

Russ, va3rr/aa8lu



From [e-mail] Fri Oct 20 21:28:48 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!EU.net!sun4nl!baan.nl!fdboer
From: [e-mail] (Feico de Boer)
Subject: Looking for 144/430 MHz tranceiver schematics
Sender: [e-mail]
Message-ID: <[e-mail]>
Date: Fri, 20 Oct 1995 07:47:48 GMT
X-Nntp-Posting-Host: aar.baan.nl
Organization: Baan Europe B.V., Porting and Benchmarking Centre
X-Newsreader: TIN [version 1.2 PL2]
Lines: 15

Hello world,

I am looking for schatic drawings for a 144 and/or 430 MHz FM tranciever.
My goal is to use it mainly for local connections and >2400 baud packet
radio.

Please show me some pointers to FTP/WWW sites.

73's

Feico, PE1OHM

--

 [my employer only sponsors the bandwidth, not my opinions]


From [e-mail] Fri Oct 20 21:28:49 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!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: Looking for PIN switch
Date: 18 Oct 1995 19:02:54 GMT
Organization: Stanford Amateur Radio Club
Lines: 19
Distribution: world
Message-ID: <463j0u$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu


I am building an 8 to 12GHz sweep generator using a
surplus YIG oscillator.  I am looking for a SPDT PIN
switch module which will work in this frequency range
to implement RF blanking on retrace.

I am looing for something with about 1dB ON insertion loss
and about 50dB of OFF isolation.

If anyone has a module like this laying around, I have
other microwave hardware/parts I can trade.

Thanks

Steve Muther
WF6R  [e-mail]





From [e-mail] Fri Oct 20 21:28:50 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!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: Looking for PIN switch
Date: 19 Oct 1995 15:19:37 GMT
Organization: Stanford Amateur Radio Club
Lines: 29
Distribution: world
Message-ID: <465qa9$[e-mail]>
References: <463j0u$[e-mail]> <4644ug$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <4644ug$[e-mail]> [e-mail] (Donald J. Miller) writes:
>Steve Muther ([e-mail]) wrote:
>
>: I am building an 8 to 12GHz sweep generator using a
>: surplus YIG oscillator.  I am looking for a SPDT PIN
>: switch module which will work in this frequency range
>: to implement RF blanking on retrace.
>
>I don't know what kind of test system you have planned, but if it
>is something like a diode detector going into an oscilloscope, it
>would be easier to put your blanking pulse into the Z axis of the scope
>and blank *it*.
>
>Later,
>
>
>
>--
>-------------------------------------------------
>Don Miller         My opinions are my own!
>[e-mail]
>-------------------------------------------------

I am going to be using the sweeper with an old HP8410B Network Analyzer.
It seems to behave much better with RF blanking than with trace blanking.

Steve M. WF6R




From [e-mail] Fri Oct 20 21:28:51 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More on Power Supply Repairs
Date: 19 Oct 1995 01:22:19 GMT
Organization: SRC
Lines: 22
Message-ID: <46498u$[e-mail]>
References: <[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]

Well Ray,
         The 723 will oscillate IF you have not bypassed it correctly.
And Yes, almost all the power supplies from cheap sources have the
potential to go nuts!  (I've fixed a bunch myself!) But...

Lambda does a good job with that regulator.
Also, it's a peach with power FETs, with that gate protection zener
already built in!  And for a 60's chip, not bad!  (Seeing that power
FETS didn't get designed or built 'til the 80's)

I've built 100+ amp regulated supplies with Power FETS and the 723,
for REPEATER duty where the RF was intense!

Power FETS are the WORST for making BIG signals from the low level
oscillations of a 723, so you need to pay attention to the voltage
and current comparitor inputs.

All in all, I'll gladly take all the 723 you don't want. :)

Tom
WA1RHP



From [e-mail] Fri Oct 20 21:28:52 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More on Power Supply Repairs
Date: 19 Oct 1995 01:23:35 GMT
Organization: SRC
Lines: 22
Message-ID: <4649ba$[e-mail]>
References: <[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]

Well Ray,
         The 723 will oscillate IF you have not bypassed it correctly.
And Yes, almost all the power supplies from cheap sources have the
potential to go nuts!  (I've fixed a bunch myself!) But...

Lambda does a good job with that regulator.
Also, it's a peach with power FETs, with that gate protection zener
already built in!  And for a 60's chip, not bad!  (Seeing that power
FETS didn't get designed or built 'til the 80's)

I've built 100+ amp regulated supplies with Power FETS and the 723,
for REPEATER duty where the RF was intense!

Power FETS are the WORST for making BIG signals from the low level
oscillations of a 723, so you need to pay attention to the voltage
and current comparitor inputs.

All in all, I'll gladly take all the 723 you don't want. :)

Tom
WA1RHP



From [e-mail] Fri Oct 20 21:28:53 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: October QEX
Date: 20 Oct 1995 13:32:55 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 2
Distribution: world
Message-ID: <4688e7$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

October QEX is on the way.  Hang in there. Hi!



From [e-mail] Fri Oct 20 21:28:54 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!lade.news.pipex.net!pipex!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!ncar!noao!news.eas.asu.edu!news.asu.edu!rutledge
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 20 Oct 1995 00:48:34 GMT
Organization: Arizona State University
Lines: 20
Message-ID: <466rl2$[e-mail]>
References: <[e-mail]> <461qql$[e-mail]>
NNTP-Posting-Host: general3.asu.edu
X-Newsreader: TIN [version 1.2 PL2]

: 20 years ago.  However, you don't want to operate the VCO on the transmit
: frequency because of feedback problems.

I hadn't thought of that.  Feedback from where to where though?  Could it
be eliminated with lots of shielding?

: >I'm operating the PLL/VCO at half the required frequency and running it
: >through 1 doubler stage within the radio. The doubled frequency runs
: >through a bandpass filter, spurs are not an big issue.

: That's a good architecture, but it exceeds the frequency range of the '157.

What's the best doubler design for the VHF band?

--
  _______                KB7PWD @ N7MRP.AZ.US.NOAM    [e-mail]
 (_  | |_)               html: http://enuxsa.eas.asu.edu/~rutledge/home.html
 __) | | \__________________________________________________________________
* alternative energy * electronics * robotics * Linux * Star Trek * PIC *



From [e-mail] Fri Oct 20 21:28:55 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!spcuna!news.columbia.edu!watsun.cc.columbia.edu!jbaltz
From: [e-mail] (Jerry B Altzman)
Newsgroups: rec.radio.amateur.homebrew
Subject: QEX still not here
Date: 20 Oct 1995 02:53:15 GMT
Organization: double ionizers association
Lines: 7
Message-ID: <4672ur$[e-mail]>
NNTP-Posting-Host: watsun.cc.columbia.edu

It's October 20 (almost). I still have no QEX.

Time to call Newington. Grr.

//jbaltz
jerry b. altzman   Entropy just isn't what it used to be      [phone]
[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


From [e-mail] Fri Oct 20 21:28:56 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QEX still not here
Date: 20 Oct 1995 16:16:22 GMT
Organization: American Radio Relay League
Lines: 16
Message-ID: <468i0m$[e-mail]>
References: <4672ur$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
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]

KE3ML [e-mail] (Jerry B Altzman) wrote:
>It's October 20 (almost). I still have no QEX.

It was just last week when I hurriedly looked at
the page layout for my RF column that was written
a couple months ago so it could go to the printer. I've
not seen the printed QEX yet--and its printed locally.

Guess I ought to think about my next one, I only
have one column "in the bank."

I think the editor is still trying to catch up...

Zack KH6CP/1
[e-mail]



From [e-mail] Fri Oct 20 21:28:58 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!vixen.cso.uiuc.edu!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: Ramsey FM-10A
Date: 20 Oct 1995 19:53:33 GMT
Organization: Stanford Amateur Radio Club
Lines: 30
Distribution: world
Message-ID: <468unt$[e-mail]>
References: <466erh$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <466erh$[e-mail]> [e-mail] (Nicholas Messina) writes:
>My first kit I ever built is this fm transmitter, how can I get it to
>transmit over the 300 feet radius? I would like to at least go 1mile if
>possable. I know it's not recomended to violate the fcc rules. Maybe
>someone can give me instructions on how I can adjust and regulate the
>transmition range with some kind of modification. In other words, how  &
>where can I put a Knob to make it go
>1 mile and then turn it down to 300 feet? Adjustablity is what I need.
>
>
>
>-
>  NICHOLAS MESSINA  [e-mail]
>
>
You are quite right, it is not a good idea to violate the FCC rules.
You should investigate FCC rules part 15 before making changes to
your FM10.

In general, you will need to add an additional amplifier stage to
the transmitter.  I think there is a newsgroup: alt.radio.pirate,
or something like that, where you might find more help.
I recall seeing many threads on the FM10 and the newer FM10A.
There may even be an FAQ on the device.


Steve M.
[e-mail]




From [e-mail] Fri Oct 20 21:28:59 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.orst.edu!news
From: [e-mail] (Johan Forrer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Recommendation for a good "Grid Dipper"
Date: Tue, 17 Oct 95 15:33:06 PST
Organization: University Computing Services - Oregon State University
Lines: 20
Message-ID: <461aff$[e-mail]>
NNTP-Posting-Host: frl248.frl.orst.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.9

Hi All,

I am looking for a professional quality "grid-dipper". Essentially it
should have better than average sensitivity and good operating range from
say 1 - 500 Mhz (switched ranges/coil packs are OK too). Price is not an
object (within reason of course).

This is for remotely detecting the resonance frequency of a passive
resonator - remote means a couple of inches away from the resonant
circuit which is inaccessable, though not shielded.

I would be most grateful if anyone could recommend a manufacturer/source
for such an instrument.

Much thanks,

Johan Forrer, KC7WW

([e-mail])



From [e-mail] Fri Oct 20 21:29:00 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!howland.reston.ans.net!math.ohio-state.edu!uwm.edu!msunews!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!pcies4.trl.OZ.AU!ddiamond
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Recommendation for a good "Grid Dipper"
Date: Thu, 19 Oct 1995 16:31:40
Organization: TRL
Lines: 24
Message-ID: <[e-mail]>
References: <461aff$[e-mail]>
NNTP-Posting-Host: pcies4.trl.oz.au
Keywords: dipper
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]



>I am looking for a professional quality "grid-dipper". Essentially it
>should have better than average sensitivity and good operating range from
>say 1 - 500 Mhz (switched ranges/coil packs are OK too). Price is not an
>object (within reason of course).>This is for remotely detecting the
resonance frequency of a passive >resonator - remote means a couple of inches
away from the resonant >circuit which is inaccessable, though not shielded.
>I would be most grateful if anyone could recommend a manufacturer/source
>for such an instrument.>Much thanks,>Johan Forrer,

Not the sort of thing that's easy to buy nowadays, as far as I know. Perhaps
on the second hand market you could locate one of the supurb Millen 90662-A
outfits (which from memory; used a 9002 tube, and works to only 300 MHz).

Also, try for Measurements model 59. Uses a 955 tube; 2.2 to only 420 MHz.

Have a feeling that you may have to make your own. See if you can look up ;
"The G3WPO FET Dip Oscillator Mk 2" Radio Communications April '87 p 253.
Uses a pair od dual-channel MOSFETs in a Kalliatron oscillator, but only goes
to about 200 MHz. With some work, it may do what you want.

73, Drew, VK3XU.  Telstra Research Laboratories.



From [e-mail] Fri Oct 20 21:29:02 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Remote mounting RFI ??
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Tue, 17 Oct 1995 15:06:51 GMT
Lines: 27

In article <[e-mail]> [e-mail] writes:
>
>I am wondering if RFI from the engine might play havok with the channel
>selection lines that lead into the synthesizer micro ? It was suggested
>to me that I consider some means of protection on the channel select
>lines since the micro may be vulerable to noise (other than simple
>bypass caps to ground). My dilema is in trying to keep the design as simple
>as possible with minimal parts count, I'd prefer to avoid the extra
>hardware if not essential.

It would be good practice to use a line driver and a line receiver
chip at each end of the link. Going directly to the low current
micro's pins invites noise and spike problems. A line driver/receiver
pair will source/sink enough current to offer decent immunity to
induced noise currents. Differential driver/receivers may be overkill
here, but they don't cost much more. Or you could even opticouple
with a pair of H111 chips. They're dirt cheap, and insure that any
voltage on the wires can't get to the sensitive (and expensive)
chips.

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 Oct 20 21:29:03 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!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: Silver vs. Nickel: Why?
Date: 19 Oct 1995 19:47:05 GMT
Organization: Arizona State University, Tempe, AZ (USA)
Lines: 21
Message-ID: <4669vp$[e-mail]>
References: <45jjuu$[e-mail]>
Reply-To: [e-mail] (John Ballentine)
NNTP-Posting-Host: aztec.asu.edu


In a previous article, [e-mail] (Woody Harper) says:

>article claims that the connector must be silver plated as nickel plating
>will not work. Why? I am having a devil of a time finding silver plated
>SO-239 connectors in Phoenix, but can get nickel plated for $5.00 at
>Radio Shack. The author does not explain why he feels that only silver
>will work and I have no clue. Thanks in advance for any help.
>
>--
>-------------------------------------------------------------------------------
>Home Page: http://www.primenet.com/~lager

Try Ham Radio Outlet on Camelback. They have carried the silver plated
connectors in the past. They are usually easier to solder than the
nickel plated ones. The connectors they carry are probably a better
quality than Radio Shack carries.

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


From [e-mail] Fri Oct 20 21:29:04 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.starnet.net!wupost!ukma!rsg1.er.usgs.gov!news.er.usgs.gov!stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Synthor radio
Date: Fri, 20 Oct 1995 14:27:44 GMT
Organization: Oak Ridge National Lab, Oak Ridge, TN
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: zaek25.ymd.ornl.gov
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

Will a low band Motorola Synthor Radio spread and cover between 45-55 MHZ?

Danny Britton
[e-mail]



From [e-mail] Fri Oct 20 21:29:05 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dfw.net!news.dfw.net!not-for-mail
From: [e-mail] (Thomas Lewis)
Newsgroups: rec.radio.amateur.homebrew
Subject: The Four-Way DFer in QST magazine
Date: 20 Oct 1995 09:16:49 -0500
Organization: DFWNet -- Public Internet Access
Lines: 14
Message-ID: <468b0h$[e-mail]>
NNTP-Posting-Host: dfw.net
X-Newsreader: TIN [version 1.2 PL2]

In the November issue of QST magazine is an article called "The Four-Way DFer".
This looks like a great project for anyone who is interested in radio direction
finding.  However, for about the same amount of work (and just a little more
cost), you can be operating a doppler instead.

For more information about the AB5CK Doppler, please send an e-mail message
to [e-mail].  I will be happy to provide information about PC boards,
parts, and pricing.

Tom Lewis
AB5CK Dopplers
[e-mail]
817-428-8200



From [e-mail] Fri Oct 20 21:29:06 1995
Path: news.epix.net!news.sprintlink.net!in1.uu.net!mack.rt66.com!usenet
From: [e-mail] (Kevin Ferguson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TS 520SE HALF POWER
Date: Thu, 19 Oct 1995 13:58:16 -0600 (MDT)
Organization: Engineering International Inc., Public Internet Access
Lines: 58
Message-ID: <4669vs$[e-mail]>
References: <[e-mail]>   <[e-mail]>
NNTP-Posting-Host: 192.153.24.32
X-Newsreader: Forte Free Agent v0.38

[e-mail] (James Aeschliman) wrote:


>It sounds like the heater for one of the finals blew.

Not sure about the 'S, but my '520 runs the heaters in SERIES,
therefore it's an "all or nothing"  situation on the final filiments.
(guess they did this so that inverter would not need to handle
filiment current when mobile.)

This was very bad design practice on Kenwood's part.  Positive temp co
devices (heaters) can be unstable when in series.  Also, it sacrifices
the advantage of redundancy.

BTW, by the time '520 came along, Novices were allowed 250W DC input
power.  ( this was the new rig on mkt when I was a Novice).  Pulling
one final would require adding a resistor to simulate other tubes
filiment.  And why not just load it back anyway...There never was a
reg that said your equiptment couldn't be capable of more power...Even
a single 6146 would be illeagal (90W input) if so.  My DX-60B manual
advises novices to load back it's lone '46 so as to be under the 75
limit.  Guess you would save filiment time on second final...but they
used to be pretty cheap in those days.  If someone actually did this,
please tell me why.

Back on thread:

It is possible that one tube has shorted out all or part of its
filiment, leaving it cold, and the other super hot.  You should be
able to see this without opening the PA "doghouse".

More likely a bad connection to one tube..open inductor resistor or
some such..   Loss of vacum maybe also.
Could be HV supply lost a diode as well.

If HV level is normal, then you could lift one plate cap at a time and
see which one kills it completely.  Then switch tubes and see if it
moves with the tube or not.  If not, then look at wiring, if so , then
just a bad tube.  Note: pulling one tube out will kill both, if
filiments are in series as in '520

--->    CAUTION: High Voltage!   <----

BTW '520 does NOT require matched finals.  Just don't mix '46 ,'46A or
'46B, because filiment resistance varies, and they won't "share"
filiment power equally.  But if one died, might as well do both...its
only another 30 bucks or so, but no more hassel..all those screws,
neutralizing etc....I hate to leave a weak link anyway.  Would
probably do the driver while I was in there too, as it would have
similar filiment time as finals.

I brought a basket case '520 back from the grave (prev owner had
already begun scavaging parts) so know my way around it pretty well.
e-mail me (others welcome too) if you want opinions/advice.


73  de KO0B



From [e-mail] Fri Oct 20 21:29:07 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!math.ohio-state.edu!news.cyberstore.ca!van-bc!unixg.ubc.ca!rover.ucs.ualberta.ca!news.oanet.com!dialin20.oanet.com!ve6nap
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Tube info required  8789
Date: Wed, 18 Oct 1995 17:18:48
Organization: OA Internet SLIP client
Lines: 23
Message-ID: <[e-mail]>
NNTP-Posting-Host: dialin20.oanet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

Have recently obtained an intresting tube
it looks to be a large triode for use in Grounded Grid Service
a heavy center taped filament rated at 12.6 volts
filament current requirements unkown but appear to be around 20 + amps

Would like to get more info on this tube
ie
Max plate dissipation
Max plate volts
Max plate current
Max grid current
inter element capacitance

Typical operating parameters etc.....

It seems like it should make a good  amp for 160 M thru 10 M

Thanks to all in advance

73 de ve6nap @ oanet.com
Fax - 403-434-2111




From [e-mail] Fri Oct 20 21:29:08 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.interlog.com!io.org!van-bc!unixg.ubc.ca!rover.ucs.ualberta.ca!news.oanet.com!dialin6.oanet.com!ve6nap
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: tube info required  EEV 8987
Date: Thu, 19 Oct 1995 16:35:37
Organization: OA Internet SLIP client
Lines: 34
Message-ID: <[e-mail]>
NNTP-Posting-Host: dialin6.oanet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

"oops"  got tube # wrong on last posting  my memory is not what it used to be.

Have recently obtained an intresting tube

Marked   8987

stamped Made in England

It also has a printed EE monogram (almost worn off)

It looks to be a large triode for use in Grounded Grid Service

a heavy center taped filament rated at 12.6 volts ( marked on tube envelope)
filament current requirements unkown but appear to be around 20 + amps

Would like to get more info on this tube
ie
Max plate dissipation
Max plate volts
Max plate current
Max grid current
inter element capacitance

Typical operating parameters etc.....

It seems like it should make a good  amp for 160 M thru 10 M

Thanks to all in advance

73 de ve6nap @ oanet.com
Fax - 403-434-2111





From [e-mail] Fri Oct 20 21:29:09 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.bctel.net!news.cyberstore.ca!van-bc!unixg.ubc.ca!rover.ucs.ualberta.ca!news.sas.ab.ca!freenet.edmonton.ab.ca!morganp
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: Amp design
Date: 20 Oct 1995 17:45:14 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 9
Message-ID: <468n7a$[e-mail]>
NNTP-Posting-Host: freenet.edmonton.ab.ca
X-Newsreader: TIN [version 1.2 PL2.3]

I am looking for a schematic for an amp that will boost the power of a
handheld to about 30 watts.

--
73 & ttyl     Morgan Patterson
       \\///  Internet: [e-mail]
       (o o)  Ham Radio: VE6MRP
        (_)   "Your Computer will self destruct in..5..4..3..2..1..KABOOM!!!"
----oOO-----OOo---------------------------------------------------------------


From [e-mail] Fri Oct 20 21:29:10 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!mn6.swip.net!plug.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!bt!btnet!zetnet.co.uk!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: BFO design
Date: Wed, 18 Oct 95 03:53:27 GMT
Lines: 11
Message-ID: <[e-mail]>
References: <a117cb$[e-mail]> <461qu1$[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] (Richard Karlquist) wrote:

>Simply replace the variable capacitors with varactor diodes
>such as Motorola MV1401, MVAM109, etc.

How do you attach the knob to the diode?   :)

73,

Jack  WB3U


From [e-mail] Fri Oct 20 21:29:10 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!chsun!hslrswi!news
From: Trummer Egon <[e-mail]>
Subject: Wanted: tube specs for 6146B/W
X-Nntp-Posting-Host: bolero.hasler.ascom.ch
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
Sender: [e-mail]
Content-Transfer-Encoding: 7bit
Organization: Ascom Hasler AG, Berne, Switzerland
Mime-Version: 1.0
Date: Tue, 17 Oct 1995 15:10:14 GMT
X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.4 sun4m)
X-Url: news: rec.radio.amateur.homebrew
Lines: 13
Xref: news.epix.net rec.radio.amateur.homebrew:11174 rec.radio.amateur.equipment:20634

Hi,
I have a Kenwood TS-830 shortwave TRX. This rig has two 6146B
as final tubes. But from another OM I got two 6146W from
GEC (General Electric Canada) instead.
Nobody of our amateur radio clubs could tell me the difference
between the B and the W suffix and if I could replace them
or not. Could you give me any hints ?


Greetings from Switzerland
email: [e-mail]
call: HB9HVI, Egon



From [e-mail] Fri Oct 20 21:29:11 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Wanted: tube specs for 6146B/W
Date: Wed, 18 Oct 95 06:11:54 GMT
Lines: 12
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>Nobody of our amateur radio clubs could tell me the difference
>between the B and the W suffix and if I could replace them
>or not. Could you give me any hints ?

The 6146W is a ruggedized version of the 6146A and carries a plate
dissipation rating of 25 watts.  The 6146B, which is what you want
in the Kenwood, carries a dissipation rating of 35 watts.

73,

Jack  WB3U


From [e-mail] Fri Oct 20 21:29:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!usenet
From: James Garland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Wanted: tube specs for 6146B/W
Date: 18 Oct 1995 21:42:44 GMT
Organization: The Ohio State University
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As I recall, the 6146B should not be used in circuits intended for the
6146 or 6146A. In addition to having higher plate dissipation, the 6146B
requires a higher screen voltage to obtain the same operating point.
Therefore, if a 6146B is plugged into, e.g., a Viking Ranger, it won't
have enough screen voltage to maintain the same power output as a 6146/A.
At least that's what I recall from years ago when the 6146B was first
released. Someone pse tell me if I"m wrong!

Jim W8ZR



From [e-mail] Fri Oct 20 21:29:13 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!btnet!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!csulb.edu!nic-nac.CSU.net!VAX.SONOMA.EDU!harrisok
From: Ken Harrison <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Wanted: tube specs for 6146B/W
Date: Wed, 18 Oct 1995 23:43:17 PDT
Organization: Information Resources and Technology
Lines: 44
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On 18 Oct 1995, James Garland wrote:

> As I recall, the 6146B should not be used in circuits intended for the
> 6146 or 6146A. In addition to having higher plate dissipation, the 6146B
> requires a higher screen voltage to obtain the same operating point.
> Therefore, if a 6146B is plugged into, e.g., a Viking Ranger, it won't
> have enough screen voltage to maintain the same power output as a 6146/A.
> At least that's what I recall from years ago when the 6146B was first
> released. Someone pse tell me if I"m wrong!
>
> Jim W8ZR

Hi Jim.  Well, as I check one of my ARRL Handbooks for the specs...

Max. Ratings            6146 /A         6146B

Plate Dissipation (W):  25              35
Plate Voltage:          750             750
Screen Diss. (W):       3               3
Screen Voltage:         250             250
Freq. MHz. full rating: 60              60
Cathode Volts:          6.3             6.3
Cathode Amps:           1.25            1.125
Capacitance Cin pF:     13              13
            Cgp pF:     0.24            0.22
            Cout pF:    8.5             8.5

These look like they would be close enough that *I* would substitute.
Of course, I haven't listed performance.  I'm not sure about that part.
I also don't have the specs for the 6146W.  I know that it has a higher
plate dissipation, yet.  I believe it was developed for the military.
I don't think I'd have a problem with the W model, either.

73,
Ken


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






From [e-mail] Fri Oct 20 21:29:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!usenet
From: James Garland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Wanted: tube specs for 6146B/W
Date: 19 Oct 1995 15:45:21 GMT
Organization: The Ohio State University
Lines: 16
Message-ID: <465rqh$[e-mail]>
References: <[e-mail]> <[e-mail]> <46310r$[e-mail]> <463sck$[e-mail]> <[e-mail]>
NNTP-Posting-Host: maps1.mps.ohio-state.edu
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I, too, checked out the Handbook specs on the 6146B vs. 6146A and noted
that the only substantive difference listed was the plate dissipation.
However, I don't have the transfer characteristics for each tube, but I
still think they're not completely compatible. I THINK that a 6146B which
is plugged into a socket for a 6146A will show lower output power (and
plate current) unless the screen voltage is increased.

Re the 6146W: Last night I substituted a 6146W for the 6146A in my Viking
Ranger II, and the two tubes matched exactly: same grid and plate
current, and identical power output. THe "W" version seemed somewhat
ruggedized in its mechanical construction, which is consistent with the
notion that it's a military version of the 6146A. Unfortunately, I didn't
have a 6146B to try the same experiment.

Jim W8ZR



From [e-mail] Fri Oct 20 21:29:16 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!csulb.edu!nic-nac.CSU.net!VAX.SONOMA.EDU!harrisok
From: Ken Harrison <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Wanted: tube specs for 6146B/W
Date: Thu, 19 Oct 1995 17:20:21 PDT
Organization: Information Resources and Technology
Lines: 31
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <46310r$[e-mail]> <463sck$[e-mail]> <[e-mail]> <465rqh$[e-mail]>
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Xref: news.epix.net rec.radio.amateur.homebrew:11206 rec.radio.amateur.equipment:20690

On 19 Oct 1995, James Garland wrote:

> I THINK that a 6146B which
> is plugged into a socket for a 6146A will show lower output power (and
> plate current) unless the screen voltage is increased.

I checked with someone else who is more knowledgeable in tubes than I and
he said that this could very well be the case.  He also pointed out the
differences on an s-meter between some slightly different power outputs...

I still think if push came to shove, I'd just plug it in and go for it.

> Re the 6146W: Last night I substituted a 6146W for the 6146A in my Viking
> Ranger II, and the two tubes matched exactly: same grid and plate
> current, and identical power output. THe "W" version seemed somewhat
> ruggedized in its mechanical construction, which is consistent with the
> notion that it's a military version of the 6146A. Unfortunately, I didn't
> have a 6146B to try the same experiment.

Empirical data...  When all the speculation flies out the window!  ;-)

73,
Ken

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






From [e-mail] Fri Oct 20 21:29:17 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Wanted: tube specs for 6146B/W
Date: Fri, 20 Oct 95 19:46:40 GMT
Lines: 14
Message-ID: <[e-mail]>
References: <463sck$[e-mail]> <[e-mail]> <465rqh$[e-mail]> <[e-mail]>
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   [e-mail] (Pete Rossi) wrote:

>6146W is simply a [mechanical] ruggedized version of the plain 6146.
>Intended for stuff like mobile operation, etc.

Thanks for confirming that.  The bottom line then is that using the
6146, 6146A or 6146W in a rig designed for 6146B's is probably OK,
so long as the operator bears in mind that power may have to be
reduced in order to care for the tubes.

73,

Jack  WB3U


From [e-mail] Fri Oct 20 21:29:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!slay
From: [e-mail] (Sandy Lynch)
Subject: Re: Yaesu CAT-Interface
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL2]
References: <465k2g$[e-mail]>
Date: Fri, 20 Oct 1995 23:30:27 GMT
Lines: 79
Sender: [e-mail]

Karl-Heinz Protzer ([e-mail]) wrote:

: Are there somewhere on the net instructions to build a line interface between a
: Yaesu transceiver CAT and the RS232 of a Computer? Would be best with layouts
: as postscript or somthing like that.

Well ....... here's something I pulled off of packet not too long ago.
Use at your own risk, since I have not tried to put this one together.
73 de Sandy  WA6BXH    [e-mail]


---------------------
=============================================================
      Date: 13 May 95 03:38
      From: KB2LJJ@KB2LJJ
   Subject: INTERFACE FOR YAESU CAT
-------------------------------------------------------------

To  : YAESU@USBBS


                                 YAESU CIRCUT CAT
                                      by
                                    CT1FKP


 YAESU CAT SYSTEM for RS-232  computer COM Port.

 DB25S (Computer)                              DIN6 (Radio,cat)

                             | /-----------------       3 SI
  2 TD      -----/////-------|<
                  10K        | \   NPN 2N2484
                                V
                                |
                                |
                              __|__

  7 GND     -------------------------------------       1 GND


  3 RD      ----------------\ |
                  |          >|------//////------       2 SO
  4 RTS  _        |         / |       10K
  5 CTS  _|       |        V
                  |        |    NPN 2N2484
                  /      __|__
                  /
                  / 10K
                  /
  6 DSR _         |
  8 CD  _|________|
 20 DTR _|

You can make this circuit in side of the RS-232 DB25 pins.
This interface is compatible with the software CAT for the YAESU radios.
This is a tested circuit and works fine on FT-840.
It's possible that the circuit works on different radios.....

Transcription for English by John KB2LJJ
From: [e-mail]



Isto pode ser feito dentro da propria ficha de 25 pinos.
Esta interface e compativel com o software CAT para os radios Yaesu.
O esquema acima foi exprimentado no FT-840 e trabalhou,o software de
controlo total (ou quase) do radio e'que ainda n^Do fiz,brevemente
logo tentarei fazer.
E bem possivel que esta interface funcione com outros radios da
yaesu com CAT.

 73s'
 Rui

Packet:[e-mail]





From [e-mail] Fri Oct 20 21:29:19 1995
Path: news.epix.net!smackay
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Yaesu CAT-Interface
Date: 21 Oct 1995 00:41:23 GMT
Organization: epix.net
Lines: 84
Message-ID: <469fjj$[e-mail]>
References: <465k2g$[e-mail]> <[e-mail]>
NNTP-Posting-Host: mango.epix.net
X-Newsreader: TIN [version 1.2 PL2]

There is one in the 95 ARRL Handbook
73, W7GSM


Sandy Lynch ([e-mail]) wrote:
: Karl-Heinz Protzer ([e-mail]) wrote:

: : Are there somewhere on the net instructions to build a line interface between a
: : Yaesu transceiver CAT and the RS232 of a Computer? Would be best with layouts
: : as postscript or somthing like that.

: Well ....... here's something I pulled off of packet not too long ago.
: Use at your own risk, since I have not tried to put this one together.
: 73 de Sandy  WA6BXH    [e-mail]


: ---------------------
: =============================================================
:       Date: 13 May 95 03:38
:       From: KB2LJJ@KB2LJJ
:    Subject: INTERFACE FOR YAESU CAT
: -------------------------------------------------------------

: To  : YAESU@USBBS

:
:                                  YAESU CIRCUT CAT
:                                       by
:                                     CT1FKP


:  YAESU CAT SYSTEM for RS-232  computer COM Port.

:  DB25S (Computer)                              DIN6 (Radio,cat)

:                              | /-----------------       3 SI
:   2 TD      -----/////-------|<
:                   10K        | \   NPN 2N2484
:                                 V
:                                 |
:                                 |
:                               __|__

:   7 GND     -------------------------------------       1 GND

:
:   3 RD      ----------------\ |
:                   |          >|------//////------       2 SO
:   4 RTS  _        |         / |       10K
:   5 CTS  _|       |        V
:                   |        |    NPN 2N2484
:                   /      __|__
:                   /
:                   / 10K
:                   /
:   6 DSR _         |
:   8 CD  _|________|
:  20 DTR _|

: You can make this circuit in side of the RS-232 DB25 pins.
: This interface is compatible with the software CAT for the YAESU radios.
: This is a tested circuit and works fine on FT-840.
: It's possible that the circuit works on different radios.....
:
: Transcription for English by John KB2LJJ
: From: [e-mail]



: Isto pode ser feito dentro da propria ficha de 25 pinos.
: Esta interface e compativel com o software CAT para os radios Yaesu.
: O esquema acima foi exprimentado no FT-840 e trabalhou,o software de
: controlo total (ou quase) do radio e'que ainda n^Do fiz,brevemente
: logo tentarei fazer.
: E bem possivel que esta interface funcione com outros radios da
: yaesu com CAT.

:  73s'
:  Rui

: Packet:[e-mail]
:




From [e-mail] Fri Oct 27 12:34:38 1995
Path: news.epix.net!usenet
From: [e-mail]
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: !!! Over 400 WWW Ham Sites !!!
Date: Thu, 26 Oct 95 21:09:14 PDT
Organization: epix.net
Lines: 5
Message-ID: <NEWTNews.814767294.12034.amsoft@486dx4_120>
NNTP-Posting-Host: lwbyppp84.epix.net
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Try the URL http://hamster.business.uwo.ca/~amsoft  And link to over
400 WWW sites from the Home Page. All Amateur Radio / Communications
related URL's !  This is the Mother of all Ham Radio Link Pages.



From [e-mail] Fri Oct 27 12:34:39 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!intex.net!Intex
From: [e-mail] (Elizabeth Norsworthy)
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: !!! Over 400 WWW Ham Sites !!!
Date: Fri, 27 Oct 95 16:16:19 GMT
Organization: intex
Lines: 21
Message-ID: <46r0kj$[e-mail]>
References: <NEWTNews.814767294.12034.amsoft@486dx4_120>
NNTP-Posting-Host: dialupa59.intex.net
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.radio.swap:49887 rec.radio.shortwave:65334 rec.radio.scanner:40027 rec.radio.amateur.space:5557 rec.radio.amateur.policy:31616 rec.radio.amateur.misc:93619 rec.radio.amateur.homebrew:11309 rec.radio.amateur.equipment:20906 rec.radio.amateur.digital.misc:12405 rec.radio.amateur.antenna:16754

In article <NEWTNews.814767294.12034.amsoft@486dx4_120>,
   [e-mail] wrote:
>
>Try the URL http://hamster.business.uwo.ca/~amsoft  And link to over

 Thanks for the link! :)

 LIz N.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Intex.net The Business Community's Internet Provider [phone]
Elizabeth & John Norsworthy visiting you from Dallas, Tx. via Intex.net
Visit us at: http://www.intex.net/hour_house/hour_house.html
Hour House (Midnight Angel) BBS [phone]
J&E Computer Services [phone]
Internet: [e-mail]
America OnLine: NorsworthE
CompuServe: 102116,3314
FidoNet: 1:124/9023
MSNetwork: [e-mail]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


From [e-mail] Fri Oct 27 12:34:40 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!news.encore.com!psoper
From: [e-mail] (Pete Soper)
Subject: Re: '95 Handbook problem (problem solved)
Organization: Encore Computer Corporation
Date: Tue, 24 Oct 1995 14:56:36 GMT
Message-ID: <[e-mail]>
References: <[e-mail]>
Sender: [e-mail] (Usenet News)
Nntp-Posting-Host: sysgem1.encore.com
Lines: 42

Yesterday I wrote about a problem with making a program for low pass
filter design. I thought there was an error in one of the equations I
based the program on. Email from [e-mail]
indicates the Handbook equations came from "ITT Handbook", page 10-3,
6th ed 1975 and are accurately copied in the ARRL Handbook. This
gentleperson also had no problem with the example values using "Mathcad"
except that the calculated values don't actually match the Handbook example
(but they are close). My results for all but R1 matched SABIN's exactly.

But here's what the problem is. Some of you folks familiar with floating
point implementations on computers may get a chuckle out of this.

The subexpression with the problem looks like this:

   sqrt( ( X * C2 ^2 ) - Y )

That is, the square root of X times C2 squared minus Y. The squaring of
C2 is done by multiplying it by itself, not with a power function. This gave
me a domain error because a negative value was being presented to the
computer's square root function. After reading SABIN's mail, I went back
for one more look at my program and by chance futzing rewrote the expression
like this:

    sqrt( ( X * C2 * C2) - Y )

This works! You readers used to perfect math implementations might be pretty
annoyed to find that "X * (C2*C2)" is not the same as "X * C2 * C2" on a
computer. But the float hardware I'm using does produce a *very very small*
difference in results. This tiny difference means that in the OK
case the product comes out to the same value as Y and so the square root gets a
zero argument. In the failing case it gets a very, very small negative value as
an argument because the product is larger than Y.

So no need to bother the ARRL about this one and I can get on with what it was
I was doing to start with.

Regards,
Pete

------------------------------------------------------------------------------
Pete Soper  ([e-mail])    KS4XG        1+ 919 481 3730,  481 3868/FAX
Encore Computer Corp  901 Kildaire Farm Rd  Cary, NC 27511  USA    grid FM05oq


From [e-mail] Fri Oct 27 12:34:41 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.encore.com!psoper
From: [e-mail] (Pete Soper)
Subject: '95 Handbook problem, need email or phone reference
Organization: Encore Computer Corporation
Date: Mon, 23 Oct 1995 21:06:12 GMT
Message-ID: <[e-mail]>
Sender: [e-mail] (Usenet News)
Nntp-Posting-Host: sysgem1.encore.com
Lines: 23

Hi folks,
        I've plugged a lot of numbers into the R1 resistor equation of
the low-pass active filter design description in figure 16.54 on page
16.30 of the '95 "ARRL Handbook". I'm convinced that either the
equation is in error or I've lost my mind. In case it's the former problem
(or to get quickly to the latter), could somebody recommend how I can pursue
this with the ARRL? Is there a department to ask for on the phone (#?)
or an email address for this kind of query?
        Please send me email direct if you can help, as postings to this
group are averaging 7-12 days to ooze through our news feed.
        My problem is that the "[a^2 + 4b(K-1)]C2^2" subexpression results
in an attempt to take the square root of a negative value because this comes
out smaller than the "4bC1C2" subexpression subtracted from it. If I guess
that parentheses are missing and it should be written "([a^2 + 4b(K-1)]C2)^2"
I get the wrong result for the example values given. I can't come up with
a second guess :-)

Thanks,
Pete

------------------------------------------------------------------------------
Pete Soper  ([e-mail])    KS4XG        1+ 919 481 3730,  481 3868/FAX
Encore Computer Corp  901 Kildaire Farm Rd  Cary, NC 27511  USA    grid FM05oq


From [e-mail] Fri Oct 27 12:34:42 1995
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!cornellcs!travelers.mail.cornell.edu!news.kei.com!simtel!news.net99.net!news.igc.net!discovery.igc.net!blackout
From: Blackout <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: -=-=-Blackout's Box-=-=-
Date: Wed, 25 Oct 1995 02:24:10 -0400
Organization: Internet Gateway Connections
Lines: 12
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: discovery.igc.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>


Well...

I have a bad day when other people get annoying. And you can see
that that guy annoyed me.  Maybe I did overreact just a little bit.

Just a tad.

But I'm an actor.  That's what I do.

Blackout



From [e-mail] Fri Oct 27 12:34:43 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: 40m vertical - How to make?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <464c9a$[e-mail]> <466cmr$[e-mail]> <467mcf$[e-mail]>
Date: Sat, 21 Oct 1995 14:01:44 GMT
Lines: 29

In article <467mcf$[e-mail]> [e-mail] () writes:
>>You need no
>>ground whatsoever with a halfwave vertical antenna.
>Don,
>
>Sorry to say so, bot you are wrong here. it is true, that the radiation
>resistance of a halfwave is higher, and hence losses induced by a poor
>ground in the vincinity of the antenna (no or little radials)
>is less than for a shorter antenna.
>
>But if you look into the problem of the radiation pattern, you will find,
>that it is also degraded above poor gound.

Sure, lossy *Earth* near an antenna is always a problem, so keep
your antennas well away from Earth, but that doesn't address his
comment. A halfwave antenna *does not require ground* to function.
It doesn't need it to act as a current mirror the way a quarterwave
does. A halfwave vertical is perfectly content to function properly
in *free space*. A quarterwave needs some sort of counterpoise.
That counterpoise *can* be Earth, but it doesn't have to be. Radials,
or a counterpoise wire, will work just as well, probably better
since they won't be as lossy as Earth.

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 Oct 27 12:34:44 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: 40m vertical - How to make?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <464c9a$[e-mail]>
Date: Sun, 22 Oct 1995 15:33:09 GMT
Lines: 25

In article <464c9a$[e-mail]> [e-mail] (If you want my name just ask. ) writes:
>Tell me what you know about 40m verticals, I've been told that ground
>radials acutally function better above ground. I want to build the best
>40m vertical I can. What do you have to share?

This question really belongs over on the antenna group, but I'll quickly
say that tests have been done with elevated feedpoints (and elevated
radials), and while there is still some controversy, elevated systems
appear to be better. The reason they seem to be better is that they
get the high base currents up away from lossy Earth. Some tests have
shown that as few as 4 elevated radials have as low a loss as 24 in
ground radials.

You can't raise the radials without elevating the feedpoint, however.
If you don't, results will be bad. Raising the feedpoint for a 40
meter vertical isn't always mechanically simple, and raised radials
are unsightly, and can be a hazard to people walking under the
antenna. Tradeoffs.

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 Oct 27 12:34:45 1995
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 40m vertical - How to make?
Date: 26 Oct 1995 11:52:27 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
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>Raising the radiation resistance is not important to these losses, but
>lowering the total current flow into the ground is. Referring to radiation
>resistance is confusing, since the actual current loop radiation
>resistance of a 1/4 wl monopole is only a slight amount lower than the
>current loop radiation resistance of a half wave monopole, yet the base
>loop resistance and net current flow into the ground is vastly different
>between the two.


Tom,

The definition I had in mind is:
radiation resistance = total radiated power/(antenna current)^2

Acoording to a text book this is roughly:
  7 Ohms for a 1/8 wl vertical over ground
 30 Ohms  "    1/4 "    "       "    "
110 Ohms  "    1/2 "    "       "    "

Ground losses are supposed to be essentially inverse to these numbers,
so this is bad news for all the short multiband verticals
without ground plane.

73, Moritz DL5UH



From [e-mail] Fri Oct 27 12:34:46 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 40m vertical - How to make?
Date: 26 Oct 1995 11:47:18 -0400
Organization: America Online, Inc. (1-800-827-6364)
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In article <46nspr$[e-mail]>,
[e-mail] () writes:

>Tom,
>
>The definition I had in mind is:
>radiation resistance = total radiated power/(antenna current)^2
>
>Acoording to a text book this is roughly:
>  7 Ohms for a 1/8 wl vertical over ground
> 30 Ohms  "    1/4 "    "       "    "
>110 Ohms  "    1/2 "    "       "    "
>
>Ground losses are supposed to be essentially inverse to these numbers,
>so this is bad news for all the short multiband verticals
>without ground plane.
>
>73, Moritz DL5UH

That's the same definition  I had in mind Moritz. I was trying to point
out the current is taken at the current maxima, not necessarily at the
feedpoint. The net feedpoint current (all the currents, not just the ones
from the transmission line) controls the I^2*R ground losses, not the
radiation resistance. Unless the feedpoint happens to have the current
maxima at the eart connection.

Any way, wrong newsgroup...so better off to the .antenna

73 Tom


From [e-mail] Fri Oct 27 12:34:47 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!winternet.com!io.org!torfree!freenet.toronto.on.ca!ab419
From: [e-mail] (Randie Kochals)
Subject: 4CX1000 Prices?
Message-ID: <[e-mail]>
Sender: [e-mail] (Randie Kochals)
Reply-To: [e-mail] (Randie Kochals)
Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada
Date: Sun, 22 Oct 1995 03:11:28 GMT
Lines: 7


I am looking around for an Eimac 4CX1000a tube and was wondering
what the going price should be for new and used.  If any of you
have seen for sale, or have recently bought one of these, let me
know what I should be prepared to pay.

                                Thanks


From [e-mail] Fri Oct 27 12:34:48 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!castle.nando.net!news
From: Dave Hockaday <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1000 Prices?
Date: 27 Oct 1995 11:17:29 GMT
Organization: News & Observer Public Access
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>I am looking around for an Eimac 4CX1000a tube and was wondering
>what the going price should be for new and used.  If any of you
>have seen for sale, or have recently bought one of these, let me
>know what I should be prepared to pay.
>
>                                Thanks

I bought a 4cx1500 and socket to build an amp with about 2 years ago. It
was a good pull from a local station, and the engineer had the matching
twist-lock socket. I paid $150 for both. Now I have taken on several
other projects (own/maintain a bunch of repeaters) and doubt if I'll ever
get around to building the amp...you want to buy a 4cx1500 and socket?
:-)

73 de WB4IUY




From [e-mail] Fri Oct 27 12:34:49 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: 5-5.5 MHz DDS/PLL synthesizer
Message-ID: <[e-mail]>
Organization: Organization? Me?
Date: Thu, 26 Oct 1995 20:13:56 GMT
Lines: 9
Sender: [e-mail]

I'd like to build a 5.0-5.5 MHz DDS or PLL synthesizer that I can use
as an external VFO for a conventional transceiver. I recall seeing an
article in QST or somewhere in the last couple of years on such a project.
Could someone tell me where to look, and if you'be built such a thing,
how well it works?

Thanks,

73 Dave WB0GAZ [e-mail]


From [e-mail] Fri Oct 27 12:34:50 1995
Path: news.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!wormwood.demon.co.uk
From: [e-mail] (giles)
Newsgroups: rec.radio.amateur.homebrew
Subject: 50MHz transmitter frequencies for UK
Date: Mon, 23 Oct 1995 20:49:37 GMT
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: wormwood.demon.co.uk
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I have recently passed my RAE and instead of lashing out on expensive
equipment ,I am going to do some homebrew QRP projects together with
appropriate  instrumentation -- see Practical Transmitters for
Novices. What I should like to know:

1) What are best channel frequencies for FM 50MHz?  i.e. what rocks to
choose?

2) In order to hear  the 6M band I have built a converter  to connect
to my Kenwood R5000. I have tried to make a dipole but have no usable
signals yet --- i think a higher antenna is called for. Has anyone any
experience with the 50MHz to 28MHz converter a la Cirkit?


Giles G7VOF



From [e-mail] Fri Oct 27 12:34:51 1995
Path: news.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AMSOFT SPAM
Date: 23 Oct 1995 14:47:40 GMT
Organization: UniSQL, Inc.
Lines: 25
Message-ID: <46g9uc$[e-mail]>
References: NEWTNews.813970745.11764.amsoft@amsoft> <46ejd9$[e-mail]>
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X-Newsreader: NCSA Mosaic

Bob:

I stand by my previous comment: SPAM-soft.

The gentlemen (NOT) at AMSOFT wisely chose to send their message to at least
ten newsgroups on this round of their shameless advertising.  Regardless
of the value of the information they provide, their relentless SPAMMing
of the amateur radio radio newsgroups is unjustifiable and inexcusable.

There was a major SPAM attack from Amsoft the last time they had a new
CD release.  And the time before that.  AND the time before THAT!  They
have an unfortunate history for alienating a lot of us and for wasting a lot
of bandwidth.

That you would support their activity says something about you -- not sure
what, exactly.  But it's not in keeping with newsgroup's non-commercial charter.

If you are reading this, it's because I'm wasting bandwidth only on the
rec.radio.* newsgroup I read.  And if you reply to my flaming diatribe,
you will do so only to this newsgroup, unless you choose to add groups.
Of course you understand how to add and remove groups from your To:
field in your newsreader.  You DO understand how that works, don't you?

Jim N6OTQ
Standard disclaimer


From [e-mail] Fri Oct 27 12:34:52 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.scanner,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!mfogarty
From: [e-mail] (Michael Fogarty)
Subject: an HT from Hong Kong?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
Date: Sat, 21 Oct 1995 16:11:33 GMT
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Xref: news.epix.net rec.radio.amateur.equipment:20722 rec.radio.scanner:39854 rec.radio.amateur.homebrew:11232

Folks,

I'm new on the amateur radio scene and need some advice.  I'll be going
to Hong Kong soon and am interested in shopping for an HT.  What can you
advise me about:

* Brand
* available frequencies
* legalities
* costs

Even if you don't know anything about "export only" HT's or Hong Kong,
I'd appreciate your responses about Brands and costs.  I'm planning to
spend about $400-500 in HK on such a unit.

I've got friends who will guide me through the licensing process and
hook me up with the local Ham groups (Bay Area).  I intend to go legit
and certainly wouldn't want to break any laws by importing something
with extra frequencies ;-)

Imagine, though, that you could pick up anything available in the
$400-500 range.  What would you get?

Thanks,

Mike


From [e-mail] Fri Oct 27 12:34:53 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.scanner,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!IntGame!charnel.ecst.csuchico.edu!waldorf.csc.calpoly.edu!zimmer!news
From: [e-mail] (Rafael Solis)
Subject: Re: an HT from Hong Kong?
Message-ID: <[e-mail]>
Sender: [e-mail]
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Xref: news.epix.net rec.radio.amateur.equipment:20778 rec.radio.scanner:39909 rec.radio.amateur.homebrew:11263

In article <46b7s9$[e-mail]> [e-mail] (If you want my name just ask. ) writes:
>
>>to Hong Kong soon and am interested in shopping for an HT.  What can
>you
>>advise me about:
>
>
>I'd save myselft the trouble and buy from a stateside distributor, I've
>heard of guys buying overseas HF gear with features or bands not avail.
>in U.S but I've never heard of any great bargains. What you save by
>shopping Hong Kong may cost you quickly if you have a problem or need
>an accessory for the radio.
>
>I have a Kenwood Dual band HT and like it alot.
>
>73, Tim ka8ddz


I agree with Tim.  I've been to HK several times on business trips and
it is not worth the hassling of dealing with the salesmen over there
(prices are not fixed and you have to deal, yes as in bargaining!).
Also there is the problem of the warranty.  I don't think any of the
major brands (K,I,Y) honor warranties of any equipment bought
overseas.  What I have bought though are accessories.  Bring your AES
catalog to check the price differences.  Some things are cheaper there
but others are around the same or even higher depending on the store.
Another suggestion is to get away from the Nathan Rd. stores, those
are usually overpriced.

Have fun in HK.

Rafael (KE6JSR)






From [e-mail] Fri Oct 27 12:34:54 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!mn6.swip.net!plug.news.pipex.net!pipex!tank.news.pipex.net!pipex!newsfeed.internetmci.com!lamarck.sura.net!isdnlin.mtsu.edu!atlas.tntech.edu!news!jra1854
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Anybody used Ramsey FX-440 for 9600?
Message-ID: <[e-mail]>
From: [e-mail] (Jeffrey Austen)
Date: Tue, 24 Oct 95 17:58:31 GMT
References: <4332ef$[e-mail]> <[e-mail]>
 <[e-mail]> <[e-mail]> <45r705$[e-mail]>
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>>My recommendation is to avoid the unit unless they have made major design
>>changes since the original radio (the 2-m version failed the transmitter
>>spurious output test -- see the QST review from about a year ago).
>>
>>Jeff, k9ja

>Do you know which copy of qst this was in??? I'm about 95% of the way
>through builing my ramsey kit and this does not make me happy to read!
>
>mark
>n2uem

See QST, October 1993, pages 73, 74 and 80.  To be fair, after the ARRL
called Ramsey about the problem they were provided with a fix; but, to
quote the review, "The close-in spurs, even after the modification, are
fairly significant."

Jeff, k9ja
---
Jeffrey Austen       |  Tennessee Technological University
[e-mail]   |  Box 5004
[phone]      |  Cookeville Tennessee 38505   U.S.A.


From [e-mail] Fri Oct 27 12:34:55 1995
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!unknown!lkraft
From: [e-mail] (Lyle Kraft)
Subject: Re: Anybody used Ramsey FX-440 for 9600?
Sender: [e-mail] (News Administrator)
Message-ID: <[e-mail]>
Date: Thu, 26 Oct 1995 15:54:36 GMT
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In article <466gsc$[e-mail]> you wrote:

        <stuff deleted>

: > >
: > >   I found exactly the same problem.  The VCO radiation is so strong
: > >   that it affected the operation of the PLL.  It created reference spurs
: > >   on either side of the VCO out past 200kHz.  I was able to fabricate
: > >   a shield over the VCO, including the PC inductor,  that reduced the
: > >   spurs to an acceptable level.
: >
: > I'm curious how the VCO radiation is affecting the operation of the
: > PLL.  Certainly the reference spurs are expected as a result of leakthrough
: > in the loop filter; are the spurs much higher than you expect?  Did you
: > check the loop filter to make sure it was working correctly?
: >

        Well,  I would say that reference spurs of -6dBc are higher than
        expected.  If the loop filter was at fault, then shielding the
        VCO would have no affect.  As further evidence of VCO radiation,
        when I had the top cover of the unit off and had a receiver tuned
        to the VCO frequency,  I could rattle metal tools together off the
        bench up to two feet away and the VCO would produce microphonic
        responses.  And a spectrum analyzer with a "sniffer" probe would
        pick up a strong signal in the general area.

        I suspect that there's so much of this radiation being coupled into
        the PLL circuitry that it's either modulating the divided VCO signal
        going back to the PLL chip or somehow modulating the charge pump
        output, perhaps driving the filter into nonlinearity.  Whatever the
        mechanism,  it doesn't seem to be related to a bogus filter,  and
        I did fiddle around with that.

        I'd be interested in hearing other possible explanations though.


        Regards,
        L

 ==========================================================================
                             Lyle Kraft               AA6LK
 #####################       Hewlett-Packard
 ######  /_  _  ######       System Interconnect Lab -
 #####  / / /_/  #####          Information Networks Division
 ######    /    ######       Roseville, CA 95747-5601
 #####################       916-785-5798  FAX [phone]
                             [e-mail]
 ==========================================================================




From [e-mail] Fri Oct 27 12:34:56 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.rccn.net!titan.ci.ua.pt!usenet
From: "J. Silva" <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Anybody used Ramsey FX-440 for 9600?.Humm...
Date: 21 Oct 1995 11:17:40 GMT
Organization: Univ. Aveiro - Portugal
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>>Does the Ramsey FX-440 transceiver kit actually work for 9600 baud packet?
>>I have friend-of-a-friend word that Ramsey claims it works on 9600 baud
>>packet, but nobody has actually been able to get it going quite right.

Some time ago I bought their kit.  I found that the receiver suffered
from
many spurious responses which, given right (wrong?) packet frequency
would
make it pretty useless.  I did get it to receive 9600 but had a pretty
strong signal to work with and didn't make any performance measurements
so
I can't really comment on the receive performance.  The transmitter was
a
disaster!  Because they have no shielding anywhere in the radio the
transmitter output got back into the PLL and the resultant signal
resembled
broadband noise.  I wasted a lot of time trying to clean that up and
never
was successful.  I believe that  taking the time to build a good shield
around the PLL would have solved the problem but there are problems with
the board layout that make it a  difficult thing to do.  I did find a
few
minor design errors which resulted a very long (for 9600 packet) TR
turnaround time.  They directly modulate the VCO, like most radios, so
the
transmitter will distort the signal.  I never got far enough to worry
about
that.

A friend of mine bought one and had similar problems.  Both of us wasted
a
good bit of money.  Since then we have discovered the joys of converting
commercial (e.g., Motorola and GE) radios...they work!

My recommendation is to avoid the unit unless they have made major
design
changes since the original radio (the 2-m version failed the transmitter
spurious output test -- see the QST review from about a year ago).

Interessante ??? CT1DSJ




From [e-mail] Fri Oct 27 12:34:57 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!uwm.edu!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: arithmetic noise
Date: 25 Oct 1995 03:38:44 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 12
Distribution: world
Message-ID: <46kbg4$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

Dave NG0X writes:
>Here are a few rules to live by:
>1) don't test for floating point zero -- do test for a small rear zero.
>2) don't add/subtract a small number with a much larger
>etc etc
> Do brush up on your trigonometry.

The problem being discussed does not involve roundoff noise or
the rules of trigonometry, both of which are quite well understood.
The problem with X^Y apparently involved a problem with a
particular BASIC compiler or interpreter on a certain PC
which I reported to Microsoft. Thanks anyway.


From [e-mail] Fri Oct 27 12:34:59 1995
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!in1.uu.net!hodes.com!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: ATV North Country Radio?
Date: 26 Oct 1995 14:27:16 GMT
Organization: Netcom
Lines: 14
Message-ID: <46o5s4$[e-mail]>
References: <46ggnc$[e-mail]> <46i5eq$[e-mail]> <46nspr$[e-mail]>
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X-NETCOM-Date: Thu Oct 26  7:27:16 AM PDT 1995


I read a construction article last year for a 5 watt ATV tranciever
available as a kit from North Country Radio out of NY. The kit looked
very attractive and I thought the price of $179 for a 5 watt tranciever
was pretty fair. The article showed complete schem's & all but I would
be happier to get all the parts & PC board in 1 bag...

What concerns me is I have not seen them advertise in 73 or QST has
anyone built one of these or have any experience with this company?
Or any other suggestions for building ATV gear?

73,

Tim Hynde


From [e-mail] Fri Oct 27 12:35:00 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Fritz-o-matic)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Best motherboard for minimum rfi
Date: Sat, 21 Oct 1995 03:07:46 GMT
Organization: Netcom
Lines: 35
Message-ID: <469o7b$[e-mail]>
References: <[e-mail]> <[e-mail]>
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X-NETCOM-Date: Fri Oct 20  8:08:27 PM PDT 1995
X-Newsreader: Forte Agent .99b.112

On 21 Oct 95 02:19:45 GMT, [e-mail] (Paul Erickson)
wrote:

>Has anyone done any comparisons to see which motherboards are best
>from an rfi point of view?? I am planning on replacing the board in
>my old AT, but my current experiences with my NEC multispeed
>(very noisy on 14mhz) are making me cautious about computer generated
>rfi.  Any comments will be appreciated.
>
>cheers, Paul
>ve7cqk
>email: [e-mail]
>

        All computers generate RFI. The elimination of RFI is next to
impossible however it can be reduced greatly by shielding the
components of the system.
        Some computer cables are not shielded as well as they could/should be.
Keyboard cables are generally a weak point. RF chokes at both ends of
all cables as close to termination as possible will limit these
"antennae's" interference.
        The case of the computer is very important. Consider it very similar
to the case of a transmitter. Plastic or composite cases provide very
little RF shielding. An all metal case is best and make certain that
the mating surfaces are free of paint and other insulating materials.
This includes the power supply cage. Locate the case as far away from
your transceiver as possible.
        Monitors are also a prime source of RFI. Adequate shielding is
generally supplied on the sides but the other four surfaces are
lacking. Locate the monitor as far away from your transceiver as
possible and preferably on the same horizontal plane.
        Hope this helps
        73 de N4JVP/NH
        Fritz



From [e-mail] Fri Oct 27 12:35:00 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Paul Erickson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Best motherboard for minimum rfi
Date: 21 Oct 95 02:19:45 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Has anyone done any comparisons to see which motherboards are best
from an rfi point of view?? I am planning on replacing the board in
my old AT, but my current experiences with my NEC multispeed
(very noisy on 14mhz) are making me cautious about computer generated
rfi.  Any comments will be appreciated.

cheers, Paul
ve7cqk
email: [e-mail]



From [e-mail] Fri Oct 27 12:35:02 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!acara.snsnet.net!polo.iquest.com!dkelly.iquest.com!user
From: [e-mail] (David Kelly)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Best motherboard for minimum rfi
Date: Sun, 22 Oct 1995 22:04:40 -0500
Organization: N4HHE
Lines: 44
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <469o7b$[e-mail]>
NNTP-Posting-Host: 204.177.193.231

In article <469o7b$[e-mail]>, [e-mail]
(Fritz-o-matic) wrote:

>         All computers generate RFI. The elimination of RFI is next to
> impossible however it can be reduced greatly by shielding the
> components of the system.
>         Some computer cables are not shielded as well as they could/should be.
> Keyboard cables are generally a weak point. RF chokes at both ends of
> all cables as close to termination as possible will limit these
> "antennae's" interference.
>         The case of the computer is very important. Consider it very similar
> to the case of a transmitter. Plastic or composite cases provide very
> little RF shielding. An all metal case is best and make certain that
> the mating surfaces are free of paint and other insulating materials.
> This includes the power supply cage. Locate the case as far away from
> your transceiver as possible.
>         Monitors are also a prime source of RFI. Adequate shielding is
> generally supplied on the sides but the other four surfaces are
> lacking. Locate the monitor as far away from your transceiver as
> possible and preferably on the same horizontal plane.
>         Hope this helps
>         73 de N4JVP/NH
>         Fritz

The above is a very simplistic concept based on the notion that "all
computers generate RFI" and all solutions are sheilding based. This is too
simplistic to be a truth.

Metal enclosures are good.

Grounding electronics to metal enclosures is not always good as it often
couples the noise right into the enclosure and out into the world. Gotta
try it both ways to know which works best. Isolating the electronics from
the enclosure worked best for our last project that went thru FCC testing.

But no pound of cure works as well as an ounce of prevention. RFI noise
comes from circuits. Fast digital signal edges can be nasty noise makers.
A solution is to slow these edges, but this is not a solution for your
off-the-shelf PCB motherboard.
--
David Kelly N4HHE,   [e-mail],    [e-mail]
===========================================================
To invent, you need a good imagination and a pile of junk.
                -- Thomas Edison


From [e-mail] Fri Oct 27 12:35:03 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!lamarck.sura.net!news.cc.ucf.edu!usenet
From: dean@slinkyworld (dean)
Newsgroups: rec.radio.amateur.homebrew
Subject: Circuit diagram for a 100+ ft  transmitter and receiver
Date: 23 Oct 1995 20:35:33 GMT
Organization: University of Central Florida
Lines: 10
Message-ID: <46gual$[e-mail]>
NNTP-Posting-Host: 132.170.21.108
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

Does anyone know where I could find a circuit diagram for a transmitter and
receiver that could go 100+ feet. One or two channel.

I would like to build one from scratch.


Thanks in advance

[e-mail]



From [e-mail] Fri Oct 27 12:35:04 1995
Path: news.epix.net!news.sprintlink.net!news.wwa.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cooling A 3-1000 Tube
Date: 22 Oct 1995 21:21:01 GMT
Organization: WorldWide Access - Chicagoland Internet Services
Lines: 38
Message-ID: <46ecjt$[e-mail]>
References: <461te1$[e-mail]>
NNTP-Posting-Host: vh1-021.wwa.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)


Excuse my ascii art but, this  configuration has served me well
on my 4-1000A home brew for three years.  If you have any questions, talk to me
on 3.875 Mhz nightly.

                                                      73 de Gary
                                                            KF9CM


     /     ----||||-----     \
     |   /               \   |
     |   |                 |   |
     |   |                 |   |
     |   |       tube    |   |
     |   |                 |   |  Chimney
     |   |                 |   |    <==
     |   |                 |   |
     |   |                 |   |
     |    \              /   |
   _| _  [ |______| ] _ | ________
  |          [ | ]  [ | ]  <==  Pins          |
  |                             &                |  <==  Sealed chassis
  |                            Socket         |
  |                                               |
  |                                               |
  |                                               |
  +---------------------------------------------+
        | MUFFIN FAN    |
        |_____________ |

           ^  ^  ^  ^  ^
               AIR








From [e-mail] Fri Oct 27 12:35:05 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: DDS Article in 73
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Thu, 19 Oct 95 20:15:03 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 34


>
> The one thing about the AD7008 is that its output is very dirty and one needs
> to employ proper filtering before using it on the air.  It does look like an
> excellant part to be used with Rhode's article (he does mention it)
> "A High-Performance Hybrid Frequency Synthesizer"
>
> Bill Kirkland
> VE3JHU
>
>

Hi Bill...speaking of using DDS' on the air...
Do you have any good wideband amp designs to get the milliwatt signal
up around the watt or 2 range ? (Must be 12 volt design).
There was an article in 73 magazine a couple of years back called
the "Technowhizzy"...it used a Qualcomm DDS along with a 1 or 2 watt
wideband amp but apparently the amp design was a flop (how it made it to
print is beyond me !?).
I'm dying to get my Harris based DDS on the air for QRP work !

Thanks..Hugh  VA3TO



---
 ■ NFX v1.3 [000]

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



From [e-mail] Fri Oct 27 12:35:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.interlog.com!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: DDS Article in 73
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Thu, 19 Oct 95 21:18:05 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 34


>
> The one thing about the AD7008 is that its output is very dirty and one needs
> to employ proper filtering before using it on the air.  It does look like an
> excellant part to be used with Rhode's article (he does mention it)
> "A High-Performance Hybrid Frequency Synthesizer"
>
> Bill Kirkland
> VE3JHU
>
>

Hi Bill...speaking of using DDS' on the air...
Do you have any good wideband amp designs to get the milliwatt signal
up around the watt or 2 range ? (Must be 12 volt design).
There was an article in 73 magazine a couple of years back called
the "Technowhizzy"...it used a Qualcomm DDS along with a 1 or 2 watt
wideband amp but apparently the amp design was a flop (how it made it to
print is beyond me !?).
I'm dying to get my Harris based DDS on the air for QRP work !

Thanks..Hugh  VA3TO



---
 ■ NFX v1.3 [000]

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



From [e-mail] Fri Oct 27 12:35:07 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!bcarh8ab.bnr.ca!news
From: Bill Kirkland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS Article in 73
Date: Mon, 23 Oct 1995 10:15:21 -0400
Organization: Bell Northern Research
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: bgtyi23.bnr.ca
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b1J (Windows; I; 32bit)

Check out RF Design for the Radio Amateur (ARRL) and look
in the Motorola application notes.  Motorola makes some
good wide band amps (but they aren't all that in expensive).

Don't forget to use an anti-aliasing filter on the output of
the DDS.

I also stand corrected on the output of the DDS. The AD7008
has its spurs 50 dB down - fine for transmission but not good
for a high performance receiver.


Bill Kirkland
VE3JHU


From [e-mail] Fri Oct 27 12:35:08 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!sdd.hp.com!hp-pcd!news.vcd.hp.com!news
From: Don Huff <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS Article in 73
Date: 26 Oct 1995 19:23:35 GMT
Organization: Hewlett-Packard
Lines: 10
Message-ID: <46on7n$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpvcldu.vcd.hp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.05 9000/720)
X-URL: news:[e-mail]

Hi Dave,
  Please send me more info on your rotary encoder for the DDS chip.  I have
two AD7008 chips,and I too want to enter the data from a KNOB.  How are
you interfacing the encoder to the PIC?  I too am thinking of using a PIC
processor.  I have an operational 40W rig now, including homebrew RX,
for 40 meter CW and FSK (Amtor/Pactor).  The DDS would make a heckuva nice
VFO and LO for it.  One DDS source does both.
  73, and GL
                Don, W6JL



From [e-mail] Fri Oct 27 12:35:09 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.shentel.net!usenet
From: [e-mail] (Michael A. Rutkaus)
Newsgroups: rec.radio.amateur.homebrew
Subject: DSI 3500 Freq Counter schematic?
Date: 26 Oct 1995 21:59:25 GMT
Organization: Action Resume Service
Lines: 8
Message-ID: <46p0bt$[e-mail]>
NNTP-Posting-Host: eb1ppp10.shentel.net
X-Newsreader: WinVN 0.90.3

I have a circa 1987 or so "DSI 3500" Freq Counter which doesn't count;
anyone know if the company is still in busines and where I could get
come info on it???

Thanks,

Mike
K4QET


From [e-mail] Fri Oct 27 12:35:09 1995
From: [e-mail] (Bob Liesenfeld)
Path: news.epix.net!news.sprintlink.net!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of am car ra
Message-ID: <[e-mail]>
Date: Fri, 20 Oct 1995 19:32:44 -0100
X-FTN-To: [e-mail]
Lines: 24

WW>That's correct Terry, The input of an AM car radio is usually a very
WW>hi z bridging input, because the antenna is a hi z voltage probe.
WW>It's nowhere near the impedance of the line feeding the antenna, and
WW>nowhere near 50 or 100 ohms.
WW>
WW>The suggestion of a load resistor is excellent. If it detunes the
WW>input of the radio and causes problems he could load the converter
WW>with a low z load, and bridge the RX in with a low value cap.
WW>
WW>73 Tom
WW>
WW>---
WW> * Origin: HamLink RBBS - 612/HAM-0000 v.34 St. Paul, MN
WW>(1:282/100.0)
 Hi,
 Seem to be comming in on the middle of this thread... I have had some
experience with SW converters for car use (including the MFJ unit), and
would be happy to share experiences.

   72  Bob   WB0POQ

           Technology is OUT of control.....




From [e-mail] Fri Oct 27 12:35:10 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JimSlavin)
Newsgroups: rec.radio.amateur.homebrew
Subject: International ham statistics--historical
Date: 25 Oct 1995 20:18:22 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <46mk4e$[e-mail]>
Reply-To: [e-mail] (JimSlavin)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am looking for the number of ham radio operators worldwide broken out by
year since the beginning of this century.  I have been able to find
similar information for U.S. hams, but have hit a dead end with
international numbers.  Can anyone point me in the right direction?

Please respond directly by email to "[e-mail]"


From [e-mail] Fri Oct 27 12:35:11 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!netcom.com!joejarre
From: [e-mail] (Joe Jarrett)
Subject: ISD Voice Chip Web Page
Message-ID: <[e-mail]>
Keywords: Voice Chip
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
Date: Tue, 24 Oct 1995 18:06:51 GMT
Lines: 21
Sender: [e-mail]

I've seen quite a few posts on here from time to time from people using
the the ISD voice chips availble from Radio Shack and other places.
Excuse the advertising here but there is quite a bit of applications
information now available on these parts via the World Wide Web.

Information Storage Devices, also know as ISD now has a Web page
including quite a bit of applications information.  Eventually (I hope in
the next few weeks) we will have all our data sheets and the entire
Design Manual on line.  Currently, however, there are a number of
application Briefs that show how to use several of the different parts we
make.

Look for the application briefs under http://www.isd.com/apps.html.  They
are listed on the page . . . just click on what you want to see.  The App
Briefs include schematics where appropriate.  Of course, our home page is
http://www.isd.com.
--
***************************************************************************
* Joe Jarrett, K5FOG                | A liberal is a conservative who got *
* [e-mail]               |   arrested.  A conservative is a    *
* Information Storage Devices FAE   |  liberal who got mugged.  These are *
* Austin, Texas                     |        complete definitions.        *
*"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""*
*         These are my ideas alone.  Don't blame anyone else!             *
***************************************************************************


From [e-mail] Fri Oct 27 12:35:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!news.cerf.net!newsserver.sdsc.edu!acsc.com!news.trw.com!news2.trw.com!tnn-wan.trw.com!news
From: David Williams <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood Commands
Date: 25 Oct 1995 21:23:40 GMT
Organization: TRW Space & Electronics Group, Redondo Beach, CA
Lines: 4
Message-ID: <46m9ss$[e-mail]>
NNTP-Posting-Host: dwwilliams.ora.is.TRW.COM

Is there a file of Kenwood TS440 commands and responses? I built an
interface and want to program a rig control app. Thanks -KF6IB

[e-mail]


From [e-mail] Fri Oct 27 12:35:13 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.tele.fi!brahms.tfi.be!usenet
From: [e-mail] (Rudi Logghe)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood on Internet?
Date: Sun, 22 Oct 1995 19:26:10 GMT
Organization: TFI BE
Lines: 12
Message-ID: <46e9fr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 193.210.154.65
X-Newsreader: Forte Free Agent v0.55

[e-mail] wrote:

>I need to know if I can reach Kenwood via Internet?
>I think my TM-742 has a big problem...  :(  HELP!!!

>[e-mail]

Kenwood can be reached at :
"http://www.accessnv.com/kenwood/amateur.html"

Rudi Logghe, ON1JL



From [e-mail] Fri Oct 27 12:35:14 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!news.cerf.net!newsserver.sdsc.edu!acsc.com!news.trw.com!news2.trw.com!tnn-wan.trw.com!news
From: David Williams <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood on Internet?
Date: 25 Oct 1995 21:21:38 GMT
Organization: TRW Space & Electronics Group, Redondo Beach, CA
Lines: 15
Message-ID: <46m9p2$[e-mail]>
References: <[e-mail]> <46e9fr$[e-mail]>
NNTP-Posting-Host: dwwilliams.ora.is.TRW.COM

[e-mail] (Rudi Logghe) wrote:
>
> [e-mail] wrote:
>
> >I need to know if I can reach Kenwood via Internet?
> >I think my TM-742 has a big problem...  :(  HELP!!!
>
> >[e-mail]
>
> Kenwood can be reached at :
> "http://www.accessnv.com/kenwood/amateur.html"
>
> Rudi Logghe, ON1JL
>
Or, www.kenwood.net


From [e-mail] Fri Oct 27 12:35:15 1995
Path: news.epix.net!news.sprintlink.net!hookup!news.uoregon.edu!tank.news.pipex.net!pipex!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!news.msfc.nasa.gov!newsfeed.internetmci.com!miwok!bdt.com!manitou.pirate.org!user
From: [e-mail] (Josh Hoffman)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,uk.radio.amateur
Subject: Re: Kenwood TM-742a w/UT28s
Date: Tue, 24 Oct 1995 23:44:28 -0700
Organization: Pirate systems
Lines: 33
Message-ID: <[e-mail]>
References: <46k0si$n80$[e-mail]>
NNTP-Posting-Host: manitou.pirate.org
Xref: news.epix.net rec.radio.amateur.equipment:20861 rec.radio.amateur.homebrew:11293 rec.radio.amateur.misc:93568 uk.radio.amateur:8775

In article <46k0si$n80$[e-mail]>, Robert  H°yvald
<[e-mail]> wrote:

> To ALL:
> I have a TM_742a with the UT-28s module installed. I also have
> done the expanded TX/RX on the unit. The unit works fine except on
> the 10M side. It seems that the unit can TX up to 45mhz, but it
> will not RX over 30mhz. I sent the unit to Kenwood Service Center
> East and they said it is up to specs. The problem is that I need
> to receive freqs. at 33.94 and lower. I can tranmit there but I
> don't need that  I just need to receive. These are fire bands and
> going to the fire calls without having a scanner in the car would
> be a great help.
>
> Is there anyway to fix this problem???
> ANY HELP IS GREATLY NEEDED!!!
>
> THanks Robert H°yvald, KB2UWJ
I too have the tm-742a with the 28mhz unit and I am having no problem
Reciving over 30mhz. The only problem I am having is that when I tx on
high power in the 28mhz range It locks up the radio. A friend of mine has
the same radio and the recive is fine but he too has the TX problem. I
would check the mod again and make sure you are following the ARTSCI book
and they will work fine.

L8
Josh hoffman KD6WJX

--
**************************************************
Http://www.pirate.org/home/jhoffman
To  talk If I am on [e-mail]
**************************************************


From [e-mail] Fri Oct 27 12:35:17 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: LED question
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <469kcl$[e-mail]>
Date: Sat, 21 Oct 1995 14:25:20 GMT
Lines: 57

In article <469kcl$[e-mail]> [e-mail] (Ken Becker) writes:
>I have a problem that is baffling me: In a stereo equalizer, there is a
>simple pilot lamp circuit, an LED, and originally a 240 ohm, 1/2 watt
>resisitor connecter to a 50 volt dc source. There is no ac ripple, at
>least not measureable, the orignal resistor was open, causing the LED to
>not light, simple so far, right? The LED checks ok, compared to a new
>one, and when the resistor was replaced with the same value, the LED lit,
>for a few minutes and the NEW resistor burned up. I did some checking and
>found that with a 50 volt source in order to have the proper drop, a 2500
>ohm resistor was required, I used a 10 watt resistor, which supplies the
>LED with 1.6 volts DC, it lights at the proper brilliance, but the
>resistor runs hot enough, that I would probably need to use a 25 watt
>resistor to dothe job. I know this is rediculous, as the maunufacturer
>used a 1/2 watt. According to a an article on LEDs, I was supposed to use
>20 milliamps to calculate the resistance and wanted to drop from 50 to 2.
>I am obviously doing something wrong. PLEASE HELP!

Ok, lets do some calculations. The original circuit had a 240 ohm
resistor. For 20 ma of diode current, the voltage feeding the
resistor needs to be

E=0.02*240+1.6 = 6.4 volts

and the resistor power dissipation is

P=.02*4.8 = 0.096 watts

So a half-watt resistor offers a comfortable safety margin.
But if the voltage is 50 volts, then we have a power dissipation
in the resistor of

P=48.4^2/240 = 9.76 watts

A half-watt resistor is going to go *poof*, as it indeed did.
So either the value of the original resistor was *not* 240 ohms,
or the design voltage is *not* 50 volts.

Now you replaced the resistor with a 2500 ohm resistor, so the
power dissipation of that resistor would be

P=48.4^2/2500 = 0.937 watt

A 5 watt resistor would be about right to provide an adequate
safety margin. (You never want to run a resistor at its power
dissipation limit, it'll run about 100 C at that power level.)

But the original resistor was a half-watt unit, indicating a
design dissipation of 1/10th watt or less. Clearly something
is wrong here. I'd suspect it's the 50 volts. Are you *sure*
it's *supposed* to be 50 volts?

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 Oct 27 12:35:18 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!mercury.near.net!noc.near.net!das-news2.harvard.edu!casaba.srv.cs.cmu.edu!fore.com!not-for-mail
From: [e-mail] (Ed Bathgate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: LED question
Date: 25 Oct 1995 13:37:18 -0400
Organization: FORE Systems, Inc.
Lines: 23
Message-ID: <46lske$[e-mail]>
References: <469kcl$[e-mail]> <46jrs5$[e-mail]>
NNTP-Posting-Host: baleen.fore.com
X-newsreader: xrn 7.03


>I have a problem that is baffling me: In a stereo equalizer, there is a
>simple pilot lamp circuit, an LED, and originally a 240 ohm, 1/2 watt
>resisitor connecter to a 50 volt dc source.

KO0B said:>50V in an EQ???  R coulda been 24K.

I agree.  way too low of a R and too hi of a voltage for an eq.

Could you have misread the voltage? Decimal point in wrong place?

 5vdc and 240 ohms sounds closer!

 50v
-------  = .208 amps or 208ma   pretty high current for an LED.
 240 ohms

 .208ma * 50v = 10.4 watts   High dissipation for a 1/2w resistor.

Perhaps your voltage reg went splat?

73  Ed N3SDO



From [e-mail] Fri Oct 27 12:35:19 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: LIGHTINING * HELP *
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <469ffi$[e-mail]>
Date: Sun, 22 Oct 1995 15:25:16 GMT
Lines: 38

In article <469ffi$[e-mail]> [e-mail] [ Marcelo Cury ] writes:
>Hello friends, I have a verticall antenna - dx88 hi-gain.
>I live in a flat, my build has 14 floors.
>There is no protection against lightining, when a storm comes I
>automaticly go under my bed ! HI !
>I used see a static eletric discharge on my rf cable connector.
>I would like to talk about and change experiences about storms, lightning and
>vertical antennas. I am very afraid of it.

You're right to be alarmed. Lightning can be a great hazard if station
layout isn't done properly to guard against it. But if the proper steps
are taken you can even continue to operate during direct strikes. Those
steps may be extreme in some cases, but it can be, and is, routinely
done in the broadcast field.

I need to know some things to be helpful. The first thing I want to
know is what floor of the building houses your station. Considerably
different steps have to be taken if you are on a lower floor than
if you are on the top floor (top floor is usually easier). I need to
know the construction of your building. Is it steel frame with curtain
walls, or is it poured monolithic with mesh reinforcement? I assume
that it is steel with curtain walls at that height, but I need to
know for sure. I also need to know the grounding system of the
building, is it driven steel piers with a Ufer foundation, or is
it block poured on grade? I'd expect the former. I also need to
know about the cable chases used to feed the antenna from your
station, and about how power distribution is done in the building.

Well, that's enough for now. With that information in hand, I can
start to ask the questions needed to give you lightning protective
advice.

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 Oct 27 12:35:20 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!decwrl!tribune.usask.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03
From: mike <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: LIGHTINING * HELP *
Date: Tue, 24 Oct 1995 09:56:49 -0500
Organization: The University of Manitoba
Lines: 37
Message-ID: <[e-mail]>
References: <469ffi$[e-mail]> <[e-mail]>
NNTP-Posting-Host: access.mbnet.mb.ca
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>


On Sun, 22 Oct 1995, Gary Coffman wrote:

> You're right to be alarmed. Lightning can be a great hazard if station
> layout isn't done properly to guard against it. But if the proper steps
> are taken you can even continue to operate during direct strikes. Those
> steps may be extreme in some cases, but it can be, and is, routinely
> done in the broadcast field.
>

In the Amateur Radio field, chances are very very high that operating
during a direct strike will more or less  kill you, along with all your
equipment, regardless of the protection you have invested in. Even if
you have 4 or so 8' copper rods pounded into the ground, lightning
arrestors or gaps that are connected to the rods through HYDRO wire,
etc.

Don't operate your station during a severe lightning storm. Disconnect
all your radio equipment including other equipment in the vicinity of
your radio equipment. By disconnect, I mean UNPLUG power cables from
the mains, and UNPLUG antenna cables. You can go further and ground
the termination of the antenna cable.

Even a good ground system will not protect you from a direct strike,
cause all you need is a little trickle past the system to do the
damage.

I'm not kidding...

Mike
VE4KLM

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



From [e-mail] Fri Oct 27 12:35:21 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!lamarck.sura.net!news.cc.ucf.edu!usenet
From: dean@slinkyworld (dean)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making labels from transparencies
Date: 23 Oct 1995 20:40:43 GMT
Organization: University of Central Florida
Lines: 11
Message-ID: <46gukb$[e-mail]>
References: <[e-mail]> <457vvl$[e-mail]>
NNTP-Posting-Host: 132.170.21.108
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6


>>Has anyone had experience making panel labels for projects using laser-
>>printed transparencies?  With Word for Windows, I can align and print
>>very nice labels.  The only problem is gluing them to a panel.  Nothing I
>>have tried (rubber cememt, contact cement, crazy glue, airplane cement)
>>seems to stick.  I assume the plastic is mylar.
>>

I would use clear contact paper over the laser quality print. Contact paper
is great for a lot of things and I've used it before



From [e-mail] Fri Oct 27 12:35:22 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Manual for Eico 324 Signal Generator
Date: Thu, 26 Oct 1995 16:46:00 GMT
Organization: RST Engineering
Lines: 28
Message-ID: <46oe3p$[e-mail]>
References: <457tu5$[e-mail]>
NNTP-Posting-Host: @rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Koert Koelman ) wrote:

>Hi:

>Do any of you have a manual for an Eico 324 signal generator?  I picked
>one up at a flea market without a manual.

>Of course, I will gladly reimburse you for copying costs and postage.
>Let me know if you could send me a copy.  Thanks.

>                73/KC6WCI@N0ARY.#NOCAL.CA.USA.NOAM

Found the original manual for the 324 in the DUSTY section of the
archives.  If you ever get up to Grass Valley, I'll be glad to meet
you somewhere and get a copy made.

Jim





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



From [e-mail] Fri Oct 27 12:35:23 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (Bill Sorsby)
Newsgroups: rec.radio.amateur.homebrew
Subject: MARS Recommendation Needed
Date: 21 Oct 1995 22:15:20 GMT
Organization: TI
Lines: 8
Message-ID: <46brdo$[e-mail]>
NNTP-Posting-Host: pppsb17.itg.ti.com
X-Newsreader: WinVN 0.92.6+

I've finally decided to try to join MARS.  Can someone provide a
recommendation for which branch, Army, Air Force or Navy-Marines would
be best, both in terms of HF net operation and surplus equipment
availability?


Regards,
Bill, N5BU


From [e-mail] Fri Oct 27 12:35:24 1995
Path: news.epix.net!smackay
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MARS Recommendation Needed
Date: 23 Oct 1995 16:21:51 GMT
Organization: epix.net
Lines: 35
Message-ID: <46gfev$[e-mail]>
References: <46brdo$[e-mail]>
NNTP-Posting-Host: mango.epix.net
X-Newsreader: TIN [version 1.2 PL2]

Bill,
I recommend Army MARS but thats a personal prejudice.  Before I retired,
The MARS program was one that I oversaw.  The Current Chief ARMY MARS has
rvitalized it with considerable emphasis on HF backbone digital comm, ALE
etc between
gateways.  Using a lot of VHF packet at the state level.  Despite rumors
to the cobtrary HF is a live and well.  Both Navy and AF programs are
good too.  They have very active Chiefs who are doing incredible things
with less and less.  One thing the Army Chief has done (lessons learned
from Desert Storm and Somalia) is create fly away hf packages so as soon
as an Army unit deploys it can get on the with MARS Traffic for the soldier.
Also Chief Sutton has developed contingency and operations plans that
more tightly tie Army MARS to Army operations, especially in emergencies..
Contact Mr. Bob Sutton
Chief Army MARS
US Army Information Systems Command
ASOP-HF
Ft. Huachuca, AZ 85613-5000
Get his phone number..used to be an 800# and chat, he can also put you in
touch with Navy and AF.
Glad your interested, it's a great propgram
73,
Scott W7GSM/AAA9SM
P.S. Tell him I sent you....:-)


Bill Sorsby ([e-mail]) wrote:
: I've finally decided to try to join MARS.  Can someone provide a
: recommendation for which branch, Army, Air Force or Navy-Marines would
: be best, both in terms of HF net operation and surplus equipment
: availability?


: Regards,
: Bill, N5BU


From [e-mail] Fri Oct 27 12:35:25 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!newshost.marcam.com!news.netins.net!mcrware.microware.com!dennisg
From: [e-mail] (Dennis Gabler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MARS Recommendation Needed
Date: 25 Oct 1995 12:59:55 GMT
Organization: Microware Systems Corporation, Des Moines, Iowa
Lines: 20
Message-ID: <46lccb$[e-mail]>
References: <46brdo$[e-mail]>
NNTP-Posting-Host: wahz.microware.com
X-Newsreader: NN version 6.5.0 #5 (NOV)

In <46brdo$[e-mail]> [e-mail] (Bill Sorsby) writes:

>I've finally decided to try to join MARS.  Can someone provide a
>recommendation for which branch, Army, Air Force or Navy-Marines would
>be best, both in terms of HF net operation and surplus equipment
>availability?

Whoo boy, are you opening up a can of worms here ;-)  I am involved in Navy
MARS so I cannot claim an unbiased opinion.  I would try to contact a
representative of each service in your are and ask questions. Then go with
whichever one suits what you think you would like.  Navy-Marine Corps MARS
is quite active here in Iowa, and we are getting folks from the other services.
We handle a fair amount of traffic too and have an extensive PACTOR traffic
switch network in place.

--
Dennis Gabler    --o--------------------------=o=--------------------------o--
                                               |
[e-mail] KB5HVN/NNN0BQG___________|       [e-mail]



From [e-mail] Fri Oct 27 12:35:26 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!usenet
From: Bill Webster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Megaohmmeter Schematic Wanted
Date: 21 Oct 1995 17:36:06 GMT
Organization: University of Illinois at Urbana
Lines: 16
Message-ID: <46bb26$[e-mail]>
NNTP-Posting-Host: cat3.ncsa.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1 (X11; U; HP-UX A.09.05 9000/730)
X-URL: news:rec.radio.amateur.homebrew

This request doesn't have anything to do with ham radio but I'll bet there are
some people with that interest that can help me.  I am looking for a schematic
for a megaohmmeter to measure moisture content of wood.  The commercially made
ones usually measure from .1 or 1 megaohm to 10,000 or 100,000 megaohms.  They
usually read this entire range of resistance on one logarithmic scale (a meter
movement) that is labeled with "percent of moisture content".  The more
advanced
meters are digital.  I saw one schematic in Fine Woodworking magazine that used
an op amp but it had 5 linear ranges instead of one logarithmic so it would not
be as convenient to use.

Thanks,

Bill Webster
[e-mail]



From [e-mail] Fri Oct 27 12:35:27 1995
Path: news.epix.net!news.sprintlink.net!druid.borland.com!ico.net!news.zeitgeist.net!bdt.com!miwok!news.wco.com!news-out.internetmci.com!newsfeed.internetmci.com!in1.uu.net!ulowell.uml.edu!vtc.tacom.army.mil!news2.acs.oakland.edu!newshub.gmr.com!rcsuna.gmr.com!sinbad.ph.gmr.com!mdevour
From: [e-mail] (M. G. Devour)
Newsgroups: rec.radio.amateur.homebrew
Subject: MFJ Regenerative SW Receiver Kit Q's
Date: Thu, 26 Oct 1995 11:48:15
Organization: General Motors Research and Development Center
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: mdevour.ph.gmr.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

I'm looking for a SW receiver project to build with my son. A kit like the
MFJ-8100 regenerative is the sort of thing I'm thinking of.

Does anyone have any experience, comments on this radio? Quality and
performance (assuming proper assembly)? The likelyhood of proper assembly
(given that I have decent abilities)?

Alternatively, I can be persuaded to home-brew  ;^)  if someone can point me
in the direction of some reliable, reproduceable SW receiver designs. I have
access to a number of the ARRL books, some Hayward and DeMaw books, and QST's
going back to the mid eighties. I'm prepared to do the research, but, being
busy, I'd appreciate any help in narrowing the search!

Thanks in advance. E-mail or posting to r.r.a.h appreciated.

Mike, KF8XV

[Mike Devour, Citizen, Libertarian                 ]
[[e-mail]                         ]
[I am speaking only for myself.                    ]
[My employer in no way endorses what I have to say ]
[     and I don't speak for them in any capacity...]


From [e-mail] Fri Oct 27 12:35:28 1995
Path: news.epix.net!news.sprintlink.net!simtel!news.kei.com!travelers.mail.cornell.edu!newsstand.cit.cornell.edu!usenet
From: Joel Govostes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Modulation transformer question
Date: 23 Oct 1995 14:24:36 GMT
Organization: Cornell University
Lines: 7
Sender: [e-mail] (Verified)
Message-ID: <46g8j4$[e-mail]>
NNTP-Posting-Host: 132
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-URL: news:rec.radio.amateur.homebrew

I'm interested in building a low-power AM transmitter for 75/40 meters.
I have access to the needed tubes, but need to know:  Is there a source
for new or operational modulation transformers, as would be used in this
case?  I don't recall this type of thing appearing in parts catalogs
anymore.   Thanks N1AEP




From [e-mail] Fri Oct 27 12:35:29 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Modulation transformer question
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <46g8j4$[e-mail]>
Date: Tue, 24 Oct 1995 03:08:39 GMT
Lines: 31
Sender: [e-mail]

in <46g8j4$[e-mail]>, Joel Govostes wrote:
: I'm interested in building a low-power AM transmitter for 75/40 meters.
: I have access to the needed tubes, but need to know:  Is there a source
: for new or operational modulation transformers, as would be used in this
: case?  I don't recall this type of thing appearing in parts catalogs
: anymore.   Thanks N1AEP

You could use an output transformer for a tube audio amp, and feed it
backwards" with a low impedance solid state audio amp.  Make sure
that the one you find can deal with the DC current needed.  Most high
powered audio amp output transformers would be push pull and in their
normal operation the DC would balance out.

Or you could use the autotransformer trick used in the 160 meter rig in
the 1968 ARRL handbook.  This is where you only use the primary of an
output transformer.  One side goes to the final's power, the other side
to a single ended audio output, and the power goes to the center tap.

Or you could try winding your own.  Try finding "Practical Transformer
Design Handbook" by Lowdon.

Or you could skip the transformer.  Some of the later tube AM broadcast
band transmitters use a cathode follower modulation stage totem poled on
top of the final.  (In that case, power dissipation is kept down by
driving the audio stage with a 70 kHz pulse width modulated signal.
Some serious filtering is needed between this stage and the RF final.)

Or use screen grid modulation.

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



From [e-mail] Fri Oct 27 12:35:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Monolithic Amplifiers,help!
Date: 24 Oct 1995 15:56:16 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <46jgd0$[e-mail]>
Reply-To: [e-mail] (W8JI  Tom)
NNTP-Posting-Host: newsbf02.mail.aol.com

I need to find some sources for monolithic amplifiers, similar to the MAR
and MAV series offered by Mini-cicuits. Can anyone help me?
73 Tom W8JI


From [e-mail] Fri Oct 27 12:35:30 1995
Path: news.epix.net!news.sprintlink.net!news.wwwi.com!nntpdist.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Monolithic Amplifiers,help!
Date: 25 Oct 1995 18:40:27 GMT
Organization: Primenet [phone]
Lines: 22
Message-ID: <46m0ar$[e-mail]>
References: <46jgd0$[e-mail]>
NNTP-Posting-Host: usr5.primenet.com
NNTP-Posting-User: ctrask
X-Newsreader: TIN [version 1.2 PL2]

W8JI  Tom ([e-mail]) wrote:
: I need to find some sources for monolithic amplifiers, similar to the MAR
: and MAV series offered by Mini-cicuits. Can anyone help me?
: 73 Tom W8JI

Tom,
        Find yourself a copy of Hewlett Packard's "Communications Compo-
nents" catalogue.  They have a significantly larger selection of these
little goodies, and the prices are comparable with the Mini-Circuits
offerings.

                                                Regards,

                                                Chris Trask

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


From [e-mail] Fri Oct 27 12:35:31 1995
Path: news.epix.net!news.sprintlink.net!wizard.pn.com!satisfied.apocalypse.org!news2.near.net!cocoa.brown.edu!rn
From: [e-mail] (Robert H.B. Netzer)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Need digital filter design
Date: 25 Oct 1995 11:38:40 GMT
Organization: Brown University Department of Computer Science
Lines: 13
Distribution: world
Message-ID: <46l7k0$[e-mail]>
NNTP-Posting-Host: bugs.cs.brown.edu
Xref: news.epix.net rec.radio.amateur.digital.misc:12389 rec.radio.amateur.homebrew:11298

I am looking for advice on building a digital filter.  I have a
real-time 16-bit audio stream, generated by sampling at 16kHz,
that I need to have high-pass filtered to eliminate PL tones.
The filtering is part of a custom repeater controller I'm running
on a Sun Sparcstation 10, so I have plenty of CPU available to run
the filter code.  Years ago someone showed me a "recursive" digital
filter which was extremely simple, replacing each audio sample by
a weighting of the previous two samples (the weights determined the
filter cutoff).  Unfortunately I don't remember the details.  Can
anyone provide help, or at least some references to books or papers?

Rob Netzer, KD1TS
[e-mail]


From [e-mail] Fri Oct 27 12:35:32 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!netcom.com!mbonanno
From: [e-mail] (Mark Bonanno)
Subject: Re: Need Postscript to HP-GL Translator .. Suggestions ?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
References: <46h37b$[e-mail]>
Date: Tue, 24 Oct 1995 20:23:20 GMT
Lines: 17
Sender: [e-mail]

Try ghostscript.

dave ([e-mail]) wrote:
:>Greetings,

:>In need of a translator that will convert poscript files to HP - GL (Laserjet 4L).
:>I'm hoping that someone knows of a freeware/shareware version that will do
:>the job.

:>Thanks

:>[e-mail]
--
======================================================================
Mark Bonanno        | Two things are infinite:  the universe and human
[e-mail] | stupidity; and I'm not sure about the the universe.
                    |                           -- Albert Einstein
======================================================================



From [e-mail] Fri Oct 27 12:35:33 1995
Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.mind.net!news.uoregon.edu!cuhknntp!hpg30a.csc.cuhk.hk!agate!spool.mu.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Aviator270)
Newsgroups: rec.radio.amateur.homebrew
Subject: Opening up the frequency band on Radio Shack scanner
Date: 25 Oct 1995 20:25:04 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <46mkh0$[e-mail]>
Reply-To: [e-mail] (Aviator270)
NNTP-Posting-Host: newsbf02.mail.aol.com

Does anyone know if and how to unlock the frequency blocks on the
Radio Shack Pro-51 scanner?  And if it is not possible, that info would be
just as much apreciated.  Thanks to all who took the time to read this.

T-man


From [e-mail] Fri Oct 27 12:35:34 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.interlog.com!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: PLL/VCO homebrew designs
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Thu, 19 Oct 95 21:18:07 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 37


---clip---
>
> You can't run a '157 at 25MHz; I assume you're using low-side
> injection, but you can't even run a '157 at 20MHz.  The spurs to
> be concerned with are close to the desired frequency, in fact,
> they're space at intervals of your reference frequency.  The
> bandpass filter can't help with these.
> --
---clip---
>  * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
>  * [phone]               | mine and do not necessarily   *
>  * [e-mail]      | reflect those of my employer  *
>


Funny...I'm running the '157 at 26 MHz !  Experiencing a little low
frequency noise...working on lowering that but the chip IS locking
up well at 26 MHz.  I was under the impression that these babies were
designed specifically for cordless phone products in the 46 - 49 MHz
range.  The N divider accomodates ratios 14 bits in length...even beyond
49 MHz with a reference ratio set for 5 KHz step size. Perhaps the
N divider may crap out somewhere before 49 MHz but it seems to be
handling 26 MHz quite well.

Hugh  VA3TO


---
 ■ NFX v1.3 [000]

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



From [e-mail] Fri Oct 27 12:35:35 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.interlog.com!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: PLL/VCO homebrew designs
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Thu, 19 Oct 95 21:18:07 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 36



---clip---
> modulation audio into the VCO. This is easily done by using an op-amp
> mixer to AC couple the modulation into the DC contol voltage.
> There are also plenty of other clever ways to get the same result. The
> important goal is that the coupling must not upset the bandwidth and
> performance of the loop filter.
> Practically any VCO you build will have plenty of linearity to allow +/-
*************************************************************************
> 1.6 Khz of deviation.If you want a VCO design that will cover up to an
> octave tuning range and is virtually foolproof, E-mail me. The real trick
*************************************************************************
> will not be getting the synthesizer to work properly, but in solving the
> subtle problems related to driving the radio properly. Of course, you'll
> never get more of an agile range than the radio tuned circuits are
> designed for, but you can become independent of pesky crystals over the
> limited design range of the radio.
> >

I'm hungry for info from those in the know !
I think I'll take you up on the VCO design...will e-mail you.

Thanks..Hugh VA3TO



---
 ■ NFX v1.3 [000]

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



From [e-mail] Fri Oct 27 12:35:36 1995
Path: news.epix.net!news.sprintlink.net!simtel!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 22 Oct 1995 17:58:42 GMT
Organization: ENST - Telecom Paris
Lines: 21
Message-ID: <46e0oi$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

[e-mail] wrote:

: Funny...I'm running the '157 at 26 MHz !  Experiencing a little low
: frequency noise...working on lowering that but the chip IS locking
: up well at 26 MHz.  I was under the impression that these babies were

Well, you can anyhow use a down-mixer instead of a divider. That would
keep you reference at 5 kHz.
If you have problems with side bands, why not use a '159 chip  ? It has
an analog detector together with a coarse error signal, that would
surely reduce greatly your sidebands problems.
BTW, this a a data I'm interested in : what is the reference level that
can pass through a sample/hold phase comparator ? Normally, if connected
to a JFET type OP-amp which a near infinite Zin, it should generate none.
Or does it ?

Vince

--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From [e-mail] Fri Oct 27 12:35:37 1995
Path: news.epix.net!news.sprintlink.net!news.connect.net!usenet
From: [e-mail] (David Bengtson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: Sun, 22 Oct 1995 19:27:37 GMT
Organization: Connection Technologies
Lines: 38
Message-ID: <46e5qi$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: a1p06.connect.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:


>Funny...I'm running the '157 at 26 MHz !  Experiencing a little low
>frequency noise...working on lowering that but the chip IS locking
>up well at 26 MHz.  I was under the impression that these babies were
>designed specifically for cordless phone products in the 46 - 49 MHz
>range.  The N divider accomodates ratios 14 bits in length...even beyond
>49 MHz with a reference ratio set for 5 KHz step size. Perhaps the
>N divider may crap out somewhere before 49 MHz but it seems to be
>handling 26 MHz quite well.

>Hugh  VA3TO



While I don't doubt that you have a single part locking at 26 MHz, the
fact remains that the data sheet states an Fmax for the MC145157 of 20
Mhz. That is likely to be a conservative estimate, given that it is a
production part.
The one that you have may work at room temperature, but what happens
when you build up a couple of dozen of these, and then put them in
cars. Since you're in Canada, I would expect that these will get
pretty cold in the winter, at night. What happens when the circuit
gets to -40C? I would guess that the '157 will lock below 20 MHz, but
it might not work at 26 MHz. Just something to look out for.
You might want to consider some ot the National Semiconductor
PLLatinum series parts. Very low current, and there is a 2 loop part
that runs to 510 MHz on both loops.

Regards


Dave Bengtson
David Bengtson
Yes, these are my opinions
Looking for Old HP-41 Calculators and Accessories



From [e-mail] Fri Oct 27 12:35:38 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!eastnews1.East.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 22 Oct 1995 18:57:20 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 53
Message-ID: <46e46g$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <[e-mail]>,
 <[e-mail]> wrote:
>
>---clip---
>>
>> You can't run a '157 at 25MHz; I assume you're using low-side
>> injection, but you can't even run a '157 at 20MHz.  The spurs to
>> be concerned with are close to the desired frequency, in fact,
>> they're space at intervals of your reference frequency.  The
>> bandpass filter can't help with these.
>> --
>---clip---
>>  * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
>>  * [phone]               | mine and do not necessarily   *
>>  * [e-mail]      | reflect those of my employer  *
>>
>
>
>Funny...I'm running the '157 at 26 MHz !  Experiencing a little low
>frequency noise...working on lowering that but the chip IS locking
>up well at 26 MHz.  I was under the impression that these babies were
>designed specifically for cordless phone products in the 46 - 49 MHz
>range.  The N divider accomodates ratios 14 bits in length...even beyond
>49 MHz with a reference ratio set for 5 KHz step size. Perhaps the
>N divider may crap out somewhere before 49 MHz but it seems to be
>handling 26 MHz quite well.

If you design to "typical" specs, the Motorola spec sheet suggests
the part will work to something like 26MHz.

However, if you want a design that works reproducibly over a range
of temperature and voltage conditions, you can't design to
typical specs.  Even manufacturing variations may make it
that one '157 works at 26MHz and another doesn't.  The '157
is not even suggested in the Motorola spec sheet to work at
49MHz; they have other parts for this.

The Motorola specs for the '157-2 (the lastest, greatest) specifies
Fmax as:

Vin = 500mV p-p ac-coupled sine wave, Vcc=5V: 15MHz
Vin = 1V p-p ac-coupled sine wave, Vcc=5V: 20MHz
Vin = Vss to Vdd square wave, Vcc=5V: 22MHz.

For Vcc = 9V, you can get up to 25MHz, but that's it.

The earlier parts, like the one Rick probably used, are specified
much lower.

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


From [e-mail] Fri Oct 27 12:35:40 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail] (William Houston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PLL/VCO homebrew designs
Date: 22 Oct 1995 23:25:11 GMT
Organization: Your Organization
Lines: 45
Message-ID: <46ejsn$[e-mail]>
References: <[e-mail]> <46e5qi$[e-mail]>
NNTP-Posting-Host: ix-sd11-27.ix.netcom.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-NETCOM-Date: Sun Oct 22  4:25:11 PM PDT 1995
X-Newsreader: WinVN 0.99.6

In article <46e5qi$[e-mail]>, [e-mail]┌ says...
>
>[e-mail] wrote:
>
>
>>Funny...I'm running the '157 at 26 MHz !  Experiencing a little low
>>frequency noise...working on lowering that but the chip IS locking
>>up well at 26 MHz.  I was under the impression that these babies were
>>designed specifically for cordless phone products in the 46 - 49 MHz
>>range.  The N divider accomodates ratios 14 bits in length...even beyond
>>49 MHz with a reference ratio set for 5 KHz step size. Perhaps the
>>N divider may crap out somewhere before 49 MHz but it seems to be
>>handling 26 MHz quite well.
>
>>Hugh  VA3TO
>
>
>
>While I don't doubt that you have a single part locking at 26 MHz, the
>fact remains that the data sheet states an Fmax for the MC145157 of 20
>Mhz. That is likely to be a conservative estimate, given that it is a
>production part.
>The one that you have may work at room temperature, but what happens
>when you build up a couple of dozen of these, and then put them in
>cars. Since you're in Canada, I would expect that these will get
>pretty cold in the winter, at night. What happens when the circuit
>gets to -40C? I would guess that the '157 will lock below 20 MHz, but
>it might not work at 26 MHz. Just something to look out for.
>You might want to consider some ot the National Semiconductor
>PLLatinum series parts. Very low current, and there is a 2 loop part
>that runs to 510 MHz on both loops.
>
>Regards
>
>
>Dave Bengtson
>David Bengtson
>Yes, these are my opinions
>Looking for Old HP-41 Calculators and Accessories


I wonder if Hugh is running a prescaler before the synth.?

William N6AGV



From [e-mail] Fri Oct 27 12:35:41 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (If you want my name just ask. )
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio Control kits/plans
Date: 22 Oct 1995 19:20:43 GMT
Organization: Netcom
Lines: 12
Message-ID: <46e5ib$[e-mail]>
References: <[e-mail]> <46b7s9$[e-mail]> <46c23i$[e-mail]>
NNTP-Posting-Host: ix-pon-mi3-13.ix.netcom.com
X-NETCOM-Date: Sun Oct 22 12:20:43 PM PDT 1995


I would like to build a radio control transmitter and reciever for 6m.
I have used several commercially available units for 72 MHz but it's
time to really do it right.

Anyone have plans or knowledge of RC for 6m. I am a builder but have
never seen anything along those lines.

Regards,

Tim Hynde
ka8ddz, Rochester MI


From [e-mail] Fri Oct 27 12:35:42 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!bs872
From: [e-mail] (Henry Ian Ross)
Subject: Re: Radio Control kits/plans
Message-ID: <[e-mail]>
Sender: [e-mail] (Henry Ian Ross)
Reply-To: [e-mail] (Henry Ian Ross)
Organization: The National Capital FreeNet
References: <[e-mail]> <46b7s9$[e-mail]> <46c23i$[e-mail]> <46e5ib$[e-mail]> <[e-mail]>
Date: Tue, 24 Oct 1995 15:50:18 GMT
Lines: 20


   snip ---
> Many years ago, I built a six-channel radio on 6M using a design
> published as a series of articles by Radio Control Modeller (RCM)
> magazine. If you can find some older issues circa 1970 or contact
> RCM, they may be able to send you the information.

Tim,
I checked my copy - the issues of RCM are April 1968 to January 1969.

Hope this helps ...
Ian



--
Scouter Ian Ross (VE3ARE)
First Collins Bay Sea Venturers
Kingston, Ontario
[e-mail]


From [e-mail] Fri Oct 27 12:35:43 1995
Path: news.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Recommendation for a good "Grid Dipper"
Date: 21 Oct 1995 00:41:14 GMT
Organization: Primenet [phone]
Lines: 43
Message-ID: <469fjb$[e-mail]>
References: <461aff$[e-mail]>
NNTP-Posting-Host: usr6.primenet.com
NNTP-Posting-User: ctrask
X-Newsreader: TIN [version 1.2 PL2]

Johan Forrer ([e-mail]) wrote:
: Hi All,

: I am looking for a professional quality "grid-dipper". Essentially it
: should have better than average sensitivity and good operating range from
: say 1 - 500 Mhz (switched ranges/coil packs are OK too). Price is not an
: object (within reason of course).

: This is for remotely detecting the resonance frequency of a passive
: resonator - remote means a couple of inches away from the resonant
: circuit which is inaccessable, though not shielded.

: I would be most grateful if anyone could recommend a manufacturer/source
: for such an instrument.

: Much thanks,

: Johan Forrer, KC7WW

Johan,
        James Millen is still in business and they can be contacted at:

                James Millen Manufacturing Company
                P.O. Box 4215
                Andover, MA 01810-4215

                [phone] (voice)
                [phone] (FAX)

        I purchased a factory reconditioned 90651-A from them earlier this
year, and then later found a 90651 at a surplus dealer for a mere $125!
I then sold my Heathkit GD-1A to a fellow in Georgia.  The reconcitioned
ones from Millen come with a full warranty.  And they still make all of
the coils so's you can get down to 165 KHz if you want.


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


From [e-mail] Fri Oct 27 12:35:44 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!news.ti.com!sislnews.csc.ti.com!usenet
From: [e-mail] (Richard Biddle)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Recommendation for a good "Grid Dipper"
Date: 24 Oct 1995 14:25:51 GMT
Organization: Military Products
Lines: 14
Message-ID: <46it1f$[e-mail]>
References: <461aff$[e-mail]> <46gedh$[e-mail]>
NNTP-Posting-Host: biddle.mo.ti.com
X-Newsreader: WinVN 0.99.5

If you are still looking for a grid dip meter, MFJ's 1996 catalog showed up
yesterday with a 1.5 to 250 MHz dip meter for $120.  Its solid state with a
built in sine wave modulator.

MFJ: 1-800-647-1800

I haven't tried one myself, I'm still looking for an old classic at the
swaps, but if I don't have any luck there I may check this one out.

73
Richard, KB5WLH





From [e-mail] Fri Oct 27 12:35:44 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: NAME: <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: TS-50 TX MOD , NOT SHURE ????
Date: 26 Oct 1995 00:12:13 GMT
Organization: ORG:
Lines: 19
Message-ID: <46mjot$2ri$[e-mail]>
Xref: news.epix.net rec.radio.amateur.equipment:20873 rec.radio.amateur.homebrew:11297

i was told that the extended transmit modification is asfollows:-

1. remove bottom cover.

2. locate pll board.

3. find only non-surface mount diode on pll board.

4. cut out diode , replace cover , switch radio on.

job done.

i have not yet tried this could someone plse tell me if this is
correct...
i am also interested in other mods , undocumented features ,etc..

THANX!

ROB


From [e-mail] Fri Oct 27 12:35:45 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Fritz-o-matic)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Unwanted Fm station   (1)
Date: Sat, 21 Oct 1995 23:10:27 GMT
Organization: Netcom
Lines: 21
Message-ID: <46bumk$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-nas-nh2-05.ix.netcom.com
X-NETCOM-Date: Sat Oct 21  4:11:16 PM PDT 1995
X-Newsreader: Forte Agent .99b.112

On Sat, 21 Oct 1995 13:20:20 -0100, [e-mail] (Doug Reed)
wrote:

>to: all
>A question was asked by [e-mail]
>
>>>I live in the country. Too bad, right? My favorite FM stereo
>>>station is 100 miles away on 102.1 FM. The problem is an
>>>FM station 5 miles from my house transmitting 50KW on 101.9 MHz.
>
- snip -

        What  country does "[e-mail]" live and how far from what
border? 0.2 MHz between channels does not sound as if both stations
are in the US. I believe that the FCC regs have the frequencies
divided by 0.8 MHz between 88 & 108 MHz.
        In any case I would suggest a phased vertical array for best gain and
f/b ratio, but what do I know? I missed the original post...





From [e-mail] Fri Oct 27 12:35:47 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in1.uu.net!eskimo!localhost
From: [e-mail] (Bill Turner)
Subject: Re: Unwanted Fm station   (1)
X-Nntp-Posting-Host: tia1.eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: Eskimo North (206) For-Ever
X-Newsreader: News Xpress Version 1.0 Beta #4
References: <[e-mail]>
Date: Mon, 23 Oct 1995 13:29:37 GMT
Lines: 7

>the undesired (side and back) directions.  Finding a null can give a
>20 dB (1/10th) reduction (or more) in signal strength.
-------------------------------------------------------
Nitpick mode ON:

20 dB is a 100:1 power reduction.  10 dB is 10:1.



From [e-mail] Fri Oct 27 12:35:49 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!kd4nc!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Unwanted Fm station   (1)
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <46bumk$[e-mail]>
Date: Sun, 22 Oct 1995 15:05:07 GMT
Lines: 63

In article <46bumk$[e-mail]> [e-mail] (Fritz-o-matic) writes:
>On Sat, 21 Oct 1995 13:20:20 -0100, [e-mail] (Doug Reed)
>wrote:
>>A question was asked by [e-mail]
>>
>>>>I live in the country. Too bad, right? My favorite FM stereo
>>>>station is 100 miles away on 102.1 FM. The problem is an
>>>>FM station 5 miles from my house transmitting 50KW on 101.9 MHz.
>>
>- snip -
>
>       What  country does "[e-mail]" live and how far from what
>border? 0.2 MHz between channels does not sound as if both stations
>are in the US. I believe that the FCC regs have the frequencies
>divided by 0.8 MHz between 88 & 108 MHz.

US channel assignments are 200 kHz apart. But *in the same market*
the FCC assigns stations with first, second, and third channel guard
bands based on certain mileage separation standards. Thus, *in the
same market*, you won't find FM stations on adjacent channels, instead
they'll be 800 kHz apart as you note. But this fellow is trying to
receive a station in a *distant market*. That can be on an adjacent
channel with a station in his local market. The separation rule for
stations on first adjacent channels is 75 miles. Since he says the
station he wants is 100 miles away, that's within the FCC guidelines.


>       In any case I would suggest a phased vertical array for best gain and
>f/b ratio, but what do I know? I missed the original post...

Something everyone seems to be missing is that most FM broadcasting is
done with  *circular* polarization. Vertical polarization is not used
(except as a component of circular polarization). In the beginning,
only horizontal polarization was allowed for FM (and TV), but the FCC
allowed circular polarization for either a couple of decades ago and most
FM stations switched. A few TV stations switched too, but most of them
are going back to horizontal (including my station, CP presents problems
for TV signals when the receiving antennas aren't CP, ghost city).

Anyway, for FM stations, there is an advantage to using circular
polarization in that they are receivable both on home horizontal
polarized antennas and on auto vertical antennas. So nearly all
FM stations use CP, but this makes a simple pattern nulling antenna
more complex. If you can't arrange a null in both the vertical and
horizontal planes, and phased properly, you won't get more than a
3 db null on the station.

One option is to build a CP antenna cut to the channel of the
desired station. If the polarization sense of the two stations
is different, you'll get up to a 30 db null on the reverse
polarization sense. If they're the same sense, at least you'll
get signal cancellation on any reflected signals from the
undesired station since reflection reverses the handedness of
a CP signal, IE LHCP becomes RHCP after a reflection. That
can help a lot when trying to separate signals not on the
same line.

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 Oct 27 12:35:49 1995
From: [e-mail] (Doug Reed)
Path: news.epix.net!news.sprintlink.net!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Unwanted Fm station   (2)
Message-ID: <[e-mail]>
Date: Sat, 21 Oct 1995 13:20:20 -0100
X-FTN-To: Uucp
Lines: 12

     --==<<< Continued from previous message >>>==--
area is going to bouce some of the signal into the first antenna.  The
more random signals you have bouncing around, the less likely you'll be
able to null out the offending station.  Good luck.

73's.

Doug Reed, N0NAS        email: [e-mail]

 * SLMR 2.1a * --T-A+G-L-I+N-E--+M-E-A+S-U-R+I-N-G+--G-A+U-G-E--




From [e-mail] Fri Oct 27 12:35:50 1995
Path: news.epix.net!news.sprintlink.net!news.wwwi.com!nntpdist.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to filter out stupid radio station
Date: 25 Oct 1995 18:48:45 GMT
Organization: Primenet [phone]
Lines: 27
Message-ID: <46m0qd$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: usr5.primenet.com
NNTP-Posting-User: ctrask
X-Newsreader: TIN [version 1.2 PL2]

Stanley Kwong ([e-mail]) wrote:

:         Unfortunatly, it's an FM station.  It comes in at 105.1 from
: about 50 miles away.  The station I want, 105.3, is broadcast from
: the southeast about 100 miles away  BTW, I can't set up any big
: directional antennas, I'm a college student and I don't think the owner
: of the house I'm renting would like me setting anything up on his roof.
: Besides I don't have that much money.
:                                                                 Thanks,
:                                                                 Stan Kwong

Stan,
        Well, the only solution that I can think of that would be cost
effective and help solve your problem here is to upgrade your FM receiver
on you own.  Find the 10.7 MHz bandpass filter (usually ceramic these
days) and replace it with a 150 KHz BW TOKO model SK107M4-A0-10 (Digi-Key
TK2308-ND).  You will notice a loss in fidelity of the desired station,
but a definite reduction in the level of the interfering one.  With the
constrictions given (money, landlord), there's few options available.

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


From [e-mail] Fri Oct 27 12:35:51 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!IntGame!charnel.ecst.csuchico.edu!csusac!csus.edu!zephyr.water.ca.gov!swanee.water.ca.gov!news.ucdavis.edu!dale!ez041502
From: [e-mail] (Psyber)
Newsgroups: rec.radio.amateur.homebrew
Subject: Want to jam stupid radio station
Date: 19 Oct 1995 06:37:42 GMT
Organization: University of California, Davis
Lines: 5
Message-ID: <464rnm$[e-mail]>
NNTP-Posting-Host: dale.ucdavis.edu
X-Newsreader: TIN [version 1.2 PL2]

        Is this possible?  I'd only want to jam one particular signal in a
small area.  I don't know if this'll help me pick up the station I like,
which happens to be right next to it, but I'd like to jam it just out of
spite.  And yes, I'm sure the FCC isn't going to approve.
                                                                Stan Kwong


From [e-mail] Fri Oct 27 12:35:52 1995
Path: news.epix.net!news.sprintlink.net!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: Want to jam stupid radio station
Date: 21 Oct 1995 15:39:29 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 6
Message-ID: <46b47h$[e-mail]>
References: <464rnm$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

Well, the best way to jam a station is with a bazooka. And you will surely
be able to put up with the fact that not only the FCC will dislike
you.

Otherwise, since the reputation of amateur radio is suffering from lunatics
like you, just go away.


From [e-mail] Fri Oct 27 12:35:53 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (If you want my name just ask. )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to jam stupid radio station
Date: 21 Oct 1995 16:26:03 GMT
Organization: Netcom
Lines: 29
Message-ID: <46b6ur$[e-mail]>
References: <464rnm$[e-mail]>
NNTP-Posting-Host: ix-pon-mi1-18.ix.netcom.com
X-NETCOM-Date: Sat Oct 21  9:26:03 AM PDT 1995

In <464rnm$[e-mail]> [e-mail] (Psyber)
writes:
>
>Is this possible?  I'd only want to jam one particular signal in a
>small area.  I don't know if this'll help me pick up the station I
>like,>which happens to be right next to it, but I'd like to jam it
>just out of spite.  And yes, I'm sure the FCC isn't going to approve.
>                                                       Stan Kwong


Stan:

I assume from your posting your looking to jam a commercial station
since you wanted to "jam" them in order to hear another. I doubt you
have the funds nessesary to actually create a high powered jamming
signal, your only other option would be to destroy the radio stations
transmitter or antenna.

 Either solution has the potential to land you in jail.

If your really sincere about trying to receieve another station, but
can't due to interference from another. Then let your posting state
that. Your much more likely to get help in designing a filter or
antenna than advise on criminal activity.

Regards,

Tim Hynde



From [e-mail] Fri Oct 27 12:35:54 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!news.pubnix.net!usenet
From: Mark Hillier <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to jam stupid radio station
Date: 22 Oct 1995 13:31:51 GMT
Organization: HVW Technologies
Lines: 13
Distribution: inet
Message-ID: <46dh47$[e-mail]>
References: <464rnm$[e-mail]>
NNTP-Posting-Host: port95.pubnix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Not a good idea. Besides being something the FCC would put you in jail
for, it won't help your plight. Even if you *could* come up with the kind
of equipment necessary to jam a commercial broadcast station, your
'jammer' would have to be more powerful that the station itself. Guess
what happens next ? your 'jammer' now blocks out the nearby station you
want instead of the original station. Its a lose - lose situation. What
you *could* do however, is get yourself a more selective receiver (*much*
cheaper that legal counsel -especially in sue-me USA)

Mark

VE2HVW



From [e-mail] Fri Oct 27 12:35:55 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to jam stupid radio station
Date: 23 Oct 1995 18:41:28 GMT
Organization: Hewlett-Packard
Lines: 19
Message-ID: <46gnko$[e-mail]>
References: <464rnm$[e-mail]> <46b6ur$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <46b6ur$[e-mail]>,
>writes:
>>
>>Is this possible?  I'd only want to jam one particular signal in a
>>small area.  I don't know if this'll help me pick up the station I
>>like,>which happens to be right next to it, but I'd like to jam it
>>just out of spite.  And yes, I'm sure the FCC isn't going to approve.
>>                                                      Stan Kwong
>

When I was in college, I had a vacuum tube operated FM clock radio.
I discovered that the LO radiation on it was so bad that it would
wipe out radios in my dorm room or next door if it was tuned 10.7
MHz. lower in frequency.  I had lots of fun silencing my roommates'
(and neighbor's) radios when they listened to music I didn't like.
They never figured out what hit them!

Rick Karlquist
[e-mail]


From [e-mail] Fri Oct 27 12:35:56 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!homer.alpha.net!mvb.saic.com!netnews.wku.edu!netnews.wku.edu!scottcr
Newsgroups: rec.radio.amateur.homebrew
Subject: Want: COIL winding machine
Message-ID: <[e-mail]>
From: [e-mail] (Chris Scott)
Date: 23 Oct 95 10:04:46 CDT
Organization: Western Kentucky University, Bowling Green, KY
Nntp-Posting-Host: wkuvx1
Nntp-Posting-User: scottcr
Lines: 15

I am looking for a coil-winding machine.  Large or small, motor driven
or manual,

What do you have?

Thanx, Chris

WB9NEQ  Bowling Green, KY

--
[e-mail]  Chief Engineer, Public Radio- Western KY U
                     Telco: [phone]  Hm & Fax: [phone]
...just another insignificant VAX user.        \\\//
                                               (o o)
--------------------------------------------ooO-(_)-Ooo-----------------------


From [e-mail] Fri Oct 27 12:35:57 1995
Path: news.epix.net!news.sprintlink.net!gatech!atglab.bls.com!cssun.mathcs.emory.edu!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!msunews!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!pcies4.trl.OZ.AU!ddiamond
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: BFO design
Date: Fri, 20 Oct 1995 15:59:47
Organization: TRL
Lines: 26
Message-ID: <[e-mail]>
References: <a117cb$[e-mail]>
NNTP-Posting-Host: pcies4.trl.oz.au
Keywords: BFO
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]


>I would appreciate it if someone could point me to a BFO design
>that I could build, so that I can use my conventional sw receiver
>for cw and ssb.  I have seen older designs, but they contain hard
>to get, but once plentiful, components like variable capacitors.
>Thank you.>Howard, n1vxs

Howard; see if you can get a copy of;
"A Semi-kit Receiver for 75/80 Meters" DeMaw- QST Aug '85, p 34. Included is a
BFO circuit for 455 kHz (uses standard IF transformer), and perhaps also;

"Voltage Controlled Oscillator uses ceramic resonator" Helfrick, Ham
Radio June '85. p 18. Lots of ideas using ceramic oscillator resonators,  and;

"A high-stability BFO for Receiver Applications" Bernini, Ham Radio June 85, p
28.  VCXO ideas, and;

"Using Ceramic Resonators in Oscillators" Braithwaite; Radio Communications
Feb. '94, p 38. VCXO using ceramic resonator. Should be adaptable to
individual frequencies.

73, Drew, VK3XU. Telstra Research Laboratories.



filtersforSee


From Unknown Fri Nov 03 12:00:23 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!torn!news1.toronto.fonorola.net!infoshare!whome!gts!westonia!humnet.humberc.on.ca!hduff
Subject: PLL/VCO homebrew designs
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
Date: Fri, 27 Oct 95 21:35:04 EST
Message-ID: <[e-mail]>
Organization: HumberNet LSS
Lines: 33



rkarlquist says:

> Why didn't you say:  "what is the appropriate solution to this problem?"
> rather than saying "I've already decided to use a simple synthesizer".
>

I've already heard your "appropriate solution".  ("Don't bother...use
crystals")
I'll continue to pursue the synth approach...perhaps it may turn out to
be a little more complex than a straight PLL chip, simple loop filter
and VCO but that was never a problem...I never stated that I intended
to attempt to use the "simple minded solution".  As simple as necessary
may include the use of a prescalar and an active loop filter.
I've been getting the response that I expected via e-mail from a
fellow who does this stuff for a living...at no time did he suggest
that this is a waste of time.
Thanks for your input nevertheless,
Hugh  VA3TO




---
 ■ NFX v1.3 [000] Graphic Offline Mail Reader.

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



From Unknown Fri Nov 03 12:00:24 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: R2 Rx PCB supplier?
Date: Fri, 27 Oct 95 22:25:03 GMT
Organization: Home
Lines: 9
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

Does anyone know of a supplier of PCBs for the R2 receiver described in
the 1995 ARRL handbook?

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 Unknown Fri Nov 03 12:00:24 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.mid.net!news.sdsmt.edu!con_126.dorm.sdsmt.edu!cem1116
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: help w/ headphones
Date: Sun, 29 Oct 1995 07:04:28 GMT
Organization: South Dakota School Of Mines and Technology
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: con126.dorm.sdsmt.edu
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

Hello out there.  I built a small crystal radio, and I need some 2000 Ohm
headphones for it.  If anyone has a set lying around, or if you know where I
could buy some, please let me know.  Thanks in advance.

Christopher Misterek

South Dakota School of Mines and Technology

[e-mail]




From Unknown Fri Nov 03 12:00:25 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!io.org!van-bc!fonorola!Rezonet.net!qbc-clic!com18!daniel.lacasse
Newsgroups: rec.radio.amateur.homebrew
In-Reply-To: [e-mail]
Subject: TM-742A defect, HELP!
From: [e-mail]
Message-ID: <[e-mail]>
Date: Sun, 29 Oct 95 12:19:00 EST
Organization: Babillard COM18 BBS
Lines: 29

Hi all,

I own a TM-742A and have a problem with it now...

While I was searching which keys to press while powering onto change
the ON/OFF time, I tried (F + LOW) and POWER ON.  The unit did not like it!

Now, my radio is like always ON.  So I had to disconnet it from the
car battery.

If I reconnect it, it immediatly show me "- On -" then after two seconds
the brightness goes higher (pass from brightness level 6 (default) to
level 1 (my choice while it was working well).  And then, after 2 more
seconds, all the display goes black.  But the radio seems always to
be on because I can hear really low noise (like an open squelch)
from the external speaker.

I look up in the book if the key pressed were corresponding to a function
and it says 28 MHz selection of band (wide or narrow).

I tried to press MR key while reconnect to the battery for a reset but
if failed...  :(

Is there something to do!?!


                                            [e-mail]

___ Blue Wave/QWK v2.20 [NR]


From Unknown Fri Nov 03 12:00:26 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.mailorder.com!news.avatar.com!avatar.avatar.com!kory
From: Kory Hamzeh <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Yeasu G-5400B Computer Interface Specs
Date: Sun, 29 Oct 1995 14:32:21 -0800
Organization: Avatar Consultants, Inc.
Lines: 25
Message-ID: <Pine.BSD/[e-mail]>
NNTP-Posting-Host: avatar.avatar.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Xref: news.epix.net rec.radio.amateur.homebrew:11330 rec.radio.amateur.equipment:20979


Hi Everyone,

I'm building a device like the Kansas City Tracker & Tuner and I am
trying to figure out the computer interface for the Yeasu G-4500B AZ/EL
Rotor. I've called Yeasu, but they don't have any written specs. I tech
support person was nice enough to fax me the schematic of their GS232
box, which provides a RS-232 interface to the rotor.

What I need to know is the voltage range of the el & az positions
indicators and how much current I need to drive the step up/down &
left/right controls.

It should be a neat project. I'm using the Parallax Basic Stamp2 chip
with two National Semiconductor ADC0831 A/D chips and a Maxim 233 TTL to
RS-232 converter. This little device will receive the azimuth and
elavation and doppler shift via an RS-232 port on my PC, and then it will
position the antanna and tune the radio. I'm writing a little windows
program which gets all this information from WinOrb using a DDE
interface. If anyone is interested, let me know.

Thanks,
Kory
KE6VWO



From Unknown Fri Nov 03 12:00:27 1995
Path: news.epix.net!news.sprintlink.net!news.indy.net!usenet
From: "Thomas D. Cox" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help w/ headphones
Date: 29 Oct 1995 23:49:39 GMT
Organization: IndyNet-Indys Internet Gateway
Lines: 8
Message-ID: <4713uj$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 199.3.70.157
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]

Christopher,

If no headsets turn up, you might try a crystal earphone. They're pretty
high-impedance, and very efficient.

Tom, KA5NEE/9
[e-mail]



From Unknown Fri Nov 03 12:00:28 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.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: Easy PL-259 in Nov. QST
Date: 30 Oct 1995 01:05:36 GMT
Organization: Netcom
Lines: 32
Message-ID: <4718d0$[e-mail]>
References: <[e-mail]> <4713uj$[e-mail]>
NNTP-Posting-Host: ix-pon-mi4-05.ix.netcom.com
X-NETCOM-Date: Sun Oct 29  5:05:36 PM PST 1995


Hints & Kinks, November QST page 83

Easy PL-259 connections?

There is a description of how to solder a PL-259
connector to coaxial cable. This suggestion was put
forth by ARRL Technical advisor out of Texas, I'm not
an engineer but this appears to me to be a poor design.


a) it leaves the cable succeptable to water.
        (yes I know you wrap it, but wouldn't it be
        better to have the sheath inside the connector?
        I mean thats what the sheath is for isn't it?)

b) it appears to use the braid to support the cable
        (leaves the sheath with not much to do)

c) the author suggests to plug the holes with dabs of
        solder, weren't these designed for ground
        connections? Does not appear the braid comes up
        that far in this pictorial.

d) the author suggests wrapping #14 wire around the braid
        which is still exposed. What does this accomplish?

The intent is not to ridicule someone elses suggestion.
Im just wondering why QST would publish this since it's
in conflict with their own Handbook.




From Unknown Fri Nov 03 12:00:29 1995
Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 2000 Ohms headphones
Date: 30 Oct 1995 04:58:42 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 2
Distribution: world
Message-ID: <471m22$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

Radio Shack sell a transformer, 1000 Ohms to 8 Ohms for 2 dollars.



From Unknown Fri Nov 03 12:00:30 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!acollins
From: [e-mail] (M. Andy Collins)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew six meter transmitter
Date: 30 Oct 1995 05:08:18 GMT
Organization: University of California, Berkeley
Lines: 21
Message-ID: <471mk2$[e-mail]>
References: <[e-mail]> <46rfqg$[e-mail]>
NNTP-Posting-Host: nitride.eecs.berkeley.edu

In article <46rfqg$[e-mail]>,
Mark Manuelian  <[e-mail]> wrote:
>Does any one know of any kits to build low power six meter CW
>transmitters?  I am specifically looking to build a beacon.

Take a look at the kit offered by Kanga.  I haven't tried any
of their stuff, but I found this on the web:

http://ncc1701-d.cc.nd.edu/kanga    (general site)
http://ncc1701-d.cc.nd.edu/kanga/klist.html    (closer to what you're after)


Have fun

Andy

--
//-------------------------------------------------------------------
//  Andy Collins -- KC6YEY               [e-mail]
//           Proud owner and operator of OS/2 Warp 3.0
//-------------------------------------------------------------------


From Unknown Fri Nov 03 12:00:31 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!bga.com!news2.realtime.net!news-out.internetmci.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: How to determine dBm when driving diode mixers with square waves
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date: Mon, 30 Oct 1995 05:13:19 GMT
Lines: 13
Sender: [e-mail]

It is said frequently that driving double balanced diode mixers with
square waves is a good thing.  Question is:  how do you reckon the
appropriate drive level in dBm with square waves?  If a mixer is rated
at, say, +7 dBm LO drive, does this mean +7 dBm as measured on a sine
wave?  If you drive it with a square wave, do you use about the same peak
voltage as you would use with a +7 dBm square wave?  Or do you calculate
the average power of the square wave?  Or what?  :-)

: 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 Unknown Fri Nov 03 12:00:31 1995
Path: news.epix.net!news.sprintlink.net!treasure.coastalnet.com!usenet
From: "Timothy E. Brown" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Ramsey FX-146 Mods
Date: 30 Oct 1995 05:17:04 GMT
Organization: Global Information Exchange Corp.
Lines: 5
Message-ID: <471n4g$[e-mail]>
NNTP-Posting-Host: pm-wlsn1-205.coastalnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Looking for modifications for my Ramsey FX-146 2M transceiver. Like to
have direct frequency input and tone encode. Also any other goodies
for it. Help!
de KB4RXZ



From Unknown Fri Nov 03 12:00:32 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!simtel!harbinger.cc.monash.edu.au!news.uwa.edu.au!classic.iinet.com.au!hades.omen.com.au!news
From: David Sorrel <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.scanner,rec.radio.amateur.homebrew
Subject: Re: an HT from Hong Kong?
Date: 30 Oct 1995 05:43:18 GMT
Organization: Omen Computer Services, Perth, Western Australia
Lines: 16
Message-ID: <471olm$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: vk6vw.omen.com.au
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.equipment:21004 rec.radio.scanner:40164 rec.radio.amateur.homebrew:11343

I travel to Singapore and Hong Kong regularly.  Your equipment will be
less expensive in the US.  Availability in Hong Kong is poor.  Singapore
is pretty good but nothing near to the US.  And I have yet to see any
prices better than in the US.  If you don't know what you are doing, you
can end up with less than what you want, beware.

I have both an Icom IC2GXT and the Kenwood TH79D.  I like both for what
each does.  The Icom is maybe a heavier duty unit.  (note the Icom is 2
meters only and the TH79 is a dual band)  Common problem with the TH79 is
the lack of a memory ch. lockout for scan.  But it is a good ratio.  The
Kenwood is somewhat less sensitive to pager interference than the Icom.

Advise:  Buy at home.

David, VK6VW



From Unknown Fri Nov 03 12:00:33 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2000 Ohms headphones
Date: Mon, 30 Oct 1995 09:50:58 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 12
Message-ID: <[e-mail]>
References: <471m22$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <471m22$[e-mail]>

Yes, we have tried matching transformers as well.  First they have about
three db insertion loss.  Secondly, the higher impedance has so much more
audio recovery that they are worth the additional expense.  Most stereo
phones are 40 ohm impedance and even those units are not as sensitive as
the crystal "ear plug" units.

On 30 Oct 1995 [e-mail] wrote:

> Radio Shack sell a transformer, 1000 Ohms to 8 Ohms for 2 dollars.
>
>
>


From Unknown Fri Nov 03 12:00:34 1995
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!hilbert.dnai.com!hoho.quake.net!usenet
From: Larry Cochrane <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Q: Using polarized caps back to back
Date: Mon, 30 Oct 1995 12:27:54 -0800
Organization: QuakeNet Internet Services (email [e-mail])
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: sys1.webtronics.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b1J (Windows; I; 32bit)

Hi,

I need a very long time constant and need a non-polarized cap
around 100uf. I have some questions about using polarized caps
back to back:

1. Is there any long term problems doing this.

2. What type of cap should be used, aluminum electrolytic or can
   I use tantalums.

Thanks,
Larry Cochrane
[e-mail]
----------------------------------------------------------------
Public Seismic Network
Check out http://psn.quake.net for information on who to build
your own seismograph station.


From Unknown Fri Nov 03 12:00:35 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!EU.net!sun4nl!localhost
From: [e-mail] (erwin cremers)
Subject: *** design of 10mtr to 6 mtr transverter ***
X-Nntp-Posting-Host: solair1.inter.nl.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News at news)
Organization: NLnet
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Date: Mon, 30 Oct 1995 12:43:32 GMT
Lines: 10



Hello,

I'm looking for the schematic of a transverter from 10 Mtr to 6 Mtr, does any
one have experience with a transverter that he/she has build and does any body
 know were i can find info on this subject or the kompleet schematics (i
prefer the last option).

Thanks,


From Unknown Fri Nov 03 12:00:35 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: diode mixer drive level
Date: 30 Oct 1995 13:01:05 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 12
Distribution: world
Message-ID: <472iah$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

John Seboldt asks about square wave diode mixer drive as compared
to sine wave. My custom has been to use a square wave of *current*
with the same peak amplitude as the peak amplitude of a sine wave.
The drive power will be 2 or 3 dB greater, but in practice mixers are
quite tolerant of a little additional power. When the square wave of
*current* can actually be achieved (at very high frequencies it is
very difficult) the mixer intermodulation performance can be
significantly improved, if all other conditions such as resistive
IF load can be met. The diodes tend to "square off" the voltage
waveform, so it is the current waveform that is most important.
The best driver circuit is a current source rather than a voltage
source. Bill Sabin W0IYH.


From Unknown Fri Nov 03 12:00:37 1995
Path: news.epix.net!news.sprintlink.net!news.wwwi.com!nntpdist.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with Loop Antenna Articles
Date: 30 Oct 1995 14:45:40 GMT
Organization: Primenet [phone]
Lines: 63
Message-ID: <472oek$[e-mail]>
NNTP-Posting-Host: usr4.primenet.com
NNTP-Posting-User: ctrask
X-Newsreader: TIN [version 1.2 PL2]


Joseph Carr, "Small Loop Antennas for MW, AM BCB, LF and VLF Reception"
Elektor Electronics, June 1994 and July 1994

J. Barendrecht, "Wideband Active Loop Antenna"
Elecktor Electronics, March '95

        Oh yes, the address is:

                Chris Trask
                P.O. Box 25240
                Tempe, Arizona 85285-5240

        Thanks in advance for your assistance.

                                                Regards,

                                                Chris Trask

From nnrp1.news.primenet.com!nntpdist.primenet.com!ctrask Mon Oct 30 07:42:49 1995
Path: nnrp1.news.primenet.com!nntpdist.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.antenna
Subject: Help with Loop Antenna Articles
Date: 30 Oct 1995 01:56:53 GMT
Organization: Primenet [phone]
Lines: 30
Message-ID: <471bd6$[e-mail]>
NNTP-Posting-Host: usr5.primenet.com
NNTP-Posting-User: ctrask
X-Newsreader: TIN [version 1.2 PL2]
Xref: nntpdist.primenet.com rec.radio.amateur.antenna:16728
Xref: nnrp1.news.primenet.com rec.radio.amateur.antenna:16728

        I have had no luck at all in locating the following articles that
were cited by a fellow from Australia about a month ago:


        Joseph Carr, "Small Loop Antennas for MW, AM BCB, LF and VLF Reception"
        Elektor Electronics, June 1994 and July 1994

        J. Barendrecht, "Wideband Active Loop Antenna"
        Elecktor Electronics, March '95

Elecktor Electronics is a Dutch magazine that is available in English.  There
is an address in New Hampshire, but I haven't been able to get a response
yet.  If anyone out there has access to these two articles, I would be very
happy :) to have copies.

        Thanks in advance for your assistance.

                                                Regards,

                                                Chris Trask


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


From Unknown Fri Nov 03 12:00:38 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!delmarva.com!udel!news.udel.edu!diusys!dave
From: [e-mail] (Dave Dabell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: *** design of 10mtr to 6 mtr transverter ***
Date: 30 Oct 1995 14:50:07 GMT
Organization: University of Delaware
Lines: 19
Message-ID: <472omv$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: diusys.cms.udel.edu
X-Newsreader: TIN [version 1.2 PL2]

erwin cremers ([e-mail]) wrote:
: Hello,
: I'm looking for the schematic of a transverter from 10 Mtr to 6 Mtr, does any
: one have experience with a transverter that he/she has build and does any body
:  know were i can find info on this subject or the kompleet schematics (i
: prefer the last option).
: Thanks,
Down East Microwave has a complete kit for a transverter as you describe.
In addition, they offer just the PC Board and documentation for $15 us.

Down East Microwave
954 Rt. 519
Frenchtown, NJ  08825
[phone]

Good luck with your project!
73,  dave  wa3u




From Unknown Fri Nov 03 12:00:38 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!info.uah.edu!hubcap.clemson.edu!usenet
From: [e-mail] (Bill DuBroff)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew six meter transmitter
Date: 30 Oct 1995 15:48:46 GMT
Organization: Clemson University
Lines: 12
Message-ID: <472s4u$[e-mail]>
References: <[e-mail]> <46rfqg$[e-mail]>
NNTP-Posting-Host: wdubrof_pc.eng.clemson.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.3

In article <46rfqg$[e-mail]>, [e-mail]
says...

Does any one know of any kits to build low power six meter CW
transmitters?  I am specifically looking to build a beacon.


Believe Ten-Tec sells this type of kit.

wd
KF4ECX



From Unknown Fri Nov 03 12:00:39 1995
Path: news.epix.net!news.sprintlink.net!jaring.my!genes!wired
From: [e-mail] (Eugene Kang)
Newsgroups: rec.radio.amateur.homebrew
Subject: Pop. Elect. 800Mhz receiving ant for tx on 2m?
Message-ID: <[e-mail]>
Date: Mon, 30 Oct 95 15:51:42 GMT
Organization: My_Organisation
Lines: 12

Can I adapt the 800MHz scanner antenna featured in Pop. Electronics (Nov '95)
for use as a transmitting antenna on 158MHz? (1.48 foot radials)

IS there any gain?

Is there a better (but simple) antenna for txing on 158MHz?

Will the loss be significant if I used 25 feet of RG-58 cable?


thanks!



From Unknown Fri Nov 03 12:00:40 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Q: Using polarized caps back to back
Date: Mon, 30 Oct 1995 17:21:25 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <[e-mail]>

Larry, what you are really talking about is the old fashioned AC
capacitor used in motor starting.  First I would suggestion you simply
ask for a motor starting capacitor used in antenna rotors.  They are just
about the right value you need.
     If you would like to make your own, place diodes in series with any
polaraized capacitor in the right direction to prevent reverse polarity
and do a similar thing with another capacitor/diode in the reverse
direction. Wire them in parallel. This is a very suitable replacement often
better than the original and far cheaper but larger in volume.  73 Cliff  W6HDO


On Mon, 30 Oct 1995, Larry Cochrane wrote:

> Hi,
>
> I need a very long time constant and need a non-polarized cap
> around 100uf. I have some questions about using polarized caps
> back to back:
>
> 1. Is there any long term problems doing this.
>
> 2. What type of cap should be used, aluminum electrolytic or can
>    I use tantalums.
>
> Thanks,
> Larry Cochrane
> [e-mail]
> ----------------------------------------------------------------
> Public Seismic Network
> Check out http://psn.quake.net for information on who to build
> your own seismograph station.
>
>


From Unknown Fri Nov 03 12:00:41 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!in2.uu.net!pmafire!net.ricks.edu!usenet
From: [e-mail] (James Griffith)
Subject: Drake 2B receiver missing tube manual, what is it?
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet)
Organization: Ricks College
X-Newsreader: WinVN 0.93.11
Mime-Version: 1.0
Date: Mon, 30 Oct 1995 17:59:17 GMT
Lines: 9

Have Drake 2Breceiver that is missing 100kc crystal calabrator tube at
rear center of chassie. I need ID of that tube if it could please be
E-mailed to me. I wood pay for a copy of the manual, and some extra if
someone would be willing to ship it to me, or even just a scematic.

TNX
Jim, WA7NDD
[e-mail]



From Unknown Fri Nov 03 12:00:42 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!scsing.switch.ch!news.dfn.de!fu-berlin.de!zrz.TU-Berlin.DE!netmbx.de!newsun.netmbx.de!netmbx.netmbx.de!gerhard
From: [e-mail] (Gerhard Hoffmann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS Article in 73
Date: 30 Oct 1995 20:31:14 GMT
Organization: netmbx GbR, Berlin, Germany
Lines: 21
Message-ID: <473cmi$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: netmbx2.netmbx.de

In article <[e-mail]>, Dave Fifield  <[e-mail]> wrote:
>I bought a 50MHz AD7008 from Newark for $53...they have them in stock.
>
>Whilst we wait for quadrature outputs, does anyone have a good design
>for a digitally bandswitched quadrature generator (one phase splitter
>for each of the HF bands)?
>

Harris's HSP45106 has fixed quadrature outputs and Qualcom's
Q2334 Dual DDS Chip can be run in a quadrature mode.
You can even have 90.01 degrees of phase delay to make up
for your mismatched analog filters.

Gerhard


--
#  Gerhard Hoffmann            #     phone: [phone]     #
#  Gleditschstr. 79            #     fax:   [phone]     #
#  D10823 Berlin               #     on the air:  dk4xp            #
#  Germany                     #     in the air:  d-1441, d-kick   #


From Unknown Fri Nov 03 12:00:43 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!news.cais.net!netaxs.com!usenet
From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to determine dBm when driving diode mixers with square waves
Date: Mon, 30 Oct 1995 20:36:15 -0800
Organization: Net Access - Philadelphia's Internet Connection
Lines: 11
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: slip-748.netaxs.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b1 (Windows; I; 16bit)

The local oscillator port of a double balanced mixer sees the equivalent of 2
diodes in series. Once the diodes turn on, the LO voltage is clamped at the
diodes' forward voltage. Assuming that the diodes clamp to about .7 volts each,
and there are 2 series diodes in the LO voltage path, you get an LO voltage
requirement of about 1.5 Vpp, or 0.5 Vrms for a sine wave. Using the familiar
rule P=(E^2)/R, this equates to 5 milliwatts (7 dBm)for in a 50 ohm system.
If you use a square wave, just be sure that you drive the same 1.5 Vpp signal
into the DBM LO port and you'll be fine.

Joe
WA3CMQ


From Unknown Fri Nov 03 12:00:45 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hpscit.sc.hp.com!paulz
From: [e-mail] (Paul Zander)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Best motherboard for minimum rfi
Date: 30 Oct 1995 20:59:24 GMT
Organization: Hewlett Packard
Lines: 31
Message-ID: <473ebc$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscit.sc.hp.com
X-Newsreader: TIN [version 1.2 PL2]

Paul Erickson ([e-mail]) wrote:
: Has anyone done any comparisons to see which motherboards are best
: from an rfi point of view?? I am planning on replacing the board in
: my old AT, but my current experiences with my NEC multispeed
: (very noisy on 14mhz) are making me cautious about computer generated
: rfi.  Any comments will be appreciated.

: cheers, Paul
: ve7cqk
: email: [e-mail]

This is a valid question.  Well designed metal cases can keep radiation in.
Cables with ferrite chokes can prevent wires from acting like antennas.

A mother board with a properly engineered ground plane can greatly reduce the
amount of RF that is generated in the first place.  Just changing where it
is grounded to the cabinet can change the radiated RF by 10's of dB.
I have seen this numerous times with other digital equipment.

Unfortuanately, I don't have specific recommendations for computer equipment.


73, Paul
[e-mail]

        _/           _/         _/_/     _/_/_/_/    _/_/_/_/_/
     _/  _/       _/  _/     _/         _/     _/           _/
   _/_/_/_/     _/_/_/_/    _/_/_/_/   _/_/_/_/          _/
  _/     _/    _/     _/    _/   _/   _/              _/
 _/     _/    _/     _/     _/_/     _/           _/_/_/_/_/



From Unknown Fri Nov 03 12:00:46 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hpscit.sc.hp.com!paulz
From: [e-mail] (Paul Zander)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making labels from transparencies
Date: 30 Oct 1995 21:03:43 GMT
Organization: Hewlett Packard
Lines: 26
Message-ID: <473ejf$[e-mail]>
References: <[e-mail]> <457vvl$[e-mail]> <46gukb$[e-mail]>
NNTP-Posting-Host: hpscit.sc.hp.com
X-Newsreader: TIN [version 1.2 PL2]

dean (dean@slinkyworld) wrote:

: >>Has anyone had experience making panel labels for projects using laser-
: >>printed transparencies?  With Word for Windows, I can align and print
: >>very nice labels.  The only problem is gluing them to a panel.  Nothing I
: >>have tried (rubber cememt, contact cement, crazy glue, airplane cement)
: >>seems to stick.  I assume the plastic is mylar.
: >>

: I would use clear contact paper over the laser quality print. Contact paper
: is great for a lot of things and I've used it before

One other thing, put the lettering on the bottom side of the plastic to
protect it from wear.  If your software won't print a mirror image,
print it on plastic.  Put that upside down on a photocopy machine, and
make a copy onto a second transparency.


73, Paul
[e-mail]

        _/           _/         _/_/     _/_/_/_/    _/_/_/_/_/
     _/  _/       _/  _/     _/         _/     _/           _/
   _/_/_/_/     _/_/_/_/    _/_/_/_/   _/_/_/_/          _/
  _/     _/    _/     _/    _/   _/   _/              _/
 _/     _/    _/     _/     _/_/     _/           _/_/_/_/_/


From Unknown Fri Nov 03 12:00:46 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!panix!not-for-mail
From: [e-mail] (Andres Mencke)
Newsgroups: rec.radio.amateur.homebrew
Subject: Coherent CW, what is it?
Date: 30 Oct 1995 23:45:04 -0500
Organization: PANIX Public Access Internet and Unix, NYC
Lines: 10
Message-ID: <4749kg$[e-mail]>
NNTP-Posting-Host: panix.com
Summary: Looking for info, literature on coherent CW.
Keywords: QRP, DX, coherent CW, CW, reliable

Is there a technique called "Coherent CW" for
low power, DX communications?

Where can I find more information about it?

Thanks,

73,

Andres Mencke (N2TYZ, [e-mail])


From Unknown Fri Nov 03 12:00:47 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!relay-4.mail.demon.net
From: Ken Linney <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Smith Chart Program
Date: Tue, 31 Oct 1995 00:36:25 GMT
Organization: None
Lines: 38
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: relay-4.mail.demon.net
X-Broken-Date: Tuesday, Oct 31, 1995 00.36.25
X-Newsreader: Newswin Alpha 0.7

Hello Allen
            The following Smith Chart program references might be of
use. I believe they are Shareware initially:

 SCAT : Smith Charting "S" Parameters particularly HF Amplifiers

        by Aciran Software ( In Scotland I believe )
---------------------------------------------------------------
 SMITTY - Transmission line calcs.  by K1TD
---------------------------------------------------------------
 The RFC Program .... A very nice Smith Chart program

   by Giorgio Fontana ( I downloaded mine some time ago from the
                        One Stop LLBBS in the states )
----------------------------------------------------------------
 PUFF - Electrical CAD by California Institute of Technology
-----------------------------------------------------------------
 Techplot Test Drive by Polysoft
          Smith / Gaussian  / complex etc

 One of the "Heavyweights" is MathCad so long as you have the
  Electronic Book part to the program. That has some nice Smith
  Charting possibilities.



            73 Ken





From                          :  Ken Linney BSc.
Available at         Internet :  [e-mail]
Ham Radio Packet AX25 Network :  G3UDA@GB7PMB.#28.GBR.EU
" Being a Quantum mechanic - I could pop up anywhere "



From Unknown Fri Nov 03 12:00:48 1995
Path: news.epix.net!news.sprintlink.net!EU.net!Germany.EU.net!Dortmund.Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!news
From: [e-mail] (Klaus Sch÷nhoff)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tube info required  EEV 8987
Date: Tue, 31 Oct 1995 01:19:15 GMT
Organization: RWTH-AACHEN
Lines: 23
Message-ID: <473te9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pc7195.dialup.rwth-aachen.de
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] schrieb:

> Have recently obtained an intresting tube
> Marked   8987
> stamped Made in England
> It also has a printed EE monogram (almost worn off)

GEC (EEV)
Waterhouse Lane
CHELMSFORD
Essex
CM1 2QU
Tel: [phone]
Fax: [phone]



-------------------------------
Elektronik Gruppe Aachen e.V.
Klaus Sch÷nhoff Tel: [phone]
[e-mail]
-------------------------------



From Unknown Fri Nov 03 12:00:49 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Bob Raymond)
Newsgroups: rec.radio.amateur.homebrew
Subject: DXtreme Amateur Radio Station Log System, Version 2.0
Date: 31 Oct 1995 02:36:45 GMT
Organization: DXtreme Software
Lines: 14
Message-ID: <47423t$[e-mail]>
NNTP-Posting-Host: ix-nas-nh1-25.ix.netcom.com
X-NETCOM-Date: Mon Oct 30  6:36:45 PM PST 1995
X-Newsreader: WinVN 0.92.6

DXtreme Amateur Radio Station Log System(TM)

Designed for HF DXers, this affordable logging program lets you maintain
a database of your contacts and track the DXCC performance of your station.
DXtreme(TM) features attractive, easy-to-use screens, and a full range of
inquiries and reports.

PC/AT-compatibles, MS-DOS 5.0+.  Only $29.95 plus $3.00 shipping in NA.
Write for data sheet.  DXtreme Software, 26 Langholm Drive, Nashua, NH 03062
([e-mail]).

Thanks and 73,

Bob


From Unknown Fri Nov 03 12:00:50 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!xmission!news.cc.utah.edu!news.cs.utah.edu!news.aros.net!usenet
From: [e-mail] (Douglas L. Datwyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DDS Article in 73
Date: 31 Oct 1995 04:12:53 GMT
Organization: ArosNet Inc.
Lines: 37
Message-ID: <4747o5$[e-mail]>
References: <[e-mail]> <[e-mail]> <473cmi$[e-mail]>
NNTP-Posting-Host: anp6.aros.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <473cmi$[e-mail]>, [e-mail] says...
>
>In article <[e-mail]>, Dave Fifield  <[e-mail]>
wrote:
>>I bought a 50MHz AD7008 from Newark for $53...they have them in stock.
>>
>>Whilst we wait for quadrature outputs, does anyone have a good design
>>for a digitally bandswitched quadrature generator (one phase splitter
>>for each of the HF bands)?
>>
>
>Harris's HSP45106 has fixed quadrature outputs and Qualcom's
>Q2334 Dual DDS Chip can be run in a quadrature mode.
>You can even have 90.01 degrees of phase delay to make up
>for your mismatched analog filters.
>
>Gerhard
>
>
>--
>#  Gerhard Hoffmann            #     phone: [phone]     #
>#  Gleditschstr. 79            #     fax:   [phone]     #
>#  D10823 Berlin               #     on the air:  dk4xp            #
>#  Germany                     #     in the air:  d-1441, d-kick   #


I just found this thread. I am curious to know which 73 article this refers to
and hope that someone may be able to e-mail me that jist of the ideas
expressed before it started.

Just in case, e-mail is [e-mail].

TNX

Douglas L. Datwyler
WR7O



From Unknown Fri Nov 03 12:00:51 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modulation transformer question
Date: 31 Oct 1995 05:01:22 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 15
Sender: [e-mail]
Message-ID: <474s5i$[e-mail]>
References: <46g8j4$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <46g8j4$[e-mail]>, Joel Govostes
<[e-mail]> writes:

> I don't recall this type of thing appearing in parts catalogs
>anymore.   Thanks N1AEP

Joel
 I believe the Peter Dahl Co. can supply your needs. Their catalog lists
many
modulation transformers for old rigs.

Their # [phone]

Carl N9EFJ
The2X4


From Unknown Fri Nov 03 12:00:52 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew six meter transmitter
Date: 31 Oct 1995 05:01:35 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 31
Sender: [e-mail]
Message-ID: <474s5v$[e-mail]>
References: <46rfqg$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <46rfqg$[e-mail]>, [e-mail] (Mark
Manuelian ) writes:

>Does any one know of any kits to build low power six meter CW
>transmitters?  I am specifically looking to build a beacon.
>
>
The subject is homebrew so................

Some years ago I built a 6 meter transceiver from a CB.

It worked Ok and I just recently pitched it.

Find a Cybernet PCBoard in an old Kraco, Midland or GE. These boards can
be
identified by the square terminal posts.

There is a lot of modifying involved. You have to rewind the small cans in
nearly
all the stages. It was a real lesson in RF for me. Using all the existing
semiconductors
except the RX RF amp and TX predriver, the receive was fair and I got
nearly 2 watts output.

Its a job but when you talk on it its all worth it.

Schematics are plentiful so if you want to try it I'll send you one.

Email
Carl N9EFJ
The2X4


From Unknown Fri Nov 03 12:00:53 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!eskimo!news
From: [e-mail] (Alan F. Jovanovich)
Subject: Passive Mixer IP3 Question
X-Nntp-Posting-Host: tia1.eskimo.com
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Date: Tue, 31 Oct 1995 08:58:55 GMT
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Please Help!

I have a passive mixer (diode ring DBM) and have measured the
conversion loss to be 9.3 dB at the frequencies I am interested in
with the drive level I have.

The manufacturer (RF Prime) gives me an Input Intercept Point of
+8dBm.

Since the Input IP3 and Output IP3 differ by the gain, do I use a
negative gain here?

In other words, is the Output Intercept  -1.3dBm or +17.3dBm?

I realize that the manufacturers figure is only good for a
non-reactive 50ohm load, and I will have to measure its performance
into my IF filter, but any light that could be shed on the subject
would be most appreciated.  Thanks.

                                [e-mail]
                                Alan F. Jovanovich
                                KA7DAT




From Unknown Fri Nov 03 12:00:54 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!mack.rt66.com!usenet
From: [e-mail] (Kevin Ferguson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Coherent CW, what is it?
Date: Tue, 31 Oct 1995 09:33:37 -0700 (MST)
Organization: Engineering International Inc., Public Internet Access
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[e-mail] (Andres Mencke) wrote:

>Is there a technique called "Coherent CW" for
>low power, DX communications?

Yes, BUT both stations must be so equiped, or at least must be using
keyboards.

The technique is to sychronize sending with master reference (WWV fer
example).The reciever then samples each "time slot" (time slot would
be "dit" length, or 1/2 1/3)and makes a yes/no decision about if the
signal was present.  If yes, then it fills the whole time slot with a
tone. If no, it fills the slot with silence.

It is also possible to lock the reference clock to the incoming
signal, by looking for transitions.  This is required to some degree
even if syncing to WWV, due to variable prop delays..

The keyers used would not "start" untill the beginning of the next
time slot, so took a little getting used to.  Also the reciever
contributes one time slot of delay.

>Where can I find more information about it?

ARRL handbook had section on it for at least a couple of years..maybe
84 to '86...

You can probably do nearly as well using DSP techniques, CCW is in
fact a DSP technique.  CCW filters use knowlege of where the edges
SHOULD be in order to reduce noise.

I don't see why most of the handbook block diagram couldn't be
implimented in a DSP.

Happy building.
-73-
de KO0B




From Unknown Fri Nov 03 12:00:55 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: KA7DAT and Input/output intercept point of diode mixer.
Date: 31 Oct 1995 10:45:57 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 5
Distribution: world
Message-ID: <474up5$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

If two tones, each at +8 dBm at the input, produce IMD equal to
+8 dBm (the intercept point) then at the mixer output the two tones
are -1.3 dB and the IMD is also -1.3 dBM. Using the definition of
intercept point, the OIP3 is -1.3 and the IIP3 is +8 dBm. Bill Sabin W0IYH



From Unknown Fri Nov 03 12:00:56 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!purdue!yuma!lamar.ColoState.EDU!not-for-mail
From: [e-mail] (Watts)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Junkbox? I Need MRF422 txstrs
Date: 31 Oct 1995 10:52:22 -0700
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 13
Message-ID: <475nom$[e-mail]>
References: <[e-mail]> <[e-mail]> <473cmi$[e-mail]> <4747o5$[e-mail]> <4757sc$[e-mail]>
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Mike McLendon ([e-mail]) wrote:
: I am hoping that someone has some MRF422 HF power transistors they

: These transistors are 28 volt 150 watt devices with flat leads and
: secured to the heat sink with 2 machine screws each (sorry I forgot the
: case style number).

Case style 211-11

: Thanks for reading/checking this... 73s

: Mike
: KE4END


From Unknown Fri Nov 03 12:00:57 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!sunsite.doc.ic.ac.uk!geriatrix.bangor.ac.uk!sees.bangor.ac.uk!ug2075
From: [e-mail] ((Mr) N Brodt-Savage)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew six meter transmitter
Date: 31 Oct 1995 11:34:17 GMT
Organization: University of Wales, Bangor.
Lines: 19
Message-ID: <4751jp$[e-mail]>
References: <[e-mail]> <46rfqg$[e-mail]> <472s4u$[e-mail]>
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X-Newsreader: TIN [version 1.2 PL2]

Bill DuBroff ([e-mail]) wrote:
: In article <46rfqg$[e-mail]>, [e-mail]
: says...

: Does any one know of any kits to build low power six meter CW
: transmitters?  I am specifically looking to build a beacon.


: Believe Ten-Tec sells this type of kit.

: wd
: KF4ECX

any european (preferably British) sources for 6 mtr kits ?

Nigel Brodt-Savage
[e-mail]
GW7USO



From Unknown Fri Nov 03 12:00:58 1995
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment,sci.electronics
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!sun4nl!rivm!charlos
From: [e-mail] (Charlos Potma)
Subject: Experience with HAMEG spectrum analysers ?
Message-ID: <[e-mail]>
Sender: [e-mail]
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Date: Tue, 31 Oct 1995 12:20:10 GMT
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Xref: news.epix.net rec.radio.amateur.homebrew:11364 rec.radio.amateur.misc:93810 rec.radio.amateur.equipment:21041 sci.electronics:158205

hello all,

some time ago in rec.radio.amateur.equipment a thread around HAMEG
oscilloscopes developed. Most people seemed to favor these instruments.
I would like to know if anyone here is familiar with the HAMEG 5006 series
spectrum analysers. These analysers are (relatively) low-cost and seem
to be quite adequate for use in homebrewing RF circuits. As an option
the 5006 can be equipped with a tracking generator to be used in
filter measurements.

Any experience with these analysers ?

thank you,

charlos potma
PA3CKR
[e-mail]


From Unknown Fri Nov 03 12:00:59 1995
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!minfox!tom.alldread
From: [e-mail] (Tom Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: TS-50 INTERFACE- IF10D
Date: Tue, 31 Oct 1995 15:46:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
References: <473em4$88u$[e-mail]>
Lines: 58



N> So if any one out there knows what the IF10D is made up of , i
 >would be greatful if you could give me a few pointers.

Greetings ROB:

        You got my curiosity up as I own a TS-50S which I use as a
mobile and did not realize that it had a computer interface jack. As
I only use mine mobile I have not had the occasion to look into
interfacing it (until now).

        I have written a transceiver control program for my TS-850S
which displays the IF spectrum in colour graphics and allows one to
point at a signal with the mouse and leap tune the transceiver to it
with the click of a mouse button.

        I to was not willing to pay the price for an RS-232C to TTL
level converter box either and I ended up building one with a quad op
amp and a 5 volt zener diode with limiting resistor. I power it from the
computer port and use a 7660 power inverter to generate the negative
polarity voltage needed for the RS-232C interface. At the time I was not
aware of the Maxim Semiconductor MAX232.

        The MAX232 is a chip designed to do TTL-RS232C level conversion
with one chip. It has a built in negative voltage charge pump. All you
need is this chip and an external charge pump capacitor to complete the
level conversions. It costs about $3.00 in single unit quantities and
should be commonly available. There is a version of the chip with the
capacitor built in that cost a little more. Check out Maxim's
application information for connection details.

        I took a look at my TS-50S schematic and noticed that 5 volt
power is available on the CN6 DIN connector which I believe could be
used to power the MAX232. The TXD, RXD, CTS and RTS serial com port
signals are passed through individual RF low pass filters (series 470
Ohm resistor with shunt 0.01uF capacitor) directly to the micro
controller port pins. PLEASE NOTE that the application of excessive or
wrong polarity voltage on one of these pins could possibly destroy the
microprocessor!!! This appears to be a typical 0 Volts logical low and 5
Volts logical high CMOS interface but you may wish to play it safe
by limiting the logical highs to +4V as the micro controller is powered
one diode junction voltage drop below 5V (to provide for battery backup
switching).

        I hope this information is of some help. Hopefully someone will
respond with the exact details of the Kenwood IF-10 schematic which you
could probably duplicate at a low cost.

        If you get any other information on the TS-50S I would
appreciate it if you would pass it on to me.

        Good luck with your project.

73 de VE7TMA

---
 * QMPro 1.53 * Very Best Regards, [e-mail]


From Unknown Fri Nov 03 12:01:00 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Re: How to determine dBm when driving diode mixers with square waves
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Tue, 31 Oct 1995 18:08:39 GMT
References: <[e-mail]>
Nntp-Posting-Host: hplsnb.lsid.hp.com
Organization: Hewlett-Packard
X-Newsreader: TIN [version 1.1 PL9.4]
Lines: 22

Rocci ([e-mail]) wrote:
: The local oscillator port of a double balanced mixer sees the equivalent of 2
: diodes in series. Once the diodes turn on, the LO voltage is clamped at the
: diodes' forward voltage. Assuming that the diodes clamp to about .7 volts each,
: and there are 2 series diodes in the LO voltage path, you get an LO voltage
: requirement of about 1.5 Vpp, or 0.5 Vrms for a sine wave. Using the familiar
: rule P=(E^2)/R, this equates to 5 milliwatts (7 dBm)for in a 50 ohm system.
: If you use a square wave, just be sure that you drive the same 1.5 Vpp signal
: into the DBM LO port and you'll be fine.

Which immediately begs the question, "What of mixers rated for +17dBm or even
+27dBm LO input?"  After all, +27dBm is 1/2 watt, and at 50 ohms, this is 5
volts RMS at 50 ohms...  Maybe all this is related to Bill Sabin's posting
suggesting that drive from a high-impedance source is preferred, and to the
fact that junction diode dynamic resistance is about 25mV/I  -- bigger I
results in lower "on" resistance.  (Why doesn't Bill post things as
followups so they appear in the same thread they obviously reference?)

--
Cheers,
Tom
[e-mail]


From Unknown Fri Nov 03 12:01:02 1995
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!news.interlog.com!news.dra.com!news.mid.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!lade.news.pipex.net!pipex!tcp.co.uk!usenet
From: Steve Lorek <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: Tue, 31 Oct 1995 19:11:44 +0000
Organization: Total Connectivity Providers - Internet access for the UK
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: an107.du.pipex.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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Just to update our thousands of visitors in the past few days. The Ham Radio
Today On-Line pages are all ready for the grand opening on November 3rd.
We've got loads of features (reviews, ex-PMR conversions, beginners guides,
news etc.) ready for the day, so be prepared. So you'd better all stay up
until midnight on the night, because that's when it'll be released! That's
00:00 hours on November 3rd! The URL is:

                     http://www.tcp.co.uk/~slorek/

No other site can touch Ham Radio Today On-Line - you won't believe your
eyes when you see it!

--------------------------------------------------
| Steve Lorek    |       [e-mail]        |
--------------------------------------------------
| Editor, Ham Radio Today On-Line, the best      |
| Amateur Radio Web site in the world!!! Visit   |
| it at    http://www.tcp.co.uk/~slorek          |
--------------------------------------------------


From Unknown Fri Nov 03 12:01:02 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help w/ Power Supply
Date: 31 Oct 1995 19:39:36 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <476fk8$[e-mail]>
References: <Pine.BSD/[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <Pine.BSD/[e-mail]>,
"Edwin J. Bailen" <[e-mail]> writes:

>I have never found a better discussion of
>the workings of the LM723.  I keep my copy under lock and key. ;=)
>
>73 -- Ed Bailen  N5KZW

I'd like to have a copy. :-)

Carl N9EFJ


From Unknown Fri Nov 03 12:01:03 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!van-bc!news.rmii.com!net83.qadas.com!user
From: [e-mail] (George De Grazio)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: *** design of 10mtr to 6 mtr transverter ***
Date: Tue, 31 Oct 1995 19:50:25 -0700
Organization: Hambrew Magazine
Lines: 24
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: net83.qadas.com

In article <[e-mail]>, [e-mail] (erwin
cremers) wrote:

> Hello,
>
> I'm looking for the schematic of a transverter from 10 Mtr to 6 Mtr, does any
> one have experience with a transverter that he/she has build and does
any body
>  know were i can find info on this subject or the kompleet schematics (i
> prefer the last option).
>
> Thanks,

Hi-
Hambrew magazine is currently exploring building options in the realm of 6
meters, among other bands.  We are publishing info on receive converters
and some of our authors are working on transverters as well.  If you get
any info on this subject, please share it with us.  Likewise, if you have
any projects which you have built in any of the HF, VHF or UHF areas, I
would sure like to have a look at them for publication.
Good luck in your quest.
73
George De Grazio, WF╪K
Publisher, Hambrew


From Unknown Fri Nov 03 12:01:05 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!natinst.com!news.dell.com!pmafire!net.ricks.edu!usenet
From: [e-mail] (James Griffith)
Subject: Thanks to all for DRAKE 2B MISSING TUBE INFO.
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet)
Organization: Ricks College
X-Newsreader: WinVN 0.93.11
Mime-Version: 1.0
Date: Tue, 31 Oct 1995 20:03:35 GMT
Lines: 10

Thanks to all. There were 10 E-Mail's. For those of you who need to know,
the missing crystal calibrator tube is a 6BZ6 and manuals for the 2B and
2-BQ can be had from Vintage Manuals at 800-807-6146 for $16 and $5 for
the 2-BQ includes shipping.

How do you like the 800 phone number has to very good final tubes in it.

TNX
JIM, WA7NDD



From Unknown Fri Nov 03 12:01:06 1995
Path: news.epix.net!news.sprintlink.net!news.smartlink.net!pm173-52.smartlink.net!user
From: [e-mail] (Peter Kesselman)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment,sci.electronics
Subject: Re: Experience with HAMEG spectrum analysers ?
Date: Tue, 31 Oct 1995 20:06:42 -0700
Organization: SmartLink.net Premier ISP 805-294-1273
Lines: 31
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pm173-52.smartlink.net
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Xref: news.epix.net rec.radio.amateur.homebrew:11372 rec.radio.amateur.misc:93824 rec.radio.amateur.equipment:21049 sci.electronics:158247

In article <[e-mail]>, [e-mail] (Charlos Potma) wrote:

> hello all,
>
> some time ago in rec.radio.amateur.equipment a thread around HAMEG
> oscilloscopes developed. Most people seemed to favor these instruments.
> I would like to know if anyone here is familiar with the HAMEG 5006 series
> spectrum analysers. These analysers are (relatively) low-cost and seem
> to be quite adequate for use in homebrewing RF circuits. As an option
> the 5006 can be equipped with a tracking generator to be used in
> filter measurements.
>
> Any experience with these analysers ?
>
> thank you,
>
> charlos potma
> PA3CKR
> [e-mail]

The company that I work for used to be a distributor for Hameg. This
spectrum analyzer is ok for the stuff you want to do. The only problem
with Hameg was getting delivery of product. Their stuff was made in
Germany and France. They fill the demand in Europe before shipping product
to the US.

Also, take a look at Protek. They also make a low-cost spectrum analyzer,
although I don't think they have a tracking generator.

--
Peter Kesselman


From Unknown Fri Nov 03 12:01:07 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!vixen.cso.uiuc.edu!usenet
From: Carl Gregory <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to determine dBm when driving diode mixers with square waves
Date: 31 Oct 1995 22:58:03 GMT
Organization: Univ. of Illinois / Biomedical Magnetic Resonance Lab
Lines: 29
Message-ID: <4769lr$[e-mail]>
References: <[e-mail]> <[e-mail]>
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X-URL: news:[e-mail]

[e-mail] (Tom Bruhns) wrote:
>Rocci ([e-mail]) wrote:
>: The local oscillator port of a double balanced mixer sees the equivalent of 2
>: diodes in series. Once the diodes turn on, the LO voltage is clamped at the
>: diodes' forward voltage. Assuming that the diodes clamp to about .7 volts each,
>: and there are 2 series diodes in the LO voltage path, you get an LO voltage
>: requirement of about 1.5 Vpp, or 0.5 Vrms for a sine wave. Using the familiar
>: rule P=(E^2)/R, this equates to 5 milliwatts (7 dBm)for in a 50 ohm system.
>: If you use a square wave, just be sure that you drive the same 1.5 Vpp signal
>: into the DBM LO port and you'll be fine.
>
>Which immediately begs the question, "What of mixers rated for +17dBm or even
>+27dBm LO input?"  After all, +27dBm is 1/2 watt, and at 50 ohms, this is 5

These guys have extra diodes in each leg, so the voltage requirement is higher.
Some also have an RC network in each leg.  See the Merrimac RF and Microwave
Processing catalog (I have a 1992 edition)  Table I, p. 1.3..

BTW, I think that if you use a square-wave, the peak drive voltage can be lower
for equal efficiency.  A sinewave drive should be high-enough level so that it
is significantly clipped by the mixer (thus becoming a square wave).  Think of it
as a valve which turns on when the drive exceeds the threshold.  If the valve
only turns on for a small fraction of a cycle, you won't get much water (signal)
through it).

73 de K8CG