World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_07/_homebre.txt

Text File | 1997-02-01 | 280KB | 6,838 lines

The World of Ham Radio CD-ROM



From [e-mail] Sat Jul 06 13:44:25 1996
From: "Kathryn J. Goerg" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: RF/Microwave CAE Site
Date: Mon, 01 Jul 1996 13:32:29 -0500
Message-ID: <[e-mail]>

The Webb Laboratories RF/Microwave CAE Site is at:

        http://www.webblabs.com

Please inspect our receiver engineering, structure synthesis
and active filter design capabilities.

Kathy Goerg
Webb Laboratories
[e-mail]


From [e-mail] Sat Jul 06 13:44:26 1996
From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: Data on RG-34 coax?
Date: 1 Jul 96 13:47:45 GMT
Message-ID: <[e-mail]>

  Anyone have data on RG-34 coax. It is at least twice the diameter of RG-8.
I had seen a listing of data for various coax cables some time ago but lost it
.

73
Bill wa4lav was ko4ww



From [e-mail] Sat Jul 06 13:44:27 1996
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More toroids
Date: Mon, 01 Jul 1996 20:37:58 -0700
Message-ID: <[e-mail]>
References: <[e-mail]>

Don't forget that the mix versus frequency differences are really only
applicable to tuned circuits where the cores are part of a tank.  In
broadband applications such as transformers the 43 and 61 materials are
capable of operation into the hundreds of MHz, depending on the design.


From [e-mail] Sat Jul 06 13:44:28 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Simple microwave transceiver information
Date: Tue, 02 Jul 1996 04:51:58 GMT
Message-ID: <[e-mail]>

For practical information on microwave transceiver construction,try to
get hold of the "VHF-UHF Manual" by D.S. Evans and G.R. Jessup,
published by the Radio Society of Great Britain (their counterpart of
thr ARRL). Try your local university/engineering library.

Although first published in the 70s, the material is quite relevant
for beginners and the book might still be in print. To order, try
writing the RSGB at 35 Doughty Street, London WC1N 2AE, England.


From [e-mail] Sat Jul 06 13:44:29 1996
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Simple microwave transceiver information
Date: 2 Jul 1996 09:56:48 GMT
Message-ID: <4rarp0$[e-mail]>
References: <[e-mail]>

In article <[e-mail]>,  <[e-mail]> wrote:
>For practical information on microwave transceiver construction,try to
>get hold of the "VHF-UHF Manual" by D.S. Evans and G.R. Jessup,
>published by the Radio Society of Great Britain

For anything but research in amateur radio history the book
is largely useless. Even when the current edition came out
10 years ago, some designs given were obsolete.
It is well written though and I like it, but I can not recomend
it as an introduction.

73, Moritz DL5UH


From [e-mail] Sat Jul 06 13:44:29 1996
From: Matthew Halsey <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: crystal source
Date: 2 Jul 1996 12:33:11 GMT
Message-ID: <4rb4u7$[e-mail]>


Hi,

Does anyone know of a good source of economically priced crystalsa?
I have an old PMR radio which I want to crystal up for a local repeater here i
n Gaithersburg,
MD.

Tks & 73s

Matt W3/G0IHG

[e-mail]
--
INTELSAT




From [e-mail] Sat Jul 06 13:44:30 1996
From: [e-mail](Charles E. Lewis)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Help with FOXHOLE RADIO
Date: 2 Jul 1996 12:59:14 GMT
Message-ID: <4rb6f2$[e-mail]>


 A few weeks ago, I casually read some posts about making a foxhole
radio using a razor blade as a rectifier.  Last weekend, I fell into
possession of a Gillette double edge blade with a sky blue finish still
in the original wax paper.  Is this the type I need?  If so, can
someone give me enough details to make an authentic one?  Also, any
documentation, anectdotes, or facts that would help to make it an
educational display would be appreciated.

  73 de KJ5WA


From [e-mail] Sat Jul 06 13:44:32 1996
From: Rolfe Tessem <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: OLD A.M. KILLOWATT BROADCAST TRANSMITTER WANTED
Date: Tue, 02 Jul 1996 15:54:38 -0400
Message-ID: <[e-mail]>
References: <4qsdrb$[e-mail]> <[e-mail]> <4r3ein$[e-mail]> <4r69mk$[e-mail]>

> I am certainly no lawyer -- but, I THINK that the current laws, passed by ou
r
> wonderful Congress and signed by our wonderful Presidents (Bush/Clinton et.
al.)
> state that if you sell "contaminated" land that the seller is forever liable
 for
> the cost of cleanup. Therefore -- your PCB laden transmitter leaks; you sell
 the
> land to someone; 20-years from now, 1 part per billion PCB is detected; -- y
ou
> are liable for $5-million to get the stuff cleaned up.

The point is that PCBs that are safely sealed inside transformers or capacitor
s are
no hazard whatsoever. What do you think is inside all those pole transformers
you see
up in the air? The PCB problem is that GE dumped tons of the stuff into the Hu
dson
and Housatonic rivers over a period of years. You are not going to have a PCB
problem
from a sealed transformer or capacitor, even if one should happen to leak on y
our
garage floor. I have a number of oil-filled capacitors and transformers and, a
lthough
I may lose sleep over a lot of things, this is not one of them.

Rolfe
W3VH

--
Rolfe Tessem            |       Lucky Duck Productions, Inc.
[e-mail]           |       96 Morton Street
[phone]          |       New York, NY 10014


From [e-mail] Sat Jul 06 13:44:33 1996
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 9 Pin Novar Socket
Date: 2 Jul 96 16:20:59 GMT
Message-ID: <[e-mail]>

Someone was recently looking for a Novar socket for a transmitter
project.  You can get these for (hold your breath) $3.45 at

RF parts
435 South Pacific ST
San Marcos, CA 92069

There is no minimum but there is a minimum shipping of $2 if you order
by check.  There is a $25 minimum if you order by phone.

The part number for the Novar socket is SK9.

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



From [e-mail] Sat Jul 06 13:44:34 1996
From: Matthew Halsey <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: crystal source
Date: 2 Jul 1996 17:41:13 GMT
Message-ID: <4rbmvp$[e-mail]>
References: <4rb4u7$[e-mail]>


By the way, the frequencies I require are 12.19625 MHz and 13.13792 MHz.

Tnx & 73
Matt W3/G0IHG

--
INTELSAT




From [e-mail] Sat Jul 06 13:44:35 1996
From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Help with FOXHOLE RADIO
Date: 2 Jul 1996 19:40:49 GMT
Message-ID: <4rbu01$[e-mail]>
References: <4rb6f2$[e-mail]>

In <4rb6f2$[e-mail]>
[e-mail](Charles E. Lewis) writes:
The article on this was in Hands on Electronics I think, about 5 years
ago. I will see if I still have it.

The razor blade is the correct one with one minor detail, the blade
needed to be used, with the hot spot being next to the corrosion.  Use
a pencil lead for the pickup, an old drawing compass is a good way to
mount the lead.

As for the construction follow any crystal radio direction, make it
work with a germanium diode, then replace the diode with the razor
blade setup.

Good Luck\
Sparky  KI5GY

>
>
> A few weeks ago, I casually read some posts about making a foxhole
>radio using a razor blade as a rectifier.  Last weekend, I fell into
>possession of a Gillette double edge blade with a sky blue finish
still
>in the original wax paper.  Is this the type I need?  If so, can
>someone give me enough details to make an authentic one?  Also, any
>documentation, anectdotes, or facts that would help to make it an
>educational display would be appreciated.
>
>  73 de KJ5WA



From [e-mail] Sat Jul 06 13:44:36 1996
From: Teresa & Paulo Campos <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Yaesu FRG-9600 Schematic!
Date: Tue, 02 Jul 1996 21:19:46 +0100
Message-ID: <[e-mail]>

I have just bought an used Yaesu FRG-9600. I need the schematic for
trying to change the intermediate filter or to add an external module
for weather sats reception.
I would appreciate (and pay expenses) if someone shares it...

Thanks and 73,
Paulo, CT1EFS

[e-mail]


From [e-mail] Sat Jul 06 13:44:36 1996
From: "Earl Needham, KD5XB, in Clovis, NM" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: 6/2 Mobile Antenna
Date: Tue, 2 Jul 1996 22:45:47 -0600
Message-ID: <01bb689a.806e86c0$[e-mail]>


        I want to thank everybody who replied to my query about building a mobile
antenna for 6 & 2.

        Unfortunately, my 5/8 wave Hustler has seen better days, so I ordered a
commercially-marketed antenna to do this.

        Tnx es 73
--
Earl Needham, KD5XB, in Clovis, NM
Phi Mu Alpha Sinfonia, Pi Chi '76
Have you really jumped ROUND PARACHUTES? (Overheard at the Clovis
Parachute Center)



From [e-mail] Sat Jul 06 13:44:37 1996
From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can someone I.D. these Amidon cores' frequency range?
Date: 3 Jul 1996 12:42:47 GMT
Message-ID: <4rdps7$[e-mail]>
References: <4qulvr$[e-mail]> <[e-mail]>

Thanks, Mike!  I will print this info and store it with the cores!

Vy 73 es tu agn de KC5NG ar



From [e-mail] Sat Jul 06 13:44:38 1996
From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: crystal source
Date: 3 Jul 1996 12:43:44 GMT
Message-ID: <4rdpu0$[e-mail]>
References: <4rb4u7$[e-mail]>

In article <4rb4u7$[e-mail]>, [e-mail]
says...
>Does anyone know of a good source of economically priced crystalsa?
>I have an old PMR radio which I want to crystal up for a local repeater
>here in Gaithersburg, MD.


Try JAN Crystals... 1-800-JAN-XTAL... free catalog, good prices/service.

73 de KC5NG



From [e-mail] Sat Jul 06 13:44:39 1996
From: [e-mail] (Paul A. Cianciolo)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS : Cablewave Hardline Connectors
Date: Thu, 04 Jul 1996 01:30:38 GMT
Message-ID: <4rghg8$[e-mail]>

Hello All,

I have the following list of hardline connectors for sale
All connectors are used but in good condition.



(1)    of   HCC-78-50NM  for 7/8"   air

(2)    of   HCC-78-50NF   for 7/8"   air

(2)    of   FLC-78- 50NF   for7/8"  foam

(3)    of   FLC-12-50NM  for 1/2" foam

All 7/8" connectors are $20.00 and the 1/2" are $10.00

[e-mail]





From [e-mail] Sat Jul 06 13:44:40 1996
Newsgroups: rec.radio.amateur.homebrew
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Tony Wilkes)
From: [e-mail] (Tony Wilkes)
Date: Thu, 04 Jul 1996 02:54:11 GMT
Subject: Cw on 2M FM rig

I have an Kenwood TW4000   2m AND 70cm  FM rig with no cw key socket
The query could apply to many FM rigs however.

Is there any risk of damage to the rig if I key the push-to-talk
pins on the mic input socket ?????? and would the output be OK in
waveshape as a clean CW signal ????

If you have done this please let me know your results

Thanks
73 Tony




---------------------------------------------------------------------
Tony Wilkes  ---  Whangaparaoa, North Island, New Zealand
Interests - Ham Radio ZL3SLH- Royal Forest & Bird - Croquet


From [e-mail] Sat Jul 06 13:44:41 1996
From: [e-mail] (Michael P. Deignan)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Need INFO, EVERYONE PLEASE READ!!
Date: 4 Jul 1996 09:28:42 -0400
Message-ID: <4rggua$[e-mail]>
References: <61e7cc$173112.3a2@MYCROFT> <[e-mail]> <[e-mail]>

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

>">I have 12 guage wire i can use, but need a little info,  what length
>">should i cut it at, to use it at 145.470  (local Repeater)  I dont
>">have any kind of swr meter or anything but my radio  which will let me
>">know when its pumping out full power...
>
>       Just a second...
>When we took the Ham test didn't we have to show that we could figure
>frequency to wave length?

No, you merely showed that you knew how to memorize all the questions and
answers provided to you in advance.

MD
--
--
--  Who needs looks when you've got taste?
--
--  If you don't like my opinions, that's just too damn bad.


From [e-mail] Sat Jul 06 13:44:42 1996
From: Bill Meara <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Why difficult to generate high power at UHF?
Date: 4 Jul 1996 10:35:12 GMT
Message-ID: <4rg6p0$[e-mail]>

Here's a question that has been bothering me for a long time:

Why is it that it becomes more difficult to generate RF power as we
increase frequency?  Why do HF transceivers often have more power out on
80 meters than they do on 10?   Why is it so difficult to get lots of
power out in the VHF and UHF ranges?

TIA  73  Bill N2CQR/HI8



From [e-mail] Sat Jul 06 13:44:43 1996
From: [e-mail] (Tim Carter)
Newsgroups: rec.radio.amateur.homebrew
Subject: HAM INFO
Date: 4 Jul 1996 12:35:34 GMT
Message-ID: <4rgdqm$[e-mail]>

I was wondering if there are any sources on the net that cater to the
Amateur radio hobbyist in Canada.  I'm trying to find information on
getting my license so I can join in on all the fun, but I keep finding
all these pages that cater to the american ham.

If you can help me, please do !

Thanks
Tim Carter
[e-mail]


From [e-mail] Sat Jul 06 13:44:44 1996
From: Dan Ellefson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS:  HP 1740A  100Mhz  Oscilloscope
Date: Thu, 04 Jul 1996 14:28:54 -0600
Message-ID: <[e-mail]>
Reply-To: [e-mail]

FOR SALE:   HEWLETT PACKARD 1740A ANALOG 100Mhz OSCILLOSCOPE

        The unit is a two channel 100 Mhz oscilloscope with two external trigg
ers.
It comes with two HP X10 probes that came with the scope and two B&K X10/X1 pr
obes
that I bought brand new.  All the probes are rated at 100 Mhz.  The scope is c
apable
of deflection factors from 1 mV/div to 20 V/div on the vertical scale and 5 ns
/div to
20 s/div on the horizontal scale.  The scope also has a delayed sweep feature
which is
set by a precision control knob which allows delay settings of 50 ns to 20 s.
 Other
features of the 1740A include simultanous display of both input channels and t
he trigger,
bandwidth limit control for attenuation of signals above 20 Mhz, plotting chan
nel A vs B,
choice of 50 Ohm or 1 Megohm input impedance, Chop mode, Alt mode, A+B display
, channel
B inversion (this allows A-B display), trigger selction of channel A, B, or ex
ternal,
trigger level control,LF and HF reject on external trigger inputs, AC, DC, Int
ernal and
External triggering, External /10 triggering, and many more features.
        Documentation for the scope is included and consists of the 1740A Oper
ator's Guide
and the 1740A Operating and Service Manual with includes detailed schematics o
f the scope's
internal circuitry.
        The scope comes with a soft leather pouch with a velcro closure that i
s attached
to the top of the unit allowing storage of manuals and probes.  A hard plastic
 cover is
also included that fits snugly over the front face of the scope to protect the
 controls
and CRT.
        The scope is in very good condition with no noticable dents or scratch
es.  I've had
the scope for quite some time and have been very pleased with its performance
and the great
many features that come with it.  The reason that I am parting with it is beca
use I recently
purchased a brand new $4500 scope (ouch....) and have no need for two scopes.

PRICE:  $495 (buyer pays for shipping)

Contact Dan at [phone] or EMail me at [e-mail]


From [e-mail] Sat Jul 06 13:44:45 1996
From: AC6V <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HAM INFO
Date: Thu, 04 Jul 1996 14:51:59 -0700
Message-ID: <[e-mail]>
References: <4rgdqm$[e-mail]>

Tim Carter wrote:
>
> I was wondering if there are any sources on the net that cater to the
> Amateur radio hobbyist in Canada.  I'm trying to find information on
> getting my license so I can join in on all the fun, but I keep finding
> all these pages that cater to the american ham.
>
> If you can help me, please do !
>
> Thanks
> Tim Carter
> [e-mail]


Hi Tim, lots of Canadian Ham Pages listed on Ron Klimas' page at:

http://uhavax.hartford.edu/~newsvhf/ham-www.html

Also VE7TCP excellent page at:

http://ve7tcp.ampr.org/

Good surfing
73
Rod
--
Hark for I have hurled my words to the far reaches of the earth!
What King of old could do thus??
..... AC6V


From [e-mail] Sat Jul 06 13:44:46 1996
From: Cecil Moore <[e-mail]>
Newsgroups: sci.electronics.basics,sci.electronics.components,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: How do directional RF wattmeters work ?
Date: 4 Jul 1996 15:14:03 GMT
Message-ID: <4rgn3r$[e-mail]>
References: <4rekb7$[e-mail]> <[e-mail]>

"C. J. Hawley" <[e-mail]> wrote:
>I know this will take a little soaking in but it is all you need to reveal
>the magic.

Something else that might help is a vector diagram. Let's say we have a voltag
e
vector proportional to the transmission voltage and another voltage vector
proportional to the transmission line current. When there are no reflections,
these two vectors are adjusted (calibrated) to be equal in magnitude and phase

referenced to the Z0 of the line. Then either with reflections (out of phase V
 and I)
or without reflections (in phase V and I) the following holds:

V(i) (vector add) V(v) is proportional to the forward power and

V(i) (vector sub) V(v) is proportional to the reflected power.

                                   /
                                 / +I
                               /
                             /
                           /
                         /  Phi - Phase Angle
 -V --------------------+-------------------- +V

Let's say we have 10v proportional to the voltage and 10v proportional to the
current and are generating 100w. The following would be true.

For Z0=50 ohms,  V(v)=10v is proportional to 71 volts on the line
                 V(i)=10v is proportional to 1.4 amps on the line

For Z0=75 ohms,  V(v)=10v is proportional to 87 volts on the line
                 V(i)=10v is proportional to 1.15 amps on the line

For Z0=300 ohms, V(v)=10v is proportional to 173 volts on the line
                 V(i)=10v is proportional to 0.58 amps on the line

For Z0=450 ohms, V(v)=10v is proportional to 212 volts on the line
                 V(i)=10v is proportional to 0.47 amps on the line

That's why an SWR meter calibrated for 50 ohms needs to be recalibrated
to work with 75 ohm line.

73, Cecil, W6RCA, OOTC  (not speaking for my employer)




From [e-mail] Sat Jul 06 13:44:47 1996
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question: Reusing Cell Phone on Ham Band
Date: 4 Jul 1996 15:22:22 GMT
Message-ID: <4rgnje$[e-mail]>
References: <[e-mail]>

Larry Grove <[e-mail]> wrote:
>Is it possible to re-use the cell phone's transceiver on a ham band?

Hi Larry, it would be a major project. You would have to change components
and readjust the PLL to lock on the 902 MHz band. But the major task would
be to replace the internal ROM microcontroller with an identical
microcontroller with a different program which, even for me, would
be a major development project. You would need complete documentation on
the device, something that is hard to come by. It would be much easier to
design a 902 MHz HT from scratch, at least for me.

73, Cecil, W6RCA, OOTC  (not speaking for my employer)






From [e-mail] Sat Jul 06 13:44:48 1996
From: "Michael W. Smith II" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTBuild!: 6 meter Linear
Date: Thu, 04 Jul 1996 20:25:04 -0500
Message-ID: <[e-mail]>

I'd like to build a 6 meter linear amplifier.  I'm going to run FM and
SSB on it, and I'm wondering what is involved in building one.  If
someone could point me in the right direction, i'd really appreciate
it!!

73's
Michael
N5TGL


From [e-mail] Sat Jul 06 13:44:49 1996
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why difficult to generate high power at UHF?
Date: Fri, 05 Jul 1996 12:23:46 -0400
Message-ID: <[e-mail]>
References: <4rg6p0$[e-mail]>
To: Bill Meara <[e-mail]>

Bill Meara N2CQR/HI8 wrote:
>
>
> Why is it that it becomes more difficult to generate RF power as we
> increase frequency?  Why do HF transceivers often have more power out on
> 80 meters than they do on 10?   Why is it so difficult to get lots of
> power out in the VHF and UHF ranges?

Radio gear is made to work on higher frequencies by making it
smaller. However, there is no easy way to make the parts more
conductive to keep the losses low.  Thus, more exotic
techniques are used to get the unwanted heat out.

Trying to use excessively large parts doesn't work--you
end up with power going around in circles just
generating heat. Too much heat and the circuit fails.

You can switch to different technologies to maintain a
large size as you go to higher frequencies.

Zack KH6CP/1


From [e-mail] Sat Jul 06 13:44:50 1996
From: [e-mail] (Mark Fraser)
Newsgroups: rec.radio.amateur.homebrew
Subject: Mini Ckts MAR-3/6 Source
Date: 5 Jul 1996 13:00:58 GMT
Message-ID: <4rj3ma$[e-mail]>

Just want a few items from Mini Circuits Labs - who sells in small
quantities?

thanks / mark



From [e-mail] Sat Jul 06 13:44:51 1996
From: [e-mail] (John Kolb)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Mini Ckts MAR-3/6 Source
Date: 5 Jul 1996 22:46:19 GMT
Message-ID: <4rk5vr$[e-mail]>
References: <4rj3ma$[e-mail]>

Mark Fraser ([e-mail]) wrote:
: Just want a few items from Mini Circuits Labs - who sells in small
: quantities?

Mini-Circuits [phone] mainly pushes their ERA line of
Monolithic Amps 0-8 GHz, but you might phone them and see if
they still offer a designer kit for the MAR series. The ERA
series kit K1-ERA contains 10 each of ERA-1 ,2, & 3 for $49.95.



From [e-mail] Thu Jul 11 17:01:32 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!gater3.sematech.org!pulitzer.eng.sematech.org!usenet
From: First Last <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amplitude modulate Minicircuits VCOs ?
Date: Tue, 09 Jul 1996 07:17:46 -0700
Organization: SEMATECH, Austin
Lines: 32
Message-ID: <[e-mail]>
References: <4rsjbh$[e-mail]>
NNTP-Posting-Host: 131.153.40.233
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; I)

Chris Elmquist wrote:
>
> I'm wondering if anyone has played with these VCOs that they
> are now advertising with coverage up thru 2 GHz...  and
> particularly if anyone has amplitude modulated them ??
>
> I'd like to AM modulate a 1 KHz tone (so that I can make
> a little sig gen for use with my old HP 415E swr meter)...
>
> I was wondering if I could just inject the 1 KHz into the
> +V (supply) pin of the oscillator and be able to see it
> on the output across the entire range that the VCO is
> tunable ??
>
> Am I dreaming ?
>
> Thanks for any suggestions...
>
> 73, Chris
>
> --
> Chris Elmquist, N0JCF
> [e-mail]
> [e-mail] haven't tried the Minicircuits VCO but I have used many oth
er ones and
I normally use a Minicircuits voltage controlled attenuator following the
VCO or VCO and buffer.  I have also used other voltage controlled
attenuators with the same results. The Attenuators can provide as much as
40 dBs of modulation range.

73
WA5VTV
Michael


From [e-mail] Thu Jul 11 17:01:33 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (<username>)
Subject: Re: BEER & WINE SHIRTS <> LIQUID POUCH!
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In article <[e-mail]>, [e-mail] (Vin
ce) says:
>


From [e-mail] Thu Jul 11 17:01:34 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (<Pete Goodmann>)
Subject: Re: BEER & WINE SHIRTS <> LIQUID POUCH!
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In article <[e-mail]>, [e-mail] (Vin
ce) says:
>


From [e-mail] Thu Jul 11 17:01:34 1996
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From: Madjid VE2GMI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can someone I.D. these Amidon cores' frequency range?
Date: Wed, 10 Jul 1996 11:22:08 -0700
Organization: Odyssee Internet
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Toroid info on the WEB

http://zeus.cedcc.psu.edu/ind/toroid.html


From [e-mail] Thu Jul 11 17:01:36 1996
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From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cw on 2M FM rig
Date: 9 Jul 1996 18:51:26 GMT
Organization: IT
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In article <[e-mail]>, [e-mail] (Tony Wil
kes) says:
>
>I have an Kenwood TW4000   2m AND 70cm  FM rig with no cw key socket
>The query could apply to many FM rigs however.
>
>Is there any risk of damage to the rig if I key the push-to-talk
>pins on the mic input socket ?????? and would the output be OK in
>waveshape as a clean CW signal ????
>
>If you have done this please let me know your results
>
>Thanks
>73 Tony
>
>
>
>
>---------------------------------------------------------------------
>Tony Wilkes  ---  Whangaparaoa, North Island, New Zealand
>Interests - Ham Radio ZL3SLH- Royal Forest & Bird - Croquet

While CW is not my favorite mode, I have used an Icom IC-2AT with an
old "key" to send CW and with a oscillator to sen MCW.  Never had any
problem and still use the HT.  I also have doen the same thing one on
my IC-28A and it worked fine also.  Most modern, no TR relay, radios
should not be damaged by this. (Just a guess on my part).  Of course
it is odd to have CW inverted by the HT going quite with the CW signal,
and the "hiss" with no signal there....
MCW is better because you can "close" the squelch.
Have fun
.............................................................................
Terry Fugate
UKTV
University of Kentucky
"The opinions expressed herein are mine, and soley mine.  They do not
represent the official view of the University of Kentucky,
the State of Kentucky, or any agency of any government.
If you do not like my opinion, just get on with your life.
I will not change your mind and you damn sure can not change mine."


From [e-mail] Thu Jul 11 17:01:37 1996
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From: Rick Miller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: DON'T FRY THE KIDS!  (Was: RF & materials)
Date: Thu, 11 Jul 1996 08:23:44 -0500
Organization: Exec-PC BBS - Milwaukee, WI
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On Sun, 7 Jul 1996, Michael Spenuk - VA3SP wrote:

> Wonder if any of you have conducted experiments, or
> have come across papers on the interaction of EM waves
> at and near 1.2, 2.4, or  5.7 GHz, with materials?
>=20
> I am particularly interested in the following materials:
> plywood, wafer board and particle board of various
> thicknesses, and; asphalt shingles.  I am interested
> in these materials with varying moisture content,
> and if anyone has studied particular adhesives used
> in these products.
>=20
> I am interested in the effects of these materials when
> located within  the radiating near field of an array.

Hi Mike!

It looks as though you're wanting to come up with some sort of
microwave communications for house-to-house use which doesn't
come with unsightly dishes on masts.  Maybe if you come out and
describe what you're really trying to do, you might get some more
specifically useful help.

In general though, you're going to have no fun at all trying
to pump microwave signals through a sloped roof.

Think about it for a bit...

Where does the part of the signal that doesn't make it through
the roof go?  It gets reflected *DOWN*.  This can generally be
regarded as A Bad Thing=AE, especially in the case of residential
structures.

Rick Miller
--------------------------------------------------------------------------
Raportisto demandis de Mahatma Gandhi, "Sr-o. Gandhi, kio vi pensas pri
Okcidenta Civilizacio?"  Li respondis, "Mi pensas ke gxi estus bona ideo."



From [e-mail] Thu Jul 11 17:01:38 1996
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From: [e-mail] (C Russ Smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help w/ DCR
Date: Wed, 10 Jul 1996 17:47:06 GMT
Organization: Dis
Lines: 10
Message-ID: <4s0qbp$[e-mail]>
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I know this prolly goes to another group, but this one is close...

I have a Jerrold DCR (digital cable radio)  and I need to know if
there is a way to 'enable' it with some kind of hack...


/Space Is The Place\
|---CRussSmith-----|-==> http://sushi.st.usm.edu/~crsmith
\~~revolving kitty~/



From [e-mail] Thu Jul 11 17:01:39 1996
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From: [e-mail] (ka0yos)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Homebrew FSK modem
Date: 7 Jul 1996 02:42:10 GMT
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In article <[e-mail]>,
[e-mail] says...
>
>In article <[e-mail]> Kevin Pounders <[e-mail]>
writes:
>>From: Kevin Pounders <[e-mail]>
>>Subject: Homebrew FSK modem
>>Date: Tue, 02 Jul 1996 00:41:28 -0700
>
>>I am trying to build an FSK modem for use on 2M packet, but the plans
I
>>have calls for a TI TCM3105 FSK modem chip.
>
>>I have contacted all of the component suppliers that I know but am
unable
>>to locate this chip (is now obsoulite).
>
>
>It is not obsolete.  But I think TI is only making them in surface
mount
>packages now.

Try http://www.jdr.com



From [e-mail] Thu Jul 11 17:01:39 1996
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Organization: Forschungszentrum Juelich
Date: Thu, 11 Jul 1996 09:49:14 +02
From: Bob Mueller <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrew Meter
Lines: 15

Because it may not be too well known, I point out that the scales of meter
movements are not very linear.  The scales of good movements are individually
matched or drawn.   I know of one important manufacturer that had several
versions of scales already printed  and selected the one fitting to within the
specified accuracy.  Hewlett- Packard    did (and probably still does)
calibrate its precision meters individually with a computer controlled scale
drawing machine (it was done photographically in the past but might be handled
by LASER printing today, or something of that sort.)
      Just dividing a new scale into uniformly spaced arcs is likely to lead t
o
some errors, though I will hazard no guess how big these will be. If I  needed
accuracy I would make a linear scale, mount it, and feed the meter accurate
currents.  Then make a corrected scale based on the readoff data.   For crude
indicators (S-meter, for example), it is not likely to be worth  the bother.

     Bob


From [e-mail] Thu Jul 11 17:01:40 1996
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From: [e-mail] (AA8XC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrew Meter Scales
Date: 9 Jul 1996 15:20:05 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
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Reply-To: [e-mail] (AA8XC)
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I have had good luck using Autocad and a laser printer. I'm sure other CAD
programs would be as capable.

73's  Jim, AA8XC

Jim Young, AA8XC
Grafton Township, Ohio


From [e-mail] Thu Jul 11 17:01:41 1996
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From: [e-mail] (Tracey Hux)
Newsgroups: rec.radio.amateur.homebrew
Subject: linears
Date: 9 Jul 1996 23:29:50 GMT
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From [e-mail] Thu Jul 11 17:01:42 1996
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From: [e-mail] (JasYoung)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Schurr key
Date: 9 Jul 1996 11:19:07 -0400
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I bought mine from Universal Radio near Columbus, OH via mail order.

73 de AA8XC


From [e-mail] Thu Jul 11 17:01:43 1996
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From: [e-mail] (Christine Jaeger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio/Computer
Date: Sun, 07 Jul 96 09:22:13 GMT
Organization: DIALix Services, Adelaide, Australia.
Lines: 19
Message-ID: <4rnfmg$kkh$[e-mail]>
NNTP-Posting-Host: @local012.adelaide.dialix.com.au

Hi there,

I've got a bc200xlt scanner, and a few other bits of radio gear (still waiting

to get my licence :) )  I've got some paket/rtty/morse decoding s/w on the
computer but i've got a huge problem getting the audio in... the obvoius
compter noise is killing the audio, so here's my question... how can I stop
the noise ?? :))   I'm not sure where its getting in, could be the antenna
(its right next to the audio out) or most probably coming outta the computer
and into the scanner throught the audio cord... is it possible to sheild the
wire and and a coupiling capacitor ?? something like that?? am i on the right
track ??

If ya have any info, or any web site with diagrams/plans for this sorta thing
please mail me :))

Thanks in advance...

kibbet
[e-mail]


From [e-mail] Thu Jul 11 17:01:43 1996
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From: Bob Winingham <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: razor blade radio
Date: 8 Jul 1996 09:08:49 GMT
Organization: OnRamp Technologies; ISP;  Dallas/Ft Worth/Houston, TX USA
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might want to add  high Z  ear/head phone to that list.
The rust spots on the razor blade acts as a diode.




From [e-mail] Thu Jul 11 17:01:44 1996
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From: [e-mail] (Mike A. Penner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Recommendations for mircrostripline design software packages?
Date: Wed, 10 Jul 1996 18:56:17 GMT
Organization: Lucent Technologies, Columbus, Ohio
Lines: 26
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References: <[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82

There is a free transmission line software package at
http://users.deltanet.com/~pekarek/index.html#AWR that seems to be be
quite nice.  You do have to fill out a questionarre to get the
software, but that is relatively painless.

[e-mail] (David A. Wallace) wrote:

>Does anyone have any recommendations for software used in designing
>microstripline circuit boards? Urls, catologues, packages, etc... Any
>information would be greatly appriciated.


>                                       Thanks,
>                                          N9XLT (David A. Wallace)
>                                          [e-mail]
>                                          Kokomo, In.



                 Opinions Expresses Are Entirely My Own.
             In Fact It Is Rare That Anybody Agrees With Me.

Mike Penner             |   "Firearms Stand Next In Importance To The
Lucent Technologies     |    Constitution Itself.  They Are The American
[e-mail]       |    People's Liberty Teeth."  George Washington



From [e-mail] Thu Jul 11 17:01:46 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Single Band HF Amplifiers
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ruavq$[e-mail]>
Date: Wed, 10 Jul 1996 15:21:08 GMT
Lines: 31

In article <4ruavq$[e-mail]> [e-mail] (AA8XC) writes:
>Back in the 60's or 70's the ARRL Handbook had a series of single band
>rack mounted HF amplifiers which shared only a common power supply.
>
>If anyone remembers these and which issue(s) they were in I'd appreciate
>being reminded. I had the book at one time but must have gotten rid of it
>years ago.

Jim, you'll find the project starting on page 194 of the 1962 Handbook.
Each single band amp uses a pair of 813s in parallel, with a link coupled
grid circuit and a Pi network output circuit. Filament and drive power
are switched to the active amplifier, HV, screen voltage, and bias are
maintained on all of them all the time from the common power supply.

I don't think much of the idea of switching filaments on with HV and
bias already present. 813s are tough old birds, but that's still abuse.
I'd consider a time delay relay in each RF deck that kept screen voltage
off the tubes until their filaments warmed up.

The author doesn't mention this (I guess he assumed everyone would
realize it), but the meters are hot in this design. They need to be
behind a protective insulating barrier. The picture shows the meter
panel recessed behind a glass window, and you should take care to
duplicate this safety feature.

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


From [e-mail] Thu Jul 11 17:01:47 1996
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From: [e-mail] (Larry Rothman)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.swap
Subject: Standard HX240U(AB) Programming info needed
Date: 8 Jul 1996 14:47:35 GMT
Organization: iSTAR Internet Inc.
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: ts22-16.tor.istar.ca
Xref: news2.epix.net rec.radio.amateur.equipment:30960 rec.radio.amateur.misc:105157 rec.radio.amateur.homebrew:16117 rec.radio.swap:70022

I have just acquired a couple of Standard Radio UHF handhelds
Model HX240U(AB) at a local hamfest. They display the letters CL
when turned-on. These are commercial HT's. No keypad, just 4 buttons
across the top of the front plus light and monitor buttons.

Any help with information (programming/manuals/etc) on these units
would be greatly appreciated.

Thanks,
Larry Rothman  VE3LRI
Toronto, Canada


From [e-mail] Thu Jul 11 17:01:48 1996
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From: [e-mail] (Larry Brantingham)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tools for voice synthesis
Date: 10 Jul 1996 16:33:59 GMT
Organization: Quadravox, Inc.
Lines: 15
Message-ID: <4s0m1n$[e-mail]>
NNTP-Posting-Host: legroom180.onramp.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

 A new WWW site (http://rampages.onramp.net/~qvox) describes a
low-cost software/hardware development tool for creating voice output
subsystems. Windows(tm) based acquisition, analysis and editing software, in
combination with a standard 16-bit sound card, codes and formats speech for
programmation into Texas Instrumemts TSP50P11 OTP speech synthesizer chips.
 We've been told that there might be some interest in amateur radio in a
custom voice output capability. See what you think!
Thanks.

Larry Brantingham
Quadravox, Inc
[e-mail]

1-214-669-4002



From [e-mail] Thu Jul 11 17:01:49 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (David Feldman)
Subject: Re: Tubes: Where To Buy ?
Message-ID: <[e-mail]>
Organization: Organization? Me?
References: <[e-mail]> <[e-mail]>
Date: Tue, 9 Jul 1996 14:39:09 GMT
Lines: 38
Sender: [e-mail]

In article <[e-mail]> Jay123a <[e-mail]
> writes:
>[e-mail] (Richard Harrison) wrote:
>>Hello:
>>
>>    Have on old Amp Supply LA-1000 amplifier that needs new tubes.
>>
>>    Tube(s, 4 of them) are marked 6MJ6/6LQ6/6JE6C.   Can anyone suggest
>>a place to purchase new ones at good prices ?
>>
>Hello Richard:
>
>These tubes in your amplifier use to plentiful because the TV industry
>used them as horizontal sweep tubes in their TV set designs. But not no
>more. So the good old days of 7 dollars each has long gone.
>
>Jay.

Hello Jay:

This problem comes up from time to time, and I tell people to consider
rewiring the amp for a 24V filament voltage (use a 24V 2A transformer)
and try a set of 24LQ6's, which are sold by antique electronic supply
for $8.50 or so each (not quite $7 but still a pretty good deal).
Alternatively, try 31LQ6's, and put the new 24V xfmr in series with the
existing 6V filament winding.

Either way, this lets you use tubes that are still plentiful and rather
cheap. I've been using a set of four ECG/Philips 31LQ6's in a Dentron
GLA-1000B for some time now and they work very well - they are the same
except for filmemt voltage and were very cheap (4.50 each) when I bought
them last year on sale.

Just remember to clearly mark the amplifier so someone in the future doesn't
plug (valuable/rare) 6LQ6's in and blow the filaments. A strategically
placed fuse would be cheap insurance.

73 Dave WB0GAZ [e-mail]



From [e-mail] Thu Jul 11 17:01:51 1996
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From: [e-mail] (gudmundur)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why difficult to generate high power at UHF?
Date: 6 Jul 1996 03:31:18 GMT
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In article <4rg6p0$[e-mail]>, [e-mail]
says...
>
>Here's a question that has been bothering me for a long time:
>
>Why is it that it becomes more difficult to generate RF power as we
>increase frequency?  Why do HF transceivers often have more power out
on
>80 meters than they do on 10?   Why is it so difficult to get lots of
>power out in the VHF and UHF ranges?
>
>TIA  73  Bill N2CQR/HI8
>
>
One of the main reasons is that even a small capacitance looks like a
short circuit at uhf.  If we try to use this capacitance as resonant
tuning it can help, but only to a small extent. The next reason is
electron transit time in the amplifier element (tube-transistor), it
becomes difficult to control electron flow so we then resort to
something like a klystron. How much power do you want? Even old
technology can make megawatts in the gigahertz range!



From [e-mail] Thu Jul 11 17:01:52 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Why difficult to generate high power at UHF?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4rg6p0$[e-mail]>
Date: Wed, 10 Jul 1996 14:35:47 GMT
Lines: 54

In article <4rg6p0$[e-mail]> Bill Meara <[e-mail]
.do> writes:
>Here's a question that has been bothering me for a long time:
>
>Why is it that it becomes more difficult to generate RF power as we
>increase frequency?  Why do HF transceivers often have more power out on
>80 meters than they do on 10?   Why is it so difficult to get lots of
>power out in the VHF and UHF ranges?

The device input and output capacitances present lower and lower
impedances as frequency increases. This effectively shunts signal
power, requiring more drive, and delivering less output power to
the load. Or looked at alternatively, the time constant for charging
and discharging the input capacitance becomes long with respect to
a cycle as frequency increases, the capacitance thus doesn't get
fully charged on each driving cycle, and less peak to peak gate
voltage is available to the active device as a result.

This assumes a constant impedance driving source. If you lower the
driving source impedance as frequency increases, you can reduce
the time constant of the gate circuit in step with increasing
frequency and maintain peak to peak drive voltage. There are
practical limits to how low a driving source impedance you can
use, however, so this only goes so far.

A similar thing happens on the output side, with the device having
to charge the output capacitance, and the load having to discharge
it, in the space of a cycle. The peak to peak output voltage falls,
and according to P=E^2/R, power output falls as well unless you
lower the load R in step with increasing frequency. Again there
are practical limits to how far you can go in that direction.

You can "tune out" the device capacitances with series inductance,
but this is inherently narrowband, and also can lead to instability
if you aren't careful due to phase shifts which may induce the
circuit to become an oscillator. The best thing you can do is select
devices with low input and output capacitance, but that means gate
area becomes very small at higher frequencies and you run into power
handling limits.

At very high frequencies, transit time of the majority carriers
becomes a factor. To minimize that, you want a very short channel,
but that also limits power handling (because it lowers the PIV
punch through limit). In some cases, you can take advantage of
transit time by using "slow wave structures", IE the principle
behind the traveling wave tube. You can even do that with solid
state devices using a circuit called a distributed amplifier. It
gets pretty complex pretty quickly, however.

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


From [e-mail] Mon Jul 15 17:03:57 1996
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From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: 15V too much for mobile radio?
Date: 13 Jul 1996 11:50:27 GMT
Organization: Netcom
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In <[e-mail]> [e-mail] (Brian
Ellsworth) writes:
>
>On 13 Jul 1996 01:31:04 -0400, [e-mail] (Garry P.
Adkins)
>wrote:
>
>>I recently found a 24VDC power supply  in my garage that
>>came from an old monitor.  I think I'm going to use it
>>to power a cheap little radio for base station use. (It's
>>a mobile radio, btw)
>>
>>I'm thinking along the lines of using one of the TO-220 case
>>voltage regulator (maybe adding some big caps for ripple)
>>to bring the 24V down to 12 or 15 volts.
>
>Hmm, let's see. 24 VDC on the source, 1.5 amps, and 15 vdc out, and a
to-220
>case egh? I'd start saving for a nice service manual on that radio if
i were
>you. When that regulator blows from the 14 watts you attempted to
dissipate it
>may fail shorted and put 24 volts into your mobile. Either that or
plan on some
>pretty fancy cooling system for that puppy, it's going to get
screaming warm.

Include a dropping resistor between the supply and the regulator to
minimize the voltage drop (and subsequent power dissipation) across the
regulator.

- Jeff, WA6AHL


From [e-mail] Mon Jul 15 17:03:58 1996
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From: [e-mail] (Garry P. Adkins)
Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: 15V too much for mobile radio?
Date: 13 Jul 1996 01:31:04 -0400
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Hi!

I recently found a 24VDC power supply  in my garage that
came from an old monitor.  I think I'm going to use it
to power a cheap little radio for base station use. (It's
a mobile radio, btw)

I'm thinking along the lines of using one of the TO-220 case
voltage regulator (maybe adding some big caps for ripple)
to bring the 24V down to 12 or 15 volts.  My concern is that
12V may not be sufficient for full power transmit since the
radio expects 13.8.  (The radio only pulls 1.5A at max
modulation, so it doesn't need a ton of juice)

There is a very common 15v regulator available, would that
be too far above the 13.8?  I'm not aware of any 13.8v
parts.

Any help much appriciated!

--
------------------------------------------------------------------------
It is dangerous to be right when the government is wrong.
                     --Voltaire
------------------------------------------------------------------------
Garry Adkins                             [e-mail]
USnail: 712 Chestnut St.                 BELLNet:  [phone]
        Kenova, WV 25530-1511


From [e-mail] Mon Jul 15 17:03:59 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM Modulating Tube Finals With Solid State Audio Amps
Date: Sat, 13 Jul 1996 15:24:46 +0100
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Jeff Duntemann wrote:
>Here's a notion I had a long time ago and haven't gotten around to
>trying...
>
>AM Modulation transformers are really rough to find these days, but
>the thriving tube audio business provides audio output transformers to
>match nearly any tube output impedence to an 8-ohm load, at almost any
>power level you'd care to try.
>
>Now...turn that around: Could we generate audio power with one of
>these solid state audio amp modules (say 20-50 watts) and pipe the
>audio into the 8-ohm side of one of those output transformers, and
>then use the other side as the modulating output in series with the
>plate of a Class C tube final like a 6146B?
>
>Every solid-state audio power amp IC or module I've seen works into
>either 4 or 8 ohms.  I can't see why we couldn't use an output
>transformer "backwards" to generate audio power at the impedence a
>tube final like a 6146 or 811A would like.
>
>I LOVE the audio quality of plate-modulated AM, and this would imply
>an easy way to make a good quality 50-100W AM transmitter without
>having to grub for a used modulation transformer.
>
>Has anybody tried this?  Are there any nonobvious gotchas I haven't
>thought of yet?
>

'Fraid so. The core of a modulation transformer is designed to carry the
DC current to the PA, which an ordinary AF output transformer isn't.

I guess it could work, but you'd need to under-run the transformer very
considerably from its normal audio rating, to avoid core saturation.
Using an AF transformer with a higher power rating would also help with
any possible insulation problems.


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


From [e-mail] Mon Jul 15 17:04:00 1996
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From: Danny Williams <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: cell phone conversion
Date: Sat, 13 Jul 1996 16:39:16 -0500
Organization: Flashnet Communications
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Has anyone considered on done a conversion of an old cellular phone to a
900 mhz. ham tranceiver?  Any thoughts or comments appreciated.
Danny
KB5WER


From [e-mail] Mon Jul 15 17:04:01 1996
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From: Butch Magee <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FT-2200 Mod
Date: Thu, 11 Jul 1996 10:27:34 -0500
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Does anyone have, or know where to get, the mod/mods for the Yaesu
FT-2200?

Butch KF5DE


From [e-mail] Mon Jul 15 17:04:02 1996
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From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Gerber file viewer ?
Date: 11 Jul 1996 09:34:08 -0700
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In article <[e-mail]>,
 <[e-mail]> wrote:
>Can anyone knowledgeable in pc board CAD drawing point me to
>a decent shareware Gerber file viewer ?
>The one I have now is quite crude...it shows all lines as the same
>regardless of their thickness.  The program is okay for checking
>general connectivity and placement but not so great with detail.
>I'd like to see if there is something better out there.
>I would consider commercial software too if the price is reasonable.
>
>(The schematic/pc board package I use shows multi-layers in x-ray
>perspective rather than mirrored images as you would see it by flipping
>the board.  A gerber viewer really helps to see what the board will
>really look like from the plots.)
>
>Many thanks !
>
>Hugh Duff  VA3TO  Toronto
>
>
>
>---
> ■ NFX v1.3 [000]
>

The CAD package I use, Protel, has a built in Gerber viewer.  I know
there are some shareware viewers out there.  You might try the Simtel
archive (ftp: oak.oakland.edu) or posting your question to
sci.electronics.cad.  You might find some good answers there.

Good Luck

Steve Muther WF6R




From [e-mail] Mon Jul 15 17:04:03 1996
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From: [e-mail] (Jim Moore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Glue for base of tubes..
Date: Thu, 11 Jul 96 03:24:04 -0800
Organization: Calif State University, Fresno
Lines: 14
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You will have trouble with epoxy in the tube environment.  Just look at any of
those old television sets that tried to put tube sockets directly on pc
boards.  The major problem is heat.  Tubes, a.k.a. themionic emitting devices,
operate at substantially elevated temperatures.  I think that you will find
that epoxy is not much good over 200 degrees.

I am sorry that I can't make any recommendations for bonding products that
have high temperature and high dialectric properties.

Maybe a tube manufacturer might have a suggestions.

Good luck.  Jim




From [e-mail] Mon Jul 15 17:04:04 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Good CB to Convert to 10m FM?
Date: Sun, 14 Jul 96 13:45:56 GMT
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On 6/23/96 1:07PM, in message <[e-mail]>,
[e-mail] wrote:

> Mark Schoonover - KA6WKE wrote:
>
> > I'm looking for a CB that would be relatively easy to convert to
> > 10m FM. I have the usual equipment, etc. This would be my first
> > attempt and I don't know much about the different CB gear available.
>
> I have used all three on 10 FM, converted CB's convert commercial rigs, and
> radios
> designed for 10FM.  Converted CB's are the worse & a waste of a good radio.
>
> Go get a old Mortac or Mastr Pro & use that.  CB's have poor IF sections &
> low
> power.  Leave the CB on it's intended freqs where it canbe of good use.
Don`t listen to those guys. Obviously, they have never tried it. Get yourself
a
good Cobra 148 or Uniden Grant XL. These are easy to modify for 10M, just
change the xtal and re-tune the vco, mixer and RF coils. The Cobra 148 and
Grant have Excellent double - conversion recievers. Like I said, don`t listen
to the know-nothings.
Louie
N1CSS



From [e-mail] Mon Jul 15 17:04:05 1996
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From: [e-mail] (Chris Elmquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: helical before or after GaAsFET in preamp ?
Date: 11 Jul 1996 15:15:31 -0500
Organization: The Basement of N0JCF
Lines: 20
Message-ID: <4s3nd3$[e-mail]>
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I am interested in playing with some of these TOKO helical
filters for 2m, 222 and 432 in conjuction with some GaAsFET
preamps.  I have a commercially built preamp (AMPIRE) that
has the helical filter AFTER the GaAsFET...  this seems cool
since it probably doesn't contribute much to the noise figure
this way...  but I'm wondering what other tradeoffs there are
to this method as opposed to putting the helical ahead of the
GaAsFET.  Putting it ahead would obviously add to the noise
figure and put about 6dB of loss before the GaAsFET as well...

Where do guys like SSB Electronics put the helicals in their
helically filtered preamps ?

Any comments greatly appreciated.

73, Chris
--
Chris Elmquist, N0JCF
[e-mail]
[e-mail]


From [e-mail] Mon Jul 15 17:04:08 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrew Meter
Date: 12 Jul 1996 05:11:53 -0400
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Hi Bob,

I used to be Engineering Manager at a company that made meters (among
other things).

In article <[e-mail]>, Bob Mueller
<[e-mail]> writes:
>
>Because it may not be too well known, I point out that the scales of
meter
>movements are not very linear.

I wonder waht type of accuracy your are reffering to? We manufactured
meters that were within 1% at full scale and half when calibrated at 3/4
scale. At 3/4 scale they were dead on at room temperature.

Let's assume we have a conventional 1% FS meter reading 1000 uA (one mA).
The net error at any point of the scale would be less than 10 uA. If
pickets were placed every degree on a 100 degree movement, the maximum
error would be one picket anywhere on the face of the meter. If the scale
arc was three inches long, the pickets would be around .03 inches apart.
If the pointer of the meter was .05 inches from the scale, parallax would
be a bigger problem than metering error.

>The scales of good movements are individually
>matched or drawn.   I know of one important manufacturer that had several
>versions of scales already printed  and selected the one fitting to
within
>the
>specified accuracy.  Hewlett- Packard    did (and probably still does)
>calibrate its precision meters individually with a computer controlled
scale
>drawing machine (it was done photographically in the past but might be
>handled
>by LASER printing today, or something of that sort.)

We only did that if the scale was a large mirrored scale. Without a very
large mirrored scale, errors caused by the person's method of reading the
scale dominated the error. Perhaps HP was compensating for circuit
variations (such as non-linearity in a RF detector) rater than actual
meter variations?  If it was actual meter variations, the meter
manufacturer would be the one changing the scale, not H-P.

We did that in 7 inch mirrored scale 1/2 percent meters.

>      Just dividing a new scale into uniformly spaced arcs is likely to
lead
>to
>some errors, though I will hazard no guess how big these will be. If I
>needed
>accuracy I would make a linear scale, mount it, and feed the meter
accurate
>currents.

That's very true. The characteristics of the movement vary with the
construction of the "magnetic window" surrounding the motor coil. While
good quality movements track very closely from meter to meter in
production, you shouldn't do a scale on a movement you've never plotted
before by measuring FS and dividing the scale into equal divisions.

1% of FS is easy to do in production without custom selecting each scale,
and 1/2 percent is possible. Scales less than 1/2 percent require either
custom plotting or tight control of components that control the flux
density in the area of the motor. A 1/2 percent meter requires many
hundreds of pickets and a large mirrored scale to be useful, the error
would be a maximum of 5 microamperes on a 1000 uA (1 mA) meter WITHOUT
using a custom scale for each movement.

73 Tom


From [e-mail] Mon Jul 15 17:04:09 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrew Meter
Date: 11 Jul 1996 17:03:59 -0400
Organization: America Online, Inc. (1-800-827-6364)
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In article <4s3km2$[e-mail]>, [e-mail]
(TIEMANN BRUCE) writes:

>
>They also usually, irritatingly, depend on the angle of the face with
>respect to gravity.  Unless the thing is perfectly balanced, which even
>fairly nice, commercial meters aren't, gravity pulls "down" on the
needle,
>which results in low readings when the needle is less than half scale,
and
>high readings when the needle is past half scale, and having a smoothly
>varying sine-like dependence of error on needle angle.

Test the meter this way....

Lay the pointer flat and zero it with the regulator (zero adjust).

Hold the meter so the pointer is vertical.

Hold the meter so the pointer is horizontal.

It the pointer remained on zero the movement is properly balanced.

If the meter isn't balanced, it was a crummy job or a cheap meter.

Precision meters are ALWAYS balanced (unless someone isn't doing their
job) and free from gravity induced errors. They are balanced by sliding
little coiled weights in and out (they are at 90, 180, and 270 degrees in
reference to the pointer), and using temperature reflowable glue to retain
them in place. Fine tuning is done by tweeking the angle of the weights
just slightly or adding a tiny dot of glue.

This error also is reduced by increasing meter torque. Assuming all the
resistance is in the moving coil, a 1 mA 1000 ohm meter is much less
sensitive to balance than a 50 uA 50 ohm meter. With high torque meters,
balancing is much less critical.

More important than any of this are effects of a steel panel. Be sure the
meter is used in the type of environment it was specified to be used in.

73 Tom


From [e-mail] Mon Jul 15 17:04:09 1996
Path: news2.epix.net!uunet!in2.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Peter L. Williamson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematic for pro-2023 scanner
Date: 13 Jul 96 12:17:08 GMT
Organization: ucsd usenet gateway
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hello, I am looking for some service information on the Tandy (Radio Shack)
scanner model pro-2023. A schematic and /or pcb layout would be most
appreciated.

Peter L. Williamson
VK4AWP. [e-mail]



From [e-mail] Mon Jul 15 17:04:10 1996
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From: Tom Lewis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Where is Borg Electronics?
Date: 13 Jul 1996 21:49:04 GMT
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Does anyone know how I can get in touch with "Borg Instruments"?

Any help would be appreciated.

(((73!)))
Tom Lewis - AB5CK



From [e-mail] Sun Jul 21 18:53:18 1996
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From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: 15V too much for mobile radio?
Date: 15 Jul 1996 20:51:36 -0700
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In article <4sck1l$[e-mail]>,
[e-mail] (Garry P. Adkins) wrote:
> >Yes I would vote that 15 volts is a bit high for your radio.
>
> Hi!
>
> I ran some tests this afternoon with my DMM.  I connected the DMM
> to a lighter plug and then drove around and watched the voltage.
>
> Here's what I saw:
>
> Started out at 12.8v before starting the car
>
> Started the car, and it jumped to 14.8 for several seconds then
> settled down to 14.6 for about 2 minutes.
>
> As I drove over the next 10 minutes, it slowly creeped down
> to 14.2 where it stayed.  (at least until I quit watching
> the meter and started watching the road!)
>
> FWIW, the car is a 92 Explorer.
>
> Garry
>
>

Years ago (> 10+ years?) I read that it is quite possible to get
transient spikes up to 80-90 V.  Modern vehicular electrical
system might do better.  However, if you know that in some aspects
the specifications for vehicular electronics system is more
stringent that Mil Spec, you might get worried.  Any one with some
facts to fill in?

73,

---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'
Remembering: KE6LTH, KD6HNU, March 22, 1996


From [e-mail] Sun Jul 21 18:53:19 1996
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From: [e-mail] (Gary Coffman)
Subject: Re: 15V too much for mobile radio?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4s7cao$[e-mail]> <[e-mail]> <4sck1l$[e-mail]> <[e-mail]>
Date: Tue, 16 Jul 1996 12:50:42 GMT
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In article <[e-mail]> [e-mail] (Alfred Lee) writes:
>
>Years ago (> 10+ years?) I read that it is quite possible to get
>transient spikes up to 80-90 V.  Modern vehicular electrical
>system might do better.  However, if you know that in some aspects
>the specifications for vehicular electronics system is more
>stringent that Mil Spec, you might get worried.  Any one with some
>facts to fill in?

The vehicle power buss is very dirty. During starting, transients
of 300 volts are not uncommon. Any time an inductive load switches
on or off (a fan motor for example), there will be a nasty spike.
Any electronics used in a vehicle needs suppressors to protect it
from these spikes and surges. That's normally built into equipment
designed to operate in the auto environment. But if you build something
yourself to put in the car, make sure you use adequate suppression
and filtering.

It is also normal for the vehicle electrical buss to vary from as
low as 10.5 volts to as high as 14.8 volts during normal operation.
So use of regulation is highly recomended for equipment which won't
tolerate fairly wide voltage swings. Once the alternator has recharged
the battery from the starting drain, the voltage will normally stay
in the range of 13.8-14.2 volts on the vehicle buss. But during peak
charging, voltage will rise to 14.8 volts, and if you run equipment
with the engine off, the battery can go down to 10.5 volts as it
nears the point where it is so discharged that it won't start the
car. (You should never let a car battery discharge below 10.5 volts
or you'll shorten its life.)

A number of ham rigs get *real* squirrelly when the voltage drops
below 11 volts. You can get that at the rear terminals of the radio
even with the battery at full charge if you have significant resistance
in the wiring to the radio. 1.3 ohms will drop 1 volt for each ampere
of draw. With a radio requiring 10 amps, you could wind up with nearly
zero volts at the back of the equipment if the resistance of the total
wiring between the battery and the radio were only an ohm. You want
wiring that has a total resistance in the 1/100ths of an ohm range.
Use heavy cables and good connectors.

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


From [e-mail] Sun Jul 21 18:53:22 1996
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From: [e-mail] (A.R. Duell)
Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: 15V too much for mobile radio?
Date: 16 Jul 1996 14:43:58 GMT
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Mike Willis <[e-mail]> writes:
[...]
>> I finally discovered that the switch-on current of the streamer was
>> enough to cause the output pin of the regulator to be below 9V for a
>> significant time after power-up. Thus, the output was more negative than
>> the common pin, which caused the 78S15 to go into shutdown mode. I
>> finally cured it by connecting a capacitor of a few 10's of uF across the
>> zener to give a 'soft start'. It now works fine...

>How about removing the resistor alltogether and using the regulator
>bias current to (a few 10s of mA) to provide the drop across the zener.

_Some_ of the lower-current regulators don't provide enough bias current
to let the zener stabilise. I was caught by that once as well, and now
prefer to include a resistor if possible. The extra cost of the resistor
and soft-start capacitor is minimal, and it ensures that the design is
reliable.

>A couple of 0.1uF capacitors between input and common and output and
>common on the regulator to avoid instability.

Agreed. I did include them (well, 0.22uF actually), but I didn't put them
on the ASCII-art schematic as I though they were 'obvious'.

>I have used an LED for the zener, with a 12V regulator you get 13.9V and
>an "ON" indicator.

I like that. I assume it must be a red LED to drop 1.8V

>Mike

--
-tony
[e-mail]
The gates in my computer are AND,OR and NOT, not Bill


From [e-mail] Sun Jul 21 18:53:23 1996
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From: [e-mail] (Gary Coffman)
Subject: Re: 15V too much for mobile radio?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4s7cao$[e-mail]> <[e-mail]> <4se7qs$[e-mail]>
Date: Tue, 16 Jul 1996 14:24:37 GMT
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In article <4se7qs$[e-mail]> [e-mail] (A.R. Duell) wr
ites:
>[e-mail] (Gary Coffman) writes:
>>Note that the regulator will have to drop 10.2 volts to get from
>>24 to 13.8 volts. At 1.5 amps, that's about 16 watts. Heatsink it
>>very well. A TO-3 cased regulator might be a better choice (again
>>use a mounting kit, you can't ground the case). The added diodes
>>need to be rated for the current as well.
>
>If you're using diodes or zeners to 'jack up' a regulator, they only
>carry the (low) current needed by the regulator itself, not the load
>current. They don't need to be highly rated.

Yeah, that's right. For some reason I was thinking the regulator
was a shunt regulator. It isn't, of course. It's a series pass
design. So the main current goes from input to output, and very
little flows through the reference pin, probably only a couple
of mils.

I've thought of another thing too. Most of the TO-220 3 terminal
regulators can only handle 1 amp. This application needs more
current. A solution to that, at the cost of another 0.6 volt,
can be had by having the regulator drive the base of a series
pass transistor like a 2N3055. Then the regulator transistor
handles the heavy current and the 3 terminal regulator only has
to handle the output current divided by the beta of the 2N3055,
or about 50 times less. The downside is you lose the overcurrent
shutdown feature of the 3 terminal regulator when you do this.
In this application, a fast fuse should substitute nicely, but
another transistor could be added to starve base current to
the 2N3055 during overcurrent periods.

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


From [e-mail] Sun Jul 21 18:53:24 1996
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From: KD1YV <[e-mail]>
Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: 15V too much for mobile radio?
Date: Wed, 17 Jul 1996 21:51:53 -0300
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Gary Coffman wrote:
>
> In article <[e-mail]> [e-mail] (Alfred Lee) writes
:
> >
> >Years ago (> 10+ years?) I read that it is quite possible to get
> >transient spikes up to 80-90 V.  Modern vehicular electrical
> >system might do better.  However, if you know that in some aspects
> >the specifications for vehicular electronics system is more
> >stringent that Mil Spec, you might get worried.  Any one with some
> >facts to fill in?
>
> The vehicle power buss is very dirty. During starting, transients
> of 300 volts are not uncommon. Any time an inductive load switches
> on or off (a fan motor for example), there will be a nasty spike.
> Any electronics used in a vehicle needs suppressors to protect it
> from these spikes and surges. That's normally built into equipment
> designed to operate in the auto environment. But if you build something
> yourself to put in the car, make sure you use adequate suppression
> and filtering.

I totally agree.  The first wiper-delay I built and installed in my '74 Chevy
Nova
worked perfectly.  The second, using the identical circuit, installed in an '8
0 Chevy
Malibu was flaky as hell.  Turned out that the windshield-wiper motor, when it
 shut off,
was spiking the buss with a huge, negative-going pulse (it blanked my scope ev
en on it's
highest voltage setting, 100V I think.)

That was a low-draw circuit, just a 555 and relay, so I build a simple L-C low
-pass
filter to clean it up.  Neither the L nor the C by itself was enough.

Now my question is, with a high draw device such as a transmitter, is there a
simple,
passive filter that will accomplish the goal?  Seems like the series inductor
would have
to use some pretty hefty gauge wire.

73 de Jim, KD1YV


From [e-mail] Sun Jul 21 18:53:25 1996
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From: [e-mail] (Bill Sheehan)
Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: 15V too much for mobile radio?
Date: Wed, 17 Jul 1996 21:01:44 GMT
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[e-mail] (Brian Ellsworth) wrote:

>On 13 Jul 1996 01:31:04 -0400, [e-mail] (Garry P. Adkins)
>wrote:
>

>Hmm, let's see. 24 VDC on the source, 1.5 amps, and 15 vdc out, and a to-220
>case egh? I'd start saving for a nice service manual on that radio if i were
>you. When that regulator blows from the 14 watts you attempted to dissipate i
t
>may fail shorted and put 24 volts into your mobile. Either that or plan on so
me
>pretty fancy cooling system for that puppy, it's going to get screaming warm.
>
Shows what you know. Ya big dummy. If you drill a hole in the side of
your freezer to run the cords out of, you can put the whole damn power
supply in the freezer. Voiler!!! Your heat problem is solved!!

Sincerely,
Red Greene



From [e-mail] Sun Jul 21 18:53:26 1996
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From: [e-mail] (Mike Capone)
Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: 15V too much for mobile radio?
Date: Wed, 17 Jul 1996 17:17:23 GMT
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On 13 Jul 1996 17:45:03 -0400, [e-mail] (Garry P. Adkins)
wrote:

:>>There is a very common 15v regulator available, would that
:>>be too far above the 13.8?  I'm not aware of any 13.8v
:>>parts.
:>
:>
:>Through my experience, I would say your fine either way... 12V and
:>13.8V have pretty much become interchangable without a problem.
:>and if you have a tolerance of 1.8V, and there is no problem, then
:>15V should be no problem as well, after all, it's less of a difference
:>than 12 and 13.8...  As long as you're in the ballpark you should
:>be ok.  Just don't attempt 24V. :)
:
:Agreed.  I've been wondering... How close to dead-on is a car's
:13.8?  I bet at low rpm, it gets a bit low...  How about on the high
:side?  Does it ever get up to 15vdc?
:
:I'll have to plug my dmm into the cig lighter and watch it on a few
:trips to see what happens.
:
I dunno about you- but most the cars I get into have about 14.5V on the plug
while running.




From [e-mail] Sun Jul 21 18:53:27 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!uunet!in2.uu.net!news3.agis.net!agis!NEWS!not-for-mail
From: Bob Lewis <[e-mail]>
Subject: Re: 900 Mhz boost?
Message-ID: <[e-mail]>
Date: Sun, 14 Jul 1996 21:11:12 -0400
References: <4s12rk$[e-mail]>
Organization: AA4PB
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Kristen Maaherra wrote:
>
> I live ruraly, and if I could get my 900Mhz phone to go a little farther wou
ld
> have internet access!!!!!  Any pro's out there give me some advice on 900 Mh
z
> antenna design or bower boost?
>
> Thanks,
> You can e-mail me '[e-mail]' of reply here...Adding and antenna or boos
ting the power is illegal as the phone will no
longer meet FCC specs.



From [e-mail] Sun Jul 21 18:53:28 1996
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From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: AM Modulating Tube Finals With Solid State Audio Amps
Date: 16 Jul 96 18:02:41 GMT
Organization: ucsd usenet gateway
Lines: 37
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

  Why not try the following circuit to balance out the DC current in the
transformer.



     Modulation                      PLATE
     (AF power amp)______      _______|
                         s    .p
                  6.3v   E     R    115 VOLT PRIMARY #1
                         C     I
                        gnd    M     FILTERED HV
                               --------|________
                               --------|       |
                               P             -----   FILTER CAP
                               R             -----
                               I  115 VOLT     |
                             . M  PRIMARY #2  GND
        HV SUPPLY _____________|



THE DC CURRENT WILL BALANCE OUT. AND YOU ALSO GET SOME ADDITIONAL
FILTERING OF HV. THE DOTS INDICATE THE PHASE OF THE SECONDARIES.
  THERE SHOULD BE VERY LITTLE RIPPLE CURRENT IN THE PRIMARY
IF IT HAS SUFFICIENT INDUCTANCE.
  NEVER TRIED AN EMAIL BEFORE.

73
BILL


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





From [e-mail] Sun Jul 21 18:53:29 1996
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From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM Modulating Tube Finals With Solid State Audio Amps
Date: 15 Jul 1996 17:58:27 GMT
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Ian White, G3SEK ([e-mail]) wrote:
: Jeff Duntemann wrote:
: >Now...turn that around: Could we generate audio power with one of
: >these solid state audio amp modules (say 20-50 watts) and pipe the
: >audio into the 8-ohm side of one of those output transformers, and
: >then use the other side as the modulating output in series with the
: >plate of a Class C tube final like a 6146B?

..

: >Has anybody tried this?  Are there any nonobvious gotchas I haven't
: >thought of yet?
: >

: 'Fraid so. The core of a modulation transformer is designed to carry the
: DC current to the PA, which an ordinary AF output transformer isn't.

: I guess it could work, but you'd need to under-run the transformer very
: considerably from its normal audio rating, to avoid core saturation.
: Using an AF transformer with a higher power rating would also help with
: any possible insulation problems.


The way that old plate-modulated AM broadcast transmitters worked was to
avoid running the DC through the modulation transformer; I imagine it
helped a lot in achieving low distortion levels.  You run the DC through a
good audio choke, and couple the modulation transformer to the RF_PA end of
the choke with a capacitor.  This also removes DC from the transformer
"secondary" so there would be less liklihood of any insulation problems,
but there really weren't any anyway, since the transformer was designed to
have the "secondary" (originally primary) driven by plate voltage plus
audio anyway.   Finding an appropriate choke (and capacitor) might be some
fun.  They were often the largest components in an AM broadcast
transmitter, larger than the power transformer and filter caps and choke.

Solid state amplifiers typically don't care _very_ much (compared with
tube amps) about what load impedance they see, so long as you don't
exceed their current capability; but it would be fairly important to use
a design that really could put out the power.  Typical audio power in a
hi-fi system is much below the peak power the amplifier is capable of,
and you'd want to make sure the design (including things like heat
sinking) was appropriate for the average and peak power you'd need for
modulation.

--
Cheers, Tom
[e-mail]


From [e-mail] Sun Jul 21 18:53:30 1996
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From: [e-mail] (Richard Hosking)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM Modulating Tube Finals With Solid State Audio Amps
Date: Thu, 18 Jul 1996 13:33:50 GMT
Organization: iiNet Technologies Pty Ltd
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[e-mail] (Jeff Duntemann) wrote:

>Here's a notion I had a long time ago and haven't gotten around to
>trying...

Jeff
What about trying a pulse width modulation system which is what the
commercial AM stations do nowadays.(so I understand)  The audio is
converted to a digital signal of pulses (at say 100KHz) with width
proportional to the audio voltage. These drive a high voltage FET
switching the plate voltage.  The FET is follwed by a suitable low
pass filter to get rid of the 100 KHz sidebands.
(I must admit I havent done this however)
I have a hankering to get on 80 metres AM...

Richard

VK6BRO
[e-mail]
http://www.iinet.net.au/~richardh



From [e-mail] Sun Jul 21 18:53:31 1996
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From: [e-mail] (Doug Thomson)
Newsgroups: rec.radio.amateur.homebrew
Subject: AM Modulation with SS Amps.
Date: 19 Jul 96 13:35:17 GMT
Organization: ucsd usenet gateway
Lines: 18
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NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

 I have done this using a filament power transformer run backwards. A
5.0 V secondary filament X-former with a 120 V pri, has a turns ratio
of approx. 24 to 1. Now runing it backswards and feeding the output
of a solid state amp @ 8 ohms gives an output impedance of 4.6 K
(the square of the turns ratio times the pri impedance). A 6146
running at 750 v and 150 ma needs a 5K laod, pretty close. If the
filament X-former is rated at 4A secondary, the pri current is 166
ma. Using a power x-former allows for load current to follow without
saturating the core. The frequency response is not very good, the
power x- former was designed to run at 60Hz, but I found that most x-
former gave 2+ Khz top end, plenty good for AM, as a mater of fact
the bandwidth need to be limited from the SS bandwidth of greater than
20 Khz.
 Hope this helps. 73s

  Douglas K. Thomson, KB4OQO
  E-mail: [e-mail]



From [e-mail] Sun Jul 21 18:53:32 1996
Path: news2.epix.net!uunet!inXS.uu.net!nntp.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e2a.gnn.com!pop.gnn.com!k1epj
From: [e-mail] (DAVID R LEDUC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Antenna for 2 Meters
Date: Fri, 19 Jul 1996 21:23:23
Organization: GNN
Lines: 9
Message-ID: <4soucp$[e-mail]>
NNTP-Posting-Host: 70-137.client.gnn.com
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
X-GNN-NewsServer-Posting-Date: 19 Jul 1996 21:23:37 GMT
X-Mailer: GNNmessenger 1.3

        I'm waiting for the UPS truck to arrive with my DR-1200 and
        KPC-3 and trying to decide what I should put up for an antenna.
        The closest BBS is 5 miles away and the closest DX packet cluster
        is about 20 miles away.
        I have quite a bit of experience with building HF antennas but zero
        experience with VHF. Anyone have any suggestions?
        Thanks
        Dave LeDuc K1EPJ



From [e-mail] Sun Jul 21 18:53:33 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!gatech!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!nntp.coast.net!news-res.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: B&W Coil Stock Supplier
Date: 18 Jul 1996 07:45:38 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <4sl852$[e-mail]>
References: <4se5tb$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4se5tb$[e-mail]>, Cecil Moore
<[e-mail]> writes:

>
>Surplus Sales of Nebraska advertises such in QST. [phone]
>
>73, Cecil, W6RCA, OOTC  (not speaking for my employer)

Ameritron also stocks some sizes at a more reasonable price.

Surplus Sales must have high overhead.

73 Tom


From [e-mail] Sun Jul 21 18:53:34 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.net66.com!jolt.pagesat.net!ossi.com!newsfeed1.aimnet.com!nntp.primenet.com!news.cais.net!hunter.premier.net!newsfeed.internetmci.com!news.sprintlink.net!news-stk-200.sprintlink.net!itnews.sc.intel.com!news
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: B&W Coil Stock Supplier
Date: Thu, 18 Jul 1996 08:03:51 -0700
Organization: Intel Corp., Chandler, AZ
Lines: 9
Message-ID: <[e-mail]>
References: <4se5tb$[e-mail]> <4sl852$[e-mail]>
NNTP-Posting-Host: cmoore.ch.intel.com
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W8JI Tom wrote:

> Ameritron also stocks some sizes at a more reasonable price.

Hi Tim, what diameter, wire size, TPI, and inductance would you
recommend for the loading coil in an elongated 75m mobile antenna
with lots of top hat capacitance?

thanks and 73, Cecil, W6RCA, OOTC  (not speaking for my employer)


From [e-mail] Sun Jul 21 18:53:34 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!portal.gmu.edu!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Ronaldo Reis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Brazil Ham radio
Date: 17 Jul 96 14:32:59 GMT
Organization: Natal City (Brazil)
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Natal City, Brazil, July/96

Hi my friend:

Please, call on and divulge the BRAZIL HAM PAGE, in the
following URL:

   http://www.digi.com.br/users/brazil/ps7ab.html

The page is in english and portuguese, and my intent is to
provide a safe site to access a wide variety of information
about Radioamateur and SWL in Brazil.

Mny tnks, 73.

PS7AB, Rony.
[e-mail]


From [e-mail] Sun Jul 21 18:53:35 1996
Path: news2.epix.net!uunet!inXS.uu.net!ott.istar!istar.net!tor.istar!east.istar!news
From: Shawn Kubik <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: buidling a transmiter
Date: Thu, 18 Jul 1996 18:52:39 -0700
Organization: The Web Creation People
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: burgessville-138.oxford.net
Mime-Version: 1.0
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X-Mailer: Mozilla 3.0b5a (Win16; I)

I am looking for plans to build a FM Transmiter.  I realy what plans for
a transmiter no mater how big or small


thanks


From [e-mail] Sun Jul 21 18:53:36 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.clark.net!mr.net!chi-news.cic.net!cs.utexas.edu!math.ohio-state.edu!uwm.edu!news-res.gsl.net!news.gsl.net!hunter.premier.net!uunet!inXS.uu.net!news.nkn.net!dfw.nkn.net!news.startext.net!news
From: Leslie Guinn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: cb to 10 meter
Date: Sat, 20 Jul 1996 14:52:20 -0700
Organization: StarText department of the Fort Worth Star Telegram
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: dial2-17.startext.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I)

how do you convert a cb to 10 meter. I have an old realistic 23-plus cb
i would like to convert

Thanks

Leslie....




From [e-mail] Sun Jul 21 18:53:37 1996
Path: news2.epix.net!uunet!in2.uu.net!comp.vuw.ac.nz!topnz.ac.nz!news
From: Jim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: cell phone conversion
Date: Thu, 18 Jul 1996 01:09:44 -0700
Organization: The Open Polytechnic of New Zealand
Lines: 27
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: dial271139.topnz.ac.nz
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.01 (Win16; I)

Michael Herring wrote:
>
> Danny Williams wrote:
> >
> > Has anyone considered on done a conversion of an old cellular phone to a
> > 900 mhz. ham tranceiver?  Any thoughts or comments appreciated.
> > Danny
> > KB5WER
> I have.  I have a friend who has.  I'm working on it here.
> 73
> de ke4rgyMichael.

I have read the above with interest.

It seems possible to poke the right numbers into the phone to get the
right frequencies, but how do you adjust the filters at the antenna end
to bring the sets out of the phone band and into the ham bend?

You just about wreck them extracting them and pulling them apart, and
then you have to trim the metallisation to pull the filters over to the
right frequencies.

Perhaps you can purchase replacement filters???

73,
[e-mail]
ZL2APE@ZL2WA.#60.NZL.OC


From [e-mail] Sun Jul 21 18:53:38 1996
Path: news2.epix.net!uunet!in2.uu.net!news.iag.net!newsfeeder.sdsu.edu!newspump.sol.net!daily-planet.execpc.com!net.digalogsys.com!rick
From: Rick Miller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Cheap Rig for New Tech-Plus?
Date: Mon, 15 Jul 1996 09:31:17 -0500
Organization: Exec-PC BBS - Milwaukee, WI
Lines: 28
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: deneb.execpc.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Hi!

I finally got back into ham radio by getting my Tech-plus license this
weekend!  I was tired of kicking myself in the pants for letting the
license I got when I was 12 years old expire.  :-)  With Navy morse
training and an Electrical Engineering education, it was a *breeze*!
I'll probably upgrade later this year, my testing being limited by
the 4-year-old son I had along and the wife waiting impatiently for
me to come home.

So here I am, a new Tech-plus without a rig.  I'd like to build something
simple (and *dirt* *cheap*) that I can operate until I can scrape up
enough "mad-money" to buy a 2-meter handheld.  CW-only is *fine*.
I even still have the straight key I got when I was twelve, in good
condition too.

Does anyone have any suggestions where I might find easy-n-cheap
plans or kits?  I just want to be able to get on the air *somehow*
until my hobby fund can afford something nicer.

(Any response from anyone familiar with Milwaukee-area repeaters
 would be *doubly* appreciated!)

Rick Miller (test passed, call unknown)
--------------------------------------------------------------------------
Raportisto demandis de Mahatma Gandhi, "Sr-o. Gandhi, kio vi pensas pri
Okcidenta Civilizacio?"  Li respondis, "Mi pensas ke gxi estus bona ideo."



From [e-mail] Sun Jul 21 18:53:39 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: crystal radio
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sun, 14 Jul 1996 20:50:16 GMT
Lines: 41

In article <[e-mail]> Shimon Hirschhorn <[e-mail]> writ
es:
>A couple of weeks ago I bought my eight year old a crystal radio kit.
>He loved building it.  The problem is the reception is terrible.  I
>fixed him up a ground plug that plugs in to the ground of the electric
>socket, and a antenna that attaches into the cable radio antenea.  The
>reception is still terrible.  He recieves all the stations at once.  I
>saw the message thread on the razor blade radio, and we are going to
>give it a try.

The only selectivity a classic crystal set has is the loaded resonance of
the antenna. To improve selectivity, you have to improve the Q of the
antenna. About all you can do is use a resonant length (halfwave),
and mount it high and in the clear to minimize losses. That'll give
you the best Q with the most signal. The coil in a crystal set is
a loading coil for the antenna which allows you to resonate it at
various frequencies by adjusting the sliding tap. But as with any
coil loaded antenna, losses are least when the coil is smallest and
the antenna is closest to natural resonant length.

If signals are strong, you can change to a loose coupler circuit
to gain selectivity. In this case you add a capacitor in parallel
with the coil to form a resonant tank at the frequency of interest
and loosely link couple the antenna to the tank. This will, of course,
knock signal levels way down, but selectivity will be much better.
That's because loading on the antenna and tank are less, due to the
loose link coupling, so the loaded Q is higher.

If signals are *really* strong, you can use two tank circuits,
with loose coupling between them, to improve selectivity even more.
When you get to three or more coupled tanks, selectivity starts to
become reasonable, but signal levels become very small due to the
loose coupling. So you want to add amplifier stages between the
tuned circuits. Now you have a TRF receiver (another old classic),
but of course now you need to power it.

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


From [e-mail] Sun Jul 21 18:53:40 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: crystal radio
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]> <[e-mail]>
Date: Tue, 16 Jul 1996 13:49:46 GMT
Lines: 83

In article <[e-mail]> Shimon Hirschhorn <[e-mail]> write
s:
>Gary Coffman wrote:
>> The only selectivity a classic crystal set has is the loaded resonance of
>> the antenna. To improve selectivity, you have to improve the Q of the
>> antenna. About all you can do is use a resonant length (halfwave),
>> ........
>
>I appreciate the help.  I will try a simpler antenea.  I want to avoid a
>powered set if I can.  What my son finds so interesting about the set is
> that it works as if by magic.  He can accept that a sophisticated
>electronic device can do almost anything.  That a crystal set without
>even a battery works is amazing.  BTW, most of my co-workers who are
>fairly educated sofware people are sure that I am lying about a
>non-powered radio.
>
>I still would like to find a better kit if I can.  I want to keep my
>sons interest in electronics up.  Small projects that he can do with
>little help like a crystal set fit the bill.  Not having it attached to
>the AC kepps my wife calm about the matter.

Ok, here's a classic loose coupled design. The coil can be an old
loopstick out of a discarded AM radio, and the variable capacitor
can be from a discarded AM set as well.

       ___
Ant    \|/
        |               1N34
        |    -----x------->|----x---------->
        | || (    |             |
        | || (    = 365pf var   =  .1 uf      to high impedance headphones
        | || (    |             |
Link->  ) || (----x-------------x---------->
        |
       _|_
Gnd    ///

The link should be a couple of turns around one end of the loopstick.
You can vary the number of turns on the link and the position of the
turns on the coil to vary coupling, and hence selectivity.

Now if you add a second tank like this

        ANT GND
         |  |                  D1
   ---)||(  |     ||(--x------->|----x-------->
   |  )||(--x     ||(  |             |
C1 =  )||         ||(  = C2          = C3     to headphones
   |  )||(-------)||(  |             |
   x--|||(-------)||x--x-------------x-------->
       L1  Link    L2

Now you have one tank, L1, C1, which has the antenna link coupled
to it as before, but now that tank also has a link coupled to a
second tank, L2, C2, which you also resonate. By varying the number
and positions of the turns on the antenna link, the first tank link,
and the second tank link, you can make tradeoffs between sensitivity
and selectivity. D1 is your "crystal". That can be an actual crystal,
or a germanium diode like a 1N34. C3 is a RF bypass capacitor to
close the circuit, anything from .001 to .1 uf should work.

Now if you insert a transistor RF amplifier in the link, you'll have
a TRF receiver. A simple amp powered by a battery will work fine.
This may be needed if signal levels are too low at the headphones.
You can also add a battery powered audio amp and drive a loudspeaker
instead of headphones. These would be the obvious next steps after
building the crystal set. You don't need to fool with AC power.

(Note there are better ways than the TRF if you decide to go with
amplification. The real next obvious step would be to build a
regenerative receiver. I won't even attempt to draw that with
ASCII art, but it can be done with only 2 transistors.)

Note that a good way to build these circuits is breadboard fashion.
Use a real breadboard (a pine plank). Draw the circuit on the plank,
drive brass brads at each connection point, and install and wire the
components to these brads.

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


From [e-mail] Sun Jul 21 18:53:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!tank.news.pipex.net!pipex!hole.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!news1.erols.com!news
From: Jake Brodsky <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: crystal radio earphones
Date: Tue, 16 Jul 1996 11:33:04 -0700
Organization: Wheeeeee!
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: dam-as4s31.erols.com
Mime-Version: 1.0
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X-Mailer: Mozilla 2.0 (Win16; I)

Anyone know a good source for those high impedance crystal earphones
like they used to put in crystal radio kits about 20 years ago?

73,

Jake Brodsky, AB3A
"Beware of the massive impossible!"


From [e-mail] Sun Jul 21 18:53:42 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-fw-12.sprintlink.net!news.dgsys.com!tahiti.netreach.net!chesco.com!news.jersey.net!news.win.bright.net!news.bright.net!chil4-cs-13.dial.bright.net!user
From: [e-mail] (Charles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: crystal radio earphones
Date: Tue, 16 Jul 1996 15:23:01 -0400
Organization: BrightNet Ohio
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: chil4-cs-13.dial.bright.net

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

> Anyone know a good source for those high impedance crystal earphones
> like they used to put in crystal radio kits about 20 years ago?
>
> 73,
>
> Jake Brodsky, AB3A


Yes Try Antique Electronic Supply, 6221 S. Maple Ave., Tempe, AZ  85283
Phone [phone]. They have phones and all other parts to build crystal
radions the old fashioned way, along with good crystal kits. I do not work
for them. Hope this helps.

Charles


From [e-mail] Sun Jul 21 18:53:43 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.zeitgeist.net!bdt.com!hal.COM!news.ucsc.edu!helios.ucolick.org!sutin
From: [e-mail] (Brian Sutin)
Newsgroups: rec.radio.amateur.homebrew
Subject: CW Crystal Filters & AGC Chips
Date: 17 Jul 1996 20:28:41 GMT
Organization: Lick Observatory UCSC
Lines: 18
Message-ID: <4sjidp$[e-mail]>
NNTP-Posting-Host: helios.ucolick.org

I intend to homebrew a 50 MHz CW tranceiver out of block parts, and
then upgrade the pieces as I go.  The parts I can't find easily are
the filters and the AGC circuit.

I am looking for a small-quantity supplier for CW (500 Hz) crystal
filters, preferably near 25-30 MHz, but 8-10 MHz or elsewhere is ok.
I will design around what I can find.

I am also looking for an AGC chip -- a chip with the IF amp and an
audio input, which does all of the AGC computations internally.  I
don't know if these exist (perhaps as part of a larger circuit).

Thanks!

Brian Sutin               KD6TLA            [e-mail]
Lick Observatory, UCSC                      Santa Cruz, CA 95064
    Fred:   "May I rescue you?"                   `Top Hat,' RKO 1935
    Ginger: "No, thank you.  I prefer being in distress."


From [e-mail] Sun Jul 21 18:53:44 1996
Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news
From: A Guy named Moe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Diagram Plans
Date: Fri, 19 Jul 1996 23:55:28 -0700
Organization: **************
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: burgessville-157.oxford.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5a (Win16; I)

Does anyone have or know were to get plans to build good quality FM or
AM transistors?


thanks


From [e-mail] Sun Jul 21 18:53:45 1996
Path: news2.epix.net!uunet!in2.uu.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!cs.utexas.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!mozo.cc.purdue.edu!news
From: Mark <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Digital Microwave Radio
Date: Fri, 19 Jul 1996 09:11:03 -0500
Organization: Purdue University
Lines: 15
Message-ID: <[e-mail]>
References: <4smur8$[e-mail]>
NNTP-Posting-Host: expert.cc.purdue.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win95; I)
Xref: news2.epix.net rec.radio.amateur.homebrew:16198 rec.radio.amateur.digital.misc:16536

Nick Kralevich wrote:

> I have the unique fortune of living about 1000 ft (0.2 miles, or 330
> meter) away from an internet service provider.  I've been working with
> this provider for quite some time, and I want to setup a full time
> link to them.  I am hoping that this will be a high speed link
> (1/2 T1 speed).  Laying actual wire is out of the question, because it
> crosses heavily used roads.

This won't work on amateur frequencies, as the transmissions comming
from the internet would most likely contain material from non-amateurs
and could also be made up of content unsuitable for transmission on
the amateur bands.

Mark  <KB9KHM>


From [e-mail] Sun Jul 21 18:53:46 1996
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!newshub.csu.net!newsserver.sdsc.edu!usenet
From: [e-mail] (Stewart Teaze)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Digital Microwave Radio
Date: 19 Jul 1996 20:56:43 GMT
Organization: ASI
Lines: 34
Message-ID: <4sosqb$[e-mail]>
References: <4smur8$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 141.248.174.218
X-Newsreader: WinVN 0.92.1
Xref: news2.epix.net rec.radio.amateur.homebrew:16201 rec.radio.amateur.digital.misc:16542

In article <[e-mail]>, Mark <[e-mail]
.edu> says:
 >
 >Nick Kralevich wrote:
 >
 >> I have the unique fortune of living about 1000 ft (0.2 miles, or 330
 >> meter) away from an internet service provider.  I've been working with
 >> this provider for quite some time, and I want to setup a full time
 >> link to them.  I am hoping that this will be a high speed link
 >> (1/2 T1 speed).  Laying actual wire is out of the question, because it
 >> crosses heavily used roads.
 >
 >This won't work on amateur frequencies, as the transmissions comming
 >from the internet would most likely contain material from non-amateurs
 >and could also be made up of content unsuitable for transmission on
 >the amateur bands.
 >
 >Mark  <KB9KHM>

As long as one could reasonably ensure the transmissions were compliant,
there should not be a problem.  For example e-mail forwarding should
be OK(3rd party traffic, right?), but reading alt.sex.xxx newsgroups
containing profanity or business spams probably shouldn't be OK.

The only REAL Part 15 argument that could work against your link, would
be that it would be BYPASSING a viable commercial means of communications;
the telephone.  However, if you kept a web page that was up 24hrs/day,
you can argue that it is not reasonable to keep a telephone link
operational 24hrs/day, and so you would not be bypassing a commercial
system.

However, why worry about amateur compliance anyway?
The 900mhz band is now available for public data communications use,
and would probably work for Nick's application.



From [e-mail] Sun Jul 21 18:53:47 1996
Path: news2.epix.net!uunet!in2.uu.net!world1.bawave.com!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!zombie.ncsc.mil!newsgate.duke.edu!agate!nickkral
From: [e-mail] (Nick Kralevich)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Digital Microwave Radio
Date: 19 Jul 1996 23:15:07 GMT
Organization: Electrical Engineering Computer Science Department, University of California at Berkeley
Lines: 40
Message-ID: <4sp4tr$[e-mail]>
References: <4smur8$[e-mail]> <4snmlr$[e-mail]>
NNTP-Posting-Host: america.cs.berkeley.edu
Xref: news2.epix.net rec.radio.amateur.homebrew:16203 rec.radio.amateur.digital.misc:16544

In article <4snmlr$[e-mail]>,
Bob Merritt <[e-mail]> wrote:
>Go to the nearest ham radio store and buy a copy of the ARRL Handbook
>for Radio Amateurs and then read up on the 10Ghz Gunnplexor/2MBPS
>project....

Will do!

>You can also get a jumpstart by checking out the various links from my
>web pages on high speed packet....
>http://www.mindspring.com/~bobm

Will do!  :)

>Oh the
>guys over in Utah have put together a T1 system, do a search to find
>more info on it...

Do you have a hint for what to search for?

>also you might want to check out "off the shelf"
>solutions with things like the WaveLan cards....

I was hoping to avoid "off the shelf" solutions due to their high cost.
Besides, it would be interesting to experiment with building equipment
like this.

>Realistically, using the new WA4DSY 56k RF modems may be what you
>need....

I'll look into that too.

Thanks for all the info!

Oh, one more question.  Do you have any idea how much this type of
project would cost?

Take care,
-- Nick Kralevich
   [e-mail]


From [e-mail] Sun Jul 21 18:53:49 1996
Path: news2.epix.net!uunet!in2.uu.net!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.nidlink.com!usenet
From: "Thor Wiegman" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Digital Microwave Radio
Date: Fri, 19 Jul 1996 22:47:54 -0700
Organization: NetLink, Inc.
Lines: 48
Message-ID: <01bb75ff.88cf0700$[e-mail]>
References: <4smur8$[e-mail]>
NNTP-Posting-Host: pm4-2.nidlink.com
X-Newsreader: Microsoft Internet News 4.70.1085
Xref: news2.epix.net rec.radio.amateur.homebrew:16209 rec.radio.amateur.digital.misc:16551



: [e-mail] (Nick Kralevich) wrote in article
<4smur8$[e-mail]>...
: I have the unique fortune of living about 1000 ft (0.2 miles, or 330
: meter) away from an internet service provider.  I've been working with
: this provider for quite some time, and I want to setup a full time
: link to them.  I am hoping that this will be a high speed link
: (1/2 T1 speed).  Laying actual wire is out of the question, because it
: crosses heavily used roads.
:
: I read on rec.radio.amateur.digital.misc that a microwave transmitter
: and receiver combo would be the ideal solution to this problem.
: In addition to being low cost, it also gives the necessary range and
: high speed performance for what I need (this is what I read...).
:
: I'm guessing that I have to design my own setup for this type
: of thing.  Actually, I would prefer to do my own construction of
: this microwave transmitter, since it would give me good experience
: dealing with microwave circuits (I'm a recent graduate of UC Berkeley
: with a bachleors degree in Electrical Engineering and Computer Science).
:
: I've been doing a lot of internet research, in addition to going
: to book stores and libraries to find a design for this type of thing.
: Unfortunately, I can't find any design online or in books.
:
: Does anyone know of a design for a digital microwave
transmitter/receiver
: combo that is available on the internet or in book form?  Or
: perhaps I'm going about this in the wrong direction...
:
: Once I got the hardware in place, I could handle the IP routing
: myself.  (I'm great with software, but not quite as good with hardware).
:
: Any suggestions would be appreciated.


As my boss always says "why re-invent the wheel?"  Western Multiplex makes
a little SS unit for 2GHz called the Lynx.  These are showing up on the
surplus market because for high reliablilty/quality most cell techs don't
like them (a matter of personal taste).  I would think that picking up a
used pair of these would be cheaper and easier than building something
unless you're looking for the experience.  These units don't require a
license for operation as they are covered under part 15.  I've put up 40
mile hops with them (using 8 foot high performance dishes) so I would
think that a pair of homebrew yagi's would get the job done for you.




From [e-mail] Sun Jul 21 18:53:49 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!nntp.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!malgudi.oar.net!usenet
From: Paul Knight <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FAR Circuits Address
Date: Wed, 17 Jul 1996 16:00:57 -0700
Organization: Eaton Corp., Appliance Controls
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: firewall.etn.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; U)

Greetings!  Could someone drop me a note with the address for FAR
Circuits, the Illinois-based PC board vendor who develops many of
the boards found in QST projects?

--
Thanks!

Paul Knight WD8DKY
[e-mail]

-or-

[e-mail]


From [e-mail] Sun Jul 21 18:53:50 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!nntp.primenet.com!uunet!inXS.uu.net!csnews!coopnews.coop.net!news.den.mmc.com!NewsWatcher!user
From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FAR Circuits Address
Followup-To: rec.radio.amateur.homebrew
Date: 18 Jul 1996 20:57:46 GMT
Organization: A Turbulent One
Lines: 7
Distribution: na
Message-ID: <thomas.g.booth-180796145619@160.205.101.24>
References: <[e-mail]>
NNTP-Posting-Host: 160.205.101.24

FAR Circuits
18N640 Field Court
Dundee, Ill.  60118

TGB

\\ The opinions expressed herein are my own. //


From [e-mail] Sun Jul 21 18:53:51 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!feemsa.toddalan.com!news.sprintlink.net!news-dc-9.sprintlink.net!news.nevada.edu!news.tamu.edu!bcm.tmc.edu!cs.utexas.edu!swrinde!howland.reston.ans.net!Germany.EU.net!wizard.pn.com!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Jon Bloom <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FAR Circuits Address
Date: Fri, 19 Jul 1996 11:59:51 -0400
Organization: American Radio Relay League
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]> <thomas.g.booth-180796145619@160.205.101.24>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
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Booth, Thomas G wrote:
>
> FAR Circuits
> 18N640 Field Court
> Dundee, Ill.  60118
>
> TGB

FAR Circuits now has a Web page, too:

http://www.cl.ais.net/farcir/

--
Jon Bloom, KE3Z                   | [e-mail]
American Radio Relay League       |
225 Main St., Newington CT 06111  |


From [e-mail] Sun Jul 21 18:53:52 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!news.nl.innet.net!INnl.net!news.be.innet.net!INbe.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!uwm.edu!newsfeed.internetmci.com!inXS.uu.net!news.new-york.net!news2.new-york.net!not-for-mail
From: Raymond Hoopes Jr <[e-mail]>
Subject: FS : Radio Equipment
Content-Type: text/plain; charset=us-ascii
X-Nntp-Posting-User: (Unauthenticated)
Content-Transfer-Encoding: 7bit
Message-ID: <[e-mail]>
X-Mailer: Mozilla 2.02 (Win16; I)
Mime-Version: 1.0
X-Trace: 837795986/21993
X-Nntp-Posting-Host: southerntier.com
Date: Tue, 16 Jul 1996 23:22:58 GMT
Lines: 11

Transciever 736R Yaesu with Microphone / New
Antennas 2M and 70CM yagi
SWR Meter
Dummy Load
Approx. 60 Feet 6013 coax
PK 88 packet Modem/New with 24v power supply

For Sale for $1800 or most offer.
E-Mail : [e-mail]
Phone : [phone]
Raymond Hoopes Sr.


From [e-mail] Sun Jul 21 18:53:53 1996
Path: news2.epix.net!uunet!in2.uu.net!spool.mu.edu!munnari.OZ.AU!news.mel.connect.com.au!news.uwa.edu.au!disco.iinet.net.au!opera.iinet.net.au!news
From: [e-mail] (Richard Hosking)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew
Date: Sat, 20 Jul 1996 05:02:19 GMT
Organization: iiNet Technologies Pty Ltd
Lines: 17
Message-ID: <4spoqb$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: grunge244.nv.iinet.net.au
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Doug Thomson) wrote:

> Do you have a website, and if so, what is the address.
>  Tns.
>  Douglas Thomson, [e-mail]
>
Check the Perth Radio Experimenters group
http://www.iinet.net.au/~richardh

New articles due soon when I get this DDS system going!

Richard Hosking

VK6BRO
[e-mail]
http://www.iinet.net.au/~richardh



From [e-mail] Sun Jul 21 18:53:54 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.primenet.com!news.cais.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!sgigate.sgi.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!sdd.hp.com!inn
From: Tiger X-term <t4>
Newsgroups: rec.radio.amateur.homebrew
Subject: Has anyone modded a Rejunkcy RTE-202 to 900 mhz?
Date: 19 Jul 1996 04:39:40 GMT
Organization: Hewlett Packard, San Diego Division
Lines: 7
Message-ID: <4sn3ic$[e-mail]>
NNTP-Posting-Host: hpsdsv05.sdd.hp.com
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X-URL: news:rec.radio.amateur.homebrew

Has anyone out there done the mod to make the Regency RTE-2020 go to 900 mhz
ham bands? I've heard it can be done.

Can anyone help?

Thanks..Don.



From [e-mail] Sun Jul 21 18:53:54 1996
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!mac208.ed.uiuc.edu!user
From: [e-mail] (Y. Doug Uno)
Newsgroups: rec.radio.amateur.homebrew
Subject: Heathkit toroids
Date: Sun, 14 Jul 1996 13:50:25 -0500
Organization: University of Illinois
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: mac208.ed.uiuc.edu

Greetings,
   I am about to attempt to replace the toroids in the receive section of
an HW-8 that I acquired a while back.  I have a catalog from Amidon Co. in
Santa Ana, CA and it looks like they have what I'll need.  Any advice on
do's and don'ts in making and installing a toroid in an old radio?  Thanks
in advance for your help.

73 de Ray, WA9AXL
Urbana, IL
[e-mail]

--
Y. Doug Uno       e-mail: [e-mail]
University of Illinois
1304 W. Springfield Ave.  Room 2413
Urbana, IL 61801


From [e-mail] Sun Jul 21 18:53:55 1996
Path: news2.epix.net!uunet!in2.uu.net!world1.bawave.com!newsfeed.internetmci.com!btnet!zetnet.co.uk!usenet
From: Frank Dinger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help - setting up a 6m station
Date: Mon, 15 Jul 1996 21:00:30 +0100
Lines: 23
Message-ID: <[e-mail]>
References: <4sbpcf$[e-mail]>
NNTP-Posting-Host: piccadilly.zetnet.co.uk
X-Mailer: ZIMACS Version 1.09u 10001740

> I would appreciate any inputs regarding setting up a 50MHz station
> for the least possible cost. I have a Yaesu FT757GX MK2 and I am
> therfore interested in transverters, amplifiers, antennas etc.
> Any advice at all please send to my e-mail address.
> Russ
> G7AXN
================
Russell, For an excellent 50 MHz transverter and ditto for4m, 2m and
70cms ,I recommend :The VHF/UHF DX Book , edited by Ian White, G3SEK
. It includes a chapter by G4HUP ,'A high performance 50 MHz
transverter', pages 9-2 to 9-19. There are also chapters on antennas
,linear amplifiers etc.
A really excellent book for the home constructor.
Publisher: DIR Publishing , ISBN  0 9520468 0 6.
You can check availability with Ian White ,G3SEK
e-mail:[e-mail]
Success with the transverter ,best wishes
Frank ,   Inver by Tain , Ross-shire - Scotland UK
e-mail :  [e-mail]
Packet :  GM0CSZ @ GB7NOS.#76.GBR.EU





From [e-mail] Sun Jul 21 18:53:56 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!sol.ctr.columbia.edu!news.ess.harris.com!usenet
From: Paul Anderson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help!!!     Phone # for Jan crystals .......?????
Date: Thu, 18 Jul 1996 04:50:50 -0700
Organization: Harris Corp
Lines: 18
Message-ID: <[e-mail]>
References: <01bb7440.67619d00$d5681fce@vigilant>
NNTP-Posting-Host: pander01.ess.harris.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; I)
To: vigilant <[e-mail]>

vigilant wrote:
>
> Does anyone out there have the phone number for jan crystals????? I found
> them listed on the net but when I went to the address...they weren't
> there....I am guessing that they "moved" their site or went out of
> business or something......................................thanks in
> advance.

Try 1-800-JAN-XTAL

--

7777777  3333333      ****************************************
    77       33       **   Paul Anderson, AB4VA             **
   77       33        **   [e-mail]              **
  77         33       **   AB4VA @ KT4DI.#MLBFL.FL.USA.NA   **
 77      33  33       ****************************************
77         33


From [e-mail] Sun Jul 21 18:53:59 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cableol.net!news-lond.gsl.net!news.gsl.net!news-paris.gsl.net!news.gsl.net!news-dc.gsl.net!news.gsl.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!newsfeed.internetmci.com!nntp.earthlink.net!usenet
From: Chris Boone <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help: Building a repeater system
Date: Wed, 17 Jul 1996 18:47:46 -0700
Organization: ENTERGY - Texas : Telecommunications Dept
Lines: 39
Message-ID: <[e-mail]>
References: <4sbcg4$[e-mail]>
NNTP-Posting-Host: pool054.max6.houston.tx.dynip.alter.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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KC8DML wrote:
>
> I was told by someone that you could somehow link two base station or
> mobile radios like the Motorola Mocom 70 and it could operate like a
> repeater. I am an amatuer radio operator and I am trying to put together a
> radio system for my dad's business on high band (148-174).

Ahhh Rob.....
Repeaters in VHF High band are NOT that easy to get licensed or
coordinated in the major metro areas...The channels are crowded and hard
to come by nowadays....
If you havent gotten a license for the system, I wouldnt bother looking
for gear....you'll have plenty of time for that!
(Besides there is plenty of GE MSTR II, etc on the market that works
just fine! Rptrs, bases, mobiles converted to rptrs, etc)

>I am also
> looking for any new or used VHF radio equipment, (handhelds, mobiles, base
> stations, pagers(ex. Minitor II),  test equipment, and possible ideas on
> what kind of antenna system I should use (1/4 wave vertical with ground
> radials, ground plane, or just a simple dipole???). Would I need two
> seperate antennas???
>
> THX de KC8DML
> Rob
> Chardon, Ohio
> 147.21+   444.65+
> 147.015+ 444.375+
> 146.76-    146.94-
> In the Cleveland Area

Chris
WB5ITT
PG-9-5322 Commercial
224.8/444.8 Conroe/Houston, TX  WB5ITT
224.5/444.5 Beaumont, TX        WB5ITT
and various other rptr systems




From [e-mail] Sun Jul 21 18:54:00 1996
Path: news2.epix.net!uunet!in2.uu.net!news.leonardo.net!news.vbc.net!samba.rahul.net!rahul.net!a2i!olivea!sgigate.sgi.com!spool.mu.edu!agate!howland.reston.ans.net!nntp.crl.com!usenet
From: Dave Booth kc6wfs <[e-mail]>
Newsgroups: rec.radio.scanner,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,fidonet.ham,rec.ham-radio,rec.ham-radio.packet,rec.ham-radio.swap,slac.rec.ham_radio,su.org.ham-radio,swb.lists.linux.hams,rec.radio.swap,tnn.radio.amateur,uwarwick.societies.amateur-radio
Subject: homepage
Date: Tue, 16 Jul 1996 15:41:53 -0700
Organization: KC6WFS
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: 165.113.223.131
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Xref: news2.epix.net rec.radio.scanner:54216 rec.radio.amateur.antenna:23297 rec.radio.amateur.digital.misc:16523 rec.radio.amateur.dx:131 rec.radio.amateur.equipment:31144 rec.radio.amateur.homebrew:16190 rec.radio.amateur.misc:105345 rec.radio.amateur.policy:35559 rec.radio.amateur.space:7337 fidonet.ham:7 slac.rec.ham_radio:62 su.org.ham-radio:292 swb.lists.linux.hams:13 rec.radio.swap:70403 tnn.radio.amateur:64 uwarwick.societies.amateur-radio:25

If you get boared. Check out my Ham Page. Lots of good links!
http://www.geocities.com/Hollywood/5860
--
Dave Booth
kc6wfs


From [e-mail] Sun Jul 21 18:54:00 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-13.sprintlink.net!newsfeed.internetmci.com!news.flinet.com!news
From: [e-mail] (Bill Hayhurst)
Newsgroups: rec.radio.amateur.homebrew
Subject: ICOM R-7000 12 VOLT DC OPERATION
Date: Thu, 18 Jul 1996 00:45:20 GMT
Organization: Florida Internet
Lines: 8
Message-ID: <4sk2mk$[e-mail]>
NNTP-Posting-Host: wpb31.flinet.com
X-Newsreader: Forte Free Agent 1.0.82

Does anyone know the wiring of this radio for 12 volts dc?

Icom offers a kit for $30.00.

Seems like it should be simple.   Any help???

Thanks.  Bill Hayhurst  KE4IDU



From [e-mail] Sun Jul 21 18:54:01 1996
Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!van.istar!west.istar!news.jumppoint.com!b08m
From: [e-mail] (Steve McDonald)
Newsgroups: rec.radio.amateur.homebrew
Subject: Low Frequency Scrapbooks
Date: Fri, 19 Jul 96 14:20:50 GMT
Organization: deepcove.com
Lines: 8
Distribution: world
Message-ID: <4so85r$[e-mail]>
NNTP-Posting-Host: b08m.deepcove.com
X-Newsreader: News Xpress Version 1.0 Beta #2

I am trying to locate some of the earlier editions of:

        THE LOW and MEDIUM FREQUENCY SCRAP BOOKS

These are published by KEN CORNELL (W2IMB). I am looking for editions #1 - 8.
If  you have one
and would like to sell it (or lend to me for photocopying), can you please e-m
ail me.
Many thanks,
Steve (VE7SL)


From [e-mail] Sun Jul 21 18:54:02 1996
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.sprintlink.net!news-stk-200.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news.gate.net!nntp.seflin.lib.fl.us!p014971b
From: [e-mail] (George Butler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Antenna Tuner
Date: 16 Jul 1996 21:54:38 GMT
Organization: SEFLIN Free-Net - Palm Beach
Lines: 11
Message-ID: <4sh32u$[e-mail]>
NNTP-Posting-Host: pbfreenet.seflin.lib.fl.us
X-Newsreader: TIN [version 1.2 PL2]

I am looking for an antenna tuner design. Any suggestions?

Please reply directly to the address below.

TIA

--

George Butler
[e-mail]



From [e-mail] Sun Jul 21 18:54:03 1996
Path: news2.epix.net!uunet!in2.uu.net!wizard.pn.com!news.zeitgeist.net!vnetnews.value.net!dkg
From: [e-mail] (David Genrich)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need input on HF antenna idea
Date: Mon, 15 Jul 96 18:28:16 GMT
Organization: Value Net Internetwork Services Inc.
Lines: 21
Message-ID: <4se2tc$[e-mail]>
NNTP-Posting-Host: h232.value.net
X-Newsreader: News Xpress 2.0 Beta #0

I am currently looking at a HF unit to add to my shack.  The problem is,
I am in an apartment, making it diffuclt to put up a low band antenna.

However, while out on my pouchh the other day I noticed the rain gutter
comes down right at the edge of my pouch (I'm on the ground floor).

Anyway, here is my idea:  Disconnected the raingutter from the ground,
then load the gutter up through a matching transformer.  Would this
work?  I'm also worried about how this RF energy would affect others.
What if someone touchs it while transmitting (200 Watts)?  I figured
that there was atleast 1000 feet of aluminum rain gutter going around
the building (very conservitive figure).  Thus, with 200 Watts, there
souldn't be that much RF at any one point that would harm anyone.  Maybe
only transmit at night?  I'm also conserned on how it will affect other
peoples TV and radio reception.

So, will this idea work?  Any ideas, thoughts, or comments?

David Genrich, KF6CZP
[e-mail]



From [e-mail] Sun Jul 21 18:54:04 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Power supplies for 4CX250 or 4X150.
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Tue, 16 Jul 1996 14:09:22 GMT
Lines: 47

In article <[e-mail]> [e-mail] (R Chris Ross) writes:
>
>     I have been collecting parts for an amplifier using a 4X150 on
>6 meters.  The plate supply is easy but I'm not too sure about the
>grids.  One supply is about 300 VDC at ~ 50 mA regulated and the
>other is at aboth -75 VDC but I don't know the current draw.  Is the
>300 V supply right and what is the current level on the -75 V supply.

300 volts sounds about right for the screen grid supply, but 50 mA
sounds high for screen current. The -75 volt supply is the control
grid bias supply. It shouldn't need to supply any current at all
to the tube, but it needs to be adjustable so you can set the idling
current of the amplifier. -75 volts sounds close to, if not beyond,
cutoff for the tube, so you'll want to be able to reduce this bias
voltage to set idling current. (I have a suspicion that the circuit
you have is for a Class C amp. You probably want a Class AB1 amp
instead.)

Note that screen supplies aren't simple. It needs to hold regulation
with either positive or negative current flow. There may be a shunt
resistor in the circuit used for this, and that would explain the
50 mA rating of the supply. And the screen needs to be bypassed well
for RF. You also want the control circuits to apply HV before screen
voltage, and remove screen voltage before removing HV, or you could
destroy the grid as it tries to become the tube plate. (This can be
done at the same time if you can ensure that screen voltage will
never be present without HV being present.)

>     One of the things that I was looking at is that it would be
>extremely easy for me to design a switching supply for the grid
>supplies running off of say 12 VDC.  This could lead to later
>designing a 12 VDC to ~1500 VDC plate supply for portable operation.
>My only problen is not being familiar with the requitements for these
>supplies and old designs don't worry about it.

Get a copy of Eimac's "The Care and Feeding of Power Grid Tubes" and
read up on what you need to do to make these amps live. You can use
switching supplies, but be careful to shield and filter them well.
If RF gets into them, they can go wild and destroy themselves, or
the tube.

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


From [e-mail] Sun Jul 21 18:54:05 1996
Path: news2.epix.net!uunet!in2.uu.net!spool.mu.edu!munnari.OZ.AU!news.mel.connect.com.au!news.uwa.edu.au!disco.iinet.net.au!opera.iinet.net.au!news
From: [e-mail] (Richard Hosking)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew,comp.dsp
Subject: Qualcomm Q2334 DDS
Date: Sat, 20 Jul 1996 05:17:26 GMT
Organization: iiNet Technologies Pty Ltd
Lines: 14
Message-ID: <4sppmm$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: grunge244.nv.iinet.net.au
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net sci.electronics.design:10112 rec.radio.amateur.homebrew:16211 comp.dsp:30161

Gday all

I have built a board using the Qualcomm Q2334 dual DDS but am having
difficulty with the software - so much so that I wonder if I have
damaged the chip in some way. Does anyone have pointers to software to
drive the chip - are there any special problems?

Thanks

Richard Hosking
VK6BRO
[e-mail]
http://www.iinet.net.au/~richardh



From [e-mail] Sun Jul 21 18:54:06 1996
Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news
From: A Guy named Moe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio Information
Date: Fri, 19 Jul 1996 23:54:24 -0700
Organization: **************
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: burgessville-157.oxford.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5a (Win16; I)

I was just wondering if anyone could tell me in Canada what is the
maximum distance and signal stranght that an amatureradio station could
broadcast with?


thanks


From [e-mail] Sun Jul 21 18:54:07 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!nntp.primenet.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB100 Part Needed
Date: 16 Jul 1996 16:26:28 -0700
Organization: BEST Internet Communications
Lines: 20
Message-ID: <4sh8f4$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <[e-mail]>,
Hector A. Gomez <[e-mail]> wrote:
>I was needing a 40 Meter Hetradyne Crystal(15.895MHz) for my Heathkit
>SB100.  Please let me know if you have one for sale or trade or even if
>you just know where I can locate one.
>
>
>Thanks,
>
>Hector
>KC5CXC

If no one has one from a trashed SB100, you can copy the oscillator
section of the schematic and send it to International Crystal in
Oklahoma and they will make you one.  Probably cost about $12.00.

Good Luck

Steve M. WF6R



From [e-mail] Sun Jul 21 18:54:08 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news
From: A Guy named Moe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Small Radio
Date: Sun, 21 Jul 1996 17:44:56 -0700
Organization: **************
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: burgessville-137.oxford.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5a (Win16; I)

I would like to setup a small radio station but I need plans and
diagrams to build a fm transmiter


thanks


From [e-mail] Sun Jul 21 18:54:09 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.inc.net!uwm.edu!news-res.gsl.net!news.gsl.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!netnews.worldnet.att.net!newsadm
From: Jim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source of Ferrite Beads?
Date: Sun, 21 Jul 1996 10:31:03 +0000
Organization: AT&T WorldNet Services
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 235.atlanta-3.ga.dial-access.att.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; I)

fiz wrote:
>
> Hi,
>
> Can anyone recommend a place to get ferrite beads big enough to slip over
> RG-58? They don't need to slip over the BNC connector, only the cable,
> 0.2" OD.
>
> ttfn fiz (KG0YG)Contact AMIDON at [phone] and ask for their catalog.
They carry a
large selection of ferrite beads of various sizes and types.  Also, try
your next local hamfest.  CQ and QST have many advertizers that offer
what you are looking for or can provide a source that may be close to
you.  Good luck...

DE KC4FWS

Jim

[e-mail]


From [e-mail] Sun Jul 21 18:54:10 1996
Path: news2.epix.net!uunet!inXS.uu.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.sprintlink.net!news-pen-14.sprintlink.net!coopnews.coop.net!news.den.mmc.com!NewsWatcher!user
From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: very low frequency recievers
Followup-To: rec.radio.amateur.homebrew
Date: 15 Jul 1996 21:44:24 GMT
Organization: A Turbulent One
Lines: 49
Distribution: na
Message-ID: <thomas.g.booth-150796121927@160.205.101.24>
References: <4sbp84$[e-mail]> <4scch2$[e-mail]>
NNTP-Posting-Host: 160.205.101.24

In article <4scch2$[e-mail]>, [e-mail] (Lrware)
wrote:

> Depending on your location WWVB can be a real pain.
> I live in Orlando, Florida (very high local noise level)
> and bought a commerical unit surplus after
> several trys at building a working unit.
> The good news is I just read where NIST is going to turn up
> the transmitted power at WWVB next year. If I remember
> correctly they plan to triple it.
> Check out "73 Amateur Radio Today"
> Jan, Feb & Mar 1994 issues for a design by
> Bob Roehrig (K9EUI).
> Also look at the Aug. 1973 issue of "Radio Electronics."
> for some design data from Don Lancaster.
> -Larry

Here's a couple of comments to complement Larry's posting:

1)  I have built Bob Roehrig's WWVB active antenna, receiver and frequency
comparator, and they work just fine.  Unlike Larry, I happen to be blessed
(?) w/ being approx. 65 mi. from the WWVB transmitter site; I had to really
reduce the receiver gain to comply w/ Bob R.'s alignment criteria.  I guess
I'll have to reduce the receiver gain further when the ERP of WWVB is
increased...

2)  Beware of local noise sources (esp. light dimmers) whilst receiving
WWVB.  During my initial bench test on the active antenna and receiver,
just one activated dimmer in my house produced enough interference to
render the received WWVB signal useless.

3)  Don Lancaster's WWVB article in the August 1973 issue of
Radio-Electronics (and the concluding article in the September 1973 issue)
IMO provides an alternative WWVB receiver approach, but the designs
presented may require some revision due to obsolete/unobtainable parts.
Note also that Lancaster's articles were oriented towards reception of the
WWVB serial time code vs. Roehrig's emphasis on frequency comparison
(though both authors discuss ways to get both frequency and time code from
their projects).

4)  Another source of information (if you can find a copy) is the October
1964 issue of Hewlett Packard Journal.  This issue has an article which
discusses the venerable HP 117A VLF Comparator, which AFAIK was one of the
first instruments designed to provide a relatively quick means of
NBS/NIST-traceable frequency comparison via WWVB.

TGB

\\ The opinions expressed herein are my own. //


From [e-mail] Sun Jul 21 18:54:11 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!howland.reston.ans.net!nntp.coast.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!insync!news
From: [e-mail] (erikc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want to build stereo amp- where to start?
Date: Wed, 17 Jul 1996 21:56:51 GMT
Organization: bugshit.nutso.com
Lines: 35
Message-ID: <4sjnau$[e-mail]>
References: <4sh162$[e-mail]>
NNTP-Posting-Host: dialup-164-100.insync.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Bigdick McGee) wrote:


+-> I would like to build my own 80-150 watt per channel amplifier fro
my
+-> home audio system.  I just don't know where to start.  Can anyone

+-> recommend a good reference for starting such a project?  Something
that
+-> will really lead me along with a project that I can improve
myself.

+-> Thanks, Jed <[e-mail]>


My recommendation would be to go to the rec.audio.* groups.  They will
be far more helpful to you there.

Erikc



+-> --
+->
******************************************************************************
+-> Hey Der, Polka Boy, Go Home and Suck a Beer                *   Go
Bears!
+-> Hey Der, Bratwurst Head, Go Drive Your Old John Deere      * (both
of 'em)
+-> Yah Hey, Keep Your Women Away, The Smell Will Make Us Cry  *

Anything critical said of me by a religious zealot only
further convinces me that I am on the right path to truth,
inner peace, enlightenment, and other such delights. -- Me



From [e-mail] Sat Jul 27 19:18:45 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!nntp.primenet.com!news.cais.net!mr.net!winternet.com!n1ott.istar!ott.istar!istar.net!tor.istar!east.istar!news
From: A Guy named Moe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment
Subject: Packet Modems
Date: Thu, 25 Jul 1996 14:06:40 -0700
Organization: **************
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: burgessville-122.oxford.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5a (Win16; I)
Xref: news2.epix.net rec.radio.amateur.homebrew:16252 rec.radio.amateur.antenna:23399 rec.radio.amateur.equipment:31314

Does  anyone know how they work and were to get inforation on the net.
I can not go to a local book store because there is not one near by.


From [e-mail] Sat Jul 27 19:18:46 1996
Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news
From: A Guy named Moe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: TV station
Date: Sun, 21 Jul 1996 17:46:04 -0700
Organization: **************
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: burgessville-137.oxford.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5a (Win16; I)

I was thinking of seting up a TV station using a video camera microphone
and VCR.  anyone know where to get plans to build a transmiter and
information on a antanna?


From [e-mail] Sat Jul 27 19:18:46 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!in2.uu.net!psinntp!psinntp!psinntp!psinntp!usenet
From: [e-mail](Art)
Newsgroups: rec.radio.amateur.homebrew
Subject: SPELLING PLEASE
Date: 25 Jul 1996 22:02:59 GMT
Organization: Pipeline
Lines: 4
Message-ID: <4t8quj$[e-mail]>
NNTP-Posting-Host: 38.8.120.9
X-PipeUser: art2
X-PipeHub: usa.pipeline.com
X-PipeGCOS: (Art)
X-Newsreader: Pipeline v3.5.0

For the life of me I can't understand why full fledged
hams insist on spelling  "reciever" instead of "RECEIVER".

73's de Art


From [e-mail] Sat Jul 27 19:18:47 1996
Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news
From: A Guy named Moe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Scanners & Short wave equipment
Date: Sun, 21 Jul 1996 17:47:53 -0700
Organization: **************
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: burgessville-137.oxford.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5a (Win16; I)

I was wondering if anyone knows were to get plans to build short wave
equipment and scanners and the antannas


thanks


From [e-mail] Sat Jul 27 19:18:48 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-13.sprintlink.net!nntp.primenet.com!news.cais.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!cs.utexas.edu!howland.reston.ans.net!nntp.crl.com!usenet
From: [e-mail] (John)
Newsgroups: rec.radio.amateur.homebrew
Subject: helical resonators
Date: Sun, 21 Jul 1996 22:40:38 GMT
Organization: CRL Dialup Internet Access
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: 206.245.244.7
X-Newsreader: Forte Free Agent 1.0.82

I am looking for some plans on how to build a 2-meter helical
resonator (band pass).

John
KE6ZUZ



From [e-mail] Sat Jul 27 19:18:49 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!worldlinx.com!clio.trends.ca!winternet.com!mr.net!visi.com!news
From: Bob Liesenfeld <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Heath GR-78
Date: Sun, 21 Jul 1996 22:29:13 +0600
Organization: none
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: 192-45.dynamic.visi.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; I)

Hi,
  I'm looking for a schematic/manual for a Heathkit GR-78 receiver. I'll pay
costs etc.
Thank you!

   Bob L.       [e-mail]


From [e-mail] Sat Jul 27 19:18:49 1996
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!hsno.wco.com!news.wco.com!news
From: [e-mail] (Kay Fule)
Newsgroups: rec.radio.amateur.homebrew
Subject: TV-Radio
Date: Sun, 21 Jul 1996 19:21:19 GMT
Organization: West Coast Online's News Server - Not responsible for content
Lines: 6
Message-ID: <31f282f5.826665392@199.4.94.14>
NNTP-Posting-Host: ts03.tidepool.com
X-Newsreader: Forte Agent .99d/32.182

I heard it was possible to make a ham radio out of a Tv. Anyone here
know how?

Thanks
[e-mail]



From [e-mail] Sat Jul 27 19:18:50 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cableol.net!news-lond.gsl.net!news.gsl.net!tank.news.pipex.net!pipex!iol!usenet
From: gerrad madden <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 2meter 250-1kw urgently wanted
Date: 23 Jul 1996 14:34:10 GMT
Organization: Ireland On-Line
Lines: 7
Message-ID: <4t2nt2$[e-mail]>
NNTP-Posting-Host: dialup-003.limerick.iol.ie

2meter 250-1kw amplifer wanted urgently.
Homebrew will be considered.


Mail to Tony

[e-mail]


From [e-mail] Sat Jul 27 19:18:51 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!portal.gmu.edu!newsfeed.internetmci.com!psgrain!rainrgnews0!news.cenornet.com!usenet
From: Tate Gordinier <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: CB radio crystal modification
Date: Mon, 22 Jul 1996 16:03:19 -0700
Organization: CenORneT Access Services
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp1.cenornet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win95; U)

I have been going crazy trying to find any way to add or change
frequencies in a Uniden Pro 510xl, if that is possible.  Is it possible
to do this by just using different crystals, or would using a different
crystal mess up the PLL chip? (The PLL is a sm5124.)  Thanks in advance
for any help.

Tate
[e-mail]


From [e-mail] Sat Jul 27 19:18:52 1996
Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.cetlink.net!usenet
From: "vigilant" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Antenna for 2 Meters
Date: Sat, 20 Jul 1996 18:01:56 -0400
Organization: MJS Enterprises
Lines: 9
Message-ID: <01bb7687.4b21f600$d3681fce@mjs-enterprises>
References: <4soucp$[e-mail]> <4srcfl$[e-mail]>
NNTP-Posting-Host: rhsc-211.cetlink.net
X-Newsreader: Microsoft Internet News 4.70.1085

take an so-239 and make a 2m groundplane antenna......get it up as high as
you can and feed it with the lowes loss coax you have.....you should able
to hit paket stations......

> >     I have quite a bit of experience with building HF antennas but zero
> >     experience with VHF. Anyone have any suggestions?
> >     Thanks
> >     Dave LeDuc K1EPJ



From [e-mail] Sat Jul 27 19:18:52 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!insync!news
From: [e-mail] (erikc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Helical Filters
Date: Thu, 25 Jul 1996 16:44:16 GMT
Organization: bugshit.nutso.com
Lines: 9
Message-ID: <4t880n$[e-mail]>
NNTP-Posting-Host: dialup-164-161.insync.net
X-Newsreader: Forte Free Agent 1.0.82

Can anybody out there explain to me what a "helical filter"
is and how it works.  This is a new one on me.  Thanks.

Erikc


Religious fundamentalists are a plague sent by God to
punish us for our joys. -- me



From [e-mail] Sat Jul 27 19:18:53 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.dgsys.com!en.com!in-news.erinet.com!ddsw1!news.mcs.net!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!math.ohio-state.edu!uwm.edu!spool.mu.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!tir.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP 3-Bander from 10/89 QST
Date: 27 Jul 1996 14:50:06 GMT
Organization: The Internet Ramp
Lines: 9
Message-ID: <4tdaau$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: an194.tir.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

I second the idea of building the Sierra!  It does require some
experience to build.  The result is a radio that works and has
the few features one needs - small, multi-band, RIT when you want it,
good bandpass filter, .....

I added the frequency counter/keyer kit - it works very well.

Enjoy.    N8TT



From [e-mail] Sat Jul 27 19:18:54 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!hunter.premier.net!netnews.worldnet.att.net!arclight.uoregon.edu!enews.sgi.com!wdl1.wdl.lmco.com!enterprise!pax!jeffa
From: [e-mail]
Subject: Re: Prototyping boards for SMD?
Message-ID: <[e-mail]>
Sender: (null)@(null) ((null))
Organization: Space Systems Loral
References: <[e-mail]> <[e-mail]>
Date: Wed, 24 Jul 1996 19:06:43 GMT
Lines: 11

If you have an old HP style pen plotter and a CAD or drawing package that can
output to it, you can use a special ink pen (forget the part number; I have it
 at
home) to draw a single sided board for mounting the SMD parts. I've gotten as
good as .015" C-C spacing without ink bridging. Pullout your Radio Shack speci
al
FeCl etchant, Ammonium persulfate solution, or even old sulfuric acid and etch
the board. For QFP's and other small C-C parts (or large pin count parts), it'
s
real nice to pre-tin the board. I suggest using the various Stannous Chloride
electroless flash solutions that are available (I remember G.C. (sic?) from
Canada makes one; ~1 qt. for ~$10 several years ago). After tinning, flux the
board. I use X-32 low residue flux; not rosin based fluxes. Use a small iron
(such as a Oryx) and small diameter solder (flux core) on each pin.


From [e-mail] Sat Jul 27 19:18:55 1996
Path: news2.epix.net!uunet!in2.uu.net!hunter.premier.net!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!sdd.hp.com!col.hp.com!jms
From: [e-mail] (Mike Stansberry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SPELLING PLEASE
Date: 26 Jul 1996 13:28:28 GMT
Organization: HP Colorado Springs Division
Lines: 11
Message-ID: <4tah5s$[e-mail]>
References: <4t8quj$[e-mail]>
NNTP-Posting-Host: mssjms.col.hp.com
X-Newsreader: TIN [version 1.2 PL2]

Art ([e-mail]) wrote:
: For the life of me I can't understand why full fledged
: hams insist on spelling  "reciever" instead of "RECEIVER".
:
: 73's de Art

I'm with you, Art.  But may I point out that '73' means 'best regards'
That make the above 'best regards's'

73, de Mike



From [e-mail] Sat Jul 27 19:18:56 1996
Path: news2.epix.net!uunet!inXS.uu.net!news.PBI.net!usenet
From: [e-mail] (Gus Peabody)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: Schematic for Heath GR-81 Regen SW recvr
Date: 21 Jul 1996 18:30:02 GMT
Organization: Sport Sushi Co
Lines: 12
Message-ID: <4stsva$[e-mail]>
NNTP-Posting-Host: ppp-3-30.okld03.pacbell.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

I picked up this Heathkit shortwave regenerative receiver GR-81 and I'd
like to restore it to working condition.  It has a few parts that look
like they were added on after it was built. It is also missing two
tubes and there is no marking on the chassis to indicate their
identity.

Be glad to pay for copying and shipping if any one has documentation
on this device, or if there is an archive site of Heathkit schematics,
I'd appreciate that Info as well.

Thanx...Gus



From [e-mail] Sat Jul 27 19:18:57 1996
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.kei.com!news.texas.net!newsfeed.concentric.net!news2.acs.oakland.edu!jobone!fiesta.srl.ford.com!pt9201.ped.pto.ford.com!usenet
From: Jeff King <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to detect WHICH PL tone receiving?
Date: Mon, 22 Jul 1996 16:34:13 -0700
Organization: Ford Motor Co., Powertrain Electronics
Lines: 12
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: itc478.ccd.ford.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; I)

David Feldman wrote:

> So the question is: are there any published circuits (chip or circuit
> level) that would output a digital word (5-6 bits?) based on which PL
> tone is in the received signal at a given instant in time?
>
> 73 Dave WB0GAZ [e-mail]

Check out MX-COM. They make a number of CTCSS decoders, one of which
I'm sure could be adapted to your needs.

-Jeff WB8WKA


From [e-mail] Sat Jul 27 19:18:58 1996
Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newsstand.cit.cornell.edu!news.acsu.buffalo.edu!news.drenet.dnd.ca!crc-news.doc.ca!nott!standby.nrc.ca!NewsWatcher!user
From: [e-mail] (Peter Orban)
Newsgroups: rec.radio.amateur.homebrew
Subject: 455KHz 500Hz CW filter
Date: Fri, 26 Jul 1996 08:53:28 -0400
Organization: NRC
Lines: 12
Message-ID: <peter.orban-2607960853290001@132.246.72.31>
NNTP-Posting-Host: 132.246.72.31

A friend of mine is looking for the above filter for a Kenwood TS 450S AT
ham radio. Are these filters expensive? (I have not received any quotes
from supplyers yet.)
How are such filters implemented, are those quartz, ceramic or mechanical
filters? Any chance to homebrew one?
Any comments welcomed!

Thanks, Peter
--
Peter Orban
National Research Council of Canada
[e-mail]


From [e-mail] Sat Jul 27 19:18:59 1996
Path: news2.epix.net!uunet!inXS.uu.net!ott.istar!istar.net!tor.istar!east.istar!news
From: Douglas Berry <[e-mail]>
Newsgroups: sci.electronics.repair,rec.radio.amateur.homebrew
Subject: Remote Door Lock Transmitter for GM Car
Date: 22 Jul 1996 16:42:09 GMT
Organization: iSTAR internet Incorporated
Lines: 13
Message-ID: <4t0b11$[e-mail]>
NNTP-Posting-Host: 207.81.101.91
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)
Xref: news2.epix.net sci.electronics.repair:29974 rec.radio.amateur.homebrew:16239

I have a remote door lock transmitter for a Oldsmobile Royale that is not
unlocking the doors. I'am trying to determine if it is the transmitter or
the reciever in the car. My question is, does anyone no the frequencies
that GM use in there remote transmitters. Using the Scope I tested the
crystal and found that it is oscillating. Any help would be appreciated.

Thanks

Douglas Berry

Email:    [e-mail]
Packet:   VA3DMB@VE3IJD.#CON.ON.CAN.NOAM



From [e-mail] Sat Jul 27 19:18:59 1996
Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!swrinde!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!bt!usenet
From: Paul Beastall <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: High voltage transformers
Date: 25 Jul 1996 15:29:55 GMT
Organization: BT Labs
Lines: 13
Message-ID: <4t83tj$[e-mail]>
NNTP-Posting-Host: pc1.garden.bt.co.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

I'm trying to find a transformer suitable for a pair of 3cx800a7 triodes
and in the UK I would have to have one made as a special.

I understand that in the States there may be some off the shelf options
(Peter Dahl or Avatar Magnetics?). Does anyone have any details or can
they point me in the right direction?

Thanks

Paul Beastall, G1WBZ
Ipswich, UK.




From [e-mail] Sat Jul 27 19:19:00 1996
Path: news2.epix.net!uunet!in2.uu.net!cs.utexas.edu!newshost.convex.com!cnn.exu.ericsson.se!erinews.ericsson.se!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 144Mhz 4cx250 PA
Date: 22 Jul 1996 11:25:50 GMT
Organization: Mobile Telephone Systems PDC
Lines: 14
Message-ID: <4svofu$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: kicc16.eraj.ericsson.se

I am looking for articles on 144MHz final
amplifiers, that is - more or less complete
features on projects to complete a PA,
I am short of descriptions of the RF bits.
The choice is a pair of 4cx250 (B?) for SSB use
or a 4cx350.

Anyone with some good references in ham magazines
recently (or ancient ?)

Chris sm0ncl
--




From [e-mail] Sat Jul 27 19:19:01 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.comm.net!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (K5QQ)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ICOM R-7000 12 VOLT DC OPERATION
Date: 23 Jul 1996 08:45:47 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 14
Sender: [e-mail]
Message-ID: <4t2hhr$[e-mail]>
References: <4sk2mk$[e-mail]>
Reply-To: [e-mail] (K5QQ)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi Bill

I have the cable and I think that is all ICOM is selling you for the $30.
To run it on 12 VDC, you remove the "jumper" plug out of the back and plug
the 12 VDC in there.  I think the pin at the top of the triangle is the
+12 in and the bottom is the ground.

When the set runs off of 110 volts, the power supply inside puts 12 volts
on the 2nd pin and the jumper takes it up to the top pin.

Works great in my car, I just hate to take that much radio for a ride just
sitting on the seat!!

Jim  [e-mail]


From [e-mail] Sat Jul 27 19:19:02 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.nevada.edu!news.tamu.edu!bcm.tmc.edu!pendragon!ames!elroy.jpl.nasa.gov!news.msfc.nasa.gov!newsfeed.internetmci.com!cdc2.cdc.net!vixen.cso.uiuc.edu!usenet
From: Carl Gregory <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: schematics of a transverter 28 Mhz <-> 50 Mhz wanted
Date: Tue, 23 Jul 1996 11:34:08 -0500
Organization: University of Illinois at Urbana
Lines: 14
Message-ID: <[e-mail]>
References: <4t2i3s$[e-mail]>
NNTP-Posting-Host: mapper.beckman.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Macintosh; I; PPC)
To: erwin cremers <[e-mail]>

erwin cremers wrote:
>
> Hello,
>
> I'm looking for schematics to build a transverter 28 Mhz <-> 50 Mhz.
>
> If you have any information please let me know,

Ten-Tec sells such a converter kit.  I bought one at Dayton for about
$10 US.  It's just a 4cm square PCB - no case or connectors - so it can
easily be mounted inside the 28MHz IF radio.

73!
Carl, K8CG


From [e-mail] Sat Jul 27 19:19:03 1996
Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:Regency RTE202
Date: 22 Jul 96 14:26:03 GMT
Organization: ucsd usenet gateway
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Don asked about modifying this radio to 900 MHz.  If it is the same
model of business band radio that I have several of, it will be a
difficult task if you keep the duplexor.  I basically cannibalized one
of them to see what makes it tick.  It has a lot of nice parts that
could be used to make a 900 MHz radio, though.

The best part is that I have a *complete* service manual for whatever
model it is I have.  The manual and radios are at home right now.
I'll try to look tonight.

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



From [e-mail] Sat Jul 27 19:19:04 1996
Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newshub.csu.net!newsserver.sdsc.edu!usenet
From: [e-mail] (Stewart Teaze)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: Z8530 SCC
Date: 23 Jul 1996 16:38:57 GMT
Organization: ASI
Lines: 15
Message-ID: <4t2v71$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 141.248.174.218
X-Newsreader: WinVN 0.92.1
Xref: news2.epix.net rec.radio.amateur.digital.misc:16585 rec.radio.amateur.homebrew:16247

In article <[e-mail]>, John Clark <clarkjc@cr
aft.camp.clarkson.edu> says:
 >
 >Does anyone know where I can purchase one of these ICs?  I can't seem to
 >find it from anywhere I normally order from....  (Either the Zilog or
 >AMD version is fine...)  Thanks.
 >
 >- John

My Newark catalog has Z8530 family parts.

It appears you are from Clarkson College, which seems to be
in Potsdam, NY(the sticks).  They have a Syracuse,NY branch
at [phone].  If this is not close to you, you can call
information for any moderately-sized city, and get the Newark
branch telephone number.


From [e-mail] Sat Jul 27 19:19:04 1996
Path: news2.epix.net!uunet!in2.uu.net!cs.utexas.edu!howland.reston.ans.net!EU.net!sun4nl!usenet
From: [e-mail] (erwin cremers)
Newsgroups: rec.radio.amateur.homebrew
Subject: schematics of a transverter 28 Mhz <-> 50 Mhz wanted
Date: Tue, 23 Jul 1996 14:06:49 GMT
Organization: NLnet
Lines: 16
Message-ID: <4t2i3s$[e-mail]>
NNTP-Posting-Host: utr99-178.utrecht.nl.net
X-Newsreader: Forte Free Agent 1.0.82


Hello,

I'm looking for schematics to build a transverter 28 Mhz <-> 50 Mhz.

If you have any information please let me know,

Greetings 73's


///////////\\\\\\\\\\
     Erwin Cremers
 Dutch Radio Operator
        PE1MGR
\\\\\\\\\\\///////////



From [e-mail] Sat Jul 27 19:19:05 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.mathworks.com!newsfeed.internetmci.com!in3.uu.net!news.interlog.com!news
From: James Brooks <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment,sci.electronics.repair,sci.electronics.equipment,sci.electronics.design,sci.electronics.misc
Subject: Re: High and low Frequence Antannas
Date: Sat, 27 Jul 1996 13:19:22 -0700
Organization: Drastic Technologies
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]> <4tar39$[e-mail]>
NNTP-Posting-Host: jbrooks.interlog.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I; 16bit)
Xref: news2.epix.net rec.radio.amateur.homebrew:16266 rec.radio.amateur.antenna:23426 rec.radio.amateur.equipment:31354 sci.electronics.repair:30093 sci.electronics.equipment:4236 sci.electronics.design:10293 sci.electronics.misc:8151

Bob Wilson wrote:
>
>> A Guy named Moe ([e-mail]) wrote:
>> : Where can i get information on different types of antannas, how to
>>build
>> : them and how they work?
>
> Try the ARRL Handbook.
>
> Bob.

He really should learn to use a search engine.

Patrick Rea




From [e-mail] Sat Jul 27 19:19:06 1996
Path: news2.epix.net!uunet!in2.uu.net!cdc2.cdc.net!news.texas.net!news.kei.com!uhog.mit.edu!news.mtholyoke.edu!nntp.et.byu.edu!news.byu.edu!news
From: [e-mail] (Richard Christensen)
Newsgroups: rec.radio.amateur.homebrew
Subject: PCB resources
Date: 25 Jul 1996 20:52:18 GMT
Organization: Brigham Young University, Provo UT USA
Lines: 17
Distribution: world
Message-ID: <4t8mq2$[e-mail]>
NNTP-Posting-Host: spock.et.byu.edu
X-Newsreader: Tin 1.1 PL5

I am interested in making some projects for myself. Does anyone
have knowledge of what is available in the way of cheap tools,
ie: simulators, routers, placers, schematic capture, and pcb makers.

One project I want to do will require a lot of drilling, so I
really don't want to do this board myself at home.


--
         /\                  /\       .       /\____
 _-_    /  \       _/\      /  \     /\      /      \        /\
/   \  /    \     /   \  /\/    \   /  \_/\_/   Y    \  /\/\/  \
  u  \/      \___/     \/        \ /                  \/        \
----------------------------------v--------------------------------
Richard Christensen                                          KC7JPQ
[e-mail]                 Go Cougars!! Beat Utah!!!



From [e-mail] Sat Jul 27 19:19:07 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-fw-12.sprintlink.net!news.inc.net!newspump.sol.net!newsfeeder.sdsu.edu!newshub.sdsu.edu!news2.cais.net!news.cais.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!elroy.jpl.nasa.gov!decwrl!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!asic.enet.dec.com!randolph
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: *NEED HELP TO REBIAS LO VHF MICOR
Date: 22 JUL 96 12:17:21
Organization: Digital Equipment Corporation
Lines: 18
Message-ID: <4t0a6p$[e-mail]>
References: <4sreqq$[e-mail]>
NNTP-Posting-Host: bootnd.enet.dec.com


In article <4sreqq$[e-mail]>, [e-mail].N
ET writes...
>I WANT TO REBIAS A LOW VHF MOTOROLA MICOR , 50MHZ, FROM C TO AB1.
>ANYONE DONE THAT?  PLAN TO BYPASS PREAMP SECTION AND DRIVE FINALS
>DIRECTLY AS HAVE 10 WATT DRIVE ALREADY.  73 MIKE

Haven't done it, but I've always thought it might make a good, cheap way to
build a 100W linear for HF QRP rigs. 0.7V forward bias from a silicon
rectifier applied to the bases of the final transistors, and a little feedback
from collector to base to stabilize and to flatten the gain across the HF
spectrum would probably do it. It might require adding a cap here and there if
the transformer windings would short your bias to ground.

Good luck, let us know if you succeed!

==============================================================================
Tom Randolph  N1OOQ  NE-QRP 419  QRP-L 87  ARRL     [e-mail]
==============================================================================


From [e-mail] Sat Jul 27 19:19:08 1996
Path: news2.epix.net!uunet!in2.uu.net!news.inc.net!newspump.sol.net!spool.mu.edu!howland.reston.ans.net!EU.net!chsun!news.eunet.ch!ascomax.hasler.ascom.ch!usenet
From: Robert Ganter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Digital Microwave Radio
Date: Mon, 22 Jul 1996 10:22:20 +0200
Organization: Ascom Business Systems AG
Lines: 19
Message-ID: <[e-mail]>
References: <4smur8$[e-mail]> <4snmlr$[e-mail]>
NNTP-Posting-Host: pcts72.ens.ascom.ch
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win16; I)
Xref: news2.epix.net rec.radio.amateur.homebrew:16226 rec.radio.amateur.digital.misc:16567

Bob Merritt wrote:
>
> [e-mail] (Nick Kralevich) wrote:
>
> >Does anyone know of a design for a digital microwave transmitter/receiver
> >combo that is available on the internet or in book form?  Or
> >perhaps I'm going about this in the wrong direction...
>
> Go to the nearest ham radio store and buy a copy of the ARRL Handbook
> for Radio Amateurs and then read up on the 10Ghz Gunnplexor/2MBPS
> project....Oops, wait a moment, this article is not any more in the ARRL Han
dbook
anymore! It can be found in another book published by the ARRL. Can't
tell You which at the moment, because I have the books at home. Maybe
somebody else can help here?
Or try http://www.arrl.org

Regards

Robert (HB9NBY)


From [e-mail] Sat Jul 27 19:19:09 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.zeitgeist.net!news.sfo.com!news.cais.net!van-bc!unixg.ubc.ca!info.ucla.edu!psgrain!qiclab.scn.rain.com!toledotel.com!rainrgnews0!news.cenornet.com!usenet
From: Tate Gordinier <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Video Transmiter
Date: Mon, 22 Jul 1996 16:21:19 -0700
Organization: CenORneT Access Services
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ppp1.cenornet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win95; U)
To: A Guy named Moe <[e-mail]>

A Guy named Moe wrote:
>
> Does anyone know or have plans to build a Video transmiter???
>
> thanks

There is a two-part article starting in the July 1994 issue of
Electronics Now magazine, you could probably find it at most public
libraries. The article has schematics, parts lists, building and
adjusting instructions, and circut board layout plans for several
different transmitters and a reciever.  There are plans for a 5-watt 3
channel audio/video transmitter, a 3/4 watt audio video transmitter, a
3/4 watt video only transmitter, and a reciever that will go directly to
a TV.  The article also gives a company that sells kits.
        I am in the process of building a 3/4 watt transmitter from the
plans and have had some problems finding a few transistors, but most of
the parts are readily available through mail order catalogs.
        I hope any of this is helpfull

Tate
[e-mail]


From [e-mail] Sat Jul 27 19:19:10 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newsstand.cit.cornell.edu!intac!hobbs!cono
From: [e-mail] (CONO)
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew
Subject: FS: Yeasu FT-757GX CAT HF RIG
Message-ID: <[e-mail]>
Date: Tue, 23 Jul 96 14:47:00 -0400
Distribution: world
Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-7307
Reply-To: [e-mail] (CONO)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 21
Xref: news2.epix.net rec.radio.swap:70630 rec.radio.amateur.homebrew:16238

I have forsale a Yeaseu FT-757GX Cat HF Radio and External Antenna Tuner, Heav
y
duty power supply in MINT Condition! 1000.00 OBO call 201-440-6566

FT-40/41 440 HT forsale, has Quick Charger (NC-50) and exter 5 watt Battery.
$275.00 for the radio $75.00 for the quick charger. $30.00 for the FNB41 5 wat
t
battery.

I would consider a trades for:

 A Kenwood TS-940AT in Good working order.
 A Yeasu FT1000 in Good working order.

CALL 201-440-6566

[e-mail]

             ......oooooOOOOOo         http://www.intac.com/~cono
     ___,-----.----+_________#_     The Roy Hobbs BBS [e-mail]
     |________| |__|___________}          Node 1: 201-641-7307
      ooooo oo ~ ooO-O-O-O == oo\         Node 2: 201-641-3126



From [e-mail] Sat Jul 27 19:19:11 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!netnews.worldnet.att.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Digital Microwave Radio
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4smur8$[e-mail]> <[e-mail]> <4sosqb$[e-mail]> <4sq1c9$[e-mail]> <[e-mail]>
Date: Thu, 25 Jul 1996 17:27:33 GMT
Lines: 21
Sender: [e-mail]
Xref: news2.epix.net rec.radio.amateur.homebrew:16259 rec.radio.amateur.digital.misc:16599

in <[e-mail]>, Will Flor wrote:
: Definitely true; however, the original poster was discussing
: homebrewing components, which is incompatible with legal
: operation under Part 15 (unless you're willing to fork over
: Big Buck$$ to have your homebrew design type-certified by the
: FCC.)

Wrong.  There's a hobby exclusion in part 15.  (At least as of the
October 1991 copy I have on my desk.)

"15.23 Home-built devices.

(a) Equipment authorization is not required for devices that are
not marketed, are not constructed from a kit, and are built in
quantities of five or less for personal use."  ...

And subparagraph b is about using "good engineering practice" where
the home builder is not able to test for full compliance.

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



From [e-mail] Sat Jul 27 19:19:12 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!info.ucla.edu!nnrp.info.ucla.edu!zephyr!hansen
From: [e-mail] (Christopher J Hansen)
Subject: Re: Digital Microwave Radio
Sender: [e-mail] (News Daemon)
Message-ID: <[e-mail]>
Date: Wed, 24 Jul 1996 19:40:14 GMT
X-Nntp-Posting-Host: dantzig.ee.ucla.edu
References: <4smur8$[e-mail]> <[e-mail]> <4sosqb$[e-mail]> <4sq1c9$[e-mail]> <[e-mail]>
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Will Flor ([e-mail]) wrote:

: Definitely true; however, the original poster was discussing
: homebrewing components, which is incompatible with legal
: operation under Part 15 (unless you're willing to fork over
: Big Buck$$ to have your homebrew design type-certified by the
: FCC.)

: 73 de KB9JTT

This is true.  Home-brewing a device to operate under Part 15 is not
practical.  Amateur radio is really the only practical way to home
brew any type of radio transmitter, except extremely low power.
If the application is illegal under the amateur radio rules then give
up and find something else to do.  There are many things in this
world to experiment with.  It's a bad idea to get fixated on one
application (except, of course, VHF contesting) unless someone
is paying you.

Chris Hansen, KQ6DW
(also formerly in W2SZ)



From [e-mail] Sat Jul 27 19:19:12 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!news.cais.net!world1.bawave.com!newsfeed.internetmci.com!uwm.edu!news.nap.net!fred.enteract.com!ix.netcom.com!news
From: AC6V <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TV Frequinces
Date: Wed, 24 Jul 1996 06:06:01 -0700
Organization: Author
Lines: 24
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: esc-ca1-22.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Wed Jul 24  6:05:44 AM PDT 1996
X-Mailer: Mozilla 2.01 (Win95; U)
To: A Guy named Moe <[e-mail]>

A Guy named Moe wrote:
>
> How can I find out the frequences that TV stations are using?


Yo Moe! Go to URL:

http://www.planet.net/fccindex/10_khz.html#30_MHz

This is for on the air channels.

For Cable Frequencies, go to:

http://www.planet.net/fccindex/cablech.html

Best Regards from San Diego

Rod

I transmit, therefore I am, I think!!
--
Hark for I have hurled my words to the far reaches of the earth!
What King of old could do thus??
..... AC6V


From [e-mail] Sat Jul 27 19:19:13 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!nntp.coast.net!zombie.ncsc.mil!newsgate.duke.edu!agate!info.ucla.edu!newsfeed.internetmci.com!news.kei.com!news.texas.net!nntp.primenet.com!news.cais.net!mr.net!winternet.com!tclbbs.com!jim.hammock
From: [e-mail] (Jim Hammock)
Newsgroups: rec.radio.amateur.homebrew
Subject: wanted schematic for pro
Date: Fri, 26 Jul 1996 05:16:00 GMT
Message-ID: <[e-mail]>
Organization: The City Lights BBS
Distribution: world
Lines: 24

On 07-19-96 16:14, [e-mail] was talking to ALL
 about wanted schematic for pro:

PE>From: [e-mail] (Peter L. Williamson)
PE>Newsgroups: rec.radio.amateur.homebrew
PE>Subject: wanted schematic for pro-2023 scanner
PE>Organization: ucsd usenet gateway

PE>Can anybody help me with a schematic for the Tandy (Radio Shack) scanne
PE>model pro-2023?
PE>Tnx. Peter VK4AWP.


If the model is the PRO-23 you can order the service manual from Radio Shack
using RSU number 10823375. You can get a parts lis faxed to you by calling
1-800-323-6586, following the directions and entering 21375 for the docuent
number.

Hope it helps!


Jim KI0DN
---
 * PW * Old days: Wine, Women, Song. Now days: Coffee, Computers,


From [e-mail] Sat Jul 27 19:19:14 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.megalink.net!imci4!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!news
From: Charlie Panek <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source of Ferrite Beads?
Date: Mon, 22 Jul 1996 16:34:04 -0700
Organization: Hewlett-Packard Co.
Lines: 26
Message-ID: <[e-mail]>
References: <[e-mail]>
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (X11; I; HP-UX A.09.05 9000/715)
To: fiz <[e-mail]>

fiz wrote:
>
> Hi,
>
> Can anyone recommend a place to get ferrite beads big enough to slip over
> RG-58? They don't need to slip over the BNC connector, only the cable,
> 0.2" OD.
>
> ttfn fiz (KG0YG)

  Unfortunately FT-43-XX cores are just a little too small to fit ober
RG-58, so you'd need to get FT-50 cores.  I think for RFI supression/
choking at HF, a -43 or -77 mix is what you want.

  Dan's Small Parts has prices on Ferrite cores that are much better
than Amidon or Palomar. (FT-50-43 are 3/$1.25) Check out his catalog:
http://www.fix.net/dans.html

  (I have no affiliation with Dan's Small Parts, except that I just
placed an order for some cores from him... We'll see if they arrive ok)


--
Charlie Panek                   Hewlett Packard Company
[e-mail]            Lake Stevens Division
                                Everett, Washington


From [e-mail] Sat Jul 27 19:19:17 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!EU.net!Belgium.EU.net!chaos.kulnet.kuleuven.ac.be!usenet
From: [e-mail] (Peter Delmotte)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Digital Microwave Radio - 1200bps stinks!
Date: 24 Jul 1996 16:07:36 GMT
Organization: K.U.Leuven
Lines: 26
Message-ID: <4t5ho8$[e-mail]>
References: <4smur8$[e-mail]> <[e-mail]> <4t0gmh$[e-mail]> <[e-mail]> <[e-mail]>
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Mime-Version: 1.0
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X-Newsreader: WinVN 0.99.5

In article <[e-mail]>, [e-mail]
says...
>
:Gary ,Could you please educate me . Having read an article in QST on
:'ready for 9600Baud'FM radios ,I understood that all the
:Yaesu-Kenwood-Icom-etc VHF/UHF radios, ready for 9600Baud, had a
:separate TNC output port which in fact inputs the TNC output directly
:to the varactor circuit ,thus bypassing the '300-3000Hz conditioned
:mike amp '. This is because the 9600Baud signal audio spectrum runs
:from very low to approx 7200Hz.(?)
:I can't imagine that the 9600Baud connection on some rigs is a fake,
:although some rigs appear to have a lower Bit Error Rate (BER) than others.
:Frank Dinger , Inver by Tain , Ross-shire - Scotland UK
:

Even with an input directly to the varactor circuit, there still is
a problem: the PLL.  It doesn't do to much to the higher frequencies,
but the lower ones (e.g. below 300Hz) are filtered out by the PLL, trying
to keep the frequency "right".  Only a modulator _outside_ the PLL loop
can give you a flat frequency response down to DC. (I admit, you don't
need DC, but the lower you get, the better.)  In my opinion, the best
9600 radios are multi-mode rigs with a fixed-frequency modulator (no PLL!),
fed into a mixer.

Peter



From [e-mail] Sat Jul 27 19:19:19 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.clark.net!world1.bawave.com!news2.cais.net!news.cais.net!hunter.premier.net!news.uoregon.edu!arclight.uoregon.edu!dispatch.news.demon.net!demon!zetnet.co.uk!usenet
From: Frank Dinger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Digital Microwave Radio - 1200bps stinks!
Date: Tue, 23 Jul 1996 22:59:04 +0100
Lines: 29
Message-ID: <[e-mail]>
References: <4smur8$[e-mail]> <[e-mail]> <4t0gmh$[e-mail]> <[e-mail]>
NNTP-Posting-Host: piccadilly.zetnet.co.uk
X-Mailer: ZIMACS Version 1.09u 10001740

---------snipped
> Except for a couple of purpose made data radios, 9600 baud is
> going to require modifications to a FM voice radio to work
> (despite radio manufacturer advertising hype of "9600 baud
> ready" included with virtually every new radio marketed,
> which really only means they included a jack labeled "data"
> on the back panel). Joe HT isn't going to do those modifications,
> and anybody capable of doing them is also capable of going to
> the next level. So I see 9600 baud over FM voice radios as a
> dead end. (If the manufacturers ever *really* make their radios
> "9600 baud ready", then that would be a different story.)
---------snipped

> Gary Coffman KE4ZV

------------------
Gary ,Could you please educate me . Having read an article in QST on
'ready for 9600Baud'FM radios ,I understood that all the
Yaesu-Kenwood-Icom-etc VHF/UHF radios, ready for 9600Baud, had a
separate TNC output port which in fact inputs the TNC output directly
to the varactor circuit ,thus bypassing the '300-3000Hz conditioned
mike amp '. This is because the 9600Baud signal audio spectrum runs
from very low to approx 7200Hz.(?)
I can't imagine that the 9600Baud connection on some rigs is a fake,
although some rigs appear to have a lower Bit Error Rate (BER) than others.
Frank Dinger , Inver by Tain , Ross-shire - Scotland UK
e-mail :  [e-mail]
Packet :  GM0CSZ @ GB7NOS.#76.GBR.EU



From [e-mail] Sat Jul 27 19:19:21 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.coast.net!sgigate.sgi.com!newsfeeder.sdsu.edu!in-news.erinet.com!ddsw1!news.mcs.net!nntp.primenet.com!news.cais.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Digital Microwave Radio
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4smur8$[e-mail]> <4snmlr$[e-mail]> <[e-mail]>
Date: Mon, 22 Jul 1996 16:08:35 GMT
Lines: 30
Xref: news2.epix.net rec.radio.amateur.homebrew:16218 rec.radio.amateur.digital.misc:16559

In article <[e-mail]> Robert Ganter <[e-mail]> wri
tes:
>Bob Merritt wrote:
>>
>> [e-mail] (Nick Kralevich) wrote:
>>
>> >Does anyone know of a design for a digital microwave transmitter/receiver
>> >combo that is available on the internet or in book form?  Or
>> >perhaps I'm going about this in the wrong direction...
>>
>> Go to the nearest ham radio store and buy a copy of the ARRL Handbook
>> for Radio Amateurs and then read up on the 10Ghz Gunnplexor/2MBPS
>> project....Oops, wait a moment, this article is not any more in the ARRL Ha
ndbook
>anymore! It can be found in another book published by the ARRL. Can't
>tell You which at the moment, because I have the books at home. Maybe
>somebody else can help here?
>Or try http://www.arrl.org
>
>Regards
>
>Robert (HB9NBY)

It's now in _Packet, Speed and More Speed_ also published by the ARRL.
Good book.

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


From [e-mail] Sat Jul 27 19:19:23 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!news.cais.net!van-bc!news.mindlink.net!sol.ctr.columbia.edu!news.ess.harris.com!usenet
From: Paul Anderson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Helical Filters
Date: Thu, 25 Jul 1996 14:38:45 -0400
Organization: Harris Corp
Lines: 33
Message-ID: <[e-mail]>
References: <4t880n$[e-mail]>
NNTP-Posting-Host: pander01.ess.harris.com
Mime-Version: 1.0
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erikc wrote:
>
> Can anybody out there explain to me what a "helical filter"
> is and how it works.  This is a new one on me.  Thanks.
>

Sometimes they are also called helical resonators.

Generally, one consists of a cavity (a metal can), a coil (inside the
cavity, connected to it at one end, and unconnected at the other end),
and a tuning screw (usually running down thru the coil).  At the helical
filter's resonant frequency, it's inductive reactance (inductance from
the coil) will cancel it's capacitive reactance (capacitance between the
coil and the tuning screw & cavity).

Often the filters are stacked together, with coupling via "windows" in
the sides of the cavities.  A signal can be put into the first stacked
coil via a hardwired tap; likewise the signal can be tapped off of the
last stacked coil.

It is a high-Q device, with lots of rejection out of its passband.  Not
as high as a "cavity filter," but much smaller and much less expensive.
You will see a lot of them used as preselectors in receiver front-ends.
If the tx/rx split is wide enough, they can also be used as filters in
relatively inexpensive duplexers.
--

7777777  3333333      ****************************************
    77       33       **   Paul Anderson, AB4VA             **
   77       33        **   [e-mail]              **
  77         33       **   AB4VA @ KT4DI.#MLBFL.FL.USA.NA   **
 77      33  33       ****************************************
77         33


From [e-mail] Sat Jul 27 19:19:24 1996
Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.sprintlink.net!new-news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Bob Merritt)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Digital Microwave Radio
Date: Sat, 20 Jul 1996 13:40:15 GMT
Organization: MindSpring Enterprises
Lines: 34
Message-ID: <4sqnp2$[e-mail]>
References: <4smur8$[e-mail]> <4snmlr$[e-mail]> <4sp4tr$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: user-168-121-22-109.dialup.mindspring.com
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Xref: news2.epix.net rec.radio.amateur.homebrew:16214 rec.radio.amateur.digital.misc:16555

[e-mail] (Nick Kralevich) wrote:

>>Oh the
>>guys over in Utah have put together a T1 system, do a search to find
>>more info on it...

>Do you have a hint for what to search for?

hmmm...  good question, I haven't looked as yet myself.  I do know
that they've designed their own T1 modem for some surplus microwave
radio they had....

>I was hoping to avoid "off the shelf" solutions due to their high cost.
>Besides, it would be interesting to experiment with building equipment
>like this.

Wavelans cards are not that expensive and may do just the trick for
you.  TAPR just placed a group order for the cards with somebody and
they had the price down to ~$200 per card...

>Oh, one more question.  Do you have any idea how much this type of
>project would cost?
welll a PC on each end (if you dont have them already)  ~$2000 or
less...  2 wavelan cards  for $400    A good pair of yagi's for 900
Mhz... $300  unless you make them yourself!   and good quality
hardline and some bnc adapters....?

So figure ~$3000 total...    $1500 per node is about right

Bob
----
Bob Merritt  KA4BYP
http://www.mindspring.com/~bobm



From [e-mail] Sat Jul 27 19:19:26 1996
Path: news2.epix.net!uunet!in3.uu.net!EU.net!chsun!news.eunet.ch!ascomax.hasler.ascom.ch!usenet
From: Robert Ganter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: buidling a transmiter
Date: Thu, 25 Jul 1996 08:45:02 +0200
Organization: Ascom Business Systems AG
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pcts72.ens.ascom.ch
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win16; I)

<[e-mail]> (Shawn Kubik) wrote:
-----------------^^^^^^
>
> I am looking for plans to build a FM Transmiter.  I realy what plans
> for a transmiter no mater how big or small
>
> thanksOxford? How about correct spelling?
Ok, don't want to be a flamer now...

I have seen several posts from You recently, and in none of them it was
clear, what You exactly wanted (or it was written so generally, that it
was impossible to answer). Try to use the following hints:
- before posting: Think *clearly* about, what You want to know, then post
Your question.
- Using a spelling checker (or have a look in a dictionary, if You don't
know, how to write a word) is not a shame. IMHO the spelling and
grammatical errors You see in posts (from people with English as their
native language) is unbelievable. If this is our future...
For me, English is a foreign language I had to learn pretty hard to get
used to it. But I try to use it thoroughly.

Try to get some books about Amateur Radio. They are full of plans for any
kind of Radio stuff. The ARRL (American Radio Relay League) ist a first
class address for such books (http://www.arrl.org).
To use a transmitter (except assembled low power transmitters on some
frequencies) You need a license (e.g. Amateur Radio). Transmitting on
frequencies not covered by this licence is illegal and may be damned
expensive, if You are caught.

Ok, take a breath, think about, what You want and then ask again.

Regards

Robert


From [e-mail] Sat Jul 27 19:19:27 1996
Path: news2.epix.net!uunet!in2.uu.net!news.deltanet.com!news.deltanet.com!jlundgre
From: [e-mail] (John Lundgren)
Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew
Subject: Re: 100 Mhz band converter
Followup-To: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew
Date: 26 Jul 1996 12:16:41 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 35
Message-ID: <4tacv9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: nfs3.delta.net
X-Newsreader: TIN [version 1.2 PL2]
Xref: news2.epix.net sci.electronics.misc:8147 sci.electronics.design:10288 rec.video.satellite.tvro:30712 rec.radio.amateur.homebrew:16265

Steve Work ([e-mail]) wrote:
: I am trying to build or obtain a device which can translate signals from
: from the 0-4Mhz band up by 100Mhz (which is in the FM broadcast band,
: 100-104Mhz).  This will be used in conjuction with an FM broadcast
: receiver to demodulate FM signals which are in the 0-4Mhz range.  I've
: heard that such devices exist, but am unable to locate one.  Does anyone
: know who sells something like this or plans on how to make one?


First off, the 0 to 4 MHz band is AM, so if you upoconvert these signals
to the 100 to 104 MHz range, you will need an AM receiver to listen to
them.   All the receivers that I've seen in that band are FM, so you may
have an insurmountable problem.

: Or could you perhaps "hack" a device which modulates video for RF on
: channel 3 or 4 (60-70Mhz).  Does anyone know any details on how this could
: be done?

You can make a RF front end that preamps the 0 to 4 MHz and then mises it
with a 100 MHz oscillator.  But the 0 end of the band will be too close
to the osc and the receiver will be desensed if it gets too close to the
100 MHz osc output.

--
#===================================================================#
|    John Lundgren - Elec Tech - Info Tech Svcs. |    jlundgre@     |
|    Rancho Santiago Community College District  |   deltanet.com   |
|     17th St at Bristol \ Santa Ana, CA 92706   | http://www.rancho|
| My opinions are my own, and not my employer's. |    .cc.ca.us     |
|   Most FAQs are available through Thomas Fine's WWW FAQ archive:  |
|http://www.cis.ohio-state.edu:80/hypertext/faq/usenet/FAQ-List.html|
|     "Babe Ruth struck out 1,330 times...  keep on swinging."      |
|     says the lid on the jar of Laredo & Lefty's Picante Salsa     |
#======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#



From [e-mail] Sat Jul 27 19:19:28 1996
Path: news2.epix.net!uunet!in3.uu.net!news1.erols.com!news
From: Steve Ickes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM Modulation with SS Amps.
Date: Thu, 25 Jul 1996 17:27:42 -0700
Organization: A poorly-installed InterNetNews site
Lines: 37
Message-ID: <[e-mail]>
References: <4t5fch$[e-mail]> <4t6m7t$[e-mail]>
NNTP-Posting-Host: col-as5s01.erols.com
Mime-Version: 1.0
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X-Mailer: Mozilla 2.0 (Win16; U)

W8JI Tom wrote:
>
> In article <4t5fch$[e-mail]>, [e-mail] (Jeff
> Duntemann) writes:
>
> >Excellent!  I hadn't thought of this.  I have a reasonably husky 2.5V
> >filament transformer on the shelf (those were for 866A rectifiers,
> >right?) which would give a 48:1 ratio, and if fed with a 4 ohm audio
> >power source (which most of the solid state amps deliver) would match
> >about 9K ohms in the plate circuit, which is doable with most of the
> >tubes I'd be willing to fool with.  I guess the unanswered question is
> >whether a 2.5V filament transformer would clip the audio frequencies
> >even further; I'm not sure what the governing physics is in this case.
> >I would guess the audio response would be better but I'm not sure.
> >Any thoughts there?
>
> Audio response is limited by core eddy currents causing a loss of
> permeability as frequency is raised, and by the winding method. Good audio
> transformers have the windings interleaved, so flux losses are reduced and
> coupling is improved.
>
> Remember the power amplifier MUST be class C to be properly modulated, and
> if it's a tetrode the screen must also be tickled with a little audio. If
> it's a triode, the preceeding stage also may need to be modulated.
>
> 73 TomThe high freqy response of the transformer is determined by the
interwinding capacitance.  The leakage inductance also plays a big
factor.  Several years back, Glass Audio magazine had a great reprint
article on transformer design amd construction.  Check it out if you can
get a copy.

The screen can easily be modulated by deriving the screen voltage thu an
appropriate sized dropping resistor off the high side of the mod
transformer secondary to the screen.

Steve
WB3HUZ


From [e-mail] Sat Jul 27 19:19:30 1996
Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!globe.indirect.com!usenet
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM Modulation with SS Amps.
Date: Wed, 24 Jul 1996 14:25:11 GMT
Organization: The Coriolis Group, Inc.
Lines: 41
Message-ID: <4t5fch$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 165.247.88.202
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Doug Thomson) wrote:

> I have done this using a filament power transformer run backwards. A
>5.0 V secondary filament X-former with a 120 V pri, has a turns ratio
>of approx. 24 to 1. Now runing it backswards and feeding the output
>of a solid state amp @ 8 ohms gives an output impedance of 4.6 K
>(the square of the turns ratio times the pri impedance). A 6146
>running at 750 v and 150 ma needs a 5K laod, pretty close. If the
>filament X-former is rated at 4A secondary, the pri current is 166
>ma. Using a power x-former allows for load current to follow without
>saturating the core. The frequency response is not very good, the
>power x- former was designed to run at 60Hz, but I found that most x-
>former gave 2+ Khz top end, plenty good for AM, as a mater of fact
>the bandwidth need to be limited from the SS bandwidth of greater than
>20 Khz.
> Hope this helps. 73s
>
>  Douglas K. Thomson, KB4OQO
>  E-mail: [e-mail]
>

Excellent!  I hadn't thought of this.  I have a reasonably husky 2.5V
filament transformer on the shelf (those were for 866A rectifiers,
right?) which would give a 48:1 ratio, and if fed with a 4 ohm audio
power source (which most of the solid state amps deliver) would match
about 9K ohms in the plate circuit, which is doable with most of the
tubes I'd be willing to fool with.  I guess the unanswered question is
whether a 2.5V filament transformer would clip the audio frequencies
even further; I'm not sure what the governing physics is in this case.
I would guess the audio response would be better but I'm not sure.
Any thoughts there?

Thanks for your response.  I KNEW there'd be a use for that old 2.5V
transformer one of these days...

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona




From [e-mail] Sat Jul 27 19:19:31 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!news.mathworks.com!newsfeed.internetmci.com!news.sgi.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew
Subject: Re: 100 Mhz band converter
Date: 25 Jul 1996 16:24:01 -0700
Organization: BEST Internet Communications
Lines: 42
Message-ID: <4t8vmh$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: shellx.best.com
Xref: news2.epix.net sci.electronics.misc:8120 sci.electronics.design:10246 rec.video.satellite.tvro:30668 rec.radio.amateur.homebrew:16255

In article <[e-mail]>,
Rod Hewitt <[e-mail]> wrote:
>[e-mail] (Steve Work) wrote:
>
>>I am trying to build or obtain a device which can translate signals from
>>from the 0-4Mhz band up by 100Mhz (which is in the FM broadcast band,
>>100-104Mhz).  This will be used in conjuction with an FM broadcast
>>receiver to demodulate FM signals which are in the 0-4Mhz range.  I've
>>heard that such devices exist, but am unable to locate one.  Does anyone
>>know who sells something like this or plans on how to make one?
>>
>>Or could you perhaps "hack" a device which modulates video for RF on
>>channel 3 or 4 (60-70Mhz).  Does anyone know any details on how this could
>>be done?
>
>I tried hooking up an RF modulator to the baseband video output and
>then tuned it with a TV-Band radio. Didn't have much luck with any FM2
>stuff because the bandwidth of the radio was too great, but it did
>work - I could tune the audio subcarriers quite easily.
>
>Regards,
>Rod
>

This technique does work.  I just used a bench signal generator,
and later I used an old International Crystal oscillator module
to drive the LO port of a Mini-Circuits SBL series mixer.  The
signals from the satellite receiver are a bit high, so some attenuation
may be needed.  I did not need any RF or IF amplifiers or filters
around the mixer.

The Bandwidth problem can be solved if you put narrower filters
in the IF of the FM receiver.  These filters can be had from the
Toko section if the Digi-Key catalog if I remember correctly.
You can either make a narrow dedicated receiver or, as I did,
you can make sockets for the filters using 3 pins from a machined
IC socket.

Have Fun

Steve Muther WF6R



From [e-mail] Sat Jul 27 19:19:32 1996
Path: news2.epix.net!uunet!in3.uu.net!noos.hooked.net!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Prototyping boards for SMD?
Date: 23 Jul 1996 11:04:23 -0700
Organization: BEST Internet Communications
Lines: 52
Message-ID: <4t3477$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <[e-mail]>,
Ian White, G3SEK <[e-mail]> wrote:
>
>Many potentially useful new ICs are only available in SMD "SO" outlines
>based on a 0.05-inch pin pitch. How do you work with these ICs on
>ordinary 0.1-inch prototyping boards?
>
>Has anybody seen such things as SMD to standard DIL adaptors for 8-pin
>and 16-pin SMD ICs?  I'm thinking of something like a small PCB with
>tracks for 0.05-inch DIL SMDs, that would fan out to the standard
>0.1-inch DIL pitch. Such adaptor boards could be either dropped onto a
>standard DIL header or wire-linked through to 0.1-inch tracks.
>
>I suppose the other alternative would be to glue the SMD straight onto a
>0.1-inch DIL header and wire it up by hand.
>
>Are there any 0.1-inch prototyping stripboards like Veroboard/
>Vectorboard but with some provisions for 0.05-inch SMDs?
>
>And what about "SSO" devices using 0.025-inch pin spacing?
>
>
>73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
>                          'In Practice' columnist for RadCom (RSGB)
>Professionally:
>IFW Technical Services     Clear technical English - world-wide.

There are, here in the USA, several different brands of small prototyping
boards which hold one or more standard SO devices and fan the leads out
for conventional wiring techniques. The brand name Serfboards comes to
mind.  I think Digi-Key might sell them by mail. Seach for their WEB page.

I have had some success using deadbug techniques with SMT devices on
solid copper PCB scrap.  I have even done microwave circuits using
zero lead length techniques with SMT devices on solid copper at
frequencies up to 6GHz.

It can be done, some of the tools to find for your shop which are
helpful are fine point soldering iron, stereo microscope and an
assortment of tweezers.

There are also the many different techniques of doing homebrew PCBs.

I'd be interested in others experiences as well.

The techniques of homebrew are definatly changing. As a microwave
enthusiast, I wonder when someone will figure out practical ways
to do die attach and microbonding at home!

Steve Muther
WF6R



From [e-mail] Thu Aug 01 21:22:34 1996
Path: news2.epix.net!uunet!in3.uu.net!news.compuserve.com!ix.netcom.com!news
From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TV Frequinces
Date: 26 Jul 1996 13:37:38 GMT
Organization: Netcom
Lines: 28
Message-ID: <4tahn2$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: hou-tx2-19.ix.netcom.com
X-NETCOM-Date: Fri Jul 26  8:37:38 AM CDT 1996

In <[e-mail]> Don Huff <[e-mail]> writes:
>
>A Guy named Moe wrote:
>>
>> How can I find out the frequences that TV stations are using?
>
>Moe,
>
>   It would help if you would use a dictionary or spell checker
>on your posts.  (RE: ANTANNA for antenna, FREQUINCES for frequencies,
>etc!).
>
>  Look in any ARRL Handbook for all the information you bave
requested.                                               ^^^^
>  In there you will learn that each TV station has a picture carrier
>which is amplitude modulated (AM).  In addition there is a sound
>carrier, which is frequency modulated (FM).  Each channel occupies 6
MHz
>of assigned channel bandwidth.
>
>        GL and 73,
>
>               Don, W6JL
And what spell checker do you use, that includes the word bave?

People who live in glass houses should not throw stones.

Glenn Sparks


From [e-mail] Thu Aug 01 21:22:35 1996
Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!netnews.worldnet.att.net!newsadm
From: "Steve Kittelsen" <[e-mail]>
Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew
Subject: Re: 100 Mhz band converter
Date: 27 Jul 1996 22:45:37 GMT
Organization: AT&T WorldNet Services
Lines: 12
Message-ID: <01bb7c0d$50a48940$df0b74cf@stevekit>
References: <[e-mail]> <[e-mail]> <4t8vmh$[e-mail]> <31f88580.1365215@139.187.128.43>
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> Look into the Phillips NE602 LO/Mixer chip. Very simple and works
> well.

You can find a working schematics of the circuit at
http://home.eznet.net/redline/steve/

SK
*    [e-mail]
*    [e-mail]
*             O P E N  Y O U R  M I N D ...
G**********A********************Y***************PRIDE********!



From [e-mail] Thu Aug 01 21:22:36 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.fibr.net!nntp.primenet.com!uunet!in3.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (KJ4UO)
Newsgroups: rec.radio.amateur.homebrew
Subject: Amp Parts FS:
Date: 27 Jul 1996 23:55:13 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <4teob1$[e-mail]>
Reply-To: [e-mail] (KJ4UO)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi,

I have the following items up for Best Offer:

1:   Two sockets for the 4CX250's or 4CX150's
     These were removed from a FM broacast Transmitter
     which were manufactured by Gates/Harris. This
     Xmitter was removed from service about six months
     ago.

2:   Two 4CX150's which were used in the above.  The
     Xmitter was ran at 200 watts and the tubes were
     replaced ever 3 months.

 If interested, sent e-mail to [e-mail]

 Thanks!


From [e-mail] Thu Aug 01 21:22:37 1996
Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newsreader.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!newsfeed.concentric.net!news-master!news
From: [e-mail] (John Goller)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: 4cx1000a + socket
Date: 28 Jul 1996 06:25:19 GMT
Organization: Concentric Internet Services
Lines: 4
Message-ID: <4tf14f$[e-mail]>
NNTP-Posting-Host: crc8.cris.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

For Sale 4cx1000a tube and Eimac Y-149a socket Tube is tested and
works fine....full output!! 1.6 KW   make offer
de JOHN K9UWA



From [e-mail] Thu Aug 01 21:22:38 1996
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From: [e-mail] (PTracy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SPELLING PLEASE
Date: 28 Jul 1996 07:59:20 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <4tfkmo$[e-mail]>
References: <4t8quj$[e-mail]>
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In article <4t8quj$[e-mail]>,
[e-mail](Art) writes:

>For the life of me I can't understand why full fledged
>hams insist on spelling  "reciever" instead of "RECEIVER".
>

"I" before "E", except after "C", or when sounding like "A" in neighbor or
weigh.  That how I remember it.  Takes too many  brain cells I guess.

KE1C


From [e-mail] Thu Aug 01 21:22:38 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!math.ohio-state.edu!uwm.edu!news-res.gsl.net!news.gsl.net!ix.netcom.com!news
From: [e-mail] (charles cashion )
Newsgroups: rec.radio.amateur.homebrew
Subject: need SAMS Photofact CB-64
Date: 28 Jul 1996 15:32:07 GMT
Organization: Netcom
Lines: 14
Message-ID: <4tg15n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dal-tx1-57.ix.netcom.com
X-NETCOM-Date: Sun Jul 28 10:32:07 AM CDT 1996

I would like to convert a Midland 13-386 from SSB to 10 meters.
(With luck, it will be finished before the sunspots return)
The conversion would be easier if I could find a SAMS Photofact
volume CB-64. If you have one you would sell, please let me know.
If you have one and you would be willing to xerox those pages,
I would pay for that. If know somebody that sells them, and they
still have this volume, that would be helpful. As a last resort,
if you simply want to give me a copy, I would be grateful.
72s, 73s, whatever it takes,
Charles Cashion
W5ISZ
[e-mail]
work [e-mail]



From [e-mail] Thu Aug 01 21:22:39 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.inc.net!uwm.edu!news-res.gsl.net!news.gsl.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.flinet.com!news
From: duane <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: strange 10m converted CB SSB RF problem
Date: Mon, 29 Jul 1996 00:00:34 -0400
Organization: personal
Lines: 12
Message-ID: <[e-mail]>
References: <4tg356$[e-mail]> <4tha6f$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: wpb196.flinet.com
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To: Ken McCoy <[e-mail]>

Ken McCoy wrote:
>
> I should have defined the subject as a strange *question*. :) I'm brand
> new to SBB and got confused over the meter jumping around.
>
> Anyway, thanks to all for the courteous replies.
>
> Ken
> KF4BQF
the legal limit for ssb for the CB was 12 watts so that is most likely
to be the power out put for the 10 meter band after the conversion.
duane ab4be


From [e-mail] Thu Aug 01 21:22:40 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.inc.net!newspump.sol.net!spool.mu.edu!agate!howland.reston.ans.net!news-e2a.gnn.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (TUBEBUYER)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted:  Triodes,  WE Stuff
Date: 29 Jul 1996 01:05:52 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <4thgrg$[e-mail]>
Reply-To: [e-mail] (TUBEBUYER)
NNTP-Posting-Host: newsbf02.mail.aol.com

I looking for triodes to use in audio amplifier projects,  as well as
transformers, etc that I can use. .  I also collect almost anything
manufactured by Western Electric.  I have Ham gear and cash to trade.


Thanks and Best Regards,

Rick


From [e-mail] Thu Aug 01 21:22:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news.indy.net!ip38
From: [e-mail] (Occolowitz John)
Newsgroups: rec.radio.amateur.homebrew
Subject: Please identify Thordarson transformer.
Date: 29 Jul 1996 03:54:19 GMT
Organization: IndyNet - Indys Internet Gateway
Lines: 5
Message-ID: <4thclb$[e-mail]>
NNTP-Posting-Host: ip38.slip.indy.net
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I have a Thordarson transformer Type T-21P83. Appears to be plate transformer
about 1250V-CT-1250V secondary and primary with one tap. Does anybody have
specs. for this transformer?

                                                        Thanks. JohnO. KB9MIE.


From [e-mail] Thu Aug 01 21:22:42 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.voicenet.com!netaxs.com!op.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!tom-dunn.caltech.edu!user
From: [e-mail] (Tom Dunn)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Please identify Thordarson transformer.
Date: Mon, 29 Jul 1996 08:12:36 -0800
Organization: Caltech
Lines: 13
Message-ID: <[e-mail]>
References: <4thclb$[e-mail]>
NNTP-Posting-Host: tom-dunn.caltech.edu

In article <4thclb$[e-mail]>, [e-mail] (Occolowitz John) wrote
:

> I have a Thordarson transformer Type T-21P83. Appears to be plate transforme
r
> about 1250V-CT-1250V secondary and primary with one tap. Does anybody have
> specs. for this transformer?
>
>                                                         Thanks. JohnO. KB9MI
E

Thordarson catalog number 610 list the 21P83 as having a secondary voltage
of 1250-0-1250, or 1560-0-1560. The catalog states "Secondary voltage may
be changed by primary tap. Either of the given voltages are available."
The secondary current rating is 200ma. It is 115vac primary.  73 Tom
WB6IQD


From [e-mail] Thu Aug 01 21:22:43 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!tezcat.com!netaxs.com!hunter.premier.net!news-res.gsl.net!news.gsl.net!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!tube.news.pipex.net!pipex!weld.news.pipex.net!pipex!plug.news.pipex.net!pipex!hole.news.pipex.net!pipex!bt!usenet
From: Paul Beastall <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: High voltage transformers
Date: 29 Jul 1996 16:57:30 GMT
Organization: BT Labs
Lines: 14
Message-ID: <4tiqhq$[e-mail]>
References: <4t83tj$[e-mail]> <[e-mail]>
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I know I am replying to my own post but following a call to Peter Dahl &
Co I thought people may like to know that they have a web site now on

http://www.1eagle1.com/commercial/pwdco/

I hope that is sueful to some people

73

Paul Beastall, G1WBZ
Ipswich, UK.





From [e-mail] Thu Aug 01 21:22:43 1996
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From: kurang ajar <[e-mail]>
Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew
Subject: Re: 100 Mhz band converter
Date: Mon, 29 Jul 1996 18:41:06 +0800
Organization: VASB
Lines: 4
Message-ID: <[e-mail]>
References: <[e-mail]> <4tacv9$[e-mail]> <01bb7afa.0cd4b5a0$8e0446c7@stevekit> <[e-mail]>
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pls. email me the ckt diagram of the above converter


[e-mail]


From [e-mail] Thu Aug 01 21:22:44 1996
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From: [e-mail] (Just Me)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SPELLING PLEASE
Date: Tue, 30 Jul 1996 01:26:57 GMT
Organization: Netcom
Lines: 49
Message-ID: <[e-mail]>
References: <4t8quj$[e-mail]> <4tah5s$[e-mail]> <[e-mail]> <4thl78$[e-mail]>
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X-Newsreader: Forte Agent .99e/32.227

On 28 Jul 1996 23:20:24 -0700, [e-mail] (Lyndon
Nerenberg) wrote:

>[e-mail] (Dave Moorman) writes:
>>
>>> I'm with you, Art.  But may I point out that '73' means 'best regards'
>>> That make the above 'best regards's'
>
>>The apostrophe is being used as it is after the plural of an acronym, such
>>as TV's, CD's, etc., where it is appropriate.
>
>73 is not an acronym, it's a prosign (or macro). "73's" is by all
>accounts incorrect usage.
>
>In this age of no-code licensing, why does anyone even care?
>
>--lyndon
>
>
>--
>
>Engage your brain before your mouth ...

Having done the above,  those of us that may not agree with the CW
requirements do not, necessarily, want to trash all Amateur tradition.

In my opinoin, CW is the modern equivilant of spark transmission.  It
has no use other than pure enjoyment of those who like it.  This is
OK.  There is no longer ANY commercial or military usage of CW.  There
will sonn be too few amateurs left who can copy it for it to be of any
use in an emergency.  Why shove it down everyone's throat when only a
few actually enjoy it?  How many Gerneral, Advanced, or Extra Class
hams are there that can copy even 5 wpm any more?

Now that I have voiced my opinion, let me offer a solution.  Keep the
CW portions of the various bands for CW operators  ONLY.  Proficiency
in CW must be demonstrated for thier usage. (An endorsement to the
ticket perhaps?)  Maintain the testing levels for the various classes
of licences with stronger emphasis on theory, to replace the current
code requirements.  Add questions about operating courtesy (have you
heard our glorified CB'ers on 20 meters recently?).

This solution is not what everyone would like, but I think it is a
reasonable compromise.

Further discussion is welcome.

73,
Kevin  N0OAS/AAR8GF


From [e-mail] Thu Aug 01 21:22:45 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!arclight.uoregon.edu!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!agate!info.ucla.edu!zephyr!hansen
From: [e-mail] (Christopher J Hansen)
Subject: digital radio receiver
Sender: [e-mail] (News Daemon)
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I am interested in designing a digital radio receiver.  (Actually, an
analog front end and digital IF and demod.)  I'm looking for
suggestions for an A/D converter - I'd like a 1 MHz sampling rate with
12-14 bits, 16 if possible.  Thanks.

Chris Hansen, KQ6DW



From [e-mail] Thu Aug 01 21:22:46 1996
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From: [e-mail] (Zack Clobes)
Newsgroups: rec.radio.amateur.homebrew
Subject: ARRL Radio Designer
Date: 30 Jul 1996 04:55:32 GMT
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Hi, I'm looking at purchasing the ARD to help in designing a homebrew 20M rig
among other things.  Any comments as to how acurrate, how difficult to use, ho
w
useful this software is?   It'll be running under win 95 with 8 megs of ram an
d
a 486 dx2/66mhz machine.
Thanks



From [e-mail] Thu Aug 01 21:22:47 1996
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From: [e-mail] (Zack Clobes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help finding IC chip
Date: 30 Jul 1996 05:00:47 GMT
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Does anyone know where I can find  an HSP45102PC-40 IC made by Harris
Semiconductors.  They call it a "12-bit numerically controlled oscillator IC."

 It basicially produces a digital sine wave to drive a DAC for DSS.  Any help
would be appriciated.

Thanks.
73's de Zack, AA0XQ



From [e-mail] Thu Aug 01 21:22:50 1996
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From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM Modulation with SS Amps.
Date: 30 Jul 96 08:55:31 GMT
Organization: University of the Federal Armed Forces Munich
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[e-mail] (W8JI  Tom) writes:

>In article <4t5fch$[e-mail]>, [e-mail] (Jeff
>Duntemann) writes:

>>I'm not sure what the governing physics is in this case.
>>I would guess the audio response would be better but I'm not sure.
>>Any thoughts there?

>Audio response is limited by core eddy currents causing a loss of
>permeability as frequency is raised, and by the winding method. Good audio
>transformers have the windings interleaved, so flux losses are reduced and
>coupling is improved.

Is not the load of the class C PA an asymetrical load ? When the peak
voltage of the PA reaches the double of the Va, the power is the quadruple.
When the peak anode voltage go to zero, the power is zero too. Because
the modulator is usually a push-pull circuit, the one of the output
stage device will handle the high power half-wave, while the other device
will handle the low-power half-wave.

Which are the problems associated with this fact ? Can the load be
equilized between the two output devices (tubes or SS devices) ?
--
Claude
([e-mail])
The opinions expressed above represent those of the writer
and not necessarily those of her employer.


From [e-mail] Thu Aug 01 21:22:51 1996
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From: [e-mail] (Workshop)
Newsgroups: rec.radio.amateur.homebrew
Subject: rf design problem?
Date: 30 Jul 1996 11:06:26 GMT
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Hi there
Is there anyone who can help me figure out a problem concerning a design that
I have
seen in a book.You will need to have the book to help me.
The book is RF CIRCUIT DESIGN by CHRIS BOWICK.
On page 159 there is a diagram and design of a 15W 100MHz amplifier.
I understand the input and output matching that he has done,but where did he g
et
the 310 ohm resistor and the 1uH coil that are connected to the collector of t
he transistor
from.These are also in parallel with the output of the transistor and I would
assume affect
the matching network.These don't seem to have been taken into account.
Any help appreciated
Cheers
Robin
email : [e-mail]


From [e-mail] Thu Aug 01 21:22:52 1996
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From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2m wx radio conversion
Date: 30 Jul 1996 13:03:34 -0700
Organization: BEST Internet Communications
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References: <4tlog0$[e-mail]>
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In article <4tlog0$[e-mail]>,
Dave Harrison <[e-mail]> wrote:
>I have an older Radio Shack weather radio.  It's crystal controlled, and
>it looks like it uses a single 16.202MHz crystal which I think is
>multiplied 10, and has a single 455kHz if (i think).  Can I just replace
>the crystal to make a 2m rx?  I just want a single frequency receiver that
>I can do a dtmf decode on to launch high power rockets. (the safe distance
>for some of the rockets we fly at our experimental launches is 1/2 mile to
>1.5 miles, and yes do get FAA waivers, land owner permission, comply with
>ATF rules...).  Will I need to adjust coils/inductors?  Any suggestions on
>a crystal source?
>Please reply here or to [e-mail]

This kind of operation might be considered as RC model control which,
I believe, is only permitted on 6 meters with a 1W power restriction.

The RX mod you propose would probably work ok for 2M.  Those receivers
are not very selective to begin with.  You might not even have to
tune the front end.

Steve Muther WF6R




From [e-mail] Thu Aug 01 21:22:53 1996
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From: Michael Tracy <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL Radio Designer
Date: 30 Jul 1996 14:29:40 GMT
Organization: American Radio Relay League, Inc.
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>Zack Clobes wrote:
>
> Hi, I'm looking at purchasing the ARD to help in designing a
> homebrew 20M rig among other things.  Any comments as to how
> acurrate, how difficult to use, how useful this software is?

Hi, I am the ARRL's software support person for the ARRL Radio Designer.
If you (or anyone else) has specific questions about ARD's capabilities
or specifications, please contact me by email ([e-mail]) or by
telephone [phone]) for answers to your questions.

For general information on ARD, point your Web browser to:

http://www.arrl.org/ard/

Best Regards, Michael Tracy, KC1SX, ARRL Technical Information Services
-----------------------------------------------------------------------
American Radio Relay League, Inc.     Tel: [phone]
225 Main Street                       Fax: [phone]
Newington, CT 06111                   Email: [e-mail] (internet)
-----------------------------------------------------------------------




From [e-mail] Thu Aug 01 21:22:54 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: AM Modulation with SS Amps.
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4t5fch$[e-mail]> <4t6m7t$[e-mail]> <claude.838716931@bauv111>
Date: Tue, 30 Jul 1996 16:28:22 GMT
Lines: 52

In article <claude.838716931@bauv111> [e-mail] wr
ites:
>[e-mail] (W8JI  Tom) writes:
>
>>In article <4t5fch$[e-mail]>, [e-mail] (Jeff
>>Duntemann) writes:
>
>>>I'm not sure what the governing physics is in this case.
>>>I would guess the audio response would be better but I'm not sure.
>>>Any thoughts there?
>
>>Audio response is limited by core eddy currents causing a loss of
>>permeability as frequency is raised, and by the winding method. Good audio
>>transformers have the windings interleaved, so flux losses are reduced and
>>coupling is improved.
>
>Is not the load of the class C PA an asymetrical load ? When the peak
>voltage of the PA reaches the double of the Va, the power is the quadruple.
>When the peak anode voltage go to zero, the power is zero too. Because
>the modulator is usually a push-pull circuit, the one of the output
>stage device will handle the high power half-wave, while the other device
>will handle the low-power half-wave.
>
>Which are the problems associated with this fact ? Can the load be
>equilized between the two output devices (tubes or SS devices) ?

It takes just as much modulator power to pull the output down as
to push it up, so the loads on the modulator devices are equal.
What isn't equal is the current in the secondary winding of the
modulation transformer. On positive modulation peaks, it is high,
as the modulator voltage adds to the PA power supply voltage, on
negative modulation peaks it is low, as the PA power supply voltage
is bucked by the modulator voltage. This can affect core saturation
design values, but unless the modulation transformer is allowed to
saturate (and it never should be allowed to saturate), the loads on
the push pull modulator devices will remain balanced as they
alternately buck and boost the PA power supply voltage (and hence
modulate PA current).

The fact that the PA is Class C, and asymmetric, is irrelevant
because that's at RF frequency and not AF frequency. At AF,
many many RF cycles pass for each AF cycle, so the load averages
out on the timescale the modulator tubes see. The modulation
transformer can be considered a smoothing choke to RF, so those
pulses the Class C stage draws are smoothed to an average value
as far as the modulator devices are concerned.

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


From [e-mail] Thu Aug 01 21:22:55 1996
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From: [e-mail] (Jason Baack)
Newsgroups: rec.radio.amateur.homebrew
Subject: Mod of the TRC-208 11M to 10M Help?
Date: 30 Jul 1996 17:00:34 GMT
Organization: University of Maine System
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Hello all, I happen to stumble upon some of these OLD CB HT's for CB.
(Radio Shack TRC-208 /4 channels, hi/low power BIG telescoping antenna...)

Understanding that these units are transmitting in AM, how difficult would it
be to convert to 10M am.?

Any help would be great.

Jason   N1RWY

http://www.umecut.maine.edu/~baack  (ham radio meets Applachian Trial hiking)

[e-mail]



From [e-mail] Thu Aug 01 21:22:56 1996
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From: [e-mail] (Dave Harrison)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2m wx radio conversion
Date: 30 Jul 1996 19:40:48 GMT
Organization: Concentric Internet Services
Lines: 10
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I have an older Radio Shack weather radio.  It's crystal controlled, and
it looks like it uses a single 16.202MHz crystal which I think is
multiplied 10, and has a single 455kHz if (i think).  Can I just replace
the crystal to make a 2m rx?  I just want a single frequency receiver that
I can do a dtmf decode on to launch high power rockets. (the safe distance
for some of the rockets we fly at our experimental launches is 1/2 mile to
1.5 miles, and yes do get FAA waivers, land owner permission, comply with
ATF rules...).  Will I need to adjust coils/inductors?  Any suggestions on
a crystal source?
Please reply here or to [e-mail]


From [e-mail] Thu Aug 01 21:22:57 1996
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From: Aubrey Hawkins <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ?: 49MHZ MOD
Date: Tue, 30 Jul 1996 22:28:53 -0700
Organization: Why? Network   [phone]
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I have heard that there is a mod around that converts the 49 MHZ talkies
that radio shack puts to have them work on 6m.  Has anyone heard of
this.. I heard that you have to change some xtals.

Any help would be appreciated.


73s,

Aubrey Hawkins
KC5USI
Dallas


From [e-mail] Thu Aug 01 21:22:58 1996
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From: Frank Dinger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help SB-300 S meter/AGC
Date: Wed, 31 Jul 1996 00:06:41 +0100
Lines: 19
Message-ID: <[e-mail]>
References: <4t9h17$[e-mail]>
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In message <4t9h17$[e-mail]>
        [e-mail] (Roland) writes:

> Thanks for reading..... I have and SB-300 with a problem in the AGC
> circuit or S meter circuit.  With AGC off I get little or no reading
> in the S meter.  Switching in the AGC in either fast or slow restores
> the S meter but degrades signal quality.  Any ideas?  Radio works ok
>  otherwise, tubes test ok and voltages are in the ballpark.  Thanks.
> /John WB7SWB   E-mail    [e-mail]
>                               Packet  WB7SWB@W0RLI

John ,An S-meter circuit usually derives its signal from the AGC in
any superhet (but for professional rx) .This means that when you
switch off AGC your S-meter will no longer respond or hardly respond.

Frank Dinger , Inver by Tain , Ross-shire - Scotland UK
e-mail :  [e-mail]
Packet :  GM0CSZ @ GB7NOS.#76.GBR.EU



From [e-mail] Thu Aug 01 21:22:59 1996
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From: Cal Eustaquio <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need help with silkscreen/DATAK labels
Date: Wed, 31 Jul 1996 06:19:00 -0700
Organization: Cal Poly, San Luis Obispo
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-User: [e-mail]
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Does anyone know of a good method of duplicating old radio logos with
custom DATAK-type labels? I want to avoid silkscreening and heard there
exists a manufacturer or business who can take your design and turn it
into a DATAK (rub on lettering) type of medium. I appreciate all
suggestions and info on this querie. Cal.


From [e-mail] Thu Aug 01 21:23:00 1996
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From: [e-mail] (BOB ROACH)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SPELLING PLEASE
Message-ID: <[e-mail]>
Date: Wed, 31 Jul 96 11:42:00 -0500
Distribution: world
Organization: SelectiveSourceBBS VirginiaBeach  [phone]
Reply-To: [e-mail] (BOB ROACH)
References: <[e-mail]>
X-Newsreader: PCBoard Version 15.3
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Lines: 17

  >-OK.  There is no longer ANY commercial or military usage of CW.  There
  >-will sonn be too few amateurs left who can copy it for it to be of any
  >-use in an emergency.  Why shove it down everyone's throat when only a


They'll be around as long as they want HF privileges.

73 de KE4QOK
Bob

 * SLMR 2.1a * 666bps - communication rate of the beast


---
This message originated from:  ----------        Selective Source BBS
                                    -------    Virginia Beach, Virginia
                                         -----      [phone]


From [e-mail] Thu Aug 01 21:23:01 1996
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From: Sheldon Darack <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: "Y" adapter
Date: Wed, 31 Jul 1996 12:41:45 -0400
Organization: Lucent Technologies, Columbus, Ohio
Lines: 18
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References: <4tnm7o$[e-mail]>
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To: Scott Ryan <[e-mail]>
Xref: news2.epix.net rec.radio.amateur.homebrew:16300 rec.radio.amateur.equipment:31428

Sounds fine. You need two mono plugs (one for each radio) and one stereo
jack. Also two lengths of two conductor speaker wire. Connect the
grounds together at the stereo jack. Audio from one mono plug goes to
the stereo jack "tip". Audio from the other mono plug goes to the stereo
jack "ring".
Enjoy,
Shel  WA2UBK

Scott Ryan wrote:
>
> I'm looking to purchase or build a "Y" adapter that will allow me to
> connect the mono audio out (headphone, 1/8") from a scanner and a SW
> receiver to one stereo headset.
>
> My thought is to connect the SW receiver to the left channel of the
> headset and the scanner to the right channel, so as to listen to both
> audio's at once.  Will this create any negative effects (feedback, etc.)
> to the headset or the receivers?


From [e-mail] Thu Aug 01 21:23:04 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: 2m wx radio conversion
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4tlog0$[e-mail]>
Date: Wed, 31 Jul 1996 14:40:10 GMT
Lines: 26

In article <4tlog0$[e-mail]> [e-mail] (Dave Harrison) wr
ites:
>I have an older Radio Shack weather radio.  It's crystal controlled, and
>it looks like it uses a single 16.202MHz crystal which I think is
>multiplied 10, and has a single 455kHz if (i think).  Can I just replace
>the crystal to make a 2m rx?  I just want a single frequency receiver that
>I can do a dtmf decode on to launch high power rockets. (the safe distance
>for some of the rockets we fly at our experimental launches is 1/2 mile to
>1.5 miles, and yes do get FAA waivers, land owner permission, comply with
>ATF rules...).  Will I need to adjust coils/inductors?  Any suggestions on
>a crystal source?

Yes, you'll need to modify the front end inductorsi (add turns). They
won't come all the way down to 2m with just tweaking. (Alternately, you
can add padder capacitance to bring the radio down in frequency.)

The radio isn't very high performance, of course. Nor is it even slightly
secure. I'd want something a bit better to control pyrotechnics. At the
very least I'd require CTCSS on the link so that Joe HT won't inadvertently
fire the thing while you're hooking it up.

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


From [e-mail] Thu Aug 01 21:23:05 1996
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From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: "Y" adapter
Date: Wed, 31 Jul 96 16:51:07 GMT
Organization: Home
Lines: 21
Message-ID: <[e-mail]>
References: <4tnm7o$[e-mail]>
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In article <4tnm7o$[e-mail]> [e-mail] "Scott Ryan" writ
es:

> I'm looking to purchase or build a "Y" adapter that will allow me to
> connect the mono audio out (headphone, 1/8") from a scanner and a SW
> receiver to one stereo headset.
>
> My thought is to connect the SW receiver to the left channel of the
> headset and the scanner to the right channel, so as to listen to both
> audio's at once.  Will this create any negative effects (feedback, etc.)
> to the headset or the receivers?

Some military radio users do this sort of thing all the time, without
any problems. They also have a switch which enables them to transmit on
either of the nets they are monitoring.

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] Thu Aug 01 21:23:06 1996
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From: DD2KO <101503,2417@Compuserve>
Newsgroups: rec.radio.amateur.homebrew
Subject: HP3746A Manual
Date: 31 Jul 1996 17:19:59 GMT
Organization: analog.com
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Anyone able to help with Schematics or Manual of HP3746A Selective Level Meter
.
DD2KO Compuserve 101503,2417. Thanks and VY 73.



From [e-mail] Thu Aug 01 21:23:07 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment,sci.electronics.repair,sci.electronics.equipment,sci.electronics.design,sci.electronics.misc
Subject: Re: High and low Frequence Antannas
Date: Wed, 31 Jul 96 18:35:34 GMT
Organization: EZNEC Antenna Software
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In article
<[e-mail]>,
   "'Cel' M. Mallary" <[e-mail]> wrote:
>Reminds me of a Navy instructor who when asked the same question about a
>Yagi, raised his eyebrows and dryly said " pretty good."  'Course the same
>guy,
>a day or two before, enlightened us about the "1/4 wave ground plane" or
>the "Marconi whip" antenna.  Seems Marconi had been working through a
>summer draught trying to prove a base fed 1/4 wave rod with it's insulated
>base stuck in the ground, would produce a nice 360 deg. toroidal radiation
>pattern.  After a fruitless few days, Marconi threw up is hands and said
>"Aww piss on it".  Well one of his grunts did just that and all of a
>sudden the antenna started working.  And that's the honest to gosh
>beginning of all those little 1/4 wave whips you see on cars nowdays.
>                         ( (-:jm:-) )

So that's what a pissant is.

Roy Lewallen, W7EL


From [e-mail] Thu Aug 01 21:23:08 1996
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From: Christina Craft  <[e-mail]>
Newsgroups: in.ham-radio,ott.events,ott.general,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Any cool amateur radio online?
Date: 31 Jul 1996 21:04:52 GMT
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I've been looking endlessly for some cool amateur radio broadcasts
(preferably live stuff) on the net. I realize the technology is
still fairly expensive so it's hard for people to broadcast on
RealAudio or Streamworks but I'm interested in hearing some stuff
out there.

If you know of places where I can find this kind of live broadcast
I'd really appreciate being pointed to it.

I've done countless searches and must be putting in the wrong key
words.

Is anyone out there doing some amateur stuff or is it mostly the
mainstream doing online live broadcasts?

Your help is appreciated

email to [e-mail]

Cheers!


From [e-mail] Thu Aug 01 21:23:11 1996
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From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: "Y" adapter
Date: 31 Jul 1996 21:31:02 GMT
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In <[e-mail]> [e-mail] (Michael L. Ardai)
writes:
>
>In article <[e-mail]> Sheldon Darack
<[e-mail]> writes:
>-Sounds fine. You need two mono plugs (one for each radio) and one
stereo
>-jack. Also two lengths of two conductor speaker wire. Connect the
>-grounds together at the stereo jack. Audio from one mono plug goes to

>-the stereo jack "tip". Audio from the other mono plug goes to the
stereo
>-jack "ring".
>
>Just keep in mind that this will create a common ground connection
between
>the two radios.  Usually it's not a problem, but may be in certain
setups.
>/mike
>--
>\|/     Michael L. Ardai        N1IST       [e-mail]     \|/
>-*- === Boston Amateur Radio Club:  http://www.barc.org/barc === -*-
>/|\       or send "info barc-list" to [e-mail]        /|\
You may it also find it will drive you crazy, I tried a setup like this
for a while and couldn't handle it.

I always intended to build something that would sense the audio level
and break in when something was coming from the non-priority set.

Sparky  KI5GY