World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_01/_homebre.txt

Text File | 1997-02-01 | 882KB | 21,318 lines

The World of Ham Radio CD-ROM



From Unknown Fri Jan 05 12:35:23 1996
Path: news.epix.net!news.sprintlink.net!news1.cris.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need VTO's
Date: 1 Jan 1996 01:48:03 GMT
Organization: Concentric Internet Services
Lines: 13
Message-ID: <4c7egj$[e-mail]>
NNTP-Posting-Host: cnc086036.concentric.net
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Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.2 (Windows; U; 16bit)

Does anyone know where i can find some inexpensive voltage tuned osc's?
I have built several shortwave receiving converters to be used with the
car radio. these have used crystals to date but i want to substitute the
vto"s.   vto's need to have outputs around 4-6 mhz, 6-8 mhz, etc or
possibly a single one that would tune maybe 4-15 mhz or so. i am using a
simple conversion and mixing this so output is connected to the car
radios antenna and it is tuned to around 1000 khz.

the mixer is either a simple transistor or the ne-602.
thanks,
Tom Medlin, WA5KUB
email: [e-mail]



From Unknown Fri Jan 05 12:35:24 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!dns.humberc.on.ca!westonia!ppp-16
From: [e-mail] (Joseph Cooper)
Subject: Heathkit Active Antenna
X-Nntp-Posting-Host: ppp-16.ppp.westonia.com
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: Westonia
X-Newsreader: News Xpress Version 1.0 Beta #3
Date: Mon, 1 Jan 1996 01:58:23 GMT
Lines: 14

I am repairing a Heathkit Active Antenna model HGD-1424-A

I need the replacement part numbers for the MOSFET and Transistor

417-290 MOSFET

417-931 Transistor

Thanks in Advance

* Joseph Cooper:-VE3FMQ-QTH-East York-near Toronto Ontario Canada *
* Interests are:- BCB and VLF Radio-Woodworking-Steam Railroads - *
* -Nikola Tesla-Antique Radios-Crystal Radios-Travel-Burmese Cats *
* FAX [phone]:00pm to 5:00pm EDST Monday To Friday Only *


From Unknown Fri Jan 05 12:35:25 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!news.duke.edu!newshost.convex.com!news.onramp.net!usenet
From: wayne ashcraft <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Mods for the Yaesu FRG-7 receiver needed
Date: 1 Jan 1996 04:04:01 GMT
Organization: On-Ramp; Individual Internet Connections; Dallas/Ft Worth/Houston, TX USA
Lines: 6
Message-ID: <4c7mfi$[e-mail]>
References: <4c43sa$[e-mail]>
NNTP-Posting-Host: dal35.onramp.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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To: [e-mail]

You might want to try the radio mod section on my web page. I have three
links there that might help. Look under AMATEUR RADIO section,radio mods
at <http://rampages.onramp.net/~ashccw>.

wayne////N5UDE



From Unknown Fri Jan 05 12:35:26 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!lll-winken.llnl.gov!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.sas.ab.ca!fn1.freenet.edmonton.ab.ca!mwilde
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: NUTS AND BOLTS
Date: 1 Jan 1996 07:49:09 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 14
Message-ID: <4c83ll$[e-mail]>
NNTP-Posting-Host: fn1.freenet.edmonton.ab.ca
X-Newsreader: TIN [version 1.2 PL2.3]

I saw a posting that referenced a magazine or store (not sure what
exactly) with the name Nuts and Bolts.  The reference was with Electronic
Test Equipment.  If anyone knows who they are and where I can find out
more about them I would appreciate knowing.

Please reply to my email (unless you think everyone would bennefit)

73's
VE6MML

--
M WILDE                              email: [e-mail]
7708 181 STREET                      phone: [phone]
EDMONTON, AB, T5T 1Z7


From Unknown Fri Jan 05 12:35:27 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!jmatk.tiac.net!user
From: [e-mail] (James M. Atkinson, Communications Engineer)
Newsgroups: alt.law-enforcement,rec.radio.scanner,rec.radio.shortwave,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: TSCM Counter Surveillance, Privacy,  & Security Page
Date: Mon, 01 Jan 1996 08:43:00 -0500
Organization: tscm.com
Lines: 10
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: jmatk.tiac.net
Keywords: Security Counterintelligence Debugging Surviellance Wiretap
X-Newsreader: Yet Another NewsWatcher 2.1.3
Xref: news.epix.net alt.law-enforcement:40324 rec.radio.scanner:42966 rec.radio.shortwave:68249 rec.radio.amateur.digital.misc:13425 rec.radio.amateur.homebrew:12483

Happy New Year!!!!!

TSCM, Counter Surveillance and Debugging Page new materials... Check it out...

http://www.tscm.com/

Large section on TSCM test equipment
Large section on TSCM training and career paths

- James M. Atkinson     "...shaken, not stirred"


From Unknown Fri Jan 05 12:35:27 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!aegis.nitco.com!moe16
From: [e-mail] (James R. Smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Scheduler With Output Function
Date: Mon, 01 Jan 96 10:19:43 GMT
Organization: Northwest Indiana Telephone Company
Lines: 9
Message-ID: <4c7r6h$[e-mail]>
NNTP-Posting-Host: moe16.nitco.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I would like to know if the Creative Labs Soundblaster card, along with
Scheduler, can be equipped with an output function.  You know, to turn
something on and off with.

If not, do you know where I can obtain such a card and software?

Thanks

Jim


From Unknown Fri Jan 05 12:35:29 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: silver plating, help
Date: Mon, 01 Jan 1996 10:55:39 +0000
Organization: IFWtech
Lines: 79
Message-ID: <[e-mail]>
References: <4c6na7$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Newsreader: Newswin Alpha 0.9.1
X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!ifwtech.demon.co.uk

In article: <4c6na7$[e-mail]>  [e-mail] (Allen Finne) writes:

: I dimly remember reading an article once describing the use of exhausted
: black and white photographic fixer as the electrolyte for silver plating.
: I do a bit of photograhy and have old fixer available. The fact I can't
: find the article only made me determined to figure out what the method
: outlined was. I have played around a bit and found that I can sucessfully
: deposit a nice even coat of silver on a piece of brass. My problem is
: mixed results getting the silver to adhere well. I have managed to get
: what I'd consider proper plating on an object, but later using the same
: parameters the silver film can be rubbed off. I have played with varying
: voltages, currents, and methods of cleaning the brass prior to plating.
: Here are the parameters I'm using:
: 1) Voltage source is a 1.5v dry cell.
: 2) Series resistance of 12k in circuit giving a current flow of 1
:    milliamp or so.
: 3) Fixer saturated by loading it up with old photographic paper prior to
:    plating.
: 4) Silver donor is an old piece of solid silver silverware.
: 5) Cleaning the brass with a scotch-brite pad then wiping down with
:    alcohol to de-grease.

The article was "Safe, Sensible Silverplating" by J S Gurske, K9EYY in
'Ham Radio', February 1985. It works very well for copper and brass.

The main feature of K9EYY's method is that it doesn't use a conventional
bath of electrolyte. The plating is applied using electrolyte soaked into a
sponge which is tied onto the end of a carbon rod. The rod is connected to
the positive supply and the metal to be plated is connected to the
negative. The plating is then "rubbed on" using the sponge. If the
work-piece is really clean, the silver goes on easily to any desired
thickness until the electrolyte is depleted. Then you re-soak the sponge
with fresh electrolyte and carry on.

The most important electrical parameter is the current. K9EYY used 50mA
from a 6V battery in series with a 10k pot. He specifically warns against
using lower currents because the plating does not adhere reliably. For the
same reason, do not allow the sponge to touch the work-piece without the
power supply connected.

The rubbing action helps to consolidate the coating. The harder you rub,
the better the plating seems to be.

Obviously you need a drip tray to catch the electrolyte as it runs off the
work-piece, but there is no need for an assortment of plating baths of
special shapes and sizes. This is a huge advantage if your main hobby is
amateur radio, not amateur electroplating!

You can also save silver by plating the inside of coaxial cavities etc but
not the outside. To plate the inside of a long tube, connect the carbon rod
to an insulated wire, and tape the rod onto a stick. It is important to
waterproof any bare copper connections, to avoid creating unwanted
electrolytic cells.

K9EYY also describes how to regenerate the used electrolyte by dipping the
carbon rod into the container and using some silver item as the anode
(connections reversed, current 75mA).

If anybody in Continental Europe is reading this, the same electroplating
technique works even better using the "Anreibe-Silber" mixture which you
can buy at hamfests in Germany. This proprietary mixture is a tamer version
of the cyanide solutions that the professionals use, so although the
quality of plating is excellent I would not recommend it for anybody who is
not trained in chemical laboratory techniques.

Unfortunately neither of these processes will plate over tin-lead solder
without an electrolytic pre-treatment using cyanide solutions. You have to
either use hard solder or plate the individual parts before assembly.

Hope this helps, Allen - happy plating!


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



From Unknown Fri Jan 05 12:35:30 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Lrware)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NUTS AND BOLTS
Date: 1 Jan 1996 11:31:15 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <4c928j$[e-mail]>
References: <4c83ll$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi:
It's called "Nuts & Volts"
Subscriptions at: 1-800-783-4624
BTW: I like it a lot, good deals on suplus, and some good tech.
articles..
-larry


From Unknown Fri Jan 05 12:35:31 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!prodigy.com!usenet
From: [e-mail] (Ernest Hansen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NUTS AND BOLTS
Date: 1 Jan 1996 14:49:08 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 12
Distribution: world
Message-ID: <4c8s94$[e-mail]>
References: <4c83ll$[e-mail]>
NNTP-Posting-Host: inugap4.news.prodigy.com
X-Newsreader: Version 1.2

First, I have no connection with the magazine other than to enjoy reading
it once in a while. It is published monthly by T & L Publications, Inc.
430 Princeland Court, Corona, Ca 91719   Pnone 909-371-8497  Fax 909-371-
3052
Internet Address [e-mail]
Subscription line 1-800-783-4624

Hope this helps you. They send me a free copy about once a year.  I enjoy
receiving it to the point that I am concidering subscribing.

Ernie Hansen, K3VVV, [e-mail]



From Unknown Fri Jan 05 12:35:33 1996
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!caen!news.umass.edu!news.hampshire.edu!hamp!aswNS
From: [e-mail] (4)
Subject: Re: Atlas 210X power output Question
Message-ID: <117cc$[e-mail]>
Date: Mon, 01 Jan 1996 14:53:01 GMT
FollowUp: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
References: <4bsigj$[e-mail]>
Organization: Hampshire College, Amherst MA
X-Newsreader: TIN [version 1.2 PL2]
Lines: 72
Xref: news.epix.net rec.radio.amateur.equipment:23294 rec.radio.amateur.homebrew:12486

On 27 Dec 1995 22:48:51 GMT Michael G. Reiney ([e-mail])
wrote in rec.radio.amateur.homebrew:

: I have an Atlas 210X that works fine on 40 meters and up.  On 75
meters, I can only
: get about 40W out of it.
: I hypothesize that if the high freq power out is ok, the transistors
are  good.
: The 80M filters are not tunable, so they've probably not been tweeked.

I obtained a 210X a couple of years ago, before a year-long trip to
Nicaragua (where I operated as YN1ASW). I thought an older simpler rig
might be more reliable and maintainable in a situation where I would
have little test equipment and parts accessibility would be
difficult. I checked the rig out at home with a regulated power
supply, but when I got to Nicaragua I had a number of unexpected
problems. First, my power source was a 12V battery charged by a solar
panel, and I found the Atlas really needed the extra voltage available
when the battery was under charge, the output power would fall off a
lot when the voltage fell from 13.6 down to 12V.

More seriously, I found that there were serious instability problems
if the rig looked into a reactive load. It would work fine directly
into a dummy load, but through a tuner into the load or into a real
antenna, whether through the tuner or not, it would break into
parasitic oscillations as the drive was brought up to a critical
level. I don't know exactly what frequency the oscillations were, but
they tended to wipe out my housemates' VHF TV reception, and this put
major constraints on my operating schedule.

I was able to get some control over the situation by putting a high
resistive load (I think I used something like 1000 ohms, 2 watts -- I
had a limited stock of resistors) across the input of the tuner. The
idea was to have a high enough value that it would take a negligible
amount of power at frequencies where the load looked like 50 ohms, but
at other frequencies where presumably the antenna and/or the tuner
looked like some kind of high-Q circuit this might damp it enough to
suppress the parasitics. I was able to operate at reduced power levels
this way, but any attempt to go for full power would result in
parasitics again.

My operation was mostly on 20 meters, sometimes on 15 when it would
support my skeds back to the US. I never was able to get more than
about 50 watts out of the rig.

When I first obtained the rig I got a packet of info from Hi Manuals,
which included a lot of info on various mods in early production
versions of the Atlas, some of which I recall had to do with power
output or stability problems. As far as I could tell my own Atlas was
a late enough model to incorporate all the fixes, but it still gave me
a lot of problems. My conclusion is that it just pushed too hard at
the limits of the technology of its day, and that variations in the
semiconductors probably weren't adequately protected against.

I don't know if any of this is relevant to your problems, but maybe
there are some connections. I would definitely look for parasitics
that may be robbing power from the operating frequency.

If anyone reading this has any comments on the problems I experienced
I would appreciate hearing them. When I left Nicaragua in Dec. 94 I
put the rig in storage there, as I expect to return there for another
extended stint in the next year or two.  But it would be nice if I
could go back armed with some ideas about how to get the 210X to
behave a bit better.

73, Al N1AW
--
Al Woodhull
[e-mail]
n1aw@k1mea.#wma.ma.usa.na
[e-mail]




From Unknown Fri Jan 05 12:35:34 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!pop.gnn.com!JOHNWHITE
From: [e-mail] (William White)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2M T/R relay plans?
Date: Mon, 01 Jan 1996 18:10:21
Organization: Megaweb
Lines: 7
Message-ID: <4c9phd$[e-mail]>
NNTP-Posting-Host: @www-22-116.gnn.com
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
X-GNN-NewsServer-Posting-Date: 1 Jan 1996 23:08:29 GMT
X-Mailer: GNNmessenger 1.2

I am looking for construction details for a 2 Meter T/R relay.
Any help?

Thanks,

John KD4YRB



From Unknown Fri Jan 05 12:35:35 1996
Path: news.epix.net!news.sprintlink.net!news.rmci.net!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!news.ksu.ksu.edu!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger
From: [e-mail] (COUGER GORDON)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting 300baud data on 27/49Mhz
Date: 1 Jan 1996 22:36:21 GMT
Organization: CEAT at Oklahoma State University, Stillwater
Lines: 43
Message-ID: <4c9nl5$[e-mail]>
References: <4c49gn$[e-mail]>
Reply-To: Gordon Couger <[e-mail]>
NNTP-Posting-Host: master.ceat.okstate.edu

In article <4c49gn$[e-mail]>,
Warhurst <[e-mail]> wrote:
>Julian Warhurst
>[e-mail]
>
>I am in the process of designing a low baud rate data link for a remote
>instrumentation station.  I had considered using the 49Mhz RC/Cordless
>Telephone or the 27Mhz "Citizens Band" frequencies simply because of the
>availability and low cost of the hardware.  However the range of about 2
>miles proved inadequate for a 100mW 49Mhz transmitter, but a 3 watt 27Mhz
>hand held transceiver worked perfectly.
>Here are my questions:
>
>Are there any restrictions on transmitting data (300 baud FSK) on 27Mhz
>above the 100mW power threshold?
>
A couple of years ago I looked into this fairly extensively. 27 MHz
CB is a no - no as is commercial 50 150 and 450 MHZ bands. We ended up
using the 4?? MHz GMARS citizens band and I am not sure that this is
stirctly leagle.

If you are building a personal deveice I would look in to using directional
antennas you only need 5 db gain over the antenna you are using on 27 MHz
a 3 element Yagi-Uda on each end might do. This is not leagle for part 15
of the FCC rules as it is no longer defined as 100 mw but defined volts
per square meter and a derictional antenna will exced these levels.

If it is for personal use a ham licence is easy to get and 220 & 440
are leagle at any power level.

For a commercial device I don't know of a solution.

For and expermential device of any kind the FCC issues expermanetal
licences for one year at a time that are easy to renue. As I recall you
need to fill out a form and include a letter explaining what you are doing.

Good luck
Gordon AB%DG

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




From Unknown Fri Jan 05 12:35:37 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!ns1.iamerica.net!usenet
From: Darrell Barabash <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: 90 ohm cable on 300 ohm antenna
Date: Mon, 01 Jan 1996 23:25:57 -0600
Organization: iAmerica, Inc.
Lines: 20
Message-ID: <[e-mail]>
References: <4beib0$[e-mail]>
NNTP-Posting-Host: iad_ppp0221.iamerica.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)
To: Loren Coe <[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:12491 rec.radio.amateur.antenna:18183

Loren Coe wrote:
>
> what determines the impedance of an antenna?  is there anything i can do
> to mitigate the need for a matching xfmr.
>

Virtually every physical aspect of an antenna affects its impedance. Generally
,
though, a yagi type antenna is designed with a dipole as the driven element. Y
our
antenna is 300 ohms because the driven element is (probably) a "folded dipole"
. A
folded dipole looks like a rather narrow an elongated rectangle. One property
of a
folded dipole is that the "folding" is usually designed to cause a 4:1 impedan
ce
increase. Thus, a dipole which is typically about 73 ohms is transformed to ab
out
292 ohms (300 ohms effectively).

Replacing the driven element with a conventional dipole is one way of avoiding
 the
matching transformer. But, you should still use a 1:1 coaxial balun to convert
 from
unbalanced to balanced.

Darrell
Grapevine, TX


From Unknown Fri Jan 05 12:35:37 1996
Path: news.epix.net!news.sprintlink.net!news.interport.net!usenet
From: Michael Neidich <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FREE: Zenith Trans-O Model Nubmers vs. Features
Date: 2 Jan 1996 03:51:51 GMT
Organization: Interport Communications Corp.
Lines: 3
Message-ID: <4caa4n$[e-mail]>
NNTP-Posting-Host: neidich.port.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Request via email
73, K2ENN



From Unknown Fri Jan 05 12:35:39 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF Amplifiers
Date: Tue, 02 Jan 96 07:57:58 GMT
Lines: 24
Message-ID: <[e-mail]>
References: <4cc0i0$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

  Edouard Elizee <elizee> wrote:

>I am trying to assemble my own HF medium power amplifier.

You might want to contact R.F. Electronics.  They sell amplifier kits
with power ratings of 300, 600 and 1,200 watts.  You can buy them as
kits or assembled, or just buy certain parts.  For example, they list
the PC board with parts list and instructions for $25.00 (300W).  The
600W amplifier uses two boards ($45.00); the 1,200W uses four ($85.00).
They also sell the various size heat sinks, 5-pole Chebyshev filter kit
($40.00 - covers 160, 80, 40, 20, 15 & 10M), and other parts.

I haven't done business with this company myself, but you can reach
them at:

     R.F. Electronics
     Lee Martin  KD4YBC
     197 Chickasaw Lane
     Myrtle Beach, SC 29577
     [phone]  (10:00AM-9:00PM EST)

73,
Jack  WB3U


From Unknown Fri Jan 05 12:35:40 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!in-news.erinet.com!ragnarok.oar.net!malgudi.oar.net!watt.oedison.com!usenet
From: [e-mail] (John Wagner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ECP/EPP bidirectional PC parallel ports
Date: Tue, 02 Jan 1996 14:58:59 GMT
Organization: Ohio Edison Company, Akron OH
Lines: 26
Message-ID: <4cbgv1$[e-mail]>
References: <4bck80$[e-mail]> <4c71v4$[e-mail]>
NNTP-Posting-Host: go-bus-appl-4-8x.oedison.com
X-Newsreader: Forte Free Agent 1.0.82

>Johan Forrer ([e-mail]) wrote:
>: Hi all,

>: Does anyone perhaps know how to use/program the new ECP/EPP parallel
>: ports that one see nowadays on PC parallel interface cards?

>: I understand that they support the older nybble-based printer standard,
>: but in addition also support a full bidirectional interface, which of
>: course will make them that much more attractive for interfacing to
>: ham-radio projects.

>: Any information or pointers would be much appreciated.

>: --Johan Forrer, KC7WW

I just ran across the mother of all PC port interface pages:

http://www.paranoia.com/~filipg/HTML/LINK/PORTS/F_Parallel.html

There is info on Parallel, Serial, Joystick (analog), etc.

-------------------------------------------------------------------
John Wagner                  [e-mail]

For Encrypted Mail: PGP Public Key Available upon Request



From Unknown Fri Jan 05 12:35:41 1996
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From: [e-mail] (Chris Smolinski)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Mid-Atlantic Hamfests
Date: Tue, 02 Jan 1996 18:22:34 -0500
Organization: Smolinski Scientific Systems, Inc.
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: bab00110.slip.digex.net
X-Newsreader: Yet Another NewsWatcher 2.1.1
Xref: news.epix.net rec.radio.amateur.homebrew:12497 rec.radio.amateur.misc:96413 sci.electronics:164651

I used to keep a schedule online of upcoming hamfests in the Mid-Atlantic
(roughly Northern Virginia to New York) area. I'd like to do the same
thing this upcoming hamfest season.

I would appreciate it if anyone who knows of an upcoming hamfest would
email me with the details, and I'll add it to the list.

Even though hamfest season is still some time away, it's never too early
to start!

Thanks,

Chris N3JLY

--
----------------------------------------------------------------------------
|Check out my WWW page at http://www.access.digex.net/~cps/ for scientific   |

|software for the Mac, Free Radio, Shortwave Radio, and Spy Numbers Stations |
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 ----------------------------------------------------------------------------



From Unknown Fri Jan 05 12:35:42 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!minfox!tom.alldread
From: [e-mail] (Tom Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: CMOS SUPERKEYER II CURRENTS
Date: Tue,  2 Jan 1996 19:17:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
Lines: 51


Greetings:

        Further to earlier post on this subject I have recorded the
current drawn by my CMOS SUPERKEYER II in various modes.

         I connected a digital mA meter in series with my keyer
battery to measure the current drain and the following is the
test results (with the sidetone monitor speaker turned off):


KEYER MODE SENDING DASHES:      3.35 milli Amperes
KEYER MODE SENDING DITS:        3.22 milli Amperes
KEYER MODE IDLE-FIRST 3 SECS:   2.64 milli Amperes
KEYER MODE IDLE-AFTER 5 SECS:   0.9  micro Amperes
                                (IE: 0.0009 milli Amperes)
HAND KEY MODE - KEY DOWN        3.45 milli Amperes
HAND KEY MODE - KEY UP          2.53 milli Amperes continuous
FUNCTION MODE                   2.61 milli Amperes continuous
TRANSMIT TUNE                   3.19 milli Amperes continuous
? INTERROGATE MODE              2.72 milli Amperes continuous

        With the monitor speaker on in the ~hand key~ mode and key down
the current increased to 18.45 milli Amperes.

        As shown the only time my keyer will go into its power down
sequence is when it is in the regular ~keyer~ mode.

        Generally the CMOS SUPERKEYER II has served me very well and I
am pleased with it.  Now that I am aware of its power down
characteristics I will be careful to ensure that I leave it in the
~keyer mode~ when not in use to preserve the battery life.

         In the event that a new version of firmware is written
possibly a suitable watch dog timer could be incorporated to kick the
keyer out of the special modes after an appropriate delay. To
help preserve battery longevity for those that regularly use the keyer
in the ~hand key~ mode possibly a second power down sleep sequence could
also be provided for that mode of operation.

        It would be interesting to hear from others that make similar
power drain measurements on their CMOS SUPERKEYER II keyers to determine
if the characteristics were improved in later versions. Mine is probably
has the first firmware release as I built it shortly after the article
was published in November 1990 QST.


73 de VE7TMA

---
 * QMPro 1.53 * Very Best Regards, [e-mail]


From Unknown Fri Jan 05 12:35:43 1996
Path: news.epix.net!news.sprintlink.net!service-2.agate.net!usenet
From: John Wilcox/NS1Z <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 2 Jan 1996 23:56:36 GMT
Organization: Agate Internet Services (AIS)
Lines: 15
Message-ID: <4ccgnl$[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]>
NNTP-Posting-Host: ns1z.sdi.agate.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

I built the kit and was quite impressed with it. Works as advertised and
only glitch was inserted by myself. It is now installed in the Jimmy
under the IC-706 and working against a mobile 4 band Hustler style
antenna on the rear bumper. What's the big deal, haven't seen anyone
complain about Yaesu, Kenwood or Icom not giving their stuff away.....
--
John Wilcox / NS1Z
44.118.6.4
[e-mail]
204.117.6.48
[e-mail]

ns1z @ kb1bsc.fn44rn.me.usa.noam




From Unknown Fri Jan 05 12:35:44 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!unixg.ubc.ca!nntp.cs.ubc.ca!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!gulseth
From: [e-mail] (Marty Gulseth)
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV CAMERA CONNECTIONS
Date: 3 Jan 1996 00:16:13 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 18
Message-ID: <4cchsd$[e-mail]>
NNTP-Posting-Host: hpspkeb.spk.hp.com
X-Newsreader: TIN [version 1.2 PL2.2]

Hello All,

If I have posted this to the wrong newsgroup, please don't flame me - I
am new at this!

I have an older video camera left over from the family entertainment
center which another local ham wants to use for ATV work.  The camera is
(for reference) a Minolta K-520S, and is the kind with the cord which
connects to a separate VHS tape deck.  The connector is ten pins.

I understand that the above connector arrangement was "semi-standard" for
this sort of camera.  Does anyone have information on the pinout for this
camera, or know where I could find same?

Please reply to me at [e-mail].  Thanks to all!

73 DE W7LEJ - Marty Gulseth, Spokane, WA



From Unknown Fri Jan 05 12:35:45 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!nntp-hub2.barrnet.net!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need AA-size dummy cell/bridge
Date: 3 Jan 1996 00:34:47 GMT
Organization: Stanford Amateur Radio Club
Lines: 18
Message-ID: <4cciv7$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <[e-mail]> [e-mail] (David Feldman) writes:
>I'm looking for a source of dummy cells, AA size. These would be used when
>(for example) you want to use 6 alkaline (1.5V) cells in lieu of 7 nicad
>(1.2V) cells and need to bypass one of the cells in a way that's mechanically
>sound. Has anyone seen these for sale anywhere?
>
>73 Dave WB0GAZ [e-mail]


I just cut the head off an old steel bolt or cut a length of brass rod
stock whenever I wanted to do this.  Some heat shrink around the rod
keeps things insulated if needed.

Steve Muther WF6R

[e-mail]




From Unknown Fri Jan 05 12:35:46 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.isp.net!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet
From: [e-mail] (Ernest Hansen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Sending digital data on 27/49Mhz
Date: 3 Jan 1996 02:36:53 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 10
Distribution: world
Message-ID: <4ccq45$[e-mail]>
References: <4c4kkd$[e-mail]>
NNTP-Posting-Host: inugap4.news.prodigy.com
X-Newsreader: Version 1.2

If this device is being used in the Amateur Radio Service there is
frequencies in the 6 meter band reserved for radio control aircraft (if
that is what you are doing). Also check frequency listings for garage
door opener and etc freqencies (up about 300mhz)


-
  ERNIE [e-mail]  (K3VVV)




From Unknown Fri Jan 05 12:35:47 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news-feed.mci.newscorp.com!usenet
From: [e-mail] (Jason D. Triolo)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Re: Mid-Atlantic Hamfests
Date: Wed, 03 Jan 1996 05:21:41 GMT
Organization: News Corp./MCI Online Ventures
Lines: 39
Message-ID: <4cd3q4$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: slip163-188.bb.delphi.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.homebrew:12505 rec.radio.amateur.misc:96430 sci.electronics:164707

[e-mail] (Chris Smolinski) wrote:

>I used to keep a schedule online of upcoming hamfests in the Mid-Atlantic
>(roughly Northern Virginia to New York) area. I'd like to do the same
>thing this upcoming hamfest season.

>I would appreciate it if anyone who knows of an upcoming hamfest would
>email me with the details, and I'll add it to the list.

>Even though hamfest season is still some time away, it's never too early
>to start!

Well...about 90 miles south of Metro DC is the annual Frostfest in
Richmond.

Held at the Showplace...3000 Mechanicsville Tpk, Richmond, VA
Sunday, 1/21/96 from 8:30 to 3:30.

Take I-95 south to I-64 East (Exit 75) to US 360 East (Exit 192).
Showplace is 1/2 mile on the left.
Parking is free, admission is $5.00. No discounts for advance tickets.
Licensing exams are usually conducted the day before. Not sure what is
planned for this year.

Info is available through the voice mail service of the Richmond
Amateur Telecommunications Society at 804/739-2269. Enter box number
3378 (FEST) for general information and table reservations.

Major retailers are expected there (most notably HRO, but there are
many others), a number of manufacturers (not sure who has committed
yet), and ample flea market space. Computer vendors will also be
there.

Hope to see you there!

E-Mail me if you need more info.
73 de Jason, KD4ACG
[e-mail]



From Unknown Fri Jan 05 12:35:48 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!miwok!well!pacbell.com!ihnp4.ucsd.edu!swrinde!newsfeed.internetmci.com!in1.uu.net!news.iij.ad.jp!super.win.or.jp!usenet
From: [e-mail] (Akihiro Oguma)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for crystal controlled transmitter
Date: 3 Jan 1996 05:26:03 GMT
Organization: Your Organization
Lines: 21
Message-ID: <4cd41b$[e-mail]>
NNTP-Posting-Host: ppp3347.win.or.jp
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.3J

I would really like to find transmitter.
If possible,it is crytal controlled one and batteryis supplied with AC.


Because...


There are a few types,so we can easily find it bug.

Could you tell me the fax number or E-mail address of the shop ?
Thanks much!



Akihiro Oguma

[e-mail]






From Unknown Fri Jan 05 12:35:49 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF Amplifiers
Date: 3 Jan 1996 11:35:37 GMT
Organization: ENST - Telecom Paris
Lines: 11
Message-ID: <4cdpm9$[e-mail]>
References: <4cc0i0$[e-mail]> <[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

WB3U ([e-mail]) wrote:
:   Edouard Elizee <elizee> wrote:
: >I am trying to assemble my own HF medium power amplifier.
: You might want to contact R.F. Electronics.  They sell amplifier kits
: with power ratings of 300, 600 and 1,200 watts.  You can buy them as

HI. You call a 300 W amplifier "medium power" ?
It is already more than we are authorized here ! (in France : 250 W max.)

Just frightened :-)
Vince, F5RCS


From Unknown Fri Jan 05 12:35:50 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet
From: Jim Strohm <Jim Strohm@ausq1ak>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need AA-size dummy cell/bridge
Date: 3 Jan 1996 15:30:40 GMT
Organization: Semiconductor Products Sector
Lines: 4
Message-ID: <4ce7f0$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 222.229.249.169
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12(Macintosh; I; PPC)
X-URL: news:[e-mail]

Wrap a dead AA cell in tinfoil, and insulate with masking tape if
necessary.  Can't get much cheaper and simpler thna that.




From Unknown Fri Jan 05 12:35:51 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ns3.iamerica.net!ias_ppp0103.iamerica.net!user
From: [e-mail] (J. Travis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need headphone switching circuit
Date: Wed, 03 Jan 1996 15:33:25 -0600
Organization: Anesthesia Associates
Lines: 14
Message-ID: <jttravis-0301961533250001@ias_ppp0103.iamerica.net>
NNTP-Posting-Host: ias_ppp0103.iamerica.net

Hi, I need help designing a simple circuit.  I have two audio outs (A and
B).  A is stereo and primary, B is infrequently used.  I'd like a circuit
that would allow me to plug in one set of earphones and monitor A, but
when B comes on to switch to it then back when B is silent - it could be
to just one channel of the headphones to simplify.

 I'd like it to be self powered.

 Thanks in advance.
KC5DWU

--
J.T.Travis            | [e-mail]
'93 EX-500


From Unknown Fri Jan 05 12:35:52 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!news.agt.net!news
From: [e-mail] (Steve Mason)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Wed, 03 Jan 1996 17:21:47 GMT
Organization: AGT Ltd.
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <4ccgnl$[e-mail]>
NNTP-Posting-Host: clgrpt02-port-15.agt.net
X-Newsreader: Forte Agent .99c/16.141

On 2 Jan 1996 23:56:36 GMT, John Wilcox/NS1Z <[e-mail]> wrote:

:>I built the kit and was quite impressed with it. Works as advertised and
:>only glitch was inserted by myself. It is now installed in the Jimmy
:>under the IC-706 and working against a mobile 4 band Hustler style
>antenna on the rear bumper. What's the big deal, haven't seen anyone
>complain about Yaesu, Kenwood or Icom not giving their stuff away.....

I missed the start of this thread, which QST was this in?

Thanks,

Steve VE6STV


From Unknown Fri Jan 05 12:35:53 1996
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!HiWAAY.net!imci2!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Leland Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 3 Jan 96 17:25:55 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

unsub [e-mail]
Lee Anderson.



From Unknown Fri Jan 05 12:35:54 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!pmafire!net.ricks.edu!usenet
From: [e-mail] (James Griffith)
Subject: Re: QST Automatic Tuner Article
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet)
Organization: Ricks College
X-Newsreader: WinVN 0.93.11
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]>
Mime-Version: 1.0
Date: Wed, 3 Jan 1996 18:29:55 GMT
Lines: 88

In article <4c6es2$[e-mail]>, [e-mail] says...
>
>[e-mail] (James Griffith) wrote:
>
>>>QST is sold at most major news stands and magazine racks now. You
might
>>want to try that. The artical is not that big a deal. It's an
>>advertisment so its writer can make money. It would be difficult to
>>duplicate without buying their kit. QST is going same way Popular
>>Electroncs went years ago, selling kits with articles.
>
>Hello, Jim,
>
>I don't kwow if I would go *that* far.  First, ARRL doesn't sell the
>kits; the authors do.  From the feedback we have received from readers,
>most readers *prefer* construction articles that have kits.  And, in
most
>cases, even if a construction project has a kit, the builder can still
>dead-bug it, if he or she chooses.  This tuner article is almost an
>exception to the rule, in that it requires a part that is available only
>from the author.  However, the author will gladly sell the
>progrmammed IC only for those who want to locate all the other
>parts themselves. (I wonder if *anyone* will take him up on the
>offer; I want the kit! :-)  ).
>
>
>>
>
>I don't mean to sound like a "wet blanket", and I don't know your age,
mine is 52. But, I remember the exciting time when, with almost nothing
at all, one could get on the air with something he or she built. Or, if
you were intrested in just building an electronic project from Ppopular
Electronics, you were able, because at the age of 12 or 13 you didn't
have the money to by that one part that could only be bought from that
special place, who ever or were ever it might be.

Have you ever longed to build something electronic at the age of 12 or
so, and had no money, but the author gave you a way to do in in the
article, like the code for the chip, or the turns count and size of the
coil.

I believe,(This is only me talking.) and I am a member of ARRL and you
have published 2 very popular articles I wrote, at least my fan mail said
so, that QST is no longer a member publication devoted to ham radio, FOR
THE LOVE OF IT, but has gone into business, targeting those people who
would buy more magazines, (Your on the news stand now.) books, and other
offers the ARRL has, and has geared it QST publication toward them.

Who are those people, (Me talking again.) thay are people who never grew
up in ham radio scrounging a part or a who rig full of parts to get on
the air, and if the truth be known, computer have the interest of the
young people, not ham radio. I can talk any were in the world on internet
who needs a radio.

Those are the people targeted by QST. We all see the QRP articales, about
the only rig that can be built any more, if one can find a variable
capacitor. Have you even seen a dealer advertise a line of variable
capacitors in QST or any were elce. I have been in hard electronic repair
for 35 years, and I can fix hundreds of things not made anymore, or will
never be made again. Why, becasue it all gone to software, and QST won't
publish it so we can use are new skills and try and program our EPROM or
processor chip, we have to buy it, just like Popular Electronics.

When is the last time we saw a 75 watt Novice rig in QST built and
presented by the ARRL lab. Packet is the revolution for those with
interest in computers. I can use computers, and repair them, thank you. I
tried packet and sold it. My time is better spent on something that is
real time then waiting on the postman.

I, and people like me, are no longer the interest of the ARRL, or QST. I
love ham radio. It has gotten me good jobs from the skills it has given
me. I have talked to lots of people. Years ago thay all built something,
today most do not even own a good soldering iron. QST know that. I, and
the 12 and 13 year olds are no longer the target, the kit builder, and
the buyer of new equipment is because there in no money in me and a 12
year old. There never has been any money in me and my kind in ham radio
because we build from parts, which there is no money in.

We are the ones that some QST articles have made fun of because we see a
good deal in a broken radio, and can fix it, or see the value in a pile
of junk that know one elce can recognize, and are no longer recongnized
by QST.

That is why the missing chip code to the ATU article is importent. Not
because you can build the unit by odering the part, but because you can
not say, on the air, I programed the chip myself from and article in QST.




From Unknown Fri Jan 05 12:35:55 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!in2.uu.net!skypoint.com!usenet
From: "Neil A. Gjere" <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.engr.television.broadcast
Subject: HELP!! Ham Needs WR-42 Waveguide Components
Date: 3 Jan 1996 20:30:51 GMT
Organization: GjereRig Inc.
Lines: 18
Message-ID: <4cep1r$[e-mail]>
NNTP-Posting-Host: dial013.skypoint.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.misc:96451 rec.radio.amateur.equipment:23373 rec.radio.amateur.homebrew:12512 sci.engr.television.broadcast:1146

I am in desperate need of a 50 or 60 db WR-42 fixed Waveguide attenuator
as well as a 0 to 40 or 50 db WR-42 variable Waveguide attenuator.

These are being used to set up some 18 Ghz Microwave Radios. My usual
source for these type of components has gotten out of the as they put it,
"Plumbing Business"

I only need them for a short period of time, I will pay for shipping in
both directions and will reward you both financially and with unending
gratitude!!!

Please respond via:
[e-mail]

73s
Neil A. Gjere
N0PFZ



From Unknown Fri Jan 05 12:35:56 1996
Path: news.epix.net!news.sprintlink.net!service-2.agate.net!usenet
From: John Wilcox/NS1Z <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Reselling the home brew equipment
Date: 4 Jan 1996 00:05:20 GMT
Organization: Agate Internet Services (AIS)
Lines: 19
Message-ID: <4cf5k1$[e-mail]>
NNTP-Posting-Host: ns1z.sdi.agate.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Was talking with my buddy this evening on the subject of buying and
selling home brew gear. It was my opinion that home brew gear took such a
beating at the sales table/tailgate due to the fact that most hams
believe that no other ham has any construction skills and therefore, any
equipment built by Mr. No Skill is worthless, except for the parts (which
may or may not be any good!). Is this the way it is in your area of the
world? What would make a piece of HB gear more valuable to the astute
buyer?

--
John Wilcox / NS1Z
44.118.6.4
[e-mail]
204.117.6.48
[e-mail]

ns1z @ kb1bsc.fn44rn.me.usa.noam




From Unknown Fri Jan 05 12:35:57 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!multiverse!en.com!wariat.org!usenet.ins.cwru.edu!agate!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.kei.com!uhog.mit.edu!news.mtholyoke.edu!news.umass.edu!rcfnews.cs.umass.edu!usenet
From: [e-mail] (Shawn Hecker)
Newsgroups: rec.radio.amateur.homebrew
Subject: 14.230 MHz receiver?
Date: Thu, 04 Jan 1996 00:29:51 GMT
Organization: CS Dept., Umass-Amherst
Lines: 16
Message-ID: <4ces60$[e-mail]>
NNTP-Posting-Host: erau.db.erau.edu
X-Newsreader: Forte Free Agent 1.0.82

I was wondering if anyone could help me out here. A couple weeks ago I
was given a scanner (Bearcat 210). The scanner doesn't pick up 14.230
MHz (the main frequency for SSTV transmissions). Could anyone give me
a simple schematic that would receive this frequency, or a mod for my
scanner?  I read an earlier message about altering a Radio Shack
weather radio to receive 144 MHz, would this same mod work for 14.230
MHz? If so, how is it done?

Thanks in advance.

Shawn ([e-mail])

P.S. Please respond via e-mail if possible (or at least send a CC to
my e-mail address).




From Unknown Fri Jan 05 12:35:58 1996
Path: news.epix.net!news.sprintlink.net!news1.cris.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: SIMPLE SIMPLEX REPEATER....HELP
Date: 4 Jan 1996 00:33:55 GMT
Organization: Concentric Internet Services
Lines: 23
Message-ID: <4cf79j$[e-mail]>
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Xref: news.epix.net rec.radio.amateur.misc:96463 rec.radio.amateur.equipment:23384 rec.radio.amateur.homebrew:12522

I recently built the simple simplex repeater as described in 73 Amateur
Radio Today, nov 1995 issue but i have one problem that i need help
resolving. if the receiver receives a signal for about one half second or
less, the simplex repeater keys up for the entire 20 second period then
drops out. any received signal more than about a half second operates it
correctly. example: if the receiver receives a signal for 5 seconds,
after the rec signal drops, it then retransmits this signal for 5 seconds
and then resets or drops out. it is only the very quick keying pulses
that lock this thing up.

the repeater is based on the ISD1000A voice record/playback IC which can
be found at radio shack and about 30 simple parts. this chip is designed
to record a maximun of 20 seconds.

there are 2 rc delay circuits which i have tried to adjust but this does
not seem to help.  I dont think the problem is power related as i have a
good supply, and plenty of filtering and bypassing on it.
If anyone can help, please email me at [e-mail]

thanks,
Tom  WA5KUB
email: [e-mail]



From Unknown Fri Jan 05 12:36:00 1996
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From: [e-mail] (Ernest Hansen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Converting Cellular to 902MHZ band
Date: 4 Jan 1996 00:39:44 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 19
Distribution: world
Message-ID: <4cf7kg$[e-mail]>
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X-Newsreader: Version 1.2

rec.radio.amateur.homebrew
[1] Converting Cellular to 902MHZ band
[e-mail]


Does anyone have any advice, recomendations, information or pointers to
information on converting cellular telephone equipment to the 902 MHZ
amateur band? Is it possible? Post or Email me at [e-mail].
Thank You Very Much.




-
  ERNIE [e-mail]






From Unknown Fri Jan 05 12:36:01 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!news.cc.swarthmore.edu!psuvax1!news.math.psu.edu!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: Re: Reselling the home brew equipment
Message-ID: <[e-mail]>
Organization: Organization? Me?
References: <4cf5k1$[e-mail]>
Date: Thu, 4 Jan 1996 00:44:10 GMT
Lines: 36
Sender: [e-mail]

In article <4cf5k1$[e-mail]> John Wilcox/NS1Z <[e-mail]
te.net> writes:
>Was talking with my buddy this evening on the subject of buying and
>selling home brew gear. It was my opinion that home brew gear took such a
...
>world? What would make a piece of HB gear more valuable to the astute
>buyer?

I have bought several homebrew amplifiers. Usually projects derived from
publications (my interest is in VHF/UHF high power amps). In this case there
is little alternative to homebrew. Power amps are simple enough you can
visually tell the condition (except for tubes), and it's not too hard to
figure out the value of parts and labor and get documentation (in the form
of original publications). A project faithfully built to published docs
(such as a K2RIW amplifier) I think is worth a good price.

Homebrew solid state gear has for me generally been a disappointment and I
tend to avoid it unless it's a specialty for me (tiny QRP, etc., again with
some related documentation).

I _always_ avoid "homebrew" computers and related parts - too hard to know
if it's working without GOOD recourse.

73 Dave WB0GAZ [e-mail]
>
>--
>John Wilcox / NS1Z
>44.118.6.4
>[e-mail]
>204.117.6.48
>[e-mail]
>
>ns1z @ kb1bsc.fn44rn.me.usa.noam
>
>




From Unknown Fri Jan 05 12:36:02 1996
Path: news.epix.net!news.sprintlink.net!news.inc.net!novia!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!news.mindlink.net!agate!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Reselling the home brew equipment
Date: 4 Jan 1996 02:53:53 GMT
Organization: Los Alamos National Laboratory
Lines: 27
Message-ID: <4cffg1$[e-mail]>
References: <4cf5k1$[e-mail]>
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To: [e-mail]

HB gear is next to worthless resale-wise because it IS
homebrew.  There is no factory to contact regarding parts,
design, schematics, or service information.  I'm not trying to
belittle homebrew gear, I'm a very avid homebrewer myself but
facts are facts.  Buying a hb circuit for the parts is a bad
deal too since it is so labor intensive to try to salvage out
parts.
About the only exception to this might be well made RF
amplifiers which use common designs as well as universally
available parts (usually).
Thus, my advice would be for you to hang on to your homebrew
projects and show them to your grandkids or something or just
drag them out and sigh over them in later years.  Don't even
salvage them for new projects.  You will doubtless someday wish
you still had those projects around.  I sure wish I had
followed this advice for so many of my projects of years ago
that were then (and would be still) useless to most would-be
buyers but priceless to the original builder or his family.

--
|-------------------------------------------------------|
|Jim Devenport  WB5AOX                                  |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|-------------------------------------------------------|




From Unknown Fri Jan 05 12:36:03 1996
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design
Path: news.epix.net!news.sprintlink.net!newshub.cts.com!usc!chi-news.cic.net!nntp.coast.net!zombie.ncsc.mil!news.mathworks.com!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.ak.net!not-for-mail
From: [e-mail] (Hello)
Subject: PCB for RF and linear ?
Message-ID: <137cc$[e-mail]>
Date: Thu, 04 Jan 1996 03:09:40 GMT
Lines: 21
Xref: news.epix.net rec.radio.amateur.homebrew:12518 sci.electronics.design:1007

Hello,

I bought a few years ago LAYO. I followed (and paid a lot) every
upgrade. Today I think I made a wrong choice. The evolution of this
product is poor. It's very borring to use because you have to
translate between two products (one product for drawing and another
for design PCB). For linear circuits with ground plane... I stop here,
it's become incredible !

1) I have linear and RF circuit to design : Is there a freeware, I can
download to quickly do my work ?

2) Is there an interesting product ? (with a concurrential offer ?)

Thanks for help
Email [e-mail]

Happy
New              [e-mail]
Year




From Unknown Fri Jan 05 12:36:03 1996
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newshub.cts.com!usc!elroy.jpl.nasa.gov!swrinde!newsfeed.internetmci.com!in1.uu.net!news.ak.net!not-for-mail
From: [e-mail] (Hello)
Subject: MC1496/1596 obsolete ?
Message-ID: <137cc$[e-mail]>
Date: Thu, 04 Jan 1996 03:09:57 GMT
Lines: 10
Xref: news.epix.net sci.electronics.components:984 rec.radio.amateur.homebrew:12520

Hello,

Is there a remplacement for this chips ?

Happy New Year.
[e-mail]
Happy
New              [e-mail]
Year




From Unknown Fri Jan 05 12:36:04 1996
Newsgroups: sci.electronics,rec.radio.amateur.homebrew,sci.electronics.components
Path: news.epix.net!news.sprintlink.net!newshub.cts.com!usc!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.ak.net!not-for-mail
From: [e-mail] (Hello)
Subject: Need POS150 VCO spec's or quality VCO
Message-ID: <137cc$[e-mail]>
Date: Thu, 04 Jan 1996 03:10:20 GMT
Lines: 11
Xref: news.epix.net sci.electronics:164790 rec.radio.amateur.homebrew:12521 sci.electronics.components:985

Hi,

Looking for POS150 spec's. It's a VCO.

All informations about VCO for 80-110 frequencies with very low
distortion and low harmonics are welcome.

Happy
New              [e-mail]
Year




From Unknown Fri Jan 05 12:36:05 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!bcm.tmc.edu!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!chi-news.cic.net!news.uiowa.edu!uunet!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: SIMPLE SIMPLEX REPEATER....HELP
Date: 4 Jan 1996 03:17:09 GMT
Organization: Los Alamos National Laboratory
Lines: 28
Message-ID: <4cfgrl$[e-mail]>
References: <4cf79j$[e-mail]>
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Xref: news.epix.net rec.radio.amateur.misc:96500 rec.radio.amateur.equipment:23413 rec.radio.amateur.homebrew:12544


I couldn't believe I had this issue of 73 right in a small pile
at my fingertips.  Your description of the problem plus a
perusal of the schematic makes me suspect some "squirrelies".
I note the COS input line is bypassed with C3, a .22 uf
capacitor.  Is this in place and is it close to U4?  If it is,
I recommend the following:
-Try installing .1 or .2 uf capacitors physically close to pins
4&5 of U3, pins 9 and 10 of U3, and pin 27 of U1.
-I don't see it in the circuit but all your IC's, especially
the logics (U3 and U4) should have the VCC pins bypassed with a
1 to 1 uf or so electrolytic mounted as close to the IC's as
possible and with as short a connection to circuit ground or
the IC ground as possible.  I'd suggest this as your first
priority.
-You may also be experiencing RFI from your attached
transceiver.  It probably should be mounted in a good rf-proof
box with incoming and outgoing wiring bypassed and/or choked
with ferrite shells and other RFI reducing techniques.
Good luck with the project.  Hope some of this helps!
--
|-------------------------------------------------------|
|Jim Devenport     WB5AOX                               |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|-------------------------------------------------------|




From Unknown Fri Jan 05 12:36:07 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!hookup!noc.tor.hookup.net!news
From: [e-mail] (Craig Stimson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need AA-size dummy cell/bridge
Date: Thu, 04 Jan 1996 04:12:33 GMT
Organization: HookUp Communication Corporation, Oakville, Ontario, CANADA
Lines: 18
Message-ID: <4cfk6r$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: cstimson.tor.hookup.net
X-Newsreader: Forte Free Agent 1.0.82

Hi David,

Radio Shack may carry these as a replacement part to their TRC series
11M GRS HT's. I Have an old TRC-201 that supplied two of these "dummy"
batteries to use when you filled up the battery case with regular 1.5V
AA cells instead of Ni-Cads. They probably wouldn't have them in the
store but you could get them special ordered.

Hope this helps.

73
Craig
++++++++++++++++++++++++++++++++++++++++++
+  Craig Stimson                         +
+  E-mail: [e-mail]           +
+  AX.25 : VA3DCS@VE3ZRD.#SCON.ON.CA.NA  +
++++++++++++++++++++++++++++++++++++++++++



From Unknown Fri Jan 05 12:36:07 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 4 Jan 1996 08:39:55 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
Message-ID: <4cglbb$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader


>I built the kit and was quite impressed with it. Works as advertised and
>only glitch was inserted by myself. It is now installed in the Jimmy
>under the IC-706 and working against a mobile 4 band Hustler style
>antenna on the rear bumper. What's the big deal, haven't seen anyone
>complain about Yaesu, Kenwood or Icom not giving their stuff away.....
>

Hi,

I'm curious how the software works. Does it just change something at
random and see what happens, and if SWR gets better keep going in that
direction?

If you make a large load or band change how long does it take to tune?

73 Tom



From Unknown Fri Jan 05 12:36:08 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!overload.lbl.gov!agate!howland.reston.ans.net!swrinde!cssun.mathcs.emory.edu!atglab.bls.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Thu, 04 Jan 96 10:01:51 PDT
Organization: BellSouth ATG lab
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]>  <[e-mail]>
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>
> That is why the missing chip code to the ATU article is importent. Not
> because you can build the unit by odering the part, but because you can
> not say, on the air, I programed the chip myself from and article in QST.
>
>
>
Excellent comments.  I, too, am one of those people who grew up scrounging
parts from old TV's and radios.  I enjoy thinking about, planning, obtaining
parts for, and building things much more than operating them.

I have been contemplating, for a few years, a home-brew ATU.  Coincidentally,
I planned to use the Motorola 68HC11 micro-controller chip, just like the one
in QST, because I have the development board for it.

The stimulating exercize, in my opinion, is developing the algorithm to
iterate to the match (with the L network, there's only one).  I had thought
that both the phase and magnitude of the impedance (seen by the ATU) would be
needed to drive the iteration routine for both the capacitance and inductance.

Not having the 6811 source code, I don't know how the ATU in the article
works, but it looks like only the SWR is used.  One can only guess that a
'brute-force' search is used until an acceptable value of SWR is found.

So, when I saw the article, the first thing I looked for was the source code.

When I saw that it wasn't available, I was no longer interested.

KO4CY



From Unknown Fri Jan 05 12:36:10 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.west.net!usenet
From: [e-mail] (qrk)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: Thu, 04 Jan 1996 10:41:06 GMT
Organization: Marginal
Lines: 10
Message-ID: <4cgb3t$[e-mail]>
References: <137cc$[e-mail]>
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X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net sci.electronics.components:990 rec.radio.amateur.homebrew:12523

[e-mail] (Hello) wrote:

>Is there a remplacement for this chips ?

You might try the LM1496 from National Semiconductor.  According to a
new parts catalog, it is still available from National Semiconductor.

-
Mark Chun  |  [e-mail]  |  Santa Barbara, CA



From Unknown Fri Jan 05 12:36:11 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Converting Cellular to 902MHZ band
Date: 4 Jan 96 13:28:00 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


on 4 Jan 1996 00:39:44 GMT [e-mail] (Ernest Hansen)
writes:

 -Does anyone have any advice, recomendations, information or pointers to
 -information on converting cellular telephone equipment to the 902 MHZ
 -amateur band? Is it possible? Post or Email me at [e-mail].
 -Thank You Very Much.
 -
 -  ERNIE [e-mail]

Difficult and expensive.  It would be cheaper to just buy the 900MHz
rig.  You have the problems with the very sharp filtering in the
transmit and receive portions of the phone.  Remember, the transmit
and receive at the same time just like a repeater.  They have VERY
sharp bandpass filters to prevent the transmitter from desensing
the receiver.  You would have to change both of these filters.  You
would then have to change out the transmit module that is specifically
designed to transmit in the 830MHz band.  Most of these modules
use direct digital synthesis that is controlled by CPU by specific
"memory addresses."  ie.  10100111 might mean "transmit on
832.875MHz" so the transmit module transmits on only a specific set
of frequencies.  The same is true for the receive module.  Now if you
can find one of the old (10+years) phones you might be able to
modify one of those.  They had a separate digital synthesizer and
signal generator.  Many of them used Z80 CPUs.
Good luck

Kevin, WB5RUE
[e-mail]


From Unknown Fri Jan 05 12:36:12 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!eff!news.duke.edu!agate!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Linear Transverters
Date: 4 Jan 96 14:12:00 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


I am planning to buy a transverter (2 meter) that requires
1mw to 10mw input.  My rig can be turned down to about
5 watts output.  Should I just build a 20db attenuator or is
there a better way?

thanks

Kevin, WB5RUE
[e-mail]


From Unknown Fri Jan 05 12:36:12 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!oleane!tank.news.pipex.net!pipex!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!in1.uu.net!winternet.com!guitar.sound.net!news
From: [e-mail] (artus)
Newsgroups: rec.radio.amateur.homebrew
Subject: "Shooter" EPROMMER
Date: Thu, 04 Jan 1996 15:48:07 GMT
Organization: Sound Advice Limited's Internet Access for KC
Lines: 5
Message-ID: <4cglm3$[e-mail]>
NNTP-Posting-Host: max1-27.sound.net
X-Newsreader: Forte Free Agent 1.0.82

I have a Prompro PP4 (SN 5278) Shooter programmer, but no configurator
chips.  Does anyone know how these chips work?  I assume they may just
be shorting jumpers for the various PROMs. I've dropped a couple
EMails to Logical Devices but no response.  Thanks.



From Unknown Fri Jan 05 12:36:14 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.inc.net!news.uoregon.edu!news.u.washington.edu!news.alt.net!news1.alt.net!news.exodus.net!aimnet.com!news.ossi.com!agate!howland.reston.ans.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Reselling the home brew equipment
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4cf5k1$[e-mail]>
Date: Thu, 4 Jan 1996 16:36:59 GMT
Lines: 53

In article <4cf5k1$[e-mail]> John Wilcox/NS1Z <[e-mail]
te.net> writes:
>Was talking with my buddy this evening on the subject of buying and
>selling home brew gear. It was my opinion that home brew gear took such a
>beating at the sales table/tailgate due to the fact that most hams
>believe that no other ham has any construction skills and therefore, any
>equipment built by Mr. No Skill is worthless, except for the parts (which
>may or may not be any good!). Is this the way it is in your area of the
>world? What would make a piece of HB gear more valuable to the astute
>buyer?

Most homebrew gear has no documentation, no support, and may be one of
a kind. Now used commercial gear may have no documentation too, but you
can usually find some, either from the manufacturer or from other users.
If the commercial gear is relatively recent, it may also still have
manufacturer support and parts available. Even if it is old, there are
likely thousands of other units out there as points of potential salvage
(see Micor or GE Mastr). Your homebrew offering has none of this. It
is like an orphaned piece of equipment from a defunct company. Unless
there's some collector value, people won't usually pay more than salvage
prices for that type of gear.

Now that should give you an idea how to increase the value of your
homebrew gear on the market. Make sure there is full documentation,
operating instructions, schematics, theory of operation, parts lists,
and even X-ray view board layouts if applicable. This should all be
nicely organized and bound, and included with the equipment. The
equipment will still be an orphan, but it will be a more valuable
orphan because of the information that would otherwise have to be
puzzled out by the buyer. (This is *very* important to me.)

As to builder skill, I treat this somewhat the same way I would
when buying a used Heathkit. I look at the unit and see how
professional it looks. Someone who has taken the time to make
up professional looking panels, who has soldered neatly, and
who has paid attention to wiring dress, probably also took
some care in design. Therefore I'm more likely to pay a good
price for something that *looks* like quality equipment than
I am for something that looks like Rube Goldberg haywire junk.

If the seller will additionally be willing to demonstrate the
equipment, and/or offer a brief warranty period, then I'm *much*
more likely to pay him a better price.

In short, the closer your homebrew gear approaches commercial
standards and practices, the closer I'm willing to pay comercial
prices.

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


From Unknown Fri Jan 05 12:36:15 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 4 Jan 1996 17:15:13 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 51
Message-ID: <4ch1v1$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

[e-mail] wrote:


: I have been contemplating, for a few years, a home-brew ATU.  Coincidentally
,
: I planned to use the Motorola 68HC11 micro-controller chip, just like the on
e
: in QST, because I have the development board for it.

: The stimulating exercize, in my opinion, is developing the algorithm to
: iterate to the match (with the L network, there's only one).  I had thought
: that both the phase and magnitude of the impedance (seen by the ATU) would b
e
: needed to drive the iteration routine for both the capacitance and inductanc
e.

Over 25 years ago, I worked on the Collins 490T antenna tuner when I was in
the Navy.  That box will tune a "random wire" antenna pretty much anywhere
in the 2-30MHz range.  It has no processor:  it uses a rather small array
of silicon controlled switches to sequence through its procedure.  It is
rated to tune a new load within 5 seconds, but our rule of thumb was that
if it took over a second and a half, it likely had a problem.  It used
motor-driven vacuum variables and inductors.  It did have both phase and
SWR sensors.  Anyway, the point is that you don't really need a processor
to accomplish the tuning procedure, though that's probably the easiest way
to do it these days.  But clearly, in the case of the 490T, the algorithm
wasn't terribly complex, and AT LEAST there should be no reason for not
providing plenty of detail about the procedure, if not the code itself.

: So, when I saw the article, the first thing I looked for was the source code
.
: When I saw that it wasn't available, I was no longer interested.

(Moved from the beginning of Gary's post...)
: Excellent comments.  I, too, am one of those people who grew up scrounging
: parts from old TV's and radios.  I enjoy thinking about, planning, obtaining

: parts for, and building things much more than operating them.

Me too.  In fact, I still have no trouble scrounging all the parts I
would need to do any of the basics of getting on the air, though I'm
also interested in playing with things like DSPs, and I'm willing to pay
for inexpensive evaluation boards that provide assemblers and similar
tools.

But on the other side of the coin:  I sometimes get printed circuit boards
that are loaded with parts that would be quite useful to someone homebrewing
RF or audio equipment.  I've found that I have trouble even _giving_ these
things away.  My conclusion is that there must just not be _that_ many
people experimenting with electronics and homebrewing things, or else all
those that are are getting all the free parts they need.


--
Cheers,
Tom
[e-mail]


From Unknown Fri Jan 05 12:36:17 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need AA-size dummy cell/bridge
Date: Thu, 4 Jan 1996 17:43:00 -0800
Organization: Call America Internet Services  [phone]
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Dave....why buy????  A proper sized wooden dowel and a piece of wire will do!
Cliff Buttschardt   W6HDO

On Tue, 2 Jan 1996, David Feldman wrote:

> I'm looking for a source of dummy cells, AA size. These would be used when
> (for example) you want to use 6 alkaline (1.5V) cells in lieu of 7 nicad
> (1.2V) cells and need to bypass one of the cells in a way that's mechanicall
y
> sound. Has anyone seen these for sale anywhere?
>
> 73 Dave WB0GAZ [e-mail]
>
>


From Unknown Fri Jan 05 12:36:18 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Thu, 4 Jan 1996 18:02:05 -0800
Organization: Call America Internet Services  [phone]
Lines: 2
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <4ccgnl$[e-mail]> <4ch6fi$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4ch6fi$[e-mail]>

Your comments and observations regarding the automatic antenna tuner
article is right, spot on the money!  73  Cliff Buttschardt  W6HDO


From Unknown Fri Jan 05 12:36:18 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Joel Gamble )
Newsgroups: rec.radio.amateur.homebrew
Subject: FT757GXII filter mod HELP!!
Date: 4 Jan 1996 18:29:04 GMT
Organization: Netcom
Lines: 6
Message-ID: <4ch69g$[e-mail]>
NNTP-Posting-Host: ix-cht-tn1-20.ix.netcom.com
X-NETCOM-Date: Thu Jan 04 10:29:08 AM PST 1996

Can anyone help me with the modification that enables the Narrow CW
filter to work on SSB?The rig is the FT757GXII.I understand it is
different from the other FT757 models.Any help/suggestions/comments are
welcomed.     Thanks!
                Ko4qC



From Unknown Fri Jan 05 12:36:20 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 4 Jan 1996 18:32:18 GMT
Organization: Netcom
Lines: 33
Message-ID: <4ch6fi$[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <4ccgnl$[e-mail]>
NNTP-Posting-Host: val-ca1-21.ix.netcom.com
X-NETCOM-Date: Thu Jan 04 10:32:18 AM PST 1996

In <4ccgnl$[e-mail]> John Wilcox/NS1Z
<[e-mail]> writes:

>...What's the big deal, haven't seen anyone
>complain about Yaesu, Kenwood or Icom not giving their stuff away.....

The "big deal" to some of us is that the tuner was presented in a
build-it-yourself article, not in a product review.  It's disengenuous
to publish a schematic for the whole world to see and at the same time
decide the source code must be kept secret.  In fact, some magazines
require that source code be made available, via BBS or other methods.
The greatest value in DIY articles is probably not in the constructing
of exact clones, but in seeing how somebody else solved a problem, and
in providing a starting point for trying something new.  Many people
might be interested in trying a similar circuit with a different micro
installed, or in running the tuner from a PC, just as others would use
different relays or other components.  However, with the micro
presented as a black box, we learn nothing of how the device works.  We
are presented with a hardware schematic but not with a software
schematic.  For those who say that it's unlikely that anbody would
program their own chip, I'd just say look at the number of assemblers,
compilers and programming devices on the market, compared to, say, the
number of sources for toroid cores.  The ability is there.

I believe one of the authors has written that they did offer a detailed
flowchart when they submitted their article, but QST chose not to print
it.  If that is the case then I think the authors are partially
exonerated and QST is partially to blame.  As I said, if they wanted to
do a product review they should have called it a product review.

73,
Mike, KK6GM



From Unknown Fri Jan 05 12:36:21 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet
From: [e-mail] (Roland Geter sr)
Newsgroups: rec.radio.amateur.homebrew
Subject: "%%% WANTED COLLINS SC-101 %%%"
Date: 4 Jan 1996 18:37:46 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 8
Distribution: world
Message-ID: <4ch6pq$[e-mail]>
NNTP-Posting-Host: inugap4.news.prodigy.com
X-Newsreader: Version 1.2

Will pay cash and shipping for "dead or alive" unit ANY CONDITION!!
Call me @ 800-399-4383 x765 24hrs.
-
  ROLAND S GETER SR
         WB6LNA
  [e-mail]




From Unknown Fri Jan 05 12:36:22 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!weld.news.pipex.net!pipex!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!lade.news.pipex.net!pipex!news.ftech.net!news
From: Niels Montanana <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 116 Oscillator
Date: 4 Jan 1996 19:07:02 GMT
Organization: Frontier Internet Services
Lines: 3
Message-ID: <4ch8gm$[e-mail]>
NNTP-Posting-Host: lcpub.ftech.co.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: all

Does anyone have a good circuit design for a 116Mhz oscillator with
+17dbM output suitable for a 2m - HF transverter ?



From Unknown Fri Jan 05 12:36:22 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.deltanet.com!usenet
From: [e-mail] (Michael J. Krueger)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Motorola Handie-Talkie freqs?
Date: Thu, 04 Jan 1996 21:39:47 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 18
Message-ID: <4chkuj$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: delta1.deltanet.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.homebrew:12541 rec.radio.amateur.equipment:23411

Since you didn,t state the model #, They could be anywhere...... Best
thing (and least expensive) is to borrow a frequency counter and check
it out. Don't be suprised if you can't find the right PL tone on your
Standard. HT-600's have non-standard and digital PL's.
Good luck.....

-Mike
[e-mail] (Michael Fogarty) wrote:

>A friend has a pair of Motorola HT600's.  They're two channel, commercial
>grade HTs.  Trouble is, they don't seem to say on which frequencies they
>xmt and rcv.  I'd like to be able to tune in with my Standard HT.  Does
>anyone have this information?

>Thanks,
>mfogarty




From Unknown Fri Jan 05 12:36:23 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!istar.net!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!news.cyberplus.ca!not-for-mail
From: Marcos Antonio Gallego <[e-mail]>
Subject: How to build a TNC?
Message-ID: <147cc$[e-mail]>
Date: Fri, 05 Jan 1996 01:07:29 GMT
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=us-ascii
Lines: 8

Hi all,

I'm looking for an article that can help me in how to build a TNC...
Regards,

Marcos





From Unknown Fri Jan 05 12:36:24 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!ra.nrl.navy.mil!lamarck.sura.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!pmafire!usenet
From: Jack Mott <[e-mail]>
Subject: 900 MHz Security
Sender: [e-mail] (usenet guy)
Message-ID: <[e-mail]>
Date: Fri, 5 Jan 96 02:11:00 GMT
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Organization: WINCO
Lines: 9

This posting is off-subject for this newsgroup, but I wanted access to
the technical knowledge available here.  I have a 900 MHz digital
cordless phone (ATT 9100), and I am interested in how secure this type of
phone is with respect to over-the-air eavesdropping.  Please give a
specific, technical answer addressing issues such as RF modulation and
digital encoding.  If you post a response, please also send e-mail.

Charles Mott



From Unknown Tue Jan 09 18:26:58 1996
Path: news.epix.net!news.sprintlink.net!quiknet3.quiknet.com!calweb!pagesat.net!netserv.com!aimnet.com!news.ossi.com!agate!howland.reston.ans.net!swrinde!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Question:  RF Speech Processing
Date: Fri, 05 Jan 96 08:23:25 GMT
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

Rf speech processors normally use the SSB signal already present
inside a transmitter.  They clip this signal, then filter it with
a second IF filter.  In a 9 MHz IF, the harmonics generated by the
clipping process fall around 18 MHz, 27 MHz etc., so they're easily
removed by the second filter.  I'm beginning to wonder if this is
really necessary though, particularly if the processor is an outboard
accessory.

For example, say the outboard unit used a 6 MHz carrier oscillator,
fed to a balanced modulator, in order to produce a 6 MHz double
sideband signal.  If that signal was clipped, won't the harmonics
fall on 12 MHz and above?  If so, the clipped signal could be
filtered with an L/C low-pass filter, then converted back to
baseband (audio) using a product detector and the same 6 MHz
oscillator.  This would eliminate the cost of two expensive filters.

I've never seen this done, so maybe I'm overlooking something.
Anyone know of a reason it won't work?

73,
Jack WB3U


From Unknown Tue Jan 09 18:26:59 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!newsxfer2.itd.umich.edu!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: QST Tuner article
Date: 5 Jan 96 15:13:45 GMT
Organization: ucsd usenet gateway
Lines: 36
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I foolishly posted several opinions on this subject over on qrp-l (or
was it boat anchors?) just before the holidays.  I had only scanned
the article with the Christmas rush coming.

Many of the posts criticizing the authors and QST have lamented not
being able to take the article and produce a project ranging from
totally built from scrounged parts to bought the kit from the authors
and put it together.  I find that this article allows exactly this
range!

I finally read the article carefully yesterday and found that, to the
credit of the authors, the algorithm for setting the tuning is quite
clearly described in the text in very general terms.  I wish that QST
had let them put in the flow chart (yech! We professional software
types haven't used those in years) or other description of the
algorithm to more precisely describe what is going on, but the prose
is sufficient to do the job.

I found that what a few others suggested is quite possible. There is
enough information to use another processor or a PC to do the job.  An
old XT class machine that is otherwise only useful as a door stop
would work quite well.  You only need 16 DC control lines to run the
relays so you could easily do it from the parallel port of any PC with
just a few latches and decode circuitry.  Then you need some sort of
A/D converter to do the VSWR data collection.

The board that is available could easily be modified to bring out the
I/O lines for use with another controller if you don't want to roll
your own.

Gee. All that bandwidth!

Ray Mack
WD5IFS
[e-mail]



From Unknown Tue Jan 09 18:27:01 1996
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!msunews!agate!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Fri, 05 Jan 96 16:36:20 PDT
Organization: Northwest Nexus Inc.
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]>  <[e-mail]>
NNTP-Posting-Host: blv-pm10-ip5.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


I guess that I missed the start of this thread, but I've seen the article
and like many of you, I was disappointed that the source code was hidden.
It actually doesn't look like it would be all that difficult to duplicate
the software, from the description in the article, I got the impression
that the software varies the inductor for closest match and then varies
the cap over all the combinations.

In any case, I have to agree with the idea that it should have been
called a product review instead of construction - and QST is doing this
far too often.  It isn't just software.  A few months ago they published
an article for an ATV transmitter and receiver (don't remember the exact
frequency band) but the pcb pattern was not available for one of the
components.  Too bad you say, well with stripline components on the board
it would be difficult to build without this additional information.

73 de KI7RH (Jay)




From Unknown Tue Jan 09 18:27:02 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.homebrew
Subject: 900 MHz Security
Date: 5 Jan 96 17:14:00 GMT
Organization: ucsd usenet gateway
Lines: 42
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


Fri, 5 Jan 96 02:11:00 GMT From: Jack Mott <[e-mail]>
writes:
 -
 -This posting is off-subject for this newsgroup, but I wanted access to
 -the technical knowledge available here.  I have a 900 MHz digital
 -cordless phone (ATT 9100), and I am interested in how secure this type of
 -phone is with respect to over-the-air eavesdropping.  Please give a
 -specific, technical answer addressing issues such as RF modulation and
 -digital encoding.  If you post a response, please also send e-mail.
 -
 -Charles Mott

If you are worried about someone on their scanner listening in then
there isn't a problem.  All they will hear is a sound like a high speed
modem.  Your phone might also be spread-spectrum.  If this is the
case then anyone would be hard-pressed to lock in on your signal.
As far as RF modulation, it is probably FM with 5kHz deviation.
The digital sampling is sent in a packet form, short
sections of encoded data with CRC error checking/correction.
The handset and base "lock" onto each other with a specific "code"
each time the handset is hung on the base and removed.  This prevents
someone, your neighbor for instance, from accidentally using
your phone line with his ATT 9100 phone.  This code changes each
time the handset is placed on the base.  This "code" is a 16 bit data
word so there are 65536 combinations.  The base will (should) ignore
any handset that doesn't have the right code in the digital data stream.
There is probably no encryption of the data.  Since your phone and
base are communicating back and forth with a digital signal it would
be very unlikely that someone, even with the same model phone, would
be able to tap into your conversation since the bogus handset would
not be able to "lock" onto the data stream because the base would
either ignore it (not the original caller) or would cause your handset
to change channels because of interference from the bogus handset.
Now I suppose someone could build a receiver that would decode the
data stream in a "listen only" mode.  They would have to know the exact
encoding scheme that ATT used for that model phone.

I hope this helps.

Kevin, WB5RUE
[e-mail]


From Unknown Tue Jan 09 18:27:04 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip21.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Profitting from QST articles  (long)
Date: Fri, 5 Jan 1996 19:09:19 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 70
Distribution: world
Message-ID: <[e-mail]>
References: <4chf6s$[e-mail]> <4cjkod$[e-mail]>
NNTP-Posting-Host: usr7ip21.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4cjkod$[e-mail]> [e-mail] (Harry H. Brown)
writes:
>From: [e-mail] (Harry H. Brown)
>Subject: Re: Profitting from QST articles  (was QST Automatic Tuner Article)
>Date: 5 Jan 1996 16:48:13 GMT

>Does anyone know of anyone that has ever made money from an article in any ha
m
>magazine? I know several guys that have written several articles and they lik
ely
>have only increased the amount of time that they have donated back to the hob
by.
>I don't think they ever expected to make a cent.

>As far as I am concerned, if one of them has the luck to make anything then
>that's great. I'll be surprised though if it's anything close to minimum wage
.

>73, Harry, W3IIT

I don't know what my position is on this thread; I can see it from both sides.

I can tell you a personal story, however, which in my mind answers the
profit question.

I wrote and had published in the September 1979 issue of Ham Radio Magazine an

article titled "Split-band Speach Processor". I was pleased to have it be the
lead article and be featured on the cover. The article ran eight pages and I
was paid $350. On a time and materials basis, I probably made well under a
dollar an hour. The article included complete schematics, PC board artwork and

parts placement drawings as well as design equations. I paid a friend $100 to
lay out the boards and tape the artwork.  This was in the days before word
processors and auto-routers BTW. I offered no kits or PC boards.

Shortly after publication, I began receiving requests for PC boards and I was
forced to reply that I did not have a supply. I casually mentioned this to
another friend who allowed that he would put up the funds to have some made
and we could sell them and split the profit(?). So off we went and ordered 100

sets of boards at a cost of a shade over $700.

No sooner having done this, and before taking delivery, I received a board in
the mail from Circuit Board Specialists, along with a letter informing me that

they would be selling boards for my project. I also noted that the boards were

Hi-Fi; they even included the hr logo and MY call sign. Seeing our $700
suddenly go down the tube, I placed a call to Jim Fisk, Editor of hr. I
naively thought that maybe he would use Copyright to prevent further
production. He basically said he didn't care and "Oh, by the way, there will
be a kit for your processor introduced shortly." What he didn't mention was
that it would be introduced by Radiokit, his new company. Ethics. He did
suggest that I run a classified ad in hr; which I did.

We ultimately sold the 100 boards and another hundred too. I also sold, at
cost, a Plessey IC that was readily available locally, but nowhere else in
the world. We got $12 for the boards that cost a bit over seven. After
figuring the time spent addressing envelopes, answering letters, etc., this
was a loosing proposition too.

Was it rewarding otherwise?  You bet!  I got letters and orders literaly from
around the world. I learned how things are delivered into some foreign
countries so the post office worker doesn't get them. I made some friends. One

Australian club made it a club project, over ten years later. I got some
deserved criticism, which I might add was dutifully published in hr along with

my response. I got some glowing testimonials. I even got to answer questions
from folks that bought from Radiokit. I hope I added a little something to the

hobby. All in all, it was a great experience. Profitable monetarily?  No way.
Would I do it again? I dunno.

I have some other article ideas. Would QST publish them?  Probably not. If
they did, would I try to make a buck?  No. Do I have a problem with those that

do? Ethically, yes.  Pragmatically, no.

End of story, thanks for listening.

Regards, Wes -- N7WS




From Unknown Tue Jan 09 18:27:05 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!usenet
From: James Garland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: 5 Jan 1996 20:47:33 GMT
Organization: The Ohio State University
Lines: 9
Message-ID: <4ck2p5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: maps1.mps.ohio-state.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

That's a great idea, Jack, but I'm afraid you're not the first to think
of it. As I recall, there were several audio processors on the market
during the 70's which used the basic idea: mix an audio-derived DSB
signal up to an IF (usually 50-500KhZ), clip it, then mix it back to
audio. ETO sold one of these units, if I remember correctly, as did
VOMAX. I also recall reading a do-it-yourself article on the concept in
one of the ham mags -- probably Ham Radio.
Jim W8ZR



From Unknown Tue Jan 09 18:27:07 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip52.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: Fri, 5 Jan 1996 21:28:28 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 36
Message-ID: <[e-mail]>
References: <[e-mail]> <4ck2p5$[e-mail]>
NNTP-Posting-Host: usr7ip52.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4ck2p5$[e-mail]> James Garland <garland@ohst
py.mps.ohio-state.edu> writes:
>From: James Garland <[e-mail]>
>Subject: Re: Question:  RF Speech Processing
>Date: 5 Jan 1996 20:47:33 GMT

>That's a great idea, Jack, but I'm afraid you're not the first to think
>of it. As I recall, there were several audio processors on the market
>during the 70's which used the basic idea: mix an audio-derived DSB
>signal up to an IF (usually 50-500KhZ), clip it, then mix it back to
>audio. ETO sold one of these units, if I remember correctly, as did
>VOMAX. I also recall reading a do-it-yourself article on the concept in
>one of the ham mags -- probably Ham Radio.
>Jim W8ZR

The Comdel CSP-11 was another one.

There are some intermodulation products to contend with tho. Maybe Bill Sabin
will help us here.

Some references:

"R.F. Clippers for S.S.B." by William Sabin, W0IYH, QST, July 1967.

"Ordinary and Processed Speech In S.S.B. Application" by Harold Collins,
W6JES, QST, Jan 1969.

"Speech Clipping in Single-sideband Equipment" by Walter Schreuer, K1YZW, ham
radio magazine, Feb 1971.

"Performance of RF SPeech Clippers" by Leslie Moxon, G6XN, ham radio magazine,

Nov 1972.

"Split-band Speech Processor" by Wes Stewart, N7WS, ham radio magazine, Sept
1979.




From Unknown Tue Jan 09 18:27:08 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsjunkie.ans.net!news.agt.net!news
From: [e-mail] (Steve Mason)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Fri, 05 Jan 1996 21:36:33 GMT
Organization: AGT Ltd.
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: clgrpt06-port-30.agt.net
X-Newsreader: Forte Agent .99c/16.141

On Fri, 5 Jan 1996 15:49:27 GMT, [e-mail] (Gary Coffman) wrote:

>I reread the article carefully last night. From the author's description,
>the algorithm *is* just a brute force search. First the L is stepped for
>lowest VSWR,

>That seems horribly crude, and only works at all because the L network

> The assumption seems to be that as long as the VSWR is below 1.5:1
> the no-tune transceiver will be happy so that's "good enough".

Does anyone know if the SGC autotuners do it differently, and are any better?

Steve VE6STV



From Unknown Tue Jan 09 18:27:09 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Question:  RF Speech Processing
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sat, 6 Jan 1996 00:10:36 GMT
Lines: 32

In article <[e-mail]> [e-mail]
.com (WB3U) writes:
>
>Rf speech processors normally use the SSB signal already present
>inside a transmitter.  They clip this signal, then filter it with
>a second IF filter.  In a 9 MHz IF, the harmonics generated by the
>clipping process fall around 18 MHz, 27 MHz etc., so they're easily
>removed by the second filter.  I'm beginning to wonder if this is
>really necessary though, particularly if the processor is an outboard
>accessory.
>
>For example, say the outboard unit used a 6 MHz carrier oscillator,
>fed to a balanced modulator, in order to produce a 6 MHz double
>sideband signal.  If that signal was clipped, won't the harmonics
>fall on 12 MHz and above?  If so, the clipped signal could be
>filtered with an L/C low-pass filter, then converted back to
>baseband (audio) using a product detector and the same 6 MHz
>oscillator.  This would eliminate the cost of two expensive filters.
>
>I've never seen this done, so maybe I'm overlooking something.
>Anyone know of a reason it won't work?

I haven't worked through the math, but I think the problem is
with clipping DSB. If the clipping isn't perfectly symmetric,
IE both positive and negative frequency, some horrible *in-band*
distortion products are likely to be produced.

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


From Unknown Tue Jan 09 18:27:10 1996
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From: [e-mail] (Geert Pirens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with a phonetap! - phone.txt [01/01]
Date: Sat, 06 Jan 1996 02:38:55 GMT
Organization: PING Belgium
Lines: 2
Message-ID: <4ckn5l$[e-mail]>
References: <42pjbb$[e-mail]>
NNTP-Posting-Host: dialup58.hasselt.eunet.be
X-Newsreader: Forte Free Agent 1.0.82





From Unknown Tue Jan 09 18:27:11 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!EU.net!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!fdn.fr!uunet!in2.uu.net!news.compuserve.com!news.production.compuserve.com!news
From: Dave'Doc'Reid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,uk.radio.amateur
Subject: DRCP ham radio kits on WWW
Date: 6 Jan 1996 04:10:37 GMT
Organization: D.R.Computer Products
Lines: 27
Message-ID: <4cksnt$ib0$[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:12561 rec.radio.amateur.misc:96535 uk.radio.amateur:9940

Hi all,

a new update to the pages of D.R.Computer products
radio related kits is now available on the WWW.

http://ourworld.compuserve.com/homepages/drcp

we have an Iambic Keyer on a 1 inch PCB....
and a morse tutor on a 1 inch PCB...
and details of other developments...

Have a wander around and enjoy....

If you want more detail - I can email direct text versions for
those of you without WWW access... just ask

73 de Dave'Doc'Reid
email [e-mail]
packet G0BZF @ GB7DEO (not for business)

cheers

--

Dave 'Doc'Reid Owner and proprieoter of D.R.Computer Products
Bringing radio amateurs everywhere into the digital age
Callsign G0BZF   GQRP # 3677   RSGB  (UK organiser of LY96BDX)


From Unknown Tue Jan 09 18:27:12 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: "C. J. Hawley Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Sat, 06 Jan 1996 10:45:08 -0600
Organization: University of Illinois, Urbana-Champaign
Lines: 37
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <4ccgnl$[e-mail]> <4ch6fi$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: antwerp-1.slip.uiuc.edu
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)

Gary Coffman wrote:

snip

> Upon reflection, I frankly don't fault the author at all. I think that
> it is the editors of QST who have committed a serious error of judgement
> here, and who have authorized payment of League funds for the privilege
> of printing what amounts to an *advertisement*. That's not the way it's
> supposed to work. The company is supposed to pay QST for carrying its
> ads. (I'm assuming QST paid the regular feature article rate for this ad.
> If they didn't pay, then I'm only upset by them misleading us that this
> is a real construction article rather than what amounts to a reprint of
> a kit assembly manual.)
>
> Gary

I agree with you (and others) completely. The issue here is with OUR publicati
on
QST and how we want it to be run. I think the authors are nice persons and are
 just
taking advantage of the free advertising.
It's interesting how many have changed the subject when they reply to this pos
ition
on QST and what we thought QST was about. I have gotten beat over the head wit
h
everything from "smatter...you too cheap to pay a few bucks for the three cent
s per
hour hard work of the authors?" to "lighten up...big deal...if you don't like
it
don't buy it" to "there are a lot of people out there who will gain all sorts
of
benefit from building this kit, and if you think you're so above it go write y
our
own code". Someone even wrote that the authors have been swamped with orders (
which
sounded like an endorsement of the decision to publish the article). Well, I'm
 not
surprised. Five full pages in the magazine is a lot of coverage.
Well, none of these arguments are the issue. There is nothing practical about
the
real issue, and nothing needs to be solved for me. This is about the concept o
f a
member publication of an organization run for the sake of the art. If no one i
s
interested in the art of amateur radio to write an article with no strings att
ached
for the sake of sharing the knowledge, then no one is interested. Period. I do
n't
think that the editors should approach that problem by changing the rules (I k
now
that I am assuming that I we agreed on some rules....maybe not).

Chuck, KE9UW


From Unknown Tue Jan 09 18:27:13 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Paul Erickson)
Newsgroups: rec.radio.amateur.homebrew
Subject: computer interface for qrp plus
Date: 6 Jan 96 12:10:43 GMT
Organization: ucsd usenet gateway
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I recently spoke with Bruce at Index labs and he said that he
had heard that someone had built an interface for the qrp plus.

Dose anyone know anything about this?

cheers, Paul
ve7cqk
email: [e-mail]



From Unknown Tue Jan 09 18:27:14 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!newsjunkie.ans.net!inet.d48.lilly.com!inet.d48.lilly.com!nntp
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Converting Cellular to 902MHZ band
Message-ID: <[e-mail]>
From: Michael Brown <[e-mail]>
Date: 6 Jan 96 15:26:09 EST
References: <4cf7kg$[e-mail]>
Distribution: world
Organization: Eli Lilly & Company, Inc.
Nntp-Posting-Host: cis069.d51.lilly.com
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=us-ascii
Lines: 10

A local ham told me just the other day that he took an old cell
phone apart, pulled out the final amplifier and is planning on
using it for 900MHz. I don't have the details, and we haven't
put in on the spectrum analyzer yet, but it should be able to
be done.

Michael Brown
KG9DW




From Unknown Tue Jan 09 18:27:15 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Profitting from QST articles (long)
Date: Sat, 06 Jan 96 15:29:43 PDT
Organization: Northwest Nexus Inc.
Lines: 26
Message-ID: <[e-mail]>
References: <4chf6s$[e-mail]> <4cjkod$[e-mail]>  <[e-mail]>
NNTP-Posting-Host: blv-pm2-ip29.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


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

> I wrote and had published in the September 1979 issue of Ham Radio
> Magazine an article titled "Split-band Speach Processor". I was pleased
> to have it be the lead article and be featured on the cover. The
> article ran eight pages and I was paid $350. On a time and materials
> basis, I probably made well under a dollar an hour. The article
> included complete schematics, PC board artwork and parts placement
> drawings as well as design equations. I paid a friend $100 to lay out
> the boards and tape the artwork.  This was in the days before word
> processors and auto-routers BTW. I offered no kits or PC boards.
>
> Shortly after publication, I began receiving requests for PC boards and
> I was forced to reply that I did not have a supply. I casuall mentioned
> this to another friend who allowed that he would put up the funds to
> have some made and we could sell them and split the profit(?). So off
> we went and ordered 100 sets of boards at a cost of a shade over $700.
>
Interesting story Wes, I would guess that some magazines are more ethical
than others.  I also notice that may companies put Copyright notices on
their PCBs, and I have adopted that practice.  I don't know how much
protection that would provide, but its worth a shot....

73 de KI7RH (Jay)



From Unknown Tue Jan 09 18:27:16 1996
Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: Jeff Hutchinson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Icom R-71A circuit board
Date: Sat, 06 Jan 1996 16:23:11 -0500
Organization: Marine Electronics Services
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: @pm8_18.digital.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)

I'm restoring a sick R-71A receiver, and need a logic board.  Anyone out
there with one for sale or swap?  Will buy a basket-case R-71 if the
logic board is okay.  Vy 73, from Jeff


From Unknown Tue Jan 09 18:27:17 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in1.uu.net!world!coopnews.coop.net!news.den.mmc.com!news.vf.mmc.com!ew0203!hbrown
From: [e-mail] (Harry H. Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low Noise Linear Power Supplies
Date: 6 Jan 1996 17:24:44 GMT
Organization: Sun Microsystems
Lines: 9
Distribution: world
Message-ID: <4cmb8s$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ew0203.resd.vf.ge.com

A friend of mine used to design phase locked oscillators for communications sa
tellites.
These oscillators operated in the 400 or 500 MHz range and used a very high Q
cavity.

 The power supply to the oscillator that they used was made by using a couple
of series zener diodes with a fet as the "load resistor". This provided the re
ference voltage to a current source that provided the power to the oscillator.
 The key was the zener diodes. The ones they used have very sharp knees and we
re made by TRW at the time. I'm not aware of TRW still being in the business b
ut other companies provide sharp knee zeners that may provide the characterist
ics needed. My friend said that the zeners had a very steep slope of voltage v
s current which resulted in a very stable reference source.

There are other parameters to consider obviously since at least one design of
a noise bridge back in the early 70's used a zener as the noise source.

73, Harry, W3IIT



From Unknown Tue Jan 09 18:27:18 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!slip3-3.acs.ohio-state.edu!user
From: [e-mail] (Ron Long)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with MC68HC705C8 Programming
Date: 6 Jan 1996 17:59:12 GMT
Organization: The Ohio State University
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip3-3.acs.ohio-state.edu

Hello,

I want to program a OTP (one time programmable) Motorola
microcontroller MC68HC705C8 using a circuit given in the
Motorola manual which transfers data from a 2764 eprom into
the controller.

The question is the data book is unclear about the programming
voltage (Vpp). At one place it says 16 V maximum but it never gives
a typical or 'correct' voltage? 12 Vdc? Is 13.8 Vdc ok?

Thanks for any help.

Ron, w8gus.


From Unknown Tue Jan 09 18:27:19 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!ohstpy.mps.ohio-state.edu!garland
From: [e-mail] (JIM GARLAND)
Newsgroups: rec.radio.amateur.homebrew
Subject: QST Antenna Tuner Kit-First Impressions
Message-ID: <1996Jan6.185503.8669@ohstpy>
Date: 6 Jan 96 18:55:03 -0500
Organization: The Ohio State University, Department of Physics
Lines: 45

Having started all the commotion about the QST automatic tuner article with my
posting several weeks ago, I decided to buy the "kit" and take a first-hand
look at the product. I haven't wired it yet, but thought I'd offer my first
impressions on the unassembled components and documentation, since there seems
to be a great deal of interest in the tuner. What arrived is, in fact, a
full-fledged kit, with an eleven page assembly manual that includes a parts
list, parts placement drawing, suggested front panel layout, and carefully
drawn sketches on wiring up the toroids. A schematic is included, as is a bloc
k
diagram and a front panel wiring diagram. The manual is nicely written with
step-by-step instructions that fall only slightly short of Heathkit quality.

Predictably, no information is given about the software, but it is noted that
future upgrades will ba available for about $10, with trade-in of the old
68HC11 chip.

The parts are packaged nicely, with the eight toroid cores comprising most of
the weight. All the components are off-the-shelf pieces, that one could buy at
Digikey or similar suppliers. Two SO239 connectors are also supplied.

My only quibble with the kit is the printed circuit board. The board itself is
of high quality. It is double-sided, with thru-plated holes, green
solder-masking, and silk-screened component outlines shown in white. My concer
n
about the board is that the large majority of the traces seem to be extremely
thin. I couldn't measure them, but I'd guess a maximum width of 10 mil, and
probably less, perhaps even 6-7 mil. (all the relay control lines are wired
this way.)  Further, the pad sizes seem too small
relative to the holes in the pad. I'm not an expert at PCB layout, but I'd
think that a pad should have a minimum of 10-15mil of metal around each hole.
The majority of holes on the board have significantly less metal than this. In
fact, a majority of the holes were drilled slightly off-center in the pads, so
that there is no metal at all on one side of the hole!

IMHO it is regretable that the board was laid out this way, since components a
re
quite widely spaced and significantly thicker traces could have been
specified. I'm worried that the slightest flexing of the board (as might occur
in mobile service) may break hairline traces. I'm also worried that pads may
come loose at soldering temperatues, since there is so little metal adhering t
o
the board. If you're thinking about buying the kit, you might want to keep
these points in mind. It's a shame, really, because a great deal of care and
thought went into putting the kit together.

More, when I have the kit up and running.

Jim W8ZR



From Unknown Tue Jan 09 18:27:20 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: Sun, 07 Jan 1996 05:34:29 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 88
Message-ID: <4cnm2u$[e-mail]>
References: <4ck2p5$[e-mail]> <4cmp0n$[e-mail]>
NNTP-Posting-Host: usr1ip12.azstarnet.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (W8JI  Tom) wrote:

>In article <4ck2p5$[e-mail]>, James Garland
><[e-mail]> writes:

>>That's a great idea, Jack, but I'm afraid you're not the first to think
>>of it. As I recall, there were several audio processors on the market
>>during the 70's which used the basic idea: mix an audio-derived DSB
>>signal up to an IF (usually 50-500KhZ), clip it, then mix it back to
>>audio. ETO sold one of these units, if I remember correctly, as did
>>VOMAX. I also recall reading a do-it-yourself article on the concept in
>>one of the ham mags -- probably Ham Radio.
>>Jim W8ZR
>>
>>

>Hi Jim,

>The Vomax was a split band audio processor which is superior to RF
>processing. I still use a modified VOMAX with my 751A.

>Wes N7WS had a nice article in some magazine years ago, it was good enough
>to be copied (hopefully he was compensated) and sold by two other
>companies.

I wish!

>I see Gary's point. If an unfiltered DSB signal is clipped and re-mixed to
>audio, it will have extra unnecessary distortion products in the output.
>But I have no feel for the level.

I posted on this before, but hadn't read Jack' s post
carefully enough to see that he was talking about a *DSB*
signal.  The Comdel approach that I mentioned was an *SSB*
processor.  As Gary and Tom note, there will probably be a
distortion penalty to pay.  You also have to be very careful
to have the clipping occur only in the clipping circuit, not
elsewhere where it is uncontrolled.

>Splitting into sub-bands, processing, filtering, and re-combining is
>always the best approach. As long as correct phase between signal channels
>is maintained. Hopefully Wes will show up, since he designed a system.

I'm here!

I agree, although, you must be very careful to minimize
lower frequency distortion ahead of the first band-splitting
filters.  Distortion products are harmonics and if the input
signal contains them, they can pass into one of the higher
frequency filters, where if they are small enough, they
remain unclipped.  Meanwhile, the higher amplitude, lower
frequency signal is clipped, ie. its amplitude is reduced.
Coming out of the second set of filters, the two signals are
combined and... oops; compared to the fundamental, the
harmonic amplitude has actually increased.  The distortion
has increased by the clipping ratio; exactly what we don't
want.  Of course, we usually analyze these things under
steady-state conditions.  With speech, this is much less of
a problem.

>73 Tom

73, Wes

Some references:

"R.F. Clippers for S.S.B." by William Sabin, W0IYH, QST,
July 1967.

"Ordinary and Processed Speech In S.S.B. Application" by
Harold Collins, W6JES, QST, Jan 1969.

"Speech Clipping in Single-sideband Equipment" by Walter
Schreuer, K1YZW, ham radio magazine, Feb 1971.

"Performance of RF SPeech Clippers" by Leslie Moxon, G6XN,
ham radio magazine, Nov 1972.

Letter to ham radio magazine, by L. R. Newsome, VK4LR,  May
1975, pp 75-76.

"Split-band Speech Processor" by Wes Stewart, N7WS, ham
radio magazine, Sept 1979.

Letter to ham radio magazine, by W. Schreuer, with response
by W. Stewart, N7WS, Feb, 1980,




From Unknown Tue Jan 09 18:27:22 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Lrware)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ham Gods and Spectrum Analyzers (Was interesting question...)
Date: 7 Jan 1996 06:52:18 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 20
Sender: [e-mail]
Message-ID: <4coc5i$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4chl02$[e-mail]> [e-mail] (Andy
Green) writes:
>Things I know:

<snip massive amount of information presented concisely>

> information posted by:
>Gary Coffman KE4ZV
>Destructive Testing Systems
>534 Shannon Way
>Lawrenceville, GA 30244
>[e-mail]

Bravo! Do we have an ex spectrum analyzer designer among us?
Concise discription of why a good spectrum analyzer is...

-Larry Ware
R&D Engineer
GTI Telecom
[e-mail]


From Unknown Tue Jan 09 18:27:22 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!newsfeed.direct.ca!usenet
From: duan klettke <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: INFO on Dumont 301-a oscilloscope
Date: 7 Jan 1996 07:19:06 GMT
Organization: Internet Direct
Lines: 5
Message-ID: <4cns5a$[e-mail]>
NNTP-Posting-Host: 204.174.242.31

I have aquired a Dumont type 301-A Oscilloscope (ser. 6X81).
If anyone has any info on this scope, ie. schematics,manual etc. I
would very much appreciate you contacting me.
Thank you.
Duan


From Unknown Tue Jan 09 18:27:24 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 7 Jan 1996 07:38:37 -0500
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In article <[e-mail]>, Jay
Wicklund <[e-mail]> writes:

>The difference between the 20A and the 20B seems to be that the 20B has a

>somewhat better spec on clamping resistance and slightly lower clamp
>volt.
>
>My book doesn't show the other two parts, but I would guess that the LA13

>is inbetween the LA10 and LA20.
>
>If anyone would like, I could fax a copy of this page of the book to you.
>
>73.....KI7RH (Jay)

I wonder if anyone looked at the voltage a MOV requires before the
resistance really drops a lot, and compared that to the current the device
you are protecting would be drawing at the same voltage. It's been a while
since I looked at them, but when I did they almost were worthless for
power line protection.

73 Tom



From Unknown Tue Jan 09 18:27:25 1996
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From: [e-mail] (Steve Clby)
Newsgroups: rec.radio.amateur.homebrew
Subject: E-V Microphone FS
Date: 7 Jan 1996 13:03:52 -0500
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For Sale:

ELECTRO-VOICE #664 Variable-D* Dynamic Cardioid Microphone,
Variable Impedance Wired HI-Z, with original box. Has boom
mount attachment (permanent) and includes adjustable boom
(Appears to have been made from an adj. desk lamp base).
Appears to be in VG-EX cond. Cable also included.

I don't know the value of this mic and would appreciate your
input or offer.

Thanks for your consideration,

Steve


From Unknown Tue Jan 09 18:27:26 1996
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From: [e-mail] (Steve Clby)
Newsgroups: rec.radio.amateur.homebrew
Subject: Power Supplies FS
Date: 7 Jan 1996 13:35:09 -0500
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For Sale:

(2) ELPAC OLV30-12 Power Supplies, 12v, 4.0A (Adj. 4v,6A.
to 28v, 1.7A.) With Remote Sensing, (Instructions/Spec. Sheet
Included)

Guaranteed Specs:

1. Line Regulation:     +/- .1%  Output For
                        +/- 10% Input Variation

2. Load Regulation:     +/- .1% Output for No Load
                              to Rated Load

3. Ripple:              .1% P-P Output For
                            No Load to Rated Load

4. Ambient Temperature: 0-55 degrees C

Input: 120vac or 240vac

I'm selling the (2) units together. One has been wired for
120VAC and is putting out 12V. The other unit appears to have
been worked on and the AC cord has been removed. It may or
may not work, so I'm selling it as is.  $25.00 plus shipping
for both.

Also available:

 Variac V10-G3/POWER SUPPLY in steel cabinet with whisper
fan and Simpson DC volt and amp. meters. Marked "General Radio"
on handwritten tag inside case.  115v. Input 10a. 50-60 ~
 I checked the output with a meter and it seems to range
from 1 or 2v. to approx. 30v. Dial is calibrated from 0 to
130. It appears to be set up as a battery charger or transformer
as it has (2) heavy output leads with battery style spring
clamps.    $75.00 plus shipping (heavy)

 Thanks for your consideration,

Steve


From Unknown Tue Jan 09 18:27:27 1996
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From: [e-mail] (Steve Clby)
Newsgroups: rec.radio.amateur.homebrew
Subject: Multi-Pin Connectors FS
Date: 7 Jan 1996 13:59:42 -0500
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For Sale:
I have picked up a number of military type multi-pin connector
kits (female) with the connector housing and separate container
of gold (plated?) pins. Ther are various manufacturers and some
kits carry part numbers like "Bendix CE-10-185002-202" Assembled
July, 1966.  Anyone have any interest in these?

Thanks,

Steve


From Unknown Tue Jan 09 18:27:28 1996
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From: [e-mail] (Garry Foster)
Subject: Re: QST Automatic Tuner Article
Message-ID: <177cc$[e-mail]>
Date: Sun, 07 Jan 1996 18:22:47 GMT
Reply-To: [e-mail]
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[e-mail] (Richard Karlquist) wrote:

>In article <[e-mail]>,
>Gary Coffman <[e-mail]> wrote:
>>
>>More interesting now would be a circuit that would yield both vector
>>magnitude and phase for the uP to work with. Then we could optimize
>>the network quickly for *best* match. Anyone have any candidate
>>circuits that could be retrofitted to the design?
>>
>>Gary

Due to all the intrest in the QST antenna tunner article I have
generated a list of related articles I have on file.  If any one has
any others not listed I'd like to hear about them and try to obtain a
copy.


        Electronics Dec 1951 "Automatic Impedance Matcher"  by Virgil True
This is a servo driven circuit that uses the Phase Magnitude detector
that was standard in commerical military applications for years to
come.

        Qst July 1952   "A Phase Detector for RF Transmission Lines" by Robert
Mezger  W2BLL    A description of the Phase detector with vector
diagrams ect.

        QST August 1952 "Automatic Tunning of the Antenna Coupler" by Walter
A. Knoop.  This is a stab of an Auto tunne for a link coupler for
ballanced lines. Uses a phase detector and addresses the problem of
the link keeping the circuit from exact reasonance. Serries capacitor
in serries with the Link. Inresting reading for those of you using
balanced feed.

        CQ December " 1952 "The True Matcher" by Capt. R. R. Hay USN W4LW
This is a description of a phase magnitude indicator.

        CQ July 1953    " Additional Notes on the True Matcher." by Capt R.R.
Hay Capt. USN W4LW

        CQ January 1954 "Problems in Automatic Antenna Tunner Design"  by Capt
R.R. Hay  USN W4LW.

        CQ June 1954    "The Automatic Match" by Capt R.R. Hay Capt. USN W4LW.
Capt Hay puts his Phase magnitude detector to work driving servos to
match his system.

        CQ Feb 1956     "RF Phase Sensing Unit and Impedance Magnitude
Indicator"   M.K. Brooks and W. Brooks

        QST Dec. 1956   "Automatic Antenna Tunning for the Amateur"  by Lois
Hutton W0BQF.  He did it right way back then.....Look Ma no
Transistors.....My words not his

        CQ Jan 1962     "Building and Using the Coax Phase Detector" by David
Geiser Wa2ANU.  Good article on building a phase detector principle.

        CQ August 1962  "How The Coax Phase Detector Works" by David T.
Geiser. A folowup article digging in to the theory of an earlier
constructon article.

        73 July 1979 "Tennamatic: An Auto-Tuning Mobile Antenna System" B.F.
Brown W6TWW   This isn't a tunner per say but resonants the Antenna.
Is still used on the popular screwdriver types of antennas however you
must move the coil to the proper band as it ignores the impedence.
Great article.

        QST April 1980          "A T-Network Semi-automatic Antenna Tunner" Bill
Imamura JA8GW      This is a VSWR only driven tunner.

        QST July 1980   "The Impedance Match Indicator" by David Geiser "
WA2ANU  Another tutorial on the phase and Magnitude detector with a
good construction article.

        QST October 1982 " Mobile Antenna Matching --Automatically!" Don
Johnson W6AAQ  This is a re write of the July 1979 "73" article. Also
both articles are in the book"40 +5  years of HF Mobileing" by Don
Johnson. Published by World Radio .

        CQ April 1987 "CQ Reviews the Icom AH-2 HF Mobile Antenna System" Lew
McCoy W1ICP  This is a review but includes the schamatic. Notice it is
Phase and Impedance driven. Very similar to the current QST article.
If anyone looks at this circuit I'd like thier opinion on the purpose
C165-167. Is this only so they can advertise it as a pie tunner?

        QST January 1996        "An Automatic Antenna Tunner: The AT-11"  by Dewayne
Kincaid WD8OYG   This is the first digitial based tunner article I
have on file. (Except for the review if the Icom AH-2) . It is also
the first construction article that witholds information on the
operation of the unit. It is also the first construction article that
gives the project a product type name the "AT-11"   Lots of firsts
here and not all of them good IMHO>





                                        Garry WB0NNO




From Unknown Tue Jan 09 18:27:31 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Garry Foster)
Subject: Re: QST Automatic Tuner Article
Message-ID: <177cc$[e-mail]>
Date: Sun, 07 Jan 1996 18:22:52 GMT
Reply-To: [e-mail]
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[e-mail] (Richard Karlquist) wrote:

>In article <[e-mail]>,
>Gary Coffman <[e-mail]> wrote:
>>
>>More interesting now would be a circuit that would yield both vector
>>magnitude and phase for the uP to work with. Then we could optimize
>>the network quickly for *best* match. Anyone have any candidate
>>circuits that could be retrofitted to the design?
>>
>>Gary

>There have been a handful of articles in ham publications over the
>years on automatic antenna tuners and most have used a standard
>design of a phase and magnitude indicator.  This standard design
>is very similar to wattmeter designs that involve passing the center
>conductor of a transmission line thru a big toroid to sense line
>current, then take the dot product of it with the line voltage
>(easily sensed with a capacitive voltage divider).  By a slight
>rearrangement of things you can instead get an indication of
>phase (capacitive or inductive) and magnitude (greater or less than
>z-zero).  The resulting device is sort of a cross between a wattmeter
>and a VSWR meter, in terms of constructional characteristics.
>Anyone have a non-obscure article citation that describes one of these?
>A dumb old analog control circuit using one of these
>phase/magnitude sensors can run rings around most VSWR only circuits,
>even if they use a secret digital algorithm.  I know of a commercial
>tuner that could lock up in less than 1/2 second to any matchable
>load, without presetting from a look up table.  Didn't even have
>a microprocessor either.  I don't understand all the excitement about
>the QST article.  I wouldn't want the design if it was free.


>Rick Karlquist N6RK
>[e-mail]

Well I have seen several servo tuners but never seen one that could
move very far in 1/2 second. Most took several seconds to turn a
rolller inductor thru a gear head motor. However they all did use a
phase magnitude detector.

I do have to say that I have a great deal of respect for the circuit
in this article as I haven't seen anyone else publish anything better.
And a few years ago QST published a servo driven VSWR driven circuit
that was just awfull.

Also the magnitude detectors usually try and determine if the load is
greater than or less than 50 ohms.

Several of the circuits in the ham publications over the years have
only used phase detectors which required you to manually get in the
band. The Ten a Matic for example. Other wise they will tune you to
the equivalent of a 1/2 wave or any other resonant length.

A good description of the phase detector is in  a couple of articles
by David Geiser Wa2anu CQ Aug 1962 and then in the July 1980 QST. In
the Qst article he also covers the magnitude(impedence)
detector(indicator).

In another message is a list of the related articles I have if any one
is intrested.

                                        Garry WB0NNO




From Unknown Tue Jan 09 18:27:32 1996
Path: news.epix.net!plum.epix.net!gmfoster
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Sun, 7 Jan 1996 21:15:05 -0500
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Snip.
 > antenna on the rear bumper. What's the big deal, haven't seen anyone
 > complain about Yaesu, Kenwood or Icom not giving their stuff away.....
 > --
 > John Wilcox / NS1Z
 > 44.118.6.4
 > [e-mail]
 > 204.117.6.48
 > [e-mail]
 >
 > ns1z @ kb1bsc.fn44rn.me.usa.noam
What was the last Yaesu, Kenwood or Icom project you saw as a lead howto
article. In fact what was the last article on one of these manfg.
products that wasn't a review or paid advertisment?

And you really should move the unit to the base of the antenna or as
close as you can get it.

                                                Garry WB0NNO


From Unknown Tue Jan 09 18:27:34 1996
Path: news.epix.net!plum.epix.net!gmfoster
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Sun, 7 Jan 1996 21:26:09 -0500
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Well Stated !

In fact all the ARRL rigs are now big comerical units from what I have
heard. More like a coastal station for ships at sea. The ARRL has all the
tools to do board design and maybe even fab. Why isn't this offered as
a service to the members for projects such as this tunner? Why aren't the
lab services in general more available to the membership or are they and
I'm just unaware of it?


                                        Garry WB0NNO


On Wed, 3 Jan 1996, James Griffith wrote:

 > In article <4c6es2$[e-mail]>, [e-mail] says...
 > >
 > >[e-mail] (James Griffith) wrote:
 > >
 > >>>QST is sold at most major news stands and magazine racks now. You
 > might
 > >>want to try that. The artical is not that big a deal. It's an
 > >>advertisment so its writer can make money. It would be difficult to
 > >>duplicate without buying their kit. QST is going same way Popular
 > >>Electroncs went years ago, selling kits with articles.
 > >
 > >Hello, Jim,
 > >
 > >I don't kwow if I would go *that* far.  First, ARRL doesn't sell the
 > >kits; the authors do.  From the feedback we have received from readers,
 > >most readers *prefer* construction articles that have kits.  And, in
 > most
 > >cases, even if a construction project has a kit, the builder can still
 > >dead-bug it, if he or she chooses.  This tuner article is almost an
 > >exception to the rule, in that it requires a part that is available only
 > >from the author.  However, the author will gladly sell the
 > >progrmammed IC only for those who want to locate all the other
 > >parts themselves. (I wonder if *anyone* will take him up on the
 > >offer; I want the kit! :-)  ).
 > >
 >  >
 > >>
 > >
 > >I don't mean to sound like a "wet blanket", and I don't know your age,
 > mine is 52. But, I remember the exciting time when, with almost nothing
 > at all, one could get on the air with something he or she built. Or, if
 > you were intrested in just building an electronic project from Ppopular
 > Electronics, you were able, because at the age of 12 or 13 you didn't
 > have the money to by that one part that could only be bought from that
 > special place, who ever or were ever it might be.
 >
 > Have you ever longed to build something electronic at the age of 12 or
 > so, and had no money, but the author gave you a way to do in in the
 > article, like the code for the chip, or the turns count and size of the
 > coil.
 >
 > I believe,(This is only me talking.) and I am a member of ARRL and you
 > have published 2 very popular articles I wrote, at least my fan mail said
 > so, that QST is no longer a member publication devoted to ham radio, FOR
 > THE LOVE OF IT, but has gone into business, targeting those people who
 > would buy more magazines, (Your on the news stand now.) books, and other
 > offers the ARRL has, and has geared it QST publication toward them.
 >
 > Who are those people, (Me talking again.) thay are people who never grew
 > up in ham radio scrounging a part or a who rig full of parts to get on
 > the air, and if the truth be known, computer have the interest of the
 > young people, not ham radio. I can talk any were in the world on internet
 > who needs a radio.
 >
 > Those are the people targeted by QST. We all see the QRP articales, about
 > the only rig that can be built any more, if one can find a variable
 > capacitor. Have you even seen a dealer advertise a line of variable
 > capacitors in QST or any were elce. I have been in hard electronic repair
 > for 35 years, and I can fix hundreds of things not made anymore, or will
 >  never be made again. Why, becasue it all gone to software, and QST won't
 >  publish it so we can use are new skills and try and program our EPROM or
 > processor chip, we have to buy it, just like Popular Electronics.
 >
 > When is the last time we saw a 75 watt Novice rig in QST built and
 > presented by the ARRL lab. Packet is the revolution for those with
 > interest in computers. I can use computers, and repair them, thank you. I
 > tried packet and sold it. My time is better spent on something that is
 > real time then waiting on the postman.
 >
 > I, and people like me, are no longer the interest of the ARRL, or QST. I
 > love ham radio. It has gotten me good jobs from the skills it has given
 > me. I have talked to lots of people. Years ago thay all built something,
 > today most do not even own a good soldering iron. QST know that. I, and
 > the 12 and 13 year olds are no longer the target, the kit builder, and
 > the buyer of new equipment is because there in no money in me and a 12
 >  year old. There never has been any money in me and my kind in ham radio
 > because we build from parts, which there is no money in.
 >
 > We are the ones that some QST articles have made fun of because we see a
 > good deal in a broken radio, and can fix it, or see the value in a pile
 > of junk that know one elce can recognize, and are no longer recongnized
 > by QST.
 >
 > That is why the missing chip code to the ATU article is importent. Not
 > because you can build the unit by odering the part, but because you can
 > not say, on the air, I programed the chip myself from and article in QST.
 >
 >
 >
 >


From Unknown Tue Jan 09 18:27:35 1996
Path: news.epix.net!peach.epix.net!gmfoster
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Sun, 7 Jan 1996 21:40:14 -0500
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On Fri, 5 Jan 1996, Jay Wicklund wrote:
Snip

>
> In any case, I have to agree with the idea that it should have been
> called a product review instead of construction - and QST is doing this
> far too often.  It isn't just software.  A few months ago they published
And if its aproduct review should the company be doing the review?

                                        Garry WB0NNO



Snip
> 73 de KI7RH (Jay)
>
>
>
>


From Unknown Tue Jan 09 18:27:36 1996
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: Sun, 07 Jan 96 22:52:27 GMT
Lines: 55
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References: <4ck2p5$[e-mail]> <4cmp0n$[e-mail]> <[e-mail]> <[e-mail]>
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First, thanks to everyone for their comments on this subject.  The
RF processor in my previous rig was very effective and I'm
looking for a way to build an inexpensive outboard replacement.
Criticisms of the technique that I described are exactly what is
needed.  I think it would be useful to explore the various points
that have been made in greater depth.

   [e-mail] (Gary Coffman) wrote:

>You know what AM sounds like under selective fading, well the same
>thing is possible here if the clipping of the upper and lower
>sidebands isn't precisely symmetrical in both the amplitude and
>frequency domains. The latter is what's different about DSB.
     <snip>
>My gut feel is that it's important to use a carrier as high in
>frequency as possible for modulating and demodulating the DSB signal
>so that the percentage bandwidth is minimized and possible
>asymmetries in the frequency domain are reduced.

This is the first thing to consider, because it relates specifically
to the decision of whether to use DSB.  As in the previous example,
let's say the carrier oscillator is 6 MHz.  The DSB passband for audio
frequencies out to 3 KHz will be 6 KHz.  Therefore, the passband is
0.1% of the frequency of operation.  If there are no tuned circuits
between the balanced modulator and the clipping diodes, will frequency
response irregularities due to non-symmetrical clipping really be a
consideration?  To go a step further, let's raise the carrier
oscillator to something around 30 MHz. Now the passband width is only
0.02% of the frequency.  Surely that would prevent this type of
problem?

Looking at this somewhat empirically, the RF processor in my previous
rig clipped the SSB signal at an IF frequency of 3.18 MHz.  Because it
was SSB, the passband width was approximately 3 KHz.  That means the
passband width was 0.094%, only slightly less than the 0.1% for the
DSB processor at 6 MHz.  If this percentage bandwidth can be
symmetrically clipped for SSB at 3.18 MHz, would you agree that non-
symmetrical clipping probably won't be a factor with DSB at 6 MHz,
assuming the circuitry is otherwise similar?

>Another potential problem is reciprocal mixing in the demodulator.
     <snip>
>The obvious solution to this problem is a lowpass filter between the
>clipper and the demodulator.
     <snip>
>A clean DSB clipper thus may need a filter of 34 db.

Assuming the worst-case scenario of 34 dB is correct, the second
harmonic products at 12 MHz are still a good distance away from the
fundamental.  Wouldn't something like a 7- or 9-element Chebyshev
low-pass filter provide this degree of rejection?

73,
Jack  WB3U


From Unknown Tue Jan 09 18:27:38 1996
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: Sun, 07 Jan 96 22:54:32 GMT
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   [e-mail] (Wes Stewart) wrote:

> ... you must be very careful to minimize lower frequency distortion
>ahead of the first band-splitting filters.  Distortion products are
>harmonics and if the input signal contains them, they can pass into
>one of the higher frequency filters, where if they are small enough,
>they remain unclipped.

   [e-mail] (W8JI  Tom) wrote:

>Splitting into sub-bands, processing, filtering, and re-combining is
>always the best approach. As long as correct phase between signal
>channels is maintained.

This points out some shortcomings in the split-band scheme that I
hadn't thought of.  I do have a few comments.

First, maintaining the correct phase at the output of each filter is
probably impossible because the shift will vary across each filter's
passband.  I'm not sure how significant this phase shift will be in
terms of the percieved quality of the recovered audio, but having been
in the audio business a number of years, it's a troublesome concept.
Multiple-band phase shift is one of the characteristics of graphic
equalizers said by many (including yours truly) to degrade their sound
quality.  This may not be a significant issue in this application,
but I'd be very interested in a critical listening test of the audio
quality of one of these processors (with the filters active but the
clipping turned off).  To clarify this a little, I'm not just referring
to the amplitude cancellation that takes place as a result of phase
shift, but also to the audible effects of the phase shift itself.

Second, the possibility that the split-band processor might increase
the overall percentage of harmonic distortion in the manner described
above can't be overlooked simply by virtue of a low-distortion
preamp/filter circuit. Most harmonic distortion encountered in audio
is produced in microphones and speakers, not in the electronics.  In
this application, THD of the microphone will be impacted in the same
manner as harmonic distortion produced in the input circuitry.

Again, I don't know just how significant this factor is.  In
double-blind A/B tests, it's been shown that listeners often cannot
identify harmonic distortion in music until it is above 5%.  Below
that level, most listeners detect a difference between the pure and
intentionally-distorted programming, but they fail to identify it as
distortion.  In many cases, they will describe a signal with 1% or 2%
THD as sounding louder than the original, but not as being distorted.
Given the fact that speech lacks the sustained tones found in music, I
suspect it is affected even less in terms of perceived distortion.

73,
Jack  WB3U


From Unknown Tue Jan 09 18:27:39 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!usenet.logical.net!news
From: [e-mail]
Subject: Re: Making PC boards from laser printer
Sender: [e-mail]
Message-ID: <[e-mail]>
Date: Sun, 7 Jan 1996 23:13:39 GMT
X-Nntp-Posting-Host: dialup087.colnny1.capital.net
Content-Type: TEXT/PLAIN; charset=US-ASCII
References: <4bd8a1$[e-mail]> <[e-mail]>  <4bv1to$[e-mail]>
Mime-Version: 1.0
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage
Lines: 5


I jumped in the group late and missed the original posting. Whats the story
about laser print / circuit boards. I have used Tek Film with fair results.
Please let me know... Ernie..



From Unknown Tue Jan 09 18:27:40 1996
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS. HP141T with 8552B IF UNIT.
Date: 7 Jan 1996 23:42:16 GMT
Organization: -.-. --.-     -.. -..-
Lines: 6
Message-ID: <4cploo$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

Asking $500+Sh.
 Works great and it is in very good condition.

Pieter Ibelings
AC4OP



From Unknown Tue Jan 09 18:27:41 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!newshost.convex.com!news.dfw.net!news
From: David Mclean <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Web Page with MODs, Calls lookup, Ham links, Swap page, and more!!
Date: 8 Jan 1996 00:34:53 GMT
Organization: Road Kill Cafe!
Lines: 17
Message-ID: <4cpord$[e-mail]>
NNTP-Posting-Host: dfw.dfw.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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Xref: news.epix.net rec.radio.amateur.misc:96612 rec.radio.amateur.antenna:18314 rec.radio.amateur.digital.misc:13531 rec.radio.amateur.equipment:23497 rec.radio.amateur.homebrew:12589 rec.radio.amateur.policy:32440 rec.radio.amateur.space:6094

I would like to welcome all of you to my web page. The address of my web
page is "http://www.dfw.net/~dmclean". I have many links that you will
like. Here is a list of things that I have on my Web page:
1. Swap Page
2. Mods page
3. QRZ call lookup
4. Repeters freqs.
5. Links to F.C.C, A.R.R.L, and many more.
Check it out. You will like it.
--
                                                    David Mclean
                                              From The World of Hamradio
                                                   KC5NNV is Clear!
_________________________________________________________________________
-------------------------------------------------------------------------




From Unknown Tue Jan 09 18:27:42 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!ames!waikato!comp.vuw.ac.nz!central.co.nz!usenet
From: [e-mail]@central.co.nz (Barry Lennox)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Eddystone SW radio won't work - Need help.
Date: 8 Jan 1996 07:12:18 GMT
Organization: Personal
Lines: 17
Message-ID: <4cqg4i$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: barryl.central.co.nz
X-Newsreader: WinVN 0.93.14

In article <[e-mail]>, [e-mail]
says...
>
>
>I have recently aquired an Eddystone EC-10 SW radio.
>It doesn't work.

 Snip

Can't speak for the Toronto area as it's a bit ouside my shopping area !

However, if you get really stuck I can provide a circuit diagram for this
set. They are good radios, given their age. E-Mail me with your postal
address

Barry Lennox



From Unknown Tue Jan 09 18:27:43 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!ames!waikato!comp.vuw.ac.nz!central.co.nz!usenet
From: [e-mail]@central.co.nz (Barry Lennox)
Newsgroups: rec.radio.amateur.homebrew
Subject: SDA 4213
Date: 8 Jan 1996 07:13:50 GMT
Organization: Personal
Lines: 4
Message-ID: <4cqg7e$[e-mail]>
NNTP-Posting-Host: barryl.central.co.nz
X-Newsreader: WinVN 0.93.14

Has anybody got any data on a SDA-4213 pre-scaler IC made by Siemens

TIA,  Barry Lennox



From Unknown Tue Jan 09 18:27:44 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with MC68HC705C8 Programming
Date: Mon, 8 Jan 1996 12:55:07 -0800
Organization: Call America Internet Services  [phone]
Lines: 27
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Hi Ron...Hey it has been some time since we talked.  I'll bet you are
laughing at some of my efforts with the old TRS80 model 100, but the fool
thing still works!!  Regarding the MC68HC705C8, you might look in QEX
starting at issue number 107 for Jan 1991.  After that issue there were
others in which contained terminals for RTTY, AMTOR were written up.  The
programming was difficult for those chips, three of which I still have
not programmed effectively, but therein might be a clue for further
investigation.  Cliff Buttschardt  W6HDO

On 6 Jan 1996, Ron Long wrote:

> Hello,
>
> I want to program a OTP (one time programmable) Motorola
> microcontroller MC68HC705C8 using a circuit given in the
> Motorola manual which transfers data from a 2764 eprom into
> the controller.
>
> The question is the data book is unclear about the programming
> voltage (Vpp). At one place it says 16 V maximum but it never gives
> a typical or 'correct' voltage? 12 Vdc? Is 13.8 Vdc ok?
>
> Thanks for any help.
>
> Ron, w8gus.
>
>


From Unknown Tue Jan 09 18:27:45 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!dsinc!newsfeed.pitt.edu!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Ham Gods and Spectrum Analyzers (Was interesting question...)
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <4coc5i$[e-mail]>
Date: Mon, 8 Jan 1996 14:50:12 GMT
Lines: 13

In article <4coc5i$[e-mail]> [e-mail] (Lrware) writes:
>
>Bravo! Do we have an ex spectrum analyzer designer among us?

No, just a spectrum analyzer user, and sometimes repairman.

Gary

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


From Unknown Tue Jan 09 18:27:47 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: OLD 20M HB SSB/CW XCVR - early 60s?
Message-ID: <[e-mail]>
Organization: Organization? Me?
Date: Mon, 8 Jan 1996 16:43:52 GMT
Lines: 13
Sender: [e-mail]

Somewhere in the 1960s (I believe) there was published a design article for
construction of a SSB transceiver. It was all solid state, was intended for
20 meters, was about 1/4 watt output power, and specifically was designed
to run from a 6 (not 12) volt power supply. It was about the size of a cigar
box as I recall, and the author had intended to use it in his Volkswagen
bug, hence the 6 volt power supply limitation. I'm trying to track down the
article with this limited information. If you recall seeing something like
that in one of your old magazines or handbooks, could you let me know the
reference, or even better yet make a copy of the article? I think it was
the first published design for a all solid-state transceiver for SSB, and
I'm interested in duplicating it.

73 Dave WB0GAZ [e-mail]


From Unknown Tue Jan 09 18:27:49 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr5ip27.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: Mon, 8 Jan 1996 17:14:21 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 81
Message-ID: <[e-mail]>
References: <4ck2p5$[e-mail]> <4cmp0n$[e-mail]> <[e-mail]> <4cs3ht$[e-mail]>
NNTP-Posting-Host: usr5ip27.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4cs3ht$[e-mail]> [e-mail] (Bill S
orsby) writes:
>From: [e-mail] (Bill Sorsby)
>Subject: Re: Question:  RF Speech Processing
>Date: 8 Jan 1996 21:49:49 GMT

[snip]

>I've still got a VOMAX which I used for years.  In the tests I ran with it I
>was never convinced that it accomplished nearly as much as was claimed for
>it.  I used it for whatever marginal benefit it might provide and because it
>didn't distort my signal too badly (although some people complained!)

As the designer of a unit  similar to the VOMAX, I feel compelled to respond.
The literature I have on VOMAX claims 10-12 dB improvement.  One might ask
what is meant by "improvement", to which I would respond, based on Schreuer's
February 1971, Ham Radio Magazine article: intelligibility gain. OK, what does

this mean, you ask. Good question. Difficult to answer.


>The concept of speech compression is a fascinating subject.  It is easy to
>compress a signal so that the average power is increased, but improving
>comprehension (the desired end result) is another matter; the two don't
>necessarily go together.

Well, it isn't easy to do it correctly:-) Increased average power and improved

readability are not necessarily mutually exclusive though. I normally dislike
anecdotal testimonials, but I don't know how to avoid them in this case, so a
couple of personal examples.

When I first tried my processor, I was using a 100W transceiver. I didn't own
a linear amplifier, but I had the loan of one. I ran a number of on-the-air
tests whereby I would ask the other op to compare signal strengths and
intelligibility. I would first use the 100W with no processing. I would then
turn on the amplifier (SB220) and get a report just to verify how much
signal strength change he reported. I would then tell the other guy I was
trying out this new audio filter design and I would like to know what he
thought. I would turn on the processor and TURN OFF the amp and ask for a
report. Almost invariably, the signal strength report was the same and the
comments would be something like "The audio has more punch" or "You sound a
little bassier" or "You're not quite so natural sounding", etc. I never got a
report that suggested that I had dropped power by 10 dB.

I serendipitously chanced upon another fellow, who was using my design, on one

of those old ten meter paths where the signal is S1 but Q5. I asked him to
turn off the processor so I could get a feel for how it sounded in the other
direction. When he did, he was GONE. I mean gone. There was nothing. He had to

turn it back on to tell me to go ahead. We did this several times in both
directions with the same result.

Again the disclaimer.  I do mostly weak signal VHF work and I have no lab data

to back this up, but I'm convinced, that a good processor, intelligently
operated, is equivalent to adding a linear amplifier.

>  In some instances compression can be
>counterproductive to comprehension or intelligibility.  What happens is that
>compression of mid-band speech frequencies (generally not critical to
>comprehension) can drown out some of the higher speech frequencies (which are

>critical to comprehension). I believe this to be one of the shortcomings with

>the VOMAX and the reason why the on-air tests I ran never gave a decisive
>advantage to the VOMAX.

I'm not clear on what you mean by this. Advantage over what? There was one
letter to Ham Radio Magazine from K3ND which discussed comparative tests
between the VOMAX and my design. Gale reported a preference for my design in
90% of the cases. Most of his respondents believed that the VOMAX frequency
response was too narrow. Perhaps this is the problem in your case. There is a
trend to narrower and narrower filters in modern radios. Coupling these with
further BW limiting in an outboard processor might cause problems.

>I've never had the occasion to use RF processing (other than simple ALC) so I

>can't provide a measure of comparison here.

>For what it's worth.


>Regards,
>Bill Sorsby, N5BU

73, Wes -- N7WS




From Unknown Tue Jan 09 18:27:50 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!warwick!news.herts.ac.uk!usenet
From: Michael Petzold <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Question: Neosid filters
Date: 8 Jan 1996 18:01:34 GMT
Organization: University of Hertfordshire
Lines: 20
Message-ID: <4crm5u$[e-mail]>
NNTP-Posting-Host: 147.197.202.5
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Hi there!

I've got a problem with so-called Neosid filters. I'm
constructing at the time a weather satellite receiver, and I
found a suitable description in "vhf communications", a British
journal. Unfortunately it is a German development, so some
country-specific components were seemingly used. In the
schematic there are two different adjustable inductors (with
core), and the author calls them Neosid filters. They have the
notations 'BV 5056' and 'BV 5061', respectively.
Does someone know where I can get those filters (?) in the *UK*
? Or, of like importance, does someone know what values these
devices have in order to replace them?

For suggestions or solutions, please e-mail to:

[e-mail]

Thank you!



From Unknown Tue Jan 09 18:27:51 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!convex!tonyp
From: [e-mail] (Tony J. Podrasky)
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematic of FQY Synthesizer
Date: 8 Jan 1996 18:03:39 GMT
Organization: CONVEX Computer Corporation, Richardson, TX USA
Lines: 18
Message-ID: <4crm9r$[e-mail]>
NNTP-Posting-Host: convex1.convex.com

GE

I need to build a frequency synthesizer that has an output to 100Mhz.

It seems to me that QST had one a year or two ago, but I give my
old issues away so I'm not sure.

Anyone know where I can get a schematic?

73,
WA2EAA - tony


--
 The Coyote's  | I'm the voice of all the Wildest West, the Patti of the Plain
s;
     Song      | I'm a wild Wagnerian opera of diabolic strains;
Ernest Thompson| I'm a roaring, ranting orchestra with lunatics becrammed;
  Seton, 1913  | I'm a vocalized tornado - I'm the shrieking of the damned!


From Unknown Tue Jan 09 18:27:52 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news.nic.surfnet.nl!tuegate.tue.nl!etprs!joopv
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Accurate Clock for Digital Circuits
Date: 8 Jan 1996 18:44:49 GMT
Organization: Eindhoven University of Technology, The Netherlands
Lines: 20
Message-ID: <4cron1$[e-mail]>
References: <4cjesa$[e-mail]>
NNTP-Posting-Host: etprs.phys.tue.nl
X-Newsreader: TIN [version 1.2 PL2]

CARDS User ([e-mail]) wrote:
> I am looking for a very accuarte clock (10 to 20 Mhz) to drive digital
> circuits.  The accuarcy should be roughly +/- 5 ppm at room temperatures.
> If possible the circuit should be buildable with common electronic parts.
> Please let me know if anyone has knowledge of an appropriate design.

> Thanks to all in advance.

> Mark R.

Mark,

There are TCXO's on the market (Temperature Compensated Crystal Oscillators)
in a DIL-14 house. A simpeler solution is to solder a PTC disc to a crystal
house. That way the xtal is stabilized at 60 degrees or so.

Siemens has appropriate PTC disks for this purpose.

Joop



From Unknown Tue Jan 09 18:27:53 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Ted Viens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bi-Directional Amplifiers
Date: 8 Jan 1996 19:51:30 GMT
Organization: Netcom
Lines: 45
Message-ID: <4crsk2$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-hou7-13.ix.netcom.com
X-NETCOM-Date: Mon Jan 08 11:51:30 AM PST 1996

In <[e-mail]> Jack
Mott <[e-mail]> writes:
>
>I have a question of the technical experts in this group, although the
>subbject matter is slightly off-topic for this newsgroup.  I have
heard
>that cable television systems will need bi-directional amplifiers in
order
>to support high-speed two-way communications by cable modems.  Is this
>correct?  Also, how would one design a bi-directional amplifier over a
>50-800 MHz frequency range (my guess as to what the cable spectrum
is)?
>
>At higher microwave frequencies, I would design a bi-directional
>amplifier using two conventional amplifiers tied together with
>ferromagnetic circulators.  However, this design approach really does
not
>work at lower frequencies (have you ever heard of a circulator
covering
>50 to 800 MHz?).
>
>If you post a response, please also send e-mail.
>
>Charles Mott
>
>
>
>
It is not as complicated as some would imagine.  The amplifiers are not
truly hybrid bidirectional.  A split system is used with diplexers at
each side of the amplifiers.  The most commom split is the sub split.
50-Max in the forward direction and 5-45 in the reverse direction.
There are also two accepted standards in mid split systems.  One is
split at around 120 mHz and the other at around 250 mHz.  These systems
are mostly used in private campus situations where much of the
bandwidth is used for telephony, networks and other forms of truly
bidirectional communications.

Currently, only about 10 percent of the cable systems in the US have
return signals and those that don't are very reluctant to upgrade.  The
current Dog and Pony shows about widespread high speed interactive
cable services are dancing on thin ice...
--
Bye...  Ted..
Deep in the Heart of the Armpits of Houston, Texas...


From Unknown Tue Jan 09 18:27:54 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Antenna Tuner Kit-First Impressions
Date: 8 Jan 1996 20:07:56 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 37
Sender: [e-mail]
Message-ID: <4csf5c$[e-mail]>
References: <1996Jan6.185503.8669@ohstpy>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <1996Jan6.185503.8669@ohstpy>,
[e-mail] (JIM GARLAND) writes:

>My only quibble with the kit is the printed circuit board. The board
itself
>is
>of high quality. It is double-sided, with thru-plated holes, green
>solder-masking, and silk-screened component outlines shown in white. My
>concern
>about the board is that the large majority of the traces seem to be
extremely
>thin. I couldn't measure them, but I'd guess a maximum width of 10 mil,
and
>probably less, perhaps even 6-7 mil. (all the relay control lines are
wired
>this way.)  Further, the pad sizes seem too small
>relative to the holes in the pad. I'm not an expert at PCB layout, but
I'd
>think that a pad should have a minimum of 10-15mil of metal around each
hole.
>The majority of holes on the board have significantly less metal than
this.
>In
>fact, a majority of the holes were drilled slightly off-center in the
pads,
>so
>that there is no metal at all on one side of the hole!
>
>

Hi Jim, This sounds like the boards I get from out of house layout shops
that never work with RF. That's too bad. Maybe you could point that out to
the kit supplier, because your observations illustrate a big problem.
Somewhere I heard the rhyme short and thick does the trick. I assume that
meant RF traces.

73 Tom


From Unknown Tue Jan 09 18:27:55 1996
Path: news.epix.net!news.sprintlink.net!service-2.agate.net!usenet
From: John Wilcox/NS1Z <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Antenna Tuner Kit-First Impressions
Date: 8 Jan 1996 21:14:37 GMT
Organization: Agate Internet Services (AIS)
Lines: 19
Message-ID: <4cs1fu$[e-mail]>
References: <1996Jan6.185503.8669@ohstpy>
NNTP-Posting-Host: ns1z.sdi.agate.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Well, I built the kit and was very happy with it. I had no problems with
solder connections. The traces are fine (as in thin!) but seem to work
for my setup. I run the tuner under my ICOM IC-706 in my old S-15 Jimmy
and have had it in there for a few weeks now with not one problem. Time
heals all wounds and, in the case of the tuner, may open some... I have
had some correspondence with Dwayne and expect if a problem were to
develeop I could count on him to provide any assistance possible. I would
not only built another (if I needed it) but have heartily recommended it
to my friends locally. It sure beats the old MFJs!
--
John Wilcox / NS1Z
INTERNET :204.117.6.48
          [e-mail]
Work     :[e-mail]
TCP/IP   :44.118.6.4
          [e-mail]
AX-25    :[e-mail]




From Unknown Tue Jan 09 18:27:56 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!in2.uu.net!daver!UB.com!kaiwan.kaiwan.com!not-for-mail
From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Using HP8690 with HP8410 Network Analyzer ???
Date: 8 Jan 1996 21:20:26 -0800
Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338)
Lines: 21
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <4c1moh$[e-mail]> <4c22uj$[e-mail]>  <[e-mail]> <[e-mail]>
NNTP-Posting-Host: kaiwan009.kaiwan.com
Xref: news.epix.net rec.radio.amateur.homebrew:12602 rec.radio.amateur.equipment:23530

Sorry but I couldn't help.  Enjoy.


In article <[e-mail]>,
Jay Wicklund <[e-mail]> wrote:
>
> Have you tried HP.  I've purchased photocopies of old HP gear direct from
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Gee, I guess it will be real portable if you fold photocopy of 8620C
and put it in your shirt pocket.

> HP.  It's not cheap, but it is reasonable.  I don't have the number
> handy, but if you have trouble finding it email me, and I'll look it up.
> HP also has a web site that probably has phone numbers.
>

73,

---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'


From Unknown Tue Jan 09 18:27:58 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Question:  RF Speech Processing
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ck2p5$[e-mail]> <4cmp0n$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Date: Tue, 9 Jan 1996 16:10:03 GMT
Lines: 87

In article <[e-mail]> [e-mail] (Wes Stewart) w
rites:
>In article <[e-mail]> [e-mail] (Gary
Coffman) writes:
>>Ok, here's the problem. When you go to demodulate DSB back to
>>audio, the output is the vector sum of *both* sidebands with the
>>reintroduced carrier. You know what AM sounds like under selective
>>fading, well the same thing is possible here if the clipping of
>>the upper and lower sidebands isn't precisely symmetrical in both
>>the amplitude and frequency domains. The latter is what's different
>>about DSB. The sidebands are *mirror* images in the frequency domain,
>>so the clipping also has to be mirror imaged in the frequency domain.
>>That's not necessary with SSB.
>
>I have this crazy way of looking at things sometimes. I just said to myself,
>"Self, if you *wanted* to clip each sideband in this DSB signal independently
,
>what is the likelyhood that you could do it with a simple clipping
>circuit?" And I answered, "Beats me :-)"

Well, I don't know of any deliberate simple controlled way to do it either,
but what I'm talking about is unintentional and undesired behavior. In
broadcast we call it incidental phase modulation, and it's the result of
sending the signal through a somewhat non-linear system. The phase shift
induced in the two sidebands is different, because they are on different
frequencies, and varies with signal level. When they recombine in the
demodulator, their vector sum is different from the input signal too.
Through a system that deliberately operates non-linearly, the effect should
be much greater.

>>Depending on how the clipper is implemented, there can be considerable
>>differences induced in the phase/amplitude envelopes of one sideband and
>>its mirror image. Those differences will show up as in-band distortion
>>products. I don't have a feel for how great a problem this may be, but
>>I'm sure it is a problem (it is for AM broadcast transmitters using
>>compression), and there's no way to simply filter out these components.
>>My gut feel is that it's important to use a carrier as high in frequency
>>as possible for modulating and demodulating the DSB signal so that
>>the percentage bandwidth is minimized and possible asymmetries in
>>the frequency domain are reduced.

>>Another potential problem is reciprocal mixing in the demodulator.
>>The clipped sidebands will generate a *pair* of harmonics for each
>>audio generated product. To take the steady state example you pose,
>>the LSB will have a harmonic at 11.998 MHz while the USB will have
>>a harmonic at 12.002 MHz. Those two can *also* mix in the demodulator
>>yielding a difference product of 4 kHz which will be in the output
>>audio passband. Now that particular product is high enough to be
>>audio filtered in the output, but consider if there is a 500 Hz
>>component present in the input audio, its product will fall on
>>2 kHz in the output, and that's in the speech band. The obvious
>>solution to this problem is a lowpass filter between the clipper
>>and the demodulator.  But that lowpass filter has to be pretty
>>good to eliminate sensible products in the output. The lowpass
>>in a SSB clipper doesn't have to be quite as good since it doesn't
>>have to deal with paired products, IE there are only half as many
>>potential mixing products that can fall in the speech bandwidth
>>of the output with SSB *and* they are unrelated in phase, so
>>there's a potential for at least 6 db worse distortion products
>>out of a DSB clipper than a SSB clipper.
>
>I think it's too late to use a low-pass after the clipper. The intermod
>products can (will) be generated in the clipper.  After all, it's a
>highly non-linear device, perfectly suited for mixing. For example:
>
>Two audio tones, 500 and 1000 Hz applied to the balanced mixer along with
>a 6 MHz carrier. Output is 6 MHz (suppressed), 5.999, 5.9995, 6.0005 and
>6.001 MHz. Assume an USB filter.  Output is now 6.0005 and 6.001 MHz.
>Clip the hell out of it and get 6.0005, 6.001, 12.001, 12.002, 18.0015,
>18.003... Also, get (12.002-6.0005 = 6.0015) and (18.003-12.001 = 6.002)
>which both fall in the passband of the following LPF and BPF. It might be
>argued that if the clipping is perfectly symmetrical, there won't be a 12.001

>and 12.002, but (18.0015-6.0005 = 12.001) and (18.003-6.001 = 12.002) so ther
e
>they are. The split-band approach doesn't suffer this particular problem.

I agree with this, of course, but  I think this high order multiple
mix will be of considerably lower amplitude than the straight products
the filter would remove. You'd need some sort of circulating tank to
keep the base products around to remix with each other to form tertiary
products sensible to the demodulator. I don't think most clipper circuits
have enough tank to do that to any significant degree, but perhaps the
very filter I'm suggesting might supply that tank.

Gary

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


From [e-mail] Fri Jan 12 14:12:23 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 900 MHz Security
Date: 5 Jan 1996 19:43:32 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 24
Message-ID: <4cjv14$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <[e-mail]>,
Jack Mott  <[e-mail]> wrote:
>This posting is off-subject for this newsgroup, but I wanted access to
>the technical knowledge available here.  I have a 900 MHz digital
>cordless phone (ATT 9100), and I am interested in how secure this type of
>phone is with respect to over-the-air eavesdropping.  Please give a
>specific, technical answer addressing issues such as RF modulation and
>digital encoding.  If you post a response, please also send e-mail.

The ATT 9100 uses wideband FM, modulated with the CVSD data produced
by a Motorola MC3418.  I suppose someone could build a receiver
or tweak another 9100 to eavesdrop, but, as far as I can tell, this
is impractical enough to be of little concern.

Certainly it is much more secure than a conventional analog FM
phone, and even much more secure than a frequency-inversion
scrambled phone.  It isn't encrypted, but I would say it is
essentially secure.  I'm not a security expert, though ;-)


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


From [e-mail] Fri Jan 12 14:12:25 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!mr.net!news.mr.net!inet-serv.com!n0jcf.com!not-for-mail
From: [e-mail] (Chris Elmquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 900 MHz Security
Date: 11 Jan 1996 13:31:34 -0600
Organization: The Basement of N0JCF
Lines: 52
Message-ID: <4d3oim$[e-mail]>
References: <[e-mail]> <4cjv14$[e-mail]>
NNTP-Posting-Host: n0jcf.com

In article <4cjv14$[e-mail]>,
Dana Myers <[e-mail]> wrote:
>In article <[e-mail]>,
>Jack Mott  <[e-mail]> wrote:
>>This posting is off-subject for this newsgroup, but I wanted access to
>>the technical knowledge available here.  I have a 900 MHz digital
>>cordless phone (ATT 9100), and I am interested in how secure this type of
>>phone is with respect to over-the-air eavesdropping.  Please give a
>>specific, technical answer addressing issues such as RF modulation and
>>digital encoding.  If you post a response, please also send e-mail.
>
>The ATT 9100 uses wideband FM, modulated with the CVSD data produced
>by a Motorola MC3418.  I suppose someone could build a receiver
>or tweak another 9100 to eavesdrop, but, as far as I can tell, this
>is impractical enough to be of little concern.
>
>Certainly it is much more secure than a conventional analog FM
>phone, and even much more secure than a frequency-inversion
>scrambled phone.  It isn't encrypted, but I would say it is
>essentially secure.  I'm not a security expert, though ;-)
>

However-- my Tropez 900DL (of which the ATT9100 is a clone) transmits
a fairly powerful "image" in the clear on roughly 435 MHz.  I discovered
this about a year ago and made a posting or two about it.  I even
contacted Tropez and had a dialog going with someone (a ham even) in
their engineering group.  He promised to look into it and get back
to me...  well, surprise... no response.  I probably could start
pestering again but currently it's not bothering me too much.  I'm
down on 432 where I don't hear it.  OSCAR ops would be another story.

I first noticed it as a periodic chirp...  and was annoyed enough to
strap the R7000 onto my belt :-) and go sniffing around the house
looking for it.  It was hottest right at the handset... and went
away if the handset was placed into the base.  Turns out the periodic
chirp is the handset pinging the base checking signal integrity or
whatever.  So, whenever the handset was off the base... like, sitting
on the coffee table... it was making bad noises on 435 MHz.

I then placed a call with the Tropez and tuned around where the chirps
where heard on 435...  sure enough-- I could hear both the incoming
and outgoing telephone audio (somewhat garbled but still easy to copy)
in the clear.

Not sure if every unit does it-- but a friend checked his and found
the same behavior.  Your mileage may vary.

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


From [e-mail] Fri Jan 12 14:12:26 1996
Path: news.epix.net!news.sprintlink.net!bristlecone.together.net!sequoia!fflynn
From: [e-mail] (Francis Flynn)
Newsgroups: rec.radio.amateur.homebrew
Subject: Amidon?
Date: 11 Jan 1996 15:53:39 GMT
Organization: TGF Internet Services
Lines: 13
Message-ID: <4d3bq3$[e-mail]>
NNTP-Posting-Host: sequoia.together.net
X-Newsreader: TIN [version 1.2 PL2]

Does anyone have a current address and phone number for Amidon Associates?

The phone number I have is 213 763 5770, it's disconnnected.  Directory
assistance was no help either.

If they are gone, does anyone have a good source of toroids?

TIA 72/73

--
http://together.net/~fflynn
Francis Flynn, [e-mail]
ARS:KM1Z


From [e-mail] Fri Jan 12 14:12:27 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!ip201.msp.primenet.com!user
From: [e-mail] (Greg Putrich)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amidon?
Date: 11 Jan 1996 17:56:01 -0700
Organization: Primenet Services for the Internet
Lines: 27
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <4d3bq3$[e-mail]>
X-Posted-By: ip201.msp.primenet.com

In article <4d3bq3$[e-mail]>, [e-mail]
(Francis Flynn) wrote:

> Does anyone have a current address and phone number for Amidon Associates?
>
> The phone number I have is 213 763 5770, it's disconnnected.  Directory
> assistance was no help either.
>
> If they are gone, does anyone have a good source of toroids?
>
> TIA 72/73
>
> --
> http://together.net/~fflynn
> Francis Flynn, [e-mail]
> ARS:KM1Z

Try:
PO Box 25867
Santa Ana, CA 92799
714-850-4660

------------------------------------------------------------------
Greg Putrich /  [e-mail]                            [II]

PGP-Key 27E97EBD = 62 0E B9 A2 45 D2 64 AC 8A B4 6D 9D 5B 23 90 1F
So little to do, so much time.


From [e-mail] Fri Jan 12 14:12:28 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.netzone.com!usenet
From: "Brian C. Dolan" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: BFO Project Questions ?????
Date: 11 Jan 1996 02:13:18 GMT
Organization: NetZone, Inc.  (602) 991-4NET
Lines: 41
Message-ID: <4d1rnv$[e-mail]>
NNTP-Posting-Host: p9.netwest.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

 I recently downloaded a small schematic for a BFO synthesizer add-on
 for SW receivers, that I found on a QRP related site. Within the brief
 text associated with the schematic, it states:

     "The heart of this project is a 455 kHz IF transformer: go
      to your closest junked broadcast radio receiver and steal one
      from there."

 Not knowing what a "455 kHz IF transformer" is, and being an
 inquisitive guy, I pried open the nearest cheapo AM radio and found
 some things I recognized, and some I didn't. Process of elimination
 led me to rule out the resistors, capacitors, coils (chokes?) and
 transistors. This left the metal "cubes" (7 in this case),each with a
 hole in the top. In the hole is something with a flatbladed
 screwdriver slot in it. Is this an IF transformer? If it is, can
 someone briefly explain what it does? Additionally, each one has a
 different color in it; what does the color signify?  (...maybe the 455
 kHz aspect ???)

 Later in the text, it states:

      "Adjust the transformer slug until it resonates at 455 kHz,
       which can be accomplished using a receiver or GDO. AS you tune
       the slug (using the receiver) you should hear the heterodyne
       note of the BFO lowering in pitch until it eventually zero-
       beats."

 This section left me scrathing my head. I assume it has something to
 do with those screwdriver slots, but I have no idea what it's trying
 to get me to do. How would I use a receiver to do this? What is a GDO?
 What  is "zero-beats"?

 Answers to the above questions, as well as any general advice would be
 greatly appreciated.

 Thanks in advance for helping a new ham,

 Brian
 KC7JRT




From [e-mail] Fri Jan 12 14:12:30 1996
From: [e-mail] (David Covert)
Subject: DC/AC (Inverter) Schematic?
Date: 11 Jan 96 17:36:36 -0800
Message-ID: <[e-mail]>
Path: news.epix.net!news.sprintlink.net!news.msn.com!msn.com
Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (msn.com)
Lines: 14


I am looking for schematics for a high amp DC/AC converter to use in
the field.
It should take 12VDC in and produce 120VAC 60Hz out at 1600 watts.

I realize the best way to do this is to have a design with a single
'signal' card
and multiple 'driver' cards. Each 'driver' card could procude 100W
and take it's
60Hz from a common source.

Anybody have an expandable design like this?

Dave Covert, KB5GOG


From [e-mail] Fri Jan 12 14:12:31 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!calweb!calweb!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC/AC (Inverter) Schematic?
Date: 12 Jan 1996 00:10:45 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 7
Message-ID: <4d48u5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sac2-67.calweb.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)

Dave I beleive the way its done these days is to us an DC to AC
converter operating at a frequency such as 50 KHz. Convert this to DC
and then switch the DC to generate the AC at the desired frequency.
This uses smaller transformers that going directly to 60 Hz or
whatever.
Bill K7NOM



From [e-mail] Fri Jan 12 14:12:32 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Design for a 1W PA for 1296MHz
Date: Thu, 11 Jan 1996 12:26:41 -0800
Organization: American Radio Relay League
Lines: 20
Message-ID: <[e-mail]>
References: <4cg887$[e-mail]>
NNTP-Posting-Host: zlau.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)

Danie Brynard wrote:

> I am looking for a design or references to a design for a PA of
> about 1W for my 1296MHz transverter.

Tough power level.  Cheap plastic case devices only seem to do
500 to 600 mW output.  Most people seem to settle for that and
run this into a surplus GaAs FET or expensive hybrid module to
get 4 to 10 watts output. The 1995 Microwave Update Proceedings
(ARRL #5366) has a +28 dBm design by AA5C using the Siemans CLY-5.

Many GaAs FETs will work just fine lower in frequency, but
the impedance matched ones never seem to tune up the same
way.  No problem for the "real experimenter," make sufficiently
long 50 ohm input/output lines and tune till it works!

Of course, the M67715 hybrid will easily put out a watt linear,
but I don't think this is what you want.

Zack KH6CP/1


From [e-mail] Fri Jan 12 14:12:33 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!Germany.EU.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Funky bias setup in VHF linear amps?
Date: 9 Jan 1996 06:47:05 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 24
Sender: [e-mail]
Message-ID: <4ctkjp$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Jim,
In article <[e-mail]>, [e-mail] (James D. Cronin)
writes:
>The schematic for a Mirage 2-meter linear amp shows a bias arrangement
>that looks peculiar.
>There is the usual rectifier diode from transistor base to ground
>with a fixed resistor and trimmer potentiometer in parallel.  This part
>looks normal.
>What was odd was the bias supply:  Instead of being fed by a DC voltage
>it was connected to the transistors collector through (here's the wierd
>part) a series resistor, capacitor and choke.

Don't depend on the schematic to be absolutely correct. What Mirage amp is
it? I'll look at one and tell you how the circuit works.

73 Tom


>
>How is this supposed to work?  Are they siphoning off some of the output
>signal and letting the parallel diode rectify it?
>
>73..Jim  N2VNO



From [e-mail] Fri Jan 12 14:12:34 1996
Date: 10 Jan 1996 16:53:38 EDT
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!istar.net!infoshare!whome!gts!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
References: <[e-mail]>
Subject: Re: Ham Gods and Spectrum Analyzers (Was interesti
Lines: 22


> In article <4coc5i$[e-mail]> [e-mail] (Lrware) writes
:
>>Bravo! Do we have an ex spectrum analyzer designer among us?
>
> No, just a spectrum analyzer user, and sometimes repairman.
>
> Gary
>
> Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary


Gary...Just wondering if you are getting your e-mail ?
I sent you 2 messages within the past few weeks.
Zack Lau tells me that you were messing with a 222 MHz TX strip design.
I'm working on something similar...wondering if you care to share
info ?

Thanks..Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]


From [e-mail] Fri Jan 12 14:12:35 1996
Path: news.epix.net!news.sprintlink.net!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!unixg.ubc.ca!rover.ucs.ualberta.ca!cancer
From: [e-mail] (Gary Burchett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help with MC68HC705C8 Programming
Date: Tue, 09 Jan 96 16:56:31 GMT
Organization: University of Alberta
Lines: 31
Message-ID: <4cu2oa$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: cancer.psych.ualberta.ca
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <[e-mail]>,
   [e-mail] (Ron Long) wrote:
>Hello,
>
>I want to program a OTP (one time programmable) Motorola
>microcontroller MC68HC705C8 using a circuit given in the
>Motorola manual which transfers data from a 2764 eprom into
>the controller.
>
>The question is the data book is unclear about the programming
>voltage (Vpp). At one place it says 16 V maximum but it never gives
>a typical or 'correct' voltage? 12 Vdc? Is 13.8 Vdc ok?
>
>Thanks for any help.
>
>Ron, w8gus.


    You are right, I could not find that spec in the data book, either.
However, another source is the Technical Documentation, available on the
Web at http://design-net.com/csic/Tech_data.html   , one of Motorola's many
resources.  You have to register, which is not much of a chore.  The
documents are in PDF format, so you need to get the Acrobat reader from the
Adobe site.  There is a link at Motorola.  Make sure you get version 2.1 .

    The spec you need is :  @Vdd = 5 volts and Vss = 0 volts, Vpp = 14.5
volts min. , 14.75 volts typ. , and 15.0 volts max.  Thes figures are from
the electrical specifications section.  The document is also much more
descriptive of the various features of the processor.

Regards, Gary  VE6BBD


From [e-mail] Fri Jan 12 14:12:36 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Help With MOV's
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <4coesd$[e-mail]>
Date: Wed, 10 Jan 1996 15:41:50 GMT
Lines: 29

In article <4coesd$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>I wonder if anyone looked at the voltage a MOV requires before the
>resistance really drops a lot, and compared that to the current the device
>you are protecting would be drawing at the same voltage. It's been a while
>since I looked at them, but when I did they almost were worthless for
>power line protection.

Typically a MOV will be in hard conduction at 150% to 200% of its
rated working voltage, IE for a V130 that would be 195 to 260 volts.
It'll reach hard conduction a few nanoseconds after a transient reaches
that value, and remain so until the transient decays (up to the peak
joule rating of the device). Now assuming the PS being protected has
a dV/dt longer than a few nanoseconds, the transient will be safely
clamped before damaging voltage can pass through.

Remember a MOV isn't intended to be an overvoltage protector,
it's a *transient* surge protector. It won't protect a PS if
the line voltage rises to 140 volts for a sustained time, but
it will keep transient peaks below values that could punch
a junction or an electrolytic cap in the supply. (It is assumed
that a good PS design will use parts rated for peaks at least
150% to 200% of their planned sustained voltage.)

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


From [e-mail] Fri Jan 12 14:12:37 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 12 Jan 1996 05:26:28 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 43
Sender: [e-mail]
Message-ID: <4d5d0k$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Gary,
You wrote:
>Typically a MOV will be in hard conduction at 150% to 200% of its
>rated working voltage, IE for a V130 that would be 195 to 260 volts.
>It'll reach hard conduction a few nanoseconds after a transient reaches
>that value, and remain so until the transient decays (up to the peak>
>joule rating of the device).

Could you please give me an example of  what the "hard conduction"
resistance is?

What is the "on" resistance at say...300 volts peak for a MOV that will
safely opeate on a normal 120 volt power line (say 180 volt peaks). Do you
have the exact specs?

The last time I looked at the data from manufacturers of MOV's, they were
about worthless! Transformers would have been into saturation way before
the MOV conducted, and the transformer's saturated impedance would have
been several times lower than even a very large MOV's "on" resistance.
Maybe that has changed in the past few years.

Do you have data that indicates a MOV that can protect a transformer
operated supply? I understand MOV's help on line operated devices without
a transformer (they are better than nothing), but what about if a
transforer is used?

73 Tom


 Now assuming the PS being protected has
a dV/dt longer than a few nanoseconds, the transient will be safely
clamped before damaging voltage can pass through.

Remember a MOV isn't intended to be an overvoltage protector,
it's a *transient* surge protector. It won't protect a PS if
the line voltage rises to 140 volts for a sustained time, but
it will keep transient peaks below values that could punch
a junction or an electrolytic cap in the supply. (It is assumed
that a good PS design will use parts rated for peaks at least
150% to 200% of their planned sustained voltage.)

Gary
--


From [e-mail] Fri Jan 12 14:12:38 1996
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!news.uoregon.edu!psgrain!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!newspeak.ultratech.net!worldlinx.com!news.worldlinx.com!news
From: [e-mail] (Eric Vincent)
Newsgroups: rec.radio.amateur.homebrew
Subject: How make a (T/R Swich) ???
Date: 10 Jan 1996 04:53:49 GMT
Organization: Personnel
Lines: 7
Message-ID: <4cvgot$[e-mail]>
NNTP-Posting-Host: 204.101.89.39
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

I have a TH-78A, I want to drive a T/R Swich with my radio and I don't
have any idea to make that.

Please help me!!!

Thanks, Eric VE2-VXT     ([e-mail])



From [e-mail] Fri Jan 12 14:12:39 1996
From: [e-mail] (Glenn Schultz)
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.corpcomm.net!news.uoregon.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsfeed.internetmci.com!mr.net!news.mr.net!medtronic.com!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood on internet?
Message-ID: <[e-mail]>
Date: Tue, 09 Jan 1996 20:35:45 -0100
X-FTN-To: [e-mail]
Lines: 6

Try their dial-up BBS at: 1-310-761-8284
Good Luck!
Glenn
[e-mail] [44.94.248.210]




From [e-mail] Fri Jan 12 14:12:40 1996
Path: news.epix.net!uunet!in2.uu.net!in-news.erinet.com!bug.rahul.net!a2i!sierra.net!squaw-d121.sierra.net!user
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Low Noise Linear Power Supplies
Date: Wed, 03 Jan 1996 13:56:49 -0800
Organization: Engineered Solutions
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: squaw-d121.sierra.net

Recent postings about the 723 et al looking for low noise regulators,
prompted me to go back into the databooks.

Looking at the National specs for the LM723, while RMS noise is specified,
it is only spec'd as typical, with no maximum.

The Motorola databook for their TL431 claims low noise, and even gives a
Noise Spectral Density graph, but nowhere do they actually specify even
the typical noise characteristics, much less the max values.

On the other hand, the National LM369 series of precision references is
fully spec'd and guaranteed 30 microVolts RMS maximum, typically 10
microVolts, unfiltered.  Adding a .1uF film cap brings it down to 4
microVolts, and more is better, up to 1uF.  Also, the LM369 has ppm
stability for line, load and tempco.

Unless there is hard data that no 723 exceeds their typical noise spec,
ever, my money will continue to go with the LM369, though it is more
expensive and dictates a discrete design to the regulator, for low current
demand oscillators, a 30 milliampere buffer is a trivial exercise...

Bob T


From [e-mail] Fri Jan 12 14:12:41 1996
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From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low Noise Linear Power Supplies
Date: Wed, 10 Jan 1996 17:02:04 -0800
Organization: American Radio Relay League
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]> <4cf4hd$[e-mail]>
NNTP-Posting-Host: zlau.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)
To: Dana Myers <[e-mail]>

Dana Myers wrote:

> Is the LM723 spec taken using the integral pass transistor?

As I understand the specs, they refer to Fig 1 on page
1-185 of the Power IC's Databook.  Presumably, a load
is attached to draw 1 mA from a 5 volt regulator running
off 12 volts. Thus, the answer appears to be "yes."

Zack KH6CP/1  [e-mail]


From [e-mail] Fri Jan 12 14:12:42 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!news.uoregon.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: John&[e-mail] (John&Suzie Rollins)
Newsgroups: rec.radio.amateur.homebrew
Subject: Mailing list in Digest format vs. ???
Date: 10 Jan 96 22:32:14 GMT
Organization: Portland Mac Users Group
Lines: 5
Message-ID: <[e-mail]>
Reply-To: John&[e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I am currently recieving this mailing list in digest format, and I was
wondering how to change it to normal eMail, as I find the messages difficult
to read when in gigest form. TIA and 73

-JR


From [e-mail] Fri Jan 12 14:12:43 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!news.mathworks.com!zombie.ncsc.mil!nntp.coast.net!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: 4 Jan 1996 19:00:29 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 13
Message-ID: <4ch84d$[e-mail]>
References: <137cc$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com
Xref: news.epix.net sci.electronics.components:1107 rec.radio.amateur.homebrew:12608

In article <137cc$[e-mail]>, Hello <[e-mail]> wrote:
>Hello,
>
>Is there a remplacement for this chips ?

The NE602 is very popular, with an on-board oscillator that can be
bypassed.


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


From [e-mail] Fri Jan 12 14:12:44 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!usc!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!hpuerci.atl.hp.com!news
From: Rahul Patel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Mod for KENWOOD TR-7850
Date: 10 Jan 1996 20:10:00 GMT
Organization: HEWLETT-PACKARD CO.
Lines: 6
Distribution: world
Message-ID: <4d16eo$[e-mail]>
NNTP-Posting-Host: f3142rhp.ssr.hp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

I know this a older Kenwood 2m radio. I would like to get all/any modification
 that anyone has
come across for the radio.  Thanks a lot in advance.

73,
Rahul Patel - N4RWZ



From [e-mail] Fri Jan 12 14:12:45 1996
Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Pinout 4CX250K (coaxial base)
Date: 10 Jan 1996 00:48:25 GMT
Organization: SRC
Lines: 13
Message-ID: <4cv2dc$[e-mail]>
References: <4ctd2m$[e-mail]>
NNTP-Posting-Host: wa1rhp.iii.net
Mime-Version: 1.0
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To: [e-mail]

Hey!
    You actually have an amplifier that uses the 4CX250Rs???

I have about 50 of the tubes still in the sealed cans.

I have the varian spec sheet for the tubes too.

What freq. range was the amplifier built for?

Tom
WA1RHP




From [e-mail] Fri Jan 12 14:12:46 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.datasync.com!news
From: "G.D.Fender" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need voltages for Heathkit HA-14 Linear
Date: 9 Jan 1996 18:52:26 GMT
Organization: Eureka Labs
Lines: 10
Message-ID: <4cudha$[e-mail]>
NNTP-Posting-Host: os-ppp8.datasync.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Does anyone know the voltages needed for the Heathkit HA-14 linear amp? I
particularily need the bias voltage... Please send e-mail to

[e-mail]


Thanks es 73,

Gary - W6SZX



From [e-mail] Fri Jan 12 14:12:46 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!atlantis.utmb.edu!news.tamu.edu!news.utdallas.edu!news01.aud.alcatel.com!gatech!udel!faatcrl.faa.gov!faatcrl.faa.gov!usenet
From: "Paul D. Seyler" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NiCAD Charger Schematic?
Date: Wed, 10 Jan 1996 09:51:47 -0800
Organization: Federal Aviation Administration
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: 155.178.52.141
X-Mailer: Mozilla 2.0b3 (Win16; I)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Has anyone built or designed a peak detector type NiCad battery charger?
If so, are the schematics (or construction acticle) available?


From [e-mail] Fri Jan 12 14:12:48 1996
Path: news.epix.net!news.sprintlink.net!news.inc.net!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!usc!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NiCAD Charger Schematic?
Date: 10 Jan 1996 20:19:48 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 18
Message-ID: <4d1714$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com

Paul D. Seyler ([e-mail]) wrote:
: Has anyone built or designed a peak detector type NiCad battery charger?
: If so, are the schematics (or construction acticle) available?

There are several manufacturers of ICs that do most of the job.  For
example, if you just follow the circuits in the Maxim data sheet for
the MAX712/713, you can build a "universal" charger that you switch
the number of cells on, or a "custom" charger for a fixed battery
size.  They show both switching and linear types of circuits; the linear
is far simpler and I'd say to go with that unless you really need the
power efficiency.  DigiKey lists these parts at just over $6 each.
I couldn't say if the Maxim parts are the "best", but they should be
available and seem to do a reasonable job.

--
Cheers,
Tom
[e-mail]


From [e-mail] Fri Jan 12 14:12:48 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!paperboy.osf.org!bone.think.com!blanket.mitre.org!agate!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OLD 20M HB SSB/CW XCVR - early 60s?
Date: Tue, 09 Jan 96 18:45:50 GMT
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (David Feldman) wrote:

>Somewhere in the 1960s (I believe) there was published a design
>article for construction of a SSB transceiver. It was all solid
>state, was intended for 20 meters, was about 1/4 watt output power,
>and specifically was designed to run from a 6 (not 12) volt power
>supply. It was about the size of a cigar box as I recall,  . . .

The article was titled "A Solid-Statte S.S.B. Transceiver" and the
author was Benjamin H. Vester, W3TLN.  The circuit design uses a
combination of PNP and NPN bipolar transistors and an 8.55 MHz IF
constructed around a homebrew crystal filter.

I don't have the original QST this appeared in, but the article was
reprinted in the 1970 edition of "Single Sideband for the Radio
Amateur".  E-mail your address and I'll send a photocopy.

73,
Jack  WB3U
[e-mail]


From [e-mail] Fri Jan 12 14:12:49 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Antenna Tuner Kit-First Impressions
Date: 10 Jan 1996 09:25:59 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 22
Sender: [e-mail]
Message-ID: <4d0i9n$[e-mail]>
References: <4cs1fu$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4cs1fu$[e-mail]>, John Wilcox/NS1Z
<[e-mail]> writes:

>
>Well, I built the kit and was very happy with it. I had no problems with
>solder connections. The traces are fine (as in thin!) but seem to work
>for my setup. I run the tuner under my ICOM IC-706 in my old S-15 Jimmy
>and have had it in there for a few weeks now with not one problem. Time
>heals all wounds and, in the case of the tuner, may open some... I have
>had some correspondence with Dwayne and expect if a problem were to
>develeop I could count on him to provide any assistance possible. I would

>not only built another (if I needed it) but have heartily recommended it
>to my friends locally. It sure beats the old MFJs!
>--
>John Wilcox / NS1Z

Hi John,

Can you tell us how the software does it's thing? I'm curious about that.

73 Tom


From [e-mail] Fri Jan 12 14:12:51 1996
Path: news.epix.net!news.sprintlink.net!news.netnet.net!news.inc.net!news.uoregon.edu!cs.uoregon.edu!usenet.ee.pdx.edu!newsrelay.netins.net!solaris.cc.vt.edu!newsfeed.internetmci.com!netnews.nwnet.net!news.ohsu.edu!usenet
From: "BICC Info. Center" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 9 Jan 1996 01:27:37 GMT
Organization: OHSU
Lines: 12
Message-ID: <4csga9$[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 137.53.22.101
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

I have read all of the above mentioned comments and I agree with the
just of what is being said. What I am wondering is does the tuner work as
billed or would I be better of buying a AT-50 for my IC-706 I see one
person had had good luck with this combo does anyone else have more to
say ???

You can Email me at  [e-mail] if possible or just post it.

                                            Thanks

                                            Brad WB7TSO



From [e-mail] Fri Jan 12 14:12:53 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Ed Hare <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 10 Jan 1996 21:56:13 GMT
Organization: American Radio Relay League, Inc.
Lines: 61
Message-ID: <4d1clt$[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ehare.arrl.org
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

Mike Queally <[e-mail]> wrote:

>I also don't understand why QST would publish an article for
>a project that you can not get a part for from somewhere other then
>the author at a high price. what if I already have a chip and the
>ability to program it. I do not care to see the source code. If he
>could have provided a binary file to download from arrl BBS at least
>then I can program the chip myself.

I would not characterize the charge for the chip as "high price" -- the
author offered it with a socket for $20.00 -- perhaps a few dollars at
most over the unprogrammed device cost.

Don't get me wrong; I agree with those who are telling us all that a
construction article is more valuable to the reader if it has source
code.  I agree with the relative few who will scrounge all the parts
and program their own microprocessor that an article that is essentially
a technical description of a kit is less valuable than one that is more
complete.  When the author offered the block diagram, I think we erred in
not making the block diagram available somehow.  I agree with those who
feel that as a matter of principle QST should publish articles that are
educational.

I have to wonder, however, whether that principle should not be flexible.
I have heard from a number of folks who are glad we ran the article,
because even with its lack-of-full-information flaws, it was a useful
article.  Would it really be right for us to see a really neat
construction-project article and decide that we were not going to share
it with anyone because a relative handful of people who want to program
their own IC think that we should not? For old construction pros like you
and I, it is a big deal to program our own IC; for many of the newcomers,
it is a big deal to pick up a soldering iron and build anything useful
at all.  Perhaps we can say that this article was written for them, and
if we feel an aritcle is not useful because it is missing something, turn
the page and move on to the next.

I have been somewhat surprised to see some of the turns this thread has
taken.  I have seen a few posts that seem to imply that because QST
*occasionally* has run an article that doesn't offer source code, that
*none* of our articles are complete. In reality, over the past three
years, QST has, if memory serves, offered two articles that didn't
include source code.  FWIW, those two have proved to be among the most
popular construction projects, based on the semi-formal counts we always
get from the authors. I think that tells me that we have chosen the
exceptions to our informal "rules" wisely. (We *do* encourage all authors
to make source code available, and will continue to do so.  We have even
changed a few minds along the way.)

All in all, I think QST offers a good balance of articles, ranging from
some higher-tech articles, lots of articles for the middle ground and a
substantial section of articles that are chosen because they would
interest newcomers.  (Now, for me, the DXCC and contest results hold
little interest, but I just assume they are there for someone else and
let it go at that.)  I would join the howls of protest if all of our
articles became the "buy the kit" articles, but really don't mind seeing
the occasional gem that is like the auto-tuner-kit article.

73 from ARRL HQ,  Ed Hare, KA1CV, ARRL Laboratory Supervisor





From [e-mail] Fri Jan 12 14:12:54 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!nntp-hub2.barrnet.net!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Tuner article
Date: 9 Jan 1996 01:55:23 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 29
Message-ID: <4cshub$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <[e-mail]>,
 <[e-mail]> wrote:
>I foolishly posted several opinions on this subject over on qrp-l (or
>was it boat anchors?) just before the holidays.  I had only scanned
>the article with the Christmas rush coming.
>
>Many of the posts criticizing the authors and QST have lamented not
>being able to take the article and produce a project ranging from
>totally built from scrounged parts to bought the kit from the authors
>and put it together.  I find that this article allows exactly this
>range!

My criticism, which I don't think I've tossed into this particular
iteration of the "no source code available" discussion, is a little
different.

Just as any construction article contains a schematic of the hardware
components, the source code is analgous to a schematic of the software
components.  Seeing the details of both can be quite educational;
seeing the details of how one designer elected to split functionality
between the two is especially useful.

Making embedded code invisible discards a very important learning
opportunity.

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


From [e-mail] Fri Jan 12 14:12:56 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom4!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: Re:QST Tuner Article
In-Reply-To: [e-mail]'s message of 11 Jan 96 14:29:13 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]>
Date: Thu, 11 Jan 1996 17:15:59 GMT
Lines: 59
Xref: news.epix.net rec.radio.amateur.homebrew:12646 rec.radio.amateur.antenna:18376

Does the copyleft protect the authors from someone else using the code
in a commercial product, or just specify that all changes, as well as
the original source must be made available?

The article has got enough information to be useful as it is, both as
a kit and as food for thought, and I don't fault the ARRL for
publishing it, but it's frustrating that to do anything with that,
you'd have to reconstruct the code, instead of being able to build on
what's gone before.

It looks to me as if the MC68HC811E2 is compatible with the -A1 part
used in the article, and has 4 times as much EEPROM for the code.
This would give lots of room for additional functions.  Also, the PD0
and PD1 asynchronous serial port pins are just connected to each
other, and with the addition of an RS-232 converter could perhaps be
used to connect to a computer, or other remote controller.

I also wonder why, apparently, the unit stops tuning when it gets to a
specified level, and doesn't actually continue to find best match.

In addition, there seem to be four more A/D ports available, and I
wonder if a phase detector or other sensor could be added to make for
an even more efficient match hunting algorithm.

My preliminary checking indicates that developement hardware and
software for these microprocessors are readily available and cheap.
Check out "Nuts and Volts" or the 68HC11 microcontroller FAQ.

Also, if you just doubled the values of the capacitors and/or the
inductors, how much would you trade optimization of match for extended
capability on 160M (how much extended capability)?  This version
doesn't require the code, BTW, just the kit, a couple of capacitors,
and some wire.  If you were willing to sacrifice some of the
indicators (use an external SWR meter, say), or use the async port for
control and status, you could, I think, extend the range on 160M,
without sacrificing optimization, but this again requires modifying
the code.

I rather wonder if I'd have paid as much attention to the article if
there hadn't been so much controversy about it.
73, doug


   From: [e-mail]
   Newsgroups: rec.radio.amateur.homebrew
   Date: 11 Jan 96 14:29:13 GMT
   I would encourage authors to incorporate the "copyleft" of the Free
   Software Foundation.  This is a more restrictive copyright.  It says
   that if you modify the software for your personal use and make
   improvements, you must share those improvements freely with others.
   This is the spirit of amateur radio at its best, IMHO.

   BTW, the article was a really neat idea.  I may build one similar
   soon.

   Ray Mack
   WD5IFS
   [e-mail]



From [e-mail] Fri Jan 12 14:12:57 1996
Path: news.epix.net!news.sprintlink.net!HiWAAY.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: 8 Jan 1996 21:14:05 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <4csj1d$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>>The Vomax was a split band audio processor which is superior to RF
>>processing. I still use a modified VOMAX with my 751A.
>
>Tom, could you elaborate on this?  I was surprised by your statement,
>given the 8 dB or so improvement possible with RF processing.  Of
>course, I can see how splitting the audio spectrum to enable effective
>filtering of harmonics could be as effective, but not more so.

I'll defer to Wes on this, but briefly when clipping is done at audio, you
can process small bands that are are less than one octive wide. Harmonics
from clipping not only fall outside the passband of channels, but mixing
is reduced because there is little likelyhood two tones will appear in one
clipping channel at any one time.

RF clipping does not do this, unless the processor has several very narrow
filters feeding separate clippers.

73 Tom


From [e-mail] Fri Jan 12 14:12:58 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Question:  RF Speech Processing
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ck2p5$[e-mail]> <4cmp0n$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Date: Wed, 10 Jan 1996 16:15:25 GMT
Lines: 52

In article <[e-mail]> [e-mail]
.com (WB3U) writes:
>   [e-mail] (Gary Coffman) wrote:
>
>>You know what AM sounds like under selective fading, well the same
>>thing is possible here if the clipping of the upper and lower
>>sidebands isn't precisely symmetrical in both the amplitude and
>>frequency domains. The latter is what's different about DSB.
>     <snip>
>
>Looking at this somewhat empirically, the RF processor in my previous
>rig clipped the SSB signal at an IF frequency of 3.18 MHz.  Because it
>was SSB, the passband width was approximately 3 KHz.  That means the
>passband width was 0.094%, only slightly less than the 0.1% for the
>DSB processor at 6 MHz.  If this percentage bandwidth can be
>symmetrically clipped for SSB at 3.18 MHz, would you agree that non-
>symmetrical clipping probably won't be a factor with DSB at 6 MHz,
>assuming the circuitry is otherwise similar?

I couldn't say, because one case is SSB and the other is DSB. There's
more than just bandwidth at stake here. SSB demodulation is just a
down-conversion mixing process. If there are phase shifts between
the highest and lowest frequencies, you just get a little time
distortion, IE the old click-boom effect familiar to users of horn
speakers. But DSB demodulation is different. There, the output
audio is the vector sum of the two sidebands with respect to the
reinserted carrier. If one sideband is phase delayed with respect
to the other, amplitude distortions and waveshape changes occur
in the output.

Any shaping done after modulation and before demodulation may
result in a phase delay between the matching components of the
sidebands, and that will in turn lead to amplitude and waveshape
distortion in the output audio for DSB. I believe the correct
factor we should be concerned about is called group delay.

The classic example of this occurs in a VSB TV transmitter.
You'll get a nasty spike on the tip of sync when you demodulate
the signal because one sideband is delayed differently than the
other through the transmitter. The cure requires *predistorting*
the modulating waveform so that the incidental phase delay
introduced by the system is cancelled out. The bandwidth for
a channel 11 transmitter and H sync is 0.015%, but that's not
the important measure. The important measure is the differential
delay through the system. That only needs to be a few degrees
at 200 MHz, a very small time difference indeed.

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


From [e-mail] Fri Jan 12 14:13:00 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.cc.tut.fi!proffa.cc.tut.fi!not-for-mail
From: [e-mail] (Kein{nen Paul)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: 10 Jan 1996 17:09:21 +0200
Organization: Tampere University of Technology
Lines: 88
Distribution: world
Message-ID: <4d0kr1$[e-mail]>
References: <4ck2p5$[e-mail]> <4cmp0n$[e-mail]> <[e-mail]>
NNTP-Posting-Host: proffa.cc.tut.fi


[e-mail] (WB3U) wrote:


>   [e-mail] (W8JI  Tom) wrote:

>>The Vomax was a split band audio processor which is superior to RF
>>processing. I still use a modified VOMAX with my 751A.
>
> Tom, could you elaborate on this?  I was surprised by your statement,
> given the 8 dB or so improvement possible with RF processing.  Of
> course, I can see how splitting the audio spectrum to enable effective
> filtering of harmonics could be as effective, but not more so.

I have wondered about this too. I know that multi-band processors
are used to reduce the dynamic range (eg. in Dolby A and in more modern
variants), but usually it is about reducing the dynamic range from, say
60 dB to 40 dB for storage on tape etc.

However, if you are going to use aggressive clipping to reduce the
peak to average ratio, I do not see how tis would improve the situation
a lot. If you split the signal into multiple subbands, clip each of them,
filter out any out of band harmonics and combine the subbands into a
single stream for transmission, you can still get some nasty high peaks,
if the phase relationship is unfavorable.

Think about a simple waveform consisting of frequencies f and 2f and both
have the positive peak at the same time (this resemples the speech
waveform). aAssume that f and 2f fall into different subbands as clean
stable sinus signals with no need for clipping. Summing these signals
and you get a positive peak twice as high as the individual signal. This
corresponds  to four time peak power in an SSB transmitter compared
to a single tone. You have gained nothing with a multiband clipper.

[About DSB clipping]

> I thought about that too, but I don't see how the distortion products
> could fall in the RF passband.  For instance, let's say the balanced
> modulator is operating at 6 MHz and that it's modulated with a 1 KHz
> tone.  The output will be two carriers (DSB), one at 5,999 KHz and
> the other at 6,001 KHz.  What combination of those two carriers
> produces a distortion product that falls near the two fundamentals?

How about third (and 5th) order intermodulation products ?
2*6001-5999 = 6003 kHz and 2*5999-6001=5997 kHz and after detection
you have two signals at 3 kHz.

However, a single tone is not a realistic test signal for a clipper.
Assuming a simple two tone signal with 400 Hz and 1000 Hz tones, you get
in addition to the 3rd order products for the 1000 Hz tones (as above)
also the 3rd order products of the 400 Hz tones.

Calculating all the intermodulation products up to the 5th order,
will for the DSB case products produce within +/- 4 kHz of the DSB carrier:

<deleted 41 intermodulation product below 6.000,
which are images of those above 6.000>

3rd order 6.0002, 6.0010, 6.0012, 6.0016, 6.0018, 6.0024, 6.0030 MHz

5th order 6.0002, 6.0004, 6.0006, 6.0008, 6.0008, 6.0010, 6.0012,
          6.0016, 6.0018, 6.0020, 6.0022, 6.0024, 6.0026, 6.0030,
          6.0032, 6.0032, 6.0036, 6.0038 MHz

After the product detector you get intermodulation products practically
every 200 Hz.



In SSB clipping the only intermodulation products that fall within
4/- 4 kHz of the carrier are:

3rd order 5.9998, 6.0016 MHz
5th order 5.9992, 6.0022 MHz

if there is an USB filter after the clipper, the only audible IM products
are 1.6 kHz and 2.2 kHz.

If you run the test with more tones that are not harmonically related
to each other, the difference is even more evident.

                Paul OH3LWR

--
Phone   : [phone]                       Mail: Hameenpuisto 42 A 26
Internet: [e-mail]                      FIN-33200 TAMPERE
Telex   : 58-100 1825 (ATTN: Keinanen Paul)            FINLAND
X.400   : G=Paul S=Keinanen O=Kotiposti A=ELISA C=FI


From [e-mail] Fri Jan 12 14:13:01 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!fdn.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!gs.dfn.de!uni-erlangen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question: RF Speech Processing
Date: 10 Jan 96 08:32:12 GMT
Organization: University of the Federal Armed Forces Munich
Lines: 8
Message-ID: <claude.821262732@bauv111>
References: <[e-mail]> <4ctglh$[e-mail]>
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[e-mail] (W8JI  Tom) writes:

>I'm working on a DSP based processor now, in between 999 other things.

Can you give us more information about this work ?

Thanks es 73,
Claude


From [e-mail] Fri Jan 12 14:13:02 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (TANTONR)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: recommend good kids' crystal set?
Date: 10 Jan 1996 17:40:40 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 2
Sender: [e-mail]
Message-ID: <4d1f98$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (TANTONR)
NNTP-Posting-Host: newsbf02.mail.aol.com

Ramsey electronics markets one with a real piece of galena in it. You can
reach them at [phone] weekdays.


From [e-mail] Fri Jan 12 14:13:03 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!news.kei.com!newsfeed.internetmci.com!cdc2.cdc.net!news1.cris.com!news2.acs.oakland.edu!newshub.gmr.com!news.delcoelect.com!usenet
From: Tom Pfaffenbach <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: recommend good kids' crystal set?
Date: 11 Jan 1996 18:56:01 GMT
Organization: Delco Electronics
Lines: 9
Distribution: usa
Message-ID: <4d3mg1$[e-mail]>
References: <[e-mail]> <4d1f98$[e-mail]>
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To: [e-mail]

When my boys were in scouts, the scout leader asked me about crystal sets. I o
ffered a
slightly different suggestion for a project. W
e bought RadioShack "Flavor-Radio's for about 5$ apiece, disassembled them int
o semi-kit form,
ie: case, speaker, battery, and circuit board, and set up an oscillator, voltm
eter and
soldering station.  We helped helped each of the boys with re-assembly, after
letting them test
the battery and the speaker and earphone. Over about 3 meetings each boy learn
ed something
about electronics, and had a real working radio that he had built and could sh
ow off without a
100' outdoor antenna.



From [e-mail] Fri Jan 12 14:13:05 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!EU.net!Norway.EU.net!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!oslonett.no!sn.no!newsfeed.tip.net!zorn.mnet.medstroms.se!everyday
From: [e-mail] (G÷ran Walles)
Newsgroups: rec.radio.amateur.homebrew
Subject: REQ: RDS encoder
Date: Thu, 11 Jan 96 22:48:00 GMT
Lines: 9
Message-ID: <4d40tm$[e-mail]>
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I'm looking for schematic diagrams to build a RDS(Radio Data System) encoder
to be used with an FM-transmitter.

Please e-mail any information to:
[e-mail]

Thanks !

SM0SUV - G÷ran


From [e-mail] Fri Jan 12 14:13:06 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!enews.sgi.com!decwrl!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!est.enet.dec.com!randolph
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Reselling the home brew equipment
Date: 10 JAN 96 14:11:43
Organization: Digital Equipment Corporation
Lines: 20
Message-ID: <4d13uu$[e-mail]>
References: <4cf5k1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pipa.enet.dec.com


In article <[e-mail]>, [e-mail] (Gary
 Coffman) writes...
>Now that should give you an idea how to increase the value of your
>homebrew gear on the market. Make sure there is full documentation,
>operating instructions, schematics, theory of operation, parts lists,
>and even X-ray view board layouts if applicable.

And, based on the Motorola Micor standard of documentation: test and alignment
procedures, test equipment, circuit revision lists.

The last thing I do for any homebrew project is to draw up a nice, neat
schematic, by hand or Postscript. I put in a few annotations to help explain
anything that might be good to know down the road. If possible, I also make a
little bitty photocopy of this to tape inside the cover of the project itself.
I have them all together in a 3-ring binder next to my workbench. If I want to
modify a circuit, the schematic is in my hands in seconds.

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


From [e-mail] Fri Jan 12 14:13:07 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!spool.mu.edu!news.sol.net!news.inc.net!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Reselling the home brew equipment
Date: 11 Jan 1996 03:22:45 GMT
Organization: Los Alamos National Laboratory
Lines: 15
Message-ID: <4d1vq5$[e-mail]>
References: <4cf5k1$[e-mail]> <[e-mail]> <4d13uu$[e-mail]>
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I agree, I now create schematics and date of manufacture etc
and tape them inside the cover of the project or enclose them
inside somewhere.... that is mostly for my OWN benefit when
something dies inside later.  It's wonderful not having to try
tracking down the original design, notes, etc, that may have
been lost or misplaced.
--
|-------------------------------------------------------|
|Jim Devenport   WB5AOX                                 |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|-------------------------------------------------------|




From [e-mail] Fri Jan 12 14:13:08 1996
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!gatech!newsfeed.internetmci.com!solaris.cc.vt.edu!news.new-york.net!earth.njcc.com!usenet
From: [e-mail] (Adam Husik)
Newsgroups: rec.radio.amateur.homebrew
Subject: Standard Modification
Date: Wed, 10 Jan 1996 17:30:40 GMT
Organization: New Jersey Computer Connection, Lawrenceville, NJ
Lines: 13
Message-ID: <4d0ilt$[e-mail]>
NNTP-Posting-Host: husik.njcc.com
X-Newsreader: Forte Free Agent 1.0.82


Would anyone who has performed the Standard C508A modification be
willing to answer a few questions for me via email. I can't figure out
how to get the battery out (I tried a soldering iron but it wouldn't
come out... is it really necesary to remove it?) Also, I <think> I see
the SMT component for cell rx (all the way in the upper-right corner?)
but I cannot find the extended rx/tx  one by the CPU. What CPU!?!

I'm going out of my mind. Anyone out there that can help?

Adam




From [e-mail] Fri Jan 12 14:13:09 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!fury.berkshire.net!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!mozz.unh.edu!!moore
From: moore@ (Andrew M. Moore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ten Tec 2M Transceiver Kit
Date: 10 Jan 1996 01:49:29 GMT
Organization: UNH Space Science Center
Lines: 11
Distribution: usa
Message-ID: <4cv5v9$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: moore.sr.unh.edu

>> Does anyone knwo if Ten Tec ever intends to produce this kit or is
>> it permanently "temporarily discontinued" ?

>I was told that the 2-meter transceiver kit should be available
>within the next month or 2. (They say that they will not release

When I spoke with them around January 1, the expected release date
was February 1.  I'm really looking forward to the release of this kit.

       _  _ _  _                     _  _ _  _
-Drew   || o ||   NV1B  CFO#963  CW   || o ||


From [e-mail] Fri Jan 12 14:13:10 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!jmatk.tiac.net!user
From: [e-mail] (James M. Atkinson, Communications Engineer)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,alt.radio.scanner
Subject: TSCM  Counter  Surveillance  & Technical Security Page
Date: Wed, 10 Jan 1996 20:22:02 -0500
Organization: tscm.com
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Reply-To: [e-mail]
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We now have over 600 pages of materials on-line, over 200 photographs,
hundreds of frequencies... and we're growing rapidly

http://www.tscm.com/

Detailed listing of tools
Comprehensive reviews of TSCM equipment
Huge Publications listing
Comments on TSCM training courses
===============================================================
    James M. Atkinson          "...Shaken, not Stirred..."
    TSCM.COM
    127 Eastern Avenue #291
    Gloucester, MA 01931-8008
    URL: http://www.tscm.com/      E-Mail:  [e-mail]
 ===============================================================
    The First, The Largest, The Most Popular, and the Most
    Complete TSCM Counterintelligence Site on the Internet
 ===============================================================



From [e-mail] Fri Jan 12 14:13:10 1996
Path: news.epix.net!news.sprintlink.net!news.itsnet.com!a_wallace1.dtint.com!allen
From: Allen Wallace <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: UHF noise source
Date: 9 Jan 1996 23:32:29 GMT
Organization: Digital Technology International
Lines: 14
Distribution: world
Message-ID: <4cutud$[e-mail]>
NNTP-Posting-Host: gatekeeper0.wia.net
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X-XXMessage-ID: <AD184422F901D034@a_wallace1.dtint.com>
X-XXDate: Tue, 9 Jan 96 23:11:14 GMT

I've got a 1960's UHF noise source which I'd like some information.

It has a tube labled TD-44/7988 and is about 18 inches long. The assembly
has two UHF connectors, The tube has two wires.

How did these old noise generators work? what voltages did they use? How
much excess noise did the generate?

Thanks,


73

Allen Wallace, N7CGH


From [e-mail] Fri Jan 12 14:13:12 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr3ip47.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: UHF noise source
Date: Tue, 9 Jan 1996 21:05:30 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 33
Distribution: world
Message-ID: <[e-mail]>
References: <4cutud$[e-mail]>
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In article <4cutud$[e-mail]> Allen Wallace <[e-mail]>
 writes:
>From: Allen Wallace <[e-mail]>
>Subject: UHF noise source
>Date: 9 Jan 1996 23:32:29 GMT

>I've got a 1960's UHF noise source which I'd like some information.

>It has a tube labled TD-44/7988 and is about 18 inches long. The assembly
>has two UHF connectors, The tube has two wires.

>How did these old noise generators work? what voltages did they use? How
>much excess noise did the generate?

>Thanks,


>73

>Allen Wallace, N7CGH

Allen:

I could be (and probably am) way off here, but this sort of sounds like a gas
discharge system. In the ancient past, we used waveguide versions which had a
gas filled tube inserted at an angle through a waveguide. One end was
terminated and the other was the output spigot. I seem to remember ENRs of 15
dB or so. We had systems by both HP and AIL. If this is a gas tube, then it
requires a high voltage pulse to fire it. I can't remember what "high" means
any more though:(  One caution: if it is a gas tube and you learn how to power

it, these were very likely to generate voltage spikes at the output which
would be instant death for modern solid-state devices.

73, Wes -- N7WS


From [e-mail] Fri Jan 12 14:13:13 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!wizard.pn.com!dns.crocker.com!calweb!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: UHF noise source
Date: 10 Jan 1996 22:46:43 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 23
Message-ID: <4d1fkj$[e-mail]>
References: <4cutud$[e-mail]>
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Allen Wallace <[e-mail]> wrote:
>I've got a 1960's UHF noise source which I'd like some information.
>
>It has a tube labled TD-44/7988 and is about 18 inches long. The assembly
>has two UHF connectors, The tube has two wires.
>
>How did these old noise generators work? what voltages did they use? How
>much excess noise did the generate?
>
>Thanks,
>
>
>73
>
>Allen Wallace, N7CGH

Ok I will make a fool of myself. Maybe someone can correct me but I
seem to remember that a Mercury vapor lamp (florecent lamp) can be used
as a noise generator. You can calculate the noise temperature from
the lamp current. I seem to remember that DC was used to power the lamp.
I think this design goes back to the 1950 - 1960 time frame.
Bill K7NOM



From [e-mail] Fri Jan 12 14:13:14 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!wizard.pn.com!dns.crocker.com!calweb!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Using HP8690 with HP8410 Network Analyzer ???
Date: 10 Jan 1996 22:50:58 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 15
Message-ID: <4d1fsi$[e-mail]>
References: <4c1moh$[e-mail]> <4c22uj$[e-mail]>  <[e-mail]> <[e-mail]> <4ct03i$[e-mail]>
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Steve Sawyers n0yvy <[e-mail]> wrote:
> A cheaper alternative to paper copies is to get the micro
>fiche. It is about 20% of paper and I got a nice fiche
>reader at teh the local ham fest for $15.
>
>Now I just order the fiche and forget the paper.Takes up
>less shelf space too.
>
>de steve n0yvy
>
 I just go to the local library and use their viewer/printer to get
my paper copies. The service from HP has been very good.
Bill K7NOM




From [e-mail] Fri Jan 12 14:13:15 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: VCO power supply noise reduction
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ch6gf$[e-mail]>
Date: Wed, 10 Jan 1996 16:19:01 GMT
Lines: 23

In article <4ch6gf$[e-mail]> [e-mail] (Dana Myers) wri
tes:
>One technique I've used and seen used elsewhere to reduce the noise
>on a power line is to insert an emitter follower into the
>power line.  The base of the emitter follower is biased from a
>resistive voltage divider attached to the collector (which forms
>the "input"), and a fairly large filter capacitor in parallel with
>a smaller one is attached from the base to ground.  I've never
>actually measured the noise reduction of this arrangement, but
>SPICE suggests it is significant.  I believe it is fair to
>analyze this circuit as an RC low pass filter with an emitter
>follower added to reduce the output impedance.

This circuit is normally treated as an electronically amplified
capacitor, IE it is modeled as a capacitor with a value set to
that of the actual base capacitor multiplied by the transistor
beta.

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


From [e-mail] Fri Jan 12 14:13:16 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr2ip25.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: Wed, 10 Jan 1996 20:32:10 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 51
Message-ID: <[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]>
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In article <[e-mail]> [e-mail] (Gary
 Coffman) writes:
>From: [e-mail] (Gary Coffman)
>Subject: Re: VCO power supply noise reduction
>Date: Wed, 10 Jan 1996 16:19:01 GMT

>In article <4ch6gf$[e-mail]> [e-mail] (Dana Myers)
>writes:
>>One technique I've used and seen used elsewhere to reduce the noise
>>on a power line is to insert an emitter follower into the
>>power line.  The base of the emitter follower is biased from a
>>resistive voltage divider attached to the collector (which forms
>>the "input"), and a fairly large filter capacitor in parallel with
>>a smaller one is attached from the base to ground.  I've never
>>actually measured the noise reduction of this arrangement, but
>>SPICE suggests it is significant.  I believe it is fair to
>>analyze this circuit as an RC low pass filter with an emitter
>>follower added to reduce the output impedance.

>This circuit is normally treated as an electronically amplified
>capacitor, IE it is modeled as a capacitor with a value set to
>that of the actual base capacitor multiplied by the transistor
>beta.

Be really careful here. I recently had to perform a failure analysis on a VCO
hybrid manufactured by a *very* well known semiconductor and hybrid house. For

obvious reasons, I must be necessarily vague about some of this.

Under certain conditions, of temperature, voltage and phase of the moon, we
were experiencing severe spurious sidebands on the UHF output. This device
used a Motorola 7812 chip as the voltage regulator and I pretty quickly
ascertained that the regulator was oscillating and modulating the VCO.

Because our application specified certain immunity to noise on the supply
voltage to this device, the hybrid manufacturer used an emitter follower as
described above to pick up a few dB of noise rejection. Because of space
limitations, he had room for only one filter capacitor (.33 uF tantalum) so
obviously, he used it on the emitter follower base. However, Motorola
specifies a minimum of .33 uF on the input of the regulator chip for
stability. Conversations with a Motorola application engineer confirmed this.

By wire-bonding the cap directly to the regulator input, I was able to
stabilize the regulator, confirming that this was the problem.  Lesson
learned:

The capacitance multiplier idea may work sometimes, but without *very* careful

analysis, you might get into real trouble.

Regards,

Wes -- N7WS



From [e-mail] Fri Jan 12 14:13:17 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!fdn.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!gs.dfn.de!uni-erlangen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: VXO
Date: 10 Jan 96 08:30:23 GMT
Organization: University of the Federal Armed Forces Munich
Lines: 5
Message-ID: <claude.821262623@bauv111>
NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de
X-Newsreader: NN version 6.5.0 #3 (NOV)

Can you give me information about good available VXO ?

Many thanks.

Claude


From [e-mail] Wed Jan 17 14:39:51 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news.cac.psu.edu!usenet
From: John Passaneau <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ***Ham WEB page For all people to use! Give it a TRY***
Date: Tue, 16 Jan 1996 15:47:00 -0800
Organization: Penn State University
Lines: 20
Message-ID: <[e-mail]>
References: <4df36s$[e-mail]>
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David Mclean wrote:
>
> Hello to all:
>
>     Come a take a look at my new web page. I have been working on it for
> the last 4 weeks. I have lots of thing that you will like. Some of the
> things that I have are: MODs, Swap Shop, Dfw repeter list, comment page,
> links to other good ham pages, call looks ups (updated by the sec), radio
> pricing, Links to QRZ,FCC,HRO, and many more. If you are a ham and would
> like you web page added to my list just send me e-mail. Please tell me
> what you like and dislike about the page. I want all types of comments.
> Hope you like what I have.
>
> --
>                                                     David Mclean
>                                               From The World of Hamradio
>                                                    KC5NNV is Clear!
> _________________________________________________________________________> -
------------------------------------------------------------------------
It might have been nice to put the address in the message.
John Passaneau, WB8EIY, State College Pa.


From [e-mail] Wed Jan 17 14:39:53 1996
From: [e-mail] (Doug Reed)
Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: 10ghz Audio link
Message-ID: <[e-mail]>
Date: Sun, 14 Jan 1996 16:48:27 -0100
X-FTN-To: [e-mail]
Lines: 68

The basic method of using a 10 GHz motion detector or Gunnplexor for a
full duplex audio link is quite simple.  All you really do is set up the
first Gunnplexor in the ham band and apply a small amount of audio to
the voltage regulator feeding the Gunn diode.  This causes the 10 GHz
oscillator to be frequency modulated by the audio signal.  Now at the
other end, you connect a wideband receiver to the detector diode of the
other Gunnplexor and tune the second Gunn oscillator to be higher or
lower in frequency by whatever the receiver frequency is.  For amateur
10 GHz voice, this is usually 30 MHz and about 75 KHz bandwidth. This is
1/2 of the full duplex link.  To go back the other way you voice
modulate the second Gunn oscillator and add another wideband FM receiver
at the same 30 MHz receive offset to the detector diode of the first
Gunn unit.  You finish off the link by generating an AFC output from one
receiver to adjust the static regulated voltage on its Gunn oscillator.
Then, whenever the first unit drifts in frequency, the second unit will
follow always keeping 30 MHz away.  NOTE: there is nothing hard and fast
about the IF frequency you use, just that ALL the stations must use the
same IF in order to communicate.

The limitations on this technique are primarily the low power from the
Gunn oscillators, their wide frequency variation with temperature, and
poor range due in part to the wideband FM modulation.  Various articles
have suggested anything up to 200 mile range using SSB and 50 to 100 mw
with a dish on 10 GHz.  The FM voice system would do well to get 10
miles with a 10 mw motion detector transmitter. The ARRL article will
basically do the voice link if you drop the data specific stuff. If you
want more info on using Gunnplexors and motion detectors for 10 GHz, the
most recent info will be in the "Above and Beyond" column in 73 magazine
during the last 5 years.  And before that there were numerous articles
about 10 GHz in Ham Radio and 73 Magazine in the 1980's.

When you go looking for equipment, the best parts to find are the
Microwave Associates Gunnplexor units.  They were designed for
communications and have a modulator diode along with the usual
oscillator and detector diodes.  This makes them more stable and easier
to modulate but they generally sell for over $200. The cheap option is
an old microwave motion detector from an alarm system.  The 10 GHz
section is an aluminum block about 1.2" by 1.8" by 2.5" with a feedhorn
or square flange on one end. These only have the oscillator diode and
detector diode.  Modulation must be floated on the static operating
voltage of the oscillator diode.  They usually run about 10 mw output
and cost under $25.  Whatever model you choose it should have a standard
waveguide flange so you can connect to different horns or mount it in
front of a parabolic dish for maximum range.  If you are really just
playing around, some old X-band radar detectors can be stripped
sometimes for this type of project but strictly as a backyard receiver
project.

I did some brain storming about this a few years ago.  You might
want to look for some old surplus low band FM receivers in the 30-40 MHz
band.  Many of them have wideband (30 KHz) IFs and all have excellent
sensitivity.  Every pair you find on one frequency can be another link.
Lets say you find receiver pairs for 31, 32, 33, and 34 MHz.  Build one
site as the central site with four receivers and four separate remote
sites each with one receiver.  The remote sites are each tuned slightly
different from the central site and is AGCed to lock to the central
site.  At the central site, add a low noise preamp to split the signal
for all four receivers and you should have four working remote
receiver voice links. I always thought this would be a cute repeater
receiver linking system but never took it anywhere.

Have fun with 10 GHZ.  73's.

Doug Reed, N0NAS                email: [e-mail]

 * SLMR 2.1a * Unable to locate Coffee -- Operator Halted!




From [e-mail] Wed Jan 17 14:39:54 1996
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From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 900 MHz Security
Date: Fri, 12 Jan 96 08:00:20 PDT
Organization: Northwest Nexus Inc.
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]> <4cjv14$[e-mail]>  <4d3oim$[e-mail]>
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In article <4d3oim$[e-mail]>, <[e-mail]> writes:

> ---snip
> However-- my Tropez 900DL (of which the ATT9100 is a clone)
> transmits a fairly powerful "image" in the clear on roughly
> 435 MHz.
> ----snip
> Chris Elmquist, N0JCF
> [e-mail]
> [e-mail]
>
Thanks for the information Chris.  I have the Tropez 900DX and I
suspect that it has the same problem.  I hadn'd pursued it, but
had noticed that it interfered with my handheld when they were
in the same room.  I'll have to check closer, I never tried to
listen while the phone was in use.

Jay



From [e-mail] Wed Jan 17 14:39:55 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!centralnews1.Central.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!usenet
From: "Dana H. Myers" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 900 MHz Security
Date: 12 Jan 1996 17:26:17 GMT
Organization: Sunsoft, Los Angeles
Lines: 38
Message-ID: <4d65jp$[e-mail]>
References: <[e-mail]> <4cjv14$[e-mail]> <4d3oim$[e-mail]>
NNTP-Posting-Host: vr1000p.west.sun.com
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[e-mail] (Chris Elmquist) wrote:
>In article <4cjv14$[e-mail]>,
>Dana Myers <[e-mail]> wrote:
>>In article <[e-mail]>,
>>Jack Mott  <[e-mail]> wrote:
>>>This posting is off-subject for this newsgroup, but I wanted access to
>>>the technical knowledge available here.  I have a 900 MHz digital
>>>cordless phone (ATT 9100), and I am interested in how secure this type of
>>>phone is with respect to over-the-air eavesdropping.  Please give a
>>>specific, technical answer addressing issues such as RF modulation and
>>>digital encoding.  If you post a response, please also send e-mail.
>>
>>The ATT 9100 uses wideband FM, modulated with the CVSD data produced
>>by a Motorola MC3418.  I suppose someone could build a receiver
>>or tweak another 9100 to eavesdrop, but, as far as I can tell, this
>>is impractical enough to be of little concern.
>>
>>Certainly it is much more secure than a conventional analog FM
>>phone, and even much more secure than a frequency-inversion
>>scrambled phone.  It isn't encrypted, but I would say it is
>>essentially secure.  I'm not a security expert, though ;-)
>>
>
>However-- my Tropez 900DL (of which the ATT9100 is a clone) transmits
>a fairly powerful "image" in the clear on roughly 435 MHz.  I discovered
>this about a year ago and made a posting or two about it.  I even
>contacted Tropez and had a dialog going with someone (a ham even) in
>their engineering group.  He promised to look into it and get back
>to me...  well, surprise... no response.  I probably could start
>pestering again but currently it's not bothering me too much.  I'm
>down on 432 where I don't hear it.  OSCAR ops would be another story.

I listened for this on my 9100, and could not hear it.  I did hear what
appeared to be a very low level spur around 435MHz, but it was not modulated
and it was only heard with the handset about 1 foot from the scanner
antenna.  I may have been overloading the scanner front end with the
handset...



From [e-mail] Wed Jan 17 14:39:56 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ? Vaacuum Capacitors
Date: 15 Jan 1996 12:26:36 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 27
Sender: [e-mail]
Message-ID: <4de2oc$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (Koellner, Guenter) writes:

>Are they tuned with pressing the axis or rotating it? If rotating, what
is
>the roation angle and what force has to be applied? Much more than a
>standard
>capacitor?
>
>Thanks for your answer!
>
>vy 73, Guenter,

Hi Guenter,

They are tuned by pulling (about 1/2 to 2 inches travel usually, depending
on the size) the axis against the suction of the vacuum, or by rotating a
screw shaft (5 to twenty turns, usually) that converts the motion to the
pull required.

The capacitors are internally like a series of alternating concentric
cylinders. One connects to a bellows that allows movement while sealing
the vacuum. It telescopes in and out to mesh and un-mesh. There are no
friction contacts, and the internal leads are short and wide. So Q is very
good.

73 Tom


From [e-mail] Wed Jan 17 14:39:57 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news3.mr.net!mr.net!imci2!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: ? Vaacuum Capacitors
Date: 15 Jan 96 23:25:00 GMT
Organization: ucsd usenet gateway
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


Hello!

a simple question, but can anyone tell me how to use vaacuum capacitors?
These are often mentioned in stateside homebrew descriptions, maybe your
surplus market is larger...

Are they tuned with pressing the axis or rotating it? If rotating, what is
the roation angle and what force has to be applied? Much more than a
standard
capacitor?

Thanks for your answer!

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


From [e-mail] Wed Jan 17 14:39:58 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!in1.uu.net!news.interlog.com!winternet.com!visi.com!usenet
From: [e-mail] (Joe Fishbein)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amidon?
Date: Fri, 12 Jan 1996 02:38:57 GMT
Organization: Vector Internet Services, Inc.
Lines: 24
Message-ID: <4d4gqd$[e-mail]>
References: <4d3bq3$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ppp34.visi.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Francis Flynn) wrote:

>Does anyone have a current address and phone number for Amidon Associates?

>The phone number I have is 213 763 5770, it's disconnnected.  Directory
>assistance was no help either.

>If they are gone, does anyone have a good source of toroids?

I had some correspondence with ARRL's Technical Information Service
last August, and they suggested the following as a source for toroids:

        Ocean State Electronics
        6 Industrial Drive
        Westerny, RI  02891

        [phone]

Hope this helps.

-- Joe Fishbein
[e-mail]




From [e-mail] Wed Jan 17 14:39:59 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!reeve.research.aa.wl.com!decwrl!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Kent Ogletree)
Newsgroups: rec.radio.amateur.homebrew
Subject: Amidon?
Date: 13 Jan 96 08:14:39 GMT
Organization: ucsd usenet gateway
Lines: 27
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

[e-mail] (Jeff Duntemann) wrote:

*[e-mail] (Francis Flynn) wrote:

*>Does anyone have a current address and phone number for Amidon Associates?

*>The phone number I have is 213 763 5770, it's disconnnected.  Directory
*>assistance was no help either.

*>If they are gone, does anyone have a good source of toroids?

*I've bought a lot of toroids from Johnson Shop Products, which I
*believe is in Cupertino.  I don't have the phone or address here at
*the office, but he should be in the phone book.

Amidon has moved to new digs, the address is:

        Amidon, Inc
        3122 Alpine Avenue
        Santa Ana, CA 92704

        Voice: [phone]
        FAX:   [phone]

73,
Kent - KD6NHP



From [e-mail] Wed Jan 17 14:40:01 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newshost.ndhm.gtegsc.com!gtewd.mtv.gtegsc.com!agate!sunsite.doc.ic.ac.uk!demon!tank.news.pipex.net!pipex!newsfeed.internetmci.com!globe.indirect.com!usenet
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amidon?
Message-ID: <4d6th4$[e-mail]>
From: [e-mail] (Jeff Duntemann)
Date: Sat, 13 Jan 1996 00:12:58 GMT
References: <4d3bq3$[e-mail]>
Organization: The Coriolis Group, Inc.
NNTP-Posting-Host: s168.phxslip4.indirect.com
X-Newsreader: Forte Free Agent v0.55
Lines: 18

[e-mail] (Francis Flynn) wrote:

>Does anyone have a current address and phone number for Amidon Associates?

>The phone number I have is 213 763 5770, it's disconnnected.  Directory
>assistance was no help either.

>If they are gone, does anyone have a good source of toroids?

I've bought a lot of toroids from Johnson Shop Products, which I
believe is in Cupertino.  I don't have the phone or address here at
the office, but he should be in the phone book.

--73--

--JD--




From [e-mail] Wed Jan 17 14:40:02 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: AW: Re: Baycom modem
Date: 12 Jan 96 21:00:00 GMT
Organization: ucsd usenet gateway
Lines: 72
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


hello folks,

since some time I follow the discussion about baycom e.g. As I am a little
competent about baycom let me drop a few words:

Regarding hardware:
Do you know about the existing baycom plug-in-card? It is call USCC
(User-SCC, SCC stands for the Z8530 beeing used). The card has two SCCs,
so four ports. One port is a AM7910 modem for HF/VHF, one a TCM3105 for VHF,
a DF9IC style 9600bd FSK modem and a straight forward port. It completly
adapts to baycom user software, to the baycom node and the baycom mailbox.
There is also a RMNC/Flexnet following software called PC/Flexnet as baycom
node will no longer be serviced. There is also a card available which has
eight ports (four SCCs) but without modems.

Regarding software:
Baycom L2.EXE offers possibilities to transmit the AX.25 over many kinds of
interfaces: Best known is the RS232 modem with the TCM3105. But there are
many others: You can use the RS232 also as interface to a kiss server, e.g.
TNC2. As mentioned above the USCC card. There is also a IPX interface which
runs over a installed network, worth which transmission type (e.g. ARCNET or
Ethernet, you just need IPX) I have a baycom mailbox running which provides
also network services using Novell Netware Lite, as I use a L2.EXE which
also
offers IPX support I can connect the mailbox via the network, too.

PC/Flexnet, which will soon replace baycom's L2.EXE, also offers the support
for IPX as far as I currently know.

This is for your information. If you need more, please be shure to send
a private copy for mee, too, as i do not always carefully watch the tcpip
and packet radio groups.

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


 ----------
| Von: mwestfal
| An: tcp-group
| Betreff: Re: Baycom modem
| Datum: Donnerstag, 11. Januar 1996 15:13
|
| In a former treatise, Dennis Rosenauer spake thusly:
|
| -> Perhaps the Baycom could be subject to the same fate as a 3C501
Ethernet
| -> card.  That is smashed with a large hammer. :-)
|
|
| "Could" be...?  You mean SHOULD be....
|
|
|
 ----------------------------------------------------------------------------

 ---
| -
| 73 de Mike,      ax.25net:    N6KUY@W6JBT.#SOCA.CA.USA.NOAM
|                   amprnet:    [e-mail] [44.18.0.49]
|                  internet:    mwestfal@.csci.csusb.edu
|                       web:    http://orion.csci.csusb.edu:8080
| Linux: the Gates of Hell shall not prevail.
| GCS/M { -d+ p+ c++ l u++ e+(*) m++(-) s/+ !n-(---) h-- !f g+ w+ t++ r-(--)
y+
| }
|
 ----------------------------------------------------------------------------

 ---
| -
|


From [e-mail] Wed Jan 17 14:40:03 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: BFO Project Questions ?????
Date: Fri, 12 Jan 96 08:07:10 PDT
Organization: Northwest Nexus Inc.
Lines: 60
Message-ID: <[e-mail]>
References: <4d1rnv$[e-mail]>
NNTP-Posting-Host: blv-pm2-ip2.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In article <4d1rnv$[e-mail]>, <[e-mail]>
---snip
>  to get me to do. How would I use a receiver to do this? What
is a GDO?
>  What  is "zero-beats"?
>
>  Answers to the above questions, as well as any general advice
would be
>  greatly appreciated.
>
>  Thanks in advance for helping a new ham,
>
>  Brian
>  KC7JRT
>
Well, Brian, you may have a fun time of it.  First, question...
Yes the IF transformers will look like little metal cubes with a
hole in them and a gray or black ferrite core inside that can be
adjusted.  The core is in the middle of a coil of wire and
adjusts the inductance of it to tune the transformer.  Some
cores have a screwdriver slot and others have a hex shaped hole.
I'm not sure why there would be seven if its just an AM only
radio. I would only expect 4 or 5.  They are not all identical,
and are color coded for function, and or frequency.  If the
radio is an AM/FM radio then some of the transformers you see
are probably for 10.7MHz instead of 455KHz. (usually FM
receivers use 10.7MHz for IF, and AM uses 455KHz).

For your case, I would expect that any of the 455KHz
transformers should work in your application.  The difference
between the various 455KHz transformers is in the turns ratio
and taps to couple into the next stage.  I expect that the
circuit that you are building only uses the primary winding on
the transformer; so you may have to figure out which pins to
use.  You could use an ohm meter to determine which pins are
part of the same coil of wire.

As for the "beat".  If you build up the circuit and connect it
to a radio and then tune in an AM radio station; then when you
turn on the BFO circuit you should hear a loud squeal (at least
you will if the bfo is near the 455KHz if of your working
radio).  Then as you tune the bfo by turning the adjustment
screw the squeal will move up or down in frequency. The squeal
is the "beat" frequency - the difference in frequency between
the bfo oscillator frequency and the radio's IF frequency.  You
want to adjust the bfo frequency until the beat frequency
approaches zero (the squeal gets lower and lower until it
disappears - if you keep tuning then it starts getting higher
and higher again).

The GDO is a Grid Dip Oscillator, which is a general purpose
test instrument that can be used to check the resonant frequency
of coils and circuits.  Actually they aren't near as common as
they were 20 years ago.

Hope that helps...you will probably get some more hints from
others....Jay (KI7RH)




From [e-mail] Wed Jan 17 14:40:04 1996
Path: news.epix.net!news.sprintlink.net!bristlecone.together.net!usenet
From: Francis Flynn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: BFO Project Questions ?????
Date: 17 Jan 1996 03:44:02 GMT
Organization: TGF Internet Services
Lines: 13
Message-ID: <4dhra2$[e-mail]>
References: <4d1rnv$[e-mail]>
NNTP-Posting-Host: vtr144.ramp.together.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Generally, yellow is used to mark the 455khz IF Xformers, black is the
IF output and red is the local oscillator.  I used to work in a consumer
electronics repair shop and this is how most japanese comsumer type
receivers are.  Every manufacturer can do as they please, so, take this
advice with that grain of salt.  One can also deduce the function of
a transformer or coil by looking at it's position in the radio's circuit.
 If it looks like an intermediate stage, as in there are some circuits
before and after it, then you most likely have an IF transformer.  In
most cheap radios there is bound to be an IF transformer somewhere, if
the one you find at first doesn't work, try some others.

Fran KM1Z



From [e-mail] Wed Jan 17 14:40:06 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!kaiwan.kaiwan.com!not-for-mail
From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Circut req'd - telephone line in use indicator.
Date: 15 Jan 1996 20:25:22 -0800
Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338)
Lines: 25
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: kaiwan009.kaiwan.com

In article <[e-mail]>,
[e-mail] (Paul Egan) wrote:
>
> I know it is a litle off topic but here goes. I need a circut diagram for a
> "telephone line in use indicator". We have three modems on a single
> telephone line here
> and we are constantly cutting each other off. I guess it would have an
> LED to indicate
> line usage and would be plugged into the phone jack of our modems. I have
> heard that
> manufactured units exist but can't seem to find them here in Toronto.
> Any help would be most appreciated.
> Please e-mail. Thanks.
> Paul Egan VE3GFY

At least here in the US the easiest thing is to hook a volt meter
to measure the voltage.  It should be around 48 V when no one is
on line and drop to < 10 V if the phone was in use.  That what I
do at the office.

73,

---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'


From [e-mail] Wed Jan 17 14:40:06 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!overload.lbl.gov!news.emf.net!gatech!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Philip Carter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Commercial License Exams, Columbus OH
Date: 13 Jan 1996 16:56:16 -0500
Organization: The Greater Columbus FreeNet
Lines: 6
Message-ID: <4d99q0$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
Keywords: GROL GMDSS RADAR 2T Commercial radio exams
X-Newsreader: TIN [version 1.2 PL2]

Commercial radio exams will be held in Columbus, Ohio January 20, 1996.
For more information or to register, call 614-240-0059.
--
[e-mail]
Philip L. Carter, WD8QWR
wd8qwr@w8cqk.#cmh.oh.usa.na


From [e-mail] Wed Jan 17 14:40:07 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!skypoint.com!usenet
From: Bill Risch <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Convert UHF Micor to Ham Bands and 9K6
Date: 14 Jan 1996 15:22:18 GMT
Organization: SkyPoint Communications, Inc.
Lines: 6
Message-ID: <4db73a$[e-mail]>
NNTP-Posting-Host: dial012.skypoint.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1PE (Windows; I; 16bit)

I need info on how to convert UHF Micors to the 440 ham band.  I
also need related info on converting to run 9K6.  I saw a post
not too long ago but I failed to keep in and lost the name of
the party that had the info.
Thanks in advance,  Bill K0MVH [e-mail]



From [e-mail] Wed Jan 17 14:40:08 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: re:copyleft
Date: 12 Jan 96 19:19:19 GMT
Organization: ucsd usenet gateway
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Doug Faunt correctly caught my error in suggesting using "copyleft".
If I remember correctly the "copyleft" of the FSF allows for
commercial use, so the authors would have to morph it into a limited
use license of their copyright.  This would allow unlimited personal
use, no commercial use, and require personal users to give back to the
group.  Do y'all think this would work?

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Wed Jan 17 14:40:09 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.corpcomm.net!news.pe.net!norconnect.no!news.ece.uc.edu!babbage.ece.uc.edu!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom2!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: re:copyleft
In-Reply-To: [e-mail]'s message of 12 Jan 96 19:19:19 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]>
Date: Sat, 13 Jan 1996 02:55:05 GMT
Lines: 13

I believe Phil Karn has just this sort of protection on the KA9Q
package.  It's a much more vulnerable product, and I don't know how
it's working for him.

The more I learn about the 68HC11, the more frustrated I am about
this.  As near as I can figure, the antenna tuner could be its own
developement system, with the addition of a pair of RS-232 converters,
and software to run on a PC or Mac that's available as freeware.
No EPROM programmer or eraser required.
I'm still learning.  I've been getting packages from Motorola on a
daily basis, although that's slowing down.
73, doug



From [e-mail] Wed Jan 17 14:40:10 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.bc.net!rover.ucs.ualberta.ca!tribune.usask.ca!canopus.cc.umanitoba.ca!newsflash.concordia.ca!news.nstn.ca!news.cs.indiana.edu!umn.edu!skypoint.com!usenet
From: Bill Risch <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cushman Service Monitor Frequecy Expansion [cush.txt] (1/1)
Date: 14 Jan 1996 00:59:14 GMT
Organization: SkyPoint Communications, Inc.
Lines: 4
Message-ID: <4d9kh2$[e-mail]>
References: <4d7dt4$[e-mail]>
NNTP-Posting-Host: dial033.skypoint.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1PE (Windows; I; 16bit)
To: WB6HRO

What did you use to zip this file?  I can't seem to get unpacked with
any of the utilities I have.  Pkzip and the like.
thanks  in advance,  Bill



From [e-mail] Wed Jan 17 14:40:12 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.nd.edu!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!dobie.loop.com!news
From: WB6HRO
Newsgroups: rec.radio.amateur.homebrew
Subject: Cushman Service Monitor Frequecy Expansion [cush.txt] (1/1)
Date: 13 Jan 1996 04:53:56 GMT
Organization: The Loop
Lines: 60
Distribution: world
Message-ID: <4d7dt4$[e-mail]>
NNTP-Posting-Host: pma104.loop.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

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M````````````````````````````````````````````````````````````
M````````````````````````````````````````````````````````````
H``````````````````````````````````````````````````````
`
end


From [e-mail] Wed Jan 17 14:40:13 1996
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!news99.sunet.se!erinews.ericsson.se!eua.ericsson.se!news.algonet.se!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!agate!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!decwrl!tribune.usask.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03
From: VE4KLM <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: E.J. Sterba article of July 1931 ?
Date: Thu, 11 Jan 1996 10:45:35 -0600
Organization: The University of Manitoba
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: access.mbnet.mb.ca
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


I want to know how I can get hold of an article published
by E.J. Sterba in the July 1931 Issue of the Proceedings of the
Institute of Radio Engineers (starting page 1184).

The article was a detailed description of the Sterba array.

Can anyone help me ?

Maiko Langelaar
VE4KLM, Winnipeg

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



From [e-mail] Wed Jan 17 14:40:14 1996
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From: [e-mail] (John Rice)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Electonic flash unit problem
Date: 12 Jan 96 17:13:33 CDT
Organization: Teradyne Inc., Telecommunications Division
Lines: 23
Message-ID: <[e-mail]>
References: <4d3541$[e-mail]>
NNTP-Posting-Host: riker1.ttd.teradyne.com
Xref: news.epix.net rec.radio.amateur.misc:96882 rec.radio.amateur.homebrew:12698

In article <4d3541$[e-mail]>, [e-mail]
m (DCG Mktg Docmnt (Ivrea)) writes:
>
> I have an electronic flash unit purchased in 1970. After being unused for
> many years, I find that now it does not function correctly. The lamp is
> powered by 250 Vcc and the flash is triggered by a pulse. I have
> checked the capacitor, which is in good condition. Has the lamp failed
> through again?? Does anybody have the answer?

How did you 'check the cap' ? Were you able to determine that it would
hold a charge, or did you just check that it wasn't shorted ?

The most likely failure is that the cap is indeed open and will not take
a charge. That's always been the problem in the 3 or 4 that I've had die
on me over the years.


--------

   John Rice -  K9IJ       | "I speak for myself, not my employer".
   [e-mail]         |  Miracles, Magic and Sleight-of-hand done here.
   [e-mail]          |  Licensed since 1959
   (708)-438-5065 - (bbs ) |  Ex: K8YZR, KH6GHC, WB9CSP, W9MMB, WA1TXV



From [e-mail] Wed Jan 17 14:40:15 1996
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From: [e-mail] (John D. Rhodes)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Electonic flash unit problem
Date: Sun, 14 Jan 96 00:44:43 GMT
Organization: Teleport - Portland's Public Access [phone]
Lines: 24
Message-ID: <4d9jlu$[e-mail]>
References: <4d3541$[e-mail]> <[e-mail]>
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X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.radio.amateur.misc:96907 rec.radio.amateur.homebrew:12709

In article <[e-mail]>,
   [e-mail] (John Rice) wrote:
>In article <4d3541$[e-mail]>,
[e-mail] (DCG Mktg Docmnt (Ivrea)) writes:
>>
>> I have an electronic flash unit purchased in 1970. After being unused for
>> many years, I find that now it does not function correctly. The lamp is
>> powered by 250 Vcc and the flash is triggered by a pulse. I have
>> checked the capacitor, which is in good condition. Has the lamp failed
>> through again?? Does anybody have the answer?

I've had trouble with the trigger transformer in several (cheap) flash units.
Tthe transformer is supposed to develop an 1-2 kv pulse.  I think the failure
mode is an internal short (probably between layers of the secondary).

A cheap (often free) replacement can be had from your local color print
processor.  Those throw-away cameras have complete flash units.  Often, you
can get a couple of cameras just for the asking.  The trigger transformer is
easy to identify.


John D. Rhodes - AA7HL
Vancouver, WA
[e-mail]


From [e-mail] Wed Jan 17 14:40:17 1996
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From: Steve Sawyers n0yvy <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: Miniature Vaccum Relays 5KV 15A SPST Latching $20
Date: 9 Jan 1996 05:37:07 GMT
Organization: Internet Navigator, Inc.
Lines: 93
Message-ID: <4csuu3$[e-mail]>
NNTP-Posting-Host: dip49.inav.net
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

FS: Miniature Vaccum Relays 5KV 15A SPST Latching

I am not sure this is appropriate for this
newsgroup, but these are definitely builderÆs
parts and there has been a lot of discussion the
QST antenna article which prompted me to buy
them.

New Miniature Vacuum Relays

Manufacturer:        Kilovac
Model :              K41P
Contact:             SPST Latching

Contact Ratings:
Freq        Volts    AMPS
DC-60Hz     5,000    15 A
2.5MHz      4,500    12 A
16 MHz      3,500     8 A
32 MHz      2.800     6 A

Contact Capacitance
  Between Open Contacts   1.2 pF
  Open Contacts to Ground 1.2 pF


Coil Voltage:        26.5 VDC Momentary
Coil Resistanc :     80   Ohms
 6 ms minimum pulse
 Not for Continuous Duty


Operate Time Max:     6   milli-seconds

Shock load rating:   30   Peak G's

Operating Temp.:     -55 to +125 degrees C

Mechanical Life:     1,000,000 Cycles

Nominal Weight:      1    oz.

These are approximately 1/2ö in Diameter and 2ö
Long. They are designed for Mid body flange
mounting, and mounting must be grounded.

Note: There are two coils, one to open and one to
close. Coils can only take a pulse, as continuous
loading will fry them, but it only takes a 10 ms
pulse to kick them on or off.

They are used in military automatic tuning
couplers. They are new in factory boxes of 42
each. I stumbled across about 1000 of these and
had to buy them all to get what I wanted. So
decided to sell the excess. I have about 300 of
them left, but may be able to get more.

Will sell any quantity.

Price: $20 Each

$5 Shipping and $5 COD (if applicable) per order
Free shipping and COD of orders of 10 or more.

I called KiloVac and they are quoting $75 each in
quantity 100, Jennings has a similar part at $48
for quantity 100.

Best installation is to mount thru a drilled
aluminum plate to provide shielding between high
voltage RF and control voltage.

I am going to use them for a high power version
of the QST automatic antenna tuner. Will need to
beef the coils and caps, but the micro processor
won't care. It does take a circuit mod to drive
two coils on the transition rather than one via
level, and the sensor needs to be redesigned. Am
also going to use for tower mounted switch boxes
using a 3 to 8 decoder and a little driver logic.

I am sure other people have other ideas.

Steve Sawyers (n0yvy) [e-mail]
1822 Somerset Drive
Marion IA 52302

evening phone(CST): [phone]






From [e-mail] Wed Jan 17 14:40:18 1996
Path: news.epix.net!news.sprintlink.net!news.oz.net!news.wwa.com!news
From: {Gary} KF9CM [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: Vhf High Power Duplexer
Date: 13 Jan 1996 02:14:01 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
Lines: 26
Message-ID: <4d74h9$[e-mail]>
NNTP-Posting-Host: vh1-035.wwa.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)

I have for sale a Sinclair 4 cavity  high power VHF duplexer Model# Q-202GC. T
o my
knowledge it's never been used.  The cavities are inclosed in a steel cabnet w
ith
(3) three conectors on the side.  The frequency tuning range is from 132 to 17
4 Mhz
and I have the complete tuning manual.

The Electrical Specifications are as follows:

INSERTION LOSS= Tx 1.5 db
                             Rx 1.5 db
ISOLATION, Tx Noise at Rx frequency       = 80 db
                  Tx Frequency at Rx Terminal   = 80db

MINIMUM ISOLATION Between Tx and Rx Frequencies = 50db

MINIMUM SEPARATION  = 500Khz


This is a top of the line duplexer and lists from Sinclair for $1730.... I wil
l take $850
or best offer. This is for local pickup or I can deliver within a 100 mile rad
ius of
Chicago Il.


You can "E" mail me at [e-mail]





From [e-mail] Wed Jan 17 14:40:19 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!cornellcs!rochester!news.csug.rochester.edu!rit!sunsrvr6!jdc
From: [e-mail] (James D. Cronin)
Subject: Re: Funky bias setup in VHF linear amps?
Message-ID: <[e-mail]>
Sender: [e-mail] (Operator)
Organization: Northern Telecom, Network Application Systems
References: <[e-mail]> <4ctkjp$[e-mail]>
Date: Mon, 15 Jan 1996 18:03:24 GMT
Lines: 35


Mystery solved:  While perusing ATV Quarterly, I saw a couple of notes on
power amps.  The network in question is used to suppress low frequency
oscillation.

73..Jim  N2VNO

In article <4ctkjp$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:
>Hi Jim,
>In article <[e-mail]>, [e-mail] (James D. Cronin)
>writes:
>>The schematic for a Mirage 2-meter linear amp shows a bias arrangement
>>that looks peculiar.
>>There is the usual rectifier diode from transistor base to ground
>>with a fixed resistor and trimmer potentiometer in parallel.  This part
>>looks normal.
>>What was odd was the bias supply:  Instead of being fed by a DC voltage
>>it was connected to the transistors collector through (here's the wierd
>>part) a series resistor, capacitor and choke.
>
>Don't depend on the schematic to be absolutely correct. What Mirage amp is
>it? I'll look at one and tell you how the circuit works.
>
>73 Tom
>
>
>>
>>How is this supposed to work?  Are they siphoning off some of the output
>>signal and letting the parallel diode rectify it?
>>
>>73..Jim  N2VNO
>




From [e-mail] Wed Jan 17 14:40:20 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!milano!news-relay.us.dell.com!swrinde!elroy.jpl.nasa.gov!llyene!news
From: [e-mail] (Bob Zander)
Subject: Grapefruit powered XMTR?
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: JPL
X-Newsreader: WinVN 0.92.2
Date: Tue, 16 Jan 1996 19:47:42 GMT
Lines: 11

Hi all...

I remember as a school project my Grandfather and I built a
XMTR that was powered by a penny and a quarter inserted into
a grapefruit. Well, my son needs such a project for school and
my Grandfather is no longer with us. Can some kind person point
me in a direction where I might find plans for this XMTR?

Thanks and 73

Bob KE6ZUF


From [e-mail] Wed Jan 17 14:40:21 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!milano!news-relay.us.dell.com!swrinde!elroy.jpl.nasa.gov!llyene!news
From: [e-mail] (Bob Zander)
Subject: Grapefruit powered XMTR?
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: JPL
X-Newsreader: WinVN 0.92.2
Date: Tue, 16 Jan 1996 20:03:31 GMT
Lines: 12

Hi all...

I remember as a school project my Grandfather and I built a
XMTR that was powered by a penny and a quarter inserted into
a grapefruit. Well, my son needs such a project for school and
my Grandfather is no longer with us. Can some kind person point
me in a direction where I might find plans for this XMTR?

Thanks and 73

Bob KE6ZUF



From [e-mail] Wed Jan 17 14:40:22 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!uunet!in2.uu.net!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Ham Gods and Spectrum Analyzers (Was interesti
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]>
Date: Thu, 11 Jan 1996 17:32:49 GMT
Lines: 33

In article <[e-mail]> [e-mail]
 (Hugh Duff) writes:
>
>> In article <4coc5i$[e-mail]> [e-mail] (Lrware) write
s:
>>>Bravo! Do we have an ex spectrum analyzer designer among us?
>>
>> No, just a spectrum analyzer user, and sometimes repairman.
>>
>> Gary
>>
>> Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gar
y
>
>
>Gary...Just wondering if you are getting your e-mail ?
>I sent you 2 messages within the past few weeks.
>Zack Lau tells me that you were messing with a 222 MHz TX strip design.
>I'm working on something similar...wondering if you care to share
>info ?

Hugh, my upstream smart host has been snarfed for nearly a month.
I've finally got news posting working through it again, but Email
is iffy. If you don't get a reply through the regular route, I've
setup another mail drop. Try [e-mail].

I'm working on a transverter, but I don't think that applies to
what you're doing. It's just your typical DBMs and crystal
oscillator type of thing.

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


From [e-mail] Wed Jan 17 14:40:23 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #1
Date: 12 Jan 96 13:48:33 GMT
Organization: ucsd usenet gateway
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

     >Ed Hare <[e-mail]>:
     >
     >I have been somewhat surprised to see some of the turns this thread
     >has
     >taken.  I have seen a few posts that seem to imply that because QST
     >*occasionally* has run an article that doesn't offer source code,
     >that
     >*none* of our articles are complete. In reality, over the past three
     >years, QST has, if memory serves, offered two articles that didn't
     >include source code.  FWIW, those two have proved to be among the
     >most
     >popular construction projects, based on the semi-formal counts we
     >always
     >get from the authors. I think that tells me that we have chosen the
     >exceptions to our informal "rules" wisely. (We *do* encourage all
     >authors
     >to make source code available, and will continue to do so.  We have
     >even
     >changed a few minds along the way.)

     Not to take a cheap shot but couldn't the high number of responses be
     because the source was not printed?  The authors have to be contacted
     to build the project.  This would seem to be an indication of the
     number who DO want to program their own chips but couldn't because the
     source was not there!

     Eric Bryan
     KC5EBY


From [e-mail] Wed Jan 17 14:40:24 1996
Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help HP8654A sig.gen transistor substitute
Date: 9 Jan 1996 04:42:11 GMT
Organization: Hewlett-Packard
Lines: 17
Message-ID: <4csrn3$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
Peter L. Williamson <[e-mail]> wrote:
>Hi, I am repairing a friend's HP8654A signal generator which has had a dose
>of RF "up the tail". I have repaired the attenuator but it has two shot
>transistors in the output amplifier, Q6 and Q7.  These are numbered "35824A"
>and according to local HP are part # 18-54-0696.  Does anyone in this group
>have a cross reference to a "real" transistor, eg Motorola Philips NS etc?
>The HP spares are difficult to get and a dynamite price, too much for
>experimenters pockets!.  Any help appreciated.
>Peter VK4AWP.

1854-0696 is a Philips BFQ22S, 4.2 GHz. F-sub-t at 30 mA.
Hope that helps.

Rick Karlquist, N6RK
[e-mail]
Hewlett-Packard Santa Clara Division


From [e-mail] Wed Jan 17 14:40:27 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!ub!news.kei.com!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Help With MOV's
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4d5d0k$[e-mail]> <4d7lvt$[e-mail]>
Date: Sat, 13 Jan 1996 10:46:06 GMT
Lines: 73

In article <4d7lvt$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>
>The on resistance between 6 and 20 ohms is about worthless across a power
>line, unless the transient is pretty puny or comes from a high impedance
>source. If the transcient is that frail, the transformer can handle it
>fine. If the transient comes from a "stiff" or low impedance (high
>current) source, the MOV has too high an impedance. The equipment is
>history anyway!
>
>I'm not saying MOV's are usless in all applications. They are great in
>some applications, such as telephone lines (where the goal is to protect
>the customer or house). They can certainly help protect line operated
>transformerless supplies, and can reduce the chance of arcing from
>extremely high common mode voltages between the line and chassis. MOV's
>just don't do much to help things on the secondary side of a transformer.
>A six ohm clamp isn't what I would consider particularly "hard" compared
>to the impedance of a 20 amp 120 volt supply line.

You didn't read what I wrote, Tom. During the IEEE 8/20 transient,
the MOV has an effective "on" resistance of 6.15e-6 ohm, that's
*not* 6 ohms, that's 6 *millionths* of an ohm. This is dynamic
behavior, of course, and only lasts for the 20 microseconds of
the transient waveform. If the transient persists, steady state
"on" resistance is around 20 ohms, but the device will self-
destruct under that condition.

MOVs certainly do work to protect transformer powered equipment,
as the blown MOVs in my Astron supply attest. They gave their
lives clamping the lightning transient, and the power supply
survived. On reflection, MOVs of greater than 60 joule surge
rating should have been in there. They wouldn't have died while
doing their duty.

You might think that the transformer would swallow the transient,
but it won't. The core saturation has nothing to do with it. The
transient will couple through the transformer via the inter-winding
capacitance and puncture electrolytic capacitor junctions and
solid state device junctions if the MOV is not present. The transient
is very high frequency RF.

A MOV can't be modeled as just a voltage dependent resistor. Its
dynamic behavior is much more complex than that. It's made up of
a sintered mix of electron donor and electron receptor materials.
The 60 joule device for which I quoted specs has the ability to
"eat" 3/4 of a coulomb of charge, and leak it away gradually
and safely after the event. The best model for a MOV is that of
a paralleled RC snubber, but that doesn't accurately portray the
complete device physics either. Once the charge is "swallowed"
it can't get out either way without going through the high "off"
resistance of the device.

Let me try a crude description of how a MOV works. Inside the
MOV, picture a bunch of capacitor plates separated by insulating
material. Initially, the "capacitors" have a neutral charge, and
the insulation value is high enough to prevent sensible current
flow. During a transient, the insulation breaks down, a non-destructive
(if within device joule ratings) arc forms which rapidly charges
the capacitor plates. This distributes charge throughout the device.
The potential between one "capacitor" and another is small enough
that the insulation doesn't break down, and the current can't get
back out except by very slow leakage. It "eats" charge, up to
3/4 coulomb of it for the device I described. It can't do that
indefinitely, of course, which is why it can only handle a transient
of limited duration. Longer duration overvoltages will make the
insulation arcing destructive rather than non-destructive and
the device becomes conductive and destroys itself.

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


From [e-mail] Wed Jan 17 14:40:28 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How make a (T/R Swich) ???
Date: 15 Jan 1996 16:31:29 GMT
Lines: 2
Message-ID: <4ddvh1$[e-mail]>
References: <4cvgot$[e-mail]> <[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

The TH-78A is a 2m / 440 dual band handie-talkie.



From [e-mail] Wed Jan 17 14:40:29 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!cornellcs!rochester!rocksanne!news
From: [e-mail]
Subject: How to add battery capacity to a vehicle?
Content-Type: TEXT/PLAIN; charset=US-ASCII
Message-ID: <[e-mail]>
Lines: 30
Sender: [e-mail]
Organization: Xerox
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage
Mime-Version: 1.0
Date: Mon, 15 Jan 1996 16:11:33 GMT


I am interested in increasing the battery capacity in my pick up truck to
permit it to run equipment for a longer period of time without the engine
running.  Specifically, I would like to be able to leave my remote
controllable dual band rig on as a cross band repeater without coming back to
a dead battery.  I've considered the following options, but would like
comment, feedback and suggestions.

1.
Install a deep-cycle (e.g. marine) battery in place of the existing one.
Would select one that fit in the available space and still had the
"cold-cranking amps" rating of the existing one.

2.
Install a second conventional battery in parallel with the existing one.
Don't know what kind of balancing might have to be done here.

3.
Install a second battery with a manual switch.  High Current switch=$$?.
Would it have to be at the battery instead of near the dashboard?

4.
Power the rig from a separate lead-acid or gel-cell with trickle charger
powered by an ignition-switched circuit. (I already have gel cells with about
20 amp-hours of capacity) Don't know how to construct this circuit to limit
current if battery were discharged.  (Yeah, I'm ignorant, but learning...)

Thoughts anyone?

Regards,
Paul
KB2TCG



From [e-mail] Wed Jan 17 14:40:29 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!netnews
From: Dan Davis <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HR2510
Date: Fri, 12 Jan 1996 19:00:50 -0800
Organization: Netcom
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: irv-ca14-20.ix.netcom.com
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Fri Jan 12  7:01:02 PM PST 1996
X-Mailer: Mozilla 2.0b5 (Win16; I)

need info about power mod and info on varible drive.send in to
[e-mail]

                          Thanks Dan Davis KD6UWC


From [e-mail] Wed Jan 17 14:40:30 1996
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom12!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Information on 74C945 and 74C947
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
Date: Sat, 13 Jan 1996 18:47:47 GMT
Lines: 4
Xref: news.epix.net sci.electronics.components:1240 rec.radio.amateur.homebrew:12699

Is there any place on the net I can get information about these two
IC's?  If not on the net, another good source of information?
Thanks, and 73,
doug


From [e-mail] Wed Jan 17 14:40:32 1996
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From: [e-mail] (Adam Husik)
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood TH79 Faster Scan Rate
Date: Wed, 10 Jan 1996 04:28:06 GMT
Organization: New Jersey Computer Connection, Lawrenceville, NJ
Lines: 14
Message-ID: <4cv7od$[e-mail]>
NNTP-Posting-Host: husik.njcc.com
X-Newsreader: Forte Free Agent 1.0.82


The removal of diode modification certainly extends the TX/RX
capabilities of the radio, however, I think the unit scans at a slow
rate. Has anyone discovered a way (via swapping a part or other) which
will change the rate? I will probaly end up calling Grove's to see if
they know of a way to solve the problem, however, I wanted to ask here
first.

Thanks,

Adam Husik
KB2UTP




From [e-mail] Wed Jan 17 14:40:32 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Kit for E-prom burner?
Date: 12 Jan 1996 04:34:07 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 8
Message-ID: <4d4obv$[e-mail]>
NNTP-Posting-Host: fn1.freenet.edmonton.ab.ca
X-Newsreader: TIN [version 1.2 PL2.3]

Is there a kit out there for an E-prom burner? Thanx in advance.

--
73 & ttyl     Morgan Patterson
       \\///  Internet: [e-mail]
       (o o)  Ham Radio: VE6MRP
        (_)   "What, back up my hard drive! I can't find the reverse switch"
----oOO-----OOo---------------------------------------------------------------


From [e-mail] Wed Jan 17 14:40:34 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: lofer transmitter
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4devhq$[e-mail]>
Date: Tue, 16 Jan 1996 20:09:59 GMT
Lines: 24

In article <4devhq$[e-mail]> [e-mail]
 (Thilo Kootz) writes:
>hi hams !
>i understand in usa there are longwave experimental frequencys. i
>would be interested in transmitting proposals.
>maybe using an audio amplifier ?
>does anyone have idears also about the antenna matching ?
>greetings, thilo dl9kce

In the USA there is the Lowfer "experimental band" from 160 kHz to
190 kHz, 1 watt, maximum 50 foot antenna (and feedline if used),
no license required. There is a fairly large and active group
here. Also in the USA, no license is needed for operation below 8 kHz.
I don't know of any real radio activity by experimenters down at ELF,
but there is some activity with "Earth Radio", which is really just a
sheet resistance method of sending signals. Performance can be
surprisingly good if you can deal with the power line currents, IE
*horrible* hum.

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


From [e-mail] Wed Jan 17 14:40:35 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: lofer transmitter
Date: Tue, 16 Jan 1996 16:51:34 -0800
Organization: Call America Internet Services  [phone]
Lines: 29
Message-ID: <[e-mail]>
References: <4dg7m4$[e-mail]> <4dh6in$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4dh6in$[e-mail]>

I think Jim, that you mean ten meters rather than ten feet for antenna
length.  Usually in the USA we refer to the antenna as fifty feet in
total length including the top hat.  LOWFER's are experimenters in the
160 to 190 KHz range.  Lots of good work is being done in that region
under some horrible conditions usually by hams but not necessarily so!
Cliff Buttschardt   W6HDO

On 16 Jan 1996, Jim wrote:

> This band is between 160 and 190 kHz.  There have been quite a number of art
icles
> over the years on various construction projects.  The law granting authority
 to use
> this band limits power to one watt and antenna size to 10 feet.  This size l
imit
> makes for some heavily loaded antennas!
>
> Jim, WU0I
>
>
> [e-mail] (Thilo Kootz) wrote:
> >hi hams !
> >i understand in usa there are longwave experimental frequencys. i
> >would be interested in transmitting proposals.
> >maybe using an audio amplifier ?
> >does anyone have idears also about the antenna matching ?
> >greetings, thilo dl9kce
> >
>
>
>
>


From [e-mail] Wed Jan 17 14:40:36 1996
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (N1DDZ RJC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for scope camera back
Date: 15 Jan 1996 22:00:36 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <4df4ck$[e-mail]>
Reply-To: [e-mail] (N1DDZ RJC)
NNTP-Posting-Host: newsbf02.mail.aol.com

I used to see old scope cameras at Deerfield that had 4X5 "graflok" backs
in them.  There is a 4" X 5" opening and sometimes there is a ground glass
in there.

I really just need the frame - the whole shebang would be good too.

Anyone got one kicking around?
Bob Crowley, Staff Inventor
AMBIT Corporation,
Sudbury MA


From [e-mail] Wed Jan 17 14:40:37 1996
Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!stevens-tech.edu!newsserver.jvnc.net!newsserver2.jvnc.net!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!amber1.ultranet.com!user
From: [e-mail] (Jon Goguen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Low noise pre-amp for 900 MHz
Date: 12 Jan 1996 01:19:47 GMT
Organization: UltraNet Communications, Inc.
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: amber1.ultranet.com
X-Newsreader: Value-Added NewsWatcher 2.0b22.0+

Can anyone suggest either a commercial source or plans and component
sources for the above?

Thanks in advance for all replies.

Jon


From [e-mail] Wed Jan 17 14:40:38 1996
Path: news.epix.net!news.sprintlink.net!rjo02.embratel.net.br!news.unisys.com.br!news.ironhorse.com!fury.berkshire.net!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!iafrica.com!ticsa.com!cstatd.cstat.co.za!aztec.co.za!usenet
From: [e-mail] (Tom Davies)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making PC boards from laser printer
Date: Thu, 11 Jan 1996 08:43:43 GMT
Organization: Peralex Electronic Development
Lines: 13
Message-ID: <4d2idc$[e-mail]>
References: <4bd8a1$[e-mail]> <[e-mail]>  <4bv1to$[e-mail]>  <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: peralex.aztec.co.za
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:


>I jumped in the group late and missed the original posting. Whats the story
>about laser print / circuit boards. I have used Tek Film with fair results.
>Please let me know... Ernie..

Use DejaNews, and search for the subject line.

Tom





From [e-mail] Wed Jan 17 14:40:39 1996
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From: [e-mail]
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: Sun, 14 Jan 1996 01:49:54 GMT
Organization: World-Net information exchange, Internet provider.
Lines: 12
Message-ID: <4d9nnl$[e-mail]>
References: <137cc$[e-mail]> <4ch84d$[e-mail]>
NNTP-Posting-Host: client69.sct.fr
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net sci.electronics.components:1255 rec.radio.amateur.homebrew:12713

[e-mail] (Dana Myers) wrote:

Hi  Dana,
>The NE602 is very popular, with an on-board oscillator that can be
>bypassed.

I've heard that this chip was stopped. May I'm wrong ?
Have a nice day
Happy
New                    [e-mail]
Year



From [e-mail] Wed Jan 17 14:40:40 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: Sun, 14 Jan 96 13:31:38 GMT
Organization: Home
Lines: 13
Message-ID: <[e-mail]>
References: <137cc$[e-mail]> <4ch84d$[e-mail]> <4d9nnl$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
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Xref: news.epix.net sci.electronics.components:1275 rec.radio.amateur.homebrew:12726

Elantec are advertising the EL4083C current-mode 4-quadrant multiplier
which goes up to 200 MHz. It's in an 8-pin DIL package and looks quite
easy to use. It should nake a good substitute for the Motorola devices.
Samples are available from Elantec on [phone] ext 311.

I think that the NE602 has been replaced by the NE612.

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


From [e-mail] Wed Jan 17 14:40:41 1996
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!amber1.ultranet.com!user
From: [e-mail] (Jon Goguen)
Newsgroups: alt.engineering.electrical,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Modutec AC panel freq meter - available?
Date: 16 Jan 1996 03:36:03 GMT
Organization: UltraNet Communications, Inc.
Lines: 15
Message-ID: <[e-mail]>
References: <4ddq22$[e-mail]>
NNTP-Posting-Host: amber1.ultranet.com
X-Newsreader: Value-Added NewsWatcher 2.0b22.0+
Xref: news.epix.net alt.engineering.electrical:1497 sci.electronics.components:1323 sci.electronics.equipment:756 rec.radio.amateur.equipment:23832 rec.radio.amateur.homebrew:12760

In article <4ddq22$[e-mail]>, [e-mail]
(Will Salomon) wrote:

> I am looking for a panel meter for measuring AC line frequency for a
> generator.

Will:

Shurite makes them.  A recent H+R Rademan (1-800-848-8001) catalog lists
two models with 55-65 hz range: S3-212 (2 1/2", $69.00), and S3-213 (3
1/2", $79.00).

Cheers,

Jon


From [e-mail] Wed Jan 17 14:40:42 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!academ!tcac!usenet
From: [e-mail] (Dave O'Neal)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Motorola Handie-Talkie freqs?
Date: 12 Jan 1996 22:34:25 GMT
Organization: TCA Communications of Texas
Lines: 23
Message-ID: <4d6nlh$[e-mail]>
References: <[e-mail]>
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Xref: news.epix.net rec.radio.amateur.homebrew:12659 rec.radio.amateur.equipment:23668

In article <[e-mail]>, [e-mail] says...
>
>A friend has a pair of Motorola HT600's.  They're two channel,
commercial
>grade HTs.  Trouble is, they don't seem to say on which frequencies
they
>xmt and rcv.  I'd like to be able to tune in with my Standard HT.
Does
>anyone have this information?
>
>Thanks,
>mfogarty
That particular radio has several different models.  The first three
digits of the model number will tell a person which band it is on.  To
find the frequencies in the radio, you should look under the belt clip
or remove the BACK cover and look underneath.  If this does not produce
a fequency list, you will need to take it to a radio shop and have the
the prom read.  You should know your own frequency and PL or DPL codes
when you go.  They can re-program the unit (probably for the same
charge) at the same time (if the units are compatible).  The shop I
used to work at charged $35 to do this.  You will probably have to go
to a MOTOROLA shop to have this done.



From [e-mail] Wed Jan 17 14:40:43 1996
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From: [e-mail] (Workshop)
Newsgroups: rec.radio.amateur.homebrew
Subject: ne 602/612
Date: 15 Jan 1996 09:05:38 GMT
Organization: Professional Computer Manufacturers
Lines: 9
Message-ID: <3lau5n7$[e-mail]>
NNTP-Posting-Host: workspc.pcm.co.za
X-Newsreader: News Xpress Version 1.0 Beta #3

Can anyone tell me if there is a site on the net where I can
get application notes on the ne 602 or 612 chips.They are not in any of
the data books that I have got.

You can e-mail me at [e-mail] , or post to this group.

thanks

Robin


From [e-mail] Wed Jan 17 14:40:44 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!mn6.swip.net!seunet!news2.swip.net!malin.foa.se!stazyr.lin.foa.se!user
From: [e-mail] (Stan Zyra)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ne 602/612
Date: 15 Jan 1996 17:39:51 GMT
Organization: FOA
Lines: 20
Message-ID: <[e-mail]>
References: <3lau5n7$[e-mail]>
NNTP-Posting-Host: stazyr.lin.foa.se

In article <3lau5n7$[e-mail]>, [e-mail] (Workshop) wrote:

> Can anyone tell me if there is a site on the net where I can
> get application notes on the ne 602 or 612 chips.They are not in any of
> the data books that I have got.
>
> You can e-mail me at [e-mail] , or post to this group.

> thanks

> Robin

Well, if you can not afford to buy Philips IC17 "RF/Wireless
Communications Data Handbook" take a look at:
http://www.semiconductors.philips.com/ps/philips5.html#Search
Although containing much information the site is only a complement to the
handbook.

73 de SM7EIR
Stan


From [e-mail] Wed Jan 17 14:40:45 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!mr.net!news.mr.net!uslink.net!usenet
From: [e-mail] (N0TTW)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ne 602/612
Date: Mon, 15 Jan 1996 23:20:06 GMT
Organization: For me to know.
Lines: 17
Message-ID: <4dejup$[e-mail]>
References: <3lau5n7$[e-mail]>
NNTP-Posting-Host: dial-114.uslink.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Workshop) wrote:

>Can anyone tell me if there is a site on the net where I can
>get application notes on the ne 602 or 612 chips.They are not in any of
>the data books that I have got.

>You can e-mail me at [e-mail] , or post to this group.

>thanks

>Robin
Look in the ARRL handbook. My 95 has info on this chip.

Chris
N0TTW




From [e-mail] Wed Jan 17 14:40:46 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!yama.mcc.ac.uk!io.salford.ac.uk!ais-M1-024.salford.ac.uk!eeg132
From: [e-mail] (A.VILCHES)
Newsgroups: rec.radio.amateur.homebrew
Subject: ne602 direct conv.
Date: 15 Jan 1996 21:37:25 GMT
Organization: University of Salford
Lines: 26
Message-ID: <[e-mail]>
NNTP-Posting-Host: ais-m1-024.salford.ac.uk


Hi, I'm thinking of building a direct conversion Rx using the ne602 dual
balanced mod. and a VCO made from shmitt logic (outputs squarewaves).

The resistive load from the ne602's output will feed a high gain opamp (non-
inv.) amplifier with a preset rolloff of -20db/dec and a -3db freq. of
around 1 khz (i.e. any 741 set for a gain of about 1000), this in turn is
followed by a small poweropamp output stage (gain of about 100).

The questions I would like answered are:

Can such a device detect FM as well as SSB and CW?

Would the squarewave VCO cause too many harmonic problems in the mixer?

Is -20db/dec sufficient to filter out any rf left at the output of the mixer?

I intend to vary the frequency from about 1.5Mhz to 20MHz, any ideas on the
best frequencies to monitor with such a rig?

Please send any ideas / comments to my e-mail address (post also if you
wish).

Thanks,

[e-mail]


From [e-mail] Wed Jan 17 14:40:47 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!hookup!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Randy Reames )
Newsgroups: rec.radio.amateur.homebrew
Subject: Need 10 meter conversion info for Cobra 148gtl
Date: 15 Jan 1996 18:47:40 GMT
Organization: Netcom
Lines: 10
Message-ID: <4de7gc$[e-mail]>
NNTP-Posting-Host: ix-den11-26.ix.netcom.com
X-NETCOM-Date: Mon Jan 15 10:47:44 AM PST 1996


    I need some info on converting a Cobra 148gtl to the 28.3-28.5
portion of 10 meters. I've picked up some stuff about modifying the
PLL (mb8719) circuit from some CB info but I'm not sure I trust it.
Has anyone done this successfully? Also need to modify the RIT for
both receive and xmit.

Randy
WA0TKO
[e-mail]


From [e-mail] Wed Jan 17 14:40:47 1996
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 10 meter conversion info for Cobra 148gtl
Date: 16 Jan 1996 18:48:54 GMT
Organization: Mixrowave Inc.
Lines: 29
Message-ID: <4dgrum$[e-mail]>
References: <4de7gc$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2

If remember correctly, I would float pin 10 of the MB8719 and then place a
1K pot on this pin to ground. By adjusting the pot, the pll would go thru
3 states. One is the normal state, one is a +640KHz and the other
somewhere in between is +1280KHz which brings you to 28.685 on CH40. You
need to readjust the VCO coil which is the one that contains wax and has
red plastic until the vco oscillates at this new frequency range. Once
this is done you need to retune the TX and TX coils to peak the RX and TX
on the new range.

73's
Hope this helps.
AC4OP




In article <4de7gc$[e-mail]>, [e-mail] says...
>
>
>    I need some info on converting a Cobra 148gtl to the 28.3-28.5
>portion of 10 meters. I've picked up some stuff about modifying the
>PLL (mb8719) circuit from some CB info but I'm not sure I trust it.
>Has anyone done this successfully? Also need to modify the RIT for
>both receive and xmit.
>
>Randy
>WA0TKO
>[e-mail]



From [e-mail] Wed Jan 17 14:40:48 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!nntp.cntfl.com!usenet
From: [e-mail] (Joe Leikhim)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Icom R-71A circuit board
Date: Fri, 12 Jan 1996 03:38:48 GMT
Organization: CMDS News machine
Lines: 20
Message-ID: <4d4l93$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dns90.nettally.com
X-Newsreader: Forte Free Agent 1.0.82

Jeff Hutchinson <[e-mail]> wrote:

>I'm restoring a sick R-71A receiver, and need a logic board.  Anyone out
>there with one for sale or swap?  Will buy a basket-case R-71 if the
>logic board is okay.  Vy 73, from Jeff

Try contacting WILLCO electronics
At

PO box 788
New Lenox, il, 60451

Where;

WA9fFVP
 Jack Albert  was selling the icm1024 no fail memory for $149.95 he
was also advertising to reload the memory in the IC R71 for $30.00.

Please let me know if he's still in business.



From [e-mail] Wed Jan 17 14:40:49 1996
Path: news.epix.net!news.sprintlink.net!ns1.win.net!sellington!nfourlq
Newsgroups: rec.radio.amateur.homebrew
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Steve Ellington)
From: [e-mail] (Steve Ellington)
Date: Sun, 14 Jan 1996 03:44:56 GMT
Subject: Need: Transformer
Lines: 8

Need an old power transformer to build a little tube type
transmitter. It needs to have a secondary of about 600 to 800
volts and a filiment winding for 6.3 vac. Will be glad to pay for
it and for shipping.

Please send E mail to [e-mail]

GUS N4ZO



From [e-mail] Wed Jan 17 14:40:50 1996
Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need: Transformer
Date: 15 Jan 1996 14:22:02 GMT
Organization: SRC
Lines: 5
Message-ID: <4ddnut$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: wa1rhp.iii.net
Mime-Version: 1.0
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X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

You need to list what currents the secondaries need to be.

Tom




From [e-mail] Wed Jan 17 14:40:51 1996
Path: news.epix.net!news.sprintlink.net!news.interserf.net!usenet
From: "Nancy A. Sims" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: New Meter Faces
Date: Mon, 15 Jan 1996 23:34:02 -0800
Organization: Internet Services Of Fredericksburg
Lines: 5
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Need software to make new meter faces.  Have Power Point, etc., but can't
seem to get the gradient lines perpendicular to the curved scale line.
Don't want to do a free-hand, but would like a machine generated scale.

Please send E mail to [e-mail]


From [e-mail] Wed Jan 17 14:40:52 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!csn!ub!news.localnet.com!news2.net99.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!gatech!udel!faatcrl.faa.gov!faatcrl.faa.gov!usenet
From: "Paul D. Seyler" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NiCAD Charger Schematic?
Date: Thu, 11 Jan 1996 12:50:26 -0800
Organization: Federal Aviation Administration
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]> <4d1714$[e-mail]>
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Tom Bruhns wrote:
> There are several manufacturers of ICs that do most of the job.  For
> example, if you just follow the circuits in the Maxim data sheet for
> the MAX712/713, you can build a "universal" charger that you switch
> the number of cells on, or a "custom" charger for a fixed battery ...
> Cheers,
> Tom
> [e-mail]

Thanks Tom,  this is exactly what I was looking for.  I have a couple
MAX713's on the way.  I looked through MAXIM's 1995 book, but I did'nt
realize that thay dont reprint all their parts in the current data book.
The  MAX713 is in the 1994 data book.  What other manufactures make this
type of IC?


From [e-mail] Wed Jan 17 14:40:53 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Vincent Socci ph2828)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: Nuts and Volts
Date: 15 Jan 96 12:12:02 GMT
Organization: ucsd usenet gateway
Lines: 33
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I believe the magazine is called "Nuts and Volts", not "Nuts and Bolts"
It's basicallly a classified ad magazine with a bunch of technical articles
in it.  I get it once in a while myself.  The articles are usually pretty good
.
They have "build it yourself" as well as the "look what we did" articles.
This month I read one about radio controlled robots.  One key feature is that
if you are looking for a piece of ham equipment, then someone in the classifie
ds
is selling it.

V

         ____________________________________________________________________
        /        Vince Socci           /  Lockheed Martin Control Systems   /|
       /==============================/====================================/ /
      / 600 Main Street              /   Systems Engineer                 / /
     / Johnson City, New York       /   Advanced Controls Engineering    / /
    /              13790-1888      / Email:  [e-mail]    / /
   /                              / Callsign:   KB2UXU                 / /
  /  Tel [phone]          / Marcall Tel: 8*255-2828            / /
 /  Fax [phone]          / Marcall Fax: 8*255-2213            / /
/______________________________/____________________________________/ /
|_____________________________/\____________________________________|/
                      __        __  ________
                      \ \      / / / ____  /
                       \ \    / / / /   /_/
                        \ \  / / / /
                         \ \/ /  \ \
                          \  /    \ \
                           \/      \ \
                             /\    / /
                             \ \  / /
                              \ \/ /
                               \  /
                                \/


From [e-mail] Wed Jan 17 14:40:55 1996
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From: Carter Brock <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: PC-Trace
Date: Sat, 13 Jan 1996 15:32:53 -0600
Organization: Digital Internet Access Link, Inc. Springfield, MO 873-DIAL
Lines: 8
Message-ID: <[e-mail]>
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The January issue of Nuts & Volts magazine has an article by T.J. Byers
on circuit design software under $100.  In this article there is
referance to two shareware packages "PC-Trace" and "Schematic Plus" that
are advalible from http://users.aol.com/spoulsen/index.htm.  I have
tried this URL and it goes nowhere.  Does anyone have another source for
this software?

Thanx  Carter Brock   [e-mail]


From [e-mail] Wed Jan 17 14:40:56 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.uoregon.edu!news.dacom.co.kr!vyzynz!news1.cris.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!news.itd.umich.edu!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: PC-Trace
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sun, 14 Jan 1996 19:50:16 GMT
Lines: 29

In article <[e-mail]> Carter Brock <[e-mail]> write
s:
>Content-Transfer-Encoding: 7bit
>X-Mailer: Mozilla 2.0b5 (Win95; I)
>
>The January issue of Nuts & Volts magazine has an article by T.J. Byers
>on circuit design software under $100.  In this article there is
>referance to two shareware packages "PC-Trace" and "Schematic Plus" that
>are advalible from http://users.aol.com/spoulsen/index.htm.  I have
>tried this URL and it goes nowhere.  Does anyone have another source for
>this software?

Back out a little, Carter, and it works, IE try
http://users.aol.com/spoulsen/ and you'll get the
home page. Click in the download section and you'll
get the zip file. Apparently there is no index.htm
on the server, and that's what's causing the problem.
Note, there seems to be a missing gif on the homepage
as well, ignore that too. Just go for the goodies.

The zip contains a crippled version of the software,
you've got to register it to get it to save and print,
but the price is right.

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


From [e-mail] Wed Jan 17 14:40:56 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news1!ind-003-236-131
From: [e-mail] (Mike Cline)
Subject: Re: PC-Trace
X-Nntp-Posting-Host: ind-003-236-131.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Internet, Inc.
X-Newsreader: News Xpress Version 1.0 Beta #2.1
References: <[e-mail]>
Date: Tue, 16 Jan 1996 21:03:41 GMT
Lines: 17

Carter Brock <[e-mail]> wrote:
>The January issue of Nuts & Volts magazine has an article by T.J. Byers
>on circuit design software under $100.  In this article there is
>referance to two shareware packages "PC-Trace" and "Schematic Plus" that
>are advalible from http://users.aol.com/spoulsen/index.htm.  I have
>tried this URL and it goes nowhere.  Does anyone have another source for
>this software?
>
>Thanx  Carter Brock   [e-mail]

Try leaving the "index.html" off of the URL and you'll
probably get through, I did. I don't know why, but that
happens on ocasion. It was running VERRRRRY slow, and I
aborted the download.

Mike
N9RJW


From [e-mail] Wed Jan 17 14:40:58 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: re:power inverters
Date: 12 Jan 96 19:09:24 GMT
Organization: ucsd usenet gateway
Lines: 31
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Dave Covert was looking for schematics, etc. for a 12 VDC to 120VAC
@1600 Watts inverter.

Dave:

        I suggest that instead of building one, you should just buy
one from either Damark or Crutchfield.  I don't have either catalog at
work today.  Various manufacturers make models in power levels from
140 W up to 3000 W continuous duty.  The 140W model is about $40 from
Damark and the 1500W version is in the $400 to $500 range.

        You could build your own, of course, but it would probably
cost as much as the ones you buy.  I know I couldn't build a 140W one
for $40.

      Call Damark @ [phone].  They carry 4 models of inverters
made by Recoton.  They have a 140 watt unit ($40), a 300 watt unit
($80), a 600watt/1000 watt peak unit ($200), and a 1500 watt
continuous/3000 watt peak unit ($450).  You can drive a LOT of stuff
with 3000 watts of peak power.  You need VERY big cable to attach from
the battery to the inverter.  3000 watts @ 12v is 265 Amps!

        It is interesting to note that the reason these have gotten so
inexpensive is that they are the principle ingredient in the megawatt
car stereo amplifiers!  That's the only way they can get the power
from a 12V car battery.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Wed Jan 17 14:40:58 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Publishing Articles
Date: 16 Jan 1996 19:56:04 GMT
Organization: Dover Research Corp.
Lines: 7
Message-ID: <4dgvsk$pvp$[e-mail]>

I agree with what you say "mostly".  In my case of the DigiVFO the parts I cal
led
out are not easily subed out. One the HSP45102 is a problem for me to keep on
hand so I have to tell people who call and write for info on where to buy them
to please don't.  I want em! <grin>  Actualy that is not as big a problem as i
t
was at first but "some" parts are strange and weird.  Most are not!
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Wed Jan 17 14:41:00 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Fri, 12 Jan 1996 16:47:00 -0800
Organization: Call America Internet Services  [phone]
Lines: 31
Message-ID: <[e-mail]>
References: <4d1clt$[e-mail]> <4d5d2l$[e-mail]>
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Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4d5d2l$[e-mail]>


Yes, I would also like to see a flow diagram or something similar..W6HDO

On 12 Jan 1996, W8JI Tom wrote:

> In article <4d1clt$[e-mail]>, Ed Hare <[e-mail]> writes:
>
> >All in all, I think QST offers a good balance of articles, ranging from
> >some higher-tech articles, lots of articles for the middle ground and a
> >substantial section of articles that are chosen because they would
> >interest newcomers.  (Now, for me, the DXCC and contest results hold
> >little interest, but I just assume they are there for someone else and
> >let it go at that.)  I would join the howls of protest if all of our
> >articles became the "buy the kit" articles, but really don't mind seeing
> >the occasional gem that is like the auto-tuner-kit article.
> >
> >73 from ARRL HQ,  Ed Hare, KA1CV, ARRL Laboratory Supervisor
> >
> >
>
> Nice response Ed! That's a tough job, to satisfy everyone.
>
> But I still have a question. Can anyone post or E-mail a flow chart of the
> software? I am trying to find out how the author handled that interesting
> part of the problem. Does anyone that built the tuner understand how the
> software works enought to describe the basic idea behind it?
> 73 Tom
>
>
>
>


From [e-mail] Wed Jan 17 14:41:01 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!uunet!in2.uu.net!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: QST Automatic Tuner Article
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <[e-mail]> <[e-mail]> <4d1clt$[e-mail]>
Date: Thu, 11 Jan 1996 17:25:22 GMT
Lines: 47

In article <4d1clt$[e-mail]> Ed Hare <[e-mail]> writes:
>All in all, I think QST offers a good balance of articles, ranging from
>some higher-tech articles, lots of articles for the middle ground and a
>substantial section of articles that are chosen because they would
>interest newcomers.  (Now, for me, the DXCC and contest results hold
>little interest, but I just assume they are there for someone else and
>let it go at that.)  I would join the howls of protest if all of our
>articles became the "buy the kit" articles, but really don't mind seeing
>the occasional gem that is like the auto-tuner-kit article.

I think it is a good advertisement. But ads don't belong as the
feature article in the *technical* section of the magazine. Perhaps
you could stretch a point and put it in with the other *product
reviews*, or give it coverage in the *New Products* section, but I
really think it belongs in the back with all the other *paid* advertising
by kit manufacturers.

Whether this is a great kit or not isn't the point, whether it is
a popular kit or not isn't the point, whether it is an economical
kit or not isn't the point. The point is that this isn't a technical
construction article because the primary information that makes it
an *auto* tuner is hidden from the reader. It's an ad, and QST used
member funds to *pay* to run this ad. That's not how it's supposed
to work. The company is supposed to pay *QST* for advertising space.

Firmware is virtual circuitry. Withholding information about the
firmware in a construction article is no different from withholding
schematic diagrams. Would you support paying for and publishing
a construction article that required the reader to buy the schematic
separately from the article author? (I might, that's essentially
what you're doing when you use any commercial IC. If you want the
internals, you have to buy the manufacturer's data book.) But more
to the point here, should you print a construction article where you
can't obtain the schematic, even from the author? I think not, that's
like the magic antenna tuner which was just a glob of expoxy hiding
a power resistor that QST correctly X-rayed and brought to public
attention a number of years ago. (Note: that's not a totally bogus
idea in certain special circumstances, but the way it was presented
bordered on fraud because there was no way to determine how it worked
thanks to the deliberately hidden internals.)

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


From [e-mail] Wed Jan 17 14:41:03 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!NEWS!not-for-mail
From: [e-mail] (Glenn Thorn)
Subject: Re: QST Automatic Tuner Article
Message-ID: <1e7cc$2171c.2ba@NEWS>
Date: Sun, 14 Jan 1996 07:43:39 GMT
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <[e-mail]> <[e-mail]> <4d1clt$[e-mail]> <[e-mail]>
X-Newsreader: Forte Free Agent 1.0.82
Lines: 59

[e-mail] (Gary Coffman) wrote:

Snip

>Firmware is virtual circuitry. Withholding information about the
>firmware in a construction article is no different from withholding
>schematic diagrams. Would you support paying for and publishing
>a construction article that required the reader to buy the schematic
>separately from the article author? (I might, that's essentially
>what you're doing when you use any commercial IC. If you want the
>internals, you have to buy the manufacturer's data book.) But more
>to the point here, should you print a construction article where you
>can't obtain the schematic, even from the author? I think not, that's
>like the magic antenna tuner which was just a glob of expoxy hiding
>a power resistor that QST correctly X-rayed and brought to public
>attention a number of years ago. (Note: that's not a totally bogus
>idea in certain special circumstances, but the way it was presented
>bordered on fraud because there was no way to determine how it worked
>thanks to the deliberately hidden internals.)

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

The authors of the autotuner were a bit concerned since they didn't
want 2 years of work to be stolen by another company and their code
put to use in another "like product".

A few other points:

-  The code is of no use to 90 percent of those who build the tuner,
Assembly is not easy to sit down and understand.

-  You must have some way to burn the chip, the tuner doesn't have
RS-232 capibility.

-  Dwayne will release the code for an SASE and a disk, call him!

-  The ARRL did not print the flow chart of the software, that was
their choice.  (My quess is it wouldn't mean much to the majority of
the readers)

I asked Dwayne to give me the .s19 file for posting here.  It is the
Hex dump to the chip so if you have a burner, you can upload it to the
chip if you want to purchase it or already have one.  I think he will
do it, please post or E-mail if you want it (free, of course).

In case anyone cares, I did the initial relay testing and final
product testing... for no compensation.

Great comments, everyone!

73,

de Glenn, KE3MF




From [e-mail] Wed Jan 17 14:41:05 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom2!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: QST Automatic Tuner Article
In-Reply-To: [e-mail]'s message of Sun, 14 Jan 1996 07:43:39 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]>
        <[e-mail]> <[e-mail]>
        <4d1clt$[e-mail]> <[e-mail]>
        <1e7cc$2171c.2ba@NEWS>
Date: Sun, 14 Jan 1996 16:15:46 GMT
Lines: 62


   Newsgroups: rec.radio.amateur.homebrew
   From: [e-mail] (Glenn Thorn)
   Date: Sun, 14 Jan 1996 07:43:39 GMT

   The authors of the autotuner were a bit concerned since they didn't
   want 2 years of work to be stolen by another company and their code
   put to use in another "like product".
I'm not convinced this fear is realistic, but it is apparently there.
Once again, I refer to the KA9Q code, and the protections it has.
I'd also be willing to sign a non-commercial use agreement, myself,
but that doesn't affect the education of the general ham population
issue.

   A few other points:

   -  The code is of no use to 90 percent of those who build the tuner,
   Assembly is not easy to sit down and understand.
It's not that hard, either.  And there are a lot of us who've done
some of this at various times.  The architecture of the 6800 is not
complicated, and if there's a framework to build on, it's even easier.
And, refering back to the KA9Q example, many people
have contributed to that effort to the benefit of the whole community.
But should the article be aimed at only those who build the tuner?
How about those who would be able to learn from the article how such a
thing is done?

   -  You must have some way to burn the chip, the tuner doesn't have
   RS-232 capibility.
Once again, adding this is not hard.  I actually want to be able to
control the tuner via RS-232, so it's got double usage.  Software for
this is freely available.  I suspect that most of us who would make
changes would have to replace the A1 version (512 bytes of EEPROM) of
the uprocessor with the 8E2 (2048 bytes) version, to have some working
room.  This is the big expense.

   -  Dwayne will release the code for an SASE and a disk, call him!
Now this seems to be a new offer, that I plan to take up.

   -  The ARRL did not print the flow chart of the software, that was
   their choice.  (My quess is it wouldn't mean much to the majority of
   the readers)
I've already sent a SASE for the flowchart.

   I asked Dwayne to give me the .s19 file for posting here.  It is the
   Hex dump to the chip so if you have a burner, you can upload it to the
   chip if you want to purchase it or already have one.  I think he will
   do it, please post or E-mail if you want it (free, of course).

   In case anyone cares, I did the initial relay testing and final
   product testing... for no compensation.
Thnak you very much for this.  This is one of the parts of the unit
that makes it a worthwhile article as it is, and such a shame that it
stopped when it did.

   Great comments, everyone!

   73,

   de Glenn, KE3MF

73, doug


From [e-mail] Wed Jan 17 14:41:06 1996
Path: news.epix.net!news.sprintlink.net!news.isl.net!usenet
From: [e-mail] (Tony Drumm)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Sun, 14 Jan 96 08:44:21 CST
Organization: InfoNet
Lines: 30
Message-ID: <4db5po$[e-mail]>
References: <[e-mail]> <[e-mail]> <4c6es2$[e-mail]> <[e-mail]> <[e-mail]> <4d1clt$[e-mail] <1e7cc$2171c.2ba@NEWS>
NNTP-Posting-Host: ppp-08.isl.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.9

In article <1e7cc$2171c.2ba@NEWS>, [e-mail] says...
>
>[e-mail] (Gary Coffman) wrote:
>>Firmware is virtual circuitry.  |                     |
>
>
>-  The code is of no use to 90 percent of those who build the tuner,
>Assembly is not easy to sit down and understand.
>
>-  The ARRL did not print the flow chart of the software, that was
>their choice.  (My quess is it wouldn't mean much to the majority of
>the readers)
>

I have a lot of mixed emotions on this.  It *is* 1996 and ICs are the
way electronics are built today.  I'd like to see more use of
high-function ICs in home-build articles.  On the other hand, it *is*
1996 and a lot of us make our living doing software.  I view these
articles as something to learn from.  I was unhappy that there wasn't at
least a flow chart.  My guess is radio electronics may not mean much to a
large portion of QST's readership - that's not the best excuse.  The idea
is to teach something.

I like the idea of being able to get all the parts somewhere and get the
parts that are tough to do at home (like the programmed IC).  But, ever
curious, I would like to know how it works.

Tony
AA0SM



From [e-mail] Wed Jan 17 14:41:07 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 14 Jan 1996 10:36:36 -0500
Organization: America Online, Inc. (1-800-827-6364)
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<< The authors of the autotuner were a bit concerned since they didn't
want 2 years of work to be stolen by another company and their code
out to use in another "like product". >>

That statement indicates data was withheld just to protect "two years of
work" that went into the software.

So which reason was it really? Was data accidently left out by QST as a
mere oversight or space saving gesture, or did the author request it be
left out as a favor to protect "two years" of work?

This is begining to sound like someone danced around the truth a bit in
the earlier replies.

Tom


From [e-mail] Wed Jan 17 14:41:08 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!NEWS!not-for-mail
From: [e-mail] (Glenn Thorn)
Subject: Re: QST Automatic Tuner Article
Message-ID: <1f7cc$12f11.27a@NEWS>
Date: Mon, 15 Jan 1996 07:07:23 GMT
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[e-mail] (W8JI  Tom) wrote:

<snip>

>So which reason was it really? Was data accidently left out by QST as a
>mere oversight or space saving gesture, or did the author request it be
>left out as a favor to protect "two years" of work?

The source code wasn't submitted to QST, the software flow chart was,
and they chose not to publish that. There was no accident.  QST, being
the fine journal that it is, wouldn't practice the ethics implied.
They bench tested the unit to ensure it did what was claimed.  They
aren't going to stake their reputation on something as trivial.

>This is begining to sound like someone danced around the truth a bit in
>the earlier replies.

I fail to understand the statement.  Dwayne and Gene did a lot of
pondering on the release of the source before they submitted the
article.  They (I can't speak for QST) didn't know peoples feelings on
the source code release.  That is why they are releasing the code...
because people want it.  All the comments posted and E-Mailed had a
voice and it was listened to.  I never know if I did something right
or wrong unless there is feedback.  Feedback is a good thing.

There is no dancing, right, or wrong to the situation.  What ever
their reasons, they listen to comments.  If someone doesn't like the
article, turn the page.  Any future articles will have source code
(probley downloadable from the ARRL board).

Thank you and everyone for the great comments!

73,

Glenn




From [e-mail] Wed Jan 17 14:41:09 1996
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From: Ian White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Mon, 15 Jan 1996 07:31:27 +0000
Organization: IFW Technical Services
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In article <[e-mail]>, Gary Coffman wrote:

>There's altogether too much fear among programmers (and inventors)
>that their ideas will be stolen. It happens rarely in practice, and
>when it does there are legal remedies.

I don't want to fuel paranoia among programmers, but it certainly has
happened that hardware designs (including items such as PC board
layouts) are blatantly offered on a commercial basis without the
author's permission. See the earlier postings by N7WS.

Another example involved a hardware design by a VK amateur being ripped
off and sold in the USA. By "ripped off" I mean that little or nothing
was added to the original design, and the guy who'd done all the work
never saw a red cent.

In most of these amateur radio cases, the amount of money involved is
only a few hundreds of dollars, or at most a few thousand. So although
the legal remedy exists in principle, it isn't possible in practice.
Unfortunately some cynical commercial dealers are completely aware of
this.

Even more serious is that after such an experience the victim is far
less likely to publish anything again - and that is a loss to all of us.

>It's far more important for
>a QST technical article to teach by example than any fear that someone
>may somehow benefit from the author's work. The only way pirating of
>this code could benefit another company at the expense of the original
>author is if they incorporated it into a better product at a better
>price.

Sadly, that's no longer true. If a popular homebrew project is ripped
off and marketed as a ready-built product, it will sell like hot cakes.

>

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


From [e-mail] Wed Jan 17 14:41:11 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 16 Jan 1996 10:13:02 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <[e-mail]>, Ian White
<[e-mail]> writes:

>
>Sadly, that's no longer true. If a popular homebrew project is ripped
>off and marketed as a ready-built product, it will sell like hot cakes.
>
>>
>
>73 from Ian G3SEK

Ian,

I think we miss the point. When an article is published as a teaching aid,
it is given away to everyone. The author should be prepared for that.

For example, I designed some phased receiving loops for HF many years ago.
Because I decided I wanted to market the design, I chose NOT to give any
of the information to anyone.

But if I published the idea and gave it away, it's gone. If someone copies
it and makes money, I may not like it but....tough luck. I made my choice
when I decided to give it away. I'll be damned if I would print part of it
and make the readers come begging just to "protect my work". That decision
is history when I decide to help others duplicate my work.

I know you make choices like that Ian. You sent me a regulator board
layout for HV supplies, and I make my living selling high power amplifier
designs. I may make money from something that I "stole" from you. If you
didn't want to run that risk, you wouldn't have sent me the board. I'm
sure you knew I make money from projects like that, sometimes substantial
money. And sometimes I give work away just to help people because I like
to help. Especially when they help other people.

I think articles are published to help people understand how something
works. If you don't want your idea used by others, don't publicize it.
Once you decide to share it, you've shared it. If someone wants to make
money from it, more power to them.

I wonder where we'd be if Ohm kept his work secret so people wouldn't
steal it? Maybe it'd be Ian's law, eh?? ;-) How many of us have sent Ohm's
desendents a Royality payment? How many of us watch someone else do
something, and copy the idea? How about Edison?

Come on now, if you don't want your idea "stolen" keep it to yourself.
Don't print it under the guise of helping teach and then cry thief.

73 Tom


From [e-mail] Wed Jan 17 14:41:13 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Re: QST Tuner Article
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]>
Date: Fri, 12 Jan 1996 18:21:22 GMT
Lines: 32
Xref: news.epix.net rec.radio.amateur.homebrew:12665 rec.radio.amateur.antenna:18398

In article <[e-mail]> [e-mail] (
Doug Faunt N6TQS [phone]) writes:
>Does the copyleft protect the authors from someone else using the code
>in a commercial product, or just specify that all changes, as well as
>the original source must be made available?

The latter. It also prohibits charging for the code, though a media
and distribution charge is allowed. Thus someone can't take your program
and go sell it, but they can charge a media and distribution fee to *give*
it away.

Copyleft is a powerful idea, born of concepts of academic freedom.
It encourages development by allowing access to the work of others
so you don't have to constantly be reinventing the wheel, but can
stand on the shoulders of giants while making your contribution.
It also, due to the mandatory source availability, is a powerful
teaching tool. It allows anyone to see how things work, and how
a particular problem might be addressed by a practitioner in the
field.

This latter is particularly important to an organization like the
ARRL which maintains its tax exempt status by claiming to be an
educational organization. If they wish to teach us about *auto*
tuners, then they'd better show us how the *auto* part works. Trade
secrets have no place in a tax exempt educational organization's
lead publication.

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


From [e-mail] Wed Jan 17 14:41:14 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:QST Tuner Article
Date: 11 Jan 96 14:29:13 GMT
Organization: ucsd usenet gateway
Lines: 27
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

A thought occurred to me regarding the source code issue for this
article.  One of the problems is that it is so easy for a commercial
outfit to simply lift the code as is and make profits from what was
intended to be freely distributed.  As a software professional, I
would be really hot if something I wrote in order to give away for the
benefit of the fraternity were used for profit by someone.

There is a way to protect the rights of the authors and still allow
free distribution for amateur personal use.  All the author has to do
is to copyright the source code for the program.  QST should have the
policy that they will publish articles containing copyrighted software
ONLY if the copyright holder grants a license to use for personal use
only.

I would encourage authors to incorporate the "copyleft" of the Free
Software Foundation.  This is a more restrictive copyright.  It says
that if you modify the software for your personal use and make
improvements, you must share those improvements freely with others.
This is the spirit of amateur radio at its best, IMHO.

BTW, the article was a really neat idea.  I may build one similar
soon.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Wed Jan 17 14:41:15 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: 9 Jan 1996 05:39:45 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <[e-mail]>,
[e-mail] (WB3U) writes:

>
>First, maintaining the correct phase at the output of each filter is
>probably impossible because the shift will vary across each filter's
>passband.  I'm not sure how significant this phase shift will be in
>terms of the percieved quality of the recovered audio, but having been
>in the audio business a number of years, it's a troublesome concept.
>Multiple-band phase shift is one of the characteristics of graphic
>equalizers said by many (including yours truly) to degrade their sound
>quality.  This may not be a significant issue in this application,
>but I'd be very interested in a critical listening test of the audio
>quality of one of these processors (with the filters active but the
>clipping turned off).  To clarify this a little, I'm not just referring
>to the amplitude cancellation that takes place as a result of phase
>shift, but also to the audible effects of the phase shift itself.
>
>

Hi Jack,

Vomax did this by having the "after clipping" filter shift the phase back
at the same slope as the pre-clipping filter. At RF phase control would be
easier, but the filter cost would be pretty high.

I don't see how phase shift would be a problem with DSB as long as a
narrow RF filter is avoided, but then the worry would become the lack of
signal filtering. There must be some BW control before clipping. Perhaps
an audio bandpass filter before the balanced modulator would help, since
as Wes said, the lows should be rolled off a bit before clipping and we
all know clipping out of band audio just adds needless distortion.

I'm working on a DSP based processor now, in between 999 other things.

73 Tom




From [e-mail] Wed Jan 17 14:41:17 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: 11 Jan 1996 06:23:56 GMT
Organization: Massey University, Palmerston North, NZ
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Distribution: world
Message-ID: <4d2ads$[e-mail]>
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Hi

Interesting discussion ... I built one of Wes' Split band speech processors an
d I'm
still using it - works great - thanks Wes.

An idle thought regarding comprehension.  Has anyone tried using formant filte
rs
rather than just 300-3000 speechband filters?  I'm mainly thinking about recei
ve
filtering but possibly in a processor as well.  I vaguely remember a simple RC
 filter
years ago (from NASA) that was supposed to put notches into the transmitted
audio where there shouldn't be any speech info.

Ring any bells?

Cheers
Giovanni ZL2BOI - currently discovering 40M after years with an 80/20 QRP SSB
rig.



From [e-mail] Wed Jan 17 14:41:18 1996
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From: [e-mail] (Kein{nen Paul)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: 14 Jan 1996 13:55:38 +0200
Organization: Tampere University of Technology
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Wes Stewart ([e-mail]) wrote:

> In article <4d0kr1$[e-mail]> [e-mail]
> (Kein{nen Paul) writes:

>>Think about a simple waveform consisting of frequencies f and 2f and both
>>have the positive peak at the same time (this resemples the speech
>>waveform). aAssume that f and 2f fall into different subbands as clean
>>stable sinus signals with no need for clipping. Summing these signals
>>and you get a positive peak twice as high as the individual signal. This
>>corresponds  to four time peak power in an SSB transmitter compared
>>to a single tone.
>
>This is what we call an amplifier with a gain of two. If this
>overmodulates the transmitter, we can reduce the audio gain control
>accordingly.
>
>> You have gained nothing with a multiband clipper.
>
>With your example, we can't call it a clipper because you specified no
>clipping is occurring. Obviously, there is nothing gained until we *do* allow

>clipping.  That's what it's all about.

Allowing clipping does not change the situation.
If we set the clipping at +/- 1/2 the peak amplitude in each channel,
we get square waves with half the amplitude of the pure tones (f and 2 f).
Bandlimiting the channels, the harmonics of the square wave are filtered
out and we get sine waves at 1/2 the original amplitude. Summing these
signals, we get the original signal envelope which is attenuated by 6 dB.
Since the envolope is still the same, there is not an improvement in
peak-to-average ratio compared to the case of no clipping.

I admit that assuming that the f and 2f tones of the original signal are
a bit unrealistic. For typical voice signals the harmonics are weaker
and the high frequency channels will not limit as easily as the low
frequency channels. The net effect is a change in the spectral contents
of the signal favoring the high frequencies.

This is just a high-pass filter with the corner frequency controlled
by the signal level :-)

While it is interesting to debate the peak-to-average, readability is a
much more complex subject. Other factors, such as the quality of the voice
(male/female) the spectrum of the noise+interference at the receiving
site affect the readability.

                Paul OH3LWR


From [e-mail] Wed Jan 17 14:41:20 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: 14 Jan 1996 10:37:44 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <4daqvq$[e-mail]>, [e-mail]
(Kein{nen Paul) writes:

>If we set the clipping at +/- 1/2 the peak amplitude in each channel,
>we get square waves with half the amplitude of the pure tones (f and 2
f).
>Bandlimiting the channels, the harmonics of the square wave are filtered
>out and we get sine waves at 1/2 the original amplitude. Summing these
>signals, we get the original signal envelope which is attenuated by 6 dB.
>Since the envolope is still the same, there is not an improvement in
>peak-to-average ratio compared to the case of no clipping.
>
>

No, what we get is a signal that has all the levels at different
frequencies limited at the same threshold, exactly what we try to do in
any processor!

The result is instantaneous "compression" or limiting of each frequency
sub-band to a predetermined level. It can then be re-mixed at the level we
desire without the addition of unwanted intermodulation products or
harmonics of the original input. We have simply removed all amplitude
variations in individual sub-bands and re-combined them at the ratios that
improve communications without adding unwanted byproducts.

The improvement is very real on speech, but not on a two tone test.

73 Tom


From [e-mail] Wed Jan 17 14:41:21 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr5ip42.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question:  RF Speech Processing
Date: Sun, 14 Jan 1996 14:26:14 LOCAL
Organization: Arizona Daily Star - AZSTARNET
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In article <4daqvq$[e-mail]> [e-mail] (Kein{nen Pau
l) writes:
>From: [e-mail] (Kein{nen Paul)
>Subject: Re: Question:  RF Speech Processing
>Date: 14 Jan 1996 13:55:38 +0200


>Wes Stewart ([e-mail]) wrote:

>> In article <4d0kr1$[e-mail]> [e-mail]
>> (Kein{nen Paul) writes:

>>>Think about a simple waveform consisting of frequencies f and 2f and both
>>>have the positive peak at the same time (this resemples the speech
>>>waveform). aAssume that f and 2f fall into different subbands as clean
>>>stable sinus signals with no need for clipping. Summing these signals
>>>and you get a positive peak twice as high as the individual signal. This
>>>corresponds  to four time peak power in an SSB transmitter compared
>>>to a single tone.
>>
>>This is what we call an amplifier with a gain of two. If this
>>overmodulates the transmitter, we can reduce the audio gain control
>>accordingly.
>>
>>> You have gained nothing with a multiband clipper.
>>
>>With your example, we can't call it a clipper because you specified no
>>clipping is occurring. Obviously, there is nothing gained until we *do* allo
w
>>clipping.  That's what it's all about.

>Allowing clipping does not change the situation.
>If we set the clipping at +/- 1/2 the peak amplitude in each channel,
>we get square waves with half the amplitude of the pure tones (f and 2 f).
>Bandlimiting the channels, the harmonics of the square wave are filtered
>out and we get sine waves at 1/2 the original amplitude. Summing these
>signals, we get the original signal envelope which is attenuated by 6 dB.
>Since the envolope is still the same, there is not an improvement in
>peak-to-average ratio compared to the case of no clipping.

Not quite correct but OK as far as it goes. If you have a perfect square wave,

which you will approach in your example, the peak amplitude of the
fundamental component is actually (4/pi)* square wave peak. But, you are
focusing on just two frequency components, not the whole voice spectrum that
is there simultaneously. There are many many components present that have
amplitude below the clipping threshold. These pass through with unity gain
while the higher amplitude components have their relative amplitude reduced.
This DOES reduce the peak to average ratio.

>I admit that assuming that the f and 2f tones of the original signal are
>a bit unrealistic. For typical voice signals the harmonics are weaker
>and the high frequency channels will not limit as easily as the low
>frequency channels. The net effect is a change in the spectral contents
>of the signal favoring the high frequencies.

Actually, and this is somewhat counter to what I just stated, you might
consider that the weaker high frequency components are riding on larger low
frequency components. When the lows are clipped, the highs are suppressed too.

This can also change the effective overall frequency response. The nice thing
about the split-band approach is this: you don't necessarily have to have the
same gain in each channel. The frequency response and degree of clipping can
be tailored in a very flexible fashion. I have experimented with several dB of

pre-clipping pre-emphasis and obtained reports of excellent "punch",
admittedly at the expense of "naturalness".

>This is just a high-pass filter with the corner frequency controlled
>by the signal level :-)

No.


>While it is interesting to debate the peak-to-average, readability is a
>much more complex subject. Other factors, such as the quality of the voice
>(male/female) the spectrum of the noise+interference at the receiving
>site affect the readability.

Certainly. But this is not a valid criticism of processsing, just because
it isn't the total answer. That is like saying don't bother with a better
antenna or more power because the signal may still be noisy at the other end.
If the difference is between noisy communication and no communication at all,
which would you choose?

>                Paul OH3LWR

Wes -- N7WS



From [e-mail] Wed Jan 17 14:41:22 1996
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From: [e-mail] (Murray Kelly)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question: RF Speech Processing
Date: 12 Jan 1996 03:11:08 +1000
Organization: DIALix Services, Brisbane, Australia.
Lines: 13
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Message-ID: <4d3gbc$4lp$[e-mail]>
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I don't see how you can avoid the problem of the lower SB mixing
with the upper SB of the 1st harmonic. Add em together and it looks
like a clipped audio signal -  the AF harmonics mix. The only way round this
is to use side band (single) and/or very soft clipping.

If one clips SSB the harmonics reflect away from the base band rapidly
and the mixing products are removed by the very broad 2nd SSB filter
after the clipper.

No probs.

Murray Kelly vk4aok.



From [e-mail] Wed Jan 17 14:41:23 1996
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From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: R-1051 Frequency Standard Pinout, Anyone?
Followup-To: rec.radio.amateur.homebrew
Date: 11 Jan 1996 21:14:20 GMT
Organization: A Turbulent One
Lines: 12
Distribution: usa
Message-ID: <thomas.g.booth-110196140149@160.205.101.24>
NNTP-Posting-Host: 160.205.101.24

A while back I picked up a surplus frequency standard unit from an R-1051
receiver for a little oscillator project.  Now that I'm getting serious
about using it, I've lost the pinout for it (of course, if I had a complete
R-1051, I'd be able to figure it out myself...).  Anyway, if you can
followup w/ info on the A1 thru A6 coax pins & the seven single conductor
pins on the P1 connector, I'd be much obliged.

TIA,

TGB

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


From [e-mail] Wed Jan 17 14:41:25 1996
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From: [e-mail] (Jim Horner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: recommend good kids'
Date: Fri, 12 Jan 1996 17:41:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
References: <4d3mg1$[e-mail]> <[e-mail]> <4d1f98$9js@ne
Lines: 93

TV>When my boys were in scouts, the scout leader asked me about crystal sets.
I
TV>fered a
TV>slightly different suggestion for a project. W
TV>e bought RadioShack "Flavor-Radio's for about 5$ apiece, disassembled them
i
TV> semi-kit form,
TV>ie: case, speaker, battery, and circuit board, and set up an oscillator, vo
l
TV>ter and
TV>soldering station.  We helped helped each of the boys with re-assembly, aft
e
TV>etting them test
TV>the battery and the speaker and earphone. Over about 3 meetings each boy le
a
TV>d something
TV>about electronics, and had a real working radio that he had built and could
TV>w off without a
TV>100' outdoor antenna.

along this same line...
 Here is a simple AM broadcast band, regenerative receiver. It
uses the stick antenna and the tuning capacitor from a junked AM
receiver.

                                             47Kohm
                                         o-----R-----o
                                         |           |    .04uF
                 stick antenna           |       ,---o---o--||--o----o
u-make L3        L1         L2    .01uF  |  b  ,/c   |   |      |    |
    ./^^^\   ./^^^^^^^^^^\./^^^^----||---o----<      |   |      |    |
    |    |   |            |                Q1  `\e   |   |      R    |
    |    |   |      /     |               NPN    |   |   R    22Kohm |
  +5-9v  |   o----||------o---------------------/'  /'  1Kohm   |    |
         |       /        |               o------o/'     |      |    |
         |  tuning cap   ---              |              |      |    |
         |               /// gnd          |     +5-9v----o------o    |
         |                                |                          |
         o---pot1-------pot2-------||-----o            o---<---------o
        regenerative^             .01uF                |   diode
        feedback loop                                  |
                                o----X-tal earphone----o
                                |
                               ---
                               ///gnd

           Feedback Loop Detail

                   20K           1K
                   pot1         pot2
                  / | \         / | \
  to L3_________/   |_________/   |
                  wiper  |        |        .01uF
                         |        |---------||----from collector
                         |____R___|
                              1K

1. o ' ` .   represent continuity, not components.

2. L1 and L2 are part of the stick antenna. There are 4 leads on the
    stick. The bigger coil goes across the tuning cap.

3. L3 is made by wrapping a strip of light cardboard around the ferrite
   stick and taping it. The idea is to have a short tube that you can
   slide back and forth a little bit on the ferrite stick. L3 is 4-7
   turns of hookup wire wound on this tube, and taped in place.
   It makes a difference which way current flows here. If you aren't
   getting oscillations, you can slip this cardboard/coil/tape assembly
   off the stick, flip it end for end, and slip it back on.

4. The circuit should be built over a sheet of conductive material
   connected to gnd. This `ground plane' helps the stability/performance
   quite a bit. I'm not sure why, but it does.

Operation. The feedback control is very sensitive. Turn the coarse
           control (20K pot) very slowly and you should hear noise in
           the X-tal earphone. The noise only occurs at the point where
           the circuit starts to break into oscillation. You must be
           just below, (but very close to), this point to hear AM
           broadcasts. Feedback can also be controled by sliding L3 a
           little bit along the ferrite stick. When you find the point
           where oscillation starts back off a tiny tiny bit on the 20K,
           and sneak up on it with the fine control (1K pot). You have
           to operate the fine control pot with one hand, and the tuning
           cap with the other, to tune across the band. Lower
           frequencies need less feedback.

If you can't get a noise in the earphone:
1. L3 is backwards. Turn it around
2. There is too much feedback even with pot 1 adjusted for max R.
   Remove turns from L3
I'm a beginning DIY electronics student, and not a ham, but I had a lot
of fun and learned a lot from this circuit when I started trying to
teach myself this stuff at almost 40 :).
...jim

---
 * OLX 2.1 TD * Binary tagline supplied on request. Some Assembly req'd.


From [e-mail] Wed Jan 17 14:41:26 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!news.dacom.co.kr!usenet.seri.re.kr!news.kreonet.re.kr!usenet.kornet.nm.kr!usenet
From: Butch Weber <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Remote Operating of HF station (VHF or Telephone)?
Date: Tue, 16 Jan 1996 15:05:15 -0500
Organization: KORNET (Korea Telecom)
Lines: 12
Message-ID: <[e-mail]>
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Hello, I am looking for any information on remote operation of my HF rig.
I have a Kenwood TS-440S/AT with a CL-36 with 40 meter attachment at
work and live in an apartment. I know I have seen articles in the past
about remote operations but I am in Korea and don't have access to all
my past magazine articles. I am using a 486 DX2-66 and would like to
interface the computer as well. I haven't seen anything on the Web that
relates to remote operating. If there is and I missed it could someone
please pass the information. Thanks,

Butch HL9BW

eMail = [e-mail]


From [e-mail] Wed Jan 17 14:41:27 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:RF compression
Date: 12 Jan 96 19:34:26 GMT
Organization: ucsd usenet gateway
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

There has been a thread here for a few days regarding SSB processing,
vs DSB processing vs split band baseband processing.

It started me thinking about some products the Philips and others make
called compandors (compression/expander like modem is
modulator/demodulator).  Does anyone know if these products do the
kind of compression that we seek to do in the amateur service with RF
kinds of things?  I have never seen an amateur use of these devices
that I can remember.  The only thing close was the section in the 1985
Handbook on amplitude-compandored SSB.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Wed Jan 17 14:41:28 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: RF compression
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sat, 13 Jan 1996 09:36:18 GMT
Lines: 29

In article <[e-mail]> [e-mail] writes:
>There has been a thread here for a few days regarding SSB processing,
>vs DSB processing vs split band baseband processing.
>
>It started me thinking about some products the Philips and others make
>called compandors (compression/expander like modem is
>modulator/demodulator).  Does anyone know if these products do the
>kind of compression that we seek to do in the amateur service with RF
>kinds of things?  I have never seen an amateur use of these devices
>that I can remember.  The only thing close was the section in the 1985
>Handbook on amplitude-compandored SSB.

Compressors are different from the clippers in purpose. A compressor
is an AGC amplifier that responds to *average* speech level using a
relatively slow time constant. Clipping is designed to remove momentary
voice peaks so that the peak to average ratio of speech is reduced.
This latter is important because it relaxes the constraints on the
linear amplifiers since they don't need such a high linear peak power
response. A compressor's time constant is much too slow to follow peaks,
so it doesn't relax the peak to average ratio constraint on the linear
amplifier, though it does increase the average demand on the amplifier.
The two circuits are typically used *together* to increase "talk power".

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


From [e-mail] Wed Jan 17 14:41:29 1996
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:RF compression
Date: Fri, 12 Jan 96 18:18:16 GMT
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] wrote:

>There has been a thread here for a few days regarding SSB processing,
>vs DSB processing vs split band baseband processing.
>
>It started me thinking about some products the Philips and others make
>called compandors (compression/expander like modem is
>modulator/demodulator).  Does anyone know if these products do the
>kind of compression that we seek to do in the amateur service with RF
>kinds of things?

The problem with companders and numerous other schemes is that they
require "inverse" processing at the receiver.  In other words, they're
only useful if you're communicating with a station similarly equipped.

73,
Jack  WB3U


From [e-mail] Wed Jan 17 14:41:30 1996
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!grumpy.insinc.net!news.bconnex.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!jaring.my!astoria!phoa
Newsgroups: rec.radio.amateur.homebrew
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Phoa Kia Teck)
From: [e-mail] (Phoa Kia Teck)
Date: Tue, 16 Jan 1996 14:24:10 GMT
Subject: small quantity extra components
Lines: 40

Happy Days,

I am a electronics hobbies.In the past I came across some
components which I thought other with the same hobby might be
interested.I am willing to trade for other components/books or
other Electronics items.

    1) dualgate mosfet 3SK122

    2) small signal bipolar FAC-100X package/pins

       order code HXTR3101

         NPN, Vcbo 30,Vceo 18, Ic 0.05,Pw 600mW,Ft 6000Mhz,
         hfe 50,Ice 10mA

         Application: High Freq Amp (RF/VHF/UHF)

     3) Balance mixer Diode ring

         order code 50822830 & 50822831

      4) other components!!!

  Interested kindly email.

--
    ===========================================================
      Phoa Kia Teck

      Postal address:
      22 Tramway Road,             Email: [e-mail]
      10460 Penang.                Fax  : [phone]
      Malaysia.









From [e-mail] Wed Jan 17 14:41:31 1996
Path: news.epix.net!news.sprintlink.net!wizard.pn.com!brighton.openmarket.com!decwrl!fred.interval.com!burdick.interval.com!user
From: [e-mail] (wayne burdick)
Newsgroups: rec.radio.amateur.homebrew
Subject: state-of-the-art in FSK demodulators for HF TTY?
Date: Tue, 16 Jan 1996 15:35:36 -0800
Organization: interval research
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: burdick.interval.com

What are Kantronics and others using for FSK demodulation?  XR2211,
LMC568, AMD2910?  I'd like to find a non-DSP (that is, low-current) device
that can really dig out the weak ones on HF TTY (Baudot and ASCII,
mostly).  Also, I'm looking for a TTY pen-pal/guru who can help with some
technical issues in exchange for some no-charge alpha-test hardware.

Please respond directly to [e-mail].

Thanks,
Wayne Burdick, N6KR


From [e-mail] Wed Jan 17 14:41:32 1996
Path: news.epix.net!news.sprintlink.net!mercury.galstar.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: surplus police radar
Date: 13 Jan 1996 02:46:13 GMT
Organization: Galaxy Star - Northeastern Oklahoma Internet
Lines: 14
Message-ID: <4d76dl$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: star215.galstar.com
X-Newsreader: IBM NewsReader/2 v1.2.5

I am interested in building a perimeter security system using a surplus police
radar unit.  Any suggestions or leads?  KE4GBJ

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From [e-mail] Wed Jan 17 14:41:34 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.nuri.net!imci2!newsfeed.internetmci.com!swrinde!tank.news.pipex.net!pipex!demon!ifwtech.demon.co.uk!G3SEK
From: Ian White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: TS440 and transverter
Date: Sat, 13 Jan 1996 17:44:32 +0000
Organization: IFW Technical Services
Lines: 72
Distribution: world
Message-ID: <[e-mail]>
References: <4d87d4$[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
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MIME-Version: 1.0
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In article <4d87d4$[e-mail]>, Salonen Jukka wrote:
>Hello
>Have anyboby good tips for cnnecting transverter to
>Kenwood TS-440SAT. My transverter is from 28MHz to 50MHz.
>The TX-converted needs abt. 0dBm signal and my plan
>was to take that 28MHz rf-signal before final unit.

Yes, that's the best way - see later.

>Another way is take signal from antenna-connector.
>Then i must reduce output power of final unit by using
>alc-voltage, but theres possibility for damage if my
>alc-connector poorly connected: 100w to transverter input ==
>big cloud of beautiful blue smoke.

Bad idea - and not only because of the possibility of losing the ALC
signal. Even if there is a DC signal at the ALC socket to reduce the
power to the required level, what happens when you apply RF drive?
There will be a spike of high power for typically a few milliseconds,
until the ALC system reduces the gain in the TX signal path.

At best, these spikes will hugely overdrive your transverter and will
make you very unpopular on 50MHz! At worst, there will be enough energy
to damage your transverter (though probably not enough to make a cloud
of blue smoke).

>It is also possible to run power to the dummy load and
>take signal from it by attenuator, but i dont want to
>warm up my hamschack.

That's not such a bad solution, maybe.

>If i take power before final unit, then i must somehow
>"kill" final unit or cut off the signalway from
>driver to final. If only i cut signal, is it possible that
>the final start to oscillate on its own?

This is definitely the best solution. The signal from the TX driver will
probably be quite close to the 0dBm level that you need. Use a small
two-pole relay inside the transceiver to switch the RF signal at the
input to the PA module, and also to break the +12V control line that
activates the PA on transmit. If you do not switch the control line, the
PA probably will not oscillate, but it will put out a several milliwatts
at HF due to signal leakage across the relay.

It's nice to activate the HF/transverter changeover from the
transverter, so that the relay switches automatically when you power-up
the transverter. You can route the DC supply through the TX coaxial
cable.

If your transceiver has a separate RX input socket, always use that for
the transverter. If you use the main SO-239 socket, then sooner or later
you *will* transmit 100W into the back-end of the receive converter.
More blue smoke...

>In ICOM IC-735 is connector for transverter, but i dont
>know how it is done in that rig.

I believe the IC-735 uses the same coax for both TX and RX, so you would
need another TX/RX relay at the output of your transverter. Separate
cables for TX and RX are much more versatile.

For more information on transverter interfacing, see 'The VHF/UHF DX
Book' (now obtainable world-wide from RSGB).



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


From [e-mail] Wed Jan 17 14:41:35 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!fnnews.fnal.gov!usenet
From: "John T. Anderson" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Tubes, anyone?
Date: 12 Jan 1996 18:48:29 GMT
Organization: JPS Designs
Lines: 6
Message-ID: <4d6adt$[e-mail]>
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Mime-Version: 1.0
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I have recently acquired a box of tubes, all in cardboard boxes, many
new, some used, as part of a bulk buy of other equipment.  If anyone is
looking to buy a tube, please send me an E-mail with the tube number and
I'll check it against my list.  If I have it, it's yours for $4.00 a tube
plus shipping charges.



From [e-mail] Wed Jan 17 14:41:35 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsxfer.itd.umich.edu!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!am024
From: [e-mail] (Robert Thomas Jackson)
Newsgroups: rec.radio.amateur.homebrew
Subject: tuning in CW/SSB stations w/ AM only radio?
Date: 13 Jan 1996 04:55:07 GMT
Organization: The Greater Detroit Free-Net
Lines: 6
Message-ID: <4d7dvb$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


I seem to remeber a few posts a while back about being able to
tune in SSB stations with an AM radio (SW) by just running a
477 khz oscillator near it.... Is this true?  Do crystals run
down that low?  If so I could just build a VXO in that area and
be able to adjust it... Has anyone made this work?


From [e-mail] Wed Jan 17 14:41:37 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr6ip47.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Date: Sat, 13 Jan 1996 14:56:10 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 22
Message-ID: <[e-mail]>
References: <4d7dvb$[e-mail]>
NNTP-Posting-Host: usr6ip47.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4d7dvb$[e-mail]> [e-mail] (Robert
Thomas Jackson) writes:
>From: [e-mail] (Robert Thomas Jackson)
>Subject: tuning in CW/SSB stations w/ AM only radio?
>Date: 13 Jan 1996 04:55:07 GMT


>I seem to remeber a few posts a while back about being able to
>tune in SSB stations with an AM radio (SW) by just running a
>477 khz oscillator near it.... Is this true?  Do crystals run
>down that low?  If so I could just build a VXO in that area and
>be able to adjust it... Has anyone made this work?

The usual i-f is 455 KHz. Yes crystals can be had for this frequency. A vcxo
would probably have very limited tuning range, however. This scheme will work
after a fashion. The AM detector is used to mix the externally supplied
carrier (BFO) with the SSB signal. The problems include; getting the BFO to
i-f amplitude ratio correct, AGC system overload from the BFO, poor i-f
selectivity, etc.

Good luck.

Wes -- N7WS


From [e-mail] Wed Jan 17 14:41:38 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4d7dvb$[e-mail]>
Date: Sun, 14 Jan 1996 18:29:21 GMT
Lines: 32

In article <4d7dvb$[e-mail]> [e-mail] (Robert
Thomas Jackson) writes:
>
>I seem to remeber a few posts a while back about being able to
>tune in SSB stations with an AM radio (SW) by just running a
>477 khz oscillator near it.... Is this true?  Do crystals run
>down that low?  If so I could just build a VXO in that area and
>be able to adjust it... Has anyone made this work?

You *can* do this, though actually since the IF is 455 kHz, you'd
want your oscillator to operate on either 453 or 457 kHz depending
on whether you wanted to receive USB or LSB. There are serious
problems with this approach, however. The AM set uses an *envelope*
detector while a true SSB receiver will use a *product* detector.
With an envelope detector, you have to be *very* careful to have
just the right carrier reinsertion amplitude or severe distortion
will result. Since the required carrier amplitude varies with
the signal strength of the signals received, you need some way
to continuously vary this, and that's neither simple nor easy.

A much better approach is to build a product detector and go in
and add it to the AM receiver in place of the envelope detector
(a switch could be used to select the proper detector depending
on whether you want to receive AM or SSB). A product detector
is not a complex circuit, and can be built up on a small board
that can be tucked inside the radio.

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


From [e-mail] Wed Jan 17 14:41:39 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.dacom.co.kr!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: VCO power supply noise reduction
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]>
Date: Fri, 12 Jan 1996 18:03:29 GMT
Lines: 27

In article <[e-mail]> [e-mail] (Wes Stewart) w
rites:
>
>The capacitance multiplier idea may work sometimes, but without *very* carefu
l
>analysis, you might get into real trouble.

The electronic capacitance amplifier always works, but it doesn't
excuse one from good electronic practice. It is not a substitute
for RF bypassing. In fact, due to  the finite gain-bandwidth product
of the emitter follower stage, it is mainly a method to reduce
*low frequency* ripple in a DC voltage. It does that quite well.
Good practice tells us to use *both* a large capacitance and a
small value capacitance to bypass 3 terminal regulators. The
former for low frequency bypassing, and the latter for high
frequency bypassing. The electronically amplified capacitor
can allow us to use a physically smaller capacitor for the
low frequency bypassing, but it doesn't free us from the need
to also supply a high frequency bypass for stages prone to
parasitic oscillation, like the above mentioned 3 terminal
regulator.

Gary

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


From [e-mail] Wed Jan 17 14:41:40 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: Sat, 13 Jan 1996 07:53:39 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 63
Message-ID: <4d7ogd$[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: usr5ip19.azstarnet.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Gary Coffman) wrote:

>In article <[e-mail]> [e-mail] (Wes Stewart)
writes:
>>
>>The capacitance multiplier idea may work sometimes, but without *very* caref
ul
>>analysis, you might get into real trouble.

>The electronic capacitance amplifier always works, but it doesn't
>excuse one from good electronic practice. It is not a substitute
>for RF bypassing. In fact, due to  the finite gain-bandwidth product
>of the emitter follower stage, it is mainly a method to reduce
>*low frequency* ripple in a DC voltage. It does that quite well.
>Good practice tells us to use *both* a large capacitance and a
>small value capacitance to bypass 3 terminal regulators. The
>former for low frequency bypassing, and the latter for high
>frequency bypassing. The electronically amplified capacitor
>can allow us to use a physically smaller capacitor for the
>low frequency bypassing, but it doesn't free us from the need
>to also supply a high frequency bypass for stages prone to
>parasitic oscillation, like the above mentioned 3 terminal
>regulator.

>Gary

Included in my very careful analysis caveat is the effect of
additional capacitance on the emitter of the
emitter-follower.

Some other thoughts on the "If some are good, more are
better" bypassing schemes.  One should also consider that
most "low-frequency" capacitor types have fairly low
self-resonant frequencies (SRFs).  Above SRF, the capacitor
looks inductive.  If this "inductor" is shunted with the
appropriate value "high-frequency" bypass, it is possible to
get a nice high impedance parallel tuned circuit right where
you want the exact opposite.  Sprinkle in a few more caps
and you can have even more fun.  For instance:

Some years ago, I was approached by a new college grad who
was trying to solve a problem with crosstalk in an i-f
amplifier used in a monopulse radar. This consisted of three
amplitude and phase-matched amplifiers that used matched
everything; FET amplifiers, PIN diodes for AGC and matched
Schottky diode bridges for blanking.  Each amplifier board
was installed in a fully shielded machined housing with
feed-thru caps on each power supply and AGC lead.  The wires
to these caps were daisy-chained from one to the next. The
problem was that despite all the precautions, there was
inadequate isolation between channels and poor AGC tracking.
Weeks were spent looking at device matching, grounding, etc.

I suggested to this young man that he locate a grid dip
meter and look for resonances in the decoupling circuit.
 ( His response was, "What's a grid dip meter", but that's
another story). Sure enough, there was a resonance between
the connecting lead lengths and the capacitors close to the
i-f.  A change in wire dress and feed-thru capacitor values
moved the frequency enough to eleminate the problem.  Here
was a case where everything was done "right" and we still
had a problem.

73, Wes



From [e-mail] Wed Jan 17 14:41:42 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr3ip36.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: Sat, 13 Jan 1996 09:22:40 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 16
Message-ID: <[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]> <[e-mail]>
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X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <[e-mail]> [e-mail] (Gary
Coffman) writes:
>From: [e-mail] (Gary Coffman)
>Subject: Re: VCO power supply noise reduction
>Date: Sat, 13 Jan 1996 10:03:03 GMT
[snip]

>... A moment's work with a butane soldering iron,
>and the suck-out magically disappeared. Case closed,
>collect fee. :-)

Good work! Except what's an STL?

I'm on straight salary, although the way the
defense biz is these days, it has a negative slope :((

73, Wes


From [e-mail] Wed Jan 17 14:41:43 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: VCO power supply noise reduction
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]> <[e-mail]> <[e-mail]>
Date: Sat, 13 Jan 1996 17:57:47 GMT
Lines: 22

In article <[e-mail]> [e-mail] (Wes Stewart) w
rites:
>In article <[e-mail]> [e-mail] (Gary
 Coffman) writes:
>>... A moment's work with a butane soldering iron,
>>and the suck-out magically disappeared. Case closed,
>>collect fee. :-)
>
>Good work! Except what's an STL?

Studio to Transmitter Link.

>I'm on straight salary, although the way the
>defense biz is these days, it has a negative slope :((

Yeah, I heard that. The corporate jungle isn't quite so
secure these days.

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


From [e-mail] Wed Jan 17 14:41:44 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.netnet.net!news.inc.net!news.sol.net!spool.mu.edu!howland.reston.ans.net!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: VCO power supply noise reduction
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]>
Date: Sat, 13 Jan 1996 10:03:03 GMT
Lines: 45

In article <4d7ogd$[e-mail]> [e-mail] (Wes Stewart) wr
ites:
>I suggested to this young man that he locate a grid dip
>meter and look for resonances in the decoupling circuit.
> ( His response was, "What's a grid dip meter", but that's
>another story). Sure enough, there was a resonance between
>the connecting lead lengths and the capacitors close to the
>i-f.  A change in wire dress and feed-thru capacitor values
>moved the frequency enough to eleminate the problem.  Here
>was a case where everything was done "right" and we still
>had a problem.

Sure, you bet, the non-obvious can bite you if you aren't
careful. That doesn't detract from the value of the
capacitance multiplier technique in general, however.
It just means you have to use it in conjunction with
the care you'd use with any other method.

Since we're into war stories, I'll relate a recent incident
which may highlight overlooking the obvious. I was called
in to aid the chief engineer of a local television station
with a problem he was having at his transmitter site. The
symptom was very low chroma on the transmitted signal. He
had swept the transmitter, and its response was fine. He
had checked the output of the STL, it was fine. He had
bypassed all the terminal equipment between the microwave
and the transmitter, no help. He was stumped.

I took one look and immediately saw the problem. The cable
carrying the signal from the STL to the transmitter was
roughly 1/4-wave at 3.58 MHz. Obviously it was acting as a
suck-out trap. The only way that could happen would be for
a ground to be broken. Sure enough, in the STL frame, the
ground trace to the BNC was cracked. Thanks to good plant
grounding, no hum was introduced that would have given
the problem away, but the coax was acting as a trap for
the 3.58. A moment's work with a butane soldering iron,
and the suck-out magically disappeared. Case closed,
collect fee. :-)

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


From [e-mail] Wed Jan 17 14:41:45 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail
From: [e-mail] (Garry Foster)
Subject: Re: VCO power supply noise reduction
Message-ID: <1107cc$[e-mail]>
Date: Tue, 16 Jan 1996 13:18:25 GMT
Reply-To: [e-mail]
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]> <[e-mail]> <[e-mail]>
X-Newsreader: Forte Free Agent 1.0.82
Lines: 21

[e-mail] (Wes Stewart) wrote:

>In article <[e-mail]> [e-mail] (Gary
 Coffman) writes:
>>From: [e-mail] (Gary Coffman)
>>Subject: Re: VCO power supply noise reduction
>>Date: Sat, 13 Jan 1996 10:03:03 GMT
>[snip]

>>... A moment's work with a butane soldering iron,
>>and the suck-out magically disappeared. Case closed,
>>collect fee. :-)

>Good work! Except what's an STL?

>I'm on straight salary, although the way the
>defense biz is these days, it has a negative slope :((

>73, Wes






From [e-mail] Wed Jan 17 14:41:47 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: Tue, 16 Jan 1996 10:00:51 -0800
Organization: American Radio Relay League
Lines: 15
Message-ID: <[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]>
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Wes Stewart wrote:
> i-f.  A change in wire dress and feed-thru capacitor values
> moved the frequency enough to eleminate the problem.  Here
> was a case where everything was done "right" and we still
> had a problem.

How would you attack the problem in a "DC to daylight"
amplifier with no "safe frequencies" to move the
resonances?

I've been known to use resistive loading in the bias
lines of low power amplifiers, but this isn't always
practical.

Zack KH6CP/1


From [e-mail] Wed Jan 17 14:41:48 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip10.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: Tue, 16 Jan 1996 19:59:27 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 48
Message-ID: <[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]> <[e-mail]>
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X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <[e-mail]> Zack Lau <[e-mail]> writes:
>From: Zack Lau <[e-mail]>
>Subject: Re: VCO power supply noise reduction
>Date: Tue, 16 Jan 1996 10:00:51 -0800

>Wes Stewart wrote:
>> i-f.  A change in wire dress and feed-thru capacitor values
>> moved the frequency enough to eleminate the problem.  Here
>> was a case where everything was done "right" and we still
>> had a problem.

>How would you attack the problem in a "DC to daylight"
>amplifier with no "safe frequencies" to move the
>resonances?

That's a lot of octaves! (Or decades even).

>I've been known to use resistive loading in the bias
>lines of low power amplifiers, but this isn't always
>practical.


Well, as you already know, ferrites are probably the best answer. You can get

a |Z| real (resistive) part that is useful over a fairly wide frequency range
while not presenting a DC resistance. Even if there are resonances somewhere,
the Q is lowered and this often helps.

The point I was trying to make was that the shotgun and more-the-merrier
approaches often work, but not always. In ham stuff, this is often OK, because

we build only one of something and can always fiddle with it. The problems
arise when you want to build a bunch of something and normal tolerances bite
you.

As designer for the masses, you must be aware of this.

Even in aerospace, we historically have thrown money at things by screening
hardware (as the VCO vendor had done with the regulator chip, BTW) to improve
yield and reduce variability. Now days, we are being forced to use
Commercial-Off-The Shelf (COTS) stuff.  This is for two reasons: one, the
customer (that's you, Taxpayer) doesn't want the finest anymore and 2, no
vendors want to put up with the paperwork necessary to build a handfull of
parts, when they can build millions for other people. This scares the hell out

of me, but nobody asked me.

>Zack
KH6CP/1

Regards, Wes -- N7WS


From [e-mail] Wed Jan 17 14:41:49 1996
Path: news.epix.net!news.sprintlink.net!news2.whytel.com!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!news.ultranet.com!webb
From: [e-mail] (Spencer & Chandra Webb)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: Repair Tech for SINGER FM-10CS
Date: Mon, 15 Jan 96 03:35:03 GMT
Organization: UltraNet Communications, Inc.
Lines: 9
Message-ID: <4dcmas$[e-mail]>
NNTP-Posting-Host: webb.ultranet.com
X-Newsreader: News Xpress Version 1.0 Beta #4

If you know what a SINGER FM-10CS is, and you have repaired them before, I
would like to speak with you.  I have one that is need of some care.  It is
relatively recently calibrated, but has developed problems.  I would like to
use this gear in amateur work.

E-mail to [e-mail]

-Spencer
WA2BSR


From [e-mail] Wed Jan 17 14:41:50 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!wizard.pn.com!news.zeitgeist.net!oracle.damerica.net!usenet
From: [e-mail] (Dave Austin)
Newsgroups: rec.radio.amateur.homebrew
Subject: XLR balanced to non ckt. is it easy ??
Date: 14 Jan 1996 19:06:03 GMT
Organization: community.net
Lines: 7
Message-ID: <4dbk6s$[e-mail]>
NNTP-Posting-Host: n110.napa.community.net
X-Newsreader: WinVN 0.92.6+

Need to convert XLR (cannon)  balanced inputs to standard line input.   Do I j
ust put
one end to ground and use the other?   XLR is a balanced audio input (for lowe
r noise)
Not sure of  Z in ckt.

Thanks

Dave


From [e-mail] Wed Jan 17 14:41:51 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!oracle.damerica.net!usenet
From: [e-mail] (Dave Austin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: XLR balanced to non ckt. is it easy ??
Date: 15 Jan 1996 06:23:12 GMT
Organization: community.net
Lines: 29
Message-ID: <4dcrsg$[e-mail]>
References: <4dbk6s$[e-mail]> <[e-mail]>
NNTP-Posting-Host: n118.napa.community.net
X-Newsreader: WinVN 0.92.6+


>With any transformer-input circuit (many pro balanced ins still use
>transformers), you should indeed ground one side of the balanced line, and

cut cut

>
do you no good in some cases.
>
>
>: John Seboldt  [e-mail]  / CW:  It don't mean a thing
>:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
>:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
>> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html <
>


Thanks.  I found out much about XLR in searching the net.   Thanks for your
info.  Found some good ref material form  RANE company on the net.

I have tried some things and below is what works ok.   Xfmrs are not needed fo
r
high level stuff.  Just mikes and other low level devices.
The item under repair is a Sony DAT deck.  2300.   Now I some in and outs to
start my repair.

Thanks much.
Dave
KD6BYV



From [e-mail] Wed Jan 17 14:41:52 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: XLR balanced to non ckt. is it easy ??
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4dbk6s$[e-mail]>
Date: Mon, 15 Jan 1996 15:42:10 GMT
Lines: 28

In article <4dbk6s$[e-mail]> [e-mail] (Dave Austin
) writes:
>Need to convert XLR (cannon)  balanced inputs to standard line input.   Do I
just put
>one end to ground and use the other?   XLR is a balanced audio input (for low
er noise)
>Not sure of  Z in ckt.

Balanced XLR *is* standard, it's those funny phone jacks that are
non-standard. :-)

For microphone level (-55 dbm), the impedance is 150 ohms. For line
level (used to be +8 dbm but the industry is switching to +4 dbm)
the impedance is 600 ohms.

You don't want to destroy the system balance by grounding one of
the pair. You'll have hum pickup and other nasties. Standard
transformer adaptors are available, XLR on one end, transformer
in the middle, and 1/4 inch phone plug on the other. (Or sexed
vice versa for use on the other end of the line.)

If you're going into a high impedance unbalanced input, there are
adaptors with a suitable step up ratio in the transformer, otherwise
the transformer is just 1:1. It's a balun!

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


From [e-mail] Wed Jan 17 14:41:53 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: XLR balanced to non ckt. is it easy ??
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4dbk6s$[e-mail]> <[e-mail]>
Date: Mon, 15 Jan 1996 16:18:37 GMT
Lines: 50

In article <[e-mail]> [e-mail] (John Seboldt)
writes:
>Surprisingly, you may not actually have a balanced input even with XLR
>connectors -- I have a Yamaha board at work like this where the balanced
>transformers are an *option*, and not installed.
>
>If it's NOT a transformer input, you should do what gives you best
>results:  just feed from ground to one of the balanced legs.  In this
>case, there's an active differential input, and grounding one side will
>do you no good in some cases.

That's because the differential pair input *is* balanced. The only
reason you'd add the optional transformers in this case would be
if you needed to break the DC continuity between the board and a
distant piece of equipment that may not share common power (otherwise
you'd get a nasty ground loop), or because the distant equipment may
need phantom power fed down the cable. Unbalanced inputs have one side
grounded *internally*, balanced inputs don't. The presence or absence
of a transformer doesn't necessarily determine whether you're dealing
with balanced or unbalanced audio.

Pin 1 of the XLR is *shield* ground. You may not want to connect this
at both ends, even in balanced systems, because it can cause a frame
to frame ground loop. Grounding it only at the console end (or better
at the patch field) is usually best.

Pins 2 and 3 are the hot balanced pair, which is which doesn't matter
except for phasing. Traditionally, pin 2 gets the red wire and pin 3
gets the black, but as long as you wire both ends the same, it won't
matter (until somebody else has to come along later and repair one
end, then he'll probably wire it standard and you'll have a phase
reversal).

With the 1/4 inch plugs, the tip is always hot and the ring is
ground (which doubles as the shield connection). Obviously you
can't isolate ground with this type connection, and ground loops,
hum pickup, and RF pickup (at a radio station) will be commmon
and infuriating problems. The solution, of course, is to insert
a 1:1 transformer at the unbalanced end *before* the equipment
connection. This offers DC isolation, breaking the ground loop
and allowing you to single point the shield.

These *baluns* are standard off the shelf items from any professional
audio supplier.

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


From [e-mail] Wed Jan 17 14:41:55 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!hodes.com!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: Re: XLR balanced to non ckt. is it easy ??
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4dbk6s$[e-mail]> <[e-mail]>
Date: Mon, 15 Jan 1996 19:31:22 GMT
Lines: 19
Sender: [e-mail]

[e-mail] (Gary Coffman) writes:

>For microphone level (-55 dbm), the impedance is 150 ohms. For line
>level (used to be +8 dbm but the industry is switching to +4 dbm)
>the impedance is 600 ohms.

Not quite, Gary... in the old days it *was* a matched 600 ohm ideal...
today it's "lowest possible source impedance, highest possible load
impedance" for balanced line level.  Leads to a lot of confusion when
defining dBm in audio practice, to say the least.

But this ain't ham homebrew, unless we're talking' interfacing old radio
consoles to AM transmitters modified for 160 meters ...

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html <



From [e-mail] Wed Jan 17 14:41:55 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.nrv.net!usenet
From: [e-mail] (Mike)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: XLR balanced to non ckt. is it easy ??
Date: 15 Jan 1996 18:01:45 GMT
Organization: NRVnet Inc.
Lines: 16
Message-ID: <4de4q9$[e-mail]>
References: <4dbk6s$[e-mail]>
NNTP-Posting-Host: port-15.server1.nrv.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

In article <4dbk6s$[e-mail]>, [e-mail]
says...
>
>Need to convert XLR (cannon)  balanced inputs to standard line input.
Do I just put
>one end to ground and use the other?   XLR is a balanced audio input
(for lower noise)
>Not sure of  Z in ckt.
>
>Thanks
>
>Dave

I use the Henry Matchbox that converts it both ways although you can
build one quite easy with opamps.



From [e-mail] Wed Jan 17 14:41:56 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!oracle.damerica.net!usenet
From: [e-mail] (Dave Austin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: XLR balanced to non ckt. is it easy ?? IT IS.
Date: 15 Jan 1996 06:27:44 GMT
Organization: community.net
Lines: 16
Message-ID: <4dcs50$[e-mail]>
References: <4dbk6s$[e-mail]> <[e-mail]>
NNTP-Posting-Host: n118.napa.community.net
X-Newsreader: WinVN 0.92.6+


Woops , forgot to list what works.


RCA unbalanced output (high level, standard stereo stuff )
to XLR 3 wire balanced input device.  (DAT deck in this case)

RCA                                             XLR
center pin  ------------------------   pin 2
outside pin ------------------------  pin 3
                    ---shield of wire --  pin 1



Dave
KD6BYV


From [e-mail] Wed Jan 17 14:41:57 1996
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From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Xpert Needed:Zener Diodes --- Can you make what you dont have?
Date: 11 Jan 1996 21:56:00 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 36
Sender: [e-mail]
Message-ID: <4d4ik0$[e-mail]>
Reply-To: [e-mail] (PFZouave)
NNTP-Posting-Host: newsbf02.mail.aol.com

Question: Im looking at a reset circuit (suggested by Microchip, the
manufacturer of the 16C74 microcontroller) which is build around a PNP
transistor,  three resistors, and a zener diode. Basically, the zener is
set up with a series resistor to form a voltage reference of sorts. It
feeds the transistor, which in turn can activate the reset pin on the
processor.

The idea is this: If Vsuppy falls below the zener voltage + 0.7 volts
(drop across the transistor, I presume), then the transistor will shut off
and a pull-down resistor will yank the reset line to ground and reset the
processor. So far so good.

My problem is this: The processor is spec'd to work down to 2.5 volts. If
I add a safety margin and say the minimum before reset should be 3.o
volts, 3 - 0.7 leaves me with a required zener voltage of 2.3 volts. I
have several catalogs laying around here, and can't find any zeners less
than 3 volts.

Can I synthesize the breakdown characteristics of a reverse biased 2.3
volt zener by replacing it with three *forward* biased switching diodes
(like the 1n4148?). If the drop across each switching diode is, say 0.7 or
0.8 volts, then the total drop across the string should be 2.4 ----- very
close to the zener voltage id like to see.

Will this work? What practical problems are there with this approach? How
consisent is the forward drop of a particular line of switching diodes
from batch to batch?

Please email any thoughts you might have, as my access to newsgroups is
often less than reliable. Pete
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Wed Jan 17 14:41:58 1996
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From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have?
Date: 15 Jan 1996 23:04:39 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 20
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References: <[e-mail]>
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Mark Zenier ([e-mail]) wrote:

: The TL431 shunt regulator IC (also called a programmable zener) is
: good down to 2.5 volts.  It doesn't like much parallel capacitance,
: but otherwise looks like a zener.

I recently discovered the "It doesn't like much parallel capacitance"
thing, but it's really that it doesn't like a moderate amount of
capacitance:  it's stable for large capacitance (4.7uF and above)
and small (4.7nF and below) but potentially not in between.  The region of
stability is shown in the TI databook.  It's least stable for lowest
voltage (Vka = Vref) and low currents (the capacitances given above), and
unstable at 15 volts only at low current from about .06uF to 1uF.
Note that type of capacitor and lead lengths (parasitic inductance and
resistance) may affect the region of stability.

--
Cheers,
Tom
[e-mail]


From [e-mail] Wed Jan 17 14:42:00 1996
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From: [e-mail](Dale A. Keltie )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have?
Date: 15 Jan 1996 22:16:33 GMT
Organization: Netcom
Lines: 37
Message-ID: <4dejo1$[e-mail]>
References: <4d4ik0$[e-mail]> <4d4pdu$[e-mail]>
NNTP-Posting-Host: ix-ren-nv1-12.ix.netcom.com
X-NETCOM-Date: Mon Jan 15  2:16:33 PM PST 1996

In <4d4pdu$[e-mail]> [e-mail] (qrk) writes:
>
>[e-mail] (PFZouave) wrote:
>
>>Question: Im looking at a reset circuit (suggested by Microchip, the
>>manufacturer of the 16C74 microcontroller) which is build around a
PNP
>>transistor,  three resistors, and a zener diode. Basically, the zener
is
>>set up with a series resistor to form a voltage reference of sorts.
It
>>feeds the transistor, which in turn can activate the reset pin on the
>>processor. [stuff deleted]
>
>Your best bet for a reliable reset circuit is something like the Maxim
>MAX704T/S/R or the reset chip.  The T/S/R suffix is the reset voltage
>(3.06, 2.91, 2.61 respectively).  Don't use the plain MAX704, it
>resets at 4.65 volts. The one you describe has problems with temp
>drift and good reliable operation when conditions become marginal or
>you have a funky power supply during turn-on.  Maxim and others have a
>whole bunch of microprocessor reset circuits which work better than
>any of the popular discrete designs.  I think the cost is about $5.00
>each.
>
>
>
>-
>Mark Chun  |  [e-mail]  |  Santa Barbara, CA
>

Another possible source for these types of circuits is:
Dallas Semiconductor
4350 Beltwood Pkwy. S.
Tel: [phone]

Regards, Dale



From [e-mail] Wed Jan 17 14:42:01 1996
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From: [e-mail] (qrk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have?
Date: Fri, 12 Jan 1996 04:53:24 GMT
Organization: Marginal
Lines: 24
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References: <4d4ik0$[e-mail]>
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[e-mail] (PFZouave) wrote:

>Question: Im looking at a reset circuit (suggested by Microchip, the
>manufacturer of the 16C74 microcontroller) which is build around a PNP
>transistor,  three resistors, and a zener diode. Basically, the zener is
>set up with a series resistor to form a voltage reference of sorts. It
>feeds the transistor, which in turn can activate the reset pin on the
>processor. [stuff deleted]

Your best bet for a reliable reset circuit is something like the Maxim
MAX704T/S/R or the reset chip.  The T/S/R suffix is the reset voltage
(3.06, 2.91, 2.61 respectively).  Don't use the plain MAX704, it
resets at 4.65 volts. The one you describe has problems with temp
drift and good reliable operation when conditions become marginal or
you have a funky power supply during turn-on.  Maxim and others have a
whole bunch of microprocessor reset circuits which work better than
any of the popular discrete designs.  I think the cost is about $5.00
each.



-
Mark Chun  |  [e-mail]  |  Santa Barbara, CA



From [e-mail] Wed Jan 17 14:42:02 1996
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have?
Date: 17 Jan 1996 03:10:27 GMT
Organization: Hewlett-Packard
Lines: 20
Message-ID: <4dhpb3$[e-mail]>
References: <4d4ik0$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
Mark Zenier <[e-mail]> wrote:
>in <4d4ik0$[e-mail]>, PFZouave wrote:
>: My problem is this: The processor is spec'd to work down to 2.5 volts. If
>: I add a safety margin and say the minimum before reset should be 3.o
>: volts, 3 - 0.7 leaves me with a required zener voltage of 2.3 volts. I
>: have several catalogs laying around here, and can't find any zeners less
>: than 3 volts.
>
>The TL431 shunt regulator IC (also called a programmable zener) is
>good down to 2.5 volts.  It doesn't like much parallel capacitance,
>but otherwise looks like a zener.

Good suggestion.  Let me add that the capacitance requirement is actually
EITHER less than 1000 pF. OR MORE than 4.7 uF., according to the
data sheet.  I found that the 4.7 uF. MUST be a tantalum not a ceramic,
or it will oscillate.  It depends on the ESR of the tantalum for stability.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Mon Jan 22 19:57:25 1996
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From: Tom Pfaffenbach <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Balun Help
Date: 22 Jan 1996 16:02:57 GMT
Organization: Delco Electronics
Lines: 5
Distribution: usa
Message-ID: <4e0cfh$[e-mail]>
References: <[e-mail]>
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Try 11 trifilar turns #14 formvar or TFE insulated wire. Connect the turns in
series. Ground at
the far end of the first turn. Balanced output at bottom and 2/3 tap. Unbalanc
ed feed at top (to
ground). Generally a 2.4 " dia Q-2 material 1/2 " thick is used, but your 1.12
5" thick material
probably won't saturate at 1000w.



From [e-mail] Mon Jan 22 19:57:28 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: dummy load?
Date: 17 Jan 1996 12:04:26 -0500
Organization: # Sirius Cybernetics, Sirius City branch
Lines: 5
Message-ID: <4dja6q$[e-mail]>
NNTP-Posting-Host: bashful.einsteininfo.com
X-Newsreader: TIN [version 1.2 PL2]

Could someone either send me,or direct me to a site where I might find plans
to construct an inexpensive dummy load (50 ohm).I don't need it to handle
more than 10 to 15 watts maximum.Thanx!
                     [e-mail]



From [e-mail] Mon Jan 22 19:57:29 1996
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From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: dummy load?
Date: Thu, 18 Jan 1996 00:19:14 -0700
Organization: JP Accelerator Works, Inc.
Lines: 36
Message-ID: <[e-mail]>
References: <4dja6q$[e-mail]>
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To: [e-mail]

[e-mail] wrote:
>
> Could someone either send me,or direct me to a site where I might find plans
> to construct an inexpensive dummy load (50 ohm).I don't need it to handle
> more than 10 to 15 watts maximum.Thanx!
>                      [e-mail]

Cheap depends on your ability to find resistors.  I once made a
dummy load by paralleling thirty 1500 ohm 2 W carbon composition
resistors.  I connected 10 in parallel side-by-side with a 12
guage (or so) wire along the grounded side.  I then took three
sets of 10 and connected them altogether, in a "Y"
configuration, along a common #12 wire which went to the center
of a coax connector. The three wires at the other end of the
resistors were connected to the body of the connector.  It worke
OK at 50 MHz, although it had some noticeable reactive component
at the frequency. These resistor now run $2.69 each with minimum
purchase 25 from Newark.  So if you go this route it will only
be economical if you can find a cheap source of resistors.  Of
course you can use differing numbers of resistors, different
resistance, differenct wattage.  The point is if you need a load
at 50 MHz or below you can get away with a lot.  Probably a
smaller one might even be adequate on 144 MHz.

Or, find a Heath Cantenna somewhere.  They were the size of a 1
gallon paint can and would meet your requirements without the
oil, depending on what frequency your are planning to use.

de K9GXC, Jim


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


From [e-mail] Mon Jan 22 19:57:30 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Electonic flash unit problem
Date: Sun, 14 Jan 1996 16:16:17 GMT
Organization: West Coast Online's News Server - Not responsible for content
Lines: 30
Message-ID: <4dba3d$[e-mail]>
References: <4d3541$[e-mail]>
NNTP-Posting-Host: 206.99.115.35
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.misc:97074 rec.radio.amateur.homebrew:12810

Its possible the tube is bad - However are you sure the trigger is
operating - the you might see if you can draw an arc from the trigger
transformer (4kV) if you trigger the flash.

Replacement tubes are usually available - but not cheap. In the US
Mouser Electronics sells them...

Also you might want to list on the rec.photo.misc ----- or other photo
groups
Noland
[e-mail] (DCG Mktg Docmnt (Ivrea)) wrote:


>
>
>I have an electronic flash unit purchased in 1970. After being unused for
>many years, I find that now it does not function correctly. The lamp is
>powered by 250 Vcc and the flash is triggered by a pulse. I have
>checked the capacitor, which is in good condition. Has the lamp failed
>through again?? Does anybody have the answer?
>
>
>
>
>
>
>
>




From [e-mail] Mon Jan 22 19:57:31 1996
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From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Grapefruit powered XMTR?
Date: 17 Jan 1996 14:24:10 GMT
Organization: Netcom
Lines: 25
Message-ID: <4dj0qa$[e-mail]>
References: <[e-mail]> <4di8v6$[e-mail]>
NNTP-Posting-Host: pax-ca23-16.ix.netcom.com
X-NETCOM-Date: Wed Jan 17  6:24:10 AM PST 1996

In <4di8v6$[e-mail]> [e-mail] (Roy Lewallen)
writes:

>
>Try "Lemonized QSO" by Bob Culter, N7FKI and Wes Hayward, W7ZOI
>in QST, March 1992, p. 18. I dunno if I'd power it with a
>grapefruit, though, it might put the squeeze on the transistor.
>
>73,
>Roy Lewallen, W7EL
>

Then again, for long-winded QSO's I'd use a grapefruit.  After all,
it's well known that a grapefruit will supply more juice...


>(Yes, I know what I'm probably starting here, and apologize in
>advance. . .)
>

Apology insufficient.  Please send money.


- Jeff, WA6AHL



From [e-mail] Mon Jan 22 19:57:33 1996
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Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <[e-mail]>
Date: Sun, 21 Jan 1996 07:25:00 -0500
Organization: =ACE= ONLINE [phone]
Subject: Re: Help needed repairing
Message-ID: <[e-mail]>
Lines: 46

Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
"mail sometimes bounces here, please resend if needed!"

Hello Leon. Perchance could you supply me the address and
phone number(s) for Cricklewood Electronics?
R.S.V.P.
I keep  a list of US/Canada/UK suppliers of parts and kits for
amateur radio called MEGALIST.TXT and I could add them to the list.
If you can't find it locally, try these:
Updated copies downloadable from BBSes at:         [phone]
[phone],  [phone],  [phone],  [phone]
FTP:  [e-mail]
FTP: [e-mail]
WWW:  http://qrp.cc.nd.edu/QRP-L/index.html
URL: http://www.nd.edu/~shideg/

LE>> I am not well versed in electronics repair and am hoping that someone can
LE>> put in the right direction. Should these transistors be replaced? If so,
LE>> would they be commonly available here in Canada. (OC171) If not, then
LE>> what would be a suitable substitution? I've noticed that these
LE>> transistors have 4 leads. The fourth is labeled "S" and always goes to
LE>> ground. Is this akin to grounding the case of the transistor?
LE>> Looking forward to hearing from anyone who may be able to help.
LE>> Please email. Thanks in advance.
LE>> Paul.

LE>The OC171 was made by Mullard (part of Philips) something like 30 years
LE>ago. I used the similar OC170 in a simple reflex Rx in the 60s. You'll
LE>probably have trouble finding them in Canada. If you need to replace
LE>them, I can think of one or two places here in the UK that *might* have
LE>them, like Cricklewood Electronics. The 170 was an RF amp, and the 171 an
LE>IF amp, as I recall. Both were germanium, of course. The 4th lead was a
LE>screen and was connected to the case.

LE>73, Leon
LE>--
LE>Leon Heller, G1HSM                | "Do not adjust your mind, there is
LE>E-mail [e-mail]  |  a fault in reality": on a wall
LE>Phone: [phone]         |  many years ago in Oxford.

I am G3XLQ/W3 (!)
[e-mail]
---
 ■ SLMR 2.1a ■



From [e-mail] Mon Jan 22 19:57:34 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 16 Jan 1996 10:41:21 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <4dggv1$[e-mail]>
References: <thomas.g.booth-150196192610@160.205.101.24>
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X-Newsreader: AOL Offline Reader

Hi Gary,
>As I noted, core saturation plays no part with 1 kV/nS pulses. They
>*capacitively* couple between the transformer windings, unless you
>use a ferroresonant or Faraday shielded transformer of course. Note
>that's *nanosecond* not *millisecond*. Transients almost by definition
>are *very* fast pulses. They usually don't pack a lot of energy (which
>is good or little bitty MOVs would be of no value), and don't do the
>damage themselves in line operated equipment. What they do is serve as
>junction puncturers or "ignition" sources. It's the ordinary line current

>that then does the damage by following the path created by the transient.
>

If the pulse is capacitively coupled, how does the turns ratio step it up?


73 Tom


From [e-mail] Mon Jan 22 19:57:35 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 17 Jan 1996 14:09:21 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 12
Sender: [e-mail]
Message-ID: <4djhh1$[e-mail]>
References: <4dgqha$[e-mail]>
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In article <[e-mail]>, [e-mail]
(Gary Coffman) writes:

>It doesn't, nor does it need to, a megavolt transient is quite sufficient
>in itself.
>
>

How does a megavolt ultra short rise time transient make it past the line
bypass caps, terminal blocks outlet, fuse box and so on?

73 Tom


From [e-mail] Mon Jan 22 19:57:36 1996
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From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Followup-To: rec.radio.amateur.homebrew
Date: 16 Jan 1996 03:03:45 GMT
Organization: A Turbulent One
Lines: 9
Distribution: usa
Message-ID: <thomas.g.booth-150196192610@160.205.101.24>
References: <4d96v0$[e-mail]> <4danp1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 160.205.101.24

FWIW the trademark for TransZorb (this is the correct spelling and use of
upper and lower case characters) is held by General Semiconductor
Industries, Inc.  An alternate source of silicon transient voltage
suppressors is Microsemi Corporation - the trademark for their product line
is TAZ.

TGB

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


From [e-mail] Mon Jan 22 19:57:37 1996
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From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to add battery capacity to a vehicle?
Date: Tue, 16 Jan 96 19:33:11 GMT
Organization: TSE Systems
Lines: 40
Message-ID: <4dgu7i$[e-mail]>
References: <[e-mail]> <[e-mail]>
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X-Newsreader: News Xpress Version 1.0 Beta #4

In article <[e-mail]>,
   Jay Wicklund <[e-mail]> wrote:
[...]
>When I bought my truck it had two batteries installed as part of
>a "camper" package.  One battery is strictly for the engine, the
>second battery powers the camper and is disconnected from the
>truck battery when the engine is off.  When the engine is
>running both batteries charge.  There is a module that controls
>the interconnect between the batteries;  I don't know if it is
>any more than a simple relay.  It may or maynot include some
>form of current limiting.

The most common method of doing this is a device called a "battery
isolator", consisting of two power diodes on a heat sink.  It has three
terminals: Alternator, Battery 1, and Battery 2.  The internal wiring is:

                |---->|---- Battery 1
Alternator -----|
                |---->|---- Battery 2

When the engine is not running, the two batteries are isolated since one or
both of the diodes will be reverse-biased.  Thus the auxilary battery can
be run down without drawing any current from the engine battery.  When the
engine is running, power generated by the alternator forward-biases the
diodes and charges both batteries, giving preference to the one with a
lower voltage.  Eventually, both batteries will charge to the same voltage.
 Usually the vehicle's voltage regulator remains connected to the Battery 1
circuit, so the voltage at that battery is regulated, and the alternator
output voltage is able to rise to overcome the drop in the diode.  The
voltage available at Battery 2 is inherently also regulated, since the
voltage drop in the two forward-biased diodes is about the same.

Battery isolators are sold in different amperage ratings, or you can
homebrew one from two suitable diodes and a heat sink.  The diodes need to
be rated for the full output of the vehicle's alternator, which can be more
than 100 A in some cases.

-Mike KD4QDM




From [e-mail] Mon Jan 22 19:57:38 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!qmw!orac.sunderland.ac.uk!usenet
From: [e-mail] (JURGEN FECHNER)
Newsgroups: rec.radio.amateur.homebrew
Subject: Info needed on how to design UHF coils using pcb tracks instead of wire
Date: 22 Jan 1996 11:52:31 GMT
Organization: University of Sunderland
Lines: 5
Message-ID: <4dvtpv$[e-mail]>
NNTP-Posting-Host: j_fechner_home.sunderland.ac.uk
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.4

Is there anyone who can help me with some information about printed
inductors?

Jurgen



From [e-mail] Mon Jan 22 19:57:39 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 10 meter conversion info for Cobra 148gtl
Date: 18 Jan 1996 03:33:20 GMT
Organization: Netcom
Lines: 7
Message-ID: <4dkf20$[e-mail]>
References: <4djt6j$32v$[e-mail]>
NNTP-Posting-Host: ix-pon-mi3-11.ix.netcom.com
X-NETCOM-Date: Wed Jan 17  7:33:20 PM PST 1996


There is a guy in AZ somewhere that advertises a book called CB to 10
mtrs, I see the ad alot. I wrote for a catalog of his offerings about a
year ago and he seemed to have alot of conversion information. Check
the ham mags for his ad.

73, Tim


From [e-mail] Mon Jan 22 19:57:41 1996
Path: news.epix.net!news.sprintlink.net!news.wwa.com!news
From: Gary KF9CM [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need AA-size dummy cell/bridge
Date: 18 Jan 1996 11:37:09 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
Lines: 17
Message-ID: <4dlbd5$[e-mail]>
References: <4d2v4v$[e-mail]>
NNTP-Posting-Host: vh1-054.wwa.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)

>   [e-mail] (Krin135) writes:
>  Radio Shack used to include two dummy bridges with each of its CB walkie
>  talkies just for this purpose. Don't know if they still have them- my vote
>  would be for a brass nut and bolt combination that has been cut to the
>  right size.
>
>    "We must All hang together, else we most assuradly will Hang separately"
>                 Benjamin Franklin, 1776
>  Charles S. Krin, DO FAAFP KC5EVN
>
>>>>
Go down to your local auto parts store and buy a 5/16 stud of a proper length.
I think might fit the bill.


                                             Good luck....Gary KF9CM



From [e-mail] Mon Jan 22 19:57:42 1996
Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help Indentifying Transistor
Date: 22 Jan 1996 12:40:56 GMT
Organization: SRC
Lines: 11
Message-ID: <4e00lb$[e-mail]>
References: <4du6dd$[e-mail]>
NNTP-Posting-Host: wa1rhp.iii.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

Hi Thom
        The lead nearest the tab is the emitter, the lead farthest from
the tab is the collector, the lead in between is the base.
A 2N2222A is a better device, no one makes 2222's, only the A devices.
Any specifications book (Motorola, Harris, National) has a wealth of
information on transistors.  Also, check the web sites for these guys.

Tom
WA1RHP




From [e-mail] Mon Jan 22 19:57:43 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!psinntp!psinntp!psinntp!pipeline!news
From: [e-mail] (Dave Santoro)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Needed: Eggbeater Plans
Date: Tue, 16 Jan 1996 16:33:50 GMT
Organization: JRP Securities, Inc.
Lines: 12
Message-ID: <4dgk1d$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dsantoro.nyc.pipeline.com
Xref: news.epix.net rec.radio.amateur.homebrew:12784 rec.radio.amateur.antenna:18522

Am looking to homebrew an Eggbeater Antenna dor Sarex/Mir operation.
Can anyone point me to a site or file with plans?

Thanks, & 73,

_______________________________________________________________________
  David H. Santoro       |   [e-mail]    |  Amateur Radio
   Systems Analyst       | [e-mail]    |    Callsign
JRP Securities, Inc.     |    [e-mail]        |     N2VYP
-----------------------------------------------------------------------
                         *<Standard Disclaimers Apply>*



From [e-mail] Mon Jan 22 19:57:44 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!van-bc!news.cyberstore.ca!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.nd.edu!news.bsu.edu!figmnt.tayloru.edu!jhschutt
From: [e-mail] (John Robert Schutt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Pls Help With Keyer Circuit Question
Message-ID: <[e-mail]>
Date: 16 Jan 96 17:43:15 -0500
Organization: Taylor University
Lines: 33

Can you help a neophyte in electronics?  I built a keyer that I saw described
in the article "An Inexpensive Morse Code Keyer" which was published in 73
Amateur Radio Today in June 1995.  Here are the questions.

1.  Initially, one of the grounds was bad.  This could be due to a mistake mad
e
by a rookie.  But, maybe not.  Has anyone else built this circuit and had any
problems?
2.  Now that it works, the volume is barely audible.  Any idea what I shoul tr
y
to correct this?  Here are some options:
        a.  Would a bad 2N2222A cause this?  That's the amplifier transistor.
        b.  The parts list says to use a Radio Shack 273-091 Piezo Speaker.
The author says that this is a 1200 ohm speaker, but the RS 273-091B is a
3500 ohm speaker.  WOuld this cause the very low volume?
        c.  Am I correct in mounting the electrolytic cap with the - side
towards ground?  I thought so, but someone told me that the "curves" side of
teh symbol was the positive side.  Every reference that I have shows it to be
the negative side-- the side closer to the (-) of the battery (ie., ground.

I'd really like to hear the keyer.  I really appreciate your help.  Because ou
r
News server crashes regularly, e-mail replies are preferred.  THANKS.  I know
that it takes time and effort to reply to a post.

John KB9KSM


--
______________________________________________________________________________
_
John Robert Schutt                         /\         [e-mail]
Taylor University- Fort Wayne             //\\        [phone]
1025 W. Rudisill Blvd.                   ///\\\       FAX: [phone]
Fort Wayne, IN 46807                       ||
------------------------------------------------------------------------------
-



From [e-mail] Mon Jan 22 19:57:46 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!nntp1.jpl.nasa.gov!news.alt.net!news1.alt.net!news.aros.net!usenet
From: [e-mail] (Douglas L. Datwyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Antenna Tuner Kit-First Impressions
Date: 22 Jan 1996 13:15:27 GMT
Organization: ArosNet Inc.
Lines: 53
Message-ID: <4e02li$[e-mail]>
References: <1996Jan6.185503.8669@ohstpy> <4csf5c$[e-mail]>
NNTP-Posting-Host: anp17.aros.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <4csf5c$[e-mail]>, [e-mail] says...
>
>In article <1996Jan6.185503.8669@ohstpy>,
>[e-mail] (JIM GARLAND) writes:
>
>>My only quibble with the kit is the printed circuit board. The board
>itself
>>is
>>of high quality. It is double-sided, with thru-plated holes, green
>>solder-masking, and silk-screened component outlines shown in white. My
>>concern
>>about the board is that the large majority of the traces seem to be
>extremely
>>thin. I couldn't measure them, but I'd guess a maximum width of 10 mil,
>and
>>probably less, perhaps even 6-7 mil. (all the relay control lines are
>wired
>>this way.)  Further, the pad sizes seem too small
>>relative to the holes in the pad. I'm not an expert at PCB layout, but
>I'd
>>think that a pad should have a minimum of 10-15mil of metal around each
>hole.
>>The majority of holes on the board have significantly less metal than
>this.
>>In
>>fact, a majority of the holes were drilled slightly off-center in the
>pads,
>>so
>>that there is no metal at all on one side of the hole!
>>
>>
>
>Hi Jim, This sounds like the boards I get from out of house layout shops
>that never work with RF. That's too bad. Maybe you could point that out to
>the kit supplier, because your observations illustrate a big problem.
>Somewhere I heard the rhyme short and thick does the trick. I assume that
>meant RF traces.
>
>73 Tom

I hope I am happy when mine arrives. As for the short and thick, that depends
on the signal in RF. Some microwave circuits depend on "controlled" length and

thickness, though better called width here, since thick is the depth of the
copper clad. In my designs (I design electronics for a few paying customers),
width is important in power supply to reduce I-R losses, as well as some key
analog traces.

I will post as soon as I finish building my tuner to let others know what I
think of it.

Douglas L. Datwyler   WR7O
[e-mail]



From [e-mail] Mon Jan 22 19:57:47 1996
Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!usenet.eel.ufl.edu!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 15 Jan 1996 09:11:37 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 26
Sender: [e-mail]
Message-ID: <4ddnap$[e-mail]>
References: <4db7u4$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Glen,
In article <1f7cc$12f11.27a@NEWS>, [e-mail] (Glenn Thorn)
writes:
I wrote:
>>This is begining to sound like someone danced around the truth a bit in
>>the earlier replies.
you wrote:
>I fail to understand the statement.

Let me explain it then. Reading this thread, I first received the
impression there was no reason the code was omited other than space and a
lack of understanding people would be interested in it. I received the
impression QST omitted the flow chart basically on it's own.

As I understood your comments, you said the author was concerned about
"giving away two years of work to a manufacturer". That leaves me with the
impression the author's desire was to have the data left out.

If that was even part of the reason for the omission, then everyone should
have just said so instead of implying the omission was due to
forgetfulness or ignorance.

In my opinion, "protecting work" is a very poor reason to omit anything
from an friendly helpful educational article.

Tom


From [e-mail] Mon Jan 22 19:57:48 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!news.tacom.army.mil!news2.acs.oakland.edu!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom13!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: QST Automatic Tuner Article
In-Reply-To: Jay Craswell's message of 16 Jan 1996 20:02:41 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <4dh091$pvp$[e-mail]>
Date: Tue, 16 Jan 1996 23:29:57 GMT
Lines: 16

Given the response to me from LDG, I think they and the QST staff
misread the audience.  The flow chart and binary is available now, for
SASE and formatted PC 3 1/2" floppy, and the source will be available
when it's adequately commented.  I've got the flow chart already, and
suspect I could put the code into an 68HC811E2 (2K vs 512 bytes code
space on the A1) with no problem, right now.
I can also see why the QST staff didn't publish the flow chart.

There are going to be more articles for devices using the MC68HC11 from
Dwayne and LDG, with more information available.

The article caused me to do some research on the 'HC11, and I think
it's a cool IC with lots of potential for amateur radio projects.
Check out the HC11 FAQ available at rtfm.mit.edu under
sci.electronics, among other places.
73, doug


From [e-mail] Mon Jan 22 19:57:49 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (SMaas)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Questions on the nature of Hetrodyning/Spectrum Analyser guts
Date: 17 Jan 1996 14:19:04 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 20
Sender: [e-mail]
Message-ID: <4dji38$[e-mail]>
References: <4chl02$[e-mail]>
Reply-To: [e-mail] (SMaas)
NNTP-Posting-Host: newsbf02.mail.aol.com


Re:

> Why
>can't I run the LO at the frequency I'm interested in,
>slug the mixer output with some brutal filter that
>suffocates anything past a few Hz and accept the result
>as reflecting the RF energy at the frequency of
>interest?  (is it 'cos the output of the mixer is
>AC-coupled internal to the mixer? :( )

The problem is noise: you will get downconverted AM noise from the LO, and
you will have to deal with 1/f noise in the amplifiers following the
mixer. you will also need a mixer that has an IF response to DC. but lots
of mixers do this.

Finally, there are spurious responses and images that will cause trouble
at low IF frequencies.

Steve (W5VHJ)


From [e-mail] Mon Jan 22 19:57:50 1996
From: [e-mail] (ian simcock)
Subject: Radio circuit required
Newsgroups: rec.radio.amateur.homebrew
Summary:
Keywords:
Lines: 27
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]
NNTP-Posting-Host: eve.adam.com.au
Message-ID: <[e-mail]>
Date: 21 Jan 96 17:26:54 GMT
Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.mel.aone.net.au!eden.adam.com.au!not-for-mail

I'm hopeing that someone could point me to either
1) An Internet site with circuit diagrams
2) A book with appropriate circuits
3) A person who could design an appropriate circuit
4) A company that sells what I want.

What I need is a small radio that fits the following specs -
1) Any frequency (preferably an unlicenced peice of spectrum)
2) Digital transmition of 500 bytes per second
3) 200 meter range under bad indoor conditions
4) Digital tuning
5) Runs on 4-6 volts
6) Low power consumption
7) Rapid startup/shut down for the transmiter
8) 10 channels


If possible I'd like the following improvements
1) 1000+ bytes per second
2) 500+ meter range
3) Run on 3-6 Volts
4) 30+ channels
5) Able to easily transmit analogue (voice) signals

Thanks for reading this far.
I'll appriciate any help anyone can give me,
   Ian Simcock.


From [e-mail] Mon Jan 22 19:57:51 1996
From: [e-mail] (ian simcock)
Subject: Re: Radio circuit required
Newsgroups: rec.radio.amateur.homebrew
References: <[e-mail]>
Lines: 8
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]
NNTP-Posting-Host: eve.adam.com.au
Message-ID: <[e-mail]>
Date: 21 Jan 96 18:02:26 GMT
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.mel.aone.net.au!eden.adam.com.au!not-for-mail

Sorry about this, but as I kind of expected, I forgot something. Under
the list of things that would be nice but not essential I'd like to add
another item -
6) Separate transmitter/reciever i.e. Able to transmit and recieve at the
same time on different frequencies.

Thanks again all,
   Ian Simcock.


From [e-mail] Mon Jan 22 19:57:52 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!gatech!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio REPAIR resource?
Date: 17 Jan 1996 16:29:26 GMT
Organization: Los Alamos National Laboratory
Lines: 11
Message-ID: <4dj857$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)

Is there such a thing as a radio *repair* newsgroup ?
I am particularly interested in a schematic/service info for
a Uniden CR-2026 SW receiver at the moment.
--
|-------------------------------------------------------|
|Jim Devenport    WB5AOX                                |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|-------------------------------------------------------|




From [e-mail] Mon Jan 22 19:57:52 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!sol.ctr.columbia.edu!news.mindlink.net!agate!cocoa.brown.edu!news
From: [e-mail] (Brian R. Swann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Radio REPAIR resource?
Date: Fri, 19 Jan 1996 01:13:23 GMT
Organization: Brown University
Lines: 12
Message-ID: <4dmr7m$[e-mail]>
References: <4dj857$[e-mail]>
NNTP-Posting-Host: rnpc1.cs.brown.edu
X-Newsreader: Forte Free Agent 1.0.82

Jim Devenport <[e-mail]> wrote:

>Is there such a thing as a radio *repair* newsgroup ?
>I am particularly interested in a schematic/service info for
>a Uniden CR-2026 SW receiver at the moment.

Jim, try sci.electronics.repair

73,
Brian  WA1VUT




From [e-mail] Mon Jan 22 19:57:54 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Remote Operating of HF station (VHF or Telephone)?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Wed, 17 Jan 1996 18:45:25 GMT
Lines: 27

In article <[e-mail]> Butch Weber <[e-mail]
t.nm.kr> writes:
>Hello, I am looking for any information on remote operation of my HF rig.
>I have a Kenwood TS-440S/AT with a CL-36 with 40 meter attachment at
>work and live in an apartment. I know I have seen articles in the past
>about remote operations but I am in Korea and don't have access to all
>my past magazine articles. I am using a 486 DX2-66 and would like to
>interface the computer as well. I haven't seen anything on the Web that
>relates to remote operating. If there is and I missed it could someone
>please pass the information. Thanks,

QST just did a feature on this very subject. I'll just give a quick
condensed generic version. You need remote software for your PCs.
You can use PCAnywhere or Remote2 or something similar. These programs
let one computer control another just as if you were at the keyboard
and screen of the controlled computer. Now all you need is rig and
antenna control software. There are a number of packages to choose
from. You run that on the controlled PC, just as if you were sitting
at its console, and control the rig with the package. You'll need
a second phone line and a phone patch to get audio in and out of
the rig to you at home. That's it.

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


From [e-mail] Mon Jan 22 19:57:55 1996
Path: news.epix.net!uunet!in2.uu.net!news.mindspring.com!usenet
From: [e-mail] (Clay Whiffen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Toroid permeability ???
Date: Sun, 21 Jan 1996 19:07:39 GMT
Organization: MindSpring Enterprises, Inc.
Lines: 56
Message-ID: <4du2sc$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: user-168-121-82-155.dialup.mindspring.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Hugh Duff) wrote:



>Does anyone know how to measure the permeability/loss of a toroid core
>(without too much difficulty !) ?
>They are difficult to get locally ( I usually have to order them from
>Amidon in Cal.) but some surplus stores in Toronto have a wide
>assortment of bins of unmarked toroids. It would be a nice
>cost-effective altenative to having to order new ones if we knew what we
>had sitting at our doorstep.

>A friend on a local BBS originally posed this question to me...
>I couldn't really answer him ...I am also curious !
>I thought that winding some wire onto them and taking impedance
>measurements at various frequencies may work but how does one accomplish
>this ?

>Thanks..

>Hugh Duff  VA3TO  Toronto




>---
> ■ NFX v1.3 [000]
OK, I'll give it a try.  Measuring Permeability, Pb, isn't too
difficult but it requires measuring inductance.  I use a little unit
from Jan '81 QST that, in turn, needs a frequency counter.  So if you
have these then the easy way is probably to  measure the dimensions of
the core and find it in the Amidon catalog.  Then wind enough turns
to cover about 3/4 of the core; with ferrites probably about 10 turns
but more may be needed to get a good inductance measurement with
powered iron cores.  Measure inductance L in microhenries.  Then
calculate the ALratio by:  Alratio=L(uH)x10000/N▓  where N is the
number of turns.  (If you measure inductance in millihenries use:
ALratio=L(mH)x1000000/N▓) You can then go back to the Amidon catalog
and find the type of core closest to your unknown. .

I f  in Amidon you can't find a core of the size you are testing you
can calculate  Pb by:  Pb=L(uH)/(.0319xN▓xfactor) where:
factor=Hx(OD-ID)/(╢x(OD+ID)).  H is core height, OD is outside
diameter and ID is inside diameter.

The numbers you will get will not be exactly  the same as the Pb in
the catalog but the material types are sufficiently different that you
can make a pretty good guess.  (at least for the ferrites.)  To
identify powered cores exactly you need the loss data.

Loss data is more difficult to get. You need to be able to measure the
Q of the test windings.  I won't attempt to get into that here.

Good Luck OM, 73  Clay, KF4IX




From [e-mail] Mon Jan 22 19:57:56 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!spool.mu.edu!howland.reston.ans.net!lamarck.sura.net!fconvx.ncifcrf.gov!mack
From: [e-mail] (Joe Mack)
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Message-ID: <[e-mail]>
Organization: Frederick Cancer Research and Development Center
References: <4d7dvb$[e-mail]> <[e-mail]>
Date: Mon, 22 Jan 1996 14:58:51 GMT
Lines: 37

In article <[e-mail]> [e-mail] (Wes Stewart) w
rites:
>In article <4d7dvb$[e-mail]> [e-mail] (Robert
 Thomas Jackson) writes:
>>From: [e-mail] (Robert Thomas Jackson)
>>Subject: tuning in CW/SSB stations w/ AM only radio?
>>Date: 13 Jan 1996 04:55:07 GMT
>
>
>>I seem to remeber a few posts a while back about being able to
>>tune in SSB stations with an AM radio (SW) by just running a
>>477 khz oscillator near it.... Is this true?  Do crystals run
>>down that low?  If so I could just build a VXO in that area and
>>be able to adjust it... Has anyone made this work?
>
>The usual i-f is 455 KHz. Yes crystals can be had for this frequency. A vcxo
>would probably have very limited tuning range, however. This scheme will work

>after a fashion. The AM detector is used to mix the externally supplied
>carrier (BFO) with the SSB signal. The problems include; getting the BFO to
>i-f amplitude ratio correct, AGC system overload from the BFO, poor i-f
>selectivity, etc.
>
>Good luck.
>
>Wes -- N7WS

I did this when I was a kid, tuning in hams on a SW receiver
before I got my ham license. You don't need a crystal oscillator,
any oscillator will do and I just draped a wire from the oscillator
into the back of the box of the radio - no solid connection.

        Joe NA3T
        [e-mail]








From [e-mail] Mon Jan 22 19:57:57 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!eng.ufl.edu!usenet.eel.ufl.edu!news-feed-1.peachnet.edu!pirates!cssun.mathcs.emory.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: tunning in CW/SSB W/ AM SW radio.
Date: 22 Jan 96 02:01:11 GMT
Organization: ucsd usenet gateway
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I have invented a kit that allow you to tune in CW/SSB with two SW  AM radios.
 I
have enjoyed SSB since a year ago. I have to return my Radio Shack DX-390 to t
he
store because of its poor quality compare to my receiver. I have bought many A
M
SW radio from thrift store since than and all of them work great, in fact, I
should say excellent.
        I am willing to share my invention with everyone that does not afford to
buy those expensive receiver and have no time to build complicated things. My
kit just take you 2 minutes to hook up these two radios and ready to enjoy yea
rs
of fun in CW/SSB. No modification and no screw driver or soldering required. A
ll
you need is $5.00 to cover the cost of shipping and cost of the parts for the
simple kits and instruction. email me at [e-mail] for more info.
        I have 6 CW/SSB receivers now at my station. fun! and cheap but
effective.
73
Richard.([e-mail])


From [e-mail] Mon Jan 22 19:57:59 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!sunrise.gv.ssi1.com!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: Thu, 18 Jan 1996 06:01:48 GMT
Organization: RST Engineering
Lines: 27
Message-ID: <4dkno3$[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

>>insert an emitter follower into the
>>power line.  The base of the emitter follower is biased from a
>>resistive voltage divider attached to the collector (which forms
>>the "input"), and a fairly large filter capacitor in parallel with
>>a smaller one is attached from the base to ground.
[snips in consideration of bandwidth]

And if the collector has the slightest bit of inductance to an AC
short to ground (i.e. like a few inches of wire or board trace) you
are gonna have the goldurndest grounded base oscillator you ever HAVE
seen.

Old trick is to put just a few ohms (like 20-50) of real resistor
between the capacitors and the base.  Cuts down the chance of
oscillation to that of winning an argument with the spouse -- slim and
none.

Jim



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



From [e-mail] Mon Jan 22 19:58:00 1996
Path: news.epix.net!uunet!in2.uu.net!news.sprintlink.net!news.azstarnet.com!usr10ip38.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: Sun, 21 Jan 1996 12:02:23 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 38
Message-ID: <[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: usr10ip38.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4dsb1s$[e-mail]> [e-mail] writes:
>From: [e-mail]
>Subject: Re: VCO power supply noise reduction
>Date: 21 Jan 1996 03:14:04 GMT

[snip]

>So I'd disagree that using commercial parts necessarily means 2nd best.  On
>the contrary, a designer should be able to optimize a design with a highly
>repeatable product.

>73,
>Mark

My fears involve long term effects such as problems with moisture and plastic
packaged ICs. This isn't exactly my area of expertise, however, in my
department, we have materials people, chemists, and other components engineers

that share my concern. I realize that some environments, particularly
automotive, have conditions that may be worse than mil spec requirements.
However, if you store your car for ten years in a bunker then ship it to Saudi

Arabia and store it for a while at 140 degrees F and then ship it to Alaska
and store it there for a while then take it out and try to start it with
the first turn of the key, what happens? You probably will have six sigma
(latest buzz word) repeatability; it fails 999,997 times out of 1,000,000.

On a not too related subject, but one brought on by a not to well thought out
edict:

We have also been forced to eliminate the use of oxygen-depleting-chemicals
(ODCs), such as the defluxing agents used to remove rosin flux. So, we use
acid fluxes and water-based solvents. Of course, we are using surface mount
components too. What are the long tern effects of less than perfect removal of

the flux trapped under the components in moist environments. Your guess is as
good as mine. But this is progress :-)

>Airbag.  n.  1) An automotive accessory designed to explode on impact.

ALL of our products are designed to explode on impact.


From [e-mail] Mon Jan 22 19:58:03 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!gatech!newsfeed.internetmci.com!info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: Want simple 0.5-1W amp design for 6m
Date: 17 Jan 96 15:40:00 GMT
Organization: ucsd usenet gateway
Lines: 27
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


hello,

regarding to the message below:

why don't you use the suiting mitsubishi module M57735, it is 0.2W in and
22W out. And you never saw a simpler design like this. The only thing you
have to add is a TX/RX switch...

If you really need a transistor design i can supply you one on request.

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


| Date: Tue, 16 Jan 1996 10:58:48 +0000 (GMT)
| From: [e-mail] (L. DE BRUIJN)
| Subject: Want simple 0.5-1W amp design for 6m
|
| Hello, I would like a simple RF amp schmatics 0.5-1W for the 6m band. Any
| designs?
|
|
|                 Laurens
|
| P.S. I'm a beginner


From [e-mail] Mon Jan 22 19:58:04 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!Austria.EU.net!siemens.at!rdserv.sie.siemens.co.at!news
From: [e-mail] (Josef Gergetz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: UHF-cavity TH327/TH347
Date: Wed, 17 Jan 1996 13:14:23 GMT
Organization: Siemens AG Austria
Lines: 14
Message-ID: <4disgr$[e-mail]>
NNTP-Posting-Host: pc6797.pseg.siemens.co.at
X-Newsreader: Forte Free Agent 1.0.82

Hi there,

for our moonbounce-work at OE6XHF we are looking for a UHF-cavity
for the Thomson TH327 / TH347 power tubes.

If you have any information please write to

[e-mail]
oe6jgd @ oe6xhg.aut.eu

Many thanks
Josef, OE6JGD - op at OE6XHF




From [e-mail] Mon Jan 22 19:58:04 1996
Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!news.ia.net!zeus.ia.net!kovar
From: [e-mail] (Jack Kovar  KE0AX)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB:Brown Bros Paddles for parts.
Date: 18 Jan 1996 16:09:44 GMT
Organization: InterAccess Networking
Lines: 17
Message-ID: <4dlrc8$[e-mail]>
NNTP-Posting-Host: zeus.ia.net
X-Newsreader: TIN [version 1.2 PL2]

        Hi there!

        My BROWN BRO BTL-A paddle got dropped and broke some parts

        on it. Need one paddle adjustment screw, 2 red paddles and red

        plastic paddle pivot block in rear.

        Please help me if you have parts so I can get DITTY BOPPING AGAIN!

                                                Jack Kovar
                                                Ke0AX
                                                319-378-9852
                                                Toddville,Ia





From [e-mail] Mon Jan 22 19:58:06 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!crl.dec.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: X-tal 1.36MHz - looking for
Date: Wed, 17 Jan 96 09:25:41 GMT
Organization: Home
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: lfheller.demon.co.uk

In article <[e-mail]>
           [e-mail] "Frank Bures" writes:

> Desperately looking for 1.36MHz Crystal I need to repair a
> mass spectrometer. If someone has one at home, please help.
> Will pay. Close enough frequency acceptable.
> I could also do with a 21.76MHz one.

Getting crystals made isn't at all expensive. I can get custom crystals
in about a week here in the UK for less than #10.

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


From [e-mail] Mon Jan 22 19:58:07 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!hookup!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!sgiblab!news.spies.com!genmagic!bug.rahul.net!a2i!rahul.net!a2i!news.clark.net!starport!brian.carling
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <4dbk6s$[e-mail]>
Date: Wed, 17 Jan 1996 07:00:00 -0500
Organization: =ACE= ONLINE [phone]
Subject: XLR balanced to non ckt.
Message-ID: <[e-mail]>
Lines: 19

Newsgroups: rec.radio.amateur.homebrew
From: [e-mail]
"mail sometimes bounces here, please resend if needed!"

Dave you really probably need the adapter that has a transformer built
in to it...

DA>Need to convert XLR (cannon)  balanced inputs to standard line input.   Do
I
DA>just put
DA>one end to ground and use the other?   XLR is a balanced audio input (for
DA>lower noise)
DA>Not sure of  Z in ckt.

DA>Thanks

DA>Dave
---
 ■ SLMR 2.1a ■



From [e-mail] Mon Jan 22 19:58:08 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.dorsai.org!news.ilx.com!psinntp!psinntp!psinntp!howland.reston.ans.net!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: Re: XLR balanced to non ckt. is it easy ??
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4dbk6s$[e-mail]>
Date: Sun, 14 Jan 1996 23:04:48 GMT
Lines: 26
Sender: [e-mail]

[e-mail] (Dave Austin) writes:

>Need to convert XLR (cannon) balanced inputs to standard line input.  Do
>I just put one end to ground and use the other?  XLR is a balanced audio
>input (for lower noise) Not sure of Z in ckt.

With any transformer-input circuit (many pro balanced ins still use
transformers), you should indeed ground one side of the balanced line, and
feed your unbalanced hot side to the other balanced pin.  Usually for
microphones, the phasing standard is "pin 2 high, pin 3 low".

Surprisingly, you may not actually have a balanced input even with XLR
connectors -- I have a Yamaha board at work like this where the balanced
transformers are an *option*, and not installed.

If it's NOT a transformer input, you should do what gives you best
results:  just feed from ground to one of the balanced legs.  In this
case, there's an active differential input, and grounding one side will
do you no good in some cases.


: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html <



From [e-mail] Mon Jan 22 19:58:09 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have?
Date: 16 Jan 1996 17:26:07 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 22
Sender: [e-mail]
Message-ID: <4dh8lv$[e-mail]>
References: <4demi7$[e-mail]>
Reply-To: [e-mail] (PFZouave)
NNTP-Posting-Host: newsbf02.mail.aol.com

I was the original poster who created this "Xpert Needed: Zener Diodes"
thread. I figured I'd take a moment to thank the dozens of individuals who
took the trouble to respond.

The composite answer appears to be this: Yes, the forward biased diodes
can be used as a reverse biased zener might, and several individuals have
done so in their designs, though there can be troubles related to
temperature effects, and the fact that the forward "breakdown" does not
exhibit the sharp "knee" that the zener would.

For my particular application (as outlined in the original message), it
seems the best route may be to forgo the zener/transistor discrete circuit
in lieu of one of the many available 3-terminal supervisor IC's by maxim,
panasonic, dallas, and even sony.

Again, thanks to all for their help!!
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Mon Jan 22 19:58:10 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.netnet.net!news.inc.net!news.sol.net!uniserve!van-bc!news.mindlink.net!agate!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4d4ik0$[e-mail]>
Date: Mon, 15 Jan 1996 04:03:46 GMT
Lines: 13
Sender: [e-mail]

in <4d4ik0$[e-mail]>, PFZouave wrote:
: My problem is this: The processor is spec'd to work down to 2.5 volts. If
: I add a safety margin and say the minimum before reset should be 3.o
: volts, 3 - 0.7 leaves me with a required zener voltage of 2.3 volts. I
: have several catalogs laying around here, and can't find any zeners less
: than 3 volts.

The TL431 shunt regulator IC (also called a programmable zener) is
good down to 2.5 volts.  It doesn't like much parallel capacitance,
but otherwise looks like a zener.

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



From [e-mail] Mon Jan 22 19:58:11 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!chi-news.cic.net!mr.net!news.mr.net!msc.edu!apctrc!paperboy.amoco.com!cronkite!usenet
From: Chester Mccarter <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Yaesu FIF-232c information and/or help
Date: Mon, 22 Jan 1996 02:54:34 -0800
Organization: Amoco Corp
Lines: 9
Message-ID: <[e-mail]>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6a (Win16; I)
Xref: news.epix.net rec.radio.amateur.misc:97089 rec.radio.amateur.homebrew:12824 rec.radio.amateur.equipment:23916

I have a Yeasu FT747GX and am trying to find a diagram of the FIF-232c
CAT cable. I'm sure that there is someone out there that has built a
similiar type cable. Please reply via e-mail also.


--
Chester Mccarter, CNE
[Team OS/2]
[e-mail]


From [e-mail] Mon Jan 22 19:58:12 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!purdue!yuma!holly.ACNS.ColoState.EDU!drranu
From: [e-mail] (Emarit Ranu)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Re: Yaesu FIF-232c information and/or help
Followup-To: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Date: 22 Jan 1996 18:00:48 GMT
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 20
Message-ID: <4e0jcg$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: holly.acns.colostate.edu
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.misc:97094 rec.radio.amateur.homebrew:12826 rec.radio.amateur.equipment:23919

Chester Mccarter ([e-mail]) wrote:
: I have a Yeasu FT747GX and am trying to find a diagram of the FIF-232c
: CAT cable. I'm sure that there is someone out there that has built a
: similiar type cable. Please reply via e-mail also.


        Try February QST, 1993 page 37.  Less than $10 to make and works
        damn well.

: --
: Chester Mccarter, CNE
: [Team OS/2]
: [e-mail]

--
        -Emarit  73's          [e-mail]
        Electrical Engineering, Colorado State Univeristy
        KG0CQ                 _._  __.  _____  _._.  __._
        Packet:                KG0CQ@KF0UW.#NECO.USA.NOAM
        All generalizations are bad.  Censorship:  ######


From [e-mail] Fri Jan 26 13:47:56 1996
Path: news.epix.net!uunet!in1.uu.net!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.homebrew
Subject: @test Gateway 4l900 - 14:34Z
Date: 24 Jan 96 13:37:00 GMT
Organization: ucsd usenet gateway
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


test 01/24/96 14:34Z


From [e-mail] Fri Jan 26 13:47:57 1996
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.fibr.net!news1.crl.com!nntp.crl.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom2!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: Adding lighting to Red Lion Controls counter modules
In-Reply-To: [e-mail]'s message of Tue, 23 Jan 1996 06:40:39 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]>
Date: Wed, 24 Jan 1996 22:49:17 GMT
Lines: 14
Xref: news.epix.net sci.electronics.components:1514 rec.radio.amateur.homebrew:12906

No response so far, but an alternative question.
Does anyone have an address or other contact information for Red Lion
Controls?
73, doug

   Newsgroups: sci.electronics.components
   From: [e-mail] (Doug Faunt N6TQS [phone])
   Date: Tue, 23 Jan 1996 06:40:39 GMT

   Has anyone added lighting to Red Lion Controls counter modules, as
   sold by DigiKey?  I want to use one in the car, but I want to be able
   to see it, night and day, easily.  Are any of them easier to
   illuminate than others?
   73, doug


From [e-mail] Fri Jan 26 13:47:58 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.kei.com!ub!csn!mesa5.mesa.colorado.edu!mesa5.mesa.colorado.edu!not-for-mail
From: [e-mail] (James P. Rybak)
Newsgroups: rec.radio.amateur.homebrew
Subject: Alpha-Delta Antennas
Date: 21 Jan 1996 17:24:04 -0700
Organization: Mesa State College
Lines: 5
Message-ID: <4dulf4$[e-mail]>
NNTP-Posting-Host: 198.233.35.99
X-Newsreader: TIN [version 1.2 PL2]

Has anyone had any experiences (good or bad) with Alpha-Delta antennas?



Jim Rybak  W0KSD


From [e-mail] Fri Jan 26 13:47:59 1996
Path: news.epix.net!news.sprintlink.net!cc.iu.net!bb.iu.net!blombard
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Announcing FilDes 2.0
Date: 25 Jan 1996 13:03:10 GMT
Organization: InternetU, Inc., Palm Bay, FL
Lines: 26
Message-ID: <4e7v2e$[e-mail]>
References: <4e6pmh$[e-mail]>
NNTP-Posting-Host: bb.iu.net
X-Newsreader: TIN [version 1.2 PL2]

Bob Lombardi ([e-mail]) wrote:

deleting much of my post.

: The program comes with a companion utility called Airwndl (Air Wound L)
: which calculates the number of turns for an air-wound single-layer
: solenoid coil.  A complete description of Fildes2 is included in the
: file FilDes2.doc, and also as a Windows 3.1 Write (r) file, FilDes2.wri.
: Everything is in a zipped archive called FDS200.ZIP.  It is available
                             note this:   ^^^^^^^^^^^
: at ftp.lehigh.edu where it is currently found in /pub/listserv/qrp-l/tools.
: I have also uploaded it to ftp.ee.ualberta.ca in the directory
: /pub/cookbook/softw/ibm.  It should be available there shortly.


I goofed.  The name of the archive is fds200a.zip.  You wouldn't find
the other one anyway, but just in case you're using some sort of program
to get it for you, you should have the exact name.


 --
 Bob Lombardi            WB4EHS in Melbourne, FL          o        \---\---\
 [e-mail]    or   [e-mail]        /\            |
 Telescope making, optics, astronomy, piano, bicycling  -\ 7   & radio |
 I've run out of things I can say in 4 lines.         (*)/(*)          |



From [e-mail] Fri Jan 26 13:48:00 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!cs.umd.edu!coopnews.coop.net!news.den.mmc.com!news.vf.mmc.com!ew0203!hbrown
From: [e-mail] (Harry H. Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ANY INFO ON  AM912A/TRC?
Date: 23 Jan 1996 16:26:48 GMT
Organization: Sun Microsystems
Lines: 11
Distribution: world
Message-ID: <4e3288$[e-mail]>
References: <4dplgm$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ew0203.resd.vf.ge.com

Gary,

I would guess that the efficiency will be as good or better than a strip line
or tuned line design. With the silver plating it will be a little better but n
ot a whole lot. I would suggest using the 250. Use one of the 250 amp designs
from an older ARRL handbook to determine the bias voltages required and how to
 key it on during transmit.

I would expect somewhere around 55 to 60 % effeciency. I have an AM-6154 amp t
hat uses an 8930 which is essentially a 250 but with a larger plate diameter a
nd around 350 watts dissapation. It works very well and I have gotten 350 or s
o watts out. I never bothered to calculate the efficiency. There is no reason
why you shouldn't get 250 or so watts out.

73, Harry, W3IIT






From [e-mail] Fri Jan 26 13:48:01 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!agate!holonet!colossus.holonet.net!woodybbs!1-275-17-0!bill.ward
From: [e-mail] (Bill Ward)
Date: 23 Jan 96 09:18:38
Newsgroups: rec.radio.amateur.homebrew
Subject: ANY INFO ON  AM912A/TRC?
Message-ID: <[e-mail]>
X-FTN-To: Gary Davidson
Organization: WoodyWare Software, Inc.
Lines: 18

The device that you're describing is presently being sold by a mil.
surplus co. named Fair Radio, which is located in Lima Ohio. They may be
able to supply you with some if not all of the schmatics of that unit.
You can probably use a 4cx250 in it with no problems. One thing that you
will to do is build a power supply for it,but if you look in any
A.A.R.L. manuals, you be able to find a supply for vhf use using that
tube. How you plan to use the amp also should be considered. Different
modes require different voltages especially for ssb and fm. I hope this
helps.

--- WILDMAIL!/WC v4.10
 # Origin: AR-NET: Excalibur BBS, 404-608-1907, (73:1501/2)  (73:1501/2.0)
--
|Fidonet:  Bill Ward 1:275/17
|Internet: [e-mail]
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Fri Jan 26 13:48:02 1996
Path: news.epix.net!news.sprintlink.net!maggie.ionsys.com!news.corpcomm.net!news.gate.net!news-adm
From: [e-mail] (Larry Lewis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Balum Loss Question
Date: Fri, 26 Jan 1996 00:53:22 GMT
Organization: CyberGate, Inc.
Lines: 15
Message-ID: <4e98au$[e-mail]>
NNTP-Posting-Host: ftmfl2-13.gate.net
X-Newsreader: Forte Free Agent 1.0.82

What is the loss (in db) of a 4:1 coax (assume 9913) balum at 144 mhz?
or
Where can I find the data (didn't see it in 1993 ARRL Handbook nor the
RSGB VHF/UHF handbook)?
or
How to calculate the loss.
or
What is your guess?  My guess  is 0.2db???

Any guidance would be appreciated, your educated guess will also be
appreciated.

Thanks - Larry KN6WC      Please reply via e-mail




From [e-mail] Fri Jan 26 13:48:03 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!agate!holonet!colossus.holonet.net!woodybbs!1-275-17-0!bill.ward
From: [e-mail] (Bill Ward)
Date: 23 Jan 96 09:07:49
Newsgroups: rec.radio.amateur.homebrew
Subject: Balun Help
Message-ID: <[e-mail]>
X-FTN-To: Lawrence Stoskopf
Organization: WoodyWare Software, Inc.
Lines: 13

I think what you're looking for can be found under the company named
the"Wireman". He sella a unum 50 to 50 ohmns that is based on teflon
coax with ferrite beads. His adress can be found in most ham radio mag.
under that name. Gud luck. N4BLR

--- WILDMAIL!/WC v4.10
 # Origin: AR-NET: Excalibur BBS, 404-608-1907, (73:1501/2)  (73:1501/2.0)
--
|Fidonet:  Bill Ward 1:275/17
|Internet: [e-mail]
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Fri Jan 26 13:48:06 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.sprintlink.net!eskimo!bgudgel
From: [e-mail] (Bob Gudgel)
Subject: Re: Circut req'd - telephone line in use indicator.
X-Nntp-Posting-Host: eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: Eskimo North (206) For-Ever
X-Newsreader: TIN [version 1.2 PL2]
References: <[e-mail]> <[e-mail]>
Date: Sun, 21 Jan 1996 18:54:18 GMT
Lines: 15

I understand that there is a device that can be connected in series with
your modem or phone that inhibits off hook when another extension is in use.

Here in Seattle it is supposedly available at Home Depot (a home hardware
store).  I think it is a thyristor type device that turns on when the
voltage across it is larger than some preset value (20 volts maybe).  Of
course, if the voltage is somewhat low, then the line is already in use
and it won't trigger.  This is only a guess as to how it works, but
hearing that it was a two terminal "diode looking" device, that's
probably correct.  Also, supposedly one of these things had an LED in
series also.  I would think though that you'd want to put a capacitor in
parallel with that for less attenuated audio.

Bob   KI7IQ     http://www.eskimo.com/~bgudgel



From [e-mail] Fri Jan 26 13:48:07 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet
From: [e-mail] (Richard Christensen)
Newsgroups: rec.radio.amateur.homebrew
Subject: coax and connectors
Date: 23 Jan 1996 10:49:02 -0600
Organization: AutoSoft Corp., Bountiful, UT
Lines: 15
Sender: [e-mail]
Message-ID: <4e33hv$[e-mail]>
NNTP-Posting-Host: andes.sps.mot.com


Where is a good place to get coax and connectors?  I don't want to be
more specific than this since I am interested in projects from HF to
microwave.
--
         /\                  /\       .       /\____
 _-_    /  \       _/\      /  \     /\      /      \        /\
/   \  /    \     /   \  /\/    \   /  \_/\_/   Y    \  /\/\/  \
  u  \/      \___/     \/        \ /                  \/        \
----------------------------------v--------------------------------
Richard Christensen                                          KC7JPQ
[e-mail]                 Go Cougars!! Beat Utah!!!
[e-mail]
Wk Ph. # [phone]



From [e-mail] Fri Jan 26 13:48:08 1996
Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.pitt.edu!news
From: Sandy Knepper <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Collins KWM-380
Date: 23 Jan 1996 22:55:29 GMT
Organization: University of Pittsburgh
Lines: 10
Message-ID: <4e3p11$[e-mail]>
NNTP-Posting-Host: jbddup-a-12.rmt.net.pitt.edu

Does anyone know of someone who would repair my KWM-380.  I have
two circuit boards (control and synthesizer) that must have a
bad chip.  Are there any boards available or nonworking KWM-380s.

Thanks,

Dave, W3BJZ
Publisher of the monthly Collins Journal

[phone] (eve.)


From [e-mail] Fri Jan 26 13:48:09 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Collins KWM-380
Date: 24 Jan 1996 01:40:50 GMT
Organization: Los Alamos National Laboratory
Lines: 16
Message-ID: <4e42n2$[e-mail]>
References: <4e3p11$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]

(This is a second try since your listed email address refused
to respond)

I maintain several KWM-380's and HF-380's and have a priceless
service manual for them.  I even have a junker or 2 but they
are not for sale.  How about some symptoms?  Maybe we could
narrow down which board it may likely be...
and go from there.
--
|-------------------------------------------------------|
|Jim Devenport                                          |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|-------------------------------------------------------|




From [e-mail] Fri Jan 26 13:48:10 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.supernet.net!nntp.cntfl.com!news.fsu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!news.dfn.de!news.kfa-juelich.de!djukfa11!iff161
Organization: Forschungszentrum Juelich
Date: Tue, 23 Jan 1996 21:11:55 +01
From: Bob Mueller <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Custom meter scales!
Lines: 21

Just a word of warning!  You can just divide up an arc into equal segments and
get a nice looking scale but it is likely to be inaccurate.  To do a good job
you should measure a bunch of angles versus current and construct a smooth
scale by interpolation on the measured points (or measure ALL the places where
there are to be scale divisions!).  I would suggest 10 or so measured points.
    The problem is that the magnetic fild is not strictly uniform over the
region used by the meter coil.  There are various reasons  for the nonuniform
field but the end effect is a nonlinear scale which is dealt with in different
ways by different commercial makers.  One technique is to have several scales
with different sorts of common nonlinearities built in.  Then pick the one
most nearly matching the movement.  Hewlett Packard had a machine which could
follow the needle as different currents were applied to the movement and
construct a very nice scale from the measurements.  (I suspect writing the
scale onto a film.) This scale then belonged only to the tested meter.
   For one time only users, doing it by hand is not a bad job.  I recently
made a scale and the result was good (without any computer but working on an
enlarged master followed by photcopy size reduction.)

                                             Bob<iff161@djukfa11>




From [e-mail] Fri Jan 26 13:48:11 1996
Path: news.epix.net!uunet!in1.uu.net!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Custom meter scales!
Date: 24 Jan 1996 08:38:41 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 36
Sender: [e-mail]
Message-ID: <4e5cp1$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, Bob Mueller
<[e-mail]> writes:

>
>Just a word of warning!  You can just divide up an arc into equal
segments
>and
>get a nice looking scale but it is likely to be inaccurate.  To do a good
job
>you should measure a bunch of angles versus current and construct a
smooth
>scale by interpolation on the measured points (or measure ALL the places
>where
>there are to be scale divisions!).  I would suggest 10 or so measured
points.

I used to manage the D'Arsonval meter area of Prime Instruments. Our low
quality "wigglers" had gross non-linearity over their measurement ranges,
but the 90 degree deflection high quality movements were *very* linear.

As an interesting note, some customers specified their meters caliberated
up to 100% high, but 0% low. That way the charging equipment they sold
never "looked bad".  That tolerance was necessary on 39 cent wholesale
price meters!

Gross non-linearity was usually caused by non-linear spring pressure (the
cheap meters either used magnetic zero return or a simple single turn
spring), and the pole pieces being poorly constructed. The permanent
magnet's poles did not surround the movable coil with a uniform air gap in
the cheap meters, so flux density changed as the coil moved through it's
arc.

Check the scale linearity when working with unknown meters, especially if
the movements are cheaply made!

73 Tom


From [e-mail] Fri Jan 26 13:48:12 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!kerry.w..miller
From: Kerry.W..Miller%1:2619/211.9 (Kerry W. Miller%1:2619/211.9)
Date: 21 Jan 96 10:11:50
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Does anyone have a design for a simple-ish radio transmitter/tra
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 39

To: Kerry W. Miller%1:2619/211.9%12:320/100.666
From: [e-mail] (Kerry W. Miller)
Subject: Re: Does anyone have a design for a simple-ish radio
transmitter/transciever
Organization: customer of Internet America

[e-mail] (Cian Murphy) wrote:

>I have been surfing around for a while on the Net looking for a design
>for a radio transmitter Range Does Not Matter. I'm just looking for a
>starting point to radio - cheaply. I would be very grateful to anyone
>who could mail one in ascii/ attached bitmap or otherwise directly to
>the above address, using my name Cian Murphy, as the Subject.

>                                               Thanks

Cian,
        As soon as I can get together with a friend who has a scanner, I'll
scan in a few schematics and post them or e-mail them.  We've been
having problems getting our free times at the same times!  I have a
couple of qrp transmitters, a rx or two, and I think even a simple
transceiver.  I'll post something here when I get the scans done.
There were several others who asked about them, so I'll drop a note
here when I get them scanned.
73,
Kerry
[e-mail]



 # Origin: Usenet:customer of Internet America (1:2619/211.9)

 # Origin: Gateway ARNet <-> HamNet by HB9EBW (12:320/100.666)
--
|Fidonet:  Kerry W. Miller%1:2619/211.9 2:301/249.666
|Internet: Kerry.W..Miller%1:2619/211.9
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Fri Jan 26 13:48:13 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!sparky.wrlc.org!netnews.com!uhog.mit.edu!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Dry Cell sizes
Date: 23 Jan 96 22:32:31 GMT
Organization: ucsd usenet gateway
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

There has been a thread on Ham-Homebrew about how to put a "blank" AA
dry cell in a pack when going from Nicad to Alkaline.  This reminded
me of something I saw when putting the kids' toys together at
Christmas.  Many of the toys use a reducer and a AA cell where there
is intended to be  a C cell during normal use!  These are found
primarily on the toys that scream "TRY ME" to the kids.  (I'm a big
kid at heart and it drives my wife nuts.  "How can I teach the kids
not to touch when you do?").

So the moral is: if you have something that uses C cells and you need
an emergency supply, you can wrap something around a AA and get a C
cell.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Fri Jan 26 13:48:14 1996
Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!dns.crocker.com!calweb!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: dummy load?
Date: 25 Jan 1996 16:09:52 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 5
Message-ID: <4e8a0g$[e-mail]>
References: <4dja6q$[e-mail]> <[e-mail]>
NNTP-Posting-Host: sac1-2.calweb.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)

If ypu need to go to higher frequencies than 50 MHz then get as much
RG58 as you can (50 to 100 feet) and use it as an attenuator with
the dummy load as described by Jim W9GXC.
Bill K7NOM



From [e-mail] Fri Jan 26 13:48:15 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.ntnet.nt.ca!gov.nt.ca!ve8ev
From: [e-mail] (John Boudreau)
Subject: Duplexer to Bandpass Filter
Message-ID: <[e-mail]>
Organization: Government of the NWT, Canada
Date: Wed, 24 Jan 1996 23:50:15 GMT
Lines: 14


I have a 3 cavity mobile VHF duplexer that I would like to re-configure
as a 2m bandpass filter.  Is this possible?  How would I go about it?

Thanks for any info, please reply direct...
73
John  VE8EV

================================================================
John Boudreau - VE8EV       E-mail: [e-mail]
Inuvik, NWT                 Packet: VE8EV@VE8EV.#INU.NT.CAN.NOAM
CANADA                              VE8EV@KO-23/KO-25
================================================================



From [e-mail] Fri Jan 26 13:48:15 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!news.uni-mainz.de!news.th-darmstadt.de!uni-erlangen.de!rznews.rrze.uni-erlangen.de!news
From: Richard Hieber <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: European archive site?
Date: 25 Jan 1996 16:00:42 GMT
Organization: RRZE
Lines: 21
Message-ID: <4e89fa$[e-mail]>
NNTP-Posting-Host: miraculix.rrze.uni-erlangen.de
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.antenna:18654 rec.radio.amateur.homebrew:12921

Hi all,

as I tend to use my Usenet browser quite unregulary, I'd prefer
to retrieve the traffic of the last few months or so at an
archive site. I know the official archive site of r.r.a.antenna
and of r.r.a.homebrew somewhere at a stateside location, but the
slowness of my access takes the fun out of it.

I'd like to know an archive site for the rec.radio.amateur.*
newsgroups somewhere in Europe. I don't need an FTP site for
programms or stuff, just archived Usenet traffic. Do you know
any, over here in the Old World?

Vy 73,
Richard

--
Richard Hieber, DL8MFQ/AA8CP
EMAIL: [e-mail]




From [e-mail] Fri Jan 26 13:48:17 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!ablecom!ns2.mainstreet.net!sloth.swcp.com!news.dgsys.com!usenet
From: [e-mail] (Bruce & Debora Gordon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Follow up vehicle battery question...
Date: 22 Jan 1996 00:38:07 GMT
Organization: [e-mail]
Lines: 15
Message-ID: <4dum9f$[e-mail]>
NNTP-Posting-Host: juneau_15.dialups.ptialaska.net
X-Posted-From: InterNews 1.0.6@juneau_15.dialups.ptialaska.net
X-Authenticated: wcovexip on POP host moose.ptialaska.net

Get ride of the gell cells if you leave your car out in freezing
weather.  They are very seceptable to freezing and will be distroyed if
they do.  Deep cycle marine batteries are a much better solution.  I
had real problems with gell cells in cold weather here, so I speak with
realtime experience.

  Bruce Gordon * Debora Gordon R.N.         Bruce's Trading Post
        P.O. Box EXI                        Excursion Inlet South
     Juneau, Alaska 99850               Excursion Inlet, Alaska 99850

    University of Alaska            Remote Weather Data Collection Site
   [e-mail]               AL7AQ@KL7HFI * KL7WJ@KL7HFI
    [e-mail]                  Wards Cove Packing Co.

       ****  Have bandwidth and connection   Will communicate  ****


From [e-mail] Fri Jan 26 13:48:17 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!usc!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (WA8ULX)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS 486 & 386 Processor
Date: 23 Jan 1996 11:12:41 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 2
Sender: [e-mail]
Message-ID: <4e31dp$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com

I have an Intel 486DX-25 processor and 386DX-25 processor for sale if
interested I can be reached at [e-mail] 73 bRUCE


From [e-mail] Fri Jan 26 13:48:18 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!plug.news.pipex.net!pipex!weld.news.pipex.net!pipex!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!news.sesqui.net!compassnet.com!usenet
From: Spencer Petri <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: HV supply diodes!
Date: 25 Jan 1996 01:56:00 GMT
Organization: Compass Net, Inc.
Lines: 6
Message-ID: <4e6nvg$[e-mail]>
NNTP-Posting-Host: dial49.e-tex.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Great diodes for your big amp supply. These are 20,000 V and I
ran a check at 1.2A for 6 hours, these babies can take it.  $10
each or build a bridge at 4 for $35. $3 for priority mail.

73 de Pete WA5JCI EM-21



From [e-mail] Fri Jan 26 13:48:19 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!uwm.edu!cs.utexas.edu!howland.reston.ans.net!usc!news.cerf.net!newsserver.sdsc.edu!acsc.com!news.trw.com!batman!out
Newsgroups: rec.radio.amateur.homebrew
Subject: FS:WCC100 Soldering Iron tips
Message-ID: <1996Jan24.130405.1455@batman>
From: [e-mail] (Byron)
Date: Wed, 24 Jan 1996 20:01:17 GMT
Reply-To: [e-mail] (Byron)
Nntp-Posting-Host: 129.193.101.235
Lines: 6

For Sale 25 ETO long conical soldering tips.
New and unused. For the Weller WCC100 temp controlled Iron.
Sell all 25 for $25 Retail about $5 each.
e-mail [e-mail]




From [e-mail] Fri Jan 26 13:48:20 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!newsjunkie.ans.net!Rezonet.net!mixnews2!qbc-clic!com18!daniel.lacasse
Newsgroups: rec.radio.amateur.homebrew
In-Reply-To: [e-mail]
Subject: Games or features on TM-742A?
From: [e-mail]
Message-ID: <[e-mail]>
Date: Mon, 22 Jan 96 11:53:00 EST
Organization: Babillard COM18 BBS
Lines: 11

Hi all,

PLEASE, if you know any hidden features or have heard about it, please
let me know!

TM-741A has 3, does the TM-742A has at least one???


73's de  |    Fido: 1:240/118    |  Internet: [e-mail]
I)aniel  |  Franco: 101:155/118  |    Packet: VE2DLX@VE2SJC.#QBC.PQ.CAN.NA



From [e-mail] Fri Jan 26 13:48:21 1996
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From: [e-mail] (Clinton Peebles)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Grapefruit powered XMTR?
Date: Sun, 21 Jan 1996 14:06:00 GMT
Message-ID: <[e-mail]>
Organization: Salmon Siding Saloon BBS 604-357-9942
Distribution: world
References: <bayomi.822065511@access> <[e-mail]> <4di8v6$
Lines: 7


B>re: grapefruit powered Transmitter,   Did Gilligans Island know about it?

Didn't the professor make a battery charger out of coconuts on one
episode? They had to stir their coconuts.
---
 ■ QMPro 1.53 ■ Salmon Siding Saloon - Salmo B.C. [phone]


From [e-mail] Fri Jan 26 13:48:21 1996
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From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Grapefruit powered XMTR?
Date: 22 Jan 1996 13:02:38 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
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The discussion of grapefruit powered whatever reminded me of an ad I saw
in a trade rag five, maybe six years ago for a company making single board
microcontrollers. The add was full color, back back spread featuring their
board connected to an exercise wheel with a gerbil running in it. It
looked like the had replaced one of the exercise wheel's bearings will a
little dc motor (generator).
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From [e-mail] Fri Jan 26 13:48:23 1996
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From: [e-mail] (Christopher K Greenhalgh)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Grapefruit powered XMTR?
Date: 19 Jan 1996 19:27:13 GMT
Organization: The Ohio State University
Lines: 29
Message-ID: <4dorah$[e-mail]>
References: <[e-mail]> <4dj0qa$[e-mail]> <[e-mail]> <bayomi.822065511@access>
NNTP-Posting-Host: beauty.magnus.acs.ohio-state.edu

In article <bayomi.822065511@access>, Don Bayomi <[e-mail]> wrote:

>re: grapefruit powered Transmitter,   Did Gilligans Island know about it?
>
>I will have to try that experiment with the grapefruit.

Perhaps I missed the first part of this thread, but when I was in grade
school, one of our science projects was making a battery out of an orange.
We took pennys (copper) and nickles (zinc I think) and pushed them into the
orange 3/4s the way down, alternating between them (penny, nickle, penny,
nickle, penny, ect.), being very carfull not to let them touch...but getting
them as close as you can.

After going half way around (dont go any farther...it will slowly decrease
the voltage), we were able to light a small lamp. I cant remember what voltage
we got...but it did work...a basic 'acid' battery. Remember to end one side
with a penny, and the other with a nickle (polarity).

I also remember seeing a potatoe powered clock somewhere in a catalog...but
cant remember where, but do remember it worked on the same principal.

Take care all, & 73.


--
Christopher K. Greenhalgh, N8WCT
Computer/Electronic Tech. II at The Ohio State University
E-Mail: [e-mail] ([e-mail])
Radio : n8wct@w8cqk.#cmh.oh.usa.noam


From [e-mail] Fri Jan 26 13:48:24 1996
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From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #23
Date: 21 Jan 96 21:30:25 GMT
Organization: ucsd usenet gateway
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

At 08:22 PM 1/20/96 PST, you wrote:
----------------------------------------------------------------------
>
>Date: Fri, 19 Jan 1996 17:39:11 GMT
>From: [e-mail]
>Subject: 814 vacume tube
>
>does anyone know the use and value of these tubes?
>a friend ahs a few that appear unused.
>73
>barry
>wb1edi
>
>------------------------------
  It is about 1/2 the size of an 813.

73
Bill ko4ww

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




From [e-mail] Fri Jan 26 13:48:25 1996
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From: [e-mail] (William Kresl)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help needed repairing eddystone SW rig.
Date: Sat, 20 Jan 1996 23:39:28 GMT
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[e-mail] (Paul Egan) wrote:


>I need some help repairing an Eddystone EC-10 SW rig.
>I have the manual and have tested the transistors using the
>figures in the "Voltage Analysis" section.
>All seemed close to the values quoted except TR4 & TR5 (IF Amp).
>TR4 should be 0.87v (E) 1.15(B) 5.6(C) but is 0.36(E) .64(B) 1.71(C)
>TR5 should be 0.40v (E) 0.70(B) 7.5(C) but is 0.05(E) .28(B) 0.28(C)

>I am not well versed in electronics repair and am hoping that someone can
>put in the right direction. Should these transistors be replaced? If so,
>would they be commonly available here in Canada. (OC171) If not, then
>what would be a suitable substitution? I've noticed that these
>transistors have 4 leads. The fourth is labeled "S" and always goes to
>ground. Is this akin to grounding the case of the transistor?
>Looking forward to hearing from anyone who may be able to help.
>Please email. Thanks in advance.
>Paul.

The 'S" is for SHIELD, normally tied to ground. Based on the voltages
you described between the BASE and EMITTER I would conclude these
are old GERMANIUM type transistors...hard to come by. Also, based on
your measured values, your collector values are quite low from what
they shoould be.. I doubt the transistors are the cause but another
stage (like AF AMPLIFIER transistor) shorting out that bogs everything
else down...or a resistor or RF CHOKE that feeds your IF AMP. Very
rarely do CLASS A amplifier stages operating at low DC levels just
die, I would look at the HI-POWER stages...AF AMP, POWER SUPPLY
and REGULATOR first......

--
Wm Kresl
WB9BBC @KD9JK.WI.USA.NOAM

--
Wm Kresl
GE Medical Systems
Milwaukee, WI



From [e-mail] Fri Jan 26 13:48:26 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Help needed repairing eddystone SW rig.
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Thu, 25 Jan 1996 17:01:51 GMT
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Paul Egan ([e-mail]) wrote:

: I need some help repairing an Eddystone EC-10 SW rig.
: I have the manual and have tested the transistors using the
: figures in the "Voltage Analysis" section.
: All seemed close to the values quoted except TR4 & TR5 (IF Amp).
: TR4 should be 0.87v (E) 1.15(B) 5.6(C) but is 0.36(E) .64(B) 1.71(C)
: TR5 should be 0.40v (E) 0.70(B) 7.5(C) but is 0.05(E) .28(B) 0.28(C)

  Without a manual in front of a reader, this won't help much.

  I've fixed several EC10's  though the last was some years ago. They're
twee enough to want to fix, but not particularly good performers, though.

   What I found were loads of dead transistors. I suspect most of the
OC170 OC171 devices have an age related silent failure mechanism. The
AF115 or was it AF117 was notorious.

  A bit of artful recalculation of bias resistors and fitment of some
fairly docile modern silicon devices ought to be possible.

   Reliability of resistors and larger values of capacitors of that
period was a bit poor, too.  A rebuild may make more sense than a repair.




  Cheers
            David


From [e-mail] Fri Jan 26 13:48:27 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 19 Jan 1996 10:47:56 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 19
Sender: [e-mail]
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In article <[e-mail]>, [e-mail]
(Gary Coffman) writes:

>It doesn't take much of an impedance for that
>pulse to translate to a very high voltage (a megavolt is not uncommon),
>which can then flash across ordinary insulation or air gaps. The purpose
>of transient suppressors is to give the pulse a defined and controlled
>place to discharge rather than depending on chance to allow it to flash
>somewhere unpredicted.

That's a lot of current, it almost sounds like a direct hit on the outlet!

Are you saying the MOV you were describing would protect equipment from
damage with that type of hit? Perhaps they are worthwhile!

Can you run a model of the MOV you described in a typical line input
circuit to see what happens?

73 Tom


From [e-mail] Fri Jan 26 13:48:28 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Help With MOV's
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4dgqha$[e-mail]> <4djhh1$[e-mail]>
Date: Fri, 19 Jan 1996 14:29:56 GMT
Lines: 26

In article <4djhh1$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>In article <[e-mail]>, [e-mail]
>(Gary Coffman) writes:
>
>>It doesn't, nor does it need to, a megavolt transient is quite sufficient
>>in itself.
>
>How does a megavolt ultra short rise time transient make it past the line
>bypass caps, terminal blocks outlet, fuse box and so on?

It often doesn't. The impedances across which it is expressed will determine
whether it will flash over there or not. The transient, for the case of
lightning, is a current pulse of up to 18,000 amperes, but of very short
duration (so energy is low). It doesn't take much of an impedance for that
pulse to translate to a very high voltage (a megavolt is not uncommon),
which can then flash across ordinary insulation or air gaps. The purpose
of transient suppressors is to give the pulse a defined and controlled
place to discharge rather than depending on chance to allow it to flash
somewhere unpredicted.

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


From [e-mail] Fri Jan 26 13:48:29 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!newshub.cts.com!newshub.nosc.mil!news!horowitz
From: [e-mail] (Alan M. Horowitz)
Subject: Re: How to add battery capacity to a vehicle?
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: NCCOSC RDT&E Division, San Diego, CA
References: <[e-mail]> <[e-mail]>
Date: Wed, 17 Jan 1996 20:49:46 GMT
Lines: 4

The camper  modules are a high-current diode, meant to ensure that the car's
oem battery doesn't see the (separately wired)  "camper" load.  The purpose
is to ensure that the battery which motivates the starter, doesn't get
drained too low by camper use.


From [e-mail] Fri Jan 26 13:48:30 1996
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From: [e-mail] (Tomek Burdziak)
Newsgroups: rec.radio.amateur.homebrew
Subject: How to expand the TX range of the Icom IC-T22
Date: 26 Jan 96 13:17:52 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


Hello everybody.

I need my IC-T22 to transmit on 160MHz where paraglider pilots used to chat.
If you know how to make my Icom do it, please, write to me.
Maybe you know somebody who knows? You could make me happy giving me his
address.

Thank you in advance,

Tomek





From [e-mail] Fri Jan 26 13:48:31 1996
Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!picker!central.picker.com!sam
From: [e-mail] (Sam Goldwasser)
Subject: Re: I found some old vacuum tubes ...
In-Reply-To: [e-mail]'s message of 25 Jan 1996 15:09:55 GMT
Message-ID: <[e-mail]>
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In article <4e86g3$[e-mail]> [e-mail] (Juha
Solasaari) writes:

<snip>

>           Magnavox 12BA6              pentode (rf/if amplifier), 12 V filament
>           Magnavox 12BE6              heptode (frequency changer)
>           Magnavox 12AV6              double diode, triode (detector, first
>                                  af stage)
>           RCA Electron Tube 35C5      output pentode, 35 V filament (approx.)
>           Sentinel 12BE6
>           TEN 12BE6
>           General Electric MA?        ?
>           ?? 12BA6
>           ?? 12AV6
>           ?? 35 W4 (2)                ? Just now I can't find this type.

>   The nominal heater voltage for 12xxx types is 12.6 volts.

>   > Is there a simple way to tell if the tubes are good ?

Not really but the two tests below will find most bad tubes. It will not
pick up weak tubes but even then a repair shop replaced tubes, perhaps
20 % of the tubes they replaced were actually bad (I know because the
local TV repair shop's trash can was a favorite hangout on trash day
and nearly all the tubes I scrounged tested good on a real tube tester!)

1. Use an ohmmeter to test for filament continuity.  The nice thing about
tubes (aside from their cheery glow) is that you can see inside - you can
locate the filametn by tracing from the pins - it will be the whitish
fine wire in the center of each of the sections.  Or, it is almost always
pins 3,4 on a 7 pin tube and 4,5 on a 9 pin tube.

2. Look for a silvery metal spot inside the tube.  If you see this, the vacuum
is intact.  If it is milky white or red, the tube has lost its vacuum.

These are all very common tube types.  Even today, they sell for less
than $10 new.  Years ago they were around $1-2.

--- sam


From [e-mail] Fri Jan 26 13:48:33 1996
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From: [e-mail] (SMaas)
Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: I found some old vacuum tubes ...
Date: 25 Jan 1996 20:16:21 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Mike Mackaplow ([e-mail]) wrote:
> While helping clear my mom's garage, I found some
> vacuum tubes:

         Magnavox 12BA6         pentode (rf/if amplifier), 12 V filament
         Magnavox 12BE6         heptode (frequency changer)
         Magnavox 12AV6         double diode, triode (detector, first
                                af stage)
         RCA Electron Tube 35C5 output pentode, 35 V filament (approx.)
         Sentinel 12BE6
         TEN 12BE6
         General Electric MA?   ?
         ?? 12BA6
         ?? 12AV6
         ?? 35 W4 (2)


These are pretty common old tubes.  Many are used in the classical "All
American five" five-tube radio chassis.  They're available from a few
sources these days, mostly made in Easter Europe.  Not worth squat.
Sorry.

Steve


From [e-mail] Fri Jan 26 13:48:34 1996
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From: [e-mail] (Juha Solasaari)
Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: I found some old vacuum tubes ...
Followup-To: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Date: 25 Jan 1996 15:09:55 GMT
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Mike Mackaplow ([e-mail]) wrote:
> While helping clear my mom's garage, I found some
> vacuum tubes:

         Magnavox 12BA6         pentode (rf/if amplifier), 12 V filament
         Magnavox 12BE6         heptode (frequency changer)
         Magnavox 12AV6         double diode, triode (detector, first
                                af stage)
         RCA Electron Tube 35C5 output pentode, 35 V filament (approx.)
         Sentinel 12BE6
         TEN 12BE6
         General Electric MA?   ?
         ?? 12BA6
         ?? 12AV6
         ?? 35 W4 (2)           ? Just now I can't find this type.

The nominal heater voltage for 12xxx types is 12.6 volts.

> Is there a simple way to tell if the tubes are good ?  How

I think there is not. Filaments (heaters) can be checked with an ohm-
meter (and possible shorts between electrodes).
Were the tubes in their carton boxes or loose?
Tubes without boxes are probably used - some of them can be good still.
A tube tester would tell something, but it is hard to find one nowadays.
(And even harder to find a person who knows how to use it.)

> would I find out if they have any value ?  How would one go about
> or, more likely, donating them ?

> Thanks,

> Mike Mackaplow
> [e-mail]

> P.S.    - I am in the southern San Francisco Bay area

I am in southern Finland.

Regards,
Juha Solasaari


From [e-mail] Fri Jan 26 13:48:35 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.supernet.net!nntp.cntfl.com!news.internetMCI.com!newsfeed.internetmci.com!EU.net!sun4nl!geertj
From: [e-mail] (Geert Jan de Groot)
Subject: Impedance of RG316 tefloncoax?
X-Nntp-Posting-Host: belegen.ripe.net
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Does anyone know the impedance of RG316 tefloncoax?

Thanks,

Geert Jan


From [e-mail] Fri Jan 26 13:48:35 1996
Path: news.epix.net!news.sprintlink.net!cc.iu.net!news
From: [e-mail]   (Bill Newkirk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of RG316 tefloncoax?
Date: 25 Jan 1996 02:33:35 GMT
Organization: Space Coast Amateur Technical Group
Lines: 15
Message-ID: <4e6q5v$[e-mail]>
References: <[e-mail]>
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In <[e-mail]>, [e-mail] (Geert Jan de Groot) writes:
>Does anyone know the impedance of RG316 tefloncoax?
>
>Thanks,
>
>Geert Jan

i believe it's 50 ohms (don't have my coax reference here tho...i could be
mixing it up with RG-400..)

Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
Melbourne, FL                       duty now for the future of amateur radio
Lombardi's 1st Law of Business:
Companies succeed in spite of their best effort.  If they succeed at all.



From [e-mail] Fri Jan 26 13:48:36 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!sierra.net!squaw-d115.sierra.net!user
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of RG316 tefloncoax?
Date: Wed, 24 Jan 1996 07:37:49 -0800
Organization: Engineered Solutions
Lines: 2
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: squaw-d115.sierra.net

It is 50 Ohms.  The main difference is that it is designed for 200C
temperature applications.  Heavy Duty stuff...


From [e-mail] Fri Jan 26 13:48:37 1996
Path: news.epix.net!news.sprintlink.net!ionews.ionet.net!usenet
From: [e-mail] (jim forest)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance of RG316 tefloncoax?
Date: 26 Jan 1996 14:55:57 GMT
Organization: IONet
Lines: 11
Message-ID: <4eaq1t$[e-mail]>
References: <[e-mail]> <4e6q5v$[e-mail]>
NNTP-Posting-Host: tsip52.ionet.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

In article <4e6q5v$[e-mail]>, [e-mail] says...
>
>In <[e-mail]>, [e-mail] (Geert Jan de Groot) writes:
>>Does anyone know the impedance of RG316 tefloncoax?
>>
>>Thanks,
>>
Its 50 ohms, I used tons of in the military.

jim



From [e-mail] Fri Jan 26 13:48:38 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!agate!howland.reston.ans.net!gatech!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!unixg.ubc.ca!van-bc!uniserve!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!news.cyberplus.ca!sp16
From: [e-mail] (Marcos Antonio Gallego)
Subject: Information about building QRP tx/rx's...
Message-ID: <1157cc$[e-mail]>
Date: Sun, 21 Jan 1996 21:59:56 GMT
X-Newsreader: News Xpress Version 1.0 Beta #4
Lines: 6

Hi all,
I'm looking for an article that has some QRP circuits for SSB. I don't know if

QST had published one. If anybody knows what issues, please let me know.
Thanks to you all.
73's.
Marcos        (please, answer by email if possible)



From [e-mail] Fri Jan 26 13:48:40 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!csn!ub!news.kei.com!newsfeed.internetmci.com!news.msfc.nasa.gov!cs.utk.edu!gaia.ns.utk.edu!usenet
From: Mark Mansfield <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Lowfer help.
Date: Sun, 21 Jan 1996 21:03:18 -0600
Organization: Univ. of Tenn at Martin
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: dialup02.utm.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b5 (Win95; I)
CC: [e-mail]

Does anyone know if there is a listserver for Lowfer stuff?
I'm interested in any info and pointers to ftp sites that contain Lowfer
related files.

Thanks,
Mark


From [e-mail] Fri Jan 26 13:48:41 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Lowfer help.
Date: Wed, 24 Jan 1996 16:53:36 -0800
Organization: Call America Internet Services  [phone]
Lines: 14
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Mark, I do not know of any FTP servers but there is a LOWFER BBS run by
John H. Davis who edits "The Notebook" column in the LOWDOWN.  His BBS is:
706 672-0360.  That is a good place to start.  Cliff Buttschardt  W6HDO

On Sun, 21 Jan 1996, Mark Mansfield wrote:

> Does anyone know if there is a listserver for Lowfer stuff?
> I'm interested in any info and pointers to ftp sites that contain Lowfer
> related files.
>
> Thanks,
> Mark
>
>


From [e-mail] Fri Jan 26 13:48:42 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!uunet!in2.uu.net!istar.net!news1.vancouver.istar.net!news.vancouver.istar.net!van-bc!unixg.ubc.ca!news.bc.net!news.bcit.bc.ca!news
From: Colin Schmutter
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: 19 Jan 1996 02:05:45 GMT
Organization: BCIT
Lines: 25
Message-ID: <4dmu9p$[e-mail]>
NNTP-Posting-Host: usr042.bcit.bc.ca
X-Newsreader: <WinQVT/Net v3.9>
Xref: news.epix.net sci.electronics.components:1416 rec.radio.amateur.homebrew:12827

In article <[e-mail]> [e-mail] write
s:
>Elantec are advertising the EL4083C current-mode 4-quadrant multiplier
>which goes up to 200 MHz. It's in an 8-pin DIL package and looks quite
>easy to use. It should nake a good substitute for the Motorola devices.
>Samples are available from Elantec on [phone] ext 311.
>
>I think that the NE602 has been replaced by the NE612.
>
>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.

The TL 442 would make a good alternative to the MC1496.

Made by Texas Instruments, this chip requires a much lower component count.

It has balanced 50 ohm and 600 ohm inputs and is ideal for product
detector circuits.

Colin

[e-mail]



From [e-mail] Fri Jan 26 13:48:43 1996
Path: news.epix.net!uunet!in2.uu.net!news.eng.convex.com!newsrelay.netins.net!news.netins.net!usenet
From: [e-mail] (Mark Kubovich)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: 21 Jan 1996 20:59:12 GMT
Organization: Technology Resource Group
Lines: 18
Message-ID: <4du9f0$[e-mail]>
References: <137cc$[e-mail]> <[e-mail]>
NNTP-Posting-Host: s137.netins.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news.epix.net sci.electronics.components:1430 rec.radio.amateur.homebrew:12834

In article <[e-mail]>, [e-mail] says...
>
>ECG has a ECG973 or ECG973D for the MC1496, NTE has NTE973. For the
>MC1596,I've found nothing.
>Hello wrote:
>>
>> Hello,
>>
>> Is there a remplacement for this chips ?
>>
>> Happy New Year.
>> [e-mail]
>> Happy
>> New              [e-mail]
>> Year
Check National Semiconductor.  Digi-Key (800)-344-4539 has the LM1496 listed i
n
various packages for sale.



From [e-mail] Fri Jan 26 13:48:44 1996
Path: news.epix.net!news.sprintlink.net!lori.albany.net!news1.cris.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!news.mathworks.com!news.kei.com!ub!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!milo.mcs.anl.gov!usenet
From: John Wammack <[e-mail]>
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: Thu, 18 Jan 1996 22:12:27 -0600
Organization: Argonne National Laboratory
Lines: 13
Message-ID: <[e-mail]>
References: <137cc$[e-mail]>
NNTP-Posting-Host: ecp40.aps1.anl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)
Xref: news.epix.net sci.electronics.components:1449 rec.radio.amateur.homebrew:12850

ECG has a ECG973 or ECG973D for the MC1496, NTE has NTE973. For the
MC1596,I've found nothing.
Hello wrote:
>
> Hello,
>
> Is there a remplacement for this chips ?
>
> Happy New Year.
> [e-mail]
> Happy
> New              [e-mail]
> Year


From [e-mail] Fri Jan 26 13:48:45 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!jussieu.fr!rain.fr!world-net!usenet
From: [e-mail]
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MC1496/1596 obsolete ?
Date: Fri, 26 Jan 1996 11:03:55 GMT
Organization: World-Net information exchange, Internet provider.
Lines: 12
Message-ID: <4eacmg$[e-mail]>
References: <137cc$[e-mail]> <4ch84d$[e-mail]>
NNTP-Posting-Host: client118.sct.fr
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net sci.electronics.components:1551 rec.radio.amateur.homebrew:12932

In article <137cc$[e-mail]>, Hello <[e-mail]>
wrote:
>
>Is there a remplacement for this chips ?...

Hello,
Thanks for your answers.

Have
a nice                    [e-mail]
Day



From [e-mail] Fri Jan 26 13:48:46 1996
Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.internetmci.com!server2.ols.net!usenet
From: Andy Brinkley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MCX100 PROM programming ?
Date: 25 Jan 1996 03:28:17 GMT
Organization: Online South Incorporated
Lines: 15
Message-ID: <4e6tch$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: brinkley.ols.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

[e-mail] (Hugh Duff) wrote:
>
>
>I recently aquired a 16 channel Motorola MCX100 commercial VHF radio.
>Wondering if anyone has any info on programming a PROM for it ?


Hugh -

I can't help much with the addressing of the PROM etc, but if you need a PROM
burned I have the equipment to burn one for the MCX-100


Andy   (N4ROX)   "[e-mail]"



From [e-mail] Fri Jan 26 13:48:47 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!unixg.ubc.ca!rover.ucs.ualberta.ca!tribune.usask.ca!news.uregina.ca!MERCURY.CS.UREGINA.CA!john
From: [e-mail] (John Rosloot)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc
Subject: Morse code to text display wanted
Date: 21 Jan 1996 19:45:49 GMT
Organization: University of Regina
Lines: 15
Message-ID: <4du55d$[e-mail]>
NNTP-Posting-Host: mercury.cs.uregina.ca
Xref: news.epix.net rec.radio.amateur.homebrew:12829 rec.radio.amateur.equipment:23924 rec.radio.amateur.digital.misc:13688

Hi. My dad is a Ham operator, and asked me if there were some inexpensive
way to have incoming Morse code automatically translated and displayed on
a CRT. Since I know nothing about Ham radio, I thought I'd post here. I'm
sure what he wants to do must be possible; don't know about the inexpensive
part though. If anyone can help us out I'd appreciate it. I'd prefer that
responses be sent in private email, as I usually don't read these groups.

Thanks in advance.

--
John Rosloot, technical analyst
Dept. of Computer Science, University of Regina
Regina, Saskatchewan, Canada
http://www.cs.uregina.ca/~john/
[e-mail]


From [e-mail] Fri Jan 26 13:48:48 1996
Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!paperboy.ids.net!chowda!bob.berlyn
From: [e-mail] (Bob Berlyn)
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorola Conversion Help
Date: Sat, 20 Jan 1996 04:55:35 GMT
Message-ID: <[e-mail]>
Organization: Chowdanet BBS - 401-331-2604
Distribution: world
Lines: 14

Hello All,

I am looking for information on converting Motorola Syntor business band
radios to 2 meters.

I thought I saw something about it some where but can't remember just
where or when.

If any of you have this info or know where I can find it please E-Mail
me.

Thanks

[e-mail]


From [e-mail] Fri Jan 26 13:48:48 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!pacifier!rainrgnews0!news.proaxis.com!news
From: [e-mail] (Kim Boone)
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorola Micor
Date: 23 Jan 1996 02:22:57 GMT
Organization: ProAxis Communications, Inc.
Lines: 6
Message-ID: <4e1gq1$[e-mail]>
NNTP-Posting-Host: ppp66.proaxis.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Looking for info/parts for Motorola Micor radios.  Please contact me by e-mail
.

Thanks,
Kim, N0ZSF
[e-mail]



From [e-mail] Fri Jan 26 13:48:49 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!EU.net!sun4nl!xs4all!usenet
From: [e-mail] (Max Baars)
Newsgroups: rec.radio.amateur.homebrew
Subject: Nature radio
Date: Tue, 23 Jan 1996 02:13:37 GMT
Organization: At home
Lines: 17
Message-ID: <4e1g5d$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: asd05-06.dial.xs4all.nl
X-Newsreader: Forte Agent .99b.112

Hello,
I would like to read more about nature-radio.
Can someone point me to information on the net of to recent magazine
articles?

Thank you, and 73..


---------------------------------------------------------
M. H. A. Baars  =  Max PA3GEC  = e-mail   [e-mail]
Interested in:                 = packet bbs pa3gec@pi8zaa
Homebrew T&M and radio equipment, live music, girls, beer

To invent, you need a good imagination and a pile of junk
                                         -- Thomas Edison
---------------------------------------------------------



From [e-mail] Fri Jan 26 13:48:50 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ne 602/612
Date: Mon, 22 Jan 1996 17:45:30 -0800
Organization: Call America Internet Services  [phone]
Lines: 27
Message-ID: <[e-mail]>
References: <3lau5n7$[e-mail]> <4dpeg0$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4dpeg0$[e-mail]>

If you have trouble with the http address and need to use the fax, try:
1-800-282-2000.  There is a listing for the 602, but I have yet to find a
listing for the 612.  Like it does not exist!  Cliff Buttschardt W6HDO

On 20 Jan 1996, Wanda M Desmond wrote:

> In <3lau5n7$[e-mail]> [e-mail] (Workshop) writes:
> >
> >Can anyone tell me if there is a site on the net where I can
> >get application notes on the ne 602 or 612 chips.They are not in any
> of
> >the data books that I have got.
> >
> >You can e-mail me at [e-mail] , or post to this group.
> >
> >thanks
> >
> >Robin
>
> The URL for Philips is Http://www.semiconductors.philips.com/ps/
>
> You can download .pdf (Adobe Acrobat Reader) files of datasheets,
> application notes and etc.
>
> John B. Lawrence
>
>


From [e-mail] Fri Jan 26 13:48:51 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Jon Shay )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 10 meter conversion info for Cobra 148gtl
Date: 22 Jan 1996 18:16:03 GMT
Organization: Netcom
Lines: 16
Message-ID: <4e0k93$[e-mail]>
References: <4djt6j$32v$[e-mail]> <4dkf20$[e-mail]>
NNTP-Posting-Host: tuc-az1-22.ix.netcom.com
X-NETCOM-Date: Mon Jan 22 10:16:03 AM PST 1996

In <4dkf20$[e-mail]> [e-mail](Tim Hynde
ka8ddz/qrp Rochester, MI ) writes:
>
>
>There is a guy in AZ somewhere that advertises a book called CB to 10
>mtrs, I see the ad alot. I wrote for a catalog of his offerings about
a
>year ago and he seemed to have alot of conversion information. Check
>the ham mags for his ad.
>
>73, Tim

His Email is [e-mail]
Good luck!

KC5MOP


From [e-mail] Fri Jan 26 13:48:52 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!starbase1.ping.ch!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 10 meter conversion info for Cobra 148gtl
Date: 19 Jan 1996 20:21:00 GMT
Lines: 23
Message-ID: <4doufc$[e-mail]>
References: <4djt6j$32v$[e-mail]> <4dkf20$[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

*snip*
>There is a guy in AZ somewhere that advertises a book called CB to 10
>mtrs, I see the ad alot. I wrote for a catalog of his offerings about a
>year ago and he seemed to have alot of conversion information. Check
>the ham mags for his ad.
*snip*

The company goes by "CBCI".  That is an acronym for

  "CB City International"

They've been around for years, catering to the
bootleg CB market.  They sort of "morphed" into
the ham market via CB-to-Ten conversions, since
the technology is the same.  The owner of this
establishment is Lou Franklin, K6NA, who is one
of the most prominent CB writers.

                   73 de KC5NG

PS... I saw his catalog a number of years ago.
      His prices were, IMHO, astronomical!!!



From [e-mail] Fri Jan 26 13:48:53 1996
Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!stevens-tech.edu!newsserver.jvnc.net!newsserver2.jvnc.net!howland.reston.ans.net!newsfeed.internetmci.com!gatech!purdue!news.bu.edu!transfer.stratus.com!bigboote.WPI.EDU!res.WPI.EDU!hi
From: ee formerly known as jeff feigin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 10 meter conversion info for Cobra 148gtl
Date: Tue, 23 Jan 1996 23:16:05 -0500
Organization: Worcester Polytechnic Institute
Lines: 3
Message-ID: <[e-mail]>
References: <4djt6j$32v$[e-mail]> <4dkf20$[e-mail]> <4doufc$[e-mail]>
NNTP-Posting-Host: res.wpi.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4doufc$[e-mail]>

i've seen the "kits," its $50 for a crystal.

jeff


From [e-mail] Fri Jan 26 13:48:54 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!spool.mu.edu!news.sol.net!daily-planet.execpc.com!homer.alpha.net!pacifier!rainrgnews0!psgrain!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!news.onramp.net!usenet
From: Bob Winingham <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEED APRS setup help
Date: 25 Jan 1996 07:08:11 GMT
Organization: On-Ramp; Individual Internet Connections; Dallas/Ft Worth/Houston, TX USA
Lines: 21
Message-ID: <4e7a8s$[e-mail]>
References: <4dv48g$[e-mail]>
NNTP-Posting-Host: dal14.onramp.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
To: [e-mail]
X-URL: news:4dv48g$[e-mail]

>>I need assistance in getting an ICOM Z1A HT configured to my Kantronics KPC-
3
>>and laptop computer. I'm anew HAM and don't understand some of the
>>configuration requirements like UNPROTO. Some guys here are trying to help,
but
>>no one is yet shall we say an expert with it yet.

MFJ should have a cable for your radio to TNC
I use same one for my HTX-202 and IC-W21AT

The APRS experts  have a SIG  on TAPR.ORG  called aprssig
( I am not an expert but I do have a set of notes on using the KPC-3 with
a GPS as a remote tracker)

set unprot to RELAY to get started then to a APRS digi station in your area.
Some of the setups for APRS (PC) or MACAPRS will do this for you.

73

[e-mail]





From [e-mail] Fri Jan 26 13:48:56 1996
Path: news.epix.net!uunet!in2.uu.net!li.net!thom
From: [e-mail] (Thom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Help Indentifying Transistor
Date: 21 Jan 1996 20:07:09 GMT
Organization: LI Net (Long Island Network)
Lines: 30
Message-ID: <4du6dd$[e-mail]>
NNTP-Posting-Host: linet01.li.net
X-Newsreader: TIN [version 1.2 PL2]

Hi and thanks in advance for your help,
  I am in the process of building a keyer and it calls for a 2N2222
transistor....In my junk box I've come accross several 2N2222A's.  First
off, Am I right in making this assumption that these are OK to use?

The transistors I found are in a metal case wich and came in a package
which says NPN TO-18...So I guess TO-18 is the case type.

Its a metal case with a small tab coming out of the bottom...I see
similar cases called TO-18 in the 1996 ARRL Handbook so I'm OK on that
score, I think.

Anyway my question is how do identify the leads?  If I look down to the
underside of the transistor and position the tab at 4 O'clock, the 3
leads are at 12, 6 and 9 O'clock.

If you can can tell me which leads are the emmitter, collector and base
I'd appreciate it...more importantly, if you could tell me how to figure
it out, myself, I woun't have to bother you the next time.

As I said I look in the Handbook, got close but couldn't find the answere.


Thanks for ypur help

Tom
WB2QDG

[e-mail]



From [e-mail] Fri Jan 26 13:48:57 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help Indentifying Transistor
Date: Wed, 24 Jan 1996 16:49:19 -0800
Organization: Call America Internet Services  [phone]
Lines: 37
Message-ID: <[e-mail]>
References: <4du6dd$[e-mail]> <4e00lb$[e-mail]> <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Hi Thom and Gary.  Noted your comments regarding the plastic 2N2222 and
metal can devices.  All true what was said.  I do want to put up a
warning and that is the lead configuration is NOT the same.  Be careful
when you subsititute!!     73  Cliff Buttschardt   W6HDO

On Tue, 23 Jan 1996, Gary Coffman wrote:

> In article <4e00lb$[e-mail]> "Thomas C. J. Sefranek" <sefranek@iii.n
et> writes:
> >Hi Thom
> >        The lead nearest the tab is the emitter, the lead farthest from
> >the tab is the collector, the lead in between is the base.
> >A 2N2222A is a better device, no one makes 2222's, only the A devices.
> >Any specifications book (Motorola, Harris, National) has a wealth of
> >information on transistors.  Also, check the web sites for these guys.
> >
> >Tom
> >WA1RHP
>
> The 2N2222 is still available (in plastic packaging) as far as I
> know. And I've seen 2N2222s in TO-5 packaging, but I don't think
> those are made anymore. For metal can packaging, I believe you're
> correct that only the 2N2222A is currently produced. The main
> difference is that the A device has a tighter beta specification
> and is offered in the TO-18 cans.
>
> The 2N2222 family is *the* generic NPN switching transistor, though
> the 2N3904 and 2N3906 are also very popular. For most uses, any of
> the generic devices will work.
>
> Gary
> --
> Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
> Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
> 534 Shannon Way             |    Guaranteed!      | [e-mail]
> Lawrenceville, GA 30244     |                     |
>
>


From [e-mail] Fri Jan 26 13:48:58 1996
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news1.isp.net!news.internetMCI.com!newsfeed.internetmci.com!newsserver.jvnc.net!jvnc.net!ka1kjz
From: [e-mail] (Ronald C. Barnes)
Subject: Need Novatel 8305A cellphone info badly
Message-ID: <[e-mail]>
Sender: [e-mail] (Zee News Genie)
Organization: JvNCnet
X-Newsreader: News Xpress Version 1.0 Beta #4
Date: Thu, 18 Jan 1996 22:46:48 GMT
Lines: 16
Xref: news.epix.net rec.radio.amateur.digital.misc:13698 rec.radio.amateur.equipment:23944 rec.radio.amateur.homebrew:12838 rec.radio.amateur.misc:97106 rec.radio.swap:55621

Well, here I go again, I've been looking for this information for some time
now and hopefully SOMEONE has SOMETHING.

I have a few Novatel model 8305A cellular phones that I wish to convert over
to 900MHz.  They are black, square, about 10" x 10" x 2".

At the very least I need a schematic, but full service information would be
nice too.  I understand that there was a Novatel Amateur Radio Club at one
time and they did just this, converted them over to 900MHz for packet.

Any info would be appreciated and I of course will pay costs of copying and
shipping if necessary.

Please reply via e-mail...   [e-mail]

73zzz   Ron


From [e-mail] Fri Jan 26 13:48:59 1996
Path: news.epix.net!uunet!in1.uu.net!sunrise.gv.ssi1.com!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need PCB trace size to current info .
Date: Sun, 21 Jan 1996 22:36:41 GMT
Organization: RST Engineering
Lines: 25
Message-ID: <4duf63$[e-mail]>
References: <4dqvjl$[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:

>I need info on what trace size can handle in amps. Email at
>[e-mail]   Thanks !

(a) If you can't take the time to read the newsgroups you post in,
don't post.  Asking for email answers in a newsgroup wastes all our
times in reading.

(b) It is a function of the thickness of the copper on the board.  For
"one ounce" copper board, I've generally used 15 mils of copper width
for each 100 mA of current and never had a problem.  I'm sure when you
get to current measured in amperes this rule of thumb breaks down, but
for medium currents (less than an amp) it has always been OK for me.

Jim



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



From [e-mail] Fri Jan 26 13:49:00 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: need schematic for HP 3310
Date: Wed, 24 Jan 1996 17:23:03 -0800
Organization: Call America Internet Services  [phone]
Lines: 8
Message-ID: <[e-mail]>
References: <3lau5n7$[e-mail]> <4dpeg0$[e-mail]> <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Does anyone have a schematic for the Hewlett Packard function generator
HP 3310?  As I understand it, there were not too many made.  I assume
that I can fix the device with just a schematic and would appreciate
knowing where I might obtain one.  73   Cliff Buttschardt   W6HDO
                                        Cuesta College--Engineering Tech
                                        P. O. Box 8106
                                        San Luis Obispo, CA 93406
TNX


From [e-mail] Fri Jan 26 13:49:01 1996
Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.internetmci.com!panix!not-for-mail
From: [e-mail] (Elmar Vaher)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Toshiba S-AV17 amp module source
Date: 24 Jan 1996 12:33:11 -0500
Organization: PANIX Public Access Internet and Unix, NYC
Lines: 11
Message-ID: <4e5qgn$[e-mail]>
NNTP-Posting-Host: panix.com
Summary: Need parts supplier for Toshiba S-AV17 amp module.
Keywords: Amp module source Toshiba

Cant seem to find this module anywhere. Digi-Key or Mouser does not have
it.
This is for building the 2M brick in the 1996 Handbook.
Toshiba S-AV17 amp module.
Any help in getting a source as well as hints on building the brick would
be greatly appreciated.


--
        Elmar Vaher             ********--------**********
        [e-mail]


From [e-mail] Fri Jan 26 13:49:02 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.cinenet.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!swrinde!sdd.hp.com!col.hp.com!canyon.sr.hp.com!glenne
From: [e-mail] (Glenn Elmore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Toshiba S-AV17 amp module source
Date: 24 Jan 1996 23:10:33 GMT
Organization: Hewlett Packard Sonoma County
Lines: 23
Message-ID: <4e6e99$[e-mail]>
References: <4e5qgn$[e-mail]>
NNTP-Posting-Host: n6gn.sr.hp.com
X-Newsreader: TIN [version 1.2 PL2.2]

Elmar Vaher ([e-mail]) wrote:
: Cant seem to find this module anywhere. Digi-Key or Mouser does not have
: it.
: This is for building the 2M brick in the 1996 Handbook.
: Toshiba S-AV17 amp module.
: Any help in getting a source as well as hints on building the brick would
: be greatly appreciated.


Try RF Parts Inc in San Marcos, CA. They advertize in most of the major
amateur magazines. They may even have PIN switches and other supporting
hardware modules that they don't advertize.

  My 'hint' would be to interface to the brick(s) with a PC board and to
be careful about getting good grounds; both in the contact between the
brick itself and your heatsink and in the back side ground of the PC
board you use.  You should be able to transition directly to 50 ohm
microstrip from the brick that way.

  Also, be sure to bypass and decouple your supplies well. It may be possible
with some bricks to destroy them with low frequency oscillations.

Glenn Elmore n6gn


From [e-mail] Fri Jan 26 13:49:03 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!globe.indirect.com!usenet
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: New Meter Faces
Date: Tue, 23 Jan 1996 16:56:04 GMT
Organization: The Coriolis Group, Inc.
Lines: 13
Message-ID: <4e341r$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 165.247.88.102
X-Newsreader: Forte Free Agent 1.0.82

Probably a better way to create meter faces and other scales is to
draw them by a simple computer program.  Borland's Delphi product
makes drawing and printing Windows graphics under program control very
easy, and you can calculate the spacing of the lines and so on if you
know your graphics math.

Just a thought.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona



From [e-mail] Fri Jan 26 13:49:04 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!gatech!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (TheBots)
Newsgroups: rec.radio.amateur.homebrew
Subject: pc boards
Date: 23 Jan 1996 23:33:14 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 2
Sender: [e-mail]
Message-ID: <4e4cqa$[e-mail]>
Reply-To: [e-mail] (TheBots)
NNTP-Posting-Host: newsbf02.mail.aol.com

Does anyone know of a supplier for bare copper-clad pc boards in odd
sizes?


From [e-mail] Fri Jan 26 13:49:05 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip51.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST UHF Noise generator
Date: Tue, 23 Jan 1996 23:19:19 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 36
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <4e33h0$[e-mail]>
NNTP-Posting-Host: usr4ip51.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4e33h0$[e-mail]> Allen Wallace <[e-mail]>
 writes:
>From: Allen Wallace <[e-mail]>
>Subject: Re: QST UHF Noise generator
>Date: 23 Jan 1996 16:48:32 GMT

[snip]

>Yes. I know I'm cheap and ought to use the NoiseCom diode, however I
>haven't purchased one yet! I do have a few 1N21 diodes and I was
>wondering the how they compare.

Not even close.

>I figure I need to amplify a noise source of 20 ENR about 40-50 db to use
>this as a broad-band signal source to use in lue of a tracking generator
>for my  spectrum analyzer.

I think we discussed this idea here before and decided it wasn't as easy as it

looks, but my memory is dram without a refresh these days.

>The Mini-Circuts MAR-4 (8 db gain) only drops 0.2 db from 100 Mhz to 1500
>Mhz, and drops only another 0.3 do to 2000 Mhz. If I cascade 6 of these
>babies, I'll get about 50 db of gain, however any more and I'll exceep
>the 1db compression. This would give me a flat noise source with less
>than 2 db of dropoff.

You better take a look at the effects of the mismatches between a handful of
these things. The specified 1.6 in and 2.0 out SWRs look like cascaded
ripple trouble to me. I have only the tabular data in front of me but I note
that the figures are "typical". Your mileage (and gain) may vary.

>Maybe I'll try a MAV-11 MMIC as the final amplifer, as it has a 18 dbm
>max power, but it is not very flat.

>Has any one had any experience with this sort of thing?



From [e-mail] Fri Jan 26 13:49:06 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!spool.mu.edu!howland.reston.ans.net!gatech!newsxfer2.itd.umich.edu!agate!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!ian.simcock
From: ian.simcock%1:2619/211.9 (ian simcock%1:2619/211.9)
Date: 21 Jan 96 12:26:54
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio circuit required
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 41

To: ian simcock%1:2619/211.9%12:320/100.666
From: [e-mail] (ian simcock)
Subject: Radio circuit required

I'm hopeing that someone could point me to either
1) An Internet site with circuit diagrams
2) A book with appropriate circuits
3) A person who could design an appropriate circuit
4) A company that sells what I want.

What I need is a small radio that fits the following specs -
1) Any frequency (preferably an unlicenced peice of spectrum)
2) Digital transmition of 500 bytes per second
3) 200 meter range under bad indoor conditions
4) Digital tuning
5) Runs on 4-6 volts
6) Low power consumption
7) Rapid startup/shut down for the transmiter
8) 10 channels


If possible I'd like the following improvements
1) 1000+ bytes per second
2) 500+ meter range
3) Run on 3-6 Volts
4) 30+ channels
5) Able to easily transmit analogue (voice) signals

Thanks for reading this far.
I'll appriciate any help anyone can give me,
   Ian Simcock.

 # Origin: WoodyWare Software, Inc. <-> Internet Gateway (1:2619/211.9)

 # Origin: Gateway ARNet <-> HamNet by HB9EBW (12:320/100.666)
--
|Fidonet:  ian simcock%1:2619/211.9 2:301/249.666
|Internet: ian.simcock%1:2619/211.9
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Fri Jan 26 13:49:07 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!hptemp1.cc.umr.edu!dstuart
From: [e-mail] (Dave Stuart ([e-mail]))
Newsgroups: rec.radio.amateur.homebrew
Subject: Recieve Antenna
Date: 24 Jan 1996 18:00:47 GMT
Organization: UMR Missouri's Technological University
Lines: 9
Message-ID: <4e5s4f$[e-mail]>
NNTP-Posting-Host: saucer.cc.umr.edu
X-Newsreader: TIN [version 1.2 PL2]

For approximately 100 MHz, a good antenna would be around 1.5 m. Right?

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

KB0SLY



From [e-mail] Fri Jan 26 13:49:08 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!zippy.cais.net!news
From: Jim Sutton/AC4CZ
Newsgroups: rec.radio.amateur.homebrew
Subject: Relays That Hum
Date: 25 Jan 1996 19:19:44 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 8
Message-ID: <4e8l4g$[e-mail]>
NNTP-Posting-Host: pppb47.erols.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

I have several 115 ac relays that at times produce an objectional hum.  The co
il wire looks
like #28 to perhaps #32 and the dc resistance varies from 75 to 85 ohms.  Any
thoughts on
the voltage/current  likely to required to operate on dc?

Thanks for your help.

73/Jim Sutton/AC4CZ
[e-mail]


From [e-mail] Fri Jan 26 13:49:09 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news1!ind-005-236-207
From: [e-mail] (Patrick Croft)
Subject: RG63/B COAX - OHMS=?
X-Nntp-Posting-Host: ind-005-236-207.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
X-Newsreader: News Xpress Version 1.0 Beta #2.1
Date: Thu, 25 Jan 1996 17:07:11 GMT
Lines: 6

Seeking a little help on tech spec's of this stuff.  Have checked all handbook
s,
 major manufacturer's catalogs  back thru the 60's, can't find it!  This is TI
MES brand,
but not in their catalog either.  If you can shed some light I'd really apprec
iate it!

73
Patrick  WB9IQI


From [e-mail] Fri Jan 26 13:49:10 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!imci4!imci5!newsfeed.internetmci.com!in2.uu.net!jaxnet.jaxnet.com!usenet
From: "John R. Moore" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RG63/B COAX - OHMS=?
Date: Thu, 25 Jan 1996 20:56:25 -0500
Organization: Southeast Network Services, Inc.
Lines: 11
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ts5-024.jaxnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6b (Win16; I)

Patrick Croft wrote:
>
> Seeking a little help on tech spec's of this stuff.  Have checked all handbo
oks,
>  major manufacturer's catalogs  back thru the 60's, can't find it!  This is
TIMES brand,
> but not in their catalog either.  If you can shed some light I'd really appr
eciate it!
>
> 73
> Patrick  WB9IQIPatrick
according to my book RG-63B impedance is 125 ohms Capacitance is
10 pf/ft 6.4 db loss per 100 ft at 1000 mhz.
John W5HUQ


From [e-mail] Fri Jan 26 13:49:11 1996
Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!news.zeitgeist.net!mycogen.terminus.com!usenet
From: [e-mail] (Dave Hayes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RG63/B COAX - OHMS=?
Date: Fri, 26 Jan 1996 01:21:30 GMT
Organization: Second Foundation Internet, Lompoc, CA  [phone]
Lines: 17
Message-ID: <3108270e.1429093@news>
References: <[e-mail]>
NNTP-Posting-Host: pm-lo-36.terminus.com
X-Newsreader: Forte Agent .99c/16.141

[e-mail] (Patrick Croft) wrote:

>Seeking a little help on tech spec's of this stuff.  Have checked all handboo
ks,
> major manufacturer's catalogs  back thru the 60's, can't find it!  This is T
IMES brand,
>but not in their catalog either.  If you can shed some light I'd really appre
ciate it!
>
>73
>Patrick  WB9IQI

The 1956 edition of Reference Data for Engineers lists the following
specifications for RG63B/U coaxial cable:

Type - low capacitance single braid
Nominal impedance - 125 ohms
capacitance 10 pf/ft.
dielectric material - air spaced polyethylene
velocity .84c


From [e-mail] Fri Jan 26 13:49:12 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Switch-mode audio amps
Date: 24 Jan 1996 13:29:29 GMT
Organization: Netcom
Lines: 10
Message-ID: <4e5c7p$[e-mail]>
NNTP-Posting-Host: pax-ca3-15.ix.netcom.com
X-NETCOM-Date: Wed Jan 24  5:29:29 AM PST 1996


    I'd like to build a switch-mode amp that can deliver, say, about 2
watts to a 3.2 ohm speaker (it'll be powered by 12 volts).  Does anyone
know where to find articles or references discussing these types of
amps?  Ed Oxner's "Power FETs" book discusses them a bit, but I'd like
more info.

Thanks!

- Jeff, WA6AHL


From [e-mail] Fri Jan 26 13:49:12 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!swrinde!news-relay.us.dell.com!pmafire!anlpub.anlw.anl.gov!borah.ebr.anlw.anl.gov!jmott
From: Jack Mott <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: test
Date: Wed, 24 Jan 1996 23:08:25 -0700
Organization: Argonne National Laboratory West
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: borah.ebr.anlw.anl.gov
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

This is only a test.


From [e-mail] Fri Jan 26 13:49:14 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!zippy.cais.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Test Posting
Date: 25 Jan 1996 19:05:02 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 2
Message-ID: <4e8k8u$[e-mail]>
NNTP-Posting-Host: pppb47.erols.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

This is a test posting.
Jim/AC4CZ


From [e-mail] Fri Jan 26 13:49:15 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!zippy.cais.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Test Posting
Date: 25 Jan 1996 19:11:15 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 7
Message-ID: <4e8kkj$[e-mail]>
References: <4e8k8u$[e-mail]>
NNTP-Posting-Host: pppb47.erols.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   [e-mail] writes:
>  This is a test posting.
>  Jim/AC4CZ
>
>>>>
Follow up to msg.
JCS/AC4CZ


From [e-mail] Fri Jan 26 13:49:15 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!news.uoregon.edu!news.rio.com!usenet
From: [e-mail] (Monte Olsen)
Newsgroups: rec.radio.amateur.homebrew
Subject: TNC for Kenwood th22a and/or 520S HF rig?
Date: Sun, 21 Jan 1996 19:36:13 GMT
Organization: Northwest Internet Services, Inc.
Lines: 12
Message-ID: <31029569.53352539@206.96.130.1>
Reply-To: [e-mail]
NNTP-Posting-Host: p14.t0.rio.com
X-Newsreader: Forte Agent .99c/16.141

Hi all,

Does anyone know of a TNC and modem kit for a handheld TH22AT and a
Kenwood TS-520S. One that might work with both? Packet radio sure
sounds interesting.

thanks for any info.

Monte Olsen
N7FFO




From [e-mail] Fri Jan 26 13:49:16 1996
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Clay Whiffen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Toroid permeability ???
Date: Tue, 23 Jan 1996 02:50:06 GMT
Organization: MindSpring Enterprises, Inc.
Lines: 15
Message-ID: <4e1ibe$[e-mail]>
References: <[e-mail]> <4dvntf$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: user-168-121-82-155.dialup.mindspring.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] () wrote:

>>....but some surplus stores in Toronto have a wide
>>assortment of bins of unmarked toroids. It would be a nice
>>cost-effective altenative to having to order new ones if we knew what we
>>had sitting at our doorstep.

>May be I am wrong, But I expect that 99% of surplus toroids
>are intended for frequencies below 1 MHz (switch mode PSU's?)

>73, Moritz DL5UH
>
I have found lots of different kinds here.  -43 ferrites, powered
iron, etc.



From [e-mail] Fri Jan 26 13:49:17 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Toroid permeability ???
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sat, 20 Jan 1996 17:05:25 GMT
Lines: 40

In article <[e-mail]> [e-mail]
 (Hugh Duff) writes:
>Does anyone know how to measure the permeability/loss of a toroid core
>(without too much difficulty !) ?
>They are difficult to get locally ( I usually have to order them from
>Amidon in Cal.) but some surplus stores in Toronto have a wide
>assortment of bins of unmarked toroids. It would be a nice
>cost-effective altenative to having to order new ones if we knew what we
>had sitting at our doorstep.
>
>A friend on a local BBS originally posed this question to me...
>I couldn't really answer him ...I am also curious !
>I thought that winding some wire onto them and taking impedance
>measurements at various frequencies may work but how does one accomplish
>this ?

What you want to do, Hugh, is find the proportionality constant between
the number of turns and inductance. Wind the core with several
different numbers of turns, and measure the inductance for each. You
can use an inductance meter, or just resonate the coil with a known
capacitor and use a dip meter. Now graph the inductance versus the
number of turns and devise an equation to fit the curve. The inductance
should be proportional to the square  of the number of turns, with
the proportionality constant being the unkown you are trying to find.

L = k * (N)^2   or k = L/(N)^2

To determine the suitability of the material for various frequencies,
excite the coil at those frequencies and measure the Q of the coil.
Actually, the size of the proportionality constant you found above
should already give you a clue. A large proportionality constant
indicates a core suitable for low frequencies while smaller proportionality
constants will indicate the core is suitable for increasingly higher
frequencies.

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


From [e-mail] Fri Jan 26 13:49:19 1996
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From: [e-mail](michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Date: 22 Jan 1996 22:17:20 GMT
Organization: Netcom
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In <4e0skc$[e-mail]> Jason Douglas <[e-mail]>

>Mike:  You're far more ambitious than I.  I used to just take a little
>portable AM radio and vary the tuning until its LO was heterodyning
>with something in the target receiver.  I admit that's pretty lazy,
>but it works.  Regards,
>John Kelly K4XC

Well, I don't know about ambitious.  I just had a lot more 6AU6s than
portable radios :)  I was one of those kids who became an old-TV magnet
when I was growing up.  So many tubes to pull, so many components to
unsolder, so many rivets to drill out...

73,
Mike, KK6GM



From [e-mail] Fri Jan 26 13:49:19 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Date: 23 Jan 1996 18:51:01 GMT
Organization: Canadian Utilities Ltd
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In <[e-mail]>, [e-mail] (Joe Mack) writes:
>I did this when I was a kid, tuning in hams on a SW receiver
>before I got my ham license. You don't need a crystal oscillator,
>any oscillator will do and I just draped a wire from the oscillator
>into the back of the box of the radio - no solid connection.
>
>
I did it by adding regeneration to  the last iF stage, and then advancing the
gain until
it just started to oscillate.  Worked, and even dramatically increased the sel
ectivity...




Villy  VE6SQ


From [e-mail] Fri Jan 26 13:49:20 1996
Path: news.epix.net!news.sprintlink.net!cc.iu.net!news
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Date: 25 Jan 1996 01:44:03 GMT
Organization: Organized?  I can't even find my car keys
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In article <4e3aml$[e-mail]>, [e-mail] says...
>
>In <[e-mail]>, [e-mail] (Joe Mack) writes:
>>I did this when I was a kid, tuning in hams on a SW receiver
>>before I got my ham license. You don't need a crystal oscillator,
>>any oscillator will do and I just draped a wire from the oscillator
>>into the back of the box of the radio - no solid connection.
>>
>>
>I did it by adding regeneration to  the last iF stage, and then advancing the

gain until
>it just started to oscillate.  Worked, and even dramatically increased the
selectivity...
>
>
>
>
>Villy  VE6SQ

Sounds like my Heathkit Q Multiplier from 1967.  Remember those?



--
Bob Lombardi            WB4EHS in Melbourne, FL          o        \---\---\
[e-mail]    or   [e-mail]        /\            |
Telescope making, optics, astronomy, piano, bicycling  -\ 7   & radio |
I've run out of things I can say in 4 lines.         (*)/(*)          |



From [e-mail] Fri Jan 26 13:49:21 1996
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From: [e-mail] (James P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: varator diodes
Date: Tue, 23 Jan 1996 03:24:27 GMT
Organization: Duke University, Durham, NC, USA
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[e-mail] (progen et2) wrote:

>Does anyone have a source of varator diodes.
>I want to build tripler to 23cm, but cannot find definite source for
>varator diodes. (BAY66???) any info would be appreciated!
>Thanks in advance.

     This may sound crazy, but measurements with a network analyzer show
that green LEDs make excellent, high Q, varactors.  You should dip the
LEDs in black paint to prevent ambient light from getting to the junction
though.

     BTW, green LEDs are fabricated out of the same material that many
microwave transistors and diodes are, gallium arsinide.

        Jim




From [e-mail] Fri Jan 26 13:49:22 1996
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From: [e-mail] (progen et2)
Newsgroups: rec.radio.amateur.homebrew
Subject: varator diodes
Date: 22 Jan 96 11:49:07 GMT
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Does anyone have a source of varator diodes.
I want to build tripler to 23cm, but cannot find definite source for
varator diodes. (BAY66???) any info would be appreciated!
Thanks in advance.

Warren EI6ETB

[e-mail]



From [e-mail] Fri Jan 26 13:49:23 1996
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From: "James P. Meyer" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: varator diodes
Date: Tue, 23 Jan 1996 16:28:26 -0500
Organization: Duke University, Durham, NC, USA
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On Tue, 23 Jan 1996, Tom Bruhns wrote:

> :      This may sound crazy, but measurements with a network analyzer show
> : that green LEDs make excellent, high Q, varactors.  You should dip the
> : LEDs in black paint to prevent ambient light from getting to the junction
> : though.
>
> Well, you're sure right, it sounds a bit crazy!  Do you have more info on
> this?

        My boss spent all night measuring "real" varactors and every
other kind of diode he could find.  Results showed green LEDs with the
highest Q (lowest series R) of all.  Cap ranges around 10 to 5 pF and
useable to a reverse bias of 10 to 15 volts.

        I failed to make the connection between the varactor number given
and the requirement for any real power.  LEDs *would* be limited to the
milliwatt range.  We used them in VCOs and VCXOs.

> range, centered in the VHF and UHF ranges, and finding low capacitance
> varactors with good Q has been difficult.  But I also suspect the green
> LEDs will have large enough area that they won't be particularly low
> capacitance.

        Try one and see.  You may be as pleasantly surprised as I was.

Jim




From [e-mail] Fri Jan 26 13:49:24 1996
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From: [e-mail] (Dale Wentz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: varator diodes
Date: 25 Jan 1996 01:30:08 GMT
Organization: Me Myself And I
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In article <[e-mail]>,
[e-mail] says...
>
>Does anyone have a source of varator diodes.
>I want to build tripler to 23cm, but cannot find definite source for
>varator diodes. (BAY66???) any info would be appreciated!
>Thanks in advance.
>
>Warren EI6ETB
>
>[e-mail]
>
Try  Marlin P. Jones & Assoc. Inc. 1-800-652-6733
Thay have Matched Sets of 3  Varactors MV1662 Motorola
15VDC Max REv 400ma Nax forward I
Capacitance 225pf min 250pf Norm @ 4.0 Vr, Cap ratio=2.3@vr2-15VDC

The only Bad thing is that thay have a 15.00 Min order.

Hope this help
KB9JJA/Dale



From [e-mail] Fri Jan 26 13:49:25 1996
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From: [e-mail] (SMaas)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: varator diodes
Date: 25 Jan 1996 20:15:15 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <4e99v3$[e-mail]>
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NNTP-Posting-Host: newsbf02.mail.aol.com

In article <[e-mail]>,
[e-mail] says...
>
>Does anyone have a source of varator diodes.
>I want to build tripler to 23cm, but cannot find definite source for
>varator diodes. (BAY66???) any info would be appreciated!
>Thanks in advance.
>
>Warren EI6ETB

Why mess with varactors? They're a pain in the tush.  Hard to get them
working, and prone to weird oscillations. Build a bipolar tripler; lots of
good devices at 1 GHz.  Also, even better to start lower in frequency, if
possible, and use two doublers.

Steve
W5VHJ


From [e-mail] Fri Jan 26 13:49:26 1996
Path: news.epix.net!news.sprintlink.net!cc.iu.net!news
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: varator diodes
Date: 26 Jan 1996 00:57:41 GMT
Organization: Organized?  I can't even find my car keys
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References: <[e-mail]>
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Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

In article <[e-mail]>, [e-mail]-waterfo
rd.IE
says...
>
>Does anyone have a source of varator diodes.
>I want to build tripler to 23cm, but cannot find definite source for
>varator diodes. (BAY66???) any info would be appreciated!
>Thanks in advance.
>
>Warren EI6ETB
>
>[e-mail]
>

Don't have a source for those, but here's a thought for you.

A guy who is more clever than I am decided that all diodes have those
properties, and the only difference was that varactors were specially
doped to emphasize them.  So he made a "varactor" tripler out of some
1N914 diodes.  Worked fine, but I think he said they were a little
lossier.

That was about 12 or 15 years ago, and I think it was even a commercial
product, so it was repeatable.

The guy was WA4GHK.


73,
Bob


--
Bob Lombardi            WB4EHS in Melbourne, FL          o        \---\---\
[e-mail]    or   [e-mail]        /\            |
Telescope making, optics, astronomy, piano, bicycling  -\ 7   & radio |
I've run out of things I can say in 4 lines.         (*)/(*)          |



From [e-mail] Fri Jan 26 13:49:27 1996
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From: [e-mail] (James P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED:  72 ohm twinlead
Date: Tue, 23 Jan 1996 03:28:08 GMT
Organization: Duke University, Durham, NC, USA
Lines: 18
Message-ID: <[e-mail]>
References: <4dueps$[e-mail]>
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X-Newsreader: Forte Agent .99c/16.141

Gary Stone <[e-mail]> wrote:

>My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead
>for a balun on an antenna project.  I know very little of the project,
>but he does not have internet and I wanted to try and locate a source for
>him.

        For just 3 feet, he would be better off making the twinlead
himself out of copper or aluminum tubing.  The diameter and spacing should
be easy to calculate or adjust from measurements.

        In the olden days, that's the way *real* hams did everything.

        8-)

        Jim




From [e-mail] Fri Jan 26 13:49:27 1996
Path: news.epix.net!uunet!in2.uu.net!news.texoma.com!usenet
From: Gary Stone <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED:  72 ohm twinlead
Date: 21 Jan 1996 22:30:20 GMT
Organization: Internet Texoma, Inc.
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Greetings,

My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead
for a balun on an antenna project.  I know very little of the project,
but he does not have internet and I wanted to try and locate a source for
him.

Any ideas?  Please e-mail response if possible.

Thanks and 73,

Gary



--

       /\__/\        Gary and Karen Stone (Gary N5PHT)
        0  0         E-Mail:  [e-mail]
         @               or    [e-mail]
       (_/\_)        Http://home.texoma.com/personal/garystone/
         ~~




From [e-mail] Fri Jan 26 13:49:29 1996
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From: [e-mail] (Donald J. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED:  72 ohm twinlead
Date: 24 Jan 1996 06:16:42 -0800
Organization: CRL Network Services      [phone]  [Login: guest]
Lines: 28
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Jim Devenport ([e-mail]) wrote:

: 3 feet?  I could mail him some but the postage would exceed the
: value of the twinlead.  We have found 72 ohm twinlead to be
: fairly difficult to locate and when we finally did we bought a
: spool.  For short HF uses many varieties of common 2-wire AC
: "ZIP" cord closely approach 72-75 ohms impedance.  Perhaps that
: would work for his application.

Caution would need to be exercised if the application occurs at
full legal power.  If the design of the matching network is such that
standing waves occur in the transmission line during normal operation,
dielectric breakdown on the zipcord could occur.

My previous post concerning the realizability of 72 ohm twinlead
assummed an air dielectric.  Zip cord, of course has some type of
synthetic rubber or plastic with a dielectric constant greater than
air.

Later,



--
-------------------------------------------------
Don Miller
[e-mail]
-------------------------------------------------


From [e-mail] Fri Jan 26 13:49:30 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED: 72 ohm twinlead
Date: Tue, 23 Jan 1996 17:19:46 -0800
Organization: Call America Internet Services  [phone]
Lines: 25
Message-ID: <[e-mail]>
References: <4dueps$[e-mail]> <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Belden still makes this twinlead.  They also make 150 ohm material which
is also of use in baluns..73  Cliff Buttschardt  W6HDO

On Tue, 23 Jan 1996, James P. Meyer wrote:

> Gary Stone <[e-mail]> wrote:
>
> >My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead
> >for a balun on an antenna project.  I know very little of the project,
> >but he does not have internet and I wanted to try and locate a source for
> >him.
>
>       For just 3 feet, he would be better off making the twinlead
> himself out of copper or aluminum tubing.  The diameter and spacing should
> be easy to calculate or adjust from measurements.
>
>       In the olden days, that's the way *real* hams did everything.
>
>       8-)
>
>       Jim
>
>
>
>


From [e-mail] Fri Jan 26 13:49:31 1996
Path: news.epix.net!news.sprintlink.net!whidbey.!usenet
From: [e-mail] (DAVE M . SCHERTZER)
Newsgroups: rec.radio.amateur.homebrew
Subject: WD-40 vice Contact/Tuner Spray!!
Date: 25 Jan 1996 03:27:50 GMT
Organization: DND  CF DET Whidbey Is. WA
Lines: 8
Message-ID: <4e6tbm$[e-mail]>
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Use WD-40 on my mobile rig to fix a LCD prob and
it worked!!!! Tried contact/tuner spray and had to
re-apply every 2 weeks, WD-40 no probs fer the
last 6 months..works fine in a pinch.....

de ve7-lfa




From [e-mail] Fri Jan 26 13:49:32 1996
Path: news.epix.net!news.sprintlink.net!i-2000.com!usenet
From: [e-mail] (Prowler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Date: Fri, 26 Jan 1996 01:23:20 GMT
Organization: I-2000 Inc. - Internet Services
Lines: 28
Message-ID: <4e9a5d$[e-mail]>
References: <4e6tbm$[e-mail]>
NNTP-Posting-Host: dougrand.dh.i-2000.com
X-Newsreader: Forte Free Agent 1.0.82

WD-40 is great stuff.  I used to work building bridges and several
times my walkie talkie (ham) fell into the salt water.  My standard
procedure was to leave it where it fell, remembering where it was.  I
would go back after work with SCUBA, retrieve the radio and put it
into a bucket of water from the bay.  Then upon returning home, I
would dip the radio into alcohol and blow it out with air pressure.  I
did that several times until I was sure all the water I could get to
was displaced.  Then, I would spray it full of WD-40 and blow it out
again, doing this at least two times to get the WD-40 into all the
crevices.  I never damaged a radio and did this at least 4 times with
one unit.  Only the battery wire from the terminal to the battery
would burn out while it was under water.  I would take the radio to
work the next day.

Doug KN2Y

[e-mail] (DAVE M . SCHERTZER) wrote:

xxUse WD-40 on my mobile rig to fix a LCD prob and
xxit worked!!!! Tried contact/tuner spray and had to
xxre-apply every 2 weeks, WD-40 no probs fer the
xxlast 6 months..works fine in a pinch.....

xxde ve7-lfa
xx





From [e-mail] Fri Jan 26 13:49:33 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Winding torroids - wire gage?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4djt6j$32v$[e-mail]> <4dmuoa$[e-mail]>
Date: Sat, 20 Jan 1996 16:45:04 GMT
Lines: 41

In article <4dmuoa$[e-mail]> [e-mail](Tim Hynde
ka8ddz/qrp Rochester, MI ) writes:
>
>Im looking at building several QRP projects, they all call for
>different size wire on the torroids, usually #26,#28,#30 is there a
>formula for figureing out different gage wire substitutes?
>
>I dont mind buying a spool or two of the different sizes but if the
>spec calls for 30 turns of #28 on a T60-6 can you put more or less
>turns of #26 and get the same results. Why the different sizes?

For a *space* wound coil on a core, the size of the wire is determined
primarily by the amount of current it must handle. Thus for higher
currents, larger gage wire is chosen. (Note for RF it is skin effect
resistance that counts here.)

For a *close* wound coil on a core, it is the number of turns
that will *fit* on the core that determines gage. Obviously,
more turns of wire can be put on a given size core if the wire
is of smaller diameter. (Multilayer and scramble wound cores
are grossly different than the single layer type we're discussing
of course.)

If neither of these limits is a concern, then it is only the number
of turns (and the core material of course) that determines inductance,
not the wire gage. (There are, usually minor, factors beyond the number
of turns that determine final inductance. The spacing of turns affects
the turn to turn capacitance, so spreading or compressing turns on the
core has the effect of varying effective inductance. Different gages may
allow *room* for more or less of this spreading and compressing.)

Air core coils have different constraints having to do with length
to diameter ratios, flux leakage, and the like, which complicate
the picture. You can largely ignore these issues with toroids as
long as you use the specified core.

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


From [e-mail] Fri Jan 26 13:49:34 1996
Path: news.epix.net!news.sprintlink.net!news.netnet.net!en.com!in-news.erinet.com!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Winding torroids - wire gage?
Date: 19 Jan 1996 18:38:46 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 27
Message-ID: <4doofm$[e-mail]>
References: <4dmuoa$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Tim Hynde ka8ddz/qrp Rochester, MI ([e-mail]) wrote:

: Im looking at building several QRP projects, they all call for
: different size wire on the torroids, usually #26,#28,#30 is there a
: formula for figureing out different gage wire substitutes?

: I dont mind buying a spool or two of the different sizes but if the
: spec calls for 30 turns of #28 on a T60-6 can you put more or less
: turns of #26 and get the same results. Why the different sizes?

The wire size won't affect the inductance significantly.  Inductance
depends on the particular core, and in general, for a given core, the
inductance increases as the square of the number of turns:  double the
number of turns and the inductance multiplies by 4.  That's true for air-
core coils, too, if you wind the wire in the same space..same diameter and
length, but more turns (of smaller wire).  But for toroid cores, you
wouldn't want to try to put more turns through the center than will fit.
For RF work, general practice seems to be to keep it to a single layer, so
you'd want to go smaller in wire size if the original had things packed
tight around the core already.  If you get an information packet from
Amidon, it will probably have a table of number of turns of various wire
sizes versus core size.

In general, you want to use the largest wire you can for a given core and
winding geometry (i.e. single layer), to keep resistance low and Q high.
But in air-core coils at RF, it's usually important to space the turns apart
from eachother to keep distributed capacitance under control.


From [e-mail] Fri Jan 26 13:49:35 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!nntp.earthlink.net!usenet
From: [e-mail] (Todd Owen)
Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew
Subject: WTB & FS UHF Crystals
Date: Wed, 24 Jan 1996 01:34:51 GMT
Organization: Earthlink Network, Inc.
Lines: 21
Message-ID: <4e4254$[e-mail]>
NNTP-Posting-Host: pool021.max8.washington.dc.dynip.alter.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.swap:55723 rec.radio.amateur.homebrew:12870

I have transmit and receive crystals for the
following frequencies:
457.525, 457.550, 457.575, 457.600 MHz

I am looking for a transmit and receive crystal
for any frequency in a 440-450MHz simplex band such
as 445.000, 445.100, 445.150 MHz, etc....

I will trade all of the 457 MHz crystals for the
445MHz set.


--73, Todd KE4UDN

-----------------------------------------------------------------
Todd Owen       Hanover Engineers, P.C.
Richmond, VA    804-730-0011

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



From [e-mail] Fri Jan 26 13:49:36 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RickN76227)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB-Western Electric
Date: 24 Jan 1996 11:12:29 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <4e5lpd$[e-mail]>
Reply-To: [e-mail] (RickN76227)
NNTP-Posting-Host: newsbf02.mail.aol.com

I collect WE stuff.  I am interested in buying nearly anything made by or
for them. Please email me if you have anything to sell or trade.

Thanks


From [e-mail] Fri Jan 26 13:49:37 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Michael C. McHugh (TA2ZG/W2AV))
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Yaesu FIF-232C information and/or help
Date: 25 Jan 96 19:54:15 GMT
Organization: ucsd usenet gateway
Lines: 33
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Chester Mccarter <[e-mail]> wrote:

>I have a Yeasu FT747GX and am trying to find a diagram of the FIF-232c
>CAT cable. I'm sure that there is someone out there that has built a
>similiar type cable. Please reply via e-mail also.

Here is a circuit that we used at the local PRBBS for auto-QSY when we
had an FT-747GX.  Be warned:  it is *crude*.  It doesn't 'listen' to the
radio and it has no provision to avoid sending a command if the radio is
not 'ready'.  OTOH it worked, I was able to build it into the DB25 computer
connector, and it was dirt cheap.  If your application is something like
auto-QSY of a BBS for forwarding, give it a try.  If you need a full-
service CAT function, better stick with the FIF-232C or equivalent:

                                           47 j
           10 Kj                 |/ -----/\/\/\----- -------> FT-747GX
     >----/\/\/\------ --- ------|  Si NPN          |         CAT input
DB25-2                |   |      |\>--             ___        (+5v/680j)
 TXD                 ___ ___          |   .01 ufd  ___
                  Si  ^  ___ .01 ufd ___            |
                      |   |          ///            |
                      |   |                        ___
                     ___ ___                       ///
                     /// ///

The diode and transistor can be whatever you have in your junk box - not
critical.

Hope this helps - have fun and 73 -

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


From [e-mail] Tue Jan 30 16:25:18 1996
Path: news.epix.net!uunet!in1.uu.net!istar.net!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!Rezonet.net!altitude!Stratus.CAM.ORG!not-for-mail
From: [e-mail] (James Lyons)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ***ONE OF THE BEST HAM WEB PAGES ON THE INTERNET. TRY IT OUT!!***
Date: 22 Jan 1996 13:49:59 -0500
Organization: Communications Accessibles Montreal, Quebec Canada
Lines: 24
Message-ID: <4e0m8n$[e-mail]>
References: <4dk7io$[e-mail]> <4dlre7$[e-mail]>
In-Reply-To: <4dlre7$[e-mail]>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Xref: news.epix.net rec.radio.amateur.misc:97408 rec.radio.amateur.antenna:18711 rec.radio.amateur.digital.misc:13825 rec.radio.amateur.equipment:24270 rec.radio.amateur.homebrew:13004 rec.radio.amateur.policy:32834 rec.radio.amateur.space:6217



On 18 Jan 1996, Ken Durham wrote:

> In article <4dk7io$[e-mail]>, [e-mail] says...
> >
> >Hello all:
> >
> >      In the last message that I sent over usenet I forgot to include my
> >url for my web site. The URL is "http://www.dfw.net/~dmclean".
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
`
> I tried this URL yesterday and again this morning with no results. Netscsape
> keeps contacting the host forever. Please try your page from another site an
d
> see if it can be accessed.
>
> Ken Durham K5MBV  [e-mail]
>
>
>
I had no problem accessing it yesterday (Sunday) afternoon, twice ...
once via Netscape and once via Lynx.

Jim Lyons



From [e-mail] Tue Jan 30 16:25:19 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!csn!ub!news.kei.com!newsfeed.internetmci.com!in1.uu.net!noc.nyx.net!nyx10.cs.du.edu!not-for-mail
From: [e-mail] (larry kollar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Grapefruit powered XMTR?
Date: 23 Jan 1996 13:52:49 -0700
Organization: University of Denver, Dept. of Math & Comp. Sci.
Lines: 15
Message-ID: <4e3hr1$[e-mail]>
References: <[e-mail]> <4dj0qa$[e-mail]> <[e-mail]> <bayomi.822065511@access>
NNTP-Posting-Host: nyx10.nyx.net

Thus spake Don Bayomi:

>re: grapefruit powered Transmitter,   Did Gilligans Island know about it?

[...]

>I don't recall if there was an episode on Gilligans Island where the
>professor made a transmitter out of a fruit?

I think you're remembering their transistor radio that was usually
playing news reports... it was powered by a string of lemons.
--
Larry Kollar, Dawsonville GA  | *** Hatred is murder *** (1 Jn 3:15)
[e-mail]              | http://www.nyx.net/~lekollar/
                  "His third dimension done been re-VOKED!"


From [e-mail] Tue Jan 30 16:25:20 1996
Date: 23 Jan 1996 16:38:44 EDT
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!maggie.ionsys.com!newspeak.ultratech.net!worldlinx.com!clio.trends.ca!innuendo.tlug.org!telly!lethe!gts!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
Subject: MCX100 PROM programming ?
Lines: 24



I recently aquired a 16 channel Motorola MCX100 commercial VHF radio.
Wondering if anyone has any info on programming a PROM for it ?

This one has the "R2" VCO board...146 to 174 MHz.
I see by the schematic that it uses 6 nibbles (4 bits wide) for the
programming word. I also note that the PROM address is made up of
the channel selector inputs AND a few bits from the phase comparator/
PLL chip.  It appears that the Addressing from the phase detector/PLL
gets clocked out and the data read back...6 times (for the 24 bit word).

I'm wondering how the data relates to the desired frequencies and
where the data should be placed (what addresses) ?
Also wondering what the synthesizer step size is ?

The easier solution to all this is to have someone program a PROM
for me but thats too easy :)

Curious....Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]


From [e-mail] Tue Jan 30 16:25:21 1996
Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!news.itsnet.com!a_wallace1.dtint.com!allen
From: Allen Wallace <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST UHF Noise generator
Date: 23 Jan 1996 16:48:32 GMT
Organization: Digital Technology International
Lines: 40
Distribution: world
Message-ID: <4e33h0$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: gatekeeper0.wia.net
X-UserAgent: Version 1.1.3
X-XXMessage-ID: <AD2A59267101D034@a_wallace1.dtint.com>
X-XXDate: Tue, 23 Jan 96 16:21:42 GMT

In article <[e-mail]> Lawrence Stoskopf,
[e-mail] writes:
>>I'm too cheap to buy a NoiseCom diode, and I!d like to try a 1N21
>>microwave diode instead.
>
>Come on.  For all you have probably invested, what's a little bit more.
And
>besides, what other RF company can you call a probably have the company
>owner answer the phone....he did for me twice.
>

* some stuff cut here *
>
>>The final use for the noise source is to amplify the noise with 6 or so
>>MMIC amplifiers and use the noise with my spectrum analyzer to measure
>>filter response, etc, up to 2 GHZ. The noise hopefully should be flat
>>across the spectrum.
>
>How flat do you think that many MMICs will be?



Yes. I know I'm cheap and ought to use the NoiseCom diode, however I
haven't purchased one yet! I do have a few 1N21 diodes and I was
wondering the how they compare.

I figure I need to amplify a noise source of 20 ENR about 40-50 db to use
this as a broad-band signal source to use in lue of a tracking generator
for my  spectrum analyzer.

The Mini-Circuts MAR-4 (8 db gain) only drops 0.2 db from 100 Mhz to 1500
Mhz, and drops only another 0.3 do to 2000 Mhz. If I cascade 6 of these
babies, I'll get about 50 db of gain, however any more and I'll exceep
the 1db compression. This would give me a flat noise source with less
than 2 db of dropoff.

Maybe I'll try a MAV-11 MMIC as the final amplifer, as it has a 18 dbm
max power, but it is not very flat.

Has any one had any experience with this sort of thing?


From [e-mail] Tue Jan 30 16:25:22 1996
Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in2.uu.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: varator diodes
Date: Tue, 23 Jan 1996 22:38:57 GMT
Organization: RST Engineering
Lines: 24
Message-ID: <4e3o2q$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82


>>Does anyone have a source of varator diodes.

>     This may sound crazy, but measurements with a network analyzer show
>that green LEDs make excellent, high Q, varactors.

That's a great idea; I never even considered that possibility!!  You
wonder who thinks of this sort of thing, don't you?  Has anybody done
the same tests on the other colors?

Any good RF transistor has a good varactor in the reverse-biased
collector-base junction.  If you want a low-power varactor, pick a low
power transistor.  High power, use a power RF device.

Jim



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



From [e-mail] Tue Jan 30 16:25:23 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uchinews!ncar!gatech!newsfeed.internetmci.com!news.kei.com!ub!dsinc!netnews.upenn.edu!blue.seas.upenn.edu!depolo
From: [e-mail] (Jeff DePolo)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED:  72 ohm twinlead
Date: 24 Jan 1996 05:06:11 GMT
Organization: University of Pennsylvania
Lines: 54
Message-ID: <4e4eo3$[e-mail]>
NNTP-Posting-Host: blue.seas.upenn.edu


Donald J. Miller wrote:
>
> Gary Stone ([e-mail]) wrote:
>
> : My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead
> : for a balun on an antenna project.  I know very little of the project,
> : but he does not have internet and I wanted to try and locate a source for
> : him.
>
> You can't realize this transmission line with twinlead construction.
> For an impedance that low, the diameter of the conductors is greater
> than the spacing:
>
>      s = center to center spacing
>      d = wire diameter
>
>      Zo = 276 LOG(2s/d)

This is not always true.  72 ohm transmitting line is a common
item and is readily available from a number of sources.  Either
The Wireman, RF Connection, or Radio Works should have it.

The above equation applies only directly to air-insulated parallel conductors.
A non-air dielectric will lower the characteristic impedance, which is what yo
u
see with 72 ohm transmitting line, which uses something like 14 or 12 gauge
wire close-spaced in solid dielectric.

> You can still make a 72-ish ohm balanced transmission line, however,
> if you use a different type of construction:
>
>      Take four (4) sections of RG-59 (73 ohm coax) of equal length and
>      run them in parralell.  Solder all the shields together on both
>      ends.  Now, connect the center conductors together in pairs.
>      Cable A and B should have their center conductors connected
>      together on both ends, and cable C and D should have their
>      center conductors tied together.  You now have a 73 ohm
>      shielded *balanced* transmission line.  I will try to render it
>      in ascii:

Probably easier to take four sections of 300 ohm twinlead and connect
them in parallel.  Just keep them safely separated.

                                                        --- Jeff

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-
 Jeff DePolo  WN3A            Twisted Pair: H:610-337-7383  W:215-387-3059 x30
0
 [e-mail]  RF: 442.1 442.2 442.4 443.45 443.8 444.15 linked
 Claim to Fame: I got the first speeding ticket on the information superhighwa
y
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-
 Jeff DePolo  WN3A            Twisted Pair: H:610-337-7383  W:215-387-3059 x30
0
 [e-mail]  RF: 442.1 442.2 442.4 443.45 443.8 444.15 linked
 Claim to Fame: I got the first speeding ticket on the information superhighwa
y


From [e-mail] Tue Jan 30 16:25:25 1996
Path: news.epix.net!uunet!in1.uu.net!news.mailorder.com!news.avatar.com!avatar.avatar.com!kory
From: Kory Hamzeh <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Increasing the Power of the QST Antenna Tuner
Date: Wed, 24 Jan 1996 19:32:39 -0800
Organization: Avatar Consultants, Inc.
Lines: 28
Message-ID: <Pine.BSD/[e-mail]>
References: <Pine.BSD/[e-mail]> <[e-mail]>
NNTP-Posting-Host: avatar.avatar.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>
Xref: news.epix.net rec.radio.amateur.equipment:24183 rec.radio.amateur.homebrew:12971



On Sun, 14 Jan 1996, Gary Coffman wrote:

> In article <Pine.BSD/[e-mail]> Kor
y Hamzeh <[e-mail]> writes:
> >
> >I really liked the QST Antenna Tuner Project in the Jan 96 issue, but I
> >need a tuner that can handle up to 600 watts. Can some kind soul explain
> >to me what needs to be upgraded to handle 600 watts?
>
> The L network components, and the relays, need to be upgraded to handle
> the higher power. The circuit board probably won't work either, traces
> too thin and too close together, and the new parts probably won't fit
> either. A new relay driver circuit will likely be needed too. You can
> recalibrate the VSWR measuring circuit and use the custom microprocessor,
> but everything else needs to be replaced.
>
>
> Gary

Hi Gary,

The other problem I think I will defintly run into is all of the RF
energy getting to the microprocessor. I'm not quite sure how to isolate
it, other than shielding the microprocessor in a metal enclosure.

Kory



From [e-mail] Tue Jan 30 16:25:26 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!gatech!swrinde!sdd.hp.com!hplabs!unix.sri.com!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Toshiba S-AV17 amp module source
Date: 24 Jan 1996 23:17:11 GMT
Organization: Stanford Amateur Radio Club
Lines: 18
Message-ID: <4e6eln$[e-mail]>
References: <4e5qgn$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu
Keywords: Amp module source Toshiba

In article <4e5qgn$[e-mail]> [e-mail] (Elmar Vaher) writes:
>Cant seem to find this module anywhere. Digi-Key or Mouser does not have
>it.
>This is for building the 2M brick in the 1996 Handbook.
>Toshiba S-AV17 amp module.
>Any help in getting a source as well as hints on building the brick would
>be greatly appreciated.
>
>
>--
>       Elmar Vaher             ********--------**********
>       [e-mail]

Try RF PARTS.  I think they are still advertising in QST.

Steve Muther WF6R




From [e-mail] Tue Jan 30 16:25:26 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!psinntp!psinntp!psinntp!news1.h1.usa.pipeline.com!usenet
From: [e-mail](Jim Sheffield)
Newsgroups: rec.radio.amateur.homebrew
Subject: Opinions - Ramsey SX-20
Date: 24 Jan 1996 23:36:28 GMT
Organization: Jim Sheffield
Lines: 10
Message-ID: <4e6fps$[e-mail]>
NNTP-Posting-Host: pipe10.h1.usa.pipeline.com
X-Newsreader: Pipeline USA v3.2.0

I am contemplating diving into the kit-building
experience with the Ramsey SX-20 20-meter
SSB/CW transceiver.  Anyone built and/or
operated this rig?  I am especially interested
in the CW performance.  Opinions welcome by
posting or e-mail.

Thanks and 73,
Jim, KB7ET
[e-mail]


From [e-mail] Tue Jan 30 16:25:27 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!news.gate.net!bcfreenet.seflin.lib.fl.us!dcfreenet!d018667c
From: [e-mail] (Ricardo Buch)
Newsgroups: rec.radio.amateur.homebrew
Subject: Cuban-German Geneological Club
Date: 25 Jan 1996 00:14:51 GMT
Organization: SEFLIN Free-Net - Dade
Lines: 10
Message-ID: <4e6i1r$[e-mail]>
NNTP-Posting-Host: dcfreenet.seflin.lib.fl.us
X-Newsreader: TIN [version 1.2 PL2]

Old school Pc 4 sale;
I got an commodore 64 pc w/2 drives modem and printer. Was great for Packet.
Locals only. thanks :>


--

Ricardo Buch
[e-mail]



From [e-mail] Tue Jan 30 16:25:28 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!EU.net!Belgium.EU.net!ping.be!news
From: [e-mail] (Geert Pirens)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED schematic of a IF-100 interface!
Date: Thu, 25 Jan 1996 00:55:46 GMT
Organization: PING Belgium
Lines: 9
Message-ID: <4e6kcl$[e-mail]>
NNTP-Posting-Host: dialup37.hasselt.eunet.be
X-Newsreader: Forte Free Agent 1.0.82



Can someone help me on a schematic of an IF-100 interface ?

All information is welkom !

Geert Pirens,ONL2057




From [e-mail] Tue Jan 30 16:25:29 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.sprintlink.net!cc.iu.net!news
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO power supply noise reduction
Date: 25 Jan 1996 01:57:59 GMT
Organization: Organized?  I can't even find my car keys
Lines: 57
Message-ID: <4e6o37$[e-mail]>
References: <4ch6gf$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4d7ogd$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: netport-45.iu.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

In article <[e-mail]>, [e-mail] says...
>
snip out third party....
>
>My fears involve long term effects such as problems with moisture and plastic

>packaged ICs. This isn't exactly my area of expertise, however, in my
>department, we have materials people, chemists, and other components engineer
s
>that share my concern. I realize that some environments, particularly
>automotive, have conditions that may be worse than mil spec requirements.
>However, if you store your car for ten years in a bunker then ship it to Saud
i
>Arabia and store it for a while at 140 degrees F and then ship it to Alaska
>and store it there for a while then take it out and try to start it with
>the first turn of the key, what happens? You probably will have six sigma
>(latest buzz word) repeatability; it fails 999,997 times out of 1,000,000.

Automotive is bad, but offshore oil rigs may be the worst, according to
something I read.

>
>On a not too related subject, but one brought on by a not to well thought out

>edict:
>
>We have also been forced to eliminate the use of oxygen-depleting-chemicals
>(ODCs), such as the defluxing agents used to remove rosin flux. So, we use
>acid fluxes and water-based solvents. Of course, we are using surface mount
>components too. What are the long tern effects of less than perfect removal o
f
>the flux trapped under the components in moist environments. Your guess is as

>good as mine. But this is progress :-)

Personally, I think the obsession with removing rosin flux is cosmetic.  My
only measurement experience with this is from over 15 years ago when I was sti
ll
a technician.  Used to work for a place that made very precise measurement
equipment for computer control of all sorts of industrial stuff (everything
from making chocolate at Hershey's to reclaiming silver at Kodak).  The most
sophisticated amplifier card we had, with a gain of 2048 in a system that read
down to microvolts per bit, was sensitive to contamination.  Skin oils would
drive readings off, invalidate input bias current measurements, and other thin
gs.
Rosin flux was essentially inert.  I saw cards come back from the field with
flux on them for years and it was never a problem.

I would guess that an activated flux might be a problem, but I've never seen
studies on it, or had experience with it.

>
>>Airbag.  n.  1) An automotive accessory designed to explode on impact.
>
>ALL of our products are designed to explode on impact.


Too bad.  Unless you make stuff for the construction/excavation industry.

--
Bob Lombardi            WB4EHS in Melbourne, FL          o        \---\---\
[e-mail]    or   [e-mail]        /\            |
Telescope making, optics, astronomy, piano, bicycling  -\ 7   & radio |
I've run out of things I can say in 4 lines.         (*)/(*)          |



From [e-mail] Tue Jan 30 16:25:31 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!nntp-hub2.barrnet.net!news.Stanford.EDU!chemeng.Stanford.EDU!mike
From: [e-mail] (Mike Mackaplow)
Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: I found some old vacuum tubes ...
Date: 25 Jan 1996 04:48:55 GMT
Organization: Department of Chemical Engineering, Stanford University
Lines: 25
Distribution: inet
Message-ID: <4e723n$[e-mail]>
NNTP-Posting-Host: chemeng.stanford.edu
Keywords: vacuum tubes
Xref: news.epix.net sci.electronics.equipment:908 sci.electronics.components:1626 rec.radio.amateur.homebrew:12980 rec.radio.shortwave:69348

While helping clear my mom's garage, I found some
vacuum tubes:

        Magnavox 12BA6
        Magnavox 12BE6
        Magnavox 12AV6
        RCA Electron Tube 35C5
        Sentinel 12BE6
        TEN 12BE6
        General Electric MA?
        ?? 12BA6
        ?? 12AV6
        ?? 35 W4 (2)

Is there a simple way to tell if the tubes are good ?  How
would I find out if they have any value ?  How would one go about
or, more likely, donating them ?

Thanks,

Mike Mackaplow
[e-mail]

P.S.    - I am in the southern San Francisco Bay area



From [e-mail] Tue Jan 30 16:25:32 1996
Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!newsfeed.rice.edu!news.sesqui.net!compassnet.com!usenet
From: Spencer Petri <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: HV P..S. Diodes.
Date: 25 Jan 1996 06:13:32 GMT
Organization: Compass Net, Inc.
Lines: 6
Message-ID: <4e772c$[e-mail]>
NNTP-Posting-Host: dial42.e-tex.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

These diodes are great for that big amp supply. 20KV and I did a
test at 1.2 Amps for 6 hours, these babies can take it. $10 each
or build a bridge at 4 for $35 and $3 for priority mail.

73 de Pete WA5JCI EM-21



From [e-mail] Tue Jan 30 16:25:33 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!wmwap1.math.uni-wuppertal.de!usenet
From: Robert Schneider <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Lowfer help.
Date: Thu, 25 Jan 1996 12:25:04 +0100
Organization: University of Wuppertal
Lines: 4
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: wrds15.urz.uni-wuppertal.de
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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Try ftp://ftp.uni-wuppertal.de/pub/lowfer
--
Robert Schneider       0202/4392244
[e-mail]


From [e-mail] Tue Jan 30 16:25:33 1996
Path: news.epix.net!uunet!in1.uu.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need 10 meter conversion info for Cobra 148gtl
Date: 25 Jan 1996 13:22:51 GMT
Lines: 11
Message-ID: <4e807b$[e-mail]>
References: <4djt6j$32v$[e-mail]> <4dkf20$[e-mail]> <4doufc$[e-mail]> <[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

>
>i've seen the "kits," its $50 for a crystal.
>
>jeff

Like I said earlier, his prices are astronomical!
You can buy a crystal from JAN Crystals for $10,
do the conversion yourself, and save big buxx!

73 de KC5NG



From [e-mail] Tue Jan 30 16:25:34 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: *** CHECK OUT WHIZBANGS & GIZMOS ***
Date: 25 Jan 1996 13:42:39 GMT
Organization: Internet Direct, Inc.
Lines: 10
Message-ID: <4e81cf$[e-mail]>
NNTP-Posting-Host: s20.phxslip4.indirect.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Check our NEW Homepage at http://www.versacom.com/www/louburke

We sell circuits, PC Boards, Kits and Finished Products.
Currently available are:
     Touchtone Decoder
     Audio Power Amp (10 watts)
     Electronic Thermometer with Alarm Circuit
     Audio Distribution Amp




From [e-mail] Tue Jan 30 16:25:35 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!overload.lbl.gov!news.emf.net!gatech!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED:  72 ohm twinlead
Date: 25 Jan 1996 19:22:12 GMT
Organization: ELNEC/EZNEC Software
Lines: 36
Message-ID: <4e8l94$[e-mail]>
References: <4e377j$[e-mail]>
NNTP-Posting-Host: ip-pdx14-14.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

;   [e-mail] (Donald J. Miller) writes:
;  Gary Stone ([e-mail]) wrote:

;  : My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead
;  : for a balun on an antenna project.  I know very little of the project,
;  : but he does not have internet and I wanted to try and locate a source for

;  : him.

;  You can't realize this transmission line with twinlead construction.
;  For an impedance that low, the diameter of the conductors is greater
;  than the spacing:

;       s = center to center spacing
;       d = wire diameter

;       Zo = 276 LOG(2s/d)

The formula you quote is an approximation, which falls apart with close
spacing/large conductors, as you found. The correct formula is

    Zo = 120 cosh^-1 (s/d)

where cosh^-1 is arc hyperbolic cosine.

This is for air dielectric. The presence of other material between the
conductors will lower the impedance.

72 ohm twinlead used to be common stuff, in two sizes, "receiving" and
"transmitting". I've got a bit of the transmitting stuff in my junk box,
but it's too large and stiff for practical use in a balun. In this day
and age, I'd use twisted pair with thinnish insulation. Unless it's being
used at a frequency where 3 feet is an appreciable fraction of a wavelength,
the Zo of the line probably won't be very important.

Roy Lewallen, W7EL



From [e-mail] Tue Jan 30 16:25:36 1996
Date: 25 Jan 1996 21:37:06 EDT
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!istar.net!infoshare!whome!gts!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
References: <4e5qgn$[e-mail]>
Subject: Re: Need Toshiba S-AV17 amp module source
Lines: 20


> Cant seem to find this module anywhere. Digi-Key or Mouser does not have
> it.
> This is for building the 2M brick in the 1996 Handbook.
> Toshiba S-AV17 amp module.
> Any help in getting a source as well as hints on building the brick would
> be greatly appreciated.
> --
>       Elmar Vaher             ********--------**********
>       [e-mail]


RF Parts in California sells these modules.
Look em up in a recent 73, CQ or QST ad.

Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]


From [e-mail] Tue Jan 30 16:25:38 1996
Date: 25 Jan 1996 21:37:14 EDT
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!hookup!noc.tor.hookup.net!ve3ied!gts!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
References: <4e02li$[e-mail]>
Subject: Re: QST Antenna Tuner Kit-First Impressions
Lines: 60


> In article <4csf5c$[e-mail]>, [e-mail] says...
> >
> >In article <1996Jan6.185503.8669@ohstpy>,
> >[e-mail] (JIM GARLAND) writes:
> >
> >>My only quibble with the kit is the printed circuit board. The board
> >>itself is of high quality. It is double-sided, with thru-plated holes,
> >>green solder-masking, and silk-screened component outlines shown in
> >>white. My concern about the board is that the large majority of the
> >>traces seem to be extremely thin. I couldn't measure them, but I'd
> >>guess a maximum width of 10 mil, and probably less, perhaps even
> >>6-7 mil. (all the relay control lines are wired this way.)  Further,
> >>the pad sizes seem too small relative to the holes in the pad. I'm not
> >>an expert at PCB layout, but I'd think that a pad should have a minimum
> >>of 10-15mil of metal around each hole.
> >>The majority of holes on the board have significantly less metal than
> >this. In fact, a majority of the holes were drilled slightly off-center
> >>in the pads, so that there is no metal at all on one side of the hole!
> >>

> >
> >Hi Jim, This sounds like the boards I get from out of house layout shops
> >that never work with RF. That's too bad. Maybe you could point that out to
> >the kit supplier, because your observations illustrate a big problem.
> >Somewhere I heard the rhyme short and thick does the trick. I assume that
> >meant RF traces.
> >
> >73 Tom

>
> I hope I am happy when mine arrives. As for the short and thick, that depend
s
> on the signal in RF. Some microwave circuits depend on "controlled" length a
n
> thickness, though better called width here, since thick is the depth of the
> copper clad. In my designs (I design electronics for a few paying customers)
,
> width is important in power supply to reduce I-R losses, as well as some key

> analog traces.
>
> I will post as soon as I finish building my tuner to let others know what I
> think of it.
>
> Douglas L. Datwyler   WR7O
> [e-mail]
>


The mentioned "thin" traces on the board are for logic control and
not RF (a typical width for digital circuitry). The RF lines, you will
note are much thicker.
My concern was that a groundplane was not utilized, instead...the
unused copper was etched away.  I would have kept the copper on any
unused areas on either side of the board with lots of plated thru holes
to help shield the digital control lines from the RF.

Regards...Hugh Duff  VA3TO  Toronto



---
 ■ NFX v1.3 [000]


From [e-mail] Tue Jan 30 16:25:39 1996
Date: 25 Jan 1996 21:37:22 EDT
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!istar.net!infoshare!whome!gts!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
References: <4dvntf$[e-mail]>
Subject: Re: Toroid permeability ???
Lines: 25


> >....but some surplus stores in Toronto have a wide
> >assortment of bins of unmarked toroids. It would be a nice
> >cost-effective altenative to having to order new ones if we knew what we
> >had sitting at our doorstep.
>
> May be I am wrong, But I expect that 99% of surplus toroids
> are intended for frequencies below 1 MHz (switch mode PSU's?)
>
> 73, Moritz DL5UH
>

I suspect that most of them are ferrite cores for noise suppression
use however there are several bins at the surplus store with
wound cores that look more like RF transformers.
Nevertheless, I get the feeling that it is not worth the effort
to try and salvage a small assortment of RF capable iron cores.
Just a passing thought though !

Regards...  Hugh Duff  VA3TO  Toronto



---
 ■ NFX v1.3 [000]


From [e-mail] Tue Jan 30 16:25:40 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!lynx.unm.edu!bubba.NMSU.Edu!not-for-mail
From: [e-mail] (beard)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Antenna Design Program
Date: 25 Jan 1996 22:10:23 GMT
Organization: New Mexico State University
Lines: 10
Message-ID: <4e8v4f$[e-mail]>
NNTP-Posting-Host: acca.nmsu.edu
X-Newsreader: TIN [UNIX 1.3 950621BETA PL0]

I know of one antenna modeling program called "YagiMatch"
Are there others out here?
If there are how to I get the freeware or shareware versions?

Thanks for any help you can give me.

WA4QGA
David Beard
El Paso, Texas



From [e-mail] Tue Jan 30 16:25:41 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!hookup!tank.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.join.ad.jp!wnoc-tyo-news!sinfony-news!sonygw2!oskgw!news
From: Peter Shintani <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help With MOV's
Date: 26 Jan 1996 05:48:37 GMT
Organization: Sony Japan
Lines: 10
Message-ID: <4e9pvl$[e-mail]>
References: <4d5d0k$[e-mail]> <4d7lvt$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 43.2.3.17
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-2022-jp
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-URL: news:[e-mail]

Hi:
        A company called Mitsubishi Material makes an awesome surge protector.
It's fast and once it's clamping voltage is exceede it's holding
voltage drops to nearly zero. This may provide better protection than a MOV
for a radio's input and also for phone lines, and modems. The device incidenta
lly
has less than 1 pF of capacitance so it's easier to use than a MOV. It can tak
e
repeated hits and it's characteristics stay constant were as MOV can deteriora
te.
PS




From [e-mail] Tue Jan 30 16:25:42 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!ns1.aplatform.com!pagesat.net!netserv.com!aimnet.com!news.ossi.com!agate!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!airwaves!rrb
From: [e-mail] (Ty Stober)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.broadcasting,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: Larsen Antennas Job Posting
Followup-To: poster
Date: 26 Jan 1996 07:35:11 GMT
Organization: Pacifier Internet Server [phone]
Lines: 38
Approved: [e-mail]
Distribution: world
Message-ID: <4ea07f$[e-mail]>
Reply-To: [e-mail]
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Originator: [e-mail]
Xref: news.epix.net rec.radio.amateur.antenna:18725 rec.radio.amateur.digital.misc:13837 rec.radio.amateur.equipment:24298 rec.radio.amateur.homebrew:13018 rec.radio.amateur.misc:97443 rec.radio.amateur.policy:32853 rec.radio.amateur.space:6220 rec.radio.broadcasting:20257 rec.radio.cb:25972 rec.radio.noncomm:5126 rec.radio.scanner:44621 rec.radio.shortwave:69433 rec.radio.swap:56275


MARKET MANAGER - ANTENNA PRODUCTS

Larsen Electronics is an internationally recognized supplier of quality
antenna products for two-way communications.  We are seeking an
experienced Market/Product Manager for Amateur and Commercial antennas.

Successful candidates will have in-depth experience in radio related
products up to 800 MHz. Direct experience with LMR and Amateur markets is
preferred.  Bachelor92s degree in Business or Marketing, or extensive
related business experience required. Position responsibilities include:
Product line management, pricing, sales programs, new products, training,
and technical support. This position will also include a competitive
compensation, incentive, and benefits plan.

Interested candidates may respond by forwarding a resume92 including
income history to:


Larsen Electronics, Inc.
ATT:  Human Resources Manager
P.O. Box 1799
Vancouver, WA. 98668-1799
FAX:  [phone]

Pre-employment drug screen required.  Larsen Electronics is an Equal
Opportunity Employer.

--
-------------------------------------------------------------------------
-
----
Pacifier Online Data Service Dialup SLIP/PPP User
To register: [phone] or telnet pods.pacifier.com
-------------------------------------------------------------------------
-
----



From [e-mail] Tue Jan 30 16:25:44 1996
Path: news.epix.net!news.sprintlink.net!news.netrail.net!imci2!news.internetMCI.com!darwin.sura.net!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: Swan XTAL Filter Impedance ?
Date: 26 Jan 1996 08:44:34 -0500
Organization: Harris Controls Division
Lines: 10
Message-ID: <4eals2$[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]

I found an old Swan xtal filter the other day. I'd like to play around
with it in a receiver circuit. It is a 487-024  freq = 9001.65 khz. I
think I came from an old Swan Astro 100 transceiver. What is the in/out
impedance ? Guess I could play until I got it matched if all else fails.

Doug, N4IJ
--
Doug  Snowden
[e-mail]



From [e-mail] Tue Jan 30 16:25:45 1996
Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DavidE70)
Newsgroups: rec.radio.amateur.homebrew
Subject: Kit HF receivers
Date: 26 Jan 1996 13:54:47 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <4eb81n$[e-mail]>
Reply-To: [e-mail] (DavidE70)
NNTP-Posting-Host: newsbf02.mail.aol.com

Do any manufacturers still make "low-tech" SW receivers or kits? I've seen
one that MFJ sells (a regenerative set) -- does anyone know if it actually
works? It claims CW and SSB as well as AM. Should I believe that? If it
performs up to its claims it would be perfect for my purposes. Any
suggestions for me? Thanks.

Dave Ek


From [e-mail] Tue Jan 30 16:25:46 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!reeve.research.aa.wl.com!decwrl!sunsite.doc.ic.ac.uk!demon!ifwtech.demon.co.uk!G3SEK
From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Balum Loss Question
Date: Fri, 26 Jan 1996 14:03:58 +0000
Organization: IFW Technical Services
Lines: 30
Distribution: world
Message-ID: <[e-mail]>
References: <4e98au$[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
X-NNTP-Posting-Host: ifwtech.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL>

In article <4e98au$[e-mail]>, Larry Lewis wrote:
>What is the loss (in db) of a 4:1 coax (assume 9913) balum at 144 mhz?
>or
>Where can I find the data (didn't see it in 1993 ARRL Handbook nor the
>RSGB VHF/UHF handbook)?
>or
>How to calculate the loss.
>or
>What is your guess?  My guess  is 0.2db???
>

0.2dB is commonly used in EME and other path loss budgets for a balun
made of low-loss cable.

As well as dissipative losses in the half-wavelength of cable, this
figure is usually taken to include losses due to phase errors and
radiation losses in connecting to the folded dipole. In other words it
is not directly measurable by methods such as connecting two identical
baluns back-to-back.

I guess it's really just a "wet-finger" allowance that people make when
converting from computed gain to real-world gain.



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


From [e-mail] Tue Jan 30 16:25:46 1996
Path: news.epix.net!news.sprintlink.net!usit.net!news
From: [e-mail] (Steven Fritts)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need info on RG 62
Date: Fri, 26 Jan 1996 14:31:24 GMT
Organization: United States Internet, Inc.
Lines: 8
Message-ID: <4eaopo$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bway-slip71.dynamic.usit.net
X-Newsreader: Forte Free Agent 1.0.82



Could someone tell me what the impedence of RG62 is?

Thanks,

Steve



From [e-mail] Tue Jan 30 16:25:47 1996
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From: [e-mail] (Jack Yazel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need info on RG 62
Date: 26 Jan 1996 14:40:12 -0500
Organization: The Greater Columbus FreeNet
Lines: 12
Message-ID: <4ebams$[e-mail]>
References: <4eaopo$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
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Steven Fritts ([e-mail]) wrote:


: Could someone tell me what the impedence of RG62 is?

: Thanks,

: Steve


    93 ohms



From [e-mail] Tue Jan 30 16:25:48 1996
Newsgroups: sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!hookup!news.mathworks.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.bhp.com.au!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!seurat.syd.dit.csiro.au!not-for-mail
From: [e-mail] (Ken Yap)
Subject: Re: I found some old vacuum tubes ...
X-Nntp-Posting-Host: seurat.syd.dit.csiro.au
Message-ID: <[e-mail]>
X-Face:  bak'McMAD{%JrA$mQ(j_Ex_o?a/F8/Nt<W\sbPkh?,)PF7TK1{Lh"HJLuQfhE}(Dj!g:c(U  =wh/r[<MJUF}hXzR*URO0e/Lh'mn_YUpU+;ycf6:0>ng*t2KX(NcfGalVs^Ke^C61:F
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|While helping clear my mom's garage, I found some
|vacuum tubes:
|
|        Magnavox 12BA6
|        Magnavox 12BE6
|        Magnavox 12AV6
|        RCA Electron Tube 35C5
|        Sentinel 12BE6
|        TEN 12BE6
|        General Electric MA?
|        ?? 12BA6
|        ?? 12AV6
|        ?? 35 W4 (2)
|
|Is there a simple way to tell if the tubes are good ?  How
|would I find out if they have any value ?  How would one go about
|or, more likely, donating them ?

Hah, you probably have some tubes from those AC/DC line transformerless
radios. The 35C5 is a power pentode or tetrode. The 35W4 is a
rectifier.  The 12BE6 is a converter. The 12AV6 is a dual triode.
If I remember correctly the filament current is 0.15A. They were usually
wired in series to make up 100-120V worth of voltage drop which is
just right for US power standard.

Just give them to a tube enthusiast. He/she will know what to do with
them.

Bothers me that I actually can remember this stuff. :-)


From [e-mail] Tue Jan 30 16:25:50 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news1!ind-008-237-85
From: [e-mail] (Patrick Croft)
Subject: Re: RG63/B COAX - OHMS=?
X-Nntp-Posting-Host: ind-008-237-85.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
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References: <[e-mail]> <[e-mail]>
Date: Fri, 26 Jan 1996 16:11:39 GMT
Lines: 17

"John R. Moore" <[e-mail]> wrote:
>Patrick Croft wrote:
>>
>> Seeking a little help on tech spec's of this stuff.  Have checked all handb
ooks,
>>  major manufacturer's catalogs  back thru the 60's, can't find it!  This is
 TIMES brand,
>> but not in their catalog either.  If you can shed some light I'd really app
reciate it!
>>
>> 73
>> Patrick  WB9IQIPatrick
>according to my book RG-63B impedance is 125 ohms Capacitance is
>10 pf/ft 6.4 db loss per 100 ft at 1000 mhz.
>John W5HUQ


Thanks to all for the info - many responded.  Very informed group we have here
!

73   PAtrick  WB9IQI


From [e-mail] Tue Jan 30 16:25:51 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NiCAD Charger Schematic?
Date: 26 Jan 1996 17:04:34 GMT
Organization: Dover Research Corp.
Lines: 5
Message-ID: <4eb1j2$sa7$[e-mail]>

There is also a schematic and PCB of WB0VGEs Nicad charger in CIRCAD format.
If you have Compuserve access GO HAMNET.  I think it is in lib 6 (or else 22)
the Homebrew area.
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Tue Jan 30 16:25:52 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!buphy.bu.edu!eburton
From: [e-mail] (Erich Burton)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: Adding lighting to Red Lion Controls counter modules
Date: 26 Jan 1996 18:41:51 GMT
Organization: Boston University Physics Department
Lines: 18
Message-ID: <4eb79f$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: buphy.bu.edu
Xref: news.epix.net sci.electronics.components:1590 rec.radio.amateur.homebrew:12954

[e-mail] (Doug Faunt N6TQS [phone]) writes:

:Does anyone have an address or other contact information for Red Lion
:Controls?

From the '95 eem guide:

Red Lion Controls
20 Willow Springs Cir.
York, PA  17402

Tel: [phone]
Fax: [phone]

Hope this helps.
____________________________________
Erich Burton  3-2602  [e-mail]
Boston University Physics Department


From [e-mail] Tue Jan 30 16:25:53 1996
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!news.paonline.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Reselling the home brew equipment
Date: Fri, 26 Jan 1996 20:54:42 GMT
Organization: Pennsylvania Online [Usenet News Server for Hire]
Lines: 30
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John Wilcox/NS1Z <[e-mail]> wrote:

>Was talking with my buddy this evening on the subject of buying and
>selling home brew gear. It was my opinion that home brew gear took such a
>beating at the sales table/tailgate due to the fact that most hams
>believe that no other ham has any construction skills and therefore, any
>equipment built by Mr. No Skill is worthless, except for the parts (which
>may or may not be any good!). Is this the way it is in your area of the
>world? What would make a piece of HB gear more valuable to the astute
>buyer?

Hi John....the very best way for homebrew gear to attain
value, is 1.  quality construction,  2. quality outward
appearance,  3.  documentation,  4. good salesmanship.

As far as the average ham not being competent to
build...that can be debated.  Many hams are all thumbs, many
are competent kit builders, lots are great from scratch but
the final product looks awful (works great though).  Then
there is that few that can take a box of junk, build the
best looking, functional and loaded with bells and whistles
piece of equipment.  So if you want a good piece of homebrew
equipment, learn the principles behind the box, and either
build it yourself or look deep into the construction of your
potential purchase.

73 de KC4WQ

BTW my stuff works but looks like @#$%



From [e-mail] Tue Jan 30 16:25:54 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.connectnet.com!usenet
From: David Negaard <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for plans for transceiver for packet
Date: Fri, 26 Jan 1996 21:17:34 -0800
Organization: Connectnet
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: forge.connectnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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I'm looking for plans for a simple (probably crystal-controlled)
transceiver that would be suitable for 9600 bps packet use.  Does anyone
know where I might obtain same?

My hand-held won't cut it, of course (PM instead of true FM), and I
can't really afford to buy another radio right now.

Also, I assume that a radio suitable for 9600 bps would also function
admirably at 1200?
--
San Diego District Youth Leader
David Negaard                                    phone: [phone]
625 Shenandoah Avenue                    mailto:[e-mail]
San Marcos, CA  92069          http://www3.graceland.edu/~jrmj/negaard


From [e-mail] Tue Jan 30 16:25:55 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!visi.com!news3.mr.net!mr.net!imci2!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Robert M. Miller )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: League publishes yet another mpu article sans software
Date: 26 Jan 1996 21:29:07 GMT
Organization: Netcom
Lines: 14
Message-ID: <4ebh33$[e-mail]>
NNTP-Posting-Host: sac-ca8-13.ix.netcom.com
X-NETCOM-Date: Fri Jan 26  1:29:07 PM PST 1996

Well unless my eyes have failed me, my December QEX just arrived
complete with a feature article on a mpu based receiver controller that
is cute and usable, but like the antenna tuner article this article
does not offer any vehicle to obtain source code--but the author's
company is willing to sell a kit; a kit which looks to be reasonably
price, but a commercial product none the less.  This again brings up
the question of article vs. review.  Perhaps a few letters to our
elected Division Directors would bring this to the attention of League
officials--

73
Bob, KE6F




From [e-mail] Tue Jan 30 16:25:56 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr6ip5.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components
Subject: Re: Need VCO, 1-2 gHz - circuit or off-shelf
Date: Fri, 26 Jan 1996 21:36:14 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 28
Message-ID: <[e-mail]>
References: <4ebi51$[e-mail]>
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Xref: news.epix.net aus.electronics:1625 aus.radio.amateur.misc:399 rec.radio.amateur.homebrew:12942 sci.electronics.components:1576

In article <4ebi51$[e-mail]> [e-mail] (Steve
Andrew) writes:
>From: [e-mail] (Steve Andrew)
>Subject: Need VCO, 1-2 gHz - circuit or off-shelf
>Date: Fri, 26 Jan 1996 21:42:58 GMT

>Hi
>I'm trying to obtain a VCO covering 1 - 2 gHz for use in a
>spectrum analyser project. I know Minicircuits (USA)
>manufacture a range of VCO modules but I am told that they
>are un-available in Australia due to future production being
>sold out.

I doubt they're sold out, but my catalog shows their highest frequency model
to be the POS-1025 which tunes from ~615 to 1050 MHz.

>If you know of an outlet for these units, or any other
>types, or have a proven circuit, please let me know.

There are other USA vendors, such as HP/Avantek and VariL, however, if you
only want one or two pieces, forget them.

>Many thanks in advance... Steve

Wes -- N7WS






From [e-mail] Tue Jan 30 16:25:57 1996
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!harbinger.cc.monash.edu.au!news.mel.aone.net.au!OzEmail!usenet
From: [e-mail] (Steve Andrew)
Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components
Subject: Need VCO, 1-2 gHz - circuit or off-shelf
Date: Fri, 26 Jan 1996 21:42:58 GMT
Organization: OzEmail Pty Ltd - Australia
Lines: 14
Message-ID: <4ebi51$[e-mail]>
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Xref: news.epix.net aus.electronics:1634 aus.radio.amateur.misc:400 rec.radio.amateur.homebrew:12955 sci.electronics.components:1592

Hi
I'm trying to obtain a VCO covering 1 - 2 gHz for use in a
spectrum analyser project. I know Minicircuits (USA)
manufacture a range of VCO modules but I am told that they
are un-available in Australia due to future production being
sold out.

If you know of an outlet for these units, or any other
types, or have a proven circuit, please let me know.

Many thanks in advance... Steve





From [e-mail] Tue Jan 30 16:25:58 1996
Path: news.epix.net!news.sprintlink.net!news.rain.org!usenet
From: [e-mail] (Allen)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.swap
Subject: WTB-QRP equipment
Date: Sat, 27 Jan 1996 04:52:41 GMT
Organization: RAIN Public Access Internet (805) 967-RAIN
Lines: 6
Message-ID: <4ecb70$[e-mail]>
NNTP-Posting-Host: @user01.term1.ventura.rain.org
X-Newsreader: Forte Agent .99.82
Xref: news.epix.net rec.radio.amateur.homebrew:12948 rec.radio.amateur.equipment:24136 rec.radio.swap:55990

Looking for some qrp equipment in any condition
name a price for what you got...
also looking for el cheapo straight keys for the
group to use..donations also gratefully
accepted..tnx  73  [e-mail]



From [e-mail] Tue Jan 30 16:25:59 1996
Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!news.net99.net!news.monmouth.com!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Date: 27 Jan 1996 06:52:15 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
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References: <4e9a5d$[e-mail]>
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In article <4e9a5d$[e-mail]>, [e-mail] (Prowler) writes:

>Then upon returning home, I
>would dip the radio into alcohol and blow it out with air pressure.

I do that with my egg sandwichs. My wife objects to the smell though. I
never tried it with a radio.


From [e-mail] Tue Jan 30 16:26:00 1996
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom12!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: Adding lighting to Red Lion Controls counter modules
In-Reply-To: [e-mail]'s message of 26 Jan 1996 18:41:51 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]>
        <[e-mail]> <4eb79f$[e-mail]>
Date: Sat, 27 Jan 1996 08:15:05 GMT
Lines: 5
Xref: news.epix.net sci.electronics.components:1605 rec.radio.amateur.homebrew:12965

It helped, a lot.  They make a counter module that's got a larger display, and
is backlit, in red or yellow/green.
I'm going to use one to keep track of the setting of a DK3 mobile
antenna.
73, doug


From [e-mail] Tue Jan 30 16:26:01 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: League publishes yet another mpu article sans software
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ebh33$[e-mail]>
Date: Sat, 27 Jan 1996 13:57:07 GMT
Lines: 32

In article <4ebh33$[e-mail]> [e-mail](Robert M.
 Miller ) writes:
>Well unless my eyes have failed me, my December QEX just arrived
>complete with a feature article on a mpu based receiver controller that
>is cute and usable, but like the antenna tuner article this article
>does not offer any vehicle to obtain source code--but the author's
>company is willing to sell a kit; a kit which looks to be reasonably
>price, but a commercial product none the less.  This again brings up
>the question of article vs. review.  Perhaps a few letters to our
>elected Division Directors would bring this to the attention of League
>officials--

You think that's bad, look at the Feb 96 QST. There's a "feature"
article that's nothing but an advertisement for the 96 Handbook.
And one of the columns answers reader questions with instructions
for ordering this League publication or that League publication
rather than just giving a straight forward answer to the question.
It appears that the feature and columnist pages of "the catalog"
have now been co-opted to advertise League wares as well as the
color ad section in the back.

I don't know about you, but I find this distressing. I expect
ads in QST, I expect ads for ARRL products in QST, but I don't
expect the editorial content to be turned into nothing more than
advertisements. I think it has become time to take a hard look
at ARRL publication editorial policy.

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


From [e-mail] Tue Jan 30 16:26:02 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DCimp)
Newsgroups: rec.radio.amateur.homebrew
Subject: Syntor Manual
Date: 27 Jan 1996 14:43:23 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <4edv8r$[e-mail]>
Reply-To: [e-mail] (DCimp)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am In need of a Syntor Manual, Not the X or the X9000 version, just the
Plain old Syntor.  I need one soon, anybody got one for sale?
[e-mail]


From [e-mail] Tue Jan 30 16:26:03 1996
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Michael A. Wyatt )
Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components
Subject: Re: Need VCO, 1-2 gHz - circuit or off-shelf
Date: 27 Jan 1996 15:13:04 GMT
Organization: Netcom
Lines: 24
Message-ID: <4edfe0$[e-mail]>
References: <4ebi51$[e-mail]>
NNTP-Posting-Host: ix-stp-fl3-12.ix.netcom.com
X-NETCOM-Date: Sat Jan 27  7:13:04 AM PST 1996
Xref: news.epix.net aus.electronics:1642 aus.radio.amateur.misc:404 rec.radio.amateur.homebrew:12969 sci.electronics.components:1614

In <4ebi51$[e-mail]> [e-mail] (Steve
Andrew) writes:
>
>Hi
>I'm trying to obtain a VCO covering 1 - 2 gHz for use in a
>spectrum analyser project. I know Minicircuits (USA)
>manufacture a range of VCO modules but I am told that they
>are un-available in Australia due to future production being
>sold out.
>
>If you know of an outlet for these units, or any other
>types, or have a proven circuit, please let me know.
>
>Many thanks in advance... Steve
>
>
>
Steve,

    You might try Avantek or Z-Comm in the US.

    Hope this helps,

    Mike Wyatt


From [e-mail] Tue Jan 30 16:26:04 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!info.ucla.edu!agate!holonet!colossus.holonet.net!minfox!tom.alldread
From: [e-mail] (Tom Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: Duplexer to Bandpass Filter
Date: Sat, 27 Jan 1996 15:26:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
References: <[e-mail]>
Lines: 22


V>I have a 3 cavity mobile VHF duplexer that I would like to re-configure
 >as a 2m bandpass filter.  Is this possible?  How would I go about it?

Hi John:

        You have made curious. I wonder what a 3 cavity mobile duplexer
is used for?

         If the cavities are full size band pass/ band reject type
you could possibly utilized one ~as is~ for a front end band pass filter
but it probably will limit your operational band coverage on 2 meters.
You would also need to make sure the band reject notch is tuned well
away from the band segment of interest.

        BTW Sinclabs had a 2 meter two cavity bandpass filter designed
for mobile operation available a couple of years ago.

73 de VE7TMA

---
 * QMPro 1.53 * Very Best Regards, [e-mail]


From [e-mail] Tue Jan 30 16:26:06 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet
From: [e-mail] (Kenneth Burtchaell)
Newsgroups: rec.radio.amateur.homebrew
Subject: PCB artwork transfer
Date: 27 Jan 1996 15:38:04 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 8
Distribution: world
Message-ID: <4edgss$[e-mail]>
NNTP-Posting-Host: inugap3.news.prodigy.com
X-Newsreader: Version 1.2

I am looking for successful ways to transfer printed artwork to board for
etch resist.I seem to have a lot of difficulty cleaning paper off the
board after transfer without damaging traces.I can use transparencies
with no problems but paper backed images is another story.Is there
someother paper besides   ordinary printer paper that  can be used?

            73 Ken Burtchaell W6GHV



From [e-mail] Tue Jan 30 16:26:07 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!cis.ksu.edu!mac
From: [e-mail] (Myron A. Calhoun)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Grapefruit powered XMTR?
Date: 27 Jan 96 17:48:02 GMT
Organization: Kansas State University
Lines: 19
Message-ID: <[e-mail]>
References: <bayomi.822065511@access> <[e-mail]> <4di8v6$ <[e-mail]>
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X-Newsreader: NN version 6.5.0 #6 (NOV)

[e-mail] (Clinton Peebles) writes:
>B>re: grapefruit powered Transmitter,   Did Gilligans Island know about it?

>Didn't the professor make a battery charger out of coconuts on one
>episode? They had to stir their coconuts.

For a senior EE lab project many, many years ago, I powered a small
receiver from what I called a "primary" cell, or "P-cell" for short.'

Yes, the electrolyte was pee (urine, for the highly-educated).   :-)

Got an "A" on the Project, too!

--Myron.
--
# Five boxes preserve our freedoms:  soap, ballot, witness, jury, and cartridg
e
# Myron A. Calhoun, PhD EE; Assoc. Prof.     [phone] work, 532-7353 fax
# Amateur packet radio: W0PBV@N0ARY.#NOCAL.CA.USA.NOAM            539-4448 hom
e
# NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol
)


From [e-mail] Tue Jan 30 16:26:08 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NiCAD Charger Schematic?
Date: 27 Jan 1996 17:50:37 GMT
Organization: Dover Research Corp.
Lines: 6
Message-ID: <4edold$d4q$[e-mail]>

I should really get the growing batch of Circad schematics and Pcb files and
put them someplace!  There is the mobius.gmu.edu site that has the old demo
but I'm not clear on what else can be plunked in that area.  Any suggestions
on a site everyone can use?
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Tue Jan 30 16:26:09 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!cis.ksu.edu!mac
From: [e-mail] (Myron A. Calhoun)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Antenna Tuner Kit-First Impressions
Date: 27 Jan 96 17:52:11 GMT
Organization: Kansas State University
Lines: 18
Message-ID: <[e-mail]>
References: <1996Jan6.185503.8669@ohstpy>
NNTP-Posting-Host: zaurak.cis.ksu.edu
X-Newsreader: NN version 6.5.0 #6 (NOV)

[e-mail] (JIM GARLAND) writes:

>My only quibble with the kit is ....
>the traces seem to be extremely thin....

My first PC board (quite some years ago) was for a "boxcar"
(sample and hold) circuit, and it refused to work properly
until we jumpered one particular trace with a wire to increase
its current-carrying capacity.

I learned a lot in that project!

--Myron.
--
# Five boxes preserve our freedoms:  soap, ballot, witness, jury, and cartridg
e
# Myron A. Calhoun, PhD EE; Assoc. Prof.     [phone] work, 532-7353 fax
# Amateur packet radio: W0PBV@N0ARY.#NOCAL.CA.USA.NOAM            539-4448 hom
e
# NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol
)


From [e-mail] Tue Jan 30 16:26:10 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!cis.ksu.edu!mac
From: [e-mail] (Myron A. Calhoun)
Newsgroups: rec.radio.amateur.homebrew
Subject: What is an A59RX tube from Cetron?
Date: 27 Jan 1996 18:10:18 GMT
Organization: Kansas State Univ, Dept. of Computing and Information Sciences
Lines: 16
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: zaurak.cis.ksu.edu

Someone just gave me, the local certified "junk collector", a dozen
A59RX tubes in boxes, plus a couple of loose ones.  I can't find it
in any of my many manuals.  It LOOKS like some kind of photodetector,
with a half-cylinder "reflector", but, instead of running down the
axis, the "collector" wire is a square loop kinda runing around the
edge of the half-cylinder.

Can anyone tell me what it really is.  I won't add it to the clutter if
it doesn't have some potential use greater than a one-time rifle target.

--Myron.
--
# Five boxes preserve our freedoms:  soap, ballot, witness, jury, and cartridg
e
# Myron A. Calhoun, PhD EE; Assoc. Prof.     [phone] work, 532-7353 fax
# Amateur packet radio: W0PBV@N0ARY.#NOCAL.CA.USA.NOAM            539-4448 hom
e
# NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol
)


From [e-mail] Tue Jan 30 16:26:12 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!in1.uu.net!lexis-nexis!news
From: [e-mail] (Mike Suhar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB artwork transfer
Date: 27 Jan 1996 18:27:16 GMT
Organization: LEXIS-NEXIS
Lines: 61
Distribution: world
Message-ID: <4edqq4$[e-mail]>
References: <4edgss$[e-mail]>
NNTP-Posting-Host: n2dhcp174.lexis-nexis.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <4edgss$[e-mail]>, [e-mail] says..
.
>
>I am looking for successful ways to transfer printed artwork to board for
>etch resist.I seem to have a lot of difficulty cleaning paper off the
>board after transfer without damaging traces.I can use transparencies
>with no problems but paper backed images is another story.Is there
>someother paper besides   ordinary printer paper that  can be used?
>
>            73 Ken Burtchaell W6GHV
>
Ken,

While I use the toner transfer method to make quick boards I still fall back t
o
the photographic method for more complicated boards or those that I want to be

near perfect.  I have not found a way to get a good transfer from a paper
source.  I have been able to do it with photographic methods.

GC Electronics had a film (I guess they still do) that could be used to lift a
n
image from a printed source to create a negative.  It is an interesting proces
s
that they used.  They put the film on top of the paper immage.  They used the
reflectivity of the paper, white vs the black traces, to expose the film.  The

reflection caused more exposure over the white areas than the black traces. Yo
u
could create a positive or a negative.  One required a second sheet of film to

reverse the image.  This is more work than using a transparency for the
original artwork.  I don't use this method unless I a using artwork from a
magazine.

Most of the time I create my own artwork and print it on transparency using my

Laerjet 4+ printer.  I then purchase presensitized (positive type) PC boards
from PCB Kits.  I gave up on "spray your own resist" since I never could get
the stuff to stick or be consistant in thickness.  Lay the transparency over
the presensitized board between a piece of glass. Expose with a photoflood
light.  Develope the board in a developer from PCB Kits.  Let dry and then dum
p
in the etch tank.  It is actually easy to do and does not take much more time
than the toner transfer method.  You don't need a darkroom or any special
equipment.  I use a 40watt light bulb in my utility room when working with the

sensitized board.  The only "photograph" equipment I bought was the photoflood
.

A 3x6 single sided epoxy-glass board runs around $3.33, double sided is $3.81.
These are year old prices so they may have changed slightly.  Developer was
$4.95/quart the last time I bought some.  Standard board sizes range from 4x4
inches to 12x12.

I never see this company advertise in any ham magazines.  I ran across them at

the Dayton Hamvention several years ago.  I called them last week so I know
they are still in business.  Give them a call and request information if you
want to try the photography method.

PCB Kits
750 Mariday
Lake Orion, MI   48362
[phone]
Owner: Steven Springstube

Good Luck

Mike Suhar, WB8GXB

NOTE:  I am not affilated with PCB Kits.  I am just a customer that liked thei
r
product.



From [e-mail] Tue Jan 30 16:26:13 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.compuserve.com!newsmaster
From: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Baked Black Wrinkle Paint
Date: 27 Jan 1996 19:25:22 GMT
Organization: CompuServe Incorporated
Lines: 5
Message-ID: <4edu72$[e-mail]>
NNTP-Posting-Host: ad26-130.compuserve.com
Content-Type: text/plain
Content-length: 152
X-Newsreader: AIR Mosaic (16-bit) version 4.00.08.32


I'm looking for someone to replaint a small metal base in its original, black
wrinkle
color and finish.  Anyone out there that can help?

-Paul, N9AZ


From [e-mail] Tue Jan 30 16:26:13 1996
Path: news.epix.net!news.sprintlink.net!usit.net!news
From: [e-mail] (Steven Fritts)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Any Mods for TM-201?
Date: Sun, 28 Jan 1996 00:28:05 GMT
Organization: United States Internet, Inc.
Lines: 9
Message-ID: <4eeg4l$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bway-slip71.dynamic.usit.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.equipment:24193 rec.radio.amateur.homebrew:12976



Just wondered if there are any mods for the Kenwood TM-201 2 meter
rig.

Thanks,

Steve



From [e-mail] Tue Jan 30 16:26:14 1996
Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ LeBlanc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Thermally conductive epoxy for heat sinking????
Date: 28 Jan 1996 00:42:15 GMT
Organization: Central FL Listeners Group
Lines: 14
Message-ID: <4eegp7$[e-mail]>
NNTP-Posting-Host: @ppp167.gslink.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

I have a need for heat sinking a TO-220 to the instrument case without
using screws (dielectric breakdown/hi-pot test issues).  Any folk out
there know of such a compound?  I heard it exists (and is $$$), any
pointers out there would be much appreciated.  If you could e-mail me
a reply it would be best, as I can only access this group on weekends
(and my server doesn't keep postings for more than a few days- might
miss the replies).

Thanks in advance,

Russ

[e-mail]



From [e-mail] Tue Jan 30 16:26:15 1996
Path: news.epix.net!news.sprintlink.net!news.netnet.net!kryten.awinc.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: COIL WINDING PROGRAM  (freeware Win95 only)
Date: 28 Jan 1996 01:11:33 GMT
Organization: QRP Central
Lines: 24
Message-ID: <4eeig5$[e-mail]>
NNTP-Posting-Host: pme002.awinc.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

Coil Winding Program for Windows95   CBVSR1.ZIP

COILBUILDER VSR can be found on the SimTel network

1 example......

 ftp.coast.net
 /SimTel/Win95/HamRadio/cbvsr1.zip

 CBVSR1.ZIP  allows the Amateur Radio homebrew enthusiast to
 design a variety of inductors for QRP Ham radio projects.
 Winding data for powdered-iron, ferrite, air and temperature-stable
 VFO core inductors can be designed with this software.
 In addition, CBVSR.ZIP can read, write and print  ASCII files which are
 displayed in its integral text editor.  A linked Help file is included.


 Special requirements:  Windows 95 ,  mouse.

 FREEWARE


 Thanks



From [e-mail] Tue Jan 30 16:26:17 1996
Path: news.epix.net!news.sprintlink.net!usit.net!arcade-slip21.dynamic.usit.net!user
From: [e-mail] (Michael)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help: MS230 Mini o'scope
Date: 28 Jan 1996 05:17:52 GMT
Organization: United States Internet, Inc.
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: 199.1.54.37

I just acquired a Non-Linear Systems MS230 mini oscilloscope at a hamfest.
The thing works, but it has an oddity I can't figure out. With the trigger
set to "internal," everything works as it should. When I set it to "auto,"
it free-runs, as it should. But, then it will not sync to a signal at
all... it just continues to free-run. I went through the scope and tested
and/or swapped out just about every semiconductor in it (luckily, the ICs
are in sockets, and are common CMOS). Nothing helps. Anybody have one of
these things? Is it possible it was designed that way? Anybody have a
schematic for it? Please reply via email, and thanks for any help you can
give me. For that matter, is NLS still in business?

Michael


From [e-mail] Tue Jan 30 16:26:18 1996
Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!news.zeitgeist.net!news.pixi.com!pixihost
From: [e-mail] (Dave Jarrell)
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED BOOK FOR TIMEWAVE DSP-9
Date: Sun, 28 Jan 96 06:20:15 GMT
Organization: Amateur Radio Station AH6OB
Lines: 12
Message-ID: <4ef4js$[e-mail]>
NNTP-Posting-Host: gorgax18.pixi.com
X-Newsreader: News Xpress Version 1.0 Beta #4

Need help finding book for a Timewave DSP-9 Digital Signal Processor.



       From the Desk of:

         Dave Jarrell
Amateur Radio Station - AH6OB
         Honolulu, HI

  E-mail:  [e-mail]



From [e-mail] Tue Jan 30 16:26:18 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!hookup!news.nstn.ca!coranto.ucs.mun.ca!InfoNET.st-johns.nf.ca!sba3020
From: [e-mail] (Carl Hodder)
Newsgroups: rec.radio.amateur.homebrew
Subject: Golden Eagle Manual
Date: 28 Jan 1996 08:19:39 GMT
Organization: St. John's InfoNET
Lines: 6
Message-ID: <4efbir$[e-mail]>
NNTP-Posting-Host: infonet.st-johns.nf.ca
X-Newsreader: TIN [version 1.2 PL2]

Wanted a Service Manual for a Browning Golden Eagle MK III tube
type CB Radio. I am also trying to find out all about the Golden
eagle radios and clubs, usergroups, etc. E-mail me if you
have any info.

Thanks, Carl.


From [e-mail] Tue Jan 30 16:26:20 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!news.west.net!usenet
From: [e-mail] (qrk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Thermally conductive epoxy for heat sinking????
Date: Sun, 28 Jan 1996 09:02:56 GMT
Organization: Marginal
Lines: 20
Message-ID: <4efebc$[e-mail]>
References: <4eegp7$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: term1-26.sb.west.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Russ LeBlanc) wrote:

>I have a need for heat sinking a TO-220 to the instrument case without
>using screws (dielectric breakdown/hi-pot test issues).  Any folk out
>there know of such a compound?  I heard it exists (and is $$$), any
>pointers out there would be much appreciated.

Omega Engineering makes thermally conductive epoxies.  I suggest
getting their catalog since they have a few different types.  They are
very good at responding to queries.
  Phone:  [phone]
  Fax:  [phone]

You might want to check out Thermaloy [phone] or
Wakefield Engineering [phone].  One of them also make a
thermally conductive epoxy.

-
Mark Chun  |  [e-mail]  |  Santa Barbara, California



From [e-mail] Tue Jan 30 16:26:20 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!hearst.acc.Virginia.EDU!freenet.vcu.edu!cabell.vcu.edu!not-for-mail
From: [e-mail] (J. Sherwood Williams)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Date: 28 Jan 1996 14:46:52 -0500
Organization: Virginia Commonwealth University
Lines: 15
Distribution: world
Message-ID: <4egjrc$[e-mail]>
References: <4d7dvb$[e-mail]> <[e-mail]> <[e-mail]> <4e3aml$[e-mail]>
NNTP-Posting-Host: cabell.vcu.edu


There is a good article on adding a BFO to an AM transistor radio in
the August 1985 issue on QST Page 34 ... try your local library for a
copy of the article.

I want to add a BFO to the tiny Sony SW1 .... first, I need to get
hold of a copy of the schematics ...<sigh> guess its another $15.00
to Sony for the service manual. I don't know if I will be able to fit
the above circuit into the radio, because it requires a FT-50-43
toroid core and an IF transformer.; might be too bulky.




                 Robert S. Williams: KD4ZPH


From [e-mail] Tue Jan 30 16:26:21 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!EU.net!sun4nl!news.nic.surfnet.nl!news.pi.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Needs: Power Module for 1299 Mhz TX homebrew
Date: Sun, 28 Jan 96 15:26:45 PDT
Organization: Planet Internet
Lines: 20
Message-ID: <[e-mail]>
NNTP-Posting-Host: bre45.pi.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


Hello dr. Om's,

I need a power module for 23cm (1299 Mhz) applications
I'm running here the PI1GTB interlink station for TCPIP packetradio in the
Southern parts of the Netherlands...

For this pupose i'v build myself an Interlink-I sem-duplex tranceiver (german
design). The outputpower is only 600 mW

I'm now looking for a power module and schematics to build a little amplifier
for say 3 to 5 watts on 1299 Mhz..

Who can help..

Thanks for reading

73' pa0gtb, Cor




From [e-mail] Tue Jan 30 16:26:23 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.mtu.edu!news.mtu.edu!not-for-mail
From: [e-mail] (mike)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.antenna
Subject: Special Events Station!!!
Date: 28 Jan 1996 17:04:14 -0500
Organization: Michigan Technological University
Lines: 50
Message-ID: <4egrsu$[e-mail]>
NNTP-Posting-Host: techsrv1.tech.mtu.edu
X-Newsreader: TIN [version 1.2 PL1]
Xref: news.epix.net rec.radio.amateur.equipment:24230 rec.radio.amateur.homebrew:12991 rec.radio.amateur.misc:97371 rec.radio.swap:56161 rec.radio.amateur.digital.misc:13813 rec.radio.amateur.policy:32810 rec.radio.amateur.space:6209 rec.radio.amateur.antenna:18699

Thank-you for reading this.  My name is Michael Long (KB8WPE) and I am
the Public Relations Manager for the Husky Amateur Radio Club (HARC) whose
callsign is W8YY.  The club is located on the Michigan Technological
University campus.

Starting on February 1, 6am EST, and continuing on until February 3, 6am
EST, W8YY will be running a Special Events station for Michigan Tech's
Winter Carnival '96.  The frequencies listed below are the most likely
place we will be operating.  For this Special Events station we have
8"x11" certificates that would look great on anyones' wall!  All you
have to do is contact us and then send a QSL with a self addressed stamped
envelope to receive the certificate.

Here are the frequencies:

Band            Frequency               Mode            Time
160m            1.90 MHz                LSB             8pm-8am
75m             3.90 MHz                LSB             10pm-8am
40m             7.25 MHz                LSB             7pm-10pm
20m             14.250 MHz              USB     majority of the day (8am-7pm)
17m             18.150 MHz              USB     if open 8am-7pm
15m             21.350 MHz              USB     if open 8am-7pm
10m             28.40  MHz              USB     if open 8am-7pm
2m              144.2 MHz               USB             All the time
                146.58 MHz              FM              All the time
70cm            432.100 MHz             USB             All the time


Again, thank-you for reading this message and all of us here hope to
here from you during the Special Events station!

For any more info. email me at [e-mail] or the Club President,
Dave Gillahan, at [e-mail]

You can also check out our homepage at
http://techsrv1.tech.mtu.edu:8080/harc.html
Though it is just beginning it does have a little information on it.

Sincerely,
Mike Long -KB8WPE-


--
 /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
 \ Michael Long               ||   Public Relations Manager /
 / Callsign:  KB8WPE          ||        for HARC (W8YY)     \
 \ Email:     [e-mail]  ||    Email:  [e-mail]  /
 / Phone:     [phone]   ||     Majors:  EET and EMT   \
 \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/



From [e-mail] Tue Jan 30 16:26:25 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: WANT YIG
Date: 28 Jan 1996 17:08:34 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <4egs52$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)
NNTP-Posting-Host: newsbf02.mail.aol.com




Need Yig Oscillator for BWO replacement in spectrum analyzer.

VINYN1VC


From [e-mail] Tue Jan 30 16:26:26 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4e6tbm$[e-mail]> <4e9a5d$[e-mail]>
Date: Sun, 28 Jan 1996 20:46:39 GMT
Lines: 38

In article <4e9a5d$[e-mail]> [e-mail] (Prowler) writes:
>WD-40 is great stuff.  I used to work building bridges and several
>times my walkie talkie (ham) fell into the salt water.  My standard
>procedure was to leave it where it fell, remembering where it was.  I
>would go back after work with SCUBA, retrieve the radio and put it
>into a bucket of water from the bay.  Then upon returning home, I
>would dip the radio into alcohol and blow it out with air pressure.  I
>did that several times until I was sure all the water I could get to
>was displaced.  Then, I would spray it full of WD-40 and blow it out
>again, doing this at least two times to get the WD-40 into all the
>crevices.  I never damaged a radio and did this at least 4 times with
>one unit.  Only the battery wire from the terminal to the battery
>would burn out while it was under water.  I would take the radio to
>work the next day.

WD-40 is a good water displacer (that's what the WD stands for),
it's a fair penetrating oil, and a poor lubricant. It can leave
a sticky residue which can accumulate and hold dirt. There are
better products for each of its uses, though few are as universal.

A better way to deal with electronic equipment dunked in salt
water is to soak it in a warm fresh water bubble bath solution
for an hour or two. Then rinse is throughly with clean warm
water. This will remove the salt residue much more completely
than using alcohol or WD-40, neither of which are solvents for
salt. You can then blow out as much water as possible and let
it air dry in a warm dry place overnight. This is what we do
to cameras our photographers dunk in salt water. We avoid
using WD-40 because of its residue's unfortunate tendency to
accumulate and trap dirt, which isn't good for the optics or
the recorder mechanism.

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


From [e-mail] Tue Jan 30 16:26:27 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!crl11.crl.com!not-for-mail
From: [e-mail] (Michael Stone)
Newsgroups: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy
Subject: Re: TSCM Counter Surveillance & Technical Security Page
Followup-To: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy
Date: 28 Jan 1996 21:13:08 -0800
Organization: CRL Dialup Internet Access
Lines: 19
Message-ID: <4ehl14$[e-mail]>
References: <[e-mail]>
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Xref: news.epix.net rec.radio.scanner:44567 rec.radio.shortwave:69400 misc.legal.computing:19838 comp.security.unix:24081 rec.radio.amateur.antenna:18708 rec.radio.amateur.equipment:24256 rec.radio.amateur.misc:97399 rec.radio.amateur.digital.misc:13821 rec.radio.amateur.homebrew:12997 rec.radio.amateur.policy:32827

James M. Atkinson, Communications Engineer ([e-mail]) wrote:

: Here is the current list of frequencies used for bugging, technical
: surveillance and similar activities.

:        Outband Equipment
:        ANY Television broadcast or Cable TV frequency
:        ANY FM radio broadcast frequency
:        ANY Paging or Beeper frequency
:        ANY Cellular Telephone frequency

:        Keep in mind that the federal government can use virtually any
:        frequency between DC and light.

: Summary (this will catch 99.99% of all Non-Intell/Diplomatic RF bugs)

Gee whiz.




From [e-mail] Tue Jan 30 16:26:28 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!news.jersey.net!ns2.mainstreet.net!sloth.swcp.com!usenet
From: [e-mail] (Gary Bonebrake)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: 3CX800A7 & More
Date: 28 Jan 1996 21:38:20 GMT
Organization: Southwest Cyberport
Lines: 13
Message-ID: <4egqcc$[e-mail]>
NNTP-Posting-Host: ppp67.swcp.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
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FOLLOWING ITEMS UP FOR GRABS:
                                                       UNIT
ITEM  QTY   PARTNO    MANUF     CONDITION              PRICE
----  ---   --------  --------  --------------------   -----
 1     1    3CX800A7  EIMAC     NEW - SEALED BOX       $300
 2     2    811A      SVETLANA  NEW - WITH               15
                                SOCKETS & PLATE CAPS
 3     2    4CX250B   EIMAC     BOX MARKED "SPARE"       20
 4     2    4CX400A   SVETLANA  NEW - WITH              175
                                SOCKETS & PLATE CAPS
ADDS UP TO $720 . . . WILL UNLOAD LOT FOR $450, INCL SHIPPING.
CONTACT [e-mail] - NO PHONE CALLS PLEASE.



From [e-mail] Tue Jan 30 16:26:29 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!miwok!news.wco.com!m14
From: [e-mail] (Ed Gallup)
Newsgroups: rec.radio.amateur.homebrew
Subject: wrinkle paint
Date: Sun, 28 Jan 96 22:22:35 GMT
Organization: Mother Lode InterNet
Lines: 6
Message-ID: <4egsuk$[e-mail]>
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X-Newsreader: News Xpress Version 1.0 Beta #4


   Can anyone advise where wrinkle paint may be obtained, (such as black or
gray), or how it may be made.  Thanks.

   Ed   [e-mail]



From [e-mail] Tue Jan 30 16:26:30 1996
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From: [e-mail] (James P. Meyer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: tuning in CW/SSB stations w/ AM only radio?
Date: Sun, 28 Jan 1996 23:19:07 GMT
Organization: Duke University, Durham, NC, USA
Lines: 12
Message-ID: <[e-mail]>
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NNTP-Posting-Host: async139.async.duke.edu
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[e-mail] (J. Sherwood Williams) wrote:

>I want to add a BFO to the tiny Sony SW1 .... first, I need to get
>hold of a copy of the schematics ...<sigh> guess its another $15.00
>to Sony for the service manual. I don't know if I will be able to fit
>the above circuit into the radio, because it requires a FT-50-43
>toroid core and an IF transformer.; might be too bulky.

     No reason I know of why it *has* to be internal.  Just build it in a
small (plastic) box with its own battery and put it close to the SW1.

        Jim


From [e-mail] Tue Jan 30 16:26:31 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!vitro.com!usenet
From: [e-mail] (Robert Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need help to reduce mobile Hf Rig  noise from Jeep Wrangler computer module
Date: 29 Jan 1996 13:13:28 GMT
Organization: Vitro Corp
Lines: 10
Message-ID: <4eih5o$[e-mail]>
NNTP-Posting-Host: bmiller.ms.vitro.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

I have an Icom 706 in my 1994 Jeep Wangler and I get a great deal of QRM
(s9) noise when the ignition switch is in the on position even when the
motor is not running.  If i pull the fuse for the car's computer module
the noise goes away.  Does anyone know of a way to reduce this noise
problem.

Thanks for any help.

Bob (N3TXB)



From [e-mail] Tue Jan 30 16:26:32 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!tank.news.pipex.net!pipex!demon!survival.demon.co.uk
From: [e-mail] (Bill Wright)
Newsgroups: rec.radio.amateur.homebrew
Subject: Chip set for SSB Short Wave Transmitter/Receiver
Date: Mon, 29 Jan 1996 14:28:02 GMT
Organization: Survival Power
Lines: 13
Message-ID: <[e-mail]>
Reply-To: Bill Wright
NNTP-Posting-Host: survival.demon.co.uk
X-NNTP-Posting-Host: survival.demon.co.uk
X-Newsreader: Forte Free Agent 1.0.82


Chip set for SSB Short Wave Transmitter/Receiver

I am initiating a new design for a SSB Short Wave Transmitter/Receiver
operating at 4.005 Meg.  A chip set is required to form the base of
the design.  Pre production prototype is scheduled for completion June
96.

Would be grateful for any information or help.





From [e-mail] Tue Jan 30 16:26:33 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!uwm.edu!math.ohio-state.edu!usc!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: wrinkle paint
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4egsuk$[e-mail]>
Date: Mon, 29 Jan 1996 15:17:09 GMT
Lines: 26

In article <4egsuk$[e-mail]> [e-mail] (Ed Gallup) writes:
>
>   Can anyone advise where wrinkle paint may be obtained, (such as black or
>gray), or how it may be made.  Thanks.
>
>   Ed   [e-mail]

Most good hardware stores carry an extensive line of spray paints,
including wrinkle finish black. Try an Ace Hardware, True Value
Hardware, or Home Depot. I prefer Krylon brand but there are others.

One trick to getting a good wrinkle finish is to make sure the item
to be painted is warm, and warm it further after painting. I sit the
object on top of the boiler jacket (about 120 F) of the buidling heating
system. In about 45 minutes to an hour, you'll have a nice wrinkle finish.

One caution, for some reason only black gives a good wrinkle finish.
If you want a different color, get the wrinkle with black, and then
top that with whatever color you want after the black dries and wrinkles.

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


From [e-mail] Tue Jan 30 16:26:34 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Radio Amateur Microwave Groups
Date: 29 Jan 1996 15:53:58 GMT
Organization: Dover Research Corp.
Lines: 4
Message-ID: <4eiqim$51g$[e-mail]>

I just made my first contact on 1296.1MHZ  So if you find such an area sign me
up as well!
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Tue Jan 30 16:26:35 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Baked Black Wrinkle Paint
Date: 29 Jan 1996 15:57:09 GMT
Organization: Dover Research Corp.
Lines: 11
Message-ID: <4eiqol$51g$[e-mail]>

I asked this same question a few years back.  I was told that Harly Davidson
dealers can order black Crackle paint that should be exactly what you want.
Note that you need to do more than paint it on.  It needs to cure in an oven
and I can't comment on that.  If you are an ARRL member you might want to
contact Member services and ask for any old pieces on doing this properly.
I just know some old QST bit has to talk about this.  BTW I've got an old J-36
Bug (WWII Era) that some nut painted lime green.  I'm going to figure out how
to do this as well.  Just don't know when I will have the time,.
GL 73 CUL
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Tue Jan 30 16:26:36 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: League publishes yet another mpu article sans software
Date: 29 Jan 1996 16:02:25 GMT
Organization: Dover Research Corp.
Lines: 12
Message-ID: <4eir2h$51g$[e-mail]>

Hi Gary, I have to check that out and see what your talking about.  I'm no
doubt totaly off base but I often get calls about things that are in the
user manual.  When I say "uhh have you read the manual." some folk get really
teed off at me.  "Why should I do that when I have your home phone #?"
<grin>  Anyhow I wonder if suggesting another book, Say Bill Or handbook
would get you ire up?  Is it just the self promotion angle?  Or the lack of
answers?  If it is self promotion remember what Grandma said, "The squeeky
oil gets the greese!"  Or, "If I don't toot my horn who will?"  Uncle Wayne?
Anyway stop breaking all that stuff!!! <grin>
73 CUL
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Tue Jan 30 16:26:37 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED schematic of a IF-100 interface!
Date: 29 Jan 1996 16:03:34 GMT
Organization: Dover Research Corp.
Lines: 3
Message-ID: <4eir4m$51g$[e-mail]>

Is the IF-100 the Yeasu RS232 converter?
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Tue Jan 30 16:26:38 1996
Message-ID: <[e-mail]>
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!news.eunet.fi!anon.penet.fi
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (sorbie)
X-Anonymously-To: rec.radio.amateur.homebrew
Organization: Anonymous forwarding service
Reply-To: [e-mail]
Date: Mon, 29 Jan 1996 16:12:58 UTC
Subject: Need ferrite beads.....
Lines: 14

     Anyone know where I can find some ferrite beads suitable for
"RF choking" #22/#24 wiring to a FP connector on my transceiver?

     E-mail direct to [e-mail].

TNX ES 73,

Paul, K4MSG

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From [e-mail] Tue Jan 30 16:26:39 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ncrgw2.ncr.com!ncrhub2!ncrcae!news
From: Bob Archer <[e-mail]>
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Message-ID: <[e-mail]>
Sender: [e-mail] (news)
Reply-To: [e-mail] (archer)
Organization: NCR GPGSC, Columbia
X-Newsreader: DiscussIT 2.5.1.3 for MS Windows [AT&T Software Products Division]
References: <4eiks1$[e-mail]>
Date: Mon, 29 Jan 1996 16:17:07 GMT
Lines: 39

Jim,
       I'm with you in regards to dunking. But back in the
1950's I watched my father wash out radio chassis's with mineral
spirits followed by soapy(Tide) water. He never dunked them,
used a paint brush & quick rinse.  He would also set them in the
sun for a few days before reassembly. These were ones he
purchased, fixed & resold.

       I now collect some of the same type that he did that to,
but I don't think I will ever wash any of mine that way.

Thanks for reminding me of the memories....


>==========James Garland, 1/29/96==========
>
>The suggestion to soak dirty rigs in warm water with bubble bath
>raises a
>question I've wondered about for years. I recall reading a Tektronix
>service note years ago, in which dirty Tek scopes were washed out with
>warm soapy water, rinsed, and air dried at a warm (100 degree)
>temp for a
>day or so. If I recall correctly (I read this about 30 years ago), the
>xfmrs were removed, and afterwards the paper caps were replaced, and
>switches lubricated.
>
>I've never had the nerve to try this technique.  I just can't bring
>myself to dunk, say, my Central Electronics 100V in the bathtub and let
>it soak. I'd be interested in knowing others' experience with this
>cleaning method. Is it really necessary to remove the
transformers? What
>happens to the cardboard sleeves of IF transformers? Does it hopeless
>ruin paper capacitors? Are there other precautions to take?
>
>Jim W8ZR
>


Bob Archer N4ECO


From [e-mail] Tue Jan 30 16:26:40 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Thermally conductive epoxy for heat sinking????
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <4eegp7$[e-mail]> <4efebc$[e-mail]>
Date: Mon, 29 Jan 1996 16:18:34 GMT
Lines: 10
Sender: [e-mail]

qrk ([e-mail]) wrote:
: Omega Engineering makes thermally conductive epoxies.  I suggest
: getting their catalog since they have a few different types.

Since thermal compound is essentially zinc oxide mixed with
grease, I wonder if zinc oxide powder mixed with a little epoxy
as a binder would be an acceptable thermal epoxy?  I suspect it
would work fine for many applications.

Thomas KI4N


From [e-mail] Tue Jan 30 16:26:41 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: 9-pin plugs for EFJ
Date: 29 Jan 1996 16:41:01 GMT
Lines: 11
Message-ID: <4eitat$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

Are you talking about the 9-pin octal-type power plugs
and jacks?  If so, I probably have a couple of each in
my junque-box.  Please confirm that this is what you
are looking for, describe EXACTLY the style you need,
and I'll see if I have any.  If I do, they're yours
free, if you repay the postage.

Reply via private e-mail.  73, Dean KC5NG

                           [e-mail]



From [e-mail] Tue Jan 30 16:26:42 1996
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From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CMOS SUPERKEYER II CURRENTS
Date: 29 Jan 1996 16:46:02 GMT
Lines: 13
Message-ID: <4eitka$[e-mail]>
References: <[e-mail]> <4cmpim$[e-mail]> <4d9rgp$[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

The Super Keyer II is referred to as the K-1 Logi-Key
these days.  It's a fantastic invention!  I built the
November, 1990 QST version back then, still have it,
no problems ever, only needs batteries changed about
once a year, and I use it heavily.

This is such a good design that Kenwood included it
in the new TS-870S as standard equipment, with six
pages in the manual telling how to use it.

Wonderful device!  Gotta have it!!
                                      73 de KC5NG



From [e-mail] Tue Jan 30 16:26:42 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: wrinkle paint
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <4egsuk$[e-mail]>
Date: Mon, 29 Jan 1996 17:10:14 GMT
Lines: 25
Sender: [e-mail]

Ed Gallup ([e-mail]) wrote:
: Can anyone advise where wrinkle paint may be obtained, (such as black
: or gray), or how it may be made.  Thanks.

PEP Boys "Manny, Moe, and Jack" automotive stores sell black wrinkle
finish spray paint. It works fine. But follow the instructions on the
can for best results.

The manufacturer and part number is:

          plasti-kote Wrinkle Finish
          No. 217 Black

          plasti-kote Co. Inc.
          Medina, Ohio 44256

As I recall, several other colors are also available. If you don't have
a PEP Boys nearby, then a hobby shop, paint store or hardware store could
probably order it for you. It is not expensive, about the same price
as any spray paint.

73,

Thomas KI4N



From [e-mail] Tue Jan 30 16:26:44 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr9ip18.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Looking for mechanical filters.
Date: Mon, 29 Jan 1996 19:14:51 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 39
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: usr9ip18.azstarnet.com
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Xref: news.epix.net rec.radio.amateur.homebrew:13021 rec.radio.swap:56283

In article <[e-mail]> Mark Mansfield <[e-mail]> writes:
>From: Mark Mansfield <[e-mail]>
>Subject: Looking for mechanical filters.
>Date: Sun, 28 Jan 1996 21:04:34 -0600

>I'm looking for a pair of Collins (or equiv.) mechanical filters for a
>CW receiver which I'm building. I'm planning on using one of the filters
>in the front of the IF and using another in the "tail-ended" mode after
>the last IF amp. The filters should be the same frequency with the tail-
>ended filter 100 to 200 hertz wider than the first filter (this was
>recommended in a book by Doug DeMaw although the same bandwidth should
>work as well if the filters have the same frequency).

>If you have any of these critters, drop me a note with specifics such
>as part number, bandwidth and price.

>I would also like to hear from anyone else that has used this technique
>in a home built receiver.

Haven't used Collins filters but have used 9 MHz KVGs in this application.
(XF9B input, XF9A output) I know there is a theoretical advantage to having
the second filter, but I didn't note much improvement in my HB receiver. There

can be a complication in the AGC system though. After conversation with Wes
Haywood, I decided to move the AGC pickoff ahead of the second filter. The
time delay through the second filter was causing severe AGC pumping. See
KN5S's article in a recent QEX for more on this.

Assuming no i-f overload and a decent product detector, you basically suffer
no more than 3 dB extra noise at the audio amp without the second filter. Of
course if the first filter has poor stopband rejection or there is leakage
around it, the second filter can help.

Good luck,

Wes -- N7WS

>Thanks,
>Mark



From [e-mail] Tue Jan 30 16:26:45 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!in1.uu.net!fred.net!triack.fred.net!user
From: [e-mail] (John Stalnaker)
Newsgroups: rec.radio.amateur.homebrew
Subject: SOURCE Code for SSTV
Date: Mon, 29 Jan 1996 23:42:10 -0500
Organization: FredNet - Frederick, Md.
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: triack.fred.net

looking for any source code for sstv

thanks
N3VTV
John Stalnaker


From [e-mail] Tue Jan 30 16:26:46 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!wb3ffv!ppp48.bcpl.lib.md.us!dbaker
From: [e-mail] (Donald I. Baker)
Subject: Re: 82 Repeater in Kansas City
Sender: [e-mail]
Message-ID: <[e-mail]>
Date: Tue, 30 Jan 1996 10:21:39 GMT
X-Nntp-Posting-Host: ppp48.bcpl.lib.md.us
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In article <[e-mail]> [e-mail] (Rob Janssen) writ
es:
>From: [e-mail] (Rob Janssen)
>Subject: Re: 82 Repeater in Kansas City
>Date: Tue, 30 Jan 1996 09:24:14 GMT

>In <[e-mail]> Eddie Caffray <[e-mail]> writ
es:

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

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

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


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

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

Good luck and Have fun.

Don




Donald I. Baker
Reville Engineering Services
4619 Schenley Road
Baltimore, MD 21210-2525
[phone]
Custon Harsh Environment
Computers and RF Products
"Where no PC has gone before..."


From [e-mail] Tue Jan 30 16:26:47 1996
Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Jon Bloom <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: CCITT fax via radio?
Date: Tue, 30 Jan 1996 12:35:27 -0500
Organization: American Radio Relay League
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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Xref: news.epix.net rec.radio.amateur.digital.misc:13846 rec.radio.amateur.homebrew:13022

I'm looking for information from anyone who has developed a technique for
transferring CCITT group-3 fax (i.e., standard office fax machine data) via
radio. The "ideal" system would be one wherein a person at point A stuffs a
document into a fax machine and it comes rolling out of a fax machine at
point B, with the connection between the points being a radio link. But I'm
interested in *any* techniques being used to achieve fax-via-radio. (Note:
NOT WEFAX, APT or what-have-you. Just G3 fax!)

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


From [e-mail] Mon Feb 05 21:32:20 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!news.cerf.net!newsserver.sdsc.edu!newshub.csu.net!charnel.ecst.csuchico.edu!waldorf.csc.calpoly.edu!isnews.csc.calpoly.edu!farad.elee.calpoly.edu!ceustaqu
From: Cal Eustaquio <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: 9-pin plugs for EFJ
Date: Thu, 25 Jan 1996 16:40:57 -0800
Organization: Cal Poly, San Luis Obispo
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-User: [e-mail]
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Who still carries these? I would like to buy some for replacing some
broken one on my Ranger/Invader/Valiant. I appreciate any assistance on
this. 73's. Cal.


From [e-mail] Mon Feb 05 21:32:21 1996
Path: news.epix.net!news.sprintlink.net!guitar.sound.net!news.sprintlink.net!usit.net!arcade-slip21.dynamic.usit.net!user
From: [e-mail] (Michael)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help: MS230 Mini o'scope
Date: 28 Jan 1996 05:20:13 GMT
Organization: United States Internet, Inc.
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: 199.1.54.37

I just acquired a Non-Linear Systems MS230 mini oscilloscope at a hamfest.
The thing works, but it has an oddity I can't figure out. With the trigger
set to "internal," everything works as it should. Of course, the trace
goes out when the trigger is not locked. (It's supposed to do that.)  When
I set it to "auto," it free-runs, as it should. But, then it will not sync
to a signal at all... it just continues to free-run, making the auto
function useless. On all other scopes I've ever used, auto will make it
free-run when unlocked, and then it reverts to a locked condition when the
trigger syncs to the signal.

I went through the scope and tested and/or swapped out just about every
semiconductor in it (luckily, the ICs are in sockets, and are common
CMOS). Nothing helps. Poking around with my other scope turned up nothing,
either. Anybody have one of these things? Is it possible it was designed
that way? Anybody have a schematic for it? Please reply via email, and
thanks for any help you can give me. For that matter, is NLS still in
business?

Michael


From [e-mail] Mon Feb 05 21:32:23 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!microvst.demon.co.uk
From: "Anthony R. Gold" <[e-mail]>
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: 82 Repeater in Kansas City
Date: Sun, 28 Jan 96 17:22:55 GMT
Organization: Microvest Limited, London
Lines: 19
Message-ID: <[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: microvst.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: microvst.demon.co.uk
Xref: news.epix.net rec.radio.amateur.policy:32944 rec.radio.amateur.antenna:18812 rec.radio.amateur.equipment:24433 rec.radio.amateur.homebrew:13071 rec.radio.amateur.digital.misc:13903

In article <[e-mail]>
           [e-mail] "Eddie Caffray" writes:

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

That's a weird story.  The jerk behaves badly enough to be banned but is
obedient enough to obey your request that he voluntarily not transmit on
the legally licensed (input) frequency.  Were there some strong words of
`encouragement' that went with the banning?

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


From [e-mail] Mon Feb 05 21:32:24 1996
Path: news.epix.net!news.sprintlink.net!HiWAAY.net!imci2!news.internetMCI.com!darwin.sura.net!gaia.ns.utk.edu!usenet
From: Mark Mansfield <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Looking for mechanical filters.
Date: Sun, 28 Jan 1996 21:04:34 -0600
Organization: Univ. of Tenn at Martin
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: dialup08.utm.edu
Mime-Version: 1.0
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Xref: news.epix.net rec.radio.amateur.homebrew:13066 rec.radio.swap:56515

I'm looking for a pair of Collins (or equiv.) mechanical filters for a
CW receiver which I'm building. I'm planning on using one of the filters
in the front of the IF and using another in the "tail-ended" mode after
the last IF amp. The filters should be the same frequency with the tail-
ended filter 100 to 200 hertz wider than the first filter (this was
recommended in a book by Doug DeMaw although the same bandwidth should
work as well if the filters have the same frequency).

If you have any of these critters, drop me a note with specifics such
as part number, bandwidth and price.

I would also like to hear from anyone else that has used this technique
in a home built receiver.

Thanks,
Mark


From [e-mail] Mon Feb 05 21:32:25 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!lynx.unm.edu!bubba.NMSU.Edu!not-for-mail
From: [e-mail] (beard)
Newsgroups: rec.radio.amateur.homebrew
Subject: Books for Sale
Date: 29 Jan 1996 06:22:45 GMT
Organization: New Mexico State University
Lines: 11
Message-ID: <4ehp3l$[e-mail]>
NNTP-Posting-Host: acca.nmsu.edu
X-Newsreader: TIN [UNIX 1.3 950621BETA PL0]

Hints and Kinks for the Radio Amateur
Solid  State Design for the Radio Amateur
Solid State basics for the Radio Amateur

I do very little of this type of thing now.
If you want them they are yours for $1.00 each
I'd rather you take all three for $3.00 + postage.

David Beard
WA4QGA



From [e-mail] Mon Feb 05 21:32:26 1996
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.homebrew,rec.radio.swap
Path: news.epix.net!uunet!in2.uu.net!xenitec!nic.wat.hookup.net!noc.tor.hookup.net!baton.com!nobody
From: [e-mail] (Wayne Johnson)
Subject: Re: Eddystone receiver 4 sale
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: Baton Broadcasting
Date: Mon, 29 Jan 1996 14:42:20 GMT
References: <3posdv$mml$[e-mail]>
X-Newsreader: Forte Free Agent 1.0.82
Lines: 20
Xref: news.epix.net rec.antiques.radio+phono:15572 rec.radio.amateur.homebrew:13122 rec.radio.swap:56749

Old Man <[e-mail]> wrote:

>Eddystone 830/7 receiver in excellent condition.  A few scratches
>but very nice.  Have a full set of spare tubes and manual.
>This model last tube receiver made by Eddystone.  Rare here in
>USA.  $600 OBO plus shipping.
>Sandy W5TVW

I subscribed to this newsgroup for the first time on Friday, and yours
was the first post I read. I went home on the weekend and dusted off
my Eddystone S750/1 which had been in storage for about 15 years,
plugged it in and it still works like a charm. It's in excellent
condition and includes the matching external speaker. Can anyone tell
me anything about it's history, rarity, current value, etc.?

Thanks

Wayne Johnson
Sudbury, Ontario



From [e-mail] Mon Feb 05 21:32:27 1996
Path: news.epix.net!uunet!in1.uu.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Baked Black Wrinkle Paint
Date: 29 Jan 1996 16:43:26 GMT
Lines: 25
Message-ID: <4eitfe$[e-mail]>
References: <4edu72$[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <4edu72$[e-mail]>,
[e-mail] says...
>
>
>I'm looking for someone to replaint a small metal base in its original, bla
>ck wrinkle
>color and finish.  Anyone out there that can help?
>
>-Paul, N9AZ

You can do this yourself, and get great results!  The
paint is sold at auto parts stores in spray cans.  I
use it frequently to paint radio cabinets and such.
Baking isn't necessary if you wait 'til the summer
and let the painted item sit in the hot sun for a few
hours (works well in 100 degree Texas heat!).  Much
of the time, I don't even strip off the old paint,
because the wrinkle finish is thick enough and coarse
enough to hide imperfections in the old base coat.

Be sure to read the directions on the spray can!

Good luck!
                 73 de KC5NG



From [e-mail] Mon Feb 05 21:32:29 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in1.uu.net!despina.neptune.com!news.jsums.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4e6tbm$[e-mail]> <4e9a5d$[e-mail]> <[e-mail]> <4eiks1$[e-mail]>
Date: Mon, 29 Jan 1996 16:45:51 GMT
Lines: 55

In article <4eiks1$[e-mail]> James Garland <garland@ohst
py.mps.ohio-state.edu> writes:
>The suggestion to soak dirty rigs in warm water with bubble bath raises a
>question I've wondered about for years. I recall reading a Tektronix
>service note years ago, in which dirty Tek scopes were washed out with
>warm soapy water, rinsed, and air dried at a warm (100 degree) temp for a
>day or so. If I recall correctly (I read this about 30 years ago), the
>xfmrs were removed, and afterwards the paper caps were replaced, and
>switches lubricated.
>
>I've never had the nerve to try this technique.  I just can't bring
>myself to dunk, say, my Central Electronics 100V in the bathtub and let
>it soak. I'd be interested in knowing others' experience with this
>cleaning method. Is it really necessary to remove the transformers? What
>happens to the cardboard sleeves of IF transformers? Does it hopeless
>ruin paper capacitors? Are there other precautions to take?

Paper components can be a problem. They swell when wet, and won't
go back to their original dimensions when dried. If the paper wrap
of a power transformer is well varnished, it may not swell, but there
is a risk. Paper capacitors, and electrolytic capacitors with paper
sleeves, will be ruined. The tuning scales on some old radios are
paper based, and they can be ruined too unless they are heavily
oiled or waxed.

The bubble bath method works well on modern equipment, which has
little or no paper components, and warm water is about the only
thing that's effective if salt water has been in the equipment,
because you've *got* to get all the salt out or you'll have
continuing corrosion problems, and besides, the salt water would
have ruined any paper components anyway.

I've put old WWII equipment in the dishwasher. Dishwasher detergent
is really harsh, but boy does it clean well. You're going to have
to replace the old paper capacitors in that equipment anyway, just
due to age, so that's not much of a concern. And the hot water will
soften or remove wax that may be used to seal adjustable coils, but
the rig will probably need an alignment anyway, so that's not a big
concern either. But the dishwasher detergent can etch aluminum, and
aluminum parts can come out frosted instead of shiny, so you might
think about that before pitching that old radio in the dishwasher.
Any bare aluminum parts that will show should probably be removed.
Painted or anodized aluminum is Ok to put in the dishwasher. Steel
parts will do fine too, just don't use the dry cycle. There's heat
and humidity during the dry cycle that'll rust bare steel for sure.
Take the radio out after the wash cycle, blow out all the water
you can, and leave the radio in a warm low humidity place overnight
to finish drying (a very slightly warm oven can be used to hasten
the process, but don't overdo the heat).

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


From [e-mail] Mon Feb 05 21:32:31 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!news.bu.edu!transfer.stratus.com!news3.near.net!yale!news-mail-gateway!daemon
From: [e-mail] (Steve Schiller)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: GR874 to type N cable or adapters
Date: 29 Jan 1996 17:13:54 -0500
Organization: Yale CS Mail/News Gateway
Lines: 13
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: babyblue.cs.yale.edu

Hi,

I am in the market for three GR874 to type N or SMA (preferably male) cables.
50 ohm. Any length from 6" to 2'. These cost about $64 each new
(from Pasternack Enterprises), so I am looking for something
considerably cheaper.
In addition I need one GR874 to BNC adapter.

I might not be reading e-mail again until Feb 5, but you can reach
me by phone at [phone] from 10am to 11pm PST.

thanks,
 - Steve


From [e-mail] Mon Feb 05 21:32:31 1996
Path: news.epix.net!uunet!in2.uu.net!kiwi.crown.net!usenet
From: jessica <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ham software wanted
Date: 29 Jan 1996 17:19:13 GMT
Organization: Crown Net Inc.
Lines: 6
Distribution: world
Message-ID: <4eivih$[e-mail]>
NNTP-Posting-Host: crown12.crown.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)

hi  name is toby call  is n9fdf. i new to the www.
i would like to know where i can find a good place
to donwload some ham software here on the net...
73




From [e-mail] Mon Feb 05 21:32:33 1996
Path: news.epix.net!news.sprintlink.net!nntp.inc.net!novia!news.dpc.net!news.heurikon.com!uwvax!frankensun.altair.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs
From: [e-mail] (Robert Smits)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Message-ID: <[e-mail]>
Date: Mon, 29 Jan 1996 19:09:00 PST
References: <4e6tbm$[e-mail]> <4e9a5d$[e-mail]> <[e-mail]> <4eiks1$[e-mail]>
Reply-To: [e-mail]
Distribution: world
Organization: The Curmudgeon's Cottage
X-Newsreader: Rnf 0.79b6
Lines: 35

James Garland <[e-mail]> writes:

>The suggestion to soak dirty rigs in warm water with bubble bath raises a
>question I've wondered about for years. I recall reading a Tektronix
>service note years ago, in which dirty Tek scopes were washed out with
>warm soapy water, rinsed, and air dried at a warm (100 degree) temp for a
>day or so. If I recall correctly (I read this about 30 years ago), the
>xfmrs were removed, and afterwards the paper caps were replaced, and
>switches lubricated.
>
>I've never had the nerve to try this technique.  I just can't bring
>myself to dunk, say, my Central Electronics 100V in the bathtub and let
>it soak. I'd be interested in knowing others' experience with this
>cleaning method. Is it really necessary to remove the transformers? What
>happens to the cardboard sleeves of IF transformers? Does it hopeless
>ruin paper capacitors? Are there other precautions to take?

Never tried it with a scope. I have tried it with an 8 track tape player
(in their heyday) whose owner had tried to improve the grip of the rubber
belt drive by liberally smearing it with honey. Naturally, it crystallized
into a very hard lump.

I soaked it for several hours, shook all the water off, and let it air dry
in a stream of warm air from a nearby cooling fan for several days. After
relubrication and a new belt, it was fine.

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

Bob, VE7HS
--
[e-mail]

In the first place God made idiots; this was for practice;
then he made school boards - Mark Twain


From [e-mail] Mon Feb 05 21:32:34 1996
Path: news.epix.net!uunet!in1.uu.net!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!yama.mcc.ac.uk!io.salford.ac.uk!aber!bath.ac.uk!morse.ukonline.co.uk!ukonline.co.uk!david.j2
From: David Johnson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: JVFAX pcb layout ???
Date: Mon, 29 Jan 1996 19:31:15 +0000
Organization: (NON)
Lines: 8
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: lon3-1.ukonline.co.uk
Mime-Version: 1.0
X-Newsreader: Turnpike Version 1.11 <JF5qshqoaRxaDLk3L0sn4P5X$Q>

Hi All,

Does anyone have a pcb layout for the AM/FM JVfax interface? That's the
one with the LTC1099 i/c on it.

Thanks in advance

David Johnson G4AON, e-mail to [e-mail]


From [e-mail] Mon Feb 05 21:32:35 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!paladin.american.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: License Exams
Date: 29 Jan 96 22:29:33 GMT
Organization: ucsd usenet gateway
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Does anyone know of any license exam sessions in the Houston or
southeast Texas area in the immediate future?

I have my code speed up and I want to get to a test before I loose it
again.  The closest one I know of is Victoria on March 9.  I'd rather
not wait that long!

Thanks.

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Mon Feb 05 21:32:36 1996
Path: news.epix.net!uunet!in2.uu.net!nntp.coast.net!news.sprintlink.net!news.interserf.net!usenet
From: Mike Sims <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 4CX1600B Amp.
Date: Mon, 29 Jan 1996 22:58:51 -0500
Organization: Internet Services Of Fredericksburg
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: nasfred.interserf.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6a (Win95; I)

Just about finished building a 4CX1600B, 80 - 10 meter amp. using the informat
ion from the
Svetlana Specification Sheet and 4CX1600B amp. article of Marv Gonsior, W6FR,
in the Winter 1995
edition of Communications Quarterly.  Looking for suggestions, warnings, cauti
ons, etc. regarding
what I should lookout for the first time the 4CX1600B amp. is turned on or bef
ore it is turned
on.

        73s,
        Mike Sims, K4GMH


From [e-mail] Mon Feb 05 21:32:37 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!news.ifu.net!ifu
From: [e-mail] (Dean N2TNN)
Newsgroups: rec.radio.amateur.homebrew
Subject: QRP Kits
Date: 30 Jan 1996 00:30:56 GMT
Organization: ifu.net
Lines: 8
Message-ID: <4ejos0$[e-mail]>
NNTP-Posting-Host: ip62.ifu.net
X-Newsreader: News Xpress Version 1.0 Beta #4

Any comments on qrp kits?  I have constructed Ark40 and have a NorCal40 in the

box. I was just looking for any comments to help justify buying another. 30
Meters is in desperate need of my tiny qrp signal but I don't know how to get
it there.

BTW, how abt the QRP Plus???

72  Dean


From [e-mail] Mon Feb 05 21:32:38 1996
Path: news.epix.net!news.sprintlink.net!news.ecrc.de!news.space.net!news.muc.de!informatik.tu-muenchen.de!Germany.EU.net!howland.reston.ans.net!newsfeed.internetmci.com!news1.i1.net!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Baked Black Wrinkle Paint
Date: Tue, 30 Jan 1996 03:28:40 GMT
Organization: Inlink
Lines: 9
Message-ID: <4ek3jv$[e-mail]>
References: <4edu72$[e-mail]>
NNTP-Posting-Host: slip108.inlink.com
X-Newsreader: Forte Free Agent 1.0.82

Hi Paul

Both J.C. Whitney and Warshowski & Co. Automotive suppliers in Chicago
sell wrinkle finish paint in aerosols.

TTUL
Gary




From [e-mail] Mon Feb 05 21:32:39 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Swan XTAL Filter Impedance ?
Date: 30 Jan 1996 03:31:47 GMT
Organization: Hewlett-Packard
Lines: 20
Message-ID: <4ek3f3$[e-mail]>
References: <4eals2$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4eals2$[e-mail]>,
Doug Snowden <[e-mail]> wrote:
>I found an old Swan xtal filter the other day. I'd like to play around
>with it in a receiver circuit. It is a 487-024  freq = 9001.65 khz. I
>think I came from an old Swan Astro 100 transceiver. What is the in/out
>impedance ? Guess I could play until I got it matched if all else fails.
>
>Doug, N4IJ
>--
>Doug  Snowden
>[e-mail]
>

It's probably in the neighborhood of 5000 ohms, if you want a starting
point for experimenting.  They typically require a few pF. (may be negative
or positive) of shunt capacitance as well.  Be sure to have 2 adjustments
on each port, so you can do both R and C.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Mon Feb 05 21:32:40 1996
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!gatech!purdue!haven.umd.edu!news.ums.edu!crick.sura.net!thorn.cc.usm.edu!whale.st.usm.edu!tratliff
From: [e-mail] (Tina Marie Hatten Ratliff)
Newsgroups: rec.radio.amateur.homebrew
Subject: QSL Bureau in Egypt?
Date: 30 Jan 1996 07:09:51 GMT
Organization: University of Southern Mississippi
Lines: 12
Message-ID: <4ekg7v$[e-mail]>
NNTP-Posting-Host: whale.st.usm.edu
X-Newsreader: TIN [version 1.2 PL1]


I am posting this for a friend living in Egypt so please forgive me if
this is the wrong newsgroup.

My friend wants to obtain an Eyptian radio license and needs a contact
person. Does anyone have the address for the QSL bureau or the addresses
of licensed operators in Egypt.

Please respond to me at  [e-mail]

THANK YOU VERY MUCH,
JEFF RATLIFF


From [e-mail] Mon Feb 05 21:32:41 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: 82 Repeater in Kansas City
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]>
Date: Tue, 30 Jan 1996 09:24:14 GMT
Lines: 17
Xref: news.epix.net rec.radio.amateur.policy:33008 rec.radio.amateur.antenna:18907 rec.radio.amateur.equipment:24595 rec.radio.amateur.homebrew:13149 rec.radio.amateur.digital.misc:13973

In <[e-mail]> Eddie Caffray <[e-mail]> write
s:

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

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

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


From [e-mail] Mon Feb 05 21:32:42 1996
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From: [e-mail] (Mark Fellhauer)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: 82 Repeater in Kansas City/Repeater Use
Date: 30 Jan 1996 09:26:00 -0700
Organization: Primenet Services for the Internet
Lines: 43
Sender: [e-mail]
Message-ID: <4elgqo$[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]> <[e-mail]>
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[e-mail] (Rob Janssen) wrote:

>In <[e-mail]> Eddie Caffray <[e-mail]> writ
es:

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

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

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

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

It has been reported to me, by Dan Ford, Commander of the SHERRIF'S
Ham Radio Posse, that they also plan to actively engage in pursuing
people misusing radio gear in Maricopa County.  I strongly suggest
that if you plan on jamming a repeater in Central Arizona, plan on
getting caught.

Unfortunately, the ARA has had, for the 3rd time its existence, had to
remove a member, by board action, for misconduct involving repeaters.
This "gentleman" is also facing stiff legal sanctions from the FCC.

In 1995, the 3 biggest abusers of ARA repeaters WERE caught, and
several others have been identified.

73,

Mark Fellhauer
KC7BXS




From [e-mail] Mon Feb 05 21:32:44 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!ifwtech.demon.co.uk!G3SEK
From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Looking for mechanical filters.
Date: Tue, 30 Jan 1996 13:42:24 +0000
Organization: IFW Technical Services
Lines: 64
Distribution: world
Message-ID: <$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
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Xref: news.epix.net rec.radio.amateur.homebrew:13155 rec.radio.swap:56866

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

>In article <[e-mail]> Mark Mansfield <[e-mail]> writes:
>>From: Mark Mansfield <[e-mail]>
>>I'm looking for a pair of Collins (or equiv.) mechanical filters for a
>>CW receiver which I'm building. I'm planning on using one of the filters
>>in the front of the IF and using another in the "tail-ended" mode after
>>the last IF amp. The filters should be the same frequency with the tail-
>>ended filter 100 to 200 hertz wider than the first filter (this was
>>recommended in a book by Doug DeMaw although the same bandwidth should
>>work as well if the filters have the same frequency).
>
>

>Haven't used Collins filters but have used 9 MHz KVGs in this application.
>(XF9B input, XF9A output) I know there is a theoretical advantage to having
>the second filter, but I didn't note much improvement in my HB receiver. Ther
e
>can be a complication in the AGC system though. After conversation with Wes
>Haywood, I decided to move the AGC pickoff ahead of the second filter. The
>time delay through the second filter was causing severe AGC pumping. See
>KN5S's article in a recent QEX for more on this.
>
>Assuming no i-f overload and a decent product detector, you basically suffer
>no more than 3 dB extra noise at the audio amp without the second filter. Of
>course if the first filter has poor stopband rejection or there is leakage
>around it, the second filter can help.

Too much broadband IF gain can deliver enough noise power to overload
the product detector and cause unwanted (>2nd-order) intermodulation.
The effect is that additional noise becomes mixed with the signal,
degrading the SNR way beyond the expected 3dB.

This is a similar effect to the one mentioned some weeks ago in the
discussion about measuring filter performance using a broadband high-
power noise source and a spectrum analyzer. Except when limited by a
narrow bandpass filter, the total integrated noise power overloads the
analyzer so that the filter stopband fills up again with intermodulated
noise.

In an IF amplifier, even a very moderate amount of post-filter
selectivity (simple tuned circuits) is usually enough to chop down the
broadband noise from the earlier stages. This makes a big improvement to
the SNR without introducing delays which could affect the AGC. In other
words, you can have the best of both worlds without the expense of a
second mechanical or xtal filter.

Bring back IF transformers!



>
>Good luck,
>
>Wes -- N7WS
>
>>Thanks,
>>Mark
>

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


From [e-mail] Mon Feb 05 21:32:46 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!saluki-news.wham.siu.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!cdc2.cdc.net!uunet!in1.uu.net!hearye.mlb.semi.harris.com!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need MC1648P I.C.
Date: 30 Jan 1996 14:38:57 -0500
Organization: Harris Controls Division
Lines: 10
Message-ID: <4els4h$[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]

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

Doug, N4IJ [e-mail]

--
Doug  Snowden
[e-mail]



From [e-mail] Mon Feb 05 21:32:47 1996
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Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <[e-mail]>
Date: Tue, 30 Jan 1996 16:00:00 -0500
Organization: =ACE= ONLINE [phone]
Subject: Re: WD-40 vice Contact/Tu
Message-ID: <[e-mail]>
Lines: 12

GC>I've put old WWII equipment in the dishwasher. Dishwasher detergent
GC>is really harsh, but boy does it clean well. You're going to have
GC>to replace the old paper capacitors in that equipment anyway, just
GC>due to age, so that's not much of a concern. And the hot water will
GC>soften or remove wax that may be used to seal adjustable coils, but
GC>the rig will probably need an alignment anyway, so that's not a big
GC>concern either. But the dishwasher detergent can etch aluminum, and
GC>aluminum parts can come out frosted instead of shiny, so you might

Plays havoc with loudspeakers too!
---
 ■ SLMR 2.1a ■


From [e-mail] Mon Feb 05 21:32:48 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!primus.ac.net!news.serv.net!news.alt.net!news1.alt.net!news.u.washington.edu!news.uoregon.edu!chi-news.cic.net!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!lerc.nasa.gov!grybicki.lerc.nasa.gov!seryb
From: George Rybicki <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: yaesu ft101 mods?
Date: 30 Jan 1996 18:05:33 GMT
Organization: PV Branch
Lines: 4
Distribution: world
Message-ID: <4elmld$[e-mail]>
NNTP-Posting-Host: grybicki.lerc.nasa.gov
X-Newsreader: Nuntius Version 1.2
X-XXMessage-ID: <[e-mail]>
X-XXDate: Wed, 31 Jan 1996 18:09:03 GMT

Does anyone know  about the WARC band mods for the FT101, I found the 30
meter
mod and a reference to the 12 meter mod.  What is the 12 meter mod? how
is it done? thanks in advance for any help. 73 George


From [e-mail] Mon Feb 05 21:32:49 1996
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From: [e-mail] (Ignacy Misztal)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Looking for mechanical filters.
Date: 30 Jan 1996 18:32:26 GMT
Organization: University of Georgia
Lines: 23
Distribution: world
Message-ID: <4elo7q$[e-mail]>
References: <[e-mail]> <[e-mail]> <$[e-mail]>
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NNTP-Posting-Host: num.ads.uga.edu
X-Newsreader: IBM NewsReader/2 v1.00
Xref: news.epix.net rec.radio.amateur.homebrew:13141 rec.radio.swap:56824

In <$[e-mail]>, "Ian White, G3SEK" <G3SEK@ifwtech.d
emon.co.uk> writes:
>
>In an IF amplifier, even a very moderate amount of post-filter
>selectivity (simple tuned circuits) is usually enough to chop down the
>broadband noise from the earlier stages. This makes a big improvement to
>the SNR without introducing delays which could affect the AGC. In other
>words, you can have the best of both worlds without the expense of a
>second mechanical or xtal filter.
>

The second filter eliminates noise from the other sideband (thus
the 3db improvement) and eliminates the hiss. One can see a diffrence
it makes when one compares CW reception with 1st IF with 2nd IF
filters.  Disregarding differences in slopes, the 2nd IF filter cuts
the hiss and makes the signal sound more "professional".  One can have
a similar effect with a DSP, but good DSPs are not cheaper than
the 2nd IF filter and the 3db advanatage is lost.

Ignacy Misztal              Ham radio: NO9E, SP8FWB
E-mail: [e-mail]
University Of Georgia, 203 L-P Bldg., Athens, GA 30602
tel. [phone]



From [e-mail] Mon Feb 05 21:32:50 1996
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!amden.demon.co.uk
From: Keith Beddoe <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP Interference
Date: Tue, 30 Jan 96 21:11:45 GMT
Lines: 44
Message-ID: <[e-mail]>
References: <4el9nf$[e-mail]>
X-NNTP-Posting-Host: amden.demon.co.uk
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X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!amden.demon.co.uk

George ([e-mail]) wrote:

: I'm trying to use my AEAfax to receive FAX/RTTY.  But My computer
: generates too much interfercne.  I know its not the

: electrical system ground.  I'm thinking of running a ground wire from
: second floor wind and driving a rod in the ground. Will this help?  I
: know nothing about grounding.

I had similar problems some years back using a homebrew computer. What
I did was to use a noise-cancelling circuit.

What I did was to erect a short aerial next to the offending equipment
and connect this to one end of a loop. Then connect the main aerial to
the other. By using a potential divider and variable capacitor I could
use the noise picked up on the short aerial to cancel out the noise
being picked up on the main aerial.

       ---|-----########----------
short     |       1:1              main
aerial    |     ########           aerial
          |     |      |
          |     |      |
          |       RX
 1000 ohm R  C
          R  C
          R  C  200pf    Variable R and C in parallel
          |
          |
          Ground or nearest copper water pipe!

I hope the  'diagram' is clear.
By careful adjustment of R and C it was possible to "phase" out most of
the noise. The circuit did need adjustment if large changes in frequency
were made.
This circuit was also helpful in reducing TV Timebase interference on
160m.

Hope this is of interest.

73
Keith   G3YOM    Southampton UK



From [e-mail] Mon Feb 05 21:32:51 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Alex948739)
Newsgroups: rec.radio.amateur.homebrew
Subject: HELP WITH SELECTING FIRST HANHELD HAM
Date: 30 Jan 1996 21:15:15 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <4emjbj$[e-mail]>
Reply-To: [e-mail] (Alex948739)
NNTP-Posting-Host: newsbf02.mail.aol.com

HI, I JUST GOT MY LICENCE AND I WANT TO BUY A HANDHELD HAM RADIO BECAUSE I
AM ALWAYS TRAVELING. CAN ANYONE HAVE ANY SUGGESTIONS? I WANT IT TO BE
MODIFYABLE AND I WANT TO TALK TO PEOPLE IN RUSSIA. PLEASE INCLUDE THE
PRICE ALONG WITH THE MODEL NUMBERS.
                                                            THANK YOU


From [e-mail] Mon Feb 05 21:32:52 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr1ip8.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Looking for mechanical filters.
Date: Tue, 30 Jan 1996 22:01:32 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 42
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <$[e-mail]> <4elo7q$[e-mail]>
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X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]
Xref: news.epix.net rec.radio.amateur.homebrew:13036 rec.radio.swap:56382

In article <4elo7q$[e-mail]> [e-mail] (Ignacy Miszt
al) writes:
>From: [e-mail] (Ignacy Misztal)
>Subject: Re: Looking for mechanical filters.
>Date: 30 Jan 1996 18:32:26 GMT

>In <$[e-mail]>, "Ian White, G3SEK"
><[e-mail]> writes:
>>
>>In an IF amplifier, even a very moderate amount of post-filter
>>selectivity (simple tuned circuits) is usually enough to chop down the
>>broadband noise from the earlier stages. This makes a big improvement to
>>the SNR without introducing delays which could affect the AGC. In other
>>words, you can have the best of both worlds without the expense of a
>>second mechanical or xtal filter.
>>

>The second filter eliminates noise from the other sideband (thus
>the 3db improvement) and eliminates the hiss. One can see a diffrence
>it makes when one compares CW reception with 1st IF with 2nd IF
>filters.  Disregarding differences in slopes, the 2nd IF filter cuts
>the hiss and makes the signal sound more "professional".  One can have
>a similar effect with a DSP, but good DSPs are not cheaper than
>the 2nd IF filter and the 3db advanatage is lost.

I agree with Ian. In my previous post, I neglected to mention the
assumption that the i-f strip included some moderate tuned-circuit
selectivity. As to the reduction of hiss (over and above the image sideband
noise) I fail to see an advantage to the second filter, give my earlier
assumptions. The product detector is just another mixer which can be followed
with an audio BP filter (doesn't have to be DSP) to achieve the same BW
reduction as the second mechanical or crystal filter. In other words, except
for the fold over of the image sideband, you can't tell the difference.

As to audio DSP, I must confess to being underwhelmed with my DSP-9. I
consistently find that I'm using the 1.8 KHz BW even on EME strength CW. A
trained ear is still a lot better (IMHO) than a box full of electronics. In
the absence of QRM, I just don't see the necessity for "brick-wall" filters. A

couple of synchronously-tuned passive LC circuits and a good pair of hi-fi
phones work fine. No power supply, no hum, no hiss, no crossover distortion,
no cost:-)

Wes -- N7WS


From [e-mail] Mon Feb 05 21:32:54 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: PTO Temperature Compensation
Date: Tue, 30 Jan 96 22:30:26 GMT
Lines: 59
Message-ID: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I have four identical PTO's in solid-state rigs that I've been trying
to stabilize, with only limited success.  Maybe someone with more
experience in this area can help me out.

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

The problem I have with the PTO's is that they all drift upward as the
temperature rises.  Following a ten or fifteen minute warmup, I
tracked the drift over a five or six hour period as the chassis of the
rig(s) gradually warmed up.  The first PTO (which probably had a bad
component) would drift about 1.6 KHz.  The second PTO drifted about
800 Hz, and the last two units both drifted about 300-400 Hz.

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

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

One of the things that seems odd about this has to do with the
capacitors I tried.  First, as I gradually replaced the N220 and N330
capacitors with polystyrene units, the upward drift diminished.  This
has made me think that the PTO's were, in fact, over-compensated.
Now, it's my understanding that polystyrene capacitors also exhibit a
negative temperature coefficient, and that the coefficient is not
particularly well controlled.  Mallory states pretty wide variations
for their capacitors, ranging from about -50 ppm to about -175 ppm.

So, thinking that the PTO's were still over-compensated, I went back
and replaced about 100 pf in one of them with NPO discs.  However,
rather than reducing the drift further, or causing a downward drift,
this merely caused the initial extreme upward drift to return.

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

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

73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:32:55 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!guardian.up.edu!gateway.sequent.com!uunet!in1.uu.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Shielded Capacitors
Date: Tue, 30 Jan 96 22:31:03 GMT
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I'm working on a problem that requires small, shielded, PC-mount
bypass caps.  I need values around 0.1 and 0.05 uf, and the capacitors
need to be constructed in such a way that when the "negative" lead is
grounded, the inner case of the cap will prevent the "hot" side from
radiating.

Can someone tell me if any of the inexpensive monolithic or tantalum
capacitors are constructed this way?  If so, will 0.1 uf tantalums
provide satisfactory bypassing at 9 MHz?  Any suggestions for other
(affordable) types that will do the job?

73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:32:56 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Swan XTAL Filter Impedance ?
Date: Tue, 30 Jan 96 22:44:20 GMT
Lines: 19
Message-ID: <[e-mail]>
References: <4eals2$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Doug Snowden) wrote:
>I found an old Swan xtal filter the other day. I'd like to play around
>with it in a receiver circuit. It is a 487-024  freq = 9001.65 khz. I
>think I came from an old Swan Astro 100 transceiver. What is the in/out
>impedance ? Guess I could play until I got it matched if all else fails.

That's a good 8-pole, 2.4 KHz filter.  It was used in quite a few
models of Swan and Swan-related gear, including the Astro 103 that
I own.  I don't need a new filter at the moment, but could I convince
you not to play with that particular component?  They're not made
anymore and someday, someone might have to trash their rig for lack
of a replacement.

Just my $.02.  :)

73,
Jack  WB3U



From [e-mail] Mon Feb 05 21:32:57 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX1600B Amp.
Date: Tue, 30 Jan 96 22:47:00 GMT
Lines: 8
Message-ID: <[e-mail]>
References: <[e-mail]>
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   Mike Sims <[e-mail]> wrote:

>Looking for suggestions, warnings, cautions, etc. regarding
>what I should lookout for the first time the 4CX1600B amp. is
>turned on

Don't look into the output connector.  :)


From [e-mail] Mon Feb 05 21:32:58 1996
Path: news.epix.net!news.sprintlink.net!news.comm.net!imci3!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Does bubble bath ruin paper caps?
Date: 31 Jan 1996 01:44:19 GMT
Organization: University of Colorado, Boulder
Lines: 31
Message-ID: <4emhhj$[e-mail]>
References: <4e6tbm$[e-mail]> <4e9a5d$[e-mail]> <[e-mail]> <4eiks1$[e-mail]>
NNTP-Posting-Host: spot.colorado.edu
Summary: Paper caps are _already_ ruined, probably.
Keywords: Paper caps - yuck!

I've never (intentionally!) washed out electronic equipment with soapy
water, but the question whether this hoplessly ruins paper caps has arisen.

I say they're probably already ruined, even before getting washed!
(Even if the thing they're in works just fine.)

I discovered two interesting things about paper caps.  First, when posed
with 30 volts, many had measurable leakage currents, implying leakage
resistances in only the few hundred megohm range, making them totally
unsuitable for some applications, and second, that some charged and
discharged in a visco-elastic sort of way, in that the charging current
only slowly went to zero with continued application of constant charging
voltage, and then when the thing was disconnected from the charging voltage
and shorted out, the voltage shot back up again in a rebound.  The worst
offenders were all paper caps, and some rebounded back up 7 or 8 volts when
offered 30 volts and then shorted momentarily.

This isn't a hazard at the 30 volts I tested them at, but what about at the
400 or 600 volts they're rated for?  They'd rebound some 100 volts - no
good! I discarded them. Some of them rebounded back to 2 volts after being
shorted for the second time, and were still at 2 V two or three days later.

Ceramic caps had no measurable leakage current by my simple VOM, and hardly
100 mV of rebound voltage at most.  They're smaller too, and probably have
lower ESR as well.  0.047 uF @ 2 kV discs are $0.15 each at the local store.

I see no need to worry about the detrimental effects of soap suds on paper
caps; I'd worry about them as they are!

Bruce Tiemann
N6URH


From [e-mail] Mon Feb 05 21:33:00 1996
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: PTO Temperature Compensation
Date: Wed, 31 Jan 96 02:11:07 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 58
Distribution: world
Message-ID: <4enu4k$[e-mail]>
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X-Newsreader: News Xpress Version 1.0 Beta #4

I have four identical PTO's in solid-state rigs that I've been trying
to stabilize, with only limited success.  Maybe someone with more
experience in this area can help me with this.

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

The problem I have with the PTO's is that they all drift upward as the
temperature rises.  Following a ten or fifteen minute warmup, I
tracked the drift over a five or six hour period as the chassis of the
rig(s) gradually warmed up.  The first PTO (which probably had a bad
component) would drift about 1.6 KHz.  The second PTO drifted about
800 Hz, and the last two units both drifted about 300-400 Hz.

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

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

One of the things that seems odd about this has to do with the
capacitors I tried.  First, as I gradually replaced the N220 and N330
capacitors with polystyrene units, the upward drift diminished.  This
has made me think that the PTO's were, in fact, over-compensated.
Now, it's my understanding that polystyrene capacitors also exhibit a
negative temperature coefficient, and that the coefficient is not
particularly well controlled.  Mallory states pretty wide variations
for their capacitors, ranging from about -50 ppm to about -175 ppm.

So, thinking that the PTO's were still over-compensated, I went back
and replaced about 100 pf in one of them with NPO discs.  However,
rather than reducing the drift further, or causing a downward drift,
this merely caused the initial extreme upward drift to return.

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

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

73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:33:01 1996
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Shielded Capacitors
Date: Wed, 31 Jan 96 02:12:46 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 13
Distribution: world
Message-ID: <4enu7k$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I'm working on a problem that requires small, shielded, PC-mount
bypass caps.  I need values around 0.1 and 0.05 uf and the capacitors
need to be constructed in such a way that when the "negative" lead is
grounded, the inner case of the cap will prevent the "hot" side from
radiating.

Can someone tell me if any of the inexpensive monolithic or tantalum
capacitors are constructed this way?  If so, will 0.1 uf tantalums
provide satisfactory bypassing at 9 MHz?  Any suggestions for other
(affordable) types that will do the job?

73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:33:02 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tuner Spray!!
Date: 31 Jan 1996 02:15:17 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 25
Sender: [e-mail]
Message-ID: <4en4u5$[e-mail]>
References: <4eiks1$[e-mail]>
X-Newsreader: AOL Offline Reader

In article <4eiks1$[e-mail]>, James Garland
<[e-mail]> writes:

>I've never had the nerve to try this technique.  I just can't bring
>myself to dunk, say, my Central Electronics 100V in the bathtub and let
>it soak. I'd be interested in knowing others' experience with this
>cleaning method. Is it really necessary to remove the transformers? What
>happens to the cardboard sleeves of IF transformers? Does it hopeless
>ruin paper capacitors? Are there other precautions to take?
>
>Jim W8ZR

A bubble bath may be the only way to clean the signal up an old
boatanchor! (Just kidding Jim, I couldn't resist)

Seriously. I use a quick soapy water bath, a water hose bath, then a
distilled water bath, then I use an airhose to blow em out, then I let the
rig dry under a heatlamp for a few days, and last I put a light coating of
WD-40 in the right spots. I did that to a Ranger, DX-100 and an Apache.

My rigs now look very clean and still work, only the signals are dirty.

73 Tom




From [e-mail] Mon Feb 05 21:33:03 1996
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Swan XTAL Filter Impedance ?
Date: Wed, 31 Jan 96 02:16:50 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 21
Distribution: world
Message-ID: <4enuf9$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Doug Snowden) wrote:
>I found an old Swan xtal filter the other day. I'd like to play
>around with it in a receiver circuit. It is a 487-024  freq = 9001.65
>khz. I think I came from an old Swan Astro 100 transceiver. What is
>the in/out impedance ? Guess I could play until I got it matched if
>all else fails.

That's a good 8-pole, 2.4 KHz filter.  It was used in quite a few
models of Swan and Swan-related gear, including the Astro 103 that
I own.  I don't need a new filter at the moment, but could I convince
you not to play with that particular component?  They're not made
anymore and someday, someone will probably have to trash their rig for
lack of a replacement.

On the other hand, if you're really determined to do this, send me
some e-mail.  I'll outline the details of the circuitry surrounding
that filter in the 103.  It will undoubtedly save you lots of cut and
try.

73,
Jack  WB3U


From [e-mail] Mon Feb 05 21:33:04 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jim Storm)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP Interference
Date: Wed, 31 Jan 1996 03:54:44 GMT
Organization: ix.netcom.com
Lines: 21
Message-ID: <4emp65$[e-mail]>
References: <4el9nf$[e-mail]>
NNTP-Posting-Host: ix-smx-ca3-11.ix.netcom.com
X-NETCOM-Date: Tue Jan 30  7:54:46 PM PST 1996
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (George) wrote:

>I'm trying to use my AEAfax to receive FAX/RTTY.  But My computer
>generates too much interfercne.  I know its not the
>monitor,mouse,keyboard,&modem.  I've removed all and powered up CPU and
>still get noise.  I've taken CPU to another room (on another electrical
>circuit) and still get a +20dB noise level from CPU.  Now I'm on the
>second story of a townhouse and my radios are only grounded to the
>electrical system ground.  I'm thinking of running a ground wire from
>second floor wind and driving a rod in the ground. Will this help?  I
>know nothing about grounding.
>Tnx
>George

You might want to try the JPS ANC-4. Unlike other DSP's, it goes in
the antenna lead and is designed specifically for local noise.
According to what I've read in the newsgroups, it's remarkably
effective. It was tested in the latest issue of QST.

                      73, Jim WB6LWS



From [e-mail] Mon Feb 05 21:33:06 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.exodus.net!aimnet.com!ns2.mainstreet.net!sloth.swcp.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP WITH SELECTING FIRST HANHELD HAM
Date: 31 Jan 1996 04:08:52 GMT
Organization: Los Alamos National Laboratory
Lines: 39
Message-ID: <4emq0k$[e-mail]>
References: <4emjbj$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
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To: [e-mail]


I'm sure you're joking or just fishing for flames, but you
really CAN "work Russia" with a handheld radio.  If you happen
to live in south Florida or Northern New Mexico or Southern
California or the Wasatch Front in Utah or other of the several
areas having publicly available crossband remote base /
repeater systems you can get user touchtone command lists from
the owners/sysops and work DX via HF remote base from your
walkie-talkie.  You'll need most likely a dual bander with PL
memory functions to enjoy both local area contacts with 2
meters and the DX and other fun stuff available through your
nearest 220 or 440 remote base system.  You should ask around
your area before buying.  Rarely are 2 meter repeaters set up
for such exotic remote base functions (to be legal they have to
be controlled via 220 MHZ or higher frequencies) but I know in
South Florida at least one system is set up so that users can
talk out on HF SSB with a 2 meter FM radio only, no UHF
required.  I've talked to them several times with MY
handi-talkie using MY remote HF base system from here in NM.
Keep in mind, now, that depending on your license, you will
need to have a control operator on duty for you to legally talk
through a remote base from your VHF/UHF rig on a particular HF
frequency.  You will not be able to just dial up 20 meters, for
example, unless you have a general or higher class license.  A
properly licensed control op can dial it for you and let you
talk under his "remote supervision", so it isn't normally
something you can just do on the spur of the moment without
the proper license but it's still fun.... and gets even more
fun as you upgrade so you can also become a control op.
If you by chance happen to live in northern NM I'd be happy to
email you a list of our system's touchtone users commands.
|-------------------------------------------------------|
|Jim Devenport  WB5AOX                                  |
|All Standard Disclaimers Disclaimed                    |
|My views rarely (if ever) reflect those of my employers|
|HTTP://nis-www.lanl.gov/~jdport/                       |
|-------------------------------------------------------|




From [e-mail] Mon Feb 05 21:33:07 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!news.gate.net!bcfreenet.seflin.lib.fl.us!bcfreenet!z007298b
From: [e-mail] (Eliot Fenton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Stereo xmitter chip?
Date: 31 Jan 1996 05:08:30 GMT
Organization: SEFLIN Free-Net - Broward
Lines: 18
Message-ID: <4emtge$[e-mail]>
NNTP-Posting-Host: bcfreenet.seflin.lib.fl.us
Keywords: stereo transmitter
X-Newsreader: TIN [version 1.2 PL2]

Pardon my lack of stereo fundamentals...............

But does anyone know of a chip manufactured by Motorola, National, etc.
that will take left and right stereo audio outputs (from say a C.D.
player) and produce an RF carrier suitable for reception and demod. on any
stereo receiver?  If not a single chip, does anyone know of any articles
written on how to build such a thing?  I would think the hardest part
would be generating the subcarrier (a PLL?), but I would like to see what
other people have come up with.

Regards,

--

Eliot Fenton
[e-mail]
Compuserve: [e-mail]



From [e-mail] Mon Feb 05 21:33:08 1996
Path: news.epix.net!news.sprintlink.net!cyberspace.com!news.uoregon.edu!newsxfer.itd.umich.edu!news2.acs.oakland.edu!news.tacom.army.mil!ulowell.uml.edu!wang!news.kei.com!newsfeed.internetmci.com!primus.ac.net!news.cais.net!news.sfo.com!news.zeitgeist.net!hilbert.dnai.com!usenet
From: Stan Jacox <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Source of crystals?
Date: 31 Jan 1996 05:59:47 GMT
Organization: Studio Maintenance Center
Lines: 10
Message-ID: <4en0gj$[e-mail]>
NNTP-Posting-Host: isdn27-10.dnai.com
Mime-Version: 1.0
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X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

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

Stan Jacox  KM6XZ
http://www.studio-maint.com/~stanj



From [e-mail] Mon Feb 05 21:33:09 1996
Path: news.epix.net!news.sprintlink.net!siemens!news.ecn.bgu.edu!ts117.eiu.bgu.edu!cgfrj
From: [e-mail] (Rick Jones)
Newsgroups: rec.radio.amateur.homebrew
Subject: trx designs (vac tube or transistor) help / beginner
Date: Wed, 31 Jan 1996 06:41:00 +1000
Organization: Eastern Illinois University
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: ts117.eiu.bgu.edu
Keywords: build tube transistor
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

  I'm interested in possibly getting started in ham .. but I'd like to build
my own set.  Unfortunately, the only resources I've found to this regard is an

old 20W transmitter vac tube design.. and a corresponding reciever.   As I am
looking up info.. I still have a few questions.  Which is better a vac tube or

transistor design for performance?  Are there any more current designs for
someone wanting to build their own system (simple at first, but able to be
improved upon)?


From [e-mail] Mon Feb 05 21:33:11 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!ifwtech.demon.co.uk!G3SEK
From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Re: Looking for mechanical filters.
Date: Wed, 31 Jan 1996 07:59:18 +0000
Organization: IFW Technical Services
Lines: 47
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
 <$[e-mail]> <4elo7q$[e-mail]>
 <[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
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MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL>
Xref: news.epix.net rec.radio.amateur.homebrew:13078 rec.radio.swap:56565

In article <[e-mail]>, Wes Stewart wrote:
>In article <4elo7q$[e-mail]> [e-mail] (Ignacy
>Misztal) writes:
>

>>The second filter eliminates noise from the other sideband (thus
>>the 3db improvement) and eliminates the hiss. One can see a diffrence
>>it makes when one compares CW reception with 1st IF with 2nd IF
>>filters.  Disregarding differences in slopes, the 2nd IF filter cuts
>>the hiss and makes the signal sound more "professional".  One can have
>>a similar effect with a DSP, but good DSPs are not cheaper than
>>the 2nd IF filter and the 3db advanatage is lost.

The 3dB advantage isd in *IF* signal-to-noise ratio only - but the IF
noise should always be overridden by noise received from the antenna and
further up the RX chain. Unless the product detector is being overloaded
by broadband IF noise, you probably wouldn't hear the difference.

Wes again: *WARNING - TOPIC DRIFT :-)

>As to audio DSP, I must confess to being underwhelmed with my DSP-9. I
>consistently find that I'm using the 1.8 KHz BW even on EME strength CW. A
>trained ear is still a lot better (IMHO) than a box full of electronics. In
>the absence of QRM, I just don't see the necessity for "brick-wall" filters.
A
>couple of synchronously-tuned passive LC circuits and a good pair of hi-fi
>phones work fine. No power supply, no hum, no hiss, no crossover distortion,
>no cost:-)

I love my DSP-9+ for EME (same filters as the DSP-9). Like Wes, I don't
find the brick-wall characteristic very useful when the application is
detecting weak signals rather than rejecting QRM. But the suppression of
noise on unwanted frequencies away from the signal tends to aid this
pair of trained ears. By concentrating harder I could probably switch
out the DSP filter and continue to copy in 1.8kHz, but it would break my
brain to do that for a whole pass of the moon.

Different folks, different filters - always has been.

By the way, in the latest 432 and Above EME newsletter, HB9BBD gives a
good preliminary report for the TS-870 on very weak signals.


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


From [e-mail] Mon Feb 05 21:33:12 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Dec QEX "construction article??"
Date: Wed, 31 Jan 96 09:33:59 PDT
Organization: Northwest Nexus Inc.
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: blv-pm11-ip30.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


Hi all, I just read my December QEX.  Is anybody else out there
bothered by whats happening at ARRL?  The lead article sounded
great "A Microprocessor Controlled Multiband Transceiver", but
turned out to be of very, VERY limited value.  I thought QEX was
supposed to be an experimenters magazine - where people
regularly build and modify equipment to try out new things.
Just how does a description of building a bunch of kits and
tying them together with a microprocessor controlled DDS board
that has to be purchased from the author (or totally redesigned
from the ground up) end up in QEX??

I have no problem with the author selling kits, but only after
fully disclosing the design.  What if I want to add some
features, or some additional control outputs to drive some
different or additional RF boards?  If this was just all about
building kits, then I guess that Heath would still be in
business.  I subscribed to QEX for the exchange of ideas and
more technical design information than appears in QST; but this
article doesn't do it for me.

What do you think?? Either way, if you're a QEX subscriber, let
QEX (at [e-mail]) or the editor Jon Bloom (at
[e-mail]) know how you feel.  Maybe I'm the only one
upset by this diversion into product reviews.

73 de KI7RH (Jay Wicklund)



From [e-mail] Mon Feb 05 21:33:15 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WD-40 vice Contact/Tu
Date: 31 Jan 1996 10:33:58 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 25
Sender: [e-mail]
Message-ID: <4eo257$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail] (Brian
Carling) writes:

>I used WD-40 to fix my 1957 Chevrolet when the alternator went bad.

A long time ago I took a girl to the drive-in movies in my dad's 57
Ford.....

>I had been driving down the highway when the ignition light came on and

A few weeks later I developed a problem....

>smoke poured out of the hood. There was a very bad burning smell.

.....almost like you describe here......

>All I did was dip the alternator in WD40 and blowit out a few times and

.....I did something similar.....

>it was as good as new.

.....you said it. WD-40 fixes ANYTHING. It's just what the doctor ordered!

;-)


From [e-mail] Mon Feb 05 21:33:16 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!rain.fr!world-net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: COIL WINDING PROGRAM  (freeware Win95 only)
Date: Wed, 31 Jan 1996 12:24:55 GMT
Organization: World-Net information exchange, Internet provider.
Lines: 12
Message-ID: <4ennab$[e-mail]>
References: <4eeig5$[e-mail]>
NNTP-Posting-Host: client114.sct.fr
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:

>  Coil Winding Program for Windows95   CBVSR1.ZIP

Hi,
Look for same freeware but for windows 3.1 or DOS.
Any pointers ?

Have
a nice                    [e-mail]
Day



From [e-mail] Mon Feb 05 21:33:17 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Shielded Capacitors
Date: 31 Jan 1996 12:38:46 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 33
Sender: [e-mail]
Message-ID: <4eo9f6$[e-mail]>
References: <4enu7k$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4enu7k$[e-mail]>,
[e-mail] (WB3U) writes:

>I'm working on a problem that requires small, shielded, PC-mount
>bypass caps.  I need values around 0.1 and 0.05 uf and the capacitors
>need to be constructed in such a way that when the "negative" lead is
>grounded, the inner case of the cap will prevent the "hot" side from
>radiating.
>
>Can someone tell me if any of the inexpensive monolithic or tantalum
>capacitors are constructed this way?  If so, will 0.1 uf tantalums
>provide satisfactory bypassing at 9 MHz?  Any suggestions for other
>(affordable) types that will do the job?
>
>73,
>Jack  WB3U

Hi Jack,
The cap behaves like a very small transmission line. The "shield" does
nothing if it doesn't carry an equal and opposite current. Since that an
impossible accomplishment with a two terminal component, the only solution
is to keep the leads and component very short.

The biggest reduction in stray coupling or radiation would come from using
a densely packaged cap, like a multi-layer chip.

It makes almost no difference if the ground foil is on the outside or
inside of the component. The exception would be if the reactance of the
bypass capacitor is so high compared to the circuit impedance that almost
no current flows through the cap. But in that case it would be a poor
bypass anyway! Catch 22!

73 Tom


From [e-mail] Mon Feb 05 21:33:18 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: Wed, 31 Jan 1996 15:29:11 -0800
Organization: Call America Internet Services  [phone]
Lines: 29
Message-ID: <[e-mail]>
References: <4emtge$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4emtge$[e-mail]>

Eliot, there was an article in Radio Electronics some fifteen years ago
titled something like "An FM Stereo Signal Generator"  It used three or
so common chips and a 19 KHz oscillator, which of course, was doubled and
run through a 1596 balanced modulator to form the left minus right 38 KHz
signal.  I wish I could be more specific but that is a start, even if
complete modulator chips are not available.  Cliff Buttschardt  W6HDO

On 31 Jan 1996, Eliot Fenton wrote:

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


From [e-mail] Mon Feb 05 21:33:19 1996
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From: [e-mail] (Rich Griffiths)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Shielded Capacitors
Date: 31 Jan 1996 16:03:50 GMT
Organization: CyberComm Online Services
Lines: 16
Distribution: world
Message-ID: <4eo3t6$[e-mail]>
References: <4enu7k$[e-mail]>
NNTP-Posting-Host: raven.cybercomm.net
X-Newsreader: TIN [version 1.2 PL2]

WB3U ([e-mail]) wrote:
: I'm working on a problem that requires small, shielded, PC-mount
: bypass caps.  I need values around 0.1 and 0.05 uf and the capacitors
: need to be constructed in such a way that when the "negative" lead is
: grounded, the inner case of the cap will prevent the "hot" side from
: radiating.

Feed-through caps fit your physical description, if you can tolerate have
an end sticking through the other side of the board.  I don't know about
finding values as big as 0.1, though.

============================================================
Rich Griffiths                     [e-mail]
Red Bank, New Jersey               W2RG
Monmouth County  FN20wi



From [e-mail] Mon Feb 05 21:33:21 1996
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From: [e-mail] (Bruce M. Marshall)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.scanner
Subject: need 10 to 150 khz FM demodulator
Date: 31 Jan 1996 16:29:31 -0500
Organization: Tallahassee Free-Net
Lines: 12
Message-ID: <4eomvr$[e-mail]>
NNTP-Posting-Host: fn3.freenet.tlh.fl.us
Xref: news.epix.net rec.radio.amateur.homebrew:13049 rec.radio.scanner:44773

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

Bruce
--
Bruce M. Marshall  [e-mail]  voice 423 481 0990  fax [phone]


From [e-mail] Mon Feb 05 21:33:23 1996
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From: [e-mail] (JENNA DESIGN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: COIL WINDING PROGRAM  (freeware Win95 only)
Date: 31 Jan 1996 17:20:23 GMT
Organization: QRP Central
Lines: 67
Message-ID: <4eo8cn$[e-mail]>
References: <4eeig5$[e-mail]> <4ennab$[e-mail]>
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In article <4ennab$[e-mail]>, [e-mail] says...
>
>[e-mail] wrote:
>
>>  Coil Winding Program for Windows95   CBVSR1.ZIP
>
>Hi,
>Look for same freeware but for windows 3.1 or DOS.
>Any pointers ?
>
>Have
>a nice                    [e-mail]
>Day
>
CBVSR1 was only done for Win 95 only as we only do 32-bit
programming now.
However, we released another 16-bit app called QRP HomeBuilder that runs on
Windows 3.1 in the spring of 1995.
QRPHB1 is exclusively for homebrewers and would be of no use to
"non-building" HAMS.   It is freeware.

same sites  (SimTel)  -  ftp.coast.net  or   oak.oakland.edu     etc
path = Simtel/win3/hamradio/qrphb1.zip

This app is rather banal looking. It has no toolbar, statusbar or fancy graphi
cs,
but we have had a lot of good comments regarding it's code.
It has a module called CoilBuilder, which is the father to the new 32-bit
coil program we just released.

NOTES FOR QRP HOMEBUILDER1:

There is a "hidden" bitmap schematic. Access it by clicking on the picture of
the 3 element
low-pass filter in the SYSTEM Menu.  This is a previously unpublished schemati
c given to
us by Wes HayWard.

Many users have e-mailed us , stating  they want to to PRINT results screens.
Since QRPHB1 has no printing capabilities, you have to do it in a round about
method.

<< METHOD >>
When you have a results screen displayed press the ALT and the PRINTSCREEN key
s
simultaneously.  This will capture the screen to the Windows Clipboard.
Exit or minimize QRP HomeBuilder.

Now, open  the Windows PaintBrush program and from the Menu select EDIT and th
en PASTE.
You should have a bitmapped copy of your results screen present.
Then select the PRINT menu item.  After printing,  delete or do-not-save the b
mp image.
Although this method is crude, it does work.  If you have a third party screen
-capture
program you can always use it, otherwise the method described works fine.

There is a statement in QRPHB1 stating we will not post release notices of our

QRP HomeBuilder series in the UseNet Newsgroups.
We thought about it and have "appended our policy" .  We will only post  FREEW
ARE
program releases to the News Groups.  It is our firm's belief that commercial
interests
of any nature for financial gain do not belong in the UseNet Newsgroups.

We presently,  have no connection to the Amateur Radio industry whatsoever.  T
he
QRP HomeBuilder releases are released as freeware to promote electronics as a
hobby and to give us something "fun" to work on;  that is our reward.

Thanks    Rod and Todly
Jenna Design








From [e-mail] Mon Feb 05 21:33:24 1996
Path: news.epix.net!news.sprintlink.net!news.interstat.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #28
Date: 31 Jan 96 19:37:33 GMT
Organization: ucsd usenet gateway
Lines: 4
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

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

KC5RBM.



From [e-mail] Mon Feb 05 21:33:25 1996
Path: news.epix.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Increasing the Power of the QST Antenna Tuner
Message-ID: <[e-mail]>
From: Bill Harwood <[e-mail]>
Date: Wed, 31 Jan 1996 19:53:17 GMT
Sender: [e-mail] (NAWS news admin)
References: <Pine.BSD/[e-mail]>
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That is the solution that SGC uses in the SGC-230.  It has a metal box
cover over the digital part and a groundplane in the circuit board.


Good Luck

  \------------------------------------------------------/
   \  Bill Harwood           U play it, I'll dance it   /
    \ AB6DY                         or                 /
     \                      I'll play it, U dance it  /
      \----------------------------------------------/





From [e-mail] Mon Feb 05 21:33:26 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.ais.net!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!drm6!drm6
From: [e-mail] (Drew R. McGhee)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Stereo xmitter chip?
Date: Wed, 31 Jan 1996 21:11:57 GMT
Organization: CAC
Lines: 17
Message-ID: <[e-mail]>
References: <4emtge$[e-mail]>
NNTP-Posting-Host: zag.aa.psu.edu
Keywords: stereo transmitter
X-Authinfo-User: [e-mail]
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

>But does anyone know of a chip manufactured by Motorola, National, etc.
>that will take left and right stereo audio outputs (from say a C.D.
>player) and produce an RF carrier suitable for reception and demod. on any
>stereo receiver?  If not a single chip, does anyone know of any articles
>written on how to build such a thing?  I would think the hardest part
>would be generating the subcarrier (a PLL?), but I would like to see what
>other people have come up with.

Greetings to Eliot and the group,

There is a chip that does what you want. Sorry, can't think of the
manufacturer. Ramsey sells two complete kits that uses it and does what you
want. I've seen the chip sold separatly but can't find a listing in a catalog
just for the chip at the present time.

Drew R. McGhee, KA3EJV
Altoona, PA


From [e-mail] Mon Feb 05 21:33:27 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Stereo xmitter chip?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4emtge$[e-mail]>
Date: Wed, 31 Jan 1996 21:24:33 GMT
Lines: 25
Sender: [e-mail]

in <4emtge$[e-mail]>, Eliot Fenton wrote:
: But does anyone know of a chip manufactured by Motorola, National, etc.
: that will take left and right stereo audio outputs (from say a C.D.
: player) and produce an RF carrier suitable for reception and demod. on any
: stereo receiver?

A Japanese company has a single chip stereo transmitter, the Rohm Ba1404.

For an example, see a construction article in Radio-Electronics magazine
for July 1992 or one for the Ramsey FM-10 in Popular Electronics (date
unknown, but more recent).  A scanned version of the spec sheet is somewhere
in ftp://dg-rtp.dg.com/fm10/archives/ .

Unless you want to deal with a fairly quirky chip, you can get a
preassembled stereo to RF converter at your local discount store for
about $20 in the form of the FX Wave Fx-100.  Hanging on the pegboard in
the audio department.  (I use one hooked to my VCR for wireless
headphones.)  It's just LC tuned, but seems stable enough.  The main
chip has the label sanded off.  It doesn't have enough pins to be a
BA1404, but I suspect it is a related chip.  I hear Rohm makes a stero
multiplexer chip without the transmitter section.  The FX wave has a
seperate 4 transistor RF section.

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



From [e-mail] Mon Feb 05 21:33:28 1996
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From: [e-mail] (Rand Gray)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Dec QEX "construction article??"
Date: 31 Jan 1996 22:21:38 GMT
Organization: Motorola Corp., Austin, Texas
Lines: 20
Distribution: world
Message-ID: <4eoq1i$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: chianti.sps.mot.com

Jay Wicklund made some comments about our article in QEX, as though
there was no way of reproducing the design without purchasing one
of our kits.

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

The design includes a DDS which is controlled either from a knob
or a keypad, and includes switching control to support anyone's
RF modules to make up to a 10-band radio.

The bulk of the article most certainly is NOT a "kit review" as
characterized by KI7RH.

73,

Tim, WA5VQK and Rand, W1GXN




From [e-mail] Mon Feb 05 21:33:29 1996
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From: [e-mail] (Jon Goguen)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: MIL VCO
Date: 31 Jan 1996 23:36:10 GMT
Organization: UltraNet Communications, Inc.
Lines: 15
Message-ID: <[e-mail]>
References: <4el6f3$[e-mail]>
NNTP-Posting-Host: amber1.ultranet.com
X-Newsreader: Value-Added NewsWatcher 2.0b22.0+
Xref: news.epix.net sci.electronics.components:1783 rec.radio.amateur.homebrew:13054

In article <4el6f3$[e-mail]>, [e-mail] wrote:

> Hi,
>
> I've heard that a compagny name Avantek (I'm not shure) make high
> quality VCO.
>
> Does anyone have a pointer of other usefull information ?
>
Avantek was acquired by Hewlett Packard.  You can still get an catalog of
the Avantek products, but you'll have to contact HP for it.

Cheers,

Jon


From [e-mail] Mon Feb 05 21:33:30 1996
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From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: wrinkle paint
Date: 31 Jan 1996 23:54:54 GMT
Organization: Continental Cablevision
Lines: 10
Message-ID: <4eovge$[e-mail]>
References: <4egsuk$[e-mail]> <[e-mail]>
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To: [e-mail]

>One caution, for some reason only black gives a good wrinkle finish.
>If you want a different color, get the wrinkle with black, and then
>top that with whatever color you want after the black dries and >wrinkles.

Thanks for the advice.  I'll try it this weekend on an old Vibroplex
Champion base.

-Paul, N9AZ