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1994-11-13
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17KB
Date: Tue, 14 Jun 94 04:30:20 PDT
From: Ham-Homebrew Mailing List and Newsgroup <ham-homebrew@ucsd.edu>
Errors-To: Ham-Homebrew-Errors@UCSD.Edu
Reply-To: Ham-Homebrew@UCSD.Edu
Precedence: Bulk
Subject: Ham-Homebrew Digest V94 #161
To: Ham-Homebrew
Ham-Homebrew Digest Tue, 14 Jun 94 Volume 94 : Issue 161
Today's Topics:
Help with Antenna Rotator (2 msgs)
HP8052-3081 PIN diodes
HY-GAIN INSTRUCTION/OPERATORS MANUALS up for grabs
ic02e
Instrumentation coaxial relays?
Kits (3 msgs)
Lowfer (1750) plans requested.....
midnight engineering (2 msgs)
Painting a 1.2GHz Antenna (3 msgs)
Thanks: 6M AM HT freqs
Send Replies or notes for publication to: <Ham-Homebrew@UCSD.Edu>
Send subscription requests to: <Ham-Homebrew-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Homebrew Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-homebrew".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Mon, 13 Jun 1994 17:58:21 GMT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!gatech!concert!hearst.acc.Virginia.EDU!cscsun!dtiller@network.ucsd.edu
Subject: Help with Antenna Rotator
To: ham-homebrew@ucsd.edu
I recently purchased a tower and VHF antenna system that happened to
come with a house :-) and I'd appreciate it if someone could give me a
hand figuring out the rotator. The previous owner left a control box,
but I don't think it's the correct one. By some clever sleuthing with
my ohm/inductance meter, I've found the following configuration 'up the
tower':
25mH 25 mH
Y/G --UUUUU---\/---UUUUU---WH/GY
/\
R/BK--------------/ \ 3 mH
| \--UUUUUU----V/BR
V
O --/\/\/\/\/\--BU
470 Ohm
Y/G = Yellow/Green; WH/GY = White/Gray; R/BK = Red/Black; V/BR = Violet/Brown;
O = Orange; BU = Blue
By the looks of it, there are 6 separate wires, with R/BK being ground,
V/BR being the brake, O/BL/R/BK the sense circuit, and Y/G ans WH/GY
being the actual rotator coils. The previous owner says he thinks it's
an alliance HAM IV rotator. Does the above schematic agree? What voltages/
current ratings does this rotator take? The box that was left has 8 outputs -
is it compatible, or is it to another type? (As I recall it says CDR on it -
also 'Cornell Dublier'). If it's not compatible, I'd like to make (a
computer controlled) one. I'm not up to climbing the silly thing (125 feet)
since I fell 'with' an improperly guyed tower some years ago and broke a bone
in my foot. The old courage just ain't the same :-)
Any help will be greatly appreciated, and thanks in advance,
--
David Tiller | Network Administrator | Voice: (804) 752-3710 |
dtiller@rmc.edu | n2kau/4 | Randolph-Macon College| Fax: (804) 752-7231 |
Brady Law critique removed | P.O. Box 5005 | ICBM: 37d 42' 43.75" N |
due to liberal PC pressure. | Ashland, Va 23005 | 77d 31' 32.19" W |
------------------------------
Date: Mon, 13 Jun 1994 20:36:48 GMT
From: news2.near.net!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!dolphin!ed@yale.arpa
Subject: Help with Antenna Rotator
To: ham-homebrew@ucsd.edu
Hi Dave, I have 1 piece of info on you rotator...
It's an AC phase reversible motor. We played with one of these for days at
Gateway Tech before figuring out how to make it run.
25mH 25 mH
Y/G --UUUUU---\/---UUUUU---WH/GY
/\
R/BK--------------/ \ 3 mH
| \--UUUUUU----V/BR
V
O --/\/\/\/\/\--BU
470 Ohm
Y/G = Yellow/Green; WH/GY = White/Gray; R/BK = Red/Black; V/BR = Violet/Brown;
O = Orange; BU = Blue
By the looks of it, there are 6 separate wires, with R/BK being ground,
V/BR being the brake, O/BL/R/BK the sense circuit, and Y/G ans WH/GY
being the actual rotator coils.
To make the motor spin, we used 12vac connected as follows:
ac1 to R/BK (common)
ac2 to Y/G (coil 1)
ac2 through 50uf non pol cap to WH/GY (coil 2)
to reverse direction just switch which coil gets the cap.
I have seen several of these motors, and all have operated on the same principle
of phase lead/lag to make it spin.
I would expect that nearly any rotator would work it provided that the voltage
was same. I have seen a rotor box that had a 24v filament type transformer that
powered it.
Hope this info is of use.
Ed Bathgate
Expect to be N3S** (soon I hope)
------------------------------
Date: 14 Jun 1994 05:13:03 GMT
From: ihnp4.ucsd.edu!usc!cs.utexas.edu!geraldo.cc.utexas.edu!ziggy.ph.utexas.edu!bsn@network.ucsd.edu
Subject: HP8052-3081 PIN diodes
To: ham-homebrew@ucsd.edu
Can anyone suggest a source for small lot quantities of the above
referenced PIN diode?
Thanks,
------------------------------
Date: 13 Jun 1994 19:42:52 GMT
From: ihnp4.ucsd.edu!news.service.uci.edu!mothra.nts.uci.edu!lockhart@network.ucsd.edu
Subject: HY-GAIN INSTRUCTION/OPERATORS MANUALS up for grabs
To: ham-homebrew@ucsd.edu
I have been trying to give this away for some time now. Perhaps
someone will take it off my hands this time.
I have the following INSTRUCTION/OPERATORS MANUAL up for grabs:
HY-GAIN THUNDERBIRD (TH3Mk30 THREE ELEMENT HAM ANTENNA.
This INSTRUCTION/OPERATORS MANUAL is in good condition.
The intent is to give this INSTRUCTION/OPERATOR MANUAL to an
individual or entity who ACTUALLY has the equipment.
The first person to send me e-mail and follow up with a large manila
SASE with postage for 3 ounces gets the prise.
If you are the lucky one, you will be asked to send a SASE (large
manila or other envelope) with the appropriate amount of U.S. postage
to me c/o the address in my .sig file.
Also, as a courtesy, a photocopy of the manual will be sent to anyone
else who sends me a SASE.
Good luck to one and all.
73,
~jack_
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
| Jack C. Lockhart << SNAILMAIL |
| Radio Systems Engineer E-MAIL > LOCKHART@uci.edu |
| OAC - Electronic Comm. Srvcs. !BANG! > ...!ucbvax!ucivax!lockhart |
| 2209 Central Plant Building HAM > WD6AEI |
| University of California, Irvine AMPR > WD6AEI@n0ary.#nocal.ca.usa.na |
| Irvine, CA 92717-5475 VOICE > (714) 856-8477 |
| U.S.A FAX > (714) 725-2270 |
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
"And in the beginning there was nothing. And God said, 'let there be
light'. And there was still nothing, BUT you could see IT!" -Anonymous
/ o o o o o o o . . . ________________________________ _____=======____\_
o _____ | | | |
.][__n_n_|DD[ ====_____ | #include <disclaimer.h> | | |
>(________|__|_[_________]_|______________________________|_|_______________|_
_/oo OOOOO oo` ooo ooo 'o^o^o o^o^o` 'o^o o^o`
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
------------------------------
Date: 14 Jun 1994 10:25:38 GMT
From: ihnp4.ucsd.edu!agate!spool.mu.edu!olivea!flash!robertov@network.ucsd.edu
Subject: ic02e
To: ham-homebrew@ucsd.edu
I am loking for the schematichs diagram and the component view of
the 2 meter RTX named IC02E from ICOM.
It is a 1974 (I guess) 2 meters RTX.
The problem is in the receive section.
Basically it is ok but it need 10 microVolt at the antenna input
in order to receive something.
It should usually be 0.5 microVolt .
I checked this with a R.F. signal gererator.
I do not know if it has an RX preamplifier or what else that can went
bad.
I will really appreciate the schematics but even hits.
please email me at robertov@hqlab.ico.olivetti.com
If anybody is so kind to send me xerox of schematichs and eventualy
components view i can refund his/her money if he/she want to.
It will cost you one dollar for the letter
here is the address :
Ing. C. OLIVETTI S.p.A.
via Jervis 9
10015 IVREA (TO) ITALY
Laboratorio Oliservice
att. Roberto VALFREDINI
Thank to anybody in advance for the time you will give me.
NOTICE
If somebody is going to send me the copies please advise in the internet
other than me in order to not do several and dummy shipment.
Roberto VALFREDINI
------------------------------
Date: 14 Jun 1994 06:12:44 GMT
From: pa.dec.com!nntpd.lkg.dec.com!iamu.chi.dec.com!little@decwrl.dec.com
Subject: Instrumentation coaxial relays?
To: ham-homebrew@ucsd.edu
I'm building transverters for 903 MHz and 1296 MHz and wondering whether
I can use some coaxial relays I picked up at a hamfest for use in T/R
switching at low power. They are instrumentation relays from the looks of
them, i.e. square boxes with BNC connectors, reed relays inside, and
apparently terminated when not powered into a 75 ohm resistive load
(according to my trusty multimeter.) I'm assuming they won't handle more
than a few watts, but for now that's OK with me. My concern is that they
are probably 75 ohm impedence based upon the 75 ohm termination and that
they probably came out of some piece of instrumentation where 75 ohms is
the norm.
The only real information I have is from a label which indicates they were
supplied by R.F. Components, Hoddesdon, Herts, England, model number is
A4202.02.28D.82.04. Also from trying them out, they appear to have 12V
coils, and be configured as 2 SPST relays sharing the normally open
contact.
Will the 50/75 ohm mismatch cause much problem for something like the NEC
monolithic power amps such as the SC1043? Also, what's the likely
power handling capability of such a relay?
73,
Todd
N9MWB
------------------------------
Date: Mon, 13 Jun 1994 13:10:29 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!swrinde!emory!rsiatl!ke4zv!gary@network.ucsd.edu
Subject: Kits
To: ham-homebrew@ucsd.edu
In article <TROCH.94Jun12135608@gandalf.Rutgers.EDU> troch@gandalf.Rutgers.EDU (Rod Troch) writes:
>I am a new ham, waiting for my license. While I wait patiently for those
>12 weeks to pass I figured I would start building some things. One
>thing I would like to build is a CW practice oscillator.
>
>Do you have any simple instrctions and parts list for such a job, or
>do you know of any place that sells such kits?
Congrats on the new ticket. The simplest CPO today is just a piezo-
electric noisemaker, a battery, and a key. Parts available at Radio
Shack. Works good, costs little. However, if you want to be able to
vary the tone, you can use one of any number of single or dual transistor
oscillators, or something squarewave and raspy like a 555 timer. A
two transistor wien bridge feedback oscillator would be the cleanest.
Circuits are in the ARRL Handbook. (You should have a copy of this
book. If not, get it, but in the meantime your library should have
a copy.)
If you want to be absurd, you can program an oscillator on a PC,
using it's internal speaker, and key it via a key hooked to a
status line on a serial or parallel port. This is actually a
good introduction to realtime assembler programming on the PC.
If you don't send too fast, you can even program this in Basic. :-)
Gary
--
Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
Lawrenceville, GA 30244 | |
------------------------------
Date: Mon, 13 Jun 94 21:16:14 GMT
From: ihnp4.ucsd.edu!swrinde!gatech!newsxfer.itd.umich.edu!zip.eecs.umich.edu!panix!198!mgalatz@network.ucsd.edu
Subject: Kits
To: ham-homebrew@ucsd.edu
Is there such a thing as a kit to build a tube receiver
------------------------------
Date: 14 Jun 1994 02:55:06 GMT
From: pa.dec.com!nntpd.lkg.dec.com!iamu.chi.dec.com!little@decwrl.dec.com
Subject: Kits
To: ham-homebrew@ucsd.edu
Antique Electronic Supply in Tempe AZ I'm fairly certain has at least
one tube receiver kit in their catalog.
73,
Todd
N9MWB
------------------------------
Date: Mon, 13 Jun 1994 22:11:12 GMT
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!news.unt.edu!news.oc.com!merlin.etsu.edu!talon@network.ucsd.edu
Subject: Lowfer (1750) plans requested.....
To: ham-homebrew@ucsd.edu
Does anyone know where I can get plans for the Lowfer (1750) band. I am
interested in both CW and Voice.
Thanks,
David Fox
KB5ULK
------------------------------
Date: 13 Jun 94 09:43:36 CDT
From: timbuk.cray.com!ned.cray.com!lindco2!jal@uunet.uu.net
Subject: midnight engineering
To: ham-homebrew@ucsd.edu
Midnight Engineering
111 E. Drake Road, Suite 7041
Fort Collins, CO 80525-9828
This was from the March/April 1992 mag, so don'nt know how current it is.
------------------------------
Date: 13 Jun 1994 17:04:24 GMT
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!col.hp.com!fc.hp.com!jayk@network.ucsd.edu
Subject: midnight engineering
To: ham-homebrew@ucsd.edu
James A Lindberg (jal@cray.com) wrote:
: Midnight Engineering
: 111 E. Drake Road, Suite 7041
: Fort Collins, CO 80525-9828
: This was from the March/April 1992 mag, so don'nt know how current it is.
In the Ft. Collins 1993 phone book Midnight Engineering Magazine is
listed at (303) 491-9092. In the 1994 book there is no listing. I
called the number in the 93 book. It rings once then goes to a busy
signal. Doesn't sound too promising.
73, Jay K0GU jayk@fc.hp.com
Hewlett Packard Ft. Collins
------------------------------
Date: 13 Jun 94 13:41:38 GMT
From: news-mail-gateway@ucsd.edu
Subject: Painting a 1.2GHZ Antenna
To: ham-homebrew@ucsd.edu
When I was doing microwave field work, we often painted 11 Ghz
and 18 GHhz antennas for matching color of structures etc. Most
pigments are Ok. Stay away from those that have a high percentage
of metal oxides or suspended partiCLEs, e.g. metallic looking
finishes. On the Empire State Building we painted some 11.7 Ghz
6 ft. Andrew dishes including the radome cover with no measureable loss
of signal.
------------------------------
Date: 13 Jun 1994 15:32:05 GMT
From: ihnp4.ucsd.edu!usc!nic-nac.CSU.net!charnel.ecst.csuchico.edu!olivea!ncd.com!newshost.ncd.com!hansen.ncd.com!phil@network.ucsd.edu
Subject: Painting a 1.2GHz Antenna
To: ham-homebrew@ucsd.edu
As I recall... The Down East antenna loop elements are all grounded... If that
is the case, I see no problem in painting them.
I would avoid painting the driven element however... Painting this could cause
some strange effects.
Phil
de kj6nn
------------------------------
Date: Mon, 13 Jun 1994 15:05:52 GMT
From: newsflash.concordia.ca!CC.UMontreal.CA!poly-vlsi!nick@uunet.uu.net
Subject: Painting a 1.2GHz Antenna
To: ham-homebrew@ucsd.edu
In article <2tgf2v$hmm@news.tv.tek.com> johnr@soul.tv.tek.com (John Reynolds) writes:
>
>Will a coat of paint degrade the performance of a 1.2Ghz antenna? I have a
>loop yagi from Downeast Microwave that I'd like to spray with some
>"camouflage" paint. Any info is appreciated.
>
>Thanks,
>
>John Reynolds NZ7J
>
>
Should be no problem...as long as you do not use any metallic based paints!
Nick
--
***************************************************************************
* Nick Ciarallo *
* SR Telecom Inc. telephone: 514-335-2429 ex: 438 *
* Microwave Group facsimile: 514-334-7783 *
* 8150 Trans Canada Hwy internet : nick@vlsi.polymtl.ca *
* St. Laurent, Quebec hamradio : ve2hot@ve2fkb.pq.can.na *
* Canada H4S-1M5 *
***************************************************************************
* Accept no substitutes, *REAL* ham radio lives on 220 MHz! *
***************************************************************************
------------------------------
Date: Mon, 13 Jun 1994 16:56:48 CDT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!gatech!newsxfer.itd.umich.edu!jobone!ukma!news.cuny.edu!ndsuvm1!ud167958@network.ucsd.edu
Subject: Thanks: 6M AM HT freqs
To: ham-homebrew@ucsd.edu
Thanks to all the folks who responded to my query about converting
RS walkie-talkies to 6M. Our netnews program here got messed up
and dumped about 12 days worth of news items, so if you sent
me something and I didn't reply, it's nothing personal B-).
------------------------------
End of Ham-Homebrew Digest V94 #161
******************************