Date: Tue, 14 Jun 94 04:30:20 PDT From: Ham-Homebrew Mailing List and Newsgroup 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: Send subscription requests to: 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 | | | >(________|__|_[_________]_|______________________________|_|_______________|_ _/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@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 ******************************