Date: Fri, 24 Dec 93 04:30:35 PST 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 V93 #142 To: Ham-Homebrew Ham-Homebrew Digest Fri, 24 Dec 93 Volume 93 : Issue 142 Today's Topics: - - television disruptor - - 6 Meter (3 msgs) 80 M DSB transceiver project Charging Deep-Cycle Batteries from Automobile funny reception on my amp (?) ....curious. Heathkit DX-60B Mod? Two meter monitor from NEW Radio Shack WX cube? (2 msgs) 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: Wed, 22 Dec 1993 16:07:12 GMT From: library.ucla.edu!agate!spool.mu.edu!darwin.sura.net!rsg1.er.usgs.gov!news.cs.indiana.edu!noose.ecn.purdue.edu!ghg@network.ucsd.edu Subject: - - television disruptor - - To: ham-homebrew@ucsd.edu In article markm@xetron.com (Mark Malson) writes: >In article quixote@eskimo.com (Looking for Sancho) writes: >> The intended use of this device is to be put with a timer >> against the wall where my new neighbor has his television set. > >If it's right up against the wall, you could get a really big magnet, >like from a 12" woofer or bigger. You could make a large electromagnet >too. Then, stand right at the closest point to his TV and move the >magnet around a whole bunch. It should make his picture wave around >enough to make him think he's sleepy or to just make him scratch his >head. > >Fun to do to people's computer monitors too. And no FCC violation >involved. > >- Mark Malson > markm@xetron.com > Make a large coil of wire, 10 turns or so #16 or so size , cover your entire wall which faces the enemy with this loop. Get a "variac" (variable autotransformer from radio shaft or a ham fest). Connect that to a 120V to 6V or 12V step down transformer. You need A/C, not DC out.. If you cobble up an old battery charger, take out the rectifier and go off the AC from the transformer secondary.. Turn up the juice slowly until the wire gets a little warm.. The resultant magnetic field should affect CRTs for 20 feet or so and will make them "flicker", as the shadow mask vibrates and from direct effect on the electron beam. It is not powerful enough to erase tapes, etc. If all out war results, then you may have to resort to the following: How about a 10' diameter coil of wire, such as lampcord (single conductor), maybe 100-200 turns? You could probably get by with #22 or such, it would be cheaper.. then pick up some surplus large high voltage electrolytic Capacitors.. say 2000 mfd @ 450 VDC. Charge that baby off some power supply, and discharge it into the coil. Make sure your TV, tapes, credit cards, are at the far end of your house, or out in your car.. Then blast away.. It may magnetize the shadow mask in his TV (fill it with rainbow colors), erase his credit & ATM cards and his tapes?? With 3-4 of these Caps in parallel, we are probably talking around a million watt pulse (for approx 1 millisec).. might be good to fire this off remote control.. --ghg ------------------------------ Date: 22 Dec 1993 19:51:44 -0700 From: europa.eng.gtefsd.com!howland.reston.ans.net!sol.ctr.columbia.edu!hamblin.math.byu.edu!news.byu.edu!cwis.isu.edu!u.cc.utah.edu!xmission.xmission.com!xmission.xmission.@@library.ucla.edu Subject: 6 Meter To: ham-homebrew@ucsd.edu Hello everyone, I am thinking of building a 6M SSB Transciver. I would like to know if this is a worthwhile project. I would mainly like to do it for the experience of doing it. I would like info of Schematics if possible, I could probably design one if pointed to the correct books, but would like to not do so if there is something out there that works well. I am a no-code Tech and would like to see if I can get some DX with my privs. I haven't had time to learn code yet so just want something to play with but would like a good radio to use in the future. If you have any info on 6M I would appreacte it. Band Condidions would be usefull as well. Thanks in advance. Travis - KB7SEI bigboss@xmission.com ------------------------------ Date: Thu, 23 Dec 1993 15:23:04 GMT From: swrinde!emory!kd4nc!ke4zv!gary@network.ucsd.edu Subject: 6 Meter To: ham-homebrew@ucsd.edu In article <2fb140$e8k@xmission.xmission.com> bigboss@xmission.xmission.com (Travis Tabbal) writes: > >Hello everyone, I am thinking of building a 6M SSB Transciver. I would >like to know if this is a worthwhile project. I would mainly like to do it >for the experience of doing it. I would like info of Schematics if >possible, I could probably design one if pointed to the correct books, but >would like to not do so if there is something out there that works well. I >am a no-code Tech and would like to see if I can get some DX with my >privs. I haven't had time to learn code yet so just want something to play >with but would like a good radio to use in the future. If you have any >info on 6M I would appreacte it. Band Condidions would be usefull as well. >Thanks in advance. Travis, building an SSB transceiver of any kind is a complex and ambitious project. That's why most amateurs restrict themselves to transverters, amplifiers, or FM/CW equipment. 6 meters is also an in between band where normal HF techniques don't quite work, yet VHF/UHF techniques are too bulky. The *easiest* approach is to modify an old SSB CB set to work on 6 meters. This gives you a good SSB subsystem as a foundation. If you want to build from scratch, there's a complete SSB transceiver design in the 1977 Handbook. It relies on the MC1496G as a balanced modulator. There are better ways today using hybrid ring mixers, but the current Handbook doesn't offer anything except QRP CW rigs. You might try the RSGB books instead. Or check out Rick Campbell's design published in either QST or QEX earlier this year. Generally a filter method design is easier to get working correctly than a phasing or Weaver method design. You'll probably want to take as modular an approach as possible to aid in troubleshooting, and to make it easier to add upgrades. 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: Thu, 23 Dec 1993 16:43:42 GMT From: library.ucla.edu!europa.eng.gtefsd.com!darwin.sura.net!fconvx.ncifcrf.gov!mack@network.ucsd.edu Subject: 6 Meter To: ham-homebrew@ucsd.edu In article <2fb140$e8k@xmission.xmission.com> bigboss@xmission.xmission.com (Travis Tabbal) writes: > >Hello everyone, I am thinking of building a 6M SSB Transciver. I would >like to know if this is a worthwhile project. >KB7SEI This is a large project so you might want to make it modular enough that that you can use the exciter and receiever parts for other bands. 6m is fairly quiet and will be getting more so till the sunspots improve. Things still happin contests and for metoer scatter but by and large you won't be using your rig on 6m as much as on other bands. I don't know if you are looking for something to build or to get on 6m. Since hams don't seem to have a lot of time to design and debug equipment, it's nice if all the work that one person does (like the thing you are trying to do) can be then reproduced by others (ie publish it in QST, QEX, Comm Quart..). Since transceivers are relatively cheap (TS140 etc) not many hams will want to reproduce your rig, even when you publish it. Most people put a transverter in front of their transceiver and go from there. There aren't many trasnverter designs for 100W out on 6m (this amount of power is needed to drive big linears). Would such a thing interest you? Joe NA3T mack@ncifcrf.gov ------------------------------ Date: 23 Dec 93 22:44:15 +1200 From: munnari.oz.au!comp.vuw.ac.nz!canterbury.ac.nz!chmeds.ac.nz!spearce@network.ucsd.edu Subject: 80 M DSB transceiver project To: ham-homebrew@ucsd.edu Electronic Australia recently ran an article on a DSB 80 transceiver with a synthesiser in built. Does anyone know of a source for the kit for this project and maybe cost? Thanks Stephen ------------------------------ Date: Thu, 23 Dec 1993 18:24:27 GMT From: swrinde!sdd.hp.com!col.hp.com!csn!boulder!beagle!eesnyder@network.ucsd.edu Subject: Charging Deep-Cycle Batteries from Automobile To: ham-homebrew@ucsd.edu I have been thinking about battery setups for remote HF/VHF station. From what I have read, the deep cycle marine/RV batteries are the way to get a good strong 12 volt DC power supply. However, I am wondering what the best way to charge such cells. Can I simply run a set of jumper cables from my car battery to the cell while I am driving? Do I need any sort of regulation or will my car's electrical system take care of this? Any suggestions or references would be greatly appreciated. The reading I have done consists mainly of an article in QST on solar-powered stations... so, of course, it didn't talk a lot about other ways to charge the batteries. Thanks, Eric E. Snyder Department of MCD Biology ...making feet for childrens' shoes. University of Colorado, Boulder Boulder, Colorado 80309-0347 ------------------------------ Date: Wed, 22 Dec 1993 22:06:56 GMT From: library.ucla.edu!agate!msuinfo!netnews.upenn.edu!netnews.noc.drexel.edu!dunx1.ocs.drexel.edu!dunx1!st92ba44@network.ucsd.edu Subject: funny reception on my amp (?) ....curious. To: ham-homebrew@ucsd.edu the other night i put together a small amp to drive a small pm speaker that i wanted to use on my sw xtal radio (instead of headphones). anyway, i put the amp on the radio output and it worked okay; it drove the speaker reasonably well on the stronger signals. The wierd thing happened when i was taking it apart to make it more permanent; the antenna lead from outside accidentally hit the ground on my amp (while the power was on) and it picked up a station! (the amp was not hooked to the radio). I was wondering how, just the amp, could get any signal at all....its just a bunch of capcitors and a speaker. I realize its for amplification of a signal and the ant just provided one (i couldn't change channels, just the volume... ...i suppose because the equiv capac. was constant) but it had no crystal, no coil, nothing. any ideas? (just curious). ______________________________________ antonio gatta st92ba44@dunx1.ocs.drexel.edu ------------------------------ Date: 23 Dec 93 14:54:14 GMT From: ogicse!uwm.edu!math.ohio-state.edu!sol.ctr.columbia.edu!news.unomaha.edu!cwis.unomaha.edu!ncc2001@network.ucsd.edu Subject: Heathkit DX-60B Mod? To: ham-homebrew@ucsd.edu zateslo@geomag.gly.fsu.edu writes: > If you were to try to modify a DX-60 itelf for SSB, you'd have > little left but the final stage, and you'd have pretty much > destroyed a nice little CW transmitter. That would appear to be the general feeling of the replies I've gotten. Oh, well, I can still use it on CW as soon as I can afford a rcvr! :) > That said, I sure hope nobody is throwing DX-60s (or any other > vintage ham gear) into landfills! Well, if anybody out there is going to throw away any working rig because it is old and out of date, just drop me a line here. My father works for a truck company and can get things shipped to and from him for free. Drop me a line, I'm getting divorced and any ham equipment will be appreciated. 73 de N0YBC Michael -- | Michael Fortner N0YBC | "What do you want for Christmas, | | Internet: ncc2001@cwis.unomaha.edu | Crow?" | | Packet: N0YBC@WB0BLR.#SWIA.IA.USA.NA | "I want to decide who lives and who | | | dies!" - MST3K | ------------------------------ Date: Wed, 22 Dec 1993 14:49:14 GMT From: usc.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!fnnews.fnal.gov!att-in!att!devildog!newsadm@network.ucsd.edu Subject: Two meter monitor from NEW Radio Shack WX cube? To: ham-homebrew@ucsd.edu Has anyone taken a look at Radio Shack's NEW Weather Cube? Several years ago they used to have a weather cube that you could modify to serve as a dedicated monitor for one or two frequencies on the two meter band (I think the mod was in QST, anyone know the year and issue?) I'm pretty sure it was just a trivial modification too (add a capacitor and tune it??) The big question: Does anyone know if the NEW weather cube COULD be (easily) modified to receive two meters? Same procedure as the old one? Anyone tried it? Douglas Quagliana KA2UPW dquagliana@attmail.com ------------------------------ Date: 24 Dec 93 10:37:22 GMT From: ogicse!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!wvanhorn@network.ucsd.edu Subject: Two meter monitor from NEW Radio Shack WX cube? To: ham-homebrew@ucsd.edu >Several years ago they used to have a weather cube that >you could modify to serve as a dedicated monitor for one >or two frequencies on the two meter band (I think the >mod was in QST, anyone know the year and issue?) I'm pretty >sure it was just a trivial modification too (add a capacitor >and tune it??) The article was in HAM RADIO, May, 1973, p. 76. I got this info from the index by Didah Publishing. I don't have a copy of the mag. 73, Van - W8UOF ______________________________________________________________ ! It ain't wot you don't know wot gets you into trouble. ! ! It's wot you know wot ain't true. - "Mr. Dooley" ! !_____________________________________________________________! wvanhorn@magnus.acs.ohio-state.edu ------------------------------ Date: Thu, 23 Dec 1993 17:25:12 GMT From: swrinde!sgiblab!spool.mu.edu!torn!news.cs.uwindsor.ca!dwills@network.ucsd.edu To: ham-homebrew@ucsd.edu References , <1993Dec21.143219.4967@mnemosyne.cs.du.edu>, <2fapjm$8aa@psu_075.chem.pdx.edu> Subject : Re: - - television disruptor - - Anything with a flyback converter in it will spew out lotsa wideband noise... -- Michael Dunn dwills@uwindsor.ca ------------------------------ Date: Thu, 23 Dec 1993 15:38:37 GMT From: library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!yuma!galen@network.ucsd.edu To: ham-homebrew@ucsd.edu References <1993Dec22.000911.9923@ultb.isc.rit.edu>, <2f8h82$ipb@crl.crl.com>, <1993Dec22.234711.17005@ultb.isc.rit.edu>cs. Subject : Re: Mini-Circuits MAR-6 amp/Filtering the input. In article <1993Dec22.234711.17005@ultb.isc.rit.edu> jdc3538@ultb.isc.rit.edu (J.D. Cronin) writes: >Thanks for all the replies. For 2-meter use, would a bandpass filter >on the input suffice? I was thinking of picking a generic one from the >ARRL Handbook, and adjusting the values for 146 mhz. >73...Jim >N2VNO Look at the Toko Helical Resonator filters in the Digi-Key catalog. Toko also has some that won't require retuning, but their catalog is at my office and I'm on vacation. Galen, KF0YJ, DN70 ------------------------------ Date: Fri, 24 Dec 1993 01:55:11 GMT From: newshub.nosc.mil!crash!news.sprintlink.net!direct!indirect.com!btoback@network.ucsd.edu To: ham-homebrew@ucsd.edu References <2f8h82$ipb@crl.crl.com>, <1993Dec22.234711.17005@ultb.isc.rit.edu>, Subject : Re: Mini-Circuits MAR-6 amp/Filtering the input. In article galen@picea.CFNR.ColoState.EDU (Galen Watts) writes: >In article <1993Dec22.234711.17005@ultb.isc.rit.edu> jdc3538@ultb.isc.rit.edu (J.D. Cronin) writes: >>Thanks for all the replies. For 2-meter use, would a bandpass filter >>on the input suffice? I was thinking of picking a generic one from the >>ARRL Handbook, and adjusting the values for 146 mhz. >>73...Jim >>N2VNO > >Look at the Toko Helical Resonator filters in the Digi-Key catalog. Toko >also has some that won't require retuning, but their catalog is at my office >and I'm on vacation. >Galen, KF0YJ, DN70 > Good idea, Galen! The Toko TK3506 has a center frequency of 145mHz with a bandwidth of 2.8mHz. It's available from Digi-Key for $23.53 for one, or $117.67 for ten. By the way, their catalog is free and is well worth having. The phone number is 1-800-344-4539 (800 DigiKey). -- Bruce Toback ------------------------------ End of Ham-Homebrew Digest V93 #142 ****************************** ******************************