Date: Sun, 27 Feb 94 04:30:47 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 V94 #44 To: Ham-Homebrew Ham-Homebrew Digest Sun, 27 Feb 94 Volume 94 : Issue 44 Today's Topics: Challenge: Cheapest (least expensive) homeb Fcc Refulations. Voltage Regulator questions What test equipment do you use? (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: 25 Feb 94 11:31:57 CST From: mvb.saic.com!unogate!news.service.uci.edu!usc!elroy.jpl.nasa.gov!ncar!uchinews!cdsmail!timbuk.cray.com!hemlock.cray.com!cherry10!dadams@network.ucsd.edu Subject: Challenge: Cheapest (least expensive) homeb To: ham-homebrew@ucsd.edu I am not ready to get into this contest myself, but only because I am trying to move the project to 220 instead of 2 meters. Now that the FCC has opened the entire 220 band to the Novice class license I think it is the perfect opportunity to get my sons interested in working toward their first license. Motorola makes a few chips with an entire low power dual conversion FM receiver on a chip (the MC3363 or the MC13135 or the MC3362 etc.) and another chip the MC2833 a low power FM Transmitter system. Each of these require a few external parts, but only a minimal few. Order data sheets MC2833/D, MC3363/D, MC13135/D, and Winter 1992 Communications Quarterly reprint article. Also Application note AN980/D contains instructions, board layout etc., for a 256 Channel Frequency Synthesized Two Meter Amateur Band Receiver. The other documentes describe other circuits/projects. I got the boards and set of chips free. I dunno, maybe I should try it first on 2 m just to make sure I can do it. In article 6jg@u.cc.utah.edu, val@cs.weber.edu (Val Kartchner) writes: > Here is a challenge for those in homebrew-land: > > What is the lowest cost voice amateur transceiver that can be homebrewed? > > Other parameters to consider are: > > - It should be from parts that are easy to get (Junk box, Radio Shack, > etc.), or are easy to build (air-core coils, etc.). > > - It only needs to get a clear signal about 5 miles (in a residential > zone - lots of low-level obstacles), but 10 miles would be better. > > - It may transvert the signal to a very low power transmission (for > reception in the same room) in the AM or FM broadcast bands (if this > is legal) for signal decode/output. (The separate AM/FM radio > should be listed but not included in the cost estimate.) > > - It may be crystal tuned to one or few frequencies. > > - If it cannot run off of a personal computer power supply, then include > the power supply price as well. (If it cannot run off of +12V @ 2A, > then it is probably overpowered for this application anyway.) > > - Cost of a simple antenna should be included. (Coat hangers can > be considered as being free.) > > - It should be as small as possible, but need not be a handheld. > > 73 -- KB7VBF > -- > |================= #include ================///=============| > | "AMIGA: The computer for the creative mind" (tm) Commodore /// Weber State | > | "Macintosh: The computer for the rest of us"(tm) Apple \\\/// University | > |== "I think, therefore I AMiga" -- val@csulx.weber.edu ==\///= Ogden UT USA =| --- Sourdough and Ham AA0PV --David C. Adams internet: dadams@cray.com Statistician uunet: uunet!cray!dadams Cray Research Inc. packet: kg0io@tcman.#msp.mn.usa.noam "The significant problems we face cannot be solved at the same level of thinking we were at when we created them." -- Albert Einstein. ------------------------------ Date: 26 Feb 1994 05:07:14 GMT From: hmwaljee@athena.mit.edu Subject: Fcc Refulations. To: ham-homebrew@ucsd.edu Hello. I am not sure if this is 100% relevant for this channel, but I figure that the people that would know anything about the area of my question are subscribed to this channel. I am a student here at MIT that is implementing a project to "track" the MIT shuttles, so that students logged into the network will be able to find out where it is and when to wait. In order to do this, I was probably going to use a numerical code, transmitted using touch-tone (DTMF) encoders and decoders, In order to do this, however, I would have to use a frequency on which to transmit. Thus, this project then finds itself at the hands of the FCC. I was wondering if anyone out there knows about the regulations concerning broadcasting "beeps" over the range of a few square miles in a major city. This will probably be a signal in the range of 10^1 kW. Which regulations apply? How do I find out about them? What radio bands would/could I use? Any idea as to the efficiency of such transmission? Anyway, thanks for listening, and I hope someone out there has both the answers and the time to write back. Replies to: hmwaljee@mit.edu Thanks again, Hussein ------------------------------ Date: Fri, 25 Feb 1994 23:42:15 GMT From: mvb.saic.com!unogate!news.service.uci.edu!ihnp4.ucsd.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!hplextra!hpcss01!markb@network.ucsd.edu Subject: Voltage Regulator questions To: ham-homebrew@ucsd.edu National Semiconductor LM196K or LM396K 10 AMP 1.25 to 15V adjustable LM138K or LM338K is 5 Amp version these are not cheap but work well (use a big heat sink) ------------------------------ Date: Fri, 25 Feb 1994 23:56:19 GMT From: mvb.saic.com!unogate!news.service.uci.edu!ihnp4.ucsd.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!hplextra!hpcss01!markb@network.ucsd.edu Subject: What test equipment do you use? To: ham-homebrew@ucsd.edu I must have forgotten some... I like the test equipment more than the projects. Anyother test equipement junkies out there? ------------------------------ Date: Fri, 25 Feb 1994 23:55:20 GMT From: mvb.saic.com!unogate!news.service.uci.edu!ihnp4.ucsd.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!hplextra!hpcss01!markb@network.ucsd.edu Subject: What test equipment do you use? To: ham-homebrew@ucsd.edu Scopes: tek 535 545 hp 180 philips generators: hp200 hp215? military URM26 URM26 sweepers 1-4 4-8 8-12 GHz hp Hickok tube tester LCR meter - 2 spectrum analyzer AIL757 (to 22ghz) counter hp5345l hp???? (solid state) DVM 5.5 digit and down 7 digit voltage calibrator pulse generator hp211 EH scalar hp8755 power meter hp wavetek 8542 (I designed this one) power supplies hp home built ------------------------------ End of Ham-Homebrew Digest V94 #44 ****************************** ******************************