Date: Tue, 4 Jan 94 04:30:33 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 #154 To: Ham-Homebrew Ham-Homebrew Digest Tue, 4 Jan 94 Volume 93 : Issue 154 Today's Topics: Need help to what may be a stupid question.... Technical articles 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: Tue, 4 Jan 1994 05:52:05 GMT From: library.ucla.edu!agate!howland.reston.ans.net!news.moneng.mei.com!uwm.edu!msuinfo!harbinger.cc.monash.edu.au!bruce.cs.monash.edu.au!trlluna!titan!pcies4.trl.OZ.AU!drew@network.ucsd.edu Subject: Need help to what may be a stupid question.... To: ham-homebrew@ucsd.edu In article st92ba44@dunx1.ocs.drexel.edu ( antonio gatta) writes: >From: st92ba44@dunx1.ocs.drexel.edu ( antonio gatta) >Subject: Need help to what may be a stupid question.... >Date: Mon, 3 Jan 1994 22:29:42 GMT > >hello. > I'm rather new at this (just thought i'd let you know up front). >anyway, i'm working on a shortwave superhet reciever (which uses the >TDA7000 IC chip) and, now that i'm all done, it doesn't work. I've checked >the thing 2 or 3 times now (its driving me crazy). Here is where my problem >may be: i don't know where to anchor the -12V lead. :\ The schematic i have >does not include the negative lead (i suppose i should *know* where it goes). >I hooked it to ground and, obvioulsy, got a short (my batteries were glowin' >red; i.e. they became extremely hot). The audio output seems, to me, to just >be the output from a capacitor or three (loud at first, no signal, then >gradually dies down). The other radios have the negative lead going to >a tap from one of the toroid coils...but that doesn't work for me. BTW, >it is a 455-kHz superhet IF circuit with varactor-tuned coils. > i'd appreciate any help i could get. thanks in advance. > > > >______________________________________ >antonio gatta >st92ba44@dunx1.ocs.drexel.edu > Which circuit are you using? The "Explorer" HF receiver by Paul Daulton (73 Amateur Radio Aug. '92) has pin 16 as ground (presumably for -12V supply and signal). Try to look this article up- it may have some valuable clues for you. Drew, VK3XU. Telecom Australia Research Laboratories. ------------------------------ Date: 4 Jan 94 09:31:27 GMT From: sdd.hp.com!cs.utexas.edu!howland.reston.ans.net!xlink.net!fauern!rz.unibw-muenchen.de!claude@network.ucsd.edu Subject: Technical articles To: ham-homebrew@ucsd.edu I want to write 2 articles about new circuits related to RTTY. Which publisher can be interested by the subject ? How can I contact him ? -- Claude F. This message may contain opinions which are not shared by my employer. The facts can speak for themselves. ------------------------------ End of Ham-Homebrew Digest V93 #154 ****************************** ******************************