Date: Tue, 29 Mar 94 04:30:54 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 #77 To: Ham-Homebrew Ham-Homebrew Digest Tue, 29 Mar 94 Volume 94 : Issue 77 Today's Topics: Digital Frequency Synthesizer QST 4/84 & 2/85 How to do PSK demodulation? How to receive FM subcarrier signals IC 2A 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: 28 Mar 94 15:33:08 GMT From: agate!howland.reston.ans.net!cs.utexas.edu!geraldo.cc.utexas.edu!calvin.ph.utexas.edu!bsn@ucbvax.berkeley.edu Subject: Digital Frequency Synthesizer QST 4/84 & 2/85 To: ham-homebrew@ucsd.edu There was a very interesting direct digital frequency synthesizer described in QST for April 1984 and February 1985. I would like to obtain a copy of the PROM listing for the synthesizer unit. I am also interested in the assemply code for the controller but that is not as nesessary as the PROM listing. The synthesizer used a TRW D/A converter, TDC106J-8 (TDC106B7C8 in the processor controlled version). If anyone knows if this device still available or if their is an equivalent that is, please let me know. Tnx es 73, Barry Newberger W5KH ------------------------------ Date: 28 Mar 1994 16:17:40 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!usenet.ins.cwru.edu!slc6!trier@network.ucsd.edu Subject: How to do PSK demodulation? To: ham-homebrew@ucsd.edu What are the reasonable ways to do binary phase shift keying demodulation for amateur radio? A pointer to a reference on it would be fine. I've found lots of statements that it can be done, but nothing detailed about how to do it. Stephen -- Stephen Trier KB8PWA "It don't mean a thing if it ain't got that Other: trier@ins.cwru.edu certain je ne sais quois." Home: sct@po.cwru.edu - Peter Schickele ------------------------------ Date: 28 Mar 94 22:50:23 GMT From: agate!howland.reston.ans.net!gatech!prism!prism!not-for-mail@ucbvax.berkeley.edu Subject: How to receive FM subcarrier signals To: ham-homebrew@ucsd.edu What does one need for receiving FM subcarrier signals? Any information or suggestions will be appreciated. -- Kevin Martin Georgia Institute of Technology, Atlanta Georgia, 30332 uucp: ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!kmartin Internet: kmartin@prism.gatech.edu ------------------------------ Date: 28 Mar 94 14:04:00 GMT From: news-mail-gateway@ucsd.edu Subject: IC 2A To: ham-homebrew@ucsd.edu Hi, Ed - I've got an IC 2AT - same radio, but with the touch-tone pad option. If you'ld like a copy of the owners manual and a schematic, I can put one together for you. The BEST way to power the rig externally from 12-14 vdc is an adaptor called the DC-1, I believe, which converts 12-14 vdc to about 9.6 VDC and runs the transmitter at about 1.5 to 2 watts. The maximum safe voltage for the unit appears to be about 10 volts - I think the BP-5 (a high-power drop-in charge power pack from ICOM) is maybe 10.8 volts. Twelve volts or higher applied directly to the battery input terminals will probably smoke the radio, so don't do it. If you can't find the stock DC adapter, you can build one from an old BP-2 or BP-3 battery pack by wiring in a simple voltage regulator circuit and a protective fuse. Make sure you get a 10V regulator - they're a little rarer than than the usual 12 v ones. One of my favorite replacement battery packs for the 2A is a Delcom pack available from TNR, W&W and other battery stores. This pack holds 8 standard AA NiCds and has the built-in charging circuitry similar to that in the ICOM's own BP-3 type batteries. You can keep a spare set of charged NiCds and snap them in when the first set runs down. The price with A set of AA's is around $27. It's a little more fragile than an ICOM-built pack, but it lasts a long time on a charge. I hope this helps. Let me know if you need the manual and schematics. 73 de KD1DJ, Alan. ------------------------------ End of Ham-Homebrew Digest V94 #77 ****************************** ******************************