Date: Sat, 25 Jun 94 04:30:18 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 #173 To: Ham-Homebrew Ham-Homebrew Digest Sat, 25 Jun 94 Volume 94 : Issue 173 Today's Topics: JDR Microdevices (4 msgs) L.O FOR 1.2, 1.3, 1.4, 1.5 GHZ need info on Helical filter design Newcomer to Radio looking for advice 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: 24 Jun 1994 17:49:13 GMT From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!lll-winken.llnl.gov!s07.es.llnl.gov!hunter@network.ucsd.edu Subject: JDR Microdevices To: ham-homebrew@ucsd.edu The new JDR kits are the same price and have the same part numbers as the Ramsey kits. Interesting coincidence. Steven Hunter ------------------------------ Date: 24 Jun 1994 21:45:02 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!library.ucla.edu!europa.eng.gtefsd.com!uhog.mit.edu!news.kei.com!ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore@network.ucsd.edu Subject: JDR Microdevices To: ham-homebrew@ucsd.edu In article , Jeffrey Austen wrote: >For example, when QST reviewed the 2m (Ramsey) >xcvr they found that the transmitter did not meet FCC spurious emission >specifications. You get what you pay for....Jeff, k9ja Hi Jeff, you forgot to say that two ten cent caps solve the problem and I'm sure those caps are included in the Ramsey FX kits by now. 73, KG7BK, OOTC, CecilMoore@delphi.com ------------------------------ Date: Fri, 24 Jun 1994 14:47:37 GMT From: spsgate!mogate!newsgate!news@uunet.uu.net Subject: JDR Microdevices To: ham-homebrew@ucsd.edu In article <1994Jun23.203328.13889@galileo.cc.rochester.edu> BILLY@urhep.pas.rochester.edu (Bill VanRemmen) writes: > Has anyone else noticed that JDR seems to have picked up lots of neat lines? I > was just flipping through their electronic components catalog and they've got > about 6 pages of kits, including a 2m xcvr for $150. Case is extra (like I > want a naked board...). > > They've also got a pretty good selection of IC's including the MC1350 IF amp > and the NE602... visible laser diode... cases... > ... I've ordered parts from JDR a few times. They do seem to have some stuff that's hard to find elsewhere. The kits are Ramseys. For what it's worth... 73... Mark AA7TA ------------------------------ Date: Fri, 24 Jun 94 20:09:45 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!spool.mu.edu!darwin.sura.net!atlas.tntech.edu!news!jra1854@network.ucsd.edu Subject: JDR Microdevices To: ham-homebrew@ucsd.edu In Article <1994Jun23.203328.13889@galileo.cc.rochester.edu>, BILLY@urhep.pas.rochester.edu (Bill VanRemmen) wrote: >Has anyone else noticed that JDR seems to have picked up lots of neat lines? I >was just flipping through their electronic components catalog and they've got >about 6 pages of kits, including a 2m xcvr for $150. Case is extra (like I >want a naked board...). Those kits are from Ramsey Electronics. The performance of the completed kits is, ummm, less than optimal. For example, when QST reviewed the 2m xcvr they found that the transmitter did not meet FCC spurious emission specifications. You get what you pay for.... Jeff, k9ja ------------------------------ Date: Fri, 24 Jun 1994 16:39:57 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!overload.lbl.gov!agate!howland.reston.ans.net!usc!sdd.hp.com!col.hp.com!srgenprp!glenne@network.ucsd.edu Subject: L.O FOR 1.2, 1.3, 1.4, 1.5 GHZ To: ham-homebrew@ucsd.edu Mike Lyon (mlyon@rahul.net) wrote: : well i am trying to design a L.O for 1.2, 1.3, 1.4, 1.5 ghz. i don't Mike, You might be interested in the 1010 MHz coaxial/troughline oscillator I showed in my microwave station design series in Feb/Jun/Oct 1988 Ham Radio Magazine. Although the series describes construction of the halfwave line version, I also refer to a quarterwave line version which is very similar. This allows mechanical tuning with a telescoping center conductor made from hobby store brass tubing and the ones I built would tune from .8 to 1.2 GHz or more. This oscillator provides low phasse noise along with wide (mechanical) tuning range. If you are looking for multiple precision oscillators, you might easily build several of these and lock each to a different line of a 50 MHz reference as the articles shows (using a 100 MHz phaslocked VCXO). I used the phaselocked 1010 MHz oscillator to in turn lock up a 10100 MHz oscillator for 10,368 MHz SSB. The resulting performance and phase noise was quite acceptable and is also shown in the series. Glenn Elmore n6gn amateur IP: glenn@SantaRosa.ampr.org Internet: glenne@sr.hp.com ------------------------------ Date: 24 Jun 1994 17:21:10 GMT From: ihnp4.ucsd.edu!news.cerf.net!lsi.lsil.com!up55!achien@network.ucsd.edu Subject: need info on Helical filter design To: ham-homebrew@ucsd.edu I am looking for information on how to design a "Helical filter" . Any books, papers or design equations available for this kind of filters? I know "TOKO coil" make this kind of filters but I need to custom design my own filter. --- Arthur Chien ------------------------------ Date: 24 Jun 1994 15:03:47 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!europa.eng.gtefsd.com!news.ans.net!news.nynexst.com!nynexst.com!rhofmann@network.ucsd.edu Subject: Newcomer to Radio looking for advice To: ham-homebrew@ucsd.edu Hi everyone. I'm a newcomer to the world of home-built transmitters/receivers and I have a few things I'd like to ask of the collective net-wisdom. My interest in this group stems from the desire, as sort of a summer project perhaps, to build some sort of a short range transmitter/receiver that I could perhaps use to link 2 computers together at school via a null modem type connection perhaps. I don't have very much experience with radio in particular, but I will be going into my senior year as a physics major and I have had at least an overview of electronic devices and circuits. What I'm wondering is: - Is this a feasible project to undertake? - If so, where might I find plans/designs to work off of in constructing such a device? - What frequency bands if any would I legally be able to make use of? - What frequency bands and how much power would I need in order to transmit reliably within a dormitory for example (cinder block walls, max distance of maybe 500 feet) Any information that might help would be appreciated. Reply via postings or email. -- Bob Hofmann rhofmann@darwin.cc.nd.edu University of Notre Dame rhofmann@nynexst.com NYNEX Science & Technology ------------------------------ End of Ham-Homebrew Digest V94 #173 ******************************