Date: Fri, 20 May 94 04:30:55 PDT From: Ham-Space Mailing List and Newsgroup Errors-To: Ham-Space-Errors@UCSD.Edu Reply-To: Ham-Space@UCSD.Edu Precedence: Bulk Subject: Ham-Space Digest V94 #129 To: Ham-Space Ham-Space Digest Fri, 20 May 94 Volume 94 : Issue 129 Today's Topics: Eggbeater Antenna Mars Observer radio frequencies? (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-Space Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives/ham-space". 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, 18 May 1994 18:26:46 GMT From: ihnp4.ucsd.edu!news.acns.nwu.edu!news.eecs.nwu.edu!psuvax1!news.pop.psu.edu!news.cac.psu.edu!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ae517@@. Subject: Eggbeater Antenna To: ham-space@ucsd.edu There was a chap on this newsgroup about a month or so back who was inquiring as to the construction of the Eggbeater antenna. Just for his info, there is a short article in the May CQ magazine on page 29 that gives some detail. Apparently, the two perpendicur loops are fed in the same manner as a turnstile antenna, ie 90 degrees out of phase. The author describes this as being close to isotropic in radiation pattern in free space. I was under the impression, perhaps mistakenly, that a single loop had very little radiation parallel to the plane of the loop, c'est a dire, all the radiation was broadside to the loop. Could one of you antenna design mavens explain why is it that when two perpendicular loops are fed 90 degrees out of phase, it becomes an isotropic antenna. As well, what numbers would one plug into Mininec to model this getup? Russ Renaud va3rr/aa8lu va3rr@amsat.org -- ------------------------------ Date: 19 May 1994 02:00:36 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!netline-fddi.jpl.nasa.gov!sookit!rspear@network.ucsd.edu Subject: Mars Observer radio frequencies? To: ham-space@ucsd.edu Greg (laborde@elm.jpl.nasa.gov) wrote: : In article Dave Jacob, : jacob@altair.csustan.edu writes: : >with ham gear? It seems top me that wh hams are in a unique : >position to prove once and for all if this machine is still : >working or not. : Maybe. JPL's Deep Space Network used 70m dish antennas to listen for MO. : What kind of antenna do you have? : -Greg greg - the frequencies being looked for are vhf . . . they are tones that were meant to be used for vlbi. a proposal here at jpl suggested that a yagi antenna be mounted to the 70 meter dish (focused on the dish) to try to pick up the signals . . . some engineers have snickered at the idea . . . i doubt if any amateur would be able to receive the signals. regards, richard kd6lwd rspear@sookit.jpl.nasa.gov all disclaimers apply ------------------------------ Date: 18 May 1994 22:53:11 GMT From: ihnp4.ucsd.edu!ucsnews!sol.ctr.columbia.edu!howland.reston.ans.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!hyperion.jpl.nasa.gov!laborde@network.ucsd.edu Subject: Mars Observer radio frequencies? To: ham-space@ucsd.edu In article Dave Jacob, jacob@altair.csustan.edu writes: >with ham gear? It seems top me that wh hams are in a unique >position to prove once and for all if this machine is still >working or not. Maybe. JPL's Deep Space Network used 70m dish antennas to listen for MO. What kind of antenna do you have? -Greg ------------------------------ End of Ham-Space Digest V94 #129 ******************************