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- Date: Sat, 6 Aug 94 04:30:30 PDT
- From: Ham-Space Mailing List and Newsgroup <ham-space@ucsd.edu>
- Errors-To: Ham-Space-Errors@UCSD.Edu
- Reply-To: Ham-Space@UCSD.Edu
- Precedence: Bulk
- Subject: Ham-Space Digest V94 #216
- To: Ham-Space
-
-
- Ham-Space Digest Sat, 6 Aug 94 Volume 94 : Issue 216
-
- Today's Topics:
- GPS Freq and antenna questions
- Info request
- Oscar 10 questions
- Request for info.
-
- Send Replies or notes for publication to: <Ham-Space@UCSD.Edu>
- Send subscription requests to: <Ham-Space-REQUEST@UCSD.Edu>
- 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: 4 Aug 1994 18:50:22 GMT
- From: ihnp4.ucsd.edu!ucsnews!newshub.sdsu.edu!nic-nac.CSU.net!usc!math.ohio-state.edu!howland.reston.ans.net!noc.near.net!ctron-news.ctron.com!dur-news.ctron.com!gdelong@network.ucsd.edu
- Subject: GPS Freq and antenna questions
- To: ham-space@ucsd.edu
-
- I broke down and bought a hand held GPS unit (GARMIN GPS-45)
- and am interested is setting it up for land mobile in the
- car.
-
- The manufacturer sells an external, temp mount antenna for
- more than a few dollars, so I plan to try to throw something
- together.
-
- The questions: What freq range(s) do the GPS transmiters use?
- and, is there anything "special" in the antennas made for
- use with this units? ( circular pol? )
-
- Thanks for any help.
-
- --Gary
- N1BIP
-
- ------------------------------
-
- Date: 5 Aug 1994 19:03:18 GMT
- From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!europa.eng.gtefsd.com!darwin.sura.net!huelen!manutara!itata.disca.utfsm.cl!rod@network.ucsd.edu
- Subject: Info request
- To: ham-space@ucsd.edu
-
- 'lo all...
- I guess this *must* be a FAQ... but I'm still looking for some
- info and nothing have happened.
- I'm just starting withn amateur-satellites and I'm looking for some
- info to know what I have to do to work properly.
- I've been hearing doved for some days... but now I want something
- new. Anything will be very usefull so if you have some info please
- e-mail me or post it in news.
- Thanks in advance....
- 73 & DX from Chile....
-
-
-
- Rodrigo E. Rodriguez.
- CE 6 NUG
- rod@itata.disca.utfsm.cl
- rrodrigu@loa.disca.utfsm.cl
-
- ------------------------------
-
- Date: Fri, 5 Aug 1994 19:29:06 GMT
- From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!gatech!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!unixg.ubc.ca!quartz.ucs.ualberta.ca!gov.nt.ca!ve8ev@network.ucsd.edu
- Subject: Oscar 10 questions
- To: ham-space@ucsd.edu
-
- In article <9408021550.ZM27670@SALCIUS2> Wayne_Estes@csg.mot.com (Wayne_Estes) writes:
- >Question #1:
- >
- >The Satellite Experimenter's Handbook says not to use Oscar 10 if the beason
- >doesn't transmit a pure tone. On Sunday night the beacon sounded very
- >distorted. As an experiment I tried sending a CQ in the passband and could
- >hear myself on the downlink loud and clear. (nobody else was on the
- >satellite)
- >
- >Question #1:
- >Is it really true that I should avoid transmitting to Oscar 10 when the
- >beacon does not transmit a pure tone?
- >
- >
- >Instant Track indicates that the Oscar 10 antennas are almost always severely
- >off-pointed from earth (more than 90 degrees most of the time)
- >
- >Question #2:
- >Are the Oscar 10 antennas omnidirectional enough to allow reliable contacts
- >when the offpointing angle is large?
- >
- > - Wayne Estes WD5FFH wayne@csg.mot.com
- >
- >--
- >Wayne A. Estes
- >Motorola Asia-Pacific Cellular Subscriber Division
- >600 N. U.S. Hwy. 45, Rm. A-S345
- >Libertyville, IL 60048-1286
- >PHONE: 1-708-523-2386 Z-MAIL: wayne@csg.mot.com
- >FAX: 1-708-523-8795 POST: w10191@email.mot.com
-
- When the beacon on AO-10 starts FM'ing it usually indicates that the
- system voltage is getting lower. In order to conserve the batteries
- it is a good idea not to use the transponder. The fact that most
- people observe this and that AO-10 is usually pretty quiet (few
- users) has contributed to its continued operation. How it will
- survive between the crash of AO-13 and the launch of the new P3D
- satellite remains to be seen. I imagine it will see a lot of
- use as the only high orbit bird available during this time.
-
- Since the computer on AO-10 succumbed to radiation a few years
- ago, there is no way for ground controllers to change the
- spacecraft's orientation. As the orientation slowly drifts the
- pointing angle as well as the percentage of sun striking the solar
- panels also changes. This is why the strength of the downlink
- varies considerably month to month depending on the antenna
- direction and the amount of power available to charge the batteries.
- It is possible, based on the last known attitude of AO-10 to
- calculate the current and future attitudes. Currently the
- ALON/ALAT are approx. 218/-15 with an illumination of 87% (info
- courtesy G3RUH). The illumination will decline over the next
- two months, down to 11% in October. By January it will be back
- up to almost 100% and will continue on this 6 month cycle.
- The ALON is slowly decreasing (201 in Jan) and the ALAT is slowly
- increasing (-19 in Jan).
-
- Perhaps NASA will donate a shuttle mission to replace the computer
- with a newer radiation-hardened unit? <g>
-
- 73
-
- =============================================================
- John Boudreau VE8EV INTERNET: ve8ev@amsat.org
- Inuvik, NWT, CANADA PACKET: VE8EV@KL7GNG.#NAK.AK.USA.NA
- =============================================================
-
- ------------------------------
-
- Date: 5 Aug 1994 13:13:45 GMT
- From: ihnp4.ucsd.edu!news.acns.nwu.edu!math.ohio-state.edu!howland.reston.ans.net!spool.mu.edu!darwin.sura.net!huelen!manutara!itata.disca.utfsm.cl!rod@network.ucsd.edu
- Subject: Request for info.
- To: ham-space@ucsd.edu
-
-
-
- ------------------------------
-
- End of Ham-Space Digest V94 #216
- ******************************
-