Hi Greg, KO6TH For the history no OSCAR satellite carried on a Mode-L Beacon.
OSCAR-7 carried on a Mode-S beacon on 2304.1 MHz built by the San Bernardino Microwave Society but it was never officially turned on because of international treaty constraints (bandplan) so that it was not receiving the autorization by the FCC 73" de i8CVS Domenico ----- Original Message ----- From: "Greg D" <ko6th.g...@gmail.com> To: <apbid...@mailaps.org> Cc: "AMSAT-BB" <amsat-bb@amsat.org> Sent: Wednesday, November 21, 2012 5:31 AM Subject: [amsat-bb] Re: Allocations in L-band > I believe it was Oscar-7. > > Greg KO6TH > > > Alan wrote: > > Someone years ago told me that one of the early amateur satellites had a > > mode-L beacon, but because the rules changed, it was never turned on. I > > haven't been able to verify or disprove this story. > > > > Alan > > WA4SCA > > > > > > -----Original Message----- > > From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On > > Behalf Of Trevor . > > Sent: Tuesday, November 20, 2012 4:10 AM > > To: amsat-bb@amsat.org > > Subject: [amsat-bb] Re: Allocations in L-band > > > > --- On Mon, 19/11/12, Richard Ferryman<g4...@btinternet.com> wrote: > >> Just curious - Can someone enlighten me as to why there is no allocation > >> for satellite downlinks in L-band (at least in the bandplans I have seen). > >> There are uplinks around 1267 to 1269 MHz. Is it due to possibility of > >> interference with commercial/military/aeronautical systems? > > I believe it dates back to a WARC conference in about 1971. Prior to that > > the Amateur Service had I believe been able to use any Amateur Frequencies > > just as they can still do for that other form of Space Communication - Moon > > Bounce (EME). > > > > Wayne Green W2NSD does make references to the loss of satellite frequencies > > a few times in his column in 73 Magazine from that era, see 73 Mag archive > > at http://archive.org/search.php?query=73%20magazine > > > > Although a separate service, the Amateur-satellite Service, was created they > > were only given access a limited sub-set of the Amateur Service frequencies. > > For the UHF and Microwave bands the satellite segments were all remote from > > the terrestrial weak-signal segment meaning separate equipment had to be > > built to work satellites. Back in those days even 435 MHz would have seemed > > "remote" from the 432 MHz weak-signal area due to the use of 28 to 432 MHz > > transvertors that only covered a narrow 2 MHz segment of the band. We share > > 432-438 MHz with commercial SAR satellites but why in the 70's we weren't > > allowed to use the whole of 432-438 I do not know. Maybe no-one thought to > > ask for the whole segment ? > > > > The same with 1260-1270, why it's there I don't know perhaps someone can > > enlighten us. The band 1260-1300 MHz is used for wideband Global Positioning > > transmissions from Galileo, see > > http://www.southgatearc.org/articles/galileo.htm > > > > Do restrictions that were applied to the Amateur-satellite Service 40 years > > ago (but not to Moonbounce) still have any relevance today ? again I don't > > know. > > > > Ideally the Amateur-satellite Service should have access to the weak-signal > > segments of all the UHF and Microwave bands for both Earth-to-Space and > > Space-to-Earth so we would only need to build one set of equipment on each > > band for both terrestrial and satellite working. It would be good if IARU > > were to work towards that objective. > > > > 73 Trevor M5AKA > > > > > > _______________________________________________ > > Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. > > Not an AMSAT-NA member? Join now to support the amateur satellite program! > > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > > > > > _______________________________________________ > > Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. > > Not an AMSAT-NA member? Join now to support the amateur satellite program! > > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > _______________________________________________ > Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
