[amsat-bb] Re: Allocations in L-band

[Greg D]

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-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of Trevor .
> Sent: Tuesday, November 20, 2012 4:10 AM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Re: Allocations in L-band
>
> --- On Mon, 19/11/12, Richard Ferryman<g4bbh at 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
>
>
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