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Re: Mobile, FM and GEO... why ?



Got a broken image link, and when I tried to open the image directly, 
got a VERY funny 404 ..

On Thursday, Aug 7, 2003, at 15:04 US/Central, William Leijenaar wrote:

> Hi AMSATs,
>
> I'm still wondering why amateurs want to have an FM mobile connection 
> via a GEO satellite.
> From experience with my portable satellite station I can tell you that 
> even the LEO's are not really easy to work, and definatly not in an 
> city.
>
> The station is a back-pack station with 20W on 2m and 10W on 70cm and 
> an self-made (arrow alike) 2m/70cm handheld antenna. On my web-page 
> you can see that it has been used through whole Europe :-)
>
> Now back to the GEO. The downlink may be compairable with the AO40 or 
> Ao10 downlinks. Ao10 has abt 50W PEP and Ao40 on 13cm has 50W too. We 
> all know how these downlink signals are, not very strong for an FM 
> downlink. Via Ao10 I have done many tests including FM tests. (A 
> transponder is ideal for testing different kind of modulations) and 
> even with 120W PEP and 32el. RHCP yagi on the uplink I got none 
> readable signals back. With SSB no problems.
>
> So how you want to do this with a mobile station, having less power, 
> less antenna gain and lot of interference and reflections of nearby 
> buildings. On the other hand it is also a huge problem with operation. 
> Local FM repeaters are a good example of it (in my country I notice 
> this often) that none-mobile stations occupy the relais and use it as 
> chat box, while mobile/portable stations have to wait till they 
> finally switch of the ptt switch after hearing a long long story.
>
> What about some kind of international round, where people all around 
> the world can log in and talk about their experiments. Then the 
> GEO-sat could be switched on at a particulair time and after the round 
> it can be switched of. To avoid time problems, their can be done E.g a 
> round when Europe has evening and later a round when USA has evening 
> (when sat is between EU and USA).
> Only a few round-leaders are needed in the several continents that 
> control the round and keep the topic at a good level.
>
> Just an idea to make the crowdy FM more interresting, and to let it 
> contribute to the whole world.
>
> 73 de PE1RAH, William
> ---
>
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> Sent via amsat-bb@amsat.org. Opinions expressed are those of the 
> author.
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>
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