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Re: COMSAT PORTABLE SATELLITE UPLINK SYSTEM



INMARSAT-A uses wideband FM (15 Khz deviation) for voice and BPSK for TTY
data and around 40 Watts of RF power. I'm not that familiar with the TCS
design but it may be possible to get the power amp to generate some
significant power on 1296 MHz. Unfortunately, it is a class C amplifier. You
will definately have to get around the internal diplexer. These terminals
transmitted at 1.6 GHz. and receive at 1.5 GHz.  The whole INMARSAT system
is only about 36 MHz. wide, so everything inside will be relatively
narrowband (i.e. single transponder).  I'm sure the L.O.'s would be useful
for something as well.  Personally, I don't think it will be worth the money
once the bidding is over.

Howie
AB2S
----- Original Message -----
From: "David Lennig" <lennigde@muohio.edu>
To: <amsat-bb@AMSAT.Org>
Sent: Thursday, April 05, 2001 7:18 AM
Subject: Re: [amsat-bb] COMSAT PORTABLE SATELLITE UPLINK SYSTEM


> Yes, by "interesting" I meant adaptable for Ham usage.
>
> 1.6Ghz, eh... could the transmitter be tweaked for L-band?
> >From the heat sinks visible in the picture, it must be "high" power.
>
> Anyone know what modulation scheme it uses? Probably FM?
>
> ----
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