Forum: GNU Radio building an amateur satellite radio with gnuradio

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Add0936dd84978ef22c604c7af4fefe7?d=identicon&s=25 Andrew Harris (Guest)
on 2008-11-04 14:24
(Received via mailing list)
Hello,

   I'm looking for some advice on what parts to buy from Minicircuits
for my particular application.  I am looking into using GNU Radio and
the USRP (v1) to make an amateur satellite radio suitable for 9600 bps
(data-only) communication with the AO-51 Echo amateur radio satellite.
 I'm focusing on building a radio that transmits on 1268.700 MHz and
receives on 435.150 MHz, so I know I'd need two daughterboards for the
USRP -- the RFX1200 and the RFX400. respectively.  I am looking for at
least 10 watts on the L-band uplink from what I can tell from the
AO-51 email list.

  I have gone to the Minicircuits site, but there are so many
amplifier parts, VCOs, etc, and have no idea what I would really need.
 I think I'll need a preamp on the receiving antenna, and an amplifier
on the transmitter side, but I don't seem to see any "preamplifiers"
on the MiniCircuits site at all, so I can only assume that
preamplifiers are just amplifiers with a few special characteristics.
And there are amplifiers that cover a much wider band than I really
need, so I'm not sure what I might need.

  I was actually surprised to find some GNU Radio software that
implements the G3RUH modem for 9600 bps data communication (
http://digilander.libero.it/iz2eeq/gnuradio.html ), so I think I've
got something to start with there.

   Any help would be appreciated.

-andrew
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