The modem is implemented in software using a digital signal
processor (DSP). The DSP used is the TMS320C50 from Texas Instruments.
The downlink from the satellite to the ground station has a
data rate of 4.800 - 21.600 bits per second (bps), selectable by command. The uplink has a fixed data rate of 2400 bps. The
modulation of the data is done by a pseudo-noise scrambled
frequency shift keying method.
Modem performance is very close to the theoretical obtainable limit (in
the 1dB range).
Contact person for modem is: Walter Puccio