The SSTRX-3000 TM/TC Unit provides the full-duplex telemetry and telecommand interface between the satellite and its ground station. The SSTRX-3000 TM/TC Unit has been designed specifically as a compact, low cost unit for use with low-earth-orbit (LEO) satellites. It operates in S-Band, is fully redundant, and is compliant with ECSS/CCSDS Standards. The SSTRX-3000 TM/TC Unit comprises two Transceivers and an RFDU (diplexers and hybrid) in a small and compact form factor. Overall weight is approx.. 7 kgs. The unit is finished in a flat black polyurethane coating (Aeroglaze Z306 / Z307), but can be delivered also with other finishes. RF connectors are nonmagnetic, Type SMA, Supply, Data/Monitor and HP-Command connectors are non-magnetic, HD sub-miniature. The receiver and transmitter are supplied via separate DC/DC-converters, fed via EMI-Filters to reduce reflected ripple current to within the limits set by MIL-STD-461C.

RFDU

A typical RFDU comprises two diplexing filters to enable the TM/TC Units to transmit and receive using one communications link and a 3 dB hybrid to connect the diplexer to the two antennas, e.g. for omni-directional coverage. Further configuration arrangements would be available upon request.

RECEIVERS

The receiver accepts an up-link signal in the frequency range 2,025 to 2,110 MHz. The up-link modulation can be 2/4 kbps on 8/16 kHz subcarrier, SP-L or BPSK (QPSK) at data rates from 2 kbps up to 256 kbps (1 Mbps). The receivers are optimized for low power consumption in the order of 4 Watts, typical.

TRANSMITTERS

The transmitter provides a down-link carrier in the frequency band 2,200 to 2,290 MHz, phase-modulated by the telemetry data in either SP-L, BPSK or (O)QPSK. DVB-S2 over CCSDS could be made available. Data rates from 10 kHz up to 6 Mbps with output power in range +20 dBm to +33 dBm at the antenna port(s) are available.