MT2000 Mobile Terminal / Security   The MT2000 signal format is an LPI
(Low Probability of Interception) design:

0.5 second burst spread spectrum (originally designed by military for anti-jamming purposes);
On-the-air packet format is VISTAR proprietary;
Each MT2000 has 3 unique id codes for communication authentication:
           serial #, forward link id, return link id
MT2000 can be upgraded for additional payload encryption.
Receive Frequency: 1525-1559 MHz (L-Band)
GPS Receive Frequency: 1575.42 + or - 1 MHz (L-Band)
Transmit Frequency 1626.5 - 1660.5 MHz (L-Band)
Transmit Power: -4.0 dBW EIRP (nom) for all elevation angles between 0° and 60°.