The T-740E Transmitter is a rugged, flight-proven Tracking and Data Relay Satellite System (TDRSS) transmitter with successful launches on multiple launch vehicles. It provides the critical connection between a launch vehicle and NASA’s TDRSS for complete telemetry coverage during ascent and staging, alleviating dependence on downrange telemetry gathering stations.
The center frequency of the T-740E transmitter can be set across the TDRSS S-band with simple tuning changes. It uses a low-phase noise temperature-compensated crystal oscillator for the frequency source. Phase noise is less than 5° RMS under vibration conditions experienced during launch. Premodulation shaping of the data is available for optimum spectral containment.
The solid-state power amplifier (SSPA) employs high-efficiency, space-qualified gallium nitride field-effect transistor power devices to generate the 40-watt RF power. Design of the SSPA minimizes compression of the shaped signals over all environments.
