Transcal SSD120-30N Altitude Encoder (304225)

 The SSD-120 altitude encoder converts pressure altitude into the digital data set forth in the International (ICAO) Standard for SSR Pressure Altitude Transmission. TSO-C88a approved. In operation, with the encoder connected to the aircraft's transponder in mode "C" operation, and interrogated by an air traffic control station, the transponder will utilize the encoder data to reply with the aircraft's altitude referenced to 29.92 In. Hg. (1013 MB.) Dual RS-232 allows interface to your GPS system.