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Mode S Transponder for Light Aviation
The TT21 is a two part transponder system, which includes an integrated altitude encoder. In design and technology the TT21 is identical to the TT22; the only difference is that the transmitted output power of the TT21 is lower, qualifying the unit as a Class 2 transponder. Class 2 transponders may be used on aircraft cruising slower than 175 knots, and operating below 15,000 feet, IFR or VFR.
The TT22 system is Trig's smallest, lightest, Mode S general aviation transponder. The front panel controller is smaller than a standard instrument, and the remote transponder is not much bigger than a pack of cards. It can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.
The TT31 is a power-efficient, inexpensive, Mode S transponder that meets the European elementary surveillance requirements. The TT31 fits in the same mounting tray as the KT76A transponder, making it a great choice for either upgrades or new installations.