Based in Edinburgh, Scotland, Trig are specialists in low power, high tech solutions to existing and emerging requirements in general aviation avionics.                                                                                                                              For further information please visit their website by clicking on their logo at the bottom of this page.

TT21 Mode-S Transponder

TT21 Mode S TransponderWith a front panel controller smaller than a standard instrument, and a remote transponder that is not much bigger than a pack of cards, the TT21 can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.                                                                                 Low Weight - less than 500 grams!                                                                                                                                  Minimal Panel Space                                                                                                                                                                    Low Power Consumption                                                                                                                                                           130 Watts Nominal Output                                                                                                                                            Integrated Altitude Encoder                                                                                                                                                    Simple Installation                                                                                                                                                               Support for 1090ES ADS-B Out

The TT21 can be mounted in a standard 57 mm (2¼ inch) instrument hole, or where space is really tight, in a compact mounting just 42 mm high.

TT31 Mode-S Transponder

TT31 Mode S TransponderThe 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.                                                    European Mode S                                                                                                                                                                      Low Power Consumption                                                                                                                                                            No Cavity Tube                                                                                                                                                                               240 Watts Nominal Output                                                                                                                                                           Plug and Play Installation                                                                                                                                                          Backlit LCD Display                                                                                                                                                                  Easy to Use Rotary Knobs                                                                                                                                            Timer/Stopwatch Function                                                                                                                                                Altitude Monitor                                                                                                                                                                     Certified 1090ES ADS-B out