Introduction
The document introduces the TT21 and TT22 Mode S transponders by Trig Avionics, highlighting their compact size and suitability for general aviation, particularly in light sport, gliders, and GA aircraft where panel space is limited. Both models are approved by EASA and the FAA for IFR and VFR use.

Specifications
The TT21 and TT22 are physically identical, featuring a two-part design with a separate control head and transponder box. The control head fits into a 57mm round hole, with a depth of 54mm, and the transponder box can be mounted anywhere within the airframe. The system weighs less than 450 grams and can be powered by an aircraft battery. The TT21 has a power output of 130 watts, while the TT22 outputs 250 watts, making it suitable for high altitude and high-performance aircraft.

Features
Both transponders include a built-in altitude encoder, simplifying installation. They are easy to operate with a control knob and push buttons for Squawk code and Flight ID input. The LCD display is bright and backlit, and the controller is splash-proof, suitable for open cockpit flying. A quick-release latch allows easy removal of the main hardware unit.

Performance and Compliance
The TT21 and TT22 provide class-leading Mode S and 1090ES ADS-B Out capability, enhancing flight safety by increasing visibility to other airspace users. They are certified under ETSO and TSO standards and comply with various aviation regulations. The transponders operate within a temperature range of -40°C to +70°C and do not require a cooling fan.

Support and Purchase
Trig Avionics offers a two-year worldwide warranty through their Approved Trig Dealer network. Customers are advised to purchase through these dealers, with contact information and further details available on the Trig Avionics website.