The TRIG TT21 is a Mode S transponder with built-in altitude encoder manufactured in the UK. It is a two-part system with compact lightweight head for the instrument panel and the remote-mounted transponder unit. The TT21 is a Class 2 transponder with 130w output and certified for aircraft cruising slower than 175 knots, and operating below 15,000 feet, IFR or VFR. (if you plan to fly over 15,000 feet or over 175 knots, you should use the TT22 transponder listed below)

The front panel controller is smaller than a standard instrument, and the remote transponder is not much bigger than a pack of cards. The TT21 can be mounted in a standard 2¼ inch instrument hole, or where space is really tight, in a compact mounting just 42 mm high. A lightweight cable runs from the control panel to the transponder unit which can be mounted anywhere in the aircraft. The TT21 can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements. The TRIG TT21 is TSO approved.

• low weight - less than 500 grams!
• minimal panel space
• easy to use rotary knobs
• low power consumption
• 130 Watts nominal output
• integrated altitude encoder
• simple installation
• supply voltage (DC): 10v - 33v
• support for 1090ES ADS-B Out
• clear LED display

pricing:   list price... $2659.00   our special price... $2029.00
    (connectors included - prewired wiring harness available for only $160.00)
      TSO'd transponder antenna (photo). . . $45.00

more detailed information... tt21-22-flyer.pdf
TT21-TT22 transponder operator's manual... tt21-22-manual.pdf
TT21-TT22 installation manual... tt21-22-install-manual.pdf

We use the TT21 transponders       in our Aerotrek aircraft
 

The TT22 system is our 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 T22 qualifies as a Class 1 transponder, which are used on high-performance aircraft - those cruising faster than 175 knots and operating above 15,000 feet. The TT22 is fully certified with EASA ETSO and FAA TSO approval for IFR and VFR flight.

• low Weight - less than 500 grams!
• minimal panel space
• easy to use rotary knobs
• low power consumption
• 250 watts nominal output
• integrated altitude encoder
• simple installation
• supply voltage (DC): 10v - 33v
• support for 1090ES ADS-B Out
• clear LED display

The TT22 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.

The TT22 is a Class 1 transponder; a software upgrade and a connection to an appropriate GPS will make it compliant with the FAA final rule on ADS-B. The TT22 is TSO approved for fitting to European and FAA registered aircraft.

pricing:   list price... $2976.00   our special price... $2219.00
    (connectors included - prewired wiring harness available for only $160.00)
      TSO'd transponder antenna (photo). . . $45.00

more detailed information... tt-21-22-flyer.pdf
TT21-TT22 transponder operator's manual... tt21-22-manual.pdf
TT21-TT22 installation manual... tt21-22-install-manual.pdf