- Low Weight, less than 500 grams
- Minimal Panel Space
- Low Power Consumption
- 250 Watts Nominal Output
- Integrated Altitude Encoder
- Simple Installation
- Easy to Use Rotary Knobs
- Support for ADS-B Out
 

The TT22 system is the smallest, lightest, class 1 Mode S general aviation transponder. This two part system, which includes an integrated altitude encoder, can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.

The front panel controller can be installed in a standard 2¼ inch instrument cut-out, or where space is really tight it can fit a compact cut-out just 45mm high. The TT22 transponder itself is also only 45mm high, and can be installed anywhere convenient in the airframe.

The TT21 transponder is an Class 1 compliant Mode S transponder, with support for extended squitter. It meets all the requirements for Mode S elementary surveillance transponders in Europe for aircraft flying also above 15,000 feet and with airspeeds faster than 175 knots. It can be used for both IFR and VFR flight.

The TT22 also supports 1090 MHz Automatic Dependent Surveillance Broadcast (ADS-B) extended squitter, known as “ADS-B out”. This provides improved airborne surveillance, vital information for airport ground surveillance, and is a key feature of future airspace plans. An appropriate GPS receiver is required to enable the ADS-B capability.

Flexible Installation
The TT22 system can be easily fitted to aircraft even when there are space and weight constraints. The front panel controller fits into any panel, and takes less space than a standard instrument. Only a few centimetres are needed behind the panel to allow room for the connector and the static port interface. This means that the TT22 transponder is not just suitable for conventional light aircraft; it can be fitted into gliders, antique aircraft, and flex-wing microlight panels. The control panel is splash proof for open cockpit installations.

A lightweight cable runs from the control panel to the transponder unit which can mounted anywhere in the aircraft. The transponder unit then connects to the antenna and aircraft power supply. A quick release latch secures the main unit to the mounting tray, allowing it to be easily removed for security.

Operating Controls
The front panel controller has easy to operate rotary controls, and a simple layout. The clear LCD screen shows the Squawk Code, reported Flight Level, and operating mode of the transponder.

An altitude encoder is built into the controller, so no extra boxes are needed to complete the transponder system. Finally, the controller also acts as the configuration module for the combined system. With the controller remaining attached to the aircraft, swapping the TT22 transponder box is possible without needing any reprogramming of airframe settings.

Light Weight
The TT22 system weighs less than 500 grams, with less than 100 grams in the front panel controller. For all aircraft low weight translates into more payload and better efficiency, but for microlight aircraft where certification weight limits are tight the low weight of the TT22 system may make it possible for the first time to fit a transponder.

- Type: Class 1 Mode S
- Certification/Compliance: ETSO 2C112b Class 1 Level 2els, ETSO C166a Class B0, TSO C112c Class 1 Level 2els, TSO C166a Class B0
- Supply Voltage (DC): 10 – 33 V
- Typical Current Consumption: Idle: (at 14V)
- Active: A
- Transmitter Power: 250Watt nominal Output
- Operating Temperature: -20 to +70 C
- Cooling Requirement: No fan required
- Weight: 500 g
- Dimensions Controller: 64 x 45 x 45 mm
- Dimensions Transponder: 62 x 45 x 141 mm

The TT22 connected to an appropriate GPS will make it compliant with the FAA final rule on ADS-B.

Set:

- Trig TT22 Class I
- Connector set for connection between main and control unit
- Adapterset 57mm / square installation shape
- Mounting tray