TT31 Transponder Installation Manual 1 February 2010
00455-00 Issue AJ
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Altitude encoder. You require an encoding altimeter or a blind encoder with either parallel
Gray code or RS232 serial output. For best results, and simpler installation, an encoder with a
serial output is recommended.
Cables. You need to supply and fabricate all required cables. Guidance on cable types is
given in section 5 below.
Fixings. To secure the transponder tray to the airframe you will need at least 6 flat head screws
and six self-locking nuts. If the aircraft does not have existing mounting provisions you may
need to fabricate additional brackets to support the transponder tray.
To support the optional ADS-B features a GPS receiver with an appropriate serial output is required.
To support the optional TIS features a display with an appropriate serial input is required.
Page 6 Trig Avionics Limited
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