TT21/TT22 Transponder Installation Manual
22 August 2017
00560-00
AP
______________________
20
Trig Avionics Limited
TMAP A and B lines on the controller should be connected to the
corresponding A and B lines of either TMAP1 or TMAP2 on the TT21/TT22.
5.8.2
Altitude Out
The TC20 incorporates an altitude encoder. Certain GPS receivers can benefit
from having altitude information supplied to them. The TC20 reports pressure
altitude on this pin as an RS232 serial data format, at 9600 bps, using the
format commonly called “Icarus” or “Garmin” format.
5.8.3
Remote ON
This output is connected directly to the Power/Mode switch on the TC20, and
should be connected to the Power ON discrete input of the TT21/TT22.
5.8.4
Power
The TC20 uses 6.5 volts which is available from the TT21/TT22 transponder.
This input should NOT be connected to aircraft power.
5.9 D Connector Crimp Terminals
The 25 way and 9 way connectors supplied with the TT21/TT22 installation kit
are MIL standard versions of the popular sub miniature D type connector
family, and use individual crimp terminals and a receptacle. The MIL
specification for this family of connectors is MIL-C-24308. We supply crimp
terminals because these are more reliable than soldered connections, and are
easier to assemble in-situ in an aircraft, where soldering is impractical. They
also allow individual wires to be removed and replaced in a receptacle without
replacing the whole connector.
The pin contacts, used in the 25 way connector, conform to MIL part number
M39029/64-369, and are suitable for wire gauges from 20 to 24 AWG.
The socket contacts, used in the 9 way connector, conform to MIL part number
M39029/63-368, and are also suitable for wire gauges from 20 to 24 AWG.
These contacts are widely used in avionics installation, and there are many