User's Manual

TY91/TY92 VHF Radio Installation Manual 11 April 2012
00839-00 Issue AA
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Trig Avionics Limited 19
17
Intercom Key
Input
18
Transmit Interlock
Input
19
Ground
-
20
Aux Audio
Input
21
Microphone 2
Input
22
Ground
-
23
Microphone 1
Input
24
Aircraft Power (DC)
-
25
Aircraft Power (DC)
-
The following diagram shows the connector orientation as viewed from the
wiring side.
5.6 TY91/TY92 VHF Radio Interface Details
5.6.1 Speaker Output
The speaker output can drive a 4 ohm or 8 ohm cabin speaker. The speaker
should be rated at 4 watts or higher.
5.6.2 TMAP Bus
TMAP is a Trig proprietary bus based on RS485 signalling. It provides a bi-
directional interface between the VHF radio and the control head. Each TMAP
interface comprises a balanced pair of signals, called A and B, both of which