User's Manual

TY91/TY92 VHF Radio Installation Manual 11 April 2012
00839-00 Issue AA
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20 Trig Avionics Limited
must be connected for communication to work.
There are two sets of TMAP pins on the TY91/TY92, TMAP1 A and B, and
TMAP2 A and B.
On the TY91 and TY92 TMAP1 and TMAP2 are wired together internally.
The two sets are identical, and either pair (TMAP1 or TMAP2) may be used to
connect to the control head.
5.6.3 Headphone Output
The headphone output is intended to drive one or two sets of 300 to 600 ohm
headphones which may be connected in parallel, or to drive a conventional 600
ohm audio panel input.
5.6.4 Controller Power
The TC90 controller does not connect to aircraft power – it receives power
from the TY91/TY92 using this output. The TY91/TY92 provides 12 volts to
the TC90. This output includes short circuit protection, and no fuse is required
between the TY91/TY92 and the TC90.
5.6.5 Power On
The TY91/TY92 power supply is controlled by this discrete input. The input is
active low, so that the TY91/TY92 will power up whenever the input is held
low. This signal is intended to connect to the TC90 Remote ON output.
5.6.6 PTT1/2 Key Input
Two Push to Talk (PTT) inputs are provided, which correspond to the two
microphone inputs. Only the corresponding microphone input is routed to the
transmitter when the key switch is pressed.
The PTT1 input has priority over the PTT2 input – if the PTT1 switch is
closed when the PTT2 switch is closed, the input from Microphone 1 is routed
to the transmitter.
The inputs are active low, and will be asserted when the voltage to ground is