User's Manual

TY91/TY92 VHF Radio Installation Manual 11 April 2012
00839-00 Issue AA
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32 Trig Avionics Limited
6.2.2 Intercom Squelch
The intercom includes a voice activated squelch control to limit the
background noise heard over the intercom. Increasing the squelch level
requires a louder microphone input to gate the intercom.
6.2.3 Auxiliary Input Volume
The auxiliary input is a low-fidelity monophonic input intended for nav radio
ident inputs and simple annunciators. This setting controls the relative volume
of the auxiliary audio input.
6.2.4 Auxiliary Input Muting
This allows the auxiliary input to be muted when the radio is receiving or
transmitting speech. Turn this feature ON if the auxiliary input is being used
for non-essential services, like an MP3 player. Turn this feature OFF if the
auxiliary input is being used for essential services like annunciators or traffic
alerts.
6.2.5 Sidetone Volume
The audio sidetone is the transmitted audio signal; this setting controls the level
of the sidetone in the headphones.
6.2.6 Receiver Squelch Offset
The receiver has a factory set nominal squelch point of approximately -95 dBm
which should be appropriate for most installations. In some aircraft with noisy
electrical environments, such as vintage or experimental aircraft, the factory
setting may lead to nuisance squelch changes triggered by noise.
The receiver squelch offset allows the installer to moderately increase the
squelch set point.