TMA44 Audio Panel Installation Manual
7 November 2017
01849-00 Issue
AB
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Trig Avionics Limited
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8.8 Split Mode
Pressing both XMT1 and XMT2 buttons at the same time puts the TMA44
into Split mode; all four COM and XMT indicators will light up. This
connects the pilot to Com 1 and the co-pilot to Com 2, and they can use their
respective radios independently. The passengers will not hear the radios or
crew intercom in Split mode.
Press either XMT button to exit Split mode.
It is not possible to place the pilot on Com 2 and the co-pilot on Com 1.
In Split mode only the pilot will hear the selected navigation audio.
An example of this feature is when the pilot may want to talk to Air Traffic
Control, while the co-pilot may be speaking to ground handling agents.
Note: Due to the nature of VHF communications signals, and the
size constraints in general aviation aircraft, it is probable that
there will be some transmission bleedover in Split Mode,
particularly on adjacent frequencies. Split Mode may not be
suitable in all aircraft conditions.
8.9 Intercom Volume
Turning the volume control knob (the smaller, inner knob on the left side of
the audio panel) adjusts the intercom volume in all headphones for pilot, co-
pilot, and passengers. It has no effect on selected radio audio or music levels.
Many general aviation headsets have a built-in volume control, so volume can
also be adjusted locally.
8.10 Intercom Squelch
The TMA44 provides a single VOX squelch control for the pilot, co-pilot and
the passengers, although each microphone input has its own squelch circuit.
Only the microphones spoken into will be open, thus reducing the amount of
background noise.
With the engine running, set the VOX squelch by slowly rotating the SQ
