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A green lamp above the button will light indicating which audio source is
selected.
Cockpit Speaker
This button will place all selected audio on the cockpit speaker when active.
Note: In Split mode (see below), only unswitched inputs will play
through the speaker.
To help reduce power consumption and internal heat build-up in the avionics
stack, switch off the speaker when not in use.
Swap Mode
The optional Swap button, usually mounted on the control yoke, switches
between the Com transmitters without having to reach for the audio panel.
Pressing the Swap button has exactly the same effect as switching between
XMT1 and XMT2 on the audio panel.
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.
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.
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.
