190-01134-12 Rev. K
Garmin GMA 350/350c Pilot’s Guide
12
GMA 350/350c Audio Panel
FEATURES AND OPERATION
The GMA 350/350c Audio Panel provides the traditional audio selector
functions of microphone and receiver audio selection. The Audio Panel
includes an intercom system (ICS), a marker beacon receiver, and a COM
clearance recorder. Ambient noise from the aircraft radios is reduced by
Avionics Squelch (ASQ). When no audio is detected, ASQ processing further
reduces the amount of background noise. The
MAN SQ
Key toggles between
manual and automatic intercom system (ICS) squelch. In automatic ICS
squelch mode, threshold adjustments are handled automatically by the
system. In manual ICS squelch mode, individual threshold adjustments can
be made for the pilot, copilot, and passenger microphones by the crew. The
ability to adjust individual thresholds for each ICS position further reduces
the amount of background noise from the radios.
Pushbutton keys control audio selection. When a key is selected, a triangular
annunciator above the key is illuminated. Annunciator brightness is adjusted
automatically by photocell dimming. Key brightness is adjusted by the radio
dimming bus control. Three Aux inputs are available for additional avionics
or audio devices.
Upon installation, the unit may be configured in various ways depending
on aircraft type and the needs of the pilot.
POWER-UP
The GMA 350/350c performs a self-test during power-up. During the
self-test all Audio Panel annunciator lights illuminate for approximately two
seconds. Once the self-test is completed, most of the settings are restored to
those in use before the unit was last turned off.
Summary of Contents for GMA 350c
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