Power-Up; Mono/Stereo Headsets; Transceivers - Garmin GMA 350H Pilot's Manual

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. During installation, the unit may be configured in various
ways depending on aircraft type and the needs of the pilot.

POWER-UP

The GMA 350H/350Hc 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. For the GMA 350H/350Hc
Traffic unit, the TRFC audio is automatically enabled when the unit is
powered-up, regardless of its state prior to the power cycle.

MONO/STEREO HEADSETS

Stereo headsets are recommended when using the GMA 350H/350Hc.
Using a monaural headset in a stereo jack shorts the right headset channel
output to ground. While this does not damage the Audio Panel, a person
listening on a monaural headset hears only the left channel in both ears.
If a monaural headset is used at one of the passenger positions, any other
passenger using a stereo headset hears audio in the left ear only.

TRANSCEIVERS

Transceiver functions may also be accessed via Voice Recognition
NOTE:
commands. Refer to the Voice Recognition section for more information.
Audio from the #1, #2, or #3 COM receiver can be selected independently by
pressing the respective Key(s) (COM1, COM2, or COM3).
Pressing MIC1, MIC2, or MIC3 selects the #1, #2, or #3 transmitter and
simultaneously selects the related COM receiver (COM1, COM2, or COM3)
allowing received audio to be heard. The remaining COM receivers can be added
by pressing their respective keys. During reception of audio from the COM radio
selected for transmission, audio from the other COM radio(s) are muted.
190-01134-14 Rev. L Garmin GMA 350H/350Hc Pilot's Guide
GMA 350H/350Hc Audio Panel
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