Garmin GMA 347 Pilot’s Guide
190-00325-00 Rev. A
7
Description
Telephone
The GMA 347 provides a 2-way telephone interface.
Operation depends on the state of the
TEL
key and ICS
mode. See the ICS Isolation Modes & Telephone Distribu-
tion table in the operation section of this manual. Tele-
phone communication is much like using the intercom,
allowing both parties to talk at once.
The TEL channel may be disabled in Configuration mode.
Contact a Garmin-authorized service center for details.
Auxiliary Entertainment Inputs
The GMA 347 provides two stereo entertainment inputs;
MUSIC 1 and MUSIC 2. Two 3.5 mm stereo phone jacks
should be installed in a convenient location for this purpose.
These inputs are compatible with popular portable entertain-
ment devices such as MP3 and CD players. The headphone
outputs of these devices are plugged into the MUSIC 1 or MU-
SIC 2 jacks.
Only the pilot and copilot hear MUSIC 1. MUSIC 2 is a
non-muted input heard only by the passengers. MUSIC 1 and
MUSIC 2 characteristics are affected by the active intercom
mode. Refer to the ICS Isolation Modes and Telephone Dis-
tribution table.
MUSIC 1 is always soft-muted when an interruption occurs
from an aircraft radio. Soft muting is the gradual return of
MUSIC 1 to its original volume level. When the
MKR/MUTE
key is pressed and held for two seconds, the pilot hears two
beeps to indicate that MUSIC 1 muting by COM has been dis-
abled. Pressing and holding the
MKR/MUTE
key again for
two seconds sends one beep to the pilot to indicate COM mut-
ing is restored.
MUSIC 1 can also be configured to mute during ICS activ-
ity. Contact a Garmin-authorized service center to configure
MUSIC 1 muting by the ICS.
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