Garmin GMA 347 - Manual (Page 9)

Garmin GMA 347 Pilot’s Guide 190-00325-00 Rev. B
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
Distribution table in the operation section of this manual.
Telephone 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 entertainment
devices such as MP3 and CD players. The headphone outputs
of these devices are plugged into the MUSIC 1 or MUSIC 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
Distribution 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
disabled. Pressing and holding the MKR/MUTE key again
for two seconds sends one beep to the pilot to indicate COM
muting is restored. This setting reverts to Mute at the next
power up.
MUSIC 1 can also be configured to mute during ICS activity.
Contact a Garmin-authorized service center to configure
MUSIC 1 muting by the ICS.