Garmin GMA 347 Installation Manual page 20

2.5.2 Software Configuration Options
The following list shows the software configurations available for the GMA 347. Configuration program
instructions are found in section 5.
Function and Purpose
Audio Inputs. Allow or disable the
use of external receivers
Defeate the (MASQ) Master
Squelch feature
Telephone. Remove telephone
capability
Sidetone. Disable the sound of
transmission in the headset
COM MUTE ON TX
COM MUTE ON RX
Audio level. Volume control
adjustment
Marker Threshold
ICS Mute
Record Com2
2.5.1 Transmit Interlock and Split COM Operation
Garmin makes no expressed or implied guarantees regarding the
suitability of the Split COM feature in any given installation.
In small aircraft, COM and Nav receiver interference is affected by both the distance between antennas
and the tuned frequency separation.
With transmit interlock activated in either the GMA 347 or the COM transceivers, Split COM operation
between a flight crew of more than one pilot is affected.
In aircraft that have a transmit interlock feature, when either transmitter is keyed, all other receivers are
muted so that they won't pick up interference from the active COM transmitter. This is the preferred
option for single pilot operation.
For aircraft with two flight crew members, transmit-interlock would probably interfere with
communications. When the pilot or the copilot transmit, no audio is heard on any other receiver. This
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Revision A
Software Configuration
Enable or Disable DME, ADF, COM3, Play, PA,
SPKR, TEL, and Split COM
Deactivate MASQ
Disable Telephone Channel
Enable or Disable Sidetone
Can be disabled. Audio on unselected COMs is
muted while the selected COM is transmitting
audio
Can be disabled. Audio on unselected COMs is
muted while the selected COM is receiving audio
Adjust Audio level of Music 1 and Music 2,
Unswitched 1, Unswitched 2, Unswitched 3 and
Altitude Warning, SPKR, Pilot and Copilot Mic
Volume, Master Squelch Threshold, and Marker
volume
Marker Beacon threshold levels are adjustable for
HI and LO sense
ICS Muting of Music 1 can be enabled or disabled
Pilot or Copilot COM recording. During the Split
Com mode, COM 1 or COM 2 audio can be
selected for voice recording and playback
NOTE
GMA 347 Installation Manual
190-00325-01