Garmin G3X Installation Manual page 720

The Connection and Active Frequency selections are displayed when any type of communication radio is
connected, these selections are described as follows:
Connection - Used to select which connection the communication radio is connected to.
Active Frequency - Displays the active frequency currently tuned on the selected communication radio.
Garmin Connection
COM to
Radio GDU 4XX
SL30/
RS-232
SL40
GTR 20 CAN Network All
CAN Network All
GTR 200
RS-232
GTR 225/
RS-232
GNC 255
GTN 635/
GTN 650/ RS-232
GTN 750
GNS 4XX/
N/A
GNS 5XX
32.4.21.1 GTR 20 Communication Radio Configuration
For installations using the GTR 20 communication radio, the available options are described in the
following text.
COM Volume - Used to set the received audio volume.
Emergency Volume - Used to set the COM radio volume that will be used if the GTR 20 has
automatically tuned the emergency frequency as a result of losing communication with the G3X system.
Transmit Sidetone - Used to set the volume of the sidetone audio during transmit.
Microphone Gain - Increases or decreases the percent of transmitted modulation which affects the volume
of the received signal, also affects own transmit sidetone.
RF Squelch - Used to set the received signal level required to break squelch. Increasing this setting
increases the signal level required to break squelch. Receiver squelch can be set from 0-10, a setting of 0
(default) represents the factory calibration.
MON Mode On Swap - Setting to Preserve MON will keep the Monitor feature ON when pressing the
Frequency Transfer Key. Setting to Disable MON will turn off the Monitor feature when the Frequency
Transfer Key is pressed.
190-01115-01 G3X/G3X Touch Install Manual - GDU 45X/46X Config and Post Install Checkout
Rev. AA
Table 32-11 COM Radio Supported Functions
COM
Radio Display
Active &
SW
Standy COM
Version
Frequencies
All X
X
X
All X
2.10 or
X
Higher
Other
Versions
6.00 or
X
higher
Other
Versions
N/A
G3X Touch Interface Functions Supported
Tune
Standby Swap COM
COM Frequencies
Frequency
X
X X
X X
X
X X
X
X X
Change Toggle Toggle
COM COM MON
Volume Squelch Mode
X X X
X X
X X X
X X X
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