4.2 COM FREQUENCY WINDOW
OVERVIEW
The G1000 COM radios can be tuned either over the
118.000 to 136.975 MHz frequency range with 25 kHz
spacing selected or over the 118.000 to 136.990 MHz fre-
quency range with 8.33 kHz spacing selected.
NOTE: COM channel spacing can be configured
through the MFD, in the System Setup Page of
the AUX Page group.
The Communications Frequency window is located to
the right of the Navigation Status bar, provides the control
and display of dual VHF Radio Communication Trans-
ceivers (COM1 and COM2) and displays the following
information:
• COM1 and COM2 active and standby frequencies
• Color-coded indication of the selected COM radio
• Indication of signal reception and transmission
VOLUME
COM radio volume level can be adjusted from 0 to
100% of available volume (in increments of 3.25 percent-
age points) using the VOL/PUSH SQ knob located above
the COM Frequency Toggle key. Turning the VOL/
PUSH SQ knob clockwise increases volume level for the
COM radio on which the tuning box is placed, while turn-
ing this knob counterclockwise decreases volume level for
this COM radio.
190-00445-00 Rev. A
Garmin G1000 VHF NAV/COM Pilot's Guide for Mooney M20M & M20R
When adjusting volume level for a COM radio, volume
level is displayed in place of the corresponding standby
COM frequency and the associated COM radio name (i.e.,
'COM1' or 'COM2') is replaced by the term 'VOLUME'.
Volume level remains displayed in the COM Frequency
window for a duration of two (2) seconds after volume
level is last changed.
Figure 4.2.1 COM Volume Level
AUTOMATIC SQUELCH
Automatic squelch provides maximum sensitivity to
weaker signals while canceling most localized noise sourc-
es. Automatic squelch can be disabled for a COM radio
by pressing the COM knob to select the desired COM
sub-window, then by pressing the VOL/PUSH SQ knob.
When automatic squelch is disabled for a COM radio,
COM audio remains continuously open and an RX indi-
cation appears between the active and standby frequency
fields of this radio.
Figure 4.2.2 Overriding Automatic Squelch
NOTE: Pressing the VOL/PUSH SQ knob when
automatic squelch is disabled reactivates the
automatic squelch function.
OPERATION – COM
4-5
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