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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

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