Section 2: COM Frequency
2.1 OVERVIEW
The G1000 COM radios operate in the aviation fre-
quency band of 118.000 to 136.990 MHz with either
25 kHz or 8.33 kHz channel spacing.
!
NOTE: COM channel spacing can be confi gured
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
Transceivers ( COM1 and COM2) and displays the follow-
ing information:
• COM1 and COM2 active and standby frequencies
• Color-coded indication of the selected COM radio
• Indication of signal reception and transmission
!
NOTE: In split COM mode, both COM1 and
COM2 active frequencies are selected and thus
displayed in green.
2.2 VOLUME
Volume level for the COM radios can be adjusted
using the VOL/PUSH SQ knob (top knob on the right
side of the display) located above the COM Frequency
Toggle key. Turning the VOL/PUSH SQ knob clockwise
increases volume level, while turning this knob counter-
clockwise decreases volume level.
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Garmin G1000 VHF NAV/COM Pilot's Guide
2.3 AUTOMATIC SQUELCH
Automatic squelch provides maximum sensitivity
to weaker signals while canceling most localized noise
sources. 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
fi elds of this radio.
Figure 2-1 Overriding Automatic Squelch
!
NOTE: Pressing the VOL/PUSH SQ knob when
automatic squelch is disabled reactivates the
automatic squelch function.
2.4 SWITCHING THE TUNING BOX
BETWEEN COM RADIOS
Pressing the COM knob toggles the frequency tuning
box between the COM1 and COM2 fi elds.
!
NOTE: When a different COM MIC is selected on
the audio panel, the frequency tuning box also
moves on both the PFD and MFD.
Pushing the COM knob switches the tuning
box from one COM radio to the other.
Figure 2-2 Switching COM Radios
OPERATION – COM
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