The G1000 VHF NAV/COM frequency controls and
windows are located in the top corners of the Primary
Flight Display (PFD) and Multi Function Display (MFD).
The NAV controls, windows and fields are located on the
left side. The COM controls, windows and fields are on
the right, as shown in the figure below.
NAV
Controls
NAV Frequency WindowCOM Frequency Window
The G1000 VHF NAV/COM interface includes:
• Windows and fields
• Radio selection
• Tuning box
• Frequency Transfer Arrow
• Radio status indications
• Controls
COM
Controls
Figure 4.1.1 G1000 VHF NAV/COM Interface (PFD)
Garmin G1000 VHF NAV/COM Pilot’s Guide for Mooney M20M & M20R190-00445-01 Rev. A
4-1
INTRODUCTION
WINDOWS AND FIELDS
The NAV and COM Frequency windows are located
at the top of the display on either side of the Navigation
Status bar on both the PFD and the MFD.
• The NAV Frequency window is displayed to the left
of the Navigation Status bar.
• The
Each radio frequency window is composed of two
fields, a
• In the NAV Frequency window, the active frequency
• In the COM Frequency window, the active frequency
COM Frequency window is displayed to the
right of the Navigation Status bar.
standby field and an active field.
is on the right side, the standby frequency is on the
left.
is on the left side, the standby frequency is on the
right.
NOTE: In GPS mode, both active NAV frequencies are displayed in white indicating they are
not active.
RADIO SELECTION
The NAV radio is selected with the CDI softkey lo-
cated on the PFD.
• When NAV1 radio is selected, a single green arrow
labeled either ‘VOR1’ or ‘LOC1’ is displayed on the
HSI.
• When NAV2 radio is selected, a double green arrow
labeled either ‘VOR2’ or ‘LOC2’ is displayed on the
HSI.
The active COM radio is selected with the audio panel COM1 MIC or COM2 MIC keys. COM1 MIC key
activates the COM1 transceiver. COM2 MIC key activates COM2.
Frequencies located in the active field are displayed
in either green or white.
• An active frequency displayed in green indicates that
the radio is selected on the audio panel (COM) or
HSI (NAV).
• An active frequency displayed in white indicates that
the radio is not selected on the audio panel (COM)
or the HSI (NAV).
A light blue tuning box appears around the standby
frequency field on both the PFD and MFD. It can be
moved from one standby frequency field to another for
tuning or radio selection by pressing the dual COM or
NAV knob.
Frequencies located in the
in either white or gray.
• The standby frequency appearing in the tuning box
is white.
• The standby frequency that is not in the tuning box
is gray.
Frequency Transfer Arrow
Figure 4.1.3 Frequency Transfer Arrow and Tuning Box
standby field are displayed
Tuning Box
FREQUENCY TRANSFER ARROW
A Frequency Transfer Arrow appears between active
and standby frequencies in both the COM and NAV windows. Pressing the Frequency Transfer
standby and active frequencies. Pressing the dual
key toggles the
COM
or NAV knob transfers both the frequency tuning box and
the Frequency Transfer Arrow between the radios.
NOTE: When a signal is received or transmitted,
the Frequency Transfer Arrow is replaced by a
white RX or TX indication.
RADIO INDICATORS
• RX – When a COM signal is received, a white RX
appears by the active COM frequency during signal
reception.
• TX – When a COM radio is keyed, a white TX
appears by the active COM frequency during transmission.
• ID – When the Morse code identifier is ON for a
NAV radio, a white ID appears to the left of the active
NAV frequency. The Morse code identifier is heard
when a NAV radio is selected on the audio panel.
Garmin G1000 VHF NAV/COM Pilot’s Guide for Mooney M20M & M20R190-00445-01 Rev. A
4-3
INTRODUCTION
CONTROLS
The NAV Frequency window is controlled by knobs
and keys on the left, the COM Frequency window by
knobs and keys on the right.
The NAV controls:
• VOL/PUSH ID knob
– Turn to adjust the NAV radio volume level.
– Press to turn the Morse code ID ON and OFF.
• Frequency Transfer key
– Press to transfer the NAV frequencies between
the active and standby fields.
• Dual
NAV tuning knob
– Turn to tune a NAV frequency in the NAV
tuning box (
large knob for MHz; small knob
for kHz).
– Press to transfer the NAV tuning box between
the NAV1 and NAV2 radios.
The COM controls:
• VOL/PUSH SQ knob
– Turn to adjust the COM radio volume.
– Press to turn automatic squelch ON and OFF.
• Frequency Transfer key
– Press to transfer the COM frequencies between
the active and standby fields.
– Press and hold for two seconds to tune the
emergency frequency (121.500 MHz) in the
active COM field.
• Dual
COM tuning knob
– Turn to tune a COM frequency in the COM
tuning box (large knob for MHz; small knob
for kHz).
The G1000 COM radios can tune either 25 kHz spacing (118.000 to 136.975 MHz) or 8.33 kHz spacing
(118.000 to 136.990 MHz) frequencies.
COM channel spacing is configured through the MFD
on the System Setup Page of the AUX Page group.
VOLUME
COM radio volume level can be adjusted from 0 to
100% in increments of 3.25%, using the VOL/PUSH SQ
knob located above the COM Frequency Transfer key.
Turning the VOL/PUSH SQ knob clockwise increases
volume, turning the knob counterclockwise decreases
volume.
When adjusting volume level for a COM radio, volume
level is displayed in place of the standby COM frequency.
The COM1 or COM2 annunciator is replaced by the word VOLUME. Volume level remains in the COM Frequency
window for two seconds after the change.
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,
mains continuously open and an RX indication appears
while continuous noise is heard over the speaker and
phones.
Figure 4.2.2 Overriding Automatic Squelch
To return to automatic squelch, press the VOL/PUSH
SQ knob again.
COM audio re-
Figure 4.2.1 COM Volume Level
Garmin G1000 VHF NAV/COM Pilot’s Guide for Mooney M20M & M20R190-00445-01 Rev. A
4-5
OPERATION – COM
SWITCHING BETWEEN COM RADIOS
Pressing the dual COM knob transfers the frequency
tuning box between the COM1 and COM2 fields.
NOTE: When a different transceiver (COM MIC
key) is selected on the audio panel, the frequency
tuning box also transfers on both the PFD and
MFD.
Pushing the dual COM knob switches the
tuning box from one COM radio to the other.
Figure 4.2.3 Switching COM Radios
MANUALLY TUNING A COM FREQUENCY
COM frequency manual tuning is done with the dual
COM knob. The frequency is tuned in the standby field.
• The
MHz frequency digits are tuned with the large
COM knob.
TOGGLING COM FREQUENCIES
Pressing the COM Frequency Transfer key toggles
the COM frequencies between the active and standby
fields of the COM radio having the Frequency Transfer Arrow.
Pressing the COM Frequency Transfer
key toggles the COM frequencies.
Figure 4.2.4 Transfering COM Frequencies
SELECTING A COM RADIO
The desired COM radio is selected using the COM
MIC keys on the audio panel. When the COM MIC key
is annunciated, the associated active COM frequency is
displayed in green in the COM Frequency window.
Top section of the
audio panel
4-6
• The
kHz frequency digits are tuned with the small
COM knob.
Turning the knobs clockwise increases frequency.
Turning the knobs counterclockwise decreases frequency.
Garmin G1000 VHF NAV/COM Pilot’s Guide for Mooney M20M & M20R190-00445-01 Rev. A
The COM radio is selected
on the audio panel.
Figure 4.2.5 Selecting a COM Radio
NOTE: Refer to the Audio Panel Pilot’s Guide for
more details on transceiver selection.
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