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Garmin G1000 Cockpit Reference Guide for Mooney M20M & M20R

SECTION 3 – AUDIO PANEL

Transceiver Keys

As illustrated below, the following eight (8) transceiv-

er keys appear at the top of the GMA 1347 front panel:

COM1 MIC, COM2 MIC, COM3 MIC, COM 1/2,

COM1, COM2, COM3, and TEL. COM audio can be

selected by either pressing the desired COM key or by

pressing the corresponding COM MIC key.

NOTE: A PTT switch must be pressed to allow

all microphone transmissions.

Figure 3-2 Transceivers

Pressing a COM MIC Key

Pressing COM1 MIC, COM2 MIC, or COM3 MIC

selects the corresponding radio as the active microphone

source (i.e., as the primary COM radio) and highlights

the corresponding COM frequency in green in the active

frequency ﬁeld of the PFD and MFD.

Only one microphone source can be selected at a time.

Thus, if COM1 MIC is pressed when COM2 MIC is al

ready selected, COM2 MIC is automatically deactivated

and the COM2 MIC annunciator light is turned off. The

corresponding audio selection key (in this case, COM1)

becomes automatically selected if it is not already selected

at the time.

Pressing a COM Key

Pressing COM1, COM2, or COM3 selects the corre-

sponding radio as the active audio source. Each audio

source can be selected independently by pressing COM1,

COM2, or COM3. If selected in this manner, the au-

dio source remains selected independently of the active

microphone source selection. The active COM audio is

always heard through the headsets, and any combination

of audio sources can be selected simultaneously.

During COM signal reception, a white RX inscrip

tion appears next to the corresponding COM frequency

on both the PFD and the MFD for the duration of the

reception.

Keying a Microphone

When a microphone is keyed, the active transceiver

MIC key annunciator blinks approximately once per sec-

ond to indicate that the transmission is active, and a white

TX inscription appears next to the corresponding COM

frequency on both the PFD and the MFD for the duration

of the transmission.

When no further aircraft radio activity is detected by

the unit, the amount of ambient background noise from

the radios is further reduced by the MASQ

(Master Avi-

onics Squelch) circuit (information on MASQ

is present-

ed later in this manual).

NOTE: Audio level of the selected COM radio(s)

is controlled by the COM radio volume control

located on both the PFD and MFD (see G1000

VHF NAV/COM Pilot’s Guide for more informa-

tion).

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