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Garmin G1000 Cockpit Reference Guide for Mooney M20M & M20R

SECTION 3 – AUDIO PANEL

COM Swap

The GMA 1347 allows for the use of a remotely mount-

ed switch to alternately transfer the active microphone

between COM1 MIC and COM2 MIC. The COM swap

switch is typically mounted on the yoke or control stick.

If COM1 MIC is the active microphone (i.e., both COM1

MIC and COM1 keys are annunciated), pressing the COM

swap switch transfers the active microphone from COM1

MIC to COM2 MIC (i.e., both COM1 MIC and COM1

keys become deselected, and COM2 MIC and COM2

keys become annunciated). Pressing the switch has no ef

fect if COM3 is the active transceiver or if COM 1/2 (split

COM) is activated.

Please consult a Garmin-authorized service center for

details on the remote COM swap option.

Split COM

Pressing the COM 1/2 key toggles the state of the split

COM function. During split COM operation, the COM1,

COM1 MIC, COM2 and COM2 MIC keys are annunci-

ated and thus active.

When the COM 1/2 key is selected, COM1 becomes

dedicated solely to the pilot for MIC/audio, while

COM2

becomes dedicated to the copilot for MIC/audio. The

COM1 MIC annunciator blinks when the pilot’s micro-

phone is keyed. The COM2 MIC annunciator blinks

when the copilot’s microphone is keyed.

In this mode, both the pilot and the copilot can

simultaneously transmit over separate radios. Note that,

while the pilot can still monitor

COM3, NAV1, NAV2,

DME, ADF, AUX and MKR audio as selected, the copilot is

only able to monitor/hear COM2.

Split COM mode is cancelled by pressing the COM 1/2

key.

NOTE: Split COM performance varies signiﬁcantly

across installations and is affected by both the

distance between the antennas and the separa-

tion of the tuned frequencies. In small aircraft

particularly, receiver sensitivity is typically

reduced and squelch breaks are affected. Each

installation should be individually examined to

determine the expected performance of split

COM.

PA Function

The passenger address function is provided via the PA

key. Push-to-talk (PTT) must be used to deliver PA an-

nouncements.

NOTE: PA volume is adjustable in Conﬁguration

mode.

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