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following positions:
• ISO (up position). The pilot is connected only to the airplane radio. He is isolated from the
intercom. The co-pilot can communicate with the passengers but the co-pilot can not
make or hear transmissions on the airplane radio.
• ALL (mid position). The pilot, co-pilot and passengers can all hear the radio. Both the
pilots and the passengers can communicate on the intercom.
• CREW (down position). The pilot and co-pilot are connected on one intercom channel
while the passengers are on a separate and independent channel. The pilot and co-pilot
are connected to the airplane radio. Passengers can continue to communicate with
themselves without disturbing the pilot and co-pilot.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-50-00 Page 7
20 Sep 2007
(4) KMA 28 Marker Beacon Receiver Operation
The marker beacon receiver has visual and audio indicators to show when the airplane passes
over a beacon transmitter. Select the MKR push-button to hear the audio from the marker
beacon receiver.
A three-position switch sets the receiver sensitivity. It also has a test function:
) HI (high sensitivity, up position). The receiver will detect the outer marker beacon
approximately 1 mile out.
) LO (low sensitivity, middle position). The receiver will detect the marker beacon more
accurately.
) T/M (test, momentary down position). The spring-loaded down position tests all 3 lights. If
you push the switch down while receiving a beacon signal, it mutes the marker tone
temporarily.
AIRCRAFT
Communications DA 40 Series
AMM
Page 8
20 Sep 2007 23-50-00 Doc # 6.02.01
Rev. 5
Figure 3: Garmin GMA 340 Audio Panel
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-50-00 Page 9
20 Sep 2007
C. Garmin GMA 340 Audio Panel
(1) GMA 340, General
Figure 3 shows the Garmin GMA 340 Audio Panel. It is mounted above the COM/NAV/GPS #1
set in the avionics rack in the instrument panel, see Chapter 31.
The GMA 340 provides flexibility in switching up to three microphone and audio transceiver
communication inputs plus NAV 1, NAV 2, ADF, DME and marker audio. The GMA 340 includes
a voice activated (VOX) intercom system and a three lamp marker beacon receiver and display.
The VOX intercom uses rotary knobs for volume and squelch adjustment while selection of all
other functions is accomplished with the use of push-buttons.
If the power to the system fails, (or if the selector panel is turned off), an Emergency Mode
connects the pilot's headset to COM 1.
Marker HI and LO and button annunciation is accomplished with LED devices. Front panel
backlighting of button function, squelch and volume control knobs is provided by LED's
controlled by the airplane lighting bus.
(2) GMA 340 Audio Selector Functions
Audio level is controlled by the selected NAV radio volume control.
Selection of either COM 1, COM 2, or COM 3 (13) (COM 3 is not used in the DA 40 installation)
for both MIC and audio source is accomplished by pressing either COM 1 MIC, COM 2 MIC, or
COM 3 MIC (14) (COM 3 MIC is not used in the DA 40 installation). The active COM audio is
always heard on the headphones.
Each audio source can be selected independently by pressing COM 1, COM 2, or COM 3 (13)
(COM 3 is not used in the DA 40 installation). When selected in this way, they remain active as
audio sources independently of which transceiver has been selected as the active microphone
source.
When a microphone is keyed, the active transceiver's MIC button LED blinks approximately
once per second to indicate the transmitter is active.
When no airplane radio activity is detected by the GMA 340, the amount of ambient background
noise from the radios is further reduced by the MASQ™ circuit. This processing is also applied
to the NAV radios.
AIRCRAFT
Communications DA 40 Series
AMM
Page 10
20 Sep 2007 23-50-00 Doc # 6.02.01
Rev. 5
Pressing the COM 1/2 button (15) activates the split com function. While this mode is active,
COM 2 is dedicated solely to the copilot as a MIC/audio source while COM 1 is dedicated to the
pilot as a MIC/audio source. The pilot can still listen to COM 3 (COM 3 is not used in the DA 40
installation), NAV 1, NAV 2, DME, ADF, and MKR. The pilot and copilot can simultaneously
transmit in this mode, the pilot transmitting over COM 1 and the copilot transmitting over COM
2. The SPLIT COM mode is canceled by pressing the COM 1/2 button a second time.
Pressing NAV 1, NAV 2, DME, ADF (16), or MKR (2) (see MKR beacon operation) selects that
audio source. A second button press deselects the audio source.
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