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% % (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.
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% 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.
% (3) GMA 340 Intercom Functions
% Intercom volume and squelch (VOX) are adjusted using the following front panel knobs:
%) LEFT SMALL KNOB (5) - Unit on/off power control and Pilot ICS volume. Full counter-% clockwise DETENT position OFF.
%) LEFT LARGE KNOB (6) - Pilot ICS mic VOX squelch level. Clockwise rotation increases the % amount of mic audio (VOX level) required to break squelch. Full counter-clockwise is the 'hot % mic' position.
%) RIGHT SMALL KNOB (7) - IN position: Copilot ICS volume. OUT position: Passenger ICS % volume.
%) RIGHT LARGE KNOB (8)- Copilot and passenger mic VOX squelch level: clockwise rotation % increases the amount of mic audio (VOX level) required to break squelch. Fully counter-% clockwise is the 'hot mic' position.
% Each microphone input has a dedicated VOX circuit to ensure that only the active % microphone(s) is/are heard when squelch is broken. After the operator has stopped talking, the % intercom channel remains momentarily open to avoid closure between words or normal pauses.
%

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% The GMA 340 provides three intercom modes: PILOT, CREW and ALL. The mode selection % is accomplished using the PILOT (10) and CREW (9) buttons.
% These modes allow different degrees of interaction between the crew and passengers:
%) PILOT mode isolates the pilot from everyone else and dedicates the airplane radios to the % pilot exclusively. The copilot and passengers share communication between themselves but % cannot communicate with the pilot or hear the airplane radios.
%) CREW mode places the pilot and copilot on a common ICS communication channel. The % passengers are on their own intercom channel and can communicate with each other, but % cannot communicate with the crew or hear the airplane radios.
%) ALL mode allows full intercom communication between everyone plugged into the GMA % 340. Airplane radios are heard by all.
% (4) GMA 340 Marker Beacon Receiver Operation
% The marker beacon receiver has visual and audio indicators to show when the airplane passes % over a beacon transmitter.
　
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