User manual GARMIN GMA 340 AUDIO PANEL PILOT'S GUIDE

[. . . ] Both pilots can still listen to COM 3, NAV 1, NAV 2, DME, ADF and MKR as selected. The Split COM mode is , cancelled by pressing the COM 1/2 button a second time. When in the Split COM mode the copilot may make PA announcements while the pilot continues using COM 1 independently. When the PA button is pressed after the Split COM mode is activated, the copilot's mic is output over the cabin speaker when keyed. [. . . ] Two 3. 5 mm stereo phone jacks should be installed in a convenient location for this purpose. MUSIC 1 and MUSIC 2 have characteristics that are affected by the active intercom mode. Refer to the table on page 7. . Audio level is controlled by the selected NAV radio volume control. 5 Intercom System (ICS) (Pilot and Copilot functions are reversed on the 340H) Intercom volume and squelch (VOX) are adjusted using the following front panel knobs: · LEFT SMALL KNOB -- Unit ON/OFF power control and Pilot ICS volume. CW rotation increases the amount of mic audio (VOX level) required to break squelch. OUT position: Passenger ICS volume. · RIGHT LARGE KNOB -- Copilot and passenger mic VOX squelch level. CW rotation increases the amount of mic audio (VOX level) required to break squelch. Fully CCW is the "HOT MIC" position. Each of the six microphone inputs have dedicated VOX circuits ensuring that only the active microphone(s) is/are heard when squelch is broken. This represents a vast improvement over the partyline systems and reduces the amount of background noise in the headphones during cockpit communications. After the operator has stopped talking, the intercom channel remains momentarily open to avoid closure between words or normal pauses. The mode selection is accomplished using the PILOT and/or CREW buttons. The operator can switch directly from PILOT to CREW or from CREW to PILOT by pressing the other mode button. To switch from PILOT to CREW mode, press the CREW button; from CREW to PILOT, press the PILOT button. An LED ON indicates the isolation mode is active. 6 · PILOT mode isolates the pilot from everyone else and dedicates the aircraft radios to the pilot exclusively. The copilot and passengers share communication between themselves but cannot communicate with the pilot or hear the aircraft 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 aircraft radios. · ALL mode allows full intercom communication between everyone plugged in to the GMA 340. · MUSIC 1 and MUSIC 2 stereo entertainment inputs are affected by the intercom mode selected. The following table summarizes the ICS operation for the different modes supported by the GMA 340: MODE PILOT HEARS Selected Radios. ICS activity. PILOT (LED LIT) CREW (LED LIT) ALL LED's OFF) MUSIC 1 is normally muted during ICS activity. The MUSIC 1 mute trip level is adjustable by the installing agency. Mono/Stereo Headset The use of stereo headsets is highly recommended. A person listening on a monaural headset will hear only the left channel from the GMA 340 in both ears. If a monaural headset is used at one of the passenger positions, any other passenger listening on a stereo headset will hear audio in their left ear only, unless their headset has a stereo/mono switch and it is set for mono. . If monaural headsets are plugged into stereo jacks that do not have a switch installed, the unit will not be damaged. [. . . ] The button's LED will remain lit to indicate that the source is still selected. The GMA 340's function then monitors the marker signal and automatically unmutes the audio when the current marker signal is no longer being received. In all cases, the marker beacon lamps operate independently of any audio selection and cannot be turned off. The GMA 340 can drive external marker lamps if required. 8 Limited Warranty GARMIN Corporation warrants this product to be free from defects in materials and workmanship for one year from the date of purchase. [. . . ]