Garmin GMA 340 - Manual (Page 6)

6
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. Full
CCW DETENT position is OFF.
• LEFT LARGE KNOB — Pilot ICS mic VOX squelch level. CW rotation increases the
amount of mic audio (VOX level) required to break squelch. Full CCW is the “hot mic”
position.
•
RIGHT SMALL KNOB — IN position: Copilot ICS volume. 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 party-
line systems and reduces the amount of background noise in the headphones during cockpit communica-
tions. After the operator has stopped talking, the intercom channel remains momentarily open to avoid
closure between words or normal pauses.
The GMA 340 provides three intercom modes: PILOT, CREW and ALL. The mode selection is
accomplished using the PILOT and/or CREW buttons.
Pressing a mode button activates the corresponding ICS mode. Pressing again deactivates the mode.
The operator can switch directly from PILOT to CREW or from CREW to PILOT by pressing the other
mode button. The ALL mode is active when neither PILOT nor CREW LED are lit. 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.