Garmin GMA340 Audio Panel

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GARMIN's new GMA 340 audio panel meets the needs of aircraft owners and operators who require reliability and versatility in the essential audio switching function. The GMA 340 features innovative LED-illuminated push button controls that allow audio selection of both NAV and Comm audio. Large buttons activate the Comm microphone and audios for up to three Comm transceivers to simplify cockpit workload.

Another feature of the GMA 340 is the Split Comm, which allows the pilot to transmit/receive on Comm 1 and the co-pilot to transmit/receive on Comm 2. Comm transmit indication is also provided.

Speaker selection is available to monitor the aircraft radios or to make PA announcements. There are two unswitched inputs for telephone ringers, altitude alert warnings, or other warning tones. In addition, the GMA 340 includes a six-place VOX intercom with three selectable modes of isolation, dual stereo music inputs, and independent pilot, co-pilot, and passenger volume control. Each microphone input has a dedicated VOX circuit to ensure that only the active microphone is heard when squelch is broken.

Also standard is the three-light Marker Beacon Receiver/Indicator with high/low sensitivity selection and audio muting with automatic rearming. Surface mount technology provides shallow depth and light weight, which simplifies installation in the tightest aircraft spaces and saves precious panel space. Operation is available in 14 or 28 volts without voltage converters or dropping resistors. Installation is simplified with the built-in intercom and marker beacon, and the GMA 340 also features photo cell dimming of annunciators, pilot fail-safe mode connection to Comm 1, and FAA TSO approval.

General Specifications
TSO Compliance:	TSO-C50c, TSO-C35d Weight: 1 lb., 10oz. (installed)
Physical Dimensions:	Length 6.4in , Width: 6.29in , Height: 1.3in
Power Requirements:	Supply voltage: 11-33 Vdc o Operating current: 2.2A (13.8V, speaker on)
Temperature Range:	-20C to +55C (normal operation)
Altitude:	50,000 MSL unpressurized
Marker Beacon Reciever
Frequency:	Crystal controlled at 75 Mhz
Sensitivity:	LO 1000 uV hard o HI 200 uV hard
Selectivity:	6 dB @ +/- 10kHz min. 40 dB @ +/- 200 kHz max
Input Impedance:	50 ohms External lamp drive: 125 mA max each output
Other Outputs:	Middle MKR sense
Special Functions:	Audio muting with auto re-arm feature
Audio Panel
Transceiver Inputs:	3 Receiver inputs: 5 Unswitched inputs: 2 Input impedance: 500 ohms Input isolation: 60 dB min
Special Functions:	Fail-safe operation
Intercom
Positions:	6 (pilot, copilot, and 4 passengers)
Volume Controls:	3 (pilot, copilot, and passengers)
VOX Level Controls:	2 (pilot, copilot/passengers)
VOX Circuits:	6 (one per mic input)
Music Inputs:	2 (one input mutable)
Intercom Isolation Modes:	3 (pilot, crew, all) Intercom functionality in split com mode
Full Microphone Signal Processing:	9 pole characteristic and special cabin noise band de-emphasis
Special Functions:	Configurable aural push-button annunciation for the crew
Speaker Outputs
Outputs Selectable:	1, pilot selectable
Frequency Response:	350 to 6 kHz nom
Special Functions:	PA Mode, pilot selectable, including split operation
Headphone Outputs
Output Amplifiers:	3, stereo (pilot, copilot, passengers) Fidelity (Power and Distortion) Power (per stereo Distortion channel)