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Garmin GMA 347 Audio Panel
GMA 347
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The GMA347 audio panel builds upon the successful attributes of the GMA 340 while adding benefits such as automatic squelch, digital clearance recorder, and a full-duplex telephone interface.

The GMA347's automatic squelch option makes the entire audio experience quieter and clearer. Since there are some occasions when pilots wouldn't’t want an automatic squelch—such as high-noise environments—the GMA347 also retains the manual squelch adjustment feature. Garmin has also added three more un-muted, un-switched inputs with individual volume control.

The GMA347’s automatic digital clearance recorder helps pilots manage the demands of a busy cockpit. The unit continuously captures the last two and one half minutes of audio switched through the panel. If a pilot misses a frequency change or clearance, he or she can replay the necessary information by simply pressing the “play” button.

In addition, the GMA347 has a full-duplex telephone interface with intercom isolation and disable capability. This feature allows private telephone calls by the pilot or copilot, or multi-party calls with crew and/or passengers.

Pilots will also appreciate the integration of the G1000’s “configuration module” into the GMA347. If the audio panel is ever removed, all of the pilot’s preferred settings are automatically loaded into the unit.
Specifications

General

TSO compliance:

  • TSO-C50c
  • TSO-C35d using DO-160C, DO-170, DO-143, and DO-1788

Physical Dimensions:

  • Length = 7.79"(depth behind panel, with connectors)
  • Width = 6.29"
  • Height = 1.3"
  • Weight: 1.71 lbs.

Power Requirements:

  • Supply voltage: 11-33 VDC
  • Operating current : 3.75A (13.8V, spkr on)

Enviromental

  • Temperature range: -45°C to +70°C (normal operation)
  • Altitude: 55,000 MSL unpressurized

Marker Beacon Receiver

  • Frequency: Crystal controlled at 75 Mhz
  • Sensitivity: LO 1000 uV hard, 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

Audio Panel

  • Transceiver inputs: 3
  • Receiver inputs: 6
  • Unswitched inputs: 4
  • Input impedance: 500 ohms
  • Input isolation: 60 dB min

Intercom

  • Positions: 6 (pilot, copilot, 4 passengers)
  • Volume controls: 3 (pilot, copilot, passengers)
  • VOX level controls: 2 (pilot, copilot/passengers)
  • VOX circuits: 6 (one per mic input)
  • Music inputs (stereo): 2 (one input mutable)
  • Intercom isolation modes: 4 (pilot, crew, all)

Speaker Outputs

  • Outputs selectable: One, pilot selectable
  • Output power: 10 Watts into 4 or 8 ohms, any normal supply voltage.
  • Frequency response: 350 to 6 kHz nom
  • Special functions: PA Mode, pilot selectable

Headphone Outputs

  • Output amplifiers: 3, stereo (pilot, copilot, passengers)
  • Power: 100 mW per stereo channel, each headset, into 150 ohms with not more than 5% distortion, any normal supply voltage.

Frequency response:

  • Music: 50 Hz to 20 kHz nom
  • A/C radio: 200 Hz to 6 kHz nom
  • ICS mic: (Special cabin noise band de-emphasis)

Specifications are subject to change without notice.