19711 CAMPUS DRIVE  SANTA ANA, CA 92707
PHONE: 949-757-0290 FAX: 949-757-0293
FAA CERTIFIED REPAIR STATION YH3R997L
                   

 

 

Garmin GMA 340 Audio Panel
GMA 340
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Garmin's GMA340 audio panel meets the needs of aircraft owners and operators who require reliability and versatility in the essential audio switching function.

The GMA340 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 GMA340 is the Split Comm, which allows the pilot to transmit/receive on Comm 1 and the co-pilot to transmit/receive on Comm 2. MASQ™ processing reduces ambient noise from the avionics inputs. 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 GMA340 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. Special cabin noise de-emphasis circuitry enhances cockpit communications. Also standard is the three-light Marker Beacon Receiver/Indicator with high/low sensitivity selection and SmartMute™ marker audio muting.

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 GMA340 also features photo cell dimming of annunciators, pilot fail-safe mode connection to Comm 1, and FAA TSO approval.

Read what Private Pilot magazine had to say about the GMA340:

"The Garmin® Model 340 audio panel, reviewed above, is the finest example of communications integration and control for GA. The ICS system offers everything: individual level controls, positive com override of crew/music audio, stereo or monaural operations, soft-on/off, music/voice, crew-isolation, positive VOX control—you name it! The marker beacon and multifunction communications controls complete an excellent design. This unit will be as popular as Garmin's GPS units." -Private Pilot, March 1999

Specifications

General

TSO compliance:

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

Physical Dimensions:

  • Length = 6.4"
  • Width = 6.29"
  • Height = 1.3"

Power Requirements:

  • Supply voltage: 11-33 VDC
  • Operating current : 2.2A (13.8V, spkr on)

Enviromental

  • Temperature range: -20°C to +55°C (normal operation)
  • Altitude: 50,000 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: 5
  • Unswitched inputs: 2
  • 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: 3 (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: 100 Hz to 15 kHz nom
  • A/C radio: 100 Hz to 6 kHz nom
  • ICS mic: (Special cabin noise band de-emphasis)

Specifications are subject to change without notice.