GMA™ 342

Physical & Performance

• Electrical:14-28 VDC
• Unit size: 6.3"W x 1.33"H x 8.09"D (160 x 34 x 205 mm), includes mounting rack and connectors
• Weight: 1.78 lbs. (807.4g), includes rack, backplate and connectors

Environmental

• Temperature: -20° C to +55° C (operating)
• Altitude range: to +55,000 ft. MSL unpressurized
• Power requirements: 11 to 33 VDC input

Radio Inputs

• Impedance: 600 ohm
• Max Input: 5 Vrms
• Isolation: 60 dB minimum
• Bandwidth: 100 Hz to 6.5 kHz
• Transceiver: 3 (including TEL)
• Receiver: 5 (NAV1, NAV2, AUX1, AUX2, AUX3)
• Alerts: 4 (unswitched)
• Telephone input: 1

Intercom Functions

• Positions: 6 (pilot, copilot, 4 passengers)
• Volume control: 2 (pilot, copilot/passengers)
• VOX: Automatic (1 per MIC input)
• Modes: Pilot, crew, all
• MIC impedance: 150 ohm
• MIC bias: 11 VDC through 470 ohm
• Keyed ICS: Configurable

Music Functions

• Inputs: 2 (independent from front 3.5 mm jack)
• Impedance: Connector pins 600 ohm (differential); front jack 5kOhm
• Max input: Rear connector 3.0 Vrms; front jack 1.5 Vrms
• Gain: Rear connector +24 dB Max; front jack +21 dB Max/-96dB Min
• Input level: < 200 mVrms at max gain for full power out
• Bandwidth: 20 Hz to 20 kHz
• Distortion: < 0.1% THD+N typical at full power over full bandwidth
• Muting: Selectable and configurable
• Volume control: Knob controlled (Pilot and Copilot/Pass)

Headphone Outputs

• Output amplifiers  3 Stereo (pilot, copilot, passenger)
• Output power: 65 mW into 150 Ohms pilot and copilot, 260 mW into 37.5 Ohms passenger
• Distortion: < 3% THD+N at 10% power, < 10% THD+N at full power
• Frequency response: 20 Hz to 20 kHz
• Impedance rated: 150 Ohm pilot/copilot, 37.5 Ohm passenger (4-150 Ohm headsets)
• Impedance supported: 150 to > 600 Ohm

COM/TEL Microphone Outputs

• Output power: 15 mW into 150 Ohms (1.5 Vrms)
• Distortion: < 3% THD+N at 10% Power, < 10% THD+N at full power
• Frequency response: 300 Hz to 6 kHz

Front Jack Microphone Output

• Output power: 170 uW into 450 Ohms (276 mVrms) connected as phone
• Frequency response: 300 Hz to 6 kHz

Speaker

• Outputs: 1
• 28 Volt Aircraft: 10 Watt into 4 Ohm; 7 Watt into 8 Ohm
• 14 Volt Aircraft: 3 Watt into 4 Ohm; 3dB@1kHz Bandwidth 350 Hz to 6.5 kHz
• 3dB@1kHz Bandwidth 350 Hz to 6.5 kHz
• Distortion: < 10% THD+N @ Full Power, < 3% THD+N @ 10% Power

Voice Recorder    

• Record time max: 1 minute       

Code Load Options

• SD Card

DIP Switch

• Config switches: 8 (see install manual for descriptions)

Lighting Bus

• Voltage: 14 V or 28 V