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GMA 240 Installation Manual Page 1-3
190-00917-01 Rev. A
1.3.2 Electrical Characteristics
Characteristic Specification
Temperature Range
-20°C to +55°C (operation)
-55°C to +85°C (storage)
Altitude 55,000 Feet
Audio Panel
Functions
Dedicated Transceiver inputs: 3 (including TEL)
Dedicated Receiver inputs: 4 (all independently selectable)
Alert (unswitched) inputs: 3 (each with configurable volume)
Input impedance: 500
Ω
Input isolation: 60 dB minimum
Alert/Receiver/Transceiver bandwidth: 100 Hz to 6.5 kHz
Special functions: Fail-safe operation
MASQ™ processing (Master Avionics Squelch)
Configurable button push aural annunciation
Intercom Functions Positions: 4 (pilot, copilot, 2 passengers)
Volume controls: 3 (pilot, copilot/passengers, music)
VOX level controls: 2 (pilot, copilot/passengers)
VOX circuits: 4 (one per mic input)
Microphone input impedance: 450
Ω (compatible with 150 to 600 Ω
mics)
Microphone bias voltage: about 10 Vdc delivered through 450 Ω
Microphone response: 9-pole characteristic cabin noise de-emphasis
Intercom isolation modes: 2 – all, pilot (or configure for all, crew)
Telephone interfaces: 1 full-duplex (use LRU pins or front jack)
Headphone Outputs Output amplifiers: 2 stereo (pilot, copilot/passengers)
Fidelity: Load Power Distortion (typ.)
150
Ω 50 mW <0.03% THD+N
150
Ω 100 mW <0.07% THD+N
50
Ω 150 mW <0.07% THD+N
50
Ω 300 mW <0.10% THD+N
Compatible with higher headphone impedances, those shown are for worst-case
distortion and bandwidth