Garmin GMA 240 Installation Manual - Page 9

Characteristic, Specification - audio panel installation manual

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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

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GMA 240 Installation Manual
Page 1-3
190-00917-01
Rev. B
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