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1.3.2 Electrical Characteristics
Characteristic
Regulatory Compliance
Unit Software
CLD (Custom Logic
Devices) Compliance
Temperature Range
Power Requirements
Altitude
Audio Panel
Intercom
Headphone Outputs
Speaker Outputs
Marker Beacon Receiver
Page 1-4
Revision C
RTCA/DO-160D Environmental Conditions and EUROCAE/ED-14D
RTCA/DO-178B Level C
RTCA/DO-254 Level C
-45°C to +70°C
Supply Voltage: 28 VDC
See the Environmental Qualification Form for details on surge ratings and
minimum/maximum operating voltages.
Operating Current: 1.75 amps max at 27.5 V
55,000 Feet
Transceiver inputs: 3
Receiver inputs: 5
Unswitched inputs: 4
Input impedance: 500 Ω
Input isolation: 60 dB minimum
Special functions: Failsafe operation
MASQ
Positions: 5 (pilot and 4 passengers per GMA 1347D)
Volume controls: 2 (pilot, passengers)
VOX level controls: 2 (pilot, passengers)
VOX circuits: 5 (one per mic input)
Music inputs (stereo): 2
Music input impedance: 5 kΩ
Music input level: Less than 500 mVac RMS for full output (typical).
1 Vac RMS MAX (3 Vp-p)
Microphone signal processing: 9 pole characteristic and special cabin
noise band de-emphasis
Intercom isolation modes (-00): 2 (Pilot Isolate, Crew Isolate)
Intercom isolation modes (-20): 4 (Pilot Isolate, Crew Isolate,
Special functions: Recorder with playback (selectable recording of
selected COMs) up to 2.5 minutes of recording time.
Automatic squelch: 5 (one per mic input) pilot selectable between auto
and manual.
Output amplifiers: 2, stereo (pilot, passengers)
Fidelity: Power into 150 Ω
50 mW
100 mW
Frequency response: Music: 50 Hz to 20 kHz nominal
Aircraft radio: 200 Hz to 6 kHz nominal
ICS mic: (Special cabin noise band de-emphasis)
Outputs selectable: 1, pilot selectable
Output power: 10 watts into 4 Ω or 8 Ω, @ any normal supply voltage.
Frequency response: 350 Hz to 6 kHz nominal
Frequency: Crystal controlled at 75 MHz
Sensitivity: LO 1000 μV; HI 200 μV
Selectivity: 6 dB @ ±10 kHz min, 40 dB @ ±200 kHz max.
Input impedance: 50 Ω
External lamp drive: 125 mA max each output
Other outputs: Middle MKR sense
Special functions: SmartMute
Specification
TM
processing
Copilot Isolate, All ICS Mode)
Distortion
<0.5%
<5%
TM
marker audio muting
GMA 1347D Installation Manual
190-00303-21