Garmin GMA 347 Installation Manual page 14

1.3.2 Electrical Characteristics
Specification
Regulatory Compliance
Unit Software
Temperature Range
Altitude
Audio Panel
Intercom
Headphone Outputs
Speaker Outputs
Marker Beacon Receiver
Page 1-4
Revision A
RTCA/DO-160D Environmental Conditions and EUROCAE/ED-14D
RTCA/DO-178B Level D
-45°C to +70°C
55,000 Feet
Transceiver inputs: 3
Receiver inputs: 5
Unswitched inputs: 4
Input impedance: 500
Input isolation: 60 dB minimum
Special functions: Failsafe operation, MASQ
processing
Maximum Input: COM, NAV, DME, AUX, Failsafe, Unswitched inputs 1-3,
Altitude Warning; 4 V rms
TEL; 3.5 V rms
Positions: 6 (pilot, copilot, 4
Volume controls: 2 (pilot, copilot/passengers)
VOX level controls: 2 (pilot, copilot/passengers)
VOX circuits: 6 (one per mic input)
Music inputs (stereo): 2 (one input mutable)
Music input impedance: 5 k
Music input level: Less than 500 mVac RMS for full output (typical).
1 Vac RMS MAX (3 Vac p-p)
Microphone signal processing: 9 pole characteristic and special cabin
noise band de-emphasis
Intercom isolation modes: 4 (All, Pilot Isolate, Copilot Isolate, Crew
Isolate)
Special functions: Recorder with playback (automatic recording of
selected COMs) up to 2.5 minutes of recording time.
Automatic squelch: 6 (one per mic input) pilot selectable between auto
and manual.
Output amplifiers: 3, stereo (pilot, copilot, passengers)
Fidelity: Power into 150
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
Frequency response: 350 Hz to 6 kHz nominal
Special functions: PA Mode, pilot selectable, including split operation
Frequency: Crystal controlled at 75 MHz
Sensitivity: LO 1000 µV hard; HI 200 µV hard
Selectivity: 6 dB @ ±10 kHz min, 40 dB @ ±200 kHz max.
Input impedance: 50
External lamp drive: 125 mA max each output
Other outputs: Middle MKR sense
Special functions: SmartMute
Characteristic
passengers)
Distortion
<0.5%
<5%
or 8 , @ any normal supply voltage.
TM
marker audio muting
GMA 347 Installation Manual
TM
190-00325-01