Northern Airborne Technology 3110 - Manual (Page 14)

3110-100 Audio Control Panel Manual SM3110 Rev. 4.00
• Dynamic VOX system for noise reduction. This system removes unwanted
background noise that might be picked up by the pilot’s microphone, and prevents it
from entering the interphone channel.
• Protection circuits to help prevent accidental damage from overvoltage and reverse
voltage conditions.
• Five direct audio Aural Warning inputs with priority for inputs 1 and 2.
• Automatic fail-safe operation in the event of a power failure.
• A Voice/Ident filter for the NAV and ADF inputs.
• A MKR mute function to temporarily mute the marker beacon audio.
• A CVR audio output, which includes pilot Hot Mic audio.
• An OXY mode to minimise pilot workload when switching to use of an oxygen mask.
• Noise gating to minimise unwanted audio noise at the pilot headset and cockpit
speaker outputs.
1.4 Specifications
1.4.1 Electrical Specifications
1.4.1.1 Power Input
Operating Voltages:
Maximum +30.3 Vdc
Nominal +28.0 Vdc
Minimum +22.0 Vdc
Emergency +18.0 Vdc
Annunciator Lighting 0 - 28 Vdc
Backlighting 0 - 5 Vdc
1.4.1.2 Input Signals
Microphone: (BOOM/MASK MIC, HAND MIC, SVC MIC)
Specification TSO-C58a (RTCA/DO-170)
Type Differential, AC coupled, transformerless
Impedance 150 Ω
Page 1-2 Aug 25, 2005
ENG-FORM: 800-0108.DOT
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