Northern Airborne Technology N301A - Manual (Page 5)

N301A-000 Audio Controller
SM45 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-2
ENG-FORM: 800-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Input current 0.5 Amps Max.
Lighting 200 mA @ 27.5 Vdc
Input Signals
Quantity 12 receive channels
2 mic channels
4 direct channels
Audio level 4.5 Vrms for receiver inputs
0.25 Vrms for 150
Ω mic input
0.25 mVrms for 5
Ω mic input
4.5 Vrms for direct audio inputs
Impedance 10 k
Ω ±10% for receive inputs
150
Ω ±10% for 150 Ω mic input
5
Ω ±2 Ω for 5 Ω mic input
10 k
Ω ±10% for direct audio inputs
Circuitry Type All are balanced inputs except for the 150
Ω mic (single ended)
Coupling < -60 dB input-to-input Crosstalk
Keylines Transmit PTT – active low
ICS PTT – active low
Output Signals:
Quantity 2 headset outputs
6 transmitter mic outputs
6 transmitter keyline outputs
1 mode of CVR output (Models -103 & -105 have 2 modes)
Rated level Hi impedance headset output >12.3 Vrms or 250 mW into 600
Ω
Low impedance headset output >1.42 V ms or 250 mW into 8
Ω
RX input CVR level - 1.4 Vrms
±10% into 5k Ω
Mic input CVR level - 0.45 Vrms
±50mV into 5k Ω
Mic output – 250 mVrms nominal into 150
Ω
Keyline outputs
≤1 A max. sink for mic keys
Circuitry Type Headsets and CVR are balanced outputs
Microphone outputs are single ended
Frequency Response Receive inputs <3 dB from 350 Hz to 6000 Hz
Direct inputs <3 dB from 350 Hz to 6000 Hz
Intercom <3 dB from 350 Hz to 3000 Hz
CVR output <3 dB from 350 Hz to 6000 Hz
Distortion <10% THD @ rated power output
Audio Noise Level Without Signal: >50 dB down from rated output
Coupling: <-55 dB input-to-output Crosstalk
Output Regulation <10% distortion /
Δ3 dB max. of rated output power at 400% and 75% of
rated load