Northern Airborne Technology AA38-3xx - Manual (Page 5)

AA38-3xx Series Local ICS Loop
SM37 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 Signals
Quantity
8 Mic channels
(AA38-300) 1 ICS tie channel
1 Aux input channel
Quantity 16
Mic channels
(AA38-301) 2 ICS tie channels
2 Aux input channels
Audio Level
250 mVrms for mic inputs
0.34 Vrms for NAT ICS tie input
2.8 Vrms for Andrea ICS tie input
2.5 Vrms for Aux input
Impedance 150
Ω ±10% for mic inputs
1.6k
Ω ±10% for NAT ICS tie input
250
Ω ±10% for Andrea tie input
940
Ω ±10% for Aux input
Circuitry Type
All mics are single-ended inputs
Tie lines are single-ended inputs
Aux line is single-ended input
Better than -60 dB input-to-input crosstalk (Mic to Aux to ICS)
Output Signals
Quantity
8 Headset outputs
(AA38-300)
Quantity
16 Headset outputs
(AA38-301)
Rated Level
Headset output 7.7V rms or 100 mW (20 dBm) into 600
Ω
Impedance 30
Ω ±10%. (Headset output)
Circuitry Type
Balanced output for high common mode noise rejection
Audio Frequency Response
Intercom
<3 dB from 350 Hz to 3000 Hz
RX
<3 dB from 350 Hz to 6000 Hz
Distortion
<10% THD @ Rated power output
Audio Noise Level
>60 dB down from rated output (without signal)
Output Regulation
<10% distortion /
Δ3 dB max. of rated output power at 400% and
75% of rated load