Northern Airborne Technology 3110 - Manual (Page 19)

SM3110 Rev. 4.00 3110-100 Audio Control Panel Manual
1.4.1.4 Bidirectional
Signals
Service Interphone: (SVC INPH I/O)
Type Differential, AC coupled, transformerless, short
circuit protected
Impedance 300 Ω
Dynamic Range 20 mVrms to 1.1Vrms, (1.55 V peak) into 300 Ω
Rated power 4.0 mW into 300 Ω (1.1 ±0.2 Vrms)
Flight Station (Cockpit) Interphone: (CKPT INPH I/O)
Type Differential, AC coupled, transformerless, short
circuit protected
Impedance 300 Ω
Dynamic Range 20 mVrms to 1.1 Vrms, (1.55 V peak) into 300 Ω
Rated power 4.0 mW into 300 Ω (1.1 ±0.2 Vrms)
OXY I/O DISCRETE Internally connected to OXY SWITCH input
Sink current 100 mA Max.
1.4.1.5 Audio Performance: (TSO-C50c RTCA DO-214 class 1b)
Audio Frequency Response
All outputs except CVR: ≤3 dB variation from 300 Hz - 6000 Hz
CVR output with boom/mask mic input and VOX on:
≤3 dB variation from 300 Hz - 4500 Hz
Spurious Responses ≤-50 dB from rated output
Distortion ≤10% @ rated power
≤3% @ 10% rated power
Input Impedance Within ±45° of zero phase
Output Impedance ≤2.5 times manufacturer’s specification
Volume Controls 39 ±5 dB range.
Output Regulation ≤10% Distortion when output load is changed
from 75% to 400% of rated load impedance
Output Power ≤3 dB variation for Interphone and Isolation
Amplifiers
≤7 dB variation for amplifiers whose rated
output impedance is equal to that of the rated
load impedances
Input-Output Crosstalk and Bleed-Through Levels
≤-55 dB
Input-Input Crosstalk ≤-60 dB
Aug 25, 2005 Page 1-7
ENG-FORM: 800-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.