Northern Airborne Technology 3110 - Manual (Page 15)

SM3110 Rev. 4.00 3110-100 Audio Control Panel Manual
Input Level, Rated 250 mVrms
Dynamic Range 20 mVrms - 1.5 Vrms (MIC input to COM output only)
DC Bias: 22 ±5 mA at 15 Vdc
Keyline: (RADIO PTT, CKPT INPH PTT, HAND MIC
PTT, SVC PTT)
Level: Open ( ≥100 kΩ) (Inactive)
GND (<30 Ω) (Active)
Source Current: <20 mA
Discrete Input: (AUX MUTE INHIBIT, AUX LEVEL, AUX MUTE
SWITCH, CABIN CALL SW, EMER MODE IN,
OXY SWITCH, ANNUNC TEST)
Level: 18.5 to 36 V (HI)
<3.5 V (LO)
Impedance: ≥100 kΩ, AUX MUTE INHIBIT ≥ 50 kΩ
Source Current: <20 mA
Analog Receiver/Sidetone: (RCVR, SDTN)
Type: Differential, AC coupled, transformerless
Input Level: See Table 1
Impedance: 2 k Ω single ended (LO grounded), or
4 k Ω differential
Analog Aural Warning: (AUX)
Type: Differential, AC coupled, transformerless
Input Level: See Table 2
Impedance: 10 k Ω single ended (LO grounded) or
20 k Ω differential
Priority Detection Threshold: 90 ± 20 mVrms
EMER Receiver: (VHF BKUP RX)
Type: Single ended, transformerless, passive resistor
bypass
Input level: 7.75 Vrms nominal
EMER Aural Warning: (AUX BKUP)
Type: Single ended, transformerless, passive resistor
bypass
Input level: See Table 2 in section 1.4.1.3
Aug 25, 2005 Page 1-3
ENG-FORM: 800-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.