Northern Airborne Technology AA39 - Manual (Page 5)

AA39 Series Headset Adapter
SM43 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-2
ENG-FORM: 800-0113.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Impedance: AA39-075 75
Ω ± 1 Ω for mic input
AA39-087 5
Ω ± 1 Ω for mic input
Circuitry Type: Balanced
Output Signals
Quantity: 1 mic output
Rated level: 250 mVrms into 150
Ω for mic output
Gain: Min. 1000 or 60 dB for mic amplifier (adjustable)
Circuitry Type: Single ended
1.4.1.2 AA39-187 and AA39-287
Input Power Not Applicable
Input Signals
Mic Bias: Nominal Bias Voltage: +12 Vdc
Maximum Bias Voltage: +16 Vdc
Minimum Bias Voltage: +9 Vdc
Other: Input current: 10 mA Max. @ Min Bias Voltage
Quantity: AA39-187 1 Mic input, 1 phones input
AA39-287 2 Mic inputs, 2 phones inputs
Audio level: 250
μVrms for mic input
7.7 Vrms for phones input
Impedance: 5
Ω ± 1 Ω for mic input
300
Ω ± 10% for phones input
(dependent on load impedance)
Circuitry Type: Balanced input for mic
Balanced transformer input for phones
Output Signals
Quantity: AA39-187 1 mic output, 1 phones output
AA39-287 2 mic outputs, 2 phones outputs
Rated level: 250 mVrms into 150
Ω for mic output
0.8 Vrms into 8
Ω for phones output
Gain: Min. 1000 or 60 dB for mic amplifier
Min. 8.5:1 ratio for phones transformer
Circuitry Type: Single ended output for mic
Balanced transformer output for phones
Freq. Resp. <3 dB from 350 Hz to 6000 Hz. for mic channel
<3 dB from 350 Hz to 6000 Hz. for phones channel
Distortion: <10% THD @ Rated power output
<3% THD @ 10% Continuous output
Audio Noise Level: Without Signal: <-50 dB from rated output
Coupling (AA39-287): Input to Input:
≤-40 dB from rated output