Northern Airborne Technology AA39 - Manual (Page 4)

AA39 Series Headset Adapter
SM43 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0113.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the AA39
Series of Dynamic Headset Adapters.
The descriptions given are for the AA39-187, and are identical to those for other models unless otherwise
noted. All derivative product information shall be contained in the applicable manual supplement, which
may be obtained from NAT as required.
Review all notes, warnings and cautions.
1.2 Product Description
The AA39-187 is a single military headset adapter, consisting of a 5
Ω dynamic military mic to general
aviation 150
Ω amplified dynamic mic adaptor, with an 8 Ω to 600 Ω transformer for phones matching.
The AA39-287 operation is identical to the AA38-187, but is designed for two headsets.
The AA39-087 is used to adapt 5
Ω dynamic military mics (i.e. M-87) to general aviation 150 Ω audio systems.
The AA39-075 is used to adapt 75 Ω dynamic military mics (i.e. ELNO) to general aviation 150 Ω audio systems.
1.3 Design Features
The AA39-075, AA39-087, AA39-187 and AA39-287 are small, remote mounted metal units with D-sub
connectors. The units are designed to operate from standard mic bias, supplied by the aircraft radio and
intercom system.
1.4 Specifications
1.4.1
Electrical Specifications
1.4.1.1 AA39-075 and AA39-087
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: 1 Mic channel,
Audio level: AA39-075 850
μVrms for mic input
AA39-087 250
μVrms for mic input