Northern Airborne Technology AA24 - Manual (Page 9)

SM18 Rev. 4.00 AA24/AA25 Series Single User Audio Controller Manual
Section 1.0 Description
1.1 Introduction
This manual contains information on the AA24/AA25 Series Single User Audio Controller.
All derivatives will be covered by manual supplements which can be obtained from NAT
as required.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA24/AA25 series single-user Audio Controllers support one headset per box.
Connection to other users in the system is made through the ICS Tie line. The small
size and extensive radio and ICS functions make this unit an excellent choice for multi-
station aircraft.
The AA24/AA25 series systems provide full boom-mic transmit and ICS functions for the
user. The front panel controls permit user adjustment of frequently needed signals, such
as intercom audio level, VOX threshold, and individual radio receive levels. Internal
adjustments set default values for direct audio level and artificial side tone.
1.3 Features
The AA24/AA25 series systems employ NAT's unique audio processing which reduces
noise and tailors the frequency response to produce clean, crisp intercom audio.
Having high output power and low distortion results in better on-board communication.
Inputs are fully floating and include a dedicated alerting input. The tie line of the
AA24/AA25 series is fully compatible with other NAT systems including AA80, AA82,
AMS40 and AA95 series units. By keeping ‘ICS TIE LINE’ characteristics fully
compatible with existing NAT products, it is possible to chain multiple systems together
to a maximum of 4 units. The AA24/AA25 series have over-voltage and reverse-voltage
protection, to ensure operability in severe aircraft environments. A front panel
annunciator allows easy visual setting of the ‘VOX’ threshold, and also indicates
transmit operation. In addition to all common features the AA25 also provides
independent radio volume adjustment of up to 6 sources.
Nov 21, 2003 Page 1-1
ENG-FORM: 800-0106.DOT
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