Operation, 1 introduction, 2 general – Northern Airborne Technology AA24 User Manual
Page 43: 3 controls and indicators, 1 transmit selection
SM18 Rev 4.00
AA24/AA25 Series Single User Audio Controller Manual
Section 3.0 Operation
3.1
Introduction
Information in this section consists of the functional and operational procedures for the
AA24/AA25 Series Single User Audio Controller.
3.2 General
The AA24/AA25 series single user audio controllers allow selection of transmit and
receive audio, and LIVE, VOX or PTT intercom. One direct alerting input is provided to
allow emergency alerting audio to pass unmuted to the user's headset. After
transmitting on the radios the user's microphone automatically reverts back to intercom
mode. The AA25 audio controller also provides central volume adjustment for all the
aircraft audio.
3.3
Controls and Indicators
Transmit
Selection
Control
RX Volume
Controls
RX/TX Select Switches
VOX Control
TX Annunciator LED
RX and ICS
Volume Control
3.3.1 Transmit
selection
The rotary selector switch at the lower left of the panel selects the desired transmit
function. When the radio PTT switch is activated, the microphone will be coupled to the
radio or PA channel selected. Receive audio is automatically selected with the transmit
selection, and no additional switching is needed to establish outside communication.
During transmission, the TX annunciator LED on the front panel will illuminate green.
Nov 21, 2003
Page 3-1
ENG-FORM: 806-0105.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.