AA12S Series Compact Audio Controller
SM69 Installation and Operation Manual
Section 3 Rev: 1.00
Issue 4
Page 3-3
3.3.2.1
VOX Control
The VOX control is used to set the level of audio required to activate the microphones.
The AA12S provides three modes of intercom operation, selected by the position of the VOX control.
LIVE ICS
When the VOX control is positioned fully counter-clockwise (ccw), all mics will be live,
and any sound picked up by the microphone(s) will be processed by the ICS system
KEYED ICS
When the VOX control is positioned fully clockwise (cw), the intercom will be in a keyed-
only mode.
VOX ICS
When the VOX control is positioned between fully cw and fully ccw, the intercom is in
VOX mode. To establish the VOX threshold, rotate the control ccw until the LED turns
red, and then rotate the control cw until the LED goes dark. Continue turning the control
cw until the desired voice sensitivity is set.
3.3.2.2
ICS Volume Control
The ICS VOL control, which has a line to mark rotational position, is at minimum volume when fully ccw.
As the knob is rotated cw, the ICS volume for crew and PAX increases.
The ICS is muted during transmit operations.
3.3.3
PILOT ISO / NORM Modes
Pilot Isolate Switch
The PILOT ISO/NORM control is a red, two-position toggle switch that allows selection of either NORM
(Normal) or PILOT ISO (Pilot Isolate).
In NORM mode (default) everyone on the system can talk to each other, listen to music, and hear all
selected radio audio.
The PILOT ISO mode separates the pilot from the intercom network, allowing confidential radio
communications without interference from the copilot or passenger intercom or music, while maintaining
complete control of all the radio functions of the audio panel. The copilot and passengers retain normal
intercom and music functions.
Note:
In PILOT ISO mode, the receive/sidetone levels may require adjustment at the audio source.
ENG-FORM: 806-0112.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
