Northern Airborne Technology AA12 - Manual (Page 39)

SM21 Rev. 4.10 AA12 Compact Audio Controller Manual
Sep 9, 2004 Page 3-3
ENG-FORM: 806-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.4 Intercom
ICS Volume Control VOX Squelch Control
The AA12 provides three modes of intercom operation, as selected by the position of
the VOX Squelch control:
LIVE VOX Squelch positioned fully counter-clockwise (ccw)
VOX VOX Squelch positioned in the active range
MAX (keyed) VOX Squelch positioned fully clockwise (cw)
When the VOX Squelch control is adjusted to the fully ccw direction, the AA12 is in LIVE
ICS mode. The front panel annunciator illuminates orange and any sound picked up by
the MIC(s) is transferred over the ICS system.
When the VOX Squelch control is adjusted to the fully cw direction, the AA12 is in MAX
(keyed) ICS mode. The front panel annunciator remains dark and no sound is picked
up by the MIC(s) unless keyed. The MAX (keyed) ICS mode should be used in
environments where it is impractical or impossible to use LIVE or VOX modes.
When the VOX Squelch control is adjusted to any position other than fully ccw or fully
cw the AA12 is in VOX ICS mode. The annunciator can be used as a guide to properly
set the VOX Squelch. To set the VOX Squelch, from the ccw position of the VOX
Squelch control, slowly advance the control in a cw direction until the annunciator
turns off.
The front panel ICS VOLUME control controls the headset volume for all ICS modes.
Note: ICS is muted during transmit operations.
3.5
Entertainment Audio
The AA12 has a rear MUSIC input that allows signals from a Walkman or Discman type
device to be introduced into the aircraft audio system. This input is muted during
transmit functions, when the intercom is active, and during reception of radio audio.