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SM69 Rev. 4.00 AA12S Series Compact Audio Controller Manual
3.3.1.3 VOX/TX Annunciator
The VOX/TX Annunciator is a bicolour LED that indicates the intercom status.
During VOX activity, the annunciator LED is illuminated red. If TX is keyed with no ICS
or sidetone, the annunciator LED is illuminated green. If TX is keyed with mic or
sidetone, the combination of red and green will cause the LED to appear amber.
Note: If the LED is still illuminated green after transmission is concluded, this indicates
a possible stuck mic.
3.3.2 Intercom
ICS VOL/VOX S
q
uelch Control
V
O
X
/
TX Ann
u
n
c
i
at
o
r
The VOX and ICS VOL control is a fluted concentric knob, with the ICS volume on the
centre knob, and the VOX control on the outer knob.
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.
Oct 13, 2005 Page 3-3
ENG-FORM: 806-0106.DOT Amendment #1 Oct 14, 2005
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.