Northern Airborne Technology AA83-001 rev.4.00 - Manual (Page 37)

SM09-2A Rev. 4.00 AA83-001 InterMUSIC™ Stereo Intercom System Manual
3.3.2
MUSIC VOL/COPILOT VOX
This control is a fluted concentric rubber knob on the right
side of the front panel.
The inner (front) knob is the MUSIC VOL control, which is
used to set normal music volume. The volume can be
adjusted from minimum (fully ccw) to maximum (fully cw).
The outer (rear) knob is the COPILOT VOX control, that controls VOX for the copilot
and passengers. For full information on VOX operation, see section 3.3.3 below.
3.3.3 VOX Operation
The VOX control is used to set the level of audio required to activate the microphones.
The AA83-001 provides three modes of intercom operation, selected by the position of
the VOX control.
LIVE ICS
When the VOX control is positioned fully ccw to the LIVE position, all mics
will be live, and any sound picked up will be processed by the ICS system
(hot mic).
KEYED ICS When the VOX control is positioned fully cw to the MAX position, 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.
3.3.4 Annunciator
The front panel annunciator is a bi-colour LED that shows intercom status.
If the LED is illuminated green, it indicates transmit activity, and if it is red, it indicates
VOX activity. For transmit with sidetone or mic activity, it will illuminate amber. The
green LED also indicates a possible stuck mic if still lit after transmission is concluded.
Feb 8, 2006 Page 3-3
ENG-FORM: 806-0106.DOT
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