Northern Airborne Technology AA83-001 rev.4.10 - Manual (Page 31)

SM09-2 Rev. 4.10 AA83-001 InterMUSIC™ Stereo Intercom System Manual
3.3.4 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, the relevant 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.
3.3.5 Mode Switch
The Mode switch is a red three-position toggle switch that is used to select the
operational mode of the AA83-001.
3.3.5.1 Normal Mode
In normal use, the AA83-001 serves as a common intercommunication system for up to
four users, and a flow-through interface for connection to the ship's external
communication system. The front panel controls allow both the pilot and copilot (plus
the passengers) to set their respective VOX trigger points independently to match
different headsets or noise locations.
For normal operation, the MODE switch is set to the NORMAL (down) position. A
transmit command from either the pilot or copilot will send their microphone signal
through to the aircraft communication system. Correct operation will be indicated by the
front panel indicator lighting green.
3.3.5.2 Pilot Isolation Operation
In normal operation, the pilot, copilot, and passengers hear the same signals from the
aircraft communication system. Sometimes this is not desirable from the pilot's
perspective, such as when he needs to communicate with the tower on approach or has
a heavy traffic load, and is not interested in the discussions on the intercom.
The MODE switch has a middle position, marked PILOT ISO, which disconnects the
pilot from the internal amplifier of the AA83-001 and connects the pilot directly to the
aircraft communication system. All other users are unaffected and continue to use the
entertainment and intercom functions of the AA83-001.
Oct 20, 2004 Page 3-3
ENG-FORM: 806-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.