Anodyne Electronics Manufacturing AA83-001 Installation And Operation Manual - page 21
AA83-001 Int
erMUSIC™ Stereo Intercom System
SM09-2 Installation and Operation Manual
April 17, 2012 Rev: 5.00
Page 3-3
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
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. The
pilot has no ICS or music operation when selected to PIL ISO, and all his signals are presented in mono
format during this mode.
This mode is 'fail-passive', meaning that it requires no power to operate and is the same mode the box
goes into automatically when power is lost to the AA83-001. In this way, switch over is immediate for
the pilot and there is no possibility of lost communication because of a lack of pilot action. Note that the
pilot's boom mic is sent directly to the radio in this mode, and only a PTT key input is needed to transmit.