Northern Airborne Technology AA95-766 - Manual (Page 32)

AA95-766 Single Channel Audio Controller Manual SM95-766 Rev. 2.00
3.3.1
Receive Audio Select Switches
The transceiver receive audio select switches (white switch bats) are two position switches.
The relevant transceiver receive audio is selected ON when the switch is set to the ‘up’
position, and when set to the ‘down’ position it is selected OFF.
The NAV receive audio select switches (blue switch bats) are three position switches.
When set to the ‘up’ or ‘down’ position, the relevant NAV receive audio is selected on.
When set to the ‘centre-off’ position, the relevant NAV receive audio is selected off.
The master receive volume control (RX VOL) adjusts all receive audio concurrently from
1% to full. It is important to set the individual radio volume controls to a nominal level,
and then use the master receive volume on the audio controller to adjust for changing
flight conditions.
When the red mode switch is set to NORMAL, the passengers will hear the radio audio
as selected on the controller. The passengers will not hear any radio audio when the
red mode switch is in the ISO/EMR position. All receive audio is muted during transmit
(normal mode).
3.3.2
Transmit Selector Switch
Transmit Selector Switch
TX Indicator
The transmit selector switch is a six-position switch used to select the desired transceiver,
and when rotated fully clockwise it selects the PA function. When the hand mic or
transmit PTT switch is activated, the mic will be coupled to the radio (or PA) selected.
The pilot has priority over the copilot during transmit operations.
Receive audio for the transceiver selected is automatically activated as a function of the
rotary selector switch, and no additional switching is needed to establish outside
communication. During transmit, all audio selected is muted except the sidetone of the
transceiver in use. Direct Audio is also muted during transmit.
The front panel TX indicator will illuminate green when either the pilot or co-pilot
transmits. It will not light when the hand mic (if installed) is used.
Page 3-2 Dec 6, 2004
ENG-FORM: 806-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.