Northern Airborne Technology AMS43 TSO - Manual (Page 25)

AMS43 TSO Single Channel Audio Controller
SM27 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-2
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, 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.
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. When rotated
fully clockwise, this switch 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.
The front panel TX indicator will illuminate green when either the pilot or co-pilot transmits. It will not light
when the hand mic is used.
ENG-FORM: 806-0115.DOT
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