Nat AA12 Installation And Operation Manual - page 38
AA12 Compact Audio Controller Manual
SM21 Rev. 4.10
Page 3-2
Sep 9, 2004
ENG-FORM: 806-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.3.2
Receive Audio – AA12-002/AA12T-002
The AA12-002 is typically configured to select the receive (RX) audio from three
transceivers. The RX select switches are two-position toggle switches.
Transceiver audio can be selected by setting the applicable RX select switch to the up
position, and deselected (turned off) by setting the applicable RX select switch to the
down position. It can also be selected as a function of the transmit (TX) select switch.
The transceiver that is selected by the TX select switch is automatically selected for
receive as well.
An additional Direct Audio input (unswitched) is provided for airframe warning, rad alt, or
other high priority audio signal.
3.3.3
Transmit Selection
The rotary TX select switch provides radio selection for up to three transceivers (1, 2, 3)
and a PA. The AA12 is activated for TX operation by selecting the desired transceiver
on the rotary TX select switch and pressing the external TX PTT switch. This connects
the active MIC to the selected transceiver. The front panel annunciator illuminates
green to indicate TX operation.
RX Select Switches