Northern Airborne Technology N301A - Manual (Page 24)

N301A-000 Audio Controller
SM45 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-1
Section 3 Operation
3.1 Introduction
Information in this section consists of the functional and operational procedures for the N301A-000 Single
User Audio Controller.
3.2 General Information
The N301A-000 audio controllers provide central adjustment for all the aircraft audio. They allow
selection of transmit and receive audio, and HOT, VOX or PTT intercom.
The ICS operation ensures that after external radio transmission, the user’s microphone automatically
reverts back to intercom mode.
Four direct inputs are provided to allow warning/alerting audio to pass unmuted to the pilot's headset.
Two of the inputs are adjustable, through the RADIO volume control, located on the front of the unit.
3.3 Controls and Indicators
3.3.1 Transmit Selection
COM3
COM4
COM5
COM2
NORM
EMER
ICS
TX
RADIO ICS HOT VOX
DME
MKR
ADF1
ADF2
NAV1
NAV2
RX-ON
AUX
PVT
Transmit Selector TX annunciator
The eight-position rotary transmit selector switch in the lower left of the panel selects the transmit function
desired. When the cyclic transmit switch is activated, the microphone will be coupled to the radio or
intercom channel selected.
Receive audio is automatically selected with the transmit selection, and no additional switching is needed
to establish outside communication.
During radio transmit operations, the green LED TX annunciator on the front panel will light, except for
PVT or ICS selections.
ENG-FORM: 806-0112.DOT
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