ATR833 / P/N 833-(xxx)-(2xx)
Operation and Installation
26
Document-No.: 01.1403.010.71e / Revision: 3.01
3.4 EXT – External Audio Input’s Behavior
The external audio input can be used to feed a monaural audio signal to
the amplifier for the headsets/speaker.
An external audio signal can be used for different purposes. E.g. it is
possible to check the audio signal of a VOR receiver, to attach a traffic
sensor with acoustic output, or to use the external audio input for
(monaural) music input.
As these signals have different priorities in
comparison to radio receptions, the
priority of the external audio input can be
configured.
With the
rotary knob the following options can be selected:
always on
The external audio input is always on, even during
radio receptions and transmit mode. Use this setting
only for very high priority acoustic warnings, e.g.
collision warning beep tones.
auto off
The external audio input is automatically deactivated
during transmit mode, or when no external audio
activity is sensed.
not RXTX
The external audio input is automatically deactivated
during radio receptions or transmit mode. This
setting does not use the external audio activity
sensing, and therefore can introduce noise when no
signal source is connected.
When deactivating one PTT button and microphone for
transmissions, e.g. in order to keep passengers from
interfering with ATC communication, don’t forget to reactivate
the copilot’s PTT after end of the flight.
ACT
123.450
SBY
118.910
EXT auto off
Use this setting only when auto off does not react fast
enough for very short external audio signals!
