r Speaker muting switch ON/OFF
Call up function SF 12 using the MDE key. The following displays
appears :
Top line SF12
Bottom line OFF or On
OFF = Speaker muting on
On = Speaker always switched on
Select the function using the kHz switch. Store the required function by
pressing the STO key. This selection becomes active after ending the
service mode.
r Indication the software version and change status
Call up function SF 13 using the MDE key (4). The following displays
appear :
left LC display (7) Software version and change status :
Microprocessor
right LC display (8) Software version and change status :
CO-Miroprocessor (PIC)
r Ending of the service mode
The VHF transceiver must be switched off to end the service mode.
Page 28 Issue 10/95
Operating Instructions
SAFETY INFORMATION
l
A speech test is to be performed before startup and it
should be noted that if the speech test is carried out close
to the ground station the results may be positive even if
the antenna cable is broken or short-circuited. At a
distance of 5 to 10 km no connection will be made.
l
Use a loud voice for speech communication and hold the
microphone close to the lips. Otherwise cabin noise can
be intrusive and make understanding difficult.
l
Use only microphones or headsets which are suitable for
use in aircraft. In aircraft made of wood or synthetic
materials or in gliders or helicopters, incoming radiation on
the equipment antenna can affect the integrated amplifier
of the microphone (feedback). This is noticeable in the
ground station by whistling and/or heavy distortion. The
described disturbances can occur in different ways on the
different transmission channels.
l Transmit buttons can stick and cause continuous
transmission. Therefore, when transmitting ensure that the
green LED disappears when the transmission button is
released.
Issue 10/95 Page 5
Becker AR 3209
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