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0638.420-071 Issue 06 02/2021 VHF Transceiver 17
• Excessive pulses on the DC bus of the aircraft can cause
damage on electrical circuits of any installed instrument.
• Do not turn on the device during engine start or shutdown.
• Turn the volume knob clockwise to turn on the device.
• After power-on, the device starts a self-test (PBIT).
o The display shows the message "WAIT".
o The display shows the software versions of the control head and the
chassis module.
• If there is an error the display shows the message "FAILURE, push any
key" (for details see "Warning and Failure Indications", page 36).
• If there is no error the transceiver changes to the last active mode before
power off.
• During normal operation, a self-test (CBIT) permanently examines the
correct operation of the device.
o If there is an error the display shows an error message.
• If PTT (Push To Talk) inputs are inactive, the transceiver stays
in receive mode.
• A mixed signal is supplied on the headphone(s) outputs (if
enabled), it is mixed of the:
o Received signal from antenna.
o Intercom signal from intercom circuit one and two.
o Signal from auxiliary input.
• A mixed signal is supplied on the speaker output (if enabled), it
is mixed of the:
o Received signal from antenna.
o Signal from auxiliary input.
• The signal from the auxiliary input is muted under certain
conditions (for details refer to "Auxiliary Audio Input (AUX
INPUT)", page 30).
• The signal from intercom is muted under certain conditions (for
details refer to "Intercom Operation", page 30).
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