Thrane&Thrane TT-6222A VHF DSC, User Manual

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Chapter 3: Service & maintenance
50 Maintenance
DSC self test
To run a control routine DSC self test, do as follows:
1. Press the soft key SETUP . If it is not in the display, press the soft key MORE
until SETUP appears.
2. Press the arrow soft key or to advance to DSC SETUP .
3. Turn the selector knob to select DSC Self Test . Press and turn the selector
knob to select RUN .
The test will check the ability to encode/decode DSC signalling on RF level.
The radio will automatically transmit a DSC safety test call to its own MMSI
number without enabling the transmitter power amplifier. In parallel the
radio decodes and compares the received call to be the same as the
transmitted.
The display shows the result of
the test.
Press the soft key OK to acknowledge
the test result and resume normal
operation.
Important
If the DSC loopback test fails, this indicates the DSC
functionality does not work correctly — including the ability to
send a DISTRESS message.
Contact your dealer immediately for further advice.