Chapter 3: Service & maintenance
Diagnostics 67
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Most of the messages are marked as TU (transceiver unit) or ATU (Antenna
Tuning Unit) messages.
Text in the
display
Explanation Possible cause(s)
Low Tune Power Too little power reaches
the antenna tuner to tune
properly.
Poor antenna installation or
cable
High Tune Power Too much power reaches
the antenna tuner.
Standing waves may be
present
TU: Power Low Too low power compared
to expected.
Poor installation or too short
antenna, etc.
TU: Power High Too high power output
from transceiver unit.
Defective power loop,
transmitting single tone, etc
TU: High Low-
Power
Low power mode
transmits with more
power than expected.
Reflections on cable or
standing waves, etc.
TU: High Temp Transmitter overheating. Poor ventilation. Very hot
ambient temperature or
prolonged transmission.
TU: High SWR* Transmitter sees a high
Standing Wave Ratio
(SWR).
Poor antenna, cable, fittings or
grounding of the installation.
Can temporarily occur if ice or
water is present on the
antenna or during tuning or in
rough sea and wind.
TU: Low Power Transmitter reduced
power.
Protection due to overheating
or prolonged transmission
TU: TX Inhib. Transmission inhibited. TX_INHIBIT switch is set or a
severe protection of the
transmitter has set in
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