Chapter 3: Service & maintenance
Diagnostics & troubleshooting
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Ser
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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
bad cable etc.
High Tune Power
Too much power reaches
the antenna tuner.
An error in the power loop or
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
TU: High Low-
Power
Low power mode transmits
with more power than
expected.
Reflections on cable or standing
waves, etc.
TU: Bias
Too high supply voltage.
Defective DC power supply
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