117
Symptoms
Descriptions / Remedial Actions
Signal Strength
is low or too
low ( less than
45dBHz )
• Check any obstruction such as the hull or monkey bridge of the
vessel that may block the ADU’s line of sight.
• Check any interference signal from the antennas that are closed to
the antenna.
• Depending on the antenna’s location on the vessel, the vessel’s
route may cause the ADU’s line of sight to be blocked any structure
of the vessel, depending on the elevation of the satellite.
Symptoms
Descriptions / Remedial Actions
No light appear
on Terminal LED
• Check to ensure that the input DC power will have at least +24V DC,
10A or +12V DC, 20A.
• Check to ensure the circuit breaker at the panel is fully depressed at
“ON“ position.
Symptoms
Descriptions / Remedial Actions
Antenna keeps
searching
for satellite
continously
• Check that the sky/satellite view of ADU is not blocked.
• Wait a little bit longer. A FB terminal has to scan through the three
I-4 satellites (Americans, EMEA and Asia- Pacific) one by one to
look for BGAN signal to operate on. Depend on location of vessel,
this process can take as long as 6 minutes.
• Check that the FB terminal is NOT configured to lock to a particular
I-4 satellite (Manual Satellite Selection) that can’t be seen (by ADU)
at current location.
Symptoms
Descriptions / Remedial Actions
Antenna does
not move or
rotate
• Check the BDU is powered up by looking the LEDs, which are green.
• Check the output voltage at the antenna connector at the BDU is
+43V.
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