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Chapter 4: Installing the ADU
4.4 ADU cables
The coaxial cable for connection between the antenna and BDU is not part of
the basic system. Make sure that a sufficient length of cable is ordered. See
Appendix A Part numbers on page 77 for cable options.
Select a suitable area for installation of the BDU, ADU and Cradle. Where
exposed to mechanical wear - on deck, through bulkheads, etc. - steel pipes
should protect the cables. Standard procedures should otherwise be followed
for cabling in ship installations.
The maximum allowed RF-loss in the Antenna cable is 10dB@1660 MHz. This
is to ensure the performance of the system. The Cable loss can be read in the
handset.
The Cable loss readout will vary mainly due to Temperature changes in the
ADU. In Table 1 below, the maximum allowed Cable loss readout are listed.
Max allowed Cable loss readout
Table 1: Maximum allowed Cable loss readout vs. ADU Temp.
During installation the Cable loss readout shall be checked. If the Cable loss
readout is above the specified maximum values the installation has to be
checked.
20
ADU temp.
ADU cables
-25°C
+22°C
80%
88%
+65°C
95%
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Troubleshooting
