Alternative grounding for fibre glass hulls
F-6 Appendix F: Grounding and RF protection 98-150471-A02
F.5 Alternative grounding for fibre glass hulls
F.5.1 To ground the ACU
The ACU should preferably be grounded with the short ADU cable and a grounding kit
(available from Thrane & Thrane). Further, the ACU must be grounded at its grounding stud
in order to ensure a proper grounding if the short ADU cable is disconnected.
The ground connection must be established at a dedicated RF ground (either capacitive or
electrical coupled).
F.5.2 To ground the ADU
If the mounting base of the ADU is electrically connected to any other ground potential
than the ACU (e.g. Lightning Ground), the ADU must be isolated at its mounting bolts by
means of shoulder bushings and washers - see section F.6.3.
However, a ground connection must be established via one of the mounting bolts using a
separate ground cable. The ground cable must be routed parallel and in close proximity to
the shielded coax cable hence connecting the ADU to the ACU Grounding kit. A heavy
gauge wire with tinned strands (min. 6 mm
2
) can be used for this purpose.
Bear in mind that the ADU ground connection is to be
made at the same electrical ground potential as
the ACU (see To ground the ADU).
Figure F-5: Alternative grounding for fibreglass hulls
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