Alternative ground for fibre glass hulls
C-8 Appendix C: Ground and RF protection 98-141779-G
C.5 Alternative ground for fibre glass hulls
C.5.1 To ground the ACU
To ground the ACU do as follows:
1. Preferably ground the ACUwith the short ADU cable and a grounding kit (available from
Thrane & Thrane A/S).
2. Ground the ACU at its grounding stud in order to ensure a proper grounding if the short
ADU cable is disconnected.
3. You must establish the ground connection at a dedicated RF ground (either capacitive
or electrical coupled).
C.5.2 To ground the ADU
To ground the ADU do as follows:
1. If the mounting base of the ADU is electrically connected to any other ground potential
than the ACU (e.g. Lightning Ground), you must isolate the ADU at its mounting bolts
with shoulder bushings and washers - see section C.6.3 .
2. However, you must establish a ground connection via one of the mounting bolts with a
separate ground cable.
3. You must route the ground cable in parallel and in close proximity to the shielded coax
cable hence connecting the ADU to the ACU Grounding kit. Use a heavy gauge wire
with tinned strands (min. 6 mm
2
) 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 C-5: Alternative grounding for fibreglass hulls
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