Appendix C: Grounding and RF protection
TT-98-129218-A
Grounding Recommendations
59
Grounding Recommendations
Grounding the terminal
The terminal should be grounded to the ship/hull by means of a short antenna cable and a
grounding kit. Further, the terminal must be grounded at its grounding stud in order to ensure
proper grounding if the short antenna cable is disconnected. For further information, see
Grounding the terminal
on page 16.
Grounding the antenna
You can ground the antenna to the ship/hull via one or more of its mounting bolts. Make sure to
remove painting, dirt, grease etc. at the mounting holes in order to make good electrical contact to
the hull. Use serrated washers when securing the mounting bolts and seal the joint with protective
coating to avoid corrosion.
If you are using vibration isolators at the bolts, the grounding connection between the mounting
surface and the bolts is not sufficient. In that case mount a separate grounding wire. See
Separate
ground cable
on page 65.
It is always recommended to establish the shortest grounding path as possible e.g. on steel hulls
the antenna should be grounded directly to the hull
1
. However, due to the fact that this is not
possible on e.g. fiberglass hulls (nor is it preferable on aluminum hulls) a number of alternative
grounding methods are suggested in the following paragraphs.
1. Please note that the antenna ground connection is made at the same electrical ground potential as
the terminal.
Antenna bottom
10 mm spacer
M10 Mounting bolt
(Stainless steel)
Mounting base
Serrated washer
(Stainless steel)
