98-175666-D Appendix E: Grounding and RF protection E-3
Grounding Recommendations
electrical contact to the hull. Use serrated washers when securing the mounting bolts
and seal the joint with protective coating to avoid corrosion.
It is always recommended to establish the shortest possible grounding path e.g. on
steel hulls the ADU should be grounded directly to the hull
3
. 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.
E.2.3 Alternative grounding for steel hulls
The following guidelines assume a two-wire, isolated grounding arrangement; that is
no part of the circuit, in particular the battery negative, is connected to any ground
potential or equipment.
To ground the BDU
The BDU should preferably be grounded to the ship with the short cable. Further, the
BDU must be grounded at its grounding stud in order to ensure a proper grounding if
the short ADU cable is disconnected.
The ground connection can be established either at the hull (recommended) or at a
dedicated RF ground if available (alternative).
The BDU provides galvanic isolation (as required) from its input power terminals to the
chassis/grounding stud. This way the isolated grounding arrangement is maintained.
Figure E-2: Grounding the ADU
Note
For optimum grounding use the mounting bolt located
closest to the ADU cable plate, see To ground the ADU on
page 2-21.
3. Please note that the ADU ground connection is made at the same electrical ground
potential as the BDU.
Antenna bottom
Mounting base
M12 bolt
Serrated washer
(stainless steel)
(stainless steel)
Important
However, bear in mind that the ADU ground
connection is to be made at the same electrical
ground potential as the BDU (see To ground the
ADU).
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