98-175666-A
Appendix E: Grounding and RF protection
E-6
Grounding Recommendations
The ground connection must be established at a dedicated RF ground (either capacitive or
electrical coupled).
To ground the ADU
If the mounting base of the ADU is electrically connected to any other ground potential
than the BDU (e.g. Lightning Ground), the ADU must be isolated at its mounting bolts by
means of shoulder bushings and washers - see section .
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 BDU Grounding kit. A heavy
gauge wire with tinned strands (min. 6 mm
2
) can be used for this purpose.
E.2.6 Separate ground cable
Ground cable - construction
When dealing with electrical installations in a marine environment, all wiring must be done
with double insulated, tinned strands, high quality and if exposed also UV resistant cables.
This shall also apply to the separate ground cable mentioned in the previous paragraphs.
The ground cable is constructed using an appropriate cable with a cross section area of at
least 6 mm
2
(AWG10) and terminated with insulated ring crimp terminals – see illustration
Important
Bear in mind that the ADU ground connection is to be
made at the
same electrical ground potential
as
the BDU (see
).
Figure E-5: Alternative grounding for fiberglass hulls
Terminal
RF Ground Plate
Heavy Gauge Wire
-
+
Antenna
Terminal Grounding Kit
