Alternative grounding for aluminum hulls
F-6
Appendix F: Grounding and RF protection
98-133966-G1
F.4
Alternative grounding for
aluminum 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.
F.4.1
Grounding the ACU
The ACU should preferably be grounded with the short cable. Further,
the ACU must be grounded at its grounding stud to ensure a proper
grounding if the short ADU cable is disconnected.
The ground connection must be established at a dedicated RF ground
(either capacitively or electrically coupled).
The ACU provides galvanic isolation (as required) from its input power
terminals to the chassis/grounding stud. This way the isolated
grounding arrangement is maintained.
F.4.2
Grounding the ADU
If the mounting base of the ADU is electrically connected to the hull (or
any other ground potential than the ACU), the ADU must be isolated at
its mounting bolts by means of shoulder bushings and washers, see
F.6.3. This is done in order to prevent DC currents flowing in the hull
thus causing electrolytic corrosion.
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.
Important
Remember to make the ADU ground connection at the
same electrical ground potential
as the ACU (see
).
SAILOR900TM.book Page 6 Monday, September 16, 2013 11:01 AM
Summary of Contents for Sailor 900 VSAT
Page 2: ...98 138976 A Cover_SAILOR 900 VSAT System_407090B indd 2 15 04 2013 15 54 39 ...
Page 28: ...List of tables xxvi 98 133966 G1 SAILOR900TM book Page xxvi Monday September 16 2013 11 01 AM ...
Page 257: ...Appendices SAILOR900TM book Page 1 Monday September 16 2013 11 01 AM ...
Page 258: ...SAILOR900TM book Page 2 Monday September 16 2013 11 01 AM ...
Page 355: ...98 138976 A Cover_SAILOR 900 VSAT System_407090B indd 3 15 04 2013 15 54 40 ...