98-175666-A
Appendix E: Grounding and RF protection
E-2
Grounding Recommendations
E.2 Grounding Recommendations
E.2.1 To ground the BDU
The BDU should be grounded to the ship/hull. For this purpose you may use a short ADU
cable and a grounding kit. Further, the BDU must be grounded at its grounding stud in order
to ensure proper grounding if the short ADU cable is disconnected. For further information,
see
If you use the Extended cable support, make the ground connections through the cable
support. You may need to extend the ground plane using copper foil, see the following
section.
To extend the ground plane
In some cases it may not be possible to access the hull and at the same time place the BDU
in a suitable place. A way to insure good grounding and at the same time make it possible to
ground the coax cable - is to extend the ship ground plane by means of copper foil. The
maximum length of the foil is determined by the width of the foil:
Copper foil 5 cm wide: Max 50 cm
Copper foil 10 cm wide: Max 100 cm
Copper foil 20 cm wide: Max 200 cm
Connect the foil to the hull by plenty of screws or hard–soldering. Run the foil past the
place where the short ADU cable is to be grounded and mount a grounding kit on top of the
foil. For details on the jumper cable see
E.2.2 To ground the ADU
You can ground the ADU 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
Note
The foil must be at least 0.1 mm thick.
Figure E-1: Extending the ground plane
Jumper cable
Cable to ADU
