Recommendations
C-2 Appendix C: Ground and RF protection 98-148248-C
2. Further, the ACU must be grounded at its grounding stud in order to ensure proper
grounding if the short ADU cable is disconnected. For further information, see To
ground the ACU on page 3-23.
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.
C.2.1.1 To extend the ground plane
In some cases it may not be possible to access the hull and at the same time place the ACU
in a suitable place. A way to ensure 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
Do as follows:
1. Connect the foil to the hull by plenty of screws or hard–soldering.
2. 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 Jumper cable for
grounding on page C-12.
Per used jumper cable the maximum cable length of the cable to the antenna is reduced by:
• Enviroflex 400: 1.25 m
• SPUMA 400-FR: 6 m
• SUCOFEED 1/2" FR: 10 m
The foil must be at least 0.1 mm thick.
Figure C-1: Extending the ground plane
Jumper cable
Cable to ADU
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