Furuno MARINE RADAR 1823C - Manual (Page 35)

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9. Attach connectors of the antenna cable as appropriate, and then fasten a pan head
screw M4x10 to fix shield cable and core case (removed at step 6.)
Antenna unit, connector location and fixing the shield cable w/core case
10.Put EMI core on antenna cable into the core case attached at step 9.
A flat side of core should be faced downward.
EMI core
Core case
EMI core, putting into core case
11.Refasten the shield plate and core case cover with 15 screws. Be sure that the cable
from the rotation detector passes through the notch between the two cable ties.
How to pass the rotation detector cable