Installation Precaution For S-Band Antenna Unit - Furuno FCR-2139S-BB Installation Manual

Installation precaution for S-band antenna unit

If an S-band antenna unit is mounted near the end of a platform to provide sufficient
rotation clearance for the radiator, the antenna unit, because of its weight, swings up
and down by ship's vibration and rolling. This exerts excessive levels of stress at the
base of the radiator, which can damage the radiator. To prevent this, relocate the an-
tenna unit, or if relocation is not possible, reinforce the platform.
Mast for
DF, etc.
EXAMPLE
Mast for DF
Remarkable vibration
(pitching)
Mounting
position
Mount the antenna unit
directly on the mast or on
the platform, as near as
possible to center of the
mast.
1. MOUNTING
1-3