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1. MOUNTING
1-7
1.1.2 FAR 2837SW/2837SW-D antenna unit
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, exerting excessive levels of stress at the base of the radiator,
which can damage the radiator. To prevent this, relocate the antenna unit, or if relocation is
not possible, reinforce the platform.
Mast for
DF, etc.
Remarkable vibration
(pitching)
Mounting
position
EXAMPLE
Mast of DF
Mount the antenna unit
directly on the mast or on the
platform, as near as possible
to center of the mast.
Mounting of S-band antenna unit