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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 clear-
ance for the radiator, the antenna unit, because of its weight, will swing 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 antenna unit, or if relocation is not possible rein-
force the platform.
Mounting precaution for S-band antenna unit
Mast for
DF, etc.
Mount antenna unit
directly on mast or on
a platform, as near as
possible to center of mast.
Mast for DF
Remarkable vibration
(pitching)
Mounting
position
EXAMPLE