Furuno FAR-3230S(-BB) Installation Manual page 15

1.1.2 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.
1.1.3 How to assemble the antenna unit
The antenna unit consists of the antenna radiator (w/antenna support) and the anten-
na unit chassis, and they are packed separately. Fasten the antenna radiator to the
antenna unit chassis as follows:
1. Remove the protective waveguide
cap from the waveguide on the ra-
diator bracket.
2. Put the radiator on the radiator bracket so the guide pins of the antenna support
fits into the guide pin holes on the radiator bracket. (Orient the logo of the radiator
to the side with bow mark on the bracket. If reversely oriented the radiator cannot
be set to the bracket.)
Antenna radiator
Antenna support
Antenna unit chassis
3. Coat the threads of eight hex bolts (M12×50, supplied) with marine sealant sup-
plied.
Mast for DF, etc.
Remarkable
vibration
(pitching)
Mounting
position
EXAMPLE
Mast for DF, etc.
Guide pin holes Guide pin holes
Front
1. INSTALLATION
Mount the antenna
unit directly on the
mast or on the
platform, as near as
possible to center of
the mast.
Waveguide cap
Radiator bracket
Antenna shassis
Bow mark Bow mark
Bow Bow
1-3