Furuno FELCOM250, Руководство по установке

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1-1
1. HOW TO INSTALL THE UNIT
1.1 Antenna Unit
General
Interfering objects (especially metal objects like masts) near the antenna can, in the
worst case, prevent reception or transmission. Further, RF radiation from the antenna
will affect the human body. Keep these and the following guidelines in mind when se-
lecting a mounting location for the antenna unit.
Secure unobstructed path in all directions
The best mounting location secures an unobstructed path between the antenna unit
and the satellites, from horizontal to zenith. In other words, whatever the direction the
antenna unit is pointing there are no interfering objects within the main beam (22° for
FELCOM 500, 40° for FELCOM 250). While this might be feasible on some vessels,
on others it is impossible due to space considerations. Locate the antenna unit at least
three meters away from masts having a diameter more than 15 centimeters.
Select a location low in vibration
The maximum permissible vibration amplitude in three axis direction should be as
shown in the table below. Consult with the shipyard to determine the mounting location
which meets the requirements shown in the table.
Freq. Range Max. Amplitude
4 to 10 Hz
2.54 mm (max. 9.8 m/s
2
)
10 to 15 Hz
0.76 mm (max. 6.86 m/s
2
)
15 to 25 Hz
0.40 mm (max. 9.8 m/s
2
)
25 to 33 Hz
0.23 mm (max. 9.8 m/s
2
)
NOTICE
Do not apply paint, anti-corrosive sealant or contact spray
to coating or plastic parts of the equipment.
Those items contain organic solvents that can damage coating
and plastic parts, especially plastic connectors.