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1.
PLANNING
1.1
Placing the Antenna Unit
General
Interfering objects (especially metallic objects such as 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 selecting a
mounting location for the antenna unit.
Secure unobstructed path in all directions
The ideal mounting location secures an unobstructed path between the antenna unit and
the satellites, from horizontal to zenith. In order words, whatever the direction the antenna
unit is pointing there are no interfering objects within the main beam (16°). While this might
be feasible on some vessels, on others it is impossible due to space considerations. The
antenna unit should be located at least 3 meters away from masts having a diameter less
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
4 to 10 Hz
10 to 15 Hz
15 to 25 Hz
25 to 33 Hz
Half Vibration
Maximum amplitudes
Max. Amplitude
2.54 mm (max. 9.8 m/s²)
0.76 mm (max. 6.86 m/s²)
0.40 mm (max. 9.8 m/s²)
0.23 mm (max. 9.8 m/s²)
1
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