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Antenna Location
It is important for the operation and life of the Antenna and safety of personnel that the
location / mounting / fitting instructions are followed – improper installation will void any
warranty.
Mounting Location:
The Above Deck Unit (ADU)
18
Revision 1
Line-of-Sight: when locating the antenna, it is very important to ensure
there is a clear line-of-sight to the satellite for all the satellite elevation
angles in the region in which the ship will operate. The antenna rotates
360° and down to –25° for pitch and roll to allow for continuous pointing
even in heavy sea conditions. Any obstructions within this arc can cause
some signal degradation. The amount of degradation depends on the size
of the obstruction and the distance from the antenna but in general any
obstructions within 3 meters (10 feet) of the antenna should be avoided.
Obstructions less than 150 mm (6 inches) in diameter can be ignored
beyond this distance.
Radar: DO NOT install the antenna on the same plane as a Radar
Antenna – the High Power Radar signal can damage or overload the
antenna front-end circuits – the Antenna must be mounted above or below
the Radar beam – See following tables of recommended distances
depending on the type of Radar(s) used.
Antenna Location – minimum distance from RADAR
in istance
Radar
Power
vertical separation
Output
0-10kW
0.4 m (1.3 ft.)
30kW
1.0 m (3 ft.)
50kW
2.0 m (6.6 ft)
(S-Band)
Min Distance at 6
vertical separation
0.4 m (1.3 ft.)
0.5 m (3 ft)
1.0 m (3.3 ft)
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