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1. MOUNTING THE UNIT
1.1
Antenna Unit
Mounting Location
• Mount the omnidirectional antenna unit high atop a mast clear of stays and the turning
diameter of a radar antenna. The ideal mounting location would be where no obstacle
appears in the fore and aft directions down to -5º and down to -15º in the port and
starboard directions. This concept is illustrated in the figure below. Shadow sector of the
antenna mast, whip antenna, etc. should be within 2 degrees at one meter from the
antenna unit.
• If both Inmarsat-A/B and Inmarsat-C ship earth stations are installed, separate the
Inmarsat-A/B antenna at least 8 m from the Inmarsat-C antenna.
• Separate the antenna unit from an S-band radar as follows:
2 m
5
5
Antenna unit mounting location
INSTALLTION
ZONE
15
2 m
5 m
S-band radar
S-band radar and installation area
ANTENNA UNIT
15
Install above this line
PROHIBITED
ZONE
1.5 m
HORIZONTAL LINE
1
15
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