Antenna Unit Installation Considerations - Furuno FAR-1513 Installation Manual

1. INSTALLATION
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Antenna Unit Installation Considerations

• The antenna unit is generally installed either on top of the wheelhouse or on the ra-
dar mast, on a suitable platform. Locate the antenna unit in an elevated position not
interfered by any shipboard structure.
(a) Bridge
• A line of sight from the antenna unit to the bow of the ship must hit the surface of
the sea in not more than 500 m or twice the ship's length, depending whichever val-
ue is smaller, for all load and trim conditions.
• Install the antenna unit so that any blind sectors caused by objects (mast, etc.) are
kept to a minimum. A blind sector must not exist in arc of the horizon from right
ahead to 22.5° aft of the beam to either side (see Figure 1 below). Also, individual
blind sectors of more than 5° or the total arc of both blind sectors of more than 20°,
must not occur in the remaining arc (see Figure 2 below). Note that any two blind
sectors separated by 3° or less are regarded as one sector.
270°
22.5°
• Do not install the antenna where extreme winds may strike the port and starboard
sides of the antenna.
• Install the antenna unit away from interfering high-power energy sources and TX ra-
dio antennas.
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less than 500 m or twice the ship's length
Figure 1
90°
22.5°
(b) Common mast
Figure 2
a, b, c: less than 5° respectively a, b, c: less than 5° respectively
a+b+c+: less than 20° a+b+c+: less than 20°
less than 3°
(c) Radar mast