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1. MOUNTING
1.1 Scanner Unit
Mounting considerations
• The scanner unit is generally installed either on top of the wheelhouse or on the radar mast,
on a suitable platform. Locate the scanner unit where there is a good all-round view.
(a) On bridge (b) Common mast (c) Radar mast
Figure 1-1 Mounting methods
• No funnel, mast or derrick should be within the vertical beamwidth of the scanner in the bow
direction, especially zero degrees ±5°, to prevent blind sectors and false echoes on the radar
picture.
• It is rarely possible to place the scanner unit where a completely clear view in all directions
is available. Thus, you should determine the angular width and relative bearing of any shadow
sectors for their influence on the radar at the first opportunity after fitting.
• Locate the antenna of a direction finder clear of the scanner unit to prevent interference to
the direction finder. A separation of more than two meters is recommended.
• To lessen the chance of picking up electrical interference, avoid where possible routing the
signal cable near other onboard electrical equipment. Also avoid running the cable in paral-
lel with power cables.
• A magnetic compass will be affected if placed too close to the scanner unit. Observe the
following compass safe distances to prevent deviation of a magnetic compass: Standard
compass,1.70 m (FR-2815), 2.10 m (FR-2825), Steering compass, 1.90 m (FR-2815), 1.20
m (FR-2825).
• Do not paint the radiator aperture, to ensure proper emission of the radar waves.
• The signal cable run between the scanner and the display is available in lengths of 15 m
(standard), 20 m, and 30 m. Whatever length is used it must be unbroken; namely, no splic-
ing allowed.
• The scanner base is made of cast aluminum. To prevent electrolytic corrosion of the scanner
base, use the seal washers and corrosion-proof rubber mat and ground the unit with the
ground wire (supplied).
• Deposits and fumes from a funnel or other exhaust vent can adversely affect the aerial per-
formance and hot gases may distort the radiator portion. The scanner unit must not be mounted
where the temperature is more than 70°C.
• Leave sufficient space around the unit for maintenance and servicing. See the scanner unit
outline drawing for recommended maintenance space.