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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.
• 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 direc-
tions 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 parallel 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, 4.8 m, Steering compass, 3.6 m.
• 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, 30 m and 60 m. Whatever length is used it must be unbroken;
namely, no splicing allowed.
• Deposits and fumes from a funnel or other exhaust vent can adversely affect the aerial
performance and hot gases may distort the radiator portion. The scanner unit must not
be mounted where the temperature is more than 70°C.
• 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).
• Leave sufficient space around the unit for maintenance and servicing. See the scanner
unit outline drawing for recommended maintenance space.