Chapter 8: Installation 8-5
Selecting the
Scanner Unit
Location
8.3 Selecting the Scanner Unit Location
This section provides information that affects the possible locations of the
scanner, and its position relative to the display unit and to the power supply.
The dimensions of the scanner unit are shown in Figure 8-3.
Selecting the best location for the scanner unit requires careful consideration
of the following points, to ensure reliable and trouble free operation:
Note: In order to minimize potential interference to other systems on board
ship (EMC), it is advisable to mount the scanner on a part of the boat that is
insulated from the ship’s battery negative. If you cannot do this, and encounter
problems, you can fit insulating bushes between the scanner and its mounting
bracket.
Figure 8-3: Scanner Dimensions
• Height: The scanner unit should normally be mounted as high as practical
above the waterline, for three reasons:
• For safety reasons the scanner should be out of range of personnel, pref-
erably above head height. This avoids mechanical danger and electro-
magnetic contact, particularly with the eyes.
• Radar operates at the line-of-sight, so a high mounting position gives
better long range performance.
• Surrounding large objects, in the same horizontal plane, can interfere
with the radar signal and cause blind areas or shadow sectors and false
targets on the radar screen (see below).
D3224_4
18" Radome Scanner
151.25 mm (5.95 in)
468 mm (18.4 in) dia.
Weight: 6.5 kg (14.3 lbs)
Compass safe distance: 1 m (33 in)
116.5 mm
(4.6 in)
233 mm (9.2 in)
141.5 mm (5.6 in)
227 mm (8.9 in)
302.5 mm (11.9 in)
Rear
Rear
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