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11.1.2 Yacht installations
Normally you should install the scanner horizontally, to produce an equal sweep around the yacht.
However, a yacht heels over to the lee side, and when the heel angle exceeds 50% of the vertical beam
width of the radar, this can cause two problems:
on the windward side of the yacht, the beam is projected too high to sweep the water
surface effectively. Targets can be missed completely or appear at very poor resolution on
the display unit.
on the lee side of the yacht, the beam is projected too low and is concentrated over a small
area of water so that sea clutter becomes a problem on the display unit.
In this case, you're recommended to install the scanner on a gimbal mounting so that it can operate
effectively in a heavy swell or when the yacht is heeled over.
11.2 How to find the optimum height for the scanner
The optimum height for the scanner is as close as possible to the A-B line for best performance.
How to find the A-B Line:
The vertical extent of the radar beam is 2
θ°, so most of the radar beam is concentrated within this
angle, meaning that outside of this angle the radar beam will be very weak.
Scanner model
θ° value (half the -3 dB beam width)
2 kW 15
4 kW 12.5
6 kW 10
10 kW 10
25 kW 10
Northstar 25 kW Radar Installation Manual
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