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11.1.1 Power boat installations
Normally, you should install the scanner horizontally, to produce an equal sweep around the power
boat:
However, when the power boat is traveling at high speed, the bow rises up out of the water and if the
elevation angle (trim) of the bow is raised up so that it equals, or exceeds, 50% of the vertical beam
width of the radar, this can cause two problems:
ahead of the power boat, the beam is projected too high to sweep the water surface
effectively. Targets can be missed completely or appear at a very poor resolution on the
display screen.
astern of the power boat, 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 screen.
In this case, you're recommended to install the scanner so that is tilted down at the front, at an angle
that will produce an almost horizontal sweep when the power boat is running at speed.
Northstar 25 kW Radar Installation Manual
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