Raymarine RA1072HD, Installation Manual

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16
1.6 Setting the radiation plane
The digital radar unit should be mounted so that the array rotates
parallel to the waterline. The radar beam is approximately 25° wide
in the vertical direction, providing good target detection during the
vessel’s pitching and rolling.
Planing hull vessels, and some displacement hull vessels, adopt a
higher bow angle when the vessels is at its cruising speed. In many
cases this substantially alters and raises the radar’s main radiation
plane, and can cause poor detection of nearby targets. It may be
helpful to lower the radar beam back towards the parallel, by
shimming the rear of the digital radar, so that the beam points
slightly downwards with respect to the waterline when the vessel is
at rest.
12.5°
12.5°
Waterline
Ideal Radiation Plane
D10488-1
Wedge or
washers
Using shims to lower the main beam
Forward
D10489-1