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Meindert Sprang
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cellphones
"Bruce in Alaska" wrote in message
...
In article ,
(Parallax) wrote:
Boat radar doesnt use a parabolic antenna with the waveguide
horn at the focal point? Why not?
Because Marine Radar Antenna's are designed to provide a very narrow
Horazontal Beamwidth, so as to descriminate small targets, and a very
large Vertical Beamwidth, so as to eliminate loss of targets due to
Heeling, Rolling, and pitching for the radar platform......
Which can also be achived with a parabolic antenna, with different
curvatures in horizontal and vertical direction. See navy ships...
So again, it all comes down to cost.
Meindert
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