Join Date: Jul 2002
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2kw vs 4 kw radar
At what height will your array be mounted? Using that and computing distance to the horizon, I''m guessing you''ll be well inside 10 NM. Add on some add''l distance for picking up a ship''s superstructure and you remain well inside the range of a 2kw 18" array in e.g. an SL72. IMO the advice you''re getting is one reason we tend to hear how much more expensive a bigger boat is than a smaller one - we upgrade the bigger boat because it''s bigger (not out of need) while tending to downsize things on a smaller boat, a good example being nav lights, as tho'' smaller boats need to be seen less or at less distance than bigger ones. You''ll get better between-target definition with the wider array at very close ranges but I find it tough to make a good case for a 4kw unit mounted 20-30'' above sea level.
OTOH the MARPA computational abilities of the upscale units are very impressive and provide add''l help to a short-handed crew. But you''re right - that''s substantially more expense.