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Radar mast mounting positions?
Our radar randome is up about 40 feet from the deck, mounted facing forward. We seem to have good coverage in all directions, though it would be hard to tell, seeing that the potential "dead" spot is always behind us.
Mounting the unit this high gives us excellent long-range to the detriment of nearby object resolution. I''d think a bit about how you plan to use the radar (on ocean or close to land) before deciding how high to mount it.
According to one article I read <a href=http://www.sailnet.com/collections/articles/index.cfm?articleid=sexton022>here</a>, coverage decends on average at a rate of 10-15 degrees from the horizontal plane in the randome. This is why people have started mounting radar units on arches behind the helm - to improve short range performance to the detriment of long-range performance. How you feel about Microwave exposure may also influence your choice.
In our case, with a randome about 45 feet off the water, we can resolve things at a distance of 250 feet and above. Anything closer shouldn''t show up unless it is tall and/or has a radar reflector. It helps that catamarans usually sail level and hence do not require gimbal systems.