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Post by pete on Mar 13, 2007 22:32:35 GMT 1
I have a radar and want to fit a radar reflector (Echomax E230) just above it and to the rear (on a seperate bracket), anyone know what angle the radar comes out at from the 2kw Raymarine dome, I don't want the reflector to screw up my radar and give me one big white blob  Thanks, |
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Post by spottydog on Mar 13, 2007 23:42:29 GMT 1
Between 4 & 5 deg. Probably best to have the reflector as far as poss away from the radome. Surprised you didn't go for the Seame reflector?
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Post by pete on Mar 14, 2007 0:25:13 GMT 1
The seame reflector is active (powered), so doesn't transmit when you are anchored up or power is off, plus I don't like the way they plaster their name all over it, it looks cheap and tacky (although £499 plus fitting is NOT cheap) I will try and post some pics to show you my plan But my plan may look even tackier ;D |
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Post by pete on Mar 14, 2007 0:54:02 GMT 1
Just realised I am in the public area, so no pics for here, I will post them in the safety of the members only zone |
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Post by NigeL on Mar 14, 2007 9:31:59 GMT 1
Between 4 & 5 deg. Probably best to have the reflector as far as poss away from the radome. Surprised you didn't go for the Seame reflector? ?? Vertically a radar beam is a lot more than that has to be to be able to work with ship / yacht rolling / pitching etc. Best way to think of it is like a Lighthouse beam .... Horizontally it is spilt into main + side "lobes" ... main powerful central which should be extremely narrow and then very weak lobes either side which are discounted by machine. The longer the antena - normally the better resolution of beam width. Worth reading through : diraux.cgaux1sr.org/small-boat/310ch1.pdfIf you suffer insomnia !! |
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Post by NigeL on Mar 14, 2007 9:36:49 GMT 1
One immediate effect you will have ... is the biggest blind spot on that bearing from the scanner extending horizintally over the width of the reflector.
Not only that but you may suffer extreme shadow sector from the reflector due to beam-width and reflections.
Yes you will have flooding of return signal ... but as long as distance is reasonable then the weak lobes either side of beam shouldn't cloud the returns ..
I would normally think in terms of one on top of other instead of horizontal displacement .... look at Pilot boats etc.
If you go on a commercial ship - you will see blind and shadow diagrams of radars fitted .... due to masts / sat domes etc.
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