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Why Add A Radar Tower?

Old 03-02-2013, 10:52 AM
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Default Why Add A Radar Tower?

I just picked up a used Raymarine Display and now a used 2KW Radome.

I see that a lot of folks use a 5" tower.

Why?

Does this enhance performance? Is it looks?

Can't figure out the purpose.
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Old 03-02-2013, 10:58 AM
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Depending on the angle of your hardtop and the riding angle of your boat, a radome mounted directly on the hardtop may or may not be close enough to horizontal when you are operating. (Entirely separate discussion as to being on plane or going slowly at night or in low visibility).

If the radome is angled up at the front, then you may not see close in targets on the bow, or lose targets as they get close.

So, if a "wedge" is needed to change the angle, many folks choose to do that with a short pedestal instead of a surface wedge. Can also raise the radome enough to reduce the risk to GPS receivers mounted close to the radome.

In short, I believe it is done more often for angle than height.

Brian
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Old 03-02-2013, 11:04 AM
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Interesting. Looking at towers, it appears that the base and top are parallel. I just the angle is slight.

Is there a preferred mount? Seaview, Edson, Power Tower?
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Old 03-02-2013, 11:55 AM
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OCNSLR has it right. It is mainly used to get a better angle (or clear any obstructions on your hard top). You want to get the angle horizontal at whatever speed you will normally be running. I actually prefer a slight down angle, think it gives a better close in picture.
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Old 03-02-2013, 01:49 PM
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So is a tower recommended?
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Old 03-02-2013, 03:24 PM
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The most commonly used angle is 4 degrees - very slight and yes, like VHF, radar is line-of-sight so elevating it will let you look farther - curve of the Earth. I think the horizon at sea level is just 13 miles or so. So even a 2kw (24 mile) radar can benefit from elevated mounting.

Looked it up. It's even less than 13 miles: http://en.wikipedia.org/wiki/Horizon
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Old 03-02-2013, 05:23 PM
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For all the reasons stated above and it also gets the area of radiation coming out of your scanner father away from you for health reasons. Some will tell you some of the new type radars are safe as far as there transmissions go. I don,t think any extra radiation is a good thing.
Also as someone already stated the higher you mount the scanner the better you radar horizon. If you want to work out your radar horizon work out the height of your scanner in feet, get the square route of that number and multiply it by 1.23. The answer is you radar horizon in nautical miles.
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