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Old 09-07-2015, 08:28 PM   #1
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Default Open array size vs boat size

There is an open array that would work with my current system in the classifieds. I have been satisfied with the 4KW dome.. but if the open array could be "better" I would consider it.

Boat is 28' (probably 33 OAL) enclosed pilothouse, radar would be on 3' mast on top of the pilothouse. It would be 14' off the water.

Would a 4 or 6' open array "work", Would the pitch and roll be too much?
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Old 09-07-2015, 08:37 PM   #2
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I'd put the biggest one that fits properly for the space on the t-top. I had a dome on my 25' CC, a 4' on my Venture 34 and now a 6' on my 42' CC
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Old 09-07-2015, 08:41 PM   #3
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I think a 6' antenna would look a little out of place on a 28' boat. I think a 4' is probably a better fit. Just my opinion.
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Old 09-07-2015, 08:57 PM   #4
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Originally Posted by mig888 View Post
I think a 6' antenna would look a little out of place on a 28' boat. I think a 4' is probably a better fit. Just my opinion.
I would agree, but I am looking at used until I an trade it for a 4' (or even a 3.5' if I can find it)
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Old 09-08-2015, 04:33 AM   #5
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Quote:
Originally Posted by BadgerS View Post
There is an open array that would work with my current system in the classifieds. I have been satisfied with the 4KW dome.. but if the open array could be "better" I would consider it.

Boat is 28' (probably 33 OAL) enclosed pilothouse, radar would be on 3' mast on top of the pilothouse. It would be 14' off the water.

Would a 4 or 6' open array "work", Would the pitch and roll be too much?
You did not specify which brand of electronics or the output. Generally a 6 foot open array will do a much, much better job than a 4kW dome painting smaller targets and long range targets. There is no reason it won't work from pitch and roll. Open arrays tend to be a lot heavier so you need a suitably strong mounting location.

If it is a Furuno 12kW or 25kW open array, the antenna can be swapped between 4 foot and 6 foot arrays so you might be able to find a used 4 foot array for it and not have to find a whole unit.
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Old 09-08-2015, 06:22 AM   #6
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a 6' array takes up a lot of room on most 28' boat hard tops. make sure it's not going to interfere with anything as it swings. and, as mentioned, the weight can be an issue depending on the top.
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Old 09-08-2015, 01:29 PM   #7
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Quote:
Originally Posted by BadgerS View Post
There is an open array that would work with my current system in the classifieds. I have been satisfied with the 4KW dome.. but if the open array could be "better" I would consider it.

Boat is 28' (probably 33 OAL) enclosed pilothouse, radar would be on 3' mast on top of the pilothouse. It would be 14' off the water.

Would a 4 or 6' open array "work", Would the pitch and roll be too much?
6' open array furuno works well on my 28' cc. Keep in mind that it adds height if you plan on trailering your boat.
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Old 09-08-2015, 01:51 PM   #8
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It is a full long cabin northwest style pilothouse.. So no issues there.. And the boat stays in the water, if needed, the radar tower folds down.
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Old 09-08-2015, 02:15 PM   #9
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Had a 6' on a 36 Grady White express which is a HUGE boat and it looked like a freaking helicopter. I would defiantly go with a 4'
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Old 09-08-2015, 05:00 PM   #10
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It's not about looks.
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Old 09-08-2015, 05:32 PM   #11
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If it's an open array, be it 4' or 6', the weights will be very similar. The range of both units is "72 miles". The effective range (much less) has less to do with antenna width but height (which will be the same in your application). The width determines target differentiation at a distance. Depending on your targets and the distance needed, this might come into play for your application.

I'm going with a 4' 12 KW open array for birds. At 6+ KW (preferably 10 or 12KW), the limiting factor distinguishing soft targets at a distance is line of site (height of antenna and targets). I don't consider the modest increase in the center of gravity putting the antenna 10-13 ft high as much of a consideration. The distance you'll be able to acquire soft targets will be 6+/- miles regardless of strength, instead dependent on height.

That being said, if your application is seeing hard targets (boats/markers/land) or rain, I'd go with a dome radar as they're lighter/lower profile/cheaper. Unless you need target differentiation at a distance, the less expensive units will provide hard target acquisition just like the expensive open arrays less than 4 miles (rain much much further).
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