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I’m a radar novice. Does a radome need to go on the main mast, can it go on
the missen, or does it matter? Jim Ashworth
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Jim,
It can go on either mast. On the main mast you will need some sort of
protection to keep it from being snagged by the head sail. On the mizzen
you will get a slight shadow from the main mast. You can mount the antenna
higher on the main mast, which may provide greater range. It may also
produce more motion on the array, which may affect target tracking.No real right or wrong choice. My antenna is mounted on the mizzen, just
below the spreaders.Regards,
John Stevenson
http://www.svsarah.comOn Fri, Mar 30, 2012 at 1:35 PM, Jim Ashworth wrote:
I’m a radar novice. Does a radome need to go on the main mast, can it go on
the missen, or does it matter? Jim Ashworth
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maillist mailing listhttps://pearson424.org/mailman/listinfo/maillist_pearson424.org
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Mine is on the mizzen
Rick Dugger
EclipseOn Fri, Mar 30, 2012 at 1:35 PM, Jim Ashworth wrote:
I’m a radar novice. Does a radome need to go on the main mast, can it go on
the missen, or does it matter? Jim Ashworth
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maillist mailing listhttps://pearson424.org/mailman/listinfo/maillist_pearson424.org
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Mine is on the main mast just above the spreaders. I don’t personally think long range is important so getting it up high shouldn’t be a priority. I usually use shorter ranges. Most collisions occur within less than a half mile 😉
Rich
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Rich, you only have a main mast if I remember correctly…
I’m not being terse. This is from my mobile.
On Mar 30, 2012 11:50 PM, wrote:Quote:Mine is on the main mast just above the spreaders. I don’t personally
think long range is important so getting it up high shouldn’t be a
priority. I usually use shorter ranges. Most collisions occur within less
than a half mile 😉Rich
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Mine is on the main mast above the spreaders… No Mizzen mast on Running Tab. If you do mount it on the main mast there’s a protective bar to keep the jib from catching on it…
Bill’s 2 centsSent from my iPhone
On Mar 31, 2012, at 3:11 AM, Robert Fine wrote:
Quote:Rich, you only have a main mast if I remember correctly…I’m not being terse. This is from my mobile.
On Mar 30, 2012 11:50 PM, wrote:Quote:Mine is on the main mast just above the spreaders. I don’t personally
think long range is important so getting it up high shouldn’t be a
priority. I usually use shorter ranges. Most collisions occur within less
than a half mile 😉Rich
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Jim,
As has been said, there is no right or wrong choice. I chose to mount my
radome on the mainmast for several reasons:– The higher the radome, the greater the effective range. That is, a
radar mounted higher will see low land sooner than the same radar
mounted lower.– There is sometimes a gap in a mizzen-mounted radar’s view forward,
caused by the mainmast blocking it.– I put a wind generator on my mizzen mast. Mounting the radar up there
in addition would’ve been too much.– Mounted a little above the spreaders on the mainmast, the radome does
not interfere with the headsails. They never touch it; can’t reach it.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Yes, my comment about height would be applicable even if I had a mizzen. You want it high enough so you don’t radiate crew on the deck but I see no point in getting it up much higher. 15 feet or more should do. When I first bought a RADAR unit many years ago, I thought that a unit with longer range would be desirable. After getting more experience I find that its more important to have a unit that works well at close range. I usually switch among the closest range settings and rarely use the 3-mile or longer ranges. I might use the longer ranges for navigation or weather observation. At close range in calm seas I can see seagulls and lobsta floats out to about 1/8 mile.
If I had a ketch, I’d probably put it on the mizzen. I might be concerned about interference with targets directly ahead. Its most important that the unit work well directly ahead since that’s where you’re going. I’ve no experience with how much interference the main mast might cause in a ketch mounting configuration however. I can say that the mast behind where the radome is mounted causes a shadow. I get reduced sensitivity directly aft caused by interference from the main mast.
Last year we had a rendezvous at Point Judith. It was pea-soup fog headed to and again returning from the event. On the way in I could barely see the bow from the helm. Point Judith is difficult to navigate in poor visibility. The channel is narrow and winding. On the way in I saw a large echo on the RADAR display. It was clearly a very large vessel headed toward me. When you get a large target, it paints across the screen making it impossible to determine target heading. I nudged over to the extreme right side of the channel per my chartplotter and slowed down to headway speed, sounding my horn as required. Out of the fog came the bow of the Block Island Ferry no more than two boat-lengths ahead. This is a big steel boat. His bow must have been almost even with the top of my mast. I wonder if he ever saw me. It scared the pants off me. I made a sharp turn to starboard and barely avoided a collision. I think the ferry was on the wrong side of the channel but who’s to argue? No, a vessel over 20m in a channel doesn’t have to right-of-way over a sailing or power driven vessel under 20m. We are required to not impede the larger vessel but this doesn’t give them right-of-way. He’s supposed to stay on his side of the channel. I don’t think I would have even attempted to enter the harbor if I hadn’t had RADAR but its not a perfect solution.
Regards
Rich
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Rich,
I can see how the closer ranges matter most to you, especially in fog,
since you’re mostly making coastal passages. For offshore cruising,
however, the long ranges also matter. It’s necessary to know what ships
are within 5-8 miles of you and how they’re moving, and helpful to track
vessels 16 miles away, especially for a single-hander going below for a
nap. Also, as mentioned, a radar mounted higher will “see” low land and
other low targets sooner. Of course, with GPS today we usually know
exactly where we are and exactly where the land masses are in relation
to us. Still, early visual confirmation of distant objects can be
useful.Just another perspective,
Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Don’t most collisions happen within the length of the objects colliding?….
Eric Lorentzon
EFI Sales Development Manager
412.352.1941
Sent from my iPhoneOn Mar 30, 2012, at 11:49 PM, wrote:
Quote:Mine is on the main mast just above the spreaders. I don’t personally think long range is important so getting it up high shouldn’t be a priority. I usually use shorter ranges. Most collisions occur within less than a half mile 😉Rich
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