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rock knocker
Joined: 29 Sep 2016 Posts: 61 City/Region: Georgetown
State or Province: CA
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Posted: Sun Nov 18, 2018 9:32 pm Post subject: Raymarine radar extension is a bit tall |
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I just purchased a 22ft cruiser yesterday and it came with a raymarine radar on a mount that is about 2 feet tall. My question is can i mount it right to the roof or is it that high for a reason? Thanks in advance. |
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ssobol
Joined: 27 Oct 2012 Posts: 3374 City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
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Posted: Mon Nov 19, 2018 1:31 am Post subject: |
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In theory higher is better for range. But it depends on what you want to use the radar for. If it is for avoiding things you might hit (i.e. stuff up close) than lower is fine. If you are looking to use it for fishing (e.g. finding birds) then higher might be better. For a given beam angle, higher also causes the minimum usable range to increase because you can't see things below the beam. In either case, a two foot difference in height is not going to make any real difference to the radar performance on your boat. You just want the radar up high enough to avoid beam obstructions on the top of your boat. |
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colbysmith
Joined: 02 Oct 2011 Posts: 4551 City/Region: Madison
State or Province: WI
C-Dory Year: 2009
C-Dory Model: 25 Cruiser
Vessel Name: C-Traveler
Photos: C-Traveler and Midnight-Flyer
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Posted: Mon Nov 19, 2018 11:10 am Post subject: |
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Mine is on my roof and works fine. |
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starcrafttom
Joined: 07 Nov 2003 Posts: 7882 City/Region: marysville
State or Province: WA
C-Dory Year: 1984
C-Dory Model: 27 Cruiser
Vessel Name: to be decided later
Photos: Susan E
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Posted: Mon Nov 19, 2018 3:11 pm Post subject: |
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Its just not for the benefit of the radar. It for the benefit of more storage space on the roof, for say a dinghy or kayak. We talking about a arch right? If its just a single point stand then I do not see a real benefit to it. That extra foot is not buying you much distance. I find, for my area , that anything past 5 miles to be over kill. _________________ Thomas J Elliott
http://tomsfishinggear.blogspot.com/ |
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thataway
Joined: 02 Nov 2003 Posts: 20814 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Mon Nov 19, 2018 4:05 pm Post subject: |
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I have mounted radar to the roof. It is possible. Agree that you will not get appreciable increase of range with 2 feet.
But Radar beam is 20 to 30* in vertical bandwidth. You should have a little wedge under the radome to give down forward of 3 to 5* to allow for running angle when on a plane. Also right on the roof--you do loose some of that beam--into the glass--and perhaps a little into the cabin. A little safer above --2 feet is a pretty normal strut. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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colbysmith
Joined: 02 Oct 2011 Posts: 4551 City/Region: Madison
State or Province: WI
C-Dory Year: 2009
C-Dory Model: 25 Cruiser
Vessel Name: C-Traveler
Photos: C-Traveler and Midnight-Flyer
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Posted: Mon Nov 19, 2018 8:17 pm Post subject: |
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I do have spacers under the back of my radar, to make it set more level when on plane. That means at hull speeds it's aimed down a bit more. Which is fine, as at slower speeds I don't need to see as far out. Using it in day visual conditions, I'm very satisfied with what it picks up. (Pretty much everything it would pick up if it were higher. At least within the 5-6 miles that matter.) Which gives me more trust in it at night or low visibility situations. Colby |
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journey on
Joined: 03 Mar 2005 Posts: 3595 City/Region: Valley Centre
State or Province: CA
C-Dory Year: 2005
C-Dory Model: 25 Cruiser
Vessel Name: journey on
Photos: Journey On
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Posted: Mon Nov 19, 2018 11:12 pm Post subject: |
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And there are those of us who want it high and at the front of the cabin so that the radiation pulse doesn't hit us humans. 4 Kw is a lot of power, greater than a microwave, but at a longer distance.
Journey On started out with a 4 Kw radar and so the radar arch is forward and high enough that the emitted power doesn't pass through me.. Now has a low power Lowrance, which doesn't have a microwave effect.
Boris |
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rock knocker
Joined: 29 Sep 2016 Posts: 61 City/Region: Georgetown
State or Province: CA
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Posted: Mon Nov 19, 2018 11:35 pm Post subject: |
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Thank you i will probably just leave it the way it is for now. |
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starcrafttom
Joined: 07 Nov 2003 Posts: 7882 City/Region: marysville
State or Province: WA
C-Dory Year: 1984
C-Dory Model: 27 Cruiser
Vessel Name: to be decided later
Photos: Susan E
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Posted: Tue Nov 20, 2018 1:54 pm Post subject: |
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Rock knocker- i see you are in george town. WIfe and I went to el dorado in 84 and 87. |
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rock knocker
Joined: 29 Sep 2016 Posts: 61 City/Region: Georgetown
State or Province: CA
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Posted: Wed Nov 21, 2018 11:55 pm Post subject: |
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I love Georgetown... been in the area for 40 years. Beautiful country! |
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