Radome Mast Mounts: Should They Pivot? - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 20 Old 01-09-2008
Larus Marinus
 
Idiens's Avatar
 
Join Date: Jan 2007
Location: Brussels
Posts: 1,756
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Quote:
Originally Posted by Valiente View Post
... Perhaps I should just go for a 2 KW higher up (I fly a yankee, so it's not likely to snag), so I can have a decent range and a little bit of a power savings.
Nothing against more power, but there is a limit to its usefulness, as the radar is limited to its horizon and by the height of the target beyond that. So a bouy will vanish over the radar's horizon quite quickly - more power will not help. A ship will be seen at greater range, but it's a bigger reflector - which ensures that more power is not needed.

Jonathan-Livingston
Idiens is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 20 Old 01-09-2008 Thread Starter
Senior Member
 
Valiente's Avatar
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
   
Yes, I am coming to realize that learning to read a properly placed 2 KW is probably better than installing a 4 KW on an arch.

The simple fact is that a 2 KW will more than suffice for seeing reefs and other low stationary objects at relatively short distances (under 6 miles), and AIS will help identify moving ships within VHF range. So the "prudent set-up" for the ocean sailor goes from a 4 KW on the mast or arch to a 2 KW on the mast, with an AIS whip on the mast top. Add to that a radar interpretation course, and I believe I'm covered.

4 KW won't tell me much more unless its high enough to significantly see over the horizon, and past the waves.

Somebody correct me if I'm wrong here.
Valiente is offline  
Quote Quick Reply Share with Facebook
post #13 of 20 Old 01-09-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
The only major difference is that many of the 4kw units have a narrower beam focus, so will give you higher definition in your radar imaging. These usually have a 24" radome though, so may not be something you're interested in. The 2 kW units have an 18" radome generally.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #14 of 20 Old 01-09-2008 Thread Starter
Senior Member
 
Valiente's Avatar
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
   
The radome size doesn't bother me...the power draw does.

I think my general approach is that I should know my position, and thus don't need so much to be able to "count the pores" as to just have an either/or picture of an outline ahead in the water.

As I stated elsewhere, I hope AIS capability (and the habit of keeping a decent watch) will enhance a 2 KW RADAR to the degree where it's like having a 4 KW, if only because you want to know if you're a mile off the reef, but you want to know if you're ten miles from the supertanker moving at 25 knots. AIS/VHF with an antenna height of 50 feet should give you the latter, and a 2KW RADAR 20 feet off the deck should give you the former.
Valiente is offline  
Quote Quick Reply Share with Facebook
post #15 of 20 Old 01-09-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
just remember...radar can be used for range to an object fairly reliable, but not for bearing to an object.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #16 of 20 Old 01-09-2008
Senior Member
 
artbyjody's Avatar
 
Join Date: Jan 2008
Location: Bellingham, PNW
Posts: 3,146
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 11
       
Depending on how you configure the Radar to update via your C/E-series display, I know on my 2KW system, I can easily drain a 31D 12V battery within 6 hours, if using the 1 or 3 minute update cycle. It is a power hog. Typically I run it only when in a crowded harbor, or visibility is poor, or when I had a functioning inboard - motoring. If you plan on relying on it more heavily during sailing - you may want to consider upgrading your battery banks so that you can handle more amp hours.

-- Jody

S/V "
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
" -
1983, Barberis Show 38! or
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.







artbyjody is offline  
Quote Quick Reply Share with Facebook
post #17 of 20 Old 01-10-2008 Thread Starter
Senior Member
 
Valiente's Avatar
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
   
Will four 8D AGMs do? (about 800 amp/hours).

But thanks for the advice. I don't plan on using it super extensively, but I would have in in "guard" mode on night watches, as I would the AIS. If I were to have it fully on, I would likely be motoring, as you said, in a harbour or a crowded channel. In the English Channel, for instance, I would likely motorsail with the tide (and with the radar on) due to the large number of fast ferries and the large variety of indifferently manned cargo ships.
Valiente is offline  
Quote Quick Reply Share with Facebook
post #18 of 20 Old 01-10-2008
Senior Member
 
artbyjody's Avatar
 
Join Date: Jan 2008
Location: Bellingham, PNW
Posts: 3,146
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 11
       
That will be pretty adequate I would think, especially if motor sailing...

-- Jody

S/V "
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
" -
1983, Barberis Show 38! or
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.







artbyjody is offline  
Quote Quick Reply Share with Facebook
post #19 of 20 Old 01-10-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
But Valiente, Ken Barnes had 14 of them aboard his boat, so I think you really need to have at least seven or eight of them.
Quote:
Originally Posted by Valiente View Post
Will four 8D AGMs do? (about 800 amp/hours).

But thanks for the advice. I don't plan on using it super extensively, but I would have in in "guard" mode on night watches, as I would the AIS. If I were to have it fully on, I would likely be motoring, as you said, in a harbour or a crowded channel. In the English Channel, for instance, I would likely motorsail with the tide (and with the radar on) due to the large number of fast ferries and the large variety of indifferently manned cargo ships.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #20 of 20 Old 01-10-2008 Thread Starter
Senior Member
 
Valiente's Avatar
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
   
To keep the boat level! Why didn't I think of that? (slaps head)
Valiente is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Deck stepped Mast-Always Bad ? Mrs Mutiny Boat Review and Purchase Forum 24 10-05-2009 07:55 PM
Southern Cross 31? db27513 Boat Review and Purchase Forum 35 09-24-2007 10:58 PM
what mast? jrwright Boat Review and Purchase Forum 3 03-14-2004 08:19 PM
Is one better than the other? gandydancer Gear & Maintenance 7 07-11-2002 06:08 PM
Installing Radar Sue & Larry Gear and Maintenance Articles 0 02-22-2002 07:00 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome