JRC Radar - safe usage and opinions - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #11  
Old 05-06-2011
Hands-on Tech
 
Join Date: Nov 2009
Location: Illinois
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
handson is on a distinguished road
Radar

"I've never used radar before, here in the Great Lakes, it's not that necessary "

I would argue that point. Here on the great lakes we have a lot of freighter traffic and other big boats like car ferries. Radar is useful. If you have it, learn how to use it and make the best of it.
Radar coupled with AIS is VERY useful on the lakes.

Now, as far as safety; People should generally not be within the radiation pattern of any transmitter. It's just good practice to stay clear. Even though the manufacturer states a 30 degree pattern, there are "lobes" of radiated energy outside of that normal pattern, but usually at an order of magnitude less power, so from an exposure perspective they are good to avoid, but I would not get too crazy about it.
If it is foggy and I am on the water, I will opt for the radar over worrying about the radiation risk. It probably is less exposure that you get every day in a city because of all the (hundreds or thousands) of sources in our every day life. If it is someday proven harmful, your greatest cumulative exposure is not going to be from your vessels radar.

The fact is, that freighter you did not see in time to get out of her way will very likely kill you very quickly. The radar energy.. well, it's not even proven to be harmful at normal levels.
I do however take issue with the comparrisson to a "Small Microwave". While that is technically correct, that definitely should not be a safety endorsement. Getting in front of that emmitter beam directly would be excruciatingly painful in a few seconds.

Use your radar, it's worth it. But as a fellow boater, even though I am not afraid of it, I would prefer you did not operate it at the dock or in ancorage where I am .

HandsOn
Reply With Quote Share with Facebook
  #12  
Old 05-06-2011
Senior Member
 
Join Date: Nov 2009
Location: Vancouver BC
Posts: 199
Thanks: 0
Thanked 4 Times in 3 Posts
Rep Power: 5
delite is on a distinguished road
I believe Canadian regulations require you to use your radar if you are equipped with one that is operational but perhaps someone can correct me. No need when at dock or anchored.
Reply With Quote Share with Facebook
  #13  
Old 05-06-2011
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,560
Thanks: 2
Thanked 83 Times in 81 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
"The manual claims a 'vertical beam width' of '30', which I take to mean 30 degrees and I must assume that's 30degrees down from the horizontal,"
Not quite. A beamwidth of 30 (degrees) would be 15d above and 15d below the horizontal, a total of 30 degrees width. So you only have to measure down 15 degrees from the antenna, not 30.
Reply With Quote Share with Facebook
  #14  
Old 05-06-2011
JordanH's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Canada
Posts: 324
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
JordanH is on a distinguished road
I considered the 15down/15up scenario and figured it'd be more conservative to calculate the 30 degrees down instead. I figured they might have angled the antenna so the axis was not horizontal. At any rate, at 15 degrees down, the safe range is even better.

handson, I won't argue with you about the necessity of it on the great lakes. You make some good points about using it here in higher traffic areas.
I am comfortable with limited radiation exposure; in general, I feel that we are exposed to all sorts of RF radiation in our daily lives without ill effect. Radio stations, cell phones, and all manner of other things so I will sleep comfortably at night with use of the radar.

As for taking exception to the "small microwave" comment, well, that was a direct quote from the response by JRC. I won't try to support or defend the comment but I will remind you of the inverse-square law and that this radar has a documented peak output of 1.5kW and regular output of around 1,000W which isn't that powerful in the grand scheme of things. That power is quickly dispersed over a short distance and we likely absorb more radiation than that walking around on the streets.

delite, I'm not aware of any Canadian regulation for using the device, particularly on a voluntarily equipped vessel. However, I wonder if the collision regulations might come into play... having a collision in the fog with your radar turned off may imply that you did not take all necessary actions to avoid that collision.

Thank you all for replying with thoughtful and considered opinions.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Turnbuckle usage brucedtyler Gear & Maintenance 3 02-27-2011 03:47 PM
measure amp usage QuickMick Electrical Systems 17 03-31-2010 08:24 AM
Deck House Mount Radar Scanner ! Safe? mikeysoutheast Sailnet.com Polls 2 10-03-2008 08:18 AM
Traveler usage? Humpwalker Seamanship & Navigation 22 02-17-2007 10:54 AM
autopilot amp usage Brezzin Gear & Maintenance 4 01-02-2007 02:47 PM


All times are GMT -4. The time now is 10:30 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.