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## RE: [TowerTalk] Ground radials/elevated radials

 To: "'Tom Rauch'" , RE: [TowerTalk] Ground radials/elevated radials "W7TMT" Fri, 22 Oct 2004 22:07:25 -0700
 ```Tom, 1) In your opinion where is the cutoff between "elevated radials" and a "ground plane" system. How high off the ground does the system need to be before it becomes a GP rather than an "elevated radial" system? and 2) How does the efficiency of 50-60 on-the-ground radials compare to a reasonable number of radials (insert your number of radials required here) that are installed under the feedpoint of a vertical when the feedpoint is let's say a 1/4 wave off the ground. W4RNL has some pretty interesting models on his site (http://www.cebik.com/gp.html) showing rather impressive low angle radiation patterns for the elevated GP but that article doesn't address the efficiency issue you're addressing in this thread when the "elevated radials" are relatively close to the earth. Further, if it was practical to install a vertical either on the ground with an excellent radial system as you've described or elevated a 1/4 wave with the appropriate number of redials which would you choose? 73 Patrick W7TMT -----Original Message----- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Tom Rauch Sent: Friday, October 22, 2004 21:15 PM To: Paul Playford; 'Yo3ctk'; towertalk@contesting.com Subject: Re: [TowerTalk] Ground radials/elevated radials Big snip... Let's just not imply the efficiency of four radials 1/25th of a wavelength above ground is near 90%, like it is with 25-50 wires laying on or in the dirt. Another big snip... 73 Tom _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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