Joe, the article I referenced clearly said to use 1/4 wavelength radials when they are elevated. That's agrees with everything I've read and done over years as well.
I'll stand behind that SteppIR article as showing how to put up a vertical that avoids the worst pitfalls. (And it's basically a repeat of what's in every Antenna Handbook I've read over the years.) Can one tweak it even further? Perhaps. The articles you reference study some ideal situations that most Hams cannot emulate that do so, especially in producing a perfectly omnidirectional pattern with a minimum of 4 radials. And they confirm the basic rules covered in the SteppIR article. 73, Ron AC7AC -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV Sent: Saturday, May 18, 2013 11:53 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] OT: Elevated vs. Buried Radials The SteppIR information is overly simplified. For the best current analysis of elevated vs. on ground radials see the extensive data from N6LF - http://www.antennasbyn6lf.com In particular, read the comments on elevated radials: http://www.antennasbyn6lf.com/2011/02/comments-on-elevated-radials.html studies on ground systems: <http://www.antennasbyn6lf.com/2009/12/series-of-qex-articles-on-ground-syst em-experiments.html> and studies on elevated radial systems: <http://www.antennasbyn6lf.com/2012/02/elevated-radial-ground-systems-some-c autions.html> One of the major red flags with elevated radials - they must be a major fraction of a wavelength (1/8 wave is a good rule of thumb) before they really act independently of the "dirt". Even then, nothing will reduce the losses in the 1 to 10 wavelength area responsible for forming the low take off angle lobe. 73, ... Joe, W4TV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
