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## Re: [TowerTalk] Radial length

 To: "Towertalk" Re: [TowerTalk] Radial length "Jim Brown" Sun, 16 Mar 2008 09:12:21 -0800 mailto:towertalk@contesting.com>
 ```Certainly a circularly symmetrical radial system is best, but few of us are able to realize it. Mine deviates significantly from that ideal, but the antenna works well. The best and most readable description I've seen for the function of a radial system is by W2DU, as a chapter of his book "Reflections." It's on his website. Google on w2du to find it. N6LF has written a rather detailed version that's in the Antenna Book, but there are typos in the associated graphics that make it difficult to follow. The short answer is that the radial system functions as a return for the currents and the fields associated with the antenna. The lower the resistance of whatever conductors serve this function (including the earth), the closer the antenna comes to full theoretical efficiency. The radial system does NOT function as a reflector for the signal. The earth at significantly greater distance from the antenna serves that function. I have seen many references in the literature to the effect that NEC is not very good at modeling ground losses and the effect of radial systems. Count me among those who 1) consider real measurement of one radial system compared to a reference antenna as the only meaningful predictor; 2) consider soil conditions at any given location to be an influence on how many radials it takes to get there; and 3) consider Tom's advice, and the advice in the Antenna Book to be solid as a rock. 73, Jim Brown K9YC On Sat, 15 Mar 2008 14:23:26 -0400, Robert Carroll wrote: >On the other hand if I were >only trying to provide a low loss ground return, I might route the radials >for convenience in avoid things like a garden, a pool, or some other object. >Which view is the correct one? _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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