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1. [TowerTalk] Ground Plane Model Problem (score: 1): Author: "K0SN" <k0sn@czo.net>; Date: Tue, 18 Nov 2008 21:44:18 -0600; Gentlemen: I have been modeling a ground plane vertical antenna with elevated radials. It's made of 3" aluminum tubing at a base height of about 15 feet. My problem is EZNEC is reporting the feedpoin; /archives//html/Towertalk/2008-11/msg00471.html (6,843 bytes)
2. Re: [TowerTalk] Ground Plane Model Problem (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 19 Nov 2008 05:50:16 -0800; What does it give if you run the model in free space? Are the radials drooped, or at right angles? I think that the GP vertical is one of the examples that comes with NEC. ___________________________; /archives//html/Towertalk/2008-11/msg00475.html (7,545 bytes)
3. Re: [TowerTalk] Ground Plane Model Problem (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 19 Nov 2008 14:34:38 +0000; Tom, A quarter-wave vertical over a perfect ground would be about 35 Ohms, not 50-75 Ohms. But 10 Ohms still looks odd. Can you post a copy of the EZNEC file somewhere so that we can take a look? 73,; /archives//html/Towertalk/2008-11/msg00476.html (8,344 bytes)
4. Re: [TowerTalk] Ground Plane Model Problem (score: 1): Author: w3kl@w3kl.com; Date: Wed, 19 Nov 2008 08:15:32 -0800 (PST); Tom. I've modeled a 1/4 wave gp with one resonant radial (1/4 wavelength) using the dimension you provided using NEC4 and it yields an impedance (real part, at resonance) of 40 ohms. BTW, you didn't; /archives//html/Towertalk/2008-11/msg00481.html (9,057 bytes)
5. Re: [TowerTalk] Ground Plane Model Problem (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 19 Nov 2008 16:34:43 +0000; Tom, Certainly a major flaw with your existing model is the segmentation. In some instances you had adjacent segments with a 30:1 ratio of length. You also need shorter segment lengths than you have; /archives//html/Towertalk/2008-11/msg00484.html (7,356 bytes)

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