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| To: | <[email protected]> |
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| Subject: | LF: Re: Modelling aerials |
| From: | "James Moritz" <[email protected]> |
| Date: | Tue, 26 May 2009 21:22:03 +0100 |
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Dear Richard, LF Group, I am trying to model various aerial configurations for 500kHz using NEC. I have set the antenna 0.5m above ground as NEC2 does not like radials on the ground. I have used "real ground". Has anyone compared the calculated Source impedances to real-world measurements at 500kHz? The conclusion I came to was that the elevated radials do not model the ground system very realistically. Also, the real antenna resistance can vary a lot with differnet kinds of environment. The disclaimer might go "any resemblance to real figures is purely coincidental"! NEC is a good way of working out the antenna capacitance and radiation resistance, though, using lossless wires and "perfect" ground. Cheers, Jim Moritz73 de M0BMU |
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