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Ground conductivity's effect on vertical
Hi, Everybody,
In the process of modeling a vertical antenna (specifically, I am using EZNEC 5.0) I am noticing an effect I did not expect which could be the result of a modeling error on my part. The antenna is a 34-foot vertical above (12) 34-foot radials, making it a 1/4 wave on 40 and a 1/2 wave on 20. On 40, the antenna works as I expected; as the ground conductivity goes up, the gain and efficiency of the antenna both increase, too. But on 20, if I increase the ground conductivity from, say, 0.005 to 0.008 S/m, the max gain and efficiency *decrease*! This is counter-intuitive to me. Can anyone point to something I'm doing wrong? Thanks, Al W6LX |
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