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Roy Lewallen wrote:
The stub produces just as much horizontally polarized radiation as the wire. Not true. The wire produces 2 dB more radiation than the stub. Given that the stub is located in a high current region compared to the wire, it is significant how much the stub doesn't radiate. If you replace the stub with an equal length of single wire, it radiates 4 dB more than the stub. Run your stub vertical model with an elevation plot, and azimuth angle of 90 degrees. Click FF Tab. Note the magnitude of the horizontal component -- roughly -30 dBi. Then repeat with the experimental model with the single horizontal wire. Thanks, Roy, that's an angle I had not looked at. Results are above. As I mentioned in my lengthy posting, the radiation from the stub isn't a large part of the overall field, and this certainly shows it. But it's certainly enough to disturb the vertical's current. Exactly the same thing holds for the straight wire. Common mode current is common mode current. No magic, no mysterious phenomena "not accounted for" by EZNEC. What EZNEC doesn't account for is the phase delay through a bugcatcher coil which is an appreciable percentage of a wavelength. EZNEC is incapable of modeling a bugcatcher coil. The only coil that EZNEC is capable of modeling is one that does not and cannot exist in reality. Therefo One cannot use EZNEC to try to prove the current is the same at both ends of a bugcatcher coil which is what kicked off this entire discussion. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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