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Tom Donaly wrote:
Hecht forgot to put the phase difference in his formula. It's no wonder there's no phase information in your standing waves, Cecil, Hecht left it out. You are mistaken. If Hecht left it out then so did Gene Fuller. I suggest you listen to Gene when he says: Regarding the cos(kz)*cos(wt) terms in the standing wave equation: Gene Fuller, W4SZ wrote: In a standing wave antenna problem, such as the one you describe, there is no remaining phase information. Any specific phase characteristics of the traveling waves died out when the startup transients died out. Phase is gone. Kaput. Vanished. Cannot be recovered. Never to be seen again. The only "phase" remaining is the cos (kz) term, which is really an amplitude description, not a phase. Not only that, but where did he get the idea that it was sin(kx) instead of cos(kx). I understand Hecht is a good old boy, but I'd like to see his derivations. Apparently, you are ignorant of the difference in conventions between optics and RF engineering. In optics, there is no current so there is no current changing phase at an open circuit. In optics, the M-field changes directions but not phase. In RF engineering, a change in direction of the H-field is considered to be a 180 degree phase shift. Both conventions are correct as long as one understands them. Your strange statement about Hecht above just proves your ignorance. -- 73, Cecil http://www.qsl.net/w5dxp |
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