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#11
June 15th 10, 07:36 PM
posted to rec.radio.amateur.antenna
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Where does it go? (mismatched power)
Owen Duffy wrote:
lu6etj wrote in news:da3e5147-cad8-47f9-9784- : ... OK. Thank you very much. This clarify so much the issue to me. Please, another question: On the same system-example, who does not agree with the notion that the reflected power is never dissipated in Thevenin Rs? (I am referring to habitual posters in these threads, of course) Thevenin's theorem says nothing of what happens inside the source (eg dissipation), or how the source may be implemented. . . . Cecil has used this fact as a convenient way of avoiding confrontation with the illustrations given in my "food for thought" essays. However, those models aren't claimed to be Thevenin equivalents of anything. They are just simple models consisting of an ideal source and a perfect resistance, as used in may circuit analysis textbooks to illustrate basic electrical circuit operation. The dissipation in the resistance is clearly not related to "reflected power", and the reflected power "theories" being promoted here fail to explain the relationship between the dissipation in the resistor and "reflected power". I contend that if an analytical method fails to correctly predict the dissipation in such a simple case, it can't be trusted to predict the dissipation in other cases, and has underlying logical flaws. For all the fluff about photons, optics, non-dissipative sources, and the like, I have yet to see an equation that relates the dissipation in the resistance in one of those painfully simple circuits to the "reflected power" in the transmission line it's connected to. Roy Lewallen, W7EL |
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