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Gene Fuller wrote:
Yes, most people with rudimentary arithmetic skills would agree that 75 plus 8.33 does not equal 133.33. Too bad Dr. Best posted the equation: "Ptotal = 75w + 8.33w = 133.33w" on this newsgroup (and, thank goodness, left it out of his article) so he obviously disagreed with you at the time. He also said that interference had nothing to do with it. However, anyone even remotely familiar with waves would readily understand that the component waves Cecil loves to talk about are merely mathematical conveniences. It is entire possible to set up other model configurations, such as a combination of a one traveling wave and one standing wave. What happens at an impedance discontinuity given those circumstances? To find out, read my WorldRadio article, Part I of which is posted on my web page. Part II will be posted after Christmas. At the risk of raising your politically incorrect ire as I have done with this technical posting, MERRY CHRISTMAS!. In order to make his model work, Cecil needs to invoke the mythical P3 and P4 on the source side of the reflection discontinuity. He never gets around to explaining how these two waves, which exactly cancel at all points in space and at all times, can contain any energy at all. The answer is simple. Do waves contain any energy at all? Do waves that cancel contain any energy? If waves contain no energy, they cannot exist, and therefore are incapable of canceling. If they exist and cancel, they contained energy just before their cancellation. Any way you cut it, my approach is consistent with the laws of physics as enumerated in "Optics", by Hecht, and yours leads to a contradiction of those laws of physics. The reason that most practitioners of wave models solve for the fields first and then worry about power or energy is: a - This procedure works correctly all the time. Yes, it does. But optics engineers didn't have the luxury of dealing with voltages and currents. They had to solve the problem using powers. And they did exactly that decades ago. That RF engineers refuse to consider the laws of physics concerning EM waves developed by optics engineers is absolutely astounding to me. W7EL put it best, something to the effect that if it wasn't invented here, we don't want to hear it (even if it is right). But I daresay that Eugene Hecht knows much more about EM waves that you will ever know, given your closed mind. I do not expect to change Cecil's mind. Other than his own potential embarrassment from the silly publications in World Radio, his folly is harmless. You are just displaying your extreme ignorance, Gene. My "WorldRadio" article corrects some of the *conceptual* errors in Dr. Best's QEX article but otherwise contains the same equations as his article. If you disagree with me, you are also disagreeing with Dr. Best's equations, i.e. you are between a rock and a hard place. It is interesting that the very people who tell us not to worry about energy are the people who get so emotionally rabid when someone chooses to worry about energy like real-world physicists do. What do they possibly have to lose besides face, self-esteem, sleep, and their pseudo-religious guru status? :-) -- 73, Cecil http://www.qsl.net/w5dxp |
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