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Keith Dysart wrote:
I suppose this non-sequitor means that you agree that an ideal section of transmission line, just like an ideal inductor and capacitor, will store energy forever if provided with the appropriate initial conditions, but do not wish to admit it. I freely admit that it can happen in your mind (like leaping tall buildings at a single bound). I do not believe it can happen in a real-world situation. But if you can demonstrate lossless transmission lines and lossless inductors on the bench, be my guest and probably win a Nobel Prize in the process. An intriguing thought experiment is to take several of these sections with stored energy (with the proper phase relationship) and connect them together. Do the reflections present at the ends of the short sections suddenly disappear when the sections are connected to form a longer line? Are the reflections now only occurring at the ends of the longer section? Reflections are impossible except at physical impedance discontinuities. There are zero reflections at a point in a smooth fixed Z0 section of transmission line. Cut the line and you get 100% reflection. That's why your assertions of "no change" don't make sense. You would have us believe that short circuit to open circuit is "no change"??? If that is true, there's "no change" between a shorted 1/4WL stub and an open 1/4WL stub. -- 73, Cecil http://www.w5dxp.com |
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