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Question about "Another look at reflections" article.
On 25/05/2010 18:45, lu6etj wrote:
.... To Owen: Sincerely thanks for your reasons. You can be sure I will take note about your explanation an take some time tu analize it, but I am not sure about to arrive at at the right conclusion because what I read in this newsgroup is a long-standing discussion here. Yes, it is a recurrent discussion item. No doubt someone will be along shortly to add some confusion to the pot. A parting thought, do not confuse the process of establishment of steady state with steady state. The only reason that a steady state solution is valid, is that the system spends most of its time in steady state, or substantially so. If the solution needs to focus mainly on establishment of steady state (in other words, the system never substantially settles), then you should be doing a time domain solution, and VSWR, reactance, complex impedance are not a time domain concepts. If you need to convince yourself, do a hand workup of five of ten transits with a sinusoidal excitation. See that is does converge, and quickly, and that at the load end, the reflected wave relative to the forward wave is a fixed ratio (and hence VSWR) that depends ONLY on Zo and Zl, there is NO influence by the source or any perceived source reflection on the steady state. There are some animations of this on the net, but they seem to confuse people more than enlighten them. Owen |
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