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Current across the antenna loading coil - from scratch
Gene Fuller wrote:
In simplified form, when superposition applies it says that the output from the combination of two inputs is the same as the sum of the outputs from each input taken one at a time. The point is that phase is not preserved through the superposition process and as you have noted before, the phase information completely disappears from the superposed standing wave current. This is precisely what allows all of the various authors to say that one can consider a standing wave to be equivalent to two opposite direction traveling waves. This is purely a mathematical notion; superposition does not impact the physical reality at all. It certainly impacts the physical reality of W7EL's phase measurements. If he measured the delay through the coil using the forward current, he would obtain valid results. If he measured the delay through the coil using the reflected current, he would obtain valid results. But the superposition of those two currents results in a signal with unchanging phase that cannot validly be used to determine the delay through a wire or a coil or anything else. I thought you were quoting me as one of your gurus when it was convenient. Yes, because you agree with me on most technical points. Your arguments with me are invariably personal, not technical. I am not aware of a single technical point upon which you and I disagree. -- 73, Cecil http://www.qsl.net/w5dxp |
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