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Jim Kelley wrote:
Cecil Moore wrote: I think it depends on how long the energy has been flowing. But in the steady state it's rather like posing this question: With a forward speed of 200 knots, and with a headwind speed 100 knots, would you agree that the apparent airspeed of the aircraft is 300 knots? Of course, I was talking about steady-state conditions. And I can prove that there is exactly the amount of energy stored in the transmission line necessary to support the forward joules/sec and reflected joules/sec readings. Why violate the laws of physics to try to come up with some other more esoteric explanation than forward and reflected EM traveling wave energy moving at the speed of light? It's kind of a boring problem though. Personally, I think it's more interesting and enlightening to consider what goes on prior to steady state. That's exactly what I have done. During the initial transient build-up period, *exactly* enough energy is supplied by the source to the transmission line to support the steady-state forward and reflected joules/sec - no more and no less. If the source is disconnected during steady-state, the energy stored in a lossless transmission line is dissipated in the load during that final transient decay period. -- 73, Cecil, http://www.qsl.net/w5dxp |
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