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Keith Dysart wrote:
Are you sure? Rs Vg Pfor--25w Vl +----/\/\/-----+----------------------+ | 50 ohm 23.08w--Pref | | 48.08w / 1.92w Vs 45 degrees \ Rl 100 cos(wt) 50 ohm line / 1 ohm 50w \ load | | +--------------+----------------------+ gnd As a matter of interest, let's return to the 45 degree line, the one to which I objected previously. The forward power and reflected power are the same as in the previous example but now the dissipation in Rs is equal to the sum of the forward power and reflected power. (It would be nice if all cases were as straight forward as this special case.) This is indeed the one special case where everything you have been saying is true. There is no redistribution of energy because there is no interference. There is no interference because at Vg, Vfor and Vref are 90 degrees out of phase. These concepts are covered in my magazine article at: http://www.w5dxp.com/energy.htm -- 73, Cecil http://www.w5dxp.com |
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