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#8
September 3rd 03, 01:00 AM
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"David or Jo Anne Ryeburn" wrote in message ... In article , (Dr. Slick) wrote: "David Robbins" wrote in message ... From 'Fields and Waves in Communications Electronics' by Ramo Whinnery and Van Duzer. section 1.16 and 1.23 start with positive moving wave plus negative moving wave = total to load for both voltage and current, simple kirchoff's law summations at the junction of the coax and load. Vp+Vn=Vload (1) Ip-In=Iload (2) note that their convention is that current moving to the 'right' is positive so the reflected 'negative' current wave is moving left which gives the negative sign on the second term. now use ohm's law to rewrite (2) Vp/Zo - Vn/Zo = Vload/Zload (3) I believe this line (3) is only true if Zo is purely real. If Zo is complex, i don't think you can apply this. I swore that I wouldn't get into this one, but enough's enough. Equation (1) is an application of Kirchoff's voltage law. Equation (2) is an application of Kirchoff's current law. Equation (3) results from (2) if you apply Ohm's law three times, to the three terms in Equation (2). Which of these three principles (Kirchoff's voltage law, Kirchoff's current law, or Ohm's law) is the one you don't believe? Or do you disbelieve more than one of the three? now, now, take it easy on him... he didn't say he didn't believe kcl or kvl or ohm's law... he just doesn't understand that they still do apply to phasor notation used in sinusoidal steady state analysis. an easy misunderstanding. |
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