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On Sun, 12 Jun 2011 20:31:42 -0700 (PDT), walt wrote:
On Jun 12, 11:14*pm, Richard Clark wrote: On Sun, 12 Jun 2011 19:09:29 -0700 (PDT), walt wrote: the series stubbing appears in Reflections, Chapter 23, with the same values as I presented above, with detailed diagrams shown in each step in the progression of the explanation. I hope these diagrams can help. In other words, consult:http://www.w2du.com/Chapter%2023.pdf Figures 1 through 5 As I said in the previous post, the experts were referring to the output of the RF amp as not establishing a reflection coefficient rho = 1.0, which has put me in a corner. Hi Walt, How so? *(What is the corner?) 73's Richard Clark, KB7QHC The corner I'm in, Richard, is that In Reflections 3, Chapter 25, In other words, consult: http://www.w2du.com/r3ch25.pdf I assert that Steve Best's Eq 8 in the first part of his three-part article appearing in QEX is invalid, because it gives incorrect answers when I plug in what I believe are correct values of reflection coefficients. Yet his equation agrees with that of Johnson on Page 100 of his "Transmission Lines" text book. In addition, a mathematics expert whom I respect says Best's equation is correct. So I've got to make the decision whether to delete my criticism of his equation or leave it in and be accused of criticizing him incorrectly. What to do! Walt Hi Walt, So this is not only double-deep, through your work to Steve's, but triple deep then through Steve to Johnson. Lacking the necessary, culminating edition of Johnson's, I still don't know what the corner is. Lacking the complete math from all sides of the argument (not somewhere I would like to go), and noting that many authors (not making attributions here) frequently ignore some relatively basic mandates where they don't matter, to then expand into situations where they do matter; then I don't really trust heavily editorialized math analysis. I note your summary statement for Steve that you find contentious, viz. "A total re-reflection of power at the match point is not necessary for the impedance match to occur." is one where I would agree with Steve; but not necessarily for reasons brought forward. What is worse, this simple statement may mean three things to two people. 73's Richard Clark, KB7QHC |
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