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Keith Dysart wrote:
My mistake. But it is difficult to know your position when you don't indicate clearly that you disagree, so I thought that with your reply you were agreeing. Apologies. I don't disagree with anyone's metaphysics. What you do inside your own mind is none of my business. (In my mind, I can still dunk a basketball.) This is a bit of a non sequitur. So what is it that you really disagree with in the analyses performed by myself and others? I have told you many times. Bench test measurements performed over the past 20 years or so prove that it works only in your mind, not in reality. The source impedance of a typical ham transmitter remains somewhat of a mystery during actual operation. The arguments continue to rage after decades of bench test experiments and measurements. The pages of QEX are filled with those arguments. A generator with a 450 Ohm source impedance ... False assumption. That transmitters's source impedance changes away from 450 ohms just as soon as the reflections arrive incident upon the source, i.e. the source impedance is a *variable* that depends upon the magnitude and phase of the reflected wave. If your source impedance is constant, it doesn't match real-world conditions. I think you object to computing the amount of the reverse wave that is reflected at the generator by using the source impedance. I certainly don't object to your computations but the results of those computations have been disproved on the bench using real world ham transmitters over the past 20 years or so. Your simple mental model doesn't correspond to reality unless you take some extraordinary steps which deviate from real-world ham transmitters. Have you taken the time to review those experiments? -- 73, Cecil http://www.w5dxp.com |
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