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Jim Kelley wrote:
A standing wave interference pattern is a result of the presence of traveling waves. One does not replace the other. Exactly what I have been saying for years against some stiff opposition - welcome aboard. You missed the point which is: If one parses all the energy to the standing wave, it cannot separately be parsed to the traveling waves. Doing so would violate the conservation of energy principle. I you were producing numbers which made sense and were correct, we wouldn't be having this discussion, Cecil. A wave is at various phases along it's length. The phase varies from 0 to 360 every complete cycle. This includes standing waves. Its phase is not "zero" at every point. You obviously don't understand. Whatever the actual phase angle is, for a pure standing wave, at any instant of time, it is constant all up and down the standing wave. NOBODY HAS EVER SAID IT IS ZERO AT EVERY POINT!!! Such an allegation is a ridiculous blowing of smoke. The EZNEC results you refer to are an archetypal example of the effect. The EZNEC results are what they are and have been confirmed by w7el himself. All I can say is: Please correct your mistaken concepts and then rejoin the discussion. What is it about the following EZNEC results that you don't understand? Do you need help in comprehending that a 2.71 degree phase shift in 90 degrees of antenna is a shortfall of 87.29 degrees? EZNEC+ ver. 4.0 thin-wire 1/4WL vertical 4/17/2009 2:57:42 PM --------------- CURRENT DATA --------------- Frequency = 7.29 MHz Wire No. 1: Segment Conn Magnitude (A.) Phase (Deg.) 1 Ground 1 0.00 2 .97651 -0.42 3 .93005 -0.83 4 .86159 -1.19 5 .77258 -1.50 6 .66485 -1.78 7 .54059 -2.04 8 .40213 -2.28 9 .25161 -2.50 10 Open .08883 -2.71 If w7el "measures" the phase shift between segment 3 and segment 7, he will "measure" 1.21 degrees. The actual delay between segment 3 and segment 7 is about 36 degrees. When will anyone understand that fact of physics? -- 73, Cecil, IEEE, OOTC, http://www.w5dxp.com |
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