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David G. Nagel wrote:
Cecil Moore wrote: If we have one amp of forward RF current and one amp of reflected RF current, which direction is the sum of those currents flowing? I was taught that under these circumstances DC and RF work differently. Yes your DC net current is zero. Your new RF current is one amp in each direction. Yes, that is true, but EZNEC doesn't report the two separate currents. EZNEC reports the phasor sum of those two currents in magnitude and phase. So the question still remains: In which direction is the total current reported by EZNEC flowing? What does the unchanging phase really mean? EZNEC says that, referenced to the source phase, the phase of the phasor sum of the forward and reflected currents is UNCHANGING. It makes no sense to pick a direction of flow for the sum of two equal currents flowing in opposite directions. Standing wave current doesn't flow in the commonly accepted meaning of "flow". Standing wave current just stands there. I received the following email from a physics professor: "As for the standing waves, they really aren't independent creatures. They're an artifact - a construct which happens to look like the superposition of fields which surround the antenna. But the fields which superpose look like the traveling waves. The traveling waves really tell the story." -- 73, Cecil http://www.qsl.net/w5dxp |
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