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Denny wrote:
1. A standing wave is not 'standing' in time... It phase rotates at the same rate as the excitation frequency... Yes, but that rotation is occurring at a fixed point on the wire. The standing wave is not moving - it is just rotating in a fixed place on the wire. Standing waves do not flow. They are basically an illusion created by the superposition of two traveling waves. 2. It is real because I can measure it with a volt meter and I can extract power from it with a lamp, simultaneously.. You cannot extract steady-state power from standing waves. You can only extract steady-state power from traveling waves. However, you can extract transient-state power from standing waves. That's what happens at key-up - the energy in the standing wave is radiated after the source is disconnected. Try this thought... A Tesla coil (automobile spark coil) with no load on the output is all standing wave voltage and no current - so according to some has no power... Touch your finger to it... When you touch your finger to it, it is no longer steady-state. Standing waves can and do give up their energy as joules/sec power during transient states. But they change during that process. -- 73, Cecil http://www.w5dxp.com |
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