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W5DXP wrote: Jim Kelley wrote: The waves themselves are indeed identical, i.e. you can't measure a difference between them on a transmission line. But one might indeed be transferring energy while the other is not. How can two waves that are identical possibly be doing different things. It doesn't make any sense at all. Waves cannot exist without intrinsic energy!!! If any wave is destroyed, it gives up its energy. There is simply no other place for the energy to go. Here's a quote from Born and Wolfe, pg. 48, talking about waves encountering the interface between dense and less dense media: "Although there is a field in the second medium, it is easy to see that no energy flows across the boundary. More precisely it will be shown that, although the components of the Poynting vector in the direction normal to the boundary is in general finite, its time average vanishes; this implies that the energy flows to and fro, but that there is no lasting flow into the second medium." Please reference the cross-posting from sci.physics.electromag. Somebody predicted that those guys would tear me apart. On the contrary, they tend to agree with me. I tended to agree with what you said there too. You can be very agreeable when you want to be. :-) I notice you didn't mention anything about photons dematerializing and rematerializing over there. Give that one a try. :-) Those reflected waves not only destructively interfere, they are destroyed so they MUST give up any intrinsic energy in the waves. Nothing else is possible. If you mean they give up their energy to the two waves traveling in the other direction, then I agree. Can I have a hit off whatever you are smokin'? :-) I've got a pack of Camel lights out in the car. You can have 'em. That would only be true if energy were indeed traveling in the reverse direction to begin with. When we realize it's not, there's nothing left to account for Cecil. If reflected energy from a mismatched load is not traveling in the reverse direction, pray tell what direction is it traveling in? P2 is energy that had been traveling in the reflected direction and was re-reflected. That's it. Good thing too, because any more than P2 and P1 and you'd have a perpetual motion machine! :-) I can see you haven't referenced the reflected power flow vector. I've seen you reference it, but I have seen you define one - or write it out mathematically. There's no conservation of energy problem to solve. There certainly is in your scenario. The reflected energy doesn't ever change directions but it somehow joins the forward wave anyway. Can you spell B-A-F-F-L-E-G-A-B? You wrote the bafflegab - whatever that is. I certainly never said reflected energy joins the forward energy. That's your invention. 73, ac6xg |
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