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#13
November 3rd 07, 03:23 PM
posted to rec.radio.amateur.antenna
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"Waves of Average Power"
Cecil flunked E&M in kindergarten.
"Cecil Moore" wrote in message t... K7ITM wrote: On Nov 2, 3:58 pm, Cecil Moore wrote: Do you know of any way to achieve wave cancellation without any interaction between the waves? It's called "vector addition," not "interaction." But you already clarified that, so I don't know why you are going on about it. Vector (phasor) addition is necessary but *not sufficient* for wave cancellation to occur. For wave cancellation to occur, the two waves must be coherent, equal in magnitude, opposite in phase, and *collinear* in the same direction. Vector (or phasor) addition can occur with or without "interaction". Wave cancellation cannot occur without "interaction" between the two waves. If the two interfering coherent waves survive the interference, they did not "interact" probably because they were not collinear. If the two interfering waves do not survive the interference, they interacted, were canceled, and their energy was "redistributed to regions that permit constructive interference" as described on the FSU web page. -- 73, Cecil http://www.w5dxp.com |
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