Similiarities of Wave Behavior by AT&T

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From the 1950’s, but still a fantastic video explaining basis concepts of wave travel, superposition, impedance and impedance matching. If you ever wondered why waveguide works, I do not think there is a better explanation than this. And all of this is done on a “simple” mechanical device, I which I find it way more convincing then computer simulation. I really enjoyed watching this, hope you do too…
https://www.youtube.com/watch?v=DovunOxlY1k&list=WL&index=3
 
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