Amazing explanation of impedance matching

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Here is a video from 50s by AT&T explaining waves, impedance and impedance matching:http://www.youtube.com/watch?v=DovunOxlY1k.

This is amazing explanation.

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Wow. That was a very good educational presentation. A talented guy :)

Thanks Alex!

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I am very pleased to see that Dr Shive resisted the temptation to terminate his excellent presentation with a "goodbye wave" :lol: {all puns are mine (TM)}

Ross McKenzie ValuSoft Melbourne Australia

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This is very much in the mold of "PSSC Physics" which was the American response to Sputnik and the fear that we were falling behind the Russians.

That said, it demonstrates both a deep insight into wave propagation and idea that waves are a phenomenon that is important in many physical systems. Dr. Shive really did an excellent presentation and I highly recommend it. Wish I'd had access to it while studying Physics and Electrical Engineering.

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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Any details on how that "machine" is constructed? It would be a Really Cool Thing [tm] to build/have. Sort of the natural scienses nerds answer to the lava lamp.

I sort of sense that the crux is in having a rod that accepts a certain amount of torsion in s "springy fashion", and that the mass and length of the "cross-rods" determines the slugishness of the medium.

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It looks like a rubber central rod and metal cross-rods. The problem is find the right kind of rubber.

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I think there were a few frames that provided some detail.

One can relate it to a pendulum, because each arm is a pendulum and they are all coupled together. As in a pendulum, the natural frequency of each arm is related to the effective length of the arm (eg, the location of the center of mass), the amount of mass, and the restoration force. Being horizontal instead of vertical (the normal pendulum orientation)(, the restoration force is not gravity but is the torsional force provided by the center bar.

When its more convenient, I will go back and see what can be seen about construction.

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net