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[Towertalk] SWR & Speed of Light?

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Subject: [Towertalk] SWR & Speed of Light?
From: (Jon Ogden)
Date: Thu, 26 Sep 2002 06:51:28 -0500
on 9/26/02 1:01 AM, Michael Tope at wrote:

> Group velocity or perhaps more aptly "information velocity" is always less
> than or equal to the speed of light in a vacuum, but the "phase velocity" or
> the speed at which a constant phase point on an electromagnetic wavefront
> progates along the wall of a waveguide can actually exceed the speed of
> light in a vacuum. This is analogous to a wave hitting the beach at a
> slightly
> oblique angle (as opposed to head on).

Thank you for the correction!  You are right.  Been a long time since I
studied EM wave theory!  That was a good refresher course!



Jon Ogden
NA9D (ex: KE9NA)

Life Member: ARRL, NRA
Member:  AMSAT, DXCC

"A life lived in fear is a life half lived."

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