Keith Dysart wrote:
It might best be called a hypothesis, but I don't think
it requires that electrons move at the speed of light,
rather charge move at the speed of light.

Anything moving at the speed of light in a transmission
line is photonic in nature. The nature of photons is
well known and they do not repel each other. They have
electric and magnetic fields but no charge. So there's
no charge moving at the speed of light in a transmission
line.
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73, Cecil http://www.w5dxp.com