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December 2nd 07, 12:37 AM posted to rec.radio.amateur.antenna

Richard Clark Richard Clark is offline

Richard Clark is offline

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On Sat, 1 Dec 2007 16:59:43 -0600, (Richard
Harrison) wrote:

Terman says on the "Mechanism of Operation of the Traveling-Wave Tube"
at the bottom of page 678:
"The applied signal propagates around the helix and produces an electric
field at the center of the helix that is directed along the helix axis.

Hi Richard,

Do you want to comment on the sense of how a TWT helix in relation to
its wavelength of operation must impose a considerable operational
difference compared to a 2 inch diameter, 10 inch long coil at 80
Meters wavelength?

73's
Richard Clark, KB7QHC

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