Jim Kelley wrote:
"Fig. 7-19 is certainly interesting."

Jim`s cryptic statement sent me on a search.

Eureka! My 1950 version of Kraus has that Fig. 7-19 on page 193. It
shows propagarion velocities found by several researchers as a function
of helix circumference.

Phase velocity is the velocity at which a point of constant phase is
propagated in a progressive (traveling) sinusoidal wave.

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:
Eureka! My 1950 version of Kraus has that Fig. 7-19 on page 193. It
shows propagation velocities found by several researchers as a function
of helix circumference.

Phase velocity is the velocity at which a point of constant phase is
propagated in a progressive (traveling) sinusoidal wave.

My 3rd edition, shows the lack of a 1:1 correspondence between
the circumference of a turn and the phase velocity of that
turn. If one projects Kraus' graph back to 0.006 wavelength
for the circumference of the coil, the lack of correspondence
should become pretty large, maybe even matching my reported
EZNEC results?
--
73, Cecil http://www.w5dxp.com