Jim Kelley wrote:
I didn't quite grasp the purpose of your bolt comparison, Richard. The
only limits Kraus puts on helices is that they are helical - anything
between a flat single turn loop at one limit and a straight line at the
other.

My 3rd edition only shows coil circumferences between 0.6
and 1.5 wavelengths. But the relative phase velocity is
1.0 when the circumference is 1.1 wavelength and the pitch
angle is 5 degrees. If the relative phase velocity is 1.0
when the circumference is 1.1 WL, doesn't that imply a
change in VF away from a straight piece of wire?
--
73, Cecil http://www.w5dxp.com