Cecil Moore wrote:

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?

Hi Cecil,

The entire point of Richard's citation is that VF is a function of
pitch to circumference ratio. It explains the very thing that you
need to support your argument about phase delay across a coil. It's
what I meant when I said "I still think it would be prudent to explore
and understand the precise nature of the delay through the coil more
thoroughly before making too many assumptions about this."

Beyond that, I don't understand the question. Kraus is pretty
explicit. I didn't see much need to read between the lines. But all
I have to look at is the scanned version on the web that someone
posted a link to a week or so ago.

You should send Richard H. a fruit basket. Who woulda thought to look
under Helical Antennas. :-)

73, Jim AC6XG