Cecil Moore wrote:
Jim Kelley wrote:
How well does your answer compare with the curves in Fig. 1 given the
number of turns in a Bugcatcher coil?

Since the curves are generated from the equation,
they should match perfectly. As a matter of fact,
I have a dot on that graph at 0.004 and 5k. The
VF is ~0.02.

Presumably there is a lower limit to the number of turns the coil would
have to have, or an upper limit to the pitch angle, in order to behave
as described - a helical sheath. Tesla coils usually have at least a
few hundred turns wound closely together, and often operate at
wavelengths considerably longer that 75 meters. One could easily argue
that 30 turns do not a Tesla coil make, in which case Eq. 32 would not
apply.

ac6xg