Richard Clark wrote:
None of your work appears by your admitted laxity. None of your
testing appears by lack of its accomplishment.

My testing results have been reported. Here are the results
of the VF calculation for my 75m bugcatcher coil.

The test for physical structure is met. The paper asserts
that the expression gives acceptable results with errors
less than 10%.

The VF of my 75m bugcatcher coil calculates out to be
VF = 0.0175 at 6.6 MHz where it measured to be self-
resonant. That self-resonant measurement included
a length of coax and a one foot bottom section so the
actual self-resonant frequency will be somewhat higher
than I measured. I could probably make a calculation
to adjust for the coax and bottom section.

The VF calculated directly from the too-low self-
resonant frequency was 0.015 which is 14% different
from Dr. Corum's equation. Given the uncertainly in
the exact self-resonant frequency in my measurements,
that's pretty reasonable. Ballpark is all we need
to understand the concepts.

Working backward, Dr. Corum's VF would make the
coil self-resonant at 7.7 MHz. There's probably
enough slop in my measurement configuration to
account for the 1.1 MHz difference.
--
73, Cecil http://www.qsl.net/w5dxp