On May 4, 6:45*am, Cecil Moore wrote:
John KD5YI wrote:
"Cecil Moore" wrote in message
A 75m Texas Bugcatcher loading coil certainly
qualifies as a distributed load being about
1/8WL long.

A 75m Texas Bugcatcher loading coil is about 30 feet long?

*Electrically*, yes. Its velocity factor calculates
out to be about 0.02 at 4 MHz and it is physically
0.563 feet long. 0.563'/0.02 = ~28 feet.

At 4 MHz, a 75m Texas Bugcatcher coil replaces ~28 feet
of wire in the antenna. That is ~41 degrees at 4 MHz.
(Note there is about 44 feet of wire in a 75m Texas
Bugcatcher loading coil.)

Equation 32 in the following IEEE paper is what I used
to calculate the velocity factor of the loading coil.

http://www.ttr.com/TELSIKS2001-MASTER-1.pdf
--
73, Cecil, IEEE, OOTC, *http://www.w5dxp.com

In part II of the said Corum paper it clearly states that there is no
rigourous solution to helicals supplied by Maxwells laws. If this is
the case I suspect that Corum made some approximations. This is the
point that I am making with respect to Maxwell's law's and lumped
loads.