steveeh131047 wrote:
In contrast, the ON4AA calculator - based on Corums' transmission-line
analysis - does just that, and produces results which seem to match
well the EZNEC modelling results.

I don't see where that calculator gives the Z0 and VF
of the loading coil so I have generated an EXCEL file
that gives those two parameters based on the formulas
in Dr. Corum's IEEE paper. Note that 75m loading coils
are slow-wave devices with a VF in the neighborhood
of 0.02 for a Texas Bugcatcher coil or 0.033 for w8ji's
skinny 10 TPI, 2" diameter coil.

http://www.w5dxp.com/CoilZ0VF.xls
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com