Cecil Moore wrote:
Tom Donaly wrote:
I put the dimensions ... into ON4AA's
calculator and got a self resonant number of 7.4137 Mhz. When I measured
it, though, it was 8.93 Mhz. Where did I go wrong?

The self resonant frequency of a coil varies wildly
with the ground provided. What ground did you provide?
Perfect? Average? None?

If that's true, the Corum brothers should have included that in
their formulas.
73,
Tom Donaly, KA6RUH

Tom Donaly wrote:
If that's true, the Corum brothers should have included that in
their formulas.

Their formulas assume a near-perfect ground plane.
See Figure 2.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com