Cecil,

Why don't you go back and re-read that paper carefully. Pay particular
attention to the part where the author says, with emphasis, that the
magic formula only works when the coil is near or at resonance.

Your extension to arbitrarily lower frequencies is pure nonsense.

I guess you did not read my complete message. I pointed out the exact
location in the paper where this limitation is explained.

73,
Gene
W4SZ

Cecil Moore wrote:
Gene Fuller wrote:

I gave you a very specific reference to demonstrate your supposition
was incorrect. You came back with nothing but, "Because I say so." You
have not offered one shred of backing for your constant Vf argument.


Where the heck have you been? The equation for VF is equation (32)

at: http://www.ttr.com/TELSIKS2001-MASTER-1.pdf

Just before that equation for VF is a geometry test for the
coil in question. A 75m bugcatcher coil passes that test.

The velocity factor equation contains helix diameter, turns
per unit length, and wavelength. If we keep those three
quantities constant, the VF of a coil should remain constant
while varying the length of the coil.

The problem encountered previously was we kept the coil length
constant while varying the frequency. That does change the VF.
But this time we are keeping frequency constant.