Cecil,

Since you have fallen back to the old "round and round the helix" model
there is little hope for agreement. It is interesting, however, that
even the Corum model for Vf at resonance is not as slow as the purely
geometric model. Must be those standing waves again.

73,
Gene
W4SZ

Cecil Moore wrote:
Gene Fuller wrote:

You are the expert on Vf. You assert without proof that a half-length
coil has the same Vf as the full-length resonant coil. OK, even if I
accepted that supposition, what happens at a quarter-length or at a
tenth-length? I am simply asking how the function changes between the
"known" limits of 1.0 and 0.02. You have repeatedly ducked any sort
of answer.


Seems Richard Clark has proven that it doesn't change between
the "known" limits of 1.0 and 0.02. Where did those "known"
limits come from anyway?

For a single turn coil, seems the VF would roughly be the pitch
divided by the circumference, something that would equal 1.0 only
when the pitch and circumference were equal.

For the 4 TPI, 6" diameter coil, the VF formula yields 0.02.

The pitch divided by the circumference yields 0.013.