On Oct 18, 11:20*am, Jim Lux wrote:
You can see that for this kind of coil, the coupling from turn to turn
must be pretty low.

For an average air-core coil, the delay through the coil seems to be
in the ballpark of half of the coil wire stretched into a straight
line, i.e. the VF of the coil is about double what is the VF of the
straight wire used to wind the coil. The turn to turn coupling exists
but turn to far away turn coupling is very low.

This seems to be the most accurate inductance calculator that I have
seen and includes the characteristic impedance and axial propagation
factor.

http://hamwaves.com/antennas/inductance.html
--
73, Cecil, w5dxp.com