
Version 3.86 of my Windows coil calculator is here:
http://ham-radio.com/k6sti/coil.zipSee README.TXT to install the program.
Some recent changes:
Accuracy
I've refined the inductor model. Average error magnitude is 2.0% for L and 4.8% for Q on a set of test coils measured with an HP 4342A Q meter. See COILS.TXT for details.
Litz Wire
COIL handles Litz wire with 0.02 mm strands, available from Electrisola. Use this wire to make coils with very high Q up to about 10 MHz.
Coil Shape
I've added octagonal, hexagonal, and square shapes. Some long-wave experimenters use polygonal loading coils wound on a cage of PVC pipe.
Form Contact
This is the percentage of the winding in contact with the dielectric. Use it for coils with dielectric ribs (Air Dux), ridges (ceramic and phenolic forms), or wound on a polygonal dielectric cage.
Dielectrics
I've added a number of common plastics as well as cardboard, the latter for your kid's crystal set coil wound on an oatmeal box.
Metals
I've added several kinds of copper and aluminum. I include information and references on the effect of tin plating.
Optimizer
The optimizer varies selected coil parameters to maximize Q while keeping inductance constant. Due to code refinement and use of assembly language, it now runs virtually instantaneously even on older computers.
Brian