The normal mode helix was covered in some detail in a 1974 (!!) edition
of Radio Communication with a set of empirically determined equations
for calculating resonance and winding dimensions. Seem to remember it
was by the famous D A Tong, but I may be mixing it up with another
article. I found the equations to be a good starting point from which
to fine tune helials for HF. Used to have a copy of that RadCom, and
it may still be lying on a shelf somewhere.
I haven't been able to find this article - if you can find any more info I
would be grateful.
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