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If the windings are spaced apart, at some point a coil becomes a “helical wind.” True?
It seems to my foggy memory that I may have read somewhere that coils need not necessarily be “round,” which is of course the most common form, but could be rectangular, triangular or some odd geometry. I have made a triangular coil but so far have not tapped it to the proper resonance. But so far as I know these various shapes have no advantage over plain round coils.
As a question of pure curiosity I wonder if perhaps some advantage would be gained by avoiding using the same diameter throughout the whole coil, but started with a small diameter and making each winding successively larger, like an ice cream cone.
The loading coils used in Part 15 are generally described as being in-line with the vertical element, however there may be an advantage to mounting the coil at a right angle to the stick, based on this quote from “Radio Handbook”, page 19.16, by Wm. Orr: “It was found that mounting the loading coil at right angles to the whip greatly improved the Q.”