> "The 160 meter portion, even employing a reduced diameter
conductor,
> requires almost half the total space in a Pi-Coil.
>
> Has anyone ever seen a multilayer approach to this portion of the
> coil? For instance 3 layers spaced 1/4" apart radially.
>
> Five turns of #8, space wound 5 TPI on each layer 1" wide at a
2.5"
> average (2" - 2.5" - 3" layers) diameter would provide something in
the
> vicinity of 17 uH. This is approximately double the inductance of
the
> same amount of wire wound with at the same pitch in a single layer.
>
> It might take a bit of creativity to wind but, with a suitable
form,
> it could be fabricated starting with the innermost layer at the
output
> end.
>
> This approach would increase the interturn C somewhat but, I doubt
if
> that matters all that much on the "Topband"."
one approach reducing coil length could be this:
http://www.pbase.com/df3kv/image/34219012/large
73
Peter
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