......."Has anyone ever seen a multilayer approach to this portion of the
coil?? For instance 3 layers spaced 1/4" apart radially...."
There are two problems with the multilayer winding approach. First you need
to account for voltage breakdown across the windings depending on how you
stagger the windings. For example, if you made a two layer coil, starting at
one
end, winding to the far end, then returning on the 2nd layer, you would have
full coil voltage across the 1/4 inch spacing.
The second problem is this approach significantly increases the interwinding
capacitance of the coil. It will reduce the self-resonant frequency of the
coil and could degrade the coil's LPF effects (which we rely on for harmonic
rejection).
A better approach might be to add a large toroid core inductor (probably
needing multiple stacked cores) for the 160 meter position.
John
K0UM
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