[Amps] Re: compact coils...

[Japerlick at aol.com]

......."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