[Lowfer] Coil Calc ?

[Peter Barick]

LowFers,

Been thinking about the recent discussion on LF Loading Coils we had.

From that and being aware of good coil design practices, one can
conclude the a good LF Loading Coil can have these properties:
	1. Low Res wire, preferably non-plastic insulation; enameled ok;
litz best
	2. D/L ratio > 2 : 1
	3. Close turns spacing, touching is best at LF
		 (this is what denigrates use of house wire)
	4. Minimal metal in the aperture of the LF coil, i.e., a good,
nonconducting
		coil former: pvc, varnished wood.

There may by others. But considering these for now, and esp. turns
spacing, can a good coil be made by winding turns upon themselves
thereby producing a "compact" coil, or will this kill its Q? This may be
called a multi-layered solenoid (?).

If this is acceptable, how is L calculated?

Comments?

Peter