multi-layer air coil

Multilayer air coil

The program allows you to calculate the inductance L' of a multilayer air coil. The principle for calculating inductance was taken from the book "Construction and Assembly of Amateur Radio Systems" by Zbigniew Faust.

	Winding diameter D		[cm]
	Number of turns n		[cm]
	Winding length l		-
	Winding height h		[cm]
	Number of sections m		[cm]
	Coupling coefficient k		-
	Section inductance L		[mH]
	Coil inductance L'		[mH]

Practical notes:

Multilayer air coils, mass-wound turn by turn, are used for inductances of several tens of mH (basket winding using a special winder is also used).
The coupling coefficient k between adjacent coil sections depends on the dimensions of the sections and their mutual distance. In practical systems, the most common relationship is b = 2l. In such a case, the coupling coefficient k is in the range <0.25, 0.4>.