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Self Capacitance of an air core coil
Medhurst formula

Capacitance (pF) = K * Diam (cm)

where K is an empirical function of Length/Diameter

L/D
K
5.0
0.81
4.5
0.77
4.0
0.72
3.5
0.67
3.0
0.61
2.5
0.56
2.0
0.50
1.5
0.47
1.0
0.46

Summarized from Medhurst in Wireless Engineer V24.281 (Feb 1947) page 35, and V24.282 (May 1947), p. 80 by Rzeszotarski


Copyright 1998, Jim Lux / medhurst.htm / 24 Jan 1998 / Back to HV Home / Back to home page / Mail to Jim

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