Hi Rik

L = inductance (nH)
N = windings
D = average coil diameter (cm)
H = coil length (cm)
C = thickness of the wirelayers (all together, in cm)
K = correction factor depending on H/C ratio :
L/C K
2 0.10
3 0.15
5 0.23
10 0.27
15 0.30
20 0.31
30 0.32

2. For 'fat' coils (H<=D) : L = 78*L^2*D/(3*D+9*H+10*C)

I will use the 'fat' coil formula because with my coil D = 60cm and H =
18.2cm

I don't understand the L^2 in the formula because L is what I am trying to
find.

Regards,
Peter, G3LDO

e-mail <[email protected]>

Web <http://web.ukonline.co.uk/g3ldo>