[SOC] Need formula

[Ian C. Purdie]

Rob Matherly wrote:

> Can anyone tell me the formula to figure the inductance of an air core
> coil with spaces between the turns?  I can't find it in my handbook
> (probably not looking in the right place), and the only online
> calculation deals I can find don't account for spacing between the turns.

Rob,

Didn't see anyone answer you yet.

They should if you are using the 9A + 10B formula. Where B is length of your
coil and takes into account spacing between windings.

FORMULA:

L =[A (sq) X N (sq)]  / [9A + 10B]

Where:

A = radius of coil in inches
N = number of turns
(sq) = squared
B = length of coil in inches


72/73's

Ian C. Purdie
Budgewoi N.S.W. Australia - Co-ords S33�14', E151�34'
VK2TIP "I'll give ya the TIP mate" QRP-L #1978. SOC #171 FP#91
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