[Antennas] Inductors

[James Duffer]

>Info needed for inductors or loading coils.
>
>If a have a cylindrical form (say 1in dia by 12 in+ long) and wrap wire 
>around the
>circumference of the form with so many turns per inch ( 8 per in). Then I 
>would have
>

>L = 2 * pie * r * l * t/in  = 2 * 3.14159* 1 *12 *8 = 50.25 ft

Was temporarily confused, being L is normally the symbol for 
inductance.....if Length has of been spelled out, that would of clarified it


>
>Inductance = a**2 * n**2 /  (9a + 10 b) = 1* (12*8)**2/ (9 + 10*12) = 71.44 
>uh.
>
>Now, if instead of wrapping the wire around the circumference, I loop the 
>wire from
>one end to the other then back to the first end, then down to the second 
>end, etc
>working around the circumference spacing the wire at 8 stands per in, I 
>will use the
>same amount of wire.  What would the inductance be?
Could you not use the same formula?  Just guessing.

>
>Breaking the form open and making a flat coil would give a preposterous
>inductance.  How would the inductance be calculated?  Maybe easily 
>measured.
>
>Anyone know?
>
>Chris opr VE7HCB

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