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Re: Primary size
I have heard (not having done extensive experiments myself) that having the
diameter of the primary be comparable to the height of the secondary is
good from a field distribution standpoint. HOWEVER, this probably really
applies to smaller table top coils, where the primary is serving as a
counterpoise for the top load. Electrum had the primary inside the
secondary, for instance. It is probably more an issue of coupling and
insulation (preventing arcing from primary to secondary). The coupling
issue is, in turn, an issue of charging currents for the primary circuit
(more current means you can use higher coupling)
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Primary size
> Date: Tuesday, April 06, 1999 11:04 AM
>
> Original Poster: Michael Tucknott <Michael.Tucknott-at-virgin-dot-net>
>
> Hi all
>
> Can somebody tell me the relationship between secondary
> size(Inductance/capacitance)
> and the primary coil.
> I plan too build a flat spiral on a moveable base(so I can adjust the
> coupling)it
> will be built from 0.25" copper tube with 0.25" space between turn.
> The dia of the inside turn will be 11" or so.
>
> Now the first coil I built had 10 turns but was taped at 4.75 turns so
> were
> the extra outside turns unnecessary.
>
> I want to keep the coil foot print as small as possible.
>
> Thank in advance Mike Tucknott
>
>
>
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