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Primary size



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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