I may be way wrong here, but I seem to think that the capacitance of a coil
is directly proportional to the not shielded surface area of the wire. As
such, I think your capacitance is going to be nearly identical to a single
layer coil. Again I may be wrong, but it also seems to me that folks have
made coils of single, bi-, and tri-filiar windings and used them more or
less interchangeably, with minimal tuning, to determine the advantages of
each, but I might be remembering incorrectly.
On Wed, Mar 16, 2016 at 6:55 PM, jj@xxxxxxxxxxxxx <jj@xxxxxxxxxxxxx> wrote:
>
>
> Hello all,
> I acquired a small bifilar secondary coil with the following
> characteristics:
> the coil form is phenolic
> the coil form is 33.5" long, 4" in diameter with a wall thickness of .25"
> winding length is 30.25", 13 turns per inch
> wire diameter is .072" (about AWG 13)
> Wire is covered with cloth insulation with a thickness of .039"
> first helix has an inductance of 524 uh and the second is 528 uh
>
> I do not have the appropriate equipment to measure its parasitic
> capacitance.
>
> Would someone please help me to calculate its resonate frequency or at
> least point me in the right direction?
> I have not been able to find a Tesla coil calculator program that does
> bifilar coils.
> Any and all help will be highly appreciated.
> Thanks to everyone,
> JJR
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>
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