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Re: Tapered Secondary Coil
Tesla List wrote:
>
> > > > Subject: Tapered Secondary Coil
> > > Subject: Re: Tapered Secondary Coil
> > > > Subject: Tapered Secondary Coil
> > Subject: Re: Tapered Secondary Coil
> > > > Subject: Tapered Secondary Coil
> > > Subject: Re: Tapered Secondary Coil
> > > > Subject: Tapered Secondary Coil
>
> >From hullr-at-whitlock-dot-com Fri Dec 6 23:50:37 1996
> Date: Tue, 28 Mar 2000 21:53:48 -0800
> From: Richard Hull <hullr-at-whitlock-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Tapered Secondary Coil
>
> Tesla List wrote:
> >
> > > > Subject: Tapered Secondary Coil
> > > Subject: Re: Tapered Secondary Coil
> > > > Subject: Tapered Secondary Coil
> >
> > >From sgreiner-at-mail.wwnet-dot-com Thu Dec 5 22:59:16 1996
> > Date: Thu, 05 Dec 1996 15:17:29 -0800
> > From: Skip Greiner <sgreiner-at-mail.wwnet-dot-com>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Tapered Secondary Coil
> >
> > Tesla List wrote:
> > >
> > > > Subject: Tapered Secondary Coil
> > >
> > > >From bert.hickman-at-aquila-dot-comSat Nov 23 20:04:43 1996
> > > Date: Sat, 23 Nov 1996 09:35:07 -0800
> > > From: Bert Hickman <bert.hickman-at-aquila-dot-com>
> > > To: tesla-at-pupman-dot-com
> > > Subject: Re: Tapered Secondary Coil
> > >
> > > Tesla List wrote:
> > > >
> > > > >From scottb-at-aca.caFri Nov 22 20:30:34 1996
> > > > Date: Fri, 22 Nov 1996 15:37:04 -0500
> > > > From: scottb-at-aca.ca
> > > > To: tesla-at-pupman-dot-com
> > > > Subject: Tapered Secondary Coil
> > > >
> > > > I have seen some secondaries that are tapered, and some that are not. What
> > > > (mathematically) is the difference, and what are the effects??
> > > >
> > > > /sb
> > >
> > > Scott,
> > >
> > > A tapered secondary (with the larger diameter at the bottom) has
> > > decreasing inductance per turn as you go higher up the coil. When used
> > > as a resonator with little or no top-loading (small discharge terminal),
> > > it exhibits a less well-defined resonant frequency (i.e., lower Q) than
> > > a constant diameter resonator. The characteristic impedance of a tapered
> > > resonator also varies with height, being higher Z at the botttom, and
> > > lower at the top. A tapered resonator also has substantially less
> > > "lumped" inductance than one with constant diameter (equal to the base).
> > >
> > > A tapered resonator will see less overall resonant rise than a
> > > constant-diameter resonator of the same height and base-diameter.
> > > However, it should also be less sensitive to detuning from stray
> > > capacitance. Because most of the inductance is concentrated in the lower
> > > half, the voltage stress at the bottom portion is greater than for a
> > > constant diameter coil. Addition of significant top-loading capacitance
> > > should sharpen the tune somewhat, but the resonator will retain its
> > > distributed parameter (transmission-line) characteristics to a greater
> > > degree than a constant diameter resonator.
> > >
> > > There appears to be no marked performance advantage in using a tapered
> > > resonator versus a standard helix in a 2-coil system. However, it sure
> > > looks different...
> > >
> > > Safe coilin' to you!
> > >
> > > -- Bert --
> >
> > Bert and all
> >
> > Has anyone tried to build a tapered resonator and run it upside down,
> > ie., drive the thing at the small end. Couple of interesting
> > observations: the top of the coil is self shielding, no toroid is
> > necessary, the distributed parameters (inductance) may enhance the
> > voltage rise.
> >
> > I will build one if someone can give me a reasonable way to do it.
> >
> > Skip
>
> Skip,
>
> I have wound a couple of conical coils (tapered) and inverted them as
> well. The inversion grossly reduces the coupling in a standard primary.
> (All the inductance and wire is up top!). In general, I found that
> normal conical coils are somewhat disappointing. The self shielding
> aspect of the inverted resonator is quite novel, but the prmary would
> have to be modified to achieve good results.
>
> Richard Hull, TCBOR
Richard
Can you give me a couple of hints as to how you held the wire to the
cone and also what you made the cone from.
Thanks
Skip