RE: [TCML] VTTC Coupling

["S&JY" <youngs@xxxxxxxxx>]

I am wondering if the effect of moving the feedback coil up the secondary is
equivalent to introducing some phase shift between primary and feedback
coil.  If so, perhaps the feedback coil could be located in a more
reasonable lower position, and a phase shift network could be used to
achieve the same result?  It would be a good experiment to try.

--Steve Y.

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of dr.hankenstein@xxxxxxxxxxxxx
Sent: Tuesday, September 16, 2008 6:06 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] VTTC Coupling

I used to run the feedback coil underneath the primary on my small 811A
coils. Dr. Spark built a twin 833C coil several years ago, which Cameron
later used as a reference for his coil and research, and placed his feedback
coil higher up on the secondary. I duplicated Chris's coil in this respect
and have found out that there is a sweet spot for the feedback coil which
results in much longer sparks. Chris definitly has the knack for tuning a
833C VTTC. I would recommened his work, which can be found on his website! 

Woo


> [Original Message]
> From: Phillip Slawinski <pslawinski@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Date: 9/15/2008 3:53:41 PM
> Subject: Re: [TCML] VTTC Coupling
>
> Cameron can run the coil in continuous mode too.  His coil draws around
20A
> at full power.  He told me that he runs the feedback so high up so that
it's
> the secondary that drives it.  At any rate he got the largest spark while
> the coil was high up on the form.
>
> On Mon, Sep 15, 2008 at 5:32 PM, <futuret@xxxxxxx> wrote:
>
> > Hi Dr. R,
> >
> > My coupling was rather low on that coil at around 0.16 or 0.18
> > I think.  I did some work at k = 0.35 but it was probably actually
> > k = 0.30 or so.  At that point a giant flashover occured and
> > destroyed the primary and seconday.  Cameron Prince uses
> > the raised grid coil.  He's applying so much peak power to the system,
> > that he can only run it in staccato I believe.  The extra high
> > voltage he's using may be changing things in some way, I don't
> > know.  I'm not really sure what's happening in his coil to
> > explain the high grid coil.  I've never heard of anyone
> > else using such a high position for the grid coil.  OT: Nice
> > stock market action lately !
> >
> > Cheers,
> > John
> > ----------
> >
> >
> > -----Original Message-----
> > From: DC Cox <resonance@xxxxxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Mon, 15 Sep 2008 6:04 pm
> > Subject: Re: [TCML] VTTC Coupling
> >
> >
> >
> > John:
> >
> > What coupling k value have you measured on your 833 coil?  I would guess
> > around 0.2 ???
> >
> > What is possible before destruction begins?
> >
> > I've read one person has his grid feedback coil nearly 40% up the height
of
> > the sec coil.  And he's getting very good outputs.
> >
> > Dr. Resonance
> >
> >
> >
> >
> > On Mon, Sep 15, 2008 at 3:34 PM, <futuret@xxxxxxx> wrote:
> >
> >  I don't think it would work well.
> >>
> >> John
> >> -------
> >>
> >>
> >> -----Original Message-----
> >> From: Phillip Slawinski <pslawinski@xxxxxxxxx>
> >> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> >> Sent: Mon, 15 Sep 2008 3:50 pm
> >> Subject: [TCML] VTTC Coupling
> >>
> >>
> >>
> >> Is it possible to over couple a VTTC?  I have a 3.5" secondary, and I
> >>
> > have
> >
> >> a
> >> 4.5" form that I could use for  my primary.  If I used the 4.5" form
> >>
> > would
> >
> >> this be taking things a little too far?  Would there be any real
> >>
> > benefit to
> >
> >> doing this?
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