Re: resonant freq.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Sean Taylor by way of Terry Fritz <twftesla-at-qwest-dot-net>" <taylorss-at-rose-hulman.edu>

> No, nothing wrong.  Your technique is another valid and clever way of
doing
> it.  We just always used the "antenna" approach and it seems to work well
> for us.

Ok, I thought it would work. . . does the antenna throw off the tuning of
the coil? I guess it wouldn't anymore than being within a couple feet of the
coil would . . .

Sean


>
> Best regards,
>
> Dr. Resonance
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Wednesday, July 10, 2002 5:47 PM
> Subject: Re: resonant freq.
>
>
> > Original poster: "Sean Taylor by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> <taylorss-at-rose-hulman.edu>
> >
> > Is there something wrong with this method:
> >
> > Inject a signal into the bottom of the secondary through a 1 KOhm
> > (about) resistor, and monitor the voltage at the bottom of the
> > secondary (after the resistor).  When this voltage goes to a minimum,
> > you have reached resonance, in other words, the voltage across the
> > resistor is at a maximum, thus current is at a maximum.  Am I missing
> > something here?  Thanks,
> > Sean Taylor
> >
> >
> >
> > -------------------
> > > Original poster: "Malcolm Watts by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
> > >
> > > Hi D.C.,
> > >
> > > On 7 Jul 2002, at 12:49, Tesla list wrote:
> > >
> > > > Original poster: "D.C. Cox by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>"
> > > <DR.RESONANCE-at-next-wave-dot-net>
> > > >
> > > >
> > > > Inject a signal into the bottom of the secondary coil and then,
> > using a
> > > > scope probe, hold a small 4-5" long piece of wire near the top of
> > the coil's
> > > > toroid --- 1-2 in. away but NOT TOUCHING the sec. coil  This
> > antenna will
> > > > pick up the signal and give you the resonant freq on the scope.
> > You could
> > > > also just use a 5 meg resistor between the scope probe and the
> > toroid.
> > > >
> > > > The lowest freq you can find will be the resonance point.
> > >
> > > I'd say that a couple of inches away from the terminal is far too
> > > close to give an *accurate* figure (unless the coil is going to be
> > > that close to something else while running) and 5MOhms is too much
> > > loading. I suppose it depends how accurate you want to be. I
> > normally
> > > won't have a probe closer than 3 feet (or more if I can get a
> > > readable signal).
> > >
> > > Regards,
> > > malcolm
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
>
>
>