Re: Secondary Voltage Measurement with CRO

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

Original poster: "tesla by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla-at-paradise-dot-net.nz>

Tnx for observation
Yes am running inductors in the primary (one in each lead made from"EE"
cores) they are 3mH each so a resonance with the primary at 3.5MHz is not
likely.

Tests were short due enviroment here (Motel complete with kids, cats and
guests) Fo signal was swampped by that 3.5MHz signal. Will try again in next
weeks to confirm and will use better sense antenna.
Rgds to all
Ted L
>
> Hi Ted,
>
> Very interesting that the 3.5 MHz signal is only present while the coil
> is running. Are you by chance using chokes in the primary supply? If so,
> does their inductance and the tank capacitance calculate out to this
frequency?
>
> How does the amplitude of this parasitic compare to the fundamental at
> 95 KHz? Is the parasitic Fo sensitive to probe placement?
>
> Another thought, with the scope probe and foil it seems your trying to
> approximate Terry Fritz's plane wave antenna. If the probe is
> responsible for the resonance, you might try a swamping load resistor
> across the probe.
>
> I plan to build a plane wave antenna myself in the near future, time
> permitting.
>
> Keep us informed on this.
>
> Tesla list wrote:
> >
> > Original poster: "tesla by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <tesla-at-paradise-dot-net.nz>
> >
> > Hi
> > CSC in NZ is 4.43MHz, the signal I was observing was from the tesla as
it
> > was only present when the tesla was run. I think what I may be seeing is
a
> > parasitic resonance enhanced by a rising freq response from the
measurment
> > method.
> > Tnx for thoughts
> > Best
> > Ted L
> > Subject: Re: Secondary Voltage Measurement with CRO
>
> snip
> --
> Jon G. Tebbs
> <jgtebbs-at-eos-dot-net>
>
>
>
>