Re: Secondary Voltage Measurement with CRO

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

Original poster: "Jon Tebbs by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jgtebbs-at-eos-dot-net>

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>