Re: School demo

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Well.. there is that, too...
The only thing to watch out for is if your flat spiral primary acts as a
good counterplane, then a signficant amount of RF might be coupled via the
path top of secondary thru C(topload to primary), through the transformer to
RF ground, to counterpoise, to bottom of secondary.
I've been doing some back of the envelope analysis, and I think that's the
RF through the NST killer path, since the NST has that grounded center tap,
and a fairly high secondary impedance.

> >
> > The chicken wire thing works great for an RF ground. It's close to the
> > coil, low impedance connection, etc.  You should ALSO ground it to the
> > green wire ground for safety (in case, for instance, you get a short to
the
> > RF ground from the HV secondary or the line voltage.  That ground
> > connection could be fairly high impedance (like, it could go through a
> > choke, if you are worried about feeding RF back into the building
wiring).
>
> I'd rather have a solid ground to keep the primary transformer from
> feeding HVAC through me!!!
>
> Ed
>
>
>