I like & do this for many reasons. Spark gap across transformer Capacitors
OR MMC on each side 2 that are about the same in series with each side of
the primary. I use a RSPG but will also work fine with a static gap too. be
sure you have enough turns of wire to block anything going back to your
NSTs. this is where my wires are longer 10 feet from the 3 NST to spark gap
then you should have as short as possible.& low resistance, inductance to
your circuit from spark gap to cap or caps to primary i use 14 copper tube
or ground strap about 3/4 inch wide. 1.250 by .031 Ribbon for my primary
14.5 by 23.5 about 11 turns you also need a GOOD GROUND just for your
secondary end RF high voltage only & safety gap. use another ground for
the rest not the RF. I use a 8 foot long 5/8 diameter copper clad in the
dirt about 15 feet away. your primary coupling & design are very important
to success..
On Fri, Oct 11, 2019 at 2:14 PM jimlux <jimlux@xxxxxxxxxxxxx> wrote:
> On 10/10/19 6:52 PM, Tedd Dillard wrote:
> > Ritchie Burnett covers all of the fundamentals on his site.
> >
> > On Oct 10, 2019 6:18 PM, "undisclosed recipient via Tesla" <
> tesla@xxxxxxxxxx>
> > wrote:
> >
> >> OK… lil footnote for the newbies…
> >>
> >> Keep the spark gap as close to the MMC and the primary as possible,
> >> especially when the high voltage power supply is a few meters away.
> >> Reason being is the spark gap sets the frequency for the primary.
> >> A wire produces higher resistance at higher frequencies and the longer
> the
> >> wire between the spark gap and the primary, is like putting a huge
> resistor
> >> in the line.
> >>
> >> Getting stumped by stupid things like this is the reciprocal of no sleep
> >> and and multiple halloween props to repair.
> >>
> >>
>
> I don't know that AC resistance is the issue here. It's more like the
> inductance in the long wires detunes the LC - and if they have a lot of
> parasitic C to somewhere (i.e. the floor) then there will be some loss.
>
> As I understand it, youve got NST, RSG, Cap, and Primary L in parallel?
> That's not the usual configuration, although it might work.
>
> Normally, where the spark gap, primary capacitor and primary inductor
> are in series - When the gap fires, it connects a charged capacitor to
> the inductor, and the circuit rings until the gap quenches and opens the
> circuit.
> There's several choices for how to "charge" the capacitor. One is to put
> the transformer in parallel with the gap in the series gap,cap,pri
> combination. When the gap is "open" - the cap charges through the
> primary, which is fine - the charging is at 50/60 Hz, so the primary
> inductance is negligible influence.
>
> There's another scheme where the transformer is connected directly
> across the capacitor (this is more similar to how a DC charging system
> works) - The idea here is that when the gap fires, the NST sees the RF
> across the cap which may or may not be a great idea (in the NST across
> the gap scheme, the gap shorts the NST out and shunts most of the RF).
>
>
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