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Re: A real quarter wave TC ?



Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Thanks Skip for the update.

Let us know what your up to <grin>. Something a bit different I suspect, but I don't know what it is or why. Wait, never mind. I don't really want to know until you've done it. Often, were too quick to say why something will or will not work. I like it when coilers just go off and do their own thing (it is really the only way to go the distance and gain onhands knowledge that an email or book could never fully translate).

Gerry and I were talking offlist about the resonant cap size. I suspect that you intend to use resonant charging, (why you chose the 35nF size). Just curious if I was right about that. If I was wrong, then Gerry will have some modeled waveforms you would be interested in. As a matter of fact, I'll forward those to you anyway.

Take care,
Bart

Tesla list wrote:

Original poster: Skip Greiner <skipg@xxxxxxxxxxxxxxx>

Hi, again
Yes, the correct value is 35nf. I will be using an 1,800 rpm, 4 pole, SRSG. I made a serious mistake in my first post. My frequency to wavelength conversion was faulty and therefore the secondary calculations were wrong. I have made the necessary new calculations and will probably throw the unit together over the weekend. The primary (with capacitor) and secondary (without a topload) will both be resonant at about 210khz and the wire length of the secondary will be 1/4 wave at 210khz. Will post results, hopefully next week.
Skip

Tesla list wrote:

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Bart,

Did you calculate the resonant C for his NST.  9000V@120ma ??

Unless I made a mistake, I believe it is 35 nf. He is planning on a 35 nf cap using a SRSG (he said 4 pole rotor but didn't say whether he is running at 1800 or 3600 rpm.

Gerry R.

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

The NST will be fine
charging the cap. You could do 120 bps
efficiently and even 240 bps well.