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Re: A real quarter wave TC ?



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

Hi Skip,

The line resonant cap for your transformer is 35 nf. If you operate at resonance with a SRSG, bad things will happen to your NST and Caps. For SRSG at 120BPS you will need around 2.8 * Cres (99 nf for your case). This is to make the charging work without getting excessive voltage on the TC primary (independent of the TC primary and secondary design). Needed Cp value is a function of your power source, spark gap type, and presentation rate in case of SRSG.

With a 99nf tank cap. and a two turn TC primary, you will need to make sure your surge current is not too high for your MMC. Ipeak and Irms are also important design factors for a reliable MMC.

Ip_max = Vp_fire / sqrt (Lp/Cp)

If this is a problem area and you need to add more primary turns and lower the resonant frequency even more, you can add a top load and/or add more turns onto the secondary.

I dont know what your objectives are for such a high frequency and low number of secondary turns given the large diameters of the coils, but if those parameters are important, you may need to reduce your power levels.

Gerry R.


Original poster: Skip Greiner <skipg@xxxxxxxxxxxxxxx>

Hi All
I am considering building a TC with the following specs and would appreciate any comments

Secondary: 83 turns #16 ga wire on a 45" diameter by 24" high form
Primary: 2 turns of .375 copper tubing about 50" in diameter
NST: 9000@120 ma
Cap: .035

Units??? I assumed you meant 0.035 uf


Synchronous 4 pole RSG
Note that both primary and secondary are resonant at about 250khz. The secondary will not have a top load.
Thanks in advance for all comments
Skip