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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
There are more types of the "russian caps". There are caps which are used for power HF oscillators, usually have kVARs printed on them, and those caps can take huge RF abuse.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
Dr. Quark wrote ...
No it's not that hard. To a first approximation, take your DC bus voltage, multiply by 4/pi, divide by the square root of 2, multiply by your peak tank current (as measured by fiddling with the OCD, etc) then divide by root 2 again.
Or hook your digital scope up to the coil, multiply voltage and current together, integrate, divide by burst length.
Either way I get about 50kW burst power for my Mjollnir coil. (In its old configuration. I had to lower it for the QCW conversion to avoid overheating, it is now nearer 20kW.)
And from other measurements I know it is at least 65% efficient, not 30.
Where is that math derived from?? Is the derivative of spark length power? I'm just curious
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Hi Dr. Kilovolt I looked up KVAR and found that the formula goes as KVAR=(Kv)squared/1000XC.
maby those other caps are differant but who Knows what the maximum KVAR rating of a cap is unless it is given by the manufacturer. It is also probly based on the disapation factor of any cap or material. I'm shure that mica has a higer disapation factor than the doorknob material but that doesnt mean that you can't use them in sirton applications ass long as they dont excied ther KVAR rating
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QCW coil
