Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx> At 08:54 AM 11/27/2005, Tesla list wrote:
Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx> Carlos said: "The 30 kV/cm figure for initial breakdown is valid for at least 300 MHz.(At least, this is what my "Reference Data for Radio Engineers" says.) *Well, my coil resonates at i dont know... My unloaded secondary is 240KHZ. With toroid....i have no clue
It would be a mighty unusual coil to have a resonant frequency that is higher with toroid than without. And if 240 kHz is less than 300 MHz, anything lower than 240 kHz is also less than 300 MHz.
Bear in mind that is for "initial breakdown".. what you see emanating from your topload is usually not "initial breakdown", unless you're doing single shot tests as Dr. R suggested.