Re: PIRANHA - New Top Load Configuration

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

I cut the top rod down on the gazing ball top load and measured the 
resonant frequency.

http://drsstc.com/~piranha/PIRANHA/PIRANHA-2/TerminalTuning.JPG

http://drsstc.com/~piranha/PIRANHA/PIRANHA-2/TerminalTuning.gif

The chart shows that as I increased the distance of the balls from 
the center, the capacitance increased linearly.  I could go from 28pF 
at 23 inches major diameter to 35pF at 32 inches major 
diameter.  That gives a 98 to 111kHz secondary tuning range.  I will 
try to center the coil at 103kHz primary 105.5kHz secondary.

For background, the balls are 8 inches in diameter and can be slide 
from 11.5 inches to 16 inches outside radius.  Their center line is 
7.125 inches above the top turn of the 6 inch secondary coil.  The 
coil is 73.63mH wound with 1363 turns of #28 and is 20 inches long.

Cheers,

	Terry