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Re: Practical conductor distance from Rotary Gap to cap bank and Primary

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Jim,

I'm not sure I understand why you want to place your rotary gap
12 ft from the other tank circuit components?? I can tell you how
I run the transmission lines from my transformer to my coil tank
circuit assembly. With my 15 kVA pole pig driven coil I run (2)
60 ft lengths of 75 kV rated HV x-ray cables from the 2 HV bushings
of the pig to the coil. I leave both of the leads ungrounded and do
ground the outer metal ground sheathing of the cables. I also run
the 120 VAC line for the ARSG and cooling fan from the control
panel via Romex armored 14-3 wire with the outer armored grounded.
Both of these grounds are mains 60 hz ground. This armored cable
is 50 ft. long. These lengths allow me to move the coil down the
driveway far enough away from my house that  I don't fry all of the
sensitive electronics in my house. :^) When I tried firing this coil w/in
15 ft. of the house and garage, it caused all kinds of problems, but
when I moved the RF grounds and the coil out 40 ft or so from the
garage and house, these problems vanished. The only interference
problem that still persist is that if someone in the house is on the cord-
less phone, it does cause some static.

David


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, August 09, 2005 5:03 PM
Subject: Practical conductor distance from Rotary Gap to cap bank and Primary


Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hello all,

I have been building a permanent TC setup in my back yard. It is working out very nicely. I truly have "a Firm Grip on the Earth" for the RF Ground, 240V 60 amps dedicated from my chair on the deck, and extensive EMI/RFI filtering as I have two 7' racks of electronics and computer stuff in the house. All my neighbors have PC's, so over kill was in order.

I have a clean sine wave in the house experimenting with my 15/120 8" coil with a 32X8" Toroid and 4 inch corona ring with nice sparks and a breakout.(Blown R Quick 1 inch (2) brass dowel gap).

Ideally, I would like to move my rotary 12 feet away from my primary and cap bank next to my pig and developing DC coil components cabinet. I realize the inductance loss of the round trip and tuning issues but am willing to find Utility Company very heavy gauge HV direct burial or down the pole wiring to keep the R component very low in the Impedance and RF loss. This would position the components further from the house, and provide safety from conservation of angular flying nuts and bolts as well.

I know virtually squat about transmission line theory or line capacitive reflections which must be important to the aforementioned Z.

It would then be a simple and light matter of moving the coil into the shed when the rains come. I have a heavy rotary and dc motor and mounting plate. I'll be bringing a web site up shortly with pictures.

Has anyone had any success in a reasonably separated rotary scenario? If this is impractical please respond with educational pitfalls.

Thanks much,
Jim Mora