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*To*: tesla@xxxxxxxxxx*Subject*: Re: Newbie Question*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Sun, 05 Feb 2006 08:14:56 -0700*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Old-return-path*: <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>*Resent-date*: Sun, 5 Feb 2006 14:33:27 -0700 (MST)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <vuTGc_MJXcK.A.KVG.n8m5DB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx> Hi Jay, sorry about the delay in responding, I got caught up in building a ballast for a pole pig...... A quarter wave has a current node by the primary and a voltage node at the very top. A half wave has a current node in the center of the coil with voltage nodes of opposite polarity at each end. An easy way to build a half wave is to wrap 10 lb of 22 gauge on a 10 inch cardboard concrete form. The frequency to drive the tank circuit is simply the speed of light divided by twice the wire length used. (it should be very close to 96,000hz ) To calculate the total top end capacitance measure from the center of the coil to the end and use 45.07 pf per meter height (roughly 30.4pf) and subtract Medhurst self capacitance from the region (about 14pf) This gives us a total top end capacitance of 16.4 pf. Then we know that each capacitor must total 8.2pf. ( a six inch sphere for each side will work nicely, and you can use 3/8 inch copper tube for routing the spheres) A 27 inch to 30 inch diameter solenoid primary will work well ( I prefer 30 inch ) An NST system with a forced air gap is the easiest and cheapest rout for a tank circuit. But solid state would be the first choice if portability was the main concern. Sincerely: Jared Dwarshuis

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