Re: SECONDARY SPACING ??
Subject: Re: SECONDARY SPACING ??
From: mark.graalman-at-mediccom.norden1-dot-com (Mark Graalman)
Date: Fri, 01 Dec 1995 22:22:00 -0500
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Te> That's some good efficiency you're getting there. If I'm not
Te> mistaken, it's close to Richard Hull's magnifiers in that power range.
Te> I'd like to know the particulars of the primary for my records.
Te> Vpri, Cp, Lp, gap type, and rep rate. Thanks a mill.
MG> Hi Mark,
MG> I'm getting about 600-650 watts per foot with Pandora, I'm not sure
MG> but I think Hull's Magi's are doing around 350 watts per foot.
MG> Anyway, the primary is a flat spiral wound with 3/4"OD CATV hardline
MG> with 1/2" between turns, the primary OD is about 30" and its tapped
MG> at about 6 turns, the pri/sec coupling is about .16 (16%).
MG> The primary capacitance is .09 ufd with two homemade flat plate
MG> HDPE capacitors, one is .03 ufd and the other is .06 ufd. The primary
MG> wiring is done with a "homemade" Litz cable made from 15 interwolven
MG> strands of 10 gauge copper wire, the primary inductance is about 18 UH
MG> and the stray inductance in the primary wiring is just about zero.
MG> The spark gap is a rotary, with a wheel diameter of 8" and 8 electrodes
MG> I spin it at 5500 to 6000 RPM for about a 750-800 BPS rate. I also use
MG> two fan blown series gaps in series with the rotary. The primary
MG> voltage at full tilt is about 10KV. The secondary coil is 8 3/4" in dia.
MG> and is wound for a distance of 30" the top 5 turns space wound. The
MG> resonate frequency of the secondary alone is 250KHZ but with the torus
MG> on top it drops to about 130 KHZ and during operation down to about
MG> 115-120 KHZ. The secondary form was prepared with 5 coats of poly before
MG> winding and 7 coats after, the windings are completely imbedded in it.
MG> The secondary inductance is about 25 MH.
... Alias, Mark the spark
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