Re: counterpoise Success

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Black Moon by way of Terry Fritz <twftesla-at-qwest-dot-net>" <black_moons-at-hotmail-dot-com>


Well, it also could be due to the fact pvc is wayy better then cardboard :) 
and your aspect ratio was way off befor.





>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: counterpoise Success
>Date: Mon, 28 Oct 2002 11:51:06 -0700
>
>Original poster: "J Dow by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><jdowphotography-at-hotmail-dot-com>
>
>
>
>
>Hello all
>
>I was asking about using a large metal table (4’-20’) as a counterpoise.
>The general consensus was that it would work. I ran the coil with the table
>Friday and it was a major rock’n ark’n spark’n zap’n snap’n deal! My coil
>put out some fine 5-foot streamers, very nice
>
>Coil specs:
>Power transformers:
>2, 12kv/60ma NST’s banked for 120ma with PFC capacitor to smooth out the
>current draw. On the HV side of the transformers is a serge filter good to
>240ma 15kv to protect the transformers from over voltage (a Terry filter).
>Control cabinet:
>Two arming switches for mane coil power feed. A “dead-man” switch controls
>power out to the coil through a 15 amp variac. The coil is fused to 15 amp
>with a 15amp fast blow fuse.
>
>My secondary:
>It used to be this-
>(10.5” cardboard concrete poring form, coil form.
>36.5” winding 22awg
>2, ¼” lexan disks inside the coil (inner arc prevention) at equal spacing.
>Separating the inside of the coil onto 3 equal segments.
>The coil was pre-coated with poly, inside and out and plenty after winding.
>)
>This burnt up. The coil form moved around on me causing shorted (overlapped)
>turns.
>I’ve made a new secondary. 4” pvc 1/8th wall thickness. 36” tall 35” winding
>half inch space at both ends of the coil. 1750 turns 24 awg.
>
>This coil is SO good; I don’t think I’ll ever make a 10” diameter coil
>again. It does need a Big top load though. L
>
>Pri: Was a flat 20 turns ¼ cu tube now it’s 12 turns 30-degree platter coil
>for the smaller secondary. This also works like a charm.
>Spark gap: SRSG 120BPS It consists of a small 1/25 hp 1800rpm motor that
>spins a Plexiglas disk with 4 electrodes.
>Capacitor:
>16kv -at- 0.0692uf  “MMC Geek cap”. This is an array of 36 Cornell Dubilier
>capacitors. Each cap is rated for 2000V -at- .15uF there are 4 springs with 9
>capacitors each.
>
>Smaller is better!!!
>Halloween is gona be so cool I don’t know what to do
>
>Read you all later
>Josh
>