Re: Primary Tune Found

In a message dated 96-08-14 04:52:16 EDT, you write:

 Hello All:
 	Since I'm on vacation I have had some more time to keep working on my
 coil tuning.  Last night I believe I have succeeded in finding the
 primary tap point that works the best.  I used the signal generator and
 scope and just for fun checked resonance every 1/4 --guess I had too
 much free time available!  My spark wasn't real long Sunday night but
 now with the secondary showing 102 Khz and the primary 95 Khz on Monday
 night things were really neat.  Power draw dropped while the spark
 length really has started to grow in size, apparent power and length. 
 All I had done on Sunday was pop a 1 amp quick blow fuse in the control
 circuit, no damage found anywhere else.  Hey, a bigger fuse and away I
 	I'm running just the welder in series with my pole pig for current
 limiting, with no oven elements currently included.  Today I hope to
 re-read some of my saved postings on the advantages realized when using
 the oven elements in parallel with the welder.  I could probably cook a
 snack too?  I had a second used digital meter I put in to replace the
 blown one that I was using for voltage to the pole pig primary.  Even
 with additional by-pass features and the original 30 amp RF filter too,
 I blew the second one in about 6 minutes of running.  I think I have
 clearly proven that digital meters, even if free, are a very poor choice
 in Tesla work!  
 	One interesting item that I noticed last night.  I am using RG-213 for
 my high voltage leads from the pig to the spark gap.  At the spark gap I
 have taken the grounding braid or outer conductor from both leads and
 soldered both to a 1 1/2" braided copper ground strap.  This strap is
 then connected directly to my system ground and is about 8' long.  The
 RG-213 is 30' long and is then connected to my filter board at the pole
 pig.  O.K., what I did was strip back and had about 12" of the coax
 ground braid laying out from each high voltage lead and the two ground
 braids were laying against each other, but not connected to anything.  I
 figured since the other end was clearly tied to ground, why do it
 again.  The majority of the 12" was laying on the driveway.  These two
 ground leads were arcing, one to the other, with about a 1/2" diameter
 ball of blue light.  No noise was heard and no damage detected, but it
 was a surprise.  
 	Performance is really neat right now but still alot to learn and do.  I
 had several neighbors over again and I have taken steps to totally
 protect them from the system.  Sparks appear to be approaching 7 feet
 now and are very frequent and last.  The strike rail isn't getting hit
 real often, which is nice.  The 48" toroid seems to have the sparks
 going out in a horizontal manner about 60-70% of the time.  All sparks
 came from one spot at first.  I stopped things asnd we found a "sliver"
 of aluminum tape that was sticking out about 1".  After removing it the
 entire toroid O.D. got active and the sparks somewhat bigger too. 
 Enough for now--any comments or recommendations would be appreciated.
 Chuck Curran >>


Sounds like you're having fun.  This is what it's all about.  All those long
hours of design and construction pay off in long sparks.  I also use RG213 to
deliver power to the coil from the pole pig.  I have both shields tied
together at the coil and connected to the main RF ground.  The other ends are
tied together at the filter board, providing the ground to the safety gap.

Ed Sonderman