Small Coil Questions
I have a couple of questions about my new small coil. Again, it is 3.0" dia
x 13.0" winding length - about 917 turns of #28 wire wound on acrylic form.
Primary is flat, 14 turns of #10 solid copper wire. Spark gap is the
standard cylindrical with 6 gaps of .028. Power is one 12 kv 30 ma neon.
I am only getting about 11.0" of spark to a grounded wire. Is this less than
it should be?
On the safety gaps, I have them set to .34" on each side with a grounded
contact in the center. They fire very regularly at this distance. I would
like to open them up some more so they only fire infrequently. Am I likely
to damage the transformer? I have a 3,000 ohm resistor and a 1 mh choke in
series with each H.V. lead from the transformer. On my larger 6.0" coil
fired with a 14.4 kv pole pig, I have the safety gaps set at .50" on each
side and they seldom fire.
Another question is tuning and Q. This is a very clean construction with all
acrylic materials, rolled poly cap, etc. I expected the tune to be very
sharp but in actuality it doesn't seem to be. The best tune is 13 turns,
which is about what I calculate. Turn 13 is defintlely better than turn 12
or 14 but I can't really tell much difference between say turn 12.5 and
13.5. Is this normal?? I have the same problem with the 6.0" dia coil.
Thanks, Ed Sonderman