Hi Stan,Yes, everyone runs into different experiences with coupling and their own ideas of how close is too close, how far away is too far away. When it comes to pri to sec clearance, the voltage on the inner turn of the primary is one issue to deal with. The mutual inductance is the other. Javatc will look at the voltage on the primary, the radius of the primary tubing, and will also look at the coupling as based on the mutual inductance. It will give an estimate of the "minimum" distance to the coil and also a recommended coupling coefficient. If you find your coupling is higher than the recommendation, then the secondary needs to be raised above the primary. You can also insert a "desired" coupling value and run the program. Javatc will then lower the primary until that value is achieved. You will find then that the primary inner and outer heights have been changed. You can then easily look at the difference between the primary and secondary heights to find the difference needed to achieve a particular coupling value.
But this is still only a recommended starting point. You should then physically test the coil at this level, and then raise AND lower the coupling in 1/4" increments to find the "best" happy spot as determined by the way your coil runs and by the spark lengths it produces.
Take care, Bart stanley miller wrote:
Ok, so i'm told a little lower and a little higher by someone else so I guess the main thing is having it set up where it is easily adjusted. And by a little bit do you mean a quarter inch below the first turn or more?
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