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Re: Racing Sparks

Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx>

It is possible to get racing sparks without tight coupling. Larry and
I deliberatly made a 1.5 wave coil with a centered primary that had no
top end capacitors. What we found was racing sparks that existed only
at the quarter wave sections at the ends of the coil.(It looked like a
fiery Q-Tip).  When we added secondary capacitance the racing sparks
disapeared.  (Draw your own conclusion!)

I have noticed that tightly coupled coils are fussy about tuning. They
want the primary to be tapped in just the right place, and the spark
gap needs carefull tweaking. Lose coupled coils are more forgiving
about tuning.

Jared Dwarshuis