both coils should be tuned to the same frequency. You'll know when
it's right because you'll get the longest output sparks. For certain types
of research work, the coils are tuned to harmonics to obtain a higher
absolute voltage, but overall efficiency is lower, and the sparks will be
shorter, since spark lengths depend on both voltage and power.
Safe coiling, John Freau
In a message dated 99-01-10 21:11:16 EST, you write:
> Being new at tesla coils I have a basic question. Should the
> frequencies at which your primary and secondary coils operate be
> harmonics? I assume that this is what is happening when people speak of
> adjusting the primary coil with some sort of adjustable tap. The power
> transfer should be greatest when the secondary is operating at a
> harmonic of the primary coil frequency.