Re: Terry Filter Tuning

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Original poster: "resonance" <resonance@xxxxxxxxxxxx>



Best way to reduce it is eliminate most of it with a SISG solid state 
spark gap.  Less heat so the normal spark gap electrodes do not get 
red hot and fail to quench.  Efficiency increases substantially, 
usually 50% longer sparks per kVA of input power than classic air 
type gaps.  Typical with air gap is around 1 ft per 1 kVA while with 
solid state SISG design approx 450 Watts per ft of spark for coils 
with total spark outputs under 4-5 feet.

With nsts a good parallel tube gap with forced air fan works 
good.  Above 4 kVA just go to a nice rotary.

It varies a lot from coil to coil depending on the design.  One 
tip:  Using a larger dia sec coil soaks up a lot more energy than a 
small 2-3 inch dia sec, so less problems as the coil dia. 
increases.  I have some data on this but it's all back in files in WI 
and I don't have access to it.  Mom would never find it!!!

Dr. Resonance


> Reading these posts about the Terrry Filter brought a question to 
> mind. Has anyone measured/monitored the energy reflected back from 
> the tank circuit?  And assuming it is wasted done some tuning to 
> reduce that reflected energy?
> Russell T.