Re: Tuning Observations "parasitic tuning"

From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: 	Friday, July 25, 1997 1:06 AM
To: 	Tesla List
Subject: 	Re: Tuning Observations "parasitic tuning"

William Noble wrote:

> wouldn't this effect then suggest that for big coils you want to dynamically
> tune the coil while it is running - once the streamer reaches a certain length
> the coil should be retuned (with the streamer formed) to keep it growing????
> I'll bet that a longer streamer would result.  this is of course an
> interesting electromechanical design problem (and not one I need to tackle for
> my baby coil that I don't have time to play with)

My coil has a remote tuning mechanism (Litz tuner) for adjusting Fpri by
about +/- 5%.  During operation, I have never noticed any significant change
when running the tuner from one end to the other.  One reason is that small
changes are hard to see when the arc is flying around, but the main reason
is probably that the loaded Q is so low with a big white arc hanging off the
top electrode, that the tuning is not all that sharp.