Re: Tuning Observations

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Wednesday, July 23, 1997 2:54 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Tuning Observations

Hello Julian,

> From:   Julian Green[SMTP:julian-at-kbss.bt.co.uk]
> Sent:   Tuesday, July 22, 1997 11:51 AM
> To:     tesla-at-pupman-dot-com
> Subject:    Tuning Observations
> Has anyone noticed that the tune a coil is affected by spark length?

> I noticed this effect when tuning my coil at very low power where adjustments
> on the primary tap are extreemly sensetive.   (By low power I mean output 
> spark of 2".)
> Has the power of the coil is increased and output spark length increases to a
> point where the coil goes out of tune and spark length does not increase as 
> power increases.   Adding an extra turn of primary corrects the problem.
> I also notice that this effect is greater with a small toroid.
> The conclusion I have drawn from my observation is that as a streamer emits
> from the toroid it is in effect adding to the conductive surface area of the
> toroid and hence increases capacitance of the toroid.   Perhaps the ion cloud
> also effects the capacitance of the toroid and hence tuning.

Your musings are absolutely correct. You might call it parametric 
tuning :)

> Therefore use a larger toroid so these effects are minimized.

Reduced as you say.