Re: De-tunning or what?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Matt Segal by way of Terry Fritz <twftesla-at-uswest-dot-net>" <segal3-at-linkline-dot-com>

Yea, the problem could be that the static gap is overheating and becoming
more lossy...try blowing a couple of fans over it, or using a compressor. I
don't think it's the chokes, cause then the problem would occur from the
start, and not 5sec into operation. Try the air solution, if it doesn't
disturb the operation of the gap too much.

~Matt Segal
Email - segal3-at-linkline-dot-com
Webpage - http://www.carbonOS-dot-com

---------------------------------------------------------------
I know you believe that you understand what
you think I said, but, I am not sure that you realize
that what you heard is not what I meant.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, April 21, 2001 3:24 PM
Subject: Re: De-tunning or what?


> Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>
>
> Hi Chuck,
>
> Tesla list wrote:
>
> > Original poster: "Charles Hobson by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <charles.a.hobson-at-btinternet-dot-com>
> >
> > Hi all,
> >
> > When I power up my coil (using a NST 10kV/60mA)  I get massive sparks
> into the
> > walls and ceiling which are only about a meter away. The room is not
ideally
> > suited for this so I don't know the maximum possible spark length.
Anyway,
> > after about 5 seconds of power application the sparks wane considerably
> and the
> > safety gap (15mm) takes over. I switch off power for several seconds and
> > re-apply it to get the same big sparks. As I  repeat this process the
> time for
> > the safety gap to take over reduces to about 1 seconds. If I then wait a
> minute
> > or so, the process repeats all over again starting at 5 seconds of power
> > application etc.
> >
> > I thought it was my spark gap crudding up, so I replaced it with my
standby
> > unit. Both are identical static 6 segment multi-gap units. Nothing
changed.
>
> It sounds like the gap to me. You mention it was replaced with an
identical
> gap. It may be in the design and
> therefore exhibiting the same problem. Do you have forced air blowing over
> the gaps? If not, give it a try since
> this is a quick and simple check.
>
> > I am not certain but it appears that the secondary coil is becoming
> de-tuned by
> > something which happens during operation and that the energy released in
the
> > primary (100/sec.) is reflected back to the NST via two 2mH chokes. The
> > operating frequency is 109kHz. That is, primary and secondary coils
> > independently are pre-set to this frequency +/- about 500Hz. The
coupling
> k is
> > 0.19.
>
> Well, I don't know if the chokes are the problem or not, but one easy
> method to find out is to bypass them and run
> without them in the circuit. See what happens.
>
> Good luck,
> Bart A.
>
>
>
>