Re: Q Factor and Overall Efficiency

["Kennan C Herrick" <kcha1-at-juno-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

On Sat, 02 Sep 2000 17:02:11 -0600 "Tesla list" <tesla-at-pupman-dot-com>
writes:
> Original poster: "Ed Phillips" <evp-at-pacbell-dot-net> 
> 
> Tesla list wrote:

<snipped>

 In a 
> real TC
> the secondary Q goes way down as soon as streamers form, so that the
> losses dominate the ultimate voltage in a way which I feel is 
> impossible
> to analyze. 

<snipped>

>...once a discharge starts the secondary voltage
> will not be proportional to the input voltage, but will increase 
> more
> slowly as the input voltage (voltage on the primary capacitor when 
> the
> gap fires) due to the decreasing impedance of the streamers with
> increasing power into them.


I can attest to the above, for sure:  I have a s.s. T.c. which allows me
to view the secondary's voltage rise/fall on the scope.  A beautiful
exponential rise up to the moment when the zap occurs...and then <dump!>
down it goes to 1/4 or less of the max in a very short time--60 us or so
if I remember right.

Unlike in conventional spark-driven coils, my primary excitation is
constant-amplitude, for the 300 us or so needed to build up the voltage
plus another 6 ms or so to fatten the spark.

Ken Herrick
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