Re: reason for rf chokes?

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

Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>


> This spike returns to 
> the choke, which dampens the spike.  The choke is
> essentially transparent at 
> 60hz, but highly resistive to the 200khz signal.
> 
> larry.
> 
> 

Hi Larry,

Chokes alone are of questionable value in the NST
filter role. A hi-Q airwound or ferrite core choke
could, at least in theory, "ring up" to high
potential, exactly like a baby Tesla coil, possibly
doing more harm than good to your NST. Unless you have
the ability to verify the lo-pass performance of your
chokes throgh actual test & measurement, or at least
the ability to computer model & analyze the chokes in
your TC system, you are really just taking a shot in
the dark.

As part of an LC lo-pass network, the chokes would
have a better chance of providing useful filtering.
Better yet would be an RC lo-pass filter with robust
ceramic power resistors in place of the chokes, and HV
caps to ground. Such a circuit is more predictable and
practically immune to "ringing"

My .02$ worth,



=====
Gregory R. Hunter

http://hot-streamer-dot-com/greg

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