Re: Ratory gap with NST ?

[Terry Fritz <twftesla-at-uswest-dot-net>]

Hi Tom,

If you have an NST with a resonant size cap, the voltage will hit about 80,000
volts plus unless the gap fires.  Static gaps are "always there" to fire when
the proper voltage is reached.  However, the gaps in a rotary my not be there
at the right time and the sudden voltage build up may not be stopped in time. 
Simply putting a typical static gap in parallel with the rotary with the gaps
set a "little" further apart will insure that the gap always fires somehow if
the voltage starts to gets too high.  Protection filters like the one below
will easily protect against this too.

http://1071737050/site/misc/NSTFilt.jpg

Cheers,

        Terry



At 11:55 AM 8/19/00 +0200, you wrote: 
>
> Hi all
> I've heard that it's a problem to run a rotary gap with a NST.It'll burn out
> or something similar.If that's true,I have a real problem,since I get easily
> NSTs but hardly other suitable HV devices
>  
> Tom
>