Re: rotary spark gap

In a message dated 99-12-28 21:47:44 EST, you write:

<< Original Poster: Thomas Gstrein <thomas.gstrein-at-stwimst.at> 
> Hello. Can I use a rotary spark gap with a NST?

The basic rule is:   Only a synchonous rotary can be used.  Non-
sync rotaries tend to destroy the NST's.  You can modify an induction
motor to make it synchonous, by grinding flats on the armature.  BUT
if you do use a sync rotary, the capacitor must be the *correct* size
for the system.  If you take a coil that is optimized for a static gap
and simply install the sync rotary, it *may* give shorter sparks.
Generally 120 bps is used, but 240 bps can be used, if you have
enough NST power, and if the cap is the correct size, etc.

Millennium Synchros,
John Freau