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RE: Sync RSG instability

Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Gary.Lau-at-compaq-dot-com>

Hi John:

That's somewhat reassuring that I've not got some unique problem going
on with my SRSG.  But I've always been under the apparently false notion
that one can simply tweak the timing back and forth with abandon to find
the sweetest setting.  Too bad real circuits are not as well-behaved as
MicroSim models!  Knowing that the phase will suddenly go 90 degrees out
of whack if I advance it just beyond the sweet spot kind of puts a
damper on the desire to tweak. Guess I better get that safety gap set
right ;-)   I'm surprised this has not been more widely reported and
discussed.  I wonder if the degree of cap "LTR-ness" affects this?

Regards, Gary

>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
>I've seen that behaviour, and I remember John Morawa saw it too.
>It may have been discussed on the list, it seems that at some
>point as the phase is changed, the NST goes into a new mode,
>due to the way energy is stored in the NST.  I'm always careful
>to set my sync gap phase, a little distance away from this spot.
>John Freau

>> Original poster: "Lau, Gary by way of Terry Fritz
>>  I'm slowly working on getting my sync RSG ready. 
>>  BUT, when I advance my RSG timing to fire any later than slightly
>>  the peak charging voltage, the gap stops firing, the charging
>>  waveform changes to a full 35KV (!!!!) sinusoid, and the phase of
>>  waveform shifts by 90 degrees, such that the zero-crossings are now
>>  occurring at the gap presentations, which is why the gap doesn't
>>  If I retard the timing, it will again resume normal firings.
>>  Has anyone
>>  else seen this behavior?
>>  Gary Lau
>>  MA, USA