Re: Malcolm Watts' comments on my t.c. comments
> Original Poster: Kennan C Herrick <kcha1-at-juno-dot-com>
> Malcolm Watts' points as to Q and structural capacitance are well
> taken. The more energy going out to radiation, the lower the Q: seems
> as if that ought to be the case. As to capacitance, perhaps t.c.-ers
> ought to contrive to wind their coils with as high a distributed
> capacitance as possible, the better to soak up energy before the big
I think one should generally aim for the lowest distributed
capacitance in the coil with the bulk of the capacitance in the
topload. That way, most of the energy at ringup completion resides
in the topload with little impediment to allowing a rapid heavy
discharge, a bit like lightning. There appears to be a distinct
difference in the way these two types of coils operate:
The high structural capacitance with relatively low-C topload forms
purplish streamers easily while the relatively high Ctop type
produces fewer of these and less easily but when fed with enough
energy, connects to targets with a white hot discharge. This is what
I've observed in operation. Type 1 is great for a little tabletop toy
coil but type 2 is serious coiling stuff.
I remember Richard Hull describing this sort of phenomenon with
respect to one of his coils. He more-or-less said that up to 7kW, the
coil in question produced a few purple streamers of several feet or
so but on adding one more kW, "suddenly the 8-footers were there".
Anybody else have a comment on this?