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Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
As I contemplate a new mini coil, I am wondering about frequency in the design...
Most specifically, when designing a low power NST driven SGTC (say, 3500V-7500V, 30mA), is there a target range of frequency for the secondary that will perform "better" than others with longer and stronger streamers (all other things being equal and tuned respectively)?
I have also seen mention in searches here about folks seeing more sword-like streamers above 500KHz, and more branching at lower frequencies...which ultimately winds up being longer, and is there a range which optimally encourages one type or the other?
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
They say that somewhere between 300 and 400 kHz lay the magic frequency for "swords," but usually that's in reference to solid state or vacuum tube coils, so I'm not sure if a conventional NST-driven SGTC RF envelope's highly disrupted nature will apply to it.
Steve Ward and his quasi-cw drsstc running at 350kHz:
Registered Member #3075
Joined: Fri Aug 06 2010, 02:44PM
Location: Athens, GA
Posts: 148
My goal is to find whether or not there is a "better" frequency for a given power range/coil size when going for certain characteristics.
Let's say I want thick, branching streamers that go as long as possible (as opposed to swords), is there a way to determine the best frequency range for that, or is it really just a matter of tuning?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I'd say that generally lower frequency produces longer but less hot streamers for the same power, but from my experience a too low frequency with not enough power results in less "concentrated" more branchy streamers which more resemble a brush discharge. But then I mostly play with continuous wave coils (SSTC/VTTC)...
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Frequency, design and the effect on the streamers?
