From: FutureT@aol.com
Date: Sat, 18 May 2002 12:49:48 EDT
Subject: Re: [TSSP] Topload breakout potentials
--part1_175.8763639.2a17e02c_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 5/18/02 3:31:02 AM Eastern Daylight Time, tesla123@pacbell.net writes: response and new test and calcs, > > >> It would be interesting if Bart would run his coil at a lower power, >> so that he gets just one streamer, then tune to make that >> streamer as long as possible, then see if it "scales" with my >> TT-42; same freq offset, same ratio of top volts to toroid breakout >> voltage >> stress, etc. This may be especially meaningful if he is also >> using 120 bps, as I am. > Yes, I'll do this and at 120 bps. Bart, Paul, all, I did a new test using the 6" x 24" toroid, and tuned outwards at 21.7 turns, there was no breakout even with a breakout point, and no racing sparks. I suppose the coupling is lower though. The TT-42 with the smaller toroid needs a larger freq tuning offset. This makes sense, because the the frequency will shift more when the total Csec+top is smaller for a given spark length. Since a larger toroid for a given spark length requires less mistuning, this should give a theoretical efficiency advantage, during pre-breakout, and during pre-full streamer length times, I would think. This may be one of the benefits of using a larger toroid in general. > >> I wonder if I'd see much difference if I tune at 1/2 turn intervals, >> instead of only at 1 turn intervals as I'm presently doing? > You may or may not. It's a 50-50 shot, but it would be good to know for > sure. John, regarding your measurements for examining how fast the gap > quenched, what method did you use to scope this out? Off tssp may be > appropriate as it's a side question. I'll have to cut away some insulation for the 1/2 turn positions and try that. If I find a better tune position, some of the frequencies above may change. To scope out the quench-times, I just pick up the secondary waveform with an antenna, and I observe on the scope display, where the secondary free-ringdown begins. Cheers, John > Take care, > Bart --part1_175.8763639.2a17e02c_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 5/18/02 3:31:02 AM Eastern Daylight Time, tesla123@pacbell.net writes:
response and new test and calcs,
It would be interesting if Bart would run his coil at a lower power,
so that he gets just one streamer, then tune to make that
streamer as long as possible, then see if it "scales" with my
TT-42; same freq offset, same ratio of top volts to toroid breakout voltage
stress, etc. This may be especially meaningful if he is also
using 120 bps, as I am.
Yes, I'll do this and at 120 bps.
Bart, Paul, all,
I did a new test using the 6" x 24" toroid, and tuned outwards
at 21.7 turns, there was no breakout even with a breakout point,
and no racing sparks. I suppose the coupling is lower though.
The TT-42 with the smaller toroid needs a larger freq tuning
offset. This makes sense, because the the frequency will
shift more when the total Csec+top is smaller for a given
spark length.
Since a larger toroid for a given spark length requires less
mistuning, this should give a theoretical efficiency advantage,
during pre-breakout, and during pre-full streamer length times,
I would think. This may be one of the benefits of using a
larger toroid in general.
I wonder if I'd see much difference if I tune at 1/2 turn intervals,
instead of only at 1 turn intervals as I'm presently doing?
You may or may not. It's a 50-50 shot, but it would be good to know for sure. John, regarding your measurements for examining how fast the gap quenched, what method did you use to scope this out? Off tssp may be appropriate as it's a side question.
I'll have to cut away some insulation for the 1/2 turn positions and
try that. If I find a better tune position, some of the frequencies above
may change. To scope out the quench-times, I just pick up the secondary
waveform with an antenna, and I observe on the scope display, where the
secondary free-ringdown begins.
Cheers,
John
Take care,
Bart
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Maintainer Paul Nicholson, paul@abelian.demon.co.uk.