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Re: The 1500t secondary myth (long)
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- Subject: Re: The 1500t secondary myth (long)
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- Date: Sat, 04 Dec 2004 12:44:34 -0700
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Original poster: FutureT@xxxxxxx
In a message dated 12/2/04 11:05:23 AM Eastern Standard Time,
See my earlier posts for details. John Freau's TT-42, which is still one
> > >the most efficient coils ever, has Zo=44k. John found that adding a
> > >toroid to his TT-42 (which would lower the Zo towards 36k) increased the
> > >spark length.
> > >And, Richie Burnett found that a coil with Zo=22k performed poorly, but
> > >changing to a resonator with Zo=~50k gave much bigger sparks with the
> > >bang energy.
My old research coil was somewhat more efficient than the TT-42 coil
when the TT-42 is fitted with the normal 4" x 13" smooth toroid.
The TT-42 coil requires a "robust" NST to obtain the 42" sparks
using the normal toroid, but the old research coil produced 42"
sparks using a normal NST. The TT-42 gave 44" sparks using
a 6" x 24" smooth toroid which barely permitted breakout to occur.
I ran the research coil using a potential transformer for
better efficiency at times. I often used a 6.5" x 24" secondary
wound with 28awg formvar magnet wire. At other times I used
a 4.2" x 23" secondary also wound with 28awg wire. In both
cases the toroid was a 5" x 20" ducting toroid, for producing
the 42" sparks using about 620 watts (wallplug). I seem to
remember that both secondaries gave about equal spark lengths.
So it may be interesting to calculate the Zo for those two