Long before we were using RF to communicate very far Tesla had it all
right there......
http://www.magnetricity.com/NeoG/Bifilar.php
Nikola Tesla explains that a standard coil of 1000 turns with a
potential of 100 volts across it will have a difference of 0.1 volt
between turns. A similar BIFILAR coil will have a potential of 50 volts
between turns.
In that the stored energy is a function of the square of the voltages
the energy in the BIFILAR will be ... 50 squared / .1 squared = 2500 /
.01 = 250,000 times greater than the standard coil
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"Bifilar wound coils are used in the system because a bifilar wound coil
maximizes the voltage difference between its turns, the current is then
minimized."
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http://www.teslatech.info/ttstore/report/articles/v2n2art/radiant.htm
"United States Patent Number 512,340 - COIL FOR ELECTROMAGNETS - Nikola
Tesla, Inventor
FWIW,
Herb, KV4FZ
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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