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Magnifying transmitter

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An advanced type of Tesla electrical oscillator or Tesla coil specifically intended for wireless transmission. In addition to the primary and secondary inductors characteristic of the classic Tesla coil, Tesla added a third inductor known as the "extra coil." In practice, this helical resonator is physically separated from the other two coils which comprise the master oscillator section, this in order to minimize inductive coupling between the two systems. Power from the two-coil master oscillator section is fed to the lower end of the extra coil resonator through a heavy electrical conductor.

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