SOB77 RTP SLOT In one method, a sample of the output signal is applied to a high-Q tuned circuit, whose resonant frequency is slightly above the output frequency. The generator's frequency falls on the "skirt" of the LC circuit's impedance curve, where the impedance increases rapidly with frequency. Efforts were made to invent transmitters that would produce continuous waves -- a sinusoidal alternating current at a single frequency. A large Alexanderson alternator might produce 500 kW of output radio-frequency energy and would be water- or oil-cooled. To produce high power, the clearance between the rotor and stator had to be kept to only 1 mm.|Nokia Lumia 928