A Method of Producing a Square Wave of Radio Frequency

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Abstract
A radio-frequency square wave, suitable for the measurement of the mobility of ions, has been obtained by using a circuit containing three vacuum tubes. The first tube operates as an oscillator. The potential of the second tube, which operates as a rectifier, is controlled by the grid circuit coil of the oscillator. The third tube is connected so that the plate current will be cut off during the half period when the rectified current is flowing in the plate circuit of tube 2. The rise of the voltage of the square wave is approximately exponential, due to the charge on the grid and the plate of tubes 2 and 3, which must be discharged through a resistance which couples the plate circuit of tube 2 to the grid of tube 3. A cathode ray oscillograph tube indicates that the voltage rises to approximately its maximum value in 1/10 of the half period. A square wave of 120 volts may be obtained with Western Electric "E" tubes. Three methods of amplification are given by which a square wave with a very much larger voltage may be obtained.

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