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A system developed by R. V. Pound for frequency-stabilizing a microwave oscillator is discussed. The frequency range of the Pound stabilizer is considered, and a change in the microwave circuit is described which increases the usable frequency range of the stabilizing circuit. This new circuit is discussed in detail, and a graphical method of obtaining the frequency versus voltage characteristic is presented. The effect of harmonic distortion in the output of the stabilizing circuit when the microwave oscillator is frequency-modulated is discussed, and the amount of the distortion is evaluated.