Abstract
Results are presented of calculations on the amplitude and frequency fluctuations generated in a floating-drift-tube klystron oscillator by thermal noise in the cavity and current and velocity noise on the electron beam. Current fluctuations at the oscillation and harmonic frequencies are found to be the main source of frequency and amplitude modulation noise. At the very lowest modulation frequencies flicker noise in the beam will take over as the source of a.m. noise. The predominant f.m. source in this region is uncertain. Methods of reducing the noise are pointed out.
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