An ultra low noise X-band signal source

This paper describes the various steps taken in a program to provide a 500-mw X-band signal having state-of-the-art signal purity, i.e., one with the least possible AM and FM noise. The design and performance of the final device, a high voltage, convection cooled, low noise two-cavity klystron oscillator matched to a high-Q external stabilizing cavity, is described.