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A frequency-agile phase lock system for millimeter-wave klystrons is described. The system locks the klystron to a crystal-controlled reference signal derived from a frequency synthesizer. By programming the synthesizer, the klystron can be stepped through any sequence of frequencies lying within a band roughly 200 MHz wide. Acquisition of phase lock typically requires 1 msec. The 200-MHz pull-in range is achieved through the use of combined frequency and phase feedback; there is no ’’search’’ mode. The measured linewidth of an 82-GHz phase-locked klystron is ?10 Hz.
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P. Henry (1976) studied this question.
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