Microwave Communication
The coarse frequency adjustment of a reflex klystron is accomplished by

Varying the repeller voltage
Adjusting the flexible wall of the resonant cavity
An adjustment in the synchronizer
The AFC system

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Microwave Communication
The cavity resonator

Produces a frequency which is independent of the cavity size.
In a reflect klystron has its output taken from the reflector plate
Is equivalent to an LC resonant circuit
Has a low Q factor for narrow operation.

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