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

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

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Microwave Communication
In a pulsed radar set, the STC circuit is used to

Reduce interference from the effects of sea return
Vary the pulse frequency in order to control the maximum target
Improve the target bearing resolution
Increases receiver sensitivity for echoes from targets

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