Microwave Communication
The cavity resonator

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

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

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

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