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

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

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Microwave Communication
The cavity resonator

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

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Microwave Communication
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

Which may be used to tune the radar synchronizer
To the tone of the pulse repetition
Which may be used to tune the radar receiver
Tune the magnetron to the correct frequency

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