Microwave Communication
The cavity resonator

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

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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
Tune the magnetron to the correct frequency
Which may be used to tune the radar receiver

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