Microwave Communication
The resonant frequency of a cavity resonator depends upon

Its physical dimensions
The mode of operation
Its electrical dimensions
The capacitor which tunes it

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

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