Microwave Communication
The main frequency determining element of a klystron is

The repeller voltage
Its resonant cavity
Its mode of operation
The accelerating voltage

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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.

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

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