Microwave Communication
The maximum usable range of the usual radar set (on any particular range setting) is determined by

The bandwidth of the receiver IF stages
The width of the transmitted pulses
The duty cycle
The interval between transmitted pulses

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

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