Microwave Communication
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

The shortest possible time
Low-pass filters
The restricted high-frequency response
A long time constant

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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
Tune the magnetron to the correct frequency
To the tone of the pulse repetition

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