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

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Microwave Communication
The Gunn diode oscillator

Operates over a positive resistance characteristic
Depends on the formation of charge domain
Is capable of generating continuous microwave power of the order of kilowatt
Generates frequencies which are below 100 MHz

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