Microwave Communication
The coarse frequency adjustment of a reflex klystron is accomplished by

The AFC system
An adjustment in the synchronizer
Varying the repeller voltage
Adjusting the flexible wall of the resonant cavity

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Microwave Communication
The Gunn diode oscillator

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

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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.

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
To the tone of the pulse repetition

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