Microwave Communication
A reflex klystron is oscillating at the frequency of its resonant cavity. If the reflector voltage is made slightly less negative, the

Oscillation will cease
The frequency will decrease
Output power would increase
Bunching would occur earlier in time

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Microwave Communication
The Gunn diode oscillator

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

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