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

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

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Microwave Communication
As the electron beam moves through a klystron’s intercavity drift space

Phase modulation at the input cavity creates velocity modulation at the output cavity.
Density modulation at the input cavity creates velocity modulation at the output cavity
Frequency modulation at the input cavity creates velocity modulation at the output cavity
Velocity modulation at the input cavity creates density modulation at the output cavity

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