Microwave Communication
The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Electron transit time
Inter-electrode capacitance
Degree of emission from the cathode
Distributed lead inductance

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

Velocity modulation at the input cavity creates density modulation at the output cavity
Frequency modulation at the input cavity creates velocity modulation at the output cavity
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

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