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

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

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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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