Microwave Communication
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?

To accelerate the electron
To slow down the signal on the helix
To keep the electrons from spreading out
To velocity modulate the electron beam

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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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