Microwave Communication
The aquadag coating on the inside of PPI tube is used

All of these
As a second anode and to prevent the build-up of secondary field
To focus the beam of primary electrons
To shield the electron beam from unidirectional magnetic

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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
Generates frequencies which are below 100 MHz
Operates over a positive resistance characteristic

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