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

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

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Microwave Communication
The Gunn diode oscillator

Generates frequencies which are below 100 MHz
Is capable of generating continuous microwave power of the order of kilowatt
Depends on the formation of charge domain
Operates over a positive resistance characteristic

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