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

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

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Microwave Communication
The Gunn diode oscillator

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

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