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

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
All of these

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Microwave Communication
The Gunn diode oscillator

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

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Microwave Communication
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

Tune the magnetron to the correct frequency
To the tone of the pulse repetition
Which may be used to tune the radar receiver
Which may be used to tune the radar synchronizer

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