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

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

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Microwave Communication
In a pulsed radar set, the STC circuit is used to

Improve the target bearing resolution
Increases receiver sensitivity for echoes from targets
Vary the pulse frequency in order to control the maximum target
Reduce interference from the effects of sea return

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