Microwave Communication
Oscillators of a klystron tube are maintained

By bunches of electrons passing the cavity grids
By feedback between the accelerating grid and the repeller
By plate-to-cathode feedback
By circulating bunches of electrons within the cavities.

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

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

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