Microwave Communication
The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Distributed lead inductance
Electron transit time
Inter-electrode capacitance
Degree of emission from the cathode

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

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

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