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

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

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Microwave Communication
The cavity resonator

In a reflect klystron has its output taken from the reflector plate
Has a low Q factor for narrow operation.
Produces a frequency which is independent of the cavity size.
Is equivalent to an LC resonant circuit

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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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