Microwave Communication
A traveling-wave tube (TWT) amplifies by virtue of

The effect of an external magnetic field
The energy liberated form the collector
The energy contained the cavity resonators
The absorption of energy by the signal from an electron stream

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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
Increases receiver sensitivity for echoes from targets
Vary the pulse frequency in order to control the maximum target

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