Microwave Communication
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?

To slow down the signal on the helix
To accelerate the electron
To velocity modulate the electron beam
To keep the electrons from spreading out

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

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

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