Microwave Communication
A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be

A decrease in range
A decrease in gain
A reduction in horizontal resolution
No noticeable effect

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

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

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