Microwave Communication
Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.

Sixth
Third
Fifth
Fourth

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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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Microwave Communication
The cavity resonator

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

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