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.

Third
Fifth
Fourth
Sixth

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

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

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Microwave Communication
The cavity resonator

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

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