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
Fourth
Fifth
Sixth

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Microwave Communication
The cavity resonator

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

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Microwave Communication
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

Which may be used to tune the radar receiver
Tune the magnetron to the correct frequency
To the tone of the pulse repetition
Which may be used to tune the radar synchronizer

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