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Microwave Communication

Microwave Communication
Calculate the effective earth’s radius if the surface refractivity is 301.

8493 km
6370 mi
6370 km
8493 mmi

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Microwave Communication
A traveling-wave tube (TWT) amplifies by virtue of

The absorption of energy by the signal from an electron stream
The energy contained the cavity resonators
The energy liberated form the collector
The effect of an external magnetic field

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Microwave Communication
A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is

1,000 watts
100 watts
1,000,000 watts
10,000 watts

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Microwave Communication
Coupling into and out of a traveling-wave tube can be accompanied by a

Cavity match
All of these
Waveguide match
Direct coax-helix match

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Microwave Communication
Which of the reception problems below that is not due to multipath?

Rayleigh fading
Delayed spreading
Random Doppler shift
Slow fading

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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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