Microwave Communication Systems – 1 – 2

6. The free space attenuation between two microwave antennas 40 km apart operating at 8 GHz is :

(a) 146.7 dB
(b) 142.55 dB
(c) 82.5 dB
(d) 86.7 dB

Answer
Answer : (b)

Explanation
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7. If the correction factor k equals 4/3 of the earth’s curvature, the microwave beam would have a curvature that is …………… than that of the earth.

(a) more
(b) less
(c) equal
(d) not related

Answer
Answer : (a)

Explanation
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8. Microwaves link repeaters are typically 50 km apart :

(a) Because of atmospheric attenuation
(b) Because of earth’s curvature
(c) Because of output tube power limitations
(d) None of these

Answer
Answer : (b)

Explanation
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9. When microwave, signals follow the curvature of the earth, this is known as :

(a) The Faraday effect
(b) Ducting
(c) Tropospheric scatter
(d) Ionospheric reflection

Answer
Answer : (b)

Explanation
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10. Which of the following antenna is best excited from a waveguide :

(a) Horn
(b) Discone
(c) Helical
(d) Biconical

Answer
Answer : (c)

Explanation
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