Question: . a. Explain the ground wave and sky wave with the help of a diagram and mention the frequencies used in each. (2+2 marks) b.

. a. Explain the ground wave and sky wave with the help of a diagram and mention the frequencies

used in each. (2+2 marks)

b. Why optical fiber band L operates in 1561-1620 nm wavelength range? (2 marks)

c. Explain digital signal encoding with an example. (2 marks)

d. Explain modulation with the help of an example. (2 marks)

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