Communication in UHF/VHF regions can be established by space or tropospheric wave. Why is it restricted to or limited to line-of-sight distance of about 40 km?

Solution

For a range of 40 km, the height of the antenna is given by,

d = \sqrt{2 rh} \Rightarrow h = \frac{d^{2}}{2 r} = \frac{(40000)^{2}}{2 \times 6.4 \times 10^{6}} = 125 m

The height of the antenna comes out to be 125 m for a range of 40 km. It is not practically possible to increase the height of the antenna greater than this value.

Some More Questions From Wave Optics Chapter

Frequencies in the UHF range normally propagate by means of

Digital signals
(i)    do not provide a continuous set of values,
(ii)    represent values as discrete steps,
(iii)    can utilize binary system, and
(iv)    can utilize decimal as well as binary systems.
Which of the above statements are true?

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Wave Optics

Communication in UHF/VHF regions can be established by space or tropospheric wave. Why is it restricted to or limited to line-of-sight distance of about 40 km?

Some More Questions From Wave Optics Chapter

Frequencies in the UHF range normally propagate by means of

Digital signals
(i)    do not provide a continuous set of values,
(ii)    represent values as discrete steps,
(iii)    can utilize binary system, and
(iv)    can utilize decimal as well as binary systems.
Which of the above statements are true?

What is space wave propagation?

What is sky wave propagation?

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NCERT Sample Papers

Entrance Exams Preparation

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For Daily Free Study Material Join wiredfaculty

Wave Optics

Communication in UHF/VHF regions can be established by space or tropospheric wave. Why is it restricted to or limited to line-of-sight distance of about 40 km?

Some More Questions From Wave Optics Chapter

Frequencies in the UHF range normally propagate by means of

Digital signals(i) do not provide a continuous set of values,(ii) represent values as discrete steps,(iii) can utilize binary system, and(iv) can utilize decimal as well as binary systems.Which of the above statements are true?

What is space wave propagation?

What is sky wave propagation?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Digital signals
(i) do not provide a continuous set of values,
(ii) represent values as discrete steps,
(iii) can utilize binary system, and
(iv) can utilize decimal as well as binary systems.
Which of the above statements are true?