SATHEE: communication-systems Question 22

Communication Systems

communication-systems Question 22

Question: Q. 10. (i) What is line of sight (LOS) communication? What is the range of their frequencies?

(ii) A transmitting antenna at the top of a tower has a height of $20 m$ and the height of the receiving antenna is $45 m$ . Calculate the maximum distance between them for satisfactory communication in LOS mode. $($ Radius of the Earth $= 6.4 \times 10^{6} m$ )

U] [O.D. I, II, III, 2013]

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Solution:

Ans. Space waves are used for the line of sight (LOS) communication.

$1 / 2$

The range of their frequencies is $40 MHz$ and above.

We have, height of transmitting antenna, $h_{T} = 20 m$ and height of receiving antenna, $h_{R} = 45 m$ .

Then, maximum distance between the two antennas,

$\begin{aligned} d_{M} = \sqrt{2 h_{T} R} + \sqrt{2 h_{R} R} & d_{M} = \sqrt{2 \times 20 \times 6.4 \times 10^{6}} \end{aligned}$

$\sqrt{2 \times 45 \times 6.4 \times 10^{6}}$

$= 20 \times 8 \times 100 + 8 \times 100 \times 30$

$= 8 \times 100 (20 + 30)$

$= 40000 m = 40 km$

Communication Systems

communication-systems Question 22

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Communication Systems

communication-systems Question 22

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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