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प्रश्न
Explain, with the help of a suitable diagram, the space wave mode of propagation. Give two examples in communication systems where this mode is used. What is the frequency range of these waves? Give reason for using this range of frequency.
उत्तर
A space wave travels in straight line from a transmitting antenna to a receiving antenna. They are used for transmitting frequency signals above 40 MHz. Space waves are used for line of sight communication as well as satellite communication. The propagation of signal through a space wave is shown below:
Space wave mode of propagation is used in:
(i) Television broadcast
(ii) Satellite communication
The frequency range for these waves is 40 MHz or above. The reason for using this range of frequency is that at frequencies above 40 MHz, the antennas are relatively smaller and can be placed at heights of many wavelengths above the ground.
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संबंधित प्रश्न
Draw a neat, labelled block diagram for a generalised communication system.
Distinguish between ‘Analog’ and ‘Digital’ forms of communication.
Explain briefly two commonly used applications of the ‘Internet’.
What are the three basic units in communication systems ? Write briefly the function of each of these.
Write any three applications of the Internet used in communication systems.
Write the functions of each of the following in communication system : Channel
Distinguish between a transducer and a repeater.
What type of wave propagation is used in the basic mode of communication?
Write, giving a reason, the frequency range used in this mode of communication of propagation.
Mention the function of any two of the following used
(i) Transducer
(ii) Repeater
(iii) Transmitter
(iv) Bandpass Filter
