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A ground receiver station is receiving a...

A ground receiver station is receiving a signal at 500 MHz transmitted from a ground transmitter at a height of 300 m located at a distance of 500 km. It is coming via

A

Ground wave

B

Space wave

C

Sky wave

D

Satellite communication

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Verified by Experts

The correct Answer is:
D
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A ground receiver station is receiving a signal at (a) 5 MHz and 100 MHz , transmitted from a ground transmitter at a height of 400 m located at a distance of 125 km . Identify whether it is coming via space wave or sky wave propagation or statellite transponder. Radius of earth = 6.4 xx 10^(6) m , maximum number density of electrons in ionsphere = 10^(12) m^(-3) .

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Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. A receiver receives a signal of frequency 108 MHz from a transmitter 300 km away. It must be coming via

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AAKASH INSTITUTE-COMMUNICATION SYSTEMS -ASSIGNMENT SECTION B Objective (Only one answer)
  1. Which of the following is an advantage of FM over AM?

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  2. The process of changing some characteristic of a carrier wave in accor...

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  3. Modulation is done in

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  4. "Need for modulation" arises due to which of the following reasons?

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  5. The area of the region covered by the TV., broadcast by a T.V. tower o...

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  6. A ground receiver station is receiving a signal at 500 MHz transmitted...

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  7. An information signal of 150 MHz to be sent across a distance of 40 km...

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  8. In an AM wave for audio frequency of 3400 cycle/s, the appropriate car...

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  9. For VHF television broadcasting, the frequency employed is generally

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  10. On a particular day, the maximum frequency reflected from the ionosphe...

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  11. Line of sight (LOS) communication is also known as

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  12. If a carrier wave of 1000 kHz is used to carry the signal, the length ...

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  13. Modem is a device used for

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  14. In frequency modulation, the amount of frequency deviation depends on ...

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  15. The communication satellites are parked at a height of (from surface o...

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  16. 3-30 MHz frequency range is known as

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  17. Long distance short-wave radio broadcasting uses

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  18. A photodetector is made from a compound semiconductor with band gap 0....

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  19. What is the range of frequencies used in satellite communication? What...

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  20. Digital signals

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