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Modulation is done in...

Modulation is done in

A

Transmitter

B

Radio receiver

C

in communication channel

D

None of these

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The correct Answer is:
A
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The intensity of light from a continuously emitting laser source operating at 638 nm wavelength is modulated at 1 GHz . The modulation is done by momentarily cutting the intensity off with a frequency of 1 GHz . What is the farthest distance apart two detectors can be placed in the line of the laser light so that they can see the portions of the same pulse simultaneously ? ( consider the speed of light in air 3 xx 10^8 m//s )

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Modulation is the phenomenon of :

Assertion : Modulation index is the degree to which the carrier wave is modulated . Reason : For the strong and clear reception, the value of modulation index should be very small.

Modulation is the process of superposing

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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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