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What is modulation necessary ?...

What is modulation necessary ?

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Low signals cannot be transmitted over long distances because of attenuation of signal, inteference due to electrical noise and practical limitations of size of the transmitting and receiving antennae. Hence modulation is necessary.
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SUBHASH PUBLICATION-COMMUNICATION SYSTEMS -TWO MARK QUESTIONS WITH ANSWERS
  1. Define modulation index. What should be its value to avoid distortion ...

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  2. Draw an amplitude modulated wave with an equation.

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  3. Draw the block diagram of generalised communication system.

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  4. Write the block diagram of a transmitter.

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  5. Draw block diagram of a reciever

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  6. Write the block diagram of a detector for AM signal.

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  7. Write the waveform at various stages of detection of the message signa...

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  8. Give the formula to calculate the range of radiations of e.m.w by an a...

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  9. How can pulse modulation be classified ?

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  10. What is meant by Pulse modulation ?

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  11. What is meant by Phase modulation ?

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  12. Mention the two types of messages that can be transmitted.

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  13. What is modulation necessary ?

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  14. How is Amplitude modulation produced ?

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  15. A message signal of frequency 10 kHz and peak voltage 5V is used to mo...

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  16. A message signal of frequency 10 kHz and peak voltage 5V is used to mo...

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  17. Match the following (Inventors and their Inventions). (1) John Logi ...

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  18. A carrier wave of peak voltage 12 V is used to transmit a message sign...

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  19. A TV transmitting antenna is 81 m tall. How much service area can it c...

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  20. For an amplitude modulated wave, the maximum amplitude is found to be ...

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