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Modulation is used to 1. Separate different transmissions 2. Reduce the bandwidth requirement 3. Allow the use of practicable antennas 4. Ensure that intelligence may be transmitted over long distances Which of the above statements are correct?

Modulation is used to 1. Separate different transmissions 2. Reduce the bandwidth requirement 3. Allow the use of practicable antennas 4. Ensure that intelligence may be transmitted over long distances Which of the above statements are correct? Correct Answer 1, 3 and 4 only

The features of modulation are :

  • Modulation is the process of increasing the frequency of the signal to reduce the antenna height requirement. This is because the antenna height must equal to λ/4, for effective transmission. (Statement 3 is correct)
  • Modulation enables Multiplexing of several message signal on a given channel, which is helpful in the transmission of different frequency signals through a single channel. (Statement 1 is correct)
  • The Bandwidth requirement is increased when the message signal is modulated. This is primarily because the spectrum of the message signal is shifted by the presence of the carrier. (Statement 2 is not correct)
  • No signal mixing so it provides better reception of message signal.
  • It helps in transmitting message signals over long distances. (Statement 4 is correct)

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