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Question 467

What is frequency division multiplexing (FDM)?

  1. The transmitted signal jumps from band to band at a predetermined rate
  2. Dividing the transmitted signal into separate frequency bands that each carry a different data streamCorrect answer
  3. The transmitted signal is divided into packets of information
  4. Two or more information streams are merged into a digital combiner, which then pulse position modulates the transmitter

Explanation

Frequency division multiplexing gives each data stream its own slice of the channel spectrum, so all streams are transmitted at the same time on different frequencies and are separated at the receiver by filtering. Sharing by time slots is time division multiplexing, and moving between frequencies on a schedule is frequency hopping.

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Question 467: What is frequency division multiplexing (FDM)? · FCC Amateur Extra Class (Element 4) · Questena