Question
Which of the following types of signal has the narrowest bandwidth?
Answer Options
- A) FM voice
- B) SSB voice
- C) CW
- D) Slow-scan TV
Correct Answer: C
Explanation
Bandwidth refers to the total width of the radio spectrum occupied by a signal. A narrower bandwidth concentrates energy, making the signal easier to hear and copy when it’s very weak.
CW (Continuous Wave) or Morse code signals have the narrowest bandwidth of any mode used by amateurs, typically requiring only about 150\text{ Hz} (Hertz) to be transmitted (T8A11). This extremely narrow bandwidth is why CW is an excellent mode for communicating over long distances and through heavy interference.
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