Question
What is the approximate bandwidth required to transmit a CW signal?
Answer Options
- A) 2.4 kHz
- B) 150 Hz
- C) 1000 Hz
- D) 15 kHz
Correct Answer: B
Explanation
Continuous Wave (CW), or Morse code (T8D09), is the simplest form of radio communication, consisting only of a carrier wave being turned simply on and off (keying). Because the signal carries only this very basic binary information (dot or dash), it requires the smallest amount of spectrum.
The approximate bandwidth required to transmit a CW signal is extremely narrow, typically about 150 Hz (Hertz) or less. This minimal requirement is what makes CW the best mode for communicating over extreme distances or through very heavy interference, as the receiver can use extremely sharp filters to block out everything else (T4B08).
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