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Which of the following is an example of CW transmission?

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Which of the following is an example of CW transmission?

(a) Sensor data transmission

(b) Morse code transmission

(c) Audio signal transmission

(d) TV wave transmission

The question was asked in unit test.

Origin of the question is Sidebands and Frequency Domain in section Amplitude & Frequency Modulation of Avionics

1 Answer

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Best answer
Correct choice is (b) Morse code transmission

Explanation: Code transmission such as morse code are usually called continuous-wave (CW) transmissions. This kind of transmission is also referred to as ON/OFF keying (OOK). Despite the fact that only the carrier is being transmitted, sidebands are generated by such ON/OFF signals.

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