Which of the following best explains...

Question 1 / 270702d8lh08mcJipQ3R7zJyU

Question 1 of 270702d8lh08mcJipQ3R7zJyU

Which of the following best explains frequency-shift keying?

Question 1 of 27070

Which of the following best explains frequency-shift keying?

🔍 Key Concepts

• Frequency-shift keying (FSK) as a type of digital modulation • Difference between input (keying signal) and output (modulated carrier) in a transmitter • How a signal changes when a telegraph key or keying circuit is closed (depressed) versus open

💭 Think About

• In FSK, what is being shifted: the characteristics of the message signal, or the characteristics of the carrier that is transmitted? • When the key is depressed, does that action directly change the input signal itself, or does it cause the transmitter to change something about the carrier it sends out? • Which choice correctly describes the behavior of a digital keying system, where one key state represents one frequency and the other state represents another frequency?

✅ Before You Answer

• Identify whether FSK is defined by change in carrier frequency or by change in something else (like amplitude or phase). • Check which option correctly treats the key as a control that switches the transmitted frequency, not as the signal being transmitted itself. • Eliminate any option that confuses antenna behavior with modulation of the carrier signal.

Question 1 of 27070

Which of the following best explains frequency-shift keying?

The shifting of frequencies by modulating the carrier antenna

Changing the frequency of the input when the key is depressed

Changing the frequency of the output when the key is depressed

None of the above

Question 1 / 270702d8lh08mcJipQ3R7zJyU

Question 1 of 270702d8lh08mcJipQ3R7zJyU

Which of the following best explains frequency-shift keying?

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Question 1 of 27070

Which of the following best explains frequency-shift keying?