Which of the following best explains...

Which of the following best explains...

Question 1 of 270702d8lh08mcJipQ3R7zJyU

Which of the following best explains frequency-shift keying?

Question 1 of 27070

Q

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.