Which modulation changes frequency to represent digital data?

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Study for the AFSC Cyberspace Operations Officer (17D) Block 4 Exam. Master key concepts with interactive flashcards and multiple-choice questions, each explained for clarity. Prepare effectively for a successful exam outcome!

Multiple Choice

Which modulation changes frequency to represent digital data?

Explanation:
Encoding digital data by altering the carrier frequency is what Frequency Shift Keying does. In binary FSK, two distinct frequencies carry the bits: one frequency represents a 0, the other represents a 1. The transmitter switches between these frequencies as the data stream changes, and the receiver detects which frequency is present to recover the bits. Other modulation methods encode data by changing other properties of the carrier. Amplitude Modulation changes the carrier’s amplitude, not its frequency. Phase Shift Keying encodes data by changing the phase of the carrier, while Amplitude Shift Keying varies amplitude as well.

Encoding digital data by altering the carrier frequency is what Frequency Shift Keying does. In binary FSK, two distinct frequencies carry the bits: one frequency represents a 0, the other represents a 1. The transmitter switches between these frequencies as the data stream changes, and the receiver detects which frequency is present to recover the bits.

Other modulation methods encode data by changing other properties of the carrier. Amplitude Modulation changes the carrier’s amplitude, not its frequency. Phase Shift Keying encodes data by changing the phase of the carrier, while Amplitude Shift Keying varies amplitude as well.

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