PSK stands for Phase Shift Keying; what does it change?

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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

PSK stands for Phase Shift Keying; what does it change?

Explanation:
PSK encodes data by shifting the phase of the carrier signal while keeping the amplitude and frequency essentially constant. The information sits in which phase the carrier takes, not in how tall (amplitude) or how fast (frequency) it oscillates. For example, two-phase PSK (BPSK) uses two opposite phases, while four-phase PSK (QPSK) uses four distinct phases. Because only the phase changes, the envelope remains stable, which is advantageous for power efficiency and resistance to amplitude distortions. So the correct idea is that PSK changes the phase of the carrier.

PSK encodes data by shifting the phase of the carrier signal while keeping the amplitude and frequency essentially constant. The information sits in which phase the carrier takes, not in how tall (amplitude) or how fast (frequency) it oscillates. For example, two-phase PSK (BPSK) uses two opposite phases, while four-phase PSK (QPSK) uses four distinct phases. Because only the phase changes, the envelope remains stable, which is advantageous for power efficiency and resistance to amplitude distortions. So the correct idea is that PSK changes the phase of the carrier.

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