What does the abbreviation "PSK" mean?
The correct answer is B: Phase Shift Keying. The abbreviation PSK means Phase Shift Keying. PSK is a digital modulation technique where the phase of the carrier signal is shifted to represent different data bits. Common PSK modes include BPSK (Binary PSK), QPSK (Quadrature PSK), and PSK31, PSK63 (popular amateur digital modes). For amateur radio operators, PSK is a popular digital mode on HF bands, offering good weak-signal performance and efficient bandwidth use. Understanding PSK helps when operating digital modes.
Exam Tip
PSK = Phase Shift Keying. Think 'P'SK = 'P'hase 'S'hift 'K'eying. Digital modulation where carrier phase is shifted to represent data. Popular amateur modes include PSK31 and PSK63. Not pulse, packet, or slide keying.
Memory Aid
"PSK = Phase Shift Keying. Think 'P'SK = 'P'hase 'S'hift 'K'eying. Digital modulation where carrier phase shifts represent data bits. Popular for weak-signal digital work."
Real-World Application
You operate PSK31 on 20 meters. Your computer generates the PSK signal by shifting the carrier phase - one phase for a '1' bit, another phase for a '0' bit. This phase-shift keying creates a narrow, efficient digital signal that works well for weak-signal contacts. PSK is one of the most popular digital modes on HF.
Key Concepts
Why Other Options Are Wrong
Option A (Pulse Shift Keying): Incorrect. PSK doesn't stand for Pulse Shift Keying - it's Phase Shift Keying. Pulse modulation is a different technique.
Option C (Packet Short Keying): Incorrect. This is a made-up term. PSK is Phase Shift Keying, not related to packet radio or 'short keying.'
Option D (Phased Slide Keying): Incorrect. This is not a real term. PSK is Phase Shift Keying, where the carrier phase is shifted, not 'slid.'
题目解析
The correct answer is B: Phase Shift Keying. The abbreviation PSK means Phase Shift Keying. PSK is a digital modulation technique where the phase of the carrier signal is shifted to represent different data bits. Common PSK modes include BPSK (Binary PSK), QPSK (Quadrature PSK), and PSK31, PSK63 (popular amateur digital modes). For amateur radio operators, PSK is a popular digital mode on HF bands, offering good weak-signal performance and efficient bandwidth use. Understanding PSK helps when operating digital modes.
考试技巧
PSK = Phase Shift Keying. Think 'P'SK = 'P'hase 'S'hift 'K'eying. Digital modulation where carrier phase is shifted to represent data. Popular amateur modes include PSK31 and PSK63. Not pulse, packet, or slide keying.
记忆口诀
PSK = Phase Shift Keying. Think 'P'SK = 'P'hase 'S'hift 'K'eying. Digital modulation where carrier phase shifts represent data bits. Popular for weak-signal digital work.
实际应用示例
You operate PSK31 on 20 meters. Your computer generates the PSK signal by shifting the carrier phase - one phase for a '1' bit, another phase for a '0' bit. This phase-shift keying creates a narrow, efficient digital signal that works well for weak-signal contacts. PSK is one of the most popular digital modes on HF.
错误选项分析
Option A (Pulse Shift Keying): Incorrect. PSK doesn't stand for Pulse Shift Keying - it's Phase Shift Keying. Pulse modulation is a different technique. Option C (Packet Short Keying): Incorrect. This is a made-up term. PSK is Phase Shift Keying, not related to packet radio or 'short keying.' Option D (Phased Slide Keying): Incorrect. This is not a real term. PSK is Phase Shift Keying, where the carrier phase is shifted, not 'slid.'
知识点
PSK, Phase Shift Keying, Digital modulation, Digital modes
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.