Deep Dive: T8D06
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.
Why Other Answers 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.'
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 Example
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.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T8D
Reference: 2022-2026 Question Pool · T8 - Signals and emissions
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T8D topic.