Deep Dive: G8C02
The correct answer is A: WSPR. The digital mode used as a low-power beacon for assessing HF propagation is WSPR. WSPR (Weak Signal Propagation Reporter) is designed for low-power propagation testing. For amateur radio operators, this is a valuable propagation tool. Understanding this helps when assessing band conditions.
Why Other Answers Are Wrong
Option B (MFSK16): Incorrect. MFSK16 is a digital mode for communication, not specifically a low-power beacon for propagation testing - WSPR is designed for propagation. MFSK16 is different. Option C (PSK31): Incorrect. PSK31 is a digital mode for communication, not specifically a low-power beacon for propagation testing - WSPR is designed for propagation. PSK31 is different. Option D (SSB-SC): Incorrect. SSB-SC is single sideband suppressed carrier (analog), not a digital mode or beacon - WSPR is digital and for propagation. SSB-SC is different.
Exam Tip
Low-power beacon for HF propagation = WSPR. Think 'W'SPR = 'W'eak 'S'ignal 'P'ropagation 'R'eporter. WSPR is designed for low-power propagation testing. Not MFSK16, not PSK31, not SSB-SC - just WSPR.
Memory Aid
Low-power beacon for HF propagation = WSPR. Think 'W'SPR = 'W'eak 'S'ignal 'P'ropagation 'R'eporter. WSPR is designed for low-power propagation testing. Standard propagation assessment tool.
Real-World Example
You use WSPR (Weak Signal Propagation Reporter) as a low-power beacon to assess HF propagation. WSPR transmits at very low power (e.g., 5 watts) and reports are collected automatically, showing propagation conditions. WSPR is specifically designed for propagation assessment - it's the standard low-power beacon mode.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G8C
Reference: 2023-2027 Question Pool · G8 - Signals and Emissions
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G8C topic.