When sending CW, what does a “C” mean when added to the RST report?
The correct answer is A: Chirpy or unstable signal. When sending CW, a 'C' added to the RST report means chirpy or unstable signal. The 'C' indicates the signal has frequency instability or chirp (frequency variation during transmission). For amateur radio operators, this helps describe signal quality. Understanding this helps when giving accurate signal reports.
Exam Tip
RST + C = chirpy or unstable signal. Think 'C' = 'C'hirpy or 'C'hanging frequency. The 'C' suffix indicates the signal has frequency instability or chirp. Not about S meter, copy percentage, or key clicks - just signal stability.
Memory Aid
"RST + C = chirpy or unstable signal. Think 'C' = 'C'hirpy or 'C'hanging frequency. The 'C' suffix indicates frequency instability or chirp in the signal. Standard RST report suffix."
Real-World Application
You receive a CW signal that sounds like it's changing frequency slightly (chirping). You give a signal report of '599C' - the 'C' indicates the signal is chirpy or unstable. This helps the operator know their signal has frequency instability that needs to be fixed.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. 'C' doesn't mean the report was read from an S meter - that's not what 'C' indicates. 'C' is about signal quality, not report source.
Option C: Incorrect. 'C' doesn't mean 100% copy - that's not a standard RST meaning. 'C' indicates signal instability.
Option D: Incorrect. 'C' doesn't mean key clicks - key clicks would be indicated differently. 'C' specifically means chirpy or unstable signal.
题目解析
The correct answer is A: Chirpy or unstable signal. When sending CW, a 'C' added to the RST report means chirpy or unstable signal. The 'C' indicates the signal has frequency instability or chirp (frequency variation during transmission). For amateur radio operators, this helps describe signal quality. Understanding this helps when giving accurate signal reports.
考试技巧
RST + C = chirpy or unstable signal. Think 'C' = 'C'hirpy or 'C'hanging frequency. The 'C' suffix indicates the signal has frequency instability or chirp. Not about S meter, copy percentage, or key clicks - just signal stability.
记忆口诀
RST + C = chirpy or unstable signal. Think 'C' = 'C'hirpy or 'C'hanging frequency. The 'C' suffix indicates frequency instability or chirp in the signal. Standard RST report suffix.
实际应用示例
You receive a CW signal that sounds like it's changing frequency slightly (chirping). You give a signal report of '599C' - the 'C' indicates the signal is chirpy or unstable. This helps the operator know their signal has frequency instability that needs to be fixed.
错误选项分析
Option B: Incorrect. 'C' doesn't mean the report was read from an S meter - that's not what 'C' indicates. 'C' is about signal quality, not report source. Option C: Incorrect. 'C' doesn't mean 100% copy - that's not a standard RST meaning. 'C' indicates signal instability. Option D: Incorrect. 'C' doesn't mean key clicks - key clicks would be indicated differently. 'C' specifically means chirpy or unstable signal.
知识点
RST report, C suffix, Signal quality, CW procedures
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.