What does it mean when a CW operator sends “KN” at the end of a transmission?
The correct answer is C: Listening only for a specific station or stations. When a CW operator sends 'KN' at the end of a transmission, it means they are listening only for a specific station or stations. 'KN' is a prosign meaning 'go ahead, specific station(s) only' - don't call if you're not the intended station. For amateur radio operators, this helps manage contacts and prevents unwanted callers. Understanding this helps when operating CW.
Exam Tip
KN = listening for specific station(s). Think 'K'N = 'K'eep 'N'ame (specific station). Means 'go ahead, specific station(s) only' - don't call if you're not the intended station. Not about US stations, break-in, or closing.
Memory Aid
"KN = listening for specific station(s). Think 'K'N = 'K'eep 'N'ame. Means 'go ahead, specific station(s) only.' Don't call if you're not the intended station. Standard CW prosign for directed calling."
Real-World Application
You're in a CW contact and send 'KN' at the end of your transmission. This tells the other station (and anyone listening) that you're listening only for that specific station to respond. Other stations should not call. This helps manage the contact and prevents interference from unwanted callers.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 'KN' doesn't mean no US stations should call - it means listening for specific station(s), which could be US or foreign. It's about specific stations, not US vs foreign.
Option B: Incorrect. 'KN' isn't about full break-in operation - that's QSK. 'KN' is about who should respond.
Option D: Incorrect. 'KN' doesn't mean closing the station - that's 'SK' (end of contact). 'KN' means listening for specific station(s).
题目解析
The correct answer is C: Listening only for a specific station or stations. When a CW operator sends 'KN' at the end of a transmission, it means they are listening only for a specific station or stations. 'KN' is a prosign meaning 'go ahead, specific station(s) only' - don't call if you're not the intended station. For amateur radio operators, this helps manage contacts and prevents unwanted callers. Understanding this helps when operating CW.
考试技巧
KN = listening for specific station(s). Think 'K'N = 'K'eep 'N'ame (specific station). Means 'go ahead, specific station(s) only' - don't call if you're not the intended station. Not about US stations, break-in, or closing.
记忆口诀
KN = listening for specific station(s). Think 'K'N = 'K'eep 'N'ame. Means 'go ahead, specific station(s) only.' Don't call if you're not the intended station. Standard CW prosign for directed calling.
实际应用示例
You're in a CW contact and send 'KN' at the end of your transmission. This tells the other station (and anyone listening) that you're listening only for that specific station to respond. Other stations should not call. This helps manage the contact and prevents interference from unwanted callers.
错误选项分析
Option A: Incorrect. 'KN' doesn't mean no US stations should call - it means listening for specific station(s), which could be US or foreign. It's about specific stations, not US vs foreign. Option B: Incorrect. 'KN' isn't about full break-in operation - that's QSK. 'KN' is about who should respond. Option D: Incorrect. 'KN' doesn't mean closing the station - that's 'SK' (end of contact). 'KN' means listening for specific station(s).
知识点
KN prosign, CW procedures, Specific station calling, CW prosigns
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.