What prosign is sent to indicate the end of a formal message when using CW?
The correct answer is C: AR. The prosign sent to indicate the end of a formal message when using CW is AR. 'AR' means 'end of message' and is used to mark the conclusion of a formal message. For amateur radio operators, this is standard CW procedure. Understanding this helps when sending formal messages or traffic. 'AR' is different from 'SK' (end of contact).
Exam Tip
End of formal message = AR prosign. Think 'A'R = 'A'fter 'R'eport (end of message). 'AR' indicates the end of a formal message. 'SK' is end of contact, 'BK' is break, 'KN' is specific station - all different from 'AR'.
Memory Aid
"End of formal message = AR prosign. Think 'A'R = 'A'fter 'R'eport. 'AR' indicates the end of a formal message in CW. Standard prosign for message termination. Different from 'SK' (end of contact)."
Real-World Application
You send a formal message via CW. At the end of the message, you send 'AR' to indicate the message is complete. This is different from 'SK' (end of contact) - 'AR' specifically marks the end of a message, while 'SK' marks the end of the entire contact.
Key Concepts
Why Other Options Are Wrong
Option A (SK): Incorrect. 'SK' means 'end of contact' or 'silent key' (deceased operator), not end of message. 'AR' is for end of message.
Option B (BK): Incorrect. 'BK' means 'break' (I'm breaking in or go ahead), not end of message. 'AR' is for end of message.
Option D (KN): Incorrect. 'KN' means 'go ahead, specific station(s) only,' not end of message. 'AR' is for end of message.
题目解析
The correct answer is C: AR. The prosign sent to indicate the end of a formal message when using CW is AR. 'AR' means 'end of message' and is used to mark the conclusion of a formal message. For amateur radio operators, this is standard CW procedure. Understanding this helps when sending formal messages or traffic. 'AR' is different from 'SK' (end of contact).
考试技巧
End of formal message = AR prosign. Think 'A'R = 'A'fter 'R'eport (end of message). 'AR' indicates the end of a formal message. 'SK' is end of contact, 'BK' is break, 'KN' is specific station - all different from 'AR'.
记忆口诀
End of formal message = AR prosign. Think 'A'R = 'A'fter 'R'eport. 'AR' indicates the end of a formal message in CW. Standard prosign for message termination. Different from 'SK' (end of contact).
实际应用示例
You send a formal message via CW. At the end of the message, you send 'AR' to indicate the message is complete. This is different from 'SK' (end of contact) - 'AR' specifically marks the end of a message, while 'SK' marks the end of the entire contact.
错误选项分析
Option A (SK): Incorrect. 'SK' means 'end of contact' or 'silent key' (deceased operator), not end of message. 'AR' is for end of message. Option B (BK): Incorrect. 'BK' means 'break' (I'm breaking in or go ahead), not end of message. 'AR' is for end of message. Option D (KN): Incorrect. 'KN' means 'go ahead, specific station(s) only,' not end of message. 'AR' is for end of message.
知识点
AR prosign, End of message, CW prosigns, Formal messages
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.