Ham Radio General Class Practice Test 2025 – Complete Exam Prep

The prosign that is sent to indicate the end of a formal message when using CW (Continuous Wave) is represented by the letters "AR." In Morse code, "AR" signifies the conclusion of the message and is similar to saying "over and out." It serves as an important cue to the receiving operator that the transmission has ended, allowing them to know that they should not expect any further information unless prompted.

In contrast, the other prosigns have specific meanings as well. "SK" indicates the end of a contact and signifies that the operator is no longer active, often used when closing down a station permanently or in case of an emergency. "BK" is typically used to request a response from another station, functioning as an invitation to continue the conversation. "KN" is utilized to signify that only a specific station should reply, indicating to all other stations that they should not respond.

Understanding the meanings of these prosigns is crucial for effective communication in amateur radio, particularly when operating in CW mode.