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What does the Q signal "QSL" mean?

  1. Send slower

  2. We have already confirmed by card

  3. I acknowledge receipt

  4. We have worked before

The correct answer is: I acknowledge receipt

The Q signal "QSL" is used in amateur radio communication to indicate acknowledgment of receipt. When a operator sends "QSL," they are confirming that they have received a particular message or information from another station. This signal plays a vital role in ensuring effective communication and verifies that messages sent during a transmission have been understood and acknowledged. In the context of amateur radio, confirming receipt can help improve operating efficiency and clarify that information has been successfully conveyed between operators. While the other options pertain to different aspects of communication, "QSL" specifically focuses on the acknowledgment of received information, making it the best choice in this context.