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Especially when there's more than one person in a QSO (conversation) you want to say the call sign of the next person in turn to speak at the end of your transmission. For example, "... and that's the weather today, over to A0NEW." This prevents incidents of "doubling" which occurs when two or more ham operators start to transmit at the same time not aware of the other.Especially when there's more than one person in a QSO (conversation) you want to say the call sign of the next person in turn to speak at the end of your transmission. For example, "... and that's the weather today, over to A0NEW." This prevents incidents of "doubling" which occurs when two or more ham operators start to transmit at the same time not aware of the other. It's good to know who goes next!