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The ARRL "Making Your First Contact" Guide states, under the "FM Repeaters" section, "If you want to join a conversation already in progress, transmit your call sign during a break between transmissions. The station that transmits next should acknowledge you. Don’t use the word BREAK to join a conversation. BREAK generally suggests an emergency and indicates that all stations should stand by for the station with emergency traffic."* http://www.arrl.org/making-your-first-contact