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A radio modulation mode used to send and receive digital information via radio. PACTOR is an evolution of both AMTOR and packet radio. PACTOR is a set of standardized modes used by Amateur operators for FSK radioteletype transfer of digital information over HF. A radio modulation mode used to send and receive digital information via radio. PACTOR is an evolution of both AMTOR and packet radio. PACTOR is a set of standardized modes used by Amateur operators for FSK radioteletype transfer of digital information over HF. A PACTOR communication is between two stations only.