PACTOR
Digital radio modulation mode / From Wikipedia, the free encyclopedia
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PACTOR is a radio modulation mode used by amateur radio operators, marine radio stations, military or government users such as the US Department of Homeland Security, and radio stations in isolated areas to send and receive digital information via radio.[citation needed]
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PACTOR is an evolution of both AMTOR and packet radio;[1] its name is a portmanteau of these two technologies' names. PACTOR uses a combination of simple FSK modulation[citation needed], and the ARQ protocol for robust error detection and data throughput.[citation needed] Generational improvements to PACTOR include PACTOR II, PACTOR III, and PACTOR IV which are capable of higher speed transmission. PACTOR is most commonly used on frequencies between 1 MHz and 30 MHz.[citation needed]