The FCC approved the use of ASCII by amateur radio stations on March 17, 1980 with speeds up to 300 baud from 3.5 MHz to 21.25 MHz and 1200 baud between 28 MHz and 225 MHz. Speeds up to 19.2 kilobaud was authorized on amateur frequencies above 420 MHz.
the fcc ApprovED thE use oF ascIi bY AMAteur radIo StatiOns on mARcH 17, 1980 wiTH SpeedS uP to 300 bAUd frOm 3.5 mhZ to 21.25 mhz And 1200 BAUd BetweeN 28 Mhz ANd 225 Mhz. SpEeds Up To 19.2 kIlObaUd was AuthORiZed ON Amateur frEqUEncIes above 420 mhz.