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  1. Mar 2025
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    1. tonz 24 Mar 2025

      https://web.archive.org/web/20250324151639/https://en.wikipedia.org/wiki/Multiple_frequency-shift_keying

      Multiple frequency-shift keying MSK as means for HF (shortwave) text transmission as it's robust in the face of noise, weak signals and fading.

      shortwave textradio mfsk
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    en.wikipedia.org/wiki/Multiple_frequency-shift_keying