List of Experimental Licenses Reveals Interesting HF Data Comm Experiments

Ham radio operators have been using the shortwave (“high-frequency” or HF) bands for data communications for over 50 years, but the data rates are much less than those available with dial-up modems. HF communications have the advantage that they don’t depend on vulnerable satellites, don’t require line-of-sight, and can cover huge distances under the right conditions.” 

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