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Radio Propagation


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D-Region Absorption
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Created by PA4RM

December 11 marks the 98th anniversary of the success of ARRL’s Transatlantic Tests in 1921, organized to see if low-power amateur radio stations could be heard across the Atlantic using shortwave frequencies (i.e., above 200 meters). On that day, a message transmitted by a group of Radio Club of America members at 1BCG in Greenwich, Connecticut, was copied by Paul Godley, 2ZE, in Scotland.

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