Radio Relay Leagues
Radio amateurs have been early in arranging relay leagues, as is reflected in the name of the organization of American Radio Relay League (ARRL), http://www.arrl.org/.
Radio amateur message relay operations were originally conducted using Morse code in the first two decades of the 20th century using spark-gap transmitters. As vacuum tubes became affordable operations shifted to more efficient manual telegraphy transmitters, referred to as CW (Continuous wave). Messages were relayed station to station typically covering four or more re-transmission cycles to cover the continental United States, in an organized system of amateur radio networks. After World War II, voice and radioteletype implementations of the message relay system were employed.
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