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First transatlantic two-way contact between amateur radio operators

Date(s)
November 27, 1923

During World War I, all amateur radio operation was banned. After the war ended, service was allowed to restart on October 1, 1919.

Leon Deloy, in France, communicated with Fred Schnell, in Hartfort CT, in November 1923, after visiting America earlier that year and building a special transmitter when he returned to France. According to accounts of the event, many other amateurs were listening into this transmission as it occurred.

Sources
https://medium.com/@carcbradio/celebrating-the-first-transatlantic-qso-c25ee3ea4e4e
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