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The ARRL widely distributed Morse code training tapes along with the book "Tune in the World with Ham Radio" in the 1970s and 1980s. (The first tape had an introduction by Jean Shepherd K2ORS, which I remember well from having heard it many times.) I got my copy around 1978, and I seem to recall that the tapes used tones of about 700 Hz. Surely ...


I found a comment on the web that the U.S. Army used 641 Hz for their radio operator Morse Code training.

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