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Back when Morse code proficiency was required for certain radio licenses, what audio frequency was used by the exam tapes, equipment or examiner that generated the Morse code audio? Was there a legal or recommended testing standard for this audio tone frequency?

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  • $\begingroup$ Would this not depend on the location? Morse code proficiency requirements do. $\endgroup$
    – user
    Jan 7 '14 at 12:37
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    $\begingroup$ @Hotpaw2, please edit your question to be more specific and note a locale. As it stands now, there is no way to provide a canonical answer. $\endgroup$
    – WPrecht
    Jan 7 '14 at 13:30
  • $\begingroup$ I am interested in how Morse Code license proficiency testing was done in more than just the U.S., so the lack of locale specification was intended, although including this information in any answers would be helpful. $\endgroup$
    – hotpaw2
    Jan 8 '14 at 1:14
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    $\begingroup$ @hotpaw2 No one could possibly write an answer that exhaustively listed the tones used for testing everywhere. See discussion on meta: What should happen to regional questions that don't specify a region? $\endgroup$ Jan 8 '14 at 13:11
  • $\begingroup$ I do not require an exhaustive answer. $\endgroup$
    – hotpaw2
    Jan 8 '14 at 15:56
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Since you are in California, let's use FCC examinations. http://www.qsl.net/wj5o/mcode.htm said 600-800Hz and Wikipedia agreed. Also, a review of the FCC's First Class RT Licensing requirements did not state anything about pitch.

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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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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 the ARRL used a pitch similar to the pitch used in the FCC Morse code exams.

Some kind soul posted the audio from the tape in a YouTube video. Would someone please measure the pitch and post it in a comment? The pitch of the closest musical note will do.

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