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Morse code, which hams call CW, sends text as patterns of short and long tones, dits and dahs. It is the oldest mode in radio and still one of the most used. A CW signal occupies a tiny slice of spectrum and can be copied by ear when it is barely above the noise, so five watts of CW is a serious DX signal. No US license has required Morse since 2007, yet clubs such as the Straight Key Century Club, CWops and FISTS keep the CW segments busy. Read more…