ON7YD's test recorded at 0729UTC on 17 May 1998 on the 136kHz band. His 1.2-second dot period slow CW was undetectable by ear. In a one-hour test, this was the only time he was readable. Distance is 353km.
Display made on Spectrogram 4.1.2 for Windows 95. Frequency is displayed vertically with the lowest frequency at the top. Time is horizontal. Amplitude is brightness.