I was on 40m #JS8Call when OH8STN sent Heartbeat message from few kilometers away. It was overwhelming my RX and I managed to catch a screenshot.
His message was sent on frequency 889Hz, but we can also see signal harmonic on 1778Hz (2 * 889Hz) and 2667Hz (3 * 889Hz).
Also notice how the width doubles on 2nd harmonic (1778Hz) and triples on 3rd harmonic (2667Hz).
Maybe this doesn't have any other point, but to show how harmonics look like on waterfall.
This is the original screenshot, but since it doesn't fully show the 3rd harmonic I waited for new message. But this one matches the numbers in the first message.
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