I’ve seen various kinds of problematic FT8 signals that I think I understand -- “barcode” harmonics etc. – but what is going on here:
[image: multiple decode.PNG] The “blackbox” station there (call elided, no need to name names) has multiple sidebands on his main signal, some of them strong enough to be separately decoded, all at multiples of 60 Hz. What is causing this? Inadequate power supply filtering? Pretty sure it’s not in my receive chain; I see many signals stronger than this +12 dB one that are perfectly clean. 73, Paul K6PO
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