Speakin' of weird stuff, I keep hearing what sounds reminiscent of our old USSR pal Woodpecker here & there?
Any comments?
Yes, I have noticed this too, though in my case(s), it came down to the receiver mode selection and the passband at the time.
I could see in the waterfall display that the signal was frequency sweeping, perhaps like the coastal radars that are used to track tidal flows and the sweep rate, TX bandwidth and RX bandwidth were just right to make a pulsating sound like the woodpecker in the 1970s-80s while listening in AM mode. If you changed RX mode on the receiver to say USB, it would sound completely different though. It definitely was not the woodpecker. The woodpecker didn't have much frequency sweep rate. (I didn't have a waterfall frequency display in those days but I don't believe that there was much sweep, if any, to the woodpecker.)