this post was submitted on 16 Nov 2023
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My guess is a cap gone wild in some tank circuit, hence the timed sounds (cap charge/discharge cycle).
Probably not, tank circuit (aka LC resonant circuit) capacitors are low capacity and charged/discharged at the carrier frequency, not every second. And those are pretty reliable kinds of capacitors (polypropylene, usually).
Are you suggesting my receiver is defective? I think it isn't, I was able to pick up a Hungarian MW station (otherwise AM has been shut down in Central Europe).
The audible sweeps seem to be purposefully coordinated, each is shifted by a constant amount. And why would anyone be broadcasting a 5300 Hz beep? (Or a pure sine wave at two frequencies separated by 5300 Hz, which AM receivers would interpret as this beep.)