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HF Mystery Signals / UNID Bell Oddity on 10401 kHz USB
« on: August 22, 2025, 1957 UTC »
Good evening everyone, I was scanning a KiwiSDR on the east coast of the UK when I came across a signal on 10401 kHz. It was 04:57 UTC at the time when the signal was active. This signal was active for a couple of minutes before slowly fading out and completely disappearing without a trace. The receiver was in USB mode in the recording.
The signal when seen on an SDR waterfall: it has a reverb to it and upon tuning to this signal, you hear a deep sonar like tone every 1-2 seconds. Eventually, it began to slowly fade out and at a point, it was barely audible before completely disappearing. I assumed it might have been a radio buoy of some kind, but I am not completely sure.
Here is a recording of the signal:
https://youtu.be/075rG69neyY?feature=shared
The signal when seen on an SDR waterfall: it has a reverb to it and upon tuning to this signal, you hear a deep sonar like tone every 1-2 seconds. Eventually, it began to slowly fade out and at a point, it was barely audible before completely disappearing. I assumed it might have been a radio buoy of some kind, but I am not completely sure.
Here is a recording of the signal:
https://youtu.be/075rG69neyY?feature=shared
