Periodic beeping. Does not seem to be a data transmission as it it is a simple beep-beep-beep... pattern. There is another sound (kind of a humming) but that seems to be a different signal overlapped to the beep.

Maybe a satelite telemetry signal or a transponder?
The file name indicates the date, time and frequency.

Recorded from the Twente University online radio receiver.
http://websdr.ewi.utwente.nl:8901/

Comments

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  Bippwatt 2 years ago

  Almost positive it's Morse code. In the background, kinda. If you kinda mentally block the high pitched beeps, then isolate the low hum, there are a series of low...beeps, I guess, which seem to be arranged in a fashion similar to morse code.

  You might have stumbled onto some sort of Morse equivalent of a numbers station.

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