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/
Type
Wave (.wav)
Duration
0:24.434
File size
339.8 KB
Sample rate
7119.0 Hz
Bit depth
16 bit
Channels
Mono
Comments
8 years, 8 months 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.
