You can hear this kind of bleeps frequently in the Twente online receiver. They are caused by atmospheric phenomena.
recorded from the Twente university online radio tunner
http://websdr.ewi.utwente.nl:8901/
Type
Wave (.wav)
Duration
0:00.054
File size
858 bytes
Sample rate
7119.0 Hz
Bit depth
16 bit
Channels
Mono
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920 x 245
481 x 86
375 x 30
