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To make this sound I used the Twente online radio tuner (http://websdr.ewi.utwente.nl:8901/). I recorded as I changed the listening frequency and filter (bandwidth). The sound is only amplified.
Type
Wave (.wav)
Duration
1:00.000
File size
10.1 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Stereo