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I foudd this frequency, between 4450 and 4475 KHZ whilst going through channels on radiosdr.org.
It sounds a bit like a printer and then lower down sounds like a laser. Sorry for the sound of me pressing the keyboard, my laptop has an internal microphone so this was picked up.
Type
Mp3 (.mp3)
Duration
0:47.405
File size
1.1 MB
Sample rate
48000.0 Hz
Bitrate
197 kbps
Channels
Stereo