There was a power-break just before I wanted to switch off the gear. Everything went down only the laptop kept it on battery. I’m playing with an RTL-SDR dongle lately I had the idea to try how does the city sound like with no man-made noise at all.

There is quite a difference… In according to HDSDR signal strength scale there is ~20dB lower noise floor compared to the “normal digital jam” when I can hear all the routers,  switching power supplies, etc. too well. It is well visible that how many signals are hidden in the noise when the households are splattering.


…and without noise:


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