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A comment on There's a Persistent Hum in Windsor, Ontario, and No One Knows Why. Parent comment

Re:There's a Persistent Hum in Windsor, Ontario, and No One ... by mindcrime on Tuesday February 20, 2018 @09:30PM (#16426384)
It does require synchronization of the recordings, which might also be difficult.

Could you record with a multiple "microphone connected to a Raspberry Pi" setup, with the time synchronized using something like the NIST time signal[1] using an RTL-SDR, or a cellular signal, or GPS, or maybe using NTP?

[1]: https://www.nist.gov/pml/time-and-frequency-division/nist-ra...

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Re:There's a Persistent Hum in Windsor, Ontario, and No One ... by rocqua on Wednesday February 21, 2018 @06:20AM (#16428643)
Yes, that seems like the best approach. At 20Hz waves, ntp would probably be good enough. The real issue I can see is to get that time-data into the sound data. Maybe you could time-stamp the beginning of a recording, and start a new recording every minute (to compensate clock drift). That might work, biggest issue I see is potential variable latency between 'starting a recording' and the actual first recording happening.
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