Man noise in these days

in these days I record a noise and i think about man-noise.

It is regulat of 5,50 minutes, maybe to 0.2Hz in frequancy.

What could be it?

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Hello Geobalocchi,

Does this happen all day long, or only between some specific hours? Or, does it appear only during working days and not on weekends (or vice-versa)?

This could clue us in on what could you be detecting.