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I don't think its my ears and my wife hears it too. I guess it's at about 70 Hz? It's very constant in frequency and maybe I'm only hearing a harmonic of a lower one?

Took a little drive about a mile out and its still there, a good distance from any industrial buildings.

Drives me a little nuts.

My laptop and phone mikes don't seem to pick it up, I don't see any discernable peaks in the spectrum analyzer with Audacity.

Maybe there is a pump running somewhere, since we had torrential rainfalls since about yesterday. But to still hear it, almost two kilometers out?!?

I don't think its my ears and my wife hears it too. I guess it's at about 70 Hz? It's very constant in frequency and maybe I'm only hearing a harmonic of a lower one? Took a little drive about a mile out and its still there, a good distance from any industrial buildings. Drives me a little nuts. My laptop and phone mikes don't seem to pick it up, I don't see any discernable peaks in the spectrum analyzer with Audacity. Maybe there is a pump running somewhere, since we had torrential rainfalls since about yesterday. But to still hear it, almost two kilometers out?!?

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[–] • 1 pt

Thanks for the writeup. Might save me a lot of time if this perists. The hum has subsided, became intermittent and seems to be gone for now. I want to be prepared for when it returns.

Those pesky aliens keep moving around. Hard to find them that way. :)

Good idea re the scope, bought a Rigol 16 bit one some weeks ago, should do the trick. I have a Shure Beta 58A microphone left over from a project that didn't materialise. Not ideal but I'll start there, before investing into a different microphone better suited for low frequencies.

The Shure 58A should do much better than most common microphones. With the scope's sensitivity you should be able to see something show up. It will also help you get a fix on the frequency/periodicity of the hum and the scope may have math functions to help isolate or enhance it depending on the model. This setup should do well if the hum returns.

[–] • 1 pt

Just to correct my idiocy re scope. It's not 16 bit, of course. It's the 12 bit DHO924S. Cool bit of kit, nonetheless.