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Lisa worked diligently to help track down the point of corruption in the Hum Map. Thank you! I’ve reverted to a previous version and I am rebuilding the Map. Stay tuned.
This could end up being fairly serious. I can’t do this by myself – the Hum Map is too big now. Please download the raw, live database in Excel format (replete with all the duplicate entries, spam, and abuse). Then, download the Hum Sufferers Database in Excel. Then, pick a random entry from the Hum Sufferers Database, and then go find the original entry in the live database. Compare the two, and check that every column is correct. I am particularly concerned about the entries from 15, 000 onward. If there are problems with previous uploads, then I have no choice but to take the entire Map down and rebuild it, which could take at least one month. If the problem is limited to the latest 1000 or so entries, then I can manage that with about 10 to 12 hours work. I need the Hum community to step up and help with this.
It is with considerable regret, and out of a sense of duty and transparency, that I report that the World Hum Map is not reliable at the present moment. The latest upload of 1000 points has combined and shuffled data between map locations. As such, no statistics should be inferred or computed until I can rectify this problem. I may need to revert to a previous version.
A sharp-eyed reader noticed that his data point seems to have combined his data with somebody else’s. If this is endemic in the latest upload, then this is bad news. I may need to roll back the Hum Map to the previous version. I would ask any readers whose map point was included in the recent update to take a good look at their listing and let me know if there are issues. I will audit, by hand, twenty or so random recent points, checking the raw live database against the Hum Map. This may be a single incident or a significant setback. I’ll keep you informed.
I went outside, about 30 feet away from house, turned on the device and turned in a slow circle. Look at the following screen shots of the resulting EM spectra. I’m wondering why the first strong line appears at 261 Hz. Also, note the transient but significant EM noise at around 10 Hz.
I am slowly learning. After hearing back from George G. regarding some initial concerns, here is a screenshot that shows me turning on the unit at t=5 seconds, then approaching an active wall outlet and rotating the device a few times. You can see the vertical axis here. This makes more sense. I’m surprised that the mains don’t dominate the spectrum, given that I am surrounded by it in this room and in this house. I’ll keep you all posted.