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Well, the app is very interesting, but, of course, it’s very wide-band. It picks up any EMF, so it doesn’t really work for tuning anything, even as a relative receiving meter. From any distance it’s hard to tell background from point of interest, except for larger power output.
E.g., the thing reports a normal in-house micro-Tesla here in the 40-60 range until you get right on top of a hot wire, and it really jumps up on close range power supplies. IOW, you can find sources of EMF in your walls, or close to the ‘ON’ switch of your TV or computer, etc.
Too bad, I was hoping. Since other apps that also use the magnetometer can calculate expected field strength for given data input such as frequency, power output, antenna gain, distance, etc., I’d think there must be a way to isolate and continuously output some form of FS at narrower frequency ranges with some measure of selectivity and sensitivity…probably just hasn’t been done yet.
BTW, the chimney mount B&T hardware must be picking something up from local power lines because the steel tightening bands don’t show much, but the tightener hardware, especially the upper one, jumps from about 50 or so up to as much as 160 right next to it, drops off immediately on either side of it. The bottom one jumps up too, but only about half as much as the top one. Pretty much inexplicable…the only reason I can come up with is that the mass of the crank tightening gear is greater than the metal bands, and that the upper one is more on the horizontal plane of a high voltage power grounding line about 25 feet away, than the bottom one. Still doesn’t make much sense, though…a bit of a mystery, hard to solve.