I'm making general assumptions that your detector has any functionality I list below. These are specific to how I would approach with an equinox 900
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Anytime I got close to the house, detector went nuts. So I tended to widen that perimeter. Did not try lowering sensitivity at first.
Simply interference, electrical in walls, grounding rods, etc...
In addition to sensitivity, adjust recovery rate down. Cut it a level or two but you'll need to slow the swing as well. Also, ground balance again right next to the house and try to manually walk thru different Noise cancellation frequencies (as opposed to automatic)
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Always got lots of low tone/number hits everywhere with depth showing pretty deep. I dug the first half dozen, finding nothing. Thereafter I chose to simply ignore those hits. Occasionally I'd lower sensitivity to quiet the detector.
Filter them out. If you know your VDI numbers then pick a target range and try some test sweeps just for that coin. For example,
Barber dimes on a NOX 900 will ring from 80-84. A good solid 82-83 on a 360 target walk around and you can almost guarantee it will be a silver dime. Any time I am in a noisy environment I will minimize what I am looking for - it helps immensely. You can always sweep again with different VDI numbers.
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Did use headphones but kills my ears. Need to find a smaller set.
Personal choice. I'll only use if peripheral noise is bothersome.
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Upon getting a good tone, dig out a plug. Recheck hole and plug to see if the item is out of the hole. Constantly setting detector aside, dig hole, stand, recheck hole/plug, put detector aside, stand, repeat. What a pain in the butt. No hand-held pointer yet but one is in the mail.
Handheld is a must. What I also use is an N52 magnet that I attached to my digger. You'd be surprised at how helpful that can be.
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Detector sometimes seems to lockup. so I power down/up to clear it.
RMA - what brand?
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No plan yet to find my next location but I do know how to locate property boundaries (and owner's names) in my area and have a few areas to ask for permission to search. Just not sure if I'm ready to take that next step given the poor success I've had thus far.
Practice makes perfect. And most importantly, practice cutting the plug and replacing without any visible signs you were ever there. Whether a day later or 3 months later. With maintained lawns a big mistake people make is cutting an entire plug out of the ground and removing it....NOPE. You have likely just killed the grass. You have to cut a U-shaped plug and fold the plug back over the uncut portion. By leaving the contact point intact the plug grass is still connected to the ecosystem. Nutrients and moisture will still pass thru the uncut portion.