JP.Diggzzit Posted September 12, 2018 Share Posted September 12, 2018 Hit this deep, 10 gram Platinum ring on the beach recently. Initial signal was a faint, choppy tone, jumpy 12/13 ID. After the 1st and 2nd scoops the signal went to negative #'s and gave me the iron tone. After the 3rd scoop the signal was gone. I utilized pinpoint mode thereafter and recovered the target after the 5th scoop. Solid 13 out the hole. Wet sand was hard packed so I don't believe the target was moving or sinking, no water filled the hole. Has anyone else experienced an initial good target going to negative #'s/iron readout? Halo effect on non-ferrous? Positive this target was at the brink of detection range...14" - 15" inches. Impressive depth but I will not trust that iron reading/tone if it is mixed with a positive reading/tone going forward. I run Beach 2 with no discrimination almost exclusively on the beach. GL & HH! 2 Link to comment Share on other sites More sharing options...
NSC Posted September 13, 2018 Share Posted September 13, 2018 Hi, Nice ring, congrats.? Signal gone : I think a lot of beach and soil hunters have have this happen. I can put my hand up. I think they call it " disturbing the coil inductance" and sometimes also "the halo effect" Once a hole is dug in moist ground it upsets the way the detector reads the ground and the target disappears Basically, as you found - the target is still there and to keep digging deeper I remember reading a properly explained answer to this recently but I now cant find it...maybe Steve can help ? Negative numbers & Jumpy numbers (on good non ferrous targets) you often get right at the edge of the detectors depth capability Happy swinging ? 1 Link to comment Share on other sites More sharing options...
midalake Posted September 13, 2018 Share Posted September 13, 2018 Two questions. Were you in Auto Ground Balance? Also did you try all metal mode? Dave Link to comment Share on other sites More sharing options...
JP.Diggzzit Posted September 13, 2018 Author Share Posted September 13, 2018 Yes, auto ground balance - 0. I only use tracking on occasion when gridding from drier sand to wet/water. No discrim./all metal, relatively clean beach w/minimal targets. Hit three deep lead sinkers before the ring, so I knew the possibility of a deep ring was good. I have had targets sink and move around in the soupy sand but in this case it was hard packed. Link to comment Share on other sites More sharing options...
NSC Posted September 13, 2018 Share Posted September 13, 2018 Some people talking about disappearing target on Findmall forum Equinox page I hope its OK to refer to that and put a link...if not please feel free to delete this Steve ? Link deleted since Findmall Forum update broke all old links and another from Gary Draytons site http://hardcoretreasurehunting.blogspot.com/2015/08/disappearing-signals.html 1 Link to comment Share on other sites More sharing options...
Jackpine Posted September 13, 2018 Share Posted September 13, 2018 I get those faint choppy tones in fresh water quite often. What experience has taught me is that if it initially reads a fairly consistent set of numbers as yours did this is a must dig. They may very well be targets that are at the edge of the machines ability to give a non-ferrous TID because of their depth and the act of scooping moves them just enough to fall out of that range. As others have noted, quite often there are ferrous indications in the tone as well but the numbers usually don't lie. 1 Link to comment Share on other sites More sharing options...
Darwoody Posted September 13, 2018 Share Posted September 13, 2018 This happened to me the other night at the beach. Feint, choppy signal (deep), so started scooping frantically as I was in the wash zone of the beach. Lost the signal at one point, but, using pinpoint, a couple of deep scoops later the target must have moved up in the sand (but not in the scoop, just off to the side) and gave a solid 12 signal. Before I could get the scoop back in, the waves/wash hit and the signal got softer and softer, then disappeared (unfortunately the waves didn't).I couldn't scoop quick enough in the loose, wet sand and lost it. Bugger! What could have been! ? 1 Link to comment Share on other sites More sharing options...
Chase Goldman Posted September 13, 2018 Share Posted September 13, 2018 Pure Platinum has a specific conductivity less than iron, but metal mass not just conductivity and of course total target alloy composition and orientation of ring targets will affect VDI and the latter especially can cause VDI variations during recovery. 2 Link to comment Share on other sites More sharing options...
Alluminati Posted September 13, 2018 Share Posted September 13, 2018 It was typical of the Excalibur to iron out on the deepest targets while running discrimination, particularly targets with already lowish conductivity or small in size. Typically offshore targets were located in all metal mode, then some sand would have to be removed to get a good sweep with discrimination. I don't know what the Platinum should behave like, but having a bit of nulling out on deep targets isn't a huge deal as Minelab multi frequency machines typically hold numbers deeper then any other brand. I haven't tried a All Metal mode with this machine in the water yet, I assume I'll be using one of the Gold modes. (The horseshoe button probably doesn't increase depth like running a more traditional all-metal mode would) 1 Link to comment Share on other sites More sharing options...
Chase Goldman Posted September 13, 2018 Share Posted September 13, 2018 Gold Mode in fresh water perhaps but it is unusable in salt water, FWIW. 1 Link to comment Share on other sites More sharing options...
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