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Pedlar mills

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Many of the sites I hunt will have a whole lot of -6 to -9 readings when having a gain of 18 and above. Is this the mineralization in the ground making the detector false? If so should I drop sensitivity even further until the readings stop? Just curious because I half way thought I remembered Steve h saying something along those lines

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44 minutes ago, Pedlar mills said:

Many of the sites I hunt will have a whole lot of -6 to -9 readings when having a gain of 18 and above. Is this the mineralization in the ground making the detector false?

Have you done a (auto) ground balance?

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3 minutes ago, Pedlar mills said:

I have ground balanced the detector...

You didn't say where you are located (a state would at least give us some idea if you might have highly mineralized ground).  Hot rocks will give those very low negative readings.  But in some sense variable ground is a lot like hot rocks so maybe you already pegged the cause.  Check for repeatability.  That is, do the locations of these negative signals appear like real targets or do they seem to move around?

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A hot rock by definition is different than the ground around it. You balance to the general ground content. The rock has different properties than the ground, so it beeps. Or you ground balance to the hot rock.... now you are out of balance with the general ground. So if you are balanced to the ground, and there is a rock that beeps, you can either lower sensitivity until it stops beeping (hot rocks usually fade far faster than metal objects when sensitivity is reduced) or you can leave sensitivity high and notch them out. Certain single frequencies may also eliminate them. There is no rule per se since hot rock situations differ.

This is the realm I normally live in and so go into it all in detail in the following threads....




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Thanks for the replies! I am in Amherst county Virginia near the Appalachian mountains. My only concern was that it was potentially going to mess up detector response on good targets if I had gain up to high with the ground/hot rocks feed back. Thanks Steve I will read those tonight

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Just curious.... what are the hot rocks reading on the Nox?   Most machines they wrap around to a very high digit/area which like Steve said can be notched out.   That was your GB.... not your noise cancel?   Have you tried using tracking..... even for a few swings to see if the ground is changing a lot to get a feel for what it should/may be reading?  Again, like Steve said you may need to change a setting ..... IB, Recovery, or reduce the sensitivity... which ever will reduce the sensitivity the least to just those rocks or notch um.

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Ground balance in this area is normally 66 or so on the equinox, I have not tried tracking but will next time I go. Don't think I'm having that much problem with wrap around it does false a lot but that seems to be just iron falsing, once gain is dropped to around 16/15 or below the -6 to -9 readings will drop off some. What I was concerned about is if I keep the gain up and all metal off so I don't hear those negative readings  and go over a non ferr target will the ground noise I know is there cause a target to be undetected? 

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My problem seems to potentially have gone away. I was going to the spot I detect when I only have a hour or 2 to swing, this spot is one of the places I got a lot of -6 to -9 readings. Before I left the house on a whim I swapped back to the original software and then reloaded the update. When I started to detect the super low negative readings were gone all I was getting was repeatable -1 through -4 readings that I could actually isolate. On the whole the machine ran much smoother and not random acting like before. So not sure what happened the first time I updated but very happy with performance today. Found 2 no date standing liberty quarters and a wheat. The quarters had stars under the eagle but no box for the date so have to be 1917 through 1924 I think. Going to be interesting to check some of my older house sites now that the nox seems to be running correctly 

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