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Disappearing Signal

C

chuckciao

New member
How many times has this happened to you? I get a good and reasonably deep signal, pinpoint and then dig a plug only to find out that the signal is gone. I use the pinpointer to determine if the target is on the sides of the hole, dig a little deeper and keep checking with the pinpointer and if I do not get a signal, check with hole with the detector but the signal has vanished. I also check around the hole to see if the target is laying outside on the surface (which has happened a few times). After I replace the plug, I check for a signal again only to find signal is back. A few times, I have re-dug only to find nothing. I wonder if this is a ghost signal from a rusted object? Anyway, I would enjoy hearing if anyone has had similar experiences and suggestions about why and other steps to take to locate the target.
Thanks
Chuck
 
Yep, I've had that happen. I'm not sure if maybe the mineralization is different before you dig and once you pull the plug up it kind of breaks something up that can no longer be scanned the same way as when the plug was still in the ground.

I've also had it when the soil is dry and I've flipped a coin out of the plug and it ended up a few feet away from the plug only to find it once I've moved on.

I have days that I've pinpointed with my coil the same way I always do and once I dig the plug the signal starts to move and I find myself digging further in one direction from what I know was the exact center of the signal. I can only think that it has to do with other properties in the soil in or around the plug.
 
This has happened to me as we'll and I began to question my pinpointing technique!

I have days that I've pinpointed with my coil the same way I always do and once I dig the plug the signal starts to move and I find myself digging further in one direction from what I know was the exact center of the signal. I can only think that it has to do with other properties in the soil in or around the plug.[/quote]
 
Yes I have had this happen, just today in fact. Had a strong 42 , x'd it and pinpointed it, same technique I always use, dig the plug and...nothing with profind, run machine over hole and plug, nothing. Put the plug back run coil over again and still nothing. I just scratch my head and,move on. I have noticed it normally happens in 1 section of a park I go to frequently so I am guessing there must be some electrical interference going on, because 999 out of 1000 times there is something in the hole normally a pull tab :yo:
 
mapper65 said:
Yep, I've had that happen. I'm not sure if maybe the mineralization is different before you dig and once you pull the plug up it kind of breaks something up that can no longer be scanned the same way as when the plug was still in the ground.
Click to expand...
I've encountered hot clods before. The pinpointer even sees 'em right up until you've powdered the entire clump...then nothing. I will say however, that those signals weren't sharp like coin signals, but more like it could be something deep, and maybe good, so I better dig it to be sure. I should know better, but I can't help myself. The old Bullfrog & Scorpion story.

mapper65 said:
I've also had it when the soil is dry and I've flipped a coin out of the plug and it ended up a few feet away from the plug only to find it once I've moved on.
Click to expand...
Yep! That and finding it stuck in the dirt on your Lesche....I had that happen today.

mapper65 said:
I have days that I've pinpointed with my coil the same way I always do and once I dig the plug the signal starts to move and I find myself digging further in one direction from what I know was the exact center of the signal. I can only think that it has to do with other properties in the soil in or around the plug.
Click to expand...
Most often when a target isn't at least close to where it pinpointed, around here it's usually rusty iron. We all get sucked in by it. You have to dig it. But if my hole wanders too much, I can pretty much bet it's junk. I think that it has to do with substrate makup and the ease with which metals like iron, zinc, and maybe even aluminum oxidize and leach into the soil.
 
Glad to hear its not just me.....................
 
I believe that many ghost signals are caused by microscopic amounts of rust residue left over in the soil from very tiny iron targets that have rusted away to nothing and once the soil is disturbed the signals seem to disappear because of there being such a small amount of rust residue to start with. I rarely get ghost targets anymore and believe the main reason is that I run my sensitivity lower than in the past because of finding that using too high of a sensitivity can cause you to miss as many good targets as it helps you find..
 
Mtnmn - Interesting info. Never even considered too much sensitivity. Still it bothers me when I get a really good tone on this type of signal.
Wish ML would utilize some analog tech in their MD's. Perhaps like the old Whites-95% of hot rocks and good potential false signals could be eliminated by hitting the depth trigger.
 
it was your disc it ppens to me just tur the discrimination off and you will find the target... trust me
 
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