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Disappearing Signals

A

Anonymous

Guest
Just want others to confirm for me that you see the following:
Worked at a heavily worked site this weekend with considerable iron (square nails) in the way. On a number of occasions, I heard a high tone, relatively deep that disappeared after 1 or 2 swings. Machine nulled out over target but never gave high tone again, at any direction of sweep. Didn't dig any of those. Should I? I assumed they were deeper iron targets that machine chirpped on. I was running 26 sens semi-auto, normal response.
Also, on one spot, I got a good tone after several scans...but then it totally disappeared! No null, no nothing. I excavated anyway and found some charcoal wood from a fire. Is that normal?
Has anyone dug a 'disappeared' signal to find a good target?
Thanks and HH.
 
OK, let me try and explain <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)"> I have dug quite a few disappearing signals that were good, but 99 percent were good signals before digging, the ones that disappear before digging are generally trash. Once in a while I will get a signal that seems good at first, but is generally cause by having the coil too far above the ground, or surface trash messing it up. If your working a target you think has a chance, and is breaking up or nulling, make sure you get the coil as close to the ground as possible and if in leaves or brush or twigs, kick it out of the way with your foot to get that trash out of the way, after doing that the signal will either get better or worse, if better dig, if nulling solid forget it. If you got a good solid weaker signal or reading deep signal before digging and it diassapears a get opening the hole up a few inches, keep on digging, those arte usually the oldest nicest stuff <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT=":)"> there are always exceptions and sometimes a small response in a null from one direction is a good target near iron, so be carefull and listen to the audio while attacking the target from all directions..in time you will not feel bad about leaving targets in the ground, of course the other rule I follow is if the signals are sparse and I have time dig em all....Jim
 
As you have described it yes, that sounds typical of iron and I would pass them up too. Thing is I 'work'(analyze) a target before passing it up, initial nulling doesn't mean it's iron every time and the 90 degree test with the Explorer is an undependable way to make conclusions since a good number of my old silver coin finds failed miserably on the 90 degree test. I have pulled out some sweet finds that would 'null out' or had no signal when checked in one, two, or more directions but after circling the target and checking at multiple angles was able to get a faint but repeatable goodie signal in one direction side to side, a difinite dig --a high percentage of these have turned out to be good targets.
As far as disappearing signals, I've had what turns out to be goodies disappear in both all metal mode and detect mode, but either I had a good enough signal at least once to start with or would work it a bit more and get maybe one other good enough signal but either way it was enough to still dig. If I lose a signal that had only given nulling before it was lost then I will pass it up after working it a bit more and would move on.
Like Jim points out, keep the coil flat to the ground. I don't even think about it anymore when I get a signal that is weak it is automatic to use my foot to push away any debris so the coil gets good contact with the ground, every fraction of measurement that gets you closer to the target and to the ground really does makes a big difference. Also, I always keep the coil touching the ground when sweeping, I sort of compress the coil into the ground surface as I swweep along to ensure good contact(not enough though to put undue stress on the lower stem.)
If I only dug the better sounding signals and the signals that pass the 90 degree iron test then I would never have begun to develope an ear for knowing a junk signal from a good signal, there is a difference that you begin to recognize after digging more and more iffies.
GL
BTW,I have pulled out some semi burnt charcoal looking stuff that gave a good signal, not sure if it's actually charcoal and I think I've only found it once or twice.
 
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