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Garrett AT Pro need help.

J

Jeff Calzarette

New member
I have a question for Garrett AT PRO users.
I keep getting signals in 80's that turn out to be rusty nails and every time a get a 98 or 99 to it a deep large nail. Is this normal or am I doing some wrong? Is my machine not working properly? I thought these signal should be silver but they are not. Any help would be appreciated.

Thank You,
Jcalz
 
It is normal. Signals in the high 90's tend to be iron. The rusty nails can sound like good targets, until they are disturbed in the ground and their halo gets broken. I am guessing that you are using a DD coil also, as they more often then not can read a rusty nail or bottle cap as a coin signal. That's one of the reasons that I prefer to use concentric coils.
 
I think there something wrong with your detector. Nails usually comes in around 30 to 40 never in the 80's. Also I have never found any silver at 98 or 99. When the number is that high it's usually a sprinkler head or huge pipe. As for DD, in my opinion DD you can read bottle caps and rusty nail way better than concentric....sorry John that in my own experience.
 
Throw some coins out on the ground. Ground balance your detector.
Try and detect the individual coins if you get lame readings there might be something wrong
With your detector or coil

VDI's should br

Penny's 67-82
Nickels. 48-53
Dimes 81-.82
Quarters 85-88
Halves. 88-92
 
I don't recall digging rusty nails in the penny, dime range, either. Usually much lower, and typically a very broken signal and quite often just a grunt. A rusty bottle cap once in a while sounds and reads good, but once some dirt is removed it reveals itself for what it is. Upper 90's readings are usually something big and or made of something like pot metal. i am not a concentric coil fan myself for my kind of hunting (in the trash) and DD coils do a much better job of handling mineralized ground. Like sparkster said, test some targets for proper i d. Good luck! HH jim tn
 
Hey Jeff, nice to see you on the forum. I can offer a couple ideas. I run mine in Pro Zero wide open or pro custom with the iron disc varying at 35 or 40. I've found running it at 35 helps sniff out gold chains but thats not what your post is about - just my set up info.
* After you ground balance over a clean spot take a look at the GB number by pressing the GB button. Here where we both live in "our soil" I've seen the GB numbers from high 80's to low 90's. Most frequently 89-91. The accuracy of the ground balance can have an effect on the target ID. I'd be suspicious if you see GB numbers far off from what I indicated.
* do the numbers jump around on those targets that turn out to be deep nails? Or do the numbers seem to lock on? Also walk a round the target and make passes over it (with iron audio on) from different angles. Making sure you pinpoint each time before making short passes over the target.
* how deep are you referring to? If you are digging nails that read solidly as coins at less than 6" then there may be an issue with the unit.
I will just for refernce mention "target wrap" that I have expirienced on another brand of detector. That can be a bad iron target that "turns the corner" on the target ID scale and registers high in the coin ID area. Or even a good target that dips into the negative or iron numbers. The actual phase of the ground, the point of GB all have an effect. I haven't really seen at all on my ATPro. I'll spare any longer explanation of what it is (some can express it better than I) but if another ATP user has had that happen to them then we can look at ways to recognize that.
There are many sensitive high end detectors that can occasionally give a seemly good coin signal over a deep rusty nail. But there are often telltale signs that vary by model that it may not be a good target. One good thing is we should be able to meet up when the ground is digable and compare notes in person. The few times I dug deep nails with my ATP the audio was not as clean and the numbers were jumpy. Wish I could be more help here, I keep thinking ground balance though.
HH - Bruce
 
Hey Jeff, nice to see you on the forum. I can offer a couple ideas. I run mine in Pro Zero wide open or pro custom with the iron disc varying at 35 or 40. I've found running it at 35 helps sniff out gold chains but thats not what your post is about - just my set up info.
* After you ground balance over a clean spot take a look at the GB number by pressing the GB button and releasing it. Press it again to exit. Here where we both live in "our soil" I've seen the GB numbers from high 80's to low 90's. Most frequently 89-91. The accuracy of the ground balance can have an effect on the target ID. I'd be suspicious if you see GB numbers far off from what I indicated.
* do the numbers jump around on those targets that turn out to be deep nails? Or do the numbers seem to lock on? Also walk a round the target and make passes over it (with iron audio on) from different angles. Making sure you pinpoint each time before making short passes over the target.
* how deep are you referring to? If you are digging nails that read solidly as coins at less than 6" then there may be an issue with the unit.
I will just for refernce mention "target wrap" that I have expirienced on another brand of detector. That can be a bad iron target that "turns the corner" on the target ID scale and registers high in the coin ID area. Or even a good target that dips into the negative or iron numbers. The actual phase of the ground, the point of GB all have an effect. I haven't really seen at all on my ATPro. I'll spare any longer explanation of what it is (some can express it better than I) but if another ATP user has had that happen to them then we can look at ways to recognize that.
There are many sensitive high end detectors that can occasionally give a seemly good coin signal over a deep rusty nail. But there are often telltale signs that vary by model that it may not be a good target. One good thing is we should be able to meet up when the ground is digable and compare notes in person. The few times I dug deep nails with my ATP the audio was not as clean and the numbers were jumpy. Wish I could be more help here, I keep thinking ground balance though. If you are at the next club meeting we can talk about your expireince.
HH - Bruce
 
Hello Bruce,

Thank you for the info, when I find some soft ground I will have to play with the GB some more. I have had some problem nails jump around a little but no more than most coins. The depth can vary from 5 to 10 inches (very large nails). I do not get a locked or steady number on good targets unless the item is right at the surface. Hopefully the "2-3 ft" of snow will melt quickly and we can get out and hunt. I would like to have you try my machine and see how it compares to your, if you are willing.

Thank you again for your help.
Jeff
 
A aaargh! :throw:My post went UP twice - sorry! Jeff, I'll be glad to try your ATP. I can show you what I mean referring to ID numbers that are tight / lock. An example would be a small spread of say 3 numbers, like 79 to 81 on a target several inches down on a target that would read 80 in an air test is pretty much a lock to me. Pinpoint then a small wiggle dead nutz over the target will give you the tightest visual ID on a single, isolated target. As the targets get deeper the spread of numbers can be greater or jumpy on a coin sized target. This is common on target ID machines and you will develop a feel for it, looking at consistency of the numbers and spread. In the end it's you and your digger that has the last say. I don't pass up deep targets on visual ID alone. Sound and size of the area it pinpoints matter to me.
We can compare your ATP to mine to see if there is an issue.
HH - Bruce
 
I usually dig any target that is not in the iron end of the scale, but is repeatable. That is why nail are so frustrating because they should read as iron and some places I go there are hundreds of old nail. I guess I am still learning this machine (slow learner), I have had is since August and have made some great finds so I can not complain.

Thanks again for your help.
Jeff
 
Jeff, when you are in an iron patch - lots of nails and ferrous junk do you have the smaller coil to use? If you are getting multiple targets under the coil it's easier to miss something. Not so much as to address your original target ID question but for easier work when targets are good together. If you have some yard space try plantng a few targets at known depths in the springtime. I practice that way with my detectors to learn how settings, targets, depths and nearby trash influence the signal - both audio & visual.
HH - Bruce
 
Bruce, I only have one coil at this time, but a small coil is on my wish list. The three places that I hunt that have a lot of nail where this is my biggest time waster have a lot of space between targets so I do not think coil size is the issue. There are trashy places I go that I would love to have a small coil to use for separation of targets. You mention practicing in the spring, which I will do. I just want to know when is that going to happen, it has just finally stopped snowing. I think I will have to go to the beach soon so I can do some hunting.

Jeff
 
I may have missed it but did not see anyone post about using the iron audio. Works great on those signals that appear to be good but just not quite right.
 
I have had this issue with and without iron audio on. If the snow goes away and the ground thaw out it am going to try everything that has been suggested and hope for the best.

Thank you for your suggestion.
jeff
 
I have been detecting for years .I use a lot of different detectors and have the same problem.The ferrous objects that are very deep will give everybody problems . Also, these ferrous objects tend to bleed the surrounding soil.
The more experience you get with the AT Pro, the better you will become. For example: swinging the coil from multiple directions over your hit. Also , make sure your iron disc is set to the max. Remember if your relic hunting you will need to adjust this back.
call me any time
 
Are you certain they are iron nails? Brass or Bronze finishing nails ring in high.
 
at one point on this forum someone had posted what the typical numbers represent. If someone has them can you re-post? I may have a copy laying around somewhere.
 
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