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Numbers have changed...

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grumpysrb

New member
I went hunting Wednesday wit a buddy, also using an ATP. I was getting an incredible amount of chatter and he was not, his ATP had some, but not like mine. Today I noticed the vdi numbers for coins has changed. The different pennies used to ring up differently, but were all in the seventies. Now a older copper rings in at 80, as does a dime, which used to come in at 81/82. Quarters used to come in at 86/87 now the come in at 84 to 88. The bent quarter I found today jumped from 84 to 90. Junk has become harder to pick out as well as the numbers for pull tabs has changed too.

What would cause this and can it be corrected by me?
 
A solar flare was seen on the sun several days ago. Today and tommorrow night you should be able to see the Northern Lights if the coditions are right. Who Knows !!!!
 
I am having the same problem. What's going on with my machine. Very frustrating. I had dimes and pennies hitting the 85 mark. Any help, guys?
Les
 
Make sure your batteries are good. Sometimes a detector can act erratic with weak or weaker brand batteries. Also it could be the cross frequency talk from 2 At Pros .even though there is a frequency changer on the At Pros . Not sure if you change frequencies Also make sure your coil is clean if you have a coil cover and make sure all connections are tight and clean. Other than that service might be needed . Good luck. Oh and grease the seal where the batteries are with divers silicone every so often so the battery compartment doesn't catch water. .
 
Ditto on Trackerman. Maker sure your coil connections are tight and wire is snug around upper and lower shaft.
 
I am going to check my coil cover. I did everything else. i was rinsing the coil off with puddle water. And it is very wet here. I think maybe some bits of iron may have gotten in the coil cover.
Les
 
Try running the cable wirer straight up the shaft to midway taping and leave a little play at the head. Midway rap coil three or four times around shaft and the connect to the electronic body of the AT Pro taping along the way. I do that on all my machines it may help.
 
After i clean the coil cover I will zip-tie mine to the shaft. That should work better maybe? i think today will be a maintenance day. cleaning the whole works. followed by some detecting of course.
Les
 
I checked the connections, tightened the coil cable a little more around the shaft, and checked the coil and coil cover. It had a small amount of dust in it. The batteries are fine, put them in about 20 hours ago, but they are lithium energizers, and I still have 4 bars going strong.


This chatter is something I have had trouble with in the past and seems to have gotten worse. I'm planning on sending it in to Garrett.
 
Did that to. Made no difference. I did that and everything else I could think of the day after hunting with a buddy who also has a ATP. Got out at a spot and turned it on. Got a huge amount of chatter, even if I held the coil up in the air. Thought It may be EMI so I did a frequency adjust, which didn't work. So, I ground balanced, no good. Checked the coil connection, reduced the sensitivity one then two bars (which seemed to help a tiny bit) but what's the point of having the depth if you can't use it. I tried everything and then reset. That didn't help either. So I began to detect and a few seconds later the chatter dropped down to normal, but increased quickly and I just worked around it. Beside the changes with the vdi numbers the chatter has made it difficult to tell the difference between a coin and a bottle cap, the tone roll is impossible to hear, or I get a tone roll for coins like a zinc or quarter.
 
Assuming you haven't damaged the detector from too high voltage batteries, when the targets do not ID correctly that is a sign to check the ground balance. The hotter ground you are working the more important it is to get a good ground balance. Now that Spring is here, the wet ground will magnify things and also require an accurate ground balance. Sometimes every ten feet. Or like they say for nugget hunting, balance after every sweep at first.
 
Been checking the ground Balance frequently. I noticed that at one spot it varies fro low 40's to mid-80's and changes frequently. So I check it frequently.

Aren't all double A batteries the same voltage?
 
The lithium battery thing, at least the older ones some were over 1.8 volts. To me, accurate ground balancing over clean ground is the most important thing you can do. I balance in All Metal mode but I have heard others just use Iron Audio.
 
These are 1.5v.

I'm going to try another site. Perhaps it's the one I've been hunting. I have been having to ground balance every few swings.
 
My guess is that you are now reading the coins at a different place, perfectly horizontal and with a different matrix (ground or air), perhaps at a place with some EMI. And they are now dry and maybe even cleaned. Any of these variables will affect the VDI reading.
 
My ATP read some pennies as dimes from day one, I just figured it was due to the varying amounts of copper in some pennies as compared to others and didn't think much of it seeing as how I was finding lots of coins. I have found more pennies than anything though.....no chatter when the coil is in the air from mine, maybe your coil has gone bad, Or the presence of power lines nearby affected it maybe? Hope you get the issue resolved soon man.
 
I can't tell. I put the smaller, 5x8, coil on today. Less chatter, but the VDI numbers were still off. I'll send it in with the large 8.5x11 coil and get it checked. I'm sure it isn't me. I was able to tell one coin from another before digging it and was digging less trash. I was able to pick the trash out from the good targets or vise versa, but am having a lot of trouble doing that now.
 
Previuosly I could tell a zinc from a copper penney, a penney fro% of the time, but I can't do tht m a dime and a quarter from the rest. Could tell can slaw from coins 99% of the time. I can't do that now.
 
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