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Old 05-29-2018, 12:15 AM
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Default AT Pro vdi question

Been detecting an 1897 yard. Not finding too much. I have been running 6x9 cool but switched to stock coil. Ground balance is regulating at 72-78. Iíve tried that but it is the lowest I have seen a gb so I have manually tried the 80ís. But my problem Iím having is my vdi numbers seem off. Clad pennies are consistently reading 88-93. With numbers like that, I will always dig. I did get 1 silver dime at 82. What is making pennies read so high?

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Old 05-29-2018, 12:20 AM
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Originally Posted by Mottz View post
Been detecting an 1897 yard. Not finding too much. I have been running 6x9 cool but switched to stock coil. Ground balance is regulating at 72-78. Iíve tried that but it is the lowest I have seen a gb so I have manually tried the 80ís. But my problem Iím having is my vdi numbers seem off. Clad pennies are consistently reading 88-93. With numbers like that, I will always dig. I did get 1 silver dime at 82. What is making pennies read so high?
Have you tried doing a factory reset? Not sure why theyíre reading so high?
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Old 05-29-2018, 12:24 AM
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I would assume that it because its not ground balanced right .. trust the machine to ground balance itself .. I have run into the same difference in soil .. used to running it around 80 .. one park I go to wants it at 65 ..all I can say is let it do its thing then toss a quarter on the ground and see what it ring up as .. . at least you will know

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Old 05-29-2018, 10:31 AM
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I have noticed that different coils on my Teknetic machines GB differently depending on the coil. I would trust the Auto GB

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Old 05-29-2018, 04:22 PM
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Thats too high for pennies????

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  #6  
Old 05-29-2018, 11:49 PM
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I have done the reset and let the machine balance itself. I have permission across the street in another yard so I will see this weekend how it turns out.

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Old 06-05-2018, 12:35 AM
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Did you try manually setting it in the 90's?

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Old 06-05-2018, 01:17 AM
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Originally Posted by Mottz View post
Been detecting an 1897 yard. Not finding too much. I have been running 6x9 cool but switched to stock coil. Ground balance is regulating at 72-78. Iíve tried that but it is the lowest I have seen a gb so I have manually tried the 80ís. But my problem Iím having is my vdi numbers seem off. Clad pennies are consistently reading 88-93. With numbers like that, I will always dig. I did get 1 silver dime at 82. What is making pennies read so high?
Is there a lot of iron trash on the site? That usually brings up my vdi. For example I had a small aluminum button ring up at 92 today because it was over rusty nails and can slaw was coming in from 70 to 85.

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Old 06-05-2018, 11:51 PM
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I tried manually setting in mid 80ís. I even went across the street to different property. It balanced at 72-74. Had a consistent 93 at 4Ē depth. 1989 penny. So I tried digging just everything. Had a back and forth 48/49 that ended up being a 1940 nickel. I am in awe as to what is going on. Maybe I just need new batteries? Heck, I donít know. Lol

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  #10  
Old 06-05-2018, 11:53 PM
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Originally Posted by BaldAssCat View post
Is there a lot of iron trash on the site? That usually brings up my vdi. For example I had a small aluminum button ring up at 92 today because it was over rusty nails and can slaw was coming in from 70 to 85.
Not too much. What I have dug for trash is by itself and I always scan again after the target is retrieved.

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Old 06-06-2018, 11:33 AM
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Originally Posted by Dragonfire View post
I would assume that it because its not ground balanced right .. trust the machine to ground balance itself .. I have run into the same difference in soil .. used to running it around 80 .. one park I go to wants it at 65 ..all I can say is let it do its thing then toss a quarter on the ground and see what it ring up as .. . at least you will know
Good post here. GB is my first guess.

Sometimes certain soils and EMI (ElectroMagnetic Interference) can effect readings. Hard to nail it down sometimes.

I find coins on the AT Pro often hit MUCH more "solid" than junk. I always dig solid hits.

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Old 06-06-2018, 07:14 PM
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Originally Posted by Big Boys Hobbies View post
Good post here. GB is my first guess.

Sometimes certain soils and EMI (ElectroMagnetic Interference) can effect readings. Hard to nail it down sometimes.

I find coins on the AT Pro often hit MUCH more "solid" than junk. I always dig solid hits.
I agree with solid hits. But, why is a penny reading 93?

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  #13  
Old 06-06-2018, 07:27 PM
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Originally Posted by Mottz View post
I agree with solid hits. But, why is a penny reading 93?
As I said ground balance being off would be my first guess. I have seen areas with lots of lawn fertilization and or minerals in the soil chew pennies up. This is especially bad on zincs and it changed the readings by several #'s

Some zincs come out of the ground looking like a tiny shotgun peppered them with birdshot.

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  #14  
Old 06-09-2018, 09:31 PM
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on the AT pro always do a factory reset after changing coils.

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  #15  
Old 06-17-2018, 05:26 PM
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Update on the problem. Had a seeded hunt this weekend and it wouldnít pick up a silver half at 6Ē. Messed with all settings with no luck. Did an air test. Here is where it gets interesting. Waved a silver half in front of it. It read between4-5. Placed a silver quarter in front of it. Came up 2-3. Silver dime was a loud 99. Showed that test to 6 different people and no one has any idea. Hope Garrett has a solution.

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  #16  
Old 06-19-2018, 10:39 AM
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Not to sound stupid another experienced hunter....but was there another coin in the hole?

When I get odd numbers with my ATPro or even the 3030 and I can tell it's a good(coin) target, usually there are multiple coins touching or nearby. Or something else in the hole/plug.

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  #17  
Old 06-19-2018, 10:55 PM
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These numbers are air test. Waving them 2Ē from the coil. It just is not picking up big silver but it is reading silver dimes at what should be half dollar to dollar and reading copper pennies at quarter range. Even in the field I always re-scan to make sure there is nothing else. The vdi readings are way off. Still waiting on email from Garrett.

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Old 10-24-2018, 10:41 PM
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Sometimes, when things donít make sense, the answer is simple. Are you wearing any rings on your fingers? Just throwing that out there.

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  #19  
Old 11-16-2018, 05:15 PM
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Had the same issue with my firs AT PRO With pin point issue also. I sent it in and they sent it back. Don't remember what it was they fixed but no truble with it now for the last 5-6 years.

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