AT Pro VDI

Starting a thread to purposely bash a product and get everyone in a uproar. Not my intention here at all.
 

There may have been trash under it - I've never had that problem, actually just dug a silver quarter at 10", no number on the vdi but a whispered a high tone.
 

My take on this is when I get wrong ID numbers it's because it needs ground balancing. I know people must be tired of hearing it, but you cannot assume you are on clean ground if you have any iron discrimination on. You will think you are on clean ground because you can't hear it but the iron is being discriminated and you end up with the wrong ground balance. And there are times on damp sand the auto balance just doesn't work right. In this case use manual and only lift the coil an inch or two when pumping. Sometimes even less. Another option in the difficult conditions is to bury a target and manually ground balance to the best response. When the gb is wrong, you will not get the best depth or accurate ID numbers and even interference will be worse. BTW, a clad quarter should be about 87 or 88 so that tells me your balance is wrong.
 

Excellent theory and well put explanation! Gonna spend tomorrow messing around with balancing!
I am so guilty of "balancing " as you said with some iron discrimination already there lol! Thanks for that lil tidbit!
 

signal_line said:
My take on this is when I get wrong ID numbers it's because it needs ground balancing. I know people must be tired of hearing it, but you cannot assume you are on clean ground if you have any iron discrimination on. You will think you are on clean ground because you can't hear it but the iron is being discriminated and you end up with the wrong ground balance. And there are times on damp sand the auto balance just doesn't work right. In this case use manual and only lift the coil an inch or two when pumping. Sometimes even less. Another option in the difficult conditions is to bury a target and manually ground balance to the best response. When the gb is wrong, you will not get the best depth or accurate ID numbers and even interference will be worse. BTW, a clad quarter should be about 87 or 88 so that tells me your balance is wrong.
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Thanks for the reply. This makes alot of sense. Not used to having to deal with this on the Etrac. I really like the way the AT Pro operates. I just have to learn its nuisances.
 

I tell u what, I see so many theories on how to get this signal or how to balance that..if you guys want the official site to where people post their numbers from targets/finds and get a true number sheet to go by from hundreds of people posting PM me and I'll give u the link. I can't post it here since it breaks forum rules to post from another site. I swear some of the advice ppl give I think they're either suffering from fever or overmedicated

Sent from my RM-820_nam_att_100 using Tapatalk
 

Its because its Metal Detecting....Soils are different...coils are different...People are different..Signals can be different

I hunt with a guy that runs an Etrac, and he gets a constant sweet Quarter signal 10" deep, and it turns out to be rusty bolt...it happens
 

Ok Folks, Here we go. Took the AT Pro out this morning and went to an area where I know the ground is real clean. No junk and no mineralization. Ground balanced very carefully and then buried a clad dime at 7 inches. Here's what I got. In pro zero at full sensitivity with iron audio off I got a faint low iron grunt. Turning iron audio on I would get a constant deep sounding mid tone with vdi numbers jumping all over. I would occasionally see it jump into the mid 70's but still a mid tone. I then switched over to standard coin mode hand it would occasionally hit loud and high tone as long as the coil was scrubbing the ground. I am very confused here. I have read all over the net that the way to hunt is in pro zero mode with iron audio off. I am afraid that if I hunt this way I will miss deep coins. I am a very experienced hunter. Been doing this since 1978. New to this machine though. Please help. And no, this is not a bait.
 

Interesting! I was out this morning and dug up a nice merc at 8 inches and it sounded off with a beautiful high tone. Ground balance was 82 and I backed it down to 75, running in pro zero with sensitivity maxed and disc at 32. This is also with the stock coil. I hit a Rosie the other day at 10 inches and all I got was a high tone from one direction. Could your coil be bad?
 

Thanks. What is the purpose of backing down the gb. I have read other post where people are saying that you must be properly ground balanced to get correct vdi numbers.
 

Sheppie22 said:
Ok Folks, Here we go. Took the AT Pro out this morning and went to an area where I know the ground is real clean. No junk and no mineralization. Ground balanced very carefully and then buried a clad dime at 7 inches. Here's what I got. In pro zero at full sensitivity with iron audio off I got a faint low iron grunt. Turning iron audio on I would get a constant deep sounding mid tone with vdi numbers jumping all over. I would occasionally see it jump into the mid 70's but still a mid tone. I then switched over to standard coin mode hand it would occasionally hit loud and high tone as long as the coil was scrubbing the ground. I am very confused here. I have read all over the net that the way to hunt is in pro zero mode with iron audio off. I am afraid that if I hunt this way I will miss deep coins. I am a very experienced hunter. Been doing this since 1978. New to this machine though. Please help. And no, this is not a bait.
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A coin freshly buried deep in soil is nothing the same as one that took 20 years to get that deep.
You cannot rate depth or VDI readings by trying this experiment. Way too many factors involved to try figure it out.
 

I have also experienced this, just happened to me tonight, I have found that it helps to do a small 4 inch sweep over your beep then usually the low fart tones go away, either way I guess I am digging a target in the 80's. I could be wrong but I also think part of it has to do with the quarters orientation to your coil, one of the trickiest signals I have ever had was a quarter that was on end.
 

My problem is that even though this is a freshly buried coin since I only received a low iron grunt in pro zero I would have passed right over this coin thinking that it was iron. Freshly buried or not it just seems strange to me that I would receive a iron grunt on a 7 inch dime in pro zero mode with iron audio off. Maybe I'm wrong. Educate me.
 

I would say the grunt your hearing is from a small piece of iron or trash in the ground and it's not seeing the freshly buried dime at 7" at all.
 

Checked the ground before I buried it and totally clean. Iron grunt pinpointed directly in the center of the plug. Like I said earlier when I switched iron audio on I would get a mid tone with vdi jumping around and occasionally hitting 75. In standard coin mode I would get a high tone if I scrubbed the coil right over the ground.
 

Stop worrying about what fresh buried coins do or don't do. Or how they bloody air test or what ever other arbitrary test you want to throw at it. Get out and dig some real targets and learn the thing if you're really interested.

Still smells like bait to me!
 

fella said:
Stop worrying about what fresh buried coins do or don't do. Or how they bloody air test or what ever other arbitrary test you want to throw at it. Get out and dig some real targets and learn the thing if you're really interested.

Still smells like bait to me!
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l think I will do just that. Sorry to bother you.
 

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