brandon2014
Junior Member
- Joined
- Apr 9, 2014
- Messages
- 55
I have a Garrett at pro and my ground balance comes in at 88-90. Does this mean my soil is highly mineralization. And how will this affect my depth.
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It does mean highly mineralized. Mine typically reads 77-80 something here in Va. And have even had it reach 90.
I will usually auto GB it then back it down manually a notch or two.
Also various things like if it has rained seems to make a difference as well as making sure you ground balance in a spot without metallic objects present.
I still get very good depth however.
I have a Garrett at pro and my ground balance comes in at 88-90. Does this mean my soil is highly mineralization. And how will this affect my depth.
How are you determining you are ground balancing in an free of metal targets?
Attempting to ground balance over metal targets is not a good practice.
The AT Pro owners manual, page 32 reads,
"Typical Ground Balance Ranges: 80–99: Highly ferrous (magnetite, ferrous oxide minerals, black sands, hot rocks, terra cotta)"
The owners manual, page 31 reads, "Detector performance can be negatively affected by ground mineralization. The AT Pro can be ground balanced either automatically or manually to cancel unwanted ground signals and obtain maximum stability and target detection."
Ground minerals may be a combination of magnetic minerals (high VDI) and conductive minerals (low VDI). Your ground balance number may be a factor in determining dominant mineral CONTENT, but not the QUANTITY of minerals. DD coils help as they analyze less ground per sweep than the concentric coil. Signal strength is lost due to high quantity of mineralization. The AT Pro does not have the ability to determine signal loss. Manually adjusting ground balance on the negative side (under-tune/negative bias) can help sensitize the machine to higher conductive metals under certain conditions, but makes the machine less sensitive to lower conductive metals. Manually adding to ground balance numbers (over-tune/positive bias) will help sensitize machine to lower conductive metals and less sensitive to high conductive metals in certain conditions. Hot rocks, cold rocks, charcoal turned into coke from old buried fire pits along with iron are potential issues for any detectorist. Ground conditions are the determining factor at the area of the site you hunt along with the metal you are seeking.
This would be an important concern for relic hunters and deep silver hunters, not a concern for general park, school or fresh water hunting.
I just got an at pro today and was wondering if you have to constantly gb.
Anybody else have a opinion on my high gb
Yes. Your number is high as others have stated, because you have soil with a higher ferrous content.. ie iron.
You have no choice. It is what it is unless you detect somewhere else. Take your detector with you next time you go out of town and I think you'll find different numbers unless you happen to have similar soil conditions at your destination.
Now go out and ENJOY that new machine!
Papa