Posted by Reg
on 5/12/2009, 6:11 pm, in reply to "Ordered a $61.45 Chinese detector"
67.172.155.233
Hi George,
Welcome to the world of detecting frustration zones where target ID's don't work well. In simple terms, blame the mineralization for the problem.
George Payne wrote an article on TID meters and how they work. Fortunately, JB posted on his site. Here is the link;
http://jb-ms.com/Baron/IDmeters.html
The bottom line is there is no simple way to overcome the problem caused by the ground signal. To make matters worse, I have seen areas where the target response goes up scale the deeper the target which would cause a dime to read like a dollar, and another place where the error was going down scale, meaning a dime might read as a nickel only a few inches down.
Just what happens has to do with the type of mineralization involved. Over the years, I have seen both types of problems and noticed that even moisture can have an impact on the depth of detection. That is why I don't relay much on TID's when looking for the older deeper coins. Like you, I have found them to be unreliable.
Since all TID circuits have to use similar techniques, there is no easy way to compensate for this condition of TID error that I know of.
Reg
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