VDI charts

[ohiodigger1950]

I'm close to choosing a new detector to get back into coin hunting after many years but have a question. I see "VDI" charts on different models and wondered if these were developed by actual coins found in the ground or if they can be determined from air tests or self-buried coins. I'm really excited about getting back into it and am antsy for something to do until the ground thaws here in Ohio. Thanks.

 

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[ohiodigger1950]

I just ordered an AT Pro.......should be here next Tuesday.

 

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[Frankn]

Metal detecting stuff, At what depth would those VDI numbers be valid? Frank

 

[Dwight S]

Metal detecting stuff, At what depth would those VDI numbers be valid? Frank

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Its an air test chart. Those numbers will be close down until its a weak signal which will vary, of course. I've dug 3-ringers at 9"+ that gave no vdi, only a faint tone with my AT Pro. I don't trust those charts. I dug a barber dime that rang 75 on mine. It was shallow and next to trash aluminum.

 

[Metal Detecting Stuff]

Frankn, it depends on the target and the soil. These were airtest numbers. I find the At Pro ID accurate to about 8-9 inches.

Wayne