Discrimination and large targets

[mwaynebennett]

Well, I just learned that the discrimination only works on small targets. I was at an old town site that is now overgrown with trees and brush and had my discrimination set to exclude iron. I kept getting a signal saying $0.25 and when I dug it,it was a part of a cast iron stove about 4" x 5" x 3/16". I set the scrap on the ground and turned up the discrimination all the way, and I still got the $0.25 coin indication. It sure sounded like a quarter, but was only rusted iron. I did find a chunk of lead and an old cartridge case however. No Mason jars fill with $5 gold coins.

 

[wasp]

I think that most detectors are "tuned" to identify US coins, gold, and silver. Other items will cause the detector to make a "best guess" based on the electrical conductivity of the item. After a lot of experience digging those signals and noting the detector reading you will get a feel for what is down there based on the type and size/intensity of signal. Keep at it and keep digging!

 

[GoGoGopher]

In a all-metals or pin-point mode, large targets will give off a long loud signal. Coins will give a short crisp, signal...Some detectors vary the loudness of the signal with the depth and size of a target. On my White's, a deep large target will give a sort of long, broken, but still fairly loud signal. A shallow large target will almost blast my ears off with a long loud tone. deep coins give those almost whisper signals (consistent, but soft). Shallow coins give a short loud stacato note...pull tabs and junk give a varried broken signal, that changes with the angle I sweep the target from.

HH,