No matter what you do you will get iron falsing, After a while you will get used to it and automatically tune most of it out. Problem is that deep coins and coins buried next to iron can sound very close to iron falsing and you will have to dig alot to tell the difference. Most places have been heavily hunted and only the very iffiest signals are left.
Couple of quick tips. I hunt smart screen(original XS) with everything open except the bottle caps in the lower right hand corner. If you don't use any discrimination on the left side of the screen you MUST use ferrous sounds, otherwise all the nail/screw/small iron hits at the upper left of the screen will sound just as good as silver hits at the upper right. Other wise if you use a little iron mask or discriminate out nails in smart screen you can stick with conductive sounds.
If you haven't already try laying a rusty nail on top of a coin. You will only get a hit from one narrow direction and 180 opposite. This demonstrates how important it is to hit a productive iron-laden site from many angles; and why we still find stuff in heavily worked sites.
I'm a died in the wool manual sensitivity guy. Seems the explorer community is about evenly split on this and we all find coins. Most prefer to run sens as high as is stable, but there are rare occasions where less is better.
Also would advise against using any patterns, especially tight learned-in ones. As you have probably seen by now that coins can hit in different places as you sweep over them. If you had that chunk of real estate disc'ed out you would have missed them. Much better to listen to all the sounds and learn what the machine is telling you.
Bottom line is that many of the sites we hunt are completely iron filled. Explorer is very good at sniffing stuff out in trash and that is why so many coins where found in hunted out areas when the first came out. This picture is from 2004; hit a very public park but most likely the first person to hit it with an explorer. Not a bad afternoon. Got dozens more pics like it and wish could find sites like this again.
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Changing coils/settings/techniques will bring up a few more coins each time but it is tricky and takes much patience and experience to weasel coins out of the trash.
Chris