Iron can be detected outside the rim of the coil. How far depends on the size of the iron and how far it is from the coil. Aluminum and coins are pretty much up under the coil. We can use this to our advantage. In patterns it is the upper left FE coins area that cause the long nulls. Aluminum and metal rejected in that conductive and ferrous range have shorter nulls. The short nulls are not a problem to me. I attempt to shorten the long iron nulls which is why I am looking at the FE coins area. My current pattern has what looks like a narrow IM-15 then at the top a short black bar. I get a more narrow null on iron than if I have a wide IM-15 type open area that extends into what would be the IM-14, -13 area where we see Nails rejected if we select from the menu. I post this with the idea that I am doing a beta test of this so am not that sure what is going to happen but this lets you know what is going on in that area. I am trying to find a combination pattern for heavy iron so I can hear some iron but make if more users friendly. Although not shown in the illusration I have a medium rejection area for tabs and tails with the lower right area where screwcaps fall rejected. I have a narrow slot down at about 0 to -6 IM or 16 to 22 for ferrous readings to catch some of the gold jewelry that hits in that area. The bottom line is if I need to close up hearing all iron then want to close it down in part and hear short nulls on the iron.
By the way we can grind up a #16 nail to get the effects of ferrites. Grind up a buch and use the grinding to simulate ferrites for testing.
OK, I am really out for a hunt so catch you later. Hesitated longer than I should as I just got nailed again to help in the flower beds.
HH, Cody
