Hello I'm new hear, (First post) I use a DFX . My question is this, Iwent to an elementary until 1969 I also had five siblings go to the same school before me. I have been hunting this school now on three different occasions. So far I have found one 1945 war nickel, about five 1960s nickles but dimes and quarters are all 1973 and newer. I have also found two cheep rings,cheep earrings,pieces of copper,cheep pennants,pull tabs,chunks of aluminum cans etc. This school has been there for many decades but no Wheaties or silver dimes or quarters? It is a noisy area (high voltage lines and airport traffic). I have been using coin/jewelery program keeping the AC sensitivity at 68 and Preamp Gain at 3. Is there anything else I can do to pull some of the older coins out? Thanks for your help PS I have only been metal detecting for three weeks. firedup