Beaches are typically low in magnetic mineralization. The Separation mode designed for both low mineralization and sorting out coins from iron would be the FE/Coin mode. FE/Coin uses advanced signal processing that minimizes the blending of ferrous and conductive targets, allowing for better TID on both targets by displaying both cursers on the screen. Target Trace will also help sort out the targets by allowing the image of each to remain on the screen for a longer period of time. When the cursers of a coin and one of those pieces of iron are both displayed on the screen, you should see both targets, but the TID will typically be for the coin. If you implement FAST ON, your CTX will react more quickly to individual targets. However, FAST ON can also cause the TID of multiple targets to be blended together, giving you a TID that would not be necessarily associated to either target, if they were detected separately. If the iron is so close together that you need to implement Fast ON to separate targets, then by all means use it. However, if you can operate effectively with FAST OFF, you will get a more accurate TID on the coins. Use minimal discrimination and sweep slow.
After hunting a specific area with the above settings, I'd switch over to High Trash separation and set up your discrimination Pattern to reject the iron. Signal processing in High Trash Separation will allow you to identify weak accepted target signals amongst rejected targets, even when the rejected targets are larger and produce a stronger signal. Note that your TID on accepted targets will be less stable when using High Trash, compared to low trash or FE/Coin. But you can get by with a faster sweep speed using High Trash. JMHO HH Randy
