I recently purchased the 9" 3KHz Concentric coil. I then read everything Digger (Randy) posted about this coil. I then took it to the field and was determined to use it in Multiple Target Tones and in all medal as Digger suggested. Perhaps I'm a slow learner but to say I had one heck of a time adjusting to the Multiple Tones is a understatement. I was getting all these tones and was having a hard time telling the difference from a zinc penny to a quarter. In fact I dug several coins that I though were dimes which turned out to be penny's. I then went back to 2 tones and set my X-70 to the coin mode. I hit a solid 36 at 4 inches. I knew this was a dime. I reset my X-70 back to Multiple Tones and all metal. The tone was in the high range and 3 to 4" and 36 was displayed. I dug and recovered a dime. I then returned my X-70 back to 2 tones and coin mode and continued to hunt. My next td was a solid 42 at 6". This would indicate a quarter or larger coin. I again changed to multiple tones and all medal. Sure enough I received a high tone and a 44. I dug and recovered a quarter. The point I'm trying to make is if you are having problems using multiple tones the above approach sure is helping me adapt.
TomB
If he could pass for my twin
I fished for two years on the BASS Pro Trail back in the early 70's when pro bass fishing first got started. In fact I'm the guy who invented the "swimming worm". Last name is Bentley TomB