Hello to everyone here on Tek forum. I have been learning from the post's here for about 3 years. Sorry for not introducing myself sooner, but being a newbie I don't have nothing to contribute compared to most of you guys. This site has helped me very much, I have a Delta, been using and learning it for a little over 2 yrs. Anytime I ran into a problem or just puzzled over a certain issue I could find help searching old posts. MAN I'M GLAD I RAN ACROSS THIS SITE!!! I just got a 11dd f5 coil. I have had a couple short hunts, I think it will be Sweet after I learn to pinpoint better with it.I was checking different coins for comparison to the 8" concentric. When I scan a silver dollar it freezes I can continue to scan the dollar again it remains frozen for upto 30 or 40 seconds. When it starts working if I try to scan it again its instantly frozen or seems to not detect the coin at all. It will scan a clad 1.00 [Eisenhower] just fine at99. I noticed in comparison to the 8'' coil, silver coins showed a slight increase in ID over clad which is great. The 8'' always showed the same id for both. I thought it may be like raparound , rusty iron hitting as hi coin.somehow in reverse where id trying to hit low iron number. So I disc. to 10 [lowest setting on Delta] no difference. In A1 scans silver 1.00 as 99. A2 instantly freezes just like in disc mode. I really like my Delta and the new coil seems really good upgrade.But I hope someday to get lucky enough to dig a silver dollar, now I could walk right over one and never know it. PLEASE if anyone with a delta and 11dd could scan a silver $1.00 and a clad $1.00 and let me know the results I would really appreciate it. Sensitivity and volume settings made no difference on my Delta.