The whole "13 is a nickle thing" just doesn't stand up to real world detecting. People are digging nickels now because they didn't dig the numbers before with their FBS machine by being distracted by the off beat Fe numbers.
It is easier for me to recognize and dig nickels with the Equinox, than it is with the CTX. Similiarly, it was easier for me to dig nickels with the 11" Pro Coil on the Explorer, than with the 13" Ultimate coil. I switched from the Pro coil to the 13" Ultimate, as the 13" was definitely a deep silver killer, but I had to sacrifice my "nickel" skill. It is TERRIBLE with ID on really deep nickels, compared to the 11".
So, fast forward to today; after becoming used to how poor the 13" Ultimate was at identifying deep nickels, and now that I am 6 months into my switchover to the CTX, I will say that the CTX and 17" coil allows me better skill digging nickels than the Explorer and 13" Ultimate did. I have had "some" success with it -- but its IDs are still REALLY bouncy, for me, in my dirt, on a deeper nickel. I dug a deep (8") V nickel about two weeks ago with the CTX and 17", but I ONLY dug it because I was a very small spot that had a history of giving up deep coins -- so I was almost in a "dig it all" mode trying to eek out a couple more deep ones. But NO WAY, if I were cruising through a park hunting nickels, would I have dug that target, as the ID was all over the place, and averaging higher on the CO scale than a nickel should have been (it was averaging upper teens and low 20s on the CO numbers). It's the same way on a deep nickel in my test garden -- IDs extremely bouncy, but generally averaging SEVERAL notches higher on the CO number than the 12/13/14 you might expect for a shallower nickel.
The Explorer and 11" Pro coil was very good on deep nickels -- conductive numbers right around "05," but with FE numbers creeping up into the teens, on nickels over about 7". An 11/06 shallow nickel might average say 16/05 when deep -- but it was stable and you could depend on it. It was definitely better than the CTX IMO, with ID stability at depth, on nickels. Now, with the Equinox, I'm becoming able to skillfully dig nickels again -- again, due to its ID stability with depth on a nickel-type target.
Steve
Steve