Tony N (Michigan) said:
Won't increasing sensitivity also pick up the nails even more?
What would you lower the gain to?
Depends on your soil but a gain of 7 is a good target. Think of Gain and Sensitivity this way...Sensitivity turns your depth up and down, Gain turns your volume up and down. If you reduce your sensitivity it may eliminate a deep target BEFORE gain has a chance to do anything because the Explorer first applies your sensitivity setting to the signal. If you lower your sensitivity too far you can crank your gain to 10 to no avail because the deep target has already been eliminated by your lower sensitivity setting.
Also as a refresher, the Explorer transmits at max power no matter what your settings are. You can't for example dial back the transmit power by lowering your sensitivity it doesn't work that way. Since the Explorer transmits at max power always, regardless of settings, any signal received back from a target, mineralized soil, will be the best possible signal the machine and coil is capable of. Its fundamental to understand this so that you know what you are doing when you change various settings on your Explorer.
So the machine receives the 'whole' of the signal back from the target, now with your settings you will filter, slice, dice, and carve up that target signal. Reducing sensitivity begins chopping off the faintest, weakest part of the signals, deep faint targets may get sliced off if you lower it too far. You can practice this in the field on real targets in the ground. If you get a deeper target rather than rushing to dig it, take advantage of the learning opportunity. Begin lowering your sensitivity, at some point the target that may have been a solid hit will begin breaking up and eventually vanish altogether. Depending on the target and depth a target can vanish surprisingly quick. What may have been a solid hit with the sensitivity on 28 will begin breaking up at 25 and vanish at 24 or be so broken up it wouldn't have been something you would have noticed or dug. You can do similar field tests with Gain.