jtalley007 said:
BBS and FBS must behave differently than traditional single frequency machines?
I've always had a theory that Minelabs favor the lower frequencies since they don't respond at all or well to small gold.
If the upper frequencies were coming into play they would be killers on gold?
JMHO
Jerry
Jerry is FBS multi-frequencies about target conductivity or soil mineralization? Are the higher frequencies in FBS used for small gold? Sort of, I mean FBS will hit on tiny high conductors like 1/8 inch bits of fishing tackle, small silver chain lobster claw clasps, even the tiny silver butterfly wing earring backs much of which ID's between foil and nickel. But gold that small total silence so at the higher frequencies in FBS there are limits. This hints that FBS higher frequencies may be 2nd, 3rd, 4th order harmonic frequencies that are much weaker, vs a single frequency machine that's transmitting a fundamental high frequency at full strength. Facts are facts, FBS won't hit on small gold that my 56 kHz machine will smack HARD.
The spooky stuff Minelab won't talk about...how FBS rejects soil mineralization the secret to improved target ID at depth and maybe multi-frequency is part of that secret sauce. Silver quarter at 12 inches in moderate mineralization, FBS screams out silver, Whites DFX ID on that target iron, the 12 inches of soil mineralization so swamped the silver quarter signal the DFX could tell something was there, but it couldn't accurately ID it. Same day different target, large cent, same result FBS ID textbook large cent, no question, Whites DFX ID iron.
But targets even deeper FBS begin having the same issue as single frequency machines, the target portion of the signal begins to be overwhelmed with the soil mineralization, at the same time distance from the target to the coil means fewer coil magnetic field lines striking the target so while soil mineralization is increasing, the target portion of the signal is growing weaker. So on FBS target ID begins jumping around, you hear a mix of mineralization/coin tones. Deeper still and poof the target is gone, swamped by the soil mineralization.
So when Minelab says the Equinox has improved target ID at depth vs FBS that may result in more achieved depth depending on your local soil. It may pull jumping around iffy targets up into solid ID and targets you never heard up into the iffy jumping around zone. There's more to a depth comparison FBS vs Equinox than a simple air test.