Originally Posted by calabash digger
I get what your saying about the iron dust, like when you dig it out and its started decaying ,I got what your saying now.
Yep, and an ultra small piece of nonferrous like foil,,,could mask a deeper coin,,,pulse machine COULD have better chance to sneak through.
As finds get deeper,,,the receive window gets mighty small compared to shallow,,,one of the reasons why deeper finds coil position gets more critical.
And mineral,,,will cause this window of detection to start shrinking too.
Coil hot spot so to speak gets smaller and smaller.
Folks here need to understand,,,take the Deus or any other Vlf detector,,,we'll use Deus,,full tones 0 disc,,,,just because NO tone is provided doesn't mean necessary there isn't some either ferrous or nonferrous material under the coil,,,there in fact could be,,,,but small enough not to set the detector off tonally,,,yet a lurking deeper nonferrous,,or even ferrous could lie beneath.
This smaller nonferrous or ferrous (blocker) could be destroying the signal on the actual normally depth detectable ferrous or nonferrous find that lies beneath.
We CAN'T see or don't know what is going on internally ( with detector circuitry) all the time when the coil is passing over the ground.
Also very possible using a Vlf detector to hunt a site,,,one of these super small ferrous blockers keeps a person from finding a good find,,,,and 10 years later,,this ferrous blocker deteoriates so much,,,the same detector and coil can then detect the good find.
This indeed could be why some sites(old) keep giving up some finds over the passing years--- and maybe not be tied to " supposedly" better detector performance as some might think.
This is slicing hairs,,,but I think it is true.
Calabash,,,keep the vids a coming,,I like them and appreciate.
Also some #9 birdshot could be used and just maybe duplicate some of what had been said.