Think about the field of a DD coil...in the illustrations, they depict it like a thin rectangle...In field, it actually has a little point right in the very dead center...so the crispest tone and highest signal strength is right there!
MP I've been testing the the concept of hopping to help me isolate good signals within a trashy beach environment and to get a third, z-axis confirmation on the initial tone.
Couple things have been coming up that I can't quite grasp and thought maybe you could clue me in.
I'm using an equinox 800 in Park2, 5 tones, 3 Iron Bias 7 recovery speed, 15-20 sensitivity, by the way.
When I get a good hit I do a side to side, rotate 90 degrees and side to side again and have what I consider a reliable tone. Lets say it's a 28-30 on the Nox suggesting a quarter down about 4-6 inches. I go to all metal and I still get the same reliable tone and depth indication. This tells me it's something I want to dig.
Then to double check and find exactly how deep it is I go to coil hopping and I may or may not get the same non-ferrous tone. If I do it looks like the target is indeed in the 4-6 inch depth range and I have it pinpointed quite well.
To further confirm its a good target I switch to all metal and hop again but this time I'm getting ferrous tones along with the the non-ferrous tone. Sometimes the non-ferrous tone is diminished suggesting that it may be a lesser target say a penny instead of a quarter.
The ferrous tone may show the same depth on the meter or it may show it slightly deeper but usually not more than about 4 inches deeper.
Given the 2-outta-three confirmation I dig the target and sure enough it is a coin, as often what the TID said coil hopping as it does on the side to side.
However I'm not finding any other ferrous metals in the hole. I double check the hole and the tailings with both with my carrot and my nox and get bupkis.
Any thoughts on this?
Why might I be getting a ferrous tone only when hopping?
Why might I get the ferrous tone and lose the non-ferrous tone while hopping?
I welcome your input