Correlate VDIs vs Best Data?

[5900_XL-1]

I only tried correlate a few times over time and I frankly gave up on that mode because all my VDI numbers seemed to shift away from the expected VDIs I am used to from best data. Was I imagining that? Like I said, it was a nusance to re-learn my VDIs so I quit correlate because of this alone. martin

 

[Rob (IL)]

They do differ a small amount. This is because you are getting information from two of the frequencies not just one.

The theory behind correlate is that iron will respond with different phase angles for the different frequencies whereas coins and such will give the correct response across the frequency ranges. So, it is one way to discriminate out iron. The drawback is that potentially you lose depth because the ground affects how the targets come in so they will appear to have the phase difference like iron might and get discriminated out. But, EMI noise would theoretically have an unpredictable response across the frequencies and might be one way to remove EMI too. So, for those that don't want to hunt the deep targets might get an advantage for skipping over the iron targets using correlate. But for those that want deeper, I don't think correlate would be as good an option.

 

[Elton]

At depth in junk areas it may never agree in correlate ...... so you may just get VDi's from the junk items..