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Notching and masked signals lowers VDI
- Thread starter Mark kus
- Start date
BigTony
Well-known member
Very interestI guess for sure.
Interesting, but as I think about it, logical. So if you have two overlapping frequency responses, and your machine wants to show you the highest amplitude response(theoretically the shallower or larger target) it will give you a response just above the notch. Don’t think of the say 70 vdi pull tab as a bar, but as a mountain where 70 is the peak. If we notch out to 71 but the the mountain is still higher than the coin mountain beside it, 72 will be the next logical vdi.
Mark kus
Well-known member
Yep it seems there are so many variables when detecting that's why I try to hunt all the time with no discrimination It lets me hear everything and in 5 tones or less
Mark
That’s what I do. Zero discrimination. 5 tones. This thread though has sure made me think about trying the notching described
BigTony
Well-known member
It is an interesting subject for sure. Sorry about the typo above, spell check knows best.
I have found coins in the same hole as trash. Sometimes multiple items of trash but never when they are touching coins or as close as you showed. So I feel it’s not an D2 issue as it is a general detector issue.
Picketwire
Well-known member
If you use the threshold in discrimination, will it null over the notch or disc setting? If so, a signal VID a point or two over the notch after a null could possibly be a coin with much higher normal VID. I did notice the same thing as the video shows with my Impact and Deus. However, if you turn 90 degrees both ways, you will be able to tell there are two objects and probably get a more accurate reading on both.