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Jumping VDI
Posted by: Rob (IL)
Date: May 07, 2010 10:24PM
We've had some posts complaining about jumping VDI. The V3 is a sensitive detector and so is the D2. The detector is just not seeing what is under the coil. It's also picking up edge and fringe targets that are close to the coil. The effect increases as the gain and sensitivity is increased. When you get jumping good numbers use your pinpoint mode. Pinpoint the target, then take another pass in the search mode. Now that the target is centered under the coil the VDI ready firm up. You also get the most accurate reading..........Rob



"Everyone has an opinion, but mine is free":devil:
"You might very well think that; I couldn't possibly comment..."


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Re: Jumping VDI
Posted by: Larry (IL)
Date: May 07, 2010 10:45PM
Deeper targets will often not stabilize at all, in those cases you have to make a mental average of the VDI's if you want to try to make a guess at what the target might be. Even then, I dig all targets that are 5 inches deep or more and the VDI's are in the + numbers. I have made some of my best finds digging the "maybes". One example is today I got a very jumpy VDI display, 50 to 70's and pinpoint showed a depth of 5 inches. I dug a hinged plug and three wheaties were in the plug and three more were in the bottom of the hole.



Bells and whistles are nice, but nothing will substitute for the basic understanding of the hobby.

:minelab: CTX 3030

Re: Jumping VDI
Posted by: The Beep Goes On
Date: May 07, 2010 10:48PM
Which coil today Larry? Sorry for all the questions! :smoke:

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Re: Jumping VDI
Posted by: Rob (IL)
Date: May 07, 2010 10:53PM
...............Rob



"Everyone has an opinion, but mine is free":devil:
"You might very well think that; I couldn't possibly comment..."


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Re: Jumping VDI
Posted by: Larry (IL)
Date: May 07, 2010 10:56PM
I still use the 10X12 SEF, just haven't bothered to put the D2 on yet. Early testing showed about the same depth on both, ground noise a little better on the SEF and a little better coverage too. I wouldn't go out and buy a 10X12 to replace the D2 though, I had the SEF left over from my DFX days and that is what I was used to using.



Bells and whistles are nice, but nothing will substitute for the basic understanding of the hobby.

:minelab: CTX 3030

I have a minnie at about 8" in the yard...
Posted by: jbow
Date: May 09, 2010 04:43PM
It consistantly reads with a VDI in the 90s except at one direction I can get it to go down into the 60s. The proper VDI is 51 however... even though I get a wrong VDI the multigraph is bunched up on the right end of the scale and looks really good. Also in pinpoint the 7.5 frequency hits a good bit stronger than 2.5 and 22.5 as it should on lead. I went back and checked Jeff Foster's book, "Digging Deeper with the DFX" and Jeff writes that the spectragraph always trumps the VDI number or the Icons. Now, I realize that the V3 isn't a DFX but this translates over to the V3, especially when you look at the depth guage and see that the target is 5" or more, according to the ground.

I spent several hours yesterday afternoon in the backyard with some targets that are "iffy" at best and found that the multi-graph on these deeper targets was consistant and bunched into one part of the graph and usually read higher than it would on the target in an "air test". The 51 of the minnie was in the 90s, the 19 of a nickel was in the 30s and the multigraph read in the 90s for the minnie and the 30s for the nickel but was consistant over all three frequencies in both "best data" and "correlate" on both targets... also the correct frequency hit strongest, as it should, even if the VDI is way off, (high). It may be jumpy but is, so far as I can tell, jumpy in a higher range.

Trust the multigraph or spectragraph and expect it to be wrong to the high side with depth. Expect the proper frequency to still hit strongest.

The analize screen was rough on most of the targets. The humps were there with the proper frequency on top but the lines were ragged, especially on the minnie, the nickel, and on a dime at about 8".

Hope this helps.

Julien



Julien in Cartersville, Georgia...

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Tejon
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Hello Julien...You are making me nervous by......
Posted by: Clyde(La.)
Date: May 09, 2010 08:12PM
What you are saying. I have a nickel buried deep in my test garden at my house. I get higher than normal readings on it with V3. I have a silver dime at about 9" to 9 1/2". It sometimes jumps into the 90's also. What I am nervous about, is you have me thinking that if I get in an area with really deep silver quarters or halves, then what will happen. I hope they do not read to much higher and wrap around in iron range. Is this possible or am I just too cautious.
Thanks, Clyde



My Detectors: XP Deus, E-Trac(3 coils), Sovereign GT(2 coils), F-75(2 coils), Spectra V3(4 coils), GTAX 1250(4 coils), Classic SL IDX, Minelab Sterling(4 coils), Troy X5, Golden UMax(5 coils), Minelab Advantage(4 coils),Sea Hunter Mark II, Detector Pro Wader, Minelab Musketeer X and Garrett AT Pro

Re: Hello Julien...You are making me nervous by......
Posted by: jbow
Date: May 09, 2010 09:51PM
Well, that is what correlate is for. It may be the setting to use for deepies or in iron..??

J



Julien in Cartersville, Georgia...

SovereignGT
Tejon
T2
E-Trac
V-3
F75 LTD
Omega-8000
Compadre

I have CDO. It is like OCD but the letters are in order like they should be...

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Don't let nervous and scared enter a fun pastime!
Posted by: nw1886
Date: May 09, 2010 11:20PM
The whole thing with those kinds of VDI reads is.....they show up with the lions share being good numbers and have a high spike or two.
Your deep coins (of that size) will not do the wrap thing. Low conductors can. Exceptions to this is a contaminated signal from adjacent targets. You will learn to see this when it happens as your good portion of the signal will read true-ish from all/most angles

That has been true with every detector I have ever owned and the V3 is no different. You can cruise any information source, concerning any detector, and this holds true clear across the board. You just have to dig a lot of signals and not be uptight about this natural leaning process. (That is what teaches you and not all the "spoon feeding" of info.)

Larry was talking about the three Wheaties coming out of one hole reading "different". Add to that find an adjacent piece of foil and a nickel, dime and still....a small chunk of iron. Even then, enough good info would be left intact to cause you to dig.



Personal Experiences:

Deep signal comes in at a run of numbers starting out in low 40's (with spikes into low 60's). You then find center and you begin to see 62,68,82, -25, 92, 64, 15, 92. Depth reading tells you 8.5......start digging. (For me it has been a deep Wheat or Indian.)

Shallow signal comes in at 62,83,49,68, 91, 60,62. I've dug heavily oxidized Standing Liberty Quarters with this type of signal. (It was outside of an old dry cleaners and I'm guessing the chemicals aggravated the oxidation.)

Sweeping your coil across an old yard. Solid hit at 91,88,90,87,87,88,85. Depth check reads 11 inches! Barber Half!! Go figure...read exactly as you would hope!!! This happens too! (Happened to me and it was because of clean, loamy ground with absolutely no mineralization and no signal contamination from adjacent targets.)

Huge amount of signals coming in at 15, 17,15,2,16,15. There were so many that I had to dig. (Just to see what the heck they were!)
They all turned out to be shallow Wheats... all dated no later than 1922! (Cause of such weird VDI's was all these signals were at the base of a row of very old Mountain Ash trees. Ground had absolutely no "build", very active root system sucking huge amounts of water over and through the original/highly acidic matrix, causing the pennies to not have an original surface content and elongated/diluted halo.) All the pennies were blood red in color.

Ask "Why?". More often than not you'll figure out why....and carry that knowledge forward to every hunt you do! It's a fun process!!! HH

Re: Don't
Posted by: Tjcooksey80@gmail.com
Date: June 19, 2018 05:59AM
Cool!

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