Im just wondering if anyone has done any single frequency VDI testing on the NOX and what were your results? I know in multi frequency pull tabs come up as 14ish roughly and thats in the gold range. What about in each single frequency? Would you have a better chance at distinguishing gold from pull tabs in single frequency? Also a lot of small silver jewelry falls into the low to mid 20's in multi. Would it be easier to distinguish a copper penny from a small silver ring or earring in single frequency? Any thoughts?
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Single frequency VDI numbers
- Thread starter cashmole
- Start date
cashmole,
You may be assuming that the VDI for a pull tab is reserved specifically for pull tabs...and no other metals can use it...kind of like a phone number.
(And that gold also has it's own reserved VDI numbers.)
That would be in error.
Many metal combinations can ID exactly the same as a pull tab...including nice gold rings...REGARDLESS OF THE SCALE USED.
(And there are many different ID numbers for pull tabs...they're not all the same.)
And since gold can be found from one end of the VDI spectrum to the other, it is always painful when the aspiring detectorist realizes that low conductor junk metals like foil and aluminum can also be found WITH EXACTLY THE SAME ids as gold or even silver.
Some practiced individuals can indeed hear the scratchy/uneven sound of mangled junk, or even a complete pull tab.
That's because they present multiple edges/facets/angles to make the ID numbers jumpy/uneven during the coil sweep, and thus just don't sound 'clean', not because of any ID difference.
But pull the tab off a ring pull, and now you've got a nice clean ring...made of junk metal...and it will sound just as clean and pretty as a gold one.
(Same with aluminum washers, and other such junk)
In short, people have been trying to do this since the invention of the metal detector...with very little success.
Currently, the best you can do is play the odds:
1. Go to a place that should have more gold and less junk.
2. Dig the cleaner, more repeatable low conductor signals.
3. Accept the fact that your junk pouch will always be much fuller than your gold pouch.
Good luck, and HH
mike
EDIT - Even more true with copper and silver.
You may be assuming that the VDI for a pull tab is reserved specifically for pull tabs...and no other metals can use it...kind of like a phone number.
(And that gold also has it's own reserved VDI numbers.)
That would be in error.
Many metal combinations can ID exactly the same as a pull tab...including nice gold rings...REGARDLESS OF THE SCALE USED.
(And there are many different ID numbers for pull tabs...they're not all the same.)
And since gold can be found from one end of the VDI spectrum to the other, it is always painful when the aspiring detectorist realizes that low conductor junk metals like foil and aluminum can also be found WITH EXACTLY THE SAME ids as gold or even silver.
Some practiced individuals can indeed hear the scratchy/uneven sound of mangled junk, or even a complete pull tab.
That's because they present multiple edges/facets/angles to make the ID numbers jumpy/uneven during the coil sweep, and thus just don't sound 'clean', not because of any ID difference.
But pull the tab off a ring pull, and now you've got a nice clean ring...made of junk metal...and it will sound just as clean and pretty as a gold one.
(Same with aluminum washers, and other such junk)
In short, people have been trying to do this since the invention of the metal detector...with very little success.
Currently, the best you can do is play the odds:
1. Go to a place that should have more gold and less junk.
2. Dig the cleaner, more repeatable low conductor signals.
3. Accept the fact that your junk pouch will always be much fuller than your gold pouch.
Good luck, and HH
mike
EDIT - Even more true with copper and silver.
Thanks for the reply. No im mot assuming pull tabs have their own unique VDI number but Im wondering if the numbers in single frequency will be different than in multi or fall lower or higher on the scale. For example on the NOX a smaller silver piece of jewelry could be 20-27 This is same as a copper penny. So Im wondering if silver would register slightly higher in single frequency for example. On my old AT pro even small silver rings usually rang in higher than a copper penny.
Jason in Enid
Active member
No, they are the same.
I did a little testing with some Canadian clad coins. More specifically we have dollar coins that started in 1987 that we call the "loonie" after the Loon bird on the front. The loon is found on many northern lakes and makes a very nice sound early in the morning.
Anyways....on Multi frequency the dollar coin (made of 91.5% nickel with a bronze plating) come is roughly at a 12 bouncing a little. On 15Khz single frequency it comes in at 29-30 with a higher tone. So changing from multi to single frequency did in fact change the numbers. This is why I was asking if it also changed pull tab, gold, and silver numbers. But the numbers did in fact change on this Nickel and brass Loonie Canadian dollar.
And the link to my testing video is here: https://youtu.be/bnNqBvD_bmQ
The part where I try the Dollar coin in multi and single frequency is at @17:35
It shows plain as day that the numbers do change on multi to single frequency.
Anyways....on Multi frequency the dollar coin (made of 91.5% nickel with a bronze plating) come is roughly at a 12 bouncing a little. On 15Khz single frequency it comes in at 29-30 with a higher tone. So changing from multi to single frequency did in fact change the numbers. This is why I was asking if it also changed pull tab, gold, and silver numbers. But the numbers did in fact change on this Nickel and brass Loonie Canadian dollar.
And the link to my testing video is here: https://youtu.be/bnNqBvD_bmQ
The part where I try the Dollar coin in multi and single frequency is at @17:35
It shows plain as day that the numbers do change on multi to single frequency.
The VDI on Equinox is "normalized" thru all modes, meaning they response will be the same for a given target. What I think you are seeing is a response change in single frequency due to the Ferrous content. Gordon Heritage {IronheartedGog} detailed this quite well in a video about a year ago called false and faint signals. Keep experimenting with ideas as this is how we come up with some interesting discoveries.
Jeff
Jeff