Ok, so I air test coins to get a VDI number. Go to my test garden where I have known coins at known depth. VDI is jumpy and all over the place if coin isn't near surface and worse as depth increases. How do you determine what to dig. Do you just go by the tones and ignore VDI? Do you dig anything deep as long as it's a consistent tone? Seen a MXT user said his threshold gets louder on deep targets, don't notice that mine gets louder on the 705. Input please as far as when do you dig deeper targets?
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705 and VDI questions
- Thread starter gambler13
- Start date
The TID number is directly tied to the pitch of the tone. So other than the fact that the tones update more quickly, there shouldn't be much variance. And the Threshold is a different tone than any of the tones associated with TID tones. So, if you listen real closely, you'll hear the Threshold break off right before the target tone is produced. If the target is set to reject, the Threshold will be replaced by a "silent" audio. (nulling, blanking etc)
TID's can jump around due to an improper Noise Cancel channel, too high of Sensitivity, improper Ground Balance setting, too fast of sweep speed, adjacent targets, or the target is just plain too deep for the processor to get reliable information. Frankly, most VLF detectors can only ID a coin sized target to about 6 or 7 inches, with any degree of accuracy. Coins on edge or any of the other things I mentioned above, and all bets are off. If you are sure all your adjustments are correct, and the coins are within the 6-7 inch range, try using the Target ID Stability feature.
If I am hunting one of the old farm sites (my preferred spots), I like to run in multiple tone mode, with all the notches open except for -8 and +48. By rejecting these two notch segments, I can eliminate most of the "wrap around" sounds of deeply buried iron. Since I'd rather listen to all those tones opposed to the nulling produced by rejected targets, I've learned the tones well enough that I can tell which ones to ignore and which ones to investigate further. Not just the pitch of each notch tone, but the consistency of the tone, whether it "thumps" at the end or beginning of the tone, if it provides harmonic tones as I slowly wiggle the coil back and forth over the target. If I get a repeating tone that gives me a TID of 6, 10, 12, or 24-46, I'm digging it. From my experience at the places I hunt, the other numbers aren't going to be coins or jewerly. If I am in a public park environment, I'd probably opt for more discriminatoin to avoid much of the modern trash. JMHO HH Randy
TID's can jump around due to an improper Noise Cancel channel, too high of Sensitivity, improper Ground Balance setting, too fast of sweep speed, adjacent targets, or the target is just plain too deep for the processor to get reliable information. Frankly, most VLF detectors can only ID a coin sized target to about 6 or 7 inches, with any degree of accuracy. Coins on edge or any of the other things I mentioned above, and all bets are off. If you are sure all your adjustments are correct, and the coins are within the 6-7 inch range, try using the Target ID Stability feature.
If I am hunting one of the old farm sites (my preferred spots), I like to run in multiple tone mode, with all the notches open except for -8 and +48. By rejecting these two notch segments, I can eliminate most of the "wrap around" sounds of deeply buried iron. Since I'd rather listen to all those tones opposed to the nulling produced by rejected targets, I've learned the tones well enough that I can tell which ones to ignore and which ones to investigate further. Not just the pitch of each notch tone, but the consistency of the tone, whether it "thumps" at the end or beginning of the tone, if it provides harmonic tones as I slowly wiggle the coil back and forth over the target. If I get a repeating tone that gives me a TID of 6, 10, 12, or 24-46, I'm digging it. From my experience at the places I hunt, the other numbers aren't going to be coins or jewerly. If I am in a public park environment, I'd probably opt for more discriminatoin to avoid much of the modern trash. JMHO HH Randy
At a Siding
New member
Mr. Digger. I've had my 705 a couple months now, and have good results, but have never tried to dig anything with a VDI of 6, supposing it to be junk. Are you saying this is a possible jewelry target #?
Thanks...
Thanks...
I've dug several small gold rings that read a 6. I even dug a small child sized gold ring that read a 4. I also dug a US nickel 3-cent piece that read a solid 6. If you keep checking the Treasure Talk Forum on Minelab's website, they will soon be posting Part 2 of my series on Notch Discrimination on the X-TERRA - Ever wonder what you're missing? Part 2 will identify MANY targets that folks are passing by, simply by using too much discrimination.
http://www.minelab.com/usa/treasure-talk?postid=24625
HH Randy
http://www.minelab.com/usa/treasure-talk?postid=24625
HH Randy
Wow, I think I have probably passed up a few things. Don't remember getting a 6 very often but I believe it has happened before. I also like canceling out the -8 and the 48. I'll have to try this. I have the X 70 so i believe these are the same on the 70 and the 705. I learn something new here every time I start reading. Thanks Digger.
7centsworth
Well-known member
I air tested a 3 cent nickel and it read a solid 6.
Digger,
By setting up the 705 to only discriminate -8 and 48 to prevent wrap around as you prefer, what could I possibly miss by having the 48 setting discriminated out? What advantage is this to the all metal mode? Thanks. Your knowledge and info on this machine has really benefited many of us in this forum
By setting up the 705 to only discriminate -8 and 48 to prevent wrap around as you prefer, what could I possibly miss by having the 48 setting discriminated out? What advantage is this to the all metal mode? Thanks. Your knowledge and info on this machine has really benefited many of us in this forum
If you are running with a high level of Sensitivity, or a positive ground balance setting, you could miss a large chunk of silver by notching out the 48. But if you listen to the size of the "target blanking" over a rejected target, it can give you audio tips as to whether or not you want to scan it again in All Metal, Sizing Pinpoint or Prospecting Mode. As I've mentioned previously, deep iron will produce harmonic tones when using multiple tone mode, zero discrimination. A silver dollar, for example, will not produce the low harmonics. Just the high tones. Again, my settings are site dependent. And that is the beauty of the X-TERRA. You can "fine tune" it for just about any situation you can imagine. JMHO HH Randy