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Why Single Frequency? & Why Accept Negative Numbers?

N

Neil in West Jersey

New member
I got out for a quick hunt for an hour after work and returned to my favorite site...the finds are becoming sparse (but my buddy pulled a KGII from about 8 inches).

I decided to focus all of the V3i's energy into one channel to try to squeak out some extra depth. With a few easy clicks on the menu I was in 7.5Khz, which is the best for all-around detecting. I was working very slowly, digging all deep signals and all questionable targets. I tried the area where the Flowing Hair Half Dime was dug back last month, and I got a deep chirp with a VDI in the 90's and the depth jumping from 10 to 11 inches. After digging a large, deep plug the chirp was still there. I stuck in my whole pinpointer in the hole and found the deepest penny I ever found, at 12 inches! Certainly not one of my best finds, but probably my deepest with the V3i. Ironically, the 1944 cent was much deeper than the Half Dime! Single frequency definitely made a difference.

A few minutes later I got a consistent -17 (that is a negative 17) VDI reading at around 7 inches and dug the tombac button, and then the tiny collar button which was also in the negative numbers. The tombac read around 15 VDI once it was on the surface.

If you are rejecting negative numbers you may be rejecting good targets! I accept from -40 to +94.

This is not meant to be a "today's find" post. It is meant to illustrate how Vision, V3 & V3i users can set up their units to improve its performance a bit.
 
I totally agree Neil. My custom relic hunting program is set for single freq. 7.5 and negative 30. I also turn on the All Metal in Search Audio for a little added depth. On the DFX/XLT it was Audio ID and it made a big difference in depth. Got that tip personally from Jimmy Sierra.
 
MSG Hoff said:
I totally agree Neil. My custom relic hunting program is set for single freq. 7.5 and negative 30. I also turn on the All Metal in Search Audio for a little added depth. On the DFX/XLT it was Audio ID and it made a big difference in depth. Got that tip personally from Jimmy Sierra.
Click to expand...

By ALL Metal ON, I assume you mean Mixed Mode? It is always on. In fact, at first the only thing I heard on this deep penny was a slight change in the threshold from the all metal channel at first.

I am not sure what you mean by Audio ID on the DFX?
 
No, not mixed mode. I do not use it for relic hunting. In the Expert menu under Search Audio is a setting for All Metal that responds to all metal types. I believe this is similiar to the DFX/XLT AUDIO DISC (which I should have stated earlier). It allows you to hear all targets without discrimination.

Jimmy Sierra stated to turn off AUDIO DISC to be in all metal on any program. We were discussing deep targets and with the AUDIO DISC on it would not verify the target as good (could not hear it) but you could hear it with AUDIO DISC off. It was a civil war bullet at 14". JR
 
If I'm thinking right, audio discrimination off is the same as accepting all VDI numbers, you'll get a beep for everything. Mixed mode or all metal gives you something similiar to the pinpoint audio for non accepted numbers and a beep for accepted numbers.
 
That is correct. All metal targets beep. If all metal is off you could run the risk of not hearing a really deep target.
 
When at the hunt last week I had accepted down to -30 using mixed mode. Interestingly, I either got positive numbers from about +10 up (very few) or just an all metal signal. Nothing came in between -30 to +10. Though I realize the ground was bad, I would have figured that the non ferrous targets might have come in a bit higher than the nails.
 
I did very well down there two weeks ago relic hunting. I cannot tell the difference between a bullet and a nail when they are deep. Close nails and junk will give the double beep and these I did not dig. The VDI is nice, but the detector will lie to you in hot ground. A few years ago hunting with the DFX300 in Virginia I dug bullets that would VDI at -30. That Virginia ground is really something.
 
It is, I did pick up quickly on the double beep and a few other strange sounds. Wish I could have hunted the 3rd day, I was getting used to it but the snowstorm got the better of me! lol
 
If White's could come up with with a ground balance that works in Virginia soil on a VLF............... that would be sweet.
 
Indeed! The guys that did the best down there had high end pulse inductions machines. I won't be using one as my wife says I cannot spend 5 grand on a detector. Spoil sport!
 
You can pick up the TDI for $1500 or less......... a belt plate or two would pay for that.........:devil:
 
MSG Hoff said:
No, not mixed mode. I do not use it for relic hunting. In the Expert menu under Search Audio is a setting for All Metal that responds to all metal types. I believe this is similiar to the DFX/XLT AUDIO DISC (which I should have stated earlier). It allows you to hear all targets without discrimination.

Jimmy Sierra stated to turn off AUDIO DISC to be in all metal on any program. We were discussing deep targets and with the AUDIO DISC on it would not verify the target as good (could not hear it) but you could hear it with AUDIO DISC off. It was a civil war bullet at 14". JR
Click to expand...

Is there a difference on the All Metal channel of the v3i in Mixed Mode and ALL METAL, other than the fact that ALL METAL will beep while the all metal channel in mixed mode causes rises in pitch/volume in the threshold?

I doubt there is any depth advantage.
 
NO.

[attachment 193242 2011-04-02_225015.jpg]
 
In some of my air testing using all metal, mixed mode and discrimination settings, I have found that in MM I can get a viable vdi number an inch or so before the detector will give an audible discrimination beep. With this in mind, in theory, MM could potentially provide a good number slightly slightly deeper than merely discrim but you'd have to watch the screen. I theorize that Whites built in a "safe zone"
 
You lost me Rob, what question are you answering?
 
Is there a difference on the All Metal channel of the v3i in Mixed Mode and ALL METAL, other than the fact that ALL METAL will beep while the all metal channel in mixed mode causes rises in pitch/volume in the threshold?

No. You can see in the diagram the is just ONE all metal channel. Sorry Larry.
 
Rob, I have my forum setting on threaded as I always have and your posts are out of sequence always appearing under the first post in the thread. Are you trying something new?
 
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