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VX3 & Small Silver Coins.

C

Count Pierre

Member
Simply, It won't pick them up at 4".

Over here in OZ we have 2 small pre-decimal coins..threepence & sixpence.Early ones were 92% silver, & later ones 50%.

The VX3 picks up all quite readily when the coins are on the surface.

Bury the coins at 4"....NADA....will not pick them up at all.

This is using both the 950 concentric coil & the 6 x 10 DD.

My DFX will JUST pick them up, very erratically, & there is no way anyone would dig them.

My mate's MXT PRO will also NOT pick them up.

Guess which detector picks them up clearly...................My FISHER F2., which even has a fixed ground balance!

What does that tell you?

NOT A HAPPY WHITES MAN AT PRESENT! :rant:
 
Most of us old timers already know that not all detectors work the same everywhere plus we have no idea how you have the V set up for your conditions and even if we did, most of us don't know your ground and what is a good set-up and what is not in OZ.

Use what works for you and good luck with the F2 :thumbup:
 
You definitely are talking to the wrong person about Australia. If you follow my posts you know I always say,"Use what works for you".

The only difference between the air test depth and the ground depth is the mineralization. So maybe you need a beter ground balance. You might be better off running the 2.5Khz single freq as it punches thru mineralization better.

[attachment 266431 usa.jpg]
 
Maybe it could be the coil choice?

I found one at 5 1/2" in a trash filled area with high EMI. Here is the link to the thread. I was using the d2 at the time. It sure is a cute coin, a little smaller than a dime. I remember the signal and digging it, it was one of my first detected silver coins....:biggrin:

http://www.findmall.com/read.php?66,1276598
 
QUote: Guess which detector picks them up clearly...................My FISHER F2., which even has a fixed ground balance!

Pete what coil are you using on F2?
 
NOT A HAPPY WHITES MAN AT PRESENT! :rant:

I'm not sure why a single frequency 6+kHz detector with a fixed ground balance and concentric coil would find the coins in mineralized ground.

The MXT is 15kHz so maybe a low frequency is needed.
Did your buddy try single frequency 2.5kHz with the DFX?
Maybe correlate isn't the answer with the VX3.

I know there is ground where a VLF struggles or won't work, but I don't see how the VX3 didn't work and the F2 did unless the G/B was screwed up. Did you do a manual G/B and then Lock?
 
cypearl........8" concentric.

Rob.The DFX is also mine. I'll redo the test with both machines & try your suggestions, using all separate frequencies.
I did a manual GB, but did not lock it.
It's interesting what you say about correlate, because both detectors were tuned to that.
It just seemed strange to me that all other silvers, came in strong, but not the "smalls".
Pete
 
OK...Test now done.
Coins buried at 3 1/2".....
Ground Balance checked, & locked with the VX3. All settings checked.
Threepence (15mm diam., 3/4mm thick), & Sixpence, (20mm diam,.1 1/4mm thick)Both coins 90% silver)
Detectors used: Fisher F2 -8" conc.coil.
Whites DFX - 950 Eclipse conc coil
Whites VX3 - 950 Eclipse conc coil

RESULTS:

F2.......................Clear signal on both coins

DFX: 2 Freq, Best Data......., broken, jumpy, signal.....no way would I dig the target
DFX 2 Freq Correlate...........as above
The same applied to both frequencies used separately.

VX3 3 Freq Correlate (only option) ..........................no signal
The same applied to the three separate frequencies.

All detectors gave good signal when coins on the surface.

I'm not upset any more, just disappointed, & wondering how many of these great little coins I have missed over the past two years.

I'm sure in my own mind that it is not operator error.

I just cant understand how a $200, turn on & go, Detector out performs two "top of the range" machines.

Rob, I would be quite happy to send you the coins in question, so that you can try a test in your soil.

Maybe you can figure out if I HAVE missed something in the adjustments.

The VX3 is still my main detector, but now the doubts are there.

Pete
 
Imho when I hunt with v3i I know I am not going to miss any 3'' or 4'' coins no matter the size using the stock coil 10DD. Now I just want express my opinion here, I like this detector because of that but with a cheapest model I hit coins more of a feet deep and to be specific I am using a minelab xterra with 7.5DD coil. I know v3i should to do more than this even but something I am doing wrong or what the thing I know with v3i I can find low vdi stuff with other detectors I can't. Mieralization is an enemy to me at least since it puts me on the rack can't pass it with v3i. Changing filters, Gbalance just do not seem to work, I would like to hear from others how could the detector ignore these grounds and even those tiny bits and go into deep. Thanks for help in advance.
 
cypearl,

The only detector that I know of that can ignore mineralization is a Pulse Induction but you lose discrimination for the most part. Think of mineralization as a fog and more mineralization is like more fog, it limits our vision and a detectors depth.

Some things to try working in high mineralization is higher filters, faster swing speed, smaller DD coils and I have heard TX Boost on with lowered RX Gain helps too. I'm sure there are more but I can't think of them right now like Band Pass or High Pass filters. :shrug:
 
Pete has been kind enough to send the coins in question to me, so I you can try a test in my soil. Like Yazoo just posted our soil in Indiana and Illinois is mineralized and full of iron bits. So when the coins get here we will see.
I got my brother a well touted detector because of it's deep on coins rebutation. I got a signal on a deep Indian and the signal was very clear. He tried and he could get it but it was iffy and not clear. As I said we will see.
 
Today I tested 1917 Canadian 5 cents-92.5 silver 1.17 g weight and mine V3i picks them up in the gravel mix type soil at 6.5 " jumpy but good silver VDI and at 4.25 " solid signal and good VDI I used factory High pro program no any mod.
 
I just got home today and found the coins in the mail. It's going to rain the next couple of days and then I will get them in the ground.
 
I started a post Peter. Let me know what you want me to check.
 
Is there a chance he may have a tech issue? Bad coil or a box problem?
 
Question was answered in new post.
 
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