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:shrug:AT PRO stacked coins/silver on edge. Look for the ID wrap-around; Problem or tip? You decide!

Interesting there Jim. Maybe it hits zero when it cant identify the target...however as you said in the video the sound is correct and I would investigate the target by sound and ID. Ive seen other detectors ID get confused on that one also. Go by the tone looks like on that one.

Alan
 
Dang, your right Alan.

I was looking at the readout. I get so tunnel vision sometimes. I have to remember to listen first.
SJ
 
So, have you had a response from Garrett regarding this ?

As Alan suggests audio is the AT's strong suit just learn the language :thumbup:
 
This phenomenon is not limited just to the AT Pro. The key is all coins must be tightly together. I tried it on my E-Trac and DFX and both did the same thing. Th E-Trac nulled on 3-4 quarters held tightly together. The DFX actually faired the best. Try it with whatever detector you have. Hold the coins tightly together.
 
I'm not sure I see the problem as a huge deal, how many times is a stack of coins going to be perfectly stacked perpendicular to the coil? And what are the odds a silver coin will be mixed in with clad in that situation? I'm sure all machines have some sort of quirks that we can. Please post a picture the next time you dig up a coin configuration like that with your other machine, I would be interested to see it because I haven't in all the time I have detected.
 
I wanted to point out that on my explorer... I know it is different but. I aways dug the low vid nuber with a higher sound.. Example=4 was a platnum ring.
 
n/t
 
The only detectors I have ever had that will correctly ID stacked silver coins are Tesoros... why, I don't know. I use silver dollars. One will ID correctly, once you get four in a stack... they ID as iron.

http://www.findmall.com/read.php?10,402325,402325#msg-402325

If I understand it correctly, stacked coins become a resistor. http://en.wikipedia.org/wiki/Skin_effect

I asked about this a while back and still do not fully understand it. http://www.findmall.com/read.php?17,1304561,1304561#msg-1304561

One thing I remember is that silver dollars read lower as you stack more but nickels read higher as you stack them... that, I do not understand but it is true. This was air testing and I do not remember which machine I was using to get the VDI numbers... but I have it written down somewhere. If you have silvercoins and nickels you can probably duplicate this with the AT... it is not a design flaw, it is just the way the technology works (except I don't know why the Tejon still reads the stack of dollars with the disc at the highest setting and the other machines get lower on the disc unless it is only an audio thing). I am still interested to know... but I need the "Skin Effect for Dummies" version so I can understand it... ;-)

J
 
n/t
 
[size=large]say try that in ground let the coins sit for a month and then try it I bet you will get diffrent results[/size]
 
Coins on edge will always present a problem in both audio and visual indications. I mostly hunt with concentric coils and the coins on edge will sound off with a double blip. Blip-Blip as the coil is passed over the target. This characteristic is unique to the CONCENTRIC coil. The double blip is due to the inner and outer coil windings of a concentric coil.
The problems you're facing are caused by using a DD coil. The center strip is HOT and reacts differently to the coin on edge as does the concentric coil.
I'm not sure if Garrett can fix this or not,but your observations will encourage most to further investigate this situation. :confused:
 
Jim, could the machine be picking up each skin/layer of metal in the clad coin, did you do this test with 3 silver quarters, this machine might be that sensitive
 
Very interesting observation. This information will come in handy for those trying to learn the AT Pro.

Many detectors, including the more expensive ones, do not read all targets correctly all the time. They get fooled sometimes.

Great find on the AT Pro. Thanks for sharing.

Ray S ECenFL
 
:pulltab:An answer to your question WHY does a coin not ID as a coin when scanned by the edge instead the face of the coin. It's is very simple, all metal detectors are surface detection detectors. Metal Detectors are calibrated to ID a coin by it's surface area and metal content. If you scan a coin on it's edge with a metal detector that has a threshold you will get a double blip similar to what a nail will sound like.

To prove this take one coin and pass it face up across your search coil measure the distance at which there is a solid detection signal. Now take a roll of the same coin and pass it face up across your search coil and measure the distance at which there is a solid detection signal. Compare the two measurements and you will find there is very little difference in detection distance between the single coin and the roll of coins. This shows that the metal detector detects only the surface of the first coin in the roll and not the mass of the coin roll
.

Good luck with your test
 
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