.925 rope chain

[ringading]

It's been to cold to hunt so been doing some testing with my 705 and a heavy .925 rope chain. I got some weird results .I first tried the 3 khz digger which should be good on silver and got a tid of -2 to +2 on the chin and +8 on the clasp. Then I tried it with the 6 “ 18.75 khz I got a consent tid of a + 8 on the chain and the clasp. My setting's on the 705 was AM,sensitivity of 22

 

[Old Longhair]

Not weird at all. You got pretty much what I would expect for TID on that item.

 

[Mark in S.E. IA]

The reason for the low ID #'s is because the MDer is only picking up each small link of the chain,,,,, not as one solid chain. The claps is a lil bigger piece of silver so it ID a lil higher number.


That's why we have a hard time finding gold chains because it's IDing only one small piece of the chain and it could be a ( - ) number, or not being able to detect it at all.

 

[bob.oz]

IMO,... The clasp is going to be the only good TID your going to get and it helps that it has steel spring in it.

 

[ringading]

Not weird at all. You got pretty much what I would expect for TID on that item.

What I think is weird that is the HF coil did better on the silver then the LF coil.

That's why we have a hard time finding gold chains because it's IDing only one small piece of the chain and it could be a ( - ) number, or not being able to detect it at all.

I do not believe that theory at all its id'ing the chain,s total mass at one time because the links are touching so it is seeing the total mass it can not see a single link that would be impossible for any detector to find.It is a lot harder to find a chain that is stretched out then one that piled together ,but I have found a bunch of gold and silver chains over the years that was stretched out and got a hit on the chain befor I got a hit on the clasp, I have never found a single link of a chain

 

[Mark in S.E. IA]

Not weird at all. You got pretty much what I would expect for TID on that item.

What I think is weird that is the HF coil did better on the silver then the LF coil.

That's why we have a hard time finding gold chains because it's IDing only one small piece of the chain and it could be a ( - ) number, or not being able to detect it at all.

I do not believe that theory at all its id'ing the chain,s total mass at one time because the links are touching so it is seeing the total mass it can not see a single link that would be impossible for any detector to find.It is a lot harder to find a chain that is stretched out then one that piled together ,but I have found a bunch of gold and silver chains over the years that was stretched out and got a hit on the chain befor I got a hit on the clasp, I have never found a single link of a chain

That's what I was told by a expert from Minelab that did most of the testing for the gold MDers. The MDer only see's the value of one link even tho they are touching each other, not the value ( ID ) of the mass..... that's what I was told.

 

[Old Longhair]

To your detector, all of those fine strands that make up the links, and all of the links that make the chain are seen similarly to foil, which the HF (more sensitive to small items) coil tends to respond to better.
I also assume this was an air test, which really is only of some relevance with respect to response on a target in an undisturbed soil matrix, if for no other reason than the machine has nothing to ground balance to.

 

[tibortt]

Excellent thoughts, thank you all, worth gold!

 

[Furious T]

This was an interesting test with interesting results. Firstly, looking at the chain, it appears that there are no links as we see in a more "conventional" necklace or bracelet....this chain was described as a "rope chain", and that is what it looks like in the photo...so, no links, but continuous strands.
My own experience is that "conventional" chains come in on the TID below what you would expect for an item (of silver) which was solid, but having the same weight as the chain...how far below depends on the size of the links. The theories about the detector only picking up one link, or TID depends on whether the links are touching each other, or whether the chain is in a ball or stretched out, in my view, all carry some weight and all have some bearing on the response we receive from our detector. Most of the very small silver chains that I have found have all had, as part of their make-up, one small part that could give off a reasonable signal, eg, the clasp, a small ID plate or a charm of some sort. Chains with large links (that I have found) usually have larger clasps (if the chain is still fully intact), others have clasps of a similar size to the links...these larger chains, while not coming in high, or in the "silver range", still come in high enough to be closes to the lower end of the silver range, or similar to a very small silver ring, on some detectors. On my X Terra 70, a fairly solid chain bracelet (without any charms etc) comes in at the higher end of the gold range. This is using the HF 10 x 5 DD coil or the MF 9" concentric coil.

The responses from this rope chain seem strange to me, but I would be interested to see what responses it gave if detected in the ground, whether coiled up or stretched out. Is it possible that there is not as much silver in the chain as 92.5%. HH