Equinox Ferrous / Iron / Steel Responses

[Steve Herschbach]

from Tin, Bolts, Washers, And Other Ferrous Items That Read As Non-Ferrous

[Steve Herschbach]

8 minutes ago, phrunt said:

My understanding of that is if I'm getting a messy VDI on a target but a good strength signal I could switch to 5khz and perhaps get a better more stable accurate VDI number? would this be correct, or is multi IQ already sorting that out for me? 

 

It just depends on the situation Simon. In general I rely on Multi-IQ but in some instances a single frequency may be better. The article above was written before Multi-IQ was out, and with single frequency you lose the frequency comparison analysis going on in multifrequency. Multi-IQ works differently than the single frequency methods described in the article. The article I wanted to post because while we all talk about conductivity and magnetism, nobody has been talking inductance, and the article points out that it is inductance that fakes us out most of the time.

Who is Laurence, the guy who wrote the information in the post above (and below)? Dr. Laurence Stamatescu, Research & Development Manager at Minelab. University of Adelaide, PhD, Physics, 1993 – 1996.

Articles by Dr. Stamatescu (behind pay firewall)

[GB_Amateur]

1 hour ago, Alluminati said:

An American clad coin has a true copper ring around the outside....

https://www.thesprucecrafts.com/what-are-clad-coins-768418

A clad coin is a coin that has multiple layers of metal in it; most current U.S. clad coins consist of an inner core of pure copper, with outer layers of a silver-colored nickel-copper alloy.

When you look at the edge of a clad coin you see a copper ring, but that is actually just the edge of a solid copper inner layer -- the core.  Think of three pancakes stacked on top of each other, the inner one being pure copper and the outer two being alloys of 75% copper and 25% nickel.

 

[Alluminati]

Understood, what I meant to say is that there is an exposed surface of copper that surrounds the coin, sorry for the confusion.

It is interesting that you say the "nickle" surface on the clad coin is also a copper alloy, that explains why the signals are still good on American clad.

I'm just doing a few things, but later I should sandwich a copper penny between two true nickle dimes to see what happens lol.

[Cal_Cobra]

On 9/26/2018 at 1:05 AM, Jackpine said:

A lot of very good points in this discussion that I agree with completely. 

A couple quick questions for those that hunt older sites where numerous types and sizes of iron, steel and rusty tin are the masking culprits. 

Is the lack of an overload indicator on the Nox a positive thing for your hunting style?  In other words would it add or detract from your ability to discern co-located non-ferrous in heavily trashed areas? 

Although I like to hear it all to get those tells we talk about I l need to try hunting with the all metal horse shoe button off in these sites if only to satisfy my curiosity about the difference in audio vs making use of the iron volume control.

Given that it's lack of audio modulation in the first 6" is (to me) a big problem, I wouldn't mind an overload function.  Perhaps not quite as sensitive as the Makro/Nokta machines tend to be (I've been to sites with them that the machine sounded like it was in a Star Wars space battle with constant overloads from sea of nail environments), but it's annoying to get a nice coin signal, only to dig a beer can that's two inches deep. 

[GB_Amateur]

33 minutes ago, Cal_Cobra said:

...It's annoying to get a nice coin signal, only to dig a beer can that's two inches deep.

Better than 12 inches deep!  ?

Seriously, those are the more difficult ones for me both in terms of fooling me and worse, causing me to dig deep.  The modulation, both in the search mode and with the pinpoint mode plus the object size indication in the pinpoint mode usually give away close, large objects.  When in doubt I raise the coil and see how high I must go to lose the signal.

But I do agree that some kind of overload indication (if it doesn't cost performance in other ways) would save quite a bit of wasted hunting time.  Maybe there are other (reliable) tricks that help identify those deep, large objects but I haven't found one.

 

 

[Cal_Cobra]

1 hour ago, GB_Amateur said:

Better than 12 inches deep!  ?

Seriously, those are the more difficult ones for me both in terms of fooling me and worse, causing me to dig deep.  The modulation, both in the search mode and with the pinpoint mode plus the object size indication in the pinpoint mode usually give away close, large objects.  When in doubt I raise the coil and see how high I must go to lose the signal.

But I do agree that some kind of overload indication (if it doesn't cost performance in other ways) would save quite a bit of wasted hunting time.  Maybe there are other (reliable) tricks that help identify those deep, large objects but I haven't found one.

Agreed the deeper cans are the worst.  I always remember the raising the coil trick after I've dug the offending shallow target ?  

[EL NINO77]

... in the test firmware  for Equinox... it was also possible to set the pinpoint power ... I would appreciate the possibility in another update ...- to set it up as a very weak signal, or not on a very deep coin ....

[dewcon4414]

Let me throw this photo at you.   Notice the earring...... its a 14k 1 gram...... the chain is SS i got them both today with the Nox.   They were really SOFT tones very much like a tiny piece of can foil out there.   BOTH read 1 digit..... AND i get more depth on the earring than the chain???   Tested it on 3 Xcals both in disc and PP..... nada on the chain.   So i grabbed the CTX...... barely heard the chain except when i rubbed it on the center of the coil.   I guess i know why it wasnt found.  Let me add...... that chain was as you see it CLOSED.