Single Frequency At The Beach?

[Chase Goldman]

16 hours ago, bklein said:

My chain isn’t small though…

As I stated above, eddy current circuits induced in chains and broken hoops are small and therefore mimic small targets because the resulting magnetic fields are weak.  This is more a function of the individual chain links than the total length of the chain or mass of metal.  The smaller the chain links, the weaker the resulting target signal unless there is a metal pendant or large clasp. 

Below is an example of how eddy currents flow in an unbroken ring vs. a broken ring.  The smaller eddy current circuits result in weaker detectable magnetic fields.  Similarly, in a chain made of tiny ringed links, the eddy currents flow within each link individually (despite the fact the links are in contact with each other - induced eddy currents are not the same as conducted currents developed when a voltage is applied to the chain) and the magnetic fields don't add together to make a stronger total signal from the detector's perspective.  This is what makes chains such a difficult target to detect.

[bklein]

I suspect that the small circular catch is mostly what is being detected.  I have detected such size things with a much louder signature than this when by themselves.  Perhaps the connected chain link(s) subtract some of the energy in the ring.

I just tried some experiments in All Terrain single frequency will upload a video.  I haven't yet compared gold to all terrain but see both work on the chain pretty well.  Over 100 degrees outside...

[Chase Goldman]

25 minutes ago, bklein said:

Perhaps the connected chain link(s) subtract some of the energy in the ring.

What is probably happening is near field cancellation due to counter-rotating eddy current circuits. Similarly cancellations can happen with coin spills and cache's.

[JohnnyRox]

21 hours ago, bklein said:

My chain isn’t small though…

 

[Timmysys]

The detection of gold chains is also very problematic in fresh water, especially where the soil is mineral or the water is muddy. Interestingly, many people swear by mono frequencies in this case. But what's the point of a multifreq detector if it's much better to look for a gold chain in mono? I could never set it to stable, the deus2, nox machines in mono in fresh water. The many other small targets that the plane showed drove me crazy, the small garbage and other waste that can be found on the freshwater beaches. Larger chains can be found, but thinner ones require incredible luck. It is a contradiction that I found the lightest gold chains with old classic mono freq machines. I guess the circumstances were lucky.

[Chase Goldman]

9 hours ago, Timmysys said:

The detection of gold chains is also very problematic in fresh water, especially where the soil is mineral or the water is muddy. Interestingly, many people swear by mono frequencies in this case. But what's the point of a multifreq detector if it's much better to look for a gold chain in mono? I could never set it to stable, the deus2, nox machines in mono in fresh water. The many other small targets that the plane showed drove me crazy, the small garbage and other waste that can be found on the freshwater beaches. Larger chains can be found, but thinner ones require incredible luck. It is a contradiction that I found the lightest gold chains with old classic mono freq machines. I guess the circumstances were lucky.

Yep.  Detecting is all about balancing tradeoffs.  If you want to focus your detector setup to optimize on a particular, edge-case target like thin chains, then your detector's dominant strength for target versatility (e.g., simultaneous multifrequency) may no longer apply and your non-chain recoveries or target to trash ratios may plummet.  An reverse analogy is aluminum vs. gold, if you want to find gold rings in an aluminum polluted environment, better dig all those likely pull tabs or freshness seals, because if you notch out the aluminum, your rare gold recoveries will likely be even more rare.  There really are few if any magic bullets for optimizing desirable targets other than cherry picking high conductors - which anyone with a detector can easily do regardless of skill level unless the target is at the edge of detection depth, on edge, or in heavily trash polluted grpund.

[EL NINO77]

Most beach multi-frequency programs, as well as some general programs, are based on the elimination of the conductivity of the ground, coke or salt in the water - which is actually a well-conducting electrolyte... and therefore they generally lose sensitivity to certain types of low-conductivity targets.
therefore, we cannot compare the sensitivity of these programs with the sensitivity of multi-frequency or 1 frequency operating at 20-40 or more kilohertz
additionally, the goldfield program has an additional sensitivity from the pseudo-static mode...which is quite a bit higher than the detector's normal tone program...so this can increase the differences between these programs and settings even more...

from my experience, if you want to increase the sensitivity of the beach program to such a type of target as a chain, then use a smaller coil..which naturally has a higher sensitivity to this type of target...such as this chain..

[Timmysys]

Indeed, the small coil can be one of the key factors in this topic.  You see a hunter on the net who constantly uses a small coil in salt water and finds a surprising amount of chain.  The equinox 6" coil has already brought me a chain in a very problematic, trashy place in freshwater. I hope the manticore m8 head will also be good, although it is a bit larger. I am really looking forward to the new small coil from deus 2, which they promised for this year 

[Skull diver]

4 hours ago, Timmysys said:

hope the manticore m8 head will also be good

Give it some time and You'll see what it is 💣