NEXUS ULTIMATE, your opinion, please

[Max]

It is fact that "clean" coins are easier to detect than ones with patina layer.
But there is also another fact; coins buried in soil for long time are also easier to detect than "freshly" buried coins.
Usually patina layer do develop on coins which are buried for long time.
But also the "hallo" effect appears on such coins.
So it is pretty complicated now. Patina prevents better detection - while "hallo" effect supports better detection.
At the end, better detection is dependable on several factors - not only one.
On other hand; eddy currents can easily develop and flow on straight and clean surface.
So, as you see; it is all conditional.
Georgi was generally very right, speaking about relation between mass and surface of item in soil.
It is not so important buried object to be massive as it is desirable to be turned face up with broader side (parallel to coil surface) - so eddy currents to evolve easier and feedback stronger response back to coil.

yes, indeed, it's so that happens

as an example many times I found small bonze scraps and pieces (from helmets and armor and other things e.g. nails) at interesting depth and MORE depth that I can actually detect same items in air

that happens quite easy using very sensitive VLF detectors and also I can detect in very hard soil "halo" alone in a couple of times, I mean detector got signal from just pieces of compact soil not metallic targets , when targets were already removed

usually one cannot detect halo in normal soil cause when soil matrix broke (during excavation) the orientation of magnetic dipoles change randomly and they mix nullifing the effect at detector but in few cases soil is so dry and compact that it's possible detect halo in the pieces removed and that's possible also using PI MD , just subtle and easy disappearing once soil is disturbed

I stongly think that in very long time oxidation processes act on the soil matrix and disperse metallic compounds around, then something happens , maybe ionic exchange and flow of small earth currents in the matrix (cause of minerals in the soil and presence of a metallic mass of the target) and thus halo probably it's a combined effect of different causes, then when soil broke it easy disappear cause the equilibrium in the matrix is broken and then there remains few or nothing to detect about it

the really strange thing is the few distance of detection of very small items (thin bronze as example say 0.5 cm^2 area, homemade VLF + 20cm diameter coil running at 18KHz) in air or fresh buried BUT detected at 50%+ distance in undisturbed soil, with piece buried undisturbed for at least 1800-2000years , of course with thick patina, in that case green

this kind of stuff is the proof that halo exist otherwise is not easy to explain such extra detection range with such small targets

Kind regards,
Max

[GOLDY]

Nexus ultima IB

Compared to all other detectors in its IB class to me they are the best nothing has given depth results like they have.If you looking to go deeper you going to have start thinking pulse induction PI.

Take care G

[geminis74]

For Qiaozhi
forgiveness for not answering earlier.
nexus's avatar, I have not found any that I liked and left it.
I do not say that nexus is bad, but I think before you spend so much money, it would be best to make sure what you want.
in a place where there are many ceramics, performance is really hard to get ..
in clean works fine, but unfortunately here, where are the coins are ceramic and iron sites.
therefore with my MXT the results are much better.
but I suppose it is a matter of taste, but a day trip to SPAIN, we bet a beer, to see who gets more coins : Lol:.
greetings

[GOLDY]

Nexus

He He ill take you up on that one. To be quite honest i still need to do a bit more outdoor trips with this machine to be totally confident of its total detection spectrum before i comment on it too much as i have just gotten it in but as to your question concerning high contamination sights and various undesired objects i have found that the PI detectors are much better as they work with greater voltage and when cranking up the frequency in conjunction with your discrimination levels you will have much better readings sifting through all the "crap"
Happy hunting
Goldy

[WM6]

Italian comparative test of Nexus Coronado:

It is not clear which dimension ("height" or "lenght") of Coronados OO coil was used in account.

[pelanj]

Interesting table - that means the M6 will beat Explorer in depth? I would like to know more about the test.

[WM6]

Interesting table - that means the M6 will beat Explorer in depth? I would like to know more about the test.

Test was organized by italian reseler of all tested detector. From this side all is ok- no preference.

But test cannot be taken as fully real in comparition, cause coil used are not the same in diameter and it is not clear which dimension was used for OO Coronado coil.

So test results are only real for each individual tested detector bot not fully usable for comparition.

[Qiaozhi]

Italian comparative test of Nexus Coronado:

It is not clear which dimension ("height" or "lenght") of Coronados OO coil was used in account.

Test was organized by italian reseler of all tested detector. From this side all is ok- no preference.

But test cannot be taken as fully real in comparition, cause coil used are not the same in diameter and it is not clear which dimension was used for OO Coronado coil.

So test results are only real for each individual tested detector bot not fully usable for comparition.

As always with this type of test (however honest the person) an unconscious bias can affect the results.

I notice the coil used on the M6 was the largest diameter by far, which makes me wonder how it would really perform outside of the testing area in a trashy location, where the position of the targets is unknown. I know we have often criticised the LRL and dowsing boys for planting targets in known locations to "prove" their devices work, but the same is somewhat true for real metal detectors. In a real treasure hunting situation, many of these test targets would be completely missed, unless you were searching very slowly and carefully.

A better experiment might be to get several people, who are experienced with their own particular detector, and give them 20 minutes to locate and mark the position of all targets they find in the test area. Obviously this would need to be a double-blind test. I think the results might turn out to be quite interesting.

[WM6]

Agree, except that you avoid to answer my (repeated) question which dimension is valid in case of OO coil "height" or "width" ("lenght").

[ivconic]

Italian comparative test of Nexus Coronado:

It is not clear which dimension ("height" or "lenght") of Coronados OO coil was used in account.

According to that test - XP is still the best!

Why?
Simply, just look on sketch bellow (it is 100% accurate, made in Corel)
No need for any further explanation...
P.S.
Don't know what "Standard" means for Garrett and "Super 12" for M6 coil?
It could be from 20 to 32cm in diameter.

[ivconic]

Resonant OO coil is same efficient as non resonant DD coil with size relation like this:

[WM6]

Don't know what "Standard" means for Garrett and "Super 12" for M6 coil?

Nice drawings. Thanks.

I do not know for Garrett, "Super 12" is 12" (inch) coil or about 30cm in diameter.

Of course test say nothing how perform competitors with same bigger coil. We cannot simply say better, but probably better (some detectors may become unstable with bigger coil).

[ivconic]

Nice drawings. Thanks.

I do not know for Garrett, "Super 12" is 12" (inch) coil or about 30cm in diameter.

Of course test say nothing how perform competitors with same bigger coil. We cannot simply say better, but probably better.

Most probably it is like that, but i was not sure and that's why didn't include it.
Not so important.
Garret is pretty tricky thing (already talked much about it on other topic).
Don't know nothing about M6, never saw it in my life...

Nexus is ok, fact is that it's coils are OO resonant ones.
OO resonant coils are just good, close to perfect (in theory).
But those lacking on practicality and comfort of using in some situations.
Those are just perfect on leveled soils with a lot of space...

[Qiaozhi]

Agree, except that you avoid to answer my (repeated) question which dimension is valid in case of OO coil "height" or "width" ("lenght").

6" is the diameter of one of the loops. So we should really compare the area under each coil, rather than the diameter.

[WM6]

Nexus is ok, fact is that it's coils are OO resonant ones.
OO resonant coils are just good, close to perfect (in theory).

Do you know how perform resonant DD coil in comparition to resonant OO one (with same circumference of each coil)?

I dont remeber too much reading about this question.