give it metal detectors with a penetrathion depth of 1m

[ivconic]

But these are old truths that we have known for a long time.
Some new "kids" only find out some things today.
I have one problem with that though.
I can't imagine how I would be able to pull such a coil through my terrain, very steep hills with lots of rocks and low bushes.
The only place where valuable ancient coins are found.
I always have in front of my eyes a rather comical picture of a Youtube advertisement for a detector that uses a huge... gigantic OO coil with which it finds a Roman "Sestertius" (a rather large coin) at about 45-50cm deep... in a fairly uniform and "clean" soil!
Whenever I want to laugh out loud, I look for that fiercely tragic YouTube video!
Even Benny Hill is no match for that kind of humor!

[ivconic]

I always have problems with that measurement system... 18 inches is 45.72cm !!!
I always have to consult a calculator to understand what it is about.
In that case, it is no wonder to detect a coin at 50cm.
I remember a long time ago, many years ago, some smart man wrote in a patent that the maximum useful range on a coin is about the diameter of the coil.
In that case, Paul, you have not failed miserably!

[moodz]

Hey Moods,

Not too shabby man! I mean an IB machine, running at 19KHz, and against a nickel? I'd be detecting with it any time any day of the week. It might be a little heavy of a beast but still quite impressive. Please don't tell me it's a nexus standard mp, maybe with a special request for its coil. Because I have a crush on that beautiful thing .

Anyway, best of luck!

Thanks .. its a custom job ...still working out some details like auto ground balance ... not a fan of manual GB.

[Nightryder]

I can pick up a nickel at 50 cm with GB on and 18 inch DD coil in the backyard .... its not a PI though ... its a single frequency VLF @ 19 Khz.

Hey Moods,

Not too shabby man! I mean an IB machine, running at 19KHz, and against a nickel? I'd be detecting with it any time any day of the week. It might be a little heavy of a beast but still quite impressive. Please don't tell me it's a nexus standard mp, maybe with a special request for its coil. Because I have a crush on that beautiful thing .

Anyway, best of luck!

[moodz]

I can pick up a nickel at 50 cm with GB on and 18 inch DD coil in the backyard .... its not a PI though ... its a single frequency VLF @ 19 Khz.

Pic below shows nickel detection in the latter part of the target level trace.

[Nightryder]

There is probably no way to detect a coin at 1m. I have seen a very high-powered PI detector with a 32cm coil detect a US nickel at roughly 50cm. The Garrett ATX will detect a US nickel at 43cm. I don't know that any of the projects posted here can do anywhere near that, probably more likely 30cm max. With some heavy mods they might get close to 40-50cm but you will need a really good understanding of PI to get there, and a big battery.

That's with the ATX 12 * 10" DD coil. With the 13 * 11" DD coil, I detected a US nickel at about same distance however sensitivity was at 9. I couldn't increase sensitivity due to EMI around me. Which makes me believe detection distance can be more than 45 cm. Even a lot more with a 13" mono coil which I don't have yet. Test was performed in my backyard, GB and Iron Disc were off. It's a straightforward machine when compared to GPX5000

[kt315]

What is the best metal detector of the metal detectors shown here in the forum in terms of penetration depth and discrimination
Levin

begin from TGSL. no penetration depth but you will get a fun.
also, i strictly recommend you to order a book ITMD just now. it will give you good perspective.

[Riss]

We still have extremely low technological development and limited knowledge. We cannot create a VLF directional antenna , which would improve the depth of metal detectors . Even if we create a detector registering a coin at 1 meter , an even greater challenge is creating the technology to quickly mine the coin from that depth without risk of damaging it . And in the layer with depths of 20 cm - 1 meter there are many valuable objects... Because the treasure hunter's efficiency is the area and depth , shaken per unit time ( the searched volume of soil ) , I personally would work with my old detector , but I would give a lot of money for fast mining technology (machine ) . In real work a lot of time is wasted to mine the coins - in a geometric progression from the depth of the hole. And so , Levin - did you dig the three holes? How many such holes can you dig in for 8 hours ?

[Orbit]

The PI projects will give you the most depth, maybe 30cm on a coin, but they have no discrimination. The VLF projects can discriminate but can't go as deep. I'll leave it to others to suggest a "best" project because I don't know, but you probably won't be happy with any of them based on what you want.

[Orbit]

[КУОТЕ=Царл-НЦ;н412103]Левине, питање да ли желите да ископате рупу од 1м ме не занима. Али оно што тражите је далеко изнад могућности тренутне технологије. Чак и откривање новчића на 50 цм захтевало би огроман напор и готово сигурно не би било дискриминације. Предлажем да уђете на форуме за опште откривање и видите где је тренутно најсавременије стање. Мало је вероватно да ћете направити нешто боље.[/КУОТЕ]

[Carl-NC]

Levin, the question of whether you want to dig a 1m hole is of no concern to me. But what you are asking for is well beyond the capabilities of current technology. Even detecting a coin at 50cm would take a monumental effort and would almost certainly have no discrimination. I suggest you get on general detecting forums and see where the state-of-the-art is right now. You are very unlikely to build anything better.

[Riss]

What is the best metal detector of the metal detectors shown here in the forum in terms of penetration depth and discrimination
Levin

As I expected - you have no desire to dig holes . Then why are you asking again and again about a deep detector ? I remembered - a friend muttered to himself : ,, I have to cut hay for the donkey again...’’ Someone asked him -ok, but what's your donkey for? The answer was -how so for what ?- to transport the hay !

[Carl-NC]

The PI projects will give you the most depth, maybe 30cm on a coin, but they have no discrimination. The VLF projects can discriminate but can't go as deep. I'll leave it to others to suggest a "best" project because I don't know, but you probably won't be happy with any of them based on what you want.

[Levin]

What is the best metal detector of the metal detectors shown here in the forum in terms of penetration depth and discrimination
Levin

[ivconic]

All this story is primarily related to finding coins, small jewelry and smaller pieces of precious metal.
Of course, there is also a continuation of the story, which is the search for large items, deposits and hoardings.
And in that case, everything that is written still applies.
With a note; that any better detector will suddenly become "deep" when dealing with such large pieces of findings.
Deus with a 22.5 cm coil very successfully finds such finds at depths of up to 1 m and a little more than that.
Because in 99% of cases it is iron or alloys with iron.
And such a mass gives a very strong signal even with coils with a smaller diameter.
Ever since I've had Deus, which is since 2012. I've had several cases of such digs. Up to 1m and something over that.
If the "target" is big enough; each better detector becomes "depth" or "deep" detector.
And we often mentioned the "halo effect" over the years.
If the target is of such a composition and if it remains in the ground long enough, a so-called halo effect develops around
the target and the target becomes "shallow", "bigger" and easier to detect.
In most cases, these are worthless findings. Much joy when detected - greater disappointment when dug up.
Several great discoveries of very valuable finds, which I remember for my entire "career", are in 100% of cases accidental and lucky finds.
I am not aware of any such deliberate finding.
And here, in a couple of posts, I briefly wrote everything that is important for the detectorist to keep in mind.
And from this story, I hope it is clear to you how much and what the role and importance of "depth" actually is.