Detection distance, ground vs air

[Hyena]

Moreover Tesoro 9x8 coil has very small Rx. I want try wind two coils with the same Tx (250mm diameter) with different Rx. One with 80mm and second with 115mm (2x bigger surface area). I susspect that this is simplest DIY way to increase score in such tests...

[Orbit]

In a strong mineral soil ,no VLF goes deep, 12 detectors in one test they could not even sniff 1 euro at 20 cm in the ground !So much for high hopes !Otherwise Bulgarian detectors are almighty in tests !At one of their gatherings some of my friends from Serbia were present and put the lid on the jar in the ground diameter of about 8cm at a depth of 50cm no detector has not detected that the cover!

[Tibuck19]

Moreover Tesoro 9x8 coil has very small Rx. I want try wind two coils with the same Tx (250mm diameter) with different Rx. One with 80mm and second with 115mm (2x bigger surface area). I susspect that this is simplest DIY way to increase score in such tests...

It is not just for winning the test, Although the Test does help determine a few things. In one area where I've been detecting, I found a few silver coins and countless pennies, however the pennies counts vs silver is like 20/1, I suspect there are a lot more silver coins i'm missing, I took the MiniPulse Plus there thinking when in doubt Dig it all! and Dammmmmmmm, I could not believe the numbers of nails, it is basically impossible to detect there with a Pulse induction, the best thing, is Hope this coil does a better job or, excavate first 6 inches and screen everything out HAHAHA That's not going to happen. Im still hesitant of making my own VLF coils, mostly because of the nulling knowledge that I lack.

[Tibuck19]

In a strong mineral soil ,no VLF goes deep, 12 detectors in one test they could not even sniff 1 euro at 20 cm in the ground !So much for high hopes !Otherwise Bulgarian detectors are almighty in tests !At one of their gatherings some of my friends from Serbia were present and put the lid on the jar in the ground diameter of about 8cm at a depth of 50cm no detector has not detected that the cover![ATTACH]44302[/ATTACH]

Really, Was the lid a metal one or aluminum ?

[Hyena]

No, its not just about such test. I often search near old houses and there is lot of garbage, where my DD coils struggle. I collect few coins around my house, but I am sure there is lot more, but covered with nails and other trash. Even when CC coils perform worse in higher mineralisation, I do not care (soil around is light dry sand) If they are better in separation...

I will make those coils and we will see in spring

[Orbit]

I think the aluminum lid..

[Tibuck19]

No, its not just about such test. I often search near old houses and there is lot of garbage, where my DD coils struggle. I collect few coins around my house, but I am sure there is lot more, but covered with nails and other trash. Even when CC coils perform worse in higher mineralisation, I do not care (soil around is light dry sand) If they are better in separation...

I will make those coils and we will see in spring

Cant wait to see what you come up with, Do you have snow already ?

[Tibuck19]

I think the aluminum lid..

The soil is very forgiving for metal detectors here, I was asking because not so long ago I found a Aluminum( I think) Ring cover for a Mason Jar nearly a foot deep.

[Orbit]

You can also go for a meter depends on the ground !

[Nandor]

Nice little coin you have

[Tibuck19]

Nice little coin you have

hehehe Thank you ! I found it this year with the TGSL actually, It is hardly small mind you, lol here a photo of an other coil the same size in comparison to a todays penny.
also this years find.
this coin
other side

[ionut_mtb]

Xp deus this weekend, old settlement, a lot of iron and red bricks, detecting distance on big copper coins were no more than 10-15cm, not so clear signals. i had 9" coil and fast settings (reactivity3). best depths i observe that came with wet soil, in the forest, non mineralised ground. air test are irrelevant. in clean ground, if you find a coin hoard/spill, take your PI there, your vlf cant find coins on the edge at depth. gold rings on edge, small earrings/chains/bracelets no more than 15cm with strange signals. gold ring flat, maximum 25-30cm in good ground conditions. xp in salt water, bulls***.

[Nexus]

Could you share with me the PDF of the nail test printout please, Id like to give it a try with my DIY detectors discrimination.

EDIT: I found one and my TGSL fail miserably two rusty nails, and fails to pick up a Canadian silver quarter. [ATTACH]44289[/ATTACH]

I got it from here.

https://md-hunter.com/montes-nail-bo...-for-printing/

[Nexus]

I did some experiments with two rusty nail lined up on top of a thick book and a coin underneath


couldn't understand why a YouTube video only an old vintage machine would pass this test yet all his more modern detectors failed.

Turns out it 100% down to the coil not the machine. DD are much better swinging down the nails and a concentric slightly better when swinging at 90 degrees.

again no magic going on with the vintage machine. Just comparing apples with pears by using different coils.

You probably did not pay enough attention to my video, but Nexus MP with any of my concentric coils (9" or 11.5") gets perfect detection in all directions on the MBNT no matter the condition of the nails.
Concentric coils have the advantage on this type of test, but there is a lot more to it beyond the obvious.

[Hyena]

Would you please specify that beyond? I noticed only discrimination just above ferrous and unknown GEB.