DEEPERS

[Alexismex]

Good guys, just tell me please if you are using a "offset hole " like the description i make???

[ivconic]

Good guys, just tell me please if you are using a "offset hole " like the description i make???

Not really (in my case). I dont think is relevant to exactly discover behavior on such item like cola can. I took cola can along with several other items and burried into soil in my backyard. So holes are straight. Items are covered with soil again. That's in case if we are speaking of ordinary testing. Not relevant.
But what is really relevant is live experience from real terrains. So many times i had "luck" to dug huge and deep holes and later to discover cola can or simillar Al rubbish! As i pointed; ploughts! Ploughts are soils very often processed by farmers. Plow in process of furrow can go very deep, depends of type and destination, but usually from 40 to 80cm. Usuall ploughts i am visiting are near by the river. Soil there is very mealy. It is pretty often case to discover some item very deep, over the 1m in soil. Usually those items are large and heavy. Usually made from massive iron or massive Al (various Al cans, dish,pan...etc...etc).
So... plenty of simillar experiences. Summing all those experiences in conjution to experiences gained on my test field, i know,i tested and i am 100% positive that cola can is very easy to be detected at 60, 80 and even 100cm in soil. Mostly depends on detector type. As i said; Atlantis Imperator II, White's Spectrum and Colt with 10" coil are easilly detect those. No problem at all. Atlantis is very deep but suffers from other drawbacks; like slow (very slow) recovery speed and certain instabillity under certain conditions. Colt is real killer on such items and larger the coil i attach to it - easier detection at huge depths. Do i need to mention that i also have 36cm and 45cm coils for it? You just dont want to hear achieved depths with those coil, trust me! I dare to say here, cose than many members here will take me as a crackpot, so i better not say what i gained with 45cm coil and Colt.
But most illustrative should be White's Spectrum. It is easy checkable anywhere on the world, at any soil. Boosted to run pretty "hot", Spectrum is extra deep detector - real beast! Cola can on 60cm in soil (plought - like, soil) is a joke for Spectrum! I can only imagine what should we gain with newest Spectra!??? Hopefully in time we will get some reports from happy owners..
Cheers!

[Micheal]

My Garrett XL 500 (when it was working )
With 33cm coil and the little 5k resistor mod detects
coke can .......................................... 90cm(veryvery faint 95)
20 australian cent coin........................ 40cm

[ivconic]

My Garrett XL 500 (when it was working )
With 33cm coil and the little 5k resistor mod detects
coke can .......................................... 90cm(veryvery faint 95)
20 australian cent coin........................ 40cm

No wonder. XL 500 is pretty descent PI machine. I think it can perform even better on some other types of soils.

[WM6]

Good guys, just tell me please if you are using a "offset hole " like the description i make???

Alexismex, as I already wrote, I dig a vertical hole of about 60 cm placed into an (empty!!) 0,33l can of beer and re-fill hole with soil. A few years ago and this is my basic test point to test whether the detector work (worth) or not. All previously tested detectors with coils over 20 cm through successfully (some more others less convincingly) to overcome this test. For coins I have designed a special test plant and I can say only that there is no rule which would ensure that the performance in beer can detecting would be repeated in coins. But maybe can is good reference for "militaria" searching.

[Tinkerer]

Testing standard

Alexismex, as I already wrote, I dig a vertical hole of about 60 cm placed into an (empty!!) 0,33l can of beer and re-fill hole with soil. A few years ago and this is my basic test point to test whether the detector work (worth) or not. All previously tested detectors with coils over 20 cm through successfully (some more others less convincingly) to overcome this test. For coins I have designed a special test plant and I can say only that there is no rule which would ensure that the performance in beer can detecting would be repeated in coins. But maybe can is good reference for "militaria" searching.

I like the alu can as a testing standard for large targets. It is quite universal. A steel can of about similar size can serve as test target to see if the detector discriminates to full depth.

Universal standards for smaller targets are more difficult to find, because coins vary very much in their metal alloys.
A fairly reliable standard seems to be alu foil. Using the thin kitchen alu foil, cut to one inch square should be possible in most parts of the world.

An even smaller target is a one inch square piece of foil cut in half.

At what distance do the different detectors find these alu foil targets "In Air"
or buried in the ground?

Tinkerer

[WM6]

At what distance do the different detectors find these alu foil targets "In Air"
or buried in the ground?

Tinkerer

As standard coin for soil testing I use silver coin 30mm dia, and for air testing small gold coin 7mm dia 0.3gm.

One example of soil test. Fairly uniform in buried beer can test, detectors by coin test significant differentiate. Whites Matrix M6 equipped with 12 cm Excelerator coil detect silver coin in soil almost 1/3 deeper than some other detectors with double (e.g. 22cm) coil.

[Alexismex]

Ivconic, Good test when you are in the field, I believe you but I remenber some i test master hunter 7 with 10 coil ,white 5900 with 10 , Tesoro and for ultimate the Tejon with 10 ovoide coil none give a good response...i know my ground is medium to high mineralised ..i think it is the explanation !!!

[ivconic]

Yes, mostly depends of soil iself. In some soils item can not be detected even at 1/2 of depths, which usually should on some other soils.
Another factor are weather conditions, moisture, daytime etc..etc..
I noticed one interesting thing; usually early in the morning, when sun is just about to rise , Minelab Colt is working like beast. As sun rised and warm up the place, Minelab is less and less sensitive. Especially on places directly under the sun. Than i usually change the place and walk into forest to void direct strikes of the sun. Deeply in the forest, under the tree, Colt is working again very deep. So...
It is hard to compare even a same detector on much different soils and under different working conditions. So our comparsions and tests are not enough authoritative and universal. Each one of us is having own truth and experience.
Regards!

[Fred]

I noticed one interesting thing; usually early in the morning, when sun is just about to rise , Minelab Colt is working like beast.

This is like a bomb in the LRL world ... you have to dig this !

[Max]

This is like a bomb in the LRL world ... you have to dig this !

Bomb in LRL world ???

Maybe Dr. Hung has some spare match and dynamite candles to share...

BTW... I think what Ivconic reported is related to soil/surface conditions... like humidity... though I dubt LRLs have anything to do with REAL MD behaviour...

Kind regards,
Max

[Fred]

BTW... I think what Ivconic reported is related to soil/surface conditions... like humidity... though I dubt LRLs have anything to do with REAL MD behaviour...

Kind regards,
Max

mmm : " when sun is just about to rise",
Strange. Not temperature, not soil humidity as it doesn´t change yet...
Could be IR or UV...or RF from Sun

[ivconic]

mmm : " when sun is just about to rise",
Strange. Not temperature, not soil humidity as it doesn´t change yet...
Could be IR or UV...or RF from Sun

Wrong! Early in the morning, soils exposed directly to sun are changing temperature very fast. You can see that process through weak steam that appears over soil. It is fast process. 20 minutes after sun appeared, soil is much "different". Of course this is significant only in summertime. Wintertime without snow is best period for prospecting (for me).

[Fred]

Wrong! Early in the morning, soils exposed directly to sun are changing temperature very fast. You can see that process through weak steam that appears over soil. It is fast process. 20 minutes after sun appeared, soil is much "different". Of course this is significant only in summertime. Wintertime without snow is best period for prospecting (for me).

When i said it is not temperature related i meant a regular MD working in a conventional way shoud not be much influenced by a small soil temperature change.
Soil humidity perhaps, but how much does it change below surface BEFORE sun rising?
And why this MD works better in a wet (or drying) soil than in a a dry one ?

[ivconic]

When i said it is not temperature related i meant a regular MD working in a conventional way shoud not be much influenced by a small soil temperature change.
Soil humidity perhaps, but how much does it change below surface BEFORE sun rising?
And why this MD works better in a wet (or drying) soil than in a a dry one ?

Good question! Most probably because em field reaching more in a medium wet to wet soil.