Detection distance, ground vs air

[WM6]

I have and use Monte NBPT test too. Small clean new nails are not same problem, than
big rusty iron wedge. NBPT test can successfully pass even some cheap Chinese detectors.

Some additional words and video of NBPT cheap Chinese MD6006 test.

Monte genuine NBPT test use US Indian Head or US Zinc Cent coin as test sample.
Using high conductive (silver and alike) coins is not big deal, cause most detectors
are able to filter out nails and then detect silver coin.

Some Monte words on NBPT test:
" I use an Indian Head Cent or a modern US Zinc Cent in the marked #1 position because they are
the same size, shape and very similar conductivity.

There are 4 nails to just be rejected. Then a coin (US Indian Head or modern Zinc cent) is placed in
the center circle marked position #1. The search coil is swept left-to-right and then right-to-left along
four (4) sweep directions marked on the Nail Board. Two sweeps for each of four directions makes
a possible eight ( 8 ) audio hits possible for the coin. Keep the search coil about 2"-3" above the nails "


Monte nail test board:



In this test I use as test sample US Indian Head 1902 one cent coin:




Detector tested is cheap (32 Euro) Chinese model MD-6006 (genuine - no mod):







MD-6006 can filter out NBPT nails and then decently 8/8 detect Indian Head coin
from all NBPT directions. Video:


https://youtu.be/NsZU8DqFrJ4

[Tibuck19]

Some additional words and video of NBPT cheap Chinese MD6006 test.

Monte genuine NBPT test use US Indian Head or US Zinc Cent coin as test sample.
Using high conductive (silver and alike) coins is not big deal, cause most detectors
are able to filter out nails and then detect silver coin.

Some Monte words on NBPT test:
" I use an Indian Head Cent or a modern US Zinc Cent in the marked #1 position because they are
the same size, shape and very similar conductivity.

There are 4 nails to just be rejected. Then a coin (US Indian Head or modern Zinc cent) is placed in
the center circle marked position #1. The search coil is swept left-to-right and then right-to-left along
four (4) sweep directions marked on the Nail Board. Two sweeps for each of four directions makes
a possible eight ( 8 ) audio hits possible for the coin. Keep the search coil about 2"-3" above the nails "


Monte nail test board:



In this test I use as test sample US Indian Head 1902 one cent coin:




Detector tested is cheap (32 Euro) Chinese model MD-6006 (genuine - no mod):







MD-6006 can filter out NBPT nails and then decently detect Indian Head coin
from all NBPT directions. Video:


https://youtu.be/NsZU8DqFrJ4

Even my TGSL can do that with nails, If the silver coin is over top the nails I have no problem detecting it, but if the nails are on top of the coin then it will not.

[Carl-NC]

would someone clarify , Is that nexus a DIY geotech detector or is this a push AD video for the nexus?

It's a mildly gray area, but if Georgi keeps it in the context of technical discussions it's fine with me. Garrett, Minelab, White's etc are also welcomed to discuss/defend the merits of their technology.

All: please stay focused on the technical issues, refrain from personal comments.

[Tibuck19]

It's a mildly gray area, but if Georgi keeps it in the context of technical discussions it's fine with me. Garrett, Minelab, White's etc are also welcomed to discuss/defend the merits of their technology.

All: please stay focused on the technical issues, refrain from personal comments.

Copy that, thanks Carl.

[Nexus]

Copy that, thanks Carl.

The US coins used in the original Monte test in actual fact create far stronger signal than any English hammered silver penny like Edward III that I have used in my version of Monte test.
Not to mention that my MBNT begins with a hammered gold coin that is only 1.5 grams and 18mm in diameter.
Besides my test is an extended edition because it is the only case of MBNT that uses nails ON TOP of the coins, not coins on top of the Iron. These are two very different conditions for detection.
Every detector user in the UK knows how irritatingly more difficult is to get small hammered silver coins compared to any modern type.

Before anyone gets again and again on smart definitions of how exactly the MBNT is done for once please pay attention of what is in my video after that think and then comment in sensible merit if possible.

[Nexus]

It's a mildly gray area, but if Georgi keeps it in the context of technical discussions it's fine with me. Garrett, Minelab, White's etc are also welcomed to discuss/defend the merits of their technology.

All: please stay focused on the technical issues, refrain from personal comments.

You are right of course. Discuss is fine with me if anyone is up for a peaceful chat.

[Tibuck19]

You are right of course. Discuss is fine with me if anyone is up for a peaceful chat.

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.

[Hyena]

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 think you forgot to write most important variable for this test: used COIL ?

11" DD? Very bad separator, try it again with some small concentric

[Tibuck19]

The coil is a 9 1/2 inch coil that I got from Dfbowers. The funny thing is, awhile ago i'm just I had tried putting a silver coin next to a nail, and the tgsl did fine, at one point I change the two 2n2907 for metal can ones, since I've been digging up bottle caps more then I did in the past. I really don't thing it has anything to do with it?

[Koala]

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]

Use nice shiny nails preferably stainless steel.

Set so the nails aren't fully rejected but give a broken tone

Then don't use headphones but the internal speaker

Bingo it will sound fine for a YouTube video

Could you use these settings in the Field

Absolutely not.

Would you dig the coin if you were using headphones and you can here the iron grunt. Probably not.

But hay it look good on YouTube

[Koala]

I think you forgot to write most important variable for this test: used COIL ?

11" DD? Very bad separator, try it again with some small concentric

Absolutely

Smaller the coil. Better the result.

[Koala]

The coil is a 9 1/2 inch coil that I got from Dfbowers. The funny thing is, awhile ago i'm just I had tried putting a silver coin next to a nail, and the tgsl did fine, at one point I change the two 2n2907 for metal can ones, since I've been digging up bottle caps more then I did in the past. I really don't thing it has anything to do with it?

Its very hard to be consistent with analog rotory dials. A small fraction of a turn can make all the difference. When I built my IDX testing it was changing a cm of more due to very small differences in the settings even though everything appeared to be set the same. A fraction of s degree on the discrimination is enough to be digging bottle caps

[EL NINO]

-my 3D test...For the 2D nailboard test, the size of the coil has a significant effect on the results ... 11 "I have bad results in the 2D nailbord test" Coils 9 ", and I have less than good results in this test ... In my the 3D-deep separation test, coils Under 9" they have bad results and on the other hand coils 9" and more have good and excellent results in the 3D test .., - here is also the height of the coil above the nails, most of the detectors work well from 0-15,20 cm above the nails, except is Tecnetics G2- 13 "ultimate - the 0-20cm does not produce a positive signal signal, it starts to pass such a 3D test and at a height of 20-25cm above the knees with a very high separation is good for detection in winter ... when it's snow-...Detectors in my 2D naiboard test and 3D test: Whites SpectraV3 -4x6" ,6x9"eclipse,8x6 "sef, 10"dd whites,12x10"sef,6x10" mars sniper coil,,...Teknetics G2 - 3.5x 6.5" nel snake ,11"dd ,13"ultimate coil,..Golden mask coin killer 15khz-5"spider,9"spider coil,.... Rutus Optima- V.2-16 khz DD23CM, DD29cm coil, rutus Argo V.3 6.6khz..- DD29 cm coil,....

[Koala]

[ATTACH]44298[/ATTACH] -my 3D test...For the 2D nailboard test, the size of the coil has a significant effect on the results ... 11 "I have bad results in the 2D nailbord test" Coils 9 ", and I have less than good results in this test ... In my the 3D-deep separation test, coils Under 9" they have bad results and on the other hand coils 9" and more have good and excellent results in the 3D test .., - here is also the height of the coil above the nails, most of the detectors work well from 0-15,20 cm above the nails, except is Tecnetics G2- 13 "ultimate - the 0-20cm does not produce a positive signal signal, it starts to pass such a 3D test and at a height of 20-25cm above the knees with a very high separation is good for detection in winter ... when it's snow-...Detectors in my 2D naiboard test and 3D test: Whites SpectraV3 -4x6" ,6x9"eclipse,8x6 "sef, 10"dd whites,12x10"sef,6x10" mars sniper coil,,...Teknetics G2 - 3.5x 6.5" nel snake ,11"dd ,13"ultimate coil,..Golden mask coin killer 15khz-5"spider,9"spider coil,.... Rutus Optima- V.2-16 khz DD23CM, DD29cm coil, rutus Argo V.3 6.6khz..- DD29 cm coil,....

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.

[Tibuck19]

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.

I believe your correct, ever since Nexus posted his video I have been obsess with this, Reading and watching video's, Nexus video is a very effective sales tool, the video even had me convince I would never find silver again with our diy detectors, Lucky like you Koala, I notice old analog detecting doing better then modern ones and they all share the something, Smaller concentric coils .

EDIT: the only ones that seam to do a fair job was Tesoro with the 9x8 concentric coil, Which is why im ordering one for the TGSL, This one https://canadiantreasureseekers.com/...x8-concentric/ I'm Sure the 7 inch might be better but I don't want to small of a coil either.