Thomas Dankowski's Metal Detecting Forum

El Nino....... good post/video.
Chris....... yes..... multi-freq has superior advantages if engineered properly. These tests displayed exactly that. (Unit sounds like a Minelab)! Those two different coil configurations AND different coil sizes can really skew the data (and invalidate the test); yet, comparable coil size/configuration may not always be available........ and ........ you have to test...what you have!

Mr. Dankowski-Tom ....you are right,,, work Concentric coil and *DD coil can work differently on the same iron objects...
I did a slightly different type of test where a detector is tested for discrimination of 12 different pieces of iron... and at the same time a test for unmasking a nickel coin under an "iron carpet"...

VERSA..23DD coil
https://youtu.be/lJ11-NSM0DU

TESORO MOJAVE- 6" CC coil.
https://youtube.com/shorts/NOXNrJUUJmc?feature=share

In this test, Tesoro Mojave had a problem with the discrimination of flat iron.. 2 pieces of iron gave a non-iron signal... but when separating a nickel coin under an iron carpet, it was able to give a partial signal or rather a hint of a signal on the coin.. I note with a really slow sweep with the coil ..

VERSA.. on the "multi-frequency" surprised me a little during this test, because even at the zero setting of the filters../Iron filter/ and /bottlecap filter/ ..it gave a non-ferrous signal only on 1 piece of iron,,and on the other piece of iron it was 50% iron signal/50% non-iron signal from a total of 12 pieces of iron... and at the same time it unmasked the coin quite well under the iron carpet from three sides of the coil sweep..

I did these tests in the spring of this year...and I included a few more...detectors...in the tests.

Vista Gold Gain 30 khz..
https://youtu.be/Iy8AixpvcPE

XP Deus1 74khz eliptic hf coil..
https://youtube.com/shorts/u4imKUG0HjU?feature=share

VERSA 1frequency 40 khz program Field..
https://youtube.com/shorts/WxFfPnERqvY?feature=share

From this test, you can see how effective you can be in detecting good targets vs. unsolicited targets in practical detection...

Very good tests. Especially..... all of the individual DIFFERENT types of ferrous/iron targets......,,,,,,....... to include flat iron. Flat iron is a achilles-heal to ALL detectors. Very few detectors give you any tool(s) to adjust/compensate/alter responses to flat iron.

Sometimes..... Single Frequency units "appear" to do better with certain iron; yet, at the compromise of unmasking.
Sometimes..... Multi Frequency units can 'false' on certain iron targets at a higher rate; yet, with a little bit of practice/skillset..... the operator can (fairly) easily discern between the 'falses'....... and ferrous/non-ferrous (co-locate) scenarios..... for enhanced unmasking capabilities.

If you dig deep into Manticore's tools/featureset....... you can easily unmask at a higher plateau.........next-Generation technological advancement/capability.

I purchased a used Vista X on recommendation from Keith Southern he said that it would work well in my iron infested site that I’ve beat to death. I’ve been wanting to try one ever since it was released. I’ve only had it a little over a month. In that time the Vista X has consistently been pulling non-ferrous out of my most challenged sites. A lot of the targets I’m getting is smaller stuff that I normally wouldn’t have heard in the carpet of nails. It has pulled several buttons and a couple of coins in several sites that I’ve given up on because I couldn’t get anything else out of these sites. The type of places that I’ve been testing the Vista X is exactly “ under the iron carpet “ and they have quit producing. The Vista X is not a machine that I would recommend using in a situation for selective digging. The disc is very exact but I never use it because I am just using it to pick non-ferrous out of the iron. A newer tone ID machine is a lot better tool in a site with plenty of good targets. If you relic hunt in old homesites that have quit producing or have a few sites that have never given anything good up yet then it is a great addition to your arsenal. It will pull non-ferrous out of the worst iron infested place you can find. I’ve only been in one place that I have struggled to get any non-ferrous out of and nothing else I have used can get it out either, it’s full of mineralized red fired bricks. Most everything non-ferrous that I’ve dug with the Vista X in these sites have mostly been partial hits. I’ve also dug a good bit of nail pieces or bent nails. Vista X not perfect but a fine tool for “ under the iron carpet “ Todd Fayard

I can 2nd Todd's experience with the Vista X in very similar site conditions. The Vista X, like all Flagship level detectors, has it's own set of attributes. That is why it will see targets other machines have missed. The same can be said about any of the top of the line units. I don't think there is an "One Best" detector, especially in difficult site conditions. El Nino's videos show this well. By hunting a difficult, hard hit site with several different capable units & with multiple coil combinations, you will squeeze the most good out that is possible. It is a very educational experience.

Todd and JCR... I think you have a really good idea how to test/detect under an iron carpet to work properly...
Your information is really informative..

It is not only the result of the test itself that is important...but we also get important information about what settings the detector can optimally work in such a separation situation..

Todd.. in my experience...with my Vista Gold Gain.... On red brick/hematite type terrains.. it is best to reduce the RX Gain to an acceptable level...but adjust the Sensitivity to a good range...and slow down the sweep with the coil...
The next thing to check is to make the GB balance of the detector correct also in Discrimination mode,,, so that the detector is tuned in Discrimination mode to a slightly positive-non-ferrous response from the terrain...
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