QUEST Q20 and Q40: the “SECRET” features…

After publishing the Quest Q20 and Q40 reviews, several readers have sent me some messages about undocumented “Secret” features (i.e. not described in the user’s manuals) that could be activated on those detectors in order to have really interesting results.

Before talking about them, let me thank all those friends who, with curiosity and passion, discovered this “secrets” that will extend the amazing performances of Quest detectors.

A special “Thank you!” goes to Mr. Jason Teng, Quest CEO and Chief Designer: with kindness and generosity, has given to me further details on those undocumented features.

Of course we will be ready to receive and publish your notes about any other Q20 and Q40 (and other models too!) “secret” features!

Leonardo Ciocca
AMD Tech Team

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ENGLISH: Testing Detech 12.5″ DD and 15″ DD “Ultimate” coils for Minelab SD, GP, GPX Series

Original article by Mirco Salmi – © 2017 Smart Metal Detecting – Published on AMDTT.IT with authorization.
(Editing and translation by Leonardo Ciocca © 2018 AMD Tech Team)

Hello my fellow detectorists! I’m here to talk about two brand new coils made by Bulgarian Detech for Minelab detectors Series SD, GP and GPX, that I will test on my Minelab GPX 4500: the 12.5” DD and the 15” DD “Ultimate”.

Before describing the coils, a short introduction about the machine I’ve used is almost mandatory. The Minelab GPX 4500 is a very sophisticated Pulse Induction metal detector, designed for gold prospecting in heavily mineralized soils. A true concentrate of Australian technology, born from the brilliant mind of physicist Bruce Candy, Minelab’s founder and Chief Designer.

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ENGLISH: New XP 9″ DD HF coil/detector – Simply AMAZING!!!

(c) 2017 by Leonardo Ciocca – AMD Tech Team

It’s being a few months since the french manufacturer XP has launched the new HF 9″ coil for its flagship detector, the DEUS. The french company, very kindly, has sent to me a complete unit (including a remote control, 9″ HF and 11″ Standard coils/detectors, a MI-6 pinpointer and a WS4 wireless headphone) updated to 4.0 firmware release, needed to use the new high frequency coil.

For everyone who was astonished by the article’s title “…coil/detector…”, I’ll go straighforward to the explanation of that expression.

For years, majority of metal detectorists (Deus owners or not) has had always considerated the its coils…just coils… but this is not completely true!

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Detech Chaser: the challenge goes on…

Time is finally arrived to talk about Detech’s latest metal detector: the Chaser!

After becoming worldwide famous for their high performance coils and EDS Plus, Winner, Reacher, Gold Catcher and Relic Striker VLF analog models, the bulgarian company ran by Eng. Rumen Kanev entered the market competition of display based, digitally controlled detectors.

We were happy to receive one of the last Chaser release with firmware 1.107 (Note: when you will read this article a newest release should be installed on the machine) together with three coils: a Ultimate 9” DD, a SEF 12”x10” and the little 6”x6” sniper coil.

This is the first part of our complete review of the Detech Chaser. You will soon read a follow-on, with beach and mountain test, led by other AMD Tech Team members.

Are you curious to know more about the machine? Let’s keep reading…

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TEST: Detech Ultimate 13” for Garrett AT PRO: more power!

by Leonardo Ciocca © 2016 AMD Tech Team

People who use the Garrett AT PRO since a long time know very well its potential. With the stock coil, a DD “Smudged” 8.5”x11”, you have very good performances on different soil conditions. Obviously you cannot expect “spectacular” results from a coil that, even if very well designed, is made for general purpose treasure hunting, and fits well to beginner and expert users at the same time. It has a good depth, good target separation and, after all, it is not so heavy.

But what could we do if we want some more?

Here they come some third party manufacturers, especially from East Europe, that started making some alternative coils that could be mounted on the Garrett’s hi-end VLF machine. We, at AMD Tech Team, have already tested and reviewied a couple of them with very nice results. Now is the time to test the Detech Ultimate 13” DD, flagship coil of the Bulgarian company run by Eng. Rumen Kanev

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XP ADX 150: Lots of power, simplicity and lightweight… for everyone!

Spring has finally come and rainy days seem to have gave us a little peace. I was impatient to go back on the field because, as you may have read in the blog, during this period the AMD Tech Team was literally “loaded” of metal detectors to be tested and reviewed.

In between all those machines that were kindly sent to us, we had the XP ADX 150, distributed in Italy by Detector Center of Cervia. It’s the entry-level machine from the French manufacturer XP that, till now, was somehow a little bit neglected in comparison to its “major brothers” GoldMaxx, Mito, G-Maxx and, obviously, top of the line DEUS machine.

As we speak, XP brand is usually tied to its medium-high and hi-end models and it’s easy to forget their lower end products, especially the “little one” ADX 150…

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Riceviamo una fantastica notizia per tutti gli appassionati possessori di metal detector XP!


Il 17 e 18 Settembre 2016, in Inghilterra e precisamente in North Oxfordshire, nel cuore del Cotswolds, si avranno a disposizione ben 1400 acri di terreno da spazzolare (seguendo la normativa Inglese!).

Si tratta del Primo XP GOLD RALLY EUROPEO, con la collaborazione diretta della XP Metal Detector, aperto ai soli possessori di macchine XP.

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Finally I had the chance to complete my tests of the last Detech machine, the RELIC STRIKER.

Even though a new, top of the line model has been announced, the Detech CHASER, Relic Striker is still on top of the list of Detech’s “deep-seeking” catalog. This two word expression, in the treasure hunting jargon is related to specialized metal detectors, for hunting not so small and very deep targets, usually larger than a coin. In othedetech-relic-strikerr words, these machines are biased toward big targets (e.g. militaria and caches) at great depth.

Detech  Relic Striker is a single-frequency VLF/IB running at 4,8 kHz with a “monster” SEF (Symmetric Electromagnetic Field) 18”x15” coil. These simple informations, read by an experienced hunter, will be immediately recognized as a evident clue of a deep-seeking detector, high conductivity target oriented (copper, bronze, silver etc), great for not-so-tiny, very deep buried things and especially in highly mineralized soils.


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AMDTT sponsorizza il CWPPO

CWPPOCome annunciato qualche giorno fa, AMDTT non solo ha avuto il piacere di dare notizia dell’iniziativa promossa dalla nostra amica Sam Waters, il Civil War Preservation Project of Ohio (CWPPO – vedi LINK) ma ha voluto dare un fattivo contributo al progetto.

AMDTT ha infatti deciso di donare un Makro Pointer che verrà messo all’asta per aiutare a finanziare il bellissimo progetto ideato dalla nostra amica Sam.

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AMDTT supporta il Civil War Preservation Project of Ohio

E’ con grande piacere che vogliamo comunicare ai nostri lettori che AMD darà pieno supporto all’iniziativa intrapresa dalla nostra amica statunitense Sam Waters, fondatrice della BackYard Diggers e ideatrice del progetto Civil War Preservation Project of Ohio (CWPPO).

Sam, con la collaborazione di esperti storici, archeologi, detectoristi, esperti in relic della Guerra Civile Americana e moltissimi volontari, ha come obbiettivo quello di trovare prove concrete della battaglia che si è combattuta più a nord degli USA durante la Guerra Civile. Conosciuta come Battaglia di Salineville, si svolse in Carroll County, Ohio, tra le truppe a cavallo del Generale Confederato John Hunt Morgan e elementi dell’Esercito dell’Unione insieme alle truppe miliziane dell’Ohio che inseguirono le forze del generale Morgan per più di 40 giorni.
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Garrett Pro-Pointer AT: A.mazing T.echnology!

As announced last week, Securitaly (one of the official Italian Garrett’s distributors), kindly sent us a sample of the new  pinpointer made by Garrett Metal Detectors: the Pro-Pointer AT.

Compared to its predecessor, named Pro-Pointer, that had an incredible best-selling success, this new model is not only different in color, with an ultravisible orange, but it also introduced new exciting features that, in my humble opinion, could not be missed in a top of the line device like this.

Being lucky enough to own, with great satisfaction, the old Pro-Pointer too, I had the chance to test the “Old” vs. the “New”.

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credoddmdisplayFor a long time I’ve desired to put my hands on a Nexus metal detector. This English brand, on the market since 2004, was always tied to high power products. Previous generation of Nexus detectors’ users always confirmed this axiom, with special highlight on their detection depth capabilities. Alas, the same customers were sometimes disappointed about difficulty to control stability of those machines, especially on the field. We could indicate the Nexus detectors as “Throughbred Stallions” that need to be tamed with patience and perseverance. Mr. Georgi Chaushev, chief designer and Nexus CEO, that we will soon interview, ante up with a new generation of even more poweful metal detectors with innovative and very interesting features. Continue Reading

INTERNATIONAL-MODS: E^5BOOSTER, enhance your pinpointer performances with a simple click!

Foreword by Leonardo/”Bodhi3″

As announced some days ago (LINK) , Sergio/”Xergix”, AMDTT senior member and electronic expert, just sent me his article on the E^5Booster (read it ‘E to the 5th Power’ Booster) project. I’m so happy Sergio decided to share his intelligent idea with all the blog readers who, I have no doubts, will really appreciate his work. I want to thank Sergio again for his excellent work and also I would like to thank Mauro/”Mauroki” for the extra photos and bench and field tests of the prototypes Have a nice reading!

AMD Tech Team Director
MODS: Project E^5Booster to enhance handheld pinpointer performance.
Project and Article by Sergio/”Xergix”. (c) 2014 for AMDTT
Extra photos and tests by Mauro/”Mauroki”

1. Introduction


The official E^5Booster Logo

Its a well known “trick”, in the detecting scene, that moving a small coin or any other small metal object closer to the base of the probe (Note by Bodhi3: the probe is something like an antenna, and it’s the sensitive part of the pinpointer) of any handheld pinpointer, you will have a sort of performance boost, in detecting distance/depth, on inspected buried targets. You will easily find some videos on Youtube about this trick and I will give you some links in the ending appendix to this article.

From the electronics point of view, the explanation is quite easy: the little coin just “tunes” the probe that fundamentally is a coil with a ferrite core inside. As well as with old radios that could be tuned by manipulating a coil with a ferromagnetic core (ferrite), the pinpointer probe can be “tuned” by placing a piece of metal at the coils end, gaining sensitivity.

Leonardo/”Bodhi3” Tech Note

By placing a ferromagnetic core inside a coil, the emitted electromagnetic field will be amplified. This is due to the increased electric inductance, since it is proportional not only to the coil windings number but also to the ferrite core magnetic permeability that is much greater than the one measured with air core.

Schermata 03-2456743 alle 15.29.22In this formula we can see how inductance “L” is proportional to the windings number “N”, to the nucleus area “A”, to its length “l” and the forementioned core magnetic permeability (greek letter Mu). In simple words, the iron core increases the electric inductance that will produce a more intense electromagnetic field.

2. How E^5Booster works?

The E^5Booster essentially is a virtual small coin but, compared to this one, has the great advantage it can be “activated” by just pressing a small button without the need of moving it. This will allow to easily fix it on the pinpointer in a stable way without any mechanical moving parts. Fundamentally the E^5Booster is just a coil and a mini button that closes the circuit when pressed. Let’s try to explain the technical difference between the “coin-trick” and the “coil-with-a-button” booster. From an electronics point of view, a coin is essentially comparable to a closed coil and could strongly interfere with a LC circuit (L=Inductance, C=Capacitance) as the pinpointer probe, in the same way a ring could do. You can use a common ring instead of a coin and the result will be the same: if the coil is “open” (read “interrupted”) won’t interfere with the probe, but if we shortcircuit it with a switch button, we will transform the coil in a sort of ring that could be compared to a coin. Easy, isn’t it?

3. Let’s do it!

Everything we need to produce an E^5Booster is a coil and a switch button: the more convenient coil shape is the planar one, since it can be easily adapted to any surface, rounded as Garrett’s Propointer, Minelab’s ProFinder, White’s TRX or flat ones as with DTS Sherlock or White’s Bullseye II. The switch button should be as small as possible and I suggest to use a 0,25 mm electric wire to produce the coil. It could be varnished or insulated. The coil I’ve made has 5 windings but the number is not critical. In the first prototypes (see photos) I used a small matrix board but it wasn’t flexible enough to be applied to the pinpointer in the right way.

So I had the idea to use something flexible and I’ve placed the coil and the switch button on a floppy plastic strip taken from a blister envelope. But I wasn’t satisfied enough. So I’ve transfered the circuit on a self-adhesive neoprene strip and the result is a flexible E^5Booster that could be easily applied on any pinpointer.

4. Let’s take a look at it


This is a magnified pic of the swich button: you can buy even smaller ones but I had a lot of them at home… so I saved some money…

Primo prototipo fatto su scheda millefori

The first prototybe on a small matrix board


5. How to apply the E^Booster to your pinpointer

Applying the Booster is very easy: you just need to place it on the base of the probe when the pinpointer is turned on. Then you slowly move it along the probe (toward its tip) keeping the switch button pressed until the pinpointer will start to beep. Then you just slightly move it back until the pinpointer beep won’t stop. That is the correct position!

You can now fix it with an adhesive tape (just the coil area, leave the miniswitch uncovered).

The E^5Booster, when the switch button is pressed, will almost allow to double the pinpointer sensitivity. I’ve, together with many friends, have done many tests on different models having really brilliant performances. Obviously, if you have a cheap pinpointer that can only detect things that are very very close (some cannot detect coins over 1 cm away!) the E^5Booster will maybe allow you to extend the sensitivity to 2 cm, but on good models that are able to detect a coin 3-4 cm away, the results will be amazing!

And think about it… No batteries…No special electronics…and soooo cheap and easy to be made!


Addendum by Mauro/”Mauroki”



Yesterday, during a hunt with my Spectra V3i, I had the chance to test the E^5Booster on the field on my Propointer. Its intuitive and easy use will enhance the already great performance of the Garrett pinpointer. You just need to press the mini-switch to detect targets at greater depths well over the original capability.


PRO: E^5Booster will almost double your pinpointer performance

CONS: If not correcty fixed or protected from moisture and mud, this tiny circuit could be easily lost or have some malfunctions.

I think the perfect solutions could be, and I know that Sergio is already working at it, to have the E^5Booster in a neoprene ring that could be fitted around the Propointer, with a well protected and waterproofed mini-switch. Mmmm… I think manufacturers should work on it. Don’t you agree?


Some international videos on the pinpointer “trick”: