Nexus Coil Design

[Richard Lincoln (Sheddy)]

I see that Gary has removed all the Nexus information from his website.

I had a PM last nigh from a chap who was considering a Nexus .... he isn't considering one now! At least thats one person who won't get caught out.

[Max]

[quote=Unregistered;57554][quote=Max;57499]Hi Qiaozhi,
"There's also no point in saying "Could Nexus detect 1eur coin at 30+ cm underground with a DD 22cm diameter coil ?". This doesn't even make sense."

For me have a lot of sense. Maybe not for you, but this is your opinion , that's fine.

What I've said means its circuit has no advantage respect e.g. BandidoII or GoldenSabre circuit on the depth sector.

When I read that the secret is in the coil... I can only say that the circuit is really like many other circuits that are flying around MD scenario from the 80's.
Isn't it an 80's design with just few mods ???
Isn't it like bulgarian detectors of last 70's and first 80's ???

It is also an old polemic here about its circuit design owner and so to who belongs... that I have no intention of reopening here.

I think that Georgi is a good designer anyway, don't misunderstud my words.

But circuit of Nexus is quite similar to those I've descibed above...
old bulgarian design...
well known design... old, working one of course, but NOTHING NEW.

Ask some bulgarian guy... he would tell you if you don't belive my words.

NO BIG IMPROVEMENTS. NO BIG NEWS. ALL ABOUT THE SAME.

Coil is the secret ??? Yes. Coil is the secret of its performances, I'm sure of that.

But I still think that my homemade BandidoII could beat it on soil, test garden, meeting same coil type and dimension condition.

Belive it or not, my unit do what I've said, and is just an homemade detector + an homemade coil... nothing special. And also an old Tesoro's design.
That say everything for me.

You can really compare units using same dimensions and type of coils.

Have sense comparing e.g. a Minelab unit with 11'' DD coil with a BandidoII with 8'' DD coil ?

Or also the same bandidoII unit with an OO coil and a round concentric coplanar coil ???

11'' and 8'' are not the same thing. OO and coplanar concentric aren't the same thing.

It's like a motogp-bike vs a 250cc-enduro on speed. This have no sense.
Or comparing PIs with VLFs or apple to oranges... like you said.

I think is a very good detector that Nexus... that it's worth buy one if e.g. a TH want really good depth and disc, OK. Also if it is for sure overprized.

But nobody claim here miracles. Nobody tell me there is some "new" technology behind... that multiply depth !

There are no miracles or black magic in MDs... just good designs (that are all about the same) and good coils make the difference.

Same coil type, same dimensions, same test garden.
That's the real test bench.
All the rest is advertising.

Kind regards,
Max

"When I read that the secret is in the coil... I can only say that the circuit is really like many other circuits that are flying around MD scenario from the 80's.
Isn't it an 80's design with just few mods ???
Isn't it like bulgarian detectors of last 70's and first 80's ???"

Nice theory, but there is more to that. Bandido as all Tesoro detectors is made with Colpits oscilator on the TX. That`s the lowest end of the transmitting circuit design. With that kind of transmitter you can not run any serious competition.

Hi,
"With that kind of transmitter you can not run any serious competition."

well, one could think that way, but at the end is just S/N that is meaningful in MDs. If you use e.g. a bridge to pull-up peak-to-peak voltage to e.g. 100Vpp on your tx side... you'll get great improvements in air-tests but you'll be lost in space on real ground conditions.

Many users reported that having much more power on tx side doesn't mean having more deep detecting, not just me say that.

Of course, depends on soil too, depends on many things... you could gain e.g. an enormous advantage in depth on dry and not mineralized sand that way... like PI detectors have actually.

But then try to use it on inland sites ! not the same thing that you have in air-test, you have lot of instability, even very powerful devices become unuseful that way.

That's the problem. If you increase your noise more than your useful signal rising the tx power you actually cut away depth.

Best regards,
Max

[Unregistered]

I've been watching this forum for long time, but never bothered to register. I like the heated discussions regarding technology, but YOU TWO GUYS?? SHEESH.

Goddard, Sheddy, GROW UP THE PAIR OF YOU!!

I know, lets settle this in the only way you two seem to think possible, just GET "THEM" out and compare lengths, it's about the level of intelligence you both seem to have.

One has no valid input or ability of ANY kind and the other NONE of any worth. Go somewhere else and have your spat!

For one I don't believe EITHER of you have, or EVER will amount to anything more than a pair of anally retentive no hopers!

Go spoil for a fight on someone elses yard, or BEHAVE and be civil!!

[Qiaozhi]

Hi Qiaozhi and JC1,

YES EXACTLY, the OO format coil is the best of all worlds (according to the article on coil manufacture on this forum). The lack of saturation of the front end and thus the demodulators, makes a much better detector. I also believe that Georgi uses a balanced DIODE demodulator, NOT a standard synchronous one. This, I am led to believe is less prone to overload at the large transmit signal levels (100V+) I believe is used in the Nexus.

NOT a beginners machine.. TRUE, the Nexus is very fiddly to set up and would not be for those with no patience but as Sheddy says, it definitely does what it says on the tin.

If you look at Sashos postings, one of the designs I saw which had a OO coil was almost IDENTICAL to the schematic Sheddy said I had lied when I said it was was the Nexus, yet I think I read in one of Sashos posts, that Sasho said he knew of Georgi and his design, and it's similarity to this schematic. I was also told by the person who gave me the schematic I have, that is WAS the Nexus and that Georgi had given it to the person in question asking his opinion of the viability of the design.

The attached PDF files are what I WAS TOLD were the Nexus. If not so, then I have not lied, I was passing on a non truth which I was told. You know what I mean!

BTW you can see that there is a circuit for nulling out the residual signal using electronics, rather than inter-coil positioning. Doing it this way, Georgi (maybe) has made it PERFECTLY possible to obtain 100% or near as damn it balance!

To stop any further speculation about the Nexus schematic - this is not it!
In that case Sean, you haven't lied.

[Sean_Goddard]

Actally I prefer Detector User to the other two UK mags. There test are done on a more detailed way. Also they have free small ads at the back of the Magazine. They usually borrow detectors for the tests.

Delbert, NO THEY DON;T M8.

I've advertised and had field tests done in BOTH magazines and IF you try to "break a new machine out", the publishers will actually tell the likes of Joan Allen, and Regton that you have field test printing due, AND will send them a copy or YOUR test results BEFORE it's printed, these guys can then have their "man" do ANOTHER field test for one of their old machine proving that despite the fact nothing has changed, mysteriously the machine just got a WHOLE LOT BETTER then yours. Or maybe they drop the price, or have a SPECIAL OFFER.

Money talks. It's not competition, it's collusion and chronyism and it's ILLEGAL.

The UK mags aren't worth using as toiltet paper.

[Qiaozhi]

This is my first post. As a new member to this forum, I find it extremely disappointing that people enjoy airing their dirty laundry and publicly humiliating themselves. It was entertaining for a few posts, but now it is becoming a soap opera material that would be better left for TV-wrestling, or Jerry Springer. Each have there place, but I would hope the admins and moderators would agree with me, that it is not here.

Please don't turn this forum into a field full of rusty nails, with only an apple seed's worth of treasure.

CMB

Well said!
Come on guys - bury the hatchet. What started off as Richard airing a personal complaint on a customer service issue, has escalated into a lot of dirty laundry on display. This is no place for posturing.
As one Chinese proverb says "One mountain cannot accommodate two tigers."

[Sean_Goddard]

To stop any further speculation about the Nexus schematic - this is not it!
In that case Sean, you haven't lied.

Thanks M8 This coil config and demodulators are remarkably similar though don't you think?

In the lie department, I think I'm just as guilty as ANY manufacturer trying to create a buzz for a new forthcoming product. I gauge how successful it will be by the number of emails I get for more details. I haven't bothered editing my website for over 8 months now, no point, as all the projects I was working on have been shelved.

As for the comment above yours by "Unregistered" (sort of, mainly at myself).

I have to say on reflection he's got a point. SORRY to all on the forum for my behaviour (AGAIN). But I dont recall throwing the first rock??

I MUST stop biting at these Trolls and being an ***!

Could you email me BTW, I need to ask a favour of you.

[Unregistered]

Another Chineese proverb says "if nads bigger than a beer glass dont try to fit them in"

[Unregistered]

A Bulgarian proverb is "Ive had your money now f### off "

[Unregistered]

A metal detectorist novice proverb: "I'm jealous, so spread lies"

[Sean_Goddard]

FOLKS look at this>> http://www.essex.police.uk/news/n_co...articleId=2017

Sheddy, CREDIT to YOU!! I am humbled after reading this. I apologise profusely.

I have ALWAYS wondered WHY people when they've, "made it" keep on chasing the money though. Seems a little "off" to me, (BTW that was NOT aimed at you Sheddy) that's why I part time with the detector business and sell at VERY disounted prices. THAT's why the other UK dealers hate me. I think I outprice them most times.

[Qiaozhi]

Thanks M8 This coil config and demodulators are remarkably similar though don't you think?

In the lie department, I think I'm just as guilty as ANY manufacturer trying to create a buzz for a new forthcoming product. I gauge how successful it will be by the number of emails I get for more details. I haven't bothered editing my website for over 8 months now, no point, as all the projects I was working on have been shelved.

As for the comment above yours by "Unregistered" (sort of, mainly at myself).

I have to say on reflection he's got a point. SORRY to all on the forum for my behaviour (AGAIN). But I dont recall throwing the first rock??

I MUST stop biting at these Trolls and being an ***!

Could you email me BTW, I need to ask a favour of you.

Hi Sean,

I've sent you an email.

[Unregistered]

I see that Gary has removed all the Nexus information from his website.

I had a PM last nigh from a chap who was considering a Nexus .... he isn't considering one now! At least thats one person who won't get caught out.

Some people buy others don`t. But according to Qiaoshi

"Hi Richard,
I don't know what your personal agreement with Georgi was way back in August 2004...."

you have purchased your "Nexus" in August 2004.
In that time Gary called Georgi`s detectors the no name detector and later he called them G Hunter Pro. How it happen that you got Nexus in August 2004 when it seem that not even Georgi had one????????

The first official statement about Nexus came up in September 2005 in the Treasure Hunting magazine.

I wonder who is the liar here????

Nothing personal, but it appears that all facts exhibited on this forum so far point against your case.

I am just thinking loud by getting two and two together.
May be chasing personal agenda in this way wont get you very far, but somewhat more diplomatic approach to your problem.

[Unregistered]

I see that Gary has removed all the Nexus information from his website.

I had a PM last nigh from a chap who was considering a Nexus .... he isn't considering one now! At least thats one person who won't get caught out.

That's good or else there will be another loser who doesn't have 2 braincells to scrape together crying on Geotech because he's too stupid to learn how to use a professional detector. Someone who makes a decision based on what this guy made his decision without doing proper research is obviously IQ challenged. LOL

[Nihil Roma Maius]

Mr. Admin

This is a TECH FORUM. Is time for to block discussion out the matter of our interest.

Please, stop this for the health of this famous Tech Forum.

If Mr. Sheddy wish to discuss in the tech level of this forum, no problem. Because this is not a site for to attack the persons.

Thanks and the best wishes for all us.

Nihil Roma Maius