Nexus Coil Design

[Qiaozhi]

I Gorgi go to S Africa who will repair any Nexus then

You've misunderstood. Georgi is not going to South Africa. Richard was referring to a past event.

[Unregistered]

Qiaozh1

Quiozhi are you really Georgi

[Unregistered]

Repairs

If Grogi goes to Africa Seen Goddard will repair Nexus. But I think seen is going away for good soon, after he goes for a bear with Eric. So who will repair all those Chinese detectors he is selling on Ebay. Perhaps If Grogi stays he can repair Chinese detectors. Fit them with oo coils.

[Geto]

To all Bulgarians on this forum

I completely apologise for the offence caused by my previous post. It was an attempt at humour which has not travelled well at all and was not meant to be insulting to all Bulgarians. The insinuation that all Bulgarians are as dishonorable as George was not meant.

I have reported the post and requested that it be removed.

Hahaha..................
You think that everything is goin away just like that????
Like drinking another bear hah?
If you are so BIG I think that you should put that thig apart and show it here to all friends and .............others.!
This way you can make up to me I don't now for other ,but for me this will be ok.

I am mad because George or what ever he call himself is too arogant.
Go on desolder it to peaces and you will not find the secret!This makes me mad.
I can tell only one thing there is nothing inposible!!!!!!!
If you can this means that all we can.
So you can show it to the world at last!He gives you a green light!
He told you that he dont care and what are 3 years..........you have help him..........and now tell that he dont care?
I dont understand from electronics,much but if I were on your place I will strip and show to all.So then will see can we or NOT?
You decide.....

[Sean_Goddard]

No problems Richard, I'll help anytime, and anyone who's a member of this forum. Oh I forgot. WELCOME to the Geotech Forum . It can be mad, bad and sometimes sad, but it's always interesting!!

I have some great panel design CAD software on CD rom, that I don't use if you'd like. I have the new more versatile version, but the old one rocks for custom panels, even for designing nameplates for sheds and stuff!! Might be useful.

Unregistered, I'm not leaving the UK, just moving a LARGE bit north, and I will still do servicing, I like it it's fun. I'm geting a PO Box number though as the remote location makes it impractical for the Postie to get if the weather is bad, so I will only get my post once a week , still that's life.

I had a thought, MAYBE there IS no secret to the Nexus (no it's JUST a hypothetical suggestion) and we are missing something SO obvious. Like where do you hide a tree?? IN A FOREST of course.

Maybe we are looking too closely and need to step back and take the wider view.. The truth is out there (tm) .

[Geto]

Sean

Sean I am agree with you!
And all together will find the secret!
I am shore.But while searching will pick up some new IDEA!

[Qiaozhi]

Quiozhi are you really Georgi

No.
可是他是我的朋友。
If you really want to know (and I don't think Georgi will mind me telling you this) I designed the new Easy Meter upgrade for the Nexus Standard SE.
So perhaps I have more insight into the innards of this detector than anyone else, except Georgi of course.
Wouldn't it have been funny if we'd been the same person?

[ivconic]

Who is the best?


"This myth is Busted"
It was interesting to see "buried hoard test..." from Gary's web site
Why i am not suprised with results!?
Machines theay used are: Minelabs,Exp,Sov Big coil,Quattro,Gold Maxx Mk1
Whites, XLT,MXT,Nexus, std coil, prototype coil,Tejon with big coil...
I have experiences only with Minelab Sovereign from those used in testing.
Although test was done very descent i still have remarks;
Soil on which test was perfomed is not presenting objective (general) soil
conditions we can meet everywhere. It is only one type of soil and compounds
met in Gary's garden...sort of unique! So test results are RELATIVE!
Can not make rule of it...Although i can agree with claims that most machines
are not able to go deep as advertised..
Generaly hoard test is usefull and i can salute this.
But there is statement i can not agree with;
"I asked Georgi Can machines that that don't air test well go deeper in the soil.He
said No absolute Crap !! this is scientifically impossible if a machine air tests badly
it will detect badly in the soil despite what you read on metal detecting forums and some
manufacturers literature."
"As for the claims that some machines will detect a target at a greater distance in the
ground than in the air is as your friend Georgi put it absolute crap."

Please do not claim as "absolute Crap" things you are not ABSOLUTE SURE!
"Some machines will detect a target at a greater distance in the ground than in the air"
Yes this is true! Not "some" machines - but most machines will do! O.K. differences are
not big, but there are some differences. Otherwise, i dont know how to explain so much
simillar situations when i dug item (coin) from 20cm depth, and minute after i cant
detect same coin at 17cm in the air!? How do you explaining this!?
Only explanation is ; i am liar!? Am i? Yet this is unknown phenomena for me.
I noticed it few years ago. Was interested much about it an especially payed attention
on it. So many times i performed simillar checks to establish some rules or discover
what is all about - but without success!
BUT IT IS FACT WHICH NOBODY (NO NEXUS EXPERTS OR ANYBODY ELSE) CAN DENY! YES,VERY OLD
ITEM, SO LONG AGO BURIED IN THE GROUND WILL BE DETECTED DEEPER THAN IN THE AIR!
DIFFERENCES FROM ONE TO ANOTHER DETECTION DISTANCE WOULD BE PROPORTIONAL TO SIZE AND
MASS OF ITEM - LARGER THE ITEM, BIGGER THE DIFERENCE BETWEEN DETECTION DISTANCES AND
VICE VERSA.
So sorry if i confronted to you, but i experienced this so many times...i am prospector
too - not only constructor. Come to think; i am prospector for 20 years and constructor
just for 10 years...!?
Phenomena or call it anyway you want - it exist,it is true....and i dont have clue what
is all about!? I can not explain it yet....

Again, good test, i am not suprised at all....keep it that way!
Regards!

"Try beating it with same minelab but with a 22cm diameter coil like the one I have...
that's the point..."
Yes, this is true! I am gonna make huge OO coil for my TGSLight, just to perform some
tests....I am not that mad to take it on the real field with me!!!

"The Bandido has nowhere near the depth capability of the Nexus."
You are not familliar with phylosophy of metal detectors much, my friend!
Depth capabilities are mostly dependant on coil - not on detector itself!
So, why not? Bandido could be much better if used with XXL OO shape coil as Nexus...
But what are benefits from XXL coils??? Not suitable at all on most terrains....
"Max, you are talking rubbish. The only machine that have seen beat the Nexus for depth
is the Minelab GP4000."
THE ONLY UNBEATABLE MACHINE IS MINELAB RELIC HAWK! FOR GOOD! EVEN GREAT GP4000 IS
BABY COMPARING TO RH!
OK, friends, at some point all of you are right! i can partially agree with all your
claims. No need to argue here. Fact is that Georgi put enormous effort to make
excellent detector and obviously he done it. Is it THE BEST... or not, doesnt really
matter at all.
OO coil shape is most strange design i met. I tried to make OO coil for my TGS and
later it showed excellent performances. Yes it is very sensitive and deep setup.
I cant beat depths managed with OO coil on TGS, later with any of DD coil i made...
So, although i am not familliar at all with Nexus, i can see cleary that OO coil
applied to any descent detector can turn it to much better device...It is fact!
But, as benefits, OO setup has drawback too! Main drawback is shape not suitable
to approach to some hard spots on the field. I already posted this in TGS thread.
On leveled terrains OO shape is just perfect!
As coin prospector mostly, i am pushed to "infiltrate" in closely bush, tree roots,
stones....poky,snug places...so hard even for small DD coil. At these spots OO coil
is almost unusable....easy miss coin or other small item...

Back to "best detector..."! Am i the only one here who had pleasure to own and use
Minelab Relic Hawk ???
Everybody talking about other machines...What is whit RH? Is it forgoten already?
And later SD2200..?
You keep forgeting or avoiding to admit that Relic Hawk was,is and will be THE VERY
BEST VLF METAL DETECTOR EVER! NOT BEATABLE AT ALL!
It is not clear to me why the hell Minelab stopped producing that model? Are they
gone crazy? Instead, they started producing average detectors lately...?
Except Sovereign all other newer Minelab models are funny toys!
Must be new FCC rules or something else?

That's all from me (ignorant one)...Best regards!

[Unregistered]

Very Funny

This guy that I know who is loose with his money, bought a Nexus on Ebay just a few weeks old. On his third trip out with it he decided to call into a large shopping center at Bluewater in Kent. He wanted to pick up a copy of Treasure Hunting magazine to see if there was any advice on how to use the Nexus has he was not having much luck with it. He also wanted to get a bottle of horse oil for his wife’s thighs ( she plays women’s rugby at the weekends). Anyway the stupid fool left the Nexus on the back seat of his car. You can almost guess what happened next. When he returned to his car with the magazine and the horse oil, he could see some broken glass on the floor. Has he got closer to his car his worst fears were to come true. He looked through the broken window to discover that some RAT or SCUMBAG had broken his rear window and put another Nexus on the back seat. Now he is stuck with two.

[J_Player]

Hi ivconic,

i dont know how to explain so much simillar situations when i dug item (coin) from 20cm depth, and minute after i cant detect same coin at 17cm in the air!? How do you explaining this!?

I have heard some possible explanation with roots from the "halo effect".

This "halo effect" is said to be dis-proven by tests, but there are many people all over the world who still insist they have experienced what you described. According to the halo theory, long-time buried coins will develop a halo which make the signal stronger than coins in the air, and stronger than coins that were buried recently. When you dig a long-time buried coin, then you remove it from the soil with the halo condition, so it no longer can be detected from as many cm in the air. Testing has shown that iron objects can develop a halo from partially oxidized outer layers migrating into the soil. This will give a stronger reading until the iron object is removed from the ground, where the signal strength becomes less. But testing with non-ferrous coins showed there is no halo effect. However, there are people who still insist they observe this halo effect for non-ferrous coins that are very ancient, just as you described.

Now here is a test you can perform to determine if this "halo effect" is causing the deeper reading in the ground for you: The next time you dig a long-time buried coin, then you find the air test shows less cm detection, you can dig a new hole and bury it to the same depth as it was when you found it. Try to disturb the natural soil as little as possible, and then look at what depth you can detect it from in the new hole. This new hole should be close to the hole you dug the coin, but not the same hole, because the original hole may be halo-causing components that will invalidate the test.

If the new hole shows less detection distance than the original hole, then it would appear you had a halo in the original hole that increased the strength of signal. Also, compare the signal strength in the new hole to the air test distance. I know of no science that would support the halo theory, but I hear so many people talk about it, I think maybe it is worth the time to test to see if it is true. You may find Gorgi was correct for air test, except for the halo effect.

Best wishes,
J_P

[Geo]

Hi Ivica .
Where is the pronlem??? If Nexus is the best detector???? Ok it is the best (it does not interest me).
If OO coils are better than DD??? OK they are the best (it does not interest me).
So much discussion alone that it makes is a good publicity in the companies.
Why??
For me the best detector is the detector that has everyone of us
Regards

[Treasure Hunter]

Who can believe anything written on this forum??

Everyone has their own opinion and claim to be experts.

I'd rather buy a detector which claims to be deep and state the exact results publicly like with Nexus. If it doesn't go as deep I can have my money back, but so far no one physically proved that it doesn't go as deep as said and those who claim it is not as good detector is likely not experienced enough detectorist to set the detector up properly or else they would have gotten their money back and this talking about personal agreements which hasn't been honored is not a legitimate argument because any purchase you make should be accompanied with some sort of proof of purchase and when you have that, the law is on your side for 2 years against manufacturing defects.
All on this forum is just talk, talk, talk, talk and personal opinion.

When I believe what other detector companies says, then I have to either go on personal experience and try several ones or if I don't have the cash for that I have to go on good faith and believe it is the deepest simply because they say so and they're not prepared to publicly state exactly how deep their detectors go.
In this case it is much more likely that Nexus is telling the truth, because they are prepared to state publicly exactly what the detector can do.

In fact, due to the open approach of Nexus, that is likely to be my next purchase when I have the cash available.

[Max]

Hi,
"Secret" is in the coil. Sure. Great coil, well designed with the whole osc. part. Require lot of work I'm sure.

Great work by Georgi, no dubts ,even if the idea is old, he realized better in practice and made great/outstanding what was an average detector design.

Ivconic is right on coils (and many other things about Minelabs etc). OO are the most sensitive, I've tested 12cm diameter... wow... great depth.
I can't imagine what depth I could reach for 1eur with same dimensions of Nexus' coil and BandidoII.
Never tested.

But , as Ivconic stated, they are good just on flat soil... with just few grass or nothing at all. Other situations are far away from this condition... so maybe you can have incredible OO-coil performance and can't use them cause that don't suit your needs.

Nexus is really good for most of England's inland sites and many other places around the world, with flat soil few grass and the like.
But not for many parts of e.g. the Balcans or Greece, where you can't find too flat soil, just few grass etc. there having an OO coil could be a big problem and e.g. a DD round is much better.

For me, only right comparisions are with same coil type and dimensions on same testfields. All the rest is advertising.

I say that cause it's obvious that a greater, different, good coil could boost up performances of a good detector to the limit. So what kind of comparision you would made between e.g. a round DD and an OO ??? Even on the same unit/circuit I mean... there is too much difference!

Georgi is right, when he said that bad air test means bad in ground performances... ground performances are always lower than air-test IF "TARGET" IS THE SAME !

But TARGET isn't just the coin sometimes. That's the confusing point.
Ivconic I've experienced too that thing.

Some metals like copper, bronze, silver and others develop , as JP (that is right too) stated, an halo during years underground and that HALO makes the TARGET appear wider/greater than how it really is.

So you can detect it in ground at greater depth than in air! Happens with long time buried metals. But then if you re-bury the same coin at same depth you found it, you ,most of the times, can't detect it again... cause you have broken the sorrounding matrix, so you have dispersed the salts in all the soil around not just around the coin as they were!

Happened to me many times with copper, brass, bronze, silver so I'm totally sure of that.

Kind regards,
Max

[Unregistered]

Hi Max, have you used Nexus before or you're talking from your experience?

[Max]

Hi Max, have you used Nexus before or you're talking from your experience?

I never used one.