Announcement

**WM6** · 07-20-2011, 08:18 AM

Dear friend, do not violate good coil for bad detector.

**Funfinder** · 07-21-2011, 01:10 AM

Any tector has its pro and cons.
But from an absolute point of view there is no
doubt that some are for shure better:

The Garrett ProPointer is much much better than the Whites Bullseye 2!
Unbelievable a company can sell such crap to its customers!

It's really no favour for their reputation and what people think
about the quality of the rest of their products.

My dear mister "Whites M6 is god"...

And the Jeohunter goes super deep through heavy mineralized soil
without wrong pulse induction echos and erratic signals.

As almost the only company in the world Makro Group built the whole coil-pole
from plastic. And very stable and large coil, too. But the price is the weight,
and for steep woods and mountains this is simply too heavy.

Well, the Excelerator is Double D and the Jeohunters coil too.
So if that additonal tuning stuff the Jeohunter uses directly at its coil
is Detech coil compatible or no longer needed with this coil I could
achieve a very nice weight reducing (half weight!)

.

I heard that Jeohunter and Nokta Golden King are using double layer DD coils.
Don't know if this is true but finally there are just 3 spots connected with the
coil cable.

I don't know if there is some signal conversation or wave-transformation
done directly at the coil - it seems the 3 wires are:
ground (also used as coaxial shielding), D left and D right.

If i should not find any help here I will brute force and trial & error this
detech coil until the Jeohunter will work with it! It is just a simple coil -
it has to be compatible somehow!

**WM6** · 07-21-2011, 07:35 AM

Originally posted by Funfinder View Post

If i should not find any help here I will brute force and trial & error this
detech coil until the Jeohunter will work with it! It is just a simple coil -
it has to be compatible somehow!

Good! Please report about results.

**Rov** · 07-21-2011, 03:39 PM

Hi Funfinder,maybe that GTI coil from Garretts is for Imaging to suit Garretts detector specific and the winds and internal circuitry in this coil is to suit this only?an even not interchangable between other Garretts VLF detectors specifically.an not as a regular IB coil or DD configuration.Generic to use on other manufacurer detector.
without knowing the internal wiring of the GTI coil an inductance,resistance,and coil type is it a true DD style.Im not sure.?
With your current detector what are your standard coil config. resistance and inductance. to work from to match to something similar to what you want?
regards rov

**Funfinder** · 07-21-2011, 08:07 PM

@ WM6
> Good! Please report about results.

Shure, that's what you would like...

No help, just ridiculous comments from you but: "please report results"...

Perhaps I'll let you all know but just for the general sake for the MD community
because you WM6 don't understand how good IB and the famous Jeohunter works.

@ Rov
Those french Detech coils are pretty allrounders. Look here and scroll down:
http://www.nuggets.at/DETECH-SuchSpulen
you will find such 45cm coil I have already works for Whites, Garrett and Minelab!

Originally the GTI1500 and 2500 are using concentric coils (I guess for better
small stuff sensitivity like 1cm coins and nuggets etc.).
However the detech coil does an amazing job because the DD overlapping edge
is still sensitive enough for coins and the size extends the range up to 30-40cm
for smaller stuff and up to 1-2m for larger.

I'm pretty shure both halfes of the Detech coil have as good as exactly the
same (high) impedance like all TR coils should have.

At the Nexus metal detectors page (those are working analoge and without
graphical display like Jeohunter) I found some info about "resonance".

The Detech coil will work uninversally this is just a matter how much modification
but the final point is how much additional gain is achieved through "good resonance".

btw. there are 2 different factors of resonance but just one that counts:

impedance of DD coil A has to be equal to DD coil B and whole coil must not
distorted (Garrett GTI1500 shows "silver cache" if coils bumps onto root or tree)
and frequency stabiliziation by temperature etc. electronical parts.

However the MDs frequency is far away from resonance with coil size! You can't
get there no resonance like with good 2m amteur radio antenna even if you
use a 1/100 of frequency lengths magnetical loop size. This is useless.

The circuit has to be sensitive like a AM radio with just 10cm ferrite antenna.
And large MD coils receive much "better" electro-smog too.

Rov, the GTI imaging works the same with the Detech coil. Original GTI is not DD
but Detech is and works the same like Garrett ACE 250 with new DD coil.

The only problem that occures with large coil is if detector does not provide
enough field strengh by too low voltage or better (milli)-watts of transmission.
That's why PIs need strong energy source if they like to work with 1 or 2m frames.

For reverse engineering I also can try to get the Jeohunters coil work with
other detectors. And finally Detech should develope an even larger coil -
45cm is not enough for real deep seeking.

**WM6** · 07-21-2011, 08:22 PM

Originally posted by Funfinder View Post

Those french Detech coils are pretty allrounders.

.

Here my experience with Excellerator coils:
I have Excellerator II 12cm DD for Whites.
This coil can detect deeper than 20cm stock CC coils of two other USA brand MD.
Repeatedly tested in my testing plant.
And this is not a little deeper, but almost 1/3 deeper (12/13cm in comparison to 17cm).
Simply unbelievable coil.

**Funfinder** · 07-22-2011, 11:49 PM

Question first:
What do you wanna find with a 12cm coil?
Gold nuggets at a very small 5x5m area???

I found indeed golden ring and small nature gold with garrett 11cm coil.
Now I'm using it for my invented Ace 250 Super-Pinpointer. Meanwhile it
can be found here: http://www.metalldetektorenshop.at/
as Garrett Little-ACE - very nice!

But of course 1/3 deeper is a great result.

I was told the 45cm detech coil will go around 20% deeper.

I guess these coils are using more windings because
the principle with induction is the same as electro-magnetism.

No e-magnet can lift a car with just 5 windings around a core
no matter how many amps you pump through the thick wire.
Perhaps we should try MD coils with metal cores!
Even if they will weight some more.

btw. I think those 45cm Detech Excelerator are completly
the same just having different connectors for the compatible models:

Garrett GTI 1500 / GTI 2500, Minelab Explorer / Quattro / E-Trac / Safari and
Whites DFX / MXT and M6 (hey WM6, such 45cm coil is also perfect for you!)

And if we would know what coil specifications those 3 models
have it's simple to find out how they are exactly constructed even
without opening them or melting holes with soldering iron etc.

But electronical testing also is possible:
If DC flows through 1 coilcable connector to another there is no
capacitor directly inbetween. Same with diode. And I think there
exist more such indirect tests, too - inductivity tests as example.

**WM6** · 07-24-2011, 05:34 PM

Originally posted by Funfinder View Post

Question first:
What do you wanna find with a 12cm coil?
Gold nuggets at a very small 5x5m area???

Whites DFX / MXT and M6 (hey WM6, such 45cm coil is also perfect for you!)

12 cm DD Excellerator is excellent for heavy trashed area, mean on most terrains.

By the way, for gold coins and small gold 12cm goes 100% deeper than 45cm coil. Not to say how heavy 45cm is.

45cm coils go only deeper for cannonballs and panzerfaust. For Whites M6 10" DD Excellerator is optimal (regarding depth, selectivity, weight etc.).

**Funfinder** · 07-25-2011, 10:46 AM

Goldnuggets are far too seldom and small in most regions of the world
so the worth of a mini coil most of the time is for very small coins only.
And for areas where every 10cm is a rusty nail, bottlecap or pulltab.

And because of the very limited ground coverage you will search for half
an eternity on a very small site - not usable for large woods, fields etc.

Detech 45 cm coils find at 30-40 cm depth middlesized coins and not just
cannonballs while covering a much larger area - this is economical hunting
and not wasting time with "micro coils".

And the weight is really no problem - at least not with the Excelerator:
45cm coil is 850 gram plus holder (mine has just 400gram and 1,5m)

**Funfinder** · 07-28-2011, 01:48 AM

here you can see the Excelerator 45cm coil in action: 60% more depth
http://www.youtube.com/watch?v=LTmoieY8fT4

**WM6** · 07-28-2011, 07:35 AM

Originally posted by Funfinder View Post

here you can see the Excelerator 45cm coil in action: 60% more depth
http://www.youtube.com/watch?v=LTmoieY8fT4

Fake test, you cannot measure depth using metallic meter as coin holder.

Also copper and silver sre one thing, and gold another.

**Funfinder** · 08-02-2011, 07:14 AM

WM6, for you everything's a fake, I wonder how you
can live at all. Perhaps you're just a digital illusion, too.

But in that special coil test case you are not completly wrong:
Because of that 'tunnel' it is less depth, but the 60% percentage
of gain still could be right - at least for coin sized and larger objects.

**WM6** · 08-02-2011, 08:30 AM

Originally posted by Funfinder View Post

Perhaps you're just a digital illusion, too.

Why digital, why not analog?

**Funfinder** · 08-03-2011, 02:43 PM

> Why digital, why not analog?

Because this forum is digital, but perhaps you're also biochemical, mechanical, time-
space continuum, drug-induced, 4th dimensional or whatever kind of not really real!

Anyway - I can confirm the 45cm coil indeed gives around 50% better depth (at least
in air) than the Garrett GTI 1500 standard search coil - at coin level and some better
with large objects.

btw. yesterday I tried alot to get the 45cm Excelerator to work with the Jeohunter but
no chance. As precaution haven't connect the coil-contacts directly to the detection
unit, but just via some nF capicitors. There might exist some other coil-tuning,
-coil-adapting possibilities, but at the moment I won't risk anything further.

Announcement

Induction Balance with Excelerator DD?

Induction Balance with Excelerator DD?

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