Minelab Go-Find

[Qiaozhi]

Minelab's AU2012903739 was an innovation patent, allowed to lapse, and was converted to a full standard patent exactly one year later.

If you look here -> http://www.ipaustralia.com.au/applic...mited/patents/
it shows AU2012903739 as a "provisional" patent. Others are listed as either "standard" or "innovation".

Is there some way to be certain that AU2012903739 is actually an innovation patent?
Since it's lapsed, there doesn't appear to be any way to get a pdf download.

[crane]

If you look here -> http://www.ipaustralia.com.au/applic...mited/patents/
it shows AU2012903739 as a "provisional" patent. Others are listed as either "standard" or "innovation".

Is there some way to be certain that AU2012903739 is actually an innovation patent?
Since it's lapsed, there doesn't appear to be any way to get a pdf download.

Okay, it looks like it went from provisional to standard.

"Provisional applications are an optional first step in applying for a standard or an innovation patent. A provisional patent application is not examined and will never have a patent granted on it, but it gives you 12 months to decide whether to go further and seek standard or innovation patent protection for your invention".

http://www.ipaustralia.gov.au/get-th...at-to-include/

[WM6]

....except that it is more or less certainly a mono type.

OK, how then can we explain that GO-Find is working well with known (MARS brand) DD coil if it is mono coil?

http://md-hunter.com/another-coil-of...0-photo-video/

[Qiaozhi]

OK, how then can we explain that GO-Find is working well with known (MARS brand) DD coil if it is mono coil?

http://md-hunter.com/another-coil-of...0-photo-video/

That's a good question, and I've already thought about that. I did send the md-hunter people a question some week's ago about whether they'd considered dismantling the coil, and they never answered.

Apparently this method can also work with a balanced coil, so I guess that's the answer. Minelab say the original is a mono coil, and the patent seems to confirm that. If we knew more about the cable connections, that would help. Unfortunately I don't want to dismantle my GO-Find to get the answer, as I only bought it second-hand out of curiosity, and I'd like to resell it in a good working state.

[WM6]

Go-Find coils are wired with electronic section by 4 wires - seems to much for mono coil, even if there are active elements in coil housing.

[kt315]

I did send the md-hunter people a question

asked ukrainian guys? =) i see yet their site http://md-arena.com/minelab-go-find-...shhaj-x-terra/
in russian and with same interior.

[Qiaozhi]

Go-Find coils are wired with electronic section by 4 wires - seems to much for mono coil, even if there are active elements in coil housing.

How do you know the GO-Find has 4 wires in the cable?

I've left a second comment on the md-hunter website. Don't suppose I'll get an answer this time either.

[Qiaozhi]

I did send the md-hunter people a question

asked ukrainian guys? =) i see yet their site http://md-arena.com/minelab-go-find-...shhaj-x-terra/
in russian and with same interior.

Since that is a Russian site, can you please ask them about the coil?
How many wires are in the cable? How was the Mars DD coil connected to the GO-Find when it uses a mono coil?

[kt315]

I had asked in two forums one is this site. yet no reply there.

[WM6]

How do you know the GO-Find has 4 wires in the cable?

I conclude this from vivisection pics posted at MD-hunter Russian forum:

[kt315]

WM6, with vaflia tech VLF (VFLEX) anywhere has to be wires for the vaflia =)

[Qiaozhi]

I conclude this from vivisection pics posted at MD-hunter Russian forum:

Aha ... eagle eyes!

In that case, the GO-Find coil is most likely the embodiment shown on Figures 13 and 14 of the patent application. Fig-14 in particular shows 4 wires.

From the description:
FIG. 14 depicts an exemplary embodiment showing
a way to construct coil 74 and coil 143 of FIG. 13. In this
embodiment, coil 151 includes an outer coil 153 and an inner
coil 156. Inner coil 156 is made of windings of Litz copper
wire with 157 and 158 representing the beginning of the first
winding, and the end of the last winding respectively. In this
embodiment, the inner coil 156 represents coil 74 of FIG. 13.
Outer coil 153 is made of Windings of twisted pair copper
wire with 154 and 155 representing the beginning of the first
winding, and the end of the last winding of the outer coil
respectively. In this embodiment, the outer coil 153 repre
sents coil 143 of FIG. 13. Of course, it is possible to have the
role of outer coil and inner coil reversed, with the outer coil
being coil 74 and the inner coil being coil 143. The windings
of the outer coil and windings of the inner coil are positioned
close to each other to allow good thermal coupling between
them. It is also possible to stack the coils on each other, rather
than having inner/outer coils.

So - strictly speaking, this is still a mono coil. The second coil is a twisted pair that is not inductively linked to the main coil, since it is bipolar and wound in anti-phase. If you were to connect a DD coil such that (for instance) the left-half of the DD was acting as the main coil, and the right-hand half was acting as the non-reactive coil, then conceivably the detector might still function, since the DD arrangement effectively magnetically decouples the two coils due to its mechanical arrangement. The problem of thermal drift would (of course) be less of a problem anyway, as the coils are already nulled.

Anybody have any other ideas or interpretations?

[WM6]

WM6, with vaflia tech VLF (VFLEX) anywhere has to be wires for the vaflia =)

Probably yes.

Or: What you see in producer public papers is no always what you get WYSINWYG (VFLEX):

[Qiaozhi]

Probably yes.

Or: What you see in producer public papers is no always what you get WYSINWYG (VFLEX):

When Minelab refer to VFLEX technology being used in the GO-Find, I think they're only talking about a digitally generated pure sine wave for the TX:

VFLEX technology generates and transmits a perfect high quality sine wave, using the same technology that is found in high quality digital audio players, and is produced without distortion. The removal of distortion maximises power transmitted from the coil, therefore increasing detection depth and sensitivity. This also results in enhanced Target ID accuracy and greater immunity to both ground and environmental noise

Just because they mention VFLEX technology, doesn't mean that it uses all the features, such as in coil signal booster and selectable frequencies. After all, the GO-Find is a single frequency machine.

[WM6]

What is this?:



So if you wish to paint your Go-Find in camo, Minelab could void your authority to operate your detector.

I could understand that "any changes and modifications" could void warranty, but "void my authority to operate my detector"? Do I need to go in Minelab jail too?

This wildmill company is now already climbing above national legal systems?