New PI machine

[ivconic]

730pps, same as Infinium.
$2120 average price, approx 1600e.

Well... i am not happy with the price!

[ivconic]

Making several Barracuda's, once, at one hand made i noticed extreme good sensitivity on small gold.
Later i never managed to repeat such performances.
At the very same hand made i also achieved some sort of discrimination where i could significantly
suppress iron response, while gold response remained the same.
Nothing especially i did at it. All was done the same as on other hand mades.
Maybe components tolerances were most proper at that particular setup!? Can't tell for sure.
Yet differences in behavior were more than obvious.
That particular Barracuda hand made was adjusted to 613pps.
So, knowing that and now knowing ATX's pps we may conclude that higher pps is not most important for
good sensitivity on small gold.
Good to have this in mind when trying to project PI's.

[soverey]

Making several Barracuda's, once, at one hand made i noticed extreme good sensitivity on small gold.
Later i never managed to repeat such performances.
At the very same hand made i also achieved some sort of discrimination where i could significantly
suppress iron response, while gold response remained the same.
Nothing especially i did at it. All was done the same as on other hand mades.
Maybe components tolerances were most proper at that particular setup!? Can't tell for sure.
Yet differences in behavior were more than obvious.
That particular Barracuda hand made was adjusted to 613pps.
So, knowing that and now knowing ATX's pps we may conclude that higher pps is not most important for
good sensitivity on small gold.
Good to have this in mind when trying to project PI's.

It would be nice to have the tolerance values of the components as it was intended by the designer ..it is clear that these are crucial, some on the forum wondered why factory machines obtain better performance than home made ones , based on same schematic (maybe even same pcb) ..I guess small things like components tolerance add up...

[Aziz]

Please do. There might be some tweaking as to get the ideal inner radius for the overlapping part, and it must be a royal pain to simulate such jagged structures, but whenever you are up to it ...

I will see, what I can make. It will take some time however. I'm quite busy these days.
Cheers,
Aziz

[soverey]

A comparison between recon pro and infinium - http://www.detectingequipment.com/in...=thread&id=688 , recon pro is also submersible.

[Aziz]

Ok guys,

I have the interesting answers now. Who's going to buy a beer for me? *LOL*
But I want to wait for the "smart gurus" answers. They haven't responded yet.


Cheers,
Aziz

[Aziz]

Hi my friend,

where did you find the sketch below? Is this your's (your assumption/speculation) or is this from Garret?

It is obvious, each coil, Rx and Tx, are made as combined letters D and omega, like this

Cheers,
Aziz

PS: Damn it!, I'm referring to the sketch at posting #4.

[Davor]

Hi my friend,

where did you find the sketch below? Is this your's (your assumption/speculation) or is this from Garret?

It is purely speculative, based on an "educated guess". The video explains using a DD coil, whereas the coil resembles a double field, with a spoke going across it. So I concluded that the DD overlap is concentrated in a form of an inner circle. My drawing is not up to scale, but if you observe the video, you'll get the idea.

IMHO it must be as easy to balance as any other DD.

[Aziz]

It is purely speculative, based on an "educated guess". The video explains using a DD coil, whereas the coil resembles a double field, with a spoke going across it. So I concluded that the DD overlap is concentrated in a form of an inner circle. My drawing is not up to scale, but if you observe the video, you'll get the idea.

IMHO it must be as easy to balance as any other DD.

Congratulations to you Davor. You are a very smart guy and you have hit the head of the nail!


To all other guys: Don't run to the patent office!


BTW, I have bought my beer by myself: 0.29 EUR (NORMA beer)

Cheers,
Aziz,
expecting some beer from Garrett this time (otherwise I won't publish any results *LOL* )

[greylourie]

It is purely speculative, based on an "educated guess". The video explains using a DD coil, whereas the coil resembles a double field, with a spoke going across it. So I concluded that the DD overlap is concentrated in a form of an inner circle. My drawing is not up to scale, but if you observe the video, you'll get the idea.

IMHO it must be as easy to balance as any other DD.

If you look at the promotional material, somewhere..... there is a view of the bottom of that coil - showing that it is potted in with resin or similar. Its quite easy to see that "delta/omega".

[Davor]

Nice, I missed that. I'm itching to see Aziz' analysis.

[Aziz]

Nice, I missed that. I'm itching to see Aziz' analysis.

The really interesting question is, whether (& how) Garrett got the "new DD" coil induction balanced.
We know, that a pulse induction coil doesn't really require induction balanced condition as the coils (TX and RX) can be damped individually and operated in the off-time sampling period.

If Garrett didn't induction balance the DD coil, then Davor has invented a new DD coil type!
(Wait!, wait!, stop running into the patent office!!! *LOL*)

Can the new DD IB coil type be induction balanced: YES!
Is the new DD IB coil type better than the standard DD IB coil: YES!
Has the new DD IB coil type a better pin-pointing feature than the standard DD IB coil: YES!
(And detecting small targets better.)
Is the new DD IB coil type detecting deeper than the standard DD IB coil: YES (but marginal and hence not relevant)!

Is the new DD IB coil type better than the standard concentric co-planar IB coil: NO!
(Ok, put your patent application into the garbage bin and go back from the patent office now .. *LOL*)

Cheers,
Aziz

PS: Where is my free beer? *LOL*

[Aziz]

BTW, the patent comment was meant to the patent-trolls of course!
But I think Garrett could have patented it. If not, only Davor would deserve it.
(Patent trolls: Now ready-steady-gooooooo!!!!! Run to the patent office!!! Hurry up man!!!! *LOL*)

Cheers,
Aziz
I'm still waiting for the free beer from Garrett! *LOL*

[Davor]

If not, only Davor would deserve it.

You are being extra funny today

[Aziz]

You are being extra funny today

That's the pure hope for a free beer!!! *LOL*

I'll make some more coil simulations before posting the results for free (beer).
Stay tuned..
Aziz