How is the Garrett ATX coil organised?

[JoyJo]

Are you interested in the design of the coil from Gerrett atx? Are these two rings (a large coil and a small coil connected in series) or is it a DD coil whose intersection zone (CX zone) is made in the shape of a small ring?

[Carl-NC]

DD coil.

[Orbit]

Does anyone have a pcb schematic inside the ATX coil? Or a better picture of the top and bottom?

[Nightryder]

Credit goes to Carl-NC. He shared this pic with me.

[Altra]

In the mono coils there is a protection pcb. This automatically disconnects the RX coil from the pre-amp during transmission and flyback. One guy posted a poor photo of pcb, the same photo Orbit posted today Some Good info here.

https://www.geotech1.com/forums/foru...dification-atx

A second thread . Some people adapted the Infinium DD coil to the ATX. The Infinium coil.is apparently well balanced which would allow using it and not damaging the pre-amp.

https://www.geotech1.com/forums/foru...ew-PI-machine=

[JoyJo]

DD coil.

Very interesting! And what is the reason for this form? The advantages of such a design are not quite obvious to me. ATX is a pulse detector. Does this shape of the coil give some kind of win?

[Carl-NC]

It probably has a response pattern similar to a concentric coil.

[Nightryder]

The ATX DD coil most sensitive area is the center. The pinpointing & Iron Check (grunt sound) features do not work without a DD coil.

[Orbit]

Very interesting! And what is the reason for this form? The advantages of such a design are not quite obvious to me. ATX is a pulse detector. Does this shape of the coil give some kind of win?

It doesn't have to be that shape one can wind the tx coil together with the rx to look like a mono coil. And the advantage is the easy production of the coil itself. The electronics in the coil allow for early sampling after the tx pulse ends! I did a bifilar wound coil tx and rx are wound together but without timely shutdown the sample must move in my experiment at 40us - 45us. With automatic shutdown, it is possible to take a sample early with' at of 10us. That is the explanation that someone mentioned that he made a similar coil on ATX but had poor detection range.

[EL NINO]

This arrangement of the 12x10"ATX coil... allows the PI detector to achieve very good sensitivity and range on very small targets... which is comparable, for example, to the 5x10"DD Infinium coil used on the ATX... while the 12x10" ATX coil still maintains a greater range on coin targets..due to its size..

Both coils pass this test: https://www.youtube.com/watch?v=OwsfoCwj7vM

[ivconic]

Interesting coil design. Are there any advantages over others or is it just a fad?
Other; I looked through the posts and links and came across an important contradiction!
Someone wrote that the inductive balance is not important at all with those coils, and yet someone else specifically mentioned that the inductive balance with that coil is flawless!?

[EL NINO]

Let's say it combines the sensitivity of a concentric coil to small targets...with the resistance of a DD to ground mineralization...the range to medium and large targets is similar to a DD coil of this size...
In my opinion, it's a really good compromise.. between a CC coil and DD coils..
Although a regular DD coil of this size /for example a 10 x 14" DD coil Infinium ../ could be even more resistant to ground mineralization..
but I would have to compare such a coil directly with an ATX DoD coil
..In my opinion, the inductive balance of the coil must be within a certain tolerance....because it uses VLF ..or VLF-like iron discrimination.....

Purely theoretically, this type of coil or its modification could work reasonably well on VLF detectors..