Cortes and the 12X10

[JT]

I just purchased a 12X10 coli for my Cortes. It is providing false signals with nearly every swing, but it seems okay when in all-metal. Am I doing something wrong?

Thanks.
Joe

 

[jabbo]

I had one on my Cortes. Was getting a lot of ground chatter with every swing. Kept it only a short while. Didn't get any more depth on a dime, got 1" more on a quarter.

 

[SkiWhiz]

This is just a thought, if a detector is ground balanced too negative for the areas you are hunting it will false alot. The Cortes can be manually ground balanced in all metal mode but is factory set in disc. mode. It might be that it is set way too negative in disc. mode for your ground. Steve.

 

[BarberBill]

Especially with the larger coil(s) which are reading more area. This is where having the preset adjusted to your ground and most used coil gives the best results or the advantage to having a machine that manually or automatically adjusts to the ground in both modes.
HH
BB

 

[Diggler]

I don't know if the factory GB is the same for the Cortes, the Silver and the Silver Sabre but I only have issues with the 10x12 on the Cortes. As mentioned, it falses on every swing even with DISC at a minimum. On the Silver and the Silver Sabre (all uMax) the 10x12 is super stable and I can get to or pretty close to MAX BOOST with NO falsing. All other coils work fine on the Cortes. The 10x12 usually stays on the Silver with excellent depth and sensitivity.

 

[JT]

Thanks to all for your replies. Can anyone recommend a coil for more depth? I recently moved to the Charlotte NC. area not too long ago so I do not have a lot of experience with the different soils here. Lately I have been relic hunting in areas that are not too trashy.

 

[BarberBill]

After thinking about your original posting, I think you might wish to call Tesoro to discuss this. I haven't tried the 10X12 on my DeLeon which is essentially the same as your Cortes, but it works well on my Eldorado which does have manual ground balance that covers both all metal and discriminate. One thought that comes to mind is I've found my DeLeon to be more sensitive than several of my other Tesoros. Have you tried turning your sensitivity down when using the 10X12 it disc. mode? In fact, I've found that most of the time with the Deleon, I do just fine with the senstivity set between 5 and 8 and this is with the either the 7" concentric or the stock 8X9 concentric. Hope this is helpful.
HH
BB

 

[Diggler]

Hey Bill, do you have access to a 10x12 to try on your DeLeon? This is not the first time I have heard of people having problems with the 10x12 on the Cortes. I have tried it several times with sens at min and still same results. I guess I will try it one more time. This time I will take special notice of all settings. Like I posted before, the 10x12 is one of my most stable coils on other uMax machines, and the Cortes works great with all other coils.

 

[Diggler]

JT, Theoretically, the 10x12 should be the best choice available for depth on your Cortes. If you do decide to send your setup in to Tesoro, or even call them, please keep us posted. This is one issue that bothers me about my Cortes.

 

[JT]

I did turn the sensitivity down, but it did not help. I will keep everyone posted as things unfold.

As usual, I thank evryone for their suggestions.

 

[Mike Hillis]

Hi Joe,
You could see if raising your disc helps any, but mostly you will need to change your sweep style. You will need to make "U" at the end of your sweep instead of the more common "V" style change of direction.
HH
Mike

 

[Diggler]

Is this "U" sweep a common practice for the 12x10 on the Cortes? Any idea why it would be necessary on the Cortes and not the Silver?

 

[Mike Hillis]

The Cortes and DeLeon are not uMax detectors and so they can't be compared to them as apples to apples. uMax, Cortes/DeLeon and H-series are all different circuit designs. The Cortes/Deleon use a more sensitive gain functionality over the uMax series. Easy to compare if you ever get the chance.
HH
Mike

 

[BarberBill]

Just got through with trying the 10X12 on my DeLeon. Some falsing in Disc. mode, worse at the higher sensitivity settings and a nickle and zinc penny both came in one notch lower on the id than they normally do, but the quarter was a solid 95 as usual. In all metal it was pretty negative for the ground around my house. I'm thinking that if one wants to use this coil regularly, on the D or C, the detector's ground balance should be set for it. I only use it once in a while on the Eldorado when I want the extra coverage or a bit more depth. With the manual GB on the Eldo it works fine. I'm not a big fan of large coils for most detecting due to the extra weight and increased masking in trashy areas, but they do have their uses. If you can find a 10.5" donut concentric to try, it may be worth considering as well for a larger coil.
HH
BB

 

[Scully]

Send your machine and both coils back into Tesoro. Your big coil needs to be "tuned" to your machine, and right now it probably is not. The coil that came with your Cortes was tuned to it at the factory so it will work perfectly, but the big was not. Tesoro does this tuning free of charge, and if you send in all the coils that you use with the machine, they will tune it so it is optimimum for using those coils. There are slight differences in coils and since the Cortes is a factory preset machine (in Disc only), the coils need to be tuned to the machine. Thats also why that big coil it works well when in the All Metal mode, because that mode is manually adjusted mode and during the GB process the machine balances itself with what every coil you have on the machine.

 

[BarberBill]

Scully, you've answered a question here that I haven't been sure about. I always figured that the manual ground balance essentially balanced the coil in use with the machine and the ground. Some posts I've read leave the impression that there was a different procedure to "tune" a coil and the machine.
Thanks,
BB

 

[Scully]

In the case of the Cortes, it balances the coil to the machine, but only when in the all metal mode. As soon as you switch to disc you put the machine into a factory pre-set GB mode, and then the coil is no longer balanced. That is why you have balance coils to machines on all preset machines, and this is done at the factory.

 

[JT]

I promised to update this email chain as things unfolded, but I do not have much of an answer. I think Scully's response above makes sense. Instead of sending the Cortes back to Tesoro I decided to return the coil and replaced it with a wide scan that is working fine.

 

[Nauti]

Scully is totally correct in what he says.A friend of mine purchased one for his cibola and had to have it tuned to his detector.Now it is tuned correctly it has improved his finds rate by quite a bit...it's a brilliant coil.