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As a big fan of Tesoro detectors; I made a Tesoro Bandido clone.
With the original coil (pictures bellow).
What to say?
This works very well, super stable, GEB is fantastic, Disc is fantastic.
AM mode works great. Threshold performs great.
There is only one flaw!
It doesn't have enough "depth" even in the air.
The Roman coin "Antoninianus" (medium large) is barely detectable at about 10cm in the air.
This is nothing strange when it comes to that older series of Tesoro detectors.
The mentioned "Antoninianus" is not of the best quality, it is badly damaged.
A better such silver-plated coin detects up to 15cm in air. "Sestecius" at about 20cm.
I also have an original De Leon.
Which with the same coil detects all mentioned coins almost 50% better and some even better than that.
Once upon a time, I achieved a lot with TGSL.
Coils were 27cm DD. The same coins were detected by TGSL over 30-35cm in the air.
But it's been many years, I haven't done anything on that topic. I literally forgot everything.
I believe that if I were to make a 27cm DD coil now; to get much better results.
But that is not my goal. My goal is to get somewhat better performance with the original coil.
Carl "provoked" me to start thinking about this in a different way, while writing on another topic.
What are all the possibilities to get better performance? Coil is therefore a "constant".
All that remains for me is to "mod" the TX&RX frontend. Pros and cons? Solutions? Ideas?
In case this is the optimum with this coil; next thing i would like to analyze is a small (20cm and below) DD coil with different inductances (read as "small") and accordingly adjusted TX&RX frontends.
Carl wrote two very interesting and educational posts on another topic, I will add a link here later.
...
I'm relying on a schematic that Carl drew years ago. Basically all those old Tesoro models are very similar. In this case, it is a Bandido detector, so the schematic is also adequate.
With the original coil (pictures bellow).
What to say?
This works very well, super stable, GEB is fantastic, Disc is fantastic.
AM mode works great. Threshold performs great.
There is only one flaw!
It doesn't have enough "depth" even in the air.
The Roman coin "Antoninianus" (medium large) is barely detectable at about 10cm in the air.
This is nothing strange when it comes to that older series of Tesoro detectors.
The mentioned "Antoninianus" is not of the best quality, it is badly damaged.
A better such silver-plated coin detects up to 15cm in air. "Sestecius" at about 20cm.
I also have an original De Leon.
Which with the same coil detects all mentioned coins almost 50% better and some even better than that.
Once upon a time, I achieved a lot with TGSL.
Coils were 27cm DD. The same coins were detected by TGSL over 30-35cm in the air.
But it's been many years, I haven't done anything on that topic. I literally forgot everything.
I believe that if I were to make a 27cm DD coil now; to get much better results.
But that is not my goal. My goal is to get somewhat better performance with the original coil.
Carl "provoked" me to start thinking about this in a different way, while writing on another topic.
What are all the possibilities to get better performance? Coil is therefore a "constant".
All that remains for me is to "mod" the TX&RX frontend. Pros and cons? Solutions? Ideas?
In case this is the optimum with this coil; next thing i would like to analyze is a small (20cm and below) DD coil with different inductances (read as "small") and accordingly adjusted TX&RX frontends.
Carl wrote two very interesting and educational posts on another topic, I will add a link here later.
...
I'm relying on a schematic that Carl drew years ago. Basically all those old Tesoro models are very similar. In this case, it is a Bandido detector, so the schematic is also adequate.
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