testing homemade Bandido II micromax vs homemade IDX

[Koala]

IDX with a 10" DD & Bandido with 6" concentric

Both ground balanced on ferrite in discrimination mode and both with discrimination at there lowest setting

Variety of different targets the IDX walks all over the Bandido as to be expected.

However if I turn up the discrimination on the IDX to discriminate out the nail which the Bandido already does then its a close call which was a surprise considering the coil size on the Bandido. Yes the IDX wins but only 1/4"-1/2" depending manly on target size.

Guess I will have to make two identical coils for each for a fair test.

[ivconic]

IDX with a 10" DD & Bandido with 6" concentric

Both ground balanced on ferrite in discrimination mode and both with discrimination at there lowest setting

Variety of different targets the IDX walks all over the Bandido as to be expected.

However if I turn up the discrimination on the IDX to discriminate out the nail which the Bandido already does then its a close call which was a surprise considering the coil size on the Bandido. Yes the IDX wins but only 1/4"-1/2" depending manly on target size.

Guess I will have to make two identical coils for each for a fair test.

IDX is actually Classic.
Made "few" of those in the past and results in air were really impressive, while on soil are quite worse.
And when you rise Discrimination; even worse.
Not surprising to hear about your discoveries at all.
At the end of a day you'll find out that both are good enough to cover different soil situations.
IDX is better for "clean" soils while Bandido is superior on trashy ones.

[eduardo1979]

Ivconic is absolutely right.
I made the IDX, the TGSL and many more, and I've noticed that the IDX in difficult terrain is very slow and even more when discrimination is increased.
For the IDX work well, I had to increase the frequency to 12kHz and so the detector becomes faster and better mineralized ground.

[CDI]

Ivconic is absolutely right.
I made the IDX, the TGSL and many more, and I've noticed that the IDX in difficult terrain is very slow and even more when discrimination is increased.
For the IDX work well, I had to increase the frequency to 12kHz and so the detector becomes faster and better mineralized ground.

Hi Eduardo, which combination of tuning caps did u used to increase frequency to 12 khz?
Does depth decrease in that case?

[eduardo1979]

TX=330nF
RX=10nF

[Koala]

Been trying targets surrounded by iron.

Large copper coin surrounded by iron the Bandido is an easy winner rusty nails could be almost half the distance away

Small silver coin surrounded by iron the difference was much closer. Have to build a smaller concentric coil for the IDX. One thing that was immediately clear is separation was much better moving front to back instead as in a normal sweep direction with the DD. Opposite to what I would have thought.

Really needs to be a blinds test where I don't know where the target is. Think the B Would be further ahead as the IDX is more noisy in the iron.

[CDI]

Been trying targets surrounded by iron.

Large copper coin surrounded by iron the Bandido is an easy winner rusty nails could be almost half the distance away

Small silver coin surrounded by iron the difference was much closer. Have to build a smaller concentric coil for the IDX. One thing that was immediately clear is separation was much better moving front to back instead as in a normal sweep direction with the DD. Opposite to what I would have thought.

Really needs to be a blinds test where I don't know where the target is. Think the B Would be further ahead as the IDX is more noisy in the iron.

Long time ago i had Bandido, but small umax2 model from 1997, he had small black concentric coil, if i remember name was "polo" coil. I never dig small or big roman nail's with them, perfect disc. Not deep as IDX but he was coin magnet in range of 7 - 8".
This opinition is only for this type of coil, so i can't judge betwen Bandido and IDX, cause i used DD homemade for IDX. Also, i never tried DD coil for Bandido.

[CDI]

TX=330nF
RX=10nF

Thank's Eduardo.

[Koala]

Long time ago i had Bandido, but small umax2 model from 1997, he had small black concentric coil, if i remember name was "polo" coil. I never dig small or big roman nail's with them, perfect disc. Not deep as IDX but he was coin magnet in range of 7 - 8".
This opinition is only for this type of coil, so i can't judge betwen Bandido and IDX, cause i used DD homemade for IDX. Also, i never tried DD coil for Bandido.

IDX is only deep with zero discrimination. With enough discrimination to eliminate small rusty nails its a dead heat between the two. Auto circuit throttles the bandido back when testing in the house works much better on a coin buried under my lawn although I have not air tested away from any interference.

Because its quieter the chances of missing faint signals is much less on busy fields. With the IDX its much more likely to get missed in all the crackles and pops. Now the Bandido is up and running I will have to build a concentric for the IDX and then compare again


Looking at some YouTube clips I think the IDX is better suited to the concentric coil. There are a few showing Montes nail board test with the classic/IDX seem to much better than mine.

[CDI]

Hi Koala again, can you please post lay file of your umax ii?
Thank's