Could Not Make Eqx To See The Target

[nordic]

Would it be correct to assume that multi-freq is outperforming any single freqs in most cases, except certain special need situations? Because that is what I witness normally - the depth and accuracy is far superior when using multi.

Also, looking at the test box, it looks pretty small, wonder if there is a chance of magnetic field leaking through sides of the box too, as in, meeting no obstacles through air.

On a side note, perhaps nothing new to some more experienced people here..

When looking at the RX signal scope, any magnetic, ferrous material was literally not only shifting the phase a lot, but also rising the whole impulse in the RX channel to such extents that any small signal from desirable object may become lost. ML take on this is that they are looking for small/fast signal changes in the context of slow and big as coil moves over them, primary reason why correct swing speed is rather important. Also, their RX line has about +/-1.6V (after the coil amp) of headroom, so any large ferrous object may potentially exceed/clip this, as a result, cutting off important details. In other words, perhaps, it make sense to distantiate the coil from the ground in certain conditions to get more headroom for the signal. I did notice this a while ago while detecting in tall grass, about 5-6" tall, and yet finding coin size objects 7-8" deep?

Further looking at the scope, desirable objects mostly effect the very start of the RX wave signal, while all ferrous cause a significant shift and effect middle of the RX wave signal. 

It is also important to mention, I think, that it seems, that Nox TX strength and RX gain never change in analog domain, and perhaps digital too. The user sensitivity adjustment is merely an adjustment of the signal floor threshold. Lower it goes (higher sensitivity), more detail (and noise) it will start to process. 

[EL NINO77]

My observations and tests show that Equinox alone 1f frequencies work with substantially reduced TX performance (about 1/10 Standard Tx) -a similar to the reduced Tx performance in Beach 1, and Beach2 ... and Tests even confirm that under certain conditions1 frequencies 5Khz, 10.khz, and 15khz, I will be more resistant than Beach 1 and 2 programs with lowered Tx because Beach programs contain frequencies 20 and 40 khz - .... which will be unstable under the conditions of the strongest mineralization.
And this is a disadvantage in other multi-frequency programs in Equnox .. Park, Field and Gold .... these programs already on the highest mineralization (33% magnetite) can not stably and properly debug GB ....
 For comparison .... Multifrequency programs Park, Field, Gold I will work stably only up to 12% magnetite mineralization ,,, and 1Frequency programs 5Khz, 10khz, and sometimes 15khz, I can work stably up to 33-40% magnetite mineralization ..
Of course ... count on the smaller depth range ... so maximum 50% -60% depth .... but the detection is stable ..

1F separate frequencies 20Khz and 40Khz I will work well to 12% mineralization ... for example at 40Khz, and high sensitivity 23-24 .. in the program Park1..I have no problem detecting 1.15gram open gold earrings in at a depth of 4 "´ = 10cm ... under 12% magnetite mineralized by "Black sand" test box.. :

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But 1F frequencies of 20khz and 40khz will no longer work steadily on mineralization of 33% magnetite ..- and that's the problem with all multi-frequency programs in Equinox-Park1, Park2, Field1, Field, Gold1, Gold2- because they also contain frequencies of 20 and 40 khz. ..

1F -15khz frequency is also slightly less resistant in 33% magnetite mineralization, but it is more resistant than 20khz and 40khz frequencies.

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It would be interesting if the minelab of Equinox could create a "multi-frequency program" for extreme mineralization ... containing these 3 more resistive frequencies 5Khz-7.8Khz-13Khz ..

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We recommend everybody to test and compare how extremely 1F 5,10,15 khz frequency works in combination with recovery speed 6-7, low iron bias setting and Discrimination set to 0, + 1 or more ..

You will be surprised how strong mineralization Equinox can manage ..

 

[Chase Goldman]

On 1/27/2020 at 5:12 AM, nordic said:

Also, looking at the test box, it looks pretty small, wonder if there is a chance of magnetic field leaking through sides of the box too, as in, meeting no obstacles through air.

Air actually has the opposite effect than what you are describing.  It is a very complex situation, but the bottom line is that test configuration is likely more limiting than in the field.

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It is also important to mention, I think, that it seems, that Nox TX strength and RX gain never change in analog domain, and perhaps digital too.

Do you mean time and frequency domains here?

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I did notice this a while ago while detecting in tall grass, about 5-6" tall, and yet finding coin size objects 7-8" deep?

Did you verify that the signal could not be picked up at ground level too or is this merely anecdotal that you found you were only picking up deeper targets in the tall grass.  Furthermore, the vegitation could be signifying or contributing to a lowering of the soil mineraluzation properties.

[EL NINO77]

If this is a better detection when sweeping the coil up above the ground on very deep Equinox signals, this allows for a low recovery speed of 2-3 .... on low and medium mineralized terrains. ,,,....but in very strong mineralization when you have to use recovery speed 6-7 it will not help ....- there Equinox likes low sweeping coil over terrain ......

For example, from my observation with detector  Fisher Gold-Bug2 or Deeptech Vista Gold Gain on strong terrain mineralization ... it will actually help improve detection .. when you sweep the coil up 5-7cm above the terrain of heavily mineralized terrain ..

Speaking of testing....so for testing I use a low to medium mineralized test field..with a very deep storage subject at depths from 4 "to 15" .. Next I use 2 outdoor test boxes 350 liter "Liapor" box 4bar Fe3O4 = 0.4% magnetite ... and 60 liters ´ "BlackSand" Box 7 bar Fe3O4 = 4% magnetite ..
  Finally, to quickly check and compare the ability of detectors and coils to handle mineralization using 3 compact test BlackSand boxes with extremely strong mineralization of 4.4%, 12% and 33% Magnetite content ....

 

350 liter -4 Bar Fe3O4 "Liapor"= 0.4% Magnetite ..test box 

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My test field.. low and moderate mineralized terain..

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For comparison 4.4% Magnetit  mineralization = equal to 7bar Fe3O4 of very strong iron mineralization as measured by the Teknetics G2 detector.

Old 40 liter Black Sand box= 7Bar Fe3o4.. =4.4% Magnetite mineralization..

 

3 kilograms  pure Magnetit... in new  60 liter Black sand box..=7bar Fe3o4 mineralization..

Equinox 800, Vista Gold Gain 30khz.... and   Teknetics G2  testing ..im Black Sand../standart coils/

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Tesoro Mojave  testing 7" CC concentric coil contra 6x8 " Sef DD coil  in 4Bar Liapor  test box...

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Testing Compact Black sand boxes 12% and 33% Magnetite..

Interestingly, this compact 33% Black sand box / = 7.6kg black sand / ... contains 2.6 kg of Magnetite !!!

Thus, testing on the other two Test Boxes of 12% and 33% revealed all good and bad detector setup or coil properties.