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Deus 2 = 49 Frequencies?


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On 11/21/2021 at 12:51 PM, Steve Herschbach said:

Minelab gets a bad rap at times over their marketing practices. But everyone does it. Take the Deus 2 claim of being able to choose between 49 frequencies (see upper right in picture below - click or double click for larger version). The reality I am willing to bet a dime on, is that it is actually a choice between 7 frequencies. 4 kHz, 7 kHz, 15 kHz, 21 kHz, 28 kHz, 35 kHz, and 45 kHz. The other 42 frequencies are almost certainly just the tiny offsets included for EMI canceling purposes, 6 offsets for each of the 7 primary frequencies. They did the same thing with the original Deus, counting these small offsets as separate frequencies for marketing purposes (X35 coils for 35 frequencies).

Anyway, I'm not posting this as a criticism per se, since again, everyone does this stuff. Just for newbies or people unfamiliar with multifrequency detectors, don't think this will give you a true 49 frequency range to choose from. 4 to 45 in single frequency steps would not even add up to that many, and frankly, that would be too much for no real purpose. Frequency differences only matter if there is enough spread. The difference between 10 kHz and 11 kHz would be perceptible to nobody. From a control perspective even, it would be silly to scroll through 49 frequencies, and you will not. The Deus 2 will let you choose from 7 single frequencies, and the others will only happen in a separate Frequency Shift menu, three positive, and three negative offsets. So 14.7, 14.8, 14.9, 15 kHz, 15.1, 15.2, 15.3 for the 15 kHz setting. That's seven versions of 15 kHz, do the same with the other 6 primary frequencies, and bingo, you get 49 frequencies. But not really - it's seven folks.

Also, just like Equinox with it's six frequencies, don't think all seven frequencies are going to be running at once in the multi modes. People assume that, and then get angry when they find out different. But it will never be stated explicitly by XP that this is what is going on, because it is not. Generally all you need is three frequencies for an optimum solution, and adding more takes more processing power while adding nothing real as far as capability. All that matters is the mix you use depending on the goal. Gold prospecting will be "weighted" to high frequency, silver coins will be "weighted" to lower frequencies. No matter what, we still do not have one multi mode that does everything. Saltwater modes must ignore signals you really want while gold prospecting, otherwise you detect the salt.

I repeat, I'm not trying to ding XP with this post. Just saying that with Deus 2 you will get a machine with several multi modes customized for several situations, none of which are using all seven frequencies - certainly not 49!!. And you will have the option of choosing between seven different single frequencies. Know the realities of the tech, and be realistic to avoid disappointment.

I have to admit I really like what I see with the Deus 2. If I had to pick one VLF to buy right now, this would be it.

xp-deus-2-49-frequencies.jpg

In fact, if you do a deep dive on the Deus II mode descriptions, XP is pretty up front about the frequency ranges EXCLUDED in a given SMF profile.   For example, note the “Max freq.” specified in these 3 Deus II mode descriptions:

  1. FAST: FMF • Max. freq. 40khz • Frequency addition. FAST is based on the same platform as Prg. 2 - SENSITIVE, but the audio is set to Pitch mode with Reactivity at 3 instead of 2.5 and uses the square audio feature. These three settings combined allow the machine to work fast in ferrous-polluted and mineralized ground.
  2. PARK: FMF • Max. freq. 24khz • Frequency addition. PARK is adjusted for searching recreational area’s such as, parks, dry sand beach, etc., sites that are normally polluted.
  3. DEEP HC: FMF • Max. freq. 14khz • Frequency addition. DEEP HIGH CONDUCTOR adds together very low and medium frequencies up to 14 kHz. Designed to better locate good conductivity targets, it is ideal for clusters of coins whilst maintaining excellent sensitivity to isolated coins using its 14 kHz frequency.

Note further, that XP mentions “frequency addition” and in some of the other mode descriptions not copied here XP mentions “frequency subtraction” and also “conductive ground subtraction” - so apparently some sophisticated SMF frequency weighting and signal processing going on with Deus II.  Also, to add on to what Steve was saying above regarding limiting the actual number of discretely transmitted frequencies, besides signal processing load, the more discrete frequencies you transmit simultaneously means you have to divvy up your finite transmit power amongst all those simultaneous waveforms limiting the strength of the magnetic field that is induced in the target and as a result the target signal strength is reduced which limits depth and the ability to discern the weak target return signal from the noise floor.

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Makes sense. High frequencies recover faster than low frequencies, so a fast mode using higher frequencies fits the bill. And in general, lower frequencies ignore ground better, giving better depth on large and/or high conductive targets, so shifting lower for parks (coins), and lower yet for larger targets, all fits into the general "weighting" schemes that we see Minelab using in Equinox. No doubt a similar pattern will emerge with the Legend.

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On 11/21/2021 at 3:51 PM, Steve Herschbach said:

Minelab gets a bad rap at times over their marketing practices. But everyone does it. Take the Deus 2 claim of being able to choose between 49 frequencies (see upper right in picture below - click or double click for larger version). The reality I am willing to bet a dime on, is that it is actually a choice between 7 frequencies. 4 kHz, 7 kHz, 15 kHz, 21 kHz, 28 kHz, 35 kHz, and 45 kHz. The other 42 frequencies are almost certainly just the tiny offsets included for EMI canceling purposes, 6 offsets for each of the 7 primary frequencies. They did the same thing with the original Deus, counting these small offsets as separate frequencies for marketing purposes (X35 coils for 35 frequencies).

Anyway, I'm not posting this as a criticism per se, since again, everyone does this stuff. Just for newbies or people unfamiliar with multifrequency detectors, don't think this will give you a true 49 frequency range to choose from. 4 to 45 in single frequency steps would not even add up to that many, and frankly, that would be too much for no real purpose. Frequency differences only matter if there is enough spread. The difference between 10 kHz and 11 kHz would be perceptible to nobody. From a control perspective even, it would be silly to scroll through 49 frequencies, and you will not. The Deus 2 will let you choose from 7 single frequencies, and the others will only happen in a separate Frequency Shift menu, three positive, and three negative offsets. So 14.7, 14.8, 14.9, 15 kHz, 15.1, 15.2, 15.3 for the 15 kHz setting. That's seven versions of 15 kHz, do the same with the other 6 primary frequencies, and bingo, you get 49 frequencies. But not really - it's seven folks.

 

xp-deus-2-49-frequencies.jpg

Definitely not questioning the accuracy of this post. I have no clue what the Deus 2 frequency offsets will be. However, except for one, all of the Deus 1 frequency offsets are much wider than .1 kHz each.

X 35 coil frequency ranges are:  3.7 to 4.4, 7.1 to 8.4, 10.5 to 12.4, 15.2 to 17.8 and 23.5 to 27.7 kHz.

HF 9” coil frequency ranges are:  13 to 15.7, 26 to 31, and 50 to 59 kHz.

HF 9.5” elliptical coil frequency ranges are:  13 to 15.7, 26 to 31, and 68 to 81 kHz.

                                  

 

 

 

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I’m sure I’m guessing the exact offsets wrong, but the idea is still the same. A set of base frequencies, modified via the Frequency Shift menu selection, in less than 1 kHz increments.

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