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Ferrous Limits Manticore

Why is discrimination the enemy of the Seeker? I will try to explain it using the top model of the Minelab Manticore detector. Why choose the most expensive equipment possible that most of us cannot afford? There are a few reasons. First of all, this detector has great imaging and you can easily understand everything by looking at the screen. Moreover, masked targets are very easy to spot if something is lying close to the iron.

Apart from discrimination, we can set the so-called iron limits and Ferrous limits. What does it do? The iron scale is wide in this detector, which cannot be said about other devices. What does it do? It is easy to distinguish and separate large and fine iron from each other.

What’s the point of all this? For a simple reason, big irons are often very interesting. A horseshoe, a sword, a cannonball, a bayonet can be the find of the day, and a well-identified bottle cap can save you time.

Ok, let’s start with the basics.

The upper gray bar is the set range of iron – the fine one. In this case, we have an iron nail. The bottom bar is for larger items. The axis in the middle is the conductivity axis from left to right from ID values 1 to 99.

For example, a thin silver coin will be in the middle on the left, but it may also fall… depending on the conditions there…

To be sure, we rotate each target 90 degrees and check how the drawing of the object has changed… this is a really big hint!

Here is the same nail after turning 90 degrees. Why is this happening? Often, iron, especially when rusty and having various complex shapes, distorts its color. In the case of forged nails, it may be their heads or the bend itself. The round and hollow shapes of the target are a story for another article.

The image above shows EMI interference. Just detune the detector or lower the sensitivity.

Here the nail or steel screw can be seen to be on the verge of the upper limit range. What do we do to check? We focus on the goal. Then the object will disappear or completely fall into the upper zone of the range.

A silver-struck coin with a range at the bottom of the ID scale. Low conductor, petty and miserable medieval silver. Please note this type of target may fall into the low end of the iron limit under certain conditions.

Przykład monety maskowanej przez mocno zmineralizowany grunt.

Here’s a coin next to a nail. You can see the signal of an iron object trying to cover the coin’s signature.

Finally, how not to set limits. A textbook example of how not to do it is below. This is an error that closes the device’s potential and does not allow separately masked objects. The detector becomes blind if the coin is next to the iron and there is no chance of separating and identifying it. This setting improves work comfort and silences the device… but only apparently. Moving too close to the axis seems like an ideal solution, but it is not! We have the Silencer option, which also needs to be used carefully.

So how do you set both limits? Under the conditions prevailing in a given place and the lowest – in the sense of the smallest value away from the conductivity axis. If the manufacturer sets the upper limit to 9, try starting with a value of 7 or lower. In my case, the limit is 4 even in difficult conditions. This arrangement places a greater workload on the operator, but also drastically improves the device’s performance.

There is no silver bullet here. You have to exercise until it hurts. Finally, there is the All Metal mode and the complete opening of iron and discrimination limits to check the given object.

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Minelab Manticore and Multi IQ+ technology

The first outing with Minelab Manticore was not successful. I had considerable doubts. After all, the price is about 10 thousand. PLN does its job and we have above-average expectations. The detector frighteningly distorted the color and no change and raising the iron limits (FERROUS LIMITS), or lowering the sensitivity and ground calibration did anything. I was stuck. I tried various ways to deal with the change in reactivity and frequent detuning, but it did not bring the expected results. The device was unstable and it was difficult to figure out what was the correct signal from the target, and what was ground interference and color-distorting iron.

Yes, the place is very difficult, and not because of the soil, which is easy and sandy, but because of the amount of iron in it. Minelab Manticore requires a bit more knowledge and experience from the user than devices from the lower price range. Here you have to think hard about what program we will choose for the prevailing conditions and how we will set it. In my case, I decided to change the program from a FAST setting to LOW CONDUCTORS. So low guides. Why? Old and fine silver has a very low ID and is located right next to iron.

The next step was to determine the iron ranges (FERROUS LIMITS), here the matter is not so simple. Low value more color distortion but less masking. I decided to set the upper value for fine iron – such as nails – to 6. This is slightly less than factory 7. The extreme version is 4, but I do not recommend it at the beginning, maybe when you get used to the equipment. It gives amazing results.

Recovery speed is a parameter responsible for the separation. Here I stayed with factory 5, and sometimes I use 6 in a place with more traffic 😉 Higher value, better separation of objects and more stability, less range. At low values, you have to sweep slower and the equipment becomes less stable. Fortunately, we can influence this with the speed of the sweep. When we come across a garbage can – we slow down, and when it’s clean we can easily speed up. Patience and experience, humility, and there will be results!

It remains to set the sensitivity. The principle is always the same as in other detectors. We go up and watch how the detector behaves. Unstable work, we have to go down. Along the way, we do NOISE CANCEL, i.e. scanning channels to look for the best one. We can combine this with the sensitivity adjustment and choose the right setting. It is worth holding the interference reset button longer until you get one repeatable channel after each scan. In the case of Manitcor, the algorithm analyzes the interference and selects the best channel for the given operating frequencies selected with the program.

Audio. What audio to choose in a place where iron and its natural oxidation make even shallow objects practically inaudible?! I chose the ENHANCED option with noise reduction and it was a hit. Finally, the number of tones. It has been known for a long time that simple audio is the best in a dump or among the iron. One ton fell. Modulation? I chose SIMPLE, which is the smallest difference between a strong and a weak signal. Why? A large value for the MEDIUM or RICH parameter makes it easy to get lost with a large number of different signals, especially high tones from piercing iron. We want to check every signal and not miss anything!

Ground calibration remained at 0, although tracking did not introduce significant changes. The maximum corrected value is 2. The device cannot be manually adjusted by the pumping process here – too much iron!

Let’s go back to the results obtained, and this one completely knocked me off my feet! The spot I passed through revived and began to produce signals that were previously inaudible to other devices, and I spent almost two years in this place! It’s a strange feeling to pull stuff next to your pits and footprints … MultiIQ+ software Minelab does the job in combination with very fast hardware. The sensation is shocking when the detector separates the masked signals with the iron and the 2D graph becomes a checking tool. How to do it? The matter is simple because it is very easy to distinguish interference from iron and ground in the ENHANCED audio. In case of additional doubts, we look at the chart and rotate over the target by 90 degrees. In this case, after rotation, the TARGET TRACE signal in the conductivity axis, signaling the so-called color returns to iron. The chart gives us amazing opportunities to check the signal. For example, it shows large iron objects masking low conductors, small iron showing color, but also a pair of different objects next to each other. The dominant of the stronger signal changes with the change of position over the object. It’s just brilliant! If we add interference, mineralization, and different types of conductivity, we have a full picture of the possibilities!

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Finally, is the detector worth 10,000? zloty? Certainly not in this country. We simply cannot afford it and no matter how good the ratio of our earnings to price is, it is unacceptable. Too bad no one talks about it!

Judge for yourself and remember to comment on this article and on our social media.