Xtrem Hunter

[Skippy]

Maybe it should be CM?
Perhaps it is 95mm , square. That is 95mm x 95mm , maybe a flat plate.

[ivconic]

Obviously it is 10cmx10cm.

[moodz]

The translation says it's 10mmx10mm ... Objects cross section. Like a piece of cable or rebar iron. They made the detector to detect BO buried objects on building sites etc ...cables pipes. They never tested it on a plate type object only long skinny things. If it can resolve a piece of cable with a 10x10 mm cross section at 3.5 metres then that is still very good. I would say it would be even better on planar objects.

there is always the possibility they cheated and formed the target cables into loops ...which would be easy to detect at 3.5 metres but there is some substantial mathematics in the paper that does not indicate they cheated.

Moodz

[Altra]

As I understand your description the graph is for probability of discrimination 10% to 25%. That means it can probably detect a target deeper than the graph is indicating. I still question 10mm x10mm. I have a 10mm x 10mm beer can square and a gpx4500 can pick it up at about 100mm. Anyway hope you can make a practical circuit based the paper.

[Riss]

The constructor of this device claims that this Russian Pi detector is an older military model detector with the same good depth. I have not personally tested it, I just found this, so take a look.

https://metaldetector-fau.com/fau-pulse.htm#&panel1-1

This detector for the first time was demonstrated at one meeting in Bulgaria – in 2013 . Then i met with its manufacturer . The detector works very resistant to heavily polluted with iron junk terrains . Register well copper vessels. But reacts best to the mustache on his own manufacturer…
https://www.youtube.com/watch?v=M5esqC_Q9j8&t=0s
https://www.youtube.com/watch?v=K8Huo4_hOSo
https://www.facebook.com/faumetaldetector/videos/fau-pulse/1099557543551992/
https://www.facebook.com/faumetaldetector/videos/fau-pulse-%D1%82%D0%B5%D1%81%D1%82-%D1%81-%D1%87%D0%B5%D1%80%D0%B5%D0%BD-%D0%B8-%D1%86%D0%B2%D0%B5%D1%82%D0%B5%D0%BD-%D0%BC%D0%B5%D1%82%D0%B0%D0%BB-%D0%B7%D0%B0%D0%B5%D0%B4%D0%BD%D0%BE-/300459854233392/
https://www.facebook.com/faumetaldetector/videos/fau-pulse-%D1%82%D0%B5%D1%81%D1%82-%D1%81-%D0%B0%D0%BB%D1%83%D0%BC%D0%B8%D0%BD%D0%B8%D0%B5%D 0%B2%D0%BE-%D1%84%D0%BE%D0%BB%D0%B8%D0%BE/567395903709880/

[Riss]

.. so I am not sure if Russia has a patent system but they sure like putting out detailed technical papers on new technologies.

I found a 2021 paper from
Department of Mechatronics and Automation, South Ural State University, 454080 Chelyabinsk, Russia

Its a "new" type of sensing system that gives very deep detection with discrimination.

Here is a result from the paper .. The depth achieved is quite impressive at 3.5 meters with 25% chance of error. ( discrim and depth/size indication )

It would seem like a good candidate for hoard detection.

What is even more interesting is that I already have the electronics for this system. I will let you know some results shortly.

Yes - Russia has a patent system . I try to think logically : -This detector works in principle, completely different than that of ordinary ones metaldetectors
- Russians jealously guard their own inventions , so that the probability such a detector to leave the territory of of the Russian Federation is zero .
- Russians, like everyone else spread misinformation - it is not that they also have good sense of humor - the purpose is different…
- I speak Russian well , would you please provide any links for this miracle ?

[moodz]

Yes - Russia has a patent system . I try to think logically : -This detector works in principle, completely different than that of ordinary ones metaldetectors
- Russians jealously guard their own inventions , so that the probability such a detector to leave the territory of of the Russian Federation is zero .
- Russians, like everyone else spread misinformation - it is not that they also have good sense of humor - the purpose is different…
- I speak Russian well , would you please provide any links for this miracle ?

I dont think its a miracle ... its a variation on other works and not all the detail are in the document and I am reading alot extra between the lines.
However the implementation is quite neat ( if it works as presented ).

I found an english submission of the document. ( as i only had incomplete screenshots of the original )

See attached.

Moodz.

[ivconic]

Maybe this can be made as good hoard hunter: https://www.geotech1.com/forums/foru...r-star-hungary

[Riss]

Maybe this can be made as good hoard hunter: https://www.geotech1.com/forums/foru...r-star-hungary

Hopefully , but unlikely… primitive non-motion .

[Riss]

"Kite" (KORSHUN ) and MG1 - they have nothing in common…

[Riss]

There are many links for Korshun (Kite ) .The translation is good - I checked.
https://armiya.az/ru/news/186400/%D0...83%D0%BD%C2%BB
Tactical-Technical characteristics
Type of probing signal Radio pulses
Receiver type 2-channel (2nd and 3rd harmonics)
Output power (average / peak) 0.15 W / 200 W
The mine detector (metal detector) NR-900 EK "Kite" is in many ways a unique portable device designed to search for non-contact explosive devices. The product is able to detect explosives and devices hidden under various obstacles. Barriers can also be concrete and brick walls, barbed wire fences, metal meshes. The Kite mine detector detects explosives under asphalt and concrete road surfaces. The distance at which the mine detector confidently detects mines or explosive devices is 30 meters, the search speed is 40-50 times higher than, for example, conventional metal detectors.
The Korshun minesweeper is capable of detecting electronic devices, regardless of whether they are switched on or off. The time of transferring the device from the transport state to the working state is only 10 minutes. The transmitter frequency at which the NR-900 EK "Korshun" metal detector works is 848 MHz. Output pulse power of the transmitter – 200W/ 30W, receiver sensitivity (by 2nd and 3rd harmonics) – 150 dB/W (-120 dBm). Signaling - light and sound. Taking into account the large battery charge (Ni-Cad battery with a voltage of 6V and a capacity of 7 A/h, current consumption - no more than 500 mA), the device can work continuously in field conditions for a long time (at least 8 hours) without replacing the power source.

The small weight of the device (5.1 kilograms in the working position) provides comfortable working conditions, the whole set in a portable bag weighs 13 kilograms. The antenna block weighs 900 grams, the operating temperature range varies from minus 30 oC to plus 50 oC.
Appointment:
Detection of mines and explosive devices equipped with electronic fuses (initiation systems) installed on the surface of the ground, in the ground (snow), under covered roads and on objects.
The device allows you to detect:
Radio transmission and radio reception devices, communication systems, signaling and remote control of various objects.
Electronic and electromechanical timers.
Acoustic, magnetic, optoelectronic sensors and small television cameras.
Hidden metal structures, mechanisms and devices.
Household electronic devices and ski equipment in snowdrifts.

[moodz]

TThanks Riss .. The Korshun seems to be a non-linear junction detector.
It works by illuminating the target are with RF and causing anything with a non linear junction ( eg electronics with diodes / transistors / chips etc ) to cause harmonics of the fundamental which are detected.
This is not a new idea .. it is the principle of many bug detectors in espionage work and there is a well known case of the american embassy in moscow that contained more bugs than bricks and had to be torn down.

However this is not good for hoard detection ... although some metal oxides ( eg copper oxide ) is a non linear conductor and AFAIK the romans did not have transistor radios.

moodz.

[Eddy71]

The constructor of this device claims that this Russian Pi detector is an older military model detector with the same good depth. I have not personally tested it, I just found this, so take a look.

https://metaldetector-fau.com/fau-pulse.htm#&panel1-1

https://metaldetector-fau.com/locator.htm

Innovative solutions in the technique of searching for metal objects. Probably

[Skippy]

Moodz is correct, that tech description is a classic NLJD. In addition to the detector and a digging tool, you also need protective clothing, like a lead shield on your 'private parts' , and a lead helmet if you want to avoid losing your eyesight.
On the subject of harmonics : there is one two-box project out there ( 1980's magazine ? ) that has an RX circuit that measures the 3rd harmonic, not the fundamental. Does anyone have any insight into what problem this solves, and whether it has any merit today?

[Skippy]

Quote Eddy: "h t t p s://metaldetector-fau.com/locator.htm Innovative solutions in the technique of searching for metal objects" Having telescopic antennas that also stretch is quite innovative. Must be made of silver nano-wires, or some newly discovered alloy.