How to construct a Test area for LRLs

[Geo]

Couldn't agree more. They can not detect metals.
They can only detect something called electromagnetic fields and what produces them, which is Transmission Antennas

You know for sure that metal detectors are coursed by presence of nearby electromagnetic fields, emmited by power lines, flyback monitors, high efficiency lamps.

How does a LRL prevent the radio signals from overpowering the faint signals of the "certain conditions" due to presence of metals?

I just decided to get more informed about the LRL's. I consider wikipedia a pretty good source of information.

Here is a good presentation of LRL: http://en.wikipedia.org/wiki/Long_range_locator

Regards,
Nicolae

Hi.
I have not the ability to explain how LRL is working !!!!
I say what i have see all these years.
Example...... I have a coin 10cm in the ground, and with a metal detector i locate it. Normal condition....
I remove the coin from the earth and the MD don't detect it... again normal condition. I made the same with a electronic LRL at 2 gold coins. LRL located them. I remove the one coin and i buried it after 2 meters. LRL detected a line from one coin to other..... (not normal condition..), i removed the coins and for 5... 10 minutes LRL detected the same line (from coin to coin).... (not normal condition). I saw it, and i don't know why... or "about why". So (sorry for it), you can't tell me anything about it!!!! Also i don't Know if Esteban saw similar "phenomenon"

Regards

[nick_f]

Hi.
I have not the ability to explain how LRL is working !!!!
I say what i have see all these years.
Example...... I have a coin 10cm in the ground, and with a metal detector i locate it. Normal condition....
I remove the coin from the earth and the MD don't detect it... again normal condition. I made the same with a electronic LRL at 2 gold coins. LRL located them. I remove the one coin and i buried it after 2 meters. LRL detected a line from one coin to other..... (not normal condition..), i removed the coins and for 5... 10 minutes LRL detected the same line (from coin to coin).... (not normal condition). I saw it, and i don't know why... or "about why". So (sorry for it), you can't tell me anything about it!!!! Also i don't Know if Esteban saw similar "phenomenon"

Regards

So, if you have two gold nuggets, 10 meters apart and you identify the line that links them, you will have to dig like 10 meters in order to find them. In some soils, that could take a whole week of hard work! What is the gold is at 5 meters under the ground? Would you ever dig that deep?
What if you have five gold nuggets in an area of 25 square meters, how will the LRL "tell" you where to search and how deep before you quit?

I suppose you were reading the "spectrums" of the gold coins after you removed them. Or, more likely, you were just getting some radio signal, like the people who do radio fox hunting.

Regards,
Nicolae

[Esteban]

Esteban, I had a look at your diagram. You have a rapid impulse (or pulse) amplifier in there. Does gold emit rapid pulses? When you brign some gold very close to a LRL, can you see the needle going high?
You are right with the capacitor at the output of the pulse amplifier. If you change its value, the needle indication will change. Because a capacitor acts like a shortcircuit for pulses. The larger the value, the less indication on the needle. The electrolytic capacitor is used to separate the DC between stages, and it is ok to stay there. The higher its capacitance, the lower the frequency that can go through.
I am not sure what's inside the equalizer. Is it like an audio equalizer, that amplifies more some frequencies than others? Or is it more like a signal compressor, it provides a pretty constant output for an input signal varying in large limits?
The diagram is not a complete nonsense, as I was expecting. It respects some electronic rules. But if you look deeper into it, you might have a few surprises. If you put a one diode detector followed by a pair of high impedance headphones at the output of the rapid impulse amplifier, you will be able to hear a lot of AM radio broadcast, all stations mixed together.
Conclusion: your device is some sort of a electrical field meter, but instead of finding gold, has more chance of finding transmission towers and radio broadcast stations Take your instrument into a Faraday cage, and the needle will go to zero... bring all the gold you've got into the cage, there won't be the slightest change in indication.

Thanks for sharing the circuit diagram with us.

Regards,
Nicolae

This not only detect gold and/or silver, also bronze, coins and cartridge type 7.62 and this last exhibit a big "field" or "phenomenon", I called. But this big "field" or "phenomenon" only is "testable" when the target is buried some years, called by others "halo"? Now, once, walking, I obtain a signal and was in lateral of the antenna, I saw a tree and in the base of it I put the antenna and don't stop the beeps. I found a stainless steel coin, common here. Once I obtain very short beeps and found a lead weight used for fishing. So, lead is a "cold" metal regarding the low level in "creation" of the "phenomenon".

Don't know if detect radio stations, but any device near a tower of radio is influenced by it. Also you can ear AM station in a common voltage regulator... In the input of my device exist as a kind of filter don't showed here.

[Esteban]

I use separate PCBs for to test different circuits. Audio beeper generator is appart also, and this don't suffer many mods., except the addition of high resistence in serie for to filtrate oxidated nails. The first time I detect in 2 opportunities nails in my patio and I discover that a high resistence in serie with the 100 pF stops detection of oxidated iron items, mainly nails, seems that sharp end of this produced a kind of charge scape and are more easily detectable. But I stop this.

Now, in the joint (via cable) of impulse capturer PCB and equalizer (regulation made between positive and negative of the power source, like a comparator) the detection also occurs with short beeps, this is down the machine. But in front part the beeps are very more insistent.

[Esteban]

Couldn't agree more. They can not detect metals.
They can only detect something called electromagnetic fields and what produces them, which is Transmission Antennas

You know for sure that metal detectors are coursed by presence of nearby electromagnetic fields, emmited by power lines, flyback monitors, high efficiency lamps.

How does a LRL prevent the radio signals from overpowering the faint signals of the "certain conditions" due to presence of metals?

I just decided to get more informed about the LRL's. I consider wikipedia a pretty good source of information.

Here is a good presentation of LRL: http://en.wikipedia.org/wiki/Long_range_locator

Regards,
Nicolae

Maybe must be re-write the wiki info...

[Theseus]

Maybe must be re-write the wiki info...

Until such time as you can (and want to) offer more details and proof of your claims and assertions; I think the Wiki info on Long Range Locators should stand just the way it is.

[Esteban]

Nicolae, do you're Romanian? I found Romanian electronics magazine with famous Nicolae Ceaucescu in front page, January 1979. You can download hundreds 1970 to 2005 magazine and suplements. There are some MD and other old info, soviet radio schematics, oscilloscopes, thousands circuits, etc.

http://blog.jointelecom.com/lang_enarhiva-electronica-revista-tehnium-1971-2001lang_en/

[Esteban]

Until such time as you can (and want to) offer more details and proof of your claims and assertions; I think the Wiki info on Long Range Locators should stand just the way it is.

Yes, in theory.

[Theseus]

Yes, in theory.

...and in practice!

[detectoman]

hi estaban thanks very much, for old magazines, here exist! great treasures one embrace

[Esteban]

...and in practice!

Yes, I make a ton!

[WM6]

Yes, I make a ton!

Esteban, with this statement, you just admitted that none of these phenomenal boxes did not work, because if they operated at least one, this would be enough and you would not need a whole ton of crappy boxes.

[Qiaozhi]

Esteban, with this statement, you just admitted that none of these phenomenal boxes did not work, because if they operated at least one, this would be enough and you would not need a whole ton of crappy boxes.

In Esteban's defense ... you must understand that this is his hobby. In which case he's always looking for improvements, in the same way that we look for advancements in conventional metal detector technology.

[Esteban]

In Esteban's defense ... you must understand that this is his hobby. In which case he's always looking for improvements, in the same way that we look for advancements in conventional metal detector technology.

Thanks, you understand the point!

Happy New Year for members of forums!

[Geo]

Happy New Year!!!!!
On new year i will see you my New LRL!!!!!
Hahaha.... i know.... LRL don't work.
Never mint.... we are a Family HERE!!!!!

Best Regards