Lrl from Italy

[FrancoItaly]

Originally Posted by abdou2014

the pot threshold does not react to my hand, my hand near or far is the same thing for the LED,
the LED light only when my hand is near to the telescopic antenna , how inverted and make the led turn off instead of it turns on near the antenna ???

As I said before, touching the antenna is a way to empirically establish if the sensor stage is properly tuned. Normally the signal decreases but it may happen that instead the signal increases, so it is not a malfunction of the lrl.

[FrancoItaly]

Originally Posted by abdou2014

I'm going to change the pcb, the old one was perfect, I found a misterious method to suppress the sky effect

I'm curious to know how your system works. It may be possible to increase sensitivity and perhaps even have some discrimination.

[Dubulumach]

Hello FrancoItaly

Your LRLs work but suffer from so called "Albedo problem". What is it ?
When you enter in range of Halo-effect field with telesopic antenna you have already disturbed the field. Your antenna need extreme loosy coupling with ambient, to be at maximum sensitivityy not disturbing the field. Use capacitive coupling between two very small capacitors or two very small inductors at the end of your antenna. Also good high impendance RC filter is needed to reject iron targets or selective LC filters, each tuned for specific color metal.

Best Regards
Dubulumach.

[FrancoItaly]

Originally Posted by Dubulumach

Hello FrancoItaly

Your LRLs work but suffer from so called "Albedo problem". What is it ?
When you enter in range of Halo-effect field with telesopic antenna you have already disturbed the field. Your antenna need extreme loosy coupling with ambient, to be at maximum sensitivityy not disturbing the field. Use capacitive coupling between two very small capacitors or two very small inductors at the end of your antenna. Also good high impendance RC filter is needed to reject iron targets or selective LC filters, each tuned for specific color metal.

Best Regards
Dubulumach.

Hi Dubulumach,
I have experience only on land in Italy and Switzerland (near Italy), also a member of the forum that lives in central america confirms the same thing, that is my lrl (but I think all the others) are insensitive to iron, I believe that iron does not emit the phenomenon. Certainly if the gain is too high the compass effect appears and also many other disturbances of which I do not know the origin. I can think of small metal fragments (non-ferrous) or radio transmitters whose fundamental frequency or harmonic (lower or upper) falls within the range of L1 / C10.
As a general rule if the disturbance remains constant while walking it is the compass effect or some electromagnetic disturbance, while if it disappears after a few meters it is almost certainly a small piece of metal that maybe the MD can not reveal:

Best Regards

[Dubulumach]

Hy FrancoItaly

Why don't you try frontend preamplifier for example from Mineoro DC210 which Geo has discloded.? Or use RF sniffer from DCH85 with TDA7000 tunnd at 110-120Mhz ?

Any horizont effect (sky/ground) make lrl prospecting impossible, right ?

Best Regards
Dubulumach

[abdou2014]

I made this modification franco lrl with tda7000, it did not work, I found two ways to eliminate the effect of the sky, but I have not yet tried in the test field, but a great sensitivity and discrimination for different fields

[Dubulumach]

Originally Posted by abdou2014

I made this modification franco lrl with tda7000, it did not work, I found two ways to eliminate the effect of the sky, but I have not yet tried in the test field, but a great sensitivity and discrimination for different fields

analyse this. you need to inject very weak signal (uV) from Franco's oscillator via 0.33pf or less at base of BF494 transistor.

BFO

[abdou2014]

did you build this modification, make us a schema, for me, I connected the output of the TDA to the TR2 mixer .

[Dubulumach]

Originally Posted by abdou2014

did you build this modification, make us a schema, for me, I connected the output of the TDA to the TR2 mixer .

No.
Output of TDA7000 is weak audio signal. in fact noise. tune rf sniffer away from any FM station foe example 118-120Mhz.

[abdou2014]

other picturs noT open ???

[Dubulumach]

http://dodaj.rs/images/dTimv.jpg

[abdou2014]

what's Pre amp reference ?

[Dubulumach]

USE BEST NF PREAMP YOU CAN FIND ON INTERNET.

SEARCH AND READ. NOT WAIT SOMEBODY DO JOB FOR YOU.

[abdou2014]

I just want see your ideas and your progress , I do not intend to make it , I have two LRLs that works wonderfully

[Dubulumach]

I dont show my ideas and dont sell nobody. Thats only for me. Nor one will gift you working LRL schematic for free. Thats the fact.
Don't ask, but make yourself.

[FrancoItaly]

I believe that little can be done to increase sensitivity. We have seen that increasing the gain at some point appears the compass effect. Perhaps you can act by varying the frequency of L1 / C10 and checking if there is a point where you can further increase the gain before the compass effect appears.

[abdou2014]

you mean that the sky effect has a bandwidth, we can also remove the sky effect and vary LC to receive the phenomenon .

[FrancoItaly]

Originally Posted by abdou2014

you mean that the sky effect has a bandwidth, we can also remove the sky effect and vary LC to receive the phenomenon .

It's possible, but I have not tried.

[abdou2014]

tomorrow I'm going to the test field to experiment
you will have the results, thank you Mr Franco.

[abdou2014]

Franco LRL contains two different type of sensor, i think it's the best

[abdou2014]

it can be used at the same time with different sensors : EM . IR . RF. SC. UV. PL .......

[abdou2014]

VU DISPLAY

[HaFar2010]

HelloDear Franco.
I have a question about it, some people believe that your LRL (like Mole PROSPECTOR) will turn off if we are exactly on target. Do you think it's true?

[humhum]

Originally Posted by HaFar2010

HelloDear Franco.
I have a question about it, some people believe that your LRL (like Mole PROSPECTOR) will turn off if we are exactly on target. Do you think it's true?

So like My Homemade Mineoro LRL, I have test with my LRL ,if Treasure is Big ,
and when I am on it (center of Treasure or around) Nothing Beep my Device. (as Esteban said). This is Real ,But LRL of Francoitaly is not Ionic Receiver , reaction may be different.

[HaFar2010]

Is your LRL base on chamber Mechanism?