Lrl from Italy

[brain]

Originally Posted by FrancoItaly

yes, it could be mine, but i can't log into instagram.

https://www.youtube.com/watch?v=JmMslqogxio

https://www.youtube.com/watch?v=OplRVuU5bds

https://www.youtube.com/watch?v=cMBvxexIF4s

[FrancoItaly]

Originally Posted by brain

https://www.youtube.com/watch?v=JmMslqogxio

https://www.youtube.com/watch?v=OplRVuU5bds

https://www.youtube.com/watch?v=cMBvxexIF4s

Yes, it looks like mine, at least externally.

[brain]

Originally Posted by FrancoItaly

Yes, it looks like mine, at least externally.

franco can you take a look at this.this is used

https://www.minicircuits.com/pdfs/ERA-3SM+.pdf

[FrancoItaly]

Originally Posted by brain

franco can you take a look at this.this is used

https://www.minicircuits.com/pdfs/ERA-3SM+.pdf

It's interesting, but I'm not sure it can be used for the sensor stage, as the mixer and the total gain are important. However you can do tests.

[brain]

Originally Posted by FrancoItaly

It's interesting, but I'm not sure it can be used for the sensor stage, as the mixer and the total gain are important. However you can do tests.

fm transmitter + era-3sm+opamp lm 358 these are the ones I see. as picture.

[liudengyuand]

What is your maximum depth

[brain]

Originally Posted by Babak51

This design and circuit of Mr. Franco, which has been slightly strengthened by our good friends, and of course it is much better to increase the distance of the sensor from the discipline. However, it is very powerful and sensitive.

Is it possible to send PCB of this?

[brain]

hello, have you tried the franco telescopic antenna with a copper or other metal antenna?

[brain]

Franco TR1 Emitter The 8 MHz oscilloscope screen is to be what value.

[FrancoItaly]

Originally Posted by brain

Franco TR1 Emitter The 8 MHz oscilloscope screen is to be what value.

The value is not critical, it is in the 1/3 V peak to peak range. Varying C2 / C3 / C4 you get the right voltage value at the sensor stage output. You could also put a semi-fixed potentiometer in place of R3 for easier adjustment.

[brain]

Tr1 Emitter Image Pictured.
https://imgyukle.com/i/0bS4U


I added a 30/40pf capacitor to the Tr4 collector. This is how I solved it.

[FrancoItaly]

I do not understand what happened, I put the post back

The value is not critical, it is in the 1/3 V peak to peak range. Varying C2 / C3 / C4 you get the right voltage value at the sensor stage output. You could also put a semi-fixed potentiometer in place of R3 for easier adjustment.

[brain]

Originally Posted by FrancoItaly

I do not understand what happened, I put the post back

The value is not critical, it is in the 1/3 V peak to peak range. Varying C2 / C3 / C4 you get the right voltage value at the sensor stage output. You could also put a semi-fixed potentiometer in place of R3 for easier adjustment.

do you look at the picture


https://imgyukle.com/i/0441q

[FrancoItaly]

Originally Posted by brain

do you look at the picture


https://imgyukle.com/i/0441q

I don't understand what the 30 / 40pf capacitor to the Tr4 collector is for.

[brain]

Originally Posted by FrancoItaly

Tr4 toplayıcıya 30 / 40pf kondansat?r?n ne işe yaradığını anlamıyorum.

Add See. Notice that the droops are from here.

[Locator]

Hello Franco,


i read your theme and i notice that you have alot of patience in your answers,bravo!
As about "phenomenon"(Greek word)i think that gold,silver and copper(but mainly gold and silver)when they are placed(burried)for years in the ground(due to their electrochemical reaction with the soil)become something like antennas with the result that when a radio signal hits them it increases(the signal)and we can catch this increase with any LRL...your's or Mineoro e.t.c.


My regards:


Christos

[FrancoItaly]

Originally Posted by Locator

Hello Franco,


i read your theme and i notice that you have alot of patience in your answers,bravo!
As about "phenomenon"(Greek word)i think that gold,silver and copper(but mainly gold and silver)when they are placed(burried)for years in the ground(due to their electrochemical reaction with the soil)become something like antennas with the result that when a radio signal hits them it increases(the signal)and we can catch this increase with any LRL...your's or Mineoro e.t.c.


My regards:


Christos

I think your theory is correct but incomplete, as the magnetic field also comes into play in the phenomenon due to the different orientation sensitivity.

[brain]

Is the phenomenon always positive? Or is it negative?


I have detected 2 locations with your sensor. Both are positive, but the iron phenomenon is also effective. Do you have any ideas for this?

[FrancoItaly]

Originally Posted by brain

Is the phenomenon always positive? Or is it negative?


I have detected 2 locations with your sensor. Both are positive, but the iron phenomenon is also effective. Do you have any ideas for this?

In my experience the phenomenon is always positive and my various lrls are insensitive to iron, a fact confirmed by other members of the forum, however other members (Geo for example) affirm that instead the lrl is also sensitive to iron. Probably some types of ground can be the cause of this.

[brain]

Originally Posted by FrancoItaly

In my experience the phenomenon is always positive and my various lrls are insensitive to iron, a fact confirmed by other members of the forum, however other members (Geo for example) affirm that instead the lrl is also sensitive to iron. Probably some types of ground can be the cause of this.

What do I need to do to prevent the iron, can you share some information about it?

[Locator]

Originally Posted by FrancoItaly

I think your theory is correct but incomplete, as the magnetic field also comes into play in the phenomenon due to the different orientation sensitivity.

Yes,because earth's magnetic lines moves from south to north.

[shahrayar]

If the device is strongly sensitive to iron and the Earth's magnetic field, it is not suitable for detecting gold
More modification is required

[FrancoItaly]

Originally Posted by shahrayar

If the device is strongly sensitive to iron and the Earth's magnetic field, it is not suitable for detecting gold
More modification is required

All the lrls are directional, the maximum sensitivity is from north to south, as I said as far as I am concerned, my lrl, tested in Switzerland and in Italy, is insensitive to iron. However in any case it is necessary to use an MD for the final phase, that is, to establish the exact point.

[brain]

Originally Posted by FrancoItaly

All the lrls are directional, the maximum sensitivity is from north to south, as I said as far as I am concerned, my lrl, tested in Switzerland and in Italy, is insensitive to iron. However in any case it is necessary to use an MD for the final phase, that is, to establish the exact point.

How did you block iron?

[FrancoItaly]

Originally Posted by brain

How did you block iron?

In my experience my lrl (but I think the others too) is insensitive to iron, without having to make any changes. If it happens in some type of ground, I don't know what modification to make. I want to add that in the places where I did tests there was a lot of iron, even partially buried stakes and there was no reaction to the iron.