Lrl from Italy

[FrancoItaly]

hello franco italy
I wish you health and happiness in the new year.
Please give a full explanation about this post yourself.
As we know, the complete matching and resonance of the input signal from the antenna with the oscillator signal can greatly help the performance of this circuit. How should we understand that this coordination between these two signals is established in the circuit?
You have made a small reference to this issue in this post. Please explain more and fully.
thank you

I'm sorry, but I don't remember that post. There are 2 20 MHz versions, the first with an extra transistor, the second similar to the original version, I said on the forum that I can't provide explanations because of the 3 examples built only one works correctly, so I couldn't help, given that not even I succeeded.
Regarding your request you just need to vary L/C until you get a point where the output increases and then decreases while continuing to vary L/C.

[erfan]

I'm sorry, but I don't remember that post. There are 2 20 MHz versions, the first with an extra transistor, the second similar to the original version, I said on the forum that I can't provide explanations because of the 3 examples built only one works correctly, so I couldn't help, given that not even I succeeded.
Regarding your request you just need to vary L/C until you get a point where the output increases and then decreases while continuing to vary L/C.

Thank you for your reply dear franco
Your post, which I quoted, is on page 104 of post number 2592.
Also, on page 102 of post #2535, you mentioned changing the L/C to match the 20 MHz harmonic oscillator.
What do you mean by this part that I have drawn in red?
There is only 1 coil, why did you say 2 coils? What do you mean by the second coil?

If my questions cause you pain and waste of time, I apologize. If you can guide me, good man

[FrancoItaly]

A few years have passed and I don't remember well, however there are 3 versions, the first, the original one at 8 MHz, the second at 20 MHz, with L/C tuned to a harmonic of 20 MHz, 80/100/120 MHz and the third with external oscillator and antenna, which oscillates on an L/C harmonic. However, the last 2 versions are very difficult to fine-tune and I don't feel like giving advice.

[erfan]

A few years have passed and I don't remember well, however there are 3 versions, the first, the original one at 8 MHz, the second at 20 MHz, with L/C tuned to a harmonic of 20 MHz, 80/100/120 MHz and the third with external oscillator and antenna, which oscillates on an L/C harmonic. However, the last 2 versions are very difficult to fine-tune and I don't feel like giving advice.

In these years that have passed since the beginning of this type, you have always answered everyone with generosity and magnanimity, and I always consider myself indebted to you.
I hope you will always be healthy and happy and God's hands will support you.
This type is a big leap in the history of LRLs in the last few decades. Without a doubt, the structure and nature of your LRL detection is the closest and most useful method for detecting buried precious metals. Without a doubt, I and anyone who can increase the distance in detection with LRL owes all this success to you.
May God always be with you great man

[FrancoItaly]

In these years that have passed since the beginning of this type, you have always answered everyone with generosity and magnanimity, and I always consider myself indebted to you.
I hope you will always be healthy and happy and God's hands will support you.
This type is a big leap in the history of LRLs in the last few decades. Without a doubt, the structure and nature of your LRL detection is the closest and most useful method for detecting buried precious metals. Without a doubt, I and anyone who can increase the distance in detection with LRL owes all this success to you.
May God always be with you great man

Thank you for the kind words, but there are other types of LRL, first of all that of Alonzo already in the 60s, mine is perhaps the simplest to build, there are no coils to wind and align and the antenna is very simple but the main advantage is that there are all the instructions to build it.

[sadaka]

salve

buon giorno franco sono marco da perugia sto leggendomi tutto il post dall'inizio sono arrivato qui in merito ad un presunto tesoro sepolto nei terreni che possiede mio padre, complimenti per la pazienza e la sagacia scusa se ti disturbo ho fatto gli studi professionali e credo di poterlo realizzare anche io solo che trovo svariati schemi e foto lungo il post nella penultima pagina ci sono quellli piu' aggiornati credo, posso basarmi su quelli? intendo gli schemi di un certo dream_man che tu hai postato, ho visto varie versioni tre se non sbaglio ma tu dici che solo una funziona ? quella a 8 megaerz? e lo schema di dream_man e di quella versione? scusa le tante domande ma preferisco essere sicuro e non fartene altre fino alla realizzazione grazie infinite marco.

[FrancoItaly]

buon giorno franco sono marco da perugia sto leggendomi tutto il post dall'inizio sono arrivato qui in merito ad un presunto tesoro sepolto nei terreni che possiede mio padre, complimenti per la pazienza e la sagacia scusa se ti disturbo ho fatto gli studi professionali e credo di poterlo realizzare anche io solo che trovo svariati schemi e foto lungo il post nella penultima pagina ci sono quellli piu' aggiornati credo, posso basarmi su quelli? intendo gli schemi di un certo dream_man che tu hai postato, ho visto varie versioni tre se non sbaglio ma tu dici che solo una funziona ? quella a 8 megaerz? e lo schema di dream_man e di quella versione? scusa le tante domande ma preferisco essere sicuro e non fartene altre fino alla realizzazione grazie infinite marco.

Qui ? obbligatorio l'uso dell'inglese, ti rispondo con un messaggio privato.

[abdou2014]

Hello dear friend Franco, I have a problem with my LRL, when I reduce the sensitivity to remove the compass effect, and I start going up the mountain the compass effect will reappear , or I'm behind a hill and I go out into open air it will reappear ,
I'm sure it's a satellite I'm receiving, have you had this experience ? What did you do to avoid this reception, increase the frequency ?

Regards !

[FrancoItaly]

Hello dear friend Franco, I have a problem with my LRL, when I reduce the sensitivity to remove the compass effect, and I start going up the mountain the compass effect will reappear , or I'm behind a hill and I go out into open air it will reappear ,
I'm sure it's a satellite I'm receiving, have you had this experience ? What did you do to avoid this reception, increase the frequency ?

Regards !

The only explanation I can think of is that the compass effect probably doesn't have the same intensity everywhere, a bit like the ground effect for MDs. As for changing the frequency, I haven't tried it, but I haven't experimented with it for several years now.

[Rahman]

FrancoItaly

Hi Franco, my friend, should the selfie be horizontal or vertical, and the shield should be from inside the box

[FrancoItaly]

Hi Franco, my friend, should the selfie be horizontal or vertical, and the shield should be from inside the box

The shielding is not critical, the important thing is good electrical contact with the PCB ground and also the shielding of the handle.

[FrancoItaly]

I'm posting the material for building my lrl for a new forum member.

[seyyah33]

pcb

Complete pcb with antenna amplifier
You can assemble one coil or two coils
I assembled, Sense is better

Hello Mr. Arash, I managed to create the attached PCB and made it work, but I have difficulty in calibration. 5k pot, 20k and 500k, how should I adjust it, I would be grateful if you could help me, thank you in advance

[Kamal]

I'm posting the material for building my lrl for a new forum member.

Hello Mr. Franco, please give me the schematic circuit of 20 Hz Thank you

[FrancoItaly]

Hello Mr. Franco, please give me the schematic circuit of 20 Hz Thank you

As I have already stated previously, I am not giving help for this version, as out of the 3 lrls created only one works well, for the other two it does not.