Lrl from Italy

[folharin]

group stopped?

[FrancoItaly]

Originally Posted by folharin

group stopped?

I think there are major problems that people face right now, however I am there.

[folharin]

[detec]

Originally Posted by walkman

My FrancoLRL-2

Thanks so much Franco

hi all, i need to know the coils specs at the bottom left near the antenna if i should solder 2 coils also the potentiometers and antenna and vumeter specs and thank you in advance.

[FrancoItaly]

Originally Posted by detec

hi all, i need to know the coils specs at the bottom left near the antenna if i should solder 2 coils also the potentiometers and antenna and vumeter specs and thank you in advance.

Sorry but I don't understand what you mean.

[detec]

thank you for your reply , i already made the walkman pcp and theres a version with 2 coils i put them both, i wanna ask if it will work, and the difference between 1 and 2 coils also the pot. and vu and gnd wiring as im a little familiar with pi and vlf but experementing with lrl and thank you again for your help.
ay extra tips or advice will be much appreciated
i used 184c

[Pahom]

Originally Posted by detec

thank you for your reply , i already made the walkman pcp and theres a version with 2 coils i put them both, i wanna ask if it will work, and the difference between 1 and 2 coils also the pot. and vu and gnd wiring as im a little familiar with pi and vlf but experementing with lrl and thank you again for your help.
ay extra tips or advice will be much appreciated
i used 184c

Concho will work if you correctly tune the input part and select the amplitude of the generator.

[detec]

thank you for your answer

[shahrayar]

Franco, is this based on radio transmitting stations?

[FrancoItaly]

Originally Posted by shahrayar

Franco, is this based on radio transmitting stations?

I don't think so, even if near transmitters the lrl is saturated by the strong signal. The phenomenon is very complex and according to official science it does not exist. The fact remains that several forum members have told me that they have made many discoveries.

[shahrayar]

Originally Posted by FrancoItaly

I don't think so, even if near transmitters the lrl is saturated by the strong signal. The phenomenon is very complex and according to official science it does not exist. The fact remains that several forum members have told me that they have made many discoveries.

Thank you, Franco, but the radio broadcasts have to stop until we're sure
Really strange thing

[folharin]

Originally Posted by FrancoItaly

I don't think so, even if near transmitters the lrl is saturated by the strong signal. The phenomenon is very complex and according to official science it does not exist. The fact remains that several forum members have told me that they have made many discoveries.

can you tell me which
member?..until today I haven't seen anyone in the group with good results with their lrl

[FrancoItaly]

Originally Posted by folharin

can you tell me which
member?..until today I haven't seen anyone in the group with good results with their lrl

Most have contacted me via e-mail, however I invite whoever wants to confirm it on the forum, if they have no problems.

[Trojanali58]

Hello Mr. Franco I Wish You And Your Family Health And Well-Being. Thank You Very Much For Publishing This Circuit. The Circuit is Working Very Well And I Have Built Your 8 Mhz Circuit. I Discovered a Very Good Place With The Circuit.

[FrancoItaly]

Originally Posted by Trojanali58

Hello Mr. Franco I Wish You And Your Family Health And Well-Being. Thank You Very Much For Publishing This Circuit. The Circuit is Working Very Well And I Have Built Your 8 Mhz Circuit. I Discovered a Very Good Place With The Circuit.

I am glad that you have had good results, I repeat that the tuning must be accurate, just before the self oscillation starts, in this way you get a good sensitivity.

[Inna]

Hello to all this wonderful forum, I've just joined and I'm starting to make the project at 8MHz.
Meanwhile, a special thanks to Mr. Franco, a great person.
I would like to ask him or anyone who can kindly answer me: since this project has been modified by several people,
I can't figure out, for example, how many potentiometers there are to adjust outside the box, what values ​​they have and
where to connect them on the pcb. I specify that I made the Walkman pcb, the last one above, but I don't know if it's updated enough
to the various changes (for example there'nt the low battery control) but it is'nt a problem. Is there anyone who has an complete overall scheme or diagram

where it is possible to distinguish which are the potentiometers and which are the trimmers and how correct use in field search.
Thank you all.

[FrancoItaly]

Originally Posted by Inna

Hello to all this wonderful forum, I've just joined and I'm starting to make the project at 8MHz.
Meanwhile, a special thanks to Mr. Franco, a great person.
I would like to ask him or anyone who can kindly answer me: since this project has been modified by several people,
I can't figure out, for example, how many potentiometers there are to adjust outside the box, what values ​​they have and
where to connect them on the pcb. I specify that I made the Walkman pcb, the last one above, but I don't know if it's updated enough
to the various changes (for example there'nt the low battery control) but it is'nt a problem. Is there anyone who has an complete overall scheme or diagram

where it is possible to distinguish which are the potentiometers and which are the trimmers and how correct use in field search.
Thank you all.

I post again the original lrl, modified with two pots for tuning and one for gain. The power supply stage with low battery is the one in the version with one LED, in the version with 3 LEDs it is not indicated but that of the 1 LED version must be used. The low battery regulation is a trimmer.

[Inna]

Dear Mr. Franco, I'm Italian and I would really liked to meet you in person because until a few years ago I lived in Genoa. But now unfortunately I find myself very far from Liguria. Besides, even my name is "Franco". I apologize again because I don't have a lot of experience in electronics, I'm a self-taught hobbyist. So if I choose to insert the new display stage, the external adjustment potentiometers would be: P1 of 47k. P2 of 1 Mega, P3 of 10k, it is right? Instead the power stage remains common for both versions and the antenna amplifier has a 4k7 trimmer. I would very much like to be able to write to you privately, but I'm not sure how to do it. Thank you for your great availability and kindness, as I have been able to see in this forum even with non-grateful people.

[FrancoItaly]

Originally Posted by Inna

Dear Mr. Franco, I'm Italian and I would really liked to meet you in person because until a few years ago I lived in Genoa. But now unfortunately I find myself very far from Liguria. Besides, even my name is "Franco". I apologize again because I don't have a lot of experience in electronics, I'm a self-taught hobbyist. So if I choose to insert the new display stage, the external adjustment potentiometers would be: P1 of 47k. P2 of 1 Mega, P3 of 10k, it is right? Instead the power stage remains common for both versions and the antenna amplifier has a 4k7 trimmer. I would very much like to be able to write to you privately, but I'm not sure how to do it. Thank you for your great availability and kindness, as I have been able to see in this forum even with non-grateful people.

I sent you a private message, potentiometers are ok.

[Dubulumach]

Hello FrancoItaly and all

There is one optimal frequency 115.674 MHz and two variants of HC-49U quartz crystals.
1st. 115.5278 MHz main freq.
2nd. Overtone quartz 10.695 MHz or 10.700 MHz both are near geometric mean of main LC resonant tanl circuit.
L1 3 turns, wire diameter 1mm, 1.09mm enamelled, at 10 mm coil form, 10.5 mm lenght of coil with 3mm winding pitch.
Primary inductance 0.086 uH or 86 nH
Series resistance - 2.304 mOhm
Parallel resistance - 38.14 KOhm
Parallel capacitance Cs - 0.338 pico
Self resonant freq Fsr is very high 1.0895 GHz, wit Q-factor 619 and ESR 0.1 Ohm at 115.674 MHz
Together wit C10 ~ 22 pico, -3dB(Δf) bandwidth of parallel tank-circuit L1C10 is 302.5 KHz, Z= 63 Ohm and eq.resistance is Req = 21.93 KOhm.
Very probably LRL range is somewhere plus or minus 5Mhz from main oscillating LC tank-circuit freq. It should be from 110.5Mhz - 120.5 MHz. Phenomenon is very complex and no one living could explain it. It's all matter of experiments.

Regards

[FrancoItaly]

Originally Posted by Dubulumach

Hello FrancoItaly and all

There is one optimal frequency 115.674 MHz and two variants of HC-49U quartz crystals.
1st. 115.5278 MHz main freq.
2nd. Overtone quartz 10.695 MHz or 10.700 MHz both are near geometric mean of main LC resonant tanl circuit.
L1 3 turns, wire diameter 1mm, 1.09mm enamelled, at 10 mm coil form, 10.5 mm lenght of coil with 3mm winding pitch.
Primary inductance 0.086 uH or 86 nH
Series resistance - 2.304 mOhm
Parallel resistance - 38.14 KOhm
Parallel capacitance Cs - 0.338 pico
Self resonant freq Fsr is very high 1.0895 GHz, wit Q-factor 619 and ESR 0.1 Ohm at 115.674 MHz
Together wit C10 ~ 22 pico, -3dB(Δf) bandwidth of parallel tank-circuit L1C10 is 302.5 KHz, Z= 63 Ohm and eq.resistance is Req = 21.93 KOhm.
Very probably LRL range is somewhere plus or minus 5Mhz from main oscillating LC tank-circuit freq. It should be from 110.5Mhz - 120.5 MHz. Phenomenon is very complex and no one living could explain it. It's all matter of experiments.

Regards

Thanks for all these calculations, the 20 Mhz version operates by tuning L1/C10 on a higher harmonic of 20Mhz, thus increasing the efficiency of the mixer and therefore with a greater sensitivity of the sensor stage. The main problem is to avoid self oscillation.

[FrancoItaly]

Originally Posted by walkman

My youtube channel

https://www.youtube.com/watch?v=BQ3aaN044MA

https://www.youtube.com/watch?v=wtgtj7G6L6U

https://www.youtube.com/watch?v=Sl4VtAmxCm0

https://www.youtube.com/watch?v=yR3tzT2Jd-g

[omar]

Hi Franco, why didn't you use a germanium diode? It has a wide range and ten times more sensitivity than a silicon diode 4148.

[FrancoItaly]

Originally Posted by omar

Hi Franco, why didn't you use a germanium diode? It has a wide range and ten times more sensitivity than a silicon diode 4148.

Germanium diodes are clearly inferior to silicon ones, the only advantage is to use them where a lower voltage drop is required. I don't understand what you mean by higher sensitivity, diodes don't amplify.

[Inna]

Hi, anyone could tell me what is the correct value to consider when the battery is low in this project (8 Mhz) ? Perhaps 11 Volt is right or other values?
Thanks at all.