Lrl from Italy

[FrancoItaly]

hello Mr franco, I hope you doing well
I want to make an antenna for very low-frequency range from 20-100 hz
but i do not know, can you help me

I have already responded to you privately.

[FrancoItaly]

for a new member, Canozkaya

I post the original version of my lrl.

[Canozkaya]

I post the original version of my lrl.

thank you teacher 🌹

[Canozkaya]

Hi ionios

It is connect to collector Transistor TR4

Look this detail

Hello Nicolas, I want to try the Franco lrl circuit diagram, but I have a few questions that I want to do on the copper plate, can I ask, can you help me?

[FrancoItaly]

I post the original version of my lrl.

This is the entire lrl on a single pcb made by Dream Man, but I didn't make it, I still recommend a pcb just for the sensor stage.

[defineci35]

I couldn't figure out the logic of 8 Mhz crystal.

Hi FrancoItaly, I tried the circuit you made and got positive results, but I couldn't figure out the logic of the 8 Mhz crystal in the circuit. Would you mind explaining it?

[FrancoItaly]

Hi FrancoItaly, I tried the circuit you made and got positive results, but I couldn't figure out the logic of the 8 Mhz crystal in the circuit. Would you mind explaining it?

The 8 MHz signal serves as a reference for the mixer, to have a stable DC output even in the absence of the phenomenon, the maximum sensitivity is achieved with the 20 MHz oscillator and by adjusting L1/C10 on one of its harmonics to have the maximum signal. The 8 MHz oscillator has harmonics that are too small to use.

[defineci35]

thank you good work

[amir9297]

Welcome . They say in general metals reflect the electromagnetic beam and begin to resonate at the harmonic frequency only. For example, if a plate of gold is placed between two sheets of copper at the signal entrance of a highly sensitive electronic receiver, the plate of gold will prevent the signals from passing through and reflect them. In contrast, it will absorb and pass the harmonic signal. What do you think of this filter? I think the signal is treated like high frequencies, microwaves, similar in small capacitance. with a low pulse. Is there a comment.

Hello, Mr. Omar. I follow your content. Your ideas are great. Those who have a deep understanding of the phenomenon and its effects can understand your ideas. Your idea about molecular vibration is quite practical. There are many subjects in physics and electricity that are not taught properly and conceptually, if you research about making a plasma capacitor, you can make your desired sensor. In my opinion, the effect of the phenomenon is nuclear magnetic resonance of metals, which occurs in the earth due to triboelectricity.

[Frederick1986]

How many meters does it work?

[Frederick1986]

Hi dear friend.
Yes, I always try to get the effect of the sky, but it is not absolutely necessary.
That is, if the effect of the sky is not detected in a certain place, if a valuable metal is buried there that has a long burial life, it will definitely be detected. You just need to reach the maximum sensitivity in the way of settings in that place.
This is an empirical value.

How many meters does it work?

[Canozkaya]

This is the entire lrl on a single pcb made by Dream Man, but I didn't make it, I still recommend a pcb just for the sensor stage.

Let me give you some advice, I tried it and got positive results, make a frequency filter circuit at the antenna input, it works very well for discrimination.

[tasmen]

Let me give you some advice, I tried it and got positive results, make a frequency filter circuit at the antenna input, it works very well for discrimination.

Hi friend,
can you present it frequency filter circuit at the antenna input and its connection?

[UltraLRL]

Antenna Tuner Freq for 20 MHz

Hi Dear Franco
In 20 MHz Version, you used LC circuit (C10 & L1) as antenna tuner. if we assume L1 roughly about 50nH (3 turn air core, 10mm Dia, 15 mm length) and C10 from 10pF to 100pF then the resonance of tune circuit will be somewhere between 71-225 MHz .

Resonance frequency supposed to be around 20MHz or I missed something...?

[UltraLRL]

Antenna Tuner Freq for 20 MHz

Even if we assume L1 as two 100nH inductors in parallel (Equal to 50 nH), tank circuit goes from 50-160 MHz .
L1/2 and C9 forms a high-pass filter with cutoff frequency 21.268 MHz .