Lrl from Italy

[FrancoItaly]

I read some help before, how can I tell if the gain has decreased using a multimeter?

Measure the output of the Sensor Stage or the emitter of TR5 with a voltmeter (20V DC). The optimal value is in the range of 2-6V DC. The voltage must be stable. I want to remind you that my IRL is very critical, especially the sensor stage.

[gs78]

What difference does it make if the coil has 3 turns, 4 turns, or more?

[FrancoItaly]

What difference does it make if the coil has 3 turns, 4 turns, or more?

Change the resonant frequency to which the sensor stage is tuned, you can try to put 2 or 4 turns.

[gs78]

With 4 and 5 turns of the coil, some LED TVs and magneto devices are detected, but with 3 turns, nothing is detected. Is this working principle correct?

[FrancoItaly]

With 4 and 5 turns of the coil, some LED TVs and magneto devices are detected, but with 3 turns, nothing is detected. Is this working principle correct?

The phenomenon modulates signals already present. The amplitude of the sensor stage's DC output is proportional to the signal arriving from the outside and to the gain. This is achieved thanks to the TR2 mixer. However, a test site is needed, where, for example, a few silver coins can be buried at about 20 cm. After a few months, a signal should already be present.

[gs78]

Do you have the most up-to-date version of this device, Mr. Franco, or are you planning to create a new LRL?

[FrancoItaly]

Do you have the most up-to-date version of this device, Mr. Franco, or are you planning to create a new LRL?

Neither option, unfortunately I'm 75 years old and the only thing I can do is give some advice.

[FrancoItaly]

Neither option, unfortunately I'm 75 years old and the only thing I can do is give some advice.

Did you see the 20Mhz version I posted a few years ago?

[gs78]

Thank you for your efforts, Mr. Franco. So, which version is better in the field: the 8MHz or the 20MHz CD4046 version?

[FrancoItaly]

Thank you for your efforts, Mr. Franco. So, which version is better in the field: the 8MHz or the 20MHz CD4046 version?

The 20Mhz version is the most sensitive because the TR2 mixer receives 2 signals, 20 Mhz from the quartz oscillator and from L1/C10 a signal tuned to a 20Mhz harmonic, unfortunately it is also the most critical version due to the higher frequency.

[gs78]

I set up the 8MHz version, only removing the C2, C3, and C4 connectors and installing a 22-bit picofarad, using a 20MHz crystal. The device is very sensitive and its range has increased significantly. The output voltage fluctuates between 3.5 volts when I turn the antenna on and off. Is this normal, or should it remain constant?

[FrancoItaly]

I set up the 8MHz version, only removing the C2, C3, and C4 connectors and installing a 22-bit picofarad, using a 20MHz crystal. The device is very sensitive and its range has increased significantly. The output voltage fluctuates between 3.5 volts when I turn the antenna on and off. Is this normal, or should it remain constant?

It is normal for the antenna to influence the output otherwise it would not work.

[Zicos]

Hello Mr. Franco. I hope you are well. Bravo for continuing to help other people with your advice.

[FrancoItaly]

Hello Mr. Franco. I hope you are well. Bravo for continuing to help other people with your advice.

The total value of C2/C3/C4 is only used to set the sensor stage output to a specific value, for example: sensor stage output 4V, I increase the gain and the output drops to 8V, I decrease C2/C3/C4 until the sensor stage output drops to 4V again. The value of C2/C3/C4 is around 1 pF, higher values mean that the sensor stage has little amplification. I have found that to get an even lower value I have replaced C2/C3/C4 with two wrapped wires, adjusting the length of the wires to get the right value.

[gs78]

I installed the cd4046 lrl version, but it's not responding to anything; the LED on the antenna only turns off when I bring my hand close. Is this plan incomplete? I think it's not a plan that works like the 8 MHz version. Has anyone managed to get the cd4046 version working?