Lrl from Italy

[Jeg]

Hi Franco

Thanks for the answer. What about if a commercial fm station transmits on the same frequency like your tuned input? Will your system saturate?

[FrancoItaly]

Hi Franco

Thanks for the answer. What about if a commercial fm station transmits on the same frequency like your tuned input? Will your system saturate?

Near the FM transmitters, a few hundred meters, the lrl is useless, too many false signals.

[Jeg]

Very useful notice tnks.

[Jeg]

Hi Franco
Just to tell you that your circuit is amazing. Great technique, and to mention that sensor circuit doesn't need any modifications at all!

Adjusted as to give me 1200mV at the output of sensor. Starts decreasing as i approach my hand close to the antenna at 40cm. When i finally touch it, it goes as down as 950mV. Almost 300mV decrement. Really great Franco. Thanks a lot. Its time for the indication stage.

ps. I solved my issue at the input. The increased oscillator's signal across the tank circuit was due to capacitive coupling. It came at the right levels when i isolated oscillator in a faraday type cage.

[FrancoItaly]

Hi Franco
Just to tell you that your circuit is amazing. Great technique, and to mention that sensor circuit doesn't need any modifications at all!

Adjusted as to give me 1200mV at the output of sensor. Starts decreasing as i approach my hand close to the antenna at 40cm. When i finally touch it, it goes as down as 950mV. Almost 300mV decrement. Really great Franco. Thanks a lot. Its time for the indication stage.

ps. I solved my issue at the input. The increased oscillator's signal across the tank circuit was due to capacitive coupling. It came at the right levels when i isolated oscillator in a faraday type cage.

I am happy that you have succeeded in the realization, of course the final and field testing. in the past I have also recommended shielding the entire box, including the handle, with grounded aluminum foil.

[Jeg]

I have also recommended shielding the entire box, including the handle, with grounded aluminum foil.

For sure it would contribute in to a more clean amplification of the effect, but if inside the box is not taken in consideration the interaction between oscillator and the rest of the device there would be no way for setting the input level at minimums (due to capacitive coupling). I used a 16Mhz crystal by the way. No stability problems and clean signalling. Tuned to 32Mhz.

[brain]

I think I detected the iron frequency 68,490 khz.

[Pahom]

I think I detected the iron frequency 68,490 khz.

What device did you do it

[kostas87]

Hello Franco !
we have made the original version, we replaced the coil 3 turns with tsok ferrite. I think it goes quite well at 2 maybe 1 meter from a buried object with a phenomenon..the setting is very marginal just before the last led hits and when I turn it to the sky it hits gently..I detect with a slight inclination to the ground. do you think this is a normal function?

[JHERICKU]

I am busy on a lrl working with a PIR
Good wishs for you and all[/QUOTE]

Hello sir..can u update about this project using pir on lrl..Thank u..

[FrancoItaly]

Hello Franco !
we have made the original version, we replaced the coil 3 turns with tsok ferrite. I think it goes quite well at 2 maybe 1 meter from a buried object with a phenomenon..the setting is very marginal just before the last led hits and when I turn it to the sky it hits gently..I detect with a slight inclination to the ground. do you think this is a normal function?

The operation is not correct, in the absence of a phenomenon the lrl must remain silent, however it is tilted. I don't think it is not a good idea to use a ferrite since we are in the FM range, around 100 Mhz, normal ferrites do not reach these frequencies.

[JHERICKU]

Hello Franco..I sent a private Message..this was regards to the partslist of your original lrl..I cannot visibly read the values especially ic1 and diodes..Thank u..

[kostas87]

The operation is not correct, in the absence of a phenomenon the lrl must remain silent, however it is tilted. I don't think it is not a good idea to use a ferrite since we are in the FM range, around 100 Mhz, normal ferrites do not reach these frequencies.

when there is no phenomenon there is no signal, you did not understand me..detects normally the phenomenon with very strong signals very close 1-2 meters when there is no problem when my direction is from north to south..but when I raise the antenna in the sky there is a signal from the sky..I make sure to adjust the device and have a signal up to the horizontal position.then I lower the device a little to the ground and the signal stops and I walk when I encounter a phenomenon the device emits a signal .. there is no signal continuously. ... basically I try to find the signals from the sky when they are connected to the earth ...

[FrancoItaly]

when there is no phenomenon there is no signal, you did not understand me..detects normally the phenomenon with very strong signals very close 1-2 meters when there is no problem when my direction is from north to south..but when I raise the antenna in the sky there is a signal from the sky..I make sure to adjust the device and have a signal up to the horizontal position.then I lower the device a little to the ground and the signal stops and I walk when I encounter a phenomenon the device emits a signal .. there is no signal continuously. ... basically I try to find the signals from the sky when they are connected to the earth ...

Usually the sky effect and the compass effect appear when there is too much amplification.

[FrancoItaly]

I put the original lrl again, as it was privately requested.