Lrl from Italy

[FrancoItaly]

Hi Nicolas
Perhaps you can try other frequencies but you must remember that the "heart" of the circuit are L1, C1 and C2, with these values and the parasitic capacitor there is only one working frequence. If we change L1 or C1 or C2 or all these together I'm not sure that the "phenomenon" is detectable. However, it is always useful to experiment with new solutions.

Best Regards

[Nicolas]

Hi Nicolas
Perhaps you can try other frequencies but you must remember that the "heart" of the circuit are L1, C1 and C2, with these values and the parasitic capacitor there is only one working frequence. If we change L1 or C1 or C2 or all these together I'm not sure that the "phenomenon" is detectable. However, it is always useful to experiment with new solutions.

Best Regards

Hi Franco Can you tell me what is the inductance value for your L1?

Yes I agree with that you said

[FrancoItaly]

Hi Nicolas
I'm not in Italy, but I remember that inductance is less than 1 microhenry, I think that the value is not critic, surely 3 turns are ok.
Regards

[Nicolas]

Hi Nicolas
I'm not in Italy, but I remember that inductance is less than 1 microhenry, I think that the value is not critic, surely 3 turns are ok.
Regards

Ok thanks Franco
good tavel and return

[FrancoItaly]

Hi Nicolas
I return tomorrow, about 400 km of travel. What is your city? My is near Imperia.
Regards

[Nicolas]

Hi Nicolas
I return tomorrow, about 400 km of travel. What is your city? My is near Imperia.
Regards

Welcome franco
My city is Lamezia Terme Regione Catanzaro
But now not live there. me too.

-------------
Benvenuti franco
La mia città è Lamezia Terme Regione Catanzaro
Ma ora non vivere lì. anch'io

[Morgan]

two type of selector

one little mistake, no need to cut the coil cables,just cut the capacitor 6n8 and connect the selector tho the PINs in the circuit.

Here is for adapt to PDK-2.1 ,two diferent selector according the problems found in each country :


Its not difficult to build this simple selector ,need only to cut the original 6n8 cap. that is in paralel with the RX receptor coil,and use the cuted legs of the cap. to solder the SELECTOR wires.
In the photos i show the place where 6n8 was removed to give place for selector wires.
Any question cotact my email or send PM

[FrancoItaly]

Hi All
this is my Christmas gift it's another version of my Lrl more sensitive but less difficult to build. The oscillation comes from a CD4046 and we measure the phase change between the VCO and the output of the amplifier stage (TR2-TR3 and TR4). As antenna you can use a stylus or (better for me) a coil antenna. The capacitors C8 and C9 are connected in series for a single 0.5 pF capacitor (I think difficult to find). The power stage is the same of the other Lrl. In this simplified version there is only a led but is better to use more leds, I use a LM3914 to drive ten leds. The frequency is in the range 2.8 - 3.0 Mhz with the P1 cursor close to + 12V. Also the P2 cursor is close to positive and this means a small signal to input amplifier stage.

Best Regards

[FrancoItaly]

I forgot L1, it's the same of the other Lrl, that's 3 turns air core, 10 mm diameter.

[FrancoItaly]

I forgot also C18, it's 4.7 nF.

[Sneshko]

Hi FrancoItaly!
You're the real Santa Claus!
Thank you very much!
Merry Christmas FrancoItaly!
Regards and All the Best!
Sneshko

[Geo]

Hi Franco, thanks for the new schematic.
Does it has more detecting distance or it is the same????

My wishes for Merry Christmas and Happy New Year

[FrancoItaly]

Hi Geo
I tested this Lrl only near my home with an unknow target and the signal is 50% more than the other Lrl and now I'm in Switzerland and I decided to post the new schemas. As I said this circuit is an amplifier and not an oscillator and it's more easy to build. It's also possible to change the frequency and the amplitude of the signal. I'll do other tests when I will return to Italy. It's also possible to change the turns in coil antenna for better results. Perhaps with this Lrl You'll have good results, indeed it seems strange to me that in Greece there is no "phenomenon".
Best wishes to you and family

[Geo]

Hi Franco.
Again at Switzerland!!!!!
It is very good news that you catch the phenomenon with stronger signal, so you will locate the object from longer distance. Now i "play" with 3 projects, when i"ll finish with them i"ll construct your lrl so to see what is happening this time at my field area. Did you see any problem with high moisture and low temperature???

Regards

[FrancoItaly]

Hi Geo
In Switzerland I have more time to think about the "phenomenon" and ... other stuff. I haven't noticed any change with high moisture and low temperature, but in my country the temperature is never too low. I am very pleased by the fact that with this Lrl there is no "compass effect".
Regards