Lrl from Italy

[Nicolas]

[QUOTE=enjoykin4;153056]
Thank you Ukrainian so much interesting this projects. But relax my friend friend

[Geo]

Hi Franco.
Did you tried to give signal from generator to antenna (not directly but from some distance)?
I tried it yesterday, connected a wire 25cm to output of generator and put it at sweep operation from 65 to 165Mhz so to see where the coil of lrl is tuned. I put the antenna of lrl parallel with generaotr aerial and near to 30 cm. I did not found any frequency that lrl is tuned and the sensitivity was very low. At lrl i use a 3 turns coil with 22pf capacitor parallel with coil. Also i tried the same experiment with fm modulation but without good results (for me). Any experiment from you or any idea????

Regards

[brs]

hi Geo
Try it with bc238

[Geo]

My xtal lrl works ok.
I try to understand how exactly the phenomenon acts on it so to try make it more sensitive

[FrancoItaly]

Hi Geo,

I don't have a FM generator but I tried with an oscillator ( only 1 transistor) tuned in FM range and I had the same results, nothing, only a signal very close to antenna. The origin of the phenomenon remains for me always a mystery. However, the resonant circuit is important because if I change the values the LRL is not working. With 2 turns for L1 the lrl it's working also without 22pF as there is the parasitic capacitance of base-emitter junction.

Best Regards

[Geo]

I put the transistor on base so to make changes at mixer transistor and now lrl works better, maybe any bad soldering at pins of transistor. Now i have strong signal from 30cm distance. Lrl receives signals at 82...85Mhz and 87...88 Mhz. I"ll try to change teansistor with other types and to replace the 22pF with a variable capaqcitor (trimmer) so to change frequences. Do you think that is better to try at frequences highter than 108Mhz ????

Regards

[FrancoItaly]

Hi Geo,

If you have time you may try the range 60 - 200Mhz, the BC... series work also at 200Mhz and the trimmer it's a good idea. You can also test if there is some discrimination changing LC resonance.

Best Regards

[Geo]

Hi Franco.
I will inform if any change will give better results.
""Phainomenon"" is a very strange phainomenon....

[Qiaozhi]

enjoykin4 - Having just spent several minutes erasing your abusive posts, rants, and derogatory pictures, it appears that you may be incapable of reading the forum rules. In particular, please read this ->

***********************************************
LRL forums historically have a tendency to bring out the worst in some people. Personal attacks and taunts will not be tolerated. This includes verbal (you're an idiot) and pictorial (posting a derogatory picture). Violations will result in an infraction and possible suspension.
***********************************************

You have already had a number of warnings, and this is your very last chance.
One more abusive post and you're out!

[enjoykin4]

Originally Posted by Qiaozhi

***********************************************
You have already had a number of warnings, and this is your very last chance.
One more abusive post and you're out!

.................................................. .............................



OK AMERICAN SMARTY !!

I AM GOING TO MUCH BETTER PLACE THAN YOUR FORUM IS !!

YOU HAVE MY FINAL PERMISSION TO DELETE ALL MY POSTS AND ACCOUNT AT THIS FORUM !!

ASTALAVISTA MUCHACHOS !!

Enjoykin4
Enjoykin4@YANDEX.RU


ps: Ну ладно. Даже если Вы увидите Знания у человека, который предлагает их использовать, Вы не сможете это сделать, ТАК КАК В Вашей ПРОГРАММЕ НЕТ ЭТОГО ЭЛЕМЕНТА.

[Geo]

Originally Posted by Geo

Hi Franco.
I will inform if any change will give better results.
""Phainomenon"" is a very strange phainomenon....

I replaced the transistor of mixer with a BF240 and now the xtal version is more sensitive. Now it receives the signal from generatior more far than 3m with a good signal. I also connected a μammeter so to "see" if a change is negative.
Next days will go to field for test
Regards

[FrancoItaly]

Hi Geo,

Good idea, BF240 is a true RF transistor also, I think, with less beta gain, but if DC out is OK then the lrl should work equally.

Regards

[Geo]

Originally Posted by FrancoItaly

Hi Geo,

Good idea, BF240 is a true RF transistor also, I think, with less beta gain, but if DC out is OK then the lrl should work equally.

Regards

Hi Franco.
First.. i tried it at Multisim and gives 2x more signal at output of mixer compared with BC183.
I did not measure the DC out but it seems to work perfect.

Regards

[brs]

hi franco
hi friends
lrl Must be Work near Radio stations
Stay away if Broken sense to be a transmitter
I want to transmitter pcb or Electronic circuit
and how much the transmitter frequency.To penetrate the ground ,mhz , khz or hz ??

[FrancoItaly]

This thread is not for this, physics of metal detectors is not the same of the lrls.

Regards

[fmnotes]

Originally Posted by FrancoItaly

Hi Geo,

Good idea, BF240 is a true RF transistor also, I think, with less beta gain, but if DC out is OK then the lrl should work equally.

Regards

What exactly transistors can be replaced with BF240????
1 , 2 , 3 or 4 transistors.
You can be noted in the schematic???
thank's

[FrancoItaly]

TR1 with quartz version and TR2 with CD4046 version.

[Arionas]

Originally Posted by FrancoItaly

TR1 with quartz version and TR2 with CD4046 version.

http://postimg.org/image/gjj2jx2zv/
http://postimg.org/image/v47ww6g99/

[FrancoItaly]

I post the two versions again.

[FrancoItaly]

Here the rest of the LRL, the power is supplied from two 9V batteries connected in series for a total of 18V. In the version with 3 LEDs it is not represented but the power supply stage is the same as the version with 1 LED.

[fmnotes]

Thank's Franco

[Mohlrl]

Hello Mr. Franco. Thank you for your efforts and providing device. I built 8mhz quartz version with bc237b transistor (I had access only to this transistor). The output voltage of device is 4.3 volts. When I'm close to the antenna my hand,one light led went off. But device don’t react to mobile. Device performance is good? Thanks for expressing your opinions. One movie is attached.
http://www.uploadmb.com/dw.php?id=1460808977

[FrancoItaly]

Hi Mohlrl,

the behavior is ok, you only need a test on the field with a long buried target.

regards

[Mohlrl]

Thanks very much for Help Mr Franco

[RIMES]

Hi Mr Franco;
Mr Franco thank you, I have made your device with 8 MHz, but the antenna I used the model shown in the picture attached (a single round of 8 centimeter diameter) and when I touch with my hand the LED lights, is it good?
http://www.longrangelocators.com/for...&postcount=600