Lrl from Italy

[zakari]

thank you so much

[folharin]

mr franco...No, you relied on 8mhz?

[folharin]

Most of the group as well as esteban believe in 60khz up to 70 khz

[folharin]

because you 8 mhz?

[FrancoItaly]

the internal oscillator oscillates at 8MHz but this signal is not transmitted, the signal received by the antenna is of the order of about 100Mhz, my rl is a passive receiver. I think that the frequency of the "phenomenon" is in the range 60kHz - 100Mhz- infrared, so you can build lrls that work in this range, but in any case I think it is always passive receivers and the oscillator signal (60kHz in Alonzo pistol) serves only to provide a stable signal "background", in fact, Esteban said that the LRL could also work with the oscillator off.

[LRLMAN]

LRL DETECTS ONLY IRON

the phenomenon has a very wide frequency range, it comes to finding the most suitable, then L1 / c10 must be varied to have the most large signal (DC output). More could not tell you.

Hello Friend Franco, My Lrl by franco 8 mhz cristal quarts only detect iron...... What values should I change in L1 and C10 so that it can detect metals such as gold and silver or some other conductive metal? .... there is a place that is overcrowded with copper metal and I have gone to prospect and I have taken out a lot of copper metal But I can not detect copper buried with the Lrl by Franco what can I do ???

Here a coper bar that i found in the place that i coment here.....

Lrlman.

[LRLMAN]

the image i can upload

[FrancoItaly]

I do not see the picture, however in my experience varying L1 / C10 changes little, that is, with L1 = 2 or 3 turns and C10 = 10pF or 22pF the result does not change, outside of these values, the LRL is not working. It is not possible that the LRL is sensitive to iron. You should bury a piece of silverware (some coins or a bracelet, or even cutlery) 20cm deep and wait a few months, then you can try the LRL. Keep in mind that the LRL must be calibrated for maximum sensitivity before it goes into self-oscillation and which is sensitive to the compass effect. I place again here an aid to tuning.

Regards

[folharin]

https://www.youtube.com/watch?v=8lRq37udd_M Test field with a silver coin and 2 gold rings buried within a year and a half

[folharin]

But this lrl has a problem, it detects about wire

[Mohlrl]

hi dear Faranco, thank you for your efforts and helps,i made your lrl with bc549c tr with 570 hfe, my lrl work well in house. this movie is reaction of my tools to phone.

http://uploadboy.me/t95ozw3d5p4c/video_2017-03-07_02-12-26.mov.html

one of my friend detect one very old Copper plat (Ancient with small size) from range 8 meter and depth 40 cm (it is noticeable that i live in iran). with lrl detected this metal with one led. i want to increase sensitive of lrl to detect with 2 or 3 led. i thought maybe if i use one MPSA18 tr with beta 840 and noise figure 2.5 (but bandwidth 100 MHz), the result will be better. otherwise some of friend offer to me to increase capacitor c9 to 1 nf so that it will increase sensitive. what do you think about this? I will be thankful if you help me and express your opinion about this.

[FrancoItaly]

If you've been following my "helps" you have adjusted the LRL for maximum sensitivity. The maximum sensitivity is achieved by adjusting the gain a little before starting the self-oscillation and the compass effect. Stretching the antenna from 30 to 60 or 70cm you get an increase in sensitivity but it can appear the compass effect. As for the transistors you can try to change it but I do not think there will be an improvement. However 8 meters is quite a distance and it is normal that turns on only one LED. As I have already said several times the test with the phone is not very reliable.

Best Regards

[Mohlrl]

thank you very mach Mr Franco. when the target was detected with one led from 8 meter, one led only stayed on even though distance decreased to 1 meter, decreasing on distance did not effect on lighting, is it normal? is it possible also tell me your opinion about capacitor c9?

[FrancoItaly]

If the LRL has 3 LEDs, approaching the target should come first 2 leds and then 3 leds.
C9 connects the antenna to the base of TR2, I think that the value is not critical, it is located in series with the base junction / emitter of TR2 (about 10pF) and in parallel with C10. For this reason if you do not use C10 LRL works the same, because there is always parallel to L1 the parasitic capacitance of thejunction base/emitter.

Best Regards

[Mohlrl]

although distance decreased from 8 to 1 meter,unfortunately only one led was on,it is while my lrl is very sensitive, it is showed in movie, it is why I try to increase sensitive more. i use version 3 with 3 led. maybe the Iran geography is different. i use 3 turns for L1. I am very apologize that took your time,but many different people in Iran like your lrl and try to make it, but in our sit, felezjoo.ir, after 200 page discussion about your lrl, we cant use it and best result is this one led light result. if you have any other offer for us, we are very enthusiastic to listen to it.
thank you very mach again