Lrl from Italy

[sakher]

hello Mr.franco
Should we take into consideration the Frequency of the erea and set the device frequency?

http://www.longrangelocators.com/forums/attachment.php?attachmentid=18926&stc=1&d=1395622350

[FrancoItaly]

hello Mr.franco
Should we take into consideration the Frequency of the erea and set the device frequency?

http://www.longrangelocators.com/for...1&d=1395622350

I cannot help you, there is no particular frequency of operation, my lrl works in the FM range, about 90 - 130Mhz but it is not linked to any radio broadcaster, Esteban said that even an FM receiver (not tuned to any station) could work as lrl.

[darkman]

HI ALL ,,
what is the best antenna for good resort ? coz my lrl does not respond to the test field .
note : my test field is a gold ring 14k , 2 grams , 30cm depth , 2 years .
output 5.355 vdc , respond to mobile signal , when i touch antenna the output = 5.325 .
i used 0.5pf In a place C2,C3,C4 . C1=470pf.
regards ..

[FrancoItaly]

HI ALL ,,
what is the best antenna for good resort ? coz my lrl does not respond to the test field .
note : my test field is a gold ring 14k , 2 grams , 30cm depth , 2 years .
output 5.355 vdc , respond to mobile signal , when i touch antenna the output = 5.325 .
i used 0.5pf In a place C2,C3,C4 . C1=470pf.
regards ..

The values are correct, I think you have read the helps. what still needs to be established is whether the gain is sufficient. To verify this, increase the gain until the compass effect appears, then decrease it until it disappears. Try R1= 69K, R2 = 100K, P2 = 1M.
The best antenna for me it's stylus that which can be extended up to 60cm with increased sensitivity.

[abdou2014]

Franco LRL modified

[HaFar2010]

Hello
Dear Franco.
I have a main question about results of you LRL. Do you think, beside buried non-ferrous metal, it's also possible to detect nugget?

[FrancoItaly]

Hello
Dear Franco.
I have a main question about results of you LRL. Do you think, beside buried non-ferrous metal, it's also possible to detect nugget?

I think yes, but I have not experiences.

[Milad.salsa]

hi mr franco
when i touched the anttena voltage was increased،my circuit is ok?

[FrancoItaly]

hi mr franco
when i touched the anttena voltage was increased،my circuit is ok?

Yes, the important thing is a change of amplitude.

[toorani]

hi franco dear
Thank you very much for your great work
Thank you very much for your plan
I built your circuit,I tried to make your pcb ,I attached the following layer to the ground And I used philips bc550c transistor,
But I do not know why with the touch of the antenna, the output voltage (the emitter tr5) does not change (it does not decrease).
What should I do to test the correctness of the circuit?
By changing the capacitors c2, c3, c4 and c13, c14 and c1, the output voltage does not change.why?
The values of the transistor base voltage are as follows:
tr1 e=3.34 volt b=3.98 v c=11.01 v
tr2 e=0 b= 0.57 v c=8.66 v
tr3 e=0.45 v b= 1.03 v c=9.15 v
tr4 e=0.51 v b=1.09 v c=8.88 v
tr5 e=2.35 v b=2.93 v c= 11.33 v
Is this true?
Thank you so much Franco dear

http://s9.picofile.com/file/8319666992/photo_2018_02_19_20_31_58.jpg

http://s8.picofile.com/file/8319666884/photo_2018_02_19_20_32_49.jpg

http://s8.picofile.com/file/8319667200/photo_2018_02_19_20_32_45.jpg

http://s8.picofile.com/file/8319667300/photo_2018_02_19_20_32_40.jpg

[FrancoItaly]

hi franco dear
Thank you very much for your great work
Thank you very much for your plan
I built your circuit,I tried to make your pcb ,I attached the following layer to the ground And I used philips bc550c transistor,
But I do not know why with the touch of the antenna, the output voltage (the emitter tr5) does not change (it does not decrease).
What should I do to test the correctness of the circuit?
By changing the capacitors c2, c3, c4 and c13, c14 and c1, the output voltage does not change.why?
The values of the transistor base voltage are as follows:
tr1 e=3.34 volt b=3.98 v c=11.01 v
tr2 e=0 b= 0.57 v c=8.66 v
tr3 e=0.45 v b= 1.03 v c=9.15 v
tr4 e=0.51 v b=1.09 v c=8.88 v
tr5 e=2.35 v b=2.93 v c= 11.33 v
Is this true?
Thank you so much Franco dear

http://s9.picofile.com/file/8319666992/photo_2018_02_19_20_31_58.jpg

http://s8.picofile.com/file/8319666884/photo_2018_02_19_20_32_49.jpg

http://s8.picofile.com/file/8319667200/photo_2018_02_19_20_32_45.jpg

http://s8.picofile.com/file/83196673...9_20_32_40.jpg

Its possible that the lrl is self oscillating. Detach the quartz and controls the voltages again. TR2/TR3/TR4 collectors are to high, it must be about 5-6V, try 820K or 680K for R6, R8 and R11. Follow the instructions of my helps.

[toorani]

Its possible that the lrl is self oscillating. Detach the quartz and controls the voltages again. TR2/TR3/TR4 collectors are to high, it must be about 5-6V, try 820K or 680K for R6, R8 and R11. Follow the instructions of my helps.

Thank you very much for your guide

[toorani]

hi franco dear
I Detached the quartz and controls the voltages again ,But the voltages are the same as before. try 820K or 550k for R6, R8 and R11,But voltages vary by about 0.2 volt.
What is the reason for your opinion?
Thank you very much for your guide

[toorani]

hi franco dear
I Detached the quartz and controls the voltages again ,But the voltages are the same as before. try 820K or 550k for R6, R8 and R11,But voltages vary by about 0.2 volt.
What is the reason for your opinion?
Thank you very much for your guide

In my opinion, this will fix the problem by increasing the resistor of tr1, tr2 and tr3 (r7, r9 and r13).Is that right?
Or r6, r8 and r11 resistance should be very low

[FrancoItaly]

In my opinion, this will fix the problem by increasing the resistor of tr1, tr2 and tr3 (r7, r9 and r13).Is that right?
Or r6, r8 and r11 resistance should be very low

When you remove the quartz the TR5 emitter must be zero, if not it means that the sensor stage is self oscillating. If this is the case you must decrease C13/C14 (470pF or 390pF or less).