Lrl from Italy

[havoc88]

Thank you for your answer Mr. Franco. I think that I may have a npn with too much hfe for the antenna amplifier, I will replace it now. It's the only thing left.

[FrancoItaly]

Very good work, have you tried on the field?

[abdou2014]

vary nice designe bravo !
can you share us the pcb layout ?

[Nicolas]

My FrancoLRL-2

Thanks so much Franco

Hi oldest friend my congratulation its better them AKS we have our design here

[Nicolas]

Very good work, have you tried on the field?

Hello Franco yes its tested also its better to AKS thanks friend.

[FrancoItaly]

Hello Franco yes its tested also its better to AKS thanks friend.

Hello Nicolas how are you?

[okantex]

Hi Walkman

why did you place the circuit and antenna in metal tube

how is your antenna
2 ferrite type?

[Nicolas]

Hello Nicolas how are you?

Hello franco


I m fine thanks only so much busy. how are you oldest friend? I hope you good

[mohsendt]

hello Mr franco


is possible replace ltc6900 with crystal for variable frequency

https://www.analog.com/media/en/technical-documentation/data-sheets/6900fa.pdf

[FrancoItaly]

Hello franco


I m fine thanks only so much busy. how are you oldest friend? I hope you good

I'm quite well, thanks, given the age (68 years), the only drawback is that I have little time to experiment because most of the time I live far from my laboratory.

[FrancoItaly]

hello Mr franco


is possible replace ltc6900 with crystal for variable frequency
https://www.analog.com/media/en/tech...ets/6900fa.pdf

It is possible, but I think it is not necessary, simply by changing the quartz you get different frequencies. I tried 3/4/6/8/10 Mhz and I think that 8Mhz is the best value, even if with the other values the lrl works well anyway.

[Pahom]

Not a bad LTC 6900 chip, but Sinus is still better. The truth is that for some reason the sine on my generator is not clean, the question is a bit with a failure. How to make it clean without failure. According to pick up 33k, 47k and 330pf? A transistor with the letter B but I think that it is not the point.

[FrancoItaly]

Not a bad LTC 6900 chip, but Sinus is still better. The truth is that for some reason the sine on my generator is not clean, the question is a bit with a failure. How to make it clean without failure. According to pick up 33k, 47k and 330pf? A transistor with the letter B but I think that it is not the point.

Varying C1 changes the amplitude of the oscillator, however the waveform is not very important, an amplitude between 2 and 3 Volts from peak to peak is the optimal value. Too high a value would make calibration difficult. Keep in mind that the oscillator does not intervene directly in the reception of the "phenomenon", it only provides a carrier that will be somehow modulated by the phenomenon.

[totob]

hi i have a question
self oscillation can be exist in display stage or just in sensor stage?

[FrancoItaly]

hi i have a question
self oscillation can be exist in display stage or just in sensor stage?

Almost certainly in the sensor stage.