perhaps in this range there are emissions in the frequency on which the phenomenon acts. It was a coincidence that my LRL works, is not due to my studies, I have just realized that this circuit (RF sniffer) could reveal the phenomenon. I tried to change some values, such as inductance, capacitance in the resonant circuit, crystal frequency (3 to 10Mhz), but the best are the ones that I have indicated.
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