Hi Dubulumach,
my lrl "pulse induction" did not have the discrimination. I don't think that there is a single frequency i.e. only for gold and not for other metals. Perhaps there is a range of frequencies where the gold responds better then other metals, you can try putting in place of C10 a varactor diode and do a scan, manual with potentiometer or automatic with oscillator (0.5 Hz or less). Anyway I don't think that the discrimination is necessary, the lrl is not sensible for iron, if the target is out the range of a MD it is certainly an interesting metal, very unlikely to be aluminum or other "modern" metal. If the research area is in the mountains then it is unlikely that there will be much metal waste. The strength of an lrl is that it is possible to explore a large area in a short time even if there are almost insurmountable obstacles for an MD (vegetation, walls and ruins).
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