Quote:
Originally Posted by FrancoItaly
My lrl doesn't have a coil as antenna only a 30cm rod antenna.
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As I see, you have inductor L1 in sensor stage. This inductor (in input tank circuit) works as antenna or better to say EM sensor (wish you or not), except if it is proper EM shielded (with Mu-metal shield or something alike).
On other side Rod antenna is inductor in (Earth) magnetic field too, and very sensitive input device can sense inductor movement in magnetic field. This induced effect is different if you move rod inductor along or crosswise to Earth magnetic field lines. A year or two ago I take (for Geo thread here) video to show how this works. Basic physics - no magic.