For convenience, the calibration is done with a piece of wire instead of the antenna, but it could also be done with the antenna as long as it is placed about 10 cm from L1. The length of the antenna, during calibration, is 40 cm, but you can vary it and see the result. Honestly, I've never measured the piece of wire, I use a connector with two crocodiles and I measured it now, it's 40cm.
These values are indicative, unfortunately the sensor stage is very critical and it is important to obtain maximum gain because the "phenomenon" has a very small amplitude.
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