Hi Esteban
I remember an old instrument, a Grid-dip-meter, used in order to determine the resonance frequency of a tuned coil, without some electric contact. the tuned coil it absorbed some very little energy from tube oscillator and it caused a change in some parameters of the instrument. This was possible for the very high impedance of the input grid tube. I think that a coil tuned on a high armonic of a oscillator acts as a sort of frequency converter, that's it can translate in a lower frequency any change of the high frequency. For Morgan I am a lot interested of Damasio'book but I don't think that it's possible for me to obtain a English translation, however I thank you.
Best Regards
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