Hi All
I think that the frequency isn't important and depends on the characteristics of the circuit, it's around 5Mhz. Inside the circle there is L1. You must remember that the Lrl is a passive receiver/converter, It transforms the "phenomenon" by modulating an existing signal (the 5Mhz oscillator). As I said before I'm not sure that Nicoals' pcb works well because in my pcb the oscillations are generated by a parasite link from TR3 collector and TR1 base. If the oscillations are between TR3 and TR2 the "phenomenon" cannot influence the oscillator. I spent a lot of time to try to understand this circuit, other types of oscillators don't work.
Best Regards
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