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L2= 18 cm x 11 cm BFO coil made of 12 or 15 turns,wire 0,25 mm. No Faraday Shield. PCB2 L1= Big Aluminium Antenna 22 cm x 30 cm(ion detector 1) L2=Small single turn,copper antenna 8cm x 4cm ,Ion detector 2(this one fixed in the wood box,behind the BFO coil). |
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