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Table 1 Single induction coil values

From: A new portable ELF Schumann resonance receiver: design and detailed analysis of the antenna and the analog front-end

Geometrical parameter Value
(lcore): length of the ferromagnetic core (mumetal) 300 mm
(dcore): diameter of the ferromagnetic core (mumetal) 25 mm
(dwire): diameter of the wire 0.25 mm
(lwinding): length of the coil 250 mm
(t): thickness of the coil winding 11 mm
(dtotal): diameter of the induction coil 47 mm
(n): number of turns 40,000
(μ) 66
Weight 2.2 kg