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I want to share the way of harmonizing EMF with the low-impedance load coils, as shown in the figure. Coils L1 and L2 can take the ready - broadcast receivers with the if 465 kHz with contour capacitance of 500 pF.
The input impedance thus obtained, depending on the position of the core, from 75 to 300 Ohm.
Author: V. Zhuravsky (ER4OT), Moldova, Soroka; Publication: N. Bolshakov, rf.atnn.ru