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1-30 MHz Balun Kit NXO-100 Toroid ring configurable for 1:1 1:4 and 1:9
Unun 9:1 ferrite

1 49 Balun

9 1 Unun Schematic

PD7MAA HOMEPAGE: Multiband end fed antennas 3.5 - 30mHz

49:1 Impedance Transformer for EFHW Antenna | DX Explorer | Antenna

Rincondelasbellezas: Four Nine Design

Arduino Uno Schematic (Colour) – Embedded Electronics Blog