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  1. 4:1 VOLTAGE BALUN - VK6YSF

  2. Step-By-Step Construction of a 4:1 Current-Type Balun

  3. How to Buuild a 4:1 Current Balun - by KB1LQC - hamuniverse.com

  4. Build a 4:1 Guanella Current Balun Transformer - Q82.uk

  5. The Impedance-Transformation Properties of Common 4:1 Balun

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