4:1 UN-UN Transformer for End-Fed Antennas

4:1 UN-UN Transformer for End-Fed Antennas: Learn how to build a 4:1 UN-UN transformer Construction and Working - using a T200-2 toroid for end-fed and long wire HF antennas with clear wiring explanation.

A 4:1 UN-UN (Unbalanced-to-Unbalanced) transformer is a versatile impedance-matching device used in many different antenna systems, not just end-fed wires. The diagram above shows a classic broadband design using a T200-2 toroidal core with bifilar winding, suitable for a wide range of HF antenna applications.