This page contains some balun / unun / impedance transformers which I have built. This page is still being built.
Impedance Matching
- End Fed Half Wave Antenna Coupler – Using a parallel tuned circuit to feed an end fed half wave antenna.
Current (choke) Baluns
- 1:1 Choke Balun – For use as a ‘tuner balun’ on the output of an unbalanced ATU for feeding a multiband doublet.
- 1:1 50Ω Choke Balun – Built with coax, to keep the impedance at 50Ω for feeding a coax fed half wave dipole.
Voltage Baluns
- 50 ohm 1:1 Balun – A simple 50Ω 1:1 voltage balun made from a ferrite core.
- 9:1 Magnetic Longwire Balun / Unun – A 9:1 impedance transformer for feeding end fed wires.