50:600 ohm, (12:1) CUBE™ Balun/Unun, 1-31 MHz Balun, 1KW/2KW
12:1 Baluns are useful between 600-650 ohm balanced loads the impedance at the end of the feed line is 600 ohms (1/2 wavelength feed line), or high impedance feeds for rhombic, T2FD and traveling wave antennas.
12:1 Ununs are useful between coax and long wires with a load impedance near 600 ohms like a beverage antenna. Shortwave listener antennas also can benefit with the 12:1 unun and it may provide a better match than 9:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier.
CB-12-1000 1KW PEP 1-31 MHz Balun
Conversion graph for 1-31 MHz: