The RadioWavz 4:1 Ferrite Voltage BALUN is a Ruthroff 4:1 voltage BALUN has become a very popular BALUN, and can be used with both floating and symmetrical loads without modification. Designed to handle full legal power with a low standing
wave radio (SWR). It has 4 to 1 impedance ratio. The Ferrite core provides for a more efficient transformation. Frequency Coverage: 1.8 to 50 MHz. Good for matching a 200ohm load to a 50ohm source, or 300 ohm load to a 75ohm source.