Model 4125 - 4:1 Tuner Balun 1.5 - 54 MHz 5kW

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  • Model 4125 - 4:1 Tuner Balun 1.5 - 54 MHz 5kW
  • Model 4125 - 4:1 Tuner Balun 1.5 - 54 MHz 5kW
  • Model 4125 - 4:1 Tuner Balun 1.5 - 54 MHz 5kW
  • Model 4125 - 4:1 Tuner Balun 1.5 - 54 MHz 5kW

Vacation Closure until Aug 4th


Heavy duty 4:1 tuner balun utilizing stacked cores to provide a very high power rating across all HF frequencies.  Constructed using our enhanced design with Teflon tubing over heavy build Thermaleze insulated wire.

If you are building a true windom (sometimes called a Carolina Windom) with a vertical coaxial radiator (not an OCF dipole) or need to replace the 4:1 balun at the center of an original windom, this balun is an excellent choice and will pass the RF signal to the vertical radiating coax. This model should NOT be used for the modern version Off Center Fed dipole that has no vertical coaxial radiator.  Instead, use the model 4116et or Model 4115ocf for best current balance and excellent RF choking impedance.



  Core Material   Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
   Large 2.4 inch cores are coated and sealed for long term durability.
  Winding Type   Stacked cores with single bifilar pair wound as 4:1 voltage balun.
  Winding Material   1 bifilar winding of 14 gauge Heavy build polyamideimide Allex 240 Winding Wire
  Windings are inserted into Teflon tubes increasing total breakdown to 10,000 volts.  
  Power Rating   1 to 35 MHz - 5kW, 7kW intermittent.  35 to 54 MHz - 3kW.  
  All ratings based on resonant load. High SWR will reduce power handling ability.
  Useable Frequency   1 to 54 MHz
  Insertion Loss   Less than 0.1db
  Connectors   SO-239 connectors are silver plated with Teflon insulation.
  Studs and eyebolts are 1/4 inch.
  Alternate connectors and Mounting Options are available in the Accessories section.
  Hardware   All Stainless Steel
  Enclosure Type
  NEMA rated 4x marine grade junction box for outdoor installations.
  Cover utilizes integral neoprene gasket for weatherproof integrity.
 Dimensions  4x4x2 inches for main body of unit
 Dimensional Drawing of Standard Enclosure
 Additional Info  Very high efficiency. 
 Will not heat up or saturate at like the "less expensive" designs.

Installation Notes


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