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Balun Designs

Model 4116ocf - 4:1 Hybrid Balun 1.5 - 54MHz 3kW


Model 4116ocf - 4:1 Hybrid Balun 1.5 - 54MHz 3kW

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Product Description

For those who would like the combination of a 4:1 balun capable of tolerating almost any type of Off Center Fed installation and still provide the highest possible level of performance, the model 4116ocf is the solution. As the title indicates, this balun is a hybrid combination of a 4:1 voltage balun and our model 1115, 1:1 current balun.  If you look closely at the image, you can see the coaxial wound 1:1 current balun underneath the voltage balun stacked above it.

By utilizing a voltage balun in the first stage, the unit is able to handle any compromised or severely compromised installation while the 1:1 current still offers superior RF choking, feedline isolation and excellent current balance.  No matter if one or both antenna elements are over a roof line, next to large structures or close by to a large amount of metal, this balun can tolerate almost anything. Our beta testers have reported excellent performance even in some very unusual installations.

Only one application where this balun is not recommended. When building or replacing the balun at the feedpoint of a Carolina Windom that incorporates a vertical coaxial radiator, a voltage balun like our model 4125 should be used so RF will pass to the vertical radiator.  Please click on the thumbnail below to view the excellent characteristics of this hybrid balun.

Click to Enlarge
Testing done with an AIM-4170uhf Network Analyzer


  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   2 individual cores, first stage wound as 4:1 voltage balun, second as 1:1 current balun.
  Winding Material   2 bifilar windings of 14 gauge Heavy build polyamideimide Allex 240 Winding Wire
  in Teflon tubes then Mil Spec coax utilized for the 1:1 isolation/choke balun.  
  Power Rating   1.5 to 54 MHz - 3kW  
  All ratings based on resonant load. High SWR will reduce power handling ability.
  Useable Frequency   1.5 to 54 MHz
  Insertion Loss   Less than .03db
  Connectors   SO-239 connectors are gold center conductor 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 many of the "less expensive" designs.

Installation Notes