Model 2113 - 2:1 Balun (100 to 50 ohms) 1.5 - 54 MHz - 3kW

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Available for order Saturday December 11th - 9am Central time

Excellent broadband balun that can be used anywhere there is a need to transform 100 ohms balanced to 50 ohms unbalanced. Its most common use is at the feedpoint of quads and mono band loops allowing the elimination of matching networks.  This is a two stage unit with a 100 ohm balun wound on a large toroid for RF choking and balanced to unbalanced conversion.  The output of the balun is then fed into a second stage which is a 2:1 unun to provide impedance reduction to 50 ohm unbalanced feedline.

This balun is intended for use with monoband antennas at 100 ohms. If used in multiband operation, core saturation and possible failure can occur at high power levels.


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Tests performed with AIM-4170uhf Network Analyzer and precision 200 ohm non inductive load.



  Core Material   Custom mix low permeability ferrites by Fair Rite Products for maximum bandwidth.
  Cores are coated and sealed for long term durability.
  Winding Type Two separately wound large toroids. First is 1:1 balun at 100 ohms. Winding is 14 gauge Thermaleze wire inserted in teflon tubes to achieve the characteristic impedance of 100 ohms. Second large core is trifilar wind of thermaleze wire creating a 2:1 Unun providing the impedance transformation from 100 ohms to 50 ohms unbalanced. 
  Winding Material   Essex heavy build polyamideimide Allex 240 Winding Wire 
  Windings are inserted into Teflon tubes increasing total breakdown to >10,000 volts.
  Power Rating   1.5 to 54 MHz - 3kW continuous.
  All ratings based on resonant load. High SWR will reduce power handling ability.
  Useable Frequency   1.5 to 54 MHz
  Insertion Loss   Less than 0.09db
  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

Installation Notes