Model 15133 - 1.5:1 Unun (75 to 50 ohms) 3kW

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  • Model 15133 - 1.5:1 Unun  (75 to 50 ohms)  3kW
  • Model 15133 - 1.5:1 Unun  (75 to 50 ohms)  3kW


75 ohms unbalanced to 50 Ohms unbalanced

Unlike Baluns, Unun's (unbalanced to unbalanced) provide impedance transformation for antennas that are naturally unbalanced because of their design configuration. Even though the unun's appear small is size, they are able to handle very high power (3kW continuous - matched/resonant condition) because of their excellent efficiency. This ratio is primarily designed to match unbalanced 75 ohm loads to 50 ohm coax feedlines.

Other unun ratios are available by contacting us via the methods shown in the About Us section.


  Core Material   Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
  Core is coated and sealed for long term durability.
  Winding Type   Individual core wound with trifilar set configured as 1.5:1 unun.
  Winding Material   14 gauge Superior 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 35 MHz - 3kW
  Useable Frequency   1.5 to 35 MHz
  Insertion Loss   Less than 0.1db
  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
  Studs are 1/4 inch
  Enclosure Type   NEMA rated 4x marine grade junction box for outdoor installations.
  Cover utilizes integral neoprene gasket for weatherproof integrity.

  4x4x2 inches for main body of unit
  Dimensional Drawing of Standard Enclosure

  Additional Info   Very high efficiency (98-99%)

Installation Notes

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