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Balun Designs

Model 1115u-u - 1:1 Balun 1.5 - 54 MHz 5kW


Model 1115u-u - 1:1 Balun 1.5 - 54 MHz 5kW

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Product Description

Custom built to replace the balun used on the MA5B yagi.  Antenna side of the balun has dual SO-239 connectors for connection to the jumper leads of the antenna.  Windings of Mil Spec coax allows this balun to provide a very high power rating across all HF frequencies, creates windings that have extremely uniform impedance for near perfect transformation and very high choking/isolation impedance.  By utilizing one of our optional SSC2 mounts in Accessories, the balun can be securely installed on the MA5B boom for easy replacement of the old balun.

This balun is more than just high power. Tests show SWR is below 1.06 across the entire HF band, transformation is perfectly flat, return loss is typically 60-75 dbmw and choking impedance peaks at over 5k ohms. Please click on the graphs shown below to view the complete test results.

Click to Enlarge

Tests completed utilizing AIM-4170c Network Analyzer and precision 50 ohm non inductive load 


  Core Material   Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
   Large 2.4 inch core is coated and sealed for long term durability.
  Winding Type   Single core, coaxial wound 1:1 current balun
  Winding Material   Mil Spec 50 ohm coax rated 19kW @ 1MHz, 9kW @ 10 Mhz and 4kW @50MHz. 
  Silver flashed braid and center conductor with solid Teflon dielectric.
  Power Rating   1 to 35 MHz - 5kW,  35 to 54 MHz - 4kW.
   All ratings CCW into resonant antenna.
  Useable Frequency   1 to 54 MHz
  Insertion Loss   Less than .02db
  Connectors   SO-239 connectors are gold center conductor with Teflon insulation.
  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