All major credit cards accepted

Account Navigation

Account Navigation

Currency - All prices are in AUD

Currency - All prices are in AUD
 Loading... Please wait...
Balun Designs

Model 1118d - 400 KHz - 2 MHz, 5kW - Optimized for LW Frequencies


Model 1118d - 400 KHz - 2 MHz, 5kW - Optimized for LW Frequencies

Calculated at checkout

Product Description

Balun Designs is pleased to offer a specialized 1:1 balun to compliment the new Long Wave frequencies.   The material utilized for the two stacked cores is optimized for the LW band and provides exceptional choking impedance at these frequencies.  An isolation/choking impedance in exess of 10,000 ohms is developed at 1 MHz. Note the cores used for this balun are intended for use on the LW band ONLY and will not provide high level choking or isolation at higher frequencies.

Please go to the Accessories category for additional RF connector types and mounting options.

Testing shows SWR remains below 1.05 across the entire LW band, transformation is perfectly flat, return loss is between 72-89 dbmw and choking impedance is maximized at over 10k ohms on the LW frequencies. Please click on the graphs shown below to view the complete test results.

model-1118-scan-thumb.jpg model-1118-choking-thumb.jpg 
Click to Enlarge

Tests run utilizing AIM-4170uhf Network Analyzer and a precision non-inductive 50 ohm load




Noise Reduction

While the most common advice is to improve the station's RF ground, the root of the problem is in the poor isolation of the feedline from antenna currents. If your goal is to reduce feedline radiation and improve reception by reducing noise, feedline isolation baluns are an excellent choice. Adding an additonal isolation balun at the point where the feedline exits the near field area of the antenna will substantially reduce unwanted feedline radiation and reception of EMI without the need for improved station grounding. 


  Core Material   Custom mix ferrite by Fair Rite Products optimized for LW frequencies.
   Large 2.4 inch cores
  Winding Type   Stacked dual core, coaxial wound 1:1 current balun provides larger effective core area.
  Winding Material   Mil Spec 50 ohm coax rated 19kW @ 1MHz
  Silver flashed braid and center conductor with solid Teflon dielectric.
  Power Rating   400 KHz - 2 MHz - 5kW
  All ratings at resonance. High SWR will reduce power handling ability.
  Useable Frequency   400 KHz - 2 MHz
  Insertion Loss   Less than .02db
  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


Additional Information