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