Dual Core 4:1 Current Balun 5kW 1 - 54MHz  #4115
Dual Core 4:1 Current Balun 5kW 1 - 54MHz #4115
4115 Alternate View 1
4115 Alternate View 2
4115 Alternate View 3

Dual Core 4:1 Current Balun 5kW 1 - 54MHz #4115

Manufacturer: Balun Designs
SKU: 4115
Price: $94.95
$96.95 Model 4115et - Eyebolts on Sides & Top
$96.00 Model 4115e - Eyebolts on Sides
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This is a balun originally designed by Guanella and subsequently improved by Dr. Jerry Sevick (W2FMI). By utilizing Thermaleze wire inserted in teflon tubes, Dr. Sevick was able to substantially increase the breakdown voltage between both conductors and windings while maintaining the required 100 ohm characteristic impedance. The dual cores also provide excellent choking impedance and feedline isolation. Consequently, this balun is a good choice if you have RFI problems or RF in your shack due to imbalanced ladder line.

Please review the scans below to appreciate the excellent specs this balun offers.

Click to Enlarge

All testing done with an AIM-4170c Network Analyzer and precision 200 ohm load 


If one or both legs of your antenna will be installed over or close to (< 20 feet) your house, a large structure (garage, barn, etc) or near (< 30 feet) a metal roof/structure and you will run 700+ watts DO NOT use this 4115 balun.  The interaction/coupling of the antenna with the structure and or metal will create excessive flux in one core and subsequent damage to the balun. Instead use the Model 4114 which utilizes a single stacked core designed to handle the imbalance caused by any interaction or coupling.

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