Balun Designs

The venerable 1:1 isolation/choke balun is the first of our new line of DIY kits.  All components are the same as those used in our pre-assembled units. This finished balun will have an SO-239...

This is an outstanding new addition to the Balun Designs line of common mode suppression baluns and was developed working in collaboration Fair Rite products, a major ferrite producer. The resulting...

The venerable 1:1 isolation/choke balun is the first of our new line of DIY kits.  All components are the same as those used in our ready made units. The completed balun will have an SO-239 for...

This Isolation balun is identical in design to the Model 1115d but with one key exception. The toroid material utilized for the two stacked cores is optimized for the lower HF bands and provides...

Our "i" series of feedline isolation baluns provide excellent feedline decoupling and, depending on the model selected, low loss performance across the full HF spectrum. The model...

After numerous requests, Balun Designs is pleased to offer a specialized 1:1 balun optimized for 6 meters.   The material for this core is optimized for 50-54 MHz and provides exceptional...

This is a unique 1:1 transmission line transformer intended to provide highest possible isolation between input and output.  Consequently there is no direct electrical connection...

This is a departure from the normal 1:1 isolation/choke balun and utilizes a bifilar pair designed to handle the high voltages created by multiband antennas such as doublets and multiband loops ...

This is a departure from the normal 1:1 isolation/choke balun and utilizes a bifilar pair designed to maximize inter winding breakdown voltage. This is a departure from the normal 1:1 isolation/choke...

This is a departure from the normal 1:1 isolation/choke balun and utilizes a bifilar pair designed to handle the high voltages typically found on multiband antennas such as doublets and multiband...

This is a unique design by Dr. Jerry Sevick (W2FMI) that combines a 25 ohm balun with a 1:2 unun for final transformation to 50 ohms. Used anywhere there is a need to transform 25 ohms...

22/25 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...