As someone who enjoys both the technical and practical sides of amateur radio, building 49:1 transformers for End-Fed Half-Wave (EFHW) antennas is something I take seriously. Each transformer I sell, whether on my Etsy store or at hamfests, is built by hand, with careful attention to detail.
The Build Process
Each transformer starts with a ferrite core, and I hand-wind the magnet wire around it to achieve the right balance for a 49:1 match. This process isn’t rushed. It’s about ensuring that each turn of the wire is tight and even. The goal is to minimize signal loss and ensure smooth operation when the transformer is in use with an EFHW antenna.
After winding, the core is connected to durable components, like BNC connectors. I choose parts that can withstand regular outdoor use, as many hams take their gear into the field for portable operations like POTA or SOTA. Once the assembly is complete, I test each transformer with an SWR meter to make sure it's ready for the bands it’s designed to cover.
Hand-Built with Care
I build my transformers in small batches, ensuring that they work well in real-world settings. The process takes time, but it’s worth it to know that what I’m offering to fellow hams is reliable and effective. From the first winding to the final test, the focus is on quality.
A Practical Approach
I started building these transformers because I wanted something I could rely on in the field, and I figured other hams might feel the same way. When you operate QRP or portable, you need gear that’s lightweight, compact, and dependable. That’s what these transformers are designed to deliver.
