KR4BAD is my amateur radio callsign — and this is my corner of the radio world focused on learning, building, and solving real RF problems.
This site is built for operators who want to understand why things work — not just follow instructions or plug in solutions. Whether you’re troubleshooting an antenna, exploring HF techniques, or building your own equipment, the goal here is simple: clear explanations, practical insight, and real-world results.
I take a no kits, no shortcuts approach. Every project is hands-on, every problem is worked through, and every lesson is earned at the bench.
At the center of this work is Freedom7 — a complete HF transceiver being built from scratch.
Freedom7 is both a build and an experiment. I document the entire process as it unfolds: design decisions, circuit behavior, failures, fixes, and breakthroughs. Nothing is hidden, and nothing is skipped.
If something doesn’t work, you’ll see it.
If something finally clicks, you’ll see that too.
If you’re interested in radio craftsmanship, problem-solving, and pushing beyond pre-built solutions, you’ll find plenty here to learn from — and maybe a few ideas to take back to your own shack.