Add-on beat frequency oscillator (BFO) for shortwave radio

· Edn · July 28, 2026, 12:24 p.m.
design, Design Ideas analog Radio DIY Electronics Audio Engineering shortwave radio Radio Technology
Summary
This blog post discusses the idea of incorporating a beat frequency oscillator (BFO) into inexpensive shortwave radios, inspired by features found in more expensive models. It suggests a DIY approach for enhancing such radios.
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