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Slaying Power Line Interference

Presented by Gary Bishop, NQ0V, and Dan Fisher, AI4GK, at Hamvention 2025. The presenter dives deep into the world of power line interference, showcasing the real-world challenges radio amateurs face when trying to operate in noisy environments. Drawing from experience in Central Florida, where lightning strikes are frequent and solar installations are growing, the presentation covers the tools and techniques used to identify and resolve RF interference. With hands-on demonstrations, the presenter explains how simple AM radios, directional antennas, and low-cost gear can pinpoint noisy power line components, loose hardware, and faulty solar setups. Emphasis is placed on the 120 Hz signature of power line noise, why lightning arresters fail, and how switching mode power supplies add to the RF pollution. The talk also explores practical strategies for working with power companies, building effective reports, and knowing when and how to escalate issues. The presenter explains the value of establishing relationships with utility technicians, how to leverage ARRL resources, and the importance of persistence. Examples are shared of successfully resolved cases and the frustrations when cooperation stalls. For those without local RFI teams, advice is given on building your own response using homemade equipment and community support. Whether you're a seasoned ham or just starting out, this session offers actionable insight into tackling one of HF radio’s most frustrating problems.