RFI - Radio Frequency Interference

RFI – Radio Frequency Interference

The RFI section is dedicated to one of the most frustrating challenges in modern ham radio: noise. From solar inverters and switching supplies to Ethernet cables and lawn mowers, interference sources are everywhere. These articles provide practical tools to identify, measure, and mitigate RFI at your station. Expect deep technical dives into common-mode, differential noise, and coupling paths, all supported by real measurements and EMC principles. Every article is datestamped so you can track freshness and updates.

• [2025-08-10] Hidden Noise Machines: Understanding EMC in Everyday Electronics [NL]
• [2025-08-02] EMC Nightmare: When Solar Inverters Become Illegal Transmitters [NL]
• [2025-07-22] When Your Lawn Mower Becomes an Interference Source: EMC Warnings for RF Enthusiasts
• [2025-07-16] Common-Mode Noise on 2m: How to Detect and Eliminate It
• [2025-07-09] Understanding Near-Field, Far-Field, and RFI/EMC in Ham Radio 160m–2m
• [2025-07-06] Reducing RF Interference from Solar Panels: How to Mitigate Noise on Your Beam Antenna
• [2025-06-28] Understanding Differential Noise in Solar Inverter Systems
• [2025-06-19] Non-Resonant Passive RX Antennas and Common Mode: Why It Still Matters
• [2025-06-11] Non-Resonant TX Antennas in RX Mode: The Hidden Noise Problem
• [2025-05-31] Understanding Common Mode Buildup and the Need for Multiple Chokes
• [2025-05-22] Diplexers and Common Mode: The Hidden Coupling Path
• [2025-05-09] Where Does the Noise Come From?
• [2025-04-27] Same-Spaced RFI Across Multiple Bands? It’s Probably Common Mode
• [2025-04-14] When Does CAT5 Start to Radiate?
• [2025-03-30] Differential Noise from Raspberry Pi, Arduino Detection and Mitigation