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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is Radio Frequency Interference (RFI)?

Learn what Radio Frequency Interference (RFI) is, what causes it, and how to reduce interference in amateur radio stations.

Troubleshooting RFI & EMC Reviewed 2026-07-14
Short Answer: Learn what Radio Frequency Interference (RFI) is, what causes it, and how to reduce interference in amateur radio stations.

Explanation

Overview Radio Frequency Interference (RFI) is unwanted radio frequency energy that disrupts the normal operation of radio receivers or electronic equipment. RFI may be generated by radio transmitters, electrical devices, switching power supplies, motors, LED lighting, solar power systems, or many other electronic products. Common Sources of RFI Switching power supplies. LED lighting. Solar inverters. Battery chargers. Electric motors. Computers and networking equipment. Poorly filtered electronic devices. Common Symptoms Increased receiver noise. Buzzing or clicking sounds. Television or audio interference. Computer malfunctions during transmission. Reduced receiver sensitivity. Reducing RFI Identify the interference source. Install ferrite chokes where appropriate. Improve station grounding and bonding. Use quality coaxial cable. Maintain proper antenna placement. Applied to Chameleon Products Proper installation of Chameleon antenna systems, including quality feed lines, appropriate common-mode chokes, and sound grounding practices, can help reduce unwanted RF currents that contribute to interference problems. Related Articles What Is Common-Mode Current? What Is a Common-Mode C

The exact result depends on the complete station: frequency, geometry, feed line, matching network, return-current path, environment, operating power, and the reference plane of any measurement. A low SWR establishes an impedance relationship at that point; it does not by itself prove efficiency, radiation pattern, compatibility, or safety.

What to Verify

  • Use the newest official product guide or primary service documentation.
  • Confirm the exact model, revision, components, configuration, and operating conditions.
  • Begin tests at low power and change one variable at a time.
  • Do not infer compatibility from connector or thread fit.

Learn Next

  • Antenna Selection: A Mission-First Decision Guide
  • Engineering Design Tradeoffs in Portable HF Antennas
  • Antenna Measurement Reference Planes
  • Understanding Common-Mode Current

Source note: Independently synthesized with reference to The ARRL Handbook for Radio Communications, 99th edition (2022), and The ARRL Antenna Book for Radio Communications, 24th edition (2019). Verify changing regulations, services, software, specifications, availability, and safety requirements against current primary sources.