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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is a 1:1 Balun?

Learn what a 1:1 balun is, how it works, and when it should be used with amateur radio antennas.

Feed Lines & RF Components Matching & Isolation Devices Reviewed 2026-07-14
Short Answer: Learn what a 1:1 balun is, how it works, and when it should be used with amateur radio antennas.

Explanation

Overview A 1:1 balun is a balanced-to-unbalanced device that does not change impedance . Instead, it provides a balanced connection between an antenna and an unbalanced transmission line while helping suppress unwanted common-mode current. Its primary purpose is to improve current balance and prevent the outside of the coaxial cable from becoming part of the antenna system. Primary Functions Balanced-to-unbalanced conversion. No impedance transformation. Reduces common-mode current. Improves radiation pattern symmetry. Helps reduce RF in the station. Typical Applications Resonant dipoles. Yagi antennas. Quad antennas. Loop antennas. Balanced feed-point antennas. Benefits Cleaner radiation pattern. Reduced feed-line radiation. Lower received noise. More stable SWR measurements. Applied to Chameleon Products A 1:1 current balun or common-mode choke is recommended with several Chameleon antenna installations to minimize feed-line radiation and improve overall station performance. Related Articles What Is a Balun? What Is Common-Mode Current? What Is Feed-Line Radiation? What Is a Current Balun vs a Voltage Balun? Related Products Selected Chameleon Matching Devices

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.