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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is a Coax Switch?

Learn what a coax switch is and how it safely routes RF signals between radios, antennas, and station accessories.

Getting Started HF Fundamentals Reviewed 2026-07-14
Short Answer: Learn what a coax switch is and how it safely routes RF signals between radios, antennas, and station accessories.

Explanation

Overview A coax switch is a mechanical or electronic device that routes RF signals between coaxial cables. In amateur radio, coax switches are commonly used to connect one radio to multiple antennas or multiple radios to a single antenna. Common Configurations One radio to multiple antennas. Multiple radios to one antenna. Antenna to dummy load. Antenna analyzer selection. Important Characteristics Low insertion loss. High isolation. 50-ohm impedance. Appropriate power rating. Safety Considerations Verify switch position before transmitting. Never exceed the switch's power rating. Inspect connectors regularly. Label switch positions clearly. Applied to Chameleon Products Coax switches simplify stations that use multiple Chameleon antennas by allowing quick selection of the appropriate antenna for the desired operating band or application. Related Articles What Is an Antenna Switch? What Is a Dummy Load? What Is Coaxial Cable? What Is SWR? Related Products All Chameleon Antennas

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.