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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is the RST System?

Learn how the RST signal reporting system works and how amateur radio operators use it during CW and digital contacts.

Getting Started HF Fundamentals Reviewed 2026-07-14
Short Answer: Learn how the RST signal reporting system works and how amateur radio operators use it during CW and digital contacts.

Explanation

Overview The RST System is the standard method used by amateur radio operators to report received signal quality during CW contacts. Some digital mode operators also exchange simplified RST reports where appropriate. RST stands for: R = Readability S = Signal Strength T = Tone Readability Scale 1 = Unreadable. 5 = Perfectly readable. Signal Strength Scale 1 = Barely detectable. 9 = Extremely strong. Tone Scale 1 = Very poor tone. 9 = Pure, stable tone. Example An RST report of 599 means: Readability: 5 (Perfect) Signal Strength: 9 (Very Strong) Tone: 9 (Excellent) Applied to Chameleon Products RST reports provide valuable on-air feedback when evaluating the performance of Chameleon antenna systems under different propagation and installation conditions. Related Articles What Is a Signal Report? What Is CW? What Is DXing? What Is a CQ Call? Related Products All Chameleon Antenna Systems

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.