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SESK: Stuff Everyone Should Know · sesk.info/hame-sar-meaning

What does SAR measure?

The rate RF energy is absorbed by the body.

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  1. The rate RF energy is absorbed by the body ✔
  2. Signal attenuation ratio
  3. The RF energy reflected from terrain

Why: SAR stands for specific absorption rate. It tells how much RF energy a person's tissue takes in, which is why handheld radios have SAR limits.

Huh, didn't know that: The high gain antennas used at microwave frequencies can create high exposure levels (E0A05).

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References

Answer: The rate RF energy is absorbed by the body. SAR stands for specific absorption rate. It tells how much RF energy a person's tissue takes in, which is why handheld radios have SAR limits.

  1. NCVEC 2024-2028 Amateur Extra Question Pool, 4th Errata (Feb 4, 2026) ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    C. The rate at which RF energy is absorbed by the body
    Checked 2026-10-11.

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