SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/hamg-g6b04

About what is the typical upper frequency limit for low-SWR use of a 50-ohm BNC connector?

About 4 GHz.

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  1. 500 MHz
  2. 4 GHz ✔
  3. 40 GHz

Why: A 50-ohm BNC connector keeps a low SWR up to roughly 4 GHz. That covers HF, VHF, UHF and into the lower microwave range.

Huh, didn't know that: An RCA phono connector is commonly used for low-frequency or DC signal connections to a transceiver.

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References

Answer: 4 GHz. A 50-ohm BNC connector keeps a low SWR up to roughly 4 GHz. That covers HF, VHF, UHF and into the lower microwave range.

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    4 GHz
    Checked 2026-10-11.

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