SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-coax-loss-frequency

What happens to coaxial cable loss as signal frequency is increased?

The loss increases.

  1. The loss decreases
  2. The characteristic impedance increases
  3. The loss increases ✔

Why: Coax loses more power at higher frequencies. A cable that works fine on HF can waste much of your signal on UHF.

Huh, didn't know that: That is why hams often use thicker coax or hardline for UHF and microwave antennas.

The dad joke
Why did the coax hate going to high-frequency parties? It always left feeling drained.
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Sources

  1. NCVEC 2026-2030 Technician Question Pool (Feb 19, 2026 release) https://www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf

Test yourself in the game

Ham RadioWhich type of feed line has the lowest loss?Ham RadioWhat happens to power lost in a feed line?Ham RadioWhich of the following causes failure of coaxial cables?

That's stuff everyone should know.