General exam question G4C02
Subelement G4, AMATEUR RADIO PRACTICES· Group G4C
Which of the following could be a cause of interference covering a wide range of frequencies?
- A.Not using a balun or line isolator to feed balanced antennas
- B.Lack of rectification of the transmitter’s signal in power conductors
- C.Arcing at a poor electrical connection (correct answer)
- D.Using a balun to feed an unbalanced antenna
WhyArcing at a poor electrical connection can cause interference covering a wide range of frequencies. Arcing at a poor or corroded electrical connection generates a broadband train of impulses that spans a wide range of frequencies, which is why it's a classic source of interference heard across many bands at once, answer C. A missing balun, unrectified conductors, or a balun feeding an unbalanced antenna are mismatched or configuration issues, not broadband noise generators.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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