Extra exam question E4E06
Subelement E4, AMATEUR PRACTICES· Group E4E
What type of electrical interference can be caused by computer network equipment?
- A.A loud AC hum in the audio output of your station’s receiver
- B.A clicking noise at intervals of a few seconds
- C.The appearance of unstable modulated or unmodulated signals at specific frequencies (correct answer)
- D.A whining-type noise that continually pulses off and on
WhyComputer network equipment can cause interference that appears as unstable modulated or unmodulated signals at specific frequencies. Computer network equipment often causes interference that appears as unstable, modulated or unmodulated signals showing up at specific frequencies, tied to the clock and data-switching frequencies the equipment generates internally, answer C. A steady AC hum, periodic clicking, or a pulsing whine are the signatures of other, different kinds of electrical noise sources, not typically what network equipment produces.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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