Extra exam question E4C01
Subelement E4, AMATEUR PRACTICES· Group E4C
What is an effect of excessive phase noise in an SDR receiver’s master clock oscillator?
- A.It limits the receiver’s ability to receive strong signals
- B.It can affect the receiver’s frequency calibration
- C.It decreases the receiver’s third-order intercept point
- D.It can combine with strong signals on nearby frequencies to generate interference (correct answer)
WhyExcessive phase noise in an SDR receiver's master clock oscillator can combine with strong signals on nearby frequencies to generate interference. Excessive phase noise in an SDR's master clock oscillator spreads unwanted energy around every signal the receiver processes, and that spread noise can combine with a strong nearby signal to create interference, effectively a form of reciprocal mixing, that shows up on top of a desired weaker signal, answer D. It doesn't primarily limit strong-signal handling on its own, doesn't directly change frequency calibration, and doesn't specifically reduce third-order intercept point, those are separate receiver specifications.
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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