Technician exam question T8B07
Subelement T8, SIGNALS AND EMISSIONS· Group T8B
What is Doppler shift in reference to satellite communications?
- A.A change in the satellite orbit
- B.A mode where the satellite receives signals on one band and transmits on another
- C.An observed change in signal frequency caused by relative motion between the satellite and Earth station (correct answer)
- D.A special digital communications mode for some satellites
WhyDoppler shift in satellite communications is an observed change in signal frequency caused by relative motion between the satellite and Earth station. Doppler shift is the change in a signal's observed frequency caused by the relative motion between a satellite and a ground station as the satellite moves through its pass, answer C. It isn't a change in the orbit itself (A), a description of dual-band operation (B), or a special digital mode (D), those are unrelated satellite concepts.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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