Technician exam question T7C05
Subelement T7, PRACTICAL CIRCUITS· Group T7C
Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?
- A.To protect the RF output amplifier transistors (correct answer)
- B.To comply with FCC rules on spectral purity
- C.Because power supplies cannot supply enough current at high SWR
- D.To lower the SWR on the transmission line
WhyMost solid-state transmitters reduce output power as SWR increases beyond a certain level to protect the RF output amplifier transistors. Reflected power from a high SWR condition can stress and overheat a solid-state amplifier's output transistors, so most transceivers automatically fold back power as SWR rises to protect that hardware, answer A. It isn't an FCC spectral-purity requirement (B), power supplies generally can still deliver current regardless of SWR (C), and reducing output power doesn't by itself change the SWR on the line (D), that's a function of the antenna match, not the transmitter's power level.
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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