Technician exam question T7A09
Subelement T7, PRACTICAL CIRCUITS· Group T7A
What is the function of the switch which selects either SSB or CW-FM on some VHF power amplifiers?
- A.Change the mode of the transmitted signal
- B.Set the amplifier for proper operation in the selected mode (correct answer)
- C.Change the frequency range of the amplifier to operate in the proper segment of the band
- D.Reduce the received signal noise
WhyThe switch on some VHF power amplifiers that selects SSB or CW-FM sets the amplifier for proper operation in the selected mode. An SSB/CW-FM mode switch on a VHF amplifier reconfigures its bias and operating point for the mode selected, since a linear amplifier for SSB needs different settings than one built for the constant-envelope signals of CW or FM, answer B. It doesn't change what mode is actually being transmitted (A, that's set at the transceiver), it doesn't retune the amplifier to a different frequency segment (C), and it has no effect on received signal noise (D).
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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