General exam question G8B11
Subelement G8, SIGNALS AND EMISSIONS· Group G8B
What combination of a mixer’s Local Oscillator (LO) and RF input frequencies is found in the output?
- A.The ratio
- B.The average
- C.The sum and difference (correct answer)
- D.The arithmetic product
WhyA mixer's output contains the sum and difference of the Local Oscillator and RF input frequencies. A mixer's nonlinear operation combines the local oscillator and RF input frequencies to produce new output components at both their sum and their difference, one of which is typically selected as the intermediate frequency, answer C. The output isn't simply their ratio, their average, or their arithmetic product, those don't describe how mixer nonlinearity actually generates new frequency components.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- G8B01Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)?
- G8B02What is the term for interference from a signal at twice the IF frequency from the desired signal?
- G8B03What is another term for the mixing of two RF signals?
- G8B04What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
- G8B05Which intermodulation products are closest to the original signal frequencies?