Extra exam question E4D11
Subelement E4, AMATEUR PRACTICES· Group E4D
Why are odd-order intermodulation products, created within a receiver, of particular interest compared to other products?
- A.Odd-order products of two signals in the band being received are also likely to be within the band (correct answer)
- B.Odd-order products are more likely to overload the IF filters
- C.Odd-order products are an indication of poor image rejection
- D.Odd-order intermodulation produces three products for every input signal within the band of interest
WhyOdd-order intermodulation products draw particular concern because products generated from two in-band signals also tend to fall within that same band. Odd-order intermodulation products, particularly third-order ones, are of special concern because when they're generated from two signals that are both inside the band being received, the resulting products also tend to fall inside that same band, right where they can interfere with wanted signals, unlike even-order products which typically land well outside the band, answer A. They're not specifically about overloading IF filters, aren't an image-rejection indicator, and third-order intermodulation actually produces two dominant nearby products per pair of input signals, not three.
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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