Discussion
A receiver produces a whistle that changes pitch as it is tuned, near one particular station.
The most likely cause is
Answer: A
A tuneable whistle is the signature of two carriers beating together, which happens when an image or an adjacent-channel signal reaches the mixer and produces an audible difference frequency. Better preselection or a different intermediate frequency is the cure. De-emphasis belongs to FM. Diagonal clipping distorts the envelope without producing a tone. And over-modulation splatters rather than whistles. Interference diagnostics turn on whether the artefact tunes with the dial.
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