With frequency mixers in radios they multiply frequencies to create an intermediate frequency, but where in the wave are those? Every picture I’ve seen makes the two original signals look pretty obvious, but I don’t get where the sum and the difference are.
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The sun and difference signals (and sometimes one or both of the inputs) exist within the output. It isn’t a clean sinusoid, so that’s why the waves aren’t drawn. It’s typically drawn in frequency space instead
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