Before revision: An example home made spectrum analyser using harmonic mixer techniques Usage Subharmonic mixers are often used in direct-digital, or zero IF, communications system in order to eliminate the unwanted effects of LO self-mixing which occurs in many fundamental frequency mixers.
After revision: An example home made spectrum analyser using harmonic mixer techniques ==Usage== Subharmonic mixers are often used in direct-digital, or zero IF, communications system in order to eliminate the unwanted effects of LO self-mixing which occurs in many fundamental frequency mixers.