What is crossmodulation?
Crossmodulation or XMOD is third order distortion product which transfers the modulation of one carrier to another carrier. Crossmodulation is defined as the ratio of the residual modulation on a carrier compared to the modulation of the carrier at 100% modulation. On a TV picture crossmodulation may appear as a faint image from another channel. This is not to be confused with an image from a distant station at the same frequency as the desired channel.