Krick, W.W.Krick2022-03-022022-03-021980https://publica.fraunhofer.de/handle/publica/169492For future development multichannel CATV-transmission systems the utilization of phase-coherent picture carriers is discussed as a means of reducing intermodulation and crossmodulation-distortion arising in the line repeater amplifiers. The author presents experimental and theoretical data for comparison of transmission performance. As a basis, non-coherent operation is reviewed. In order to evaluate the improvement by a coherent system the problem of optimum carrier phase relation is investigated. Experimental results demonstrate the suppression of distortion, if the phases are adjusted according to a certain code which was found by optimization.encable televisioncommunity antenna televisionelectric distortionoptimum coherent carrier systemline repeater amplifierscatvcrossmodulation distortionphase coherent picture carriersintermodulation distortion621journal article