A new approach to markedly reduce rf power for observed nuclei during H-1-homonuclear decoupled cross-polarization is described. The reduction of rf power to satisfy the Hartmann-Hahn matching condition for observed nuclei and homonuclear dipolar decoupling at H-1 nuclei were achieved simultaneously based on 'time averaging' of nutation frequency of H-1 nuclei by frequency switched Lee-Goldburg decoupling with unequal duration times for +/-LG irradiations. The rf nutation frequency and rf field for observed nuclei were shown experimentally to be reduced by factor 3 and 10, respectively, at C-13-NMR signals of MBBA in the liquid crystalline state. (C) 2003 Elsevier B.V. All rights reserved.