Residual dipolar coupling between quadrupolar and other nuclei under MAS has not usually been thought to be important in high field NMR spectroscopy. We show that coupling to N-14 broadens H-1 lineshapes significantly even at 11.7 T, and that we can decouple N-14 from H-1 during H-1 homonuclear decoupling to successfully improve H-1 resolution. The method used for decoupling is the application of evenly spaced pulses to the quadrupolar nucleus. (c) 2008 Elsevier B.V. All rights reserved.