The author investigated the C-13-N-14 rotational echo double resonance (REDOR) NMR experiment performed with a frequency-sweep N-14 overtone pulse. The computer simulations of the experiment for powdered N-acetyl-D,L-valine were carried out. It was found from the simulations that, in a slow spinning region, C-13 diminished echo intensities remained invariant even when the center frequency of the frequency-sweep range was shifted a few tens of kHz. As a result, it became apparent that the REDOR experiment employing the frequency-sweep pulse had the adequate ability to determine the heteronuclear dipolar interaction for a C-13-N-14 spin system in solids. (C) 2003 Elsevier B.V. All rights reserved.