We prove that a map between two realcompact spaces is skeletal if and only if it is homeomorphic to the limit map of a skeletal morphism between ω-spectra with surjective limit projections.
[1] Banakh T., Kucharski A., Martynenko M., On functors preserving skeletal maps and skeletally generated compacta, preprint available at http://arxiv.org/abs/1108.4197