2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/133569Uncertainty principles for concentration of signals into truncated subspaces are considered. The ``classic'' uncertainty principle is explored as a special case of a more general operator framework. The time-bandwidth concentration problem is shown as a similar special case. A spatial concentration of radio signals example is provided, and it is shown that an uncertainty principle exists for concentration of single-frequency signals for regions in space. We show that the uncertainty is related to the volumes of the spatial regions.5 pages, 1 figure, Australian Communications Theory Workshop 2006Information Theorytext