  Using self-consistent cosmological simulations of disc galaxy formation, we
analyse the 1.4 GHz radio flux from high-redshift progenitors of present-day
normal spirals within the context of present-day and planned next-generation
observational facilities. We demonstrate that while current radio facilities
such as the Very Large Array (VLA) are unlikely to trace these progenitors
beyond redshifts z<0.2, future facilities such as the Square Kilometer Array
(SKA) will readily probe their characteristics to redshifts z<2, and are likely
to provide detections beyond z~3. We also demonstrate that the progenitors of
present-day cD galaxies can emit in excess of 10 uJy of flux at redshifts z>1,
and may be a non-negligible contributor to the micro-Jansky source counts
derived from current deep VLA cm-wave surveys.
