  We perform a series of so-called ``synthetic observations'' on a set of 3D
MHD jet simulations which explicitly include energy-dependent transport of
relativistic electrons, as described in the companion paper by Jones,
Tregillis, & Ryu. Analyzing them in light of the complex source dynamics and
energetic particle distributions described in that paper, we find that the
standard model for radiative aging in radio galaxies does not always adequately
reflect the detailed source structure.
