This code describes the functions necessary for fitting a joint Modified Black Body function (MBB) describing the cold dust from the host galaxy of a quasar, and the power-law from the synchrotron emission of the jet assuming different scenarios for the frequency break in the power-law. The steepening of the synchrotron spectrum can follow a continuous injection (CI) of electrons after the jet shocks with the interstellar medium (ISM), as described in Heavens & Meisenheimer (1987). Similarly, a break in the spectrum assuming a "one-shot" injection of electrons from the KP model ( Kardashev (1962), and Pacholczyk (1970)).