Electron injection break and pair content of quasar jets

We study the dependence of nonthermal radiation spectra in OVV quasars on the location of the low energy break in the electron/positron injection function. We show that the high energy spectra produced during outbursts are presumably superposed from two components, one resulting from Comptonization of emission lines, which dominates at MeV-GeV energies, and the other resulting from Comptonization of infrared radiation, which dominates in the X-ray band.