  Recent advances in estimating black hole masses for AGN show that radio luminosity is dependent on black hole mass and accretion rate. In this paper we outline a possible scheme for unifying radio-quiet and radio-loud AGN. We take the ``optimistic'' view that the mass and spin of the central black hole, the accretion rate onto it, plus orientation and a weak environmental dependence, fully determine the observed properties of AGN. 
The production mechanism of radio jets in AGN and quasar grand   unification