  We study several parasitic effects on the implementation of a Josephson
radiation comb generator (JRCG) based on a dc superconducting quantum
interference device (SQUID) driven by an external magnetic field. This system
can be used as a radiation generator similarly to what is done in optics and
metrology, and allows one to generate up to several hundreds of harmonics of
the driving frequency. First we take into account how assuming a finite loop
geometrical inductance and junction capacitance in each SQUID may alter the
operation of this device. Then, we estimate the effect of imperfections in the
fabrication of an array of SQUIDs, which is an unavoidable source of errors in
practical situations. We show that the role of the junction capacitance is in
general negligible, whereas the geometrical inductance has a beneficial effect
on the performance of the device. The errors on the areas and junction
resistance asymmetries may deteriorate the performance, but their effect can be
limited up to a large extent with a suitable choice of fabrication parameters.
