  We solve the Bethe-Salpeter equation for a system of a heavy quark-antiquark
pair interacting with a screened linear confining potential. First we show the
spinless QFT model is inadequate and fail to describe even gross feature of the
quarkonia spectrum. In order to get reliable description the spine degrees of
freedom has to be considered. Within the approximation employed we reasonably
reproduce known radial excitation of vector charmonium. The BSE favors
relatively large string breaking scale $\mu\simeq 350MeV$ . Using free charm
quark propagators we observe that $J/\Psi$ is the only charmonium left bellow
naive quark-antiquark threshold $2m_c$, while the all excited states are
situated above this threshold. Within the numerical method we overcome
obstacles related with threshold singularity and discuss the consequences of
the use of free propagators for calculation of excited states above the
threshold.
