[en] The aim of the work is to show that optimal parameters of NbN film deposition can as well be determined by the dependence of coating deposition rate on the pressure of argon-nitrogen mixed gas. Characteristic dependences of coating deposition rate (V) on the working gas pressure, measured under niobium target sputtering in pure argon and in the mixture of Ar and 25% of N₂ are presented. The discharge power is kept at the level of 900 W. It is ascertained that under arbitrary choice of discharge power value and Ar-N₂ mixture composition comparison of V(P) dependences measured under Nb target sputtering in Ar mixture allows one to unambiguously determine the interval of the mixture pressures providing for the production of high-quality superconducting NbN films