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We describe a simple dynamical model for an underdamped Josephson junction array coupled to a resonant cavity. From numerical solutions of the model in one dimension, we find that ~i! current-voltage characteristics of the array have self-induced resonant steps ~SIRS!, ~ii ! at fixed disorder and coupling strength, the array locks into a coherent, periodic state above a critical number of active Josephson junctions, and ~iii ! whenNa active junctions are synchronized on an SIRS, the energy emitted into the resonant cavity is quadratic with Na . All three features are in agreement with a recent experiment @P. Barbara, A. B. Cawthorne, S. V. Shitov, and C. J. Lobb, Phys. Rev. Lett. 82, 1963~1999!#.

Erratum: Resonant-cavity-induced phase locking and voltage steps in a Josephson array [Phys. Rev. B63, 144522 (2001)]