[en] The rf equipment constructed for the IPNS-I accelerator system, formerly called the Zero Gradient Synchrotron (ZGS) Booster II, is described in this report. The accelerator is a first harmonic rapid cycling machine intended to accelerate 3 x 10¹² protons from 50 MeV to 500 MeV, 30 times per second. The rf system produces a peak accelerating voltage of 22 kV over a 2.2 MHz to 5.3 MHz frequency band. Two single gap ferrite loaded cavities are located 180⁰ around the accelerator and operated 180⁰ out of phase to provide the desired voltage. High level equipment, low level subsystems and control equipment are covered as well as modifications incorporated after start-up