The resonant compressor of microwave pulses contains an overmoded cavity with an overmoded output waveguide. The commutator is a bandpass filter formed of a chain of transmission-type (reentrant) cavities. The basic results of the experiments carried out at low and high power levels and a block diagram of the experimental setup are presented. The compressor has the following performance characteristics: (1) an operating radio frequency of 9.16 GHz, (2) a power gain of 16.3 dB, and (3) the duration of the output pulses is 2 ns. The latter figure ensures the minimum energy output time