A microwave generating system includes a modular architecture which is configurable to provide power output from under 1-kilowatt to over 100-kilowatts. The various power levels are achieved by combining the RF outputs of multiple RF power amplifiers in a corporate structure. The system can be used on any ISM band. Each system component incorporates a dedicated embedded microcontroller for high performance real-time control response. The components are connected to a high speed digital data bus, and are commanded and supervised by a control program running on a host computer.