Radio frequency power amplifiers; microwave power amplifiers; microprocessor-based controllers for coordinating and supervising instruments used for electromagnetic compatibility testing; [ electronic noise emitters and ] low noise amplifiers for electromagnetic compatibility testing; antennas; [ test cells, namely, enclosures for use in testing electronic equipment and electronic components for electromagnetic compatibility; electric current conducting devices, namely, RF connectors;] RF directional couplers; RF power attenuators; RF impedance matching transformers; [ coaxial cables; ] electromagnetic waveguides; adapters for connecting coaxial cables to waveguides; RF power meters; power sensors for use in RF power measurements; RF electric field generators; [ combination electromagnetic compatibility testing packages, each including a test cell and a radio frequency power amplifier;] electromagnetic field immunity and emissions testing software; radio frequency field probes, and stands [, clamps and fiberoptic cables for use with field probes ] ; electronic devices each consisting principally of a combiner and controller that enable plural radio frequency or microwave power amplifiers to operate together for increased power output; generators and test instruments for radio frequency conducted immunity testing [ ; and generators for generating transient electrical waves and test instruments for testing the responses of automotive equipment for conduction of such waves ]