What is defined as an 'Emitter' in terms of electromagnetic radiation?

An 'Emitter' is defined as any equipment that emits electromagnetic radiation. This encompasses a wide variety of devices and systems, including radios, radar systems, and other communication technologies that transmit signals or data through electromagnetic waves. The key aspect of an emitter is its function of actively producing and sending out these electromagnetic signals, which can be detected by receivers designed to interpret the information carried by those waves.

In the context of electromagnetic communication and military operations, understanding what constitutes an emitter is crucial, as it can influence both the effectiveness of communication and the need for countermeasures against detection. Devices that operate in silence would not fall under this definition, as they do not emit radiation. Similarly, secure communication protocols and tactical signals pertain to methods or practices rather than physical equipment that generates electromagnetic emissions.