Methods of measurement for radio transmitters; part 3: wanted and unwanted modulation; first supplement: appendices; second supplement: unwanted modulation, including hum and noise modulation

This standard outlines the technical methodologies for measuring modulation characteristics in radio transmitters, specifically addressing both necessary and spurious modulation types. It provides detailed procedures to evaluate unwanted signals that may interfere with signal integrity, including specific analyses of hum and noise modulation. The document serves as a technical reference for engineering applications by defining measurement parameters and test conditions required to assess transmitter performance. It focuses on the quantification of distortion products and incidental modulation components that arise during operation. The content is organized to facilitate consistent testing across different manufacturing and operational environments. It establishes a framework for identifying and characterizing modulation anomalies that deviate from intended signal transmission. The scope covers the procedural aspects of measurement without prescribing specific equipment models or operational limits. This reference supports the development of reliable communication systems by ensuring that transmitters adhere to defined modulation quality benchmarks. The guidelines presented assist engineers in diagnosing signal quality issues related to unintended modulation effects.