Factors Determining Interference

Each power circuit has certain distinguishing characteristics of its line and connected apparatus, such as generators, transformers, and loads. These determine the influence factor. Similarly, each telephone circuit has special features, and these determine its responsive-ness to the electric and magnetic fields from the power line, and the susceptiveness factor. Also, each parallel has individual characteristics, such as distance between the power and telephone lines and length of parallel. These determine the coupling factor. It is emphasized that these factors and the discussions that follow are general in nature; they apply to electrical noise pickup by a radio or sound system.