Radio System Noise Suppression Measurements

Ford Motor Company is pursuing quantitative techniques in the identification and resolution of entertainment system electromagnetic interference (EMI). A radio frequency (RF) anechoic chamber provides shielding from external electromagnetic noise sources and minimizes measurement errors due to voltage standing waves in the room at high frequencies. Computerized radio frequency measuring equipment provides reports summarizing vehicle radiated emission data, tests data relative to radio system RF noise tolerance limits and documents emission attenuation following addition of EMI shielding and/or filtering.