RFI

Radio Frequency Interference – A special type of EMI (electromagnetic interference) that is specific to transmitted fields within the radio frequency band, typically over 1Mhz. Whereas EMI is a by-product of electrical devices, RFI is typically a deliberate signal transmission such as a radio station, TV, cordless phone, etc. Because RFI is a type of EMI, is can be just as detrimental to the signals in a wire and may need to be shielded against.