Radio noise is something that crops up often in the field of paranormal research, most often referred to as "white noise." It is beneficial to understand exactly what produces radio noise, its practical applications, and how it can affect an investigation.

If you're listening to the radio at home or in the car, the last thing you want to hear is radio noise. These unwanted noises and the hiss you hear in between radio stations are the result of random electrical signals always present in a radio receiver in addition to the desired radio signal.

Radio noise is made up of a combination of three main sources:

Radio Frequency Interference (RFI)Manmade radio frequency interference from other sources, such as electrical switches, motors, vehicle ignition systems, computers, and other electrical devices, is picked up by the receiver's antenna. These noises are often referred to as "static".

Thermal NoiseThermal noise is present in the receiver input...