There is also man-made noise.
Various industrial and household electrical appliances and power may interfere with the radio, so-called industrial or industrial noise.
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Industrial noise source can be any circuit in which there were frequent and abrupt changes in current, typically associated with the rupture of contacts, sparking the advent of current leakage through the insulation, gas ionization. In addition, their source may be devices that generate a high frequency.
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Powerful sources of interference are trams, trolley buses and electric trains, the motion 'which is accompanied by very frequent interruption of contact between overhead wire and pantograph. A sharp change in current or sparking may occur in electric motors and generators (arcing brushes) in all kinds of relays, in X-ray installations, calls, vacuum cleaners and other household appliances.
Man-made noise is also created by these appliances that spark, arc, even abrupt changes in current specially created and used. Examples of such devices may serve as electric welding machines, magneto ignition systems of internal combustion engines (including automobile), various electro medical apparatus, electric arc, arc projectors and many others. Currently, widespread special high-frequency generator used in industry and medicine. These devices tend to cause interference. And apparatus, using the phenomenon of gas ionization, are also sources of interference with the radio. In some cases, there is strong interference (in the form of whistles) from the vicinity of neighboring radios (due to poorly shielded regenerators and heterodyne or the presence of spurious coupling them with an antenna). Almost any electrical appliance, any facility or scheme may interfere with the radio. It is well known, for example, that the failure of the lighting and power switches and sockets, faulty or careless installation can cause the appearance of interference, and significantly stronger than that of high-power electric power devices.