Electromagnetic interference (EMI) can disrupt electronic devices from natural or artificial sources. Solar flares and aurora borealis are natural causes while any electronic device can create interference. Manufacturers comply with regional laws to prevent EMI. Deliberate EMI is used by law enforcement and military, but also by criminals and terrorists.
Electromagnetic interference (EMI) is a common problem that occurs with electronic devices when a device’s performance is disrupted or interrupted by electromagnetic radiation or conduction. The source of the IME can be of natural or artificial origin and in some situations it can become a very serious problem. In addition to appearing accidentally, electromagnetic radiation can also be created deliberately, such as military aircraft wishing to jam the electronic signals of enemy forces.
Solar flares and the aurora borealis are two common natural causes of electromagnetic interference. Both of these phenomena cause radiation that can interfere with electronic devices. Many people with radios have noticed that sometimes the signal experiences a profound decline in quality due to increased solar activity, making it difficult to hear radio stations through static and other signal disruptions. Solar activity can also disrupt the function of satellites and aircraft.
Any electronic device has the potential to create interference. They can cause narrowband or broadband interference that can do everything from creating wobble on a television screen to listening to phone calls through bamonitors. Wireless devices such as cell phones, cordless phones, and wireless Internet routers in particular are prone to electromagnetic interference. Anything that draws large amounts of energy, such as a refrigerator or air conditioner, can also be responsible for interference.
Manufacturers of electronic devices are generally required to comply with regional laws designed to prevent electromagnetic interference. These measures include proper grounding of electrical circuits and shielding devices so they are less prone to emitting radiation. Individuals may also be required to use dedicated circuits for particular devices, both as a safety precaution and to reduce electromagnetic conduction between these devices and devices on the same circuit.
Before being sold, electronic devices are usually tested for compliance with electromagnetic radiation laws. People can reduce the amount of EMI they experience in their homes and businesses by isolating items that might cause interference and ensuring devices are used as directed. Computers, for example, should be left shielded in their cases.
The deliberate generation of electromagnetic interference is a tactical tool used by some law enforcement agencies and the military to jam signals. Individuals such as criminals and terrorists can also build jammers for the purpose of blocking signals or interfering with the functioning of electronic devices.
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