The (usually deliberate) transmission of radio signals can disrupt communications by reducing the signal-to-noise ratio. The other type is unintentional interference, which occurs when the operator broadcasts on a busy frequency without first checking whether it is in use, or cannot hear the radio using that frequency. This can also happen when the device is transmitting a signal accidentally (for example, a cable TV device that is accidentally transmitting on the emergency frequency of an airplane). This concept can be used in wireless data networks to disrupt the flow of information. Some countries will use cell phone jammer to prevent foreign radio stations in border areas from reaching the country.
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