These can be divided into two groups: obvious and subtle. The most common types of this form of signal jamming are random noise, random pulse, stepped tones, warbler, random keyed modulated CW, tone, rotary, pulse, spark, recorded sounds, gulls, and sweep-through. Digital wireless jamming for signals such as Bluetooth and WiFi is possible with very low power. A transmitter, tuned to the same frequency as the opponents' receiving equipment and with the same type of modulation, can, with enough power, override any signal at the receiver. Intentional communications jamming is usually aimed at radio signals to disrupt control of a battle. For inadvertent disruptions, see electromagnetic compatibility. However, the distinction is still not universally applied. Originally the terms were used interchangeably but nowadays most radio users use the term 'jamming' to describe the deliberate use of radio noise or signals in an attempt to disrupt communications (or prevent listening to broadcasts) whereas the term 'interference' is used to describe unintentional forms of disruption (which are far more common). Another form of unintentional jamming occurs when equipment accidentally radiates a signal, such as a cable television plant that accidentally emits on an aircraft emergency frequency.ĭistinction between 'jamming' and 'interference' Unintentional 'jamming' occurs when an operator transmits on a busy frequency without first checking whether it is in use, or without being able to hear stations using the frequency.

Devices that simply cause interference are regulated differently.

Jamming is usually distinguished from interference that can occur due to device malfunctions or other accidental circumstances. Vietnamese siren jammer trying to jam Radio Dap Loi Song Nui, an anti-government and communist radio station.

Cell phone jamming