Simply put, they emit random static or noise on a sweeping range of frequencies, strong enough that a device closeby cannot connect to what it supposed to. Kind of like being beside a running car engine, with the hood open, while trying to talk to someone on the phone. The local noise becomes overpowering so the device can’t make its usual connection. By quickly covering a range of frequencies, they effectively block a device from operating normally.
Its emission of electromagnetic disturbance signal carrier frequency and the carrier frequency of the same, so be a receiver and amplifier demodulation (reduction), interference signal and interference signals in the receiving terminal at the same time. It’s like with fake goods (like interference signals) transporter and transporter of real jamming signal (like) model (carrier frequency), the same appearance only car from goods receiving, the result is really fake goods to the shipper together. Electronic jamming power strong enough, capped by interference signal, the interference can be to achieve.
Russia’s Rossiyskaya Gazeta daily cited military experts as saying that the Rychag-AV GPS jammer added significantly to reducing the effectiveness of the US air strike on Syria’s Ash Sha’irat airbase in April 2017.
The signal jammer’s role is to interrupt the communication link (or network) between two (or more) “partners”, when they are trying to talk with each other or deliver certain data between them. Jamming the communication link between a Drone and its Operator is a specific case out of many more; we can try to jam the communication between a cellular and the base station, between two tactical radios, between a bomb and a remote control that is used to activate it, etc.
This is the time for one more important clarification. Usually, in the Anti-Drone application, the intention is to jam the Drone when it is hundreds of meters away from the sensitive area/perimeter (where the Jammer is installed). For example, we want to jam a Drone, which is 300 meters away from the Jammer and flying at an altitude of 10 meters. As can be understood, in this case the diagonal distance between the Jammer and the Drone is about the same as the horizontal distance between them. Therefore, in order to simplify things, we will be discussing horizontal distances and we will not bother our selves with calculating the exact distance, because the difference is quite small.