Many places need Cell Phone Blocker Block Diagram , but many people don't know how to install a cell phone signal jammer. Some people think that the cell phone signal jammer can be used directly by connecting to the power supply, but some people think that it is necessary to adjust the frequency, whether cell phone jammer is difficult to work or not. Conclusion, so let's look at the principle of interference. Adjacent frequency interference refers to signal interference from frequencies adjacent to the applied signal frequency. Adjacent frequency interference is caused by the unsatisfactory reception filter, which causes the signal of adjacent frequency to leak into the transmission bandwidth. Adjacent channel interference can be minimized through precise filtering and channel assignment. If the base station of the adjacent channel transmits in the range very close to the receiver of the user, and the receiver uses the base station signal of the preset channel, this problem will become very serious, this is called the near-far effect. When two or more different frequency signals act on a nonlinear circuit, they will modulate each other to generate a new frequency signal output. If the frequency falls within the operating channel bandwidth of the receiver, it will interfere with the receiver and become intermodulation interference. .
Any receiver has a certain reception dynamic range. When the out-of-band interference signal is strong to a certain extent and the reception power exceeds the maximum power level allowed by the reception dynamics, it will cause the receiver to be fully blocked, thereby affecting the reception performance of the system. called jamming. Blockage will cause the receiving machine to fail to work normally, and long-term blockage may also cause permanent performance degradation of the receiving machine. Because of the roll-off characteristics of the transmit filter, there is always a certain amount of out-of-band radiation, which is what we generally call the transmit spur. The interference caused by the transmission spurs is called spurious interference. In-band interference: The CDMA transmitting signal directly acts on the GSM receiver as in-band noise through methods such as intermodulation, resulting in a decrease in the sensitivity of the GSM receiver. This type of interference is further divided into transmission spurious interference and intermodulation interference; out-of-band interference: when the out-of-band interference is strong to a certain extent, it will cause the receiver to be fully blocked, thus affecting the reception function of the GSM system. This type of interference is also called Blocking interference, the use of Cell Phone Blocker Block Diagram is convenient for our life, but its signal is easily interfered, so it is still necessary to adjust its frequency.
