The current situation and misunderstandings of using mobile phone jammers in prisons

Cell phone jammer Current situation:
1. The area that should be shielded is not strictly shielded, which is costly and laborious and has no actual effect;
2. The area that should not be shielded is seriously interfered, complained and cannot be used normally;
3. There is a gap between overly biased detection and pseudo base station technology, ideals and reality, and there are no real successful cases in China at present;

portable cell phone signal jammer

2. Misunderstanding:

①Using directional antenna can avoid interference
1. There is a certain transmitted signal strength outside the directional angle of the directional antenna, but it is much lower than the main lobe, not completely directional;
2. The reflection of the building will still cause external interference;
3. The frequency drift of the host computer seriously affects the base station and causes external interference;
4. TD full-time shielding interference must exist.

②The greater the power, the better
1. Inaccurate host frequency output, frequency drift, too wide bandwidth, waste of power, and interfered base station;
2. The simple frequency sweeping power suppression method has low shielding efficiency and large radiation;
3. The power is false standard, exaggerated publicity, and the nominal power loses its reference value;
4. Power is the foundation and technology is the key. It is better to find good methods and skills to fight for power;

③ The radiation of high power jammer is large, and the radiation of low-power is small
1. The high-power uses an outdoor antenna, which has a long operating distance, large shielding coverage, and uniform shielding signals, but radiation is minimal;
2. If the low-power equipment does not use multiple antennas for long-distance shielding, but is arranged in a centralized manner or 5 antennas are used together, the radiation power will be greater than 10 microwatts/square centimeter, and the short-distance radiation will definitely exceed the standard;

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