Due to the relatively small size of the portable frequency jammer, usually in the form of a trolley case or a backpack, it has strong application characteristics of portability and quick transfer, so it has been favored by many military or special police departments, but recently these In the past few years, we often see that the technical specifications of some procurement projects mention that the total RF transmission power of a complete set of portable frequency interference cannot be greater than 500W, but at the same time, its effective interference radius is required to be greater than 100 meters. Is this requirement reasonable? ? Does the portable frequency jammer with the total transmission power controlled within 500W really have such a good effect?
The frequency jammers we are familiar with basically use the interference signal to act on the target frequency band, and rely on the way of wide-band power suppression to achieve the interference effect. Nowadays, a full-standard frequency jammer needs at least 10-12 interference frequency bands only for mobile phone signals. If it needs to include remote control, walkie-talkie, GPS navigation and positioning, UAV image transmission, flight control, etc. and other interference frequency bands, then the total number of interference frequency bands will reach at least 18 or more. Through calculation, it can be seen that assuming that the upper limit of the total RF power of the interference signal is limited to 500W, then the average power on these interference frequency bands is only 20-30W. According to such power intensity, it is actually difficult to achieve an effective interference radius greater than 100 m.
If you want to achieve an effective interference radius of 100 meters, this will require some necessary test environments. For example: when testing the interference distance of mobile phones, it will be required that the base stations around the test site should not be too close, and the distance between the base stations should be as close as possible. reach more than 1 km. But in a real scene, it is difficult to find an environment where there are no base stations within a radius of 1 kilometer. In almost the vast majority of cases, if a location is randomly selected, there must be a mobile phone base station within a few hundred meters around it, and the number of base stations is very likely to be not a single one, but multiple ones exist at the same time, but each base station There will be a difference between far and near.
In most real application scenarios, to improve the interference effect of the portable frequency jammer, that is, to expand the interference radius, there are not many methods that can be adopted. The simplest and most effective method is to increase the transmission power of each interference module, but doing so As a result, it is bound to bring the total power to exceed the limit of 500W?
The final conclusion is: the current mainstream portable frequency jammer, its transmission power and number of frequency bands are generally not too high, it needs to be comprehensively evaluated with the appearance size, weight, power supply battery capacity, power consumption, etc. Appropriate trade-offs.
