Installing radio frequency jammer  for each exam venue during various types of exam processes is a standardized exam venue. However, almost over 90% of exam rooms choose low-power radio frequency jammer  devices. There are normal high-power shielding devices available in the market, so why don't exam rooms use high-power radio frequency jammer

Analyze and answer from two perspectives: firstly, analyze the product performance and application scenarios of high-power radio jamming equipment itself, and secondly, analyze from the construction party of the examination room.

The biggest feature of high-power radio frequency jammer is its high transmission power and wide coverage. However, in its instructions for use, there will be a clear reminder that the high-power radio frequency jammer  is mainly used in outdoor open environments, such as the examination room, which is obviously an indoor environment with a large number and dense distribution, and each room in the examination room is isolated by walls. The barrier of this type of wall can cause significant error interference signals, making it easy for interference signals to only cover local areas or floors. It is precisely considering these factors that high-power shielding devices are strictly required not to be installed inside buildings, but must be installed at an appropriate distance around a building. Moreover, for a building, it is usually necessary to install at least 2-4 sets of high-power radio frequency jammer to basically meet the demand for signal interference.

The high-power mobile phone shield itself also has the characteristics of large volume, large weight, high requirements for heat dissipation and ventilation, and high purchase costs. These characteristics also determine that it is not easy for the exam room to choose high-power models.

The second reason analyzed from the examination room construction party is that due to the large size and heavy weight of high-power radio frequency jammer, the installation and construction are relatively complex and time-consuming. Due to the significantly higher procurement cost of high-power radio frequency jammer compared to low-power radio frequency jammer, the price ratio of the two can reach 50:1 or even 100:1. Similarly, taking a building as an example, assuming there are 50 examination halls and classrooms in this building, using low-power radio jamming equipment, even if one is configured for each classroom, the total quantity is 50. But if replaced with high-power radio jamming equipment, it is possible to require at least 2-4 units. Based on the aforementioned price ratio, it can be concluded that using high-power mobile phone shielding may increase the construction investment cost by 2-4 times.