Installing Signal Jammers: Maximizing Effectiveness in Different Scenarios


Students who have taken exams are likely aware that standardized exam venues install signal jammers to block mobile phone signals. Some schools even activate signal jammers during class hours to prevent distractions, while others install them in dormitories to ensure stable study and sleep schedules. But how can signal jammers be installed to maximize their effectiveness? This article will explore two scenarios and provide guidance on installing signal jammers.

Scenario 1: Temporary Usage for Major Exams

For major exams such as college entrance exams, graduate entrance exams, and English proficiency tests like the TOEFL or IELTS, where the usage is temporary, it is not necessary to permanently install signal jammers due to the short duration and the need for convenience and flexibility. In this case, signal jammers can be brought into the exam area and plugged into a power source before the exam begins. Typically, signal jammers are placed around the podium for easy access to power. If the jamming effect is not satisfactory, the device can be placed on a chair or table, with an optimal distance of 1.5-2 meters from the ground. If only one device is to be placed in the classroom and there is concern about blocking the area behind the podium, it can be positioned in the middle of the classroom’s side. This reduces the length of the area that needs to be shielded, resulting in better effectiveness. Once a power source is found, the signal jammer can be activated.

Scenario 2: Long-term Usage in Classrooms

For classrooms where signal jammers need to be used on a long-term basis, they should be permanently installed in a fixed location. The installation height should be between 1.8-2 meters to achieve optimal jamming effectiveness and prevent intentional damage. Additionally, a unified switch management system should be implemented. The signal jammers in each classroom should be connected and controlled by the school, allowing for one-click activation and deactivation. This eliminates the hassle of individual classrooms managing their own signal jammers. In this case, signal jammers produced by electrical and mechanical manufacturers can be chosen. While this option is more convenient for later use, some construction work is required before installation. Compared to the first method, which is simpler and only requires a power source, the second method may require significant manpower and resources if there are many exam classrooms. Therefore, schools should choose the appropriate method based on their specific needs.


Installing signal jammers in exam venues or classrooms is crucial to maintaining a fair and distraction-free environment for students. By following the guidelines provided in this article, schools can ensure that signal jammers are installed effectively, maximizing their ability to block mobile phone signals and create an optimal learning and testing environment.