Installation Considerations for Wireless Signal Blockers


Wireless signal blockers, also known as signal jammers, are devices used to block or disrupt wireless communication signals. They are commonly used in various settings, such as prisons, theaters, and examination halls, to prevent unauthorized use of mobile phones or other wireless devices. However, when installing wireless signal blockers, certain factors should be taken into consideration to ensure their effectiveness and proper functioning.

1. Installation Height:

The installation height of a wireless signal blocker should ideally be no lower than 1.8 meters from the ground. This height ensures that the blocker can effectively cover the desired area and minimize signal interference.

2. Distance from Base Stations:

It is crucial to install the signal blocker at a considerable distance from base stations. The closer the signal blocker is to the base station, the smaller the range of signal blocking. Therefore, it is recommended to position the blocker far away from base stations to achieve optimal results.

3. Antenna Connection:

Before powering on the wireless signal blocker, it is important to ensure that the external antenna, if applicable, is securely connected. The antenna should be tightened and kept in a vertical position. The markings on the antenna should correspond to the labels on the main unit’s antenna ports. It is strictly advised not to power on the signal blocker without connecting the antenna to prevent any potential damage to the device.

Testing the Effectiveness of Wireless Signal Blockers:

To assess the effectiveness of a wireless signal blocker, it is recommended to conduct on-site testing using multiple mobile phones from different network carriers. This method provides a convenient and straightforward way to evaluate the performance of the blocker, especially for non-professionals who may not have access to specialized testing equipment. The following steps outline the testing process:

  1. Prepare multiple mobile phones, preferably from three different network carriers.
  2. Power on the wireless signal blocker.
  3. Test the effective blocking distance of the signal blocker by moving each mobile phone closer to or farther away from the blocker’s location. It is advisable to test the blocking distance in multiple directions.
  4. Verify if the mobile phones are being blocked. It is important to note that relying solely on the signal strength displayed on the mobile phone may not provide accurate results. Instead, make periodic calls every few minutes to test connectivity. Try dialing a local toll-free number or a colleague’s phone number. If the call cannot be connected, it indicates that the mobile phone is within the effective blocking range of the signal blocker. Conversely, if the call goes through, it suggests that the signal blocker’s range has been exceeded.


Proper installation and testing of wireless signal blockers are essential to ensure their effectiveness in blocking wireless communication signals. By following the recommended installation height, maintaining a suitable distance from base stations, and conducting thorough testing using multiple mobile phones, users can determine the range and efficiency of the signal blocker. These guidelines provide a practical approach for individuals without specialized knowledge or testing equipment to assess the performance of wireless signal blockers accurately.