What is the minimum effective range of a mobile phone signal jammer?
Generally speaking, the minimum effective range of a mobile phone signal jammer is within a few dozen meters. If there are enough jammers, the maximum range can be almost unlimited, such as in a prison, where the signal can be completely shielded. Generally, for a house of about 100 square meters, one cell phone signal jammer is enough.
The effective range of a mobile phone signal jammer depends on its output power. In actual tests, the signal blocking range varies according to the strength of the local environmental signal. For example, the weaker the indoor signal, the wider the shielding range may be, while the outdoor signal, such as near a GSM base station, may be closer to the outdoor shielding area.
Theoretical analysis shows that in a small conference room or classroom, if the transmission power of the mobile phone signal jammer is set too high, electromagnetic waves will gather in a confined space and penetrate the walls that were originally to be isolated. Multiple reflections from the ceiling and the ground will lead to increased electromagnetic pollution in the examination room. The survey shows that mobile phone signal jammers are widely used in important exams such as the college entrance examination and the high school entrance examination. However, in some examination rooms where jammers are used, candidates (including invigilators, candidates, and teachers) often experience symptoms such as irritability, lack of concentration, and even headaches. This shows that excessive transmission power of mobile phone signal jammers will seriously affect the normal thinking ability of candidates in the examination room.
When it is really necessary to use a jammer, it is recommended to choose a low-power mobile phone signal jammer. If one jammer can effectively solve the problem, there is no need to install multiple devices. In addition, it is recommended to place the jammer in a lower position to avoid hanging it directly above the candidate’s head to avoid harm to human health.
