How to solve the problem of interference to campus radio after the cell phone signal jammer is turned on?

 Every year, there will be a listening test in the CET-4 and CET-6 exams. Before the exam, the examination room will turn on the cell phone signal jammer to interfere with the mobile phone signal in the examination room to prevent candidates from cheating in the exam using communication tools. Many schools reported that after turning on the mobile phone signal jammer, there was a certain degree of interference to the campus radio. The radio signal interference in some areas was serious. After turning off the mobile phone signal jammer, the interference disappeared. Let's talk about the reasons for this situation and how to solve it.

28 Band Cell Phone Signal Jammer GPS Wifi Signal Blocker

First of all, campus radio is a kind of low-power FM radio. Many colleges, middle schools and even schools have now adopted campus FM radio to broadcast English programs or other programs. The frequency range is usually between 76-88MHz. The signal emitted by the mobile phone signal jammer is a white noise interference signal with the same frequency as that used by the mobile phone. The lowest frequency band is the 700M radio and television 5G frequency band, which is different from the signal frequency of the campus radio. It can even be said that it is far different. The reason for the interference to the campus radio signal is likely that after the mobile phone signal jammer is turned on, the bottom noise in the examination room is increased in some areas. This bottom noise drowns the campus radio signal, so the radio signal is interfered. So how to solve it?

Solution:

1. Adjust the transmission frequency of the campus radio and conduct interference tests to find the campus radio frequency band with the least interference.

2. If you cannot find the campus radio frequency band with the least interference, you must not turn on the mobile phone signal jammer during the listening test, and turn on the signal jammer after the listening test.

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