Every year, there are listening tests in CET-4 and CET-6 and some qualification level examinations. Before the examination, the examination room will use an intelligent jammer to shield the mobile phone signals in the examination room, so as to prevent examinees from using communication tools for the examination

Cheating. Many schools report that after the wireless jammer is turned on, it will interfere with the campus broadcast to a certain extent. In some areas, the broadcast signal interference is serious. After the wireless jammer is turned off, the interference will disappear. Now let's talk about the causes of this situation and how to solve it.

First of all, as a form of FM radio, campus radio no longer uses loudspeakers. Many schools now basically use campus radio to broadcast English programs or other programs, which is similar to the radio we normally listen to. The normal frequency range of this broadcast is 76-88MHz. The signal transmitted by the intelligent jammer is the white noise jamming signal with the same frequency as that used by the mobile phone. The lowest frequency band is 700M radio and television 5G band, which is different from the signal frequency of the campus broadcast. It can even be said that it is far from the same. The reason for the interference to the campus broadcast signal is that the intelligent jammer has raised the bottom noise in some areas of the examination room after it is turned on. This bottom noise submerges the campus broadcast signal, so the broadcast signal is interfered. How to solve this problem?

Solution:

1. Adjust the transmission frequency of campus broadcast, and conduct interference test to find out the use of the campus broadcast frequency band with the least interference.

2. If it is impossible to find out the campus broadcast frequency band with the least interference, the intelligent jammer shall not be turned on during the listening test, and shall be turned on after the listening test.

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