Every year, some universities organize and carry out CET-4 and CET-6 exams, and the examination room for this kind of examination is constructed according to the model of the standardized examination room. Among them, the jammer in the examination room, as one of the important safeguards to prevent information cheating, has become the standard examination room. One of the must-have equipment. However, the listening test occupies a fixed proportion of the content of the CET-4 and CET-6 exams. During the listening test, candidates listen to the content of the test through FM radio, which brings an opportunity to the organizers of the test. Worried: Will the jammer in the exam room affect the FM broadcast during the exam?

First of all, from the basic working principle of the test room jammer, in theory, the radio frequency interference signal emitted by the test room jammer will not overlap with the transmission frequency of the FM broadcast, that is, it will not interfere with the FM broadcast. The test room jammer mainly interferes with the frequency band used by common cheating tools such as mobile phone signals, WiFi signals, and wireless data transmission, while the frequency range used by the FM broadcasting system is generally 70-110MHz. The frequency bands are far apart.

However, although there is no interference in the same frequency band from the theoretical analysis, it needs to be considered. After all, the equipment produced by each test room jammer manufacturer will still have different transmission frequencies, or some test room jammers. The filtering performance is too poor, a certain number of interference harmonics are generated, or the background noise is greatly increased, which will cause noise when receiving the test content through the FM broadcast when it is close to the jammer in the test room. It will have a certain impact on the listening test.

In order to ensure the smooth progress of the English listening test, many test rooms will first choose to not activate the test room jammer during the listening test time period. the device is turned on.