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 shielding device of 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 in 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, so this brings an opportunity to the organizers of the test. Worry: Will the test room signal jammer affect the FM broadcast during the test?

First of all, from the basic working principle of the test room isolator, in theory, the radio frequency interference signal emitted by the test room isolator will not overlap with the transmission frequency of the FM broadcast, that is, it will not interfere with the FM broadcast. The test room isolator mainly interferes with the frequency band used by common cheating tools such as mobile phone signals, WiFi signals, and wireless data transmission. 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 isolator manufacturer will still have different transmission frequencies, or some test room isolators. 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 the distance from the test room isolator is relatively close. 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 shielding device during the listening test time period, and wait until the listening test is over before uniformly shielding all test rooms the device is turned on.