Will the test room signal jammer affect the RF broadcast?

Dojammer 2022-08-27

Every year, some colleges and universities organize CET-4 and CET-6 examinations, and the examination rooms for such examinations are constructed in accordance with the model of standardized examination rooms. Among them, the shielding device in the examination room, as one of the important guarantees to prevent information cheating, has become one of the necessary equipment in the standard examination room. However, the listening test occupies a fixed proportion in the content of CET-4 and CET-6. In the listening test, candidates listen to the listening content of the test through FM radio, which brings concerns to the test organizer: Will the test room shield affect the FM radio during the test?

First of all, from the analysis of 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 bands used by common cheating tools such as mobile phone signals, WiFi signals, and wireless data transmission. The frequency band of broadcasting is mainly concentrated in about 70 to 110 MHz, and there is no overlap between the two frequency bands.

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However, although the theoretical analysis shows that there is no interference in the same frequency band, it is still necessary to prevent the occurrence of additional factors. After all, the equipment produced by various signal jammer manufacturers will still have different transmission frequencies, or the filtering performance of some test room isolators is too poor, resulting in a certain amount of interference harmonics, or the background noise is greatly increased. In some cases, noise is generated when the test content is received via FM broadcast. Will have a certain impact on the hearing test.

Therefore, in order to ensure the smooth progress of the English listening test, many test rooms will first choose not to activate the shielding device of the test room during the listening test time period, and will block all the equipment in the test room after the listening test is over.

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