What aspects should be considered when purchasing wireless signal jammers?

Wireless signal jammers have become an indispensable tool in various examination halls and meetings such as the junior high school entrance examination, postgraduate entrance examination, CET-4 and CET-6, civil service examinations, and professional examinations. They are used to shield wireless signals, prevent cheaters from using electronic devices, and ensure the fairness and integrity of the examinations.

Wireless signal jammers have different names such as signal jammers and signal isolators. They use frequency multiplication, frequency division, frequency hopping filtering and other technologies to analyze the frequency that needs to be shielded. According to the power size of the jammer, a special shielding space is formed to generate a shielding magnetic field within the specified range, making the mobile phone signal ineffective. After the jammer is activated, signal transmission and reception are prohibited in the specified area, blocking incoming calls and dialing, and effectively suppressing the signal.

There are many suppliers of wireless WIFI jammers, and they are of various types. When purchasing, the following factors are usually considered:

1.Appearance:

Although not the most important, the structure of the jammer may vary. It can have an external antenna or an internal antenna. The built-in antenna jammer contains the antenna and power supply in the shell, making it compact and easy to use. For the examination room, it is recommended to choose a built-in antenna signal jammer. The appearance of the jammer should also consider the visual experience of the examinees, striving for simplicity and unobtrusive colors to avoid causing visual stress.

2.Power:

Jammers are generally divided into low power, medium power or high power. High-power jammers are not recommended unless used in special circumstances because they can seriously interfere with base station signals and emit higher levels of radiation. Low-power jammers are recommended for educational exams, standardized examination rooms, and conference rooms. If low-power jammers are ineffective in certain areas, multiple cellular distribution points can be used to obtain better coverage, which is more effective than using a single medium-power or high-power device while minimizing radiation.

3.Power supply method:

The jammer can be powered by a handheld built-in lithium battery for easy carrying. Once the battery is exhausted, it can be recharged using a charger. Alternatively, for desktop jammers used in examination rooms, a 20V power supply connected to a 220V voltage source is usually used.

4.Frequency requirements:

Before purchasing, it is critical to determine the specific signal that needs to be shielded. Typically, mobile phone signals (2G, 3G, 4G, and 2.4GHz Wi-Fi) are common shielding targets.

5.Shielding effect:

This is an important aspect when choosing a wireless signal jammer, but it is often overlooked. Many manufacturers may forcefully recommend a certain jammer without fully understanding the signal environment and range of the examination room. This may result in poor shielding performance and incomplete wireless signal blocking. Therefore, when purchasing a mobile phone signal jammer, it is recommended to conduct on-site testing and cooperate with manufacturers who can provide customized shielding solutions based on the specific examination room environment.

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