A Correct Understanding of Prison Signal Jammers
With the development of the communications industry, especially 5G technology, mobile communications have brought significant convenience to people's lives. However, the negative impact on highly sensitive environments like prisons and detention centers is becoming increasingly apparent. If mobile phones are brought into prisons and used by criminals, they can pose a significant threat to the management and security of these facilities. This brings us to the question of signal jammers for sale. Only by establishing a truly effective signal jamming system can prisons and detention centers provide strong physical defense. However, due to the current mixed market, many inexpensive jammers are limited by performance, reliability, and operating conditions, making them primarily suitable for general civilian use. They may present certain issues when used in larger facilities like prisons and detention centers.
1. Technically speaking, signal jammers are just a small subset of wireless information blocking systems. Their essence is electronic countermeasures, or co-channel jamming. This involves using a device to emit high-frequency signals through its antenna, causing errors in the downlink signal received by mobile phones, preventing them from identifying and accessing the network. The phone then displays "no network," effectively blocking the signal.
2. Signal blocking requires interfering with the base station's downlink signal. However, due to technical, cost, price, and production constraints, some manufacturers struggle to limit interference to the downlink. Consequently, some unscrupulous manufacturers, in an effort to improve signal jamming effectiveness, neglect precise frequency adjustments, resulting in some interference energy on the uplink. This can significantly increase jamming power, potentially achieving a positive effect, but at the expense of public safety.
3. Within the same room, wireless signals can vary significantly at different locations and times. Experience suggests this can reach as much as 10dBm, which translates to a tenfold difference in power output. Therefore, wireless signal blocking is a highly technical undertaking and cannot be simply achieved by purchasing a cell phone signal jammer and installing it yourself. Site surveys, power calculations, construction design, and equipment commissioning are all complementary and inseparable.
4. From a professional perspective, the prison's procurement and installation of hundreds of cell phone signal jammers presents significant challenges. When wireless signal shielding is required in a large, complex environment, a combination of high-gain antennas for wide-area shielding and supplementary optimization with indoor antennas for smaller, leaky areas should be employed. The antenna angles and power levels require professional configuration and commissioning to achieve the perfect effect of strict shielding inside the prison while preventing interference outside.
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