The mobile phone signal shielding device adopts the latest interference technology of Israel to generate a fixed electromagnetic signal, covering the mobile communication GSM, CDMA, GPRS, local telephone communication, and PHS frequency bands, so that the mobile phone can not be used in certain specific places, thereby solving some problems. The negative impact of mobile phone signals in life now. The common mobile phone signal shielding device on the market has a frequency of 869~894MHz, 925~960MHz, 1805~1880MHz and 1900~1990MHz. The frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control the range of about 40 meters in diameter, using DC-DC converter input voltage, 5V output voltage. After the 3G signal is released, the working frequency band of the mobile phone signal shielding device on the market is also upgraded from the previous four frequency bands to five frequency bands. On the basis of the previous four-band, there are more bands from 2100 to 2200. Used to shield and interfere with the 3G band. It is based on the uplink and downlink channels of the mobile phone system, using frequency multiplication, frequency division, frequency hopping filtering and other technologies to analyze the required shielding frequency; customizing a spherical shielding space according to the power of the shielding device, automatically forming a shielding magnetic field within a specified range. Mobile phones (including PHS-China Telecom PHS GSM-China Unicom, China Mobile, CDMA-China Unicom) have failed in this space. When the shielding device is in working state, the function of transmitting and receiving signals of the mobile phone in the specified range is invalid, and it is impossible to dial out and dial in, thereby achieving the purpose of mandatory disabling. So how do you crack the signal blocker? Here are three ways to crack the signal jammer. Enter your phone settings, click "Network Settings", change the network mode to "Manual Mode", then enter "Network Search" and wait until the words "China Mobile" or "China Unicom" appear, and immediately exit. The phone will have a signal, but the length of the anti-screening depends on the quality of the phone. This method works for most mobile phones. Principle: The work of the mobile phone is in a certain frequency range. The mobile phone and the base station are connected by radio waves, and the data and sound are transmitted at a certain baud rate and modulation mode. Then, the mask scans from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. The scanning speed can form garbled interference in the message received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. Mobile phones are characterized by search networks, no signals, no service systems. Because the working principle of the shielding device is to shield the mobile phone by interfering with the signal of the mobile phone of the specified band, so as long as the receiving frequency of the mobile phone is modified, the shielding can be prevented, and the shielding device can only shield the mobile phone signal of 900---1800MHZ, and the mobile phone accepts The transmitting frequency is 850-1900MHZ, which is much larger than the shielding range of the shield. Therefore, as long as the receiving frequency of the mobile phone is adjusted to the maximum in the mobile phone setting, the mobile phone signal can be normally accepted. This method has higher requirements for mobile phones and the environment, but the effect is also best and most concealed, provided that the mobile phone must have a wireless network around the wifi wireless Internet function. After searching and successfully connecting to the available wireless network with your mobile phone, even if the mobile phone has no signal, you can still access the Internet without taking traffic. ZTTEK Batteries, For 5G backup base station .Customize the lithium ion battery packs according to the application and product requirements of the customers. 48V200Ah Lithium Ion Battery,Lifepo4 Battery 48V 200Ah,Rechargeable Battery 48V 200Ah,48V 200Ah Lifepo4 Battery Pack Jiangsu Zhitai New Energy Technology Co.,Ltd , https://www.jszhitaienergy.com
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