How does the mini portable cellphone jammer j 260a shield the signal
mini portable cellphone jammer j 260a, I believe students in the past few years know what it is, the most common radio jamming device in the examination room. It mainly interferes with the cell phone signal in the nearby area, causing the cell phone signal to lose connection with the base station.
Within a certain frequency range, the mobile phone and the base station are connected by radio waves, and data and sound transmission are completed with a certain baud rate and modulation method. In view of the above communication principle, the mobile cell phone jammer scans from the low end frequency of the forward channel to the high end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as a search network, no signal, no service system and other phenomena.
How to avoid signal interference
Method 1: Due to the rapid development of wireless networks, it has now developed to 4G networks, and many examination rooms use older mini portable cellphone jammer j 260a, which can only shield 2G networks such as PHS, China Mobile, and China Unicom. Even the current 4G network is helpless, the cracking method: use 3G or 4G card.
Method 2: Band cracking method. Because the school’s mini portable cellphone jammer j 260a works by shielding the mobile phone by interfering with the mobile phone signal of the designated band, so long as the mobile phone’s receiving transmission frequency is modified, it can be prevented from being shielded. The receiving transmission frequency is 850-1900MHZ, which is much larger than the shielding range of the jammer, so as long as the receiving transmission frequency of the mobile phone is adjusted to the maximum in the mobile phone settings, the mobile phone signal can be received normally.
Method 3: WIFI cracking method. This method requires relatively high environmental requirements, provided that there must be an available wireless network around. Some mobile phone signal interference jammers cannot shield WIFI signals and can communicate with the outside world.
Method 4: Bluetooth cracking method. It is suitable for short-distance communication in the shielded area. Some mobile phone jammers may ignore the transmission function of Bluetooth without shielding, so we only need to install Bluetooth messaging software on the mobile phone to communicate normally in a small area.
Finally, with the rapid development of the network,mini portable cellphone jammer j 260a are also being updated, and the cost is very low. You only need to add the frequency band of the known network to the interference ranks to shield all radios.
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