Mobile jammers are used under legal premises

Spokane, Washington-A school in Spokane, was frustrated by the continuous interruption of cell phone text messages and calls, so it invested in a device that prevented cell phones from working. Spokane spent dozens of dollars on the Internet to buy a mobile cell phone jammer, and has just completed a three-day trial period to prevent students who often play with mobile phones in class.

Director John Hook said: “We just think this is what we want to evaluate.” The Mead School District worked with the FCC to determine whether the low price of cell phone jammers is legal before being used again. The mobile phone signal jammer is turned on during school hours and turned off during traffic hours and lunch breaks. “We believe that during school, sometimes parents need to contact students, and students must contact family members, doctors, etc.”

How many meters the mobile phone jammer can shield is not only related to its own transmission power, but also to the distance of the base station in the environment (the base station is not limited to the large transmission tower built on the ground), the ground, the signal amplification antenna on the roof and some The signal amplification distribution in the building). Another important factor is obstacles. If it is a metal material, it will be directly blocked; if it is a solid reinforced concrete wall, it will attenuate at least 10 times after penetration.