1. Choose a mobile phone signal jammer and take it to the office, home or other different units for on-site testing. You will see that in different on-site environments, one is that the shielding distance will be different, and the other is the type that you thought could not be shielded. , After changing different sites, the shielding effect will be there. Mobile phones of different standards, such as China Mobile, China Unicom, and Telecom, have different effective signal shielding distances each time they change a site environment.
2. In the scene where the base station is close and affects the signal shielding distance, place the mobile phone within 1 meter around the mobile phone signal jammer, keep the test in the standby state for 1 minute, do nothing for 1 minute, and observe whether the mobile phone is in 1 minute. There is still a signal or make and receive calls, surf the Internet, etc. If the signal shielding state can be maintained continuously within a range of 1 meter, it means that the mobile phone signal jammer is usually operating normally, but the distance of signal shielding is too short because the base station is too close.