Using mobile phone signal jammers in campus examination rooms, will it affect the class time of the radio clock?

It is quite common to use mobile phone signal blockers in examination halls, and it is not uncommon to encounter mobile phone signal blockers. Another common device in examination halls is the radio-controlled clock. As the name implies, the radio-controlled clock is not just an ordinary clock that displays the time, but a clock that ensures accurate timekeeping by receiving the wireless signal from the National Time Service Center, which is more advanced than ordinary clocks.

Now let’s see whether the mobile phone signal blocker will interfere with the radio-controlled clock, because the signal being blocked is a wireless signal. To determine whether the mobile phone signal blocker will interfere with the radio-controlled clock, you need to understand the frequency used by the radio-controlled clock when receiving the wireless signal from the National Time Service Center. There are two types of radio-controlled clocks that receive signals from the National Time Service Center: one is to receive the timing signal through GPS, and the other is to obtain the timing signal through 4G signals.

The signal emitted by the mobile phone signal blocker does not contain the frequency of the GPS signal, so it will not interfere with the timing signal of the radio-controlled clock using GPS. However, if another radio-controlled clock obtains the timing signal through the 4G signal, the mobile phone signal blocker will interfere with the timing signal received by the radio-controlled clock, but there is no need to worry that the radio-controlled clock will have a large time error due to this interference.

The radio clock receives the timing signal, which is mainly used to adjust the time displayed on the clock. The mobile phone WiFi jammer will not affect the normal operation of the radio clock. Even if the radio clock does not receive the timing signal, it will continue to display the current time according to the internal clock. Therefore, even if the radio clock is interfered by the shielding signal of the cell phone jammer, it will not cause a large error in the displayed time. Even if the radio clock has not received the timing signal calibration for a long time, such as more than half a year, the error between the time displayed by the radio clock and the standard time is very small and can be ignored.

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