Why do you need to block the signal in the elevator?

Well、、It should be that the elevator itself is controlled by a computer.。。 You should know that when you play with the computer, the phone is too close to affect the work of the computer.。。 Therefore, the mobile phone signal will be blocked, otherwise it will affect the work of the elevator. I guess so.

There is no signal on mobile phones because the signal will be affected by various factors such as terrain, landform, and tall buildings during the propagation process, and if you are in a relatively closed place, the signal will be affected. Here's how to deal with it:

1.Turn the phone back on and off and try again;

2.Swap the SIM card to a family member's or friend's phone and try again;

3.Check to see if other Unicom users around you have a signal;

If there is no signal, you can contact human customer service for feedback.

There is no mobile phone signal receiving and transmitting device in the elevator, and the signal shielding is because of the elevator material, so there is no signal!

Because the elevator is made of steel on all six sides, it blocks the cell phone signal, creating a shielding effect.

It's not about avoiding it, it's about that kind of space. The relationship between the thick steel plate and the elevator wall is difficult to transmit under the conditions. But now many elevators have been covered by the signal.

Because if the signal is not shielded, it will cause the elevator circuit to clog, but the elevator will be out of service.

It shouldn't be a signal shield, it's that the signal is difficult to get in, and the metal blocks the signal.

Originally, the iron frame would have blocked the signal, not to mention that the signal was not blocked in the iron cage.

Signal relays are installed, and the mobile company is to install micro base stations.

The elevator itself is a hollow enclosed metal space, which can physically shield from radio waves, and mobile phones transmit information through radio waves, so naturally there is no signal.

Some elevators are not completely sealed, but they also have no signal. The reason is that the elevator shaft is often thicker concrete, which has a strong ability to absorb mobile phone signals, which will also lead to weak mobile phone signals, and signal amplifiers need to be installed at this time.

To make the signal cover the elevator, it is necessary to build a special elevator signal distribution system, usually adding wall-mounted antennas and logarithmic antennas on both sides of the elevator, or installing antennas in the car of the elevator. The cost of this work is high, so many developers are reluctant to spend extra money. If the elevator has signal coverage, you can see obvious operator prompts in the elevator.

Nowadays, with the popularity of elevator advertising, businesses need to install a signal system to advertise on the LED screen in the elevator through the wireless network. Recently, there have been frequent crimes in the elevator, and the elevator needs to be equipped with a monitor, and the signal also needs to cover the elevator.

Sorry for the inconvenience caused to your use, as an operator we attach great importance to network construction, has been constantly strengthening the breadth and depth of network signal coverage, because network coverage will be affected by many factors, we will strive to speed up the pace of network construction, and constantly improve the network coverage area, look forward to your continued attention and supervision, thank you!

There is no signal amplifier installed in the hoistway.

<> inside the elevator is a closed metal seal, the signal is blocked by the metal frame, and at the same time, there is no signal in the elevator, and there is generally no signal in the mobile phone in the sealed environment, and there will be no signal only if the signal amplifier is installed in the sealed environment.

In the monitoring head, that is, on the top of the elevator to add an anti-jammer can be about a few hundred yuan, depending on whether you want to buy good or second, the electronic market has to sell, buy it yourself, add it.

The place where the elevator needs to shield electromagnetic waves is only the control circuit part of the elevator, and there is no need to shield in the car, and sometimes it is even necessary to provide wireless communication signals - in fact, it is not possible to completely eliminate electromagnetic waves in the car, because every passenger who takes the elevator cannot be required to turn off all devices that may emit electromagnetic waves (such as the most typical mobile phone), so the design of the elevator will not require shielding electromagnetic waves.

However, because the car body is basically made of metal plates, it automatically has the effect of electromagnetic wave shielding.

To this end, in some high-end elevators, in order to ensure the continuity of passenger communication, wireless communication signals will be deliberately introduced into the car; In order to save costs and simplify maintenance, most ordinary elevators do not install communication signal enhancement equipment in the car, so they give people the illusion of "shielding electromagnetic waves".

The shielding of electromagnetic waves in the elevator is not intentional! Elevator control circuits and airplanes are two different things! Now most of the elevators are fully enclosed elevator halls! Two layers of metal inside and outside! Electromagnetic waves are completely isolated! Mobile phones can still be used in many non-fully enclosed old elevators!

It's the same principle as an airplane. There is interference with electromagnetic waves, and I am afraid that in case, even if it is a 1 in 10,000 probability of interference, an accident will occur in the event of a failure. So it must be shielded!

so as not to interfere with the microcircuits inside.