Restaurants start using mobile phone blockers
When you are having lunch, if suddenly the phone rings, you may be making noise while eating, how would you feel? May you have a very bad memory. That's why more and more restaurants are starting to answer phones at doors marked with restaurant bans. However, it is clear that the effect is poor. So restaurant operators have to choose to use cell phone jammers.
At least two restaurants in London, England, have installed jamming devices designed to prevent customers from making or receiving cellphone calls while dining at the restaurant.
Then, let's see how the device works. The physics of jamming your phone is actually pretty simple. Cell phones work by sending signals along the range of the electromagnetic spectrum reserved for their use. (In the US, that part is usually measured at 800 or 1,900 MHz; in Europe, it's usually 900 or 1,800 MHz.) All a cell phone jamming device needs to do is broadcast a signal on these same frequencies, and it will interfere with anyone trying to get within that range. transmission device. What is the ultimate impact on the unfortunate cell phone user? The phone screen will just show that there is no signal available.
Why must there be a jamming device?
Verizon Wireless visited an upscale Maryland restaurant last year, the restaurant owner said. The owner, who asked not to be named, said he paid $1,000 for a powerful cell phone signal jammer because he was tired of employees focusing on their phones instead of customers.
Any establishment—whether it's a restaurant, bookstore, theater, etc.—should choose whether to allow cell phone use by creating a "dead zone" where wireless reception is unavailable. Besides building a lead box around the building, there should be a way to electronically block wireless communication in a designated area. One approach might be to electronically scramble the appropriate radio wave spectrum. For example, the ability to specify the range of a dead zone would allow a theater to block wireless communication in a projection room while allowing wireless communication in a theater lobby. This would effectively force moviegoers to do the right thing and leave the screening room to use their mobile devices for calls, emails, text messages, or any other activity that requires wireless communication.