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Hi there, Felicia! It is not a secret and there’s a lot of information can be found on the Internet. Basically all the signal blockers you may see at are active signal disruptors. Those devices create an interference field at the specified frequency by emitting them themselves. So, if you want to block a cell phone, for example, you’ll need your device to emit signals at the 850/1900 MHz frequency. Those interfering signals carry no information. In a matter of fact we’ve already published a how-to guide on making your own blocker. We’ve also attached some schematics to it, you can find the links at the end of that page. Their construction is pretty simple. Basically, every signal blocking device contain power source, voltage controlled oscillator, RF amplifier, noise source and transmitting antenna. If you wish you can make your device more complicated and flexible by adding additional modules to its construction, like tunning circuit. We may tell you that the hardest part here is to adjust the right frequency of your remote control jammer. You should know that the most widely spread RF remote controls are using 433, 868 and 315 MHz frequency. SO to block them all you will have to make sure that your remote control blocker works in those 3 frequency bands. But if require a specific device for some specific goal we should tell you that 433 and 315 MHz is used mostly in car alarms, while 868 MHz is used for smarthome systems and radio controlled toys. That specific kind of a signal jamming devices is rather safe, I mean you will not be able to block some of critical communications with that. Thanks for your question and good luck in constructing your own jamming device!

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