DIY a simple cell phone blocker

Posted on 24th Sep 2013 @ 12:31 PM

Before the appearance of cell phone blocker, people have been looking for such anti-spy jamming device for a long time. Years later, the cell phone signal jamming blockers were invented for the purpose of military security. They are originally applied by the police and military to control or disrupt communication during hostage situations and bomb threats. With the wide spread of cell phone jamming blockers, they are now not only applied in military area, but also in many public places as well as private places. The phone jammers help people a lot in getting rid of the disturbances of mobile phones. Are you planning to DIY a simple cell phone blocker for yourself? This paper will give you more instructions.

Before you make phone blockers, you should know their working principles. For example, you can make a GSM800 mobile phone jammer since most of the mobile phones all around the world working on this frequency. So the first step is to choose the sweeping oscillator as your VCO, which is very effective but may be hard to construct for the beginners without some semi-professional RF-testing tools. As a noise source you can use 45MHz clock oscillator which is driving Local Oscillator port located on a mini-circuit mixer. To equate the impedance of a clock oscillator with the mixer there is an impedance matching network. Local oscillator signal goes through this network and impedance is matched. Then, RF input, which is this port of the mixer, connected to the first 800MHz cell phone antenna, The RF output then goes to the amplifier located on the mini circuit. The amplifier will increase produced output by 15-16dbm of pure power. The amplified signal then sent to the second cell phone antenna.

How does this DIY mobile phone jammer work? As we’ve mentioned the GSM800 is the most popular band for cell phones. This DIY Cell phone blocker has its transmitted frequency always separated exactly by 45MHz from its received frequency. So when the mobile phone tries to call it is blocked by its own signal returning to it! Isn't that cool? When there is someone blabbers around you, just turn your jammer on and you will turn back to peace again.

Don't you just hate it when you go to the movies and someone's phones ringing all the time? Even if they don't answer it, the sudden phone calls just killed the atmosphere. If you've ever wanted to ensure your movie-going experience remains undisturbed, you might want to check this out. Apparently a cell phone blocker can help you out of such trouble. You can DIY one for yourself according to our instructions. If you think it is too hard for you to DIY a cell phone signal jammer or you prefer to buy one, you can find the best phone jammer online sales at Jammerall.