How to Buy a Mobile Phone Signal Jammer?
1. Determin your local wireless network frequency. Such as, in North America, GSM operates on the primary mobile communication bands 850 MHz and 1900 MHz. In Africa, Europe, Middle East and Asia most of the providers use 900 MHz and 1800 MHz bands.
2. Determin your local wireless communications service providers. In America, the six largest are Verizon (GSM CDMA CDMA2000 LTE, etc), AT&T(GSM UMTS WCDMA, etc), Sprint(CDMA, iDEN), T-Mobile USA(GSM UMTS WCDMA, etc), TracFone Wireless, and MetroPCS. You can also invite the Wireless Advisor website
, it can be a useful source of information on the frequency Verizon is using in your area.
3. Determin how much area you need the cell phone jammer to cover.
How Cellular Phone Signal Blockers Work?
Cell phones are basically handheld two-way radios. And like any radio, the signal can be disrupted, or jammed. In other words, to jam a cell phone, all you need is a device that broadcasts on the correct frequencies what we call Cell Phone Jammer. A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. When used, the jammer effectively disables cellular phones. Although different cellular systems process signals differently, all cell-phone networks use radio signals that can be interrupted. Jammers can broadcast on any frequency and are effective against AMPS, CDMA, TDMA, GSM, PCS, DCS, iDEN and Nextel systems.
How to DIY a Cell Phone Jammer?
To make a nice operating cell phone jammer you will need some details to combine. •Voltage Controlled Oscillator (VCO) •Tuning Circuit (to select desirable frequency to be jammed) •Noise Source (commonly built-in in Tuning Circuit) •RF Amplification Unit (so-called “gain stage”) •Transmitting Antenna. VCO is the most important among other parts. It is like a heart of your jammer.
Tuning Circuit can be of two types: open-loop and feedback. Open-loop is quite simple and requires just a few op-amps with additional passive components. It is a sawtooth-wave generator which makes VCO to go from lowest to highest frequency. The feedback is using PLL to adjust the VCO’s frequency constantly. For this purpose you need to use microcontroller. It is programmed once and then connected to the VCO, thus it is not adjustable. RF Amplification Unit is what you need when you wish to increase the area covered by your jammer along with its signal blocking power. The more power has your signal blocker, the bigger radius it jams. The cost is, as you may guess, battery working time. More power equals less time for battery to live. There is a huge selection of gain stage units on the electronics market (7dbm, 17dbm, even 20+dbm).
Transmitting Antenna is a tool which transmits signals produced by your jammer. The main characteristic of antenna is VSWR (Voltage Standing Wave Ratio). If your antenna has VSWR of 3 or lower, then this is what you need, because the return loss of this antenna is minimal.
Power Source makes your creation to become alive. Generally mobile phone jammers use 5VDC to operate. Thus you may use Lithium-ion battery to supply your creation. In the case of using common power source you will need power adapter. The power adapter may be of one of two types: switched-capacitor voltage doubler or inductor-based boost regulator. The first one is simple and efficient yet not regulated solution, so you will need LDO regulator to fix the voltage. The second one is regulated but it has bigger cost, more complex and requires precise specification of all components to work properly. And now work is done, how do you like it?
Where to Buy a Cell Phone GPS Jammer?
Since these jammers actively broadcast radio signals they may or may not be legal to possess or operate based on the specific laws, jammerspot is a nice choice to find your jammers. 1-Year Warranty + 30-Day Money Back Guarantee