Adjustable 8 Antennas High Power GPS/ WiFi/ 4G(LTE Wimax) Jammer

Adjustable 8 Antennas High Power GPS/ WiFi/ 4G(LTE Wimax) Jammer

Jamming devices overpower the cell phone by transmitting a
signal on the same frequency and at a high enough power that the two signals
collide and cancel each other out. Cell phones are designed to add power if
they experience low-level interference, so the jammer must recognize and match
the power increase from the phone.

Cell phones are full-duplex devices, which means they use
two separate frequencies, one for talking and one for listening simultaneously.
Some jammers block only one of the frequencies used by cell phones, which has
the effect of blocking both. The phone is tricked into thinking there is no
service because it can receive only one of the frequencies.







Less complex devices block only one group of frequencies,
while sophisticated jammers can block several types of networks at once to head
off dual-mode or tri-mode phones that automatically switch among different
network types to find an open signal. Some of the high-end devices block all
frequencies at once, and others can be tuned to specific frequencies.