Not all GPS jammers can block cell phone signals
Some friends ask: Why do car gps jammer still block cell phone signals? Is GPS signal related to cell phone signal? First of all, this statement is actually inaccurate, because not all GPS jammers block cell phone signals.
The initial car GPS jammer was just a "crook", directly plugged into the cigarette lighter, when the car is started, there is power supply, it can shield the GPS signal. Later, it evolved into a GPS jammer with 1 antenna. In addition to being charged and used in the car, it also has a lithium battery and can work normally for a period of time on its own power.
A further step is the GPS jammer with two antennas, which shield the GPS frequency band and the Beidou frequency band respectively. The above are pure car GPS signal jammers and do not shield cell phone signals. But on this basis, there are three-antenna, four-antenna, six-antenna, and eight-antenna handheld car GPS signal jammers. In addition to the GPS frequency band, it can also shield 2G3G4G and WiFi signals, making the function more powerful.
Of course, in today's market, three or four antennas are relatively rare. Except for pure GPS jammers with two antennas, machines with six antennas and eight antennas have become the mainstream. Please note that these GPS jammers mentioned above are all hand-held, relatively small, with their own lithium battery, which can work for several hours even when the power is off. You can even carry the six-antenna and eight-antenna jammers with you to isolate the influence of external signals when negotiating in some private situations-this is because they can shield mobile phones and WiFi signals.
Finally, in addition to these handheld GPS signal jammers, there is also a desktop GPS jammer with larger volume and stronger performance, with 8 or 9 antennas, and full coverage of GPS signals and mobile phone signals. It does not have a lithium battery itself, and relies entirely on charging. It can work with 220V alternating current in the parking lot or with a 12V power supply in the car.
This device also has an adjustable knob, which can only shield GPS signals or mobile phone signals according to the needs of use. After reading the above, do you have a better understanding of GPS jammers? Xi'an Kaining Electronics has focused on the shielding industry for ten years, welcome to consult and understand.