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As you know, GPS system uses 3 channels L1, L2 and L5. L1 – is a so called civic band and every GPS compatible device uses it. The frequency of L1 is 1575.42 MHz. L2 channel was really developed for military positioning systems, but nowadays lots of civic devices use that frequency too, it is 1227.60 MHz, and the L5 channel is a so called “safety of life” channel and it is to process the information about different dangerous for life situations.
As you can see the sole difference between L1 and L2 compiles up to 350 MHz, and nowadays lots of civil GPS devices use that channel in addition to L1, you can meet also GNSS compatible devices. They use Russian GLONASS positioning system together with GPS.
L2 channel is encrypted. That’s why many people think that it can’t be blocked or jammed. It is wrong Jammer-Store claims that any RF signal can be jammed. So,if you need to jam L2 GPS signal block – use a GPS jammer that is working with 1227.60 MHz, like this GPS L1, L2, L5 jamming device. But beware, evildoers can use such a technology too!
Thanks for your question!