Products By Bands
Mobile networks and carriers in United States use 2 GSM bands, 3 UMTS bands, 12 LTE bands, and 3 CDMA bands. In general, cell phone jammer has more the band, the more kinds of signals that can be disturbed, and the greater the range of jammer. If there are a variety of requirements for the jammer frequencies, it is the best choice to choose the jamming device of multi-frequency band. So, how many scientific research institutions with the development of the jammer can interfere with more frequency as the main research topic. The Cellular band occupies 824–849 MHz and 869–894 MHz ranges. To issue cellular licenses, the FCC divided the U.S. into 734 geographic markets called Cellular Market Areas (CMAs) and divided the 40 MHz of spectrum into two, 20 MHz amounts referred to as channel blocks; channel block A and channel block B. A single license for the A block and the B block were made available in each market. The B block of spectrum was awarded to a local wireline carrier that provided landline telephone service in the CMA. The A block was awarded to non-wireline carriers. In 1986, the FCC allocated an additional 5 MHz of spectrum for each channel block, raising the total amount of spectrum per block to the current total of 25 MHz. The 1850–1990 MHz PCS band is divided into six frequency blocks (A through F). Each block is between 10 MHz and 30 MHz in bandwidth. License (A or B) is granted for Major Trading Areas (MTAs). License (C to F) is granted for Basic Trading Areas (BTAs). License (G), where issued, is granted for Economic Areas (EAs). There are 51 MTAs, 493 BTAs and 175 EAs in the United States. Generally speaking, 1-5 band jammers are hand-held jammer, which are small and easy to carry. The 6-16 band jammers is usually a desktop jammer with large block range and stable signal.