RF & Noise Components



GSM is an abbreviation of 'Global System for mobile communications'. GSM was seen as a significant improvement over pre-existing mobile network systems as both speech and signalling channels are digital and came to be known as a 2G (Second Generation) system. Using digital modulation for both voice and signal enabled much easier integration of data communications. More.

GSM uses a network of base stations to cover an area allowing mobile phones (cell phones in USA) to connect to and route the call. The base stations can be located in a number of areas depending on the type. There are five types and generally located in the following places as depicted in the table below.

  • GSM-900 uses 890-915 MHz for the uplink and 935-960 MHz for the downlink.
  • E-GSM uses 880-915 MHz for the uplink and 925-960 MHz for the downlink.
  • GSM-1800 uses 1710-1785 MHz for the uplink and 1805-1880 MHz for the downlink.

In the USA, Canada and some South America countries GSM-850 and GSM-1900 are used

  • GSM-850 uses 824-849 MHz for the uplink and 869-894 for the downlink.
  • GSM-1900 uses 1850-1910 MHz for the uplink and 1930-1990 MHz for the downlink.

Our Products

RF & Noise Components have a number of circulator products that have been designed for use in GSM communication systems. This includes a range of coaxial, drop in and surface mount solutions with various other options including power monitors, heat-sinks and cable assemblies