C band
C-band ("compromise" band) is a portion of electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 6 GHz.C-band is primarily used for satellite communications, normally downlink 3.7-4.2 GHz horizontal, uplink 5.9-6.4 GHz vertical, usually 24 36 MHz transponders on board a satallite.
The applications include full-time satellite TV networks or raw satellite feeds, although subscription programming also exists. There are more than 20 C-band satellites hovering over North America, which provide more than 250 video channels and 75 audio services. Typical antenna sizes on C-band capable systems ranges from 7.5 to 12 feet (2 to 3.5 meters).
This contrasts with direct broadcast satellite, which is a completely closed system used to deliver subscription programming to small satellite dishes connected to proprietary receiving equipment.
C-band is highly associated with TVRO satellite reception systems or "big dish" systems. Larger antennas and more expensive receivers, C-band usually provides better video quality and is less affected by rain attenuation than the Ku band. Contrary to popular belief, digital C-band does in fact exist.
The NATO C-band is defined as frequency band between 0.5-1 GHz (0.3-0.6 m).
See also: communications satellite, Ku band, Ka band, S band