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C band
From Wikipedia, the free encyclopedia
| ITU Radio Band Numbers |
| ITU Radio Band Symbols |
| NATO Radio bands |
| IEEE Radar bands |
C band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 8 GHz.[1]. It was the first frequency band allocated for commercial ground-to-satellite communications. A typical C-band satellite uses 3.7–4.2 GHz for downlink, and 5.925–6.425 Ghz for uplink.
C band is primarily used for open satellite communications, whether for full-time satellite TV networks or raw satellite feeds, although subscription programming also exists. This use 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, commonly called "big dish" systems since small receiving antennas are not optimal for C-band systems. Typical antenna sizes on C-band capable systems ranges from 7.5 to 12 feet (2.5 to 3.5 meters) on consumer satellite dishes, although larger ones also can be used.
The 5.4GHz band (5.15–5.35/5.47–5.725/5.725–5.875 GHz) is used for IEEE 802.11a WIFI and cordless phone applications, leading to occasional interference with C-band weather radars.
Slight variations of C band frequencies are approved for use in various parts of the world.
| C-Band variants around the world | ||
| Band | Tx Frequency | Rx Frequency |
| Extended C-Band | 5.850–6.425 GHz | 3.625–4.200 GHz |
| Super Extended C-Band | 5.850–6.725 GHz | 3.400–4.200 GHz |
| INSAT C-Band | 6.725–7.025 GHz | 4.500–4.800 GHz |
| Palapa C-Band | 6.425–6.725 GHz | 6.425–6.725 GHz |
| Russian C-Band | 5.975–6.475 GHz | 3.650–4.150 GHz |
| LMI C-Band | 5.7250–6.025 GHz | 3.700–4.000 GHz |
- ^ Peebles, Peyton Z. Jr, (1998), Radar Principles, John Wiley and Sons, Inc., p 20.
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