C band is a portion of the electromagnetic spectrum in the
microwave range of frequencies ranging from 4 to 8 GHz.. 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.
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Colloquially, a
frequency band between 4 GHz and 6 GHz used in
satellite communications. Note 1: For
procurement purposes, the
radio frequency band(s) must be specified using the upper and lower limits of the band, per 47 CFR 300. Note 2: Letter designators of radio frequency bands are imprecise, deprecated, and legally obsolete.
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