C band.

C band. As used in this part, the terms C band and conventional C band refer to the 3700-4200 MHz (space-to-Earth) and 5925-6425 MHz (Earth-to-space) bands. These paired bands are allocated to the Fixed-Satellite Service and are also referred to as the 4/6 GHz bands.

Source

47 CFR § 25.103

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Scoping language

Terms with definitions including the (RR) designation are defined in the same way in 2.1 of this chapter and in the Radio Regulations of the International Telecommunication Union.

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