Glossary Terms Beginning R

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Rain climatic zone: See precipitation zone.
Rain outage: Loss of signal due to absorption and increased sky-noise temperature caused by heavy rainfall.
RCD: Residual current device: a device that measures the difference in current flowing between the supply wires; if a difference exists then a fault is assumed and the supply is rapidly disconnected.
Receiver: Rx: device which enables a particular satellite signal to be separated from all others being received by an earth station, and converts the received signal into video and audio.
Redundancy: Protection against failure of either a part or the whole of the system that would thus make the entire system inoperable. In an SNG uplink that is redundant, there are two transmitters and two modulators.
Resolution: Sharpness of the picture.
Restoration: The action of a satellite system operator to sustain defined service level in the event of satellite failure or anomaly.
Return audio; reverse audio: See Cleanfeed.
RF; RF bandwidth: Radio frequency: refers to radio transmissions or relating to that part of the electromagnetic spectrum used for radio transmissions.
RJ-11; RJ-45: Standard types of telephone line connector.
RS.232: Common serial data interface.
RU: Nineteen-inch rack-height unit; See U.
Rx: Receive; receiver.