| RA |
Right Ascension |
| RAC |
Random Access Channel |
| RACH |
Random Access Channel |
| Rad |
Radian |
| RADIUS |
Remote Authentication Dial In User Service |
| RAF |
Rate Adjustment Factor |
| RAG |
Request Handling and Assignment Information Generation |
| RAM |
Random Access Memory |
| RAMS |
Reliability, Availability, Maintainability and Safety |
| RAN |
Radio Access Network |
| RARC |
Regional Administrative Radio Conference |
| RAS |
Remote Analysis System |
| RA/TDMA |
Random Assignment TDMA |
| RB |
Reference Burst |
| RBER |
Residual Bit error Rate |
| RBGAN |
Regional Broadband Global Area Network |
| RBID |
Reference Burst Identification Procedure |
| RBW |
Residual Bandwidth |
| RCC |
Radio Common Carrier |
| RCC |
Rescue Control Centre |
| RCP |
Receive Channel Processing |
| RCR |
Return Channel Router |
| RCS |
Reaction Control System |
| RCS |
Return Channel Satellite |
| RCSBD |
Retransmitted Condensed Sub Burst Data |
| RCST |
Return Channel Satellite Terminal |
| RCTP |
Retransmitted Condensed (Burst) Time Plan |
| RCVR |
Receiver |
| RDF |
Repeater Distribution Frame |
| RDG |
Receive Data Gate |
| RDRE |
Rotating Detonation Rocket Engine |
| RDS |
Radio Data System |
| RELP |
Residual Excited Linear Prediction |
| RES |
Radio Equipment and Services |
| RES |
Receive only Earth Station |
| Rev |
Revolution |
| RF |
Radio Frequency |
| RFC |
Request For Comment |
| RFI |
Radio Frequency Interference |
| RfoF |
RF over Fibre |
| RFP |
Request For Proposal |
| RFS |
Radio Frequency Subsystem |
| RFS |
Ready for Service |
| RFS |
Receive Frame Synchronisation Procedure |
| RFT |
Radio Frequency Terminal |
| RFU |
Radio Frequency Unit |
| RFW |
Request For Waiver |
| RGM |
Release Guard Message |
| RHCP |
Right Hand Circular Polarisation |
| RIP |
Routing Information Protocol |
| RIS |
Retransmission Indication Signal |
| RLC |
Radio Link Control |
| RLES |
Regional Land Earth Station |
| RLP |
Return Link Processor |
| RLR |
Return Link Receiver |
| RLV |
Reusable Launch Vehicle |
| RMAC |
Remote Monitor and Control |
| RMBAFN |
Reconfigurable Multibeam Antenna Feed Network |
| rms |
Root Mean Square |
| RMS |
Remote Manipulator System |
| RN |
Reference Noise |
| RNC |
Radio Network Controller |
| R/O |
Receive Only |
| RO |
Receive Only |
| ROC |
Regional Operations Control |
| ROMES |
Receive Only Mobile Earth Station |
| Roomba |
Remotely Operated Orientation and Mass Balance Adjuster |
| rpm |
revolutions per minute |
| rps |
revolutions per second |
| RPS |
Radioisotope Power System |
| RRM |
Radio Resource Management |
| RS |
Reed Solomon |
| RSE |
Register Signalling Equipment |
| RSM |
R2D Line Signalling Module |
| RSO |
Resident Space Object |
| RSP |
Receive Shift Pulse |
| RSS |
Radiodetermination Satellite Service |
| RSS |
Radio Switching Subsystem |
| RTA |
Range Telemetry Amplifier |
| RTCP |
Real Time Control Protocol |
| RTF |
Return To Flight |
| RTG |
Radioisotope Thermoelectric Generator |
| RTLS |
Return To Launch Site |
| RTM |
Redundant Telemetry Module |
| RTP |
Real Time Protocol |
| RTS |
Request To Send |
| RTT |
Radio Transmission Technologies |
| RUD |
Receive Channel Status Update and Overload Channel Decoding |
| RUD |
Rapid Unscheduled Disassembly |
| RX |
Receive, Receiver |
| RxAM |
Received Assignment Message |
| RZ |
Return To Zero |
