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| R&F | Reach & Frequency |
| R&O | FCC Report & Order in Rulemaking Proceeding |
| RA | Radio Authority (United Kingdom) |
| RA | Radiocommunication Assembly of the ITU (Now WRA) |
| RAB | Radio Advertising Bureau |
| RADAR | Radio Detection & Ranging |
| RADAR | Radio All Dimension Audio Research |
| RADET | Rapid Deployment Earth Terminal for SNG |
| RAEDDF | Radio Assignment Electronic Data Dissemination Format |
| RAG | Radiocommunication Advisory Group (of the ITU RS) |
| RAID | Redundant Arrays of Independent Disks (Computer Technology) |
| RAM | Radio Audience Measurement |
| RAM | Random Access Memory (in computer systems) |
| RARC | Regional Administrative Radio Conference |
| RAS | Radio Astronomy Service |
| RASO | Radio Allocations Study Organization |
| RAST | Radio Standardization |
| RASTI | Rapid Speech Transmission Index |
| RB | Radio Broadcast/Broadcasting |
| RBAF | Radio Bearer Adaptation Functionality |
| RBDS | Radio Broadcast Data System |
| RBER | Residual Bit Error Ratio (digital systems) |
| RBOC | Regional Bell operating Company |
| RBOCs | Regional Bell Operating Companies |
| RBW | Reverse Band Working (Satellite Feeder Links) |
| RC | Resistor-Capacitor Circuit |
| RC | Reverse Charging (of telephone long disntace calls) |
| RCA | Radio Club of America |
| RCC | Radio Common Carrier |
| RCI | Radio Canada International |
| RCL | Remote Control Location |
| RCS | Radio Conference Subcommittee (of the NTIA) |
| R-DAT | Rotating-head Digital Audio Recorder |
| RDBMS | Relational DataBase Management System |
| RDD | Random Digital Dialing (for audience surveys) |
| RDS | Radio Data Service (on FM 57 kHz subcarrier) |
| RDSS | Radio Determination Satellite Service |
| REMA | Radio Electronics Manufacturers Association (Now EIA) |
| REVAL | Recommendation for Evaluation |
| RFA | Regulatory Flexibility Act |
| RFC | Radio Frequency Control |
| RFC | Request For Comments |
| RFE | Radio Free Europe |
| RFG | Radio Frequency Gateway |
| RFI | Radio Frequency Interference |
| RFI | Request for Information |
| RFP | Request for Proposal |
| RFPG | Radio Frequency Protection Guide (ANSI standard) |
| RFR | Radio Frequency Radiation |
| RFS | Radio Frequency Switch |
| RGB | Red-Green-Blue Color Monitor Signal |
| RHC | Regional Holding Company (Telephone sevice providers) |
| RIAA | Recording Industry Association of America |
| RIAS | Radio in American Sector (Berlin) |
| RIS | Reandom Interleaved Sampling |
| RITOIE | Receiver Induced Third Order Intermodulation Effect |
| RL | Radio Liberty |
| RLC | Resistor-Inductor-Capacitor Circuit |
| RLP | Radio Link Protocol |
| RMA | Radio Manufacturers Assocation (changed to REMA now EIA) |
| RMON | Remote MOnitoring Network protocols |
| RMS | Root Mean Square |
| RMT | Required Monthly Test (for EAS operations) |
| RN | Radio Nederland (Dutch international broadcast service) |
| RNA | Radio Network Association |
| RNC | Radio Network Controller (BSC for UMTS) |
| RO | Receive-Only Earth Terminal |
| ROI | Return on Investment |
| ROM | Read Only Memory (in computer systems) |
| ROS | Run of Schedule |
| ROSP | Report on Syndicated Programs |
| ROW | Right(s) of Way |
| RP | Radio Paging |
| RP | Rear Projection |
| RP | Restricted [FCC Radiotelephone Operator] Permit |
| RPN | Reverse Polish Notation (calculation method) |
| RPS | Recording & Playback System |
| RPU | Remote Pickup Unit |
| RRB | Radio Regulations Board (of the ITU) |
| RRWG | Radio Regulatory Working Group (of CEPT) |
| RS | Radiocommunication Sector (of the ITU. Replaces CCIR) |
| RSG | Radiocommunication Study Group (of the ITU RS) |
| RSO | Regional Standards Organization |
| RSS | Root Sum Square |
| RTAF | Radio Transmission Adaption Functionality |
| RTCA | Radio-Television Correspondents Association |
| RTD | Resistance Temperature Detector |
| RTES | Radio & Television Executives Society |
| RTLC | Radio Technical Liaison Committee (U.S./Canada coordination) |
| RTNDA | Radio & Television News Directors Association |
| RTRC | Radio & Television Research Council |
| RTT | Radio Transmission Technologies |
| RTT | Radio Transmission Technology |
| RTTY | Radio Teletypewriter Terminal |
| RWT | Required Weekly Test (for EAS operations) |
| RWWG | Report Writing Working Group |
| RX | Radio Receiver |