| RA |
(Working Group) Radio Regulations (ECC) |
| RA |
Radiocommunication Assembly (ITU) |
| RA |
Radio Astronomy Service (ITU) |
| RADAR |
Radio Detecting and Ranging |
| RAG |
Radiocommunication Advisory Group (ITU) |
| RARC |
Regional Administrative Radio Conference (ITU) |
| RAS |
Radio Astronomy Service |
| RAS |
Royal Astronomical Society (GB) |
| RB |
Radiocommunication Bureau (ITU) |
| RD |
Radiodetermination Service |
| RDS |
Radiodetermination Service |
| RDSS |
Radio Determination Satellite Service |
| REC |
Recommendation |
| REGTP |
Regulatory Authority for Telecommunications and Post (D) |
| RFI |
Radio Frequency Interference |
| RFID |
Radio Frequency Identification |
| RHC |
Right Hand Circular |
| RIN |
Royal Institute of Navigation (GB) |
| RIS |
Radiocommunication Information Systems Department (ITU) |
| RL |
Radiolocation Service |
| R-LAN |
Radio Local Area Network |
| RLS |
Radiolocation Service |
| RN |
Radionavigation Service |
| RNS |
Radionavigation Service |
| RNSS |
Radionavigation-Satellite Service |
| RR |
ITU-R Radio Regulations (ITU) |
| RRB |
Radio Regulations Board (ITU) |
| RRC |
Regional Radiocommunication Conference (ITU) |
| RSBN |
Radiolocation System for Short Range Navigation (Abbreviation stands for the Russian term) |
| RSC |
Radio Spectrum Committee (EC) |
| RSPG |
Radio Spectrum Policy Group (EC |
| RTAGS |
Radio Tags |
| RTCA |
Radio Technical Commission for Aeronautics (USA) |
| RTT |
Road Transport Telematics |
| RTTE |
Radio and Telecommunications Terminal Equipment (Directive) |
| RTTT |
Road Transport & Traffic Telematics |
Committee on Radio Astronomy Frequencies