| Abbreviation | Definition |
|---|---|
| RR | Radio Retransmission |
| RRC | Radio Resource Control |
| RRRA | River Raisin Repeater Association |
| RS | Radio Shack |
| RS-422 | Recommended Standard 422 (ANSI/EIA standard for transmitting serial data) |
| RSC | Random Signals and Communications |
| RSCP | Received Signal Code Power |
| RSGB | Radio Society of Great Britain |
| RSL | Restricted Service License |
| RSPP | Radio Spectrum Policy Programme |
| RSQ | Readability, Strength, Quality |
| RSSI | Received Signal Strength Indicator |
| RST | Readability, Strength, and Tone |
| RTA | Radially Tapered Antenna |
| RTCA | Radio Technical Commission for Aeronautics |
| RTCI | Remote Transmitter Control Interface |
| RTS | Radio Test Set |
| RTTY | Radio TeleTYpe |
| RTU | Roof Top Unit |
| RWK | Richardson Wireless Klub |