| Abbreviation | Definition |
|---|---|
| STBX | Soon-To-Be Ex |
| STF | Single Tuning Frequency |
| STK | Single Tone Keying |
| STKE | Signal Transduction Knowledge Environment |
| STLV | St. Louis Vertical antenna |
| SUARC | SU Amateur Radio Club |
| SURGE | Southampton University Radio from Glen Eyre |
| SVA | Symmetrical Vertical Array |
| SW | Short Wave |
| SWARC | Steubenville Weirton Amateur Radio Club |
| SWB | ShortWave Band |
| SWI | ShortWave Interference |
| SWL | Short Wave Listener |
| SWR | Standing Wave Ratio |
| SYL | Sweet Young Lady |
| SZZ | Super Zig-Zag Antenna |
| SZZP | Super Zig-Zag Panel Antenna |
| TARC | Trident Amateur Radio Club |
| TARC | Turlock Amateur Radio Club |
| TARPN | Terrestrial Amateur Radio Packet Network |