| Abbreviation | Definition |
|---|---|
| TXO | Transmit Oscillator |
| TYVM | Thank You Very Much |
| UARC | University Amateur Radio Club |
| UARC | Utah Amateur Radio Club |
| UARFCN | UTRA (UMTS Terrestrial Radio Access) Absolute Radio Frequency Channel Number |
| UBA | Unlicesed Band Antenna |
| UHS | Unit Home Station |
| UHX | UHF Transmitter |
| UKW | Ultra-Kurz Welle (Ultra-Short Wave) |
| USN | United States Navy |
| UTZ | Utilize |
| UWB | Ultra Wide-Band |
| V | Varying |
| VAR | Visual-Aural Range |
| VBY | Vermilion Bay amateur radio repeater |
| VCA | Voltage Controlled Amplifier |
| VCY | Vincinity |
| VEC | Volunteer Examiner Coordinator |
| VFO | Variable Frequency Oscillator |
| VFSS | Valley Forge Signal Seekers |