Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

U

UHF

Ultra High Frequency. (300 to 3 000 MHz)

UPS

Uninterruptible Power Supply.

USB

Upper Sideband mode of emission. A form of single sideband emission where only the upper sideband is transmitted.

UTC

Temps Universel Coordonné (French). Coordinated Universal time (replaces Greenwich Mean Time (GMT) for practical purposes).