UHF

The spectrum 300 MHz through 3 GHz. Terrestrial broadcasts television occupies 470-890 MHz. The 620-790 MHz band is allocated for community DSS downlinks in developing countries and remote areas.

UL

Abbreviation for Underwriters Laboratodes, a nonprofit independent organization, which operates a listing service for electrical and electronic materials and equipment.

Upconverter

A device that increases the frequency of a transmitted signal.

Uplink

The earth station electronics and antenna which transmit information to a communication satellite.

UT

Universal Time. Same as GMT.