U
UART See universal asynchronous receiver/transmitter.
ubitron An amplifier or oscillator in which an undulating electron beam interacts with an rf wave. The kinetic energy of the beam is converted into rf energy (0-type interaction). The undulation of the beam is produced by a periodic magnetic field. This field gives the beam a transverse velocity component that interacts with the rf wave.
U-bolt A U-shaped bolt threaded on both ends, for fastening antennas to masts.
UG The two-letter designation that precedes the number on connectors for coaxial cable. It means Universal Government.
UHF 1. Abbreviation for ultrahigh frequency. 2. In television, a term used to designate channels 14 through 69.
UJT Abbreviation for unijunction transistor. ...
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