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Wednesday, November 3, 2010

U

ULP. Upper Level Protocol.

ULTRAHIGH FREQUENCY. The band of frequencies from 300 megahertz to 3 gigahertz.

ULTRASONIC. Sounds above 20,000 hertz. Supersonic.

UMOS. A type of MOS [Metal-Oxide-Semiconductor] FET [Field Effect Transistor].

UNIDIRECTIONAL. In one direction only.

UNIJUNCTION TRANSISTOR (UJT). A three-terminal, semiconductor device

UNIT. A single object or thing.

UPPER-FREQUENCY CUTOFF. The highest frequency a circuit can pass.

UPPER SIDEBAND. All of the sum frequencies above the carrier.

USB. Universal Serial Bus, a computer bus which provides two-way communication between the PC and peripheral devices

UXGA. Ultra Extended Graphics Array. A video resolution of 1600 x 1200 pixels

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