Electronics (Mike Jaroch)
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ULTRAHIGH FREQUENCYThe band of frequencies from 300 megahertz to 3 gigahertz [17]. | ||
ULTRASONIC(1) Sounds above 20,000 hertz [10]. (2) Supersonic. | ||
UNIDIRECTIONALIn one direction only [1]. | ||
UNIDIRECTIONAL ARRAYAn antenna array that radiates in only one general direction [10]. | ||
UNIJUNCTION TRANSISTOR(UJT)—A three-terminal, semiconductor device with a negative resistance characteristic that is used in switching circuits, oscillators, and wave-shaping circuits [7] | ||
UNIT(1) An assembly or any combination of parts, subassemblies, and assemblies mounted together. Normally capable of independent operation [17]. (2) A single object or thing [13]. | ||
UNIT SIZEThe standards adopted to make comparisons between things of like value (for example, the unit size for conductors is the mil-foot) [4]. | ||
UNIVERSAL TIME CONSTANT CHARTA chart used to find the time constant of a circuit if the impressed voltage and the values of R and C or R and L are known [2]. | ||
UNTUNED LINEAnother name for the flat or nonresonant line [10]. | ||