Wednesday, 1 May 2024, 3:59 PM
Site: edulabs.org academy
Course: Activity Examples (Activity Examples)
Glossary: Electronics (Mike Jaroch)
T
TWO-M(2M)—Miniature/microminiature repair program [14]. |
TWO-WIRE OPEN LINEA parallel line consisting of two wires that are generally spaced from 2 to 6 inches apart by insulating spacers [10]. |
TWO-WIRE RIBBON(TWIN LEAD)—A parallel two-wire line in which uniform spacing is assured by two wires imbedded in a low-loss dielectric [10]. |
U
ULTRAHIGH FREQUENCYThe band of frequencies from 300 megahertz to 3 gigahertz [17]. |
ULTRASONIC(1) Sounds above 20,000 hertz [10]. (2) Supersonic. |
UNBALANCED CRYSTAL MIXERA circuit consisting of a section of coaxial transmission line one-half wavelength long that is tuned to the difference (intermediate) frequency between the local oscillator and RF echo signals [18]. |
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]. |