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T

TWO-M

(2M)—Miniature/microminiature repair program [14].

TWO-WIRE OPEN LINE

A 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 FREQUENCY

The band of frequencies from 300 megahertz to 3 gigahertz [17].

ULTRASONIC

(1) Sounds above 20,000 hertz [10]. (2) Supersonic.

UNBALANCED CRYSTAL MIXER

A 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].


UNIDIRECTIONAL

In one direction only [1].

UNIDIRECTIONAL ARRAY

An 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].



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