Electronics (Mike Jaroch)
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The band of frequencies from 300 megahertz to 3 gigahertz .
(1) Sounds above 20,000 hertz . (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 .
In one direction only .
An antenna array that radiates in only one general direction .
(UJT)—A three-terminal, semiconductor device with a negative resistance characteristic that is used in switching circuits, oscillators, and wave-shaping circuits 
(1) An assembly or any combination of parts, subassemblies, and assemblies mounted together. Normally capable of independent operation . (2) A single object or thing .
The standards adopted to make comparisons between things of like value (for example, the unit size for conductors is the mil-foot) .
UNIVERSAL TIME CONSTANT CHART
A 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 .
Another name for the flat or nonresonant line .