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U

UNIT SIZE

The 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 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 [2].


UNTUNED LINE

Another name for the flat or nonresonant line [10].

UP LINK

The frequency used to transmit a signal from earth to a satellite [17].

UPPER SIDEBAND

All of the sum frequencies above the carrier [12].

UPPER-FREQUENCY CUTOFF

The highest frequency a circuit can pass [9].

V

V ANTENNA

A bidirectional antenna, shaped like a V, which is widely used for communications [10].

VACUUM EVAPORATION

Process of producing thin film components [14].

VALENCE

The measure of the extent to which an atom is able to combine directly with other atoms. It generally depends on the number and arrangement of the electrons in the outermost shell of the atom [1].


VALENCE SHELL

The electrons that form the outermost shell of an atom [1].


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