1-82 VERTICAL DEFLECTION PLATES—A pair of parallel electrodes in a CRT that moves the electron beam up and down [6]. VERTICAL PATTERN—The part of a radiation pattern that is radiated in the vertical plane [10]. VERTICAL PLANE—An imaginary plane that is perpendicular to the horizontal plane [11] [18]. VERTICALLY POLARIZED—Waves that are radiated with the E field component perpendicular to the earth's surface [10]. VERY HIGH FREQUENCY—The band of frequencies from 30 megahertz to 300 megahertz [17]. VERY LARGE SCALE INTEGRATION (vlsi)—An integrated circuit containing over 2,000 logic gates or 64,000 bits of memory [14]. VERY LOW FREQUENCY—The band of frequencies from 3 kilohertz to 30 kilohertz [17]. VIDEO AMPLIFIER—An amplifier designed to amplify the entire band of frequencies from 10 hertz (10 Hz) to 6 megahertz (6 MHz). Also called a WIDE-BAND AMPLIFIER [8]. VIDEO ENHANCEMENT FEATURES—See ANTIJAMMING CIRCUITS [18]. VINCULA—Plural of vinculum (see below) [13]. VINCULUM—A straight horizontal line placed over one or more members of a compound logic expressionto negate or complement. Also, used to join two or more members together [13]. VIRTUAL GROUND—A point in a circuit that is at ground potential (0 V) but is not connected to ground [8]. VOLT—The unit of electromotive force or electrical pressure. One volt is the pressure required to send 1 ampere of current through a resistance of 1 ohm [1]. VOLTAGE—(1) The term used to signify electrical pressure. Voltage is a force that causes current to flow through an electrical conductor. (2) The voltage of a circuit is the greatest effective difference of potential between any two conductors of the circuit [1]. VOLTAGE AMPLIFIER—An amplifier in which the output-signal voltage is greater than the input-signal voltage [8]. VOLTAGE-DIODE DETECTOR—A series-diode detector in which the diode is in series with the input voltage and the load impedance [12]. VOLTAGE DIVIDER—A series network in which desired portions of the source voltage may be tapped off for use in the circuit [1]. VOLTAGE DROP—The difference in voltage between two points. It is the result of the loss of electrical pressure as a current flows through a resistance [1] [4]. VOLTAGE-FEED METHOD—Same as END-FEED METHOD [10]. VOLTAGE GAIN—The ratio of output voltage to input voltage in an amplifier [6]. VOLTAGE MULTIPLIERS—Methods of increasing voltages; used primarily where low current is required [7].