1-14 CONTROL-GRID MODULATOR—Uses a variation of grid bias to vary the instantaneous plate voltage and current. The modulating signal is applied to the control grid [12]. CONTROL SYNCHRO SYSTEMS—Synchro systems that contain control synchros and are used to control large amounts of power with a high degree of accuracy. The electrical outputs of these systems control servosystems, which in turn generate the required power to move heavy loads [15]. CONTROL SYSTEM—A group of components systematically organized to perform a specific control purpose. These systems are categorized as either closed- or open-loop systems. The main difference between the two is that the closed-loop system contains some form of feedback [15]. CONTROL TRANSFORMER (CT)—A type of synchro that compares two signals: the electrical signal applied to its stator and the mechanical signal applied to its rotor. The output is an electrical voltage, which is taken from the rotor winding and is used to control a power-amplifying device. The phase and amplitude of the output voltage depends on the angular position of the rotor with respect to the magnetic field of the stator [15]. CONTROL TRANSMITTER (CX)—A type of synchro that converts a mechanical input, which is the angular position of its rotor, into an electrical output signal. The output is taken from the stator windings and is used to drive either a CDX or CT [15]. CONVERTER—In communications, equipment that changes the audio output of a receiver to dc pulses. These pulses are fed to a tty to indicate marks and spaces [17]. COOKIE-CUTTER TUNER—A mechanical magnetron tuning device that changes the frequency by changing the capacitance of the anode cavities [11]. COPPER LOSS (I2R LOSS)—The power lost because of the resistance of the conductors. In transformersthe power lost because of current flow (I) through the resistance (R) of the windings [2] [10] [11]. CORDWOOD MODULE—A method of increasing the number of discrete components in a given space. Resembles wood stacked for a fireplace [14]. CORE—Any material that affords a path for magnetic flux lines in a coil [2]. CORNER-REFLECTOR ANTENNA—A half-wave antenna with a reflector consisting of two flat metal surfaces meeting at an angle behind the radiator [10] [18]. CORONA—The discharge of electricity from a conductor with a high potential [4]. CORRECTIVE MAINTENANCE—Includes location and repair of equipment failures [16]. CORRESPONDENCE—The term given to the positions of the rotors of a synchro transmitter and a synchro receiver when both rotors are on 0 degree or displaced from 0 degree by the same angle [15]. COULOMB—A measure of the quantity of electricity. One coulomb is equal to 6.28 x 1018electrons [1]. COULOMB'S LAW—Also called the LAW OF ELECTRIC CHARGES or the LAW OF ELECTROSTATIC ATTRACTION. Coulomb's Law states that charged bodies attract or repel each other with a force that is directly proportional to the product of their individual charges and inversely proportional to the square of the distance between them [1]. COUNTER—A circuit that counts input pulses [9].
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