CONTROL-GRID MODULATORUses a variation of grid bias to vary the instantaneous plate voltage
and current. The modulating signal is applied to the control grid .
CONTROL SYNCHRO SYSTEMSSynchro 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 .
CONTROL SYSTEMA 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 .
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 .
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 .
CONVERTERIn 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 .
COOKIE-CUTTER TUNERA mechanical magnetron tuning device that changes the frequency by
changing the capacitance of the anode cavities .
COPPER LOSS (I2R LOSS)The power lost because of the resistance of the conductors. In transformers
the power lost because of current flow (I) through the resistance (R) of the windings   .
CORDWOOD MODULEA method of increasing the number of discrete components in a given space.
Resembles wood stacked for a fireplace .
COREAny material that affords a path for magnetic flux lines in a coil .
CORNER-REFLECTOR ANTENNAA half-wave antenna with a reflector consisting of two flat metal
surfaces meeting at an angle behind the radiator  .
CORONAThe discharge of electricity from a conductor with a high potential .
CORRECTIVE MAINTENANCEIncludes location and repair of equipment failures .
CORRESPONDENCEThe 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 .
COULOMBA measure of the quantity of electricity. One coulomb is equal to 6.28 x 1018 electrons .
COULOMB'S LAWAlso 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 .
COUNTERA circuit that counts input pulses .