CONVENTIONAL SIGNALS.--See Signals, Conventional.
COUNTER ELECTROMOTIVE FORCE.--See Electromotive Force, Counter.
COUNTERPOISE. A duplicate of the aerial wire that is raised a few feet above the earth and insulated from it. Usually no connection is made with the earth itself.
COUPLED CIRCUITS.--See Circuit, Coupled.
COUPLING.--When two oscillation circuits are connected together either by the magnetic field of an inductance coil, or by the electrostatic field of a condenser.
COUPLING, CAPACITIVE.--Oscillation circuits when connected together by condensers instead of inductance coils.
COUPLING, COEFFICIENT OF.--The measure of the closeness of the coupling between two coils.
COUPLING, INDUCTIVE.--Oscillation circuits when connected together by inductance coils.
COUPLING, RESISTANCE.--Oscillation circuits connected together by a resistance.
CRYSTAL RECTIFIER.--A crystal detector.