CHARACTERISTICS.--The special behavior of a device, such as an aerial, a detector tube, etc.
CHARACTERISTICS, GRID.--See Grid Characteristics.
CHOKE COILS.--Coils that prevent the high voltage oscillations from surging back into the transformer and breaking down the insulation.
CHOPPER MODULATION.--See Modulation, Chopper.
CIRCUIT.--Any electrical conductor through which a current can flow. A low voltage current requires a loop of wire or other conductor both ends of which are connected to the source of current before it can flow. A high frequency current will surge in a wire which is open at both ends like the aerial.
- Closed Circuit.--A circuit that is continuous.
- Open Circuit.--A conductor that is not continuous.
- Coupled Circuits.--Open and closed circuits connected together by inductance coils, condensers or resistances. See coupling.
- Close Coupled Circuits.--Open and closed circuits connected directly together with a single inductance coil.
- Loose Coupled Circuits.--Opened and closed currents connected together inductively by means of a transformer.
- Stand-by Circuits.--Also called pick-up circuits. When listening-in for possible calls from a number of stations, a receiver is used which will respond to a wide band of wave lengths.
- Armstrong Circuits.--The regenerative circuit invented by Major E. H. Armstrong.
CLOSE COUPLED CIRCUITS.--See Currents, Close Coupled.
CLOSED CIRCUIT.--See Circuit, Closed.
CLOSED CORE TRANSFORMER.--See Transformer, Closed Core.
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