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CQ

The two-letter signal, to be used by flags, radiotelephony or radiotelegraphy, meaning "Calling All Ships".



Related Terms

SEARCH AND RESCUE RADAR TRANSPONDER

An electronic device which transmits a homing signal on the radar frequency used by rescue ships and aircraft.

CHALLENGE

A signal transmitted by a interrogator

DISTANT SIGNAL

A signal placed at a distance from a block of track to give advance warning when the block is closed.

GATE

A circuit which has two or more input-signal ports and which delivers an output only if and when every input signal port is simultaneously energized. circuit; passive AND gate.

INJECTION

  1. The method of applying a signal to an electronic circuit or device. 2. The process of introducing electrons or holes into a semiconductor so that their total number exceeds the number present at thermal equilibrium. 3. The introduction of fuel, fuel and air, fuel and oxidizer, water, or other substance into an engine induction system or combustion chamber.

HETERODYNE FREQUENCY METER

A frequency meter in which a known frequency, which 269 heterodyne frequency meter hermetic seal An airtight seal. heterodyne measurement may be adjustable or fixed, is heterodyned with an unknown frequency to produce a zero beat or an audio-frequency signal whose value is measured by other means. Also known as heterodyne wavemeter.

AIDED TRACKING

A system of radar-tracking a target signal in bearing, elevation, or range, or any combination of these variables, in which the rate of motion of the tracking equipment is machine-controlled in collaboration with an operator so as to minimize tracking error.

BOOTSTRAP CIRCUIT

A single-stage amplifier in which the output load is connected between the negative end of the anode supply and the cathode, while signal voltage is applied between grid and cathode; a change in grid voltage changes the input signal voltage with respect to ground by an amount equal to the output signal voltage.

CARBON-PILE PRESSURE TRANSDUCER

A measurement device in which variations in pressure upon a conductive carbon core proportionately change the core's electrical resistance, and thus the strength of the measured electric signal from the device.

GROUNDED-GRID AMPLIFIER

An electrontube amplifier circuit in which the control grid is at ground potential at the operating frequency; the input signal is applied between cathode and ground, and the output load is connected between anode and ground.

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