A-SCOPEA radar display on which slant range is shown as the distance along a horizontal trace.
ACQUISITIONOperational phase of a fire- control or track radar during which the radar system
searches a small volume of space in a prearranged pattern.
AIR-CONTROL PANELPanel that monitors the dry-air input at each user equipment.
ALTITUDEVertical distance of an aircraft or object above a given reference, such as ground or sea
AMBIGUOUS RETURNSEchoes that exceed the prt of a radar and appear at incorrect ranges.
AMPLITRONSee Crossed-Field Amplifier.
ANTENNA BEAM WIDTHWidth of a radar beam measured between half-power points
ANTENNA SYSTEMRoutes rf energy from the transmitter, radiates the energy into space, receives
echoes, and routes the echoes to the receiver.
ANTIJAMMING CIRCUITElectronic circuit used to minimize the effects of enemy
countermeasures, thereby permitting radar echoes to be visible on the indicator.
ANTITRANSMIT-RECEIVE TUBE (atr)Tube that isolates the transmitter from the antenna and
receiver. Used in conjunction with tr tube.
ARTIFICIAL TRANSMISSION LINEAn LC network that is designed to simulate characteristics of
a transmission line.
ASYMMETRICAL MULTIVIBRATORMultivibrator that generates rectangular waves.
AUTOMATIC GAIN CONTROLCircuit used to vary radar receiver gain for best reception of signals
that have widely varying amplitudes.
AVERAGE POWEROutput power of a transmitter as measured from the start of one pulse to the start
of the next pulse.
AZIMUTHAngular measurement in the horizontal plane in a clockwise direction.
BALANCED MIXERWaveguide arrangement that resembles a T and uses crystals for coupling the
output to a balanced transformer.
BEARING RESOLUTIONAbility of a radar to distinguish between targets that are close together in
BEAT FREQUENCIESDifference and sum frequencies which result from combining two different