Neets Master Glossary

1-46 MONOPULSE RADAR—A radar that gets the range, bearing, and elevation position data of a target from a single pulse [18]. MONOPULSE RECEIVER—See MONOPULSE RADAR [18]. MONOSTABLE MULTIVIBRATOR—A multivibrator that has one steady state. A signal (trigger) must be applied to cause change of states [9]. MOSFET—A semiconductor device that contains diffused source and drain regions on either side of a P- or N-channel area. Also contains a gate insulated from the channel area by silicon-oxide. Operates in either the depletion or the enhancement mode [7]. MOST SIGNIFICANT DIGIT (MSD)—The MSD is the digit whose position within a given number expression has the greatest weighting power [13]. MOTOR—A machine that converts electrical energy to mechanical energy. It is activated by ac or dc voltage, depending on the design [5]. MOTOR LOAD—Any device driven by a motor. Typical loads are drills, saws, water pumps, rotating antennas, generators, and so forth. The speed and power capabilities of a motor must be matched to the speed and power capabilities of the motor load [5]. MOTOR REACTION—The force created by generator armature current that tends to oppose the normal rotation of the armature [5]. MOTOR STARTERS—Large resistive devices placed in series with dc motor armatures to prevent the armature from drawing excessive current until armature speed develops counter emf. The resistance is gradually removed from the circuit either automatically or manually as motor speed increases [5]. MOVING-IRON METER MOVEMENT—Same as MOVING-VANE METER MOVEMENT [3]. MOVING TARGET INDICATOR—A device that limits the display of radar information to moving targets [18]. MOVING-VANE METER MOVEMENT—A meter movement that uses the magnetic repulsion of the like poles created in two iron vanes by current through a coil of wire; most commonly used movement for ac meters [3]. MSD—See MOST SIGNIFICANT DIGIT [13]. MTDS—An abbreviation for the marine tactical data system [17]. MU—Symbol for amplification factor [6] [7]. MULTICONDUCTOR—More than one conductor, as in a cable [4]. MULTICOUPLERS—Couplers that patch receivers or transmitters to antennas. They also filter out harmonics and spurious responses and impedance-match the equipment [17]. MULTIELECTRODE TUBE—An electron tube normally classified according to its number of electrodes (the multielectrode tube contains more than three electrodes) [6]. MULTIELEMENT ARRAY—An array that consists of one or more arrays and is classified as to directivity [10].