MONOPULSE RADARA radar that gets the range, bearing, and elevation position data of a target from
a single pulse .
MONOPULSE RECEIVERSee MONOPULSE RADAR .
MONOSTABLE MULTIVIBRATORA multivibrator that has one steady state. A signal (trigger) must
be applied to cause change of states .
MOSFETA 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 .
MOST SIGNIFICANT DIGIT (MSD)The MSD is the digit whose position within a given number
expression has the greatest weighting power .
MOTORA machine that converts electrical energy to mechanical energy. It is activated by ac or dc
voltage, depending on the design .
MOTOR LOADAny 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 .
MOTOR REACTIONThe force created by generator armature current that tends to oppose the normal
rotation of the armature .
MOTOR STARTERSLarge 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 .
MOVING-IRON METER MOVEMENTSame as MOVING-VANE METER MOVEMENT .
MOVING TARGET INDICATORA device that limits the display of radar information to moving
MOVING-VANE METER MOVEMENTA 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 .
MSDSee MOST SIGNIFICANT DIGIT .
MTDSAn abbreviation for the marine tactical data system .
MUSymbol for amplification factor  .
MULTICONDUCTORMore than one conductor, as in a cable .
MULTICOUPLERSCouplers that patch receivers or transmitters to antennas. They also filter out
harmonics and spurious responses and impedance-match the equipment .
MULTIELECTRODE TUBEAn electron tube normally classified according to its number of electrodes
(the multielectrode tube contains more than three electrodes) .
MULTIELEMENT ARRAYAn array that consists of one or more arrays and is classified as to