Neets Master Glossary

1-47 MULTIELEMENT PARASITIC ARRAY—An array that contains two or more parasitic elements and a driven element [10]. MULTILOOP SERVOSYSTEM—A servosystem that contains more than one servo loop; each loop is designed to perform its own function [15]. MULTIMETER—A single meter combining the functions of an ammeter, a voltmeter, and an ohmmeter [3]. MULTIPATH—The multiple paths a radio wave may follow between transmitter and receiver [10]. MULTIPHASE—See POLYPHASE [5]. MULTIPLICATION FACTOR—The number of times an input frequency is multiplied [12]. MULTIPLEXING—A method for simultaneous transmission of two or more signals over a common carrier wave [17]. MULTISPEED SYNCHRO SYSTEMS—Systems that transmit data at different transmission speeds; for example, dual-speed and tri-speed synchro systems [15]. MULTIUNIT TUBE—An electron tube containing two or more units within the same envelope. The multiunit tube is capable of operating as a single-unit tube, or each unit can operate as a separate tube [6]. MULTIVIBRATOR—A form of relaxation oscillator which comprises two stages that are coupled so that the input of one is derived from the output of the other [9] [13]. MULTIVIBRATOR MODULATOR—An astable multivibrator used to provide frequency modulation. The modulating af voltage is inserted in series with the base return of the multivibrator transistors to produce the frequency modulation [12]. MUTUAL FLUX—The total flux in the core of a transformer that is common to both the primary and secondary windings. The flux links both windings [2]. MUTUAL INDUCTANCE—A circuit property existing when the relative position of two inductors causes the magnetic lines of force from one to link with the turns of the other. The symbol for mutual inductance is M [2]. NAND—A logic function of A and B that is true if either A or B is false [13]. NAND CIRCUIT—A combination of a NOT function and an AND function in a binary circuit that has two or more inputs and one output. The output is logic 0 only if ALL inputs are logic 1; it is logic 1 if ANY input is logic 0 [13]. NATURAL FREQUENCY—See RESONANT FREQUENCY [9]. NATURAL HORIZON—The line-of-sight horizon [10]. NAUTICAL MILE—The length of a minute of arc of a great circle of the earth (6,076 ft) [18]. NAUTICAL RADAR MILE—See RADAR MILE [18]. NEAR SYNCHRONOUS ORBIT—An orbit in which the satellite rotates close to but not exactly at the same speed as the earth [17].